TTY: call tty_port_destroy in the rest of drivers
[linux-3.10.git] / drivers / tty / 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/seq_file.h>
54 #include <linux/slab.h>
55 #include <linux/netdevice.h>
56 #include <linux/vmalloc.h>
57 #include <linux/init.h>
58 #include <linux/delay.h>
59 #include <linux/ioctl.h>
60
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         struct tty_port         port;
155         int                     line;
156         unsigned short          close_delay;
157         unsigned short          closing_wait;   /* time to wait before closing */
158
159         struct mgsl_icount      icount;
160
161         int                     timeout;
162         int                     x_char;         /* xon/xoff character */
163         u16                     read_status_mask1;  /* break detection (SR1 indications) */
164         u16                     read_status_mask2;  /* parity/framing/overun (SR2 indications) */
165         unsigned char           ignore_status_mask1;  /* break detection (SR1 indications) */
166         unsigned char           ignore_status_mask2;  /* parity/framing/overun (SR2 indications) */
167         unsigned char           *tx_buf;
168         int                     tx_put;
169         int                     tx_get;
170         int                     tx_count;
171
172         wait_queue_head_t       status_event_wait_q;
173         wait_queue_head_t       event_wait_q;
174         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
175         struct _synclinkmp_info *next_device;   /* device list link */
176         struct timer_list       status_timer;   /* input signal status check timer */
177
178         spinlock_t lock;                /* spinlock for synchronizing with ISR */
179         struct work_struct task;                        /* task structure for scheduling bh */
180
181         u32 max_frame_size;                     /* as set by device config */
182
183         u32 pending_bh;
184
185         bool bh_running;                                /* Protection from multiple */
186         int isr_overflow;
187         bool bh_requested;
188
189         int dcd_chkcount;                       /* check counts to prevent */
190         int cts_chkcount;                       /* too many IRQs if a signal */
191         int dsr_chkcount;                       /* is floating */
192         int ri_chkcount;
193
194         char *buffer_list;                      /* virtual address of Rx & Tx buffer lists */
195         unsigned long buffer_list_phys;
196
197         unsigned int rx_buf_count;              /* count of total allocated Rx buffers */
198         SCADESC *rx_buf_list;                   /* list of receive buffer entries */
199         SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
200         unsigned int current_rx_buf;
201
202         unsigned int tx_buf_count;              /* count of total allocated Tx buffers */
203         SCADESC *tx_buf_list;           /* list of transmit buffer entries */
204         SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
205         unsigned int last_tx_buf;
206
207         unsigned char *tmp_rx_buf;
208         unsigned int tmp_rx_buf_count;
209
210         bool rx_enabled;
211         bool rx_overflow;
212
213         bool tx_enabled;
214         bool tx_active;
215         u32 idle_mode;
216
217         unsigned char ie0_value;
218         unsigned char ie1_value;
219         unsigned char ie2_value;
220         unsigned char ctrlreg_value;
221         unsigned char old_signals;
222
223         char device_name[25];                   /* device instance name */
224
225         int port_count;
226         int adapter_num;
227         int port_num;
228
229         struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
230
231         unsigned int bus_type;                  /* expansion bus type (ISA,EISA,PCI) */
232
233         unsigned int irq_level;                 /* interrupt level */
234         unsigned long irq_flags;
235         bool irq_requested;                     /* true if IRQ requested */
236
237         MGSL_PARAMS params;                     /* communications parameters */
238
239         unsigned char serial_signals;           /* current serial signal states */
240
241         bool irq_occurred;                      /* for diagnostics use */
242         unsigned int init_error;                /* Initialization startup error */
243
244         u32 last_mem_alloc;
245         unsigned char* memory_base;             /* shared memory address (PCI only) */
246         u32 phys_memory_base;
247         int shared_mem_requested;
248
249         unsigned char* sca_base;                /* HD64570 SCA Memory address */
250         u32 phys_sca_base;
251         u32 sca_offset;
252         bool sca_base_requested;
253
254         unsigned char* lcr_base;                /* local config registers (PCI only) */
255         u32 phys_lcr_base;
256         u32 lcr_offset;
257         int lcr_mem_requested;
258
259         unsigned char* statctrl_base;           /* status/control register memory */
260         u32 phys_statctrl_base;
261         u32 statctrl_offset;
262         bool sca_statctrl_requested;
263
264         u32 misc_ctrl_value;
265         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
266         char char_buf[MAX_ASYNC_BUFFER_SIZE];
267         bool drop_rts_on_tx_done;
268
269         struct  _input_signal_events    input_signal_events;
270
271         /* SPPP/Cisco HDLC device parts */
272         int netcount;
273         spinlock_t netlock;
274
275 #if SYNCLINK_GENERIC_HDLC
276         struct net_device *netdev;
277 #endif
278
279 } SLMP_INFO;
280
281 #define MGSL_MAGIC 0x5401
282
283 /*
284  * define serial signal status change macros
285  */
286 #define MISCSTATUS_DCD_LATCHED  (SerialSignal_DCD<<8)   /* indicates change in DCD */
287 #define MISCSTATUS_RI_LATCHED   (SerialSignal_RI<<8)    /* indicates change in RI */
288 #define MISCSTATUS_CTS_LATCHED  (SerialSignal_CTS<<8)   /* indicates change in CTS */
289 #define MISCSTATUS_DSR_LATCHED  (SerialSignal_DSR<<8)   /* change in DSR */
290
291 /* Common Register macros */
292 #define LPR     0x00
293 #define PABR0   0x02
294 #define PABR1   0x03
295 #define WCRL    0x04
296 #define WCRM    0x05
297 #define WCRH    0x06
298 #define DPCR    0x08
299 #define DMER    0x09
300 #define ISR0    0x10
301 #define ISR1    0x11
302 #define ISR2    0x12
303 #define IER0    0x14
304 #define IER1    0x15
305 #define IER2    0x16
306 #define ITCR    0x18
307 #define INTVR   0x1a
308 #define IMVR    0x1c
309
310 /* MSCI Register macros */
311 #define TRB     0x20
312 #define TRBL    0x20
313 #define TRBH    0x21
314 #define SR0     0x22
315 #define SR1     0x23
316 #define SR2     0x24
317 #define SR3     0x25
318 #define FST     0x26
319 #define IE0     0x28
320 #define IE1     0x29
321 #define IE2     0x2a
322 #define FIE     0x2b
323 #define CMD     0x2c
324 #define MD0     0x2e
325 #define MD1     0x2f
326 #define MD2     0x30
327 #define CTL     0x31
328 #define SA0     0x32
329 #define SA1     0x33
330 #define IDL     0x34
331 #define TMC     0x35
332 #define RXS     0x36
333 #define TXS     0x37
334 #define TRC0    0x38
335 #define TRC1    0x39
336 #define RRC     0x3a
337 #define CST0    0x3c
338 #define CST1    0x3d
339
340 /* Timer Register Macros */
341 #define TCNT    0x60
342 #define TCNTL   0x60
343 #define TCNTH   0x61
344 #define TCONR   0x62
345 #define TCONRL  0x62
346 #define TCONRH  0x63
347 #define TMCS    0x64
348 #define TEPR    0x65
349
350 /* DMA Controller Register macros */
351 #define DARL    0x80
352 #define DARH    0x81
353 #define DARB    0x82
354 #define BAR     0x80
355 #define BARL    0x80
356 #define BARH    0x81
357 #define BARB    0x82
358 #define SAR     0x84
359 #define SARL    0x84
360 #define SARH    0x85
361 #define SARB    0x86
362 #define CPB     0x86
363 #define CDA     0x88
364 #define CDAL    0x88
365 #define CDAH    0x89
366 #define EDA     0x8a
367 #define EDAL    0x8a
368 #define EDAH    0x8b
369 #define BFL     0x8c
370 #define BFLL    0x8c
371 #define BFLH    0x8d
372 #define BCR     0x8e
373 #define BCRL    0x8e
374 #define BCRH    0x8f
375 #define DSR     0x90
376 #define DMR     0x91
377 #define FCT     0x93
378 #define DIR     0x94
379 #define DCMD    0x95
380
381 /* combine with timer or DMA register address */
382 #define TIMER0  0x00
383 #define TIMER1  0x08
384 #define TIMER2  0x10
385 #define TIMER3  0x18
386 #define RXDMA   0x00
387 #define TXDMA   0x20
388
389 /* SCA Command Codes */
390 #define NOOP            0x00
391 #define TXRESET         0x01
392 #define TXENABLE        0x02
393 #define TXDISABLE       0x03
394 #define TXCRCINIT       0x04
395 #define TXCRCEXCL       0x05
396 #define TXEOM           0x06
397 #define TXABORT         0x07
398 #define MPON            0x08
399 #define TXBUFCLR        0x09
400 #define RXRESET         0x11
401 #define RXENABLE        0x12
402 #define RXDISABLE       0x13
403 #define RXCRCINIT       0x14
404 #define RXREJECT        0x15
405 #define SEARCHMP        0x16
406 #define RXCRCEXCL       0x17
407 #define RXCRCCALC       0x18
408 #define CHRESET         0x21
409 #define HUNT            0x31
410
411 /* DMA command codes */
412 #define SWABORT         0x01
413 #define FEICLEAR        0x02
414
415 /* IE0 */
416 #define TXINTE          BIT7
417 #define RXINTE          BIT6
418 #define TXRDYE          BIT1
419 #define RXRDYE          BIT0
420
421 /* IE1 & SR1 */
422 #define UDRN    BIT7
423 #define IDLE    BIT6
424 #define SYNCD   BIT4
425 #define FLGD    BIT4
426 #define CCTS    BIT3
427 #define CDCD    BIT2
428 #define BRKD    BIT1
429 #define ABTD    BIT1
430 #define GAPD    BIT1
431 #define BRKE    BIT0
432 #define IDLD    BIT0
433
434 /* IE2 & SR2 */
435 #define EOM     BIT7
436 #define PMP     BIT6
437 #define SHRT    BIT6
438 #define PE      BIT5
439 #define ABT     BIT5
440 #define FRME    BIT4
441 #define RBIT    BIT4
442 #define OVRN    BIT3
443 #define CRCE    BIT2
444
445
446 /*
447  * Global linked list of SyncLink devices
448  */
449 static SLMP_INFO *synclinkmp_device_list = NULL;
450 static int synclinkmp_adapter_count = -1;
451 static int synclinkmp_device_count = 0;
452
453 /*
454  * Set this param to non-zero to load eax with the
455  * .text section address and breakpoint on module load.
456  * This is useful for use with gdb and add-symbol-file command.
457  */
458 static bool break_on_load = 0;
459
460 /*
461  * Driver major number, defaults to zero to get auto
462  * assigned major number. May be forced as module parameter.
463  */
464 static int ttymajor = 0;
465
466 /*
467  * Array of user specified options for ISA adapters.
468  */
469 static int debug_level = 0;
470 static int maxframe[MAX_DEVICES] = {0,};
471
472 module_param(break_on_load, bool, 0);
473 module_param(ttymajor, int, 0);
474 module_param(debug_level, int, 0);
475 module_param_array(maxframe, int, NULL, 0);
476
477 static char *driver_name = "SyncLink MultiPort driver";
478 static char *driver_version = "$Revision: 4.38 $";
479
480 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
481 static void synclinkmp_remove_one(struct pci_dev *dev);
482
483 static struct pci_device_id synclinkmp_pci_tbl[] = {
484         { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
485         { 0, }, /* terminate list */
486 };
487 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
488
489 MODULE_LICENSE("GPL");
490
491 static struct pci_driver synclinkmp_pci_driver = {
492         .name           = "synclinkmp",
493         .id_table       = synclinkmp_pci_tbl,
494         .probe          = synclinkmp_init_one,
495         .remove         = __devexit_p(synclinkmp_remove_one),
496 };
497
498
499 static struct tty_driver *serial_driver;
500
501 /* number of characters left in xmit buffer before we ask for more */
502 #define WAKEUP_CHARS 256
503
504
505 /* tty callbacks */
506
507 static int  open(struct tty_struct *tty, struct file * filp);
508 static void close(struct tty_struct *tty, struct file * filp);
509 static void hangup(struct tty_struct *tty);
510 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
511
512 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
513 static int put_char(struct tty_struct *tty, unsigned char ch);
514 static void send_xchar(struct tty_struct *tty, char ch);
515 static void wait_until_sent(struct tty_struct *tty, int timeout);
516 static int  write_room(struct tty_struct *tty);
517 static void flush_chars(struct tty_struct *tty);
518 static void flush_buffer(struct tty_struct *tty);
519 static void tx_hold(struct tty_struct *tty);
520 static void tx_release(struct tty_struct *tty);
521
522 static int  ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
523 static int  chars_in_buffer(struct tty_struct *tty);
524 static void throttle(struct tty_struct * tty);
525 static void unthrottle(struct tty_struct * tty);
526 static int set_break(struct tty_struct *tty, int break_state);
527
528 #if SYNCLINK_GENERIC_HDLC
529 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
530 static void hdlcdev_tx_done(SLMP_INFO *info);
531 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
532 static int  hdlcdev_init(SLMP_INFO *info);
533 static void hdlcdev_exit(SLMP_INFO *info);
534 #endif
535
536 /* ioctl handlers */
537
538 static int  get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
539 static int  get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
540 static int  set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
541 static int  get_txidle(SLMP_INFO *info, int __user *idle_mode);
542 static int  set_txidle(SLMP_INFO *info, int idle_mode);
543 static int  tx_enable(SLMP_INFO *info, int enable);
544 static int  tx_abort(SLMP_INFO *info);
545 static int  rx_enable(SLMP_INFO *info, int enable);
546 static int  modem_input_wait(SLMP_INFO *info,int arg);
547 static int  wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
548 static int  tiocmget(struct tty_struct *tty);
549 static int  tiocmset(struct tty_struct *tty,
550                         unsigned int set, unsigned int clear);
551 static int  set_break(struct tty_struct *tty, int break_state);
552
553 static void add_device(SLMP_INFO *info);
554 static void device_init(int adapter_num, struct pci_dev *pdev);
555 static int  claim_resources(SLMP_INFO *info);
556 static void release_resources(SLMP_INFO *info);
557
558 static int  startup(SLMP_INFO *info);
559 static int  block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
560 static int carrier_raised(struct tty_port *port);
561 static void shutdown(SLMP_INFO *info);
562 static void program_hw(SLMP_INFO *info);
563 static void change_params(SLMP_INFO *info);
564
565 static bool init_adapter(SLMP_INFO *info);
566 static bool register_test(SLMP_INFO *info);
567 static bool irq_test(SLMP_INFO *info);
568 static bool loopback_test(SLMP_INFO *info);
569 static int  adapter_test(SLMP_INFO *info);
570 static bool memory_test(SLMP_INFO *info);
571
572 static void reset_adapter(SLMP_INFO *info);
573 static void reset_port(SLMP_INFO *info);
574 static void async_mode(SLMP_INFO *info);
575 static void hdlc_mode(SLMP_INFO *info);
576
577 static void rx_stop(SLMP_INFO *info);
578 static void rx_start(SLMP_INFO *info);
579 static void rx_reset_buffers(SLMP_INFO *info);
580 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
581 static bool rx_get_frame(SLMP_INFO *info);
582
583 static void tx_start(SLMP_INFO *info);
584 static void tx_stop(SLMP_INFO *info);
585 static void tx_load_fifo(SLMP_INFO *info);
586 static void tx_set_idle(SLMP_INFO *info);
587 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
588
589 static void get_signals(SLMP_INFO *info);
590 static void set_signals(SLMP_INFO *info);
591 static void enable_loopback(SLMP_INFO *info, int enable);
592 static void set_rate(SLMP_INFO *info, u32 data_rate);
593
594 static int  bh_action(SLMP_INFO *info);
595 static void bh_handler(struct work_struct *work);
596 static void bh_receive(SLMP_INFO *info);
597 static void bh_transmit(SLMP_INFO *info);
598 static void bh_status(SLMP_INFO *info);
599 static void isr_timer(SLMP_INFO *info);
600 static void isr_rxint(SLMP_INFO *info);
601 static void isr_rxrdy(SLMP_INFO *info);
602 static void isr_txint(SLMP_INFO *info);
603 static void isr_txrdy(SLMP_INFO *info);
604 static void isr_rxdmaok(SLMP_INFO *info);
605 static void isr_rxdmaerror(SLMP_INFO *info);
606 static void isr_txdmaok(SLMP_INFO *info);
607 static void isr_txdmaerror(SLMP_INFO *info);
608 static void isr_io_pin(SLMP_INFO *info, u16 status);
609
610 static int  alloc_dma_bufs(SLMP_INFO *info);
611 static void free_dma_bufs(SLMP_INFO *info);
612 static int  alloc_buf_list(SLMP_INFO *info);
613 static int  alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
614 static int  alloc_tmp_rx_buf(SLMP_INFO *info);
615 static void free_tmp_rx_buf(SLMP_INFO *info);
616
617 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
618 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
619 static void tx_timeout(unsigned long context);
620 static void status_timeout(unsigned long context);
621
622 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
623 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
624 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
625 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
626 static unsigned char read_status_reg(SLMP_INFO * info);
627 static void write_control_reg(SLMP_INFO * info);
628
629
630 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
631 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
632 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
633
634 static u32 misc_ctrl_value = 0x007e4040;
635 static u32 lcr1_brdr_value = 0x00800028;
636
637 static u32 read_ahead_count = 8;
638
639 /* DPCR, DMA Priority Control
640  *
641  * 07..05  Not used, must be 0
642  * 04      BRC, bus release condition: 0=all transfers complete
643  *              1=release after 1 xfer on all channels
644  * 03      CCC, channel change condition: 0=every cycle
645  *              1=after each channel completes all xfers
646  * 02..00  PR<2..0>, priority 100=round robin
647  *
648  * 00000100 = 0x00
649  */
650 static unsigned char dma_priority = 0x04;
651
652 // Number of bytes that can be written to shared RAM
653 // in a single write operation
654 static u32 sca_pci_load_interval = 64;
655
656 /*
657  * 1st function defined in .text section. Calling this function in
658  * init_module() followed by a breakpoint allows a remote debugger
659  * (gdb) to get the .text address for the add-symbol-file command.
660  * This allows remote debugging of dynamically loadable modules.
661  */
662 static void* synclinkmp_get_text_ptr(void);
663 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
664
665 static inline int sanity_check(SLMP_INFO *info,
666                                char *name, const char *routine)
667 {
668 #ifdef SANITY_CHECK
669         static const char *badmagic =
670                 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
671         static const char *badinfo =
672                 "Warning: null synclinkmp_struct for (%s) in %s\n";
673
674         if (!info) {
675                 printk(badinfo, name, routine);
676                 return 1;
677         }
678         if (info->magic != MGSL_MAGIC) {
679                 printk(badmagic, name, routine);
680                 return 1;
681         }
682 #else
683         if (!info)
684                 return 1;
685 #endif
686         return 0;
687 }
688
689 /**
690  * line discipline callback wrappers
691  *
692  * The wrappers maintain line discipline references
693  * while calling into the line discipline.
694  *
695  * ldisc_receive_buf  - pass receive data to line discipline
696  */
697
698 static void ldisc_receive_buf(struct tty_struct *tty,
699                               const __u8 *data, char *flags, int count)
700 {
701         struct tty_ldisc *ld;
702         if (!tty)
703                 return;
704         ld = tty_ldisc_ref(tty);
705         if (ld) {
706                 if (ld->ops->receive_buf)
707                         ld->ops->receive_buf(tty, data, flags, count);
708                 tty_ldisc_deref(ld);
709         }
710 }
711
712 /* tty callbacks */
713
714 static int install(struct tty_driver *driver, struct tty_struct *tty)
715 {
716         SLMP_INFO *info;
717         int line = tty->index;
718
719         if (line >= synclinkmp_device_count) {
720                 printk("%s(%d): open with invalid line #%d.\n",
721                         __FILE__,__LINE__,line);
722                 return -ENODEV;
723         }
724
725         info = synclinkmp_device_list;
726         while (info && info->line != line)
727                 info = info->next_device;
728         if (sanity_check(info, tty->name, "open"))
729                 return -ENODEV;
730         if (info->init_error) {
731                 printk("%s(%d):%s device is not allocated, init error=%d\n",
732                         __FILE__, __LINE__, info->device_name,
733                         info->init_error);
734                 return -ENODEV;
735         }
736
737         tty->driver_data = info;
738
739         return tty_port_install(&info->port, driver, tty);
740 }
741
742 /* Called when a port is opened.  Init and enable port.
743  */
744 static int open(struct tty_struct *tty, struct file *filp)
745 {
746         SLMP_INFO *info = tty->driver_data;
747         unsigned long flags;
748         int retval;
749
750         info->port.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->port.count);
755
756         /* If port is closing, signal caller to try again */
757         if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
758                 if (info->port.flags & ASYNC_CLOSING)
759                         interruptible_sleep_on(&info->port.close_wait);
760                 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
761                         -EAGAIN : -ERESTARTSYS);
762                 goto cleanup;
763         }
764
765         info->port.tty->low_latency = (info->port.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->port.count++;
774         spin_unlock_irqrestore(&info->netlock, flags);
775
776         if (info->port.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->port.tty = NULL; /* tty layer will release tty struct */
800                 if(info->port.count)
801                         info->port.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 = 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->port.count);
820
821         if (tty_port_close_start(&info->port, tty, filp) == 0)
822                 goto cleanup;
823
824         mutex_lock(&info->port.mutex);
825         if (info->port.flags & ASYNC_INITIALIZED)
826                 wait_until_sent(tty, info->timeout);
827
828         flush_buffer(tty);
829         tty_ldisc_flush(tty);
830         shutdown(info);
831         mutex_unlock(&info->port.mutex);
832
833         tty_port_close_end(&info->port, tty);
834         info->port.tty = NULL;
835 cleanup:
836         if (debug_level >= DEBUG_LEVEL_INFO)
837                 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
838                         tty->driver->name, info->port.count);
839 }
840
841 /* Called by tty_hangup() when a hangup is signaled.
842  * This is the same as closing all open descriptors for the port.
