931cbdf6d79165648e0a383235af4221c71581c6
[linux-3.10.git] / drivers / net / wan / pc300_tty.c
1 /*
2  * pc300_tty.c  Cyclades-PC300(tm) TTY Driver.
3  *
4  * Author:      Regina Kodato <reginak@cyclades.com>
5  *
6  * Copyright:   (c) 1999-2002 Cyclades Corp.
7  *
8  *      This program is free software; you can redistribute it and/or
9  *  modify it under the terms of the GNU General Public License
10  *  as published by the Free Software Foundation; either version
11  *  2 of the License, or (at your option) any later version.
12  *   
13  *  $Log: pc300_tty.c,v $
14  *  Revision 3.7  2002/03/07 14:17:09  henrique
15  *  License data fixed
16  *
17  *  Revision 3.6  2001/12/10 12:29:42  regina
18  *  Fix the MLPPP bug
19  *
20  *  Revision 3.5  2001/10/31 11:20:05  regina
21  *  automatic pppd starts
22  *
23  *  Revision 3.4  2001/08/06 12:01:51  regina
24  *  problem in DSR_DE bit
25  *
26  *  Revision 3.3  2001/07/26 22:58:41  regina
27  *  update EDA value
28  *
29  *  Revision 3.2  2001/07/12 13:11:20  regina
30  *  bug fix - DCD-OFF in pc300 tty driver
31  *
32  *      DMA transmission bug fix
33  *  
34  *  Revision 3.1  2001/06/22 13:13:02  regina
35  *  MLPPP implementation
36  *
37  */
38
39 #include <linux/module.h>
40 #include <linux/kernel.h>
41 #include <linux/pci.h>
42 #include <linux/errno.h>
43 #include <linux/string.h>
44 #include <linux/init.h>
45 #include <linux/netdevice.h>
46 #include <linux/spinlock.h>
47 #include <linux/slab.h>
48 #include <linux/if.h>
49 #include <linux/skbuff.h>
50 /* TTY includes */
51 #include <linux/tty.h>
52 #include <linux/tty_flip.h>
53 #include <linux/serial.h>
54
55 #include <asm/io.h>
56 #include <asm/uaccess.h>
57
58 #include "pc300.h"
59
60 /* defines and macros */
61 /* TTY Global definitions */
62 #define CPC_TTY_NPORTS  8       /* maximum number of the sync tty connections */
63 #define CPC_TTY_MAJOR   CYCLADES_MAJOR  
64 #define CPC_TTY_MINOR_START     240     /* minor of the first PC300 interface */
65
66 #define CPC_TTY_MAX_MTU 2000    
67
68 /* tty interface state */
69 #define CPC_TTY_ST_IDLE 0
70 #define CPC_TTY_ST_INIT 1       /* configured with MLPPP and up */
71 #define CPC_TTY_ST_OPEN 2       /* opened by application */
72
73 #define CPC_TTY_LOCK(card,flags)\
74         do {\
75                 spin_lock_irqsave(&card->card_lock, flags);     \
76         } while (0)
77
78 #define CPC_TTY_UNLOCK(card,flags)      \
79         do {\
80                 spin_unlock_irqrestore(&card->card_lock, flags);        \
81         } while (0)
82
83 //#define       CPC_TTY_DBG(format,a...)        printk(format,##a)
84 #define CPC_TTY_DBG(format,a...)
85
86 /* data structures */
87 typedef struct _st_cpc_rx_buf {
88         struct _st_cpc_rx_buf   *next;
89         int             size;
90         unsigned char   data[1];
91 } st_cpc_rx_buf;
92
93 struct st_cpc_rx_list {
94         st_cpc_rx_buf   *first;
95         st_cpc_rx_buf   *last;
96 };
97
98 typedef struct _st_cpc_tty_area {
99         int             state;          /* state of the TTY interface */
100         int             num_open;       
101         unsigned int    tty_minor;      /* minor this interface */
102         volatile struct st_cpc_rx_list buf_rx;  /* ptr. to reception buffer */
103         unsigned char*  buf_tx;         /* ptr. to transmission buffer */
104         pc300dev_t*     pc300dev;       /* ptr. to info struct in PC300 driver */
105         unsigned char   name[20];       /* interf. name + "-tty" */
106         struct tty_struct *tty;         
107         struct work_struct tty_tx_work; /* tx work - tx interrupt */
108         struct work_struct tty_rx_work; /* rx work - rx interrupt */
109         } st_cpc_tty_area;
110
111 /* TTY data structures */
112 static struct tty_driver serial_drv;
113
114 /* local variables */
115 static st_cpc_tty_area  cpc_tty_area[CPC_TTY_NPORTS];
116
117 static int cpc_tty_cnt = 0;     /* number of intrfaces configured with MLPPP */
118 static int cpc_tty_unreg_flag = 0;
119
120 /* TTY functions prototype */
121 static int cpc_tty_open(struct tty_struct *tty, struct file *flip);
122 static void cpc_tty_close(struct tty_struct *tty, struct file *flip);
123 static int cpc_tty_write(struct tty_struct *tty, const unsigned char *buf, int count);
124 static int cpc_tty_write_room(struct tty_struct *tty);
125 static int cpc_tty_chars_in_buffer(struct tty_struct *tty);
126 static void cpc_tty_flush_buffer(struct tty_struct *tty);
127 static void cpc_tty_hangup(struct tty_struct *tty);
128 static void cpc_tty_rx_work(void *data);
129 static void cpc_tty_tx_work(void *data);
130 static int cpc_tty_send_to_card(pc300dev_t *dev,void *buf, int len);
131 static void cpc_tty_trace(pc300dev_t *dev, char* buf, int len, char rxtx);
132 static void cpc_tty_signal_off(pc300dev_t *pc300dev, unsigned char);
133 static void cpc_tty_signal_on(pc300dev_t *pc300dev, unsigned char);
134
135 static int pc300_tiocmset(struct tty_struct *, struct file *,
136                           unsigned int, unsigned int);
137 static int pc300_tiocmget(struct tty_struct *, struct file *);
138
139 /* functions called by PC300 driver */
140 void cpc_tty_init(pc300dev_t *dev);
141 void cpc_tty_unregister_service(pc300dev_t *pc300dev);
142 void cpc_tty_receive(pc300dev_t *pc300dev);
143 void cpc_tty_trigger_poll(pc300dev_t *pc300dev);
144 void cpc_tty_reset_var(void);
145
146 /*
147  * PC300 TTY clear "signal"
148  */
