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/errno.h>
42 #include <linux/string.h>
43 #include <linux/init.h>
44 #include <linux/netdevice.h>
45 #include <linux/spinlock.h>
46 #include <linux/slab.h>
48 #include <linux/skbuff.h>
50 #include <linux/tty.h>
51 #include <linux/tty_flip.h>
52 #include <linux/serial.h>
55 #include <asm/uaccess.h>
59 /* defines and macros */
60 /* TTY Global definitions */
61 #define CPC_TTY_NPORTS 8 /* maximum number of the sync tty connections */
62 #define CPC_TTY_MAJOR CYCLADES_MAJOR
63 #define CPC_TTY_MINOR_START 240 /* minor of the first PC300 interface */
65 #define CPC_TTY_MAX_MTU 2000
67 /* tty interface state */
68 #define CPC_TTY_ST_IDLE 0
69 #define CPC_TTY_ST_INIT 1 /* configured with MLPPP and up */
70 #define CPC_TTY_ST_OPEN 2 /* opened by application */
72 #define CPC_TTY_LOCK(card,flags)\
74 spin_lock_irqsave(&card->card_lock, flags); \
77 #define CPC_TTY_UNLOCK(card,flags) \
79 spin_unlock_irqrestore(&card->card_lock, flags); \
82 //#define CPC_TTY_DBG(format,a...) printk(format,##a)
83 #define CPC_TTY_DBG(format,a...)
86 typedef struct _st_cpc_rx_buf {
87 struct _st_cpc_rx_buf *next;
89 unsigned char data[1];
92 struct st_cpc_rx_list {
97 typedef struct _st_cpc_tty_area {
98 int state; /* state of the TTY interface */
100 unsigned int tty_minor; /* minor this interface */
101 volatile struct st_cpc_rx_list buf_rx; /* ptr. to reception buffer */
102 unsigned char* buf_tx; /* ptr. to transmission buffer */
103 pc300dev_t* pc300dev; /* ptr. to info struct in PC300 driver */
104 unsigned char name[20]; /* interf. name + "-tty" */
105 struct tty_struct *tty;
106 struct work_struct tty_tx_work; /* tx work - tx interrupt */
107 struct work_struct tty_rx_work; /* rx work - rx interrupt */
110 /* TTY data structures */
111 static struct tty_driver serial_drv;
113 /* local variables */
114 static st_cpc_tty_area cpc_tty_area[CPC_TTY_NPORTS];
116 static int cpc_tty_cnt = 0; /* number of intrfaces configured with MLPPP */
117 static int cpc_tty_unreg_flag = 0;
119 /* TTY functions prototype */
120 static int cpc_tty_open(struct tty_struct *tty, struct file *flip);
121 static void cpc_tty_close(struct tty_struct *tty, struct file *flip);
122 static int cpc_tty_write(struct tty_struct *tty, const unsigned char *buf, int count);
123 static int cpc_tty_write_room(struct tty_struct *tty);
124 static int cpc_tty_chars_in_buffer(struct tty_struct *tty);
125 static void cpc_tty_flush_buffer(struct tty_struct *tty);
126 static void cpc_tty_hangup(struct tty_struct *tty);
127 static void cpc_tty_rx_work(struct work_struct *work);
128 static void cpc_tty_tx_work(struct work_struct *work);
129 static int cpc_tty_send_to_card(pc300dev_t *dev,void *buf, int len);
130 static void cpc_tty_trace(pc300dev_t *dev, char* buf, int len, char rxtx);
131 static void cpc_tty_signal_off(pc300dev_t *pc300dev, unsigned char);
132 static void cpc_tty_signal_on(pc300dev_t *pc300dev, unsigned char);
134 static int pc300_tiocmset(struct tty_struct *, struct file *,
135 unsigned int, unsigned int);
136 static int pc300_tiocmget(struct tty_struct *);
138 /* functions called by PC300 driver */
139 void cpc_tty_init(pc300dev_t *dev);
140 void cpc_tty_unregister_service(pc300dev_t *pc300dev);
141 void cpc_tty_receive(pc300dev_t *pc300dev);
142 void cpc_tty_trigger_poll(pc300dev_t *pc300dev);
143 void cpc_tty_reset_var(void);
146 * PC300 TTY clear "signal"
148 static void cpc_tty_signal_off(pc300dev_t *pc300dev, unsigned char signal)
150 pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
151 pc300_t *card = (pc300_t *) pc300chan->card;
152 int ch = pc300chan->channel;
155 CPC_TTY_DBG("%s-tty: Clear signal %x\n",
156 pc300dev->dev->name, signal);
157 CPC_TTY_LOCK(card, flags);
158 cpc_writeb(card->hw.scabase + M_REG(CTL,ch),
159 cpc_readb(card->hw.scabase+M_REG(CTL,ch))& signal);