843  */
844 static void hangup(struct tty_struct *tty)
845 {
846         SLMP_INFO *info = tty->driver_data;
847         unsigned long flags;
848
849         if (debug_level >= DEBUG_LEVEL_INFO)
850                 printk("%s(%d):%s hangup()\n",
851                          __FILE__,__LINE__, info->device_name );
852
853         if (sanity_check(info, tty->name, "hangup"))
854                 return;
855
856         mutex_lock(&info->port.mutex);
857         flush_buffer(tty);
858         shutdown(info);
859
860         spin_lock_irqsave(&info->port.lock, flags);
861         info->port.count = 0;
862         info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
863         info->port.tty = NULL;
864         spin_unlock_irqrestore(&info->port.lock, flags);
865         mutex_unlock(&info->port.mutex);
866
867         wake_up_interruptible(&info->port.open_wait);
868 }
869
870 /* Set new termios settings
871  */
872 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
873 {
874         SLMP_INFO *info = tty->driver_data;
875         unsigned long flags;
876
877         if (debug_level >= DEBUG_LEVEL_INFO)
878                 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
879                         tty->driver->name );
880
881         change_params(info);
882
883         /* Handle transition to B0 status */
884         if (old_termios->c_cflag & CBAUD &&
885             !(tty->termios.c_cflag & CBAUD)) {
886                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
887                 spin_lock_irqsave(&info->lock,flags);
888                 set_signals(info);
889                 spin_unlock_irqrestore(&info->lock,flags);
890         }
891
892         /* Handle transition away from B0 status */
893         if (!(old_termios->c_cflag & CBAUD) &&
894             tty->termios.c_cflag & CBAUD) {
895                 info->serial_signals |= SerialSignal_DTR;
896                 if (!(tty->termios.c_cflag & CRTSCTS) ||
897                     !test_bit(TTY_THROTTLED, &tty->flags)) {
898                         info->serial_signals |= SerialSignal_RTS;
899                 }
900                 spin_lock_irqsave(&info->lock,flags);
901                 set_signals(info);
902                 spin_unlock_irqrestore(&info->lock,flags);
903         }
904
905         /* Handle turning off CRTSCTS */
906         if (old_termios->c_cflag & CRTSCTS &&
907             !(tty->termios.c_cflag & CRTSCTS)) {
908                 tty->hw_stopped = 0;
909                 tx_release(tty);
910         }
911 }
912
913 /* Send a block of data
914  *
915  * Arguments:
916  *
917  *      tty             pointer to tty information structure
918  *      buf             pointer to buffer containing send data
919  *      count           size of send data in bytes
920  *
921  * Return Value:        number of characters written
922  */
923 static int write(struct tty_struct *tty,
924                  const unsigned char *buf, int count)
925 {
926         int     c, ret = 0;
927         SLMP_INFO *info = tty->driver_data;
928         unsigned long flags;
929
930         if (debug_level >= DEBUG_LEVEL_INFO)
931                 printk("%s(%d):%s write() count=%d\n",
932                        __FILE__,__LINE__,info->device_name,count);
933
934         if (sanity_check(info, tty->name, "write"))
935                 goto cleanup;
936
937         if (!info->tx_buf)
938                 goto cleanup;
939
940         if (info->params.mode == MGSL_MODE_HDLC) {
941                 if (count > info->max_frame_size) {
942                         ret = -EIO;
943                         goto cleanup;
944                 }
945                 if (info->tx_active)
946                         goto cleanup;
947                 if (info->tx_count) {
948                         /* send accumulated data from send_char() calls */
949                         /* as frame and wait before accepting more data. */
950                         tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
951                         goto start;
952                 }
953                 ret = info->tx_count = count;
954                 tx_load_dma_buffer(info, buf, count);
955                 goto start;
956         }
957
958         for (;;) {
959                 c = min_t(int, count,
960                         min(info->max_frame_size - info->tx_count - 1,
961                             info->max_frame_size - info->tx_put));
962                 if (c <= 0)
963                         break;
964                         
965                 memcpy(info->tx_buf + info->tx_put, buf, c);
966
967                 spin_lock_irqsave(&info->lock,flags);
968                 info->tx_put += c;
969                 if (info->tx_put >= info->max_frame_size)
970                         info->tx_put -= info->max_frame_size;
971                 info->tx_count += c;
972                 spin_unlock_irqrestore(&info->lock,flags);
973
974                 buf += c;
975                 count -= c;
976                 ret += c;
977         }
978
979         if (info->params.mode == MGSL_MODE_HDLC) {
980                 if (count) {
981                         ret = info->tx_count = 0;
982                         goto cleanup;
983                 }
984                 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
985         }
986 start:
987         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
988                 spin_lock_irqsave(&info->lock,flags);
989                 if (!info->tx_active)
990                         tx_start(info);
991                 spin_unlock_irqrestore(&info->lock,flags);
992         }
993
994 cleanup:
995         if (debug_level >= DEBUG_LEVEL_INFO)
996                 printk( "%s(%d):%s write() returning=%d\n",
997                         __FILE__,__LINE__,info->device_name,ret);
998         return ret;
999 }
1000
1001 /* Add a character to the transmit buffer.
1002  */
1003 static int put_char(struct tty_struct *tty, unsigned char ch)
1004 {
1005         SLMP_INFO *info = tty->driver_data;
1006         unsigned long flags;
1007         int ret = 0;
1008
1009         if ( debug_level >= DEBUG_LEVEL_INFO ) {
1010                 printk( "%s(%d):%s put_char(%d)\n",
1011                         __FILE__,__LINE__,info->device_name,ch);
1012         }
1013
1014         if (sanity_check(info, tty->name, "put_char"))
1015                 return 0;
1016
1017         if (!info->tx_buf)
1018                 return 0;
1019
1020         spin_lock_irqsave(&info->lock,flags);
1021
1022         if ( (info->params.mode != MGSL_MODE_HDLC) ||
1023              !info->tx_active ) {
1024
1025                 if (info->tx_count < info->max_frame_size - 1) {
1026                         info->tx_buf[info->tx_put++] = ch;
1027                         if (info->tx_put >= info->max_frame_size)
1028                                 info->tx_put -= info->max_frame_size;
1029                         info->tx_count++;
1030                         ret = 1;
1031                 }
1032         }
1033
1034         spin_unlock_irqrestore(&info->lock,flags);
1035         return ret;
1036 }
1037
1038 /* Send a high-priority XON/XOFF character
1039  */
1040 static void send_xchar(struct tty_struct *tty, char ch)
1041 {
1042         SLMP_INFO *info = tty->driver_data;
1043         unsigned long flags;
1044
1045         if (debug_level >= DEBUG_LEVEL_INFO)
1046                 printk("%s(%d):%s send_xchar(%d)\n",
1047                          __FILE__,__LINE__, info->device_name, ch );
1048
1049         if (sanity_check(info, tty->name, "send_xchar"))
1050                 return;
1051
1052         info->x_char = ch;
1053         if (ch) {
1054                 /* Make sure transmit interrupts are on */
1055                 spin_lock_irqsave(&info->lock,flags);
1056                 if (!info->tx_enabled)
1057                         tx_start(info);
1058                 spin_unlock_irqrestore(&info->lock,flags);
1059         }
1060 }
1061
1062 /* Wait until the transmitter is empty.
1063  */
1064 static void wait_until_sent(struct tty_struct *tty, int timeout)
1065 {
1066         SLMP_INFO * info = tty->driver_data;
1067         unsigned long orig_jiffies, char_time;
1068
1069         if (!info )
1070                 return;
1071
1072         if (debug_level >= DEBUG_LEVEL_INFO)
1073                 printk("%s(%d):%s wait_until_sent() entry\n",
1074                          __FILE__,__LINE__, info->device_name );
1075
1076         if (sanity_check(info, tty->name, "wait_until_sent"))
1077                 return;
1078
1079         if (!test_bit(ASYNCB_INITIALIZED, &info->port.flags))
1080                 goto exit;
1081
1082         orig_jiffies = jiffies;
1083
1084         /* Set check interval to 1/5 of estimated time to
1085          * send a character, and make it at least 1. The check
1086          * interval should also be less than the timeout.
1087          * Note: use tight timings here to satisfy the NIST-PCTS.
1088          */
1089
1090         if ( info->params.data_rate ) {
1091                 char_time = info->timeout/(32 * 5);
1092                 if (!char_time)
1093                         char_time++;
1094         } else
1095                 char_time = 1;
1096
1097         if (timeout)
1098                 char_time = min_t(unsigned long, char_time, timeout);
1099
1100         if ( info->params.mode == MGSL_MODE_HDLC ) {
1101                 while (info->tx_active) {
1102                         msleep_interruptible(jiffies_to_msecs(char_time));
1103                         if (signal_pending(current))
1104                                 break;
1105                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1106                                 break;
1107                 }
1108         } else {
1109                 /*
1110                  * TODO: determine if there is something similar to USC16C32
1111                  *       TXSTATUS_ALL_SENT status
1112                  */
1113                 while ( info->tx_active && info->tx_enabled) {
1114                         msleep_interruptible(jiffies_to_msecs(char_time));
1115                         if (signal_pending(current))
1116                                 break;
1117                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1118                                 break;
1119                 }
1120         }
1121
1122 exit:
1123         if (debug_level >= DEBUG_LEVEL_INFO)
1124                 printk("%s(%d):%s wait_until_sent() exit\n",
1125                          __FILE__,__LINE__, info->device_name );
1126 }
1127
1128 /* Return the count of free bytes in transmit buffer
1129  */
1130 static int write_room(struct tty_struct *tty)
1131 {
1132         SLMP_INFO *info = tty->driver_data;
1133         int ret;
1134
1135         if (sanity_check(info, tty->name, "write_room"))
1136                 return 0;
1137
1138         if (info->params.mode == MGSL_MODE_HDLC) {
1139                 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1140         } else {
1141                 ret = info->max_frame_size - info->tx_count - 1;
1142                 if (ret < 0)
1143                         ret = 0;
1144         }
1145
1146         if (debug_level >= DEBUG_LEVEL_INFO)
1147                 printk("%s(%d):%s write_room()=%d\n",
1148                        __FILE__, __LINE__, info->device_name, ret);
1149
1150         return ret;
1151 }
1152
1153 /* enable transmitter and send remaining buffered characters
1154  */
1155 static void flush_chars(struct tty_struct *tty)
1156 {
1157         SLMP_INFO *info = tty->driver_data;
1158         unsigned long flags;
1159
1160         if ( debug_level >= DEBUG_LEVEL_INFO )
1161                 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1162                         __FILE__,__LINE__,info->device_name,info->tx_count);
1163
1164         if (sanity_check(info, tty->name, "flush_chars"))
1165                 return;
1166
1167         if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1168             !info->tx_buf)
1169                 return;
1170
1171         if ( debug_level >= DEBUG_LEVEL_INFO )
1172                 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1173                         __FILE__,__LINE__,info->device_name );
1174
1175         spin_lock_irqsave(&info->lock,flags);
1176
1177         if (!info->tx_active) {
1178                 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1179                         info->tx_count ) {
1180                         /* operating in synchronous (frame oriented) mode */
1181                         /* copy data from circular tx_buf to */
1182                         /* transmit DMA buffer. */
1183                         tx_load_dma_buffer(info,
1184                                  info->tx_buf,info->tx_count);
1185                 }
1186                 tx_start(info);
1187         }
1188
1189         spin_unlock_irqrestore(&info->lock,flags);
1190 }
1191
1192 /* Discard all data in the send buffer
1193  */
1194 static void flush_buffer(struct tty_struct *tty)
1195 {
1196         SLMP_INFO *info = tty->driver_data;
1197         unsigned long flags;
1198
1199         if (debug_level >= DEBUG_LEVEL_INFO)
1200                 printk("%s(%d):%s flush_buffer() entry\n",
1201                          __FILE__,__LINE__, info->device_name );
1202
1203         if (sanity_check(info, tty->name, "flush_buffer"))
1204                 return;
1205
1206         spin_lock_irqsave(&info->lock,flags);
1207         info->tx_count = info->tx_put = info->tx_get = 0;
1208         del_timer(&info->tx_timer);
1209         spin_unlock_irqrestore(&info->lock,flags);
1210
1211         tty_wakeup(tty);
1212 }
1213
1214 /* throttle (stop) transmitter
1215  */
1216 static void tx_hold(struct tty_struct *tty)
1217 {
1218         SLMP_INFO *info = tty->driver_data;
1219         unsigned long flags;
1220
1221         if (sanity_check(info, tty->name, "tx_hold"))
1222                 return;
1223
1224         if ( debug_level >= DEBUG_LEVEL_INFO )
1225                 printk("%s(%d):%s tx_hold()\n",
1226                         __FILE__,__LINE__,info->device_name);
1227
1228         spin_lock_irqsave(&info->lock,flags);
1229         if (info->tx_enabled)
1230                 tx_stop(info);
1231         spin_unlock_irqrestore(&info->lock,flags);
1232 }
1233
1234 /* release (start) transmitter
1235  */
1236 static void tx_release(struct tty_struct *tty)
1237 {
1238         SLMP_INFO *info = tty->driver_data;
1239         unsigned long flags;
1240
1241         if (sanity_check(info, tty->name, "tx_release"))
1242                 return;
1243
1244         if ( debug_level >= DEBUG_LEVEL_INFO )
1245                 printk("%s(%d):%s tx_release()\n",
1246                         __FILE__,__LINE__,info->device_name);
1247
1248         spin_lock_irqsave(&info->lock,flags);
1249         if (!info->tx_enabled)
1250                 tx_start(info);
1251         spin_unlock_irqrestore(&info->lock,flags);
1252 }
1253
1254 /* Service an IOCTL request
1255  *
1256  * Arguments:
1257  *
1258  *      tty     pointer to tty instance data
1259  *      cmd     IOCTL command code
1260  *      arg     command argument/context
1261  *
1262  * Return Value:        0 if success, otherwise error code
1263  */
1264 static int ioctl(struct tty_struct *tty,
1265                  unsigned int cmd, unsigned long arg)
1266 {
1267         SLMP_INFO *info = tty->driver_data;
1268         void __user *argp = (void __user *)arg;
1269
1270         if (debug_level >= DEBUG_LEVEL_INFO)
1271                 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1272                         info->device_name, cmd );
1273
1274         if (sanity_check(info, tty->name, "ioctl"))
1275                 return -ENODEV;
1276
1277         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1278             (cmd != TIOCMIWAIT)) {
1279                 if (tty->flags & (1 << TTY_IO_ERROR))
1280                     return -EIO;
1281         }
1282
1283         switch (cmd) {
1284         case MGSL_IOCGPARAMS:
1285                 return get_params(info, argp);
1286         case MGSL_IOCSPARAMS:
1287                 return set_params(info, argp);
1288         case MGSL_IOCGTXIDLE:
1289                 return get_txidle(info, argp);
1290         case MGSL_IOCSTXIDLE:
1291                 return set_txidle(info, (int)arg);
1292         case MGSL_IOCTXENABLE:
1293                 return tx_enable(info, (int)arg);
1294         case MGSL_IOCRXENABLE:
1295                 return rx_enable(info, (int)arg);
1296         case MGSL_IOCTXABORT:
1297                 return tx_abort(info);
1298         case MGSL_IOCGSTATS:
1299                 return get_stats(info, argp);
1300         case MGSL_IOCWAITEVENT:
1301                 return wait_mgsl_event(info, argp);
1302         case MGSL_IOCLOOPTXDONE:
1303                 return 0; // TODO: Not supported, need to document
1304                 /* Wait for modem input (DCD,RI,DSR,CTS) change
1305                  * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1306                  */
1307         case TIOCMIWAIT:
1308                 return modem_input_wait(info,(int)arg);
1309                 
1310                 /*
1311                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1312                  * Return: write counters to the user passed counter struct
1313                  * NB: both 1->0 and 0->1 transitions are counted except for
1314                  *     RI where only 0->1 is counted.
1315                  */
1316         default:
1317                 return -ENOIOCTLCMD;
1318         }
1319         return 0;
1320 }
1321
1322 static int get_icount(struct tty_struct *tty,
1323                                 struct serial_icounter_struct *icount)
1324 {
1325         SLMP_INFO *info = tty->driver_data;
1326         struct mgsl_icount cnow;        /* kernel counter temps */
1327         unsigned long flags;
1328
1329         spin_lock_irqsave(&info->lock,flags);
1330         cnow = info->icount;
1331         spin_unlock_irqrestore(&info->lock,flags);
1332
1333         icount->cts = cnow.cts;
1334         icount->dsr = cnow.dsr;
1335         icount->rng = cnow.rng;
1336         icount->dcd = cnow.dcd;
1337         icount->rx = cnow.rx;
1338         icount->tx = cnow.tx;
1339         icount->frame = cnow.frame;
1340         icount->overrun = cnow.overrun;
1341         icount->parity = cnow.parity;
1342         icount->brk = cnow.brk;
1343         icount->buf_overrun = cnow.buf_overrun;
1344
1345         return 0;
1346 }
1347
1348 /*
1349  * /proc fs routines....