149 static void cpc_tty_signal_off(pc300dev_t *pc300dev, unsigned char signal)
150 {
151         pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan; 
152         pc300_t *card = (pc300_t *) pc300chan->card; 
153         int ch = pc300chan->channel; 
154         unsigned long flags; 
155
156         CPC_TTY_DBG("%s-tty: Clear signal %x\n",
157                 pc300dev->dev->name, signal);
158         CPC_TTY_LOCK(card, flags); 
159         cpc_writeb(card->hw.scabase + M_REG(CTL,ch), 
160                 cpc_readb(card->hw.scabase+M_REG(CTL,ch))& signal);
161         CPC_TTY_UNLOCK(card,flags); 
162 }
163
164 /*
165  * PC300 TTY set "signal" to ON
166  */
167 static void cpc_tty_signal_on(pc300dev_t *pc300dev, unsigned char signal)
168 {
169         pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan; 
170         pc300_t *card = (pc300_t *) pc300chan->card; 
171         int ch = pc300chan->channel; 
172         unsigned long flags; 
173
174         CPC_TTY_DBG("%s-tty: Set signal %x\n",
175                 pc300dev->dev->name, signal);
176         CPC_TTY_LOCK(card, flags); 
177         cpc_writeb(card->hw.scabase + M_REG(CTL,ch), 
178                 cpc_readb(card->hw.scabase+M_REG(CTL,ch))& ~signal);
179         CPC_TTY_UNLOCK(card,flags); 
180 }
181
182 /*
183  * PC300 TTY initialization routine
184  *
185  * This routine is called by the PC300 driver during board configuration 
186  * (ioctl=SIOCSP300CONF). At this point the adapter is completely
187  * initialized.
188  * o verify kernel version (only 2.4.x)
189  * o register TTY driver
190  * o init cpc_tty_area struct
191  */
192 void cpc_tty_init(pc300dev_t *pc300dev)
193 {
194         unsigned long port;
195         int aux;
196         st_cpc_tty_area * cpc_tty;
197
198         /* hdlcX - X=interface number */
199         port = pc300dev->dev->name[4] - '0';
200         if (port >= CPC_TTY_NPORTS) {
201                 printk("%s-tty: invalid interface selected (0-%i): %li",
202                         pc300dev->dev->name,
203                         CPC_TTY_NPORTS-1,port);
204                 return;
205         }
206
207         if (cpc_tty_cnt == 0) { /* first TTY connection -> register driver */
208                 CPC_TTY_DBG("%s-tty: driver init, major:%i, minor range:%i=%i\n",
209                         pc300dev->dev->name,
210                         CPC_TTY_MAJOR, CPC_TTY_MINOR_START,
211                         CPC_TTY_MINOR_START+CPC_TTY_NPORTS);
212                 /* initialize tty driver struct */
213                 memset(&serial_drv,0,sizeof(struct tty_driver));
214                 serial_drv.magic = TTY_DRIVER_MAGIC;
215                 serial_drv.owner = THIS_MODULE;
216                 serial_drv.driver_name = "pc300_tty";
217                 serial_drv.name = "ttyCP";
218                 serial_drv.major = CPC_TTY_MAJOR;
219                 serial_drv.minor_start = CPC_TTY_MINOR_START;
220                 serial_drv.num = CPC_TTY_NPORTS;
221                 serial_drv.type = TTY_DRIVER_TYPE_SERIAL;
222                 serial_drv.subtype = SERIAL_TYPE_NORMAL;
223
224                 serial_drv.init_termios = tty_std_termios;
225                 serial_drv.init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
226                 serial_drv.flags = TTY_DRIVER_REAL_RAW;
227
228                 /* interface routines from the upper tty layer to the tty driver */
229                 serial_drv.open = cpc_tty_open;
230                 serial_drv.close = cpc_tty_close;
231                 serial_drv.write = cpc_tty_write; 
232                 serial_drv.write_room = cpc_tty_write_room; 
233                 serial_drv.chars_in_buffer = cpc_tty_chars_in_buffer; 
234                 serial_drv.tiocmset = pc300_tiocmset;
235                 serial_drv.tiocmget = pc300_tiocmget;
236                 serial_drv.flush_buffer = cpc_tty_flush_buffer; 
237                 serial_drv.hangup = cpc_tty_hangup;
238
239                 /* register the TTY driver */
240                 if (tty_register_driver(&serial_drv)) { 
241                         printk("%s-tty: Failed to register serial driver! ",
242                                 pc300dev->dev->name);
243                         return;
244                 } 
245
246                 memset((void *)cpc_tty_area, 0,
247                                                                 sizeof(st_cpc_tty_area) * CPC_TTY_NPORTS);
248         }
249
250         cpc_tty = &cpc_tty_area[port];
251         
252         if (cpc_tty->state != CPC_TTY_ST_IDLE) {
253                 CPC_TTY_DBG("%s-tty: TTY port %i, already in use.\n",
254                                 pc300dev->dev->name, port);
255                 return;
256         }
257
258         cpc_tty_cnt++;
259         cpc_tty->state = CPC_TTY_ST_INIT; 
260         cpc_tty->num_open= 0;
261         cpc_tty->tty_minor = port + CPC_TTY_MINOR_START;
262         cpc_tty->pc300dev = pc300dev; 
263
264         INIT_WORK(&cpc_tty->tty_tx_work, cpc_tty_tx_work, (void *)cpc_tty);
265         INIT_WORK(&cpc_tty->tty_rx_work, cpc_tty_rx_work, (void *)port);
266         
267         cpc_tty->buf_rx.first = cpc_tty->buf_rx.last = NULL;
268
269         pc300dev->cpc_tty = (void *)cpc_tty; 
270         
271         aux = strlen(pc300dev->dev->name);
272         memcpy(cpc_tty->name, pc300dev->dev->name, aux);
273         memcpy(&cpc_tty->name[aux], "-tty", 5);
274         
275         cpc_open(pc300dev->dev);
276         cpc_tty_signal_off(pc300dev, CTL_DTR);
