TTY: call tty_port_destroy in the rest of drivers
[linux-3.10.git] / drivers / tty / synclink_gt.c
1 /*
2  * Device driver for Microgate SyncLink GT serial adapters.
3  *
4  * written by Paul Fulghum for Microgate Corporation
5  * paulkf@microgate.com
6  *
7  * Microgate and SyncLink are trademarks of Microgate Corporation
8  *
9  * This code is released under the GNU General Public License (GPL)
10  *
11  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
12  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
13  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
14  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
15  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
16  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
17  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
18  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
19  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
20  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
21  * OF THE POSSIBILITY OF SUCH DAMAGE.
22  */
23
24 /*
25  * DEBUG OUTPUT DEFINITIONS
26  *
27  * uncomment lines below to enable specific types of debug output
28  *
29  * DBGINFO   information - most verbose output
30  * DBGERR    serious errors
31  * DBGBH     bottom half service routine debugging
32  * DBGISR    interrupt service routine debugging
33  * DBGDATA   output receive and transmit data
34  * DBGTBUF   output transmit DMA buffers and registers
35  * DBGRBUF   output receive DMA buffers and registers
36  */
37
38 #define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
39 #define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
40 #define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
41 #define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
42 #define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
43 /*#define DBGTBUF(info) dump_tbufs(info)*/
44 /*#define DBGRBUF(info) dump_rbufs(info)*/
45
46
47 #include <linux/module.h>
48 #include <linux/errno.h>
49 #include <linux/signal.h>
50 #include <linux/sched.h>
51 #include <linux/timer.h>
52 #include <linux/interrupt.h>
53 #include <linux/pci.h>
54 #include <linux/tty.h>
55 #include <linux/tty_flip.h>
56 #include <linux/serial.h>
57 #include <linux/major.h>
58 #include <linux/string.h>
59 #include <linux/fcntl.h>
60 #include <linux/ptrace.h>
61 #include <linux/ioport.h>
62 #include <linux/mm.h>
63 #include <linux/seq_file.h>
64 #include <linux/slab.h>
65 #include <linux/netdevice.h>
66 #include <linux/vmalloc.h>
67 #include <linux/init.h>
68 #include <linux/delay.h>
69 #include <linux/ioctl.h>
70 #include <linux/termios.h>
71 #include <linux/bitops.h>
72 #include <linux/workqueue.h>
73 #include <linux/hdlc.h>
74 #include <linux/synclink.h>
75
76 #include <asm/io.h>
77 #include <asm/irq.h>
78 #include <asm/dma.h>
79 #include <asm/types.h>
80 #include <asm/uaccess.h>
81
82 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
83 #define SYNCLINK_GENERIC_HDLC 1
84 #else
85 #define SYNCLINK_GENERIC_HDLC 0
86 #endif
87
88 /*
89  * module identification
90  */
91 static char *driver_name     = "SyncLink GT";
92 static char *tty_driver_name = "synclink_gt";
93 static char *tty_dev_prefix  = "ttySLG";
94 MODULE_LICENSE("GPL");
95 #define MGSL_MAGIC 0x5401
96 #define MAX_DEVICES 32
97
98 static struct pci_device_id pci_table[] = {
99         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
100         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
101         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
102         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
103         {0,}, /* terminate list */
104 };
105 MODULE_DEVICE_TABLE(pci, pci_table);
106
107 static int  init_one(struct pci_dev *dev,const struct pci_device_id *ent);
108 static void remove_one(struct pci_dev *dev);
109 static struct pci_driver pci_driver = {
110         .name           = "synclink_gt",
111         .id_table       = pci_table,
112         .probe          = init_one,
113         .remove         = __devexit_p(remove_one),
114 };
115
116 static bool pci_registered;
117
118 /*
119  * module configuration and status
120  */
121 static struct slgt_info *slgt_device_list;
122 static int slgt_device_count;
123
124 static int ttymajor;
125 static int debug_level;
126 static int maxframe[MAX_DEVICES];
127
128 module_param(ttymajor, int, 0);
129 module_param(debug_level, int, 0);
130 module_param_array(maxframe, int, NULL, 0);
131
132 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
133 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
134 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
135
136 /*
137  * tty support and callbacks
138  */
139 static struct tty_driver *serial_driver;
140
141 static int  open(struct tty_struct *tty, struct file * filp);
142 static void close(struct tty_struct *tty, struct file * filp);
143 static void hangup(struct tty_struct *tty);
144 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
145
146 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
147 static int put_char(struct tty_struct *tty, unsigned char ch);
148 static void send_xchar(struct tty_struct *tty, char ch);
149 static void wait_until_sent(struct tty_struct *tty, int timeout);
150 static int  write_room(struct tty_struct *tty);
151 static void flush_chars(struct tty_struct *tty);
152 static void flush_buffer(struct tty_struct *tty);
153 static void tx_hold(struct tty_struct *tty);
154 static void tx_release(struct tty_struct *tty);
155
156 static int  ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
157 static int  chars_in_buffer(struct tty_struct *tty);
158 static void throttle(struct tty_struct * tty);
159 static void unthrottle(struct tty_struct * tty);
160 static int set_break(struct tty_struct *tty, int break_state);
161
162 /*
163  * generic HDLC support and callbacks
164  */
165 #if SYNCLINK_GENERIC_HDLC
166 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
167 static void hdlcdev_tx_done(struct slgt_info *info);
168 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
169 static int  hdlcdev_init(struct slgt_info *info);
170 static void hdlcdev_exit(struct slgt_info *info);
171 #endif
172
173
174 /*
175  * device specific structures, macros and functions
176  */
177
178 #define SLGT_MAX_PORTS 4
179 #define SLGT_REG_SIZE  256
180
181 /*
182  * conditional wait facility
183  */
184 struct cond_wait {
185         struct cond_wait *next;
186         wait_queue_head_t q;
187         wait_queue_t wait;
188         unsigned int data;
189 };
190 static void init_cond_wait(struct cond_wait *w, unsigned int data);
191 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
192 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
193 static void flush_cond_wait(struct cond_wait **head);
194
195 /*
196  * DMA buffer descriptor and access macros
197  */
198 struct slgt_desc
199 {
200         __le16 count;
201         __le16 status;
202         __le32 pbuf;  /* physical address of data buffer */
203         __le32 next;  /* physical address of next descriptor */
204
205         /* driver book keeping */
206         char *buf;          /* virtual  address of data buffer */
207         unsigned int pdesc; /* physical address of this descriptor */
208         dma_addr_t buf_dma_addr;
209         unsigned short buf_count;
210 };
211
212 #define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
213 #define set_desc_next(a,b) (a).next   = cpu_to_le32((unsigned int)(b))
214 #define set_desc_count(a,b)(a).count  = cpu_to_le16((unsigned short)(b))
215 #define set_desc_eof(a,b)  (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
216 #define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b))
217 #define desc_count(a)      (le16_to_cpu((a).count))
218 #define desc_status(a)     (le16_to_cpu((a).status))
219 #define desc_complete(a)   (le16_to_cpu((a).status) & BIT15)
220 #define desc_eof(a)        (le16_to_cpu((a).status) & BIT2)
221 #define desc_crc_error(a)  (le16_to_cpu((a).status) & BIT1)
222 #define desc_abort(a)      (le16_to_cpu((a).status) & BIT0)
223 #define desc_residue(a)    ((le16_to_cpu((a).status) & 0x38) >> 3)
224
225 struct _input_signal_events {
226         int ri_up;
227         int ri_down;
228         int dsr_up;
229         int dsr_down;
230         int dcd_up;
231         int dcd_down;
232         int cts_up;
233         int cts_down;
234 };
235
236 /*
237  * device instance data structure
238  */
239 struct slgt_info {
240         void *if_ptr;           /* General purpose pointer (used by SPPP) */
241         struct tty_port port;
242
243         struct slgt_info *next_device;  /* device list link */
244
245         int magic;
246
247         char device_name[25];
248         struct pci_dev *pdev;
249
250         int port_count;  /* count of ports on adapter */
251         int adapter_num; /* adapter instance number */
252         int port_num;    /* port instance number */
253
254         /* array of pointers to port contexts on this adapter */
255         struct slgt_info *port_array[SLGT_MAX_PORTS];
256
257         int                     line;           /* tty line instance number */
258
259         struct mgsl_icount      icount;
260
261         int                     timeout;
262         int                     x_char;         /* xon/xoff character */
263         unsigned int            read_status_mask;
264         unsigned int            ignore_status_mask;
265
266         wait_queue_head_t       status_event_wait_q;
267         wait_queue_head_t       event_wait_q;
268         struct timer_list       tx_timer;
269         struct timer_list       rx_timer;
270
271         unsigned int            gpio_present;
272         struct cond_wait        *gpio_wait_q;
273
274         spinlock_t lock;        /* spinlock for synchronizing with ISR */
275
276         struct work_struct task;
277         u32 pending_bh;
278         bool bh_requested;
279         bool bh_running;
280
281         int isr_overflow;
282         bool irq_requested;     /* true if IRQ requested */
283         bool irq_occurred;      /* for diagnostics use */
284
285         /* device configuration */
286
287         unsigned int bus_type;
288         unsigned int irq_level;
289         unsigned long irq_flags;
290
291         unsigned char __iomem * reg_addr;  /* memory mapped registers address */
292         u32 phys_reg_addr;
293         bool reg_addr_requested;
294
295         MGSL_PARAMS params;       /* communications parameters */
296         u32 idle_mode;
297         u32 max_frame_size;       /* as set by device config */
298
299         unsigned int rbuf_fill_level;
300         unsigned int rx_pio;
301         unsigned int if_mode;
302         unsigned int base_clock;
303         unsigned int xsync;
304         unsigned int xctrl;
305
306         /* device status */
307
308         bool rx_enabled;
309         bool rx_restart;
310
311         bool tx_enabled;
312         bool tx_active;
313
314         unsigned char signals;    /* serial signal states */
315         int init_error;  /* initialization error */
316
317         unsigned char *tx_buf;
318         int tx_count;
319
320         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
321         char char_buf[MAX_ASYNC_BUFFER_SIZE];
322         bool drop_rts_on_tx_done;
323         struct  _input_signal_events    input_signal_events;
324
325         int dcd_chkcount;       /* check counts to prevent */
326         int cts_chkcount;       /* too many IRQs if a signal */
327         int dsr_chkcount;       /* is floating */
328         int ri_chkcount;
329
330         char *bufs;             /* virtual address of DMA buffer lists */
331         dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
332
333         unsigned int rbuf_count;
334         struct slgt_desc *rbufs;
335         unsigned int rbuf_current;
336         unsigned int rbuf_index;
337         unsigned int rbuf_fill_index;
338         unsigned short rbuf_fill_count;
339
340         unsigned int tbuf_count;
341         struct slgt_desc *tbufs;
342         unsigned int tbuf_current;
343         unsigned int tbuf_start;
344
345         unsigned char *tmp_rbuf;
346         unsigned int tmp_rbuf_count;
347
348         /* SPPP/Cisco HDLC device parts */
349
350         int netcount;
351         spinlock_t netlock;
352 #if SYNCLINK_GENERIC_HDLC
353         struct net_device *netdev;
354 #endif
355
356 };
357
358 static MGSL_PARAMS default_params = {
359         .mode            = MGSL_MODE_HDLC,
360         .loopback        = 0,
361         .flags           = HDLC_FLAG_UNDERRUN_ABORT15,
362         .encoding        = HDLC_ENCODING_NRZI_SPACE,
363         .clock_speed     = 0,
364         .addr_filter     = 0xff,
365         .crc_type        = HDLC_CRC_16_CCITT,
366         .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
367         .preamble        = HDLC_PREAMBLE_PATTERN_NONE,
368         .data_rate       = 9600,
369         .data_bits       = 8,
370         .stop_bits       = 1,
371         .parity          = ASYNC_PARITY_NONE
372 };
373
374
375 #define BH_RECEIVE  1
376 #define BH_TRANSMIT 2
377 #define BH_STATUS   4
378 #define IO_PIN_SHUTDOWN_LIMIT 100
379
380 #define DMABUFSIZE 256
381 #define DESC_LIST_SIZE 4096
382
383 #define MASK_PARITY  BIT1
384 #define MASK_FRAMING BIT0
385 #define MASK_BREAK   BIT14
386 #define MASK_OVERRUN BIT4
387
388 #define GSR   0x00 /* global status */
389 #define JCR   0x04 /* JTAG control */
390 #define IODR  0x08 /* GPIO direction */
391 #define IOER  0x0c /* GPIO interrupt enable */
392 #define IOVR  0x10 /* GPIO value */
393 #define IOSR  0x14 /* GPIO interrupt status */
394 #define TDR   0x80 /* tx data */
395 #define RDR   0x80 /* rx data */
396 #define TCR   0x82 /* tx control */
397 #define TIR   0x84 /* tx idle */
398 #define TPR   0x85 /* tx preamble */
399 #define RCR   0x86 /* rx control */
400 #define VCR   0x88 /* V.24 control */
401 #define CCR   0x89 /* clock control */
402 #define BDR   0x8a /* baud divisor */
403 #define SCR   0x8c /* serial control */
404 #define SSR   0x8e /* serial status */
405 #define RDCSR 0x90 /* rx DMA control/status */
406 #define TDCSR 0x94 /* tx DMA control/status */
407 #define RDDAR 0x98 /* rx DMA descriptor address */
408 #define TDDAR 0x9c /* tx DMA descriptor address */
409 #define XSR   0x40 /* extended sync pattern */
410 #define XCR   0x44 /* extended control */
411
412 #define RXIDLE      BIT14
413 #define RXBREAK     BIT14
414 #define IRQ_TXDATA  BIT13
415 #define IRQ_TXIDLE  BIT12
416 #define IRQ_TXUNDER BIT11 /* HDLC */
417 #define IRQ_RXDATA  BIT10
418 #define IRQ_RXIDLE  BIT9  /* HDLC */
419 #define IRQ_RXBREAK BIT9  /* async */
420 #define IRQ_RXOVER  BIT8
421 #define IRQ_DSR     BIT7
422 #define IRQ_CTS     BIT6
423 #define IRQ_DCD     BIT5
424 #define IRQ_RI      BIT4
425 #define IRQ_ALL     0x3ff0
426 #define IRQ_MASTER  BIT0
427
428 #define slgt_irq_on(info, mask) \
429         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
430 #define slgt_irq_off(info, mask) \
431         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
432
433 static __u8  rd_reg8(struct slgt_info *info, unsigned int addr);
434 static void  wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
435 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
436 static void  wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
437 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
438 static void  wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
439
440 static void  msc_set_vcr(struct slgt_info *info);
441
442 static int  startup(struct slgt_info *info);
443 static int  block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
444 static void shutdown(struct slgt_info *info);
445 static void program_hw(struct slgt_info *info);
446 static void change_params(struct slgt_info *info);
447
448 static int  register_test(struct slgt_info *info);
449 static int  irq_test(struct slgt_info *info);
450 static int  loopback_test(struct slgt_info *info);
451 static int  adapter_test(struct slgt_info *info);
452
453 static void reset_adapter(struct slgt_info *info);
454 static void reset_port(struct slgt_info *info);
455 static void async_mode(struct slgt_info *info);
456 static void sync_mode(struct slgt_info *info);
457
458 static void rx_stop(struct slgt_info *info);
459 static void rx_start(struct slgt_info *info);
460 static void reset_rbufs(struct slgt_info *info);
461 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
462 static void rdma_reset(struct slgt_info *info);
463 static bool rx_get_frame(struct slgt_info *info);
464 static bool rx_get_buf(struct slgt_info *info);
465
466 static void tx_start(struct slgt_info *info);
467 static void tx_stop(struct slgt_info *info);
468 static void tx_set_idle(struct slgt_info *info);
469 static unsigned int free_tbuf_count(struct slgt_info *info);
470 static unsigned int tbuf_bytes(struct slgt_info *info);
471 static void reset_tbufs(struct slgt_info *info);
472 static void tdma_reset(struct slgt_info *info);
473 static bool tx_load(struct slgt_info *info, const char *buf, unsigned int count);
474
475 static void get_signals(struct slgt_info *info);
476 static void set_signals(struct slgt_info *info);
477 static void enable_loopback(struct slgt_info *info);
478 static void set_rate(struct slgt_info *info, u32 data_rate);
479
480 static int  bh_action(struct slgt_info *info);
481 static void bh_handler(struct work_struct *work);
482 static void bh_transmit(struct slgt_info *info);
483 static void isr_serial(struct slgt_info *info);
484 static void isr_rdma(struct slgt_info *info);
485 static void isr_txeom(struct slgt_info *info, unsigned short status);
486 static void isr_tdma(struct slgt_info *info);
487
488 static int  alloc_dma_bufs(struct slgt_info *info);
489 static void free_dma_bufs(struct slgt_info *info);
490 static int  alloc_desc(struct slgt_info *info);
491 static void free_desc(struct slgt_info *info);
492 static int  alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
493 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
494
495 static int  alloc_tmp_rbuf(struct slgt_info *info);
496 static void free_tmp_rbuf(struct slgt_info *info);
497
498 static void tx_timeout(unsigned long context);
499 static void rx_timeout(unsigned long context);
500
501 /*
502  * ioctl handlers
503  */
504 static int  get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
505 static int  get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
506 static int  set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
507 static int  get_txidle(struct slgt_info *info, int __user *idle_mode);
508 static int  set_txidle(struct slgt_info *info, int idle_mode);
509 static int  tx_enable(struct slgt_info *info, int enable);
510 static int  tx_abort(struct slgt_info *info);
511 static int  rx_enable(struct slgt_info *info, int enable);
512 static int  modem_input_wait(struct slgt_info *info,int arg);
513 static int  wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
514 static int  tiocmget(struct tty_struct *tty);
515 static int  tiocmset(struct tty_struct *tty,
516                                 unsigned int set, unsigned int clear);
517 static int set_break(struct tty_struct *tty, int break_state);
518 static int  get_interface(struct slgt_info *info, int __user *if_mode);
519 static int  set_interface(struct slgt_info *info, int if_mode);
520 static int  set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
521 static int  get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
522 static int  wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
523 static int  get_xsync(struct slgt_info *info, int __user *if_mode);
524 static int  set_xsync(struct slgt_info *info, int if_mode);
525 static int  get_xctrl(struct slgt_info *info, int __user *if_mode);
526 static int  set_xctrl(struct slgt_info *info, int if_mode);
527
528 /*
529  * driver functions
530  */
531 static void add_device(struct slgt_info *info);
532 static void device_init(int adapter_num, struct pci_dev *pdev);
533 static int  claim_resources(struct slgt_info *info);
534 static void release_resources(struct slgt_info *info);
535
536 /*
537  * DEBUG OUTPUT CODE
538  */
539 #ifndef DBGINFO
540 #define DBGINFO(fmt)
541 #endif
542 #ifndef DBGERR
543 #define DBGERR(fmt)
544 #endif
545 #ifndef DBGBH
546 #define DBGBH(fmt)
547 #endif
548 #ifndef DBGISR
549 #define DBGISR(fmt)
550 #endif
551
552 #ifdef DBGDATA
553 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
554 {
555         int i;
556         int linecount;
557         printk("%s %s data:\n",info->device_name, label);
558         while(count) {
559                 linecount = (count > 16) ? 16 : count;
560                 for(i=0; i < linecount; i++)
561                         printk("%02X ",(unsigned char)data[i]);
562                 for(;i<17;i++)
563                         printk("   ");
564                 for(i=0;i<linecount;i++) {
565                         if (data[i]>=040 && data[i]<=0176)
566                                 printk("%c",data[i]);
567                         else
568                                 printk(".");
569                 }
570                 printk("\n");
571                 data  += linecount;
572                 count -= linecount;
573         }
574 }
575 #else
576 #define DBGDATA(info, buf, size, label)
577 #endif
578
579 #ifdef DBGTBUF
580 static void dump_tbufs(struct slgt_info *info)
581 {
582         int i;
583         printk("tbuf_current=%d\n", info->tbuf_current);
584         for (i=0 ; i < info->tbuf_count ; i++) {
585                 printk("%d: count=%04X status=%04X\n",
586                         i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
587         }
588 }
589 #else
590 #define DBGTBUF(info)
591 #endif
592
593 #ifdef DBGRBUF
594 static void dump_rbufs(struct slgt_info *info)
595 {
596         int i;
597         printk("rbuf_current=%d\n", info->rbuf_current);
598         for (i=0 ; i < info->rbuf_count ; i++) {
599                 printk("%d: count=%04X status=%04X\n",
600                         i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
601         }
602 }
603 #else
604 #define DBGRBUF(info)
605 #endif
606
607 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
608 {
609 #ifdef SANITY_CHECK
610         if (!info) {
611                 printk("null struct slgt_info for (%s) in %s\n", devname, name);
612                 return 1;
613         }
614         if (info->magic != MGSL_MAGIC) {
615                 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
616                 return 1;
617         }
618 #else
619         if (!info)
620                 return 1;
621 #endif
622         return 0;
623 }
624
625 /**
626  * line discipline callback wrappers
627  *
628  * The wrappers maintain line discipline references
629  * while calling into the line discipline.