1350  */
1351
1352 static inline void line_info(struct seq_file *m, SLMP_INFO *info)
1353 {
1354         char    stat_buf[30];
1355         unsigned long flags;
1356
1357         seq_printf(m, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1358                        "\tIRQ=%d MaxFrameSize=%u\n",
1359                 info->device_name,
1360                 info->phys_sca_base,
1361                 info->phys_memory_base,
1362                 info->phys_statctrl_base,
1363                 info->phys_lcr_base,
1364                 info->irq_level,
1365                 info->max_frame_size );
1366
1367         /* output current serial signal states */
1368         spin_lock_irqsave(&info->lock,flags);
1369         get_signals(info);
1370         spin_unlock_irqrestore(&info->lock,flags);
1371
1372         stat_buf[0] = 0;
1373         stat_buf[1] = 0;
1374         if (info->serial_signals & SerialSignal_RTS)
1375                 strcat(stat_buf, "|RTS");
1376         if (info->serial_signals & SerialSignal_CTS)
1377                 strcat(stat_buf, "|CTS");
1378         if (info->serial_signals & SerialSignal_DTR)
1379                 strcat(stat_buf, "|DTR");
1380         if (info->serial_signals & SerialSignal_DSR)
1381                 strcat(stat_buf, "|DSR");
1382         if (info->serial_signals & SerialSignal_DCD)
1383                 strcat(stat_buf, "|CD");
1384         if (info->serial_signals & SerialSignal_RI)
1385                 strcat(stat_buf, "|RI");
1386
1387         if (info->params.mode == MGSL_MODE_HDLC) {
1388                 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1389                               info->icount.txok, info->icount.rxok);
1390                 if (info->icount.txunder)
1391                         seq_printf(m, " txunder:%d", info->icount.txunder);
1392                 if (info->icount.txabort)
1393                         seq_printf(m, " txabort:%d", info->icount.txabort);
1394                 if (info->icount.rxshort)
1395                         seq_printf(m, " rxshort:%d", info->icount.rxshort);
1396                 if (info->icount.rxlong)
1397                         seq_printf(m, " rxlong:%d", info->icount.rxlong);
1398                 if (info->icount.rxover)
1399                         seq_printf(m, " rxover:%d", info->icount.rxover);
1400                 if (info->icount.rxcrc)
1401                         seq_printf(m, " rxlong:%d", info->icount.rxcrc);
1402         } else {
1403                 seq_printf(m, "\tASYNC tx:%d rx:%d",
1404                               info->icount.tx, info->icount.rx);
1405                 if (info->icount.frame)
1406                         seq_printf(m, " fe:%d", info->icount.frame);
1407                 if (info->icount.parity)
1408                         seq_printf(m, " pe:%d", info->icount.parity);
1409                 if (info->icount.brk)
1410                         seq_printf(m, " brk:%d", info->icount.brk);
1411                 if (info->icount.overrun)
1412                         seq_printf(m, " oe:%d", info->icount.overrun);
1413         }
1414
1415         /* Append serial signal status to end */
1416         seq_printf(m, " %s\n", stat_buf+1);
1417
1418         seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1419          info->tx_active,info->bh_requested,info->bh_running,
1420          info->pending_bh);
1421 }
1422
1423 /* Called to print information about devices
1424  */
1425 static int synclinkmp_proc_show(struct seq_file *m, void *v)
1426 {
1427         SLMP_INFO *info;
1428
1429         seq_printf(m, "synclinkmp driver:%s\n", driver_version);
1430
1431         info = synclinkmp_device_list;
1432         while( info ) {
1433                 line_info(m, info);
1434                 info = info->next_device;
1435         }
1436         return 0;
1437 }
1438
1439 static int synclinkmp_proc_open(struct inode *inode, struct file *file)
1440 {
1441         return single_open(file, synclinkmp_proc_show, NULL);
1442 }
1443
1444 static const struct file_operations synclinkmp_proc_fops = {
1445         .owner          = THIS_MODULE,
1446         .open           = synclinkmp_proc_open,
1447         .read           = seq_read,
1448         .llseek         = seq_lseek,
1449         .release        = single_release,
1450 };
1451
1452 /* Return the count of bytes in transmit buffer
1453  */
1454 static int chars_in_buffer(struct tty_struct *tty)
1455 {
1456         SLMP_INFO *info = tty->driver_data;
1457
1458         if (sanity_check(info, tty->name, "chars_in_buffer"))
1459                 return 0;
1460
1461         if (debug_level >= DEBUG_LEVEL_INFO)
1462                 printk("%s(%d):%s chars_in_buffer()=%d\n",
1463                        __FILE__, __LINE__, info->device_name, info->tx_count);
1464
1465         return info->tx_count;
1466 }
1467
1468 /* Signal remote device to throttle send data (our receive data)
1469  */
1470 static void throttle(struct tty_struct * tty)
1471 {
1472         SLMP_INFO *info = tty->driver_data;
1473         unsigned long flags;
1474
1475         if (debug_level >= DEBUG_LEVEL_INFO)
1476                 printk("%s(%d):%s throttle() entry\n",
1477                          __FILE__,__LINE__, info->device_name );
1478
1479         if (sanity_check(info, tty->name, "throttle"))
1480                 return;
1481
1482         if (I_IXOFF(tty))
1483                 send_xchar(tty, STOP_CHAR(tty));
1484
1485         if (tty->termios.c_cflag & CRTSCTS) {
1486                 spin_lock_irqsave(&info->lock,flags);
1487                 info->serial_signals &= ~SerialSignal_RTS;
1488                 set_signals(info);
1489                 spin_unlock_irqrestore(&info->lock,flags);
1490         }
1491 }
1492
1493 /* Signal remote device to stop throttling send data (our receive data)
1494  */
1495 static void unthrottle(struct tty_struct * tty)
1496 {
1497         SLMP_INFO *info = tty->driver_data;
1498         unsigned long flags;
1499
1500         if (debug_level >= DEBUG_LEVEL_INFO)
1501                 printk("%s(%d):%s unthrottle() entry\n",
1502                          __FILE__,__LINE__, info->device_name );
1503
1504         if (sanity_check(info, tty->name, "unthrottle"))
1505                 return;
1506
1507         if (I_IXOFF(tty)) {
1508                 if (info->x_char)
1509                         info->x_char = 0;
1510                 else
1511                         send_xchar(tty, START_CHAR(tty));
1512         }
1513
1514         if (tty->termios.c_cflag & CRTSCTS) {
1515                 spin_lock_irqsave(&info->lock,flags);
1516                 info->serial_signals |= SerialSignal_RTS;
1517                 set_signals(info);
1518                 spin_unlock_irqrestore(&info->lock,flags);
1519         }
1520 }
1521
1522 /* set or clear transmit break condition
1523  * break_state  -1=set break condition, 0=clear
1524  */
1525 static int set_break(struct tty_struct *tty, int break_state)
1526 {
1527         unsigned char RegValue;
1528         SLMP_INFO * info = tty->driver_data;
1529         unsigned long flags;
1530
1531         if (debug_level >= DEBUG_LEVEL_INFO)
1532                 printk("%s(%d):%s set_break(%d)\n",
1533                          __FILE__,__LINE__, info->device_name, break_state);
1534
1535         if (sanity_check(info, tty->name, "set_break"))
1536                 return -EINVAL;
1537
1538         spin_lock_irqsave(&info->lock,flags);
1539         RegValue = read_reg(info, CTL);
1540         if (break_state == -1)
1541                 RegValue |= BIT3;
1542         else
1543                 RegValue &= ~BIT3;
1544         write_reg(info, CTL, RegValue);
1545         spin_unlock_irqrestore(&info->lock,flags);
1546         return 0;
1547 }
1548
1549 #if SYNCLINK_GENERIC_HDLC
1550
1551 /**
1552  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1553  * set encoding and frame check sequence (FCS) options
1554  *
1555  * dev       pointer to network device structure
1556  * encoding  serial encoding setting
1557  * parity    FCS setting
1558  *
1559  * returns 0 if success, otherwise error code
1560  */
1561 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1562                           unsigned short parity)
1563 {
1564         SLMP_INFO *info = dev_to_port(dev);
1565         unsigned char  new_encoding;
1566         unsigned short new_crctype;
1567
1568         /* return error if TTY interface open */
1569         if (info->port.count)
1570                 return -EBUSY;
1571
1572         switch (encoding)
1573         {
1574         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1575         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1576         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1577         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1578         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1579         default: return -EINVAL;
1580         }
1581
1582         switch (parity)
1583         {
1584         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1585         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1586         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1587         default: return -EINVAL;
1588         }
1589
1590         info->params.encoding = new_encoding;
1591         info->params.crc_type = new_crctype;
1592
1593         /* if network interface up, reprogram hardware */
1594         if (info->netcount)
1595                 program_hw(info);
1596
1597         return 0;
1598 }
1599
1600 /**
1601  * called by generic HDLC layer to send frame
1602  *
1603  * skb  socket buffer containing HDLC frame
1604  * dev  pointer to network device structure
1605  */
1606 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1607                                       struct net_device *dev)
1608 {
1609         SLMP_INFO *info = dev_to_port(dev);
1610         unsigned long flags;
1611
1612         if (debug_level >= DEBUG_LEVEL_INFO)
1613                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1614
1615         /* stop sending until this frame completes */
1616         netif_stop_queue(dev);
1617
1618         /* copy data to device buffers */
1619         info->tx_count = skb->len;
1620         tx_load_dma_buffer(info, skb->data, skb->len);
1621
1622         /* update network statistics */
1623         dev->stats.tx_packets++;
1624         dev->stats.tx_bytes += skb->len;
1625
1626         /* done with socket buffer, so free it */
1627         dev_kfree_skb(skb);
1628
1629         /* save start time for transmit timeout detection */
1630         dev->trans_start = jiffies;
1631
1632         /* start hardware transmitter if necessary */
1633         spin_lock_irqsave(&info->lock,flags);
1634         if (!info->tx_active)
1635                 tx_start(info);
1636         spin_unlock_irqrestore(&info->lock,flags);
1637
1638         return NETDEV_TX_OK;
1639 }
1640
1641 /**
1642  * called by network layer when interface enabled
1643  * claim resources and initialize hardware
1644  *
1645  * dev  pointer to network device structure
1646  *
1647  * returns 0 if success, otherwise error code
1648  */
1649 static int hdlcdev_open(struct net_device *dev)
1650 {
1651         SLMP_INFO *info = dev_to_port(dev);
1652         int rc;
1653         unsigned long flags;
1654
1655         if (debug_level >= DEBUG_LEVEL_INFO)
1656                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1657
1658         /* generic HDLC layer open processing */
1659         if ((rc = hdlc_open(dev)))
1660                 return rc;
1661
1662         /* arbitrate between network and tty opens */
1663         spin_lock_irqsave(&info->netlock, flags);
1664         if (info->port.count != 0 || info->netcount != 0) {
1665                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1666                 spin_unlock_irqrestore(&info->netlock, flags);
1667                 return -EBUSY;
1668         }
1669         info->netcount=1;
1670         spin_unlock_irqrestore(&info->netlock, flags);
1671
1672         /* claim resources and init adapter */
1673         if ((rc = startup(info)) != 0) {
1674                 spin_lock_irqsave(&info->netlock, flags);
1675                 info->netcount=0;
1676                 spin_unlock_irqrestore(&info->netlock, flags);
1677                 return rc;
1678         }
1679
1680         /* assert DTR and RTS, apply hardware settings */
1681         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1682         program_hw(info);
1683
1684         /* enable network layer transmit */
1685         dev->trans_start = jiffies;
1686         netif_start_queue(dev);
1687
1688         /* inform generic HDLC layer of current DCD status */
1689         spin_lock_irqsave(&info->lock, flags);
1690         get_signals(info);
1691         spin_unlock_irqrestore(&info->lock, flags);
1692         if (info->serial_signals & SerialSignal_DCD)
1693                 netif_carrier_on(dev);
1694         else
1695                 netif_carrier_off(dev);
1696         return 0;
1697 }
1698
1699 /**
1700  * called by network layer when interface is disabled
1701  * shutdown hardware and release resources
1702  *
1703  * dev  pointer to network device structure
1704  *
1705  * returns 0 if success, otherwise error code
1706  */
1707 static int hdlcdev_close(struct net_device *dev)
1708 {
1709         SLMP_INFO *info = dev_to_port(dev);
1710         unsigned long flags;
1711
1712         if (debug_level >= DEBUG_LEVEL_INFO)
1713                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1714
1715         netif_stop_queue(dev);
1716
1717         /* shutdown adapter and release resources */
1718         shutdown(info);
1719
1720         hdlc_close(dev);
1721
1722         spin_lock_irqsave(&info->netlock, flags);
1723         info->netcount=0;
1724         spin_unlock_irqrestore(&info->netlock, flags);
1725
1726         return 0;
1727 }
1728
1729 /**
1730  * called by network layer to process IOCTL call to network device
1731  *
1732  * dev  pointer to network device structure
1733  * ifr  pointer to network interface request structure
1734  * cmd  IOCTL command code
1735  *
1736  * returns 0 if success, otherwise error code
1737  */
1738 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1739 {
1740         const size_t size = sizeof(sync_serial_settings);
1741         sync_serial_settings new_line;
1742         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1743         SLMP_INFO *info = dev_to_port(dev);
1744         unsigned int flags;
1745
1746         if (debug_level >= DEBUG_LEVEL_INFO)
1747                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1748
1749         /* return error if TTY interface open */
1750         if (info->port.count)
1751                 return -EBUSY;
1752
1753         if (cmd != SIOCWANDEV)
1754                 return hdlc_ioctl(dev, ifr, cmd);
1755
1756         switch(ifr->ifr_settings.type) {
1757         case IF_GET_IFACE: /* return current sync_serial_settings */
1758
1759                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1760                 if (ifr->ifr_settings.size < size) {
1761                         ifr->ifr_settings.size = size; /* data size wanted */
1762                         return -ENOBUFS;
1763                 }
1764
1765                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1766                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1767                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1768                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1769
1770                 switch (flags){
1771                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1772                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1773                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1774                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1775                 default: new_line.clock_type = CLOCK_DEFAULT;
1776                 }
1777
1778                 new_line.clock_rate = info->params.clock_speed;
1779                 new_line.loopback   = info->params.loopback ? 1:0;
1780
1781                 if (copy_to_user(line, &new_line, size))
1782                         return -EFAULT;
1783                 return 0;
1784
1785         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1786
1787                 if(!capable(CAP_NET_ADMIN))
1788                         return -EPERM;
1789                 if (copy_from_user(&new_line, line, size))
1790                         return -EFAULT;
1791
1792                 switch (new_line.clock_type)
1793                 {
1794                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1795                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1796                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1797                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1798                 case CLOCK_DEFAULT:  flags = info->params.flags &
1799                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1800                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1801                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1802                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1803                 default: return -EINVAL;
1804                 }
1805
1806                 if (new_line.loopback != 0 && new_line.loopback != 1)
1807                         return -EINVAL;
1808
1809                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1810                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1811                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1812                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1813                 info->params.flags |= flags;
1814
1815                 info->params.loopback = new_line.loopback;
1816
1817                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1818                         info->params.clock_speed = new_line.clock_rate;
1819                 else
1820                         info->params.clock_speed = 0;
1821
1822                 /* if network interface up, reprogram hardware */
1823                 if (info->netcount)
1824                         program_hw(info);
1825                 return 0;
1826
1827         default:
1828                 return hdlc_ioctl(dev, ifr, cmd);
1829         }
1830 }
1831
1832 /**
1833  * called by network layer when transmit timeout is detected
1834  *
1835  * dev  pointer to network device structure
1836  */
1837 static void hdlcdev_tx_timeout(struct net_device *dev)
1838 {
1839         SLMP_INFO *info = dev_to_port(dev);
1840         unsigned long flags;
1841
1842         if (debug_level >= DEBUG_LEVEL_INFO)
1843                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1844
1845         dev->stats.tx_errors++;
1846         dev->stats.tx_aborted_errors++;
1847
1848         spin_lock_irqsave(&info->lock,flags);
1849         tx_stop(info);
1850         spin_unlock_irqrestore(&info->lock,flags);
1851
1852         netif_wake_queue(dev);
1853 }
1854
1855 /**
1856  * called by device driver when transmit completes
1857  * reenable network layer transmit if stopped
1858  *
1859  * info  pointer to device instance information
1860  */
1861 static void hdlcdev_tx_done(SLMP_INFO *info)
1862 {
1863         if (netif_queue_stopped(info->netdev))
1864                 netif_wake_queue(info->netdev);
1865 }
1866
1867 /**
1868  * called by device driver when frame received
1869  * pass frame to network layer
1870  *
1871  * info  pointer to device instance information
1872  * buf   pointer to buffer contianing frame data
1873  * size  count of data bytes in buf
1874  */
1875 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1876 {
1877         struct sk_buff *skb = dev_alloc_skb(size);
1878         struct net_device *dev = info->netdev;
1879
1880         if (debug_level >= DEBUG_LEVEL_INFO)
1881                 printk("hdlcdev_rx(%s)\n",dev->name);
1882
1883         if (skb == NULL) {
1884                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
1885                        dev->name);
1886                 dev->stats.rx_dropped++;
1887                 return;
1888         }
1889
1890         memcpy(skb_put(skb, size), buf, size);
1891
1892         skb->protocol = hdlc_type_trans(skb, dev);
1893
1894         dev->stats.rx_packets++;
1895         dev->stats.rx_bytes += size;
1896
1897         netif_rx(skb);
1898 }
1899
1900 static const struct net_device_ops hdlcdev_ops = {
1901         .ndo_open       = hdlcdev_open,
1902         .ndo_stop       = hdlcdev_close,
1903         .ndo_change_mtu = hdlc_change_mtu,
1904         .ndo_start_xmit = hdlc_start_xmit,
1905         .ndo_do_ioctl   = hdlcdev_ioctl,
1906         .ndo_tx_timeout = hdlcdev_tx_timeout,
1907 };
1908
1909 /**
1910  * called by device driver when adding device instance
1911  * do generic HDLC initialization
1912  *
1913  * info  pointer to device instance information
1914  *
1915  * returns 0 if success, otherwise error code
1916  */
1917 static int hdlcdev_init(SLMP_INFO *info)
1918 {
1919         int rc;
1920         struct net_device *dev;
1921         hdlc_device *hdlc;
1922
1923         /* allocate and initialize network and HDLC layer objects */
1924
1925         if (!(dev = alloc_hdlcdev(info))) {
1926                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1927                 return -ENOMEM;
1928         }
1929
1930         /* for network layer reporting purposes only */
1931         dev->mem_start = info->phys_sca_base;
1932         dev->mem_end   = info->phys_sca_base + SCA_BASE_SIZE - 1;
1933         dev->irq       = info->irq_level;
1934
1935         /* network layer callbacks and settings */
1936         dev->netdev_ops     = &hdlcdev_ops;
1937         dev->watchdog_timeo = 10 * HZ;
1938         dev->tx_queue_len   = 50;
1939
1940         /* generic HDLC layer callbacks and settings */
1941         hdlc         = dev_to_hdlc(dev);
1942         hdlc->attach = hdlcdev_attach;
1943         hdlc->xmit   = hdlcdev_xmit;
1944
1945         /* register objects with HDLC layer */
1946         if ((rc = register_hdlc_device(dev))) {
1947                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1948                 free_netdev(dev);
1949                 return rc;
1950         }
1951
1952         info->netdev = dev;
1953         return 0;
1954 }
1955
1956 /**
1957  * called by device driver when removing device instance
1958  * do generic HDLC cleanup
1959  *
1960  * info  pointer to device instance information
1961  */
1962 static void hdlcdev_exit(SLMP_INFO *info)
1963 {
1964         unregister_hdlc_device(info->netdev);
1965         free_netdev(info->netdev);
1966         info->netdev = NULL;
1967 }
1968
1969 #endif /* CONFIG_HDLC */
1970
1971
1972 /* Return next bottom half action to perform.
1973  * Return Value:        BH action code or 0 if nothing to do.
1974  */
1975 static int bh_action(SLMP_INFO *info)
1976 {
1977         unsigned long flags;
1978         int rc = 0;
1979
1980         spin_lock_irqsave(&info->lock,flags);
1981
1982         if (info->pending_bh & BH_RECEIVE) {
1983                 info->pending_bh &= ~BH_RECEIVE;
1984                 rc = BH_RECEIVE;
1985         } else if (info->pending_bh & BH_TRANSMIT) {
1986                 info->pending_bh &= ~BH_TRANSMIT;
1987                 rc = BH_TRANSMIT;
1988         } else if (info->pending_bh & BH_STATUS) {
1989                 info->pending_bh &= ~BH_STATUS;
1990                 rc = BH_STATUS;
1991         }
1992
1993         if (!rc) {
1994                 /* Mark BH routine as complete */
1995                 info->bh_running = false;
1996                 info->bh_requested = false;
1997         }
1998
1999         spin_unlock_irqrestore(&info->lock,flags);
2000
2001         return rc;
2002 }
2003
2004 /* Perform bottom half processing of work items queued by ISR.
2005  */
2006 static void bh_handler(struct work_struct *work)
2007 {
2008         SLMP_INFO *info = container_of(work, SLMP_INFO, task);
2009         int action;
2010
2011         if (!info)
2012                 return;
2013
2014         if ( debug_level >= DEBUG_LEVEL_BH )
2015                 printk( "%s(%d):%s bh_handler() entry\n",
2016                         __FILE__,__LINE__,info->device_name);
2017
2018         info->bh_running = true;
2019
2020         while((action = bh_action(info)) != 0) {
2021
2022                 /* Process work item */
2023                 if ( debug_level >= DEBUG_LEVEL_BH )
2024                         printk( "%s(%d):%s bh_handler() work item action=%d\n",
2025                                 __FILE__,__LINE__,info->device_name, action);
2026
2027                 switch (action) {
2028
2029                 case BH_RECEIVE:
2030                         bh_receive(info);
2031                         break;
2032                 case BH_TRANSMIT:
2033                         bh_transmit(info);
2034                         break;
2035                 case BH_STATUS:
2036                         bh_status(info);
2037                         break;
2038                 default:
2039                         /* unknown work item ID */
2040                         printk("%s(%d):%s Unknown work item ID=%08X!\n",
2041                                 __FILE__,__LINE__,info->device_name,action);
2042                         break;
2043                 }
2044         }
2045
2046         if ( debug_level >= DEBUG_LEVEL_BH )
2047                 printk( "%s(%d):%s bh_handler() exit\n",
2048                         __FILE__,__LINE__,info->device_name);
2049 }
2050
2051 static void bh_receive(SLMP_INFO *info)
2052 {
2053         if ( debug_level >= DEBUG_LEVEL_BH )
2054                 printk( "%s(%d):%s bh_receive()\n",
2055                         __FILE__,__LINE__,info->device_name);
2056
2057         while( rx_get_frame(info) );
2058 }
2059
2060 static void bh_transmit(SLMP_INFO *info)
2061 {
2062         struct tty_struct *tty = info->port.tty;
2063
2064         if ( debug_level >= DEBUG_LEVEL_BH )
2065                 printk( "%s(%d):%s bh_transmit() entry\n",
2066                         __FILE__,__LINE__,info->device_name);
2067
2068         if (tty)
2069                 tty_wakeup(tty);
2070 }
2071
2072 static void bh_status(SLMP_INFO *info)
2073 {
2074         if ( debug_level >= DEBUG_LEVEL_BH )
2075                 printk( "%s(%d):%s bh_status() entry\n",
2076                         __FILE__,__LINE__,info->device_name);
2077
2078         info->ri_chkcount = 0;
2079         info->dsr_chkcount = 0;
2080         info->dcd_chkcount = 0;
2081         info->cts_chkcount = 0;
2082 }
2083
2084 static void isr_timer(SLMP_INFO * info)
2085 {
2086         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2087
2088         /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2089         write_reg(info, IER2, 0);
2090
2091         /* TMCS, Timer Control/Status Register
2092          *
2093          * 07      CMF, Compare match flag (read only) 1=match
2094          * 06      ECMI, CMF Interrupt Enable: 0=disabled
2095          * 05      Reserved, must be 0
2096          * 04      TME, Timer Enable
2097          * 03..00  Reserved, must be 0
2098          *
2099          * 0000 0000
2100          */
2101         write_reg(info, (unsigned char)(timer + TMCS), 0);
2102
2103         info->irq_occurred = true;
2104
2105         if ( debug_level >= DEBUG_LEVEL_ISR )
2106                 printk("%s(%d):%s isr_timer()\n",
2107                         __FILE__,__LINE__,info->device_name);
2108 }
2109
2110 static void isr_rxint(SLMP_INFO * info)
2111 {
2112         struct tty_struct *tty = info->port.tty;
2113         struct  mgsl_icount *icount = &info->icount;
2114         unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2115         unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2116
2117         /* clear status bits */
2118         if (status)
2119                 write_reg(info, SR1, status);
2120
2121         if (status2)
2122                 write_reg(info, SR2, status2);
2123         
2124         if ( debug_level >= DEBUG_LEVEL_ISR )
2125                 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2126                         __FILE__,__LINE__,info->device_name,status,status2);
2127
2128         if (info->params.mode == MGSL_MODE_ASYNC) {
2129                 if (status & BRKD) {
2130                         icount->brk++;
2131
2132                         /* process break detection if tty control
2133                          * is not set to ignore it
2134                          */
2135                         if ( tty ) {
2136                                 if (!(status & info->ignore_status_mask1)) {
2137                                         if (info->read_status_mask1 & BRKD) {
2138                                                 tty_insert_flip_char(tty, 0, TTY_BREAK);
2139                                                 if (info->port.flags & ASYNC_SAK)
2140                                                         do_SAK(tty);
2141                                         }
2142                                 }
2143                         }
2144                 }
2145         }
2146         else {
2147                 if (status & (FLGD|IDLD)) {
2148                         if (status & FLGD)
2149                                 info->icount.exithunt++;