277
278         CPC_TTY_DBG("%s: Initializing TTY Sync Driver, tty major#%d minor#%i\n",
279                         cpc_tty->name,CPC_TTY_MAJOR,cpc_tty->tty_minor); 
280         return; 
281
282
283 /*
284  * PC300 TTY OPEN routine
285  *
286  * This routine is called by the tty driver to open the interface 
287  * o verify minor
288  * o allocate buffer to Rx and Tx
289  */
290 static int cpc_tty_open(struct tty_struct *tty, struct file *flip)
291 {
292         int port ;
293         st_cpc_tty_area *cpc_tty;
294
295         if (!tty) { 
296                 return -ENODEV;
297         } 
298
299         port = tty->index;
300
301         if ((port < 0) || (port >= CPC_TTY_NPORTS)){ 
302                 CPC_TTY_DBG("pc300_tty: open invalid port %d\n", port);
303                 return -ENODEV;
304         } 
305
306         cpc_tty = &cpc_tty_area[port];
307         
308         if (cpc_tty->state == CPC_TTY_ST_IDLE){
309                 CPC_TTY_DBG("%s: open - invalid interface, port=%d\n",
310                                         cpc_tty->name, tty->index);
311                 return -ENODEV;
312         }
313
314         if (cpc_tty->num_open == 0) { /* first open of this tty */
315                 if (!cpc_tty_area[port].buf_tx){
316                         cpc_tty_area[port].buf_tx = kmalloc(CPC_TTY_MAX_MTU,GFP_KERNEL);
317                         if (cpc_tty_area[port].buf_tx == 0){
318                                 CPC_TTY_DBG("%s: error in memory allocation\n",cpc_tty->name);
319                                 return -ENOMEM;
320                         }
321                 } 
322
323                 if (cpc_tty_area[port].buf_rx.first) {
324                         unsigned char * aux;
325                         while (cpc_tty_area[port].buf_rx.first) {
326                                 aux = (unsigned char *)cpc_tty_area[port].buf_rx.first;
327                                 cpc_tty_area[port].buf_rx.first = cpc_tty_area[port].buf_rx.first->next;
328                                 kfree(aux);
329                         }
330                         cpc_tty_area[port].buf_rx.first = NULL;
331                         cpc_tty_area[port].buf_rx.last = NULL;
332                 }
333
334                 cpc_tty_area[port].state = CPC_TTY_ST_OPEN;
335                 cpc_tty_area[port].tty = tty;
336                 tty->driver_data = &cpc_tty_area[port];
337
338                 cpc_tty_signal_on(cpc_tty->pc300dev, CTL_DTR);
339         } 
340
341         cpc_tty->num_open++;
342
343         CPC_TTY_DBG("%s: opening TTY driver\n", cpc_tty->name);
344         
345         /* avisar driver PC300 */ 
346         return 0; 
347 }
348
349 /*
350  * PC300 TTY CLOSE routine
351  *
352  * This routine is called by the tty driver to close the interface 
353  * o call close channel in PC300 driver (cpc_closech)
354  * o free Rx and Tx buffers
355  */
356
357 static void cpc_tty_close(struct tty_struct *tty, struct file *flip)
358 {
359         st_cpc_tty_area    *cpc_tty;
360         unsigned long flags;
361         int res;
362
363         if (!tty || !tty->driver_data ) {
364                 CPC_TTY_DBG("hdlx-tty: no TTY in close \n");
365                 return;
366         }
367
368         cpc_tty = (st_cpc_tty_area *) tty->driver_data;
369
370         if ((cpc_tty->tty != tty)|| (cpc_tty->state != CPC_TTY_ST_OPEN)) {
371                 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
372                 return;
373         }
374         
375         if (!cpc_tty->num_open) {
376                 CPC_TTY_DBG("%s: TTY is closed\n",cpc_tty->name);
377                 return;
378         }
379
380         if (--cpc_tty->num_open > 0) {
381                 CPC_TTY_DBG("%s: TTY closed\n",cpc_tty->name);
382                 return;
383         }
384
385         cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
386
387         CPC_TTY_LOCK(cpc_tty->pc300dev->chan->card, flags);  /* lock irq */ 
388         cpc_tty->tty = NULL;
389         cpc_tty->state = CPC_TTY_ST_INIT;
390         CPC_TTY_UNLOCK(cpc_tty->pc300dev->chan->card, flags); /* unlock irq */ 
391         
392         if (cpc_tty->buf_rx.first) {
393                 unsigned char * aux;
394                 while (cpc_tty->buf_rx.first) {
395                         aux = (unsigned char *)cpc_tty->buf_rx.first;
396                         cpc_tty->buf_rx.first = cpc_tty->buf_rx.first->next;
397                         kfree(aux);
398                 }
399                 cpc_tty->buf_rx.first = NULL;
400                 cpc_tty->buf_rx.last = NULL;
401         }
402         
403         kfree(cpc_tty->buf_tx);
404         cpc_tty->buf_tx = NULL;
405
406         CPC_TTY_DBG("%s: TTY closed\n",cpc_tty->name);
407         
408         if (!serial_drv.refcount && cpc_tty_unreg_flag) {
409                 cpc_tty_unreg_flag = 0;
410                 CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
411                 if ((res=tty_unregister_driver(&serial_drv))) { 
412                         CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
413                                                         cpc_tty->name,res);
414                 }
415         }
416         return; 
417
418
419 /*
420  * PC300 TTY WRITE routine
421  *
422  * This routine is called by the tty driver to write a series of characters
423  * to the tty device. The characters may come from user or kernel space.