160 CPC_TTY_UNLOCK(card,flags);
164 * PC300 TTY set "signal" to ON
166 static void cpc_tty_signal_on(pc300dev_t *pc300dev, unsigned char signal)
168 pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
169 pc300_t *card = (pc300_t *) pc300chan->card;
170 int ch = pc300chan->channel;
173 CPC_TTY_DBG("%s-tty: Set signal %x\n",
174 pc300dev->dev->name, signal);
175 CPC_TTY_LOCK(card, flags);
176 cpc_writeb(card->hw.scabase + M_REG(CTL,ch),
177 cpc_readb(card->hw.scabase+M_REG(CTL,ch))& ~signal);
178 CPC_TTY_UNLOCK(card,flags);
182 static const struct tty_operations pc300_ops = {
183 .open = cpc_tty_open,
184 .close = cpc_tty_close,
185 .write = cpc_tty_write,
186 .write_room = cpc_tty_write_room,
187 .chars_in_buffer = cpc_tty_chars_in_buffer,
188 .tiocmset = pc300_tiocmset,
189 .tiocmget = pc300_tiocmget,
190 .flush_buffer = cpc_tty_flush_buffer,
191 .hangup = cpc_tty_hangup,
196 * PC300 TTY initialization routine
198 * This routine is called by the PC300 driver during board configuration
199 * (ioctl=SIOCSP300CONF). At this point the adapter is completely
201 * o verify kernel version (only 2.4.x)
202 * o register TTY driver
203 * o init cpc_tty_area struct
205 void cpc_tty_init(pc300dev_t *pc300dev)
209 st_cpc_tty_area * cpc_tty;
211 /* hdlcX - X=interface number */
212 port = pc300dev->dev->name[4] - '0';
213 if (port >= CPC_TTY_NPORTS) {
214 printk("%s-tty: invalid interface selected (0-%i): %li",
216 CPC_TTY_NPORTS-1,port);
220 if (cpc_tty_cnt == 0) { /* first TTY connection -> register driver */
221 CPC_TTY_DBG("%s-tty: driver init, major:%i, minor range:%i=%i\n",
223 CPC_TTY_MAJOR, CPC_TTY_MINOR_START,
224 CPC_TTY_MINOR_START+CPC_TTY_NPORTS);
225 /* initialize tty driver struct */
226 memset(&serial_drv,0,sizeof(struct tty_driver));
227 serial_drv.magic = TTY_DRIVER_MAGIC;
228 serial_drv.owner = THIS_MODULE;
229 serial_drv.driver_name = "pc300_tty";
230 serial_drv.name = "ttyCP";
231 serial_drv.major = CPC_TTY_MAJOR;
232 serial_drv.minor_start = CPC_TTY_MINOR_START;
233 serial_drv.num = CPC_TTY_NPORTS;
234 serial_drv.type = TTY_DRIVER_TYPE_SERIAL;
235 serial_drv.subtype = SERIAL_TYPE_NORMAL;
237 serial_drv.init_termios = tty_std_termios;
238 serial_drv.init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
239 serial_drv.flags = TTY_DRIVER_REAL_RAW;
241 /* interface routines from the upper tty layer to the tty driver */
242 tty_set_operations(&serial_drv, &pc300_ops);
244 /* register the TTY driver */
245 if (tty_register_driver(&serial_drv)) {
246 printk("%s-tty: Failed to register serial driver! ",
247 pc300dev->dev->name);
251 memset((void *)cpc_tty_area, 0,
252 sizeof(st_cpc_tty_area) * CPC_TTY_NPORTS);
255 cpc_tty = &cpc_tty_area[port];
257 if (cpc_tty->state != CPC_TTY_ST_IDLE) {
258 CPC_TTY_DBG("%s-tty: TTY port %i, already in use.\n",
259 pc300dev->dev->name, port);
264 cpc_tty->state = CPC_TTY_ST_INIT;
265 cpc_tty->num_open= 0;
266 cpc_tty->tty_minor = port + CPC_TTY_MINOR_START;
267 cpc_tty->pc300dev = pc300dev;
269 INIT_WORK(&cpc_tty->tty_tx_work, cpc_tty_tx_work);
270 INIT_WORK(&cpc_tty->tty_rx_work, cpc_tty_rx_work);
272 cpc_tty->buf_rx.first = cpc_tty->buf_rx.last = NULL;
274 pc300dev->cpc_tty = (void *)cpc_tty;
276 aux = strlen(pc300dev->dev->name);
277 memcpy(cpc_tty->name, pc300dev->dev->name, aux);
278 memcpy(&cpc_tty->name[aux], "-tty", 5);
280 cpc_open(pc300dev->dev);
281 cpc_tty_signal_off(pc300dev, CTL_DTR);
283 CPC_TTY_DBG("%s: Initializing TTY Sync Driver, tty major#%d minor#%i\n",
284 cpc_tty->name,CPC_TTY_MAJOR,cpc_tty->tty_minor);
289 * PC300 TTY OPEN routine
291 * This routine is called by the tty driver to open the interface
293 * o allocate buffer to Rx and Tx
295 static int cpc_tty_open(struct tty_struct *tty, struct file *flip)
298 st_cpc_tty_area *cpc_tty;
306 if ((port < 0) || (port >= CPC_TTY_NPORTS)){