2150                         else if (status & IDLD)
2151                                 info->icount.rxidle++;
2152                         wake_up_interruptible(&info->event_wait_q);
2153                 }
2154         }
2155
2156         if (status & CDCD) {
2157                 /* simulate a common modem status change interrupt
2158                  * for our handler
2159                  */
2160                 get_signals( info );
2161                 isr_io_pin(info,
2162                         MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2163         }
2164 }
2165
2166 /*
2167  * handle async rx data interrupts
2168  */
2169 static void isr_rxrdy(SLMP_INFO * info)
2170 {
2171         u16 status;
2172         unsigned char DataByte;
2173         struct tty_struct *tty = info->port.tty;
2174         struct  mgsl_icount *icount = &info->icount;
2175
2176         if ( debug_level >= DEBUG_LEVEL_ISR )
2177                 printk("%s(%d):%s isr_rxrdy\n",
2178                         __FILE__,__LINE__,info->device_name);
2179
2180         while((status = read_reg(info,CST0)) & BIT0)
2181         {
2182                 int flag = 0;
2183                 bool over = false;
2184                 DataByte = read_reg(info,TRB);
2185
2186                 icount->rx++;
2187
2188                 if ( status & (PE + FRME + OVRN) ) {
2189                         printk("%s(%d):%s rxerr=%04X\n",
2190                                 __FILE__,__LINE__,info->device_name,status);
2191
2192                         /* update error statistics */
2193                         if (status & PE)
2194                                 icount->parity++;
2195                         else if (status & FRME)
2196                                 icount->frame++;
2197                         else if (status & OVRN)
2198                                 icount->overrun++;
2199
2200                         /* discard char if tty control flags say so */
2201                         if (status & info->ignore_status_mask2)
2202                                 continue;
2203
2204                         status &= info->read_status_mask2;
2205
2206                         if ( tty ) {
2207                                 if (status & PE)
2208                                         flag = TTY_PARITY;
2209                                 else if (status & FRME)
2210                                         flag = TTY_FRAME;
2211                                 if (status & OVRN) {
2212                                         /* Overrun is special, since it's
2213                                          * reported immediately, and doesn't
2214                                          * affect the current character
2215                                          */
2216                                         over = true;
2217                                 }
2218                         }
2219                 }       /* end of if (error) */
2220
2221                 if ( tty ) {
2222                         tty_insert_flip_char(tty, DataByte, flag);
2223                         if (over)
2224                                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
2225                 }
2226         }
2227
2228         if ( debug_level >= DEBUG_LEVEL_ISR ) {
2229                 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2230                         __FILE__,__LINE__,info->device_name,
2231                         icount->rx,icount->brk,icount->parity,
2232                         icount->frame,icount->overrun);
2233         }
2234
2235         if ( tty )
2236                 tty_flip_buffer_push(tty);
2237 }
2238
2239 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2240 {
2241         if ( debug_level >= DEBUG_LEVEL_ISR )
2242                 printk("%s(%d):%s isr_txeom status=%02x\n",
2243                         __FILE__,__LINE__,info->device_name,status);
2244
2245         write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2246         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2247         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2248
2249         if (status & UDRN) {
2250                 write_reg(info, CMD, TXRESET);
2251                 write_reg(info, CMD, TXENABLE);
2252         } else
2253                 write_reg(info, CMD, TXBUFCLR);
2254
2255         /* disable and clear tx interrupts */
2256         info->ie0_value &= ~TXRDYE;
2257         info->ie1_value &= ~(IDLE + UDRN);
2258         write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2259         write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2260
2261         if ( info->tx_active ) {
2262                 if (info->params.mode != MGSL_MODE_ASYNC) {
2263                         if (status & UDRN)
2264                                 info->icount.txunder++;
2265                         else if (status & IDLE)
2266                                 info->icount.txok++;
2267                 }
2268
2269                 info->tx_active = false;
2270                 info->tx_count = info->tx_put = info->tx_get = 0;
2271
2272                 del_timer(&info->tx_timer);
2273
2274                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2275                         info->serial_signals &= ~SerialSignal_RTS;
2276                         info->drop_rts_on_tx_done = false;
2277                         set_signals(info);
2278                 }
2279
2280 #if SYNCLINK_GENERIC_HDLC
2281                 if (info->netcount)
2282                         hdlcdev_tx_done(info);
2283                 else
2284 #endif
2285                 {
2286                         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2287                                 tx_stop(info);
2288                                 return;
2289                         }
2290                         info->pending_bh |= BH_TRANSMIT;
2291                 }
2292         }
2293 }
2294
2295
2296 /*
2297  * handle tx status interrupts
2298  */
2299 static void isr_txint(SLMP_INFO * info)
2300 {
2301         unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2302
2303         /* clear status bits */
2304         write_reg(info, SR1, status);
2305
2306         if ( debug_level >= DEBUG_LEVEL_ISR )
2307                 printk("%s(%d):%s isr_txint status=%02x\n",
2308                         __FILE__,__LINE__,info->device_name,status);
2309
2310         if (status & (UDRN + IDLE))
2311                 isr_txeom(info, status);
2312
2313         if (status & CCTS) {
2314                 /* simulate a common modem status change interrupt
2315                  * for our handler
2316                  */
2317                 get_signals( info );
2318                 isr_io_pin(info,
2319                         MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2320
2321         }
2322 }
2323
2324 /*
2325  * handle async tx data interrupts
2326  */
2327 static void isr_txrdy(SLMP_INFO * info)
2328 {
2329         if ( debug_level >= DEBUG_LEVEL_ISR )
2330                 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2331                         __FILE__,__LINE__,info->device_name,info->tx_count);
2332
2333         if (info->params.mode != MGSL_MODE_ASYNC) {
2334                 /* disable TXRDY IRQ, enable IDLE IRQ */
2335                 info->ie0_value &= ~TXRDYE;
2336                 info->ie1_value |= IDLE;
2337                 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2338                 return;
2339         }
2340
2341         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2342                 tx_stop(info);
2343                 return;
2344         }
2345
2346         if ( info->tx_count )
2347                 tx_load_fifo( info );
2348         else {
2349                 info->tx_active = false;
2350                 info->ie0_value &= ~TXRDYE;
2351                 write_reg(info, IE0, info->ie0_value);
2352         }
2353
2354         if (info->tx_count < WAKEUP_CHARS)
2355                 info->pending_bh |= BH_TRANSMIT;
2356 }
2357
2358 static void isr_rxdmaok(SLMP_INFO * info)
2359 {
2360         /* BIT7 = EOT (end of transfer)
2361          * BIT6 = EOM (end of message/frame)
2362          */
2363         unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2364
2365         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2366         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2367
2368         if ( debug_level >= DEBUG_LEVEL_ISR )
2369                 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2370                         __FILE__,__LINE__,info->device_name,status);
2371
2372         info->pending_bh |= BH_RECEIVE;
2373 }
2374
2375 static void isr_rxdmaerror(SLMP_INFO * info)
2376 {
2377         /* BIT5 = BOF (buffer overflow)
2378          * BIT4 = COF (counter overflow)
2379          */
2380         unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2381
2382         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2383         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2384
2385         if ( debug_level >= DEBUG_LEVEL_ISR )
2386                 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2387                         __FILE__,__LINE__,info->device_name,status);
2388
2389         info->rx_overflow = true;
2390         info->pending_bh |= BH_RECEIVE;
2391 }
2392
2393 static void isr_txdmaok(SLMP_INFO * info)
2394 {
2395         unsigned char status_reg1 = read_reg(info, SR1);
2396
2397         write_reg(info, TXDMA + DIR, 0x00);     /* disable Tx DMA IRQs */
2398         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2399         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2400
2401         if ( debug_level >= DEBUG_LEVEL_ISR )
2402                 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2403                         __FILE__,__LINE__,info->device_name,status_reg1);
2404
2405         /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2406         write_reg16(info, TRC0, 0);
2407         info->ie0_value |= TXRDYE;
2408         write_reg(info, IE0, info->ie0_value);
2409 }
2410
2411 static void isr_txdmaerror(SLMP_INFO * info)
2412 {
2413         /* BIT5 = BOF (buffer overflow)
2414          * BIT4 = COF (counter overflow)
2415          */
2416         unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2417
2418         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2419         write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2420
2421         if ( debug_level >= DEBUG_LEVEL_ISR )
2422                 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2423                         __FILE__,__LINE__,info->device_name,status);
2424 }
2425
2426 /* handle input serial signal changes
2427  */
2428 static void isr_io_pin( SLMP_INFO *info, u16 status )
2429 {
2430         struct  mgsl_icount *icount;
2431
2432         if ( debug_level >= DEBUG_LEVEL_ISR )
2433                 printk("%s(%d):isr_io_pin status=%04X\n",
2434                         __FILE__,__LINE__,status);
2435
2436         if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2437                       MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2438                 icount = &info->icount;
2439                 /* update input line counters */
2440                 if (status & MISCSTATUS_RI_LATCHED) {
2441                         icount->rng++;
2442                         if ( status & SerialSignal_RI )
2443                                 info->input_signal_events.ri_up++;
2444                         else
2445                                 info->input_signal_events.ri_down++;
2446                 }
2447                 if (status & MISCSTATUS_DSR_LATCHED) {
2448                         icount->dsr++;
2449                         if ( status & SerialSignal_DSR )
2450                                 info->input_signal_events.dsr_up++;
2451                         else
2452                                 info->input_signal_events.dsr_down++;
2453                 }
2454                 if (status & MISCSTATUS_DCD_LATCHED) {
2455                         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2456                                 info->ie1_value &= ~CDCD;
2457                                 write_reg(info, IE1, info->ie1_value);
2458                         }
2459                         icount->dcd++;
2460                         if (status & SerialSignal_DCD) {
2461                                 info->input_signal_events.dcd_up++;
2462                         } else
2463                                 info->input_signal_events.dcd_down++;
2464 #if SYNCLINK_GENERIC_HDLC
2465                         if (info->netcount) {
2466                                 if (status & SerialSignal_DCD)
2467                                         netif_carrier_on(info->netdev);
2468                                 else
2469                                         netif_carrier_off(info->netdev);
2470                         }
2471 #endif
2472                 }
2473                 if (status & MISCSTATUS_CTS_LATCHED)
2474                 {
2475                         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2476                                 info->ie1_value &= ~CCTS;
2477                                 write_reg(info, IE1, info->ie1_value);
2478                         }
2479                         icount->cts++;
2480                         if ( status & SerialSignal_CTS )
2481                                 info->input_signal_events.cts_up++;
2482                         else
2483                                 info->input_signal_events.cts_down++;
2484                 }
2485                 wake_up_interruptible(&info->status_event_wait_q);
2486                 wake_up_interruptible(&info->event_wait_q);
2487
2488                 if ( (info->port.flags & ASYNC_CHECK_CD) &&
2489                      (status & MISCSTATUS_DCD_LATCHED) ) {
2490                         if ( debug_level >= DEBUG_LEVEL_ISR )
2491                                 printk("%s CD now %s...", info->device_name,
2492                                        (status & SerialSignal_DCD) ? "on" : "off");
2493                         if (status & SerialSignal_DCD)
2494                                 wake_up_interruptible(&info->port.open_wait);
2495                         else {
2496                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2497                                         printk("doing serial hangup...");
2498                                 if (info->port.tty)
2499                                         tty_hangup(info->port.tty);
2500                         }
2501                 }
2502
2503                 if (tty_port_cts_enabled(&info->port) &&
2504                      (status & MISCSTATUS_CTS_LATCHED) ) {
2505                         if ( info->port.tty ) {
2506                                 if (info->port.tty->hw_stopped) {
2507                                         if (status & SerialSignal_CTS) {
2508                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2509                                                         printk("CTS tx start...");
2510                                                 info->port.tty->hw_stopped = 0;
2511                                                 tx_start(info);
2512                                                 info->pending_bh |= BH_TRANSMIT;
2513                                                 return;
2514                                         }
2515                                 } else {
2516                                         if (!(status & SerialSignal_CTS)) {
2517                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2518                                                         printk("CTS tx stop...");
2519                                                 info->port.tty->hw_stopped = 1;
2520                                                 tx_stop(info);
2521                                         }
2522                                 }
2523                         }
2524                 }
2525         }
2526
2527         info->pending_bh |= BH_STATUS;
2528 }
2529
2530 /* Interrupt service routine entry point.
2531  *
2532  * Arguments:
2533  *      irq             interrupt number that caused interrupt
2534  *      dev_id          device ID supplied during interrupt registration
2535  *      regs            interrupted processor context
2536  */
2537 static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
2538 {
2539         SLMP_INFO *info = dev_id;
2540         unsigned char status, status0, status1=0;
2541         unsigned char dmastatus, dmastatus0, dmastatus1=0;
2542         unsigned char timerstatus0, timerstatus1=0;
2543         unsigned char shift;
2544         unsigned int i;
2545         unsigned short tmp;
2546
2547         if ( debug_level >= DEBUG_LEVEL_ISR )
2548                 printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
2549                         __FILE__, __LINE__, info->irq_level);
2550
2551         spin_lock(&info->lock);
2552
2553         for(;;) {
2554
2555                 /* get status for SCA0 (ports 0-1) */
2556                 tmp = read_reg16(info, ISR0);   /* get ISR0 and ISR1 in one read */
2557                 status0 = (unsigned char)tmp;
2558                 dmastatus0 = (unsigned char)(tmp>>8);
2559                 timerstatus0 = read_reg(info, ISR2);
2560
2561                 if ( debug_level >= DEBUG_LEVEL_ISR )
2562                         printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2563                                 __FILE__, __LINE__, info->device_name,
2564                                 status0, dmastatus0, timerstatus0);
2565
2566                 if (info->port_count == 4) {
2567                         /* get status for SCA1 (ports 2-3) */
2568                         tmp = read_reg16(info->port_array[2], ISR0);
2569                         status1 = (unsigned char)tmp;
2570                         dmastatus1 = (unsigned char)(tmp>>8);
2571                         timerstatus1 = read_reg(info->port_array[2], ISR2);
2572
2573                         if ( debug_level >= DEBUG_LEVEL_ISR )
2574                                 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2575                                         __FILE__,__LINE__,info->device_name,
2576                                         status1,dmastatus1,timerstatus1);
2577                 }
2578
2579                 if (!status0 && !dmastatus0 && !timerstatus0 &&
2580                          !status1 && !dmastatus1 && !timerstatus1)
2581                         break;
2582
2583                 for(i=0; i < info->port_count ; i++) {
2584                         if (info->port_array[i] == NULL)
2585                                 continue;
2586                         if (i < 2) {
2587                                 status = status0;
2588                                 dmastatus = dmastatus0;
2589                         } else {
2590                                 status = status1;
2591                                 dmastatus = dmastatus1;
2592                         }
2593
2594                         shift = i & 1 ? 4 :0;
2595
2596                         if (status & BIT0 << shift)
2597                                 isr_rxrdy(info->port_array[i]);
2598                         if (status & BIT1 << shift)
2599                                 isr_txrdy(info->port_array[i]);
2600                         if (status & BIT2 << shift)
2601                                 isr_rxint(info->port_array[i]);
2602                         if (status & BIT3 << shift)
2603                                 isr_txint(info->port_array[i]);
2604
2605                         if (dmastatus & BIT0 << shift)
2606                                 isr_rxdmaerror(info->port_array[i]);
2607                         if (dmastatus & BIT1 << shift)
2608                                 isr_rxdmaok(info->port_array[i]);
2609                         if (dmastatus & BIT2 << shift)
2610                                 isr_txdmaerror(info->port_array[i]);
2611                         if (dmastatus & BIT3 << shift)
2612                                 isr_txdmaok(info->port_array[i]);
2613                 }
2614
2615                 if (timerstatus0 & (BIT5 | BIT4))
2616                         isr_timer(info->port_array[0]);
2617                 if (timerstatus0 & (BIT7 | BIT6))
2618                         isr_timer(info->port_array[1]);
2619                 if (timerstatus1 & (BIT5 | BIT4))
2620                         isr_timer(info->port_array[2]);
2621                 if (timerstatus1 & (BIT7 | BIT6))
2622                         isr_timer(info->port_array[3]);
2623         }
2624
2625         for(i=0; i < info->port_count ; i++) {
2626                 SLMP_INFO * port = info->port_array[i];
2627
2628                 /* Request bottom half processing if there's something
2629                  * for it to do and the bh is not already running.
2630                  *
2631                  * Note: startup adapter diags require interrupts.
2632                  * do not request bottom half processing if the
2633                  * device is not open in a normal mode.
2634                  */
2635                 if ( port && (port->port.count || port->netcount) &&
2636                      port->pending_bh && !port->bh_running &&
2637                      !port->bh_requested ) {
2638                         if ( debug_level >= DEBUG_LEVEL_ISR )
2639                                 printk("%s(%d):%s queueing bh task.\n",
2640                                         __FILE__,__LINE__,port->device_name);
2641                         schedule_work(&port->task);
2642                         port->bh_requested = true;
2643                 }
2644         }
2645
2646         spin_unlock(&info->lock);
2647
2648         if ( debug_level >= DEBUG_LEVEL_ISR )
2649                 printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
2650                         __FILE__, __LINE__, info->irq_level);
2651         return IRQ_HANDLED;
2652 }
2653
2654 /* Initialize and start device.
2655  */
2656 static int startup(SLMP_INFO * info)
2657 {
2658         if ( debug_level >= DEBUG_LEVEL_INFO )
2659                 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2660
2661         if (info->port.flags & ASYNC_INITIALIZED)
2662                 return 0;
2663
2664         if (!info->tx_buf) {
2665                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2666                 if (!info->tx_buf) {
2667                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2668                                 __FILE__,__LINE__,info->device_name);
2669                         return -ENOMEM;
2670                 }
2671         }
2672
2673         info->pending_bh = 0;
2674
2675         memset(&info->icount, 0, sizeof(info->icount));
2676
2677         /* program hardware for current parameters */
2678         reset_port(info);
2679
2680         change_params(info);
2681
2682         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
2683
2684         if (info->port.tty)
2685                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2686
2687         info->port.flags |= ASYNC_INITIALIZED;
2688
2689         return 0;
2690 }
2691
2692 /* Called by close() and hangup() to shutdown hardware
2693  */
2694 static void shutdown(SLMP_INFO * info)
2695 {
2696         unsigned long flags;
2697
2698         if (!(info->port.flags & ASYNC_INITIALIZED))
2699                 return;
2700
2701         if (debug_level >= DEBUG_LEVEL_INFO)
2702                 printk("%s(%d):%s synclinkmp_shutdown()\n",
2703                          __FILE__,__LINE__, info->device_name );
2704
2705         /* clear status wait queue because status changes */
2706         /* can't happen after shutting down the hardware */
2707         wake_up_interruptible(&info->status_event_wait_q);
2708         wake_up_interruptible(&info->event_wait_q);
2709
2710         del_timer(&info->tx_timer);
2711         del_timer(&info->status_timer);
2712
2713         kfree(info->tx_buf);
2714         info->tx_buf = NULL;
2715
2716         spin_lock_irqsave(&info->lock,flags);
2717
2718         reset_port(info);
2719
2720         if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2721                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2722                 set_signals(info);
2723         }
2724
2725         spin_unlock_irqrestore(&info->lock,flags);
2726
2727         if (info->port.tty)
2728                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2729
2730         info->port.flags &= ~ASYNC_INITIALIZED;
2731 }
2732
2733 static void program_hw(SLMP_INFO *info)
2734 {
2735         unsigned long flags;
2736
2737         spin_lock_irqsave(&info->lock,flags);
2738
2739         rx_stop(info);
2740         tx_stop(info);
2741
2742         info->tx_count = info->tx_put = info->tx_get = 0;
2743
2744         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2745                 hdlc_mode(info);
2746         else
2747                 async_mode(info);
2748
2749         set_signals(info);
2750
2751         info->dcd_chkcount = 0;
2752         info->cts_chkcount = 0;
2753         info->ri_chkcount = 0;
2754         info->dsr_chkcount = 0;
2755
2756         info->ie1_value |= (CDCD|CCTS);
2757         write_reg(info, IE1, info->ie1_value);
2758
2759         get_signals(info);
2760
2761         if (info->netcount || (info->port.tty && info->port.tty->termios.c_cflag & CREAD) )
2762                 rx_start(info);
2763
2764         spin_unlock_irqrestore(&info->lock,flags);
2765 }
2766
2767 /* Reconfigure adapter based on new parameters
2768  */
2769 static void change_params(SLMP_INFO *info)
2770 {
2771         unsigned cflag;
2772         int bits_per_char;
2773
2774         if (!info->port.tty)
2775                 return;
2776
2777         if (debug_level >= DEBUG_LEVEL_INFO)
2778                 printk("%s(%d):%s change_params()\n",
2779                          __FILE__,__LINE__, info->device_name );
2780
2781         cflag = info->port.tty->termios.c_cflag;
2782
2783         /* if B0 rate (hangup) specified then negate DTR and RTS */
2784         /* otherwise assert DTR and RTS */
2785         if (cflag & CBAUD)
2786                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2787         else
2788                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2789
2790         /* byte size and parity */
2791
2792         switch (cflag & CSIZE) {
2793               case CS5: info->params.data_bits = 5; break;
2794               case CS6: info->params.data_bits = 6; break;
2795               case CS7: info->params.data_bits = 7; break;
2796               case CS8: info->params.data_bits = 8; break;
2797               /* Never happens, but GCC is too dumb to figure it out */
2798               default:  info->params.data_bits = 7; break;
2799               }
2800
2801         if (cflag & CSTOPB)
2802                 info->params.stop_bits = 2;
2803         else
2804                 info->params.stop_bits = 1;
2805
2806         info->params.parity = ASYNC_PARITY_NONE;
2807         if (cflag & PARENB) {
2808                 if (cflag & PARODD)
2809                         info->params.parity = ASYNC_PARITY_ODD;
2810                 else
2811                         info->params.parity = ASYNC_PARITY_EVEN;
2812 #ifdef CMSPAR
2813                 if (cflag & CMSPAR)
2814                         info->params.parity = ASYNC_PARITY_SPACE;
2815 #endif
2816         }
2817
2818         /* calculate number of jiffies to transmit a full
2819          * FIFO (32 bytes) at specified data rate
2820          */
2821         bits_per_char = info->params.data_bits +
2822                         info->params.stop_bits + 1;
2823
2824         /* if port data rate is set to 460800 or less then
2825          * allow tty settings to override, otherwise keep the
2826          * current data rate.
2827          */
2828         if (info->params.data_rate <= 460800) {
2829                 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2830         }
2831
2832         if ( info->params.data_rate ) {
2833                 info->timeout = (32*HZ*bits_per_char) /
2834                                 info->params.data_rate;
2835         }
2836         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2837
2838         if (cflag & CRTSCTS)
2839                 info->port.flags |= ASYNC_CTS_FLOW;
2840         else
2841                 info->port.flags &= ~ASYNC_CTS_FLOW;
2842
2843         if (cflag & CLOCAL)
2844                 info->port.flags &= ~ASYNC_CHECK_CD;
2845         else
2846                 info->port.flags |= ASYNC_CHECK_CD;
2847
2848         /* process tty input control flags */
2849
2850         info->read_status_mask2 = OVRN;
2851         if (I_INPCK(info->port.tty))
2852                 info->read_status_mask2 |= PE | FRME;
2853         if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2854                 info->read_status_mask1 |= BRKD;
2855         if (I_IGNPAR(info->port.tty))
2856                 info->ignore_status_mask2 |= PE | FRME;
2857         if (I_IGNBRK(info->port.tty)) {
2858                 info->ignore_status_mask1 |= BRKD;
2859                 /* If ignoring parity and break indicators, ignore
2860                  * overruns too.  (For real raw support).