424  * o verify the DCD signal
425  * o send characters to board and start the transmission
426  */
427 static int cpc_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
428 {
429         st_cpc_tty_area    *cpc_tty; 
430         pc300ch_t *pc300chan; 
431         pc300_t *card; 
432         int ch; 
433         unsigned long flags; 
434         struct net_device_stats *stats; 
435
436         if (!tty || !tty->driver_data ) { 
437                 CPC_TTY_DBG("hdlcX-tty: no TTY in write\n");
438                 return -ENODEV;
439         } 
440
441         cpc_tty = (st_cpc_tty_area *) tty->driver_data; 
442
443         if ((cpc_tty->tty != tty) ||  (cpc_tty->state != CPC_TTY_ST_OPEN)) { 
444                 CPC_TTY_DBG("%s: TTY is not opened\n", cpc_tty->name);
445                 return -ENODEV; 
446         }
447
448         if (count > CPC_TTY_MAX_MTU) { 
449                 CPC_TTY_DBG("%s: count is invalid\n",cpc_tty->name);
450                 return -EINVAL;        /* frame too big */ 
451         }
452
453         CPC_TTY_DBG("%s: cpc_tty_write data len=%i\n",cpc_tty->name,count);
454         
455         pc300chan = (pc300ch_t *)((pc300dev_t*)cpc_tty->pc300dev)->chan; 
456         stats = hdlc_stats(((pc300dev_t*)cpc_tty->pc300dev)->dev);
457         card = (pc300_t *) pc300chan->card;
458         ch = pc300chan->channel; 
459
460         /* verify DCD signal*/ 
461         if (cpc_readb(card->hw.scabase + M_REG(ST3,ch)) & ST3_DCD) { 
462                 /* DCD is OFF */ 
463                 CPC_TTY_DBG("%s : DCD is OFF\n", cpc_tty->name);
464                 stats->tx_errors++;
465                 stats->tx_carrier_errors++;
466                 CPC_TTY_LOCK(card, flags); 
467                 cpc_writeb(card->hw.scabase + M_REG(CMD, ch), CMD_TX_BUF_CLR); 
468                 
469                 if (card->hw.type == PC300_TE) { 
470                         cpc_writeb(card->hw.falcbase + card->hw.cpld_reg2, 
471                                 cpc_readb(card->hw.falcbase + card->hw.cpld_reg2) & 
472                                 ~(CPLD_REG2_FALC_LED1 << (2 *ch))); 
473                 }
474
475                 CPC_TTY_UNLOCK(card, flags); 
476
477                 return -EINVAL; 
478         }
479
480         if (cpc_tty_send_to_card(cpc_tty->pc300dev, (void*)buf, count)) { 
481            /* failed to send */
482            CPC_TTY_DBG("%s: trasmition error\n", cpc_tty->name);
483            return 0;
484         }
485         return count; 
486
487
488 /*
489  * PC300 TTY Write Room routine
490  * 
491  * This routine returns the numbers of characteres the tty driver will accept
492  * for queuing to be written. 
