f3e7807f78d98781d903ea8075a970e18c881033
[linux-2.6.git] / drivers / char / synclinkmp.c
1 /*
2  * $Id: synclinkmp.c,v 4.38 2005/07/15 13:29:44 paulkf Exp $
3  *
4  * Device driver for Microgate SyncLink Multiport
5  * high speed multiprotocol serial adapter.
6  *
7  * written by Paul Fulghum for Microgate Corporation
8  * paulkf@microgate.com
9  *
10  * Microgate and SyncLink are trademarks of Microgate Corporation
11  *
12  * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
13  * This code is released under the GNU General Public License (GPL)
14  *
15  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
16  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
19  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
23  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
25  * OF THE POSSIBILITY OF SUCH DAMAGE.
26  */
27
28 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
29 #if defined(__i386__)
30 #  define BREAKPOINT() asm("   int $3");
31 #else
32 #  define BREAKPOINT() { }
33 #endif
34
35 #define MAX_DEVICES 12
36
37 #include <linux/module.h>
38 #include <linux/errno.h>
39 #include <linux/signal.h>
40 #include <linux/sched.h>
41 #include <linux/timer.h>
42 #include <linux/interrupt.h>
43 #include <linux/pci.h>
44 #include <linux/tty.h>
45 #include <linux/tty_flip.h>
46 #include <linux/serial.h>
47 #include <linux/major.h>
48 #include <linux/string.h>
49 #include <linux/fcntl.h>
50 #include <linux/ptrace.h>
51 #include <linux/ioport.h>
52 #include <linux/mm.h>
53 #include <linux/slab.h>
54 #include <linux/netdevice.h>
55 #include <linux/vmalloc.h>
56 #include <linux/init.h>
57 #include <linux/delay.h>
58 #include <linux/ioctl.h>
59
60 #include <asm/system.h>
61 #include <asm/io.h>
62 #include <asm/irq.h>
63 #include <asm/dma.h>
64 #include <linux/bitops.h>
65 #include <asm/types.h>
66 #include <linux/termios.h>
67 #include <linux/workqueue.h>
68 #include <linux/hdlc.h>
69 #include <linux/synclink.h>
70
71 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINKMP_MODULE))
72 #define SYNCLINK_GENERIC_HDLC 1
73 #else
74 #define SYNCLINK_GENERIC_HDLC 0
75 #endif
76
77 #define GET_USER(error,value,addr) error = get_user(value,addr)
78 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
79 #define PUT_USER(error,value,addr) error = put_user(value,addr)
80 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
81
82 #include <asm/uaccess.h>
83
84 static MGSL_PARAMS default_params = {
85         MGSL_MODE_HDLC,                 /* unsigned long mode */
86         0,                              /* unsigned char loopback; */
87         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
88         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
89         0,                              /* unsigned long clock_speed; */
90         0xff,                           /* unsigned char addr_filter; */
91         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
92         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
93         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
94         9600,                           /* unsigned long data_rate; */
95         8,                              /* unsigned char data_bits; */
96         1,                              /* unsigned char stop_bits; */
97         ASYNC_PARITY_NONE               /* unsigned char parity; */
98 };
99
100 /* size in bytes of DMA data buffers */
101 #define SCABUFSIZE      1024
102 #define SCA_MEM_SIZE    0x40000
103 #define SCA_BASE_SIZE   512
104 #define SCA_REG_SIZE    16
105 #define SCA_MAX_PORTS   4
106 #define SCAMAXDESC      128
107
108 #define BUFFERLISTSIZE  4096
109
110 /* SCA-I style DMA buffer descriptor */
111 typedef struct _SCADESC
112 {
113         u16     next;           /* lower l6 bits of next descriptor addr */
114         u16     buf_ptr;        /* lower 16 bits of buffer addr */
115         u8      buf_base;       /* upper 8 bits of buffer addr */
116         u8      pad1;
117         u16     length;         /* length of buffer */
118         u8      status;         /* status of buffer */
119         u8      pad2;
120 } SCADESC, *PSCADESC;
121
122 typedef struct _SCADESC_EX
123 {
124         /* device driver bookkeeping section */
125         char    *virt_addr;     /* virtual address of data buffer */
126         u16     phys_entry;     /* lower 16-bits of physical address of this descriptor */
127 } SCADESC_EX, *PSCADESC_EX;
128
129 /* The queue of BH actions to be performed */
130
131 #define BH_RECEIVE  1
132 #define BH_TRANSMIT 2
133 #define BH_STATUS   4
134
135 #define IO_PIN_SHUTDOWN_LIMIT 100
136
137 struct  _input_signal_events {
138         int     ri_up;
139         int     ri_down;
140         int     dsr_up;
141         int     dsr_down;
142         int     dcd_up;
143         int     dcd_down;
144         int     cts_up;
145         int     cts_down;
146 };
147
148 /*
149  * Device instance data structure
150  */
151 typedef struct _synclinkmp_info {
152         void *if_ptr;                           /* General purpose pointer (used by SPPP) */
153         int                     magic;
154         int                     flags;
155         int                     count;          /* count of opens */
156         int                     line;
157         unsigned short          close_delay;
158         unsigned short          closing_wait;   /* time to wait before closing */
159
160         struct mgsl_icount      icount;
161
162         struct tty_struct       *tty;
163         int                     timeout;
164         int                     x_char;         /* xon/xoff character */
165         int                     blocked_open;   /* # of blocked opens */
166         u16                     read_status_mask1;  /* break detection (SR1 indications) */
167         u16                     read_status_mask2;  /* parity/framing/overun (SR2 indications) */
168         unsigned char           ignore_status_mask1;  /* break detection (SR1 indications) */
169         unsigned char           ignore_status_mask2;  /* parity/framing/overun (SR2 indications) */
170         unsigned char           *tx_buf;
171         int                     tx_put;
172         int                     tx_get;
173         int                     tx_count;
174
175         wait_queue_head_t       open_wait;
176         wait_queue_head_t       close_wait;
177
178         wait_queue_head_t       status_event_wait_q;
179         wait_queue_head_t       event_wait_q;
180         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
181         struct _synclinkmp_info *next_device;   /* device list link */
182         struct timer_list       status_timer;   /* input signal status check timer */
183
184         spinlock_t lock;                /* spinlock for synchronizing with ISR */
185         struct work_struct task;                        /* task structure for scheduling bh */
186
187         u32 max_frame_size;                     /* as set by device config */
188
189         u32 pending_bh;
190
191         int bh_running;                         /* Protection from multiple */
192         int isr_overflow;
193         int bh_requested;
194
195         int dcd_chkcount;                       /* check counts to prevent */
196         int cts_chkcount;                       /* too many IRQs if a signal */
197         int dsr_chkcount;                       /* is floating */
198         int ri_chkcount;
199
200         char *buffer_list;                      /* virtual address of Rx & Tx buffer lists */
201         unsigned long buffer_list_phys;
202
203         unsigned int rx_buf_count;              /* count of total allocated Rx buffers */
204         SCADESC *rx_buf_list;                   /* list of receive buffer entries */
205         SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
206         unsigned int current_rx_buf;
207
208         unsigned int tx_buf_count;              /* count of total allocated Tx buffers */
209         SCADESC *tx_buf_list;           /* list of transmit buffer entries */
210         SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
211         unsigned int last_tx_buf;
212
213         unsigned char *tmp_rx_buf;
214         unsigned int tmp_rx_buf_count;
215
216         int rx_enabled;
217         int rx_overflow;
218
219         int tx_enabled;
220         int tx_active;
221         u32 idle_mode;
222
223         unsigned char ie0_value;
224         unsigned char ie1_value;
225         unsigned char ie2_value;
226         unsigned char ctrlreg_value;
227         unsigned char old_signals;
228
229         char device_name[25];                   /* device instance name */
230
231         int port_count;
232         int adapter_num;
233         int port_num;
234
235         struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
236
237         unsigned int bus_type;                  /* expansion bus type (ISA,EISA,PCI) */
238
239         unsigned int irq_level;                 /* interrupt level */
240         unsigned long irq_flags;
241         int irq_requested;                      /* nonzero if IRQ requested */
242
243         MGSL_PARAMS params;                     /* communications parameters */
244
245         unsigned char serial_signals;           /* current serial signal states */
246
247         int irq_occurred;                       /* for diagnostics use */
248         unsigned int init_error;                /* Initialization startup error */
249
250         u32 last_mem_alloc;
251         unsigned char* memory_base;             /* shared memory address (PCI only) */
252         u32 phys_memory_base;
253         int shared_mem_requested;
254
255         unsigned char* sca_base;                /* HD64570 SCA Memory address */
256         u32 phys_sca_base;
257         u32 sca_offset;
258         int sca_base_requested;
259
260         unsigned char* lcr_base;                /* local config registers (PCI only) */
261         u32 phys_lcr_base;
262         u32 lcr_offset;
263         int lcr_mem_requested;
264
265         unsigned char* statctrl_base;           /* status/control register memory */
266         u32 phys_statctrl_base;
267         u32 statctrl_offset;
268         int sca_statctrl_requested;
269
270         u32 misc_ctrl_value;
271         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
272         char char_buf[MAX_ASYNC_BUFFER_SIZE];
273         BOOLEAN drop_rts_on_tx_done;
274
275         struct  _input_signal_events    input_signal_events;
276
277         /* SPPP/Cisco HDLC device parts */
278         int netcount;
279         int dosyncppp;
280         spinlock_t netlock;
281
282 #if SYNCLINK_GENERIC_HDLC
283         struct net_device *netdev;
284 #endif
285
286 } SLMP_INFO;
287
288 #define MGSL_MAGIC 0x5401
289
290 /*
291  * define serial signal status change macros
292  */
293 #define MISCSTATUS_DCD_LATCHED  (SerialSignal_DCD<<8)   /* indicates change in DCD */
294 #define MISCSTATUS_RI_LATCHED   (SerialSignal_RI<<8)    /* indicates change in RI */
295 #define MISCSTATUS_CTS_LATCHED  (SerialSignal_CTS<<8)   /* indicates change in CTS */
296 #define MISCSTATUS_DSR_LATCHED  (SerialSignal_DSR<<8)   /* change in DSR */
297
298 /* Common Register macros */
299 #define LPR     0x00
300 #define PABR0   0x02
301 #define PABR1   0x03
302 #define WCRL    0x04
303 #define WCRM    0x05
304 #define WCRH    0x06
305 #define DPCR    0x08
306 #define DMER    0x09
307 #define ISR0    0x10
308 #define ISR1    0x11
309 #define ISR2    0x12
310 #define IER0    0x14
311 #define IER1    0x15
312 #define IER2    0x16
313 #define ITCR    0x18
314 #define INTVR   0x1a
315 #define IMVR    0x1c
316
317 /* MSCI Register macros */
318 #define TRB     0x20
319 #define TRBL    0x20
320 #define TRBH    0x21
321 #define SR0     0x22
322 #define SR1     0x23
323 #define SR2     0x24
324 #define SR3     0x25
325 #define FST     0x26
326 #define IE0     0x28
327 #define IE1     0x29
328 #define IE2     0x2a
329 #define FIE     0x2b
330 #define CMD     0x2c
331 #define MD0     0x2e
332 #define MD1     0x2f
333 #define MD2     0x30
334 #define CTL     0x31
335 #define SA0     0x32
336 #define SA1     0x33
337 #define IDL     0x34
338 #define TMC     0x35
339 #define RXS     0x36
340 #define TXS     0x37
341 #define TRC0    0x38
342 #define TRC1    0x39
343 #define RRC     0x3a
344 #define CST0    0x3c
345 #define CST1    0x3d
346
347 /* Timer Register Macros */
348 #define TCNT    0x60
349 #define TCNTL   0x60
350 #define TCNTH   0x61
351 #define TCONR   0x62
352 #define TCONRL  0x62
353 #define TCONRH  0x63
354 #define TMCS    0x64
355 #define TEPR    0x65
356
357 /* DMA Controller Register macros */
358 #define DARL    0x80
359 #define DARH    0x81
360 #define DARB    0x82
361 #define BAR     0x80
362 #define BARL    0x80
363 #define BARH    0x81
364 #define BARB    0x82
365 #define SAR     0x84
366 #define SARL    0x84
367 #define SARH    0x85
368 #define SARB    0x86
369 #define CPB     0x86
370 #define CDA     0x88
371 #define CDAL    0x88
372 #define CDAH    0x89
373 #define EDA     0x8a
374 #define EDAL    0x8a
375 #define EDAH    0x8b
376 #define BFL     0x8c
377 #define BFLL    0x8c
378 #define BFLH    0x8d
379 #define BCR     0x8e
380 #define BCRL    0x8e
381 #define BCRH    0x8f
382 #define DSR     0x90
383 #define DMR     0x91
384 #define FCT     0x93
385 #define DIR     0x94
386 #define DCMD    0x95
387
388 /* combine with timer or DMA register address */
389 #define TIMER0  0x00
390 #define TIMER1  0x08
391 #define TIMER2  0x10
392 #define TIMER3  0x18
393 #define RXDMA   0x00
394 #define TXDMA   0x20
395
396 /* SCA Command Codes */
397 #define NOOP            0x00
398 #define TXRESET         0x01
399 #define TXENABLE        0x02
400 #define TXDISABLE       0x03
401 #define TXCRCINIT       0x04
402 #define TXCRCEXCL       0x05
403 #define TXEOM           0x06
404 #define TXABORT         0x07
405 #define MPON            0x08
406 #define TXBUFCLR        0x09
407 #define RXRESET         0x11
408 #define RXENABLE        0x12
409 #define RXDISABLE       0x13
410 #define RXCRCINIT       0x14
411 #define RXREJECT        0x15
412 #define SEARCHMP        0x16
413 #define RXCRCEXCL       0x17
414 #define RXCRCCALC       0x18
415 #define CHRESET         0x21
416 #define HUNT            0x31
417
418 /* DMA command codes */
419 #define SWABORT         0x01
420 #define FEICLEAR        0x02
421
422 /* IE0 */
423 #define TXINTE          BIT7
424 #define RXINTE          BIT6
425 #define TXRDYE          BIT1
426 #define RXRDYE          BIT0
427
428 /* IE1 & SR1 */
429 #define UDRN    BIT7
430 #define IDLE    BIT6
431 #define SYNCD   BIT4
432 #define FLGD    BIT4
433 #define CCTS    BIT3
434 #define CDCD    BIT2
435 #define BRKD    BIT1
436 #define ABTD    BIT1
437 #define GAPD    BIT1
438 #define BRKE    BIT0
439 #define IDLD    BIT0
440
441 /* IE2 & SR2 */
442 #define EOM     BIT7
443 #define PMP     BIT6
444 #define SHRT    BIT6
445 #define PE      BIT5
446 #define ABT     BIT5
447 #define FRME    BIT4
448 #define RBIT    BIT4
449 #define OVRN    BIT3
450 #define CRCE    BIT2
451
452
453 /*
454  * Global linked list of SyncLink devices
455  */
456 static SLMP_INFO *synclinkmp_device_list = NULL;
457 static int synclinkmp_adapter_count = -1;
458 static int synclinkmp_device_count = 0;
459
460 /*
461  * Set this param to non-zero to load eax with the
462  * .text section address and breakpoint on module load.
463  * This is useful for use with gdb and add-symbol-file command.
464  */
465 static int break_on_load=0;
466
467 /*
468  * Driver major number, defaults to zero to get auto
469  * assigned major number. May be forced as module parameter.
470  */
471 static int ttymajor=0;
472
473 /*
474  * Array of user specified options for ISA adapters.
475  */
476 static int debug_level = 0;
477 static int maxframe[MAX_DEVICES] = {0,};
478 static int dosyncppp[MAX_DEVICES] = {0,};
479
480 module_param(break_on_load, bool, 0);
481 module_param(ttymajor, int, 0);
482 module_param(debug_level, int, 0);
483 module_param_array(maxframe, int, NULL, 0);
484 module_param_array(dosyncppp, int, NULL, 0);
485
486 static char *driver_name = "SyncLink MultiPort driver";
487 static char *driver_version = "$Revision: 4.38 $";
488
489 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
490 static void synclinkmp_remove_one(struct pci_dev *dev);
491
492 static struct pci_device_id synclinkmp_pci_tbl[] = {
493         { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
494         { 0, }, /* terminate list */
495 };
496 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
497
498 MODULE_LICENSE("GPL");
499
500 static struct pci_driver synclinkmp_pci_driver = {
501         .name           = "synclinkmp",
502         .id_table       = synclinkmp_pci_tbl,
503         .probe          = synclinkmp_init_one,
504         .remove         = __devexit_p(synclinkmp_remove_one),
505 };
506
507
508 static struct tty_driver *serial_driver;
509
510 /* number of characters left in xmit buffer before we ask for more */
511 #define WAKEUP_CHARS 256
512
513
514 /* tty callbacks */
515
516 static int  open(struct tty_struct *tty, struct file * filp);
517 static void close(struct tty_struct *tty, struct file * filp);
518 static void hangup(struct tty_struct *tty);
519 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
520
521 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
522 static void put_char(struct tty_struct *tty, unsigned char ch);
523 static void send_xchar(struct tty_struct *tty, char ch);
524 static void wait_until_sent(struct tty_struct *tty, int timeout);
525 static int  write_room(struct tty_struct *tty);
526 static void flush_chars(struct tty_struct *tty);
527 static void flush_buffer(struct tty_struct *tty);
528 static void tx_hold(struct tty_struct *tty);
529 static void tx_release(struct tty_struct *tty);
530
531 static int  ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
532 static int  read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
533 static int  chars_in_buffer(struct tty_struct *tty);
534 static void throttle(struct tty_struct * tty);
535 static void unthrottle(struct tty_struct * tty);
536 static void set_break(struct tty_struct *tty, int break_state);
537
538 #if SYNCLINK_GENERIC_HDLC
539 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
540 static void hdlcdev_tx_done(SLMP_INFO *info);
541 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
542 static int  hdlcdev_init(SLMP_INFO *info);
543 static void hdlcdev_exit(SLMP_INFO *info);
544 #endif
545
546 /* ioctl handlers */
547
548 static int  get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
549 static int  get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
550 static int  set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
551 static int  get_txidle(SLMP_INFO *info, int __user *idle_mode);
552 static int  set_txidle(SLMP_INFO *info, int idle_mode);
553 static int  tx_enable(SLMP_INFO *info, int enable);
554 static int  tx_abort(SLMP_INFO *info);
555 static int  rx_enable(SLMP_INFO *info, int enable);
556 static int  modem_input_wait(SLMP_INFO *info,int arg);
557 static int  wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
558 static int  tiocmget(struct tty_struct *tty, struct file *file);
559 static int  tiocmset(struct tty_struct *tty, struct file *file,
560                      unsigned int set, unsigned int clear);
561 static void set_break(struct tty_struct *tty, int break_state);
562
563 static void add_device(SLMP_INFO *info);
564 static void device_init(int adapter_num, struct pci_dev *pdev);
565 static int  claim_resources(SLMP_INFO *info);
566 static void release_resources(SLMP_INFO *info);
567
568 static int  startup(SLMP_INFO *info);
569 static int  block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
570 static void shutdown(SLMP_INFO *info);
571 static void program_hw(SLMP_INFO *info);
572 static void change_params(SLMP_INFO *info);
573
574 static int  init_adapter(SLMP_INFO *info);
575 static int  register_test(SLMP_INFO *info);
576 static int  irq_test(SLMP_INFO *info);
577 static int  loopback_test(SLMP_INFO *info);
578 static int  adapter_test(SLMP_INFO *info);
579 static int  memory_test(SLMP_INFO *info);
580
581 static void reset_adapter(SLMP_INFO *info);
582 static void reset_port(SLMP_INFO *info);
583 static void async_mode(SLMP_INFO *info);
584 static void hdlc_mode(SLMP_INFO *info);
585
586 static void rx_stop(SLMP_INFO *info);
587 static void rx_start(SLMP_INFO *info);
588 static void rx_reset_buffers(SLMP_INFO *info);
589 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
590 static int  rx_get_frame(SLMP_INFO *info);
591
592 static void tx_start(SLMP_INFO *info);
593 static void tx_stop(SLMP_INFO *info);
594 static void tx_load_fifo(SLMP_INFO *info);
595 static void tx_set_idle(SLMP_INFO *info);
596 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
597
598 static void get_signals(SLMP_INFO *info);
599 static void set_signals(SLMP_INFO *info);
600 static void enable_loopback(SLMP_INFO *info, int enable);
601 static void set_rate(SLMP_INFO *info, u32 data_rate);
602
603 static int  bh_action(SLMP_INFO *info);
604 static void bh_handler(struct work_struct *work);
605 static void bh_receive(SLMP_INFO *info);
606 static void bh_transmit(SLMP_INFO *info);
607 static void bh_status(SLMP_INFO *info);
608 static void isr_timer(SLMP_INFO *info);
609 static void isr_rxint(SLMP_INFO *info);
610 static void isr_rxrdy(SLMP_INFO *info);
611 static void isr_txint(SLMP_INFO *info);
612 static void isr_txrdy(SLMP_INFO *info);
613 static void isr_rxdmaok(SLMP_INFO *info);
614 static void isr_rxdmaerror(SLMP_INFO *info);
615 static void isr_txdmaok(SLMP_INFO *info);
616 static void isr_txdmaerror(SLMP_INFO *info);
617 static void isr_io_pin(SLMP_INFO *info, u16 status);
618
619 static int  alloc_dma_bufs(SLMP_INFO *info);
620 static void free_dma_bufs(SLMP_INFO *info);
621 static int  alloc_buf_list(SLMP_INFO *info);
622 static int  alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
623 static int  alloc_tmp_rx_buf(SLMP_INFO *info);
624 static void free_tmp_rx_buf(SLMP_INFO *info);
625
626 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
627 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
628 static void tx_timeout(unsigned long context);
629 static void status_timeout(unsigned long context);
630
631 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
632 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
633 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
634 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
635 static unsigned char read_status_reg(SLMP_INFO * info);
636 static void write_control_reg(SLMP_INFO * info);
637
638
639 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
640 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
641 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
642
643 static u32 misc_ctrl_value = 0x007e4040;
644 static u32 lcr1_brdr_value = 0x00800028;
645
646 static u32 read_ahead_count = 8;
647
648 /* DPCR, DMA Priority Control
649  *
650  * 07..05  Not used, must be 0
651  * 04      BRC, bus release condition: 0=all transfers complete
652  *              1=release after 1 xfer on all channels
653  * 03      CCC, channel change condition: 0=every cycle
654  *              1=after each channel completes all xfers
655  * 02..00  PR<2..0>, priority 100=round robin
656  *
657  * 00000100 = 0x00
658  */
659 static unsigned char dma_priority = 0x04;
660
661 // Number of bytes that can be written to shared RAM
662 // in a single write operation
663 static u32 sca_pci_load_interval = 64;
664
665 /*
666  * 1st function defined in .text section. Calling this function in
667  * init_module() followed by a breakpoint allows a remote debugger
668  * (gdb) to get the .text address for the add-symbol-file command.
669  * This allows remote debugging of dynamically loadable modules.