2861                  */
2862                 if (I_IGNPAR(info->port.tty))
2863                         info->ignore_status_mask2 |= OVRN;
2864         }
2865
2866         program_hw(info);
2867 }
2868
2869 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2870 {
2871         int err;
2872
2873         if (debug_level >= DEBUG_LEVEL_INFO)
2874                 printk("%s(%d):%s get_params()\n",
2875                          __FILE__,__LINE__, info->device_name);
2876
2877         if (!user_icount) {
2878                 memset(&info->icount, 0, sizeof(info->icount));
2879         } else {
2880                 mutex_lock(&info->port.mutex);
2881                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2882                 mutex_unlock(&info->port.mutex);
2883                 if (err)
2884                         return -EFAULT;
2885         }
2886
2887         return 0;
2888 }
2889
2890 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2891 {
2892         int err;
2893         if (debug_level >= DEBUG_LEVEL_INFO)
2894                 printk("%s(%d):%s get_params()\n",
2895                          __FILE__,__LINE__, info->device_name);
2896
2897         mutex_lock(&info->port.mutex);
2898         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2899         mutex_unlock(&info->port.mutex);
2900         if (err) {
2901                 if ( debug_level >= DEBUG_LEVEL_INFO )
2902                         printk( "%s(%d):%s get_params() user buffer copy failed\n",
2903                                 __FILE__,__LINE__,info->device_name);
2904                 return -EFAULT;
2905         }
2906
2907         return 0;
2908 }
2909
2910 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2911 {
2912         unsigned long flags;
2913         MGSL_PARAMS tmp_params;
2914         int err;
2915
2916         if (debug_level >= DEBUG_LEVEL_INFO)
2917                 printk("%s(%d):%s set_params\n",
2918                         __FILE__,__LINE__,info->device_name );
2919         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2920         if (err) {
2921                 if ( debug_level >= DEBUG_LEVEL_INFO )
2922                         printk( "%s(%d):%s set_params() user buffer copy failed\n",
2923                                 __FILE__,__LINE__,info->device_name);
2924                 return -EFAULT;
2925         }
2926
2927         mutex_lock(&info->port.mutex);
2928         spin_lock_irqsave(&info->lock,flags);
2929         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2930         spin_unlock_irqrestore(&info->lock,flags);
2931
2932         change_params(info);
2933         mutex_unlock(&info->port.mutex);
2934
2935         return 0;
2936 }
2937
2938 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
2939 {
2940         int err;
2941
2942         if (debug_level >= DEBUG_LEVEL_INFO)
2943                 printk("%s(%d):%s get_txidle()=%d\n",
2944                          __FILE__,__LINE__, info->device_name, info->idle_mode);
2945
2946         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2947         if (err) {
2948                 if ( debug_level >= DEBUG_LEVEL_INFO )
2949                         printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
2950                                 __FILE__,__LINE__,info->device_name);
2951                 return -EFAULT;
2952         }
2953
2954         return 0;
2955 }
2956
2957 static int set_txidle(SLMP_INFO * info, int idle_mode)
2958 {
2959         unsigned long flags;
2960
2961         if (debug_level >= DEBUG_LEVEL_INFO)
2962                 printk("%s(%d):%s set_txidle(%d)\n",
2963                         __FILE__,__LINE__,info->device_name, idle_mode );
2964
2965         spin_lock_irqsave(&info->lock,flags);
2966         info->idle_mode = idle_mode;
2967         tx_set_idle( info );
2968         spin_unlock_irqrestore(&info->lock,flags);
2969         return 0;
2970 }
2971
2972 static int tx_enable(SLMP_INFO * info, int enable)
2973 {
2974         unsigned long flags;
2975
2976         if (debug_level >= DEBUG_LEVEL_INFO)
2977                 printk("%s(%d):%s tx_enable(%d)\n",
2978                         __FILE__,__LINE__,info->device_name, enable);
2979
2980         spin_lock_irqsave(&info->lock,flags);
2981         if ( enable ) {
2982                 if ( !info->tx_enabled ) {
2983                         tx_start(info);
2984                 }
2985         } else {
2986                 if ( info->tx_enabled )
2987                         tx_stop(info);
2988         }
2989         spin_unlock_irqrestore(&info->lock,flags);
2990         return 0;
2991 }
2992
2993 /* abort send HDLC frame
2994  */
2995 static int tx_abort(SLMP_INFO * info)
2996 {
2997         unsigned long flags;
2998
2999         if (debug_level >= DEBUG_LEVEL_INFO)
3000                 printk("%s(%d):%s tx_abort()\n",
3001                         __FILE__,__LINE__,info->device_name);
3002
3003         spin_lock_irqsave(&info->lock,flags);
3004         if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
3005                 info->ie1_value &= ~UDRN;
3006                 info->ie1_value |= IDLE;
3007                 write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
3008                 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
3009
3010                 write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
3011                 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
3012
3013                 write_reg(info, CMD, TXABORT);
3014         }
3015         spin_unlock_irqrestore(&info->lock,flags);
3016         return 0;
3017 }
3018
3019 static int rx_enable(SLMP_INFO * info, int enable)
3020 {
3021         unsigned long flags;
3022
3023         if (debug_level >= DEBUG_LEVEL_INFO)
3024                 printk("%s(%d):%s rx_enable(%d)\n",
3025                         __FILE__,__LINE__,info->device_name,enable);
3026
3027         spin_lock_irqsave(&info->lock,flags);
3028         if ( enable ) {
3029                 if ( !info->rx_enabled )
3030                         rx_start(info);
3031         } else {
3032                 if ( info->rx_enabled )
3033                         rx_stop(info);
3034         }
3035         spin_unlock_irqrestore(&info->lock,flags);
3036         return 0;
3037 }
3038
3039 /* wait for specified event to occur
3040  */
3041 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3042 {
3043         unsigned long flags;
3044         int s;
3045         int rc=0;
3046         struct mgsl_icount cprev, cnow;
3047         int events;
3048         int mask;
3049         struct  _input_signal_events oldsigs, newsigs;
3050         DECLARE_WAITQUEUE(wait, current);
3051
3052         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3053         if (rc) {
3054                 return  -EFAULT;
3055         }
3056
3057         if (debug_level >= DEBUG_LEVEL_INFO)
3058                 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3059                         __FILE__,__LINE__,info->device_name,mask);
3060
3061         spin_lock_irqsave(&info->lock,flags);
3062
3063         /* return immediately if state matches requested events */
3064         get_signals(info);
3065         s = info->serial_signals;
3066
3067         events = mask &
3068                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3069                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3070                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3071                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3072         if (events) {
3073                 spin_unlock_irqrestore(&info->lock,flags);
3074                 goto exit;
3075         }
3076
3077         /* save current irq counts */
3078         cprev = info->icount;
3079         oldsigs = info->input_signal_events;
3080
3081         /* enable hunt and idle irqs if needed */
3082         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3083                 unsigned char oldval = info->ie1_value;
3084                 unsigned char newval = oldval +
3085                          (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3086                          (mask & MgslEvent_IdleReceived ? IDLD:0);
3087                 if ( oldval != newval ) {
3088                         info->ie1_value = newval;
3089                         write_reg(info, IE1, info->ie1_value);
3090                 }
3091         }
3092
3093         set_current_state(TASK_INTERRUPTIBLE);
3094         add_wait_queue(&info->event_wait_q, &wait);
3095
3096         spin_unlock_irqrestore(&info->lock,flags);
3097
3098         for(;;) {
3099                 schedule();
3100                 if (signal_pending(current)) {
3101                         rc = -ERESTARTSYS;
3102                         break;
3103                 }
3104
3105                 /* get current irq counts */
3106                 spin_lock_irqsave(&info->lock,flags);
3107                 cnow = info->icount;
3108                 newsigs = info->input_signal_events;
3109                 set_current_state(TASK_INTERRUPTIBLE);
3110                 spin_unlock_irqrestore(&info->lock,flags);
3111
3112                 /* if no change, wait aborted for some reason */
3113                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
3114                     newsigs.dsr_down == oldsigs.dsr_down &&
3115                     newsigs.dcd_up   == oldsigs.dcd_up   &&
3116                     newsigs.dcd_down == oldsigs.dcd_down &&
3117                     newsigs.cts_up   == oldsigs.cts_up   &&
3118                     newsigs.cts_down == oldsigs.cts_down &&
3119                     newsigs.ri_up    == oldsigs.ri_up    &&
3120                     newsigs.ri_down  == oldsigs.ri_down  &&
3121                     cnow.exithunt    == cprev.exithunt   &&
3122                     cnow.rxidle      == cprev.rxidle) {
3123                         rc = -EIO;
3124                         break;
3125                 }
3126
3127                 events = mask &
3128                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
3129                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3130                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
3131                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3132                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
3133                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3134                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
3135                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
3136                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
3137                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
3138                 if (events)
3139                         break;
3140
3141                 cprev = cnow;
3142                 oldsigs = newsigs;
3143         }
3144
3145         remove_wait_queue(&info->event_wait_q, &wait);
3146         set_current_state(TASK_RUNNING);
3147
3148
3149         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3150                 spin_lock_irqsave(&info->lock,flags);
3151                 if (!waitqueue_active(&info->event_wait_q)) {
3152                         /* disable enable exit hunt mode/idle rcvd IRQs */
3153                         info->ie1_value &= ~(FLGD|IDLD);
3154                         write_reg(info, IE1, info->ie1_value);
3155                 }
3156                 spin_unlock_irqrestore(&info->lock,flags);
3157         }
3158 exit:
3159         if ( rc == 0 )
3160                 PUT_USER(rc, events, mask_ptr);
3161
3162         return rc;
3163 }
3164
3165 static int modem_input_wait(SLMP_INFO *info,int arg)
3166 {
3167         unsigned long flags;
3168         int rc;
3169         struct mgsl_icount cprev, cnow;
3170         DECLARE_WAITQUEUE(wait, current);
3171
3172         /* save current irq counts */
3173         spin_lock_irqsave(&info->lock,flags);
3174         cprev = info->icount;
3175         add_wait_queue(&info->status_event_wait_q, &wait);
3176         set_current_state(TASK_INTERRUPTIBLE);
3177         spin_unlock_irqrestore(&info->lock,flags);
3178
3179         for(;;) {
3180                 schedule();
3181                 if (signal_pending(current)) {
3182                         rc = -ERESTARTSYS;
3183                         break;
3184                 }
3185
3186                 /* get new irq counts */
3187                 spin_lock_irqsave(&info->lock,flags);
3188                 cnow = info->icount;
3189                 set_current_state(TASK_INTERRUPTIBLE);
3190                 spin_unlock_irqrestore(&info->lock,flags);
3191
3192                 /* if no change, wait aborted for some reason */
3193                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3194                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3195                         rc = -EIO;
3196                         break;
3197                 }
3198
3199                 /* check for change in caller specified modem input */
3200                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3201                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3202                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3203                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3204                         rc = 0;
3205                         break;
3206                 }
3207
3208                 cprev = cnow;
3209         }
3210         remove_wait_queue(&info->status_event_wait_q, &wait);
3211         set_current_state(TASK_RUNNING);
3212         return rc;
3213 }
3214
3215 /* return the state of the serial control and status signals
3216  */
3217 static int tiocmget(struct tty_struct *tty)
3218 {
3219         SLMP_INFO *info = tty->driver_data;
3220         unsigned int result;
3221         unsigned long flags;
3222
3223         spin_lock_irqsave(&info->lock,flags);
3224         get_signals(info);
3225         spin_unlock_irqrestore(&info->lock,flags);
3226
3227         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3228                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3229                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3230                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
3231                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3232                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3233
3234         if (debug_level >= DEBUG_LEVEL_INFO)
3235                 printk("%s(%d):%s tiocmget() value=%08X\n",
3236                          __FILE__,__LINE__, info->device_name, result );
3237         return result;
3238 }
3239
3240 /* set modem control signals (DTR/RTS)
3241  */
3242 static int tiocmset(struct tty_struct *tty,
3243                                         unsigned int set, unsigned int clear)
3244 {
3245         SLMP_INFO *info = tty->driver_data;
3246         unsigned long flags;
3247
3248         if (debug_level >= DEBUG_LEVEL_INFO)
3249                 printk("%s(%d):%s tiocmset(%x,%x)\n",
3250                         __FILE__,__LINE__,info->device_name, set, clear);
3251
3252         if (set & TIOCM_RTS)
3253                 info->serial_signals |= SerialSignal_RTS;
3254         if (set & TIOCM_DTR)
3255                 info->serial_signals |= SerialSignal_DTR;
3256         if (clear & TIOCM_RTS)
3257                 info->serial_signals &= ~SerialSignal_RTS;
3258         if (clear & TIOCM_DTR)
3259                 info->serial_signals &= ~SerialSignal_DTR;
3260
3261         spin_lock_irqsave(&info->lock,flags);
3262         set_signals(info);
3263         spin_unlock_irqrestore(&info->lock,flags);
3264
3265         return 0;
3266 }
3267
3268 static int carrier_raised(struct tty_port *port)
3269 {
3270         SLMP_INFO *info = container_of(port, SLMP_INFO, port);
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         return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
3278 }
3279
3280 static void dtr_rts(struct tty_port *port, int on)
3281 {
3282         SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3283         unsigned long flags;
3284
3285         spin_lock_irqsave(&info->lock,flags);
3286         if (on)
3287                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3288         else
3289                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3290         set_signals(info);
3291         spin_unlock_irqrestore(&info->lock,flags);
3292 }
3293
3294 /* Block the current process until the specified port is ready to open.
3295  */
3296 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3297                            SLMP_INFO *info)
3298 {
3299         DECLARE_WAITQUEUE(wait, current);
3300         int             retval;
3301         bool            do_clocal = false;
3302         bool            extra_count = false;
3303         unsigned long   flags;
3304         int             cd;
3305         struct tty_port *port = &info->port;
3306
3307         if (debug_level >= DEBUG_LEVEL_INFO)
3308                 printk("%s(%d):%s block_til_ready()\n",
3309                          __FILE__,__LINE__, tty->driver->name );
3310
3311         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3312                 /* nonblock mode is set or port is not enabled */
3313                 /* just verify that callout device is not active */
3314                 port->flags |= ASYNC_NORMAL_ACTIVE;
3315                 return 0;
3316         }
3317
3318         if (tty->termios.c_cflag & CLOCAL)
3319                 do_clocal = true;
3320
3321         /* Wait for carrier detect and the line to become
3322          * free (i.e., not in use by the callout).  While we are in
3323          * this loop, port->count is dropped by one, so that
3324          * close() knows when to free things.  We restore it upon
3325          * exit, either normal or abnormal.
3326          */
3327
3328         retval = 0;
3329         add_wait_queue(&port->open_wait, &wait);
3330
3331         if (debug_level >= DEBUG_LEVEL_INFO)
3332                 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3333                          __FILE__,__LINE__, tty->driver->name, port->count );
3334
3335         spin_lock_irqsave(&info->lock, flags);
3336         if (!tty_hung_up_p(filp)) {
3337                 extra_count = true;
3338                 port->count--;
3339         }
3340         spin_unlock_irqrestore(&info->lock, flags);
3341         port->blocked_open++;
3342
3343         while (1) {
3344                 if (tty->termios.c_cflag & CBAUD)
3345                         tty_port_raise_dtr_rts(port);
3346
3347                 set_current_state(TASK_INTERRUPTIBLE);
3348
3349                 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3350                         retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3351                                         -EAGAIN : -ERESTARTSYS;
3352                         break;
3353                 }
3354
3355                 cd = tty_port_carrier_raised(port);
3356
3357                 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd))
3358                         break;
3359
3360                 if (signal_pending(current)) {
3361                         retval = -ERESTARTSYS;
3362                         break;
3363                 }
3364
3365                 if (debug_level >= DEBUG_LEVEL_INFO)
3366                         printk("%s(%d):%s block_til_ready() count=%d\n",
3367                                  __FILE__,__LINE__, tty->driver->name, port->count );
3368
3369                 tty_unlock(tty);
3370                 schedule();
3371                 tty_lock(tty);
3372         }
3373
3374         set_current_state(TASK_RUNNING);
3375         remove_wait_queue(&port->open_wait, &wait);
3376
3377         if (extra_count)
3378                 port->count++;
3379         port->blocked_open--;
3380
3381         if (debug_level >= DEBUG_LEVEL_INFO)
3382                 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3383                          __FILE__,__LINE__, tty->driver->name, port->count );
3384
3385         if (!retval)
3386                 port->flags |= ASYNC_NORMAL_ACTIVE;
3387
3388         return retval;
3389 }
3390
3391 static int alloc_dma_bufs(SLMP_INFO *info)
3392 {
3393         unsigned short BuffersPerFrame;
3394         unsigned short BufferCount;
3395
3396         // Force allocation to start at 64K boundary for each port.
3397         // This is necessary because *all* buffer descriptors for a port
3398         // *must* be in the same 64K block. All descriptors on a port
3399         // share a common 'base' address (upper 8 bits of 24 bits) programmed
3400         // into the CBP register.
3401         info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3402
3403         /* Calculate the number of DMA buffers necessary to hold the */
3404         /* largest allowable frame size. Note: If the max frame size is */
3405         /* not an even multiple of the DMA buffer size then we need to */
3406         /* round the buffer count per frame up one. */
3407
3408         BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3409         if ( info->max_frame_size % SCABUFSIZE )
3410                 BuffersPerFrame++;
3411
3412         /* calculate total number of data buffers (SCABUFSIZE) possible
3413          * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3414          * for the descriptor list (BUFFERLISTSIZE).
3415          */
3416         BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3417
3418         /* limit number of buffers to maximum amount of descriptors */
3419         if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3420                 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3421
3422         /* use enough buffers to transmit one max size frame */
3423         info->tx_buf_count = BuffersPerFrame + 1;
3424
3425         /* never use more than half the available buffers for transmit */
3426         if (info->tx_buf_count > (BufferCount/2))
3427                 info->tx_buf_count = BufferCount/2;
3428
3429         if (info->tx_buf_count > SCAMAXDESC)
3430                 info->tx_buf_count = SCAMAXDESC;
3431
3432         /* use remaining buffers for receive */
3433         info->rx_buf_count = BufferCount - info->tx_buf_count;
3434
3435         if (info->rx_buf_count > SCAMAXDESC)
3436                 info->rx_buf_count = SCAMAXDESC;
3437
3438         if ( debug_level >= DEBUG_LEVEL_INFO )
3439                 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3440                         __FILE__,__LINE__, info->device_name,
3441                         info->tx_buf_count,info->rx_buf_count);
3442
3443         if ( alloc_buf_list( info ) < 0 ||
3444                 alloc_frame_bufs(info,
3445                                         info->rx_buf_list,
3446                                         info->rx_buf_list_ex,
3447                                         info->rx_buf_count) < 0 ||
3448                 alloc_frame_bufs(info,
3449                                         info->tx_buf_list,
3450                                         info->tx_buf_list_ex,
3451                                         info->tx_buf_count) < 0 ||
3452                 alloc_tmp_rx_buf(info) < 0 ) {
3453                 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3454                         __FILE__,__LINE__, info->device_name);
3455                 return -ENOMEM;
3456         }
3457
3458         rx_reset_buffers( info );
3459
3460         return 0;
3461 }
3462
3463 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3464  */
3465 static int alloc_buf_list(SLMP_INFO *info)
3466 {
3467         unsigned int i;
3468
3469         /* build list in adapter shared memory */
3470         info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3471         info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3472         info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3473
3474         memset(info->buffer_list, 0, BUFFERLISTSIZE);
3475
3476         /* Save virtual address pointers to the receive and */
3477         /* transmit buffer lists. (Receive 1st). These pointers will */
3478         /* be used by the processor to access the lists. */
3479         info->rx_buf_list = (SCADESC *)info->buffer_list;
3480
3481         info->tx_buf_list = (SCADESC *)info->buffer_list;
3482         info->tx_buf_list += info->rx_buf_count;
3483
3484         /* Build links for circular buffer entry lists (tx and rx)
3485          *
3486          * Note: links are physical addresses read by the SCA device
3487          * to determine the next buffer entry to use.
3488          */
3489
3490         for ( i = 0; i < info->rx_buf_count; i++ ) {
3491                 /* calculate and store physical address of this buffer entry */
3492                 info->rx_buf_list_ex[i].phys_entry =
3493                         info->buffer_list_phys + (i * sizeof(SCABUFSIZE));
3494
3495                 /* calculate and store physical address of */
3496                 /* next entry in cirular list of entries */
3497                 info->rx_buf_list[i].next = info->buffer_list_phys;
3498                 if ( i < info->rx_buf_count - 1 )
3499                         info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3500
3501                 info->rx_buf_list[i].length = SCABUFSIZE;
3502         }
3503
3504         for ( i = 0; i < info->tx_buf_count; i++ ) {
3505                 /* calculate and store physical address of this buffer entry */
3506                 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3507                         ((info->rx_buf_count + i) * sizeof(SCADESC));
3508
3509                 /* calculate and store physical address of */
3510                 /* next entry in cirular list of entries */
3511
3512                 info->tx_buf_list[i].next = info->buffer_list_phys +
3513                         info->rx_buf_count * sizeof(SCADESC);
3514
3515                 if ( i < info->tx_buf_count - 1 )
3516                         info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3517         }
3518
3519         return 0;
3520 }
3521
3522 /* Allocate the frame DMA buffers used by the specified buffer list.
3523  */
3524 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3525 {
3526         int i;
3527         unsigned long phys_addr;
3528
3529         for ( i = 0; i < count; i++ ) {
3530                 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3531                 phys_addr = info->port_array[0]->last_mem_alloc;
3532                 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3533
3534                 buf_list[i].buf_ptr  = (unsigned short)phys_addr;
3535                 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3536         }
3537
3538         return 0;
3539 }
3540
3541 static void free_dma_bufs(SLMP_INFO *info)
3542 {
3543         info->buffer_list = NULL;
3544         info->rx_buf_list = NULL;
3545         info->tx_buf_list = NULL;
3546 }
3547
3548 /* allocate buffer large enough to hold max_frame_size.
3549  * This buffer is used to pass an assembled frame to the line discipline.