630  *
631  * ldisc_receive_buf  - pass receive data to line discipline
632  */
633 static void ldisc_receive_buf(struct tty_struct *tty,
634                               const __u8 *data, char *flags, int count)
635 {
636         struct tty_ldisc *ld;
637         if (!tty)
638                 return;
639         ld = tty_ldisc_ref(tty);
640         if (ld) {
641                 if (ld->ops->receive_buf)
642                         ld->ops->receive_buf(tty, data, flags, count);
643                 tty_ldisc_deref(ld);
644         }
645 }
646
647 /* tty callbacks */
648
649 static int open(struct tty_struct *tty, struct file *filp)
650 {
651         struct slgt_info *info;
652         int retval, line;
653         unsigned long flags;
654
655         line = tty->index;
656         if (line >= slgt_device_count) {
657                 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
658                 return -ENODEV;
659         }
660
661         info = slgt_device_list;
662         while(info && info->line != line)
663                 info = info->next_device;
664         if (sanity_check(info, tty->name, "open"))
665                 return -ENODEV;
666         if (info->init_error) {
667                 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
668                 return -ENODEV;
669         }
670
671         tty->driver_data = info;
672         info->port.tty = tty;
673
674         DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
675
676         /* If port is closing, signal caller to try again */
677         if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
678                 if (info->port.flags & ASYNC_CLOSING)
679                         interruptible_sleep_on(&info->port.close_wait);
680                 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
681                         -EAGAIN : -ERESTARTSYS);
682                 goto cleanup;
683         }
684
685         mutex_lock(&info->port.mutex);
686         info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
687
688         spin_lock_irqsave(&info->netlock, flags);
689         if (info->netcount) {
690                 retval = -EBUSY;
691                 spin_unlock_irqrestore(&info->netlock, flags);
692                 mutex_unlock(&info->port.mutex);
693                 goto cleanup;
694         }
695         info->port.count++;
696         spin_unlock_irqrestore(&info->netlock, flags);
697
698         if (info->port.count == 1) {
699                 /* 1st open on this device, init hardware */
700                 retval = startup(info);
701                 if (retval < 0) {
702                         mutex_unlock(&info->port.mutex);
703                         goto cleanup;
704                 }
705         }
706         mutex_unlock(&info->port.mutex);
707         retval = block_til_ready(tty, filp, info);
708         if (retval) {
709                 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
710                 goto cleanup;
711         }
712
713         retval = 0;
714
715 cleanup:
716         if (retval) {
717                 if (tty->count == 1)
718                         info->port.tty = NULL; /* tty layer will release tty struct */
719                 if(info->port.count)
720                         info->port.count--;
721         }
722
723         DBGINFO(("%s open rc=%d\n", info->device_name, retval));
724         return retval;
725 }
726
727 static void close(struct tty_struct *tty, struct file *filp)
728 {
729         struct slgt_info *info = tty->driver_data;
730
731         if (sanity_check(info, tty->name, "close"))
732                 return;
733         DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
734
735         if (tty_port_close_start(&info->port, tty, filp) == 0)
736                 goto cleanup;
737
738         mutex_lock(&info->port.mutex);
739         if (info->port.flags & ASYNC_INITIALIZED)
740                 wait_until_sent(tty, info->timeout);
741         flush_buffer(tty);
742         tty_ldisc_flush(tty);
743
744         shutdown(info);
745         mutex_unlock(&info->port.mutex);
746
747         tty_port_close_end(&info->port, tty);
748         info->port.tty = NULL;
749 cleanup:
750         DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
751 }
752
753 static void hangup(struct tty_struct *tty)
754 {
755         struct slgt_info *info = tty->driver_data;
756         unsigned long flags;
757
758         if (sanity_check(info, tty->name, "hangup"))
759                 return;
760         DBGINFO(("%s hangup\n", info->device_name));
761
762         flush_buffer(tty);
763
764         mutex_lock(&info->port.mutex);
765         shutdown(info);
766
767         spin_lock_irqsave(&info->port.lock, flags);
768         info->port.count = 0;
769         info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
770         info->port.tty = NULL;
771         spin_unlock_irqrestore(&info->port.lock, flags);
772         mutex_unlock(&info->port.mutex);
773
774         wake_up_interruptible(&info->port.open_wait);
775 }
776
777 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
778 {
779         struct slgt_info *info = tty->driver_data;
780         unsigned long flags;
781
782         DBGINFO(("%s set_termios\n", tty->driver->name));
783
784         change_params(info);
785
786         /* Handle transition to B0 status */
787         if (old_termios->c_cflag & CBAUD &&
788             !(tty->termios.c_cflag & CBAUD)) {
789                 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
790                 spin_lock_irqsave(&info->lock,flags);
791                 set_signals(info);
792                 spin_unlock_irqrestore(&info->lock,flags);
793         }
794
795         /* Handle transition away from B0 status */
796         if (!(old_termios->c_cflag & CBAUD) &&
797             tty->termios.c_cflag & CBAUD) {
798                 info->signals |= SerialSignal_DTR;
799                 if (!(tty->termios.c_cflag & CRTSCTS) ||
800                     !test_bit(TTY_THROTTLED, &tty->flags)) {
801                         info->signals |= SerialSignal_RTS;
802                 }
803                 spin_lock_irqsave(&info->lock,flags);
804                 set_signals(info);
805                 spin_unlock_irqrestore(&info->lock,flags);
806         }
807
808         /* Handle turning off CRTSCTS */
809         if (old_termios->c_cflag & CRTSCTS &&
810             !(tty->termios.c_cflag & CRTSCTS)) {
811                 tty->hw_stopped = 0;
812                 tx_release(tty);
813         }
814 }
815
816 static void update_tx_timer(struct slgt_info *info)
817 {
818         /*
819          * use worst case speed of 1200bps to calculate transmit timeout
820          * based on data in buffers (tbuf_bytes) and FIFO (128 bytes)
821          */
822         if (info->params.mode == MGSL_MODE_HDLC) {
823                 int timeout  = (tbuf_bytes(info) * 7) + 1000;
824                 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(timeout));
825         }
826 }
827
828 static int write(struct tty_struct *tty,
829                  const unsigned char *buf, int count)
830 {
831         int ret = 0;
832         struct slgt_info *info = tty->driver_data;
833         unsigned long flags;
834
835         if (sanity_check(info, tty->name, "write"))
836                 return -EIO;
837
838         DBGINFO(("%s write count=%d\n", info->device_name, count));
839
840         if (!info->tx_buf || (count > info->max_frame_size))
841                 return -EIO;
842
843         if (!count || tty->stopped || tty->hw_stopped)
844                 return 0;
845
846         spin_lock_irqsave(&info->lock, flags);
847
848         if (info->tx_count) {
849                 /* send accumulated data from send_char() */
850                 if (!tx_load(info, info->tx_buf, info->tx_count))
851                         goto cleanup;
852                 info->tx_count = 0;
853         }
854
855         if (tx_load(info, buf, count))
856                 ret = count;
857
858 cleanup:
859         spin_unlock_irqrestore(&info->lock, flags);
860         DBGINFO(("%s write rc=%d\n", info->device_name, ret));
861         return ret;
862 }
863
864 static int put_char(struct tty_struct *tty, unsigned char ch)
865 {
866         struct slgt_info *info = tty->driver_data;
867         unsigned long flags;
868         int ret = 0;
869
870         if (sanity_check(info, tty->name, "put_char"))
871                 return 0;
872         DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
873         if (!info->tx_buf)
874                 return 0;
875         spin_lock_irqsave(&info->lock,flags);
876         if (info->tx_count < info->max_frame_size) {
877                 info->tx_buf[info->tx_count++] = ch;
878                 ret = 1;
879         }
880         spin_unlock_irqrestore(&info->lock,flags);
881         return ret;
882 }
883
884 static void send_xchar(struct tty_struct *tty, char ch)
885 {
886         struct slgt_info *info = tty->driver_data;
887         unsigned long flags;
888
889         if (sanity_check(info, tty->name, "send_xchar"))
890                 return;
891         DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
892         info->x_char = ch;
893         if (ch) {
894                 spin_lock_irqsave(&info->lock,flags);
895                 if (!info->tx_enabled)
896                         tx_start(info);
897                 spin_unlock_irqrestore(&info->lock,flags);
898         }
899 }
900
901 static void wait_until_sent(struct tty_struct *tty, int timeout)
902 {
903         struct slgt_info *info = tty->driver_data;
904         unsigned long orig_jiffies, char_time;
905
906         if (!info )
907                 return;
908         if (sanity_check(info, tty->name, "wait_until_sent"))
909                 return;
910         DBGINFO(("%s wait_until_sent entry\n", info->device_name));
911         if (!(info->port.flags & ASYNC_INITIALIZED))
912                 goto exit;
913
914         orig_jiffies = jiffies;
915
916         /* Set check interval to 1/5 of estimated time to
917          * send a character, and make it at least 1. The check
918          * interval should also be less than the timeout.
919          * Note: use tight timings here to satisfy the NIST-PCTS.
920          */
921
922         if (info->params.data_rate) {
923                 char_time = info->timeout/(32 * 5);
924                 if (!char_time)
925                         char_time++;
926         } else
927                 char_time = 1;
928
929         if (timeout)
930                 char_time = min_t(unsigned long, char_time, timeout);
931
932         while (info->tx_active) {
933                 msleep_interruptible(jiffies_to_msecs(char_time));
934                 if (signal_pending(current))
935                         break;
936                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
937                         break;
938         }
939 exit:
940         DBGINFO(("%s wait_until_sent exit\n", info->device_name));
941 }
942
943 static int write_room(struct tty_struct *tty)
944 {
945         struct slgt_info *info = tty->driver_data;
946         int ret;
947
948         if (sanity_check(info, tty->name, "write_room"))
949                 return 0;
950         ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
951         DBGINFO(("%s write_room=%d\n", info->device_name, ret));
952         return ret;
953 }
954
955 static void flush_chars(struct tty_struct *tty)
956 {
957         struct slgt_info *info = tty->driver_data;
958         unsigned long flags;
959
960         if (sanity_check(info, tty->name, "flush_chars"))
961                 return;
962         DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
963
964         if (info->tx_count <= 0 || tty->stopped ||
965             tty->hw_stopped || !info->tx_buf)
966                 return;
967
968         DBGINFO(("%s flush_chars start transmit\n", info->device_name));
969
970         spin_lock_irqsave(&info->lock,flags);
971         if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
972                 info->tx_count = 0;
973         spin_unlock_irqrestore(&info->lock,flags);
974 }
975
976 static void flush_buffer(struct tty_struct *tty)
977 {
978         struct slgt_info *info = tty->driver_data;
979         unsigned long flags;
980
981         if (sanity_check(info, tty->name, "flush_buffer"))
982                 return;
983         DBGINFO(("%s flush_buffer\n", info->device_name));
984
985         spin_lock_irqsave(&info->lock, flags);
986         info->tx_count = 0;
987         spin_unlock_irqrestore(&info->lock, flags);
988
989         tty_wakeup(tty);
990 }
991
992 /*
993  * throttle (stop) transmitter
994  */
995 static void tx_hold(struct tty_struct *tty)
996 {
997         struct slgt_info *info = tty->driver_data;
998         unsigned long flags;
999
1000         if (sanity_check(info, tty->name, "tx_hold"))
1001                 return;
1002         DBGINFO(("%s tx_hold\n", info->device_name));
1003         spin_lock_irqsave(&info->lock,flags);
1004         if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
1005                 tx_stop(info);
1006         spin_unlock_irqrestore(&info->lock,flags);
1007 }
1008
1009 /*
1010  * release (start) transmitter
1011  */
1012 static void tx_release(struct tty_struct *tty)
1013 {
1014         struct slgt_info *info = tty->driver_data;
1015         unsigned long flags;
1016
1017         if (sanity_check(info, tty->name, "tx_release"))
1018                 return;
1019         DBGINFO(("%s tx_release\n", info->device_name));
1020         spin_lock_irqsave(&info->lock, flags);
1021         if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
1022                 info->tx_count = 0;
1023         spin_unlock_irqrestore(&info->lock, flags);
1024 }
1025
1026 /*
1027  * Service an IOCTL request
1028  *
1029  * Arguments
1030  *
1031  *      tty     pointer to tty instance data
1032  *      cmd     IOCTL command code
1033  *      arg     command argument/context
1034  *
1035  * Return 0 if success, otherwise error code
1036  */
1037 static int ioctl(struct tty_struct *tty,
1038                  unsigned int cmd, unsigned long arg)
1039 {
1040         struct slgt_info *info = tty->driver_data;
1041         void __user *argp = (void __user *)arg;
1042         int ret;
1043
1044         if (sanity_check(info, tty->name, "ioctl"))
1045                 return -ENODEV;
1046         DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1047
1048         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1049             (cmd != TIOCMIWAIT)) {
1050                 if (tty->flags & (1 << TTY_IO_ERROR))
1051                     return -EIO;
1052         }
1053
1054         switch (cmd) {
1055         case MGSL_IOCWAITEVENT:
1056                 return wait_mgsl_event(info, argp);
1057         case TIOCMIWAIT:
1058                 return modem_input_wait(info,(int)arg);
1059         case MGSL_IOCSGPIO:
1060                 return set_gpio(info, argp);
1061         case MGSL_IOCGGPIO:
1062                 return get_gpio(info, argp);
1063         case MGSL_IOCWAITGPIO:
1064                 return wait_gpio(info, argp);
1065         case MGSL_IOCGXSYNC:
1066                 return get_xsync(info, argp);
1067         case MGSL_IOCSXSYNC:
1068                 return set_xsync(info, (int)arg);
1069         case MGSL_IOCGXCTRL:
1070                 return get_xctrl(info, argp);
1071         case MGSL_IOCSXCTRL:
1072                 return set_xctrl(info, (int)arg);
1073         }
1074         mutex_lock(&info->port.mutex);
1075         switch (cmd) {
1076         case MGSL_IOCGPARAMS:
1077                 ret = get_params(info, argp);
1078                 break;
1079         case MGSL_IOCSPARAMS:
1080                 ret = set_params(info, argp);
1081                 break;
1082         case MGSL_IOCGTXIDLE:
1083                 ret = get_txidle(info, argp);
1084                 break;
1085         case MGSL_IOCSTXIDLE:
1086                 ret = set_txidle(info, (int)arg);
1087                 break;
1088         case MGSL_IOCTXENABLE:
1089                 ret = tx_enable(info, (int)arg);
1090                 break;
1091         case MGSL_IOCRXENABLE:
1092                 ret = rx_enable(info, (int)arg);
1093                 break;
1094         case MGSL_IOCTXABORT:
1095                 ret = tx_abort(info);
1096                 break;
1097         case MGSL_IOCGSTATS:
1098                 ret = get_stats(info, argp);
1099                 break;
1100         case MGSL_IOCGIF:
1101                 ret = get_interface(info, argp);
1102                 break;
1103         case MGSL_IOCSIF:
1104                 ret = set_interface(info,(int)arg);
1105                 break;
1106         default:
1107                 ret = -ENOIOCTLCMD;
1108         }
1109         mutex_unlock(&info->port.mutex);
1110         return ret;
1111 }
1112
1113 static int get_icount(struct tty_struct *tty,
1114                                 struct serial_icounter_struct *icount)
1115
1116 {
1117         struct slgt_info *info = tty->driver_data;
1118         struct mgsl_icount cnow;        /* kernel counter temps */
1119         unsigned long flags;
1120
1121         spin_lock_irqsave(&info->lock,flags);
1122         cnow = info->icount;
1123         spin_unlock_irqrestore(&info->lock,flags);
1124
1125         icount->cts = cnow.cts;
1126         icount->dsr = cnow.dsr;
1127         icount->rng = cnow.rng;
1128         icount->dcd = cnow.dcd;
1129         icount->rx = cnow.rx;
1130         icount->tx = cnow.tx;
1131         icount->frame = cnow.frame;
1132         icount->overrun = cnow.overrun;
1133         icount->parity = cnow.parity;
1134         icount->brk = cnow.brk;
1135         icount->buf_overrun = cnow.buf_overrun;
1136
1137         return 0;
1138 }
1139
1140 /*
1141  * support for 32 bit ioctl calls on 64 bit systems
1142  */
1143 #ifdef CONFIG_COMPAT
1144 static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1145 {
1146         struct MGSL_PARAMS32 tmp_params;
1147
1148         DBGINFO(("%s get_params32\n", info->device_name));
1149         memset(&tmp_params, 0, sizeof(tmp_params));
1150         tmp_params.mode            = (compat_ulong_t)info->params.mode;
1151         tmp_params.loopback        = info->params.loopback;
1152         tmp_params.flags           = info->params.flags;
1153         tmp_params.encoding        = info->params.encoding;
1154         tmp_params.clock_speed     = (compat_ulong_t)info->params.clock_speed;
1155         tmp_params.addr_filter     = info->params.addr_filter;
1156         tmp_params.crc_type        = info->params.crc_type;
1157         tmp_params.preamble_length = info->params.preamble_length;
1158         tmp_params.preamble        = info->params.preamble;
1159         tmp_params.data_rate       = (compat_ulong_t)info->params.data_rate;
1160         tmp_params.data_bits       = info->params.data_bits;
1161         tmp_params.stop_bits       = info->params.stop_bits;
1162         tmp_params.parity          = info->params.parity;
1163         if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1164                 return -EFAULT;
1165         return 0;
1166 }
1167
1168 static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1169 {
1170         struct MGSL_PARAMS32 tmp_params;
1171
1172         DBGINFO(("%s set_params32\n", info->device_name));
1173         if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1174                 return -EFAULT;
1175
1176         spin_lock(&info->lock);
1177         if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) {
1178                 info->base_clock = tmp_params.clock_speed;
1179         } else {
1180                 info->params.mode            = tmp_params.mode;
1181                 info->params.loopback        = tmp_params.loopback;
1182                 info->params.flags           = tmp_params.flags;
1183                 info->params.encoding        = tmp_params.encoding;
1184                 info->params.clock_speed     = tmp_params.clock_speed;
1185                 info->params.addr_filter     = tmp_params.addr_filter;
1186                 info->params.crc_type        = tmp_params.crc_type;
1187                 info->params.preamble_length = tmp_params.preamble_length;
1188                 info->params.preamble        = tmp_params.preamble;
1189                 info->params.data_rate       = tmp_params.data_rate;
1190                 info->params.data_bits       = tmp_params.data_bits;
1191                 info->params.stop_bits       = tmp_params.stop_bits;
1192                 info->params.parity          = tmp_params.parity;
1193         }
1194         spin_unlock(&info->lock);
1195
1196         program_hw(info);
1197
1198         return 0;
1199 }
1200
1201 static long slgt_compat_ioctl(struct tty_struct *tty,
1202                          unsigned int cmd, unsigned long arg)
1203 {
1204         struct slgt_info *info = tty->driver_data;
1205         int rc = -ENOIOCTLCMD;
1206
1207         if (sanity_check(info, tty->name, "compat_ioctl"))
1208                 return -ENODEV;
1209         DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1210
1211         switch (cmd) {
1212
1213         case MGSL_IOCSPARAMS32:
1214                 rc = set_params32(info, compat_ptr(arg));
1215                 break;
1216
1217         case MGSL_IOCGPARAMS32:
1218                 rc = get_params32(info, compat_ptr(arg));
1219                 break;
1220
1221         case MGSL_IOCGPARAMS:
1222         case MGSL_IOCSPARAMS:
1223         case MGSL_IOCGTXIDLE:
1224         case MGSL_IOCGSTATS:
1225         case MGSL_IOCWAITEVENT:
1226         case MGSL_IOCGIF:
1227         case MGSL_IOCSGPIO:
1228         case MGSL_IOCGGPIO:
1229         case MGSL_IOCWAITGPIO:
1230         case MGSL_IOCGXSYNC:
1231         case MGSL_IOCGXCTRL:
1232         case MGSL_IOCSTXIDLE:
1233         case MGSL_IOCTXENABLE:
1234         case MGSL_IOCRXENABLE:
1235         case MGSL_IOCTXABORT:
1236         case TIOCMIWAIT:
1237         case MGSL_IOCSIF:
1238         case MGSL_IOCSXSYNC:
1239         case MGSL_IOCSXCTRL:
1240                 rc = ioctl(tty, cmd, arg);
1241                 break;
1242         }
1243
1244         DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1245         return rc;
1246 }
1247 #else
1248 #define slgt_compat_ioctl NULL
1249 #endif /* ifdef CONFIG_COMPAT */
1250
1251 /*
1252  * proc fs support
1253  */
1254 static inline void line_info(struct seq_file *m, struct slgt_info *info)
1255 {
1256         char stat_buf[30];
1257         unsigned long flags;
1258
1259         seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1260                       info->device_name, info->phys_reg_addr,
1261                       info->irq_level, info->max_frame_size);
1262
1263         /* output current serial signal states */
1264         spin_lock_irqsave(&info->lock,flags);
1265         get_signals(info);
1266         spin_unlock_irqrestore(&info->lock,flags);
1267
1268         stat_buf[0] = 0;
1269         stat_buf[1] = 0;
1270         if (info->signals & SerialSignal_RTS)
1271                 strcat(stat_buf, "|RTS");
1272         if (info->signals & SerialSignal_CTS)
1273                 strcat(stat_buf, "|CTS");
1274         if (info->signals & SerialSignal_DTR)
1275                 strcat(stat_buf, "|DTR");
1276         if (info->signals & SerialSignal_DSR)
1277                 strcat(stat_buf, "|DSR");
1278         if (info->signals & SerialSignal_DCD)
1279                 strcat(stat_buf, "|CD");
1280         if (info->signals & SerialSignal_RI)
1281                 strcat(stat_buf, "|RI");
1282
1283         if (info->params.mode != MGSL_MODE_ASYNC) {
1284                 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1285                                info->icount.txok, info->icount.rxok);
1286                 if (info->icount.txunder)
1287                         seq_printf(m, " txunder:%d", info->icount.txunder);
1288                 if (info->icount.txabort)
1289                         seq_printf(m, " txabort:%d", info->icount.txabort);
1290                 if (info->icount.rxshort)
1291                         seq_printf(m, " rxshort:%d", info->icount.rxshort);
1292                 if (info->icount.rxlong)
1293                         seq_printf(m, " rxlong:%d", info->icount.rxlong);
1294                 if (info->icount.rxover)
1295                         seq_printf(m, " rxover:%d", info->icount.rxover);
1296                 if (info->icount.rxcrc)
1297                         seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
1298         } else {
1299                 seq_printf(m, "\tASYNC tx:%d rx:%d",
