2 * pc300_tty.c Cyclades-PC300(tm) TTY Driver.
4 * Author: Regina Kodato <reginak@cyclades.com>
6 * Copyright: (c) 1999-2002 Cyclades Corp.
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.
13 * $Log: pc300_tty.c,v $
14 * Revision 3.7 2002/03/07 14:17:09 henrique
17 * Revision 3.6 2001/12/10 12:29:42 regina
20 * Revision 3.5 2001/10/31 11:20:05 regina
21 * automatic pppd starts
23 * Revision 3.4 2001/08/06 12:01:51 regina
24 * problem in DSR_DE bit
26 * Revision 3.3 2001/07/26 22:58:41 regina
29 * Revision 3.2 2001/07/12 13:11:20 regina
30 * bug fix - DCD-OFF in pc300 tty driver
32 * DMA transmission bug fix
34 * Revision 3.1 2001/06/22 13:13:02 regina
35 * MLPPP implementation
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>
49 #include <linux/skbuff.h>
51 #include <linux/tty.h>
52 #include <linux/tty_flip.h>
53 #include <linux/serial.h>
56 #include <asm/uaccess.h>
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 */
66 #define CPC_TTY_MAX_MTU 2000
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 */
73 #define CPC_TTY_LOCK(card,flags)\
75 spin_lock_irqsave(&card->card_lock, flags); \
78 #define CPC_TTY_UNLOCK(card,flags) \
80 spin_unlock_irqrestore(&card->card_lock, flags); \
83 //#define CPC_TTY_DBG(format,a...) printk(format,##a)
84 #define CPC_TTY_DBG(format,a...)
87 typedef struct _st_cpc_rx_buf {
88 struct _st_cpc_rx_buf *next;
90 unsigned char data[1];
93 struct st_cpc_rx_list {
98 typedef struct _st_cpc_tty_area {
99 int state; /* state of the TTY interface */
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 */
111 /* TTY data structures */
112 static struct tty_driver serial_drv;
114 /* local variables */
115 st_cpc_tty_area cpc_tty_area[CPC_TTY_NPORTS];
117 int cpc_tty_cnt=0; /* number of intrfaces configured with MLPPP */
118 int cpc_tty_unreg_flag = 0;
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, int from_user,
124 const unsigned char *buf, int count);
125 static int cpc_tty_write_room(struct tty_struct *tty);
126 static int cpc_tty_chars_in_buffer(struct tty_struct *tty);
127 static void cpc_tty_flush_buffer(struct tty_struct *tty);
128 static void cpc_tty_hangup(struct tty_struct *tty);
129 static void cpc_tty_rx_work(void *data);
130 static void cpc_tty_tx_work(void *data);
131 static int cpc_tty_send_to_card(pc300dev_t *dev,void *buf, int len);
132 static void cpc_tty_trace(pc300dev_t *dev, char* buf, int len, char rxtx);
133 static void cpc_tty_signal_off(pc300dev_t *pc300dev, unsigned char);
134 static void cpc_tty_signal_on(pc300dev_t *pc300dev, unsigned char);
136 int pc300_tiocmset(struct tty_struct *, struct file *,
137 unsigned int, unsigned int);
138 int pc300_tiocmget(struct tty_struct *, struct file *);
140 /* functions called by PC300 driver */
141 void cpc_tty_init(pc300dev_t *dev);
142 void cpc_tty_unregister_service(pc300dev_t *pc300dev);
143 void cpc_tty_receive(pc300dev_t *pc300dev);
144 void cpc_tty_trigger_poll(pc300dev_t *pc300dev);
145 void cpc_tty_reset_var(void);
148 * PC300 TTY clear "signal"
150 static void cpc_tty_signal_off(pc300dev_t *pc300dev, unsigned char signal)
152 pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
153 pc300_t *card = (pc300_t *) pc300chan->card;
154 int ch = pc300chan->channel;
157 CPC_TTY_DBG("%s-tty: Clear signal %x\n",
158 pc300dev->dev->name, signal);
159 CPC_TTY_LOCK(card, flags);
160 cpc_writeb(card->hw.scabase + M_REG(CTL,ch),
161 cpc_readb(card->hw.scabase+M_REG(CTL,ch))& signal);
162 CPC_TTY_UNLOCK(card,flags);
166 * PC300 TTY set "signal" to ON
168 static void cpc_tty_signal_on(pc300dev_t *pc300dev, unsigned char signal)
170 pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
171 pc300_t *card = (pc300_t *) pc300chan->card;
172 int ch = pc300chan->channel;
175 CPC_TTY_DBG("%s-tty: Set signal %x\n",
176 pc300dev->dev->name, signal);
177 CPC_TTY_LOCK(card, flags);
178 cpc_writeb(card->hw.scabase + M_REG(CTL,ch),