3550  */
3551 static int alloc_tmp_rx_buf(SLMP_INFO *info)
3552 {
3553         info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3554         if (info->tmp_rx_buf == NULL)
3555                 return -ENOMEM;
3556         return 0;
3557 }
3558
3559 static void free_tmp_rx_buf(SLMP_INFO *info)
3560 {
3561         kfree(info->tmp_rx_buf);
3562         info->tmp_rx_buf = NULL;
3563 }
3564
3565 static int claim_resources(SLMP_INFO *info)
3566 {
3567         if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3568                 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3569                         __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3570                 info->init_error = DiagStatus_AddressConflict;
3571                 goto errout;
3572         }
3573         else
3574                 info->shared_mem_requested = true;
3575
3576         if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3577                 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3578                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3579                 info->init_error = DiagStatus_AddressConflict;
3580                 goto errout;
3581         }
3582         else
3583                 info->lcr_mem_requested = true;
3584
3585         if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3586                 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3587                         __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3588                 info->init_error = DiagStatus_AddressConflict;
3589                 goto errout;
3590         }
3591         else
3592                 info->sca_base_requested = true;
3593
3594         if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3595                 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3596                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3597                 info->init_error = DiagStatus_AddressConflict;
3598                 goto errout;
3599         }
3600         else
3601                 info->sca_statctrl_requested = true;
3602
3603         info->memory_base = ioremap_nocache(info->phys_memory_base,
3604                                                                 SCA_MEM_SIZE);
3605         if (!info->memory_base) {
3606                 printk( "%s(%d):%s Can't map shared memory, MemAddr=%08X\n",
3607                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3608                 info->init_error = DiagStatus_CantAssignPciResources;
3609                 goto errout;
3610         }
3611
3612         info->lcr_base = ioremap_nocache(info->phys_lcr_base, PAGE_SIZE);
3613         if (!info->lcr_base) {
3614                 printk( "%s(%d):%s Can't map LCR memory, MemAddr=%08X\n",
3615                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3616                 info->init_error = DiagStatus_CantAssignPciResources;
3617                 goto errout;
3618         }
3619         info->lcr_base += info->lcr_offset;
3620
3621         info->sca_base = ioremap_nocache(info->phys_sca_base, PAGE_SIZE);
3622         if (!info->sca_base) {
3623                 printk( "%s(%d):%s Can't map SCA memory, MemAddr=%08X\n",
3624                         __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3625                 info->init_error = DiagStatus_CantAssignPciResources;
3626                 goto errout;
3627         }
3628         info->sca_base += info->sca_offset;
3629
3630         info->statctrl_base = ioremap_nocache(info->phys_statctrl_base,
3631                                                                 PAGE_SIZE);
3632         if (!info->statctrl_base) {
3633                 printk( "%s(%d):%s Can't map SCA Status/Control memory, MemAddr=%08X\n",
3634                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3635                 info->init_error = DiagStatus_CantAssignPciResources;
3636                 goto errout;
3637         }
3638         info->statctrl_base += info->statctrl_offset;
3639
3640         if ( !memory_test(info) ) {
3641                 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3642                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3643                 info->init_error = DiagStatus_MemoryError;
3644                 goto errout;
3645         }
3646
3647         return 0;
3648
3649 errout:
3650         release_resources( info );
3651         return -ENODEV;
3652 }
3653
3654 static void release_resources(SLMP_INFO *info)
3655 {
3656         if ( debug_level >= DEBUG_LEVEL_INFO )
3657                 printk( "%s(%d):%s release_resources() entry\n",
3658                         __FILE__,__LINE__,info->device_name );
3659
3660         if ( info->irq_requested ) {
3661                 free_irq(info->irq_level, info);
3662                 info->irq_requested = false;
3663         }
3664
3665         if ( info->shared_mem_requested ) {
3666                 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3667                 info->shared_mem_requested = false;
3668         }
3669         if ( info->lcr_mem_requested ) {
3670                 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3671                 info->lcr_mem_requested = false;
3672         }
3673         if ( info->sca_base_requested ) {
3674                 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3675                 info->sca_base_requested = false;
3676         }
3677         if ( info->sca_statctrl_requested ) {
3678                 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3679                 info->sca_statctrl_requested = false;
3680         }
3681
3682         if (info->memory_base){
3683                 iounmap(info->memory_base);
3684                 info->memory_base = NULL;
3685         }
3686
3687         if (info->sca_base) {
3688                 iounmap(info->sca_base - info->sca_offset);
3689                 info->sca_base=NULL;
3690         }
3691
3692         if (info->statctrl_base) {
3693                 iounmap(info->statctrl_base - info->statctrl_offset);
3694                 info->statctrl_base=NULL;
3695         }
3696
3697         if (info->lcr_base){
3698                 iounmap(info->lcr_base - info->lcr_offset);
3699                 info->lcr_base = NULL;
3700         }
3701
3702         if ( debug_level >= DEBUG_LEVEL_INFO )
3703                 printk( "%s(%d):%s release_resources() exit\n",
3704                         __FILE__,__LINE__,info->device_name );
3705 }
3706
3707 /* Add the specified device instance data structure to the
3708  * global linked list of devices and increment the device count.
3709  */
3710 static void add_device(SLMP_INFO *info)
3711 {
3712         info->next_device = NULL;
3713         info->line = synclinkmp_device_count;
3714         sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3715
3716         if (info->line < MAX_DEVICES) {
3717                 if (maxframe[info->line])
3718                         info->max_frame_size = maxframe[info->line];
3719         }
3720
3721         synclinkmp_device_count++;
3722
3723         if ( !synclinkmp_device_list )
3724                 synclinkmp_device_list = info;
3725         else {
3726                 SLMP_INFO *current_dev = synclinkmp_device_list;
3727                 while( current_dev->next_device )
3728                         current_dev = current_dev->next_device;
3729                 current_dev->next_device = info;
3730         }
3731
3732         if ( info->max_frame_size < 4096 )
3733                 info->max_frame_size = 4096;
3734         else if ( info->max_frame_size > 65535 )
3735                 info->max_frame_size = 65535;
3736
3737         printk( "SyncLink MultiPort %s: "
3738                 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3739                 info->device_name,
3740                 info->phys_sca_base,
3741                 info->phys_memory_base,
3742                 info->phys_statctrl_base,
3743                 info->phys_lcr_base,
3744                 info->irq_level,
3745                 info->max_frame_size );
3746
3747 #if SYNCLINK_GENERIC_HDLC
3748         hdlcdev_init(info);
3749 #endif
3750 }
3751
3752 static const struct tty_port_operations port_ops = {
3753         .carrier_raised = carrier_raised,
3754         .dtr_rts = dtr_rts,
3755 };
3756
3757 /* Allocate and initialize a device instance structure
3758  *
3759  * Return Value:        pointer to SLMP_INFO if success, otherwise NULL
3760  */
3761 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3762 {
3763         SLMP_INFO *info;
3764
3765         info = kzalloc(sizeof(SLMP_INFO),
3766                  GFP_KERNEL);
3767
3768         if (!info) {
3769                 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3770                         __FILE__,__LINE__, adapter_num, port_num);
3771         } else {
3772                 tty_port_init(&info->port);
3773                 info->port.ops = &port_ops;
3774                 info->magic = MGSL_MAGIC;
3775                 INIT_WORK(&info->task, bh_handler);
3776                 info->max_frame_size = 4096;
3777                 info->port.close_delay = 5*HZ/10;
3778                 info->port.closing_wait = 30*HZ;
3779                 init_waitqueue_head(&info->status_event_wait_q);
3780                 init_waitqueue_head(&info->event_wait_q);
3781                 spin_lock_init(&info->netlock);
3782                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3783                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3784                 info->adapter_num = adapter_num;
3785                 info->port_num = port_num;
3786
3787                 /* Copy configuration info to device instance data */
3788                 info->irq_level = pdev->irq;
3789                 info->phys_lcr_base = pci_resource_start(pdev,0);
3790                 info->phys_sca_base = pci_resource_start(pdev,2);
3791                 info->phys_memory_base = pci_resource_start(pdev,3);
3792                 info->phys_statctrl_base = pci_resource_start(pdev,4);
3793
3794                 /* Because veremap only works on page boundaries we must map
3795                  * a larger area than is actually implemented for the LCR
3796                  * memory range. We map a full page starting at the page boundary.
3797                  */
3798                 info->lcr_offset    = info->phys_lcr_base & (PAGE_SIZE-1);
3799                 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3800
3801                 info->sca_offset    = info->phys_sca_base & (PAGE_SIZE-1);
3802                 info->phys_sca_base &= ~(PAGE_SIZE-1);
3803
3804                 info->statctrl_offset    = info->phys_statctrl_base & (PAGE_SIZE-1);
3805                 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3806
3807                 info->bus_type = MGSL_BUS_TYPE_PCI;
3808                 info->irq_flags = IRQF_SHARED;
3809
3810                 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3811                 setup_timer(&info->status_timer, status_timeout,
3812                                 (unsigned long)info);
3813
3814                 /* Store the PCI9050 misc control register value because a flaw
3815                  * in the PCI9050 prevents LCR registers from being read if
3816                  * BIOS assigns an LCR base address with bit 7 set.
3817                  *
3818                  * Only the misc control register is accessed for which only
3819                  * write access is needed, so set an initial value and change
3820                  * bits to the device instance data as we write the value
3821                  * to the actual misc control register.
3822                  */
3823                 info->misc_ctrl_value = 0x087e4546;
3824
3825                 /* initial port state is unknown - if startup errors
3826                  * occur, init_error will be set to indicate the
3827                  * problem. Once the port is fully initialized,
3828                  * this value will be set to 0 to indicate the
3829                  * port is available.
3830                  */
3831                 info->init_error = -1;
3832         }
3833
3834         return info;
3835 }
3836
3837 static void device_init(int adapter_num, struct pci_dev *pdev)
3838 {
3839         SLMP_INFO *port_array[SCA_MAX_PORTS];
3840         int port;
3841
3842         /* allocate device instances for up to SCA_MAX_PORTS devices */
3843         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3844                 port_array[port] = alloc_dev(adapter_num,port,pdev);
3845                 if( port_array[port] == NULL ) {
3846                         for (--port; port >= 0; --port) {
3847                                 tty_port_destroy(&port_array[port]->port);
3848                                 kfree(port_array[port]);
3849                         }
3850                         return;
3851                 }
3852         }
3853
3854         /* give copy of port_array to all ports and add to device list  */
3855         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3856                 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3857                 add_device( port_array[port] );
3858                 spin_lock_init(&port_array[port]->lock);
3859         }
3860
3861         /* Allocate and claim adapter resources */
3862         if ( !claim_resources(port_array[0]) ) {
3863
3864                 alloc_dma_bufs(port_array[0]);
3865
3866                 /* copy resource information from first port to others */
3867                 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3868                         port_array[port]->lock  = port_array[0]->lock;
3869                         port_array[port]->irq_level     = port_array[0]->irq_level;
3870                         port_array[port]->memory_base   = port_array[0]->memory_base;
3871                         port_array[port]->sca_base      = port_array[0]->sca_base;
3872                         port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3873                         port_array[port]->lcr_base      = port_array[0]->lcr_base;
3874                         alloc_dma_bufs(port_array[port]);
3875                 }
3876
3877                 if ( request_irq(port_array[0]->irq_level,
3878                                         synclinkmp_interrupt,
3879                                         port_array[0]->irq_flags,
3880                                         port_array[0]->device_name,
3881                                         port_array[0]) < 0 ) {
3882                         printk( "%s(%d):%s Can't request interrupt, IRQ=%d\n",
3883                                 __FILE__,__LINE__,
3884                                 port_array[0]->device_name,
3885                                 port_array[0]->irq_level );
3886                 }
3887                 else {
3888                         port_array[0]->irq_requested = true;
3889                         adapter_test(port_array[0]);
3890                 }
3891         }
3892 }
3893
3894 static const struct tty_operations ops = {
3895         .install = install,
3896         .open = open,
3897         .close = close,
3898         .write = write,
3899         .put_char = put_char,
3900         .flush_chars = flush_chars,
3901         .write_room = write_room,
3902         .chars_in_buffer = chars_in_buffer,
3903         .flush_buffer = flush_buffer,
3904         .ioctl = ioctl,
3905         .throttle = throttle,
3906         .unthrottle = unthrottle,
3907         .send_xchar = send_xchar,
3908         .break_ctl = set_break,
3909         .wait_until_sent = wait_until_sent,
3910         .set_termios = set_termios,
3911         .stop = tx_hold,
3912         .start = tx_release,
3913         .hangup = hangup,
3914         .tiocmget = tiocmget,
3915         .tiocmset = tiocmset,
3916         .get_icount = get_icount,
3917         .proc_fops = &synclinkmp_proc_fops,
3918 };
3919
3920
3921 static void synclinkmp_cleanup(void)
3922 {
3923         int rc;
3924         SLMP_INFO *info;
3925         SLMP_INFO *tmp;
3926
3927         printk("Unloading %s %s\n", driver_name, driver_version);
3928
3929         if (serial_driver) {
3930                 if ((rc = tty_unregister_driver(serial_driver)))
3931                         printk("%s(%d) failed to unregister tty driver err=%d\n",
3932                                __FILE__,__LINE__,rc);
3933                 put_tty_driver(serial_driver);
3934         }
3935
3936         /* reset devices */
3937         info = synclinkmp_device_list;
3938         while(info) {
3939                 reset_port(info);
3940                 info = info->next_device;
3941         }
3942
3943         /* release devices */
3944         info = synclinkmp_device_list;
3945         while(info) {
3946 #if SYNCLINK_GENERIC_HDLC
3947                 hdlcdev_exit(info);
3948 #endif
3949                 free_dma_bufs(info);
3950                 free_tmp_rx_buf(info);
3951                 if ( info->port_num == 0 ) {
3952                         if (info->sca_base)
3953                                 write_reg(info, LPR, 1); /* set low power mode */
3954                         release_resources(info);
3955                 }
3956                 tmp = info;
3957                 info = info->next_device;
3958                 tty_port_destroy(&tmp->port);
3959                 kfree(tmp);
3960         }
3961
3962         pci_unregister_driver(&synclinkmp_pci_driver);
3963 }
3964
3965 /* Driver initialization entry point.
3966  */
3967
3968 static int __init synclinkmp_init(void)
3969 {
3970         int rc;
3971
3972         if (break_on_load) {
3973                 synclinkmp_get_text_ptr();
3974                 BREAKPOINT();
3975         }
3976
3977         printk("%s %s\n", driver_name, driver_version);
3978
3979         if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
3980                 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
3981                 return rc;
3982         }
3983
3984         serial_driver = alloc_tty_driver(128);
3985         if (!serial_driver) {
3986                 rc = -ENOMEM;
3987                 goto error;
3988         }
3989
3990         /* Initialize the tty_driver structure */
3991
3992         serial_driver->driver_name = "synclinkmp";
3993         serial_driver->name = "ttySLM";
3994         serial_driver->major = ttymajor;
3995         serial_driver->minor_start = 64;
3996         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3997         serial_driver->subtype = SERIAL_TYPE_NORMAL;
3998         serial_driver->init_termios = tty_std_termios;
3999         serial_driver->init_termios.c_cflag =
4000                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4001         serial_driver->init_termios.c_ispeed = 9600;
4002         serial_driver->init_termios.c_ospeed = 9600;
4003         serial_driver->flags = TTY_DRIVER_REAL_RAW;
4004         tty_set_operations(serial_driver, &ops);
4005         if ((rc = tty_register_driver(serial_driver)) < 0) {
4006                 printk("%s(%d):Couldn't register serial driver\n",
4007                         __FILE__,__LINE__);
4008                 put_tty_driver(serial_driver);
4009                 serial_driver = NULL;
4010                 goto error;
4011         }
4012
4013         printk("%s %s, tty major#%d\n",
4014                 driver_name, driver_version,
4015                 serial_driver->major);
4016
4017         return 0;
4018
4019 error:
4020         synclinkmp_cleanup();
4021         return rc;
4022 }
4023
4024 static void __exit synclinkmp_exit(void)
4025 {
4026         synclinkmp_cleanup();
4027 }
4028
4029 module_init(synclinkmp_init);
4030 module_exit(synclinkmp_exit);
4031
4032 /* Set the port for internal loopback mode.
4033  * The TxCLK and RxCLK signals are generated from the BRG and
4034  * the TxD is looped back to the RxD internally.
4035  */
4036 static void enable_loopback(SLMP_INFO *info, int enable)
4037 {
4038         if (enable) {
4039                 /* MD2 (Mode Register 2)
4040                  * 01..00  CNCT<1..0> Channel Connection 11=Local Loopback
4041                  */
4042                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4043
4044                 /* degate external TxC clock source */
4045                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4046                 write_control_reg(info);
4047
4048                 /* RXS/TXS (Rx/Tx clock source)
4049                  * 07      Reserved, must be 0
4050                  * 06..04  Clock Source, 100=BRG
4051                  * 03..00  Clock Divisor, 0000=1
4052                  */
4053                 write_reg(info, RXS, 0x40);
4054                 write_reg(info, TXS, 0x40);
4055
4056         } else {
4057                 /* MD2 (Mode Register 2)
4058                  * 01..00  CNCT<1..0> Channel connection, 0=normal
4059                  */
4060                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4061
4062                 /* RXS/TXS (Rx/Tx clock source)
4063                  * 07      Reserved, must be 0
4064                  * 06..04  Clock Source, 000=RxC/TxC Pin
4065                  * 03..00  Clock Divisor, 0000=1
4066                  */
4067                 write_reg(info, RXS, 0x00);
4068                 write_reg(info, TXS, 0x00);
4069         }
4070
4071         /* set LinkSpeed if available, otherwise default to 2Mbps */
4072         if (info->params.clock_speed)
4073                 set_rate(info, info->params.clock_speed);
4074         else
4075                 set_rate(info, 3686400);
4076 }
4077
4078 /* Set the baud rate register to the desired speed
4079  *
4080  *      data_rate       data rate of clock in bits per second
4081  *                      A data rate of 0 disables the AUX clock.
4082  */
4083 static void set_rate( SLMP_INFO *info, u32 data_rate )
4084 {
4085         u32 TMCValue;
4086         unsigned char BRValue;
4087         u32 Divisor=0;
4088
4089         /* fBRG = fCLK/(TMC * 2^BR)
4090          */
4091         if (data_rate != 0) {
4092                 Divisor = 14745600/data_rate;
4093                 if (!Divisor)
4094                         Divisor = 1;
4095
4096                 TMCValue = Divisor;
4097
4098                 BRValue = 0;
4099                 if (TMCValue != 1 && TMCValue != 2) {
4100                         /* BRValue of 0 provides 50/50 duty cycle *only* when
4101                          * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4102                          * 50/50 duty cycle.
4103                          */
4104                         BRValue = 1;
4105                         TMCValue >>= 1;
4106                 }
4107
4108                 /* while TMCValue is too big for TMC register, divide
4109                  * by 2 and increment BR exponent.
4110                  */
4111                 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4112                         TMCValue >>= 1;
4113
4114                 write_reg(info, TXS,
4115                         (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4116                 write_reg(info, RXS,
4117                         (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4118                 write_reg(info, TMC, (unsigned char)TMCValue);
4119         }
4120         else {
4121                 write_reg(info, TXS,0);
4122                 write_reg(info, RXS,0);
4123                 write_reg(info, TMC, 0);
4124         }
4125 }
4126
4127 /* Disable receiver
4128  */
4129 static void rx_stop(SLMP_INFO *info)
4130 {
4131         if (debug_level >= DEBUG_LEVEL_ISR)
4132                 printk("%s(%d):%s rx_stop()\n",
4133                          __FILE__,__LINE__, info->device_name );
4134
4135         write_reg(info, CMD, RXRESET);
4136
4137         info->ie0_value &= ~RXRDYE;
4138         write_reg(info, IE0, info->ie0_value);  /* disable Rx data interrupts */
4139
4140         write_reg(info, RXDMA + DSR, 0);        /* disable Rx DMA */
4141         write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4142         write_reg(info, RXDMA + DIR, 0);        /* disable Rx DMA interrupts */
4143
4144         info->rx_enabled = false;
4145         info->rx_overflow = false;
4146 }
4147
4148 /* enable the receiver
4149  */
4150 static void rx_start(SLMP_INFO *info)
4151 {
4152         int i;
4153
4154         if (debug_level >= DEBUG_LEVEL_ISR)
4155                 printk("%s(%d):%s rx_start()\n",
4156                          __FILE__,__LINE__, info->device_name );
4157
4158         write_reg(info, CMD, RXRESET);
4159
4160         if ( info->params.mode == MGSL_MODE_HDLC ) {
4161                 /* HDLC, disabe IRQ on rxdata */
4162                 info->ie0_value &= ~RXRDYE;
4163                 write_reg(info, IE0, info->ie0_value);
4164
4165                 /* Reset all Rx DMA buffers and program rx dma */
4166                 write_reg(info, RXDMA + DSR, 0);                /* disable Rx DMA */
4167                 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4168
4169                 for (i = 0; i < info->rx_buf_count; i++) {
4170                         info->rx_buf_list[i].status = 0xff;
4171
4172                         // throttle to 4 shared memory writes at a time to prevent
4173                         // hogging local bus (keep latency time for DMA requests low).
4174                         if (!(i % 4))
4175                                 read_status_reg(info);
4176                 }
4177                 info->current_rx_buf = 0;
4178
4179                 /* set current/1st descriptor address */
4180                 write_reg16(info, RXDMA + CDA,
4181                         info->rx_buf_list_ex[0].phys_entry);
4182
4183                 /* set new last rx descriptor address */
4184                 write_reg16(info, RXDMA + EDA,
4185                         info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4186
4187                 /* set buffer length (shared by all rx dma data buffers) */
4188                 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4189
4190                 write_reg(info, RXDMA + DIR, 0x60);     /* enable Rx DMA interrupts (EOM/BOF) */
4191                 write_reg(info, RXDMA + DSR, 0xf2);     /* clear Rx DMA IRQs, enable Rx DMA */
4192         } else {
4193                 /* async, enable IRQ on rxdata */
4194                 info->ie0_value |= RXRDYE;
4195                 write_reg(info, IE0, info->ie0_value);
4196         }
4197
4198         write_reg(info, CMD, RXENABLE);
4199
4200         info->rx_overflow = false;
4201         info->rx_enabled = true;
4202 }
4203
4204 /* Enable the transmitter and send a transmit frame if
4205  * one is loaded in the DMA buffers.