1300                                info->icount.tx, info->icount.rx);
1301                 if (info->icount.frame)
1302                         seq_printf(m, " fe:%d", info->icount.frame);
1303                 if (info->icount.parity)
1304                         seq_printf(m, " pe:%d", info->icount.parity);
1305                 if (info->icount.brk)
1306                         seq_printf(m, " brk:%d", info->icount.brk);
1307                 if (info->icount.overrun)
1308                         seq_printf(m, " oe:%d", info->icount.overrun);
1309         }
1310
1311         /* Append serial signal status to end */
1312         seq_printf(m, " %s\n", stat_buf+1);
1313
1314         seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1315                        info->tx_active,info->bh_requested,info->bh_running,
1316                        info->pending_bh);
1317 }
1318
1319 /* Called to print information about devices
1320  */
1321 static int synclink_gt_proc_show(struct seq_file *m, void *v)
1322 {
1323         struct slgt_info *info;
1324
1325         seq_puts(m, "synclink_gt driver\n");
1326
1327         info = slgt_device_list;
1328         while( info ) {
1329                 line_info(m, info);
1330                 info = info->next_device;
1331         }
1332         return 0;
1333 }
1334
1335 static int synclink_gt_proc_open(struct inode *inode, struct file *file)
1336 {
1337         return single_open(file, synclink_gt_proc_show, NULL);
1338 }
1339
1340 static const struct file_operations synclink_gt_proc_fops = {
1341         .owner          = THIS_MODULE,
1342         .open           = synclink_gt_proc_open,
1343         .read           = seq_read,
1344         .llseek         = seq_lseek,
1345         .release        = single_release,
1346 };
1347
1348 /*
1349  * return count of bytes in transmit buffer
1350  */
1351 static int chars_in_buffer(struct tty_struct *tty)
1352 {
1353         struct slgt_info *info = tty->driver_data;
1354         int count;
1355         if (sanity_check(info, tty->name, "chars_in_buffer"))
1356                 return 0;
1357         count = tbuf_bytes(info);
1358         DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count));
1359         return count;
1360 }
1361
1362 /*
1363  * signal remote device to throttle send data (our receive data)
1364  */
1365 static void throttle(struct tty_struct * tty)
1366 {
1367         struct slgt_info *info = tty->driver_data;
1368         unsigned long flags;
1369
1370         if (sanity_check(info, tty->name, "throttle"))
1371                 return;
1372         DBGINFO(("%s throttle\n", info->device_name));
1373         if (I_IXOFF(tty))
1374                 send_xchar(tty, STOP_CHAR(tty));
1375         if (tty->termios.c_cflag & CRTSCTS) {
1376                 spin_lock_irqsave(&info->lock,flags);
1377                 info->signals &= ~SerialSignal_RTS;
1378                 set_signals(info);
1379                 spin_unlock_irqrestore(&info->lock,flags);
1380         }
1381 }
1382
1383 /*
1384  * signal remote device to stop throttling send data (our receive data)
1385  */
1386 static void unthrottle(struct tty_struct * tty)
1387 {
1388         struct slgt_info *info = tty->driver_data;
1389         unsigned long flags;
1390
1391         if (sanity_check(info, tty->name, "unthrottle"))
1392                 return;
1393         DBGINFO(("%s unthrottle\n", info->device_name));
1394         if (I_IXOFF(tty)) {
1395                 if (info->x_char)
1396                         info->x_char = 0;
1397                 else
1398                         send_xchar(tty, START_CHAR(tty));
1399         }
1400         if (tty->termios.c_cflag & CRTSCTS) {
1401                 spin_lock_irqsave(&info->lock,flags);
1402                 info->signals |= SerialSignal_RTS;
1403                 set_signals(info);
1404                 spin_unlock_irqrestore(&info->lock,flags);
1405         }
1406 }
1407
1408 /*
1409  * set or clear transmit break condition
1410  * break_state  -1=set break condition, 0=clear
1411  */
1412 static int set_break(struct tty_struct *tty, int break_state)
1413 {
1414         struct slgt_info *info = tty->driver_data;
1415         unsigned short value;
1416         unsigned long flags;
1417
1418         if (sanity_check(info, tty->name, "set_break"))
1419                 return -EINVAL;
1420         DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1421
1422         spin_lock_irqsave(&info->lock,flags);
1423         value = rd_reg16(info, TCR);
1424         if (break_state == -1)
1425                 value |= BIT6;
1426         else
1427                 value &= ~BIT6;
1428         wr_reg16(info, TCR, value);
1429         spin_unlock_irqrestore(&info->lock,flags);
1430         return 0;
1431 }
1432
1433 #if SYNCLINK_GENERIC_HDLC
1434
1435 /**
1436  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1437  * set encoding and frame check sequence (FCS) options
1438  *
1439  * dev       pointer to network device structure
1440  * encoding  serial encoding setting
1441  * parity    FCS setting
1442  *
1443  * returns 0 if success, otherwise error code
1444  */
1445 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1446                           unsigned short parity)
1447 {
1448         struct slgt_info *info = dev_to_port(dev);
1449         unsigned char  new_encoding;
1450         unsigned short new_crctype;
1451
1452         /* return error if TTY interface open */
1453         if (info->port.count)
1454                 return -EBUSY;
1455
1456         DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1457
1458         switch (encoding)
1459         {
1460         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1461         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1462         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1463         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1464         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1465         default: return -EINVAL;
1466         }
1467
1468         switch (parity)
1469         {
1470         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1471         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1472         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1473         default: return -EINVAL;
1474         }
1475
1476         info->params.encoding = new_encoding;
1477         info->params.crc_type = new_crctype;
1478
1479         /* if network interface up, reprogram hardware */
1480         if (info->netcount)
1481                 program_hw(info);
1482
1483         return 0;
1484 }
1485
1486 /**
1487  * called by generic HDLC layer to send frame
1488  *
1489  * skb  socket buffer containing HDLC frame
1490  * dev  pointer to network device structure
1491  */
1492 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1493                                       struct net_device *dev)
1494 {
1495         struct slgt_info *info = dev_to_port(dev);
1496         unsigned long flags;
1497
1498         DBGINFO(("%s hdlc_xmit\n", dev->name));
1499
1500         if (!skb->len)
1501                 return NETDEV_TX_OK;
1502
1503         /* stop sending until this frame completes */
1504         netif_stop_queue(dev);
1505
1506         /* update network statistics */
1507         dev->stats.tx_packets++;
1508         dev->stats.tx_bytes += skb->len;
1509
1510         /* save start time for transmit timeout detection */
1511         dev->trans_start = jiffies;
1512
1513         spin_lock_irqsave(&info->lock, flags);
1514         tx_load(info, skb->data, skb->len);
1515         spin_unlock_irqrestore(&info->lock, flags);
1516
1517         /* done with socket buffer, so free it */
1518         dev_kfree_skb(skb);
1519
1520         return NETDEV_TX_OK;
1521 }
1522
1523 /**
1524  * called by network layer when interface enabled
1525  * claim resources and initialize hardware
1526  *
1527  * dev  pointer to network device structure
1528  *
1529  * returns 0 if success, otherwise error code
1530  */
1531 static int hdlcdev_open(struct net_device *dev)
1532 {
1533         struct slgt_info *info = dev_to_port(dev);
1534         int rc;
1535         unsigned long flags;
1536
1537         if (!try_module_get(THIS_MODULE))
1538                 return -EBUSY;
1539
1540         DBGINFO(("%s hdlcdev_open\n", dev->name));
1541
1542         /* generic HDLC layer open processing */
1543         if ((rc = hdlc_open(dev)))
1544                 return rc;
1545
1546         /* arbitrate between network and tty opens */
1547         spin_lock_irqsave(&info->netlock, flags);
1548         if (info->port.count != 0 || info->netcount != 0) {
1549                 DBGINFO(("%s hdlc_open busy\n", dev->name));
1550                 spin_unlock_irqrestore(&info->netlock, flags);
1551                 return -EBUSY;
1552         }
1553         info->netcount=1;
1554         spin_unlock_irqrestore(&info->netlock, flags);
1555
1556         /* claim resources and init adapter */
1557         if ((rc = startup(info)) != 0) {
1558                 spin_lock_irqsave(&info->netlock, flags);
1559                 info->netcount=0;
1560                 spin_unlock_irqrestore(&info->netlock, flags);
1561                 return rc;
1562         }
1563
1564         /* assert DTR and RTS, apply hardware settings */
1565         info->signals |= SerialSignal_RTS + SerialSignal_DTR;
1566         program_hw(info);
1567
1568         /* enable network layer transmit */
1569         dev->trans_start = jiffies;
1570         netif_start_queue(dev);
1571
1572         /* inform generic HDLC layer of current DCD status */
1573         spin_lock_irqsave(&info->lock, flags);
1574         get_signals(info);
1575         spin_unlock_irqrestore(&info->lock, flags);
1576         if (info->signals & SerialSignal_DCD)
1577                 netif_carrier_on(dev);
1578         else
1579                 netif_carrier_off(dev);
1580         return 0;
1581 }
1582
1583 /**
1584  * called by network layer when interface is disabled
1585  * shutdown hardware and release resources
1586  *
1587  * dev  pointer to network device structure
1588  *
1589  * returns 0 if success, otherwise error code
1590  */
1591 static int hdlcdev_close(struct net_device *dev)
1592 {
1593         struct slgt_info *info = dev_to_port(dev);
1594         unsigned long flags;
1595
1596         DBGINFO(("%s hdlcdev_close\n", dev->name));
1597
1598         netif_stop_queue(dev);
1599
1600         /* shutdown adapter and release resources */
1601         shutdown(info);
1602
1603         hdlc_close(dev);
1604
1605         spin_lock_irqsave(&info->netlock, flags);
1606         info->netcount=0;
1607         spin_unlock_irqrestore(&info->netlock, flags);
1608
1609         module_put(THIS_MODULE);
1610         return 0;
1611 }
1612
1613 /**
1614  * called by network layer to process IOCTL call to network device
1615  *
1616  * dev  pointer to network device structure
1617  * ifr  pointer to network interface request structure
1618  * cmd  IOCTL command code
1619  *
1620  * returns 0 if success, otherwise error code
1621  */
1622 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1623 {
1624         const size_t size = sizeof(sync_serial_settings);
1625         sync_serial_settings new_line;
1626         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1627         struct slgt_info *info = dev_to_port(dev);
1628         unsigned int flags;
1629
1630         DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1631
1632         /* return error if TTY interface open */
1633         if (info->port.count)
1634                 return -EBUSY;
1635
1636         if (cmd != SIOCWANDEV)
1637                 return hdlc_ioctl(dev, ifr, cmd);
1638
1639         memset(&new_line, 0, sizeof(new_line));
1640
1641         switch(ifr->ifr_settings.type) {
1642         case IF_GET_IFACE: /* return current sync_serial_settings */
1643
1644                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1645                 if (ifr->ifr_settings.size < size) {
1646                         ifr->ifr_settings.size = size; /* data size wanted */
1647                         return -ENOBUFS;
1648                 }
1649
1650                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1651                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1652                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1653                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1654
1655                 switch (flags){
1656                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1657                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1658                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1659                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1660                 default: new_line.clock_type = CLOCK_DEFAULT;
1661                 }
1662
1663                 new_line.clock_rate = info->params.clock_speed;
1664                 new_line.loopback   = info->params.loopback ? 1:0;
1665
1666                 if (copy_to_user(line, &new_line, size))
1667                         return -EFAULT;
1668                 return 0;
1669
1670         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1671
1672                 if(!capable(CAP_NET_ADMIN))
1673                         return -EPERM;
1674                 if (copy_from_user(&new_line, line, size))
1675                         return -EFAULT;
1676
1677                 switch (new_line.clock_type)
1678                 {
1679                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1680                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1681                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1682                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1683                 case CLOCK_DEFAULT:  flags = info->params.flags &
1684                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1685                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1686                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1687                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1688                 default: return -EINVAL;
1689                 }
1690
1691                 if (new_line.loopback != 0 && new_line.loopback != 1)
1692                         return -EINVAL;
1693
1694                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1695                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1696                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1697                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1698                 info->params.flags |= flags;
1699
1700                 info->params.loopback = new_line.loopback;
1701
1702                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1703                         info->params.clock_speed = new_line.clock_rate;
1704                 else
1705                         info->params.clock_speed = 0;
1706
1707                 /* if network interface up, reprogram hardware */
1708                 if (info->netcount)
1709                         program_hw(info);
1710                 return 0;
1711
1712         default:
1713                 return hdlc_ioctl(dev, ifr, cmd);
1714         }
1715 }
1716
1717 /**
1718  * called by network layer when transmit timeout is detected
1719  *
1720  * dev  pointer to network device structure
1721  */
1722 static void hdlcdev_tx_timeout(struct net_device *dev)
1723 {
1724         struct slgt_info *info = dev_to_port(dev);
1725         unsigned long flags;
1726
1727         DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1728
1729         dev->stats.tx_errors++;
1730         dev->stats.tx_aborted_errors++;
1731
1732         spin_lock_irqsave(&info->lock,flags);
1733         tx_stop(info);
1734         spin_unlock_irqrestore(&info->lock,flags);
1735
1736         netif_wake_queue(dev);
1737 }
1738
1739 /**
1740  * called by device driver when transmit completes
1741  * reenable network layer transmit if stopped
1742  *
1743  * info  pointer to device instance information
1744  */
1745 static void hdlcdev_tx_done(struct slgt_info *info)
1746 {
1747         if (netif_queue_stopped(info->netdev))
1748                 netif_wake_queue(info->netdev);
1749 }
1750
1751 /**
1752  * called by device driver when frame received
1753  * pass frame to network layer
1754  *
1755  * info  pointer to device instance information
1756  * buf   pointer to buffer contianing frame data
1757  * size  count of data bytes in buf
1758  */
1759 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1760 {
1761         struct sk_buff *skb = dev_alloc_skb(size);
1762         struct net_device *dev = info->netdev;
1763
1764         DBGINFO(("%s hdlcdev_rx\n", dev->name));
1765
1766         if (skb == NULL) {
1767                 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1768                 dev->stats.rx_dropped++;
1769                 return;
1770         }
1771
1772         memcpy(skb_put(skb, size), buf, size);
1773
1774         skb->protocol = hdlc_type_trans(skb, dev);
1775
1776         dev->stats.rx_packets++;
1777         dev->stats.rx_bytes += size;
1778
1779         netif_rx(skb);
1780 }
1781
1782 static const struct net_device_ops hdlcdev_ops = {
1783         .ndo_open       = hdlcdev_open,
1784         .ndo_stop       = hdlcdev_close,
1785         .ndo_change_mtu = hdlc_change_mtu,
1786         .ndo_start_xmit = hdlc_start_xmit,
1787         .ndo_do_ioctl   = hdlcdev_ioctl,
1788         .ndo_tx_timeout = hdlcdev_tx_timeout,
1789 };
1790
1791 /**
1792  * called by device driver when adding device instance
1793  * do generic HDLC initialization
1794  *
1795  * info  pointer to device instance information
1796  *
1797  * returns 0 if success, otherwise error code
1798  */
1799 static int hdlcdev_init(struct slgt_info *info)
1800 {
1801         int rc;
1802         struct net_device *dev;
1803         hdlc_device *hdlc;
1804
1805         /* allocate and initialize network and HDLC layer objects */
1806
1807         if (!(dev = alloc_hdlcdev(info))) {
1808                 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1809                 return -ENOMEM;
1810         }
1811
1812         /* for network layer reporting purposes only */
1813         dev->mem_start = info->phys_reg_addr;
1814         dev->mem_end   = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1815         dev->irq       = info->irq_level;
1816
1817         /* network layer callbacks and settings */
1818         dev->netdev_ops     = &hdlcdev_ops;
1819         dev->watchdog_timeo = 10 * HZ;
1820         dev->tx_queue_len   = 50;
1821
1822         /* generic HDLC layer callbacks and settings */
1823         hdlc         = dev_to_hdlc(dev);
1824         hdlc->attach = hdlcdev_attach;
1825         hdlc->xmit   = hdlcdev_xmit;
1826
1827         /* register objects with HDLC layer */
1828         if ((rc = register_hdlc_device(dev))) {
1829                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1830                 free_netdev(dev);
1831                 return rc;
1832         }
1833
1834         info->netdev = dev;
1835         return 0;
1836 }
1837
1838 /**
1839  * called by device driver when removing device instance
1840  * do generic HDLC cleanup
1841  *
1842  * info  pointer to device instance information
1843  */
1844 static void hdlcdev_exit(struct slgt_info *info)
1845 {
1846         unregister_hdlc_device(info->netdev);
1847         free_netdev(info->netdev);
1848         info->netdev = NULL;
1849 }
1850
1851 #endif /* ifdef CONFIG_HDLC */
1852
1853 /*
1854  * get async data from rx DMA buffers
1855  */
1856 static void rx_async(struct slgt_info *info)
1857 {
1858         struct tty_struct *tty = info->port.tty;
1859         struct mgsl_icount *icount = &info->icount;
1860         unsigned int start, end;
1861         unsigned char *p;
1862         unsigned char status;
1863         struct slgt_desc *bufs = info->rbufs;
1864         int i, count;
1865         int chars = 0;
1866         int stat;
1867         unsigned char ch;
1868
1869         start = end = info->rbuf_current;
1870
1871         while(desc_complete(bufs[end])) {
1872                 count = desc_count(bufs[end]) - info->rbuf_index;
1873                 p     = bufs[end].buf + info->rbuf_index;
1874
1875                 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1876                 DBGDATA(info, p, count, "rx");
1877
1878                 for(i=0 ; i < count; i+=2, p+=2) {
1879                         ch = *p;
1880                         icount->rx++;
1881
1882                         stat = 0;
1883
1884                         if ((status = *(p+1) & (BIT1 + BIT0))) {
1885                                 if (status & BIT1)
1886                                         icount->parity++;
1887                                 else if (status & BIT0)
1888                                         icount->frame++;
1889                                 /* discard char if tty control flags say so */
1890                                 if (status & info->ignore_status_mask)
1891                                         continue;
1892                                 if (status & BIT1)
1893                                         stat = TTY_PARITY;
1894                                 else if (status & BIT0)
1895                                         stat = TTY_FRAME;
1896                         }
1897                         if (tty) {
1898                                 tty_insert_flip_char(tty, ch, stat);
1899                                 chars++;
1900                         }
1901                 }
1902
1903                 if (i < count) {
1904                         /* receive buffer not completed */
1905                         info->rbuf_index += i;
1906                         mod_timer(&info->rx_timer, jiffies + 1);
1907                         break;
1908                 }
1909
1910                 info->rbuf_index = 0;
1911                 free_rbufs(info, end, end);
1912
1913                 if (++end == info->rbuf_count)
1914                         end = 0;
1915
1916                 /* if entire list searched then no frame available */
1917                 if (end == start)
1918                         break;
1919         }
1920
1921         if (tty && chars)
1922                 tty_flip_buffer_push(tty);
1923 }
1924
1925 /*
1926  * return next bottom half action to perform
1927  */
1928 static int bh_action(struct slgt_info *info)
1929 {
1930         unsigned long flags;
1931         int rc;
1932
1933         spin_lock_irqsave(&info->lock,flags);
1934
1935         if (info->pending_bh & BH_RECEIVE) {
1936                 info->pending_bh &= ~BH_RECEIVE;
1937                 rc = BH_RECEIVE;
1938         } else if (info->pending_bh & BH_TRANSMIT) {
1939                 info->pending_bh &= ~BH_TRANSMIT;
1940                 rc = BH_TRANSMIT;
1941         } else if (info->pending_bh & BH_STATUS) {
1942                 info->pending_bh &= ~BH_STATUS;
1943                 rc = BH_STATUS;
1944         } else {
1945                 /* Mark BH routine as complete */
1946                 info->bh_running = false;
1947                 info->bh_requested = false;
1948                 rc = 0;
1949         }
1950
1951         spin_unlock_irqrestore(&info->lock,flags);
1952
1953         return rc;
1954 }
1955
1956 /*
1957  * perform bottom half processing
1958  */
1959 static void bh_handler(struct work_struct *work)
1960 {
1961         struct slgt_info *info = container_of(work, struct slgt_info, task);
1962         int action;
1963
1964         if (!info)
1965                 return;
1966         info->bh_running = true;
1967
1968         while((action = bh_action(info))) {
1969                 switch (action) {
1970                 case BH_RECEIVE:
1971                         DBGBH(("%s bh receive\n", info->device_name));
1972                         switch(info->params.mode) {
1973                         case MGSL_MODE_ASYNC:
1974                                 rx_async(info);
1975                                 break;
1976                         case MGSL_MODE_HDLC:
1977                                 while(rx_get_frame(info));
1978                                 break;
1979                         case MGSL_MODE_RAW:
1980                         case MGSL_MODE_MONOSYNC:
1981                         case MGSL_MODE_BISYNC:
1982                         case MGSL_MODE_XSYNC:
1983                                 while(rx_get_buf(info));
1984                                 break;
1985                         }