670  */
671 static void* synclinkmp_get_text_ptr(void);
672 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
673
674 static inline int sanity_check(SLMP_INFO *info,
675                                char *name, const char *routine)
676 {
677 #ifdef SANITY_CHECK
678         static const char *badmagic =
679                 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
680         static const char *badinfo =
681                 "Warning: null synclinkmp_struct for (%s) in %s\n";
682
683         if (!info) {
684                 printk(badinfo, name, routine);
685                 return 1;
686         }
687         if (info->magic != MGSL_MAGIC) {
688                 printk(badmagic, name, routine);
689                 return 1;
690         }
691 #else
692         if (!info)
693                 return 1;
694 #endif
695         return 0;
696 }
697
698 /**
699  * line discipline callback wrappers
700  *
701  * The wrappers maintain line discipline references
702  * while calling into the line discipline.
703  *
704  * ldisc_receive_buf  - pass receive data to line discipline
705  */
706
707 static void ldisc_receive_buf(struct tty_struct *tty,
708                               const __u8 *data, char *flags, int count)
709 {
710         struct tty_ldisc *ld;
711         if (!tty)
712                 return;
713         ld = tty_ldisc_ref(tty);
714         if (ld) {
715                 if (ld->receive_buf)
716                         ld->receive_buf(tty, data, flags, count);
717                 tty_ldisc_deref(ld);
718         }
719 }
720
721 /* tty callbacks */
722
723 /* Called when a port is opened.  Init and enable port.
724  */
725 static int open(struct tty_struct *tty, struct file *filp)
726 {
727         SLMP_INFO *info;
728         int retval, line;
729         unsigned long flags;
730
731         line = tty->index;
732         if ((line < 0) || (line >= synclinkmp_device_count)) {
733                 printk("%s(%d): open with invalid line #%d.\n",
734                         __FILE__,__LINE__,line);
735                 return -ENODEV;
736         }
737
738         info = synclinkmp_device_list;
739         while(info && info->line != line)
740                 info = info->next_device;
741         if (sanity_check(info, tty->name, "open"))
742                 return -ENODEV;
743         if ( info->init_error ) {
744                 printk("%s(%d):%s device is not allocated, init error=%d\n",
745                         __FILE__,__LINE__,info->device_name,info->init_error);
746                 return -ENODEV;
747         }
748
749         tty->driver_data = info;
750         info->tty = tty;
751
752         if (debug_level >= DEBUG_LEVEL_INFO)
753                 printk("%s(%d):%s open(), old ref count = %d\n",
754                          __FILE__,__LINE__,tty->driver->name, info->count);
755
756         /* If port is closing, signal caller to try again */
757         if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
758                 if (info->flags & ASYNC_CLOSING)
759                         interruptible_sleep_on(&info->close_wait);
760                 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
761                         -EAGAIN : -ERESTARTSYS);
762                 goto cleanup;
763         }
764
765         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
766
767         spin_lock_irqsave(&info->netlock, flags);
768         if (info->netcount) {
769                 retval = -EBUSY;
770                 spin_unlock_irqrestore(&info->netlock, flags);
771                 goto cleanup;
772         }
773         info->count++;
774         spin_unlock_irqrestore(&info->netlock, flags);
775
776         if (info->count == 1) {
777                 /* 1st open on this device, init hardware */
778                 retval = startup(info);
779                 if (retval < 0)
780                         goto cleanup;
781         }
782
783         retval = block_til_ready(tty, filp, info);
784         if (retval) {
785                 if (debug_level >= DEBUG_LEVEL_INFO)
786                         printk("%s(%d):%s block_til_ready() returned %d\n",
787                                  __FILE__,__LINE__, info->device_name, retval);
788                 goto cleanup;
789         }
790
791         if (debug_level >= DEBUG_LEVEL_INFO)
792                 printk("%s(%d):%s open() success\n",
793                          __FILE__,__LINE__, info->device_name);
794         retval = 0;
795
796 cleanup:
797         if (retval) {
798                 if (tty->count == 1)
799                         info->tty = NULL; /* tty layer will release tty struct */
800                 if(info->count)
801                         info->count--;
802         }
803
804         return retval;
805 }
806
807 /* Called when port is closed. Wait for remaining data to be
808  * sent. Disable port and free resources.
809  */
810 static void close(struct tty_struct *tty, struct file *filp)
811 {
812         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
813
814         if (sanity_check(info, tty->name, "close"))
815                 return;
816
817         if (debug_level >= DEBUG_LEVEL_INFO)
818                 printk("%s(%d):%s close() entry, count=%d\n",
819                          __FILE__,__LINE__, info->device_name, info->count);
820
821         if (!info->count)
822                 return;
823
824         if (tty_hung_up_p(filp))
825                 goto cleanup;
826
827         if ((tty->count == 1) && (info->count != 1)) {
828                 /*
829                  * tty->count is 1 and the tty structure will be freed.
830                  * info->count should be one in this case.
831                  * if it's not, correct it so that the port is shutdown.
832                  */
833                 printk("%s(%d):%s close: bad refcount; tty->count is 1, "
834                        "info->count is %d\n",
835                          __FILE__,__LINE__, info->device_name, info->count);
836                 info->count = 1;
837         }
838
839         info->count--;
840
841         /* if at least one open remaining, leave hardware active */
842         if (info->count)
843                 goto cleanup;
844
845         info->flags |= ASYNC_CLOSING;
846
847         /* set tty->closing to notify line discipline to
848          * only process XON/XOFF characters. Only the N_TTY
849          * discipline appears to use this (ppp does not).
850          */
851         tty->closing = 1;
852
853         /* wait for transmit data to clear all layers */
854
855         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
856                 if (debug_level >= DEBUG_LEVEL_INFO)
857                         printk("%s(%d):%s close() calling tty_wait_until_sent\n",
858                                  __FILE__,__LINE__, info->device_name );
859                 tty_wait_until_sent(tty, info->closing_wait);
860         }
861
862         if (info->flags & ASYNC_INITIALIZED)
863                 wait_until_sent(tty, info->timeout);
864
865         if (tty->driver->flush_buffer)
866                 tty->driver->flush_buffer(tty);
867
868         tty_ldisc_flush(tty);
869
870         shutdown(info);
871
872         tty->closing = 0;
873         info->tty = NULL;
874
875         if (info->blocked_open) {
876                 if (info->close_delay) {
877                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
878                 }
879                 wake_up_interruptible(&info->open_wait);
880         }
881
882         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
883
884         wake_up_interruptible(&info->close_wait);
885
886 cleanup:
887         if (debug_level >= DEBUG_LEVEL_INFO)
888                 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
889                         tty->driver->name, info->count);
890 }
891
892 /* Called by tty_hangup() when a hangup is signaled.
893  * This is the same as closing all open descriptors for the port.
894  */
895 static void hangup(struct tty_struct *tty)
896 {
897         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
898
899         if (debug_level >= DEBUG_LEVEL_INFO)
900                 printk("%s(%d):%s hangup()\n",
901                          __FILE__,__LINE__, info->device_name );
902
903         if (sanity_check(info, tty->name, "hangup"))
904                 return;
905
906         flush_buffer(tty);
907         shutdown(info);
908
909         info->count = 0;
910         info->flags &= ~ASYNC_NORMAL_ACTIVE;
911         info->tty = NULL;
912
913         wake_up_interruptible(&info->open_wait);
914 }
915
916 /* Set new termios settings
917  */
918 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
919 {
920         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
921         unsigned long flags;
922
923         if (debug_level >= DEBUG_LEVEL_INFO)
924                 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
925                         tty->driver->name );
926
927         change_params(info);
928
929         /* Handle transition to B0 status */
930         if (old_termios->c_cflag & CBAUD &&
931             !(tty->termios->c_cflag & CBAUD)) {
932                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
933                 spin_lock_irqsave(&info->lock,flags);
934                 set_signals(info);
935                 spin_unlock_irqrestore(&info->lock,flags);
936         }
937
938         /* Handle transition away from B0 status */
939         if (!(old_termios->c_cflag & CBAUD) &&
940             tty->termios->c_cflag & CBAUD) {
941                 info->serial_signals |= SerialSignal_DTR;
942                 if (!(tty->termios->c_cflag & CRTSCTS) ||
943                     !test_bit(TTY_THROTTLED, &tty->flags)) {
944                         info->serial_signals |= SerialSignal_RTS;
945                 }
946                 spin_lock_irqsave(&info->lock,flags);
947                 set_signals(info);
948                 spin_unlock_irqrestore(&info->lock,flags);
949         }
950
951         /* Handle turning off CRTSCTS */
952         if (old_termios->c_cflag & CRTSCTS &&
953             !(tty->termios->c_cflag & CRTSCTS)) {
954                 tty->hw_stopped = 0;
955                 tx_release(tty);
956         }
957 }
958
959 /* Send a block of data
960  *
961  * Arguments:
962  *
963  *      tty             pointer to tty information structure
964  *      buf             pointer to buffer containing send data
965  *      count           size of send data in bytes
966  *
967  * Return Value:        number of characters written
968  */
969 static int write(struct tty_struct *tty,
970                  const unsigned char *buf, int count)
971 {
972         int     c, ret = 0;
973         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
974         unsigned long flags;
975
976         if (debug_level >= DEBUG_LEVEL_INFO)
977                 printk("%s(%d):%s write() count=%d\n",
978                        __FILE__,__LINE__,info->device_name,count);
979
980         if (sanity_check(info, tty->name, "write"))
981                 goto cleanup;
982
983         if (!info->tx_buf)
984                 goto cleanup;
985
986         if (info->params.mode == MGSL_MODE_HDLC) {
987                 if (count > info->max_frame_size) {
988                         ret = -EIO;
989                         goto cleanup;
990                 }
991                 if (info->tx_active)
992                         goto cleanup;
993                 if (info->tx_count) {
994                         /* send accumulated data from send_char() calls */
995                         /* as frame and wait before accepting more data. */
996                         tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
997                         goto start;
998                 }
999                 ret = info->tx_count = count;
1000                 tx_load_dma_buffer(info, buf, count);
1001                 goto start;
1002         }
1003
1004         for (;;) {
1005                 c = min_t(int, count,
1006                         min(info->max_frame_size - info->tx_count - 1,
1007                             info->max_frame_size - info->tx_put));
1008                 if (c <= 0)
1009                         break;
1010                         
1011                 memcpy(info->tx_buf + info->tx_put, buf, c);
1012
1013                 spin_lock_irqsave(&info->lock,flags);
1014                 info->tx_put += c;
1015                 if (info->tx_put >= info->max_frame_size)
1016                         info->tx_put -= info->max_frame_size;
1017                 info->tx_count += c;
1018                 spin_unlock_irqrestore(&info->lock,flags);
1019
1020                 buf += c;
1021                 count -= c;
1022                 ret += c;
1023         }
1024
1025         if (info->params.mode == MGSL_MODE_HDLC) {
1026                 if (count) {
1027                         ret = info->tx_count = 0;
1028                         goto cleanup;
1029                 }
1030                 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
1031         }
1032 start:
1033         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1034                 spin_lock_irqsave(&info->lock,flags);
1035                 if (!info->tx_active)
1036                         tx_start(info);
1037                 spin_unlock_irqrestore(&info->lock,flags);
1038         }
1039
1040 cleanup:
1041         if (debug_level >= DEBUG_LEVEL_INFO)
1042                 printk( "%s(%d):%s write() returning=%d\n",
1043                         __FILE__,__LINE__,info->device_name,ret);
1044         return ret;
1045 }
1046
1047 /* Add a character to the transmit buffer.
1048  */
1049 static void put_char(struct tty_struct *tty, unsigned char ch)
1050 {
1051         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1052         unsigned long flags;
1053
1054         if ( debug_level >= DEBUG_LEVEL_INFO ) {
1055                 printk( "%s(%d):%s put_char(%d)\n",
1056                         __FILE__,__LINE__,info->device_name,ch);
1057         }
1058
1059         if (sanity_check(info, tty->name, "put_char"))
1060                 return;
1061
1062         if (!info->tx_buf)
1063                 return;
1064
1065         spin_lock_irqsave(&info->lock,flags);
1066
1067         if ( (info->params.mode != MGSL_MODE_HDLC) ||
1068              !info->tx_active ) {
1069
1070                 if (info->tx_count < info->max_frame_size - 1) {
1071                         info->tx_buf[info->tx_put++] = ch;
1072                         if (info->tx_put >= info->max_frame_size)
1073                                 info->tx_put -= info->max_frame_size;
1074                         info->tx_count++;
1075                 }
1076         }
1077
1078         spin_unlock_irqrestore(&info->lock,flags);
1079 }
1080
1081 /* Send a high-priority XON/XOFF character
1082  */
1083 static void send_xchar(struct tty_struct *tty, char ch)
1084 {
1085         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1086         unsigned long flags;
1087
1088         if (debug_level >= DEBUG_LEVEL_INFO)
1089                 printk("%s(%d):%s send_xchar(%d)\n",
1090                          __FILE__,__LINE__, info->device_name, ch );
1091
1092         if (sanity_check(info, tty->name, "send_xchar"))
1093                 return;
1094
1095         info->x_char = ch;
1096         if (ch) {
1097                 /* Make sure transmit interrupts are on */
1098                 spin_lock_irqsave(&info->lock,flags);
1099                 if (!info->tx_enabled)
1100                         tx_start(info);
1101                 spin_unlock_irqrestore(&info->lock,flags);
1102         }
1103 }
1104
1105 /* Wait until the transmitter is empty.
1106  */
1107 static void wait_until_sent(struct tty_struct *tty, int timeout)
1108 {
1109         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1110         unsigned long orig_jiffies, char_time;
1111
1112         if (!info )
1113                 return;
1114
1115         if (debug_level >= DEBUG_LEVEL_INFO)
1116                 printk("%s(%d):%s wait_until_sent() entry\n",
1117                          __FILE__,__LINE__, info->device_name );
1118
1119         if (sanity_check(info, tty->name, "wait_until_sent"))
1120                 return;
1121
1122         if (!(info->flags & ASYNC_INITIALIZED))
1123                 goto exit;
1124
1125         orig_jiffies = jiffies;
1126
1127         /* Set check interval to 1/5 of estimated time to
1128          * send a character, and make it at least 1. The check
1129          * interval should also be less than the timeout.
1130          * Note: use tight timings here to satisfy the NIST-PCTS.
1131          */
1132
1133         if ( info->params.data_rate ) {
1134                 char_time = info->timeout/(32 * 5);
1135                 if (!char_time)
1136                         char_time++;
1137         } else
1138                 char_time = 1;
1139
1140         if (timeout)
1141                 char_time = min_t(unsigned long, char_time, timeout);
1142
1143         if ( info->params.mode == MGSL_MODE_HDLC ) {
1144                 while (info->tx_active) {
1145                         msleep_interruptible(jiffies_to_msecs(char_time));
1146                         if (signal_pending(current))
1147                                 break;
1148                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1149                                 break;
1150                 }
1151         } else {
1152                 //TODO: determine if there is something similar to USC16C32
1153                 //      TXSTATUS_ALL_SENT status
1154                 while ( info->tx_active && info->tx_enabled) {
1155                         msleep_interruptible(jiffies_to_msecs(char_time));
1156                         if (signal_pending(current))
1157                                 break;
1158                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1159                                 break;
1160                 }
1161         }
1162
1163 exit:
1164         if (debug_level >= DEBUG_LEVEL_INFO)
1165                 printk("%s(%d):%s wait_until_sent() exit\n",
1166                          __FILE__,__LINE__, info->device_name );
1167 }
1168
1169 /* Return the count of free bytes in transmit buffer
1170  */
1171 static int write_room(struct tty_struct *tty)
1172 {
1173         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1174         int ret;
1175
1176         if (sanity_check(info, tty->name, "write_room"))
1177                 return 0;
1178
1179         if (info->params.mode == MGSL_MODE_HDLC) {
1180                 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1181         } else {
1182                 ret = info->max_frame_size - info->tx_count - 1;
1183                 if (ret < 0)
1184                         ret = 0;
1185         }
1186
1187         if (debug_level >= DEBUG_LEVEL_INFO)
1188                 printk("%s(%d):%s write_room()=%d\n",
1189                        __FILE__, __LINE__, info->device_name, ret);
1190
1191         return ret;
1192 }
1193
1194 /* enable transmitter and send remaining buffered characters
1195  */
1196 static void flush_chars(struct tty_struct *tty)
1197 {
1198         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1199         unsigned long flags;
1200
1201         if ( debug_level >= DEBUG_LEVEL_INFO )
1202                 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1203                         __FILE__,__LINE__,info->device_name,info->tx_count);
1204
1205         if (sanity_check(info, tty->name, "flush_chars"))
1206                 return;
1207
1208         if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1209             !info->tx_buf)
1210                 return;
1211
1212         if ( debug_level >= DEBUG_LEVEL_INFO )
1213                 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1214                         __FILE__,__LINE__,info->device_name );
1215
1216         spin_lock_irqsave(&info->lock,flags);
1217
1218         if (!info->tx_active) {
1219                 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1220                         info->tx_count ) {
1221                         /* operating in synchronous (frame oriented) mode */
1222                         /* copy data from circular tx_buf to */
1223                         /* transmit DMA buffer. */
1224                         tx_load_dma_buffer(info,
1225                                  info->tx_buf,info->tx_count);
1226                 }
1227                 tx_start(info);
1228         }
1229
1230         spin_unlock_irqrestore(&info->lock,flags);
1231 }
1232
1233 /* Discard all data in the send buffer
1234  */
1235 static void flush_buffer(struct tty_struct *tty)
1236 {
1237         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1238         unsigned long flags;
1239
1240         if (debug_level >= DEBUG_LEVEL_INFO)
1241                 printk("%s(%d):%s flush_buffer() entry\n",
1242                          __FILE__,__LINE__, info->device_name );
1243
1244         if (sanity_check(info, tty->name, "flush_buffer"))
1245                 return;
1246
1247         spin_lock_irqsave(&info->lock,flags);
1248         info->tx_count = info->tx_put = info->tx_get = 0;
1249         del_timer(&info->tx_timer);
1250         spin_unlock_irqrestore(&info->lock,flags);
1251
1252         tty_wakeup(tty);
1253 }
1254
1255 /* throttle (stop) transmitter
1256  */
1257 static void tx_hold(struct tty_struct *tty)
1258 {
1259         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1260         unsigned long flags;
1261
1262         if (sanity_check(info, tty->name, "tx_hold"))
1263                 return;
1264
1265         if ( debug_level >= DEBUG_LEVEL_INFO )
1266                 printk("%s(%d):%s tx_hold()\n",
1267                         __FILE__,__LINE__,info->device_name);
1268
1269         spin_lock_irqsave(&info->lock,flags);
1270         if (info->tx_enabled)
1271                 tx_stop(info);
1272         spin_unlock_irqrestore(&info->lock,flags);
1273 }
1274
1275 /* release (start) transmitter
1276  */
1277 static void tx_release(struct tty_struct *tty)
1278 {
1279         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1280         unsigned long flags;
1281
1282         if (sanity_check(info, tty->name, "tx_release"))
1283                 return;
1284
1285         if ( debug_level >= DEBUG_LEVEL_INFO )
1286                 printk("%s(%d):%s tx_release()\n",
1287                         __FILE__,__LINE__,info->device_name);
1288
1289         spin_lock_irqsave(&info->lock,flags);
1290         if (!info->tx_enabled)
1291                 tx_start(info);
1292         spin_unlock_irqrestore(&info->lock,flags);
1293 }
1294
1295 /* Service an IOCTL request
1296  *
1297  * Arguments:
1298  *
1299  *      tty     pointer to tty instance data
1300  *      file    pointer to associated file object for device
1301  *      cmd     IOCTL command code
1302  *      arg     command argument/context
1303  *
1304  * Return Value:        0 if success, otherwise error code
1305  */
1306 static int ioctl(struct tty_struct *tty, struct file *file,
1307                  unsigned int cmd, unsigned long arg)
1308 {
1309         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1310         int error;
1311         struct mgsl_icount cnow;        /* kernel counter temps */
1312         struct serial_icounter_struct __user *p_cuser;  /* user space */
1313         unsigned long flags;
1314         void __user *argp = (void __user *)arg;
1315
1316         if (debug_level >= DEBUG_LEVEL_INFO)
1317                 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1318                         info->device_name, cmd );
1319
1320         if (sanity_check(info, tty->name, "ioctl"))
1321                 return -ENODEV;
1322
1323         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1324             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1325                 if (tty->flags & (1 << TTY_IO_ERROR))
1326                     return -EIO;
1327         }
1328
1329         switch (cmd) {
1330         case MGSL_IOCGPARAMS:
1331                 return get_params(info, argp);
1332         case MGSL_IOCSPARAMS:
1333                 return set_params(info, argp);
1334         case MGSL_IOCGTXIDLE:
1335                 return get_txidle(info, argp);
1336         case MGSL_IOCSTXIDLE:
1337                 return set_txidle(info, (int)arg);
1338         case MGSL_IOCTXENABLE:
1339                 return tx_enable(info, (int)arg);
1340         case MGSL_IOCRXENABLE:
1341                 return rx_enable(info, (int)arg);
1342         case MGSL_IOCTXABORT:
1343                 return tx_abort(info);
1344         case MGSL_IOCGSTATS:
1345                 return get_stats(info, argp);
1346         case MGSL_IOCWAITEVENT:
1347                 return wait_mgsl_event(info, argp);
1348         case MGSL_IOCLOOPTXDONE:
1349                 return 0; // TODO: Not supported, need to document
1350                 /* Wait for modem input (DCD,RI,DSR,CTS) change
1351                  * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1352                  */
1353         case TIOCMIWAIT:
1354                 return modem_input_wait(info,(int)arg);
1355                 
1356                 /*
1357                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1358                  * Return: write counters to the user passed counter struct
1359                  * NB: both 1->0 and 0->1 transitions are counted except for
1360                  *     RI where only 0->1 is counted.
1361                  */
1362         case TIOCGICOUNT:
1363                 spin_lock_irqsave(&info->lock,flags);
1364                 cnow = info->icount;
1365                 spin_unlock_irqrestore(&info->lock,flags);
1366                 p_cuser = argp;
1367                 PUT_USER(error,cnow.cts, &p_cuser->cts);
1368                 if (error) return error;
1369                 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
1370                 if (error) return error;
1371                 PUT_USER(error,cnow.rng, &p_cuser->rng);
1372                 if (error) return error;
1373                 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
1374                 if (error) return error;
1375                 PUT_USER(error,cnow.rx, &p_cuser->rx);
1376                 if (error) return error;
1377                 PUT_USER(error,cnow.tx, &p_cuser->tx);
1378                 if (error) return error;
1379                 PUT_USER(error,cnow.frame, &p_cuser->frame);
1380                 if (error) return error;
1381                 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
1382                 if (error) return error;
1383                 PUT_USER(error,cnow.parity, &p_cuser->parity);
1384                 if (error) return error;
1385                 PUT_USER(error,cnow.brk, &p_cuser->brk);
1386                 if (error) return error;
1387                 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
1388                 if (error) return error;
1389                 return 0;
1390         default:
1391                 return -ENOIOCTLCMD;
1392         }
1393         return 0;
1394 }
1395
1396 /*
1397  * /proc fs routines....