179 cpc_readb(card->hw.scabase+M_REG(CTL,ch))& ~signal);
180 CPC_TTY_UNLOCK(card,flags);
184 * PC300 TTY initialization routine
186 * This routine is called by the PC300 driver during board configuration
187 * (ioctl=SIOCSP300CONF). At this point the adapter is completely
189 * o verify kernel version (only 2.4.x)
190 * o register TTY driver
191 * o init cpc_tty_area struct
193 void cpc_tty_init(pc300dev_t *pc300dev)
196 st_cpc_tty_area * cpc_tty;
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): %i",
203 CPC_TTY_NPORTS-1,port);
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",
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;
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;
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;
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);
246 memset((void *)cpc_tty_area, 0,
247 sizeof(st_cpc_tty_area) * CPC_TTY_NPORTS);
250 cpc_tty = &cpc_tty_area[port];
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);
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;
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);
267 cpc_tty->buf_rx.first = cpc_tty->buf_rx.last = 0;
269 pc300dev->cpc_tty = (void *)cpc_tty;
271 aux = strlen(pc300dev->dev->name);
272 memcpy(cpc_tty->name, pc300dev->dev->name, aux);
273 memcpy(&cpc_tty->name[aux], "-tty", 5);
275 cpc_open(pc300dev->dev);
276 cpc_tty_signal_off(pc300dev, CTL_DTR);
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);
284 * PC300 TTY OPEN routine
286 * This routine is called by the tty driver to open the interface
288 * o allocate buffer to Rx and Tx
290 static int cpc_tty_open(struct tty_struct *tty, struct file *flip)
293 st_cpc_tty_area *cpc_tty;
301 if ((port < 0) || (port >= CPC_TTY_NPORTS)){
302 CPC_TTY_DBG("pc300_tty: open invalid port %d\n", port);
306 cpc_tty = &cpc_tty_area[port];
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);
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);
323 if (cpc_tty_area[port].buf_rx.first) {
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;
330 cpc_tty_area[port].buf_rx.first = NULL;
331 cpc_tty_area[port].buf_rx.last = NULL;
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];
338 cpc_tty_signal_on(cpc_tty->pc300dev, CTL_DTR);
343 CPC_TTY_DBG("%s: opening TTY driver\n", cpc_tty->name);
345 /* avisar driver PC300 */
350 * PC300 TTY CLOSE routine
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
357 static void cpc_tty_close(struct tty_struct *tty, struct file *flip)
359 st_cpc_tty_area *cpc_tty;
363 if (!tty || !tty->driver_data ) {
364 CPC_TTY_DBG("hdlx-tty: no TTY in close \n");
368 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
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);
375 if (!cpc_tty->num_open) {
376 CPC_TTY_DBG("%s: TTY is closed\n",cpc_tty->name);
380 if (--cpc_tty->num_open > 0) {
381 CPC_TTY_DBG("%s: TTY closed\n",cpc_tty->name);
385 cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
387 CPC_TTY_LOCK(cpc_tty->pc300dev->chan->card, flags); /* lock irq */
389 cpc_tty->state = CPC_TTY_ST_INIT;
390 CPC_TTY_UNLOCK(cpc_tty->pc300dev->chan->card, flags); /* unlock irq */
392 if (cpc_tty->buf_rx.first) {
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;
399 cpc_tty->buf_rx.first = NULL;
400 cpc_tty->buf_rx.last = NULL;
403 if (cpc_tty->buf_tx) {
404 kfree(cpc_tty->buf_tx);
405 cpc_tty->buf_tx = NULL;
408 CPC_TTY_DBG("%s: TTY closed\n",cpc_tty->name);
410 if (!serial_drv.refcount && cpc_tty_unreg_flag) {
411 cpc_tty_unreg_flag = 0;
412 CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
413 if ((res=tty_unregister_driver(&serial_drv))) {
414 CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
422 * PC300 TTY WRITE routine
424 * This routine is called by the tty driver to write a series of characters
425 * to the tty device. The characters may come from user or kernel space.