1986                         /* restart receiver if rx DMA buffers exhausted */
1987                         if (info->rx_restart)
1988                                 rx_start(info);
1989                         break;
1990                 case BH_TRANSMIT:
1991                         bh_transmit(info);
1992                         break;
1993                 case BH_STATUS:
1994                         DBGBH(("%s bh status\n", info->device_name));
1995                         info->ri_chkcount = 0;
1996                         info->dsr_chkcount = 0;
1997                         info->dcd_chkcount = 0;
1998                         info->cts_chkcount = 0;
1999                         break;
2000                 default:
2001                         DBGBH(("%s unknown action\n", info->device_name));
2002                         break;
2003                 }
2004         }
2005         DBGBH(("%s bh_handler exit\n", info->device_name));
2006 }
2007
2008 static void bh_transmit(struct slgt_info *info)
2009 {
2010         struct tty_struct *tty = info->port.tty;
2011
2012         DBGBH(("%s bh_transmit\n", info->device_name));
2013         if (tty)
2014                 tty_wakeup(tty);
2015 }
2016
2017 static void dsr_change(struct slgt_info *info, unsigned short status)
2018 {
2019         if (status & BIT3) {
2020                 info->signals |= SerialSignal_DSR;
2021                 info->input_signal_events.dsr_up++;
2022         } else {
2023                 info->signals &= ~SerialSignal_DSR;
2024                 info->input_signal_events.dsr_down++;
2025         }
2026         DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
2027         if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2028                 slgt_irq_off(info, IRQ_DSR);
2029                 return;
2030         }
2031         info->icount.dsr++;
2032         wake_up_interruptible(&info->status_event_wait_q);
2033         wake_up_interruptible(&info->event_wait_q);
2034         info->pending_bh |= BH_STATUS;
2035 }
2036
2037 static void cts_change(struct slgt_info *info, unsigned short status)
2038 {
2039         if (status & BIT2) {
2040                 info->signals |= SerialSignal_CTS;
2041                 info->input_signal_events.cts_up++;
2042         } else {
2043                 info->signals &= ~SerialSignal_CTS;
2044                 info->input_signal_events.cts_down++;
2045         }
2046         DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
2047         if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2048                 slgt_irq_off(info, IRQ_CTS);
2049                 return;
2050         }
2051         info->icount.cts++;
2052         wake_up_interruptible(&info->status_event_wait_q);
2053         wake_up_interruptible(&info->event_wait_q);
2054         info->pending_bh |= BH_STATUS;
2055
2056         if (tty_port_cts_enabled(&info->port)) {
2057                 if (info->port.tty) {
2058                         if (info->port.tty->hw_stopped) {
2059                                 if (info->signals & SerialSignal_CTS) {
2060                                         info->port.tty->hw_stopped = 0;
2061                                         info->pending_bh |= BH_TRANSMIT;
2062                                         return;
2063                                 }
2064                         } else {
2065                                 if (!(info->signals & SerialSignal_CTS))
2066                                         info->port.tty->hw_stopped = 1;
2067                         }
2068                 }
2069         }
2070 }
2071
2072 static void dcd_change(struct slgt_info *info, unsigned short status)
2073 {
2074         if (status & BIT1) {
2075                 info->signals |= SerialSignal_DCD;
2076                 info->input_signal_events.dcd_up++;
2077         } else {
2078                 info->signals &= ~SerialSignal_DCD;
2079                 info->input_signal_events.dcd_down++;
2080         }
2081         DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
2082         if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2083                 slgt_irq_off(info, IRQ_DCD);
2084                 return;
2085         }
2086         info->icount.dcd++;
2087 #if SYNCLINK_GENERIC_HDLC
2088         if (info->netcount) {
2089                 if (info->signals & SerialSignal_DCD)
2090                         netif_carrier_on(info->netdev);
2091                 else
2092                         netif_carrier_off(info->netdev);
2093         }
2094 #endif
2095         wake_up_interruptible(&info->status_event_wait_q);
2096         wake_up_interruptible(&info->event_wait_q);
2097         info->pending_bh |= BH_STATUS;
2098
2099         if (info->port.flags & ASYNC_CHECK_CD) {
2100                 if (info->signals & SerialSignal_DCD)
2101                         wake_up_interruptible(&info->port.open_wait);
2102                 else {
2103                         if (info->port.tty)
2104                                 tty_hangup(info->port.tty);
2105                 }
2106         }
2107 }
2108
2109 static void ri_change(struct slgt_info *info, unsigned short status)
2110 {
2111         if (status & BIT0) {
2112                 info->signals |= SerialSignal_RI;
2113                 info->input_signal_events.ri_up++;
2114         } else {
2115                 info->signals &= ~SerialSignal_RI;
2116                 info->input_signal_events.ri_down++;
2117         }
2118         DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2119         if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2120                 slgt_irq_off(info, IRQ_RI);
2121                 return;
2122         }
2123         info->icount.rng++;
2124         wake_up_interruptible(&info->status_event_wait_q);
2125         wake_up_interruptible(&info->event_wait_q);
2126         info->pending_bh |= BH_STATUS;
2127 }
2128
2129 static void isr_rxdata(struct slgt_info *info)
2130 {
2131         unsigned int count = info->rbuf_fill_count;
2132         unsigned int i = info->rbuf_fill_index;
2133         unsigned short reg;
2134
2135         while (rd_reg16(info, SSR) & IRQ_RXDATA) {
2136                 reg = rd_reg16(info, RDR);
2137                 DBGISR(("isr_rxdata %s RDR=%04X\n", info->device_name, reg));
2138                 if (desc_complete(info->rbufs[i])) {
2139                         /* all buffers full */
2140                         rx_stop(info);
2141                         info->rx_restart = 1;
2142                         continue;
2143                 }
2144                 info->rbufs[i].buf[count++] = (unsigned char)reg;
2145                 /* async mode saves status byte to buffer for each data byte */
2146                 if (info->params.mode == MGSL_MODE_ASYNC)
2147                         info->rbufs[i].buf[count++] = (unsigned char)(reg >> 8);
2148                 if (count == info->rbuf_fill_level || (reg & BIT10)) {
2149                         /* buffer full or end of frame */
2150                         set_desc_count(info->rbufs[i], count);
2151                         set_desc_status(info->rbufs[i], BIT15 | (reg >> 8));
2152                         info->rbuf_fill_count = count = 0;
2153                         if (++i == info->rbuf_count)
2154                                 i = 0;
2155                         info->pending_bh |= BH_RECEIVE;
2156                 }
2157         }
2158
2159         info->rbuf_fill_index = i;
2160         info->rbuf_fill_count = count;
2161 }
2162
2163 static void isr_serial(struct slgt_info *info)
2164 {
2165         unsigned short status = rd_reg16(info, SSR);
2166
2167         DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2168
2169         wr_reg16(info, SSR, status); /* clear pending */
2170
2171         info->irq_occurred = true;
2172
2173         if (info->params.mode == MGSL_MODE_ASYNC) {
2174                 if (status & IRQ_TXIDLE) {
2175                         if (info->tx_active)
2176                                 isr_txeom(info, status);
2177                 }
2178                 if (info->rx_pio && (status & IRQ_RXDATA))
2179                         isr_rxdata(info);
2180                 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2181                         info->icount.brk++;
2182                         /* process break detection if tty control allows */
2183                         if (info->port.tty) {
2184                                 if (!(status & info->ignore_status_mask)) {
2185                                         if (info->read_status_mask & MASK_BREAK) {
2186                                                 tty_insert_flip_char(info->port.tty, 0, TTY_BREAK);
2187                                                 if (info->port.flags & ASYNC_SAK)
2188                                                         do_SAK(info->port.tty);
2189                                         }
2190                                 }
2191                         }
2192                 }
2193         } else {
2194                 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2195                         isr_txeom(info, status);
2196                 if (info->rx_pio && (status & IRQ_RXDATA))
2197                         isr_rxdata(info);
2198                 if (status & IRQ_RXIDLE) {
2199                         if (status & RXIDLE)
2200                                 info->icount.rxidle++;
2201                         else
2202                                 info->icount.exithunt++;
2203                         wake_up_interruptible(&info->event_wait_q);
2204                 }
2205
2206                 if (status & IRQ_RXOVER)
2207                         rx_start(info);
2208         }
2209
2210         if (status & IRQ_DSR)
2211                 dsr_change(info, status);
2212         if (status & IRQ_CTS)
2213                 cts_change(info, status);
2214         if (status & IRQ_DCD)
2215                 dcd_change(info, status);
2216         if (status & IRQ_RI)
2217                 ri_change(info, status);
2218 }
2219
2220 static void isr_rdma(struct slgt_info *info)
2221 {
2222         unsigned int status = rd_reg32(info, RDCSR);
2223
2224         DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2225
2226         /* RDCSR (rx DMA control/status)
2227          *
2228          * 31..07  reserved
2229          * 06      save status byte to DMA buffer
2230          * 05      error
2231          * 04      eol (end of list)
2232          * 03      eob (end of buffer)
2233          * 02      IRQ enable
2234          * 01      reset
2235          * 00      enable
2236          */
2237         wr_reg32(info, RDCSR, status);  /* clear pending */
2238
2239         if (status & (BIT5 + BIT4)) {
2240                 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2241                 info->rx_restart = true;
2242         }
2243         info->pending_bh |= BH_RECEIVE;
2244 }
2245
2246 static void isr_tdma(struct slgt_info *info)
2247 {
2248         unsigned int status = rd_reg32(info, TDCSR);
2249
2250         DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2251
2252         /* TDCSR (tx DMA control/status)
2253          *
2254          * 31..06  reserved
2255          * 05      error
2256          * 04      eol (end of list)
2257          * 03      eob (end of buffer)
2258          * 02      IRQ enable
2259          * 01      reset
2260          * 00      enable
2261          */
2262         wr_reg32(info, TDCSR, status);  /* clear pending */
2263
2264         if (status & (BIT5 + BIT4 + BIT3)) {
2265                 // another transmit buffer has completed
2266                 // run bottom half to get more send data from user
2267                 info->pending_bh |= BH_TRANSMIT;
2268         }
2269 }
2270
2271 /*
2272  * return true if there are unsent tx DMA buffers, otherwise false
2273  *
2274  * if there are unsent buffers then info->tbuf_start
2275  * is set to index of first unsent buffer
2276  */
2277 static bool unsent_tbufs(struct slgt_info *info)
2278 {
2279         unsigned int i = info->tbuf_current;
2280         bool rc = false;
2281
2282         /*
2283          * search backwards from last loaded buffer (precedes tbuf_current)
2284          * for first unsent buffer (desc_count > 0)
2285          */
2286
2287         do {
2288                 if (i)
2289                         i--;
2290                 else
2291                         i = info->tbuf_count - 1;
2292                 if (!desc_count(info->tbufs[i]))
2293                         break;
2294                 info->tbuf_start = i;
2295                 rc = true;
2296         } while (i != info->tbuf_current);
2297
2298         return rc;
2299 }
2300
2301 static void isr_txeom(struct slgt_info *info, unsigned short status)
2302 {
2303         DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2304
2305         slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2306         tdma_reset(info);
2307         if (status & IRQ_TXUNDER) {
2308                 unsigned short val = rd_reg16(info, TCR);
2309                 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2310                 wr_reg16(info, TCR, val); /* clear reset bit */
2311         }
2312
2313         if (info->tx_active) {
2314                 if (info->params.mode != MGSL_MODE_ASYNC) {
2315                         if (status & IRQ_TXUNDER)
2316                                 info->icount.txunder++;
2317                         else if (status & IRQ_TXIDLE)
2318                                 info->icount.txok++;
2319                 }
2320
2321                 if (unsent_tbufs(info)) {
2322                         tx_start(info);
2323                         update_tx_timer(info);
2324                         return;
2325                 }
2326                 info->tx_active = false;
2327
2328                 del_timer(&info->tx_timer);
2329
2330                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2331                         info->signals &= ~SerialSignal_RTS;
2332                         info->drop_rts_on_tx_done = false;
2333                         set_signals(info);
2334                 }
2335
2336 #if SYNCLINK_GENERIC_HDLC
2337                 if (info->netcount)
2338                         hdlcdev_tx_done(info);
2339                 else
2340 #endif
2341                 {
2342                         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2343                                 tx_stop(info);
2344                                 return;
2345                         }
2346                         info->pending_bh |= BH_TRANSMIT;
2347                 }
2348         }
2349 }
2350
2351 static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2352 {
2353         struct cond_wait *w, *prev;
2354
2355         /* wake processes waiting for specific transitions */
2356         for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2357                 if (w->data & changed) {
2358                         w->data = state;
2359                         wake_up_interruptible(&w->q);
2360                         if (prev != NULL)
2361                                 prev->next = w->next;
2362                         else
2363                                 info->gpio_wait_q = w->next;
2364                 } else
2365                         prev = w;
2366         }
2367 }
2368
2369 /* interrupt service routine
2370  *
2371  *      irq     interrupt number
2372  *      dev_id  device ID supplied during interrupt registration
2373  */
2374 static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2375 {
2376         struct slgt_info *info = dev_id;
2377         unsigned int gsr;
2378         unsigned int i;
2379
2380         DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2381
2382         while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2383                 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2384                 info->irq_occurred = true;
2385                 for(i=0; i < info->port_count ; i++) {
2386                         if (info->port_array[i] == NULL)
2387                                 continue;
2388                         spin_lock(&info->port_array[i]->lock);
2389                         if (gsr & (BIT8 << i))
2390                                 isr_serial(info->port_array[i]);
2391                         if (gsr & (BIT16 << (i*2)))
2392                                 isr_rdma(info->port_array[i]);
2393                         if (gsr & (BIT17 << (i*2)))
2394                                 isr_tdma(info->port_array[i]);
2395                         spin_unlock(&info->port_array[i]->lock);
2396                 }
2397         }
2398
2399         if (info->gpio_present) {
2400                 unsigned int state;
2401                 unsigned int changed;
2402                 spin_lock(&info->lock);
2403                 while ((changed = rd_reg32(info, IOSR)) != 0) {
2404                         DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2405                         /* read latched state of GPIO signals */
2406                         state = rd_reg32(info, IOVR);
2407                         /* clear pending GPIO interrupt bits */
2408                         wr_reg32(info, IOSR, changed);
2409                         for (i=0 ; i < info->port_count ; i++) {
2410                                 if (info->port_array[i] != NULL)
2411                                         isr_gpio(info->port_array[i], changed, state);
2412                         }
2413                 }
2414                 spin_unlock(&info->lock);
2415         }
2416
2417         for(i=0; i < info->port_count ; i++) {
2418                 struct slgt_info *port = info->port_array[i];
2419                 if (port == NULL)
2420                         continue;
2421                 spin_lock(&port->lock);
2422                 if ((port->port.count || port->netcount) &&
2423                     port->pending_bh && !port->bh_running &&
2424                     !port->bh_requested) {
2425                         DBGISR(("%s bh queued\n", port->device_name));
2426                         schedule_work(&port->task);
2427                         port->bh_requested = true;
2428                 }
2429                 spin_unlock(&port->lock);
2430         }
2431
2432         DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2433         return IRQ_HANDLED;
2434 }
2435
2436 static int startup(struct slgt_info *info)
2437 {
2438         DBGINFO(("%s startup\n", info->device_name));
2439
2440         if (info->port.flags & ASYNC_INITIALIZED)
2441                 return 0;
2442
2443         if (!info->tx_buf) {
2444                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2445                 if (!info->tx_buf) {
2446                         DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2447                         return -ENOMEM;
2448                 }
2449         }
2450
2451         info->pending_bh = 0;
2452
2453         memset(&info->icount, 0, sizeof(info->icount));
2454
2455         /* program hardware for current parameters */
2456         change_params(info);
2457
2458         if (info->port.tty)
2459                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2460
2461         info->port.flags |= ASYNC_INITIALIZED;
2462
2463         return 0;
2464 }
2465
2466 /*
2467  *  called by close() and hangup() to shutdown hardware
2468  */
2469 static void shutdown(struct slgt_info *info)
2470 {
2471         unsigned long flags;
2472
2473         if (!(info->port.flags & ASYNC_INITIALIZED))
2474                 return;
2475
2476         DBGINFO(("%s shutdown\n", info->device_name));
2477
2478         /* clear status wait queue because status changes */
2479         /* can't happen after shutting down the hardware */
2480         wake_up_interruptible(&info->status_event_wait_q);
2481         wake_up_interruptible(&info->event_wait_q);
2482
2483         del_timer_sync(&info->tx_timer);
2484         del_timer_sync(&info->rx_timer);
2485
2486         kfree(info->tx_buf);
2487         info->tx_buf = NULL;
2488
2489         spin_lock_irqsave(&info->lock,flags);
2490
2491         tx_stop(info);
2492         rx_stop(info);
2493
2494         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2495
2496         if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2497                 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2498                 set_signals(info);
2499         }
2500
2501         flush_cond_wait(&info->gpio_wait_q);
2502
2503         spin_unlock_irqrestore(&info->lock,flags);
2504
2505         if (info->port.tty)
2506                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2507
2508         info->port.flags &= ~ASYNC_INITIALIZED;
2509 }
2510
2511 static void program_hw(struct slgt_info *info)
2512 {
2513         unsigned long flags;
2514
2515         spin_lock_irqsave(&info->lock,flags);
2516
2517         rx_stop(info);
2518         tx_stop(info);
2519
2520         if (info->params.mode != MGSL_MODE_ASYNC ||
2521             info->netcount)
2522                 sync_mode(info);
2523         else
2524                 async_mode(info);
2525
2526         set_signals(info);
2527
2528         info->dcd_chkcount = 0;
2529         info->cts_chkcount = 0;
2530         info->ri_chkcount = 0;
2531         info->dsr_chkcount = 0;
2532
2533         slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI);
2534         get_signals(info);
2535
2536         if (info->netcount ||
2537             (info->port.tty && info->port.tty->termios.c_cflag & CREAD))
2538                 rx_start(info);
2539
2540         spin_unlock_irqrestore(&info->lock,flags);
2541 }
2542
2543 /*
2544  * reconfigure adapter based on new parameters
2545  */
2546 static void change_params(struct slgt_info *info)
2547 {
2548         unsigned cflag;
2549         int bits_per_char;
2550
2551         if (!info->port.tty)
2552                 return;
2553         DBGINFO(("%s change_params\n", info->device_name));
2554
2555         cflag = info->port.tty->termios.c_cflag;
2556
2557         /* if B0 rate (hangup) specified then negate DTR and RTS */
2558         /* otherwise assert DTR and RTS */
2559         if (cflag & CBAUD)
2560                 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
2561         else
2562                 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2563
2564         /* byte size and parity */
2565
2566         switch (cflag & CSIZE) {
2567         case CS5: info->params.data_bits = 5; break;
2568         case CS6: info->params.data_bits = 6; break;
2569         case CS7: info->params.data_bits = 7; break;
2570         case CS8: info->params.data_bits = 8; break;
2571         default:  info->params.data_bits = 7; break;
2572         }
2573
2574         info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2575
2576         if (cflag & PARENB)
2577                 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2578         else
2579                 info->params.parity = ASYNC_PARITY_NONE;
2580
2581         /* calculate number of jiffies to transmit a full
2582          * FIFO (32 bytes) at specified data rate
2583          */
2584         bits_per_char = info->params.data_bits +
2585                         info->params.stop_bits + 1;
2586
2587         info->params.data_rate = tty_get_baud_rate(info->port.tty);
2588
2589         if (info->params.data_rate) {
2590                 info->timeout = (32*HZ*bits_per_char) /
2591                                 info->params.data_rate;
2592         }
2593         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2594
2595         if (cflag & CRTSCTS)
2596                 info->port.flags |= ASYNC_CTS_FLOW;
2597         else
2598                 info->port.flags &= ~ASYNC_CTS_FLOW;
2599
2600         if (cflag & CLOCAL)
2601                 info->port.flags &= ~ASYNC_CHECK_CD;
2602         else
2603                 info->port.flags |= ASYNC_CHECK_CD;
2604
2605         /* process tty input control flags */
2606
2607         info->read_status_mask = IRQ_RXOVER;
2608         if (I_INPCK(info->port.tty))
2609                 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2610         if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2611                 info->read_status_mask |= MASK_BREAK;
2612         if (I_IGNPAR(info->port.tty))
2613                 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2614         if (I_IGNBRK(info->port.tty)) {
2615                 info->ignore_status_mask |= MASK_BREAK;
2616                 /* If ignoring parity and break indicators, ignore
2617                  * overruns too.  (For real raw support).