1398  */
1399
1400 static inline int line_info(char *buf, SLMP_INFO *info)
1401 {
1402         char    stat_buf[30];
1403         int     ret;
1404         unsigned long flags;
1405
1406         ret = sprintf(buf, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1407                        "\tIRQ=%d MaxFrameSize=%u\n",
1408                 info->device_name,
1409                 info->phys_sca_base,
1410                 info->phys_memory_base,
1411                 info->phys_statctrl_base,
1412                 info->phys_lcr_base,
1413                 info->irq_level,
1414                 info->max_frame_size );
1415
1416         /* output current serial signal states */
1417         spin_lock_irqsave(&info->lock,flags);
1418         get_signals(info);
1419         spin_unlock_irqrestore(&info->lock,flags);
1420
1421         stat_buf[0] = 0;
1422         stat_buf[1] = 0;
1423         if (info->serial_signals & SerialSignal_RTS)
1424                 strcat(stat_buf, "|RTS");
1425         if (info->serial_signals & SerialSignal_CTS)
1426                 strcat(stat_buf, "|CTS");
1427         if (info->serial_signals & SerialSignal_DTR)
1428                 strcat(stat_buf, "|DTR");
1429         if (info->serial_signals & SerialSignal_DSR)
1430                 strcat(stat_buf, "|DSR");
1431         if (info->serial_signals & SerialSignal_DCD)
1432                 strcat(stat_buf, "|CD");
1433         if (info->serial_signals & SerialSignal_RI)
1434                 strcat(stat_buf, "|RI");
1435
1436         if (info->params.mode == MGSL_MODE_HDLC) {
1437                 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1438                               info->icount.txok, info->icount.rxok);
1439                 if (info->icount.txunder)
1440                         ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1441                 if (info->icount.txabort)
1442                         ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1443                 if (info->icount.rxshort)
1444                         ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1445                 if (info->icount.rxlong)
1446                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1447                 if (info->icount.rxover)
1448                         ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1449                 if (info->icount.rxcrc)
1450                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxcrc);
1451         } else {
1452                 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1453                               info->icount.tx, info->icount.rx);
1454                 if (info->icount.frame)
1455                         ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1456                 if (info->icount.parity)
1457                         ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1458                 if (info->icount.brk)
1459                         ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1460                 if (info->icount.overrun)
1461                         ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1462         }
1463
1464         /* Append serial signal status to end */
1465         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1466
1467         ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1468          info->tx_active,info->bh_requested,info->bh_running,
1469          info->pending_bh);
1470
1471         return ret;
1472 }
1473
1474 /* Called to print information about devices
1475  */
1476 int read_proc(char *page, char **start, off_t off, int count,
1477               int *eof, void *data)
1478 {
1479         int len = 0, l;
1480         off_t   begin = 0;
1481         SLMP_INFO *info;
1482
1483         len += sprintf(page, "synclinkmp driver:%s\n", driver_version);
1484
1485         info = synclinkmp_device_list;
1486         while( info ) {
1487                 l = line_info(page + len, info);
1488                 len += l;
1489                 if (len+begin > off+count)
1490                         goto done;
1491                 if (len+begin < off) {
1492                         begin += len;
1493                         len = 0;
1494                 }
1495                 info = info->next_device;
1496         }
1497
1498         *eof = 1;
1499 done:
1500         if (off >= len+begin)
1501                 return 0;
1502         *start = page + (off-begin);
1503         return ((count < begin+len-off) ? count : begin+len-off);
1504 }
1505
1506 /* Return the count of bytes in transmit buffer
1507  */
1508 static int chars_in_buffer(struct tty_struct *tty)
1509 {
1510         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1511
1512         if (sanity_check(info, tty->name, "chars_in_buffer"))
1513                 return 0;
1514
1515         if (debug_level >= DEBUG_LEVEL_INFO)
1516                 printk("%s(%d):%s chars_in_buffer()=%d\n",
1517                        __FILE__, __LINE__, info->device_name, info->tx_count);
1518
1519         return info->tx_count;
1520 }
1521
1522 /* Signal remote device to throttle send data (our receive data)
1523  */
1524 static void throttle(struct tty_struct * tty)
1525 {
1526         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1527         unsigned long flags;
1528
1529         if (debug_level >= DEBUG_LEVEL_INFO)
1530                 printk("%s(%d):%s throttle() entry\n",
1531                          __FILE__,__LINE__, info->device_name );
1532
1533         if (sanity_check(info, tty->name, "throttle"))
1534                 return;
1535
1536         if (I_IXOFF(tty))
1537                 send_xchar(tty, STOP_CHAR(tty));
1538
1539         if (tty->termios->c_cflag & CRTSCTS) {
1540                 spin_lock_irqsave(&info->lock,flags);
1541                 info->serial_signals &= ~SerialSignal_RTS;
1542                 set_signals(info);
1543                 spin_unlock_irqrestore(&info->lock,flags);
1544         }
1545 }
1546
1547 /* Signal remote device to stop throttling send data (our receive data)
1548  */
1549 static void unthrottle(struct tty_struct * tty)
1550 {
1551         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1552         unsigned long flags;
1553
1554         if (debug_level >= DEBUG_LEVEL_INFO)
1555                 printk("%s(%d):%s unthrottle() entry\n",
1556                          __FILE__,__LINE__, info->device_name );
1557
1558         if (sanity_check(info, tty->name, "unthrottle"))
1559                 return;
1560
1561         if (I_IXOFF(tty)) {
1562                 if (info->x_char)
1563                         info->x_char = 0;
1564                 else
1565                         send_xchar(tty, START_CHAR(tty));
1566         }
1567
1568         if (tty->termios->c_cflag & CRTSCTS) {
1569                 spin_lock_irqsave(&info->lock,flags);
1570                 info->serial_signals |= SerialSignal_RTS;
1571                 set_signals(info);
1572                 spin_unlock_irqrestore(&info->lock,flags);
1573         }
1574 }
1575
1576 /* set or clear transmit break condition
1577  * break_state  -1=set break condition, 0=clear
1578  */
1579 static void set_break(struct tty_struct *tty, int break_state)
1580 {
1581         unsigned char RegValue;
1582         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1583         unsigned long flags;
1584
1585         if (debug_level >= DEBUG_LEVEL_INFO)
1586                 printk("%s(%d):%s set_break(%d)\n",
1587                          __FILE__,__LINE__, info->device_name, break_state);
1588
1589         if (sanity_check(info, tty->name, "set_break"))
1590                 return;
1591
1592         spin_lock_irqsave(&info->lock,flags);
1593         RegValue = read_reg(info, CTL);
1594         if (break_state == -1)
1595                 RegValue |= BIT3;
1596         else
1597                 RegValue &= ~BIT3;
1598         write_reg(info, CTL, RegValue);
1599         spin_unlock_irqrestore(&info->lock,flags);
1600 }
1601
1602 #if SYNCLINK_GENERIC_HDLC
1603
1604 /**
1605  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1606  * set encoding and frame check sequence (FCS) options
1607  *
1608  * dev       pointer to network device structure
1609  * encoding  serial encoding setting
1610  * parity    FCS setting
1611  *
1612  * returns 0 if success, otherwise error code
1613  */
1614 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1615                           unsigned short parity)
1616 {
1617         SLMP_INFO *info = dev_to_port(dev);
1618         unsigned char  new_encoding;
1619         unsigned short new_crctype;
1620
1621         /* return error if TTY interface open */
1622         if (info->count)
1623                 return -EBUSY;
1624
1625         switch (encoding)
1626         {
1627         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1628         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1629         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1630         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1631         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1632         default: return -EINVAL;
1633         }
1634
1635         switch (parity)
1636         {
1637         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1638         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1639         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1640         default: return -EINVAL;
1641         }
1642
1643         info->params.encoding = new_encoding;
1644         info->params.crc_type = new_crctype;
1645
1646         /* if network interface up, reprogram hardware */
1647         if (info->netcount)
1648                 program_hw(info);
1649
1650         return 0;
1651 }
1652
1653 /**
1654  * called by generic HDLC layer to send frame
1655  *
1656  * skb  socket buffer containing HDLC frame
1657  * dev  pointer to network device structure
1658  *
1659  * returns 0 if success, otherwise error code
1660  */
1661 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1662 {
1663         SLMP_INFO *info = dev_to_port(dev);
1664         struct net_device_stats *stats = hdlc_stats(dev);
1665         unsigned long flags;
1666
1667         if (debug_level >= DEBUG_LEVEL_INFO)
1668                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1669
1670         /* stop sending until this frame completes */
1671         netif_stop_queue(dev);
1672
1673         /* copy data to device buffers */
1674         info->tx_count = skb->len;
1675         tx_load_dma_buffer(info, skb->data, skb->len);
1676
1677         /* update network statistics */
1678         stats->tx_packets++;
1679         stats->tx_bytes += skb->len;
1680
1681         /* done with socket buffer, so free it */
1682         dev_kfree_skb(skb);
1683
1684         /* save start time for transmit timeout detection */
1685         dev->trans_start = jiffies;
1686
1687         /* start hardware transmitter if necessary */
1688         spin_lock_irqsave(&info->lock,flags);
1689         if (!info->tx_active)
1690                 tx_start(info);
1691         spin_unlock_irqrestore(&info->lock,flags);
1692
1693         return 0;
1694 }
1695
1696 /**
1697  * called by network layer when interface enabled
1698  * claim resources and initialize hardware
1699  *
1700  * dev  pointer to network device structure
1701  *
1702  * returns 0 if success, otherwise error code
1703  */
1704 static int hdlcdev_open(struct net_device *dev)
1705 {
1706         SLMP_INFO *info = dev_to_port(dev);
1707         int rc;
1708         unsigned long flags;
1709
1710         if (debug_level >= DEBUG_LEVEL_INFO)
1711                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1712
1713         /* generic HDLC layer open processing */
1714         if ((rc = hdlc_open(dev)))
1715                 return rc;
1716
1717         /* arbitrate between network and tty opens */
1718         spin_lock_irqsave(&info->netlock, flags);
1719         if (info->count != 0 || info->netcount != 0) {
1720                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1721                 spin_unlock_irqrestore(&info->netlock, flags);
1722                 return -EBUSY;
1723         }
1724         info->netcount=1;
1725         spin_unlock_irqrestore(&info->netlock, flags);
1726
1727         /* claim resources and init adapter */
1728         if ((rc = startup(info)) != 0) {
1729                 spin_lock_irqsave(&info->netlock, flags);
1730                 info->netcount=0;
1731                 spin_unlock_irqrestore(&info->netlock, flags);
1732                 return rc;
1733         }
1734
1735         /* assert DTR and RTS, apply hardware settings */
1736         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1737         program_hw(info);
1738
1739         /* enable network layer transmit */
1740         dev->trans_start = jiffies;
1741         netif_start_queue(dev);
1742
1743         /* inform generic HDLC layer of current DCD status */
1744         spin_lock_irqsave(&info->lock, flags);
1745         get_signals(info);
1746         spin_unlock_irqrestore(&info->lock, flags);
1747         if (info->serial_signals & SerialSignal_DCD)
1748                 netif_carrier_on(dev);
1749         else
1750                 netif_carrier_off(dev);
1751         return 0;
1752 }
1753
1754 /**
1755  * called by network layer when interface is disabled
1756  * shutdown hardware and release resources
1757  *
1758  * dev  pointer to network device structure
1759  *
1760  * returns 0 if success, otherwise error code
1761  */
1762 static int hdlcdev_close(struct net_device *dev)
1763 {
1764         SLMP_INFO *info = dev_to_port(dev);
1765         unsigned long flags;
1766
1767         if (debug_level >= DEBUG_LEVEL_INFO)
1768                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1769
1770         netif_stop_queue(dev);
1771
1772         /* shutdown adapter and release resources */
1773         shutdown(info);
1774
1775         hdlc_close(dev);
1776
1777         spin_lock_irqsave(&info->netlock, flags);
1778         info->netcount=0;
1779         spin_unlock_irqrestore(&info->netlock, flags);
1780
1781         return 0;
1782 }
1783
1784 /**
1785  * called by network layer to process IOCTL call to network device
1786  *
1787  * dev  pointer to network device structure
1788  * ifr  pointer to network interface request structure
1789  * cmd  IOCTL command code
1790  *
1791  * returns 0 if success, otherwise error code
1792  */
1793 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1794 {
1795         const size_t size = sizeof(sync_serial_settings);
1796         sync_serial_settings new_line;
1797         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1798         SLMP_INFO *info = dev_to_port(dev);
1799         unsigned int flags;
1800
1801         if (debug_level >= DEBUG_LEVEL_INFO)
1802                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1803
1804         /* return error if TTY interface open */
1805         if (info->count)
1806                 return -EBUSY;
1807
1808         if (cmd != SIOCWANDEV)
1809                 return hdlc_ioctl(dev, ifr, cmd);
1810
1811         switch(ifr->ifr_settings.type) {
1812         case IF_GET_IFACE: /* return current sync_serial_settings */
1813
1814                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1815                 if (ifr->ifr_settings.size < size) {
1816                         ifr->ifr_settings.size = size; /* data size wanted */
1817                         return -ENOBUFS;
1818                 }
1819
1820                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1821                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1822                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1823                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1824
1825                 switch (flags){
1826                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1827                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1828                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1829                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1830                 default: new_line.clock_type = CLOCK_DEFAULT;
1831                 }
1832
1833                 new_line.clock_rate = info->params.clock_speed;
1834                 new_line.loopback   = info->params.loopback ? 1:0;
1835
1836                 if (copy_to_user(line, &new_line, size))
1837                         return -EFAULT;
1838                 return 0;
1839
1840         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1841
1842                 if(!capable(CAP_NET_ADMIN))
1843                         return -EPERM;
1844                 if (copy_from_user(&new_line, line, size))
1845                         return -EFAULT;
1846
1847                 switch (new_line.clock_type)
1848                 {
1849                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1850                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1851                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1852                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1853                 case CLOCK_DEFAULT:  flags = info->params.flags &
1854                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1855                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1856                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1857                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1858                 default: return -EINVAL;
1859                 }
1860
1861                 if (new_line.loopback != 0 && new_line.loopback != 1)
1862                         return -EINVAL;
1863
1864                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1865                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1866                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1867                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1868                 info->params.flags |= flags;
1869
1870                 info->params.loopback = new_line.loopback;
1871
1872                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1873                         info->params.clock_speed = new_line.clock_rate;
1874                 else
1875                         info->params.clock_speed = 0;
1876
1877                 /* if network interface up, reprogram hardware */
1878                 if (info->netcount)
1879                         program_hw(info);
1880                 return 0;
1881
1882         default:
1883                 return hdlc_ioctl(dev, ifr, cmd);
1884         }
1885 }
1886
1887 /**
1888  * called by network layer when transmit timeout is detected
1889  *
1890  * dev  pointer to network device structure
1891  */
1892 static void hdlcdev_tx_timeout(struct net_device *dev)
1893 {
1894         SLMP_INFO *info = dev_to_port(dev);
1895         struct net_device_stats *stats = hdlc_stats(dev);
1896         unsigned long flags;
1897
1898         if (debug_level >= DEBUG_LEVEL_INFO)
1899                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1900
1901         stats->tx_errors++;
1902         stats->tx_aborted_errors++;
1903
1904         spin_lock_irqsave(&info->lock,flags);
1905         tx_stop(info);
1906         spin_unlock_irqrestore(&info->lock,flags);
1907
1908         netif_wake_queue(dev);
1909 }
1910
1911 /**
1912  * called by device driver when transmit completes
1913  * reenable network layer transmit if stopped
1914  *
1915  * info  pointer to device instance information
1916  */
1917 static void hdlcdev_tx_done(SLMP_INFO *info)
1918 {
1919         if (netif_queue_stopped(info->netdev))
1920                 netif_wake_queue(info->netdev);
1921 }
1922
1923 /**
1924  * called by device driver when frame received
1925  * pass frame to network layer
1926  *
1927  * info  pointer to device instance information
1928  * buf   pointer to buffer contianing frame data
1929  * size  count of data bytes in buf
1930  */
1931 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1932 {
1933         struct sk_buff *skb = dev_alloc_skb(size);
1934         struct net_device *dev = info->netdev;
1935         struct net_device_stats *stats = hdlc_stats(dev);
1936
1937         if (debug_level >= DEBUG_LEVEL_INFO)
1938                 printk("hdlcdev_rx(%s)\n",dev->name);
1939
1940         if (skb == NULL) {
1941                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
1942                 stats->rx_dropped++;
1943                 return;
1944         }
1945
1946         memcpy(skb_put(skb, size),buf,size);
1947
1948         skb->protocol = hdlc_type_trans(skb, info->netdev);
1949
1950         stats->rx_packets++;
1951         stats->rx_bytes += size;
1952
1953         netif_rx(skb);
1954
1955         info->netdev->last_rx = jiffies;
1956 }
1957
1958 /**
1959  * called by device driver when adding device instance
1960  * do generic HDLC initialization
1961  *
1962  * info  pointer to device instance information
1963  *
1964  * returns 0 if success, otherwise error code
1965  */
1966 static int hdlcdev_init(SLMP_INFO *info)
1967 {
1968         int rc;
1969         struct net_device *dev;
1970         hdlc_device *hdlc;
1971
1972         /* allocate and initialize network and HDLC layer objects */
1973
1974         if (!(dev = alloc_hdlcdev(info))) {
1975                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1976                 return -ENOMEM;
1977         }
1978
1979         /* for network layer reporting purposes only */
1980         dev->mem_start = info->phys_sca_base;
1981         dev->mem_end   = info->phys_sca_base + SCA_BASE_SIZE - 1;
1982         dev->irq       = info->irq_level;
1983
1984         /* network layer callbacks and settings */
1985         dev->do_ioctl       = hdlcdev_ioctl;
1986         dev->open           = hdlcdev_open;
1987         dev->stop           = hdlcdev_close;
1988         dev->tx_timeout     = hdlcdev_tx_timeout;
1989         dev->watchdog_timeo = 10*HZ;
1990         dev->tx_queue_len   = 50;
1991
1992         /* generic HDLC layer callbacks and settings */
1993         hdlc         = dev_to_hdlc(dev);
1994         hdlc->attach = hdlcdev_attach;
1995         hdlc->xmit   = hdlcdev_xmit;
1996
1997         /* register objects with HDLC layer */
1998         if ((rc = register_hdlc_device(dev))) {
1999                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
2000                 free_netdev(dev);
2001                 return rc;
2002         }
2003
2004         info->netdev = dev;
2005         return 0;
2006 }
2007
2008 /**
2009  * called by device driver when removing device instance
2010  * do generic HDLC cleanup
2011  *
2012  * info  pointer to device instance information
2013  */
2014 static void hdlcdev_exit(SLMP_INFO *info)
2015 {
2016         unregister_hdlc_device(info->netdev);
2017         free_netdev(info->netdev);
2018         info->netdev = NULL;
2019 }
2020
2021 #endif /* CONFIG_HDLC */
2022
2023
2024 /* Return next bottom half action to perform.
2025  * Return Value:        BH action code or 0 if nothing to do.
2026  */
2027 int bh_action(SLMP_INFO *info)
2028 {
2029         unsigned long flags;
2030         int rc = 0;
2031
2032         spin_lock_irqsave(&info->lock,flags);
2033
2034         if (info->pending_bh & BH_RECEIVE) {
2035                 info->pending_bh &= ~BH_RECEIVE;
2036                 rc = BH_RECEIVE;
2037         } else if (info->pending_bh & BH_TRANSMIT) {
2038                 info->pending_bh &= ~BH_TRANSMIT;
2039                 rc = BH_TRANSMIT;
2040         } else if (info->pending_bh & BH_STATUS) {
2041                 info->pending_bh &= ~BH_STATUS;
2042                 rc = BH_STATUS;
2043         }
2044
2045         if (!rc) {
2046                 /* Mark BH routine as complete */
2047                 info->bh_running   = 0;
2048                 info->bh_requested = 0;
2049         }
2050
2051         spin_unlock_irqrestore(&info->lock,flags);
2052
2053         return rc;
2054 }
2055
2056 /* Perform bottom half processing of work items queued by ISR.