426 * o verify the DCD signal
427 * o send characters to board and start the transmission
429 static int cpc_tty_write(struct tty_struct *tty, int from_user,
430 const unsigned char *buf, int count)
432 st_cpc_tty_area *cpc_tty;
433 pc300ch_t *pc300chan;
437 struct net_device_stats *stats;
439 if (!tty || !tty->driver_data ) {
440 CPC_TTY_DBG("hdlcX-tty: no TTY in write\n");
444 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
446 if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
447 CPC_TTY_DBG("%s: TTY is not opened\n", cpc_tty->name);
451 if (count > CPC_TTY_MAX_MTU) {
452 CPC_TTY_DBG("%s: count is invalid\n",cpc_tty->name);
453 return -EINVAL; /* frame too big */
456 CPC_TTY_DBG("%s: cpc_tty_write %s data len=%i\n",cpc_tty->name,
457 (from_user)?"from user" : "from kernel",count);
459 pc300chan = (pc300ch_t *)((pc300dev_t*)cpc_tty->pc300dev)->chan;
460 stats = hdlc_stats(((pc300dev_t*)cpc_tty->pc300dev)->dev);
461 card = (pc300_t *) pc300chan->card;
462 ch = pc300chan->channel;
464 /* verify DCD signal*/
465 if (cpc_readb(card->hw.scabase + M_REG(ST3,ch)) & ST3_DCD) {
467 CPC_TTY_DBG("%s : DCD is OFF\n", cpc_tty->name);
469 stats->tx_carrier_errors++;
470 CPC_TTY_LOCK(card, flags);
471 cpc_writeb(card->hw.scabase + M_REG(CMD, ch), CMD_TX_BUF_CLR);
473 if (card->hw.type == PC300_TE) {
474 cpc_writeb(card->hw.falcbase + card->hw.cpld_reg2,
475 cpc_readb(card->hw.falcbase + card->hw.cpld_reg2) &
476 ~(CPLD_REG2_FALC_LED1 << (2 *ch)));
479 CPC_TTY_UNLOCK(card, flags);
485 unsigned char *buf_tmp;
487 buf_tmp = cpc_tty->buf_tx;
488 if (copy_from_user(buf_tmp, buf, count)) {
489 /* failed to copy from user */
490 CPC_TTY_DBG("%s: error in copy from user\n",cpc_tty->name);
494 if (cpc_tty_send_to_card(cpc_tty->pc300dev, (void*) buf_tmp,count)) {
496 CPC_TTY_DBG("%s: transmission error\n",cpc_tty->name);
500 if (cpc_tty_send_to_card(cpc_tty->pc300dev, (void*)buf, count)) {
502 CPC_TTY_DBG("%s: trasmition error\n", cpc_tty->name);
510 * PC300 TTY Write Room routine
512 * This routine returns the numbers of characteres the tty driver will accept
513 * for queuing to be written.