2618                  */
2619                 if (I_IGNPAR(info->port.tty))
2620                         info->ignore_status_mask |= MASK_OVERRUN;
2621         }
2622
2623         program_hw(info);
2624 }
2625
2626 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2627 {
2628         DBGINFO(("%s get_stats\n",  info->device_name));
2629         if (!user_icount) {
2630                 memset(&info->icount, 0, sizeof(info->icount));
2631         } else {
2632                 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2633                         return -EFAULT;
2634         }
2635         return 0;
2636 }
2637
2638 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2639 {
2640         DBGINFO(("%s get_params\n", info->device_name));
2641         if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2642                 return -EFAULT;
2643         return 0;
2644 }
2645
2646 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2647 {
2648         unsigned long flags;
2649         MGSL_PARAMS tmp_params;
2650
2651         DBGINFO(("%s set_params\n", info->device_name));
2652         if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2653                 return -EFAULT;
2654
2655         spin_lock_irqsave(&info->lock, flags);
2656         if (tmp_params.mode == MGSL_MODE_BASE_CLOCK)
2657                 info->base_clock = tmp_params.clock_speed;
2658         else
2659                 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2660         spin_unlock_irqrestore(&info->lock, flags);
2661
2662         program_hw(info);
2663
2664         return 0;
2665 }
2666
2667 static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2668 {
2669         DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2670         if (put_user(info->idle_mode, idle_mode))
2671                 return -EFAULT;
2672         return 0;
2673 }
2674
2675 static int set_txidle(struct slgt_info *info, int idle_mode)
2676 {
2677         unsigned long flags;
2678         DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2679         spin_lock_irqsave(&info->lock,flags);
2680         info->idle_mode = idle_mode;
2681         if (info->params.mode != MGSL_MODE_ASYNC)
2682                 tx_set_idle(info);
2683         spin_unlock_irqrestore(&info->lock,flags);
2684         return 0;
2685 }
2686
2687 static int tx_enable(struct slgt_info *info, int enable)
2688 {
2689         unsigned long flags;
2690         DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2691         spin_lock_irqsave(&info->lock,flags);
2692         if (enable) {
2693                 if (!info->tx_enabled)
2694                         tx_start(info);
2695         } else {
2696                 if (info->tx_enabled)
2697                         tx_stop(info);
2698         }
2699         spin_unlock_irqrestore(&info->lock,flags);
2700         return 0;
2701 }
2702
2703 /*
2704  * abort transmit HDLC frame
2705  */
2706 static int tx_abort(struct slgt_info *info)
2707 {
2708         unsigned long flags;
2709         DBGINFO(("%s tx_abort\n", info->device_name));
2710         spin_lock_irqsave(&info->lock,flags);
2711         tdma_reset(info);
2712         spin_unlock_irqrestore(&info->lock,flags);
2713         return 0;
2714 }
2715
2716 static int rx_enable(struct slgt_info *info, int enable)
2717 {
2718         unsigned long flags;
2719         unsigned int rbuf_fill_level;
2720         DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
2721         spin_lock_irqsave(&info->lock,flags);
2722         /*
2723          * enable[31..16] = receive DMA buffer fill level
2724          * 0 = noop (leave fill level unchanged)
2725          * fill level must be multiple of 4 and <= buffer size
2726          */
2727         rbuf_fill_level = ((unsigned int)enable) >> 16;
2728         if (rbuf_fill_level) {
2729                 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
2730                         spin_unlock_irqrestore(&info->lock, flags);
2731                         return -EINVAL;
2732                 }
2733                 info->rbuf_fill_level = rbuf_fill_level;
2734                 if (rbuf_fill_level < 128)
2735                         info->rx_pio = 1; /* PIO mode */
2736                 else
2737                         info->rx_pio = 0; /* DMA mode */
2738                 rx_stop(info); /* restart receiver to use new fill level */
2739         }
2740
2741         /*
2742          * enable[1..0] = receiver enable command
2743          * 0 = disable
2744          * 1 = enable
2745          * 2 = enable or force hunt mode if already enabled
2746          */
2747         enable &= 3;
2748         if (enable) {
2749                 if (!info->rx_enabled)
2750                         rx_start(info);
2751                 else if (enable == 2) {
2752                         /* force hunt mode (write 1 to RCR[3]) */
2753                         wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2754                 }
2755         } else {
2756                 if (info->rx_enabled)
2757                         rx_stop(info);
2758         }
2759         spin_unlock_irqrestore(&info->lock,flags);
2760         return 0;
2761 }
2762
2763 /*
2764  *  wait for specified event to occur
2765  */
2766 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2767 {
2768         unsigned long flags;
2769         int s;
2770         int rc=0;
2771         struct mgsl_icount cprev, cnow;
2772         int events;
2773         int mask;
2774         struct  _input_signal_events oldsigs, newsigs;
2775         DECLARE_WAITQUEUE(wait, current);
2776
2777         if (get_user(mask, mask_ptr))
2778                 return -EFAULT;
2779
2780         DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2781
2782         spin_lock_irqsave(&info->lock,flags);
2783
2784         /* return immediately if state matches requested events */
2785         get_signals(info);
2786         s = info->signals;
2787
2788         events = mask &
2789                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2790                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2791                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2792                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2793         if (events) {
2794                 spin_unlock_irqrestore(&info->lock,flags);
2795                 goto exit;
2796         }
2797
2798         /* save current irq counts */
2799         cprev = info->icount;
2800         oldsigs = info->input_signal_events;
2801
2802         /* enable hunt and idle irqs if needed */
2803         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2804                 unsigned short val = rd_reg16(info, SCR);
2805                 if (!(val & IRQ_RXIDLE))
2806                         wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2807         }
2808
2809         set_current_state(TASK_INTERRUPTIBLE);
2810         add_wait_queue(&info->event_wait_q, &wait);
2811
2812         spin_unlock_irqrestore(&info->lock,flags);
2813
2814         for(;;) {
2815                 schedule();
2816                 if (signal_pending(current)) {
2817                         rc = -ERESTARTSYS;
2818                         break;
2819                 }
2820
2821                 /* get current irq counts */
2822                 spin_lock_irqsave(&info->lock,flags);
2823                 cnow = info->icount;
2824                 newsigs = info->input_signal_events;
2825                 set_current_state(TASK_INTERRUPTIBLE);
2826                 spin_unlock_irqrestore(&info->lock,flags);
2827
2828                 /* if no change, wait aborted for some reason */
2829                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2830                     newsigs.dsr_down == oldsigs.dsr_down &&
2831                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2832                     newsigs.dcd_down == oldsigs.dcd_down &&
2833                     newsigs.cts_up   == oldsigs.cts_up   &&
2834                     newsigs.cts_down == oldsigs.cts_down &&
2835                     newsigs.ri_up    == oldsigs.ri_up    &&
2836                     newsigs.ri_down  == oldsigs.ri_down  &&
2837                     cnow.exithunt    == cprev.exithunt   &&
2838                     cnow.rxidle      == cprev.rxidle) {
2839                         rc = -EIO;
2840                         break;
2841                 }
2842
2843                 events = mask &
2844                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2845                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2846                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2847                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2848                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2849                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2850                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2851                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2852                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2853                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2854                 if (events)
2855                         break;
2856
2857                 cprev = cnow;
2858                 oldsigs = newsigs;
2859         }
2860
2861         remove_wait_queue(&info->event_wait_q, &wait);
2862         set_current_state(TASK_RUNNING);
2863
2864
2865         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2866                 spin_lock_irqsave(&info->lock,flags);
2867                 if (!waitqueue_active(&info->event_wait_q)) {
2868                         /* disable enable exit hunt mode/idle rcvd IRQs */
2869                         wr_reg16(info, SCR,
2870                                 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2871                 }
2872                 spin_unlock_irqrestore(&info->lock,flags);
2873         }
2874 exit:
2875         if (rc == 0)
2876                 rc = put_user(events, mask_ptr);
2877         return rc;
2878 }
2879
2880 static int get_interface(struct slgt_info *info, int __user *if_mode)
2881 {
2882         DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2883         if (put_user(info->if_mode, if_mode))
2884                 return -EFAULT;
2885         return 0;
2886 }
2887
2888 static int set_interface(struct slgt_info *info, int if_mode)
2889 {
2890         unsigned long flags;
2891         unsigned short val;
2892
2893         DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2894         spin_lock_irqsave(&info->lock,flags);
2895         info->if_mode = if_mode;
2896
2897         msc_set_vcr(info);
2898
2899         /* TCR (tx control) 07  1=RTS driver control */
2900         val = rd_reg16(info, TCR);
2901         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2902                 val |= BIT7;
2903         else
2904                 val &= ~BIT7;
2905         wr_reg16(info, TCR, val);
2906
2907         spin_unlock_irqrestore(&info->lock,flags);
2908         return 0;
2909 }
2910
2911 static int get_xsync(struct slgt_info *info, int __user *xsync)
2912 {
2913         DBGINFO(("%s get_xsync=%x\n", info->device_name, info->xsync));
2914         if (put_user(info->xsync, xsync))
2915                 return -EFAULT;
2916         return 0;
2917 }
2918
2919 /*
2920  * set extended sync pattern (1 to 4 bytes) for extended sync mode
2921  *
2922  * sync pattern is contained in least significant bytes of value
2923  * most significant byte of sync pattern is oldest (1st sent/detected)
2924  */
2925 static int set_xsync(struct slgt_info *info, int xsync)
2926 {
2927         unsigned long flags;
2928
2929         DBGINFO(("%s set_xsync=%x)\n", info->device_name, xsync));
2930         spin_lock_irqsave(&info->lock, flags);
2931         info->xsync = xsync;
2932         wr_reg32(info, XSR, xsync);
2933         spin_unlock_irqrestore(&info->lock, flags);
2934         return 0;
2935 }
2936
2937 static int get_xctrl(struct slgt_info *info, int __user *xctrl)
2938 {
2939         DBGINFO(("%s get_xctrl=%x\n", info->device_name, info->xctrl));
2940         if (put_user(info->xctrl, xctrl))
2941                 return -EFAULT;
2942         return 0;
2943 }
2944
2945 /*
2946  * set extended control options
2947  *
2948  * xctrl[31:19] reserved, must be zero
2949  * xctrl[18:17] extended sync pattern length in bytes
2950  *              00 = 1 byte  in xsr[7:0]
2951  *              01 = 2 bytes in xsr[15:0]
2952  *              10 = 3 bytes in xsr[23:0]
2953  *              11 = 4 bytes in xsr[31:0]
2954  * xctrl[16]    1 = enable terminal count, 0=disabled
2955  * xctrl[15:0]  receive terminal count for fixed length packets
2956  *              value is count minus one (0 = 1 byte packet)
2957  *              when terminal count is reached, receiver
2958  *              automatically returns to hunt mode and receive
2959  *              FIFO contents are flushed to DMA buffers with
2960  *              end of frame (EOF) status
2961  */
2962 static int set_xctrl(struct slgt_info *info, int xctrl)
2963 {
2964         unsigned long flags;
2965
2966         DBGINFO(("%s set_xctrl=%x)\n", info->device_name, xctrl));
2967         spin_lock_irqsave(&info->lock, flags);
2968         info->xctrl = xctrl;
2969         wr_reg32(info, XCR, xctrl);
2970         spin_unlock_irqrestore(&info->lock, flags);
2971         return 0;
2972 }
2973
2974 /*
2975  * set general purpose IO pin state and direction
2976  *
2977  * user_gpio fields:
2978  * state   each bit indicates a pin state
2979  * smask   set bit indicates pin state to set
2980  * dir     each bit indicates a pin direction (0=input, 1=output)
2981  * dmask   set bit indicates pin direction to set
2982  */
2983 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2984 {
2985         unsigned long flags;
2986         struct gpio_desc gpio;
2987         __u32 data;
2988
2989         if (!info->gpio_present)
2990                 return -EINVAL;
2991         if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2992                 return -EFAULT;
2993         DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2994                  info->device_name, gpio.state, gpio.smask,
2995                  gpio.dir, gpio.dmask));
2996
2997         spin_lock_irqsave(&info->port_array[0]->lock, flags);
2998         if (gpio.dmask) {
2999                 data = rd_reg32(info, IODR);
3000                 data |= gpio.dmask & gpio.dir;
3001                 data &= ~(gpio.dmask & ~gpio.dir);
3002                 wr_reg32(info, IODR, data);
3003         }
3004         if (gpio.smask) {
3005                 data = rd_reg32(info, IOVR);
3006                 data |= gpio.smask & gpio.state;
3007                 data &= ~(gpio.smask & ~gpio.state);
3008                 wr_reg32(info, IOVR, data);
3009         }
3010         spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3011
3012         return 0;
3013 }
3014
3015 /*
3016  * get general purpose IO pin state and direction
3017  */
3018 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
3019 {
3020         struct gpio_desc gpio;
3021         if (!info->gpio_present)
3022                 return -EINVAL;
3023         gpio.state = rd_reg32(info, IOVR);
3024         gpio.smask = 0xffffffff;
3025         gpio.dir   = rd_reg32(info, IODR);
3026         gpio.dmask = 0xffffffff;
3027         if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3028                 return -EFAULT;
3029         DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
3030                  info->device_name, gpio.state, gpio.dir));
3031         return 0;
3032 }
3033
3034 /*
3035  * conditional wait facility
3036  */
3037 static void init_cond_wait(struct cond_wait *w, unsigned int data)
3038 {
3039         init_waitqueue_head(&w->q);
3040         init_waitqueue_entry(&w->wait, current);
3041         w->data = data;
3042 }
3043
3044 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
3045 {
3046         set_current_state(TASK_INTERRUPTIBLE);
3047         add_wait_queue(&w->q, &w->wait);
3048         w->next = *head;
3049         *head = w;
3050 }
3051
3052 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
3053 {
3054         struct cond_wait *w, *prev;
3055         remove_wait_queue(&cw->q, &cw->wait);
3056         set_current_state(TASK_RUNNING);
3057         for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
3058                 if (w == cw) {
3059                         if (prev != NULL)
3060                                 prev->next = w->next;
3061                         else
3062                                 *head = w->next;
3063                         break;
3064                 }
3065         }
3066 }
3067
3068 static void flush_cond_wait(struct cond_wait **head)
3069 {
3070         while (*head != NULL) {
3071                 wake_up_interruptible(&(*head)->q);
3072                 *head = (*head)->next;
3073         }
3074 }
3075
3076 /*
3077  * wait for general purpose I/O pin(s) to enter specified state
3078  *
3079  * user_gpio fields:
3080  * state - bit indicates target pin state
3081  * smask - set bit indicates watched pin
3082  *
3083  * The wait ends when at least one watched pin enters the specified
3084  * state. When 0 (no error) is returned, user_gpio->state is set to the
3085  * state of all GPIO pins when the wait ends.
3086  *
3087  * Note: Each pin may be a dedicated input, dedicated output, or
3088  * configurable input/output. The number and configuration of pins
3089  * varies with the specific adapter model. Only input pins (dedicated
3090  * or configured) can be monitored with this function.