2057  */
2058 void bh_handler(struct work_struct *work)
2059 {
2060         SLMP_INFO *info = container_of(work, SLMP_INFO, task);
2061         int action;
2062
2063         if (!info)
2064                 return;
2065
2066         if ( debug_level >= DEBUG_LEVEL_BH )
2067                 printk( "%s(%d):%s bh_handler() entry\n",
2068                         __FILE__,__LINE__,info->device_name);
2069
2070         info->bh_running = 1;
2071
2072         while((action = bh_action(info)) != 0) {
2073
2074                 /* Process work item */
2075                 if ( debug_level >= DEBUG_LEVEL_BH )
2076                         printk( "%s(%d):%s bh_handler() work item action=%d\n",
2077                                 __FILE__,__LINE__,info->device_name, action);
2078
2079                 switch (action) {
2080
2081                 case BH_RECEIVE:
2082                         bh_receive(info);
2083                         break;
2084                 case BH_TRANSMIT:
2085                         bh_transmit(info);
2086                         break;
2087                 case BH_STATUS:
2088                         bh_status(info);
2089                         break;
2090                 default:
2091                         /* unknown work item ID */
2092                         printk("%s(%d):%s Unknown work item ID=%08X!\n",
2093                                 __FILE__,__LINE__,info->device_name,action);
2094                         break;
2095                 }
2096         }
2097
2098         if ( debug_level >= DEBUG_LEVEL_BH )
2099                 printk( "%s(%d):%s bh_handler() exit\n",
2100                         __FILE__,__LINE__,info->device_name);
2101 }
2102
2103 void bh_receive(SLMP_INFO *info)
2104 {
2105         if ( debug_level >= DEBUG_LEVEL_BH )
2106                 printk( "%s(%d):%s bh_receive()\n",
2107                         __FILE__,__LINE__,info->device_name);
2108
2109         while( rx_get_frame(info) );
2110 }
2111
2112 void bh_transmit(SLMP_INFO *info)
2113 {
2114         struct tty_struct *tty = info->tty;
2115
2116         if ( debug_level >= DEBUG_LEVEL_BH )
2117                 printk( "%s(%d):%s bh_transmit() entry\n",
2118                         __FILE__,__LINE__,info->device_name);
2119
2120         if (tty)
2121                 tty_wakeup(tty);
2122 }
2123
2124 void bh_status(SLMP_INFO *info)
2125 {
2126         if ( debug_level >= DEBUG_LEVEL_BH )
2127                 printk( "%s(%d):%s bh_status() entry\n",
2128                         __FILE__,__LINE__,info->device_name);
2129
2130         info->ri_chkcount = 0;
2131         info->dsr_chkcount = 0;
2132         info->dcd_chkcount = 0;
2133         info->cts_chkcount = 0;
2134 }
2135
2136 void isr_timer(SLMP_INFO * info)
2137 {
2138         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2139
2140         /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2141         write_reg(info, IER2, 0);
2142
2143         /* TMCS, Timer Control/Status Register
2144          *
2145          * 07      CMF, Compare match flag (read only) 1=match
2146          * 06      ECMI, CMF Interrupt Enable: 0=disabled
2147          * 05      Reserved, must be 0
2148          * 04      TME, Timer Enable
2149          * 03..00  Reserved, must be 0
2150          *
2151          * 0000 0000
2152          */
2153         write_reg(info, (unsigned char)(timer + TMCS), 0);
2154
2155         info->irq_occurred = TRUE;
2156
2157         if ( debug_level >= DEBUG_LEVEL_ISR )
2158                 printk("%s(%d):%s isr_timer()\n",
2159                         __FILE__,__LINE__,info->device_name);
2160 }
2161
2162 void isr_rxint(SLMP_INFO * info)
2163 {
2164         struct tty_struct *tty = info->tty;
2165         struct  mgsl_icount *icount = &info->icount;
2166         unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2167         unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2168
2169         /* clear status bits */
2170         if (status)
2171                 write_reg(info, SR1, status);
2172
2173         if (status2)
2174                 write_reg(info, SR2, status2);
2175         
2176         if ( debug_level >= DEBUG_LEVEL_ISR )
2177                 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2178                         __FILE__,__LINE__,info->device_name,status,status2);
2179
2180         if (info->params.mode == MGSL_MODE_ASYNC) {
2181                 if (status & BRKD) {
2182                         icount->brk++;
2183
2184                         /* process break detection if tty control
2185                          * is not set to ignore it
2186                          */
2187                         if ( tty ) {
2188                                 if (!(status & info->ignore_status_mask1)) {
2189                                         if (info->read_status_mask1 & BRKD) {
2190                                                 tty_insert_flip_char(tty, 0, TTY_BREAK);
2191                                                 if (info->flags & ASYNC_SAK)
2192                                                         do_SAK(tty);
2193                                         }
2194                                 }
2195                         }
2196                 }
2197         }
2198         else {
2199                 if (status & (FLGD|IDLD)) {
2200                         if (status & FLGD)
2201                                 info->icount.exithunt++;
2202                         else if (status & IDLD)
2203                                 info->icount.rxidle++;
2204                         wake_up_interruptible(&info->event_wait_q);
2205                 }
2206         }
2207
2208         if (status & CDCD) {
2209                 /* simulate a common modem status change interrupt
2210                  * for our handler
2211                  */
2212                 get_signals( info );
2213                 isr_io_pin(info,
2214                         MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2215         }
2216 }
2217
2218 /*
2219  * handle async rx data interrupts
2220  */
2221 void isr_rxrdy(SLMP_INFO * info)
2222 {
2223         u16 status;
2224         unsigned char DataByte;
2225         struct tty_struct *tty = info->tty;
2226         struct  mgsl_icount *icount = &info->icount;
2227
2228         if ( debug_level >= DEBUG_LEVEL_ISR )
2229                 printk("%s(%d):%s isr_rxrdy\n",
2230                         __FILE__,__LINE__,info->device_name);
2231
2232         while((status = read_reg(info,CST0)) & BIT0)
2233         {
2234                 int flag = 0;
2235                 int over = 0;
2236                 DataByte = read_reg(info,TRB);
2237
2238                 icount->rx++;
2239
2240                 if ( status & (PE + FRME + OVRN) ) {
2241                         printk("%s(%d):%s rxerr=%04X\n",
2242                                 __FILE__,__LINE__,info->device_name,status);
2243
2244                         /* update error statistics */
2245                         if (status & PE)
2246                                 icount->parity++;
2247                         else if (status & FRME)
2248                                 icount->frame++;
2249                         else if (status & OVRN)
2250                                 icount->overrun++;
2251
2252                         /* discard char if tty control flags say so */
2253                         if (status & info->ignore_status_mask2)
2254                                 continue;
2255
2256                         status &= info->read_status_mask2;
2257
2258                         if ( tty ) {
2259                                 if (status & PE)
2260                                         flag = TTY_PARITY;
2261                                 else if (status & FRME)
2262                                         flag = TTY_FRAME;
2263                                 if (status & OVRN) {
2264                                         /* Overrun is special, since it's
2265                                          * reported immediately, and doesn't
2266                                          * affect the current character
2267                                          */
2268                                         over = 1;
2269                                 }
2270                         }
2271                 }       /* end of if (error) */
2272
2273                 if ( tty ) {
2274                         tty_insert_flip_char(tty, DataByte, flag);
2275                         if (over)
2276                                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
2277                 }
2278         }
2279
2280         if ( debug_level >= DEBUG_LEVEL_ISR ) {
2281                 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2282                         __FILE__,__LINE__,info->device_name,
2283                         icount->rx,icount->brk,icount->parity,
2284                         icount->frame,icount->overrun);
2285         }
2286
2287         if ( tty )
2288                 tty_flip_buffer_push(tty);
2289 }
2290
2291 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2292 {
2293         if ( debug_level >= DEBUG_LEVEL_ISR )
2294                 printk("%s(%d):%s isr_txeom status=%02x\n",
2295                         __FILE__,__LINE__,info->device_name,status);
2296
2297         write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2298         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2299         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2300
2301         if (status & UDRN) {
2302                 write_reg(info, CMD, TXRESET);
2303                 write_reg(info, CMD, TXENABLE);
2304         } else
2305                 write_reg(info, CMD, TXBUFCLR);
2306
2307         /* disable and clear tx interrupts */
2308         info->ie0_value &= ~TXRDYE;
2309         info->ie1_value &= ~(IDLE + UDRN);
2310         write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2311         write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2312
2313         if ( info->tx_active ) {
2314                 if (info->params.mode != MGSL_MODE_ASYNC) {
2315                         if (status & UDRN)
2316                                 info->icount.txunder++;
2317                         else if (status & IDLE)
2318                                 info->icount.txok++;
2319                 }
2320
2321                 info->tx_active = 0;
2322                 info->tx_count = info->tx_put = info->tx_get = 0;
2323
2324                 del_timer(&info->tx_timer);
2325
2326                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2327                         info->serial_signals &= ~SerialSignal_RTS;
2328                         info->drop_rts_on_tx_done = 0;
2329                         set_signals(info);
2330                 }
2331
2332 #if SYNCLINK_GENERIC_HDLC
2333                 if (info->netcount)
2334                         hdlcdev_tx_done(info);
2335                 else
2336 #endif
2337                 {
2338                         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2339                                 tx_stop(info);
2340                                 return;
2341                         }
2342                         info->pending_bh |= BH_TRANSMIT;
2343                 }
2344         }
2345 }
2346
2347
2348 /*
2349  * handle tx status interrupts
2350  */
2351 void isr_txint(SLMP_INFO * info)
2352 {
2353         unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2354
2355         /* clear status bits */
2356         write_reg(info, SR1, status);
2357
2358         if ( debug_level >= DEBUG_LEVEL_ISR )
2359                 printk("%s(%d):%s isr_txint status=%02x\n",
2360                         __FILE__,__LINE__,info->device_name,status);
2361
2362         if (status & (UDRN + IDLE))
2363                 isr_txeom(info, status);
2364
2365         if (status & CCTS) {
2366                 /* simulate a common modem status change interrupt
2367                  * for our handler
2368                  */
2369                 get_signals( info );
2370                 isr_io_pin(info,
2371                         MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2372
2373         }
2374 }
2375
2376 /*
2377  * handle async tx data interrupts
2378  */
2379 void isr_txrdy(SLMP_INFO * info)
2380 {
2381         if ( debug_level >= DEBUG_LEVEL_ISR )
2382                 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2383                         __FILE__,__LINE__,info->device_name,info->tx_count);
2384
2385         if (info->params.mode != MGSL_MODE_ASYNC) {
2386                 /* disable TXRDY IRQ, enable IDLE IRQ */
2387                 info->ie0_value &= ~TXRDYE;
2388                 info->ie1_value |= IDLE;
2389                 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2390                 return;
2391         }
2392
2393         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2394                 tx_stop(info);
2395                 return;
2396         }
2397
2398         if ( info->tx_count )
2399                 tx_load_fifo( info );
2400         else {
2401                 info->tx_active = 0;
2402                 info->ie0_value &= ~TXRDYE;
2403                 write_reg(info, IE0, info->ie0_value);
2404         }
2405
2406         if (info->tx_count < WAKEUP_CHARS)
2407                 info->pending_bh |= BH_TRANSMIT;
2408 }
2409
2410 void isr_rxdmaok(SLMP_INFO * info)
2411 {
2412         /* BIT7 = EOT (end of transfer)
2413          * BIT6 = EOM (end of message/frame)
2414          */
2415         unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2416
2417         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2418         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2419
2420         if ( debug_level >= DEBUG_LEVEL_ISR )
2421                 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2422                         __FILE__,__LINE__,info->device_name,status);
2423
2424         info->pending_bh |= BH_RECEIVE;
2425 }
2426
2427 void isr_rxdmaerror(SLMP_INFO * info)
2428 {
2429         /* BIT5 = BOF (buffer overflow)
2430          * BIT4 = COF (counter overflow)
2431          */
2432         unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2433
2434         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2435         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2436
2437         if ( debug_level >= DEBUG_LEVEL_ISR )
2438                 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2439                         __FILE__,__LINE__,info->device_name,status);
2440
2441         info->rx_overflow = TRUE;
2442         info->pending_bh |= BH_RECEIVE;
2443 }
2444
2445 void isr_txdmaok(SLMP_INFO * info)
2446 {
2447         unsigned char status_reg1 = read_reg(info, SR1);
2448
2449         write_reg(info, TXDMA + DIR, 0x00);     /* disable Tx DMA IRQs */
2450         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2451         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2452
2453         if ( debug_level >= DEBUG_LEVEL_ISR )
2454                 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2455                         __FILE__,__LINE__,info->device_name,status_reg1);
2456
2457         /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2458         write_reg16(info, TRC0, 0);
2459         info->ie0_value |= TXRDYE;
2460         write_reg(info, IE0, info->ie0_value);
2461 }
2462
2463 void isr_txdmaerror(SLMP_INFO * info)
2464 {
2465         /* BIT5 = BOF (buffer overflow)
2466          * BIT4 = COF (counter overflow)
2467          */
2468         unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2469
2470         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2471         write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2472
2473         if ( debug_level >= DEBUG_LEVEL_ISR )
2474                 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2475                         __FILE__,__LINE__,info->device_name,status);
2476 }
2477
2478 /* handle input serial signal changes
2479  */
2480 void isr_io_pin( SLMP_INFO *info, u16 status )
2481 {
2482         struct  mgsl_icount *icount;
2483
2484         if ( debug_level >= DEBUG_LEVEL_ISR )
2485                 printk("%s(%d):isr_io_pin status=%04X\n",
2486                         __FILE__,__LINE__,status);
2487
2488         if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2489                       MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2490                 icount = &info->icount;
2491                 /* update input line counters */
2492                 if (status & MISCSTATUS_RI_LATCHED) {
2493                         icount->rng++;
2494                         if ( status & SerialSignal_RI )
2495                                 info->input_signal_events.ri_up++;
2496                         else
2497                                 info->input_signal_events.ri_down++;
2498                 }
2499                 if (status & MISCSTATUS_DSR_LATCHED) {
2500                         icount->dsr++;
2501                         if ( status & SerialSignal_DSR )
2502                                 info->input_signal_events.dsr_up++;
2503                         else
2504                                 info->input_signal_events.dsr_down++;
2505                 }
2506                 if (status & MISCSTATUS_DCD_LATCHED) {
2507                         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2508                                 info->ie1_value &= ~CDCD;
2509                                 write_reg(info, IE1, info->ie1_value);
2510                         }
2511                         icount->dcd++;
2512                         if (status & SerialSignal_DCD) {
2513                                 info->input_signal_events.dcd_up++;
2514                         } else
2515                                 info->input_signal_events.dcd_down++;
2516 #if SYNCLINK_GENERIC_HDLC
2517                         if (info->netcount) {
2518                                 if (status & SerialSignal_DCD)
2519                                         netif_carrier_on(info->netdev);
2520                                 else
2521                                         netif_carrier_off(info->netdev);
2522                         }
2523 #endif
2524                 }
2525                 if (status & MISCSTATUS_CTS_LATCHED)
2526                 {
2527                         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2528                                 info->ie1_value &= ~CCTS;
2529                                 write_reg(info, IE1, info->ie1_value);
2530                         }
2531                         icount->cts++;
2532                         if ( status & SerialSignal_CTS )
2533                                 info->input_signal_events.cts_up++;
2534                         else
2535                                 info->input_signal_events.cts_down++;
2536                 }
2537                 wake_up_interruptible(&info->status_event_wait_q);
2538                 wake_up_interruptible(&info->event_wait_q);
2539
2540                 if ( (info->flags & ASYNC_CHECK_CD) &&
2541                      (status & MISCSTATUS_DCD_LATCHED) ) {
2542                         if ( debug_level >= DEBUG_LEVEL_ISR )
2543                                 printk("%s CD now %s...", info->device_name,
2544                                        (status & SerialSignal_DCD) ? "on" : "off");
2545                         if (status & SerialSignal_DCD)
2546                                 wake_up_interruptible(&info->open_wait);
2547                         else {
2548                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2549                                         printk("doing serial hangup...");
2550                                 if (info->tty)
2551                                         tty_hangup(info->tty);
2552                         }
2553                 }
2554
2555                 if ( (info->flags & ASYNC_CTS_FLOW) &&
2556                      (status & MISCSTATUS_CTS_LATCHED) ) {
2557                         if ( info->tty ) {
2558                                 if (info->tty->hw_stopped) {
2559                                         if (status & SerialSignal_CTS) {
2560                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2561                                                         printk("CTS tx start...");
2562                                                 info->tty->hw_stopped = 0;
2563                                                 tx_start(info);
2564                                                 info->pending_bh |= BH_TRANSMIT;
2565                                                 return;
2566                                         }
2567                                 } else {
2568                                         if (!(status & SerialSignal_CTS)) {
2569                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2570                                                         printk("CTS tx stop...");
2571                                                 info->tty->hw_stopped = 1;
2572                                                 tx_stop(info);
2573                                         }
2574                                 }
2575                         }
2576                 }
2577         }
2578
2579         info->pending_bh |= BH_STATUS;
2580 }
2581
2582 /* Interrupt service routine entry point.
2583  *
2584  * Arguments:
2585  *      irq             interrupt number that caused interrupt
2586  *      dev_id          device ID supplied during interrupt registration
2587  *      regs            interrupted processor context
2588  */
2589 static irqreturn_t synclinkmp_interrupt(int irq, void *dev_id)
2590 {
2591         SLMP_INFO * info;
2592         unsigned char status, status0, status1=0;
2593         unsigned char dmastatus, dmastatus0, dmastatus1=0;
2594         unsigned char timerstatus0, timerstatus1=0;
2595         unsigned char shift;
2596         unsigned int i;
2597         unsigned short tmp;
2598
2599         if ( debug_level >= DEBUG_LEVEL_ISR )
2600                 printk("%s(%d): synclinkmp_interrupt(%d)entry.\n",
2601                         __FILE__,__LINE__,irq);
2602
2603         info = (SLMP_INFO *)dev_id;
2604         if (!info)
2605                 return IRQ_NONE;
2606
2607         spin_lock(&info->lock);
2608
2609         for(;;) {
2610
2611                 /* get status for SCA0 (ports 0-1) */
2612                 tmp = read_reg16(info, ISR0);   /* get ISR0 and ISR1 in one read */
2613                 status0 = (unsigned char)tmp;
2614                 dmastatus0 = (unsigned char)(tmp>>8);
2615                 timerstatus0 = read_reg(info, ISR2);
2616
2617                 if ( debug_level >= DEBUG_LEVEL_ISR )
2618                         printk("%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2619                                 __FILE__,__LINE__,info->device_name,
2620                                 status0,dmastatus0,timerstatus0);
2621
2622                 if (info->port_count == 4) {
2623                         /* get status for SCA1 (ports 2-3) */
2624                         tmp = read_reg16(info->port_array[2], ISR0);
2625                         status1 = (unsigned char)tmp;
2626                         dmastatus1 = (unsigned char)(tmp>>8);
2627                         timerstatus1 = read_reg(info->port_array[2], ISR2);
2628
2629                         if ( debug_level >= DEBUG_LEVEL_ISR )
2630                                 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2631                                         __FILE__,__LINE__,info->device_name,
2632                                         status1,dmastatus1,timerstatus1);
2633                 }
2634
2635                 if (!status0 && !dmastatus0 && !timerstatus0 &&
2636                          !status1 && !dmastatus1 && !timerstatus1)
2637                         break;
2638
2639                 for(i=0; i < info->port_count ; i++) {
2640                         if (info->port_array[i] == NULL)
2641                                 continue;
2642                         if (i < 2) {
2643                                 status = status0;
2644                                 dmastatus = dmastatus0;
2645                         } else {
2646                                 status = status1;
2647                                 dmastatus = dmastatus1;
2648                         }
2649
2650                         shift = i & 1 ? 4 :0;
2651
2652                         if (status & BIT0 << shift)
2653                                 isr_rxrdy(info->port_array[i]);
2654                         if (status & BIT1 << shift)
2655                                 isr_txrdy(info->port_array[i]);
2656                         if (status & BIT2 << shift)
2657                                 isr_rxint(info->port_array[i]);
2658                         if (status & BIT3 << shift)
2659                                 isr_txint(info->port_array[i]);
2660
2661                         if (dmastatus & BIT0 << shift)
2662                                 isr_rxdmaerror(info->port_array[i]);
2663                         if (dmastatus & BIT1 << shift)
2664                                 isr_rxdmaok(info->port_array[i]);
2665                         if (dmastatus & BIT2 << shift)
2666                                 isr_txdmaerror(info->port_array[i]);
2667                         if (dmastatus & BIT3 << shift)
2668                                 isr_txdmaok(info->port_array[i]);
2669                 }
2670
2671                 if (timerstatus0 & (BIT5 | BIT4))
2672                         isr_timer(info->port_array[0]);
2673                 if (timerstatus0 & (BIT7 | BIT6))
2674                         isr_timer(info->port_array[1]);
2675                 if (timerstatus1 & (BIT5 | BIT4))
2676                         isr_timer(info->port_array[2]);
2677                 if (timerstatus1 & (BIT7 | BIT6))
2678                         isr_timer(info->port_array[3]);
2679         }
2680
2681         for(i=0; i < info->port_count ; i++) {
2682                 SLMP_INFO * port = info->port_array[i];
2683
2684                 /* Request bottom half processing if there's something
2685                  * for it to do and the bh is not already running.
2686                  *
2687                  * Note: startup adapter diags require interrupts.
2688                  * do not request bottom half processing if the
2689                  * device is not open in a normal mode.
2690                  */
2691                 if ( port && (port->count || port->netcount) &&
2692                      port->pending_bh && !port->bh_running &&
2693                      !port->bh_requested ) {
2694                         if ( debug_level >= DEBUG_LEVEL_ISR )
2695                                 printk("%s(%d):%s queueing bh task.\n",
2696                                         __FILE__,__LINE__,port->device_name);
2697                         schedule_work(&port->task);
2698                         port->bh_requested = 1;
2699                 }
2700         }
2701
2702         spin_unlock(&info->lock);
2703
2704         if ( debug_level >= DEBUG_LEVEL_ISR )
2705                 printk("%s(%d):synclinkmp_interrupt(%d)exit.\n",
2706                         __FILE__,__LINE__,irq);
2707         return IRQ_HANDLED;
2708 }
2709
2710 /* Initialize and start device.
2711  */
2712 static int startup(SLMP_INFO * info)
2713 {
2714         if ( debug_level >= DEBUG_LEVEL_INFO )
2715                 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2716
2717         if (info->flags & ASYNC_INITIALIZED)
2718                 return 0;
2719
2720         if (!info->tx_buf) {
2721                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2722                 if (!info->tx_buf) {
2723                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2724                                 __FILE__,__LINE__,info->device_name);
2725                         return -ENOMEM;
2726                 }
2727         }
2728
2729         info->pending_bh = 0;
2730
2731         memset(&info->icount, 0, sizeof(info->icount));
2732
2733         /* program hardware for current parameters */
2734         reset_port(info);
2735
2736         change_params(info);
2737
2738         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
2739
2740         if (info->tty)
2741                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
2742
2743         info->flags |= ASYNC_INITIALIZED;
2744
2745         return 0;
2746 }
2747
2748 /* Called by close() and hangup() to shutdown hardware
2749  */
2750 static void shutdown(SLMP_INFO * info)
2751 {
2752         unsigned long flags;
2753
2754         if (!(info->flags & ASYNC_INITIALIZED))
2755                 return;
2756
2757         if (debug_level >= DEBUG_LEVEL_INFO)
2758                 printk("%s(%d):%s synclinkmp_shutdown()\n",
2759                          __FILE__,__LINE__, info->device_name );
2760
2761         /* clear status wait queue because status changes */
2762         /* can't happen after shutting down the hardware */
2763         wake_up_interruptible(&info->status_event_wait_q);
2764         wake_up_interruptible(&info->event_wait_q);
2765
2766         del_timer(&info->tx_timer);
2767         del_timer(&info->status_timer);
2768
2769         kfree(info->tx_buf);
2770         info->tx_buf = NULL;
2771
2772         spin_lock_irqsave(&info->lock,flags);
2773
2774         reset_port(info);
2775
2776         if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
2777                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2778                 set_signals(info);
2779         }
2780
2781         spin_unlock_irqrestore(&info->lock,flags);
2782
2783         if (info->tty)
2784                 set_bit(TTY_IO_ERROR, &info->tty->flags);
2785
2786         info->flags &= ~ASYNC_INITIALIZED;
2787 }
2788
2789 static void program_hw(SLMP_INFO *info)
2790 {
2791         unsigned long flags;
2792
2793         spin_lock_irqsave(&info->lock,flags);
2794
2795         rx_stop(info);
2796         tx_stop(info);
2797
2798         info->tx_count = info->tx_put = info->tx_get = 0;
2799
2800         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2801                 hdlc_mode(info);
2802         else
2803                 async_mode(info);
2804
2805         set_signals(info);
2806
2807         info->dcd_chkcount = 0;
2808         info->cts_chkcount = 0;
2809         info->ri_chkcount = 0;
2810         info->dsr_chkcount = 0;
2811
2812         info->ie1_value |= (CDCD|CCTS);
2813         write_reg(info, IE1, info->ie1_value);
2814
2815         get_signals(info);
2816
2817         if (info->netcount || (info->tty && info->tty->termios->c_cflag & CREAD) )
2818                 rx_start(info);
2819
2820         spin_unlock_irqrestore(&info->lock,flags);
2821 }
2822
2823 /* Reconfigure adapter based on new parameters
2824  */
2825 static void change_params(SLMP_INFO *info)
2826 {
2827         unsigned cflag;
2828         int bits_per_char;
2829
2830         if (!info->tty || !info->tty->termios)
2831                 return;
2832
2833         if (debug_level >= DEBUG_LEVEL_INFO)
2834                 printk("%s(%d):%s change_params()\n",
2835                          __FILE__,__LINE__, info->device_name );
2836
2837         cflag = info->tty->termios->c_cflag;
2838
2839         /* if B0 rate (hangup) specified then negate DTR and RTS */
2840         /* otherwise assert DTR and RTS */
2841         if (cflag & CBAUD)
2842                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2843         else
2844                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2845
2846         /* byte size and parity */
2847
2848         switch (cflag & CSIZE) {
2849               case CS5: info->params.data_bits = 5; break;
2850               case CS6: info->params.data_bits = 6; break;
2851               case CS7: info->params.data_bits = 7; break;
2852               case CS8: info->params.data_bits = 8; break;
2853               /* Never happens, but GCC is too dumb to figure it out */
2854               default:  info->params.data_bits = 7; break;
2855               }
2856
2857         if (cflag & CSTOPB)
2858                 info->params.stop_bits = 2;
2859         else
2860                 info->params.stop_bits = 1;
2861
2862         info->params.parity = ASYNC_PARITY_NONE;
2863         if (cflag & PARENB) {
2864                 if (cflag & PARODD)
2865                         info->params.parity = ASYNC_PARITY_ODD;
2866                 else
2867                         info->params.parity = ASYNC_PARITY_EVEN;
2868 #ifdef CMSPAR
2869                 if (cflag & CMSPAR)
2870                         info->params.parity = ASYNC_PARITY_SPACE;
2871 #endif
2872         }
2873
2874         /* calculate number of jiffies to transmit a full
2875          * FIFO (32 bytes) at specified data rate
2876          */
2877         bits_per_char = info->params.data_bits +
2878                         info->params.stop_bits + 1;
2879
2880         /* if port data rate is set to 460800 or less then
2881          * allow tty settings to override, otherwise keep the
2882          * current data rate.