493  * o return MTU
494  */
495 static int cpc_tty_write_room(struct tty_struct *tty)
496 {
497         st_cpc_tty_area    *cpc_tty; 
498
499         if (!tty || !tty->driver_data ) { 
500                 CPC_TTY_DBG("hdlcX-tty: no TTY to write room\n");
501                 return -ENODEV;
502         }
503
504         cpc_tty = (st_cpc_tty_area *) tty->driver_data; 
505
506         if ((cpc_tty->tty != tty) ||  (cpc_tty->state != CPC_TTY_ST_OPEN)) { 
507                 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
508                 return -ENODEV; 
509         }
510         
511         CPC_TTY_DBG("%s: write room\n",cpc_tty->name);
512         
513         return CPC_TTY_MAX_MTU;
514
515
516 /*
517  * PC300 TTY chars in buffer routine
518  * 
519  * This routine returns the chars number in the transmission buffer 
520  * o returns 0
521  */
522 static int cpc_tty_chars_in_buffer(struct tty_struct *tty)
523 {
524         st_cpc_tty_area    *cpc_tty; 
525
526         if (!tty || !tty->driver_data ) {
527                 CPC_TTY_DBG("hdlcX-tty: no TTY to chars in buffer\n");
528                 return -ENODEV; 
529         }
530
531         cpc_tty = (st_cpc_tty_area *) tty->driver_data; 
532
533         if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) { 
534                 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
535                 return -ENODEV; 
536         }
537    
538         return(0); 
539
540
541 static int pc300_tiocmset(struct tty_struct *tty, struct file *file,
542                           unsigned int set, unsigned int clear)
543 {
544         st_cpc_tty_area    *cpc_tty; 
545
546         CPC_TTY_DBG("%s: set:%x clear:%x\n", __FUNCTION__, set, clear);
547
548         if (!tty || !tty->driver_data ) {
549                 CPC_TTY_DBG("hdlcX-tty: no TTY to chars in buffer\n");  
550                 return -ENODEV; 
551         }
552
553         cpc_tty = (st_cpc_tty_area *) tty->driver_data; 
554
555         if (set & TIOCM_RTS)
556                 cpc_tty_signal_on(cpc_tty->pc300dev, CTL_RTS);
557         if (set & TIOCM_DTR)
558                 cpc_tty_signal_on(cpc_tty->pc300dev, CTL_DTR);
559
560         if (clear & TIOCM_RTS)
561                 cpc_tty_signal_off(cpc_tty->pc300dev, CTL_RTS);
562         if (clear & TIOCM_DTR)
563                 cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
564
565         return 0;
566 }
567
568 static int pc300_tiocmget(struct tty_struct *tty, struct file *file)
569 {
570         unsigned int result;
571         unsigned char status;
572         unsigned long flags;
573         st_cpc_tty_area  *cpc_tty = (st_cpc_tty_area *) tty->driver_data;
574         pc300dev_t *pc300dev = cpc_tty->pc300dev;
575         pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
576         pc300_t *card = (pc300_t *) pc300chan->card;
577         int ch = pc300chan->channel;
578
579         cpc_tty = (st_cpc_tty_area *) tty->driver_data;
580
581         CPC_TTY_DBG("%s-tty: tiocmget\n",
582                 ((struct net_device*)(pc300dev->hdlc))->name);
583
584         CPC_TTY_LOCK(card, flags);
585         status = cpc_readb(card->hw.scabase+M_REG(CTL,ch));
586         CPC_TTY_UNLOCK(card,flags);
587
588         result = ((status & CTL_DTR) ? TIOCM_DTR : 0) |
589                  ((status & CTL_RTS) ? TIOCM_RTS : 0);
590
591         return result;
592 }
593
594 /*
595  * PC300 TTY Flush Buffer routine
596  *
597  * This routine resets the transmission buffer 
598  */
599 static void cpc_tty_flush_buffer(struct tty_struct *tty)
600
601         st_cpc_tty_area    *cpc_tty; 
602         
603         if (!tty || !tty->driver_data ) {
604                 CPC_TTY_DBG("hdlcX-tty: no TTY to flush buffer\n");     
605                 return; 
606         }
607
608         cpc_tty = (st_cpc_tty_area *) tty->driver_data; 
609
610         if ((cpc_tty->tty != tty) ||  (cpc_tty->state != CPC_TTY_ST_OPEN)) { 
611                 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
612                 return; 
613         }
614
615         CPC_TTY_DBG("%s: call wake_up_interruptible\n",cpc_tty->name);
616
617         tty_wakeup(tty);        
618         return; 
619
620
621 /*
622  * PC300 TTY Hangup routine
623  *
624  * This routine is called by the tty driver to hangup the interface 
625  * o clear DTR signal
626  */
627
628 static void cpc_tty_hangup(struct tty_struct *tty)
629
630         st_cpc_tty_area    *cpc_tty; 
631         int res;
632
633         if (!tty || !tty->driver_data ) {
634                 CPC_TTY_DBG("hdlcX-tty: no TTY to hangup\n");   
635                 return ; 
636         }
637
638         cpc_tty = (st_cpc_tty_area *) tty->driver_data; 
639
640         if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
641                 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
642                 return ;
643         }
644         if (!serial_drv.refcount && cpc_tty_unreg_flag) {
645                 cpc_tty_unreg_flag = 0;
646                 CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
647                 if ((res=tty_unregister_driver(&serial_drv))) { 
648                         CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
649                                                         cpc_tty->name,res);
650                 }
651         }
652         cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
653 }
654
655 /*
656  * PC300 TTY RX work routine
657  * This routine treats RX work
658  * o verify read buffer
659  * o call the line disc. read
660  * o free memory
661  */
662 static void cpc_tty_rx_work(void * data)
663 {
664         unsigned long port;
665         int i, j;
666         st_cpc_tty_area *cpc_tty; 
667         volatile st_cpc_rx_buf *buf;
668         char flags=0,flg_rx=1; 
669         struct tty_ldisc *ld;
670
671         if (cpc_tty_cnt == 0) return;
672
673         
674         for (i=0; (i < 4) && flg_rx ; i++) {
675                 flg_rx = 0;
676                 port = (unsigned long)data;
677                 for (j=0; j < CPC_TTY_NPORTS; j++) {
678                         cpc_tty = &cpc_tty_area[port];
679                 
680                         if ((buf=cpc_tty->buf_rx.first) != 0) {
681                                 if (cpc_tty->tty) {
682                                         ld = tty_ldisc_ref(cpc_tty->tty);
683                                         if (ld) {
684                                                 if (ld->receive_buf) {
685                                                         CPC_TTY_DBG("%s: call line disc. receive_buf\n",cpc_tty->name);
686                                                         ld->receive_buf(cpc_tty->tty, (char *)(buf->data), &flags, buf->size);
687                                                 }
688                                                 tty_ldisc_deref(ld);
689                                         }
690                                 }       
691                                 cpc_tty->buf_rx.first = cpc_tty->buf_rx.first->next;
692                                 kfree((void *)buf);
693                                 buf = cpc_tty->buf_rx.first;
694                                 flg_rx = 1;
695                         }
696                         if (++port == CPC_TTY_NPORTS) port = 0;
697                 }
698         }
699
700
701 /*
702  * PC300 TTY RX work routine
703  *
704  * This routine treats RX interrupt. 