3091  */
3092 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
3093 {
3094         unsigned long flags;
3095         int rc = 0;
3096         struct gpio_desc gpio;
3097         struct cond_wait wait;
3098         u32 state;
3099
3100         if (!info->gpio_present)
3101                 return -EINVAL;
3102         if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
3103                 return -EFAULT;
3104         DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
3105                  info->device_name, gpio.state, gpio.smask));
3106         /* ignore output pins identified by set IODR bit */
3107         if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
3108                 return -EINVAL;
3109         init_cond_wait(&wait, gpio.smask);
3110
3111         spin_lock_irqsave(&info->port_array[0]->lock, flags);
3112         /* enable interrupts for watched pins */
3113         wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
3114         /* get current pin states */
3115         state = rd_reg32(info, IOVR);
3116
3117         if (gpio.smask & ~(state ^ gpio.state)) {
3118                 /* already in target state */
3119                 gpio.state = state;
3120         } else {
3121                 /* wait for target state */
3122                 add_cond_wait(&info->gpio_wait_q, &wait);
3123                 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3124                 schedule();
3125                 if (signal_pending(current))
3126                         rc = -ERESTARTSYS;
3127                 else
3128                         gpio.state = wait.data;
3129                 spin_lock_irqsave(&info->port_array[0]->lock, flags);
3130                 remove_cond_wait(&info->gpio_wait_q, &wait);
3131         }
3132
3133         /* disable all GPIO interrupts if no waiting processes */
3134         if (info->gpio_wait_q == NULL)
3135                 wr_reg32(info, IOER, 0);
3136         spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3137
3138         if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3139                 rc = -EFAULT;
3140         return rc;
3141 }
3142
3143 static int modem_input_wait(struct slgt_info *info,int arg)
3144 {
3145         unsigned long flags;
3146         int rc;
3147         struct mgsl_icount cprev, cnow;
3148         DECLARE_WAITQUEUE(wait, current);
3149
3150         /* save current irq counts */
3151         spin_lock_irqsave(&info->lock,flags);
3152         cprev = info->icount;
3153         add_wait_queue(&info->status_event_wait_q, &wait);
3154         set_current_state(TASK_INTERRUPTIBLE);
3155         spin_unlock_irqrestore(&info->lock,flags);
3156
3157         for(;;) {
3158                 schedule();
3159                 if (signal_pending(current)) {
3160                         rc = -ERESTARTSYS;
3161                         break;
3162                 }
3163
3164                 /* get new irq counts */
3165                 spin_lock_irqsave(&info->lock,flags);
3166                 cnow = info->icount;
3167                 set_current_state(TASK_INTERRUPTIBLE);
3168                 spin_unlock_irqrestore(&info->lock,flags);
3169
3170                 /* if no change, wait aborted for some reason */
3171                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3172                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3173                         rc = -EIO;
3174                         break;
3175                 }
3176
3177                 /* check for change in caller specified modem input */
3178                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3179                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3180                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3181                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3182                         rc = 0;
3183                         break;
3184                 }
3185
3186                 cprev = cnow;
3187         }
3188         remove_wait_queue(&info->status_event_wait_q, &wait);
3189         set_current_state(TASK_RUNNING);
3190         return rc;
3191 }
3192
3193 /*
3194  *  return state of serial control and status signals
3195  */
3196 static int tiocmget(struct tty_struct *tty)
3197 {
3198         struct slgt_info *info = tty->driver_data;
3199         unsigned int result;
3200         unsigned long flags;
3201
3202         spin_lock_irqsave(&info->lock,flags);
3203         get_signals(info);
3204         spin_unlock_irqrestore(&info->lock,flags);
3205
3206         result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3207                 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3208                 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3209                 ((info->signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
3210                 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3211                 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3212
3213         DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3214         return result;
3215 }
3216
3217 /*
3218  * set modem control signals (DTR/RTS)
3219  *
3220  *      cmd     signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3221  *              TIOCMSET = set/clear signal values
3222  *      value   bit mask for command
3223  */
3224 static int tiocmset(struct tty_struct *tty,
3225                     unsigned int set, unsigned int clear)
3226 {
3227         struct slgt_info *info = tty->driver_data;
3228         unsigned long flags;
3229
3230         DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3231
3232         if (set & TIOCM_RTS)
3233                 info->signals |= SerialSignal_RTS;
3234         if (set & TIOCM_DTR)
3235                 info->signals |= SerialSignal_DTR;
3236         if (clear & TIOCM_RTS)
3237                 info->signals &= ~SerialSignal_RTS;
3238         if (clear & TIOCM_DTR)
3239                 info->signals &= ~SerialSignal_DTR;
3240
3241         spin_lock_irqsave(&info->lock,flags);
3242         set_signals(info);
3243         spin_unlock_irqrestore(&info->lock,flags);
3244         return 0;
3245 }
3246
3247 static int carrier_raised(struct tty_port *port)
3248 {
3249         unsigned long flags;
3250         struct slgt_info *info = container_of(port, struct slgt_info, port);
3251
3252         spin_lock_irqsave(&info->lock,flags);
3253         get_signals(info);
3254         spin_unlock_irqrestore(&info->lock,flags);
3255         return (info->signals & SerialSignal_DCD) ? 1 : 0;
3256 }
3257
3258 static void dtr_rts(struct tty_port *port, int on)
3259 {
3260         unsigned long flags;
3261         struct slgt_info *info = container_of(port, struct slgt_info, port);
3262
3263         spin_lock_irqsave(&info->lock,flags);
3264         if (on)
3265                 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
3266         else
3267                 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3268         set_signals(info);
3269         spin_unlock_irqrestore(&info->lock,flags);
3270 }
3271
3272
3273 /*
3274  *  block current process until the device is ready to open
3275  */
3276 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3277                            struct slgt_info *info)
3278 {
3279         DECLARE_WAITQUEUE(wait, current);
3280         int             retval;
3281         bool            do_clocal = false;
3282         bool            extra_count = false;
3283         unsigned long   flags;
3284         int             cd;
3285         struct tty_port *port = &info->port;
3286
3287         DBGINFO(("%s block_til_ready\n", tty->driver->name));
3288
3289         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3290                 /* nonblock mode is set or port is not enabled */
3291                 port->flags |= ASYNC_NORMAL_ACTIVE;
3292                 return 0;
3293         }
3294
3295         if (tty->termios.c_cflag & CLOCAL)
3296                 do_clocal = true;
3297
3298         /* Wait for carrier detect and the line to become
3299          * free (i.e., not in use by the callout).  While we are in
3300          * this loop, port->count is dropped by one, so that
3301          * close() knows when to free things.  We restore it upon
3302          * exit, either normal or abnormal.
3303          */
3304
3305         retval = 0;
3306         add_wait_queue(&port->open_wait, &wait);
3307
3308         spin_lock_irqsave(&info->lock, flags);
3309         if (!tty_hung_up_p(filp)) {
3310                 extra_count = true;
3311                 port->count--;
3312         }
3313         spin_unlock_irqrestore(&info->lock, flags);
3314         port->blocked_open++;
3315
3316         while (1) {
3317                 if ((tty->termios.c_cflag & CBAUD))
3318                         tty_port_raise_dtr_rts(port);
3319
3320                 set_current_state(TASK_INTERRUPTIBLE);
3321
3322                 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3323                         retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3324                                         -EAGAIN : -ERESTARTSYS;
3325                         break;
3326                 }
3327
3328                 cd = tty_port_carrier_raised(port);
3329
3330                 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd ))
3331                         break;
3332
3333                 if (signal_pending(current)) {
3334                         retval = -ERESTARTSYS;
3335                         break;
3336                 }
3337
3338                 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3339                 tty_unlock(tty);
3340                 schedule();
3341                 tty_lock(tty);
3342         }
3343
3344         set_current_state(TASK_RUNNING);
3345         remove_wait_queue(&port->open_wait, &wait);
3346
3347         if (extra_count)
3348                 port->count++;
3349         port->blocked_open--;
3350
3351         if (!retval)
3352                 port->flags |= ASYNC_NORMAL_ACTIVE;
3353
3354         DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3355         return retval;
3356 }
3357
3358 static int alloc_tmp_rbuf(struct slgt_info *info)
3359 {
3360         info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3361         if (info->tmp_rbuf == NULL)
3362                 return -ENOMEM;
3363         return 0;
3364 }
3365
3366 static void free_tmp_rbuf(struct slgt_info *info)
3367 {
3368         kfree(info->tmp_rbuf);
3369         info->tmp_rbuf = NULL;
3370 }
3371
3372 /*
3373  * allocate DMA descriptor lists.
3374  */
3375 static int alloc_desc(struct slgt_info *info)
3376 {
3377         unsigned int i;
3378         unsigned int pbufs;
3379
3380         /* allocate memory to hold descriptor lists */
3381         info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr);
3382         if (info->bufs == NULL)
3383                 return -ENOMEM;
3384
3385         memset(info->bufs, 0, DESC_LIST_SIZE);
3386
3387         info->rbufs = (struct slgt_desc*)info->bufs;
3388         info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3389
3390         pbufs = (unsigned int)info->bufs_dma_addr;
3391
3392         /*
3393          * Build circular lists of descriptors
3394          */
3395
3396         for (i=0; i < info->rbuf_count; i++) {
3397                 /* physical address of this descriptor */
3398                 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3399
3400                 /* physical address of next descriptor */
3401                 if (i == info->rbuf_count - 1)
3402                         info->rbufs[i].next = cpu_to_le32(pbufs);
3403                 else
3404                         info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3405                 set_desc_count(info->rbufs[i], DMABUFSIZE);
3406         }
3407
3408         for (i=0; i < info->tbuf_count; i++) {
3409                 /* physical address of this descriptor */
3410                 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3411
3412                 /* physical address of next descriptor */
3413                 if (i == info->tbuf_count - 1)
3414                         info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3415                 else
3416                         info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3417         }
3418
3419         return 0;
3420 }
3421
3422 static void free_desc(struct slgt_info *info)
3423 {
3424         if (info->bufs != NULL) {
3425                 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3426                 info->bufs  = NULL;
3427                 info->rbufs = NULL;
3428                 info->tbufs = NULL;
3429         }
3430 }
3431
3432 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3433 {
3434         int i;
3435         for (i=0; i < count; i++) {
3436                 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3437                         return -ENOMEM;
3438                 bufs[i].pbuf  = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3439         }
3440         return 0;
3441 }
3442
3443 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3444 {
3445         int i;
3446         for (i=0; i < count; i++) {
3447                 if (bufs[i].buf == NULL)
3448                         continue;
3449                 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3450                 bufs[i].buf = NULL;
3451         }
3452 }
3453
3454 static int alloc_dma_bufs(struct slgt_info *info)
3455 {
3456         info->rbuf_count = 32;
3457         info->tbuf_count = 32;
3458
3459         if (alloc_desc(info) < 0 ||
3460             alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3461             alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3462             alloc_tmp_rbuf(info) < 0) {
3463                 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3464                 return -ENOMEM;
3465         }
3466         reset_rbufs(info);
3467         return 0;
3468 }
3469
3470 static void free_dma_bufs(struct slgt_info *info)
3471 {
3472         if (info->bufs) {
3473                 free_bufs(info, info->rbufs, info->rbuf_count);
3474                 free_bufs(info, info->tbufs, info->tbuf_count);
3475                 free_desc(info);
3476         }
3477         free_tmp_rbuf(info);
3478 }
3479
3480 static int claim_resources(struct slgt_info *info)
3481 {
3482         if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3483                 DBGERR(("%s reg addr conflict, addr=%08X\n",
3484                         info->device_name, info->phys_reg_addr));
3485                 info->init_error = DiagStatus_AddressConflict;
3486                 goto errout;
3487         }
3488         else
3489                 info->reg_addr_requested = true;
3490
3491         info->reg_addr = ioremap_nocache(info->phys_reg_addr, SLGT_REG_SIZE);
3492         if (!info->reg_addr) {
3493                 DBGERR(("%s can't map device registers, addr=%08X\n",
3494                         info->device_name, info->phys_reg_addr));
3495                 info->init_error = DiagStatus_CantAssignPciResources;
3496                 goto errout;
3497         }
3498         return 0;
3499
3500 errout:
3501         release_resources(info);
3502         return -ENODEV;
3503 }
3504
3505 static void release_resources(struct slgt_info *info)
3506 {
3507         if (info->irq_requested) {
3508                 free_irq(info->irq_level, info);
3509                 info->irq_requested = false;
3510         }
3511
3512         if (info->reg_addr_requested) {
3513                 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3514                 info->reg_addr_requested = false;
3515         }
3516
3517         if (info->reg_addr) {
3518                 iounmap(info->reg_addr);
3519                 info->reg_addr = NULL;
3520         }
3521 }
3522
3523 /* Add the specified device instance data structure to the
3524  * global linked list of devices and increment the device count.
3525  */
3526 static void add_device(struct slgt_info *info)
3527 {
3528         char *devstr;
3529
3530         info->next_device = NULL;
3531         info->line = slgt_device_count;
3532         sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3533
3534         if (info->line < MAX_DEVICES) {
3535                 if (maxframe[info->line])
3536                         info->max_frame_size = maxframe[info->line];
3537         }
3538
3539         slgt_device_count++;
3540
3541         if (!slgt_device_list)
3542                 slgt_device_list = info;
3543         else {
3544                 struct slgt_info *current_dev = slgt_device_list;
3545                 while(current_dev->next_device)
3546                         current_dev = current_dev->next_device;
3547                 current_dev->next_device = info;
3548         }
3549
3550         if (info->max_frame_size < 4096)
3551                 info->max_frame_size = 4096;
3552         else if (info->max_frame_size > 65535)
3553                 info->max_frame_size = 65535;
3554
3555         switch(info->pdev->device) {
3556         case SYNCLINK_GT_DEVICE_ID:
3557                 devstr = "GT";
3558                 break;
3559         case SYNCLINK_GT2_DEVICE_ID:
3560                 devstr = "GT2";
3561                 break;
3562         case SYNCLINK_GT4_DEVICE_ID:
3563                 devstr = "GT4";
3564                 break;
3565         case SYNCLINK_AC_DEVICE_ID:
3566                 devstr = "AC";
3567                 info->params.mode = MGSL_MODE_ASYNC;
3568                 break;
3569         default:
3570                 devstr = "(unknown model)";
3571         }
3572         printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3573                 devstr, info->device_name, info->phys_reg_addr,
3574                 info->irq_level, info->max_frame_size);
3575
3576 #if SYNCLINK_GENERIC_HDLC
3577         hdlcdev_init(info);
3578 #endif
3579 }
3580
3581 static const struct tty_port_operations slgt_port_ops = {
3582         .carrier_raised = carrier_raised,
3583         .dtr_rts = dtr_rts,
3584 };
3585
3586 /*
3587  *  allocate device instance structure, return NULL on failure
3588  */
3589 static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3590 {
3591         struct slgt_info *info;
3592
3593         info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
3594
3595         if (!info) {
3596                 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3597                         driver_name, adapter_num, port_num));
3598         } else {
3599                 tty_port_init(&info->port);
3600                 info->port.ops = &slgt_port_ops;
3601                 info->magic = MGSL_MAGIC;
3602                 INIT_WORK(&info->task, bh_handler);
3603                 info->max_frame_size = 4096;
3604                 info->base_clock = 14745600;
3605                 info->rbuf_fill_level = DMABUFSIZE;
3606                 info->port.close_delay = 5*HZ/10;
3607                 info->port.closing_wait = 30*HZ;
3608                 init_waitqueue_head(&info->status_event_wait_q);
3609                 init_waitqueue_head(&info->event_wait_q);
3610                 spin_lock_init(&info->netlock);
3611                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3612                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3613                 info->adapter_num = adapter_num;
3614                 info->port_num = port_num;
3615
3616                 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3617                 setup_timer(&info->rx_timer, rx_timeout, (unsigned long)info);
3618
3619                 /* Copy configuration info to device instance data */
3620                 info->pdev = pdev;
3621                 info->irq_level = pdev->irq;
3622                 info->phys_reg_addr = pci_resource_start(pdev,0);
3623
3624                 info->bus_type = MGSL_BUS_TYPE_PCI;
3625                 info->irq_flags = IRQF_SHARED;
3626
3627                 info->init_error = -1; /* assume error, set to 0 on successful init */
3628         }
3629
3630         return info;
3631 }
3632
3633 static void device_init(int adapter_num, struct pci_dev *pdev)
3634 {
3635         struct slgt_info *port_array[SLGT_MAX_PORTS];
3636         int i;
3637         int port_count = 1;
3638
3639         if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3640                 port_count = 2;
3641         else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3642                 port_count = 4;
3643
3644         /* allocate device instances for all ports */
3645         for (i=0; i < port_count; ++i) {
3646                 port_array[i] = alloc_dev(adapter_num, i, pdev);
3647                 if (port_array[i] == NULL) {
3648                         for (--i; i >= 0; --i) {
3649                                 tty_port_destroy(&port_array[i]->port);
3650                                 kfree(port_array[i]);
3651                         }
3652                         return;
3653                 }
3654         }
3655
3656         /* give copy of port_array to all ports and add to device list  */
3657         for (i=0; i < port_count; ++i) {
3658                 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3659                 add_device(port_array[i]);
3660                 port_array[i]->port_count = port_count;
3661                 spin_lock_init(&port_array[i]->lock);
3662         }
3663
3664         /* Allocate and claim adapter resources */
3665         if (!claim_resources(port_array[0])) {
3666
3667                 alloc_dma_bufs(port_array[0]);
3668
3669                 /* copy resource information from first port to others */
3670                 for (i = 1; i < port_count; ++i) {
3671                         port_array[i]->irq_level = port_array[0]->irq_level;
3672                         port_array[i]->reg_addr  = port_array[0]->reg_addr;
3673                         alloc_dma_bufs(port_array[i]);
3674                 }
3675
3676                 if (request_irq(port_array[0]->irq_level,
3677                                         slgt_interrupt,
3678                                         port_array[0]->irq_flags,
3679                                         port_array[0]->device_name,
3680                                         port_array[0]) < 0) {
3681                         DBGERR(("%s request_irq failed IRQ=%d\n",
3682                                 port_array[0]->device_name,
3683                                 port_array[0]->irq_level));
3684                 } else {
3685                         port_array[0]->irq_requested = true;
3686                         adapter_test(port_array[0]);
3687                         for (i=1 ; i < port_count ; i++) {
3688                                 port_array[i]->init_error = port_array[0]->init_error;
3689                                 port_array[i]->gpio_present = port_array[0]->gpio_present;
3690                         }
3691                 }
3692         }
3693
3694         for (i = 0; i < port_count; ++i) {
3695                 struct slgt_info *info = port_array[i];
3696                 tty_port_register_device(&info->port, serial_driver, info->line,
3697                                 &info->pdev->dev);
3698         }
3699 }
3700
3701 static int __devinit init_one(struct pci_dev *dev,
3702                               const struct pci_device_id *ent)
3703 {
3704         if (pci_enable_device(dev)) {
3705                 printk("error enabling pci device %p\n", dev);
3706                 return -EIO;
3707         }
3708         pci_set_master(dev);
3709         device_init(slgt_device_count, dev);
3710         return 0;
3711 }
3712
3713 static void __devexit remove_one(struct pci_dev *dev)
3714 {
3715 }
3716
3717 static const struct tty_operations ops = {
3718         .open = open,
3719         .close = close,
3720         .write = write,
3721         .put_char = put_char,
3722         .flush_chars = flush_chars,
3723         .write_room = write_room,
3724         .chars_in_buffer = chars_in_buffer,
3725         .flush_buffer = flush_buffer,
3726         .ioctl = ioctl,
3727         .compat_ioctl = slgt_compat_ioctl,
3728         .throttle = throttle,
3729         .unthrottle = unthrottle,
3730         .send_xchar = send_xchar,
3731         .break_ctl = set_break,
3732         .wait_until_sent = wait_until_sent,
3733         .set_termios = set_termios,
3734         .stop = tx_hold,
3735         .start = tx_release,
3736         .hangup = hangup,
3737         .tiocmget = tiocmget,
3738         .tiocmset = tiocmset,
3739         .get_icount = get_icount,
3740         .proc_fops = &synclink_gt_proc_fops,
3741 };
3742
3743 static void slgt_cleanup(void)
3744 {
3745         int rc;
3746         struct slgt_info *info;
3747         struct slgt_info *tmp;
3748
3749         printk(KERN_INFO "unload %s\n", driver_name);
3750
3751         if (serial_driver) {
3752                 for (info=slgt_device_list ; info != NULL ; info=info->next_device)
3753                         tty_unregister_device(serial_driver, info->line);
3754                 if ((rc = tty_unregister_driver(serial_driver)))
3755                         DBGERR(("tty_unregister_driver error=%d\n", rc));
3756                 put_tty_driver(serial_driver);
3757         }
3758
3759         /* reset devices */
3760         info = slgt_device_list;
3761         while(info) {
3762                 reset_port(info);
3763                 info = info->next_device;
3764         }
3765
3766         /* release devices */
3767         info = slgt_device_list;
3768         while(info) {
3769 #if SYNCLINK_GENERIC_HDLC
3770                 hdlcdev_exit(info);
3771 #endif
3772                 free_dma_bufs(info);
3773                 free_tmp_rbuf(info);
3774                 if (info->port_num == 0)
3775                         release_resources(info);
3776                 tmp = info;
3777                 info = info->next_device;
3778                 tty_port_destroy(&tmp->port);
3779                 kfree(tmp);
3780         }
3781
3782         if (pci_registered)
3783                 pci_unregister_driver(&pci_driver);
3784 }
3785
3786 /*
3787  *  Driver initialization entry point.
3788  */
3789 static int __init slgt_init(void)
3790 {
3791         int rc;
3792
3793         printk(KERN_INFO "%s\n", driver_name);
3794
3795         serial_driver = alloc_tty_driver(MAX_DEVICES);
3796         if (!serial_driver) {
3797                 printk("%s can't allocate tty driver\n", driver_name);
3798                 return -ENOMEM;
3799         }
3800
3801         /* Initialize the tty_driver structure */
3802
3803         serial_driver->driver_name = tty_driver_name;
3804         serial_driver->name = tty_dev_prefix;
3805         serial_driver->major = ttymajor;
3806         serial_driver->minor_start = 64;
3807         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3808         serial_driver->subtype = SERIAL_TYPE_NORMAL;
3809         serial_driver->init_termios = tty_std_termios;
3810         serial_driver->init_termios.c_cflag =
3811                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3812         serial_driver->init_termios.c_ispeed = 9600;
3813         serial_driver->init_termios.c_ospeed = 9600;
3814         serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3815         tty_set_operations(serial_driver, &ops);
3816         if ((rc = tty_register_driver(serial_driver)) < 0) {
3817                 DBGERR(("%s can't register serial driver\n", driver_name));
3818                 put_tty_driver(serial_driver);
3819                 serial_driver = NULL;
3820                 goto error;
3821         }
3822
3823         printk(KERN_INFO "%s, tty major#%d\n",
3824                driver_name, serial_driver->major);
3825
3826         slgt_device_count = 0;
3827         if ((rc = pci_register_driver(&pci_driver)) < 0) {
3828                 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3829                 goto error;
3830         }
3831         pci_registered = true;
3832
3833         if (!slgt_device_list)
3834                 printk("%s no devices found\n",driver_name);
3835
3836         return 0;
3837
3838 error:
3839         slgt_cleanup();
3840         return rc;
3841 }
3842
3843 static void __exit slgt_exit(void)
3844 {
3845         slgt_cleanup();
3846 }
3847
3848 module_init(slgt_init);
3849 module_exit(slgt_exit);
3850
3851 /*
3852  * register access routines
3853  */
3854
3855 #define CALC_REGADDR() \
3856         unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3857         if (addr >= 0x80) \
3858                 reg_addr += (info->port_num) * 32; \
3859         else if (addr >= 0x40)  \
3860                 reg_addr += (info->port_num) * 16;
3861
3862 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3863 {
3864         CALC_REGADDR();
3865         return readb((void __iomem *)reg_addr);
3866 }
3867
3868 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3869 {
3870         CALC_REGADDR();
3871         writeb(value, (void __iomem *)reg_addr);
3872 }
3873
3874 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3875 {
3876         CALC_REGADDR();
3877         return readw((void __iomem *)reg_addr);
3878 }
3879
3880 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3881 {
3882         CALC_REGADDR();
3883         writew(value, (void __iomem *)reg_addr);
3884 }
3885
3886 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3887 {
3888         CALC_REGADDR();
3889         return readl((void __iomem *)reg_addr);
3890 }
3891
3892 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3893 {
3894         CALC_REGADDR();
3895         writel(value, (void __iomem *)reg_addr);
3896 }
3897
3898 static void rdma_reset(struct slgt_info *info)
3899 {
3900         unsigned int i;
3901
3902         /* set reset bit */
3903         wr_reg32(info, RDCSR, BIT1);
3904
3905         /* wait for enable bit cleared */
3906         for(i=0 ; i < 1000 ; i++)
3907                 if (!(rd_reg32(info, RDCSR) & BIT0))
3908                         break;
3909 }
3910
3911 static void tdma_reset(struct slgt_info *info)
3912 {
3913         unsigned int i;
3914
3915         /* set reset bit */
3916         wr_reg32(info, TDCSR, BIT1);
3917
3918         /* wait for enable bit cleared */
3919         for(i=0 ; i < 1000 ; i++)
3920                 if (!(rd_reg32(info, TDCSR) & BIT0))
3921                         break;
3922 }
3923
3924 /*
3925  * enable internal loopback
3926  * TxCLK and RxCLK are generated from BRG
3927  * and TxD is looped back to RxD internally.