4206  */
4207 static void tx_start(SLMP_INFO *info)
4208 {
4209         if (debug_level >= DEBUG_LEVEL_ISR)
4210                 printk("%s(%d):%s tx_start() tx_count=%d\n",
4211                          __FILE__,__LINE__, info->device_name,info->tx_count );
4212
4213         if (!info->tx_enabled ) {
4214                 write_reg(info, CMD, TXRESET);
4215                 write_reg(info, CMD, TXENABLE);
4216                 info->tx_enabled = true;
4217         }
4218
4219         if ( info->tx_count ) {
4220
4221                 /* If auto RTS enabled and RTS is inactive, then assert */
4222                 /* RTS and set a flag indicating that the driver should */
4223                 /* negate RTS when the transmission completes. */
4224
4225                 info->drop_rts_on_tx_done = false;
4226
4227                 if (info->params.mode != MGSL_MODE_ASYNC) {
4228
4229                         if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4230                                 get_signals( info );
4231                                 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4232                                         info->serial_signals |= SerialSignal_RTS;
4233                                         set_signals( info );
4234                                         info->drop_rts_on_tx_done = true;
4235                                 }
4236                         }
4237
4238                         write_reg16(info, TRC0,
4239                                 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4240
4241                         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4242                         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4243         
4244                         /* set TX CDA (current descriptor address) */
4245                         write_reg16(info, TXDMA + CDA,
4246                                 info->tx_buf_list_ex[0].phys_entry);
4247         
4248                         /* set TX EDA (last descriptor address) */
4249                         write_reg16(info, TXDMA + EDA,
4250                                 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4251         
4252                         /* enable underrun IRQ */
4253                         info->ie1_value &= ~IDLE;
4254                         info->ie1_value |= UDRN;
4255                         write_reg(info, IE1, info->ie1_value);
4256                         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4257         
4258                         write_reg(info, TXDMA + DIR, 0x40);             /* enable Tx DMA interrupts (EOM) */
4259                         write_reg(info, TXDMA + DSR, 0xf2);             /* clear Tx DMA IRQs, enable Tx DMA */
4260         
4261                         mod_timer(&info->tx_timer, jiffies +
4262                                         msecs_to_jiffies(5000));
4263                 }
4264                 else {
4265                         tx_load_fifo(info);
4266                         /* async, enable IRQ on txdata */
4267                         info->ie0_value |= TXRDYE;
4268                         write_reg(info, IE0, info->ie0_value);
4269                 }
4270
4271                 info->tx_active = true;
4272         }
4273 }
4274
4275 /* stop the transmitter and DMA
4276  */
4277 static void tx_stop( SLMP_INFO *info )
4278 {
4279         if (debug_level >= DEBUG_LEVEL_ISR)
4280                 printk("%s(%d):%s tx_stop()\n",
4281                          __FILE__,__LINE__, info->device_name );
4282
4283         del_timer(&info->tx_timer);
4284
4285         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4286         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4287
4288         write_reg(info, CMD, TXRESET);
4289
4290         info->ie1_value &= ~(UDRN + IDLE);
4291         write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
4292         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
4293
4294         info->ie0_value &= ~TXRDYE;
4295         write_reg(info, IE0, info->ie0_value);  /* disable tx data interrupts */
4296
4297         info->tx_enabled = false;
4298         info->tx_active = false;
4299 }
4300
4301 /* Fill the transmit FIFO until the FIFO is full or
4302  * there is no more data to load.
4303  */
4304 static void tx_load_fifo(SLMP_INFO *info)
4305 {
4306         u8 TwoBytes[2];
4307
4308         /* do nothing is now tx data available and no XON/XOFF pending */
4309
4310         if ( !info->tx_count && !info->x_char )
4311                 return;
4312
4313         /* load the Transmit FIFO until FIFOs full or all data sent */
4314
4315         while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4316
4317                 /* there is more space in the transmit FIFO and */
4318                 /* there is more data in transmit buffer */
4319
4320                 if ( (info->tx_count > 1) && !info->x_char ) {
4321                         /* write 16-bits */
4322                         TwoBytes[0] = info->tx_buf[info->tx_get++];
4323                         if (info->tx_get >= info->max_frame_size)
4324                                 info->tx_get -= info->max_frame_size;
4325                         TwoBytes[1] = info->tx_buf[info->tx_get++];
4326                         if (info->tx_get >= info->max_frame_size)
4327                                 info->tx_get -= info->max_frame_size;
4328
4329                         write_reg16(info, TRB, *((u16 *)TwoBytes));
4330
4331                         info->tx_count -= 2;
4332                         info->icount.tx += 2;
4333                 } else {
4334                         /* only 1 byte left to transmit or 1 FIFO slot left */
4335
4336                         if (info->x_char) {
4337                                 /* transmit pending high priority char */
4338                                 write_reg(info, TRB, info->x_char);
4339                                 info->x_char = 0;
4340                         } else {
4341                                 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4342                                 if (info->tx_get >= info->max_frame_size)
4343                                         info->tx_get -= info->max_frame_size;
4344                                 info->tx_count--;
4345                         }
4346                         info->icount.tx++;
4347                 }
4348         }
4349 }
4350
4351 /* Reset a port to a known state
4352  */
4353 static void reset_port(SLMP_INFO *info)
4354 {
4355         if (info->sca_base) {
4356
4357                 tx_stop(info);
4358                 rx_stop(info);
4359
4360                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
4361                 set_signals(info);
4362
4363                 /* disable all port interrupts */
4364                 info->ie0_value = 0;
4365                 info->ie1_value = 0;
4366                 info->ie2_value = 0;
4367                 write_reg(info, IE0, info->ie0_value);
4368                 write_reg(info, IE1, info->ie1_value);
4369                 write_reg(info, IE2, info->ie2_value);
4370
4371                 write_reg(info, CMD, CHRESET);
4372         }
4373 }
4374
4375 /* Reset all the ports to a known state.
4376  */
4377 static void reset_adapter(SLMP_INFO *info)
4378 {
4379         int i;
4380
4381         for ( i=0; i < SCA_MAX_PORTS; ++i) {
4382                 if (info->port_array[i])
4383                         reset_port(info->port_array[i]);
4384         }
4385 }
4386
4387 /* Program port for asynchronous communications.
4388  */
4389 static void async_mode(SLMP_INFO *info)
4390 {
4391
4392         unsigned char RegValue;
4393
4394         tx_stop(info);
4395         rx_stop(info);
4396
4397         /* MD0, Mode Register 0
4398          *
4399          * 07..05  PRCTL<2..0>, Protocol Mode, 000=async
4400          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4401          * 03      Reserved, must be 0
4402          * 02      CRCCC, CRC Calculation, 0=disabled
4403          * 01..00  STOP<1..0> Stop bits (00=1,10=2)
4404          *
4405          * 0000 0000
4406          */
4407         RegValue = 0x00;
4408         if (info->params.stop_bits != 1)
4409                 RegValue |= BIT1;
4410         write_reg(info, MD0, RegValue);
4411
4412         /* MD1, Mode Register 1
4413          *
4414          * 07..06  BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4415          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4416          * 03..02  RXCHR<1..0>, rx char size
4417          * 01..00  PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4418          *
4419          * 0100 0000
4420          */
4421         RegValue = 0x40;
4422         switch (info->params.data_bits) {
4423         case 7: RegValue |= BIT4 + BIT2; break;
4424         case 6: RegValue |= BIT5 + BIT3; break;
4425         case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4426         }
4427         if (info->params.parity != ASYNC_PARITY_NONE) {
4428                 RegValue |= BIT1;
4429                 if (info->params.parity == ASYNC_PARITY_ODD)
4430                         RegValue |= BIT0;
4431         }
4432         write_reg(info, MD1, RegValue);
4433
4434         /* MD2, Mode Register 2
4435          *
4436          * 07..02  Reserved, must be 0
4437          * 01..00  CNCT<1..0> Channel connection, 00=normal 11=local loopback
4438          *
4439          * 0000 0000
4440          */
4441         RegValue = 0x00;
4442         if (info->params.loopback)
4443                 RegValue |= (BIT1 + BIT0);
4444         write_reg(info, MD2, RegValue);
4445
4446         /* RXS, Receive clock source
4447          *
4448          * 07      Reserved, must be 0
4449          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4450          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4451          */
4452         RegValue=BIT6;
4453         write_reg(info, RXS, RegValue);
4454
4455         /* TXS, Transmit clock source
4456          *
4457          * 07      Reserved, must be 0
4458          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4459          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4460          */
4461         RegValue=BIT6;
4462         write_reg(info, TXS, RegValue);
4463
4464         /* Control Register
4465          *
4466          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4467          */
4468         info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4469         write_control_reg(info);
4470
4471         tx_set_idle(info);
4472
4473         /* RRC Receive Ready Control 0
4474          *
4475          * 07..05  Reserved, must be 0
4476          * 04..00  RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4477          */
4478         write_reg(info, RRC, 0x00);
4479
4480         /* TRC0 Transmit Ready Control 0
4481          *
4482          * 07..05  Reserved, must be 0
4483          * 04..00  TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4484          */
4485         write_reg(info, TRC0, 0x10);
4486
4487         /* TRC1 Transmit Ready Control 1
4488          *
4489          * 07..05  Reserved, must be 0
4490          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4491          */
4492         write_reg(info, TRC1, 0x1e);
4493
4494         /* CTL, MSCI control register
4495          *
4496          * 07..06  Reserved, set to 0
4497          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4498          * 04      IDLC, idle control, 0=mark 1=idle register
4499          * 03      BRK, break, 0=off 1 =on (async)
4500          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4501          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4502          * 00      RTS, RTS output control, 0=active 1=inactive
4503          *
4504          * 0001 0001
4505          */
4506         RegValue = 0x10;
4507         if (!(info->serial_signals & SerialSignal_RTS))
4508                 RegValue |= 0x01;
4509         write_reg(info, CTL, RegValue);
4510
4511         /* enable status interrupts */
4512         info->ie0_value |= TXINTE + RXINTE;
4513         write_reg(info, IE0, info->ie0_value);
4514
4515         /* enable break detect interrupt */
4516         info->ie1_value = BRKD;
4517         write_reg(info, IE1, info->ie1_value);
4518
4519         /* enable rx overrun interrupt */
4520         info->ie2_value = OVRN;
4521         write_reg(info, IE2, info->ie2_value);
4522
4523         set_rate( info, info->params.data_rate * 16 );
4524 }
4525
4526 /* Program the SCA for HDLC communications.
4527  */
4528 static void hdlc_mode(SLMP_INFO *info)
4529 {
4530         unsigned char RegValue;
4531         u32 DpllDivisor;
4532
4533         // Can't use DPLL because SCA outputs recovered clock on RxC when
4534         // DPLL mode selected. This causes output contention with RxC receiver.
4535         // Use of DPLL would require external hardware to disable RxC receiver
4536         // when DPLL mode selected.
4537         info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4538
4539         /* disable DMA interrupts */
4540         write_reg(info, TXDMA + DIR, 0);
4541         write_reg(info, RXDMA + DIR, 0);
4542
4543         /* MD0, Mode Register 0
4544          *
4545          * 07..05  PRCTL<2..0>, Protocol Mode, 100=HDLC
4546          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4547          * 03      Reserved, must be 0
4548          * 02      CRCCC, CRC Calculation, 1=enabled
4549          * 01      CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4550          * 00      CRC0, CRC initial value, 1 = all 1s
4551          *
4552          * 1000 0001
4553          */
4554         RegValue = 0x81;
4555         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4556                 RegValue |= BIT4;
4557         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4558                 RegValue |= BIT4;
4559         if (info->params.crc_type == HDLC_CRC_16_CCITT)
4560                 RegValue |= BIT2 + BIT1;
4561         write_reg(info, MD0, RegValue);
4562
4563         /* MD1, Mode Register 1
4564          *
4565          * 07..06  ADDRS<1..0>, Address detect, 00=no addr check
4566          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits
4567          * 03..02  RXCHR<1..0>, rx char size, 00=8 bits
4568          * 01..00  PMPM<1..0>, Parity mode, 00=no parity
4569          *
4570          * 0000 0000
4571          */
4572         RegValue = 0x00;
4573         write_reg(info, MD1, RegValue);
4574
4575         /* MD2, Mode Register 2
4576          *
4577          * 07      NRZFM, 0=NRZ, 1=FM
4578          * 06..05  CODE<1..0> Encoding, 00=NRZ
4579          * 04..03  DRATE<1..0> DPLL Divisor, 00=8
4580          * 02      Reserved, must be 0
4581          * 01..00  CNCT<1..0> Channel connection, 0=normal
4582          *
4583          * 0000 0000
4584          */
4585         RegValue = 0x00;
4586         switch(info->params.encoding) {
4587         case HDLC_ENCODING_NRZI:          RegValue |= BIT5; break;
4588         case HDLC_ENCODING_BIPHASE_MARK:  RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4589         case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4590         case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break;      /* aka Manchester */
4591 #if 0
4592         case HDLC_ENCODING_NRZB:                                        /* not supported */
4593         case HDLC_ENCODING_NRZI_MARK:                                   /* not supported */
4594         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:                          /* not supported */
4595 #endif
4596         }
4597         if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4598                 DpllDivisor = 16;
4599                 RegValue |= BIT3;
4600         } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4601                 DpllDivisor = 8;
4602         } else {
4603                 DpllDivisor = 32;
4604                 RegValue |= BIT4;
4605         }
4606         write_reg(info, MD2, RegValue);
4607
4608
4609         /* RXS, Receive clock source
4610          *
4611          * 07      Reserved, must be 0
4612          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4613          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4614          */
4615         RegValue=0;
4616         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4617                 RegValue |= BIT6;
4618         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4619                 RegValue |= BIT6 + BIT5;
4620         write_reg(info, RXS, RegValue);
4621
4622         /* TXS, Transmit clock source
4623          *
4624          * 07      Reserved, must be 0
4625          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4626          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4627          */
4628         RegValue=0;
4629         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4630                 RegValue |= BIT6;
4631         if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4632                 RegValue |= BIT6 + BIT5;
4633         write_reg(info, TXS, RegValue);
4634
4635         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4636                 set_rate(info, info->params.clock_speed * DpllDivisor);
4637         else
4638                 set_rate(info, info->params.clock_speed);
4639
4640         /* GPDATA (General Purpose I/O Data Register)
4641          *
4642          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4643          */
4644         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4645                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4646         else
4647                 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4648         write_control_reg(info);
4649
4650         /* RRC Receive Ready Control 0
4651          *
4652          * 07..05  Reserved, must be 0
4653          * 04..00  RRC<4..0> Rx FIFO trigger active
4654          */
4655         write_reg(info, RRC, rx_active_fifo_level);
4656
4657         /* TRC0 Transmit Ready Control 0
4658          *
4659          * 07..05  Reserved, must be 0
4660          * 04..00  TRC<4..0> Tx FIFO trigger active
4661          */
4662         write_reg(info, TRC0, tx_active_fifo_level);
4663
4664         /* TRC1 Transmit Ready Control 1
4665          *
4666          * 07..05  Reserved, must be 0
4667          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4668          */
4669         write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4670
4671         /* DMR, DMA Mode Register
4672          *
4673          * 07..05  Reserved, must be 0
4674          * 04      TMOD, Transfer Mode: 1=chained-block
4675          * 03      Reserved, must be 0
4676          * 02      NF, Number of Frames: 1=multi-frame
4677          * 01      CNTE, Frame End IRQ Counter enable: 0=disabled
4678          * 00      Reserved, must be 0
4679          *
4680          * 0001 0100
4681          */
4682         write_reg(info, TXDMA + DMR, 0x14);
4683         write_reg(info, RXDMA + DMR, 0x14);
4684
4685         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4686         write_reg(info, RXDMA + CPB,
4687                 (unsigned char)(info->buffer_list_phys >> 16));
4688
4689         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4690         write_reg(info, TXDMA + CPB,
4691                 (unsigned char)(info->buffer_list_phys >> 16));
4692
4693         /* enable status interrupts. other code enables/disables
4694          * the individual sources for these two interrupt classes.
4695          */
4696         info->ie0_value |= TXINTE + RXINTE;
4697         write_reg(info, IE0, info->ie0_value);
4698
4699         /* CTL, MSCI control register
4700          *
4701          * 07..06  Reserved, set to 0
4702          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4703          * 04      IDLC, idle control, 0=mark 1=idle register
4704          * 03      BRK, break, 0=off 1 =on (async)
4705          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4706          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4707          * 00      RTS, RTS output control, 0=active 1=inactive
4708          *
4709          * 0001 0001
4710          */
4711         RegValue = 0x10;
4712         if (!(info->serial_signals & SerialSignal_RTS))
4713                 RegValue |= 0x01;
4714         write_reg(info, CTL, RegValue);
4715
4716         /* preamble not supported ! */
4717
4718         tx_set_idle(info);
4719         tx_stop(info);
4720         rx_stop(info);
4721
4722         set_rate(info, info->params.clock_speed);
4723
4724         if (info->params.loopback)
4725                 enable_loopback(info,1);
4726 }
4727
4728 /* Set the transmit HDLC idle mode
4729  */
4730 static void tx_set_idle(SLMP_INFO *info)
4731 {
4732         unsigned char RegValue = 0xff;
4733
4734         /* Map API idle mode to SCA register bits */
4735         switch(info->idle_mode) {
4736         case HDLC_TXIDLE_FLAGS:                 RegValue = 0x7e; break;
4737         case HDLC_TXIDLE_ALT_ZEROS_ONES:        RegValue = 0xaa; break;
4738         case HDLC_TXIDLE_ZEROS:                 RegValue = 0x00; break;
4739         case HDLC_TXIDLE_ONES:                  RegValue = 0xff; break;
4740         case HDLC_TXIDLE_ALT_MARK_SPACE:        RegValue = 0xaa; break;
4741         case HDLC_TXIDLE_SPACE:                 RegValue = 0x00; break;
4742         case HDLC_TXIDLE_MARK:                  RegValue = 0xff; break;
4743         }
4744
4745         write_reg(info, IDL, RegValue);
4746 }
4747
4748 /* Query the adapter for the state of the V24 status (input) signals.
4749  */
4750 static void get_signals(SLMP_INFO *info)
4751 {
4752         u16 status = read_reg(info, SR3);
4753         u16 gpstatus = read_status_reg(info);
4754         u16 testbit;
4755
4756         /* clear all serial signals except DTR and RTS */
4757         info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
4758
4759         /* set serial signal bits to reflect MISR */
4760
4761         if (!(status & BIT3))
4762                 info->serial_signals |= SerialSignal_CTS;
4763
4764         if ( !(status & BIT2))
4765                 info->serial_signals |= SerialSignal_DCD;
4766
4767         testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4768         if (!(gpstatus & testbit))
4769                 info->serial_signals |= SerialSignal_RI;
4770
4771         testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4772         if (!(gpstatus & testbit))
4773                 info->serial_signals |= SerialSignal_DSR;
4774 }
4775
4776 /* Set the state of DTR and RTS based on contents of
4777  * serial_signals member of device context.
4778  */
4779 static void set_signals(SLMP_INFO *info)
4780 {
4781         unsigned char RegValue;
4782         u16 EnableBit;
4783
4784         RegValue = read_reg(info, CTL);
4785         if (info->serial_signals & SerialSignal_RTS)
4786                 RegValue &= ~BIT0;
4787         else
4788                 RegValue |= BIT0;
4789         write_reg(info, CTL, RegValue);
4790
4791         // Port 0..3 DTR is ctrl reg <1,3,5,7>
4792         EnableBit = BIT1 << (info->port_num*2);
4793         if (info->serial_signals & SerialSignal_DTR)
4794                 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4795         else
4796                 info->port_array[0]->ctrlreg_value |= EnableBit;
4797         write_control_reg(info);
4798 }
4799
4800 /*******************/
4801 /* DMA Buffer Code */
4802 /*******************/
4803
4804 /* Set the count for all receive buffers to SCABUFSIZE
4805  * and set the current buffer to the first buffer. This effectively
4806  * makes all buffers free and discards any data in buffers.
4807  */
4808 static void rx_reset_buffers(SLMP_INFO *info)
4809 {
4810         rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4811 }
4812
4813 /* Free the buffers used by a received frame
4814  *
4815  * info   pointer to device instance data
4816  * first  index of 1st receive buffer of frame
4817  * last   index of last receive buffer of frame
4818  */
4819 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4820 {
4821         bool done = false;
4822
4823         while(!done) {
4824                 /* reset current buffer for reuse */
4825                 info->rx_buf_list[first].status = 0xff;
4826
4827                 if (first == last) {
4828                         done = true;
4829                         /* set new last rx descriptor address */
4830                         write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4831                 }
4832
4833                 first++;
4834                 if (first == info->rx_buf_count)
4835                         first = 0;
4836         }
4837
4838         /* set current buffer to next buffer after last buffer of frame */
4839         info->current_rx_buf = first;
4840 }
4841
4842 /* Return a received frame from the receive DMA buffers.
4843  * Only frames received without errors are returned.
4844  *
4845  * Return Value:        true if frame returned, otherwise false
4846  */
4847 static bool rx_get_frame(SLMP_INFO *info)
4848 {
4849         unsigned int StartIndex, EndIndex;      /* index of 1st and last buffers of Rx frame */
4850         unsigned short status;
4851         unsigned int framesize = 0;
4852         bool ReturnCode = false;
4853         unsigned long flags;
4854         struct tty_struct *tty = info->port.tty;
4855         unsigned char addr_field = 0xff;
4856         SCADESC *desc;
4857         SCADESC_EX *desc_ex;
4858
4859 CheckAgain:
4860         /* assume no frame returned, set zero length */
4861         framesize = 0;
4862         addr_field = 0xff;
4863
4864         /*
4865          * current_rx_buf points to the 1st buffer of the next available
4866          * receive frame. To find the last buffer of the frame look for
4867          * a non-zero status field in the buffer entries. (The status
4868          * field is set by the 16C32 after completing a receive frame.
4869          */
4870         StartIndex = EndIndex = info->current_rx_buf;
4871
4872         for ( ;; ) {
4873                 desc = &info->rx_buf_list[EndIndex];
4874                 desc_ex = &info->rx_buf_list_ex[EndIndex];
4875
4876                 if (desc->status == 0xff)
4877                         goto Cleanup;   /* current desc still in use, no frames available */
4878
4879                 if (framesize == 0 && info->params.addr_filter != 0xff)
4880                         addr_field = desc_ex->virt_addr[0];
4881
4882                 framesize += desc->length;
4883
4884                 /* Status != 0 means last buffer of frame */
4885                 if (desc->status)
4886                         break;
4887
4888                 EndIndex++;
4889                 if (EndIndex == info->rx_buf_count)
4890                         EndIndex = 0;
4891
4892                 if (EndIndex == info->current_rx_buf) {
4893                         /* all buffers have been 'used' but none mark      */
4894                         /* the end of a frame. Reset buffers and receiver. */
4895                         if ( info->rx_enabled ){
4896                                 spin_lock_irqsave(&info->lock,flags);
4897                                 rx_start(info);
4898                                 spin_unlock_irqrestore(&info->lock,flags);
4899                         }
4900                         goto Cleanup;
4901                 }
4902
4903         }
4904
4905         /* check status of receive frame */
4906
4907         /* frame status is byte stored after frame data
4908          *
4909          * 7 EOM (end of msg), 1 = last buffer of frame
4910          * 6 Short Frame, 1 = short frame
4911          * 5 Abort, 1 = frame aborted
4912          * 4 Residue, 1 = last byte is partial
4913          * 3 Overrun, 1 = overrun occurred during frame reception
4914          * 2 CRC,     1 = CRC error detected
4915          *
4916          */
4917         status = desc->status;
4918
4919         /* ignore CRC bit if not using CRC (bit is undefined) */
4920         /* Note:CRC is not save to data buffer */
4921         if (info->params.crc_type == HDLC_CRC_NONE)
4922                 status &= ~BIT2;
4923
4924         if (framesize == 0 ||
4925                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4926                 /* discard 0 byte frames, this seems to occur sometime
4927                  * when remote is idling flags.