705  * o read all frames in card
706  * o verify the frame size
707  * o read the frame in rx buffer
708  */
709 static void cpc_tty_rx_disc_frame(pc300ch_t *pc300chan)
710 {
711         volatile pcsca_bd_t __iomem * ptdescr; 
712         volatile unsigned char status; 
713         pc300_t *card = (pc300_t *)pc300chan->card; 
714         int ch = pc300chan->channel; 
715
716         /* dma buf read */ 
717         ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase + 
718                                 RX_BD_ADDR(ch, pc300chan->rx_first_bd)); 
719         while (pc300chan->rx_first_bd != pc300chan->rx_last_bd) { 
720                 status = cpc_readb(&ptdescr->status); 
721                 cpc_writeb(&ptdescr->status, 0); 
722                 cpc_writeb(&ptdescr->len, 0); 
723                 pc300chan->rx_first_bd = (pc300chan->rx_first_bd + 1) & 
724                                         (N_DMA_RX_BUF - 1); 
725                 if (status & DST_EOM) { 
726                         break; /* end of message */
727                 }
728                 ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase + cpc_readl(&ptdescr->next)); 
729         }
730 }
731
732 void cpc_tty_receive(pc300dev_t *pc300dev)
733 {
734         st_cpc_tty_area *cpc_tty; 
735         pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan; 
736         pc300_t *card = (pc300_t *)pc300chan->card; 
737         int ch = pc300chan->channel; 
738         volatile pcsca_bd_t  __iomem * ptdescr; 
739         struct net_device_stats *stats = hdlc_stats(pc300dev->dev);
740         int rx_len, rx_aux; 
741         volatile unsigned char status; 
742         unsigned short first_bd = pc300chan->rx_first_bd;
743         st_cpc_rx_buf *new = NULL;
744         unsigned char dsr_rx;
745
746         if (pc300dev->cpc_tty == NULL) { 
747                 return; 
748         }
749
750         dsr_rx = cpc_readb(card->hw.scabase + DSR_RX(ch));
751
752         cpc_tty = (st_cpc_tty_area *)pc300dev->cpc_tty; 
753
754         while (1) { 
755                 rx_len = 0;
756                 ptdescr = (pcsca_bd_t  __iomem *)(card->hw.rambase + RX_BD_ADDR(ch, first_bd));
757                 while ((status = cpc_readb(&ptdescr->status)) & DST_OSB) {
758                         rx_len += cpc_readw(&ptdescr->len);
759                         first_bd = (first_bd + 1) & (N_DMA_RX_BUF - 1);
760                         if (status & DST_EOM) {
761                                 break;
762                         }
763                         ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase+cpc_readl(&ptdescr->next));
764                 }
765                         
766                 if (!rx_len) { 
767                         if (dsr_rx & DSR_BOF) {
768                                 /* update EDA */ 
769                                 cpc_writel(card->hw.scabase + DRX_REG(EDAL, ch), 
770                                                 RX_BD_ADDR(ch, pc300chan->rx_last_bd)); 
771                         }
772                         kfree(new);
773                         return; 
774                 }
775                 
776                 if (rx_len > CPC_TTY_MAX_MTU) { 
777                         /* Free RX descriptors */ 
778                         CPC_TTY_DBG("%s: frame size is invalid.\n",cpc_tty->name);
779                         stats->rx_errors++; 
780                         stats->rx_frame_errors++; 
781                         cpc_tty_rx_disc_frame(pc300chan);
782                         continue;
783                 } 
784                 
785                 new = (st_cpc_rx_buf *)kmalloc(rx_len + sizeof(st_cpc_rx_buf), GFP_ATOMIC);
786                 if (new == 0) {
787                         cpc_tty_rx_disc_frame(pc300chan);
788                         continue;
789                 }
790                 
791                 /* dma buf read */ 
792                 ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase + 
793                                 RX_BD_ADDR(ch, pc300chan->rx_first_bd)); 
794
795                 rx_len = 0;     /* counter frame size */
796                 
797                 while ((status = cpc_readb(&ptdescr->status)) & DST_OSB) {
798                         rx_aux = cpc_readw(&ptdescr->len);
799                         if ((status & (DST_OVR | DST_CRC | DST_RBIT |  DST_SHRT | DST_ABT))
800                                 || (rx_aux > BD_DEF_LEN)) {
801                                 CPC_TTY_DBG("%s: reception error\n", cpc_tty->name);
802                                 stats->rx_errors++; 
803                                 if (status & DST_OVR) { 
804                                         stats->rx_fifo_errors++; 
805                                 }
806                                 if (status & DST_CRC) { 
807                                         stats->rx_crc_errors++; 
808                                 }
809                                 if ((status & (DST_RBIT | DST_SHRT | DST_ABT)) ||
810                                         (rx_aux > BD_DEF_LEN))  { 
811                                         stats->rx_frame_errors++; 
812                                 } 
813                                 /* discard remainig descriptors used by the bad frame */ 
814                                 CPC_TTY_DBG("%s: reception error - discard descriptors",
815                                                 cpc_tty->name);
816                                 cpc_tty_rx_disc_frame(pc300chan);
817                                 rx_len = 0;
818                                 kfree(new);
819                                 new = NULL;
820                                 break; /* read next frame - while(1) */
821                         }
822
823                         if (cpc_tty->state != CPC_TTY_ST_OPEN) {
824                                 /* Free RX descriptors */ 
825                                 cpc_tty_rx_disc_frame(pc300chan);
826                                 stats->rx_dropped++; 
827                                 rx_len = 0; 
828                                 kfree(new);
829                                 new = NULL;
830                                 break; /* read next frame - while(1) */
831                         }
832
833                         /* read the segment of the frame */
834                         if (rx_aux != 0) {
835                                 memcpy_fromio((new->data + rx_len), 