2883          */
2884         if (info->params.data_rate <= 460800) {
2885                 info->params.data_rate = tty_get_baud_rate(info->tty);
2886         }
2887
2888         if ( info->params.data_rate ) {
2889                 info->timeout = (32*HZ*bits_per_char) /
2890                                 info->params.data_rate;
2891         }
2892         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2893
2894         if (cflag & CRTSCTS)
2895                 info->flags |= ASYNC_CTS_FLOW;
2896         else
2897                 info->flags &= ~ASYNC_CTS_FLOW;
2898
2899         if (cflag & CLOCAL)
2900                 info->flags &= ~ASYNC_CHECK_CD;
2901         else
2902                 info->flags |= ASYNC_CHECK_CD;
2903
2904         /* process tty input control flags */
2905
2906         info->read_status_mask2 = OVRN;
2907         if (I_INPCK(info->tty))
2908                 info->read_status_mask2 |= PE | FRME;
2909         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2910                 info->read_status_mask1 |= BRKD;
2911         if (I_IGNPAR(info->tty))
2912                 info->ignore_status_mask2 |= PE | FRME;
2913         if (I_IGNBRK(info->tty)) {
2914                 info->ignore_status_mask1 |= BRKD;
2915                 /* If ignoring parity and break indicators, ignore
2916                  * overruns too.  (For real raw support).
2917                  */
2918                 if (I_IGNPAR(info->tty))
2919                         info->ignore_status_mask2 |= OVRN;
2920         }
2921
2922         program_hw(info);
2923 }
2924
2925 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2926 {
2927         int err;
2928
2929         if (debug_level >= DEBUG_LEVEL_INFO)
2930                 printk("%s(%d):%s get_params()\n",
2931                          __FILE__,__LINE__, info->device_name);
2932
2933         if (!user_icount) {
2934                 memset(&info->icount, 0, sizeof(info->icount));
2935         } else {
2936                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2937                 if (err)
2938                         return -EFAULT;
2939         }
2940
2941         return 0;
2942 }
2943
2944 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2945 {
2946         int err;
2947         if (debug_level >= DEBUG_LEVEL_INFO)
2948                 printk("%s(%d):%s get_params()\n",
2949                          __FILE__,__LINE__, info->device_name);
2950
2951         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2952         if (err) {
2953                 if ( debug_level >= DEBUG_LEVEL_INFO )
2954                         printk( "%s(%d):%s get_params() user buffer copy failed\n",
2955                                 __FILE__,__LINE__,info->device_name);
2956                 return -EFAULT;
2957         }
2958
2959         return 0;
2960 }
2961
2962 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2963 {
2964         unsigned long flags;
2965         MGSL_PARAMS tmp_params;
2966         int err;
2967
2968         if (debug_level >= DEBUG_LEVEL_INFO)
2969                 printk("%s(%d):%s set_params\n",
2970                         __FILE__,__LINE__,info->device_name );
2971         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2972         if (err) {
2973                 if ( debug_level >= DEBUG_LEVEL_INFO )
2974                         printk( "%s(%d):%s set_params() user buffer copy failed\n",
2975                                 __FILE__,__LINE__,info->device_name);
2976                 return -EFAULT;
2977         }
2978
2979         spin_lock_irqsave(&info->lock,flags);
2980         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2981         spin_unlock_irqrestore(&info->lock,flags);
2982
2983         change_params(info);
2984
2985         return 0;
2986 }
2987
2988 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
2989 {
2990         int err;
2991
2992         if (debug_level >= DEBUG_LEVEL_INFO)
2993                 printk("%s(%d):%s get_txidle()=%d\n",
2994                          __FILE__,__LINE__, info->device_name, info->idle_mode);
2995
2996         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2997         if (err) {
2998                 if ( debug_level >= DEBUG_LEVEL_INFO )
2999                         printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
3000                                 __FILE__,__LINE__,info->device_name);
3001                 return -EFAULT;
3002         }
3003
3004         return 0;
3005 }
3006
3007 static int set_txidle(SLMP_INFO * info, int idle_mode)
3008 {
3009         unsigned long flags;
3010
3011         if (debug_level >= DEBUG_LEVEL_INFO)
3012                 printk("%s(%d):%s set_txidle(%d)\n",
3013                         __FILE__,__LINE__,info->device_name, idle_mode );
3014
3015         spin_lock_irqsave(&info->lock,flags);
3016         info->idle_mode = idle_mode;
3017         tx_set_idle( info );
3018         spin_unlock_irqrestore(&info->lock,flags);
3019         return 0;
3020 }
3021
3022 static int tx_enable(SLMP_INFO * info, int enable)
3023 {
3024         unsigned long flags;
3025
3026         if (debug_level >= DEBUG_LEVEL_INFO)
3027                 printk("%s(%d):%s tx_enable(%d)\n",
3028                         __FILE__,__LINE__,info->device_name, enable);
3029
3030         spin_lock_irqsave(&info->lock,flags);
3031         if ( enable ) {
3032                 if ( !info->tx_enabled ) {
3033                         tx_start(info);
3034                 }
3035         } else {
3036                 if ( info->tx_enabled )
3037                         tx_stop(info);
3038         }
3039         spin_unlock_irqrestore(&info->lock,flags);
3040         return 0;
3041 }
3042
3043 /* abort send HDLC frame
3044  */
3045 static int tx_abort(SLMP_INFO * info)
3046 {
3047         unsigned long flags;
3048
3049         if (debug_level >= DEBUG_LEVEL_INFO)
3050                 printk("%s(%d):%s tx_abort()\n",
3051                         __FILE__,__LINE__,info->device_name);
3052
3053         spin_lock_irqsave(&info->lock,flags);
3054         if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
3055                 info->ie1_value &= ~UDRN;
3056                 info->ie1_value |= IDLE;
3057                 write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
3058                 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
3059
3060                 write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
3061                 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
3062
3063                 write_reg(info, CMD, TXABORT);
3064         }
3065         spin_unlock_irqrestore(&info->lock,flags);
3066         return 0;
3067 }
3068
3069 static int rx_enable(SLMP_INFO * info, int enable)
3070 {
3071         unsigned long flags;
3072
3073         if (debug_level >= DEBUG_LEVEL_INFO)
3074                 printk("%s(%d):%s rx_enable(%d)\n",
3075                         __FILE__,__LINE__,info->device_name,enable);
3076
3077         spin_lock_irqsave(&info->lock,flags);
3078         if ( enable ) {
3079                 if ( !info->rx_enabled )
3080                         rx_start(info);
3081         } else {
3082                 if ( info->rx_enabled )
3083                         rx_stop(info);
3084         }
3085         spin_unlock_irqrestore(&info->lock,flags);
3086         return 0;
3087 }
3088
3089 /* wait for specified event to occur
3090  */
3091 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3092 {
3093         unsigned long flags;
3094         int s;
3095         int rc=0;
3096         struct mgsl_icount cprev, cnow;
3097         int events;
3098         int mask;
3099         struct  _input_signal_events oldsigs, newsigs;
3100         DECLARE_WAITQUEUE(wait, current);
3101
3102         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3103         if (rc) {
3104                 return  -EFAULT;
3105         }
3106
3107         if (debug_level >= DEBUG_LEVEL_INFO)
3108                 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3109                         __FILE__,__LINE__,info->device_name,mask);
3110
3111         spin_lock_irqsave(&info->lock,flags);
3112
3113         /* return immediately if state matches requested events */
3114         get_signals(info);
3115         s = info->serial_signals;
3116
3117         events = mask &
3118                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3119                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3120                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3121                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3122         if (events) {
3123                 spin_unlock_irqrestore(&info->lock,flags);
3124                 goto exit;
3125         }
3126
3127         /* save current irq counts */
3128         cprev = info->icount;
3129         oldsigs = info->input_signal_events;
3130
3131         /* enable hunt and idle irqs if needed */
3132         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3133                 unsigned char oldval = info->ie1_value;
3134                 unsigned char newval = oldval +
3135                          (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3136                          (mask & MgslEvent_IdleReceived ? IDLD:0);
3137                 if ( oldval != newval ) {
3138                         info->ie1_value = newval;
3139                         write_reg(info, IE1, info->ie1_value);
3140                 }
3141         }
3142
3143         set_current_state(TASK_INTERRUPTIBLE);
3144         add_wait_queue(&info->event_wait_q, &wait);
3145
3146         spin_unlock_irqrestore(&info->lock,flags);
3147
3148         for(;;) {
3149                 schedule();
3150                 if (signal_pending(current)) {
3151                         rc = -ERESTARTSYS;
3152                         break;
3153                 }
3154
3155                 /* get current irq counts */
3156                 spin_lock_irqsave(&info->lock,flags);
3157                 cnow = info->icount;
3158                 newsigs = info->input_signal_events;
3159                 set_current_state(TASK_INTERRUPTIBLE);
3160                 spin_unlock_irqrestore(&info->lock,flags);
3161
3162                 /* if no change, wait aborted for some reason */
3163                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
3164                     newsigs.dsr_down == oldsigs.dsr_down &&
3165                     newsigs.dcd_up   == oldsigs.dcd_up   &&
3166                     newsigs.dcd_down == oldsigs.dcd_down &&
3167                     newsigs.cts_up   == oldsigs.cts_up   &&
3168                     newsigs.cts_down == oldsigs.cts_down &&
3169                     newsigs.ri_up    == oldsigs.ri_up    &&
3170                     newsigs.ri_down  == oldsigs.ri_down  &&
3171                     cnow.exithunt    == cprev.exithunt   &&
3172                     cnow.rxidle      == cprev.rxidle) {
3173                         rc = -EIO;
3174                         break;
3175                 }
3176
3177                 events = mask &
3178                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
3179                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3180                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
3181                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3182                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
3183                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3184                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
3185                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
3186                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
3187                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
3188                 if (events)
3189                         break;
3190
3191                 cprev = cnow;
3192                 oldsigs = newsigs;
3193         }
3194
3195         remove_wait_queue(&info->event_wait_q, &wait);
3196         set_current_state(TASK_RUNNING);
3197
3198
3199         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3200                 spin_lock_irqsave(&info->lock,flags);
3201                 if (!waitqueue_active(&info->event_wait_q)) {
3202                         /* disable enable exit hunt mode/idle rcvd IRQs */
3203                         info->ie1_value &= ~(FLGD|IDLD);
3204                         write_reg(info, IE1, info->ie1_value);
3205                 }
3206                 spin_unlock_irqrestore(&info->lock,flags);
3207         }
3208 exit:
3209         if ( rc == 0 )
3210                 PUT_USER(rc, events, mask_ptr);
3211
3212         return rc;
3213 }
3214
3215 static int modem_input_wait(SLMP_INFO *info,int arg)
3216 {
3217         unsigned long flags;
3218         int rc;
3219         struct mgsl_icount cprev, cnow;
3220         DECLARE_WAITQUEUE(wait, current);
3221
3222         /* save current irq counts */
3223         spin_lock_irqsave(&info->lock,flags);
3224         cprev = info->icount;
3225         add_wait_queue(&info->status_event_wait_q, &wait);
3226         set_current_state(TASK_INTERRUPTIBLE);
3227         spin_unlock_irqrestore(&info->lock,flags);
3228
3229         for(;;) {
3230                 schedule();
3231                 if (signal_pending(current)) {
3232                         rc = -ERESTARTSYS;
3233                         break;
3234                 }
3235
3236                 /* get new irq counts */
3237                 spin_lock_irqsave(&info->lock,flags);
3238                 cnow = info->icount;
3239                 set_current_state(TASK_INTERRUPTIBLE);
3240                 spin_unlock_irqrestore(&info->lock,flags);
3241
3242                 /* if no change, wait aborted for some reason */
3243                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3244                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3245                         rc = -EIO;
3246                         break;
3247                 }
3248
3249                 /* check for change in caller specified modem input */
3250                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3251                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3252                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3253                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3254                         rc = 0;
3255                         break;
3256                 }
3257
3258                 cprev = cnow;
3259         }
3260         remove_wait_queue(&info->status_event_wait_q, &wait);
3261         set_current_state(TASK_RUNNING);
3262         return rc;
3263 }
3264
3265 /* return the state of the serial control and status signals
3266  */
3267 static int tiocmget(struct tty_struct *tty, struct file *file)
3268 {
3269         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3270         unsigned int result;
3271         unsigned long flags;
3272
3273         spin_lock_irqsave(&info->lock,flags);
3274         get_signals(info);
3275         spin_unlock_irqrestore(&info->lock,flags);
3276
3277         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3278                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3279                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3280                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
3281                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3282                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3283
3284         if (debug_level >= DEBUG_LEVEL_INFO)
3285                 printk("%s(%d):%s tiocmget() value=%08X\n",
3286                          __FILE__,__LINE__, info->device_name, result );
3287         return result;
3288 }
3289
3290 /* set modem control signals (DTR/RTS)
3291  */
3292 static int tiocmset(struct tty_struct *tty, struct file *file,
3293                     unsigned int set, unsigned int clear)
3294 {
3295         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3296         unsigned long flags;
3297
3298         if (debug_level >= DEBUG_LEVEL_INFO)
3299                 printk("%s(%d):%s tiocmset(%x,%x)\n",
3300                         __FILE__,__LINE__,info->device_name, set, clear);
3301
3302         if (set & TIOCM_RTS)
3303                 info->serial_signals |= SerialSignal_RTS;
3304         if (set & TIOCM_DTR)
3305                 info->serial_signals |= SerialSignal_DTR;
3306         if (clear & TIOCM_RTS)
3307                 info->serial_signals &= ~SerialSignal_RTS;
3308         if (clear & TIOCM_DTR)
3309                 info->serial_signals &= ~SerialSignal_DTR;
3310
3311         spin_lock_irqsave(&info->lock,flags);
3312         set_signals(info);
3313         spin_unlock_irqrestore(&info->lock,flags);
3314
3315         return 0;
3316 }
3317
3318
3319
3320 /* Block the current process until the specified port is ready to open.
3321  */
3322 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3323                            SLMP_INFO *info)
3324 {
3325         DECLARE_WAITQUEUE(wait, current);
3326         int             retval;
3327         int             do_clocal = 0, extra_count = 0;
3328         unsigned long   flags;
3329
3330         if (debug_level >= DEBUG_LEVEL_INFO)
3331                 printk("%s(%d):%s block_til_ready()\n",
3332                          __FILE__,__LINE__, tty->driver->name );
3333
3334         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3335                 /* nonblock mode is set or port is not enabled */
3336                 /* just verify that callout device is not active */
3337                 info->flags |= ASYNC_NORMAL_ACTIVE;
3338                 return 0;
3339         }
3340
3341         if (tty->termios->c_cflag & CLOCAL)
3342                 do_clocal = 1;
3343
3344         /* Wait for carrier detect and the line to become
3345          * free (i.e., not in use by the callout).  While we are in
3346          * this loop, info->count is dropped by one, so that
3347          * close() knows when to free things.  We restore it upon
3348          * exit, either normal or abnormal.
3349          */
3350
3351         retval = 0;
3352         add_wait_queue(&info->open_wait, &wait);
3353
3354         if (debug_level >= DEBUG_LEVEL_INFO)
3355                 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3356                          __FILE__,__LINE__, tty->driver->name, info->count );
3357
3358         spin_lock_irqsave(&info->lock, flags);
3359         if (!tty_hung_up_p(filp)) {
3360                 extra_count = 1;
3361                 info->count--;
3362         }
3363         spin_unlock_irqrestore(&info->lock, flags);
3364         info->blocked_open++;
3365
3366         while (1) {
3367                 if ((tty->termios->c_cflag & CBAUD)) {
3368                         spin_lock_irqsave(&info->lock,flags);
3369                         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3370                         set_signals(info);
3371                         spin_unlock_irqrestore(&info->lock,flags);
3372                 }
3373
3374                 set_current_state(TASK_INTERRUPTIBLE);
3375
3376                 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
3377                         retval = (info->flags & ASYNC_HUP_NOTIFY) ?
3378                                         -EAGAIN : -ERESTARTSYS;
3379                         break;
3380                 }
3381
3382                 spin_lock_irqsave(&info->lock,flags);
3383                 get_signals(info);
3384                 spin_unlock_irqrestore(&info->lock,flags);
3385
3386                 if (!(info->flags & ASYNC_CLOSING) &&
3387                     (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
3388                         break;
3389                 }
3390
3391                 if (signal_pending(current)) {
3392                         retval = -ERESTARTSYS;
3393                         break;
3394                 }
3395
3396                 if (debug_level >= DEBUG_LEVEL_INFO)
3397                         printk("%s(%d):%s block_til_ready() count=%d\n",
3398                                  __FILE__,__LINE__, tty->driver->name, info->count );
3399
3400                 schedule();
3401         }
3402
3403         set_current_state(TASK_RUNNING);
3404         remove_wait_queue(&info->open_wait, &wait);
3405
3406         if (extra_count)
3407                 info->count++;
3408         info->blocked_open--;
3409
3410         if (debug_level >= DEBUG_LEVEL_INFO)
3411                 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3412                          __FILE__,__LINE__, tty->driver->name, info->count );
3413
3414         if (!retval)
3415                 info->flags |= ASYNC_NORMAL_ACTIVE;
3416
3417         return retval;
3418 }
3419
3420 int alloc_dma_bufs(SLMP_INFO *info)
3421 {
3422         unsigned short BuffersPerFrame;
3423         unsigned short BufferCount;
3424
3425         // Force allocation to start at 64K boundary for each port.
3426         // This is necessary because *all* buffer descriptors for a port
3427         // *must* be in the same 64K block. All descriptors on a port
3428         // share a common 'base' address (upper 8 bits of 24 bits) programmed
3429         // into the CBP register.
3430         info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3431
3432         /* Calculate the number of DMA buffers necessary to hold the */
3433         /* largest allowable frame size. Note: If the max frame size is */
3434         /* not an even multiple of the DMA buffer size then we need to */
3435         /* round the buffer count per frame up one. */
3436
3437         BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3438         if ( info->max_frame_size % SCABUFSIZE )
3439                 BuffersPerFrame++;
3440
3441         /* calculate total number of data buffers (SCABUFSIZE) possible
3442          * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3443          * for the descriptor list (BUFFERLISTSIZE).
3444          */
3445         BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3446
3447         /* limit number of buffers to maximum amount of descriptors */
3448         if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3449                 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3450
3451         /* use enough buffers to transmit one max size frame */
3452         info->tx_buf_count = BuffersPerFrame + 1;
3453
3454         /* never use more than half the available buffers for transmit */
3455         if (info->tx_buf_count > (BufferCount/2))
3456                 info->tx_buf_count = BufferCount/2;
3457
3458         if (info->tx_buf_count > SCAMAXDESC)
3459                 info->tx_buf_count = SCAMAXDESC;
3460
3461         /* use remaining buffers for receive */
3462         info->rx_buf_count = BufferCount - info->tx_buf_count;
3463
3464         if (info->rx_buf_count > SCAMAXDESC)
3465                 info->rx_buf_count = SCAMAXDESC;
3466
3467         if ( debug_level >= DEBUG_LEVEL_INFO )
3468                 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3469                         __FILE__,__LINE__, info->device_name,
3470                         info->tx_buf_count,info->rx_buf_count);
3471
3472         if ( alloc_buf_list( info ) < 0 ||
3473                 alloc_frame_bufs(info,
3474                                         info->rx_buf_list,
3475                                         info->rx_buf_list_ex,
3476                                         info->rx_buf_count) < 0 ||
3477                 alloc_frame_bufs(info,
3478                                         info->tx_buf_list,
3479                                         info->tx_buf_list_ex,
3480                                         info->tx_buf_count) < 0 ||
3481                 alloc_tmp_rx_buf(info) < 0 ) {
3482                 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3483                         __FILE__,__LINE__, info->device_name);
3484                 return -ENOMEM;
3485         }
3486
3487         rx_reset_buffers( info );
3488
3489         return 0;
3490 }
3491
3492 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3493  */
3494 int alloc_buf_list(SLMP_INFO *info)
3495 {
3496         unsigned int i;
3497
3498         /* build list in adapter shared memory */
3499         info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3500         info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3501         info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3502
3503         memset(info->buffer_list, 0, BUFFERLISTSIZE);
3504
3505         /* Save virtual address pointers to the receive and */
3506         /* transmit buffer lists. (Receive 1st). These pointers will */
3507         /* be used by the processor to access the lists. */
3508         info->rx_buf_list = (SCADESC *)info->buffer_list;
3509
3510         info->tx_buf_list = (SCADESC *)info->buffer_list;
3511         info->tx_buf_list += info->rx_buf_count;
3512
3513         /* Build links for circular buffer entry lists (tx and rx)
3514          *
3515          * Note: links are physical addresses read by the SCA device
3516          * to determine the next buffer entry to use.
3517          */
3518
3519         for ( i = 0; i < info->rx_buf_count; i++ ) {
3520                 /* calculate and store physical address of this buffer entry */
3521                 info->rx_buf_list_ex[i].phys_entry =
3522                         info->buffer_list_phys + (i * sizeof(SCABUFSIZE));
3523
3524                 /* calculate and store physical address of */
3525                 /* next entry in cirular list of entries */
3526                 info->rx_buf_list[i].next = info->buffer_list_phys;
3527                 if ( i < info->rx_buf_count - 1 )
3528                         info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3529
3530                 info->rx_buf_list[i].length = SCABUFSIZE;
3531         }
3532
3533         for ( i = 0; i < info->tx_buf_count; i++ ) {
3534                 /* calculate and store physical address of this buffer entry */
3535                 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3536                         ((info->rx_buf_count + i) * sizeof(SCADESC));
3537
3538                 /* calculate and store physical address of */
3539                 /* next entry in cirular list of entries */
3540
3541                 info->tx_buf_list[i].next = info->buffer_list_phys +
3542                         info->rx_buf_count * sizeof(SCADESC);
3543
3544                 if ( i < info->tx_buf_count - 1 )
3545                         info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3546         }
3547
3548         return 0;
3549 }
3550
3551 /* Allocate the frame DMA buffers used by the specified buffer list.