516 static int cpc_tty_write_room(struct tty_struct *tty)
518 st_cpc_tty_area *cpc_tty;
520 if (!tty || !tty->driver_data ) {
521 CPC_TTY_DBG("hdlcX-tty: no TTY to write room\n");
525 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
527 if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
528 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
532 CPC_TTY_DBG("%s: write room\n",cpc_tty->name);
534 return CPC_TTY_MAX_MTU;
538 * PC300 TTY chars in buffer routine
540 * This routine returns the chars number in the transmission buffer
543 static int cpc_tty_chars_in_buffer(struct tty_struct *tty)
545 st_cpc_tty_area *cpc_tty;
547 if (!tty || !tty->driver_data ) {
548 CPC_TTY_DBG("hdlcX-tty: no TTY to chars in buffer\n");
552 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
554 if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
555 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
562 int pc300_tiocmset(struct tty_struct *tty, struct file *file,
563 unsigned int set, unsigned int clear)
565 st_cpc_tty_area *cpc_tty;
567 CPC_TTY_DBG("%s: set:%x clear:%x\n", __FUNCTION__, set, clear);
569 if (!tty || !tty->driver_data ) {
570 CPC_TTY_DBG("hdlcX-tty: no TTY to chars in buffer\n");
574 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
577 cpc_tty_signal_on(cpc_tty->pc300dev, CTL_RTS);
579 cpc_tty_signal_on(cpc_tty->pc300dev, CTL_DTR);
581 if (clear & TIOCM_RTS)
582 cpc_tty_signal_off(cpc_tty->pc300dev, CTL_RTS);
583 if (clear & TIOCM_DTR)
584 cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
589 int pc300_tiocmget(struct tty_struct *tty, struct file *file)
592 unsigned char status;
594 st_cpc_tty_area *cpc_tty = (st_cpc_tty_area *) tty->driver_data;
595 pc300dev_t *pc300dev = cpc_tty->pc300dev;
596 pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
597 pc300_t *card = (pc300_t *) pc300chan->card;
598 int ch = pc300chan->channel;
600 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
602 CPC_TTY_DBG("%s-tty: tiocmget\n",
603 ((struct net_device*)(pc300dev->hdlc))->name);
605 CPC_TTY_LOCK(card, flags);
606 status = cpc_readb(card->hw.scabase+M_REG(CTL,ch));
607 CPC_TTY_UNLOCK(card,flags);
609 result = ((status & CTL_DTR) ? TIOCM_DTR : 0) |
610 ((status & CTL_RTS) ? TIOCM_RTS : 0);
616 * PC300 TTY Flush Buffer routine
618 * This routine resets the transmission buffer
620 static void cpc_tty_flush_buffer(struct tty_struct *tty)
622 st_cpc_tty_area *cpc_tty;
624 if (!tty || !tty->driver_data ) {
625 CPC_TTY_DBG("hdlcX-tty: no TTY to flush buffer\n");
629 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
631 if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
632 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
636 CPC_TTY_DBG("%s: call wake_up_interruptible\n",cpc_tty->name);
638 wake_up_interruptible(&tty->write_wait);
640 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup){
641 CPC_TTY_DBG("%s: call line disc. wake up\n",cpc_tty->name);
642 tty->ldisc.write_wakeup(tty);
649 * PC300 TTY Hangup routine
651 * This routine is called by the tty driver to hangup the interface
655 static void cpc_tty_hangup(struct tty_struct *tty)
657 st_cpc_tty_area *cpc_tty;
660 if (!tty || !tty->driver_data ) {
661 CPC_TTY_DBG("hdlcX-tty: no TTY to hangup\n");
665 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
667 if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
668 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
671 if (!serial_drv.refcount && cpc_tty_unreg_flag) {
672 cpc_tty_unreg_flag = 0;
673 CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
674 if ((res=tty_unregister_driver(&serial_drv))) {
675 CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
679 cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
683 * PC300 TTY RX work routine
684 * This routine treats RX work
685 * o verify read buffer
686 * o call the line disc. read
689 static void cpc_tty_rx_work(void * data)
692 st_cpc_tty_area *cpc_tty;
693 volatile st_cpc_rx_buf * buf;
694 char flags=0,flg_rx=1;
696 if (cpc_tty_cnt == 0) return;
698 for (i=0; (i < 4) && flg_rx ; i++) {
701 for (j=0; j < CPC_TTY_NPORTS; j++) {
702 cpc_tty = &cpc_tty_area[port];
704 if ((buf=cpc_tty->buf_rx.first) != 0) {
706 if (cpc_tty->tty && (cpc_tty->tty->ldisc.receive_buf)) {
707 CPC_TTY_DBG("%s: call line disc. receive_buf\n",cpc_tty->name);
708 cpc_tty->tty->ldisc.receive_buf(cpc_tty->tty, (char *)(buf->data),
711 cpc_tty->buf_rx.first = cpc_tty->buf_rx.first->next;
712 kfree((unsigned char *)buf);
713 buf = cpc_tty->buf_rx.first;
716 if (++port == CPC_TTY_NPORTS) port = 0;
722 * PC300 TTY RX work routine
724 * This routine treats RX interrupt.