3928  */
3929 static void enable_loopback(struct slgt_info *info)
3930 {
3931         /* SCR (serial control) BIT2=loopback enable */
3932         wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3933
3934         if (info->params.mode != MGSL_MODE_ASYNC) {
3935                 /* CCR (clock control)
3936                  * 07..05  tx clock source (010 = BRG)
3937                  * 04..02  rx clock source (010 = BRG)
3938                  * 01      auxclk enable   (0 = disable)
3939                  * 00      BRG enable      (1 = enable)
3940                  *
3941                  * 0100 1001
3942                  */
3943                 wr_reg8(info, CCR, 0x49);
3944
3945                 /* set speed if available, otherwise use default */
3946                 if (info->params.clock_speed)
3947                         set_rate(info, info->params.clock_speed);
3948                 else
3949                         set_rate(info, 3686400);
3950         }
3951 }
3952
3953 /*
3954  *  set baud rate generator to specified rate
3955  */
3956 static void set_rate(struct slgt_info *info, u32 rate)
3957 {
3958         unsigned int div;
3959         unsigned int osc = info->base_clock;
3960
3961         /* div = osc/rate - 1
3962          *
3963          * Round div up if osc/rate is not integer to
3964          * force to next slowest rate.
3965          */
3966
3967         if (rate) {
3968                 div = osc/rate;
3969                 if (!(osc % rate) && div)
3970                         div--;
3971                 wr_reg16(info, BDR, (unsigned short)div);
3972         }
3973 }
3974
3975 static void rx_stop(struct slgt_info *info)
3976 {
3977         unsigned short val;
3978
3979         /* disable and reset receiver */
3980         val = rd_reg16(info, RCR) & ~BIT1;          /* clear enable bit */
3981         wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3982         wr_reg16(info, RCR, val);                  /* clear reset bit */
3983
3984         slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3985
3986         /* clear pending rx interrupts */
3987         wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3988
3989         rdma_reset(info);
3990
3991         info->rx_enabled = false;
3992         info->rx_restart = false;
3993 }
3994
3995 static void rx_start(struct slgt_info *info)
3996 {
3997         unsigned short val;
3998
3999         slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
4000
4001         /* clear pending rx overrun IRQ */
4002         wr_reg16(info, SSR, IRQ_RXOVER);
4003
4004         /* reset and disable receiver */
4005         val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
4006         wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
4007         wr_reg16(info, RCR, val);                  /* clear reset bit */
4008
4009         rdma_reset(info);
4010         reset_rbufs(info);
4011
4012         if (info->rx_pio) {
4013                 /* rx request when rx FIFO not empty */
4014                 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) & ~BIT14));
4015                 slgt_irq_on(info, IRQ_RXDATA);
4016                 if (info->params.mode == MGSL_MODE_ASYNC) {
4017                         /* enable saving of rx status */
4018                         wr_reg32(info, RDCSR, BIT6);
4019                 }
4020         } else {
4021                 /* rx request when rx FIFO half full */
4022                 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT14));
4023                 /* set 1st descriptor address */
4024                 wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
4025
4026                 if (info->params.mode != MGSL_MODE_ASYNC) {
4027                         /* enable rx DMA and DMA interrupt */
4028                         wr_reg32(info, RDCSR, (BIT2 + BIT0));
4029                 } else {
4030                         /* enable saving of rx status, rx DMA and DMA interrupt */
4031                         wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
4032                 }
4033         }
4034
4035         slgt_irq_on(info, IRQ_RXOVER);
4036
4037         /* enable receiver */
4038         wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
4039
4040         info->rx_restart = false;
4041         info->rx_enabled = true;
4042 }
4043
4044 static void tx_start(struct slgt_info *info)
4045 {
4046         if (!info->tx_enabled) {
4047                 wr_reg16(info, TCR,
4048                          (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
4049                 info->tx_enabled = true;
4050         }
4051
4052         if (desc_count(info->tbufs[info->tbuf_start])) {
4053                 info->drop_rts_on_tx_done = false;
4054
4055                 if (info->params.mode != MGSL_MODE_ASYNC) {
4056                         if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
4057                                 get_signals(info);
4058                                 if (!(info->signals & SerialSignal_RTS)) {
4059                                         info->signals |= SerialSignal_RTS;
4060                                         set_signals(info);
4061                                         info->drop_rts_on_tx_done = true;
4062                                 }
4063                         }
4064
4065                         slgt_irq_off(info, IRQ_TXDATA);
4066                         slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
4067                         /* clear tx idle and underrun status bits */
4068                         wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
4069                 } else {
4070                         slgt_irq_off(info, IRQ_TXDATA);
4071                         slgt_irq_on(info, IRQ_TXIDLE);
4072                         /* clear tx idle status bit */
4073                         wr_reg16(info, SSR, IRQ_TXIDLE);
4074                 }
4075                 /* set 1st descriptor address and start DMA */
4076                 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
4077                 wr_reg32(info, TDCSR, BIT2 + BIT0);
4078                 info->tx_active = true;
4079         }
4080 }
4081
4082 static void tx_stop(struct slgt_info *info)
4083 {
4084         unsigned short val;
4085
4086         del_timer(&info->tx_timer);
4087
4088         tdma_reset(info);
4089
4090         /* reset and disable transmitter */
4091         val = rd_reg16(info, TCR) & ~BIT1;          /* clear enable bit */
4092         wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
4093
4094         slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
4095
4096         /* clear tx idle and underrun status bit */
4097         wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
4098
4099         reset_tbufs(info);
4100
4101         info->tx_enabled = false;
4102         info->tx_active = false;
4103 }
4104
4105 static void reset_port(struct slgt_info *info)
4106 {
4107         if (!info->reg_addr)
4108                 return;
4109
4110         tx_stop(info);
4111         rx_stop(info);
4112
4113         info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
4114         set_signals(info);
4115
4116         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4117 }
4118
4119 static void reset_adapter(struct slgt_info *info)
4120 {
4121         int i;
4122         for (i=0; i < info->port_count; ++i) {
4123                 if (info->port_array[i])
4124                         reset_port(info->port_array[i]);
4125         }
4126 }
4127
4128 static void async_mode(struct slgt_info *info)
4129 {
4130         unsigned short val;
4131
4132         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4133         tx_stop(info);
4134         rx_stop(info);
4135
4136         /* TCR (tx control)
4137          *
4138          * 15..13  mode, 010=async
4139          * 12..10  encoding, 000=NRZ
4140          * 09      parity enable
4141          * 08      1=odd parity, 0=even parity
4142          * 07      1=RTS driver control
4143          * 06      1=break enable
4144          * 05..04  character length
4145          *         00=5 bits
4146          *         01=6 bits
4147          *         10=7 bits
4148          *         11=8 bits
4149          * 03      0=1 stop bit, 1=2 stop bits
4150          * 02      reset
4151          * 01      enable
4152          * 00      auto-CTS enable
4153          */
4154         val = 0x4000;
4155
4156         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4157                 val |= BIT7;
4158
4159         if (info->params.parity != ASYNC_PARITY_NONE) {
4160                 val |= BIT9;
4161                 if (info->params.parity == ASYNC_PARITY_ODD)
4162                         val |= BIT8;
4163         }
4164
4165         switch (info->params.data_bits)
4166         {
4167         case 6: val |= BIT4; break;
4168         case 7: val |= BIT5; break;
4169         case 8: val |= BIT5 + BIT4; break;
4170         }
4171
4172         if (info->params.stop_bits != 1)
4173                 val |= BIT3;
4174
4175         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4176                 val |= BIT0;
4177
4178         wr_reg16(info, TCR, val);
4179
4180         /* RCR (rx control)
4181          *
4182          * 15..13  mode, 010=async
4183          * 12..10  encoding, 000=NRZ
4184          * 09      parity enable
4185          * 08      1=odd parity, 0=even parity
4186          * 07..06  reserved, must be 0
4187          * 05..04  character length
4188          *         00=5 bits
4189          *         01=6 bits
4190          *         10=7 bits
4191          *         11=8 bits
4192          * 03      reserved, must be zero
4193          * 02      reset
4194          * 01      enable
4195          * 00      auto-DCD enable
4196          */
4197         val = 0x4000;
4198
4199         if (info->params.parity != ASYNC_PARITY_NONE) {
4200                 val |= BIT9;
4201                 if (info->params.parity == ASYNC_PARITY_ODD)
4202                         val |= BIT8;
4203         }
4204
4205         switch (info->params.data_bits)
4206         {
4207         case 6: val |= BIT4; break;
4208         case 7: val |= BIT5; break;
4209         case 8: val |= BIT5 + BIT4; break;
4210         }
4211
4212         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4213                 val |= BIT0;
4214
4215         wr_reg16(info, RCR, val);
4216
4217         /* CCR (clock control)
4218          *
4219          * 07..05  011 = tx clock source is BRG/16
4220          * 04..02  010 = rx clock source is BRG
4221          * 01      0 = auxclk disabled
4222          * 00      1 = BRG enabled
4223          *
4224          * 0110 1001
4225          */
4226         wr_reg8(info, CCR, 0x69);
4227
4228         msc_set_vcr(info);
4229
4230         /* SCR (serial control)
4231          *
4232          * 15  1=tx req on FIFO half empty
4233          * 14  1=rx req on FIFO half full
4234          * 13  tx data  IRQ enable
4235          * 12  tx idle  IRQ enable
4236          * 11  rx break on IRQ enable
4237          * 10  rx data  IRQ enable
4238          * 09  rx break off IRQ enable
4239          * 08  overrun  IRQ enable
4240          * 07  DSR      IRQ enable
4241          * 06  CTS      IRQ enable
4242          * 05  DCD      IRQ enable
4243          * 04  RI       IRQ enable
4244          * 03  0=16x sampling, 1=8x sampling
4245          * 02  1=txd->rxd internal loopback enable
4246          * 01  reserved, must be zero
4247          * 00  1=master IRQ enable
4248          */
4249         val = BIT15 + BIT14 + BIT0;
4250         /* JCR[8] : 1 = x8 async mode feature available */
4251         if ((rd_reg32(info, JCR) & BIT8) && info->params.data_rate &&
4252             ((info->base_clock < (info->params.data_rate * 16)) ||
4253              (info->base_clock % (info->params.data_rate * 16)))) {
4254                 /* use 8x sampling */
4255                 val |= BIT3;
4256                 set_rate(info, info->params.data_rate * 8);
4257         } else {
4258                 /* use 16x sampling */
4259                 set_rate(info, info->params.data_rate * 16);
4260         }
4261         wr_reg16(info, SCR, val);
4262
4263         slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
4264
4265         if (info->params.loopback)
4266                 enable_loopback(info);
4267 }
4268
4269 static void sync_mode(struct slgt_info *info)
4270 {
4271         unsigned short val;
4272
4273         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4274         tx_stop(info);
4275         rx_stop(info);
4276
4277         /* TCR (tx control)
4278          *
4279          * 15..13  mode
4280          *         000=HDLC/SDLC
4281          *         001=raw bit synchronous
4282          *         010=asynchronous/isochronous
4283          *         011=monosync byte synchronous
4284          *         100=bisync byte synchronous
4285          *         101=xsync byte synchronous
4286          * 12..10  encoding
4287          * 09      CRC enable
4288          * 08      CRC32
4289          * 07      1=RTS driver control
4290          * 06      preamble enable
4291          * 05..04  preamble length
4292          * 03      share open/close flag
4293          * 02      reset
4294          * 01      enable
4295          * 00      auto-CTS enable
4296          */
4297         val = BIT2;
4298
4299         switch(info->params.mode) {
4300         case MGSL_MODE_XSYNC:
4301                 val |= BIT15 + BIT13;
4302                 break;
4303         case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4304         case MGSL_MODE_BISYNC:   val |= BIT15; break;
4305         case MGSL_MODE_RAW:      val |= BIT13; break;
4306         }
4307         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4308                 val |= BIT7;
4309
4310         switch(info->params.encoding)
4311         {
4312         case HDLC_ENCODING_NRZB:          val |= BIT10; break;
4313         case HDLC_ENCODING_NRZI_MARK:     val |= BIT11; break;
4314         case HDLC_ENCODING_NRZI:          val |= BIT11 + BIT10; break;
4315         case HDLC_ENCODING_BIPHASE_MARK:  val |= BIT12; break;
4316         case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4317         case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4318         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4319         }
4320
4321         switch (info->params.crc_type & HDLC_CRC_MASK)
4322         {
4323         case HDLC_CRC_16_CCITT: val |= BIT9; break;
4324         case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4325         }
4326
4327         if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4328                 val |= BIT6;
4329
4330         switch (info->params.preamble_length)
4331         {
4332         case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4333         case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4334         case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4335         }
4336
4337         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4338                 val |= BIT0;
4339
4340         wr_reg16(info, TCR, val);
4341
4342         /* TPR (transmit preamble) */
4343
4344         switch (info->params.preamble)
4345         {
4346         case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4347         case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
4348         case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4349         case HDLC_PREAMBLE_PATTERN_10:    val = 0x55; break;
4350         case HDLC_PREAMBLE_PATTERN_01:    val = 0xaa; break;
4351         default:                          val = 0x7e; break;
4352         }
4353         wr_reg8(info, TPR, (unsigned char)val);
4354
4355         /* RCR (rx control)
4356          *
4357          * 15..13  mode
4358          *         000=HDLC/SDLC
4359          *         001=raw bit synchronous
4360          *         010=asynchronous/isochronous
4361          *         011=monosync byte synchronous
4362          *         100=bisync byte synchronous
4363          *         101=xsync byte synchronous
4364          * 12..10  encoding
4365          * 09      CRC enable
4366          * 08      CRC32
4367          * 07..03  reserved, must be 0
4368          * 02      reset
4369          * 01      enable
4370          * 00      auto-DCD enable
4371          */
4372         val = 0;
4373
4374         switch(info->params.mode) {
4375         case MGSL_MODE_XSYNC:
4376                 val |= BIT15 + BIT13;
4377                 break;
4378         case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4379         case MGSL_MODE_BISYNC:   val |= BIT15; break;
4380         case MGSL_MODE_RAW:      val |= BIT13; break;
4381         }
4382
4383         switch(info->params.encoding)
4384         {
4385         case HDLC_ENCODING_NRZB:          val |= BIT10; break;
4386         case HDLC_ENCODING_NRZI_MARK:     val |= BIT11; break;
4387         case HDLC_ENCODING_NRZI:          val |= BIT11 + BIT10; break;
4388         case HDLC_ENCODING_BIPHASE_MARK:  val |= BIT12; break;
4389         case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4390         case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4391         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4392         }
4393
4394         switch (info->params.crc_type & HDLC_CRC_MASK)
4395         {
4396         case HDLC_CRC_16_CCITT: val |= BIT9; break;
4397         case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4398         }
4399
4400         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4401                 val |= BIT0;
4402
4403         wr_reg16(info, RCR, val);
4404
4405         /* CCR (clock control)
4406          *
4407          * 07..05  tx clock source
4408          * 04..02  rx clock source
4409          * 01      auxclk enable
4410          * 00      BRG enable
4411          */
4412         val = 0;
4413
4414         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4415         {
4416                 // when RxC source is DPLL, BRG generates 16X DPLL
4417                 // reference clock, so take TxC from BRG/16 to get
4418                 // transmit clock at actual data rate
4419                 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4420                         val |= BIT6 + BIT5;     /* 011, txclk = BRG/16 */
4421                 else
4422                         val |= BIT6;    /* 010, txclk = BRG */
4423         }
4424         else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4425                 val |= BIT7;    /* 100, txclk = DPLL Input */
4426         else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4427                 val |= BIT5;    /* 001, txclk = RXC Input */
4428
4429         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4430                 val |= BIT3;    /* 010, rxclk = BRG */
4431         else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4432                 val |= BIT4;    /* 100, rxclk = DPLL */
4433         else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4434                 val |= BIT2;    /* 001, rxclk = TXC Input */
4435
4436         if (info->params.clock_speed)
4437                 val |= BIT1 + BIT0;
4438
4439         wr_reg8(info, CCR, (unsigned char)val);
4440
4441         if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4442         {
4443                 // program DPLL mode
4444                 switch(info->params.encoding)
4445                 {
4446                 case HDLC_ENCODING_BIPHASE_MARK:
4447                 case HDLC_ENCODING_BIPHASE_SPACE:
4448                         val = BIT7; break;
4449                 case HDLC_ENCODING_BIPHASE_LEVEL:
4450                 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4451                         val = BIT7 + BIT6; break;
4452                 default: val = BIT6;    // NRZ encodings
4453                 }
4454                 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4455
4456                 // DPLL requires a 16X reference clock from BRG
4457                 set_rate(info, info->params.clock_speed * 16);
4458         }
4459         else
4460                 set_rate(info, info->params.clock_speed);
4461
4462         tx_set_idle(info);
4463
4464         msc_set_vcr(info);
4465
4466         /* SCR (serial control)
4467          *
4468          * 15  1=tx req on FIFO half empty
4469          * 14  1=rx req on FIFO half full
4470          * 13  tx data  IRQ enable
4471          * 12  tx idle  IRQ enable
4472          * 11  underrun IRQ enable
4473          * 10  rx data  IRQ enable
4474          * 09  rx idle  IRQ enable
4475          * 08  overrun  IRQ enable
4476          * 07  DSR      IRQ enable
4477          * 06  CTS      IRQ enable
4478          * 05  DCD      IRQ enable
4479          * 04  RI       IRQ enable
4480          * 03  reserved, must be zero
4481          * 02  1=txd->rxd internal loopback enable
4482          * 01  reserved, must be zero
4483          * 00  1=master IRQ enable
4484          */
4485         wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4486
4487         if (info->params.loopback)
4488                 enable_loopback(info);
4489 }
4490
4491 /*
4492  *  set transmit idle mode
4493  */
4494 static void tx_set_idle(struct slgt_info *info)
4495 {
4496         unsigned char val;
4497         unsigned short tcr;
4498
4499         /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4500          * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4501          */
4502         tcr = rd_reg16(info, TCR);
4503         if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4504                 /* disable preamble, set idle size to 16 bits */
4505                 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4506                 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4507                 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4508         } else if (!(tcr & BIT6)) {
4509                 /* preamble is disabled, set idle size to 8 bits */
4510                 tcr &= ~(BIT5 + BIT4);
4511         }
4512         wr_reg16(info, TCR, tcr);
4513
4514         if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4515                 /* LSB of custom tx idle specified in tx idle register */
4516                 val = (unsigned char)(info->idle_mode & 0xff);
4517         } else {
4518                 /* standard 8 bit idle patterns */
4519                 switch(info->idle_mode)
4520                 {
4521                 case HDLC_TXIDLE_FLAGS:          val = 0x7e; break;
4522                 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4523                 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4524                 case HDLC_TXIDLE_ZEROS:
4525                 case HDLC_TXIDLE_SPACE:          val = 0x00; break;
4526                 default:                         val = 0xff;
4527                 }
4528         }
4529
4530         wr_reg8(info, TIR, val);
4531 }
4532
4533 /*
4534  * get state of V24 status (input) signals
4535  */
4536 static void get_signals(struct slgt_info *info)
4537 {
4538         unsigned short status = rd_reg16(info, SSR);
4539
4540         /* clear all serial signals except DTR and RTS */
4541         info->signals &= SerialSignal_DTR + SerialSignal_RTS;
4542
4543         if (status & BIT3)
4544                 info->signals |= SerialSignal_DSR;
4545         if (status & BIT2)
4546                 info->signals |= SerialSignal_CTS;
4547         if (status & BIT1)
4548                 info->signals |= SerialSignal_DCD;
4549         if (status & BIT0)
4550                 info->signals |= SerialSignal_RI;
4551 }
4552
4553 /*
4554  * set V.24 Control Register based on current configuration
4555  */
4556 static void msc_set_vcr(struct slgt_info *info)
4557 {
4558         unsigned char val = 0;
4559
4560         /* VCR (V.24 control)
4561          *
4562          * 07..04  serial IF select
4563          * 03      DTR
4564          * 02      RTS
4565          * 01      LL
4566          * 00      RL
4567          */
4568
4569         switch(info->if_mode & MGSL_INTERFACE_MASK)
4570         {
4571         case MGSL_INTERFACE_RS232:
4572                 val |= BIT5; /* 0010 */
4573                 break;
4574         case MGSL_INTERFACE_V35:
4575                 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4576                 break;
4577         case MGSL_INTERFACE_RS422:
4578                 val |= BIT6; /* 0100 */
4579                 break;
4580         }
4581
4582         if (info->if_mode & MGSL_INTERFACE_MSB_FIRST)
4583                 val |= BIT4;
4584         if (info->signals & SerialSignal_DTR)
4585                 val |= BIT3;
4586         if (info->signals & SerialSignal_RTS)
4587                 val |= BIT2;
4588         if (info->if_mode & MGSL_INTERFACE_LL)
4589                 val |= BIT1;
4590         if (info->if_mode & MGSL_INTERFACE_RL)
4591                 val |= BIT0;
4592         wr_reg8(info, VCR, val);
4593 }
4594
4595 /*
4596  * set state of V24 control (output) signals
4597  */
4598 static void set_signals(struct slgt_info *info)
4599 {
4600         unsigned char val = rd_reg8(info, VCR);
4601         if (info->signals & SerialSignal_DTR)
4602                 val |= BIT3;
4603         else
4604                 val &= ~BIT3;
4605         if (info->signals & SerialSignal_RTS)
4606                 val |= BIT2;
4607         else
4608                 val &= ~BIT2;
4609         wr_reg8(info, VCR, val);
4610 }
4611
4612 /*
4613  * free range of receive DMA buffers (i to last)
4614  */
4615 static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4616 {
4617         int done = 0;
4618
4619         while(!done) {
4620                 /* reset current buffer for reuse */
4621                 info->rbufs[i].status = 0;
4622                 set_desc_count(info->rbufs[i], info->rbuf_fill_level);
4623                 if (i == last)
4624                         done = 1;
4625                 if (++i == info->rbuf_count)
4626                         i = 0;
4627         }
4628         info->rbuf_current = i;
4629 }
4630
4631 /*
4632  * mark all receive DMA buffers as free
4633  */
4634 static void reset_rbufs(struct slgt_info *info)
4635 {
4636         free_rbufs(info, 0, info->rbuf_count - 1);
4637         info->rbuf_fill_index = 0;
4638         info->rbuf_fill_count = 0;
4639 }
4640
4641 /*
4642  * pass receive HDLC frame to upper layer
4643  *
4644  * return true if frame available, otherwise false
4645  */
4646 static bool rx_get_frame(struct slgt_info *info)
4647 {
4648         unsigned int start, end;
4649         unsigned short status;
4650         unsigned int framesize = 0;
4651         unsigned long flags;
4652         struct tty_struct *tty = info->port.tty;
4653         unsigned char addr_field = 0xff;
4654         unsigned int crc_size = 0;
4655
4656         switch (info->params.crc_type & HDLC_CRC_MASK) {
4657         case HDLC_CRC_16_CCITT: crc_size = 2; break;
4658         case HDLC_CRC_32_CCITT: crc_size = 4; break;
4659         }
4660
4661 check_again:
4662
4663         framesize = 0;
4664         addr_field = 0xff;
4665         start = end = info->rbuf_current;
4666
4667         for (;;) {
4668                 if (!desc_complete(info->rbufs[end]))
4669                         goto cleanup;
4670
4671                 if (framesize == 0 && info->params.addr_filter != 0xff)
4672                         addr_field = info->rbufs[end].buf[0];
4673
4674                 framesize += desc_count(info->rbufs[end]);
4675
4676                 if (desc_eof(info->rbufs[end]))
4677                         break;
4678
4679                 if (++end == info->rbuf_count)
4680                         end = 0;
4681
4682                 if (end == info->rbuf_current) {
4683                         if (info->rx_enabled){
4684                                 spin_lock_irqsave(&info->lock,flags);
4685                                 rx_start(info);
4686                                 spin_unlock_irqrestore(&info->lock,flags);
4687                         }
4688                         goto cleanup;
4689                 }
4690         }
4691
4692         /* status
4693          *
4694          * 15      buffer complete
4695          * 14..06  reserved
4696          * 05..04  residue
4697          * 02      eof (end of frame)
4698          * 01      CRC error
4699          * 00      abort
4700          */
4701         status = desc_status(info->rbufs[end]);
4702
4703         /* ignore CRC bit if not using CRC (bit is undefined) */
4704         if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4705                 status &= ~BIT1;
4706
4707         if (framesize == 0 ||
4708                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4709                 free_rbufs(info, start, end);
4710                 goto check_again;
4711         }
4712
4713         if (framesize < (2 + crc_size) || status & BIT0) {
4714                 info->icount.rxshort++;
4715                 framesize = 0;
4716         } else if (status & BIT1) {
4717                 info->icount.rxcrc++;
4718                 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4719                         framesize = 0;
4720         }
4721
4722 #if SYNCLINK_GENERIC_HDLC
4723         if (framesize == 0) {
4724                 info->netdev->stats.rx_errors++;
4725                 info->netdev->stats.rx_frame_errors++;
4726         }
4727 #endif
4728
4729         DBGBH(("%s rx frame status=%04X size=%d\n",
4730                 info->device_name, status, framesize));
4731         DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx");
4732
4733         if (framesize) {
4734                 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4735                         framesize -= crc_size;
4736                         crc_size = 0;
4737                 }
4738
4739                 if (framesize > info->max_frame_size + crc_size)
4740                         info->icount.rxlong++;
4741                 else {
4742                         /* copy dma buffer(s) to contiguous temp buffer */
4743                         int copy_count = framesize;
4744                         int i = start;
4745                         unsigned char *p = info->tmp_rbuf;
4746                         info->tmp_rbuf_count = framesize;
4747
4748                         info->icount.rxok++;
4749
4750                         while(copy_count) {
4751                                 int partial_count = min_t(int, copy_count, info->rbuf_fill_level);
4752                                 memcpy(p, info->rbufs[i].buf, partial_count);
4753                                 p += partial_count;
4754                                 copy_count -= partial_count;
4755                                 if (++i == info->rbuf_count)
4756                                         i = 0;
4757                         }
4758
4759                         if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4760                                 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4761                                 framesize++;
4762                         }
4763
4764 #if SYNCLINK_GENERIC_HDLC
4765                         if (info->netcount)
4766                                 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4767                         else
4768 #endif
4769                                 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
4770                 }
4771         }
4772         free_rbufs(info, start, end);
4773         return true;
4774
4775 cleanup:
4776         return false;
4777 }
4778
4779 /*
4780  * pass receive buffer (RAW synchronous mode) to tty layer
4781  * return true if buffer available, otherwise false
4782  */
4783 static bool rx_get_buf(struct slgt_info *info)
4784 {
4785         unsigned int i = info->rbuf_current;
4786         unsigned int count;
4787
4788         if (!desc_complete(info->rbufs[i]))
4789                 return false;
4790         count = desc_count(info->rbufs[i]);
4791         switch(info->params.mode) {
4792         case MGSL_MODE_MONOSYNC:
4793         case MGSL_MODE_BISYNC:
4794         case MGSL_MODE_XSYNC:
4795                 /* ignore residue in byte synchronous modes */
4796                 if (desc_residue(info->rbufs[i]))
4797                         count--;
4798                 break;
4799         }
4800         DBGDATA(info, info->rbufs[i].buf, count, "rx");
4801         DBGINFO(("rx_get_buf size=%d\n", count));
4802         if (count)
4803                 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf,
4804                                   info->flag_buf, count);
4805         free_rbufs(info, i, i);
4806         return true;
4807 }
4808
4809 static void reset_tbufs(struct slgt_info *info)
4810 {
4811         unsigned int i;
4812         info->tbuf_current = 0;
4813         for (i=0 ; i < info->tbuf_count ; i++) {
4814                 info->tbufs[i].status = 0;
4815                 info->tbufs[i].count  = 0;
4816         }
4817 }
4818
4819 /*
4820  * return number of free transmit DMA buffers
4821  */
4822 static unsigned int free_tbuf_count(struct slgt_info *info)
4823 {
4824         unsigned int count = 0;
4825         unsigned int i = info->tbuf_current;
4826
4827         do
4828         {
4829                 if (desc_count(info->tbufs[i]))
4830                         break; /* buffer in use */
4831                 ++count;
4832                 if (++i == info->tbuf_count)
4833                         i=0;
4834         } while (i != info->tbuf_current);
4835
4836         /* if tx DMA active, last zero count buffer is in use */
4837         if (count && (rd_reg32(info, TDCSR) & BIT0))
4838                 --count;
4839
4840         return count;
4841 }
4842
4843 /*
4844  * return number of bytes in unsent transmit DMA buffers
4845  * and the serial controller tx FIFO
4846  */
4847 static unsigned int tbuf_bytes(struct slgt_info *info)
4848 {
4849         unsigned int total_count = 0;
4850         unsigned int i = info->tbuf_current;
4851         unsigned int reg_value;
4852         unsigned int count;
4853         unsigned int active_buf_count = 0;
4854
4855         /*
4856          * Add descriptor counts for all tx DMA buffers.
4857          * If count is zero (cleared by DMA controller after read),
4858          * the buffer is complete or is actively being read from.
4859          *
4860          * Record buf_count of last buffer with zero count starting
4861          * from current ring position. buf_count is mirror
4862          * copy of count and is not cleared by serial controller.
4863          * If DMA controller is active, that buffer is actively
4864          * being read so add to total.
4865          */
4866         do {
4867                 count = desc_count(info->tbufs[i]);
4868                 if (count)
4869                         total_count += count;
4870                 else if (!total_count)
4871                         active_buf_count = info->tbufs[i].buf_count;
4872                 if (++i == info->tbuf_count)
4873                         i = 0;
4874         } while (i != info->tbuf_current);
4875
4876         /* read tx DMA status register */
4877         reg_value = rd_reg32(info, TDCSR);
4878
4879         /* if tx DMA active, last zero count buffer is in use */
4880         if (reg_value & BIT0)
4881                 total_count += active_buf_count;
4882
4883         /* add tx FIFO count = reg_value[15..8] */
4884         total_count += (reg_value >> 8) & 0xff;
4885
4886         /* if transmitter active add one byte for shift register */
4887         if (info->tx_active)
4888                 total_count++;
4889
4890         return total_count;
4891 }
4892
4893 /*
4894  * load data into transmit DMA buffer ring and start transmitter if needed
4895  * return true if data accepted, otherwise false (buffers full)
4896  */
4897 static bool tx_load(struct slgt_info *info, const char *buf, unsigned int size)
4898 {
4899         unsigned short count;
4900         unsigned int i;
4901         struct slgt_desc *d;
4902
4903         /* check required buffer space */
4904         if (DIV_ROUND_UP(size, DMABUFSIZE) > free_tbuf_count(info))
4905                 return false;
4906
4907         DBGDATA(info, buf, size, "tx");
4908
4909         /*
4910          * copy data to one or more DMA buffers in circular ring
4911          * tbuf_start   = first buffer for this data
4912          * tbuf_current = next free buffer
4913          *
4914          * Copy all data before making data visible to DMA controller by
4915          * setting descriptor count of the first buffer.
4916          * This prevents an active DMA controller from reading the first DMA
4917          * buffers of a frame and stopping before the final buffers are filled.
4918          */
4919
4920         info->tbuf_start = i = info->tbuf_current;
4921
4922         while (size) {
4923                 d = &info->tbufs[i];
4924
4925                 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4926                 memcpy(d->buf, buf, count);
4927
4928                 size -= count;
4929                 buf  += count;
4930
4931                 /*
4932                  * set EOF bit for last buffer of HDLC frame or
4933                  * for every buffer in raw mode
4934                  */
4935                 if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
4936                     info->params.mode == MGSL_MODE_RAW)
4937                         set_desc_eof(*d, 1);
4938                 else
4939                         set_desc_eof(*d, 0);
4940
4941                 /* set descriptor count for all but first buffer */
4942                 if (i != info->tbuf_start)
4943                         set_desc_count(*d, count);
4944                 d->buf_count = count;
4945
4946                 if (++i == info->tbuf_count)
4947                         i = 0;
4948         }
4949
4950         info->tbuf_current = i;
4951
4952         /* set first buffer count to make new data visible to DMA controller */
4953         d = &info->tbufs[info->tbuf_start];
4954         set_desc_count(*d, d->buf_count);
4955
4956         /* start transmitter if needed and update transmit timeout */
4957         if (!info->tx_active)
4958                 tx_start(info);
4959         update_tx_timer(info);
4960
4961         return true;
4962 }
4963
4964 static int register_test(struct slgt_info *info)
4965 {
4966         static unsigned short patterns[] =
4967                 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4968         static unsigned int count = ARRAY_SIZE(patterns);
4969         unsigned int i;
4970         int rc = 0;
4971
4972         for (i=0 ; i < count ; i++) {
4973                 wr_reg16(info, TIR, patterns[i]);
4974                 wr_reg16(info, BDR, patterns[(i+1)%count]);
4975                 if ((rd_reg16(info, TIR) != patterns[i]) ||
4976                     (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4977                         rc = -ENODEV;
4978                         break;
4979                 }
4980         }
4981         info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4982         info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4983         return rc;
4984 }
4985
4986 static int irq_test(struct slgt_info *info)
4987 {
4988         unsigned long timeout;
4989         unsigned long flags;
4990         struct tty_struct *oldtty = info->port.tty;
4991         u32 speed = info->params.data_rate;
4992
4993         info->params.data_rate = 921600;
4994         info->port.tty = NULL;
4995
4996         spin_lock_irqsave(&info->lock, flags);
4997         async_mode(info);
4998         slgt_irq_on(info, IRQ_TXIDLE);
4999
5000         /* enable transmitter */
5001         wr_reg16(info, TCR,
5002                 (unsigned short)(rd_reg16(info, TCR) | BIT1));
5003
5004         /* write one byte and wait for tx idle */
5005         wr_reg16(info, TDR, 0);
5006
5007         /* assume failure */
5008         info->init_error = DiagStatus_IrqFailure;
5009         info->irq_occurred = false;
5010
5011         spin_unlock_irqrestore(&info->lock, flags);
5012
5013         timeout=100;
5014         while(timeout-- && !info->irq_occurred)
5015                 msleep_interruptible(10);
5016
5017         spin_lock_irqsave(&info->lock,flags);
5018         reset_port(info);
5019         spin_unlock_irqrestore(&info->lock,flags);
5020
5021         info->params.data_rate = speed;
5022         info->port.tty = oldtty;
5023
5024         info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
5025         return info->irq_occurred ? 0 : -ENODEV;
5026 }
5027
5028 static int loopback_test_rx(struct slgt_info *info)
5029 {
5030         unsigned char *src, *dest;
5031         int count;
5032
5033         if (desc_complete(info->rbufs[0])) {
5034                 count = desc_count(info->rbufs[0]);
5035                 src   = info->rbufs[0].buf;
5036                 dest  = info->tmp_rbuf;
5037
5038                 for( ; count ; count-=2, src+=2) {
5039                         /* src=data byte (src+1)=status byte */
5040                         if (!(*(src+1) & (BIT9 + BIT8))) {
5041                                 *dest = *src;
5042                                 dest++;
5043                                 info->tmp_rbuf_count++;
5044                         }
5045                 }
5046                 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
5047                 return 1;
5048         }
5049         return 0;
5050 }
5051
5052 static int loopback_test(struct slgt_info *info)
5053 {
5054 #define TESTFRAMESIZE 20
5055
5056         unsigned long timeout;
5057         u16 count = TESTFRAMESIZE;
5058         unsigned char buf[TESTFRAMESIZE];
5059         int rc = -ENODEV;
5060         unsigned long flags;
5061
5062         struct tty_struct *oldtty = info->port.tty;
5063         MGSL_PARAMS params;
5064
5065         memcpy(&params, &info->params, sizeof(params));
5066
5067         info->params.mode = MGSL_MODE_ASYNC;
5068         info->params.data_rate = 921600;
5069         info->params.loopback = 1;
5070         info->port.tty = NULL;
5071
5072         /* build and send transmit frame */
5073         for (count = 0; count < TESTFRAMESIZE; ++count)
5074                 buf[count] = (unsigned char)count;
5075
5076         info->tmp_rbuf_count = 0;
5077         memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
5078
5079         /* program hardware for HDLC and enabled receiver */
5080         spin_lock_irqsave(&info->lock,flags);
5081         async_mode(info);
5082         rx_start(info);
5083         tx_load(info, buf, count);
5084         spin_unlock_irqrestore(&info->lock, flags);
5085
5086         /* wait for receive complete */
5087         for (timeout = 100; timeout; --timeout) {
5088                 msleep_interruptible(10);
5089                 if (loopback_test_rx(info)) {
5090                         rc = 0;
5091                         break;
5092                 }
5093         }
5094
5095         /* verify received frame length and contents */
5096         if (!rc && (info->tmp_rbuf_count != count ||
5097                   memcmp(buf, info->tmp_rbuf, count))) {
5098                 rc = -ENODEV;
5099         }
5100
5101         spin_lock_irqsave(&info->lock,flags);
5102         reset_adapter(info);
5103         spin_unlock_irqrestore(&info->lock,flags);
5104
5105         memcpy(&info->params, &params, sizeof(info->params));
5106         info->port.tty = oldtty;
5107
5108         info->init_error = rc ? DiagStatus_DmaFailure : 0;
5109         return rc;
5110 }
5111
5112 static int adapter_test(struct slgt_info *info)
5113 {
5114         DBGINFO(("testing %s\n", info->device_name));
5115         if (register_test(info) < 0) {
5116                 printk("register test failure %s addr=%08X\n",
5117                         info->device_name, info->phys_reg_addr);
5118         } else if (irq_test(info) < 0) {
5119                 printk("IRQ test failure %s IRQ=%d\n",
5120                         info->device_name, info->irq_level);
5121         } else if (loopback_test(info) < 0) {
5122                 printk("loopback test failure %s\n", info->device_name);
5123         }
5124         return info->init_error;
5125 }
5126
5127 /*
5128  * transmit timeout handler
5129  */
5130 static void tx_timeout(unsigned long context)
5131 {
5132         struct slgt_info *info = (struct slgt_info*)context;
5133         unsigned long flags;
5134
5135         DBGINFO(("%s tx_timeout\n", info->device_name));
5136         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5137                 info->icount.txtimeout++;
5138         }
5139         spin_lock_irqsave(&info->lock,flags);
5140         tx_stop(info);
5141         spin_unlock_irqrestore(&info->lock,flags);
5142
5143 #if SYNCLINK_GENERIC_HDLC
5144         if (info->netcount)
5145                 hdlcdev_tx_done(info);
5146         else
5147 #endif
5148                 bh_transmit(info);
5149 }
5150
5151 /*
5152  * receive buffer polling timer
5153  */
5154 static void rx_timeout(unsigned long context)
5155 {
5156         struct slgt_info *info = (struct slgt_info*)context;
5157         unsigned long flags;
5158
5159         DBGINFO(("%s rx_timeout\n", info->device_name));
5160         spin_lock_irqsave(&info->lock, flags);
5161         info->pending_bh |= BH_RECEIVE;
5162         spin_unlock_irqrestore(&info->lock, flags);
5163         bh_handler(&info->task);
5164 }
5165