3552  */
3553 int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3554 {
3555         int i;
3556         unsigned long phys_addr;
3557
3558         for ( i = 0; i < count; i++ ) {
3559                 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3560                 phys_addr = info->port_array[0]->last_mem_alloc;
3561                 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3562
3563                 buf_list[i].buf_ptr  = (unsigned short)phys_addr;
3564                 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3565         }
3566
3567         return 0;
3568 }
3569
3570 void free_dma_bufs(SLMP_INFO *info)
3571 {
3572         info->buffer_list = NULL;
3573         info->rx_buf_list = NULL;
3574         info->tx_buf_list = NULL;
3575 }
3576
3577 /* allocate buffer large enough to hold max_frame_size.
3578  * This buffer is used to pass an assembled frame to the line discipline.
3579  */
3580 int alloc_tmp_rx_buf(SLMP_INFO *info)
3581 {
3582         info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3583         if (info->tmp_rx_buf == NULL)
3584                 return -ENOMEM;
3585         return 0;
3586 }
3587
3588 void free_tmp_rx_buf(SLMP_INFO *info)
3589 {
3590         kfree(info->tmp_rx_buf);
3591         info->tmp_rx_buf = NULL;
3592 }
3593
3594 int claim_resources(SLMP_INFO *info)
3595 {
3596         if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3597                 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3598                         __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3599                 info->init_error = DiagStatus_AddressConflict;
3600                 goto errout;
3601         }
3602         else
3603                 info->shared_mem_requested = 1;
3604
3605         if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3606                 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3607                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3608                 info->init_error = DiagStatus_AddressConflict;
3609                 goto errout;
3610         }
3611         else
3612                 info->lcr_mem_requested = 1;
3613
3614         if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3615                 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3616                         __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3617                 info->init_error = DiagStatus_AddressConflict;
3618                 goto errout;
3619         }
3620         else
3621                 info->sca_base_requested = 1;
3622
3623         if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3624                 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3625                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3626                 info->init_error = DiagStatus_AddressConflict;
3627                 goto errout;
3628         }
3629         else
3630                 info->sca_statctrl_requested = 1;
3631
3632         info->memory_base = ioremap(info->phys_memory_base,SCA_MEM_SIZE);
3633         if (!info->memory_base) {
3634                 printk( "%s(%d):%s Cant map shared memory, MemAddr=%08X\n",
3635                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3636                 info->init_error = DiagStatus_CantAssignPciResources;
3637                 goto errout;
3638         }
3639
3640         info->lcr_base = ioremap(info->phys_lcr_base,PAGE_SIZE);
3641         if (!info->lcr_base) {
3642                 printk( "%s(%d):%s Cant map LCR memory, MemAddr=%08X\n",
3643                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3644                 info->init_error = DiagStatus_CantAssignPciResources;
3645                 goto errout;
3646         }
3647         info->lcr_base += info->lcr_offset;
3648
3649         info->sca_base = ioremap(info->phys_sca_base,PAGE_SIZE);
3650         if (!info->sca_base) {
3651                 printk( "%s(%d):%s Cant map SCA memory, MemAddr=%08X\n",
3652                         __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3653                 info->init_error = DiagStatus_CantAssignPciResources;
3654                 goto errout;
3655         }
3656         info->sca_base += info->sca_offset;
3657
3658         info->statctrl_base = ioremap(info->phys_statctrl_base,PAGE_SIZE);
3659         if (!info->statctrl_base) {
3660                 printk( "%s(%d):%s Cant map SCA Status/Control memory, MemAddr=%08X\n",
3661                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3662                 info->init_error = DiagStatus_CantAssignPciResources;
3663                 goto errout;
3664         }
3665         info->statctrl_base += info->statctrl_offset;
3666
3667         if ( !memory_test(info) ) {
3668                 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3669                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3670                 info->init_error = DiagStatus_MemoryError;
3671                 goto errout;
3672         }
3673
3674         return 0;
3675
3676 errout:
3677         release_resources( info );
3678         return -ENODEV;
3679 }
3680
3681 void release_resources(SLMP_INFO *info)
3682 {
3683         if ( debug_level >= DEBUG_LEVEL_INFO )
3684                 printk( "%s(%d):%s release_resources() entry\n",
3685                         __FILE__,__LINE__,info->device_name );
3686
3687         if ( info->irq_requested ) {
3688                 free_irq(info->irq_level, info);
3689                 info->irq_requested = 0;
3690         }
3691
3692         if ( info->shared_mem_requested ) {
3693                 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3694                 info->shared_mem_requested = 0;
3695         }
3696         if ( info->lcr_mem_requested ) {
3697                 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3698                 info->lcr_mem_requested = 0;
3699         }
3700         if ( info->sca_base_requested ) {
3701                 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3702                 info->sca_base_requested = 0;
3703         }
3704         if ( info->sca_statctrl_requested ) {
3705                 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3706                 info->sca_statctrl_requested = 0;
3707         }
3708
3709         if (info->memory_base){
3710                 iounmap(info->memory_base);
3711                 info->memory_base = NULL;
3712         }
3713
3714         if (info->sca_base) {
3715                 iounmap(info->sca_base - info->sca_offset);
3716                 info->sca_base=NULL;
3717         }
3718
3719         if (info->statctrl_base) {
3720                 iounmap(info->statctrl_base - info->statctrl_offset);
3721                 info->statctrl_base=NULL;
3722         }
3723
3724         if (info->lcr_base){
3725                 iounmap(info->lcr_base - info->lcr_offset);
3726                 info->lcr_base = NULL;
3727         }
3728
3729         if ( debug_level >= DEBUG_LEVEL_INFO )
3730                 printk( "%s(%d):%s release_resources() exit\n",
3731                         __FILE__,__LINE__,info->device_name );
3732 }
3733
3734 /* Add the specified device instance data structure to the
3735  * global linked list of devices and increment the device count.
3736  */
3737 void add_device(SLMP_INFO *info)
3738 {
3739         info->next_device = NULL;
3740         info->line = synclinkmp_device_count;
3741         sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3742
3743         if (info->line < MAX_DEVICES) {
3744                 if (maxframe[info->line])
3745                         info->max_frame_size = maxframe[info->line];
3746                 info->dosyncppp = dosyncppp[info->line];
3747         }
3748
3749         synclinkmp_device_count++;
3750
3751         if ( !synclinkmp_device_list )
3752                 synclinkmp_device_list = info;
3753         else {
3754                 SLMP_INFO *current_dev = synclinkmp_device_list;
3755                 while( current_dev->next_device )
3756                         current_dev = current_dev->next_device;
3757                 current_dev->next_device = info;
3758         }
3759
3760         if ( info->max_frame_size < 4096 )
3761                 info->max_frame_size = 4096;
3762         else if ( info->max_frame_size > 65535 )
3763                 info->max_frame_size = 65535;
3764
3765         printk( "SyncLink MultiPort %s: "
3766                 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3767                 info->device_name,
3768                 info->phys_sca_base,
3769                 info->phys_memory_base,
3770                 info->phys_statctrl_base,
3771                 info->phys_lcr_base,
3772                 info->irq_level,
3773                 info->max_frame_size );
3774
3775 #if SYNCLINK_GENERIC_HDLC
3776         hdlcdev_init(info);
3777 #endif
3778 }
3779
3780 /* Allocate and initialize a device instance structure
3781  *
3782  * Return Value:        pointer to SLMP_INFO if success, otherwise NULL
3783  */
3784 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3785 {
3786         SLMP_INFO *info;
3787
3788         info = kzalloc(sizeof(SLMP_INFO),
3789                  GFP_KERNEL);
3790
3791         if (!info) {
3792                 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3793                         __FILE__,__LINE__, adapter_num, port_num);
3794         } else {
3795                 info->magic = MGSL_MAGIC;
3796                 INIT_WORK(&info->task, bh_handler);
3797                 info->max_frame_size = 4096;
3798                 info->close_delay = 5*HZ/10;
3799                 info->closing_wait = 30*HZ;
3800                 init_waitqueue_head(&info->open_wait);
3801                 init_waitqueue_head(&info->close_wait);
3802                 init_waitqueue_head(&info->status_event_wait_q);
3803                 init_waitqueue_head(&info->event_wait_q);
3804                 spin_lock_init(&info->netlock);
3805                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3806                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3807                 info->adapter_num = adapter_num;
3808                 info->port_num = port_num;
3809
3810                 /* Copy configuration info to device instance data */
3811                 info->irq_level = pdev->irq;
3812                 info->phys_lcr_base = pci_resource_start(pdev,0);
3813                 info->phys_sca_base = pci_resource_start(pdev,2);
3814                 info->phys_memory_base = pci_resource_start(pdev,3);
3815                 info->phys_statctrl_base = pci_resource_start(pdev,4);
3816
3817                 /* Because veremap only works on page boundaries we must map
3818                  * a larger area than is actually implemented for the LCR
3819                  * memory range. We map a full page starting at the page boundary.
3820                  */
3821                 info->lcr_offset    = info->phys_lcr_base & (PAGE_SIZE-1);
3822                 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3823
3824                 info->sca_offset    = info->phys_sca_base & (PAGE_SIZE-1);
3825                 info->phys_sca_base &= ~(PAGE_SIZE-1);
3826
3827                 info->statctrl_offset    = info->phys_statctrl_base & (PAGE_SIZE-1);
3828                 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3829
3830                 info->bus_type = MGSL_BUS_TYPE_PCI;
3831                 info->irq_flags = IRQF_SHARED;
3832
3833                 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3834                 setup_timer(&info->status_timer, status_timeout,
3835                                 (unsigned long)info);
3836
3837                 /* Store the PCI9050 misc control register value because a flaw
3838                  * in the PCI9050 prevents LCR registers from being read if
3839                  * BIOS assigns an LCR base address with bit 7 set.
3840                  *
3841                  * Only the misc control register is accessed for which only
3842                  * write access is needed, so set an initial value and change
3843                  * bits to the device instance data as we write the value
3844                  * to the actual misc control register.
3845                  */
3846                 info->misc_ctrl_value = 0x087e4546;
3847
3848                 /* initial port state is unknown - if startup errors
3849                  * occur, init_error will be set to indicate the
3850                  * problem. Once the port is fully initialized,
3851                  * this value will be set to 0 to indicate the
3852                  * port is available.
3853                  */
3854                 info->init_error = -1;
3855         }
3856
3857         return info;
3858 }
3859
3860 void device_init(int adapter_num, struct pci_dev *pdev)
3861 {
3862         SLMP_INFO *port_array[SCA_MAX_PORTS];
3863         int port;
3864
3865         /* allocate device instances for up to SCA_MAX_PORTS devices */
3866         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3867                 port_array[port] = alloc_dev(adapter_num,port,pdev);
3868                 if( port_array[port] == NULL ) {
3869                         for ( --port; port >= 0; --port )
3870                                 kfree(port_array[port]);
3871                         return;
3872                 }
3873         }
3874
3875         /* give copy of port_array to all ports and add to device list  */
3876         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3877                 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3878                 add_device( port_array[port] );
3879                 spin_lock_init(&port_array[port]->lock);
3880         }
3881
3882         /* Allocate and claim adapter resources */
3883         if ( !claim_resources(port_array[0]) ) {
3884
3885                 alloc_dma_bufs(port_array[0]);
3886
3887                 /* copy resource information from first port to others */
3888                 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3889                         port_array[port]->lock  = port_array[0]->lock;
3890                         port_array[port]->irq_level     = port_array[0]->irq_level;
3891                         port_array[port]->memory_base   = port_array[0]->memory_base;
3892                         port_array[port]->sca_base      = port_array[0]->sca_base;
3893                         port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3894                         port_array[port]->lcr_base      = port_array[0]->lcr_base;
3895                         alloc_dma_bufs(port_array[port]);
3896                 }
3897
3898                 if ( request_irq(port_array[0]->irq_level,
3899                                         synclinkmp_interrupt,
3900                                         port_array[0]->irq_flags,
3901                                         port_array[0]->device_name,
3902                                         port_array[0]) < 0 ) {
3903                         printk( "%s(%d):%s Cant request interrupt, IRQ=%d\n",
3904                                 __FILE__,__LINE__,
3905                                 port_array[0]->device_name,
3906                                 port_array[0]->irq_level );
3907                 }
3908                 else {
3909                         port_array[0]->irq_requested = 1;
3910                         adapter_test(port_array[0]);
3911                 }
3912         }
3913 }
3914
3915 static const struct tty_operations ops = {
3916         .open = open,
3917         .close = close,
3918         .write = write,
3919         .put_char = put_char,
3920         .flush_chars = flush_chars,
3921         .write_room = write_room,
3922         .chars_in_buffer = chars_in_buffer,
3923         .flush_buffer = flush_buffer,
3924         .ioctl = ioctl,
3925         .throttle = throttle,
3926         .unthrottle = unthrottle,
3927         .send_xchar = send_xchar,
3928         .break_ctl = set_break,
3929         .wait_until_sent = wait_until_sent,
3930         .read_proc = read_proc,
3931         .set_termios = set_termios,
3932         .stop = tx_hold,
3933         .start = tx_release,
3934         .hangup = hangup,
3935         .tiocmget = tiocmget,
3936         .tiocmset = tiocmset,
3937 };
3938
3939 static void synclinkmp_cleanup(void)
3940 {
3941         int rc;
3942         SLMP_INFO *info;
3943         SLMP_INFO *tmp;
3944
3945         printk("Unloading %s %s\n", driver_name, driver_version);
3946
3947         if (serial_driver) {
3948                 if ((rc = tty_unregister_driver(serial_driver)))
3949                         printk("%s(%d) failed to unregister tty driver err=%d\n",
3950                                __FILE__,__LINE__,rc);
3951                 put_tty_driver(serial_driver);
3952         }
3953
3954         /* reset devices */
3955         info = synclinkmp_device_list;
3956         while(info) {
3957                 reset_port(info);
3958                 info = info->next_device;
3959         }
3960
3961         /* release devices */
3962         info = synclinkmp_device_list;
3963         while(info) {
3964 #if SYNCLINK_GENERIC_HDLC
3965                 hdlcdev_exit(info);
3966 #endif
3967                 free_dma_bufs(info);
3968                 free_tmp_rx_buf(info);
3969                 if ( info->port_num == 0 ) {
3970                         if (info->sca_base)
3971                                 write_reg(info, LPR, 1); /* set low power mode */
3972                         release_resources(info);
3973                 }
3974                 tmp = info;
3975                 info = info->next_device;
3976                 kfree(tmp);
3977         }
3978
3979         pci_unregister_driver(&synclinkmp_pci_driver);
3980 }
3981
3982 /* Driver initialization entry point.
3983  */
3984
3985 static int __init synclinkmp_init(void)
3986 {
3987         int rc;
3988
3989         if (break_on_load) {
3990                 synclinkmp_get_text_ptr();
3991                 BREAKPOINT();
3992         }
3993
3994         printk("%s %s\n", driver_name, driver_version);
3995
3996         if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
3997                 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
3998                 return rc;
3999         }
4000
4001         serial_driver = alloc_tty_driver(128);
4002         if (!serial_driver) {
4003                 rc = -ENOMEM;
4004                 goto error;
4005         }
4006
4007         /* Initialize the tty_driver structure */
4008
4009         serial_driver->owner = THIS_MODULE;
4010         serial_driver->driver_name = "synclinkmp";
4011         serial_driver->name = "ttySLM";
4012         serial_driver->major = ttymajor;
4013         serial_driver->minor_start = 64;
4014         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4015         serial_driver->subtype = SERIAL_TYPE_NORMAL;
4016         serial_driver->init_termios = tty_std_termios;
4017         serial_driver->init_termios.c_cflag =
4018                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4019         serial_driver->init_termios.c_ispeed = 9600;
4020         serial_driver->init_termios.c_ospeed = 9600;
4021         serial_driver->flags = TTY_DRIVER_REAL_RAW;
4022         tty_set_operations(serial_driver, &ops);
4023         if ((rc = tty_register_driver(serial_driver)) < 0) {
4024                 printk("%s(%d):Couldn't register serial driver\n",
4025                         __FILE__,__LINE__);
4026                 put_tty_driver(serial_driver);
4027                 serial_driver = NULL;
4028                 goto error;
4029         }
4030
4031         printk("%s %s, tty major#%d\n",
4032                 driver_name, driver_version,
4033                 serial_driver->major);
4034
4035         return 0;
4036
4037 error:
4038         synclinkmp_cleanup();
4039         return rc;
4040 }
4041
4042 static void __exit synclinkmp_exit(void)
4043 {
4044         synclinkmp_cleanup();
4045 }
4046
4047 module_init(synclinkmp_init);
4048 module_exit(synclinkmp_exit);
4049
4050 /* Set the port for internal loopback mode.
4051  * The TxCLK and RxCLK signals are generated from the BRG and
4052  * the TxD is looped back to the RxD internally.
4053  */
4054 void enable_loopback(SLMP_INFO *info, int enable)
4055 {
4056         if (enable) {
4057                 /* MD2 (Mode Register 2)
4058                  * 01..00  CNCT<1..0> Channel Connection 11=Local Loopback
4059                  */
4060                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4061
4062                 /* degate external TxC clock source */
4063                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4064                 write_control_reg(info);
4065
4066                 /* RXS/TXS (Rx/Tx clock source)
4067                  * 07      Reserved, must be 0
4068                  * 06..04  Clock Source, 100=BRG
4069                  * 03..00  Clock Divisor, 0000=1
4070                  */
4071                 write_reg(info, RXS, 0x40);
4072                 write_reg(info, TXS, 0x40);
4073
4074         } else {
4075                 /* MD2 (Mode Register 2)
4076                  * 01..00  CNCT<1..0> Channel connection, 0=normal
4077                  */
4078                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4079
4080                 /* RXS/TXS (Rx/Tx clock source)
4081                  * 07      Reserved, must be 0
4082                  * 06..04  Clock Source, 000=RxC/TxC Pin
4083                  * 03..00  Clock Divisor, 0000=1
4084                  */
4085                 write_reg(info, RXS, 0x00);
4086                 write_reg(info, TXS, 0x00);
4087         }
4088
4089         /* set LinkSpeed if available, otherwise default to 2Mbps */
4090         if (info->params.clock_speed)
4091                 set_rate(info, info->params.clock_speed);
4092         else
4093                 set_rate(info, 3686400);
4094 }
4095
4096 /* Set the baud rate register to the desired speed
4097  *
4098  *      data_rate       data rate of clock in bits per second
4099  *                      A data rate of 0 disables the AUX clock.
4100  */
4101 void set_rate( SLMP_INFO *info, u32 data_rate )
4102 {
4103         u32 TMCValue;
4104         unsigned char BRValue;
4105         u32 Divisor=0;
4106
4107         /* fBRG = fCLK/(TMC * 2^BR)
4108          */
4109         if (data_rate != 0) {
4110                 Divisor = 14745600/data_rate;
4111                 if (!Divisor)
4112                         Divisor = 1;
4113
4114                 TMCValue = Divisor;
4115
4116                 BRValue = 0;
4117                 if (TMCValue != 1 && TMCValue != 2) {
4118                         /* BRValue of 0 provides 50/50 duty cycle *only* when
4119                          * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4120                          * 50/50 duty cycle.
4121                          */
4122                         BRValue = 1;
4123                         TMCValue >>= 1;
4124                 }
4125
4126                 /* while TMCValue is too big for TMC register, divide
4127                  * by 2 and increment BR exponent.
4128                  */
4129                 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4130                         TMCValue >>= 1;
4131
4132                 write_reg(info, TXS,
4133                         (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4134                 write_reg(info, RXS,
4135                         (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4136                 write_reg(info, TMC, (unsigned char)TMCValue);
4137         }
4138         else {
4139                 write_reg(info, TXS,0);
4140                 write_reg(info, RXS,0);
4141                 write_reg(info, TMC, 0);
4142         }
4143 }
4144
4145 /* Disable receiver
4146  */
4147 void rx_stop(SLMP_INFO *info)
4148 {
4149         if (debug_level >= DEBUG_LEVEL_ISR)
4150                 printk("%s(%d):%s rx_stop()\n",
4151                          __FILE__,__LINE__, info->device_name );
4152
4153         write_reg(info, CMD, RXRESET);
4154
4155         info->ie0_value &= ~RXRDYE;
4156         write_reg(info, IE0, info->ie0_value);  /* disable Rx data interrupts */
4157
4158         write_reg(info, RXDMA + DSR, 0);        /* disable Rx DMA */
4159         write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4160         write_reg(info, RXDMA + DIR, 0);        /* disable Rx DMA interrupts */
4161
4162         info->rx_enabled = 0;
4163         info->rx_overflow = 0;
4164 }
4165
4166 /* enable the receiver
4167  */
4168 void rx_start(SLMP_INFO *info)
4169 {
4170         int i;
4171
4172         if (debug_level >= DEBUG_LEVEL_ISR)
4173                 printk("%s(%d):%s rx_start()\n",
4174                          __FILE__,__LINE__, info->device_name );
4175
4176         write_reg(info, CMD, RXRESET);
4177
4178         if ( info->params.mode == MGSL_MODE_HDLC ) {
4179                 /* HDLC, disabe IRQ on rxdata */
4180                 info->ie0_value &= ~RXRDYE;
4181                 write_reg(info, IE0, info->ie0_value);
4182
4183                 /* Reset all Rx DMA buffers and program rx dma */
4184                 write_reg(info, RXDMA + DSR, 0);                /* disable Rx DMA */
4185                 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4186
4187                 for (i = 0; i < info->rx_buf_count; i++) {
4188                         info->rx_buf_list[i].status = 0xff;
4189
4190                         // throttle to 4 shared memory writes at a time to prevent
4191                         // hogging local bus (keep latency time for DMA requests low).
4192                         if (!(i % 4))
4193                                 read_status_reg(info);
4194                 }
4195                 info->current_rx_buf = 0;
4196
4197                 /* set current/1st descriptor address */
4198                 write_reg16(info, RXDMA + CDA,
4199                         info->rx_buf_list_ex[0].phys_entry);
4200
4201                 /* set new last rx descriptor address */
4202                 write_reg16(info, RXDMA + EDA,
4203                         info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4204
4205                 /* set buffer length (shared by all rx dma data buffers) */
4206                 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4207
4208                 write_reg(info, RXDMA + DIR, 0x60);     /* enable Rx DMA interrupts (EOM/BOF) */
4209                 write_reg(info, RXDMA + DSR, 0xf2);     /* clear Rx DMA IRQs, enable Rx DMA */
4210         } else {
4211                 /* async, enable IRQ on rxdata */
4212                 info->ie0_value |= RXRDYE;
4213                 write_reg(info, IE0, info->ie0_value);
4214         }
4215
4216         write_reg(info, CMD, RXENABLE);
4217
4218         info->rx_overflow = FALSE;
4219         info->rx_enabled = 1;
4220 }
4221
4222 /* Enable the transmitter and send a transmit frame if
4223  * one is loaded in the DMA buffers.