725 * o read all frames in card
726 * o verify the frame size
727 * o read the frame in rx buffer
729 static void cpc_tty_rx_disc_frame(pc300ch_t *pc300chan)
731 volatile pcsca_bd_t * ptdescr;
732 volatile unsigned char status;
733 pc300_t *card = (pc300_t *)pc300chan->card;
734 int ch = pc300chan->channel;
737 ptdescr = (pcsca_bd_t *)(card->hw.rambase +
738 RX_BD_ADDR(ch, pc300chan->rx_first_bd));
739 while (pc300chan->rx_first_bd != pc300chan->rx_last_bd) {
740 status = cpc_readb(&ptdescr->status);
741 cpc_writeb(&ptdescr->status, 0);
742 cpc_writeb(&ptdescr->len, 0);
743 pc300chan->rx_first_bd = (pc300chan->rx_first_bd + 1) &
745 if (status & DST_EOM) {
746 break; /* end of message */
748 ptdescr = (pcsca_bd_t *)(card->hw.rambase + cpc_readl(&ptdescr->next));
752 void cpc_tty_receive(pc300dev_t *pc300dev)
754 st_cpc_tty_area *cpc_tty;
755 pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
756 pc300_t *card = (pc300_t *)pc300chan->card;
757 int ch = pc300chan->channel;
758 volatile pcsca_bd_t * ptdescr;
759 struct net_device_stats *stats = hdlc_stats(pc300dev->dev);
761 volatile unsigned char status;
762 unsigned short first_bd = pc300chan->rx_first_bd;
764 unsigned char dsr_rx;
766 if (pc300dev->cpc_tty == NULL) {
770 dsr_rx = cpc_readb(card->hw.scabase + DSR_RX(ch));
772 cpc_tty = (st_cpc_tty_area *)pc300dev->cpc_tty;
776 ptdescr = (pcsca_bd_t *)(card->hw.rambase + RX_BD_ADDR(ch, first_bd));
777 while ((status = cpc_readb(&ptdescr->status)) & DST_OSB) {
778 rx_len += cpc_readw(&ptdescr->len);
779 first_bd = (first_bd + 1) & (N_DMA_RX_BUF - 1);
780 if (status & DST_EOM) {
783 ptdescr=(pcsca_bd_t*)(card->hw.rambase+cpc_readl(&ptdescr->next));
787 if (dsr_rx & DSR_BOF) {
789 cpc_writel(card->hw.scabase + DRX_REG(EDAL, ch),
790 RX_BD_ADDR(ch, pc300chan->rx_last_bd));
795 if (rx_len > CPC_TTY_MAX_MTU) {
796 /* Free RX descriptors */
797 CPC_TTY_DBG("%s: frame size is invalid.\n",cpc_tty->name);
799 stats->rx_frame_errors++;
800 cpc_tty_rx_disc_frame(pc300chan);
804 new = (st_cpc_rx_buf *) kmalloc(rx_len + sizeof(st_cpc_rx_buf), GFP_ATOMIC);
806 cpc_tty_rx_disc_frame(pc300chan);
811 ptdescr = (pcsca_bd_t *)(card->hw.rambase +
812 RX_BD_ADDR(ch, pc300chan->rx_first_bd));
814 rx_len = 0; /* counter frame size */
816 while ((status = cpc_readb(&ptdescr->status)) & DST_OSB) {
817 rx_aux = cpc_readw(&ptdescr->len);
818 if ((status & (DST_OVR | DST_CRC | DST_RBIT | DST_SHRT | DST_ABT))
819 || (rx_aux > BD_DEF_LEN)) {
820 CPC_TTY_DBG("%s: reception error\n", cpc_tty->name);
822 if (status & DST_OVR) {
823 stats->rx_fifo_errors++;
825 if (status & DST_CRC) {
826 stats->rx_crc_errors++;
828 if ((status & (DST_RBIT | DST_SHRT | DST_ABT)) ||
829 (rx_aux > BD_DEF_LEN)) {
830 stats->rx_frame_errors++;
832 /* discard remainig descriptors used by the bad frame */
833 CPC_TTY_DBG("%s: reception error - discard descriptors",
835 cpc_tty_rx_disc_frame(pc300chan);
837 kfree((unsigned char *)new);
838 break; /* read next frame - while(1) */
841 if (cpc_tty->state != CPC_TTY_ST_OPEN) {
842 /* Free RX descriptors */
843 cpc_tty_rx_disc_frame(pc300chan);
846 kfree((unsigned char *)new);
847 break; /* read next frame - while(1) */
850 /* read the segment of the frame */
852 memcpy_fromio((new->data + rx_len),
853 (void *)(card->hw.rambase +
854 cpc_readl(&ptdescr->ptbuf)), rx_aux);
857 cpc_writeb(&ptdescr->status,0);
858 cpc_writeb(&ptdescr->len, 0);
859 pc300chan->rx_first_bd = (pc300chan->rx_first_bd + 1) &
861 if (status & DST_EOM)break;