4928                  */
4929                 rx_free_frame_buffers(info, StartIndex, EndIndex);
4930                 goto CheckAgain;
4931         }
4932
4933         if (framesize < 2)
4934                 status |= BIT6;
4935
4936         if (status & (BIT6+BIT5+BIT3+BIT2)) {
4937                 /* received frame has errors,
4938                  * update counts and mark frame size as 0
4939                  */
4940                 if (status & BIT6)
4941                         info->icount.rxshort++;
4942                 else if (status & BIT5)
4943                         info->icount.rxabort++;
4944                 else if (status & BIT3)
4945                         info->icount.rxover++;
4946                 else
4947                         info->icount.rxcrc++;
4948
4949                 framesize = 0;
4950 #if SYNCLINK_GENERIC_HDLC
4951                 {
4952                         info->netdev->stats.rx_errors++;
4953                         info->netdev->stats.rx_frame_errors++;
4954                 }
4955 #endif
4956         }
4957
4958         if ( debug_level >= DEBUG_LEVEL_BH )
4959                 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4960                         __FILE__,__LINE__,info->device_name,status,framesize);
4961
4962         if ( debug_level >= DEBUG_LEVEL_DATA )
4963                 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
4964                         min_t(unsigned int, framesize, SCABUFSIZE), 0);
4965
4966         if (framesize) {
4967                 if (framesize > info->max_frame_size)
4968                         info->icount.rxlong++;
4969                 else {
4970                         /* copy dma buffer(s) to contiguous intermediate buffer */
4971                         int copy_count = framesize;
4972                         int index = StartIndex;
4973                         unsigned char *ptmp = info->tmp_rx_buf;
4974                         info->tmp_rx_buf_count = framesize;
4975
4976                         info->icount.rxok++;
4977
4978                         while(copy_count) {
4979                                 int partial_count = min(copy_count,SCABUFSIZE);
4980                                 memcpy( ptmp,
4981                                         info->rx_buf_list_ex[index].virt_addr,
4982                                         partial_count );
4983                                 ptmp += partial_count;
4984                                 copy_count -= partial_count;
4985
4986                                 if ( ++index == info->rx_buf_count )
4987                                         index = 0;
4988                         }
4989
4990 #if SYNCLINK_GENERIC_HDLC
4991                         if (info->netcount)
4992                                 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
4993                         else
4994 #endif
4995                                 ldisc_receive_buf(tty,info->tmp_rx_buf,
4996                                                   info->flag_buf, framesize);
4997                 }
4998         }
4999         /* Free the buffers used by this frame. */
5000         rx_free_frame_buffers( info, StartIndex, EndIndex );
5001
5002         ReturnCode = true;
5003
5004 Cleanup:
5005         if ( info->rx_enabled && info->rx_overflow ) {
5006                 /* Receiver is enabled, but needs to restarted due to
5007                  * rx buffer overflow. If buffers are empty, restart receiver.
5008                  */
5009                 if (info->rx_buf_list[EndIndex].status == 0xff) {
5010                         spin_lock_irqsave(&info->lock,flags);
5011                         rx_start(info);
5012                         spin_unlock_irqrestore(&info->lock,flags);
5013                 }
5014         }
5015
5016         return ReturnCode;
5017 }
5018
5019 /* load the transmit DMA buffer with data
5020  */
5021 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5022 {
5023         unsigned short copy_count;
5024         unsigned int i = 0;
5025         SCADESC *desc;
5026         SCADESC_EX *desc_ex;
5027
5028         if ( debug_level >= DEBUG_LEVEL_DATA )
5029                 trace_block(info, buf, min_t(unsigned int, count, SCABUFSIZE), 1);
5030
5031         /* Copy source buffer to one or more DMA buffers, starting with
5032          * the first transmit dma buffer.
5033          */
5034         for(i=0;;)
5035         {
5036                 copy_count = min_t(unsigned int, count, SCABUFSIZE);
5037
5038                 desc = &info->tx_buf_list[i];
5039                 desc_ex = &info->tx_buf_list_ex[i];
5040
5041                 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5042
5043                 desc->length = copy_count;
5044                 desc->status = 0;
5045
5046                 buf += copy_count;
5047                 count -= copy_count;
5048
5049                 if (!count)
5050                         break;
5051
5052                 i++;
5053                 if (i >= info->tx_buf_count)
5054                         i = 0;
5055         }
5056
5057         info->tx_buf_list[i].status = 0x81;     /* set EOM and EOT status */
5058         info->last_tx_buf = ++i;
5059 }
5060
5061 static bool register_test(SLMP_INFO *info)
5062 {
5063         static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5064         static unsigned int count = ARRAY_SIZE(testval);
5065         unsigned int i;
5066         bool rc = true;
5067         unsigned long flags;
5068
5069         spin_lock_irqsave(&info->lock,flags);
5070         reset_port(info);
5071
5072         /* assume failure */
5073         info->init_error = DiagStatus_AddressFailure;
5074
5075         /* Write bit patterns to various registers but do it out of */
5076         /* sync, then read back and verify values. */
5077
5078         for (i = 0 ; i < count ; i++) {
5079                 write_reg(info, TMC, testval[i]);
5080                 write_reg(info, IDL, testval[(i+1)%count]);
5081                 write_reg(info, SA0, testval[(i+2)%count]);
5082                 write_reg(info, SA1, testval[(i+3)%count]);
5083
5084                 if ( (read_reg(info, TMC) != testval[i]) ||
5085                           (read_reg(info, IDL) != testval[(i+1)%count]) ||
5086                           (read_reg(info, SA0) != testval[(i+2)%count]) ||
5087                           (read_reg(info, SA1) != testval[(i+3)%count]) )
5088                 {
5089                         rc = false;
5090                         break;
5091                 }
5092         }
5093
5094         reset_port(info);
5095         spin_unlock_irqrestore(&info->lock,flags);
5096
5097         return rc;
5098 }
5099
5100 static bool irq_test(SLMP_INFO *info)
5101 {
5102         unsigned long timeout;
5103         unsigned long flags;
5104
5105         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5106
5107         spin_lock_irqsave(&info->lock,flags);
5108         reset_port(info);
5109
5110         /* assume failure */
5111         info->init_error = DiagStatus_IrqFailure;
5112         info->irq_occurred = false;
5113
5114         /* setup timer0 on SCA0 to interrupt */
5115
5116         /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5117         write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5118
5119         write_reg(info, (unsigned char)(timer + TEPR), 0);      /* timer expand prescale */
5120         write_reg16(info, (unsigned char)(timer + TCONR), 1);   /* timer constant */
5121
5122
5123         /* TMCS, Timer Control/Status Register
5124          *
5125          * 07      CMF, Compare match flag (read only) 1=match
5126          * 06      ECMI, CMF Interrupt Enable: 1=enabled
5127          * 05      Reserved, must be 0
5128          * 04      TME, Timer Enable
5129          * 03..00  Reserved, must be 0
5130          *
5131          * 0101 0000
5132          */
5133         write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5134
5135         spin_unlock_irqrestore(&info->lock,flags);
5136
5137         timeout=100;
5138         while( timeout-- && !info->irq_occurred ) {
5139                 msleep_interruptible(10);
5140         }
5141
5142         spin_lock_irqsave(&info->lock,flags);
5143         reset_port(info);
5144         spin_unlock_irqrestore(&info->lock,flags);
5145
5146         return info->irq_occurred;
5147 }
5148
5149 /* initialize individual SCA device (2 ports)
5150  */
5151 static bool sca_init(SLMP_INFO *info)
5152 {
5153         /* set wait controller to single mem partition (low), no wait states */
5154         write_reg(info, PABR0, 0);      /* wait controller addr boundary 0 */
5155         write_reg(info, PABR1, 0);      /* wait controller addr boundary 1 */
5156         write_reg(info, WCRL, 0);       /* wait controller low range */
5157         write_reg(info, WCRM, 0);       /* wait controller mid range */
5158         write_reg(info, WCRH, 0);       /* wait controller high range */
5159
5160         /* DPCR, DMA Priority Control
5161          *
5162          * 07..05  Not used, must be 0
5163          * 04      BRC, bus release condition: 0=all transfers complete
5164          * 03      CCC, channel change condition: 0=every cycle
5165          * 02..00  PR<2..0>, priority 100=round robin
5166          *
5167          * 00000100 = 0x04
5168          */
5169         write_reg(info, DPCR, dma_priority);
5170
5171         /* DMA Master Enable, BIT7: 1=enable all channels */
5172         write_reg(info, DMER, 0x80);
5173
5174         /* enable all interrupt classes */
5175         write_reg(info, IER0, 0xff);    /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5176         write_reg(info, IER1, 0xff);    /* DMIB,DMIA (channels 0-3) */
5177         write_reg(info, IER2, 0xf0);    /* TIRQ (timers 0-3) */
5178
5179         /* ITCR, interrupt control register
5180          * 07      IPC, interrupt priority, 0=MSCI->DMA
5181          * 06..05  IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5182          * 04      VOS, Vector Output, 0=unmodified vector
5183          * 03..00  Reserved, must be 0
5184          */
5185         write_reg(info, ITCR, 0);
5186
5187         return true;
5188 }
5189
5190 /* initialize adapter hardware
5191  */
5192 static bool init_adapter(SLMP_INFO *info)
5193 {
5194         int i;
5195
5196         /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5197         volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5198         u32 readval;
5199
5200         info->misc_ctrl_value |= BIT30;
5201         *MiscCtrl = info->misc_ctrl_value;
5202
5203         /*
5204          * Force at least 170ns delay before clearing
5205          * reset bit. Each read from LCR takes at least
5206          * 30ns so 10 times for 300ns to be safe.
5207          */
5208         for(i=0;i<10;i++)
5209                 readval = *MiscCtrl;
5210
5211         info->misc_ctrl_value &= ~BIT30;
5212         *MiscCtrl = info->misc_ctrl_value;
5213
5214         /* init control reg (all DTRs off, all clksel=input) */
5215         info->ctrlreg_value = 0xaa;
5216         write_control_reg(info);
5217
5218         {
5219                 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5220                 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5221
5222                 switch(read_ahead_count)
5223                 {
5224                 case 16:
5225                         lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5226                         break;
5227                 case 8:
5228                         lcr1_brdr_value |= BIT5 + BIT4;
5229                         break;
5230                 case 4:
5231                         lcr1_brdr_value |= BIT5 + BIT3;
5232                         break;
5233                 case 0:
5234                         lcr1_brdr_value |= BIT5;
5235                         break;
5236                 }
5237
5238                 *LCR1BRDR = lcr1_brdr_value;
5239                 *MiscCtrl = misc_ctrl_value;
5240         }
5241
5242         sca_init(info->port_array[0]);
5243         sca_init(info->port_array[2]);
5244
5245         return true;
5246 }
5247
5248 /* Loopback an HDLC frame to test the hardware
5249  * interrupt and DMA functions.
5250  */
5251 static bool loopback_test(SLMP_INFO *info)
5252 {
5253 #define TESTFRAMESIZE 20
5254
5255         unsigned long timeout;
5256         u16 count = TESTFRAMESIZE;
5257         unsigned char buf[TESTFRAMESIZE];
5258         bool rc = false;
5259         unsigned long flags;
5260
5261         struct tty_struct *oldtty = info->port.tty;
5262         u32 speed = info->params.clock_speed;
5263
5264         info->params.clock_speed = 3686400;
5265         info->port.tty = NULL;
5266
5267         /* assume failure */
5268         info->init_error = DiagStatus_DmaFailure;
5269
5270         /* build and send transmit frame */
5271         for (count = 0; count < TESTFRAMESIZE;++count)
5272                 buf[count] = (unsigned char)count;
5273
5274         memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5275
5276         /* program hardware for HDLC and enabled receiver */
5277         spin_lock_irqsave(&info->lock,flags);
5278         hdlc_mode(info);
5279         enable_loopback(info,1);
5280         rx_start(info);
5281         info->tx_count = count;
5282         tx_load_dma_buffer(info,buf,count);
5283         tx_start(info);
5284         spin_unlock_irqrestore(&info->lock,flags);
5285
5286         /* wait for receive complete */
5287         /* Set a timeout for waiting for interrupt. */
5288         for ( timeout = 100; timeout; --timeout ) {
5289                 msleep_interruptible(10);
5290
5291                 if (rx_get_frame(info)) {
5292                         rc = true;
5293                         break;
5294                 }
5295         }
5296
5297         /* verify received frame length and contents */
5298         if (rc &&
5299             ( info->tmp_rx_buf_count != count ||
5300               memcmp(buf, info->tmp_rx_buf,count))) {
5301                 rc = false;
5302         }
5303
5304         spin_lock_irqsave(&info->lock,flags);
5305         reset_adapter(info);
5306         spin_unlock_irqrestore(&info->lock,flags);
5307
5308         info->params.clock_speed = speed;
5309         info->port.tty = oldtty;
5310
5311         return rc;
5312 }
5313
5314 /* Perform diagnostics on hardware
5315  */
5316 static int adapter_test( SLMP_INFO *info )
5317 {
5318         unsigned long flags;
5319         if ( debug_level >= DEBUG_LEVEL_INFO )
5320                 printk( "%s(%d):Testing device %s\n",
5321                         __FILE__,__LINE__,info->device_name );
5322
5323         spin_lock_irqsave(&info->lock,flags);
5324         init_adapter(info);
5325         spin_unlock_irqrestore(&info->lock,flags);
5326
5327         info->port_array[0]->port_count = 0;
5328
5329         if ( register_test(info->port_array[0]) &&
5330                 register_test(info->port_array[1])) {
5331
5332                 info->port_array[0]->port_count = 2;
5333
5334                 if ( register_test(info->port_array[2]) &&
5335                         register_test(info->port_array[3]) )
5336                         info->port_array[0]->port_count += 2;
5337         }
5338         else {
5339                 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5340                         __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5341                 return -ENODEV;
5342         }
5343
5344         if ( !irq_test(info->port_array[0]) ||
5345                 !irq_test(info->port_array[1]) ||
5346                  (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5347                  (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5348                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5349                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5350                 return -ENODEV;
5351         }
5352
5353         if (!loopback_test(info->port_array[0]) ||
5354                 !loopback_test(info->port_array[1]) ||
5355                  (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5356                  (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5357                 printk( "%s(%d):DMA test failure for device %s\n",
5358                         __FILE__,__LINE__,info->device_name);
5359                 return -ENODEV;
5360         }
5361
5362         if ( debug_level >= DEBUG_LEVEL_INFO )
5363                 printk( "%s(%d):device %s passed diagnostics\n",
5364                         __FILE__,__LINE__,info->device_name );
5365
5366         info->port_array[0]->init_error = 0;
5367         info->port_array[1]->init_error = 0;
5368         if ( info->port_count > 2 ) {
5369                 info->port_array[2]->init_error = 0;
5370                 info->port_array[3]->init_error = 0;
5371         }
5372
5373         return 0;
5374 }
5375
5376 /* Test the shared memory on a PCI adapter.
5377  */
5378 static bool memory_test(SLMP_INFO *info)
5379 {
5380         static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5381                 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5382         unsigned long count = ARRAY_SIZE(testval);
5383         unsigned long i;
5384         unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5385         unsigned long * addr = (unsigned long *)info->memory_base;
5386
5387         /* Test data lines with test pattern at one location. */
5388
5389         for ( i = 0 ; i < count ; i++ ) {
5390                 *addr = testval[i];
5391                 if ( *addr != testval[i] )
5392                         return false;
5393         }
5394
5395         /* Test address lines with incrementing pattern over */
5396         /* entire address range. */
5397
5398         for ( i = 0 ; i < limit ; i++ ) {
5399                 *addr = i * 4;
5400                 addr++;
5401         }
5402
5403         addr = (unsigned long *)info->memory_base;
5404
5405         for ( i = 0 ; i < limit ; i++ ) {
5406                 if ( *addr != i * 4 )
5407                         return false;
5408                 addr++;
5409         }
5410
5411         memset( info->memory_base, 0, SCA_MEM_SIZE );
5412         return true;
5413 }
5414
5415 /* Load data into PCI adapter shared memory.
5416  *
5417  * The PCI9050 releases control of the local bus
5418  * after completing the current read or write operation.
5419  *
5420  * While the PCI9050 write FIFO not empty, the
5421  * PCI9050 treats all of the writes as a single transaction
5422  * and does not release the bus. This causes DMA latency problems
5423  * at high speeds when copying large data blocks to the shared memory.
5424  *
5425  * This function breaks a write into multiple transations by
5426  * interleaving a read which flushes the write FIFO and 'completes'
5427  * the write transation. This allows any pending DMA request to gain control
5428  * of the local bus in a timely fasion.
5429  */
5430 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5431 {
5432         /* A load interval of 16 allows for 4 32-bit writes at */
5433         /* 136ns each for a maximum latency of 542ns on the local bus.*/
5434
5435         unsigned short interval = count / sca_pci_load_interval;
5436         unsigned short i;
5437
5438         for ( i = 0 ; i < interval ; i++ )
5439         {
5440                 memcpy(dest, src, sca_pci_load_interval);
5441                 read_status_reg(info);
5442                 dest += sca_pci_load_interval;
5443                 src += sca_pci_load_interval;
5444         }
5445
5446         memcpy(dest, src, count % sca_pci_load_interval);
5447 }
5448
5449 static void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5450 {
5451         int i;
5452         int linecount;
5453         if (xmit)
5454                 printk("%s tx data:\n",info->device_name);
5455         else
5456                 printk("%s rx data:\n",info->device_name);
5457
5458         while(count) {
5459                 if (count > 16)
5460                         linecount = 16;
5461                 else
5462                         linecount = count;
5463
5464                 for(i=0;i<linecount;i++)
5465                         printk("%02X ",(unsigned char)data[i]);
5466                 for(;i<17;i++)
5467                         printk("   ");
5468                 for(i=0;i<linecount;i++) {
5469                         if (data[i]>=040 && data[i]<=0176)
5470                                 printk("%c",data[i]);
5471                         else
5472                                 printk(".");
5473                 }
5474                 printk("\n");
5475
5476                 data  += linecount;
5477                 count -= linecount;
5478         }
5479 }       /* end of trace_block() */
5480
5481 /* called when HDLC frame times out
5482  * update stats and do tx completion processing
5483  */
5484 static void tx_timeout(unsigned long context)
5485 {
5486         SLMP_INFO *info = (SLMP_INFO*)context;
5487         unsigned long flags;
5488
5489         if ( debug_level >= DEBUG_LEVEL_INFO )
5490                 printk( "%s(%d):%s tx_timeout()\n",
5491                         __FILE__,__LINE__,info->device_name);
5492         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5493                 info->icount.txtimeout++;
5494         }
5495         spin_lock_irqsave(&info->lock,flags);
5496         info->tx_active = false;
5497         info->tx_count = info->tx_put = info->tx_get = 0;
5498
5499         spin_unlock_irqrestore(&info->lock,flags);
5500
5501 #if SYNCLINK_GENERIC_HDLC
5502         if (info->netcount)
5503                 hdlcdev_tx_done(info);
5504         else
5505 #endif
5506                 bh_transmit(info);
5507 }
5508
5509 /* called to periodically check the DSR/RI modem signal input status
5510  */
5511 static void status_timeout(unsigned long context)
5512 {
5513         u16 status = 0;
5514         SLMP_INFO *info = (SLMP_INFO*)context;
5515         unsigned long flags;
5516         unsigned char delta;
5517
5518
5519         spin_lock_irqsave(&info->lock,flags);
5520         get_signals(info);
5521         spin_unlock_irqrestore(&info->lock,flags);
5522
5523         /* check for DSR/RI state change */
5524
5525         delta = info->old_signals ^ info->serial_signals;
5526         info->old_signals = info->serial_signals;
5527
5528         if (delta & SerialSignal_DSR)
5529                 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5530
5531         if (delta & SerialSignal_RI)
5532                 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5533
5534         if (delta & SerialSignal_DCD)
5535                 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5536
5537         if (delta & SerialSignal_CTS)
5538                 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5539
5540         if (status)
5541                 isr_io_pin(info,status);
5542
5543         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
5544 }
5545
5546
5547 /* Register Access Routines -
5548  * All registers are memory mapped
5549  */
5550 #define CALC_REGADDR() \
5551         unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5552         if (info->port_num > 1) \
5553                 RegAddr += 256;                 /* port 0-1 SCA0, 2-3 SCA1 */ \
5554         if ( info->port_num & 1) { \
5555                 if (Addr > 0x7f) \
5556                         RegAddr += 0x40;        /* DMA access */ \
5557                 else if (Addr > 0x1f && Addr < 0x60) \
5558                         RegAddr += 0x20;        /* MSCI access */ \
5559         }
5560
5561
5562 static unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5563 {
5564         CALC_REGADDR();
5565         return *RegAddr;
5566 }
5567 static void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5568 {
5569         CALC_REGADDR();
5570         *RegAddr = Value;
5571 }
5572
5573 static u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5574 {
5575         CALC_REGADDR();
5576         return *((u16 *)RegAddr);
5577 }
5578
5579 static void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5580 {
5581         CALC_REGADDR();
5582         *((u16 *)RegAddr) = Value;
5583 }
5584
5585 static unsigned char read_status_reg(SLMP_INFO * info)
5586 {
5587         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5588         return *RegAddr;
5589 }
5590
5591 static void write_control_reg(SLMP_INFO * info)
5592 {
5593         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5594         *RegAddr = info->port_array[0]->ctrlreg_value;
5595 }
5596
5597
5598 static int __devinit synclinkmp_init_one (struct pci_dev *dev,
5599                                           const struct pci_device_id *ent)
5600 {
5601         if (pci_enable_device(dev)) {
5602                 printk("error enabling pci device %p\n", dev);
5603                 return -EIO;
5604         }
5605         device_init( ++synclinkmp_adapter_count, dev );
5606         return 0;
5607 }
5608
5609 static void __devexit synclinkmp_remove_one (struct pci_dev *dev)
5610 {
5611 }