4224  */
4225 void tx_start(SLMP_INFO *info)
4226 {
4227         if (debug_level >= DEBUG_LEVEL_ISR)
4228                 printk("%s(%d):%s tx_start() tx_count=%d\n",
4229                          __FILE__,__LINE__, info->device_name,info->tx_count );
4230
4231         if (!info->tx_enabled ) {
4232                 write_reg(info, CMD, TXRESET);
4233                 write_reg(info, CMD, TXENABLE);
4234                 info->tx_enabled = TRUE;
4235         }
4236
4237         if ( info->tx_count ) {
4238
4239                 /* If auto RTS enabled and RTS is inactive, then assert */
4240                 /* RTS and set a flag indicating that the driver should */
4241                 /* negate RTS when the transmission completes. */
4242
4243                 info->drop_rts_on_tx_done = 0;
4244
4245                 if (info->params.mode != MGSL_MODE_ASYNC) {
4246
4247                         if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4248                                 get_signals( info );
4249                                 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4250                                         info->serial_signals |= SerialSignal_RTS;
4251                                         set_signals( info );
4252                                         info->drop_rts_on_tx_done = 1;
4253                                 }
4254                         }
4255
4256                         write_reg16(info, TRC0,
4257                                 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4258
4259                         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4260                         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4261         
4262                         /* set TX CDA (current descriptor address) */
4263                         write_reg16(info, TXDMA + CDA,
4264                                 info->tx_buf_list_ex[0].phys_entry);
4265         
4266                         /* set TX EDA (last descriptor address) */
4267                         write_reg16(info, TXDMA + EDA,
4268                                 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4269         
4270                         /* enable underrun IRQ */
4271                         info->ie1_value &= ~IDLE;
4272                         info->ie1_value |= UDRN;
4273                         write_reg(info, IE1, info->ie1_value);
4274                         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4275         
4276                         write_reg(info, TXDMA + DIR, 0x40);             /* enable Tx DMA interrupts (EOM) */
4277                         write_reg(info, TXDMA + DSR, 0xf2);             /* clear Tx DMA IRQs, enable Tx DMA */
4278         
4279                         mod_timer(&info->tx_timer, jiffies +
4280                                         msecs_to_jiffies(5000));
4281                 }
4282                 else {
4283                         tx_load_fifo(info);
4284                         /* async, enable IRQ on txdata */
4285                         info->ie0_value |= TXRDYE;
4286                         write_reg(info, IE0, info->ie0_value);
4287                 }
4288
4289                 info->tx_active = 1;
4290         }
4291 }
4292
4293 /* stop the transmitter and DMA
4294  */
4295 void tx_stop( SLMP_INFO *info )
4296 {
4297         if (debug_level >= DEBUG_LEVEL_ISR)
4298                 printk("%s(%d):%s tx_stop()\n",
4299                          __FILE__,__LINE__, info->device_name );
4300
4301         del_timer(&info->tx_timer);
4302
4303         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4304         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4305
4306         write_reg(info, CMD, TXRESET);
4307
4308         info->ie1_value &= ~(UDRN + IDLE);
4309         write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
4310         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
4311
4312         info->ie0_value &= ~TXRDYE;
4313         write_reg(info, IE0, info->ie0_value);  /* disable tx data interrupts */
4314
4315         info->tx_enabled = 0;
4316         info->tx_active  = 0;
4317 }
4318
4319 /* Fill the transmit FIFO until the FIFO is full or
4320  * there is no more data to load.
4321  */
4322 void tx_load_fifo(SLMP_INFO *info)
4323 {
4324         u8 TwoBytes[2];
4325
4326         /* do nothing is now tx data available and no XON/XOFF pending */
4327
4328         if ( !info->tx_count && !info->x_char )
4329                 return;
4330
4331         /* load the Transmit FIFO until FIFOs full or all data sent */
4332
4333         while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4334
4335                 /* there is more space in the transmit FIFO and */
4336                 /* there is more data in transmit buffer */
4337
4338                 if ( (info->tx_count > 1) && !info->x_char ) {
4339                         /* write 16-bits */
4340                         TwoBytes[0] = info->tx_buf[info->tx_get++];
4341                         if (info->tx_get >= info->max_frame_size)
4342                                 info->tx_get -= info->max_frame_size;
4343                         TwoBytes[1] = info->tx_buf[info->tx_get++];
4344                         if (info->tx_get >= info->max_frame_size)
4345                                 info->tx_get -= info->max_frame_size;
4346
4347                         write_reg16(info, TRB, *((u16 *)TwoBytes));
4348
4349                         info->tx_count -= 2;
4350                         info->icount.tx += 2;
4351                 } else {
4352                         /* only 1 byte left to transmit or 1 FIFO slot left */
4353
4354                         if (info->x_char) {
4355                                 /* transmit pending high priority char */
4356                                 write_reg(info, TRB, info->x_char);
4357                                 info->x_char = 0;
4358                         } else {
4359                                 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4360                                 if (info->tx_get >= info->max_frame_size)
4361                                         info->tx_get -= info->max_frame_size;
4362                                 info->tx_count--;
4363                         }
4364                         info->icount.tx++;
4365                 }
4366         }
4367 }
4368
4369 /* Reset a port to a known state
4370  */
4371 void reset_port(SLMP_INFO *info)
4372 {
4373         if (info->sca_base) {
4374
4375                 tx_stop(info);
4376                 rx_stop(info);
4377
4378                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
4379                 set_signals(info);
4380
4381                 /* disable all port interrupts */
4382                 info->ie0_value = 0;
4383                 info->ie1_value = 0;
4384                 info->ie2_value = 0;
4385                 write_reg(info, IE0, info->ie0_value);
4386                 write_reg(info, IE1, info->ie1_value);
4387                 write_reg(info, IE2, info->ie2_value);
4388
4389                 write_reg(info, CMD, CHRESET);
4390         }
4391 }
4392
4393 /* Reset all the ports to a known state.
4394  */
4395 void reset_adapter(SLMP_INFO *info)
4396 {
4397         int i;
4398
4399         for ( i=0; i < SCA_MAX_PORTS; ++i) {
4400                 if (info->port_array[i])
4401                         reset_port(info->port_array[i]);
4402         }
4403 }
4404
4405 /* Program port for asynchronous communications.
4406  */
4407 void async_mode(SLMP_INFO *info)
4408 {
4409
4410         unsigned char RegValue;
4411
4412         tx_stop(info);
4413         rx_stop(info);
4414
4415         /* MD0, Mode Register 0
4416          *
4417          * 07..05  PRCTL<2..0>, Protocol Mode, 000=async
4418          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4419          * 03      Reserved, must be 0
4420          * 02      CRCCC, CRC Calculation, 0=disabled
4421          * 01..00  STOP<1..0> Stop bits (00=1,10=2)
4422          *
4423          * 0000 0000
4424          */
4425         RegValue = 0x00;
4426         if (info->params.stop_bits != 1)
4427                 RegValue |= BIT1;
4428         write_reg(info, MD0, RegValue);
4429
4430         /* MD1, Mode Register 1
4431          *
4432          * 07..06  BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4433          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4434          * 03..02  RXCHR<1..0>, rx char size
4435          * 01..00  PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4436          *
4437          * 0100 0000
4438          */
4439         RegValue = 0x40;
4440         switch (info->params.data_bits) {
4441         case 7: RegValue |= BIT4 + BIT2; break;
4442         case 6: RegValue |= BIT5 + BIT3; break;
4443         case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4444         }
4445         if (info->params.parity != ASYNC_PARITY_NONE) {
4446                 RegValue |= BIT1;
4447                 if (info->params.parity == ASYNC_PARITY_ODD)
4448                         RegValue |= BIT0;
4449         }
4450         write_reg(info, MD1, RegValue);
4451
4452         /* MD2, Mode Register 2
4453          *
4454          * 07..02  Reserved, must be 0
4455          * 01..00  CNCT<1..0> Channel connection, 00=normal 11=local loopback
4456          *
4457          * 0000 0000
4458          */
4459         RegValue = 0x00;
4460         if (info->params.loopback)
4461                 RegValue |= (BIT1 + BIT0);
4462         write_reg(info, MD2, RegValue);
4463
4464         /* RXS, Receive clock source
4465          *
4466          * 07      Reserved, must be 0
4467          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4468          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4469          */
4470         RegValue=BIT6;
4471         write_reg(info, RXS, RegValue);
4472
4473         /* TXS, Transmit clock source
4474          *
4475          * 07      Reserved, must be 0
4476          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4477          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4478          */
4479         RegValue=BIT6;
4480         write_reg(info, TXS, RegValue);
4481
4482         /* Control Register
4483          *
4484          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4485          */
4486         info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4487         write_control_reg(info);
4488
4489         tx_set_idle(info);
4490
4491         /* RRC Receive Ready Control 0
4492          *
4493          * 07..05  Reserved, must be 0
4494          * 04..00  RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4495          */
4496         write_reg(info, RRC, 0x00);
4497
4498         /* TRC0 Transmit Ready Control 0
4499          *
4500          * 07..05  Reserved, must be 0
4501          * 04..00  TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4502          */
4503         write_reg(info, TRC0, 0x10);
4504
4505         /* TRC1 Transmit Ready Control 1
4506          *
4507          * 07..05  Reserved, must be 0
4508          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4509          */
4510         write_reg(info, TRC1, 0x1e);
4511
4512         /* CTL, MSCI control register
4513          *
4514          * 07..06  Reserved, set to 0
4515          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4516          * 04      IDLC, idle control, 0=mark 1=idle register
4517          * 03      BRK, break, 0=off 1 =on (async)
4518          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4519          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4520          * 00      RTS, RTS output control, 0=active 1=inactive
4521          *
4522          * 0001 0001
4523          */
4524         RegValue = 0x10;
4525         if (!(info->serial_signals & SerialSignal_RTS))
4526                 RegValue |= 0x01;
4527         write_reg(info, CTL, RegValue);
4528
4529         /* enable status interrupts */
4530         info->ie0_value |= TXINTE + RXINTE;
4531         write_reg(info, IE0, info->ie0_value);
4532
4533         /* enable break detect interrupt */
4534         info->ie1_value = BRKD;
4535         write_reg(info, IE1, info->ie1_value);
4536
4537         /* enable rx overrun interrupt */
4538         info->ie2_value = OVRN;
4539         write_reg(info, IE2, info->ie2_value);
4540
4541         set_rate( info, info->params.data_rate * 16 );
4542 }
4543
4544 /* Program the SCA for HDLC communications.
4545  */
4546 void hdlc_mode(SLMP_INFO *info)
4547 {
4548         unsigned char RegValue;
4549         u32 DpllDivisor;
4550
4551         // Can't use DPLL because SCA outputs recovered clock on RxC when
4552         // DPLL mode selected. This causes output contention with RxC receiver.
4553         // Use of DPLL would require external hardware to disable RxC receiver
4554         // when DPLL mode selected.
4555         info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4556
4557         /* disable DMA interrupts */
4558         write_reg(info, TXDMA + DIR, 0);
4559         write_reg(info, RXDMA + DIR, 0);
4560
4561         /* MD0, Mode Register 0
4562          *
4563          * 07..05  PRCTL<2..0>, Protocol Mode, 100=HDLC
4564          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4565          * 03      Reserved, must be 0
4566          * 02      CRCCC, CRC Calculation, 1=enabled
4567          * 01      CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4568          * 00      CRC0, CRC initial value, 1 = all 1s
4569          *
4570          * 1000 0001
4571          */
4572         RegValue = 0x81;
4573         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4574                 RegValue |= BIT4;
4575         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4576                 RegValue |= BIT4;
4577         if (info->params.crc_type == HDLC_CRC_16_CCITT)
4578                 RegValue |= BIT2 + BIT1;
4579         write_reg(info, MD0, RegValue);
4580
4581         /* MD1, Mode Register 1
4582          *
4583          * 07..06  ADDRS<1..0>, Address detect, 00=no addr check
4584          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits
4585          * 03..02  RXCHR<1..0>, rx char size, 00=8 bits
4586          * 01..00  PMPM<1..0>, Parity mode, 00=no parity
4587          *
4588          * 0000 0000
4589          */
4590         RegValue = 0x00;
4591         write_reg(info, MD1, RegValue);
4592
4593         /* MD2, Mode Register 2
4594          *
4595          * 07      NRZFM, 0=NRZ, 1=FM
4596          * 06..05  CODE<1..0> Encoding, 00=NRZ
4597          * 04..03  DRATE<1..0> DPLL Divisor, 00=8
4598          * 02      Reserved, must be 0
4599          * 01..00  CNCT<1..0> Channel connection, 0=normal
4600          *
4601          * 0000 0000
4602          */
4603         RegValue = 0x00;
4604         switch(info->params.encoding) {
4605         case HDLC_ENCODING_NRZI:          RegValue |= BIT5; break;
4606         case HDLC_ENCODING_BIPHASE_MARK:  RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4607         case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4608         case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break;      /* aka Manchester */
4609 #if 0
4610         case HDLC_ENCODING_NRZB:                                        /* not supported */
4611         case HDLC_ENCODING_NRZI_MARK:                                   /* not supported */
4612         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:                          /* not supported */
4613 #endif
4614         }
4615         if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4616                 DpllDivisor = 16;
4617                 RegValue |= BIT3;
4618         } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4619                 DpllDivisor = 8;
4620         } else {
4621                 DpllDivisor = 32;
4622                 RegValue |= BIT4;
4623         }
4624         write_reg(info, MD2, RegValue);
4625
4626
4627         /* RXS, Receive clock source
4628          *
4629          * 07      Reserved, must be 0
4630          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4631          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4632          */
4633         RegValue=0;
4634         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4635                 RegValue |= BIT6;
4636         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4637                 RegValue |= BIT6 + BIT5;
4638         write_reg(info, RXS, RegValue);
4639
4640         /* TXS, Transmit clock source
4641          *
4642          * 07      Reserved, must be 0
4643          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4644          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4645          */
4646         RegValue=0;
4647         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4648                 RegValue |= BIT6;
4649         if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4650                 RegValue |= BIT6 + BIT5;
4651         write_reg(info, TXS, RegValue);
4652
4653         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4654                 set_rate(info, info->params.clock_speed * DpllDivisor);
4655         else
4656                 set_rate(info, info->params.clock_speed);
4657
4658         /* GPDATA (General Purpose I/O Data Register)
4659          *
4660          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4661          */
4662         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4663                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4664         else
4665                 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4666         write_control_reg(info);
4667
4668         /* RRC Receive Ready Control 0
4669          *
4670          * 07..05  Reserved, must be 0
4671          * 04..00  RRC<4..0> Rx FIFO trigger active
4672          */
4673         write_reg(info, RRC, rx_active_fifo_level);
4674
4675         /* TRC0 Transmit Ready Control 0
4676          *
4677          * 07..05  Reserved, must be 0
4678          * 04..00  TRC<4..0> Tx FIFO trigger active
4679          */
4680         write_reg(info, TRC0, tx_active_fifo_level);
4681
4682         /* TRC1 Transmit Ready Control 1
4683          *
4684          * 07..05  Reserved, must be 0
4685          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4686          */
4687         write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4688
4689         /* DMR, DMA Mode Register
4690          *
4691          * 07..05  Reserved, must be 0
4692          * 04      TMOD, Transfer Mode: 1=chained-block
4693          * 03      Reserved, must be 0
4694          * 02      NF, Number of Frames: 1=multi-frame
4695          * 01      CNTE, Frame End IRQ Counter enable: 0=disabled
4696          * 00      Reserved, must be 0
4697          *
4698          * 0001 0100
4699          */
4700         write_reg(info, TXDMA + DMR, 0x14);
4701         write_reg(info, RXDMA + DMR, 0x14);
4702
4703         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4704         write_reg(info, RXDMA + CPB,
4705                 (unsigned char)(info->buffer_list_phys >> 16));
4706
4707         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4708         write_reg(info, TXDMA + CPB,
4709                 (unsigned char)(info->buffer_list_phys >> 16));
4710
4711         /* enable status interrupts. other code enables/disables
4712          * the individual sources for these two interrupt classes.
4713          */
4714         info->ie0_value |= TXINTE + RXINTE;
4715         write_reg(info, IE0, info->ie0_value);
4716
4717         /* CTL, MSCI control register
4718          *
4719          * 07..06  Reserved, set to 0
4720          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4721          * 04      IDLC, idle control, 0=mark 1=idle register
4722          * 03      BRK, break, 0=off 1 =on (async)
4723          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4724          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4725          * 00      RTS, RTS output control, 0=active 1=inactive
4726          *
4727          * 0001 0001
4728          */
4729         RegValue = 0x10;
4730         if (!(info->serial_signals & SerialSignal_RTS))
4731                 RegValue |= 0x01;
4732         write_reg(info, CTL, RegValue);
4733
4734         /* preamble not supported ! */
4735
4736         tx_set_idle(info);
4737         tx_stop(info);
4738         rx_stop(info);
4739
4740         set_rate(info, info->params.clock_speed);
4741
4742         if (info->params.loopback)
4743                 enable_loopback(info,1);
4744 }
4745
4746 /* Set the transmit HDLC idle mode
4747  */
4748 void tx_set_idle(SLMP_INFO *info)
4749 {
4750         unsigned char RegValue = 0xff;
4751
4752         /* Map API idle mode to SCA register bits */
4753         switch(info->idle_mode) {
4754         case HDLC_TXIDLE_FLAGS:                 RegValue = 0x7e; break;
4755         case HDLC_TXIDLE_ALT_ZEROS_ONES:        RegValue = 0xaa; break;
4756         case HDLC_TXIDLE_ZEROS:                 RegValue = 0x00; break;
4757         case HDLC_TXIDLE_ONES:                  RegValue = 0xff; break;
4758         case HDLC_TXIDLE_ALT_MARK_SPACE:        RegValue = 0xaa; break;
4759         case HDLC_TXIDLE_SPACE:                 RegValue = 0x00; break;
4760         case HDLC_TXIDLE_MARK:                  RegValue = 0xff; break;
4761         }
4762
4763         write_reg(info, IDL, RegValue);
4764 }
4765
4766 /* Query the adapter for the state of the V24 status (input) signals.
4767  */
4768 void get_signals(SLMP_INFO *info)
4769 {
4770         u16 status = read_reg(info, SR3);
4771         u16 gpstatus = read_status_reg(info);
4772         u16 testbit;
4773
4774         /* clear all serial signals except DTR and RTS */
4775         info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
4776
4777         /* set serial signal bits to reflect MISR */
4778
4779         if (!(status & BIT3))
4780                 info->serial_signals |= SerialSignal_CTS;
4781
4782         if ( !(status & BIT2))
4783                 info->serial_signals |= SerialSignal_DCD;
4784
4785         testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4786         if (!(gpstatus & testbit))
4787                 info->serial_signals |= SerialSignal_RI;
4788
4789         testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4790         if (!(gpstatus & testbit))
4791                 info->serial_signals |= SerialSignal_DSR;
4792 }
4793
4794 /* Set the state of DTR and RTS based on contents of
4795  * serial_signals member of device context.
4796  */
4797 void set_signals(SLMP_INFO *info)
4798 {
4799         unsigned char RegValue;
4800         u16 EnableBit;
4801
4802         RegValue = read_reg(info, CTL);
4803         if (info->serial_signals & SerialSignal_RTS)
4804                 RegValue &= ~BIT0;
4805         else
4806                 RegValue |= BIT0;
4807         write_reg(info, CTL, RegValue);
4808
4809         // Port 0..3 DTR is ctrl reg <1,3,5,7>
4810         EnableBit = BIT1 << (info->port_num*2);
4811         if (info->serial_signals & SerialSignal_DTR)
4812                 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4813         else
4814                 info->port_array[0]->ctrlreg_value |= EnableBit;
4815         write_control_reg(info);
4816 }
4817
4818 /*******************/
4819 /* DMA Buffer Code */
4820 /*******************/
4821
4822 /* Set the count for all receive buffers to SCABUFSIZE
4823  * and set the current buffer to the first buffer. This effectively
4824  * makes all buffers free and discards any data in buffers.
4825  */
4826 void rx_reset_buffers(SLMP_INFO *info)
4827 {
4828         rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4829 }
4830
4831 /* Free the buffers used by a received frame
4832  *
4833  * info   pointer to device instance data
4834  * first  index of 1st receive buffer of frame
4835  * last   index of last receive buffer of frame
4836  */
4837 void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4838 {
4839         int done = 0;
4840
4841         while(!done) {
4842                 /* reset current buffer for reuse */
4843                 info->rx_buf_list[first].status = 0xff;
4844
4845                 if (first == last) {
4846                         done = 1;
4847                         /* set new last rx descriptor address */
4848                         write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4849                 }
4850
4851                 first++;
4852                 if (first == info->rx_buf_count)
4853                         first = 0;
4854         }
4855
4856         /* set current buffer to next buffer after last buffer of frame */
4857         info->current_rx_buf = first;
4858 }
4859
4860 /* Return a received frame from the receive DMA buffers.
4861  * Only frames received without errors are returned.
4862  *
4863  * Return Value:        1 if frame returned, otherwise 0
4864  */
4865 int rx_get_frame(SLMP_INFO *info)
4866 {
4867         unsigned int StartIndex, EndIndex;      /* index of 1st and last buffers of Rx frame */
4868         unsigned short status;
4869         unsigned int framesize = 0;
4870         int ReturnCode = 0;
4871         unsigned long flags;
4872         struct tty_struct *tty = info->tty;
4873         unsigned char addr_field = 0xff;
4874         SCADESC *desc;
4875         SCADESC_EX *desc_ex;
4876
4877 CheckAgain:
4878         /* assume no frame returned, set zero length */
4879         framesize = 0;
4880         addr_field = 0xff;
4881
4882         /*
4883          * current_rx_buf points to the 1st buffer of the next available
4884          * receive frame. To find the last buffer of the frame look for
4885          * a non-zero status field in the buffer entries. (The status
4886          * field is set by the 16C32 after completing a receive frame.