863 ptdescr = (pcsca_bd_t *) (card->hw.rambase +
864 cpc_readl(&ptdescr->next));
867 pc300chan->rx_last_bd = (pc300chan->rx_first_bd - 1) &
869 if (!(dsr_rx & DSR_BOF)) {
871 cpc_writel(card->hw.scabase + DRX_REG(EDAL, ch),
872 RX_BD_ADDR(ch, pc300chan->rx_last_bd));
875 stats->rx_bytes += rx_len;
877 if (pc300dev->trace_on) {
878 cpc_tty_trace(pc300dev, new->data,rx_len, 'R');
882 if (cpc_tty->buf_rx.first == 0) {
883 cpc_tty->buf_rx.first = new;
884 cpc_tty->buf_rx.last = new;
886 cpc_tty->buf_rx.last->next = new;
887 cpc_tty->buf_rx.last = new;
889 schedule_work(&(cpc_tty->tty_rx_work));
896 * PC300 TTY TX work routine
898 * This routine treats TX interrupt.
899 * o if need call line discipline wakeup
900 * o call wake_up_interruptible
902 static void cpc_tty_tx_work(void *data)
904 st_cpc_tty_area *cpc_tty = (st_cpc_tty_area *) data;
905 struct tty_struct *tty;
907 CPC_TTY_DBG("%s: cpc_tty_tx_work init\n",cpc_tty->name);
909 if ((tty = cpc_tty->tty) == 0) {
910 CPC_TTY_DBG("%s: the interface is not opened\n",cpc_tty->name);
914 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup){
915 CPC_TTY_DBG("%s:call line disc. wakeup\n",cpc_tty->name);
916 tty->ldisc.write_wakeup (tty);
919 wake_up_interruptible(&tty->write_wait);
923 * PC300 TTY send to card routine
925 * This routine send data to card.
926 * o clear descriptors
927 * o write data to DMA buffers
928 * o start the transmission
930 static int cpc_tty_send_to_card(pc300dev_t *dev,void* buf, int len)
932 pc300ch_t *chan = (pc300ch_t *)dev->chan;
933 pc300_t *card = (pc300_t *)chan->card;
934 int ch = chan->channel;
935 struct net_device_stats *stats = hdlc_stats(dev->dev);
937 volatile pcsca_bd_t * ptdescr;
940 int nbuf = ((len - 1)/BD_DEF_LEN) + 1;
941 unsigned char *pdata=buf;
943 CPC_TTY_DBG("%s:cpc_tty_send_to_cars len=%i",
944 (st_cpc_tty_area *)dev->cpc_tty->name,len);
946 if (nbuf >= card->chan[ch].nfree_tx_bd) {
950 /* write buffer to DMA buffers */
951 CPC_TTY_DBG("%s: call dma_buf_write\n",
952 (st_cpc_tty_area *)dev->cpc_tty->name);
953 for (i = 0 ; i < nbuf ; i++) {
954 ptdescr = (pcsca_bd_t *)(card->hw.rambase +
955 TX_BD_ADDR(ch, card->chan[ch].tx_next_bd));
956 nchar = (BD_DEF_LEN > tosend) ? tosend : BD_DEF_LEN;
957 if (cpc_readb(&ptdescr->status) & DST_OSB) {
958 memcpy_toio((void *)(card->hw.rambase +
959 cpc_readl(&ptdescr->ptbuf)),
960 &pdata[len - tosend],
962 card->chan[ch].nfree_tx_bd--;
963 if ((i + 1) == nbuf) {
964 /* This must be the last BD to be used */
965 cpc_writeb(&ptdescr->status, DST_EOM);
967 cpc_writeb(&ptdescr->status, 0);
969 cpc_writew(&ptdescr->len, nchar);
971 CPC_TTY_DBG("%s: error in dma_buf_write\n",
972 (st_cpc_tty_area *)dev->cpc_tty->name);
977 card->chan[ch].tx_next_bd =
978 (card->chan[ch].tx_next_bd + 1) & (N_DMA_TX_BUF - 1);
982 cpc_tty_trace(dev, buf, len,'T');
985 /* start transmission */
986 CPC_TTY_DBG("%s: start transmission\n",
987 (st_cpc_tty_area *)dev->cpc_tty->name);
989 CPC_TTY_LOCK(card, flags);
990 cpc_writeb(card->hw.scabase + DTX_REG(EDAL, ch),
991 TX_BD_ADDR(ch, chan->tx_next_bd));
992 cpc_writeb(card->hw.scabase + M_REG(CMD, ch), CMD_TX_ENA);
993 cpc_writeb(card->hw.scabase + DSR_TX(ch), DSR_DE);
995 if (card->hw.type == PC300_TE) {
996 cpc_writeb(card->hw.falcbase + card->hw.cpld_reg2,
997 cpc_readb(card->hw.falcbase + card->hw.cpld_reg2) |
998 (CPLD_REG2_FALC_LED1 << (2 * ch)));
1000 CPC_TTY_UNLOCK(card, flags);
1005 * PC300 TTY trace routine
1007 * This routine send trace of connection to application.