836                                         (void __iomem *)(card->hw.rambase + 
837                                          cpc_readl(&ptdescr->ptbuf)), rx_aux);
838                                 rx_len += rx_aux; 
839                         }
840                         cpc_writeb(&ptdescr->status,0); 
841                         cpc_writeb(&ptdescr->len, 0); 
842                         pc300chan->rx_first_bd = (pc300chan->rx_first_bd + 1) & 
843                                         (N_DMA_RX_BUF -1); 
844                         if (status & DST_EOM)break;
845                         
846                         ptdescr = (pcsca_bd_t __iomem *) (card->hw.rambase + 
847                                         cpc_readl(&ptdescr->next)); 
848                 }
849                 /* update pointer */ 
850                 pc300chan->rx_last_bd = (pc300chan->rx_first_bd - 1) & 
851                                         (N_DMA_RX_BUF - 1) ; 
852                 if (!(dsr_rx & DSR_BOF)) {
853                         /* update EDA */ 
854                         cpc_writel(card->hw.scabase + DRX_REG(EDAL, ch), 
855                                         RX_BD_ADDR(ch, pc300chan->rx_last_bd)); 
856                 }
857                 if (rx_len != 0) { 
858                         stats->rx_bytes += rx_len; 
859                 
860                         if (pc300dev->trace_on) { 
861                                 cpc_tty_trace(pc300dev, new->data,rx_len, 'R'); 
862                         } 
863                         new->size = rx_len;
864                         new->next = NULL;
865                         if (cpc_tty->buf_rx.first == 0) {
866                                 cpc_tty->buf_rx.first = new;
867                                 cpc_tty->buf_rx.last = new;
868                         } else {
869                                 cpc_tty->buf_rx.last->next = new;
870                                 cpc_tty->buf_rx.last = new;
871                         }
872                         schedule_work(&(cpc_tty->tty_rx_work));
873                         stats->rx_packets++;
874                 }
875         } 
876
877
878 /*
879  * PC300 TTY TX work routine
880  * 
881  * This routine treats TX interrupt. 
882  * o if need call line discipline wakeup
883  * o call wake_up_interruptible
884  */
885 static void cpc_tty_tx_work(void *data)
886 {
887         st_cpc_tty_area *cpc_tty = (st_cpc_tty_area *) data; 
888         struct tty_struct *tty; 
889
890         CPC_TTY_DBG("%s: cpc_tty_tx_work init\n",cpc_tty->name);
891         
892         if ((tty = cpc_tty->tty) == 0) { 
893                 CPC_TTY_DBG("%s: the interface is not opened\n",cpc_tty->name);
894                 return; 
895         }
896         tty_wakeup(tty);
897 }
898
899 /*
900  * PC300 TTY send to card routine
901  * 
902  * This routine send data to card. 
903  * o clear descriptors
904  * o write data to DMA buffers
905  * o start the transmission
906  */
907 static int cpc_tty_send_to_card(pc300dev_t *dev,void* buf, int len)
908 {
909         pc300ch_t *chan = (pc300ch_t *)dev->chan; 
910         pc300_t *card = (pc300_t *)chan->card; 
911         int ch = chan->channel; 
912         struct net_device_stats *stats = hdlc_stats(dev->dev);
913         unsigned long flags; 
914         volatile pcsca_bd_t __iomem *ptdescr; 
915         int i, nchar;
916         int tosend = len;
917         int nbuf = ((len - 1)/BD_DEF_LEN) + 1;
918         unsigned char *pdata=buf;
919
920         CPC_TTY_DBG("%s:cpc_tty_send_to_cars len=%i", 
921                         (st_cpc_tty_area *)dev->cpc_tty->name,len);     
922
923         if (nbuf >= card->chan[ch].nfree_tx_bd) {
924                 return 1;
925         }
926         
927         /* write buffer to DMA buffers */ 
928         CPC_TTY_DBG("%s: call dma_buf_write\n",
929                         (st_cpc_tty_area *)dev->cpc_tty->name); 
930         for (i = 0 ; i < nbuf ; i++) {
931                 ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase + 
932                         TX_BD_ADDR(ch, card->chan[ch].tx_next_bd));
933                 nchar = (BD_DEF_LEN > tosend) ? tosend : BD_DEF_LEN;
934                 if (cpc_readb(&ptdescr->status) & DST_OSB) {
935                         memcpy_toio((void __iomem *)(card->hw.rambase + 
936                                 cpc_readl(&ptdescr->ptbuf)), 
937                                 &pdata[len - tosend], 
938                                 nchar);
939                         card->chan[ch].nfree_tx_bd--;
940                         if ((i + 1) == nbuf) {
941                                 /* This must be the last BD to be used */
942                                 cpc_writeb(&ptdescr->status, DST_EOM);
943                         } else {
944                                 cpc_writeb(&ptdescr->status, 0);
945                         }
946                         cpc_writew(&ptdescr->len, nchar);
947                 } else {
948                         CPC_TTY_DBG("%s: error in dma_buf_write\n",
949                                         (st_cpc_tty_area *)dev->cpc_tty->name); 
950                         stats->tx_dropped++;
951                         return 1; 
952                 }
953                 tosend -= nchar;
954                 card->chan[ch].tx_next_bd = 
955                         (card->chan[ch].tx_next_bd + 1) & (N_DMA_TX_BUF - 1);
956         }
957
958         if (dev->trace_on) { 
959                 cpc_tty_trace(dev, buf, len,'T'); 
960         }
961
962         /* start transmission */ 
963         CPC_TTY_DBG("%s: start transmission\n",
964                 (st_cpc_tty_area *)dev->cpc_tty->name); 
965         
966         CPC_TTY_LOCK(card, flags); 
967         cpc_writeb(card->hw.scabase + DTX_REG(EDAL, ch), 
968                         TX_BD_ADDR(ch, chan->tx_next_bd)); 
969         cpc_writeb(card->hw.scabase + M_REG(CMD, ch), CMD_TX_ENA); 
970         cpc_writeb(card->hw.scabase + DSR_TX(ch), DSR_DE); 
971
972         if (card->hw.type == PC300_TE) { 
973                 cpc_writeb(card->hw.falcbase + card->hw.cpld_reg2, 
974                         cpc_readb(card->hw.falcbase + card->hw.cpld_reg2) |
975                         (CPLD_REG2_FALC_LED1 << (2 * ch))); 
976         }
977         CPC_TTY_UNLOCK(card, flags); 
978         return 0; 
979
980
981 /*
982  *      PC300 TTY trace routine
983  *
984  *  This routine send trace of connection to application. 