4887          */
4888         StartIndex = EndIndex = info->current_rx_buf;
4889
4890         for ( ;; ) {
4891                 desc = &info->rx_buf_list[EndIndex];
4892                 desc_ex = &info->rx_buf_list_ex[EndIndex];
4893
4894                 if (desc->status == 0xff)
4895                         goto Cleanup;   /* current desc still in use, no frames available */
4896
4897                 if (framesize == 0 && info->params.addr_filter != 0xff)
4898                         addr_field = desc_ex->virt_addr[0];
4899
4900                 framesize += desc->length;
4901
4902                 /* Status != 0 means last buffer of frame */
4903                 if (desc->status)
4904                         break;
4905
4906                 EndIndex++;
4907                 if (EndIndex == info->rx_buf_count)
4908                         EndIndex = 0;
4909
4910                 if (EndIndex == info->current_rx_buf) {
4911                         /* all buffers have been 'used' but none mark      */
4912                         /* the end of a frame. Reset buffers and receiver. */
4913                         if ( info->rx_enabled ){
4914                                 spin_lock_irqsave(&info->lock,flags);
4915                                 rx_start(info);
4916                                 spin_unlock_irqrestore(&info->lock,flags);
4917                         }
4918                         goto Cleanup;
4919                 }
4920
4921         }
4922
4923         /* check status of receive frame */
4924
4925         /* frame status is byte stored after frame data
4926          *
4927          * 7 EOM (end of msg), 1 = last buffer of frame
4928          * 6 Short Frame, 1 = short frame
4929          * 5 Abort, 1 = frame aborted
4930          * 4 Residue, 1 = last byte is partial
4931          * 3 Overrun, 1 = overrun occurred during frame reception
4932          * 2 CRC,     1 = CRC error detected
4933          *
4934          */
4935         status = desc->status;
4936
4937         /* ignore CRC bit if not using CRC (bit is undefined) */
4938         /* Note:CRC is not save to data buffer */
4939         if (info->params.crc_type == HDLC_CRC_NONE)
4940                 status &= ~BIT2;
4941
4942         if (framesize == 0 ||
4943                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4944                 /* discard 0 byte frames, this seems to occur sometime
4945                  * when remote is idling flags.
4946                  */
4947                 rx_free_frame_buffers(info, StartIndex, EndIndex);
4948                 goto CheckAgain;
4949         }
4950
4951         if (framesize < 2)
4952                 status |= BIT6;
4953
4954         if (status & (BIT6+BIT5+BIT3+BIT2)) {
4955                 /* received frame has errors,
4956                  * update counts and mark frame size as 0
4957                  */
4958                 if (status & BIT6)
4959                         info->icount.rxshort++;
4960                 else if (status & BIT5)
4961                         info->icount.rxabort++;
4962                 else if (status & BIT3)
4963                         info->icount.rxover++;
4964                 else
4965                         info->icount.rxcrc++;
4966
4967                 framesize = 0;
4968 #if SYNCLINK_GENERIC_HDLC
4969                 {
4970                         struct net_device_stats *stats = hdlc_stats(info->netdev);
4971                         stats->rx_errors++;
4972                         stats->rx_frame_errors++;
4973                 }
4974 #endif
4975         }
4976
4977         if ( debug_level >= DEBUG_LEVEL_BH )
4978                 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4979                         __FILE__,__LINE__,info->device_name,status,framesize);
4980
4981         if ( debug_level >= DEBUG_LEVEL_DATA )
4982                 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
4983                         min_t(int, framesize,SCABUFSIZE),0);
4984
4985         if (framesize) {
4986                 if (framesize > info->max_frame_size)
4987                         info->icount.rxlong++;
4988                 else {
4989                         /* copy dma buffer(s) to contiguous intermediate buffer */
4990                         int copy_count = framesize;
4991                         int index = StartIndex;
4992                         unsigned char *ptmp = info->tmp_rx_buf;
4993                         info->tmp_rx_buf_count = framesize;
4994
4995                         info->icount.rxok++;
4996
4997                         while(copy_count) {
4998                                 int partial_count = min(copy_count,SCABUFSIZE);
4999                                 memcpy( ptmp,
5000                                         info->rx_buf_list_ex[index].virt_addr,
5001                                         partial_count );
5002                                 ptmp += partial_count;
5003                                 copy_count -= partial_count;
5004
5005                                 if ( ++index == info->rx_buf_count )
5006                                         index = 0;
5007                         }
5008
5009 #if SYNCLINK_GENERIC_HDLC
5010                         if (info->netcount)
5011                                 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
5012                         else
5013 #endif
5014                                 ldisc_receive_buf(tty,info->tmp_rx_buf,
5015                                                   info->flag_buf, framesize);
5016                 }
5017         }
5018         /* Free the buffers used by this frame. */
5019         rx_free_frame_buffers( info, StartIndex, EndIndex );
5020
5021         ReturnCode = 1;
5022
5023 Cleanup:
5024         if ( info->rx_enabled && info->rx_overflow ) {
5025                 /* Receiver is enabled, but needs to restarted due to
5026                  * rx buffer overflow. If buffers are empty, restart receiver.
5027                  */
5028                 if (info->rx_buf_list[EndIndex].status == 0xff) {
5029                         spin_lock_irqsave(&info->lock,flags);
5030                         rx_start(info);
5031                         spin_unlock_irqrestore(&info->lock,flags);
5032                 }
5033         }
5034
5035         return ReturnCode;
5036 }
5037
5038 /* load the transmit DMA buffer with data
5039  */
5040 void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5041 {
5042         unsigned short copy_count;
5043         unsigned int i = 0;
5044         SCADESC *desc;
5045         SCADESC_EX *desc_ex;
5046
5047         if ( debug_level >= DEBUG_LEVEL_DATA )
5048                 trace_block(info,buf, min_t(int, count,SCABUFSIZE), 1);
5049
5050         /* Copy source buffer to one or more DMA buffers, starting with
5051          * the first transmit dma buffer.
5052          */
5053         for(i=0;;)
5054         {
5055                 copy_count = min_t(unsigned short,count,SCABUFSIZE);
5056
5057                 desc = &info->tx_buf_list[i];
5058                 desc_ex = &info->tx_buf_list_ex[i];
5059
5060                 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5061
5062                 desc->length = copy_count;
5063                 desc->status = 0;
5064
5065                 buf += copy_count;
5066                 count -= copy_count;
5067
5068                 if (!count)
5069                         break;
5070
5071                 i++;
5072                 if (i >= info->tx_buf_count)
5073                         i = 0;
5074         }
5075
5076         info->tx_buf_list[i].status = 0x81;     /* set EOM and EOT status */
5077         info->last_tx_buf = ++i;
5078 }
5079
5080 int register_test(SLMP_INFO *info)
5081 {
5082         static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5083         static unsigned int count = ARRAY_SIZE(testval);
5084         unsigned int i;
5085         int rc = TRUE;
5086         unsigned long flags;
5087
5088         spin_lock_irqsave(&info->lock,flags);
5089         reset_port(info);
5090
5091         /* assume failure */
5092         info->init_error = DiagStatus_AddressFailure;
5093
5094         /* Write bit patterns to various registers but do it out of */
5095         /* sync, then read back and verify values. */
5096
5097         for (i = 0 ; i < count ; i++) {
5098                 write_reg(info, TMC, testval[i]);
5099                 write_reg(info, IDL, testval[(i+1)%count]);
5100                 write_reg(info, SA0, testval[(i+2)%count]);
5101                 write_reg(info, SA1, testval[(i+3)%count]);
5102
5103                 if ( (read_reg(info, TMC) != testval[i]) ||
5104                           (read_reg(info, IDL) != testval[(i+1)%count]) ||
5105                           (read_reg(info, SA0) != testval[(i+2)%count]) ||
5106                           (read_reg(info, SA1) != testval[(i+3)%count]) )
5107                 {
5108                         rc = FALSE;
5109                         break;
5110                 }
5111         }
5112
5113         reset_port(info);
5114         spin_unlock_irqrestore(&info->lock,flags);
5115
5116         return rc;
5117 }
5118
5119 int irq_test(SLMP_INFO *info)
5120 {
5121         unsigned long timeout;
5122         unsigned long flags;
5123
5124         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5125
5126         spin_lock_irqsave(&info->lock,flags);
5127         reset_port(info);
5128
5129         /* assume failure */
5130         info->init_error = DiagStatus_IrqFailure;
5131         info->irq_occurred = FALSE;
5132
5133         /* setup timer0 on SCA0 to interrupt */
5134
5135         /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5136         write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5137
5138         write_reg(info, (unsigned char)(timer + TEPR), 0);      /* timer expand prescale */
5139         write_reg16(info, (unsigned char)(timer + TCONR), 1);   /* timer constant */
5140
5141
5142         /* TMCS, Timer Control/Status Register
5143          *
5144          * 07      CMF, Compare match flag (read only) 1=match
5145          * 06      ECMI, CMF Interrupt Enable: 1=enabled
5146          * 05      Reserved, must be 0
5147          * 04      TME, Timer Enable
5148          * 03..00  Reserved, must be 0
5149          *
5150          * 0101 0000
5151          */
5152         write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5153
5154         spin_unlock_irqrestore(&info->lock,flags);
5155
5156         timeout=100;
5157         while( timeout-- && !info->irq_occurred ) {
5158                 msleep_interruptible(10);
5159         }
5160
5161         spin_lock_irqsave(&info->lock,flags);
5162         reset_port(info);
5163         spin_unlock_irqrestore(&info->lock,flags);
5164
5165         return info->irq_occurred;
5166 }
5167
5168 /* initialize individual SCA device (2 ports)
5169  */
5170 static int sca_init(SLMP_INFO *info)
5171 {
5172         /* set wait controller to single mem partition (low), no wait states */
5173         write_reg(info, PABR0, 0);      /* wait controller addr boundary 0 */
5174         write_reg(info, PABR1, 0);      /* wait controller addr boundary 1 */
5175         write_reg(info, WCRL, 0);       /* wait controller low range */
5176         write_reg(info, WCRM, 0);       /* wait controller mid range */
5177         write_reg(info, WCRH, 0);       /* wait controller high range */
5178
5179         /* DPCR, DMA Priority Control
5180          *
5181          * 07..05  Not used, must be 0
5182          * 04      BRC, bus release condition: 0=all transfers complete
5183          * 03      CCC, channel change condition: 0=every cycle
5184          * 02..00  PR<2..0>, priority 100=round robin
5185          *
5186          * 00000100 = 0x04
5187          */
5188         write_reg(info, DPCR, dma_priority);
5189
5190         /* DMA Master Enable, BIT7: 1=enable all channels */
5191         write_reg(info, DMER, 0x80);
5192
5193         /* enable all interrupt classes */
5194         write_reg(info, IER0, 0xff);    /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5195         write_reg(info, IER1, 0xff);    /* DMIB,DMIA (channels 0-3) */
5196         write_reg(info, IER2, 0xf0);    /* TIRQ (timers 0-3) */
5197
5198         /* ITCR, interrupt control register
5199          * 07      IPC, interrupt priority, 0=MSCI->DMA
5200          * 06..05  IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5201          * 04      VOS, Vector Output, 0=unmodified vector
5202          * 03..00  Reserved, must be 0
5203          */
5204         write_reg(info, ITCR, 0);
5205
5206         return TRUE;
5207 }
5208
5209 /* initialize adapter hardware
5210  */
5211 int init_adapter(SLMP_INFO *info)
5212 {
5213         int i;
5214
5215         /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5216         volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5217         u32 readval;
5218
5219         info->misc_ctrl_value |= BIT30;
5220         *MiscCtrl = info->misc_ctrl_value;
5221
5222         /*
5223          * Force at least 170ns delay before clearing
5224          * reset bit. Each read from LCR takes at least
5225          * 30ns so 10 times for 300ns to be safe.
5226          */
5227         for(i=0;i<10;i++)
5228                 readval = *MiscCtrl;
5229
5230         info->misc_ctrl_value &= ~BIT30;
5231         *MiscCtrl = info->misc_ctrl_value;
5232
5233         /* init control reg (all DTRs off, all clksel=input) */
5234         info->ctrlreg_value = 0xaa;
5235         write_control_reg(info);
5236
5237         {
5238                 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5239                 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5240
5241                 switch(read_ahead_count)
5242                 {
5243                 case 16:
5244                         lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5245                         break;
5246                 case 8:
5247                         lcr1_brdr_value |= BIT5 + BIT4;
5248                         break;
5249                 case 4:
5250                         lcr1_brdr_value |= BIT5 + BIT3;
5251                         break;
5252                 case 0:
5253                         lcr1_brdr_value |= BIT5;
5254                         break;
5255                 }
5256
5257                 *LCR1BRDR = lcr1_brdr_value;
5258                 *MiscCtrl = misc_ctrl_value;
5259         }
5260
5261         sca_init(info->port_array[0]);
5262         sca_init(info->port_array[2]);
5263
5264         return TRUE;
5265 }
5266
5267 /* Loopback an HDLC frame to test the hardware
5268  * interrupt and DMA functions.
5269  */
5270 int loopback_test(SLMP_INFO *info)
5271 {
5272 #define TESTFRAMESIZE 20
5273
5274         unsigned long timeout;
5275         u16 count = TESTFRAMESIZE;
5276         unsigned char buf[TESTFRAMESIZE];
5277         int rc = FALSE;
5278         unsigned long flags;
5279
5280         struct tty_struct *oldtty = info->tty;
5281         u32 speed = info->params.clock_speed;
5282
5283         info->params.clock_speed = 3686400;
5284         info->tty = NULL;
5285
5286         /* assume failure */
5287         info->init_error = DiagStatus_DmaFailure;
5288
5289         /* build and send transmit frame */
5290         for (count = 0; count < TESTFRAMESIZE;++count)
5291                 buf[count] = (unsigned char)count;
5292
5293         memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5294
5295         /* program hardware for HDLC and enabled receiver */
5296         spin_lock_irqsave(&info->lock,flags);
5297         hdlc_mode(info);
5298         enable_loopback(info,1);
5299         rx_start(info);
5300         info->tx_count = count;
5301         tx_load_dma_buffer(info,buf,count);
5302         tx_start(info);
5303         spin_unlock_irqrestore(&info->lock,flags);
5304
5305         /* wait for receive complete */
5306         /* Set a timeout for waiting for interrupt. */
5307         for ( timeout = 100; timeout; --timeout ) {
5308                 msleep_interruptible(10);
5309
5310                 if (rx_get_frame(info)) {
5311                         rc = TRUE;
5312                         break;
5313                 }
5314         }
5315
5316         /* verify received frame length and contents */
5317         if (rc == TRUE &&
5318                 ( info->tmp_rx_buf_count != count ||
5319                   memcmp(buf, info->tmp_rx_buf,count))) {
5320                 rc = FALSE;
5321         }
5322
5323         spin_lock_irqsave(&info->lock,flags);
5324         reset_adapter(info);
5325         spin_unlock_irqrestore(&info->lock,flags);
5326
5327         info->params.clock_speed = speed;
5328         info->tty = oldtty;
5329
5330         return rc;
5331 }
5332
5333 /* Perform diagnostics on hardware
5334  */
5335 int adapter_test( SLMP_INFO *info )
5336 {
5337         unsigned long flags;
5338         if ( debug_level >= DEBUG_LEVEL_INFO )
5339                 printk( "%s(%d):Testing device %s\n",
5340                         __FILE__,__LINE__,info->device_name );
5341
5342         spin_lock_irqsave(&info->lock,flags);
5343         init_adapter(info);
5344         spin_unlock_irqrestore(&info->lock,flags);
5345
5346         info->port_array[0]->port_count = 0;
5347
5348         if ( register_test(info->port_array[0]) &&
5349                 register_test(info->port_array[1])) {
5350
5351                 info->port_array[0]->port_count = 2;
5352
5353                 if ( register_test(info->port_array[2]) &&
5354                         register_test(info->port_array[3]) )
5355                         info->port_array[0]->port_count += 2;
5356         }
5357         else {
5358                 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5359                         __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5360                 return -ENODEV;
5361         }
5362
5363         if ( !irq_test(info->port_array[0]) ||
5364                 !irq_test(info->port_array[1]) ||
5365                  (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5366                  (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5367                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5368                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5369                 return -ENODEV;
5370         }
5371
5372         if (!loopback_test(info->port_array[0]) ||
5373                 !loopback_test(info->port_array[1]) ||
5374                  (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5375                  (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5376                 printk( "%s(%d):DMA test failure for device %s\n",
5377                         __FILE__,__LINE__,info->device_name);
5378                 return -ENODEV;
5379         }
5380
5381         if ( debug_level >= DEBUG_LEVEL_INFO )
5382                 printk( "%s(%d):device %s passed diagnostics\n",
5383                         __FILE__,__LINE__,info->device_name );
5384
5385         info->port_array[0]->init_error = 0;
5386         info->port_array[1]->init_error = 0;
5387         if ( info->port_count > 2 ) {
5388                 info->port_array[2]->init_error = 0;
5389                 info->port_array[3]->init_error = 0;
5390         }
5391
5392         return 0;
5393 }
5394
5395 /* Test the shared memory on a PCI adapter.
5396  */
5397 int memory_test(SLMP_INFO *info)
5398 {
5399         static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5400                 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5401         unsigned long count = ARRAY_SIZE(testval);
5402         unsigned long i;
5403         unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5404         unsigned long * addr = (unsigned long *)info->memory_base;
5405
5406         /* Test data lines with test pattern at one location. */
5407
5408         for ( i = 0 ; i < count ; i++ ) {
5409                 *addr = testval[i];
5410                 if ( *addr != testval[i] )
5411                         return FALSE;
5412         }
5413
5414         /* Test address lines with incrementing pattern over */
5415         /* entire address range. */
5416
5417         for ( i = 0 ; i < limit ; i++ ) {
5418                 *addr = i * 4;
5419                 addr++;
5420         }
5421
5422         addr = (unsigned long *)info->memory_base;
5423
5424         for ( i = 0 ; i < limit ; i++ ) {
5425                 if ( *addr != i * 4 )
5426                         return FALSE;
5427                 addr++;
5428         }
5429
5430         memset( info->memory_base, 0, SCA_MEM_SIZE );
5431         return TRUE;
5432 }
5433
5434 /* Load data into PCI adapter shared memory.
5435  *
5436  * The PCI9050 releases control of the local bus
5437  * after completing the current read or write operation.
5438  *
5439  * While the PCI9050 write FIFO not empty, the
5440  * PCI9050 treats all of the writes as a single transaction
5441  * and does not release the bus. This causes DMA latency problems
5442  * at high speeds when copying large data blocks to the shared memory.
5443  *
5444  * This function breaks a write into multiple transations by
5445  * interleaving a read which flushes the write FIFO and 'completes'
5446  * the write transation. This allows any pending DMA request to gain control
5447  * of the local bus in a timely fasion.
5448  */
5449 void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5450 {
5451         /* A load interval of 16 allows for 4 32-bit writes at */
5452         /* 136ns each for a maximum latency of 542ns on the local bus.*/
5453
5454         unsigned short interval = count / sca_pci_load_interval;
5455         unsigned short i;
5456
5457         for ( i = 0 ; i < interval ; i++ )
5458         {
5459                 memcpy(dest, src, sca_pci_load_interval);
5460                 read_status_reg(info);
5461                 dest += sca_pci_load_interval;
5462                 src += sca_pci_load_interval;
5463         }
5464
5465         memcpy(dest, src, count % sca_pci_load_interval);
5466 }
5467
5468 void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5469 {
5470         int i;
5471         int linecount;
5472         if (xmit)
5473                 printk("%s tx data:\n",info->device_name);
5474         else
5475                 printk("%s rx data:\n",info->device_name);
5476
5477         while(count) {
5478                 if (count > 16)
5479                         linecount = 16;
5480                 else
5481                         linecount = count;
5482
5483                 for(i=0;i<linecount;i++)
5484                         printk("%02X ",(unsigned char)data[i]);
5485                 for(;i<17;i++)
5486                         printk("   ");
5487                 for(i=0;i<linecount;i++) {
5488                         if (data[i]>=040 && data[i]<=0176)
5489                                 printk("%c",data[i]);
5490                         else
5491                                 printk(".");
5492                 }
5493                 printk("\n");
5494
5495                 data  += linecount;
5496                 count -= linecount;
5497         }
5498 }       /* end of trace_block() */
5499
5500 /* called when HDLC frame times out
5501  * update stats and do tx completion processing
5502  */
5503 void tx_timeout(unsigned long context)
5504 {
5505         SLMP_INFO *info = (SLMP_INFO*)context;
5506         unsigned long flags;
5507
5508         if ( debug_level >= DEBUG_LEVEL_INFO )
5509                 printk( "%s(%d):%s tx_timeout()\n",
5510                         __FILE__,__LINE__,info->device_name);
5511         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5512                 info->icount.txtimeout++;
5513         }
5514         spin_lock_irqsave(&info->lock,flags);
5515         info->tx_active = 0;
5516         info->tx_count = info->tx_put = info->tx_get = 0;
5517
5518         spin_unlock_irqrestore(&info->lock,flags);
5519
5520 #if SYNCLINK_GENERIC_HDLC
5521         if (info->netcount)
5522                 hdlcdev_tx_done(info);
5523         else
5524 #endif
5525                 bh_transmit(info);
5526 }
5527
5528 /* called to periodically check the DSR/RI modem signal input status
5529  */
5530 void status_timeout(unsigned long context)
5531 {
5532         u16 status = 0;
5533         SLMP_INFO *info = (SLMP_INFO*)context;
5534         unsigned long flags;
5535         unsigned char delta;
5536
5537
5538         spin_lock_irqsave(&info->lock,flags);
5539         get_signals(info);
5540         spin_unlock_irqrestore(&info->lock,flags);
5541
5542         /* check for DSR/RI state change */
5543
5544         delta = info->old_signals ^ info->serial_signals;
5545         info->old_signals = info->serial_signals;
5546
5547         if (delta & SerialSignal_DSR)
5548                 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5549
5550         if (delta & SerialSignal_RI)
5551                 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5552
5553         if (delta & SerialSignal_DCD)
5554                 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5555
5556         if (delta & SerialSignal_CTS)
5557                 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5558
5559         if (status)
5560                 isr_io_pin(info,status);
5561
5562         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
5563 }
5564
5565
5566 /* Register Access Routines -
5567  * All registers are memory mapped
5568  */
5569 #define CALC_REGADDR() \
5570         unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5571         if (info->port_num > 1) \
5572                 RegAddr += 256;                 /* port 0-1 SCA0, 2-3 SCA1 */ \
5573         if ( info->port_num & 1) { \
5574                 if (Addr > 0x7f) \
5575                         RegAddr += 0x40;        /* DMA access */ \
5576                 else if (Addr > 0x1f && Addr < 0x60) \
5577                         RegAddr += 0x20;        /* MSCI access */ \
5578         }
5579
5580
5581 unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5582 {
5583         CALC_REGADDR();
5584         return *RegAddr;
5585 }
5586 void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5587 {
5588         CALC_REGADDR();
5589         *RegAddr = Value;
5590 }
5591
5592 u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5593 {
5594         CALC_REGADDR();
5595         return *((u16 *)RegAddr);
5596 }
5597
5598 void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5599 {
5600         CALC_REGADDR();
5601         *((u16 *)RegAddr) = Value;
5602 }
5603
5604 unsigned char read_status_reg(SLMP_INFO * info)
5605 {
5606         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5607         return *RegAddr;
5608 }
5609
5610 void write_control_reg(SLMP_INFO * info)
5611 {
5612         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5613         *RegAddr = info->port_array[0]->ctrlreg_value;
5614 }
5615
5616
5617 static int __devinit synclinkmp_init_one (struct pci_dev *dev,
5618                                           const struct pci_device_id *ent)
5619 {
5620         if (pci_enable_device(dev)) {
5621                 printk("error enabling pci device %p\n", dev);
5622                 return -EIO;
5623         }
5624         device_init( ++synclinkmp_adapter_count, dev );
5625         return 0;
5626 }
5627
5628 static void __devexit synclinkmp_remove_one (struct pci_dev *dev)
5629 {
5630 }