1008 * o clear descriptors
1009 * o write data to DMA buffers
1010 * o start the transmission
1013 static void cpc_tty_trace(pc300dev_t *dev, char* buf, int len, char rxtx)
1015 struct sk_buff *skb;
1017 if ((skb = dev_alloc_skb(10 + len)) == NULL) {
1019 CPC_TTY_DBG("%s: tty_trace - out of memory\n", dev->dev->name);
1023 skb_put (skb, 10 + len);
1024 skb->dev = dev->dev;
1025 skb->protocol = htons(ETH_P_CUST);
1026 skb->mac.raw = skb->data;
1027 skb->pkt_type = PACKET_HOST;
1028 skb->len = 10 + len;
1030 memcpy(skb->data,dev->dev->name,5);
1032 skb->data[6] = rxtx;
1036 memcpy(&skb->data[10], buf, len);
1041 * PC300 TTY unregister service routine
1043 * This routine unregister one interface.
1045 void cpc_tty_unregister_service(pc300dev_t *pc300dev)
1047 st_cpc_tty_area *cpc_tty;
1051 if ((cpc_tty= (st_cpc_tty_area *) pc300dev->cpc_tty) == 0) {
1052 CPC_TTY_DBG("%s: interface is not TTY\n", pc300dev->dev->name);
1055 CPC_TTY_DBG("%s: cpc_tty_unregister_service", cpc_tty->name);
1057 if (cpc_tty->pc300dev != pc300dev) {
1058 CPC_TTY_DBG("%s: invalid tty ptr=%s\n",
1059 pc300dev->dev->name, cpc_tty->name);
1063 if (--cpc_tty_cnt == 0) {
1064 if (serial_drv.refcount) {
1065 CPC_TTY_DBG("%s: unregister is not possible, refcount=%d",
1066 cpc_tty->name, serial_drv.refcount);
1068 cpc_tty_unreg_flag = 1;
1071 CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
1072 if ((res=tty_unregister_driver(&serial_drv))) {
1073 CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
1078 CPC_TTY_LOCK(pc300dev->chan->card,flags);
1079 cpc_tty->tty = NULL;
1080 CPC_TTY_UNLOCK(pc300dev->chan->card, flags);
1081 cpc_tty->tty_minor = 0;
1082 cpc_tty->state = CPC_TTY_ST_IDLE;
1086 * PC300 TTY trigger poll routine
1087 * This routine is called by pc300driver to treats Tx interrupt.
1089 void cpc_tty_trigger_poll(pc300dev_t *pc300dev)
1091 st_cpc_tty_area *cpc_tty = (st_cpc_tty_area *)pc300dev->cpc_tty;
1095 schedule_work(&(cpc_tty->tty_tx_work));
1099 * PC300 TTY reset var routine
1100 * This routine is called by pc300driver to init the TTY area.
1103 void cpc_tty_reset_var(void)
1107 CPC_TTY_DBG("hdlcX-tty: reset variables\n");
1108 /* reset the tty_driver structure - serial_drv */
1109 memset(&serial_drv, 0, sizeof(struct tty_driver));
1110 for (i=0; i < CPC_TTY_NPORTS; i++){
1111 memset(&cpc_tty_area[i],0, sizeof(st_cpc_tty_area));