985  *  o clear descriptors
986  *  o write data to DMA buffers
987  *  o start the transmission
988  */
989
990 static void cpc_tty_trace(pc300dev_t *dev, char* buf, int len, char rxtx)
991 {
992         struct sk_buff *skb; 
993
994         if ((skb = dev_alloc_skb(10 + len)) == NULL) { 
995                 /* out of memory */ 
996                 CPC_TTY_DBG("%s: tty_trace - out of memory\n", dev->dev->name);
997                 return; 
998         }
999
1000         skb_put (skb, 10 + len); 
1001         skb->dev = dev->dev; 
1002         skb->protocol = htons(ETH_P_CUST); 
1003         skb->mac.raw = skb->data; 
1004         skb->pkt_type = PACKET_HOST; 
1005         skb->len = 10 + len; 
1006
1007         memcpy(skb->data,dev->dev->name,5);
1008         skb->data[5] = '['; 
1009         skb->data[6] = rxtx; 
1010         skb->data[7] = ']'; 
1011         skb->data[8] = ':'; 
1012         skb->data[9] = ' '; 
1013         memcpy(&skb->data[10], buf, len); 
1014         netif_rx(skb); 
1015 }       
1016
1017 /*
1018  *      PC300 TTY unregister service routine
1019  *
1020  *      This routine unregister one interface. 
1021  */
1022 void cpc_tty_unregister_service(pc300dev_t *pc300dev)
1023 {
1024         st_cpc_tty_area *cpc_tty; 
1025         ulong flags;
1026         int res;
1027
1028         if ((cpc_tty= (st_cpc_tty_area *) pc300dev->cpc_tty) == 0) { 
1029                 CPC_TTY_DBG("%s: interface is not TTY\n", pc300dev->dev->name);
1030                 return; 
1031         }
1032         CPC_TTY_DBG("%s: cpc_tty_unregister_service", cpc_tty->name);
1033
1034         if (cpc_tty->pc300dev != pc300dev) { 
1035                 CPC_TTY_DBG("%s: invalid tty ptr=%s\n", 
1036                 pc300dev->dev->name, cpc_tty->name);
1037                 return; 
1038         }
1039
1040         if (--cpc_tty_cnt == 0) { 
1041                 if (serial_drv.refcount) {
1042                         CPC_TTY_DBG("%s: unregister is not possible, refcount=%d",
1043                                                         cpc_tty->name, serial_drv.refcount);
1044                         cpc_tty_cnt++;
1045                         cpc_tty_unreg_flag = 1;
1046                         return;
1047                 } else { 
1048                         CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
1049                         if ((res=tty_unregister_driver(&serial_drv))) { 
1050                                 CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
1051                                                                 cpc_tty->name,res);
1052                         }
1053                 }
1054         }
1055         CPC_TTY_LOCK(pc300dev->chan->card,flags);
1056         cpc_tty->tty = NULL; 
1057         CPC_TTY_UNLOCK(pc300dev->chan->card, flags);
1058         cpc_tty->tty_minor = 0; 
1059         cpc_tty->state = CPC_TTY_ST_IDLE; 
1060
1061
1062 /*
1063  * PC300 TTY trigger poll routine
1064  * This routine is called by pc300driver to treats Tx interrupt. 
1065  */
1066 void cpc_tty_trigger_poll(pc300dev_t *pc300dev)
1067 {
1068         st_cpc_tty_area *cpc_tty = (st_cpc_tty_area *)pc300dev->cpc_tty; 
1069         if (!cpc_tty) {
1070                 return;
1071         }
1072         schedule_work(&(cpc_tty->tty_tx_work)); 
1073
1074
1075 /*
1076  * PC300 TTY reset var routine
1077  * This routine is called by pc300driver to init the TTY area. 
1078  */
1079
1080 void cpc_tty_reset_var(void)
1081 {
1082         int i ; 
1083
1084         CPC_TTY_DBG("hdlcX-tty: reset variables\n");
1085         /* reset  the tty_driver structure - serial_drv */ 
1086         memset(&serial_drv, 0, sizeof(struct tty_driver));
1087         for (i=0; i < CPC_TTY_NPORTS; i++){
1088                 memset(&cpc_tty_area[i],0, sizeof(st_cpc_tty_area)); 
1089         }
1090 }