307 CPC_TTY_DBG("pc300_tty: open invalid port %d\n", port);
311 cpc_tty = &cpc_tty_area[port];
313 if (cpc_tty->state == CPC_TTY_ST_IDLE){
314 CPC_TTY_DBG("%s: open - invalid interface, port=%d\n",
315 cpc_tty->name, tty->index);
319 if (cpc_tty->num_open == 0) { /* first open of this tty */
320 if (!cpc_tty_area[port].buf_tx){
321 cpc_tty_area[port].buf_tx = kmalloc(CPC_TTY_MAX_MTU,GFP_KERNEL);
322 if (!cpc_tty_area[port].buf_tx) {
323 CPC_TTY_DBG("%s: error in memory allocation\n",cpc_tty->name);
328 if (cpc_tty_area[port].buf_rx.first) {
330 while (cpc_tty_area[port].buf_rx.first) {
331 aux = (unsigned char *)cpc_tty_area[port].buf_rx.first;
332 cpc_tty_area[port].buf_rx.first = cpc_tty_area[port].buf_rx.first->next;
335 cpc_tty_area[port].buf_rx.first = NULL;
336 cpc_tty_area[port].buf_rx.last = NULL;
339 cpc_tty_area[port].state = CPC_TTY_ST_OPEN;
340 cpc_tty_area[port].tty = tty;
341 tty->driver_data = &cpc_tty_area[port];
343 cpc_tty_signal_on(cpc_tty->pc300dev, CTL_DTR);
348 CPC_TTY_DBG("%s: opening TTY driver\n", cpc_tty->name);
350 /* avisar driver PC300 */
355 * PC300 TTY CLOSE routine
357 * This routine is called by the tty driver to close the interface
358 * o call close channel in PC300 driver (cpc_closech)
359 * o free Rx and Tx buffers
362 static void cpc_tty_close(struct tty_struct *tty, struct file *flip)
364 st_cpc_tty_area *cpc_tty;
368 if (!tty || !tty->driver_data ) {
369 CPC_TTY_DBG("hdlx-tty: no TTY in close\n");
373 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
375 if ((cpc_tty->tty != tty)|| (cpc_tty->state != CPC_TTY_ST_OPEN)) {
376 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
380 if (!cpc_tty->num_open) {
381 CPC_TTY_DBG("%s: TTY is closed\n",cpc_tty->name);
385 if (--cpc_tty->num_open > 0) {
386 CPC_TTY_DBG("%s: TTY closed\n",cpc_tty->name);
390 cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
392 CPC_TTY_LOCK(cpc_tty->pc300dev->chan->card, flags); /* lock irq */
394 cpc_tty->state = CPC_TTY_ST_INIT;
395 CPC_TTY_UNLOCK(cpc_tty->pc300dev->chan->card, flags); /* unlock irq */
397 if (cpc_tty->buf_rx.first) {
399 while (cpc_tty->buf_rx.first) {
400 aux = (unsigned char *)cpc_tty->buf_rx.first;
401 cpc_tty->buf_rx.first = cpc_tty->buf_rx.first->next;
404 cpc_tty->buf_rx.first = NULL;
405 cpc_tty->buf_rx.last = NULL;
408 kfree(cpc_tty->buf_tx);
409 cpc_tty->buf_tx = NULL;
411 CPC_TTY_DBG("%s: TTY closed\n",cpc_tty->name);
413 if (!serial_drv.refcount && cpc_tty_unreg_flag) {
414 cpc_tty_unreg_flag = 0;
415 CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
416 if ((res=tty_unregister_driver(&serial_drv))) {
417 CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
425 * PC300 TTY WRITE routine
427 * This routine is called by the tty driver to write a series of characters
428 * to the tty device. The characters may come from user or kernel space.
429 * o verify the DCD signal
430 * o send characters to board and start the transmission
432 static int cpc_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
434 st_cpc_tty_area *cpc_tty;
435 pc300ch_t *pc300chan;
439 struct net_device_stats *stats;
441 if (!tty || !tty->driver_data ) {
442 CPC_TTY_DBG("hdlcX-tty: no TTY in write\n");
446 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
448 if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
449 CPC_TTY_DBG("%s: TTY is not opened\n", cpc_tty->name);
453 if (count > CPC_TTY_MAX_MTU) {
454 CPC_TTY_DBG("%s: count is invalid\n",cpc_tty->name);
455 return -EINVAL; /* frame too big */
458 CPC_TTY_DBG("%s: cpc_tty_write data len=%i\n",cpc_tty->name,count);
460 pc300chan = (pc300ch_t *)((pc300dev_t*)cpc_tty->pc300dev)->chan;
461 stats = &cpc_tty->pc300dev->dev->stats;
462 card = (pc300_t *) pc300chan->card;
463 ch = pc300chan->channel;
465 /* verify DCD signal*/
466 if (cpc_readb(card->hw.scabase + M_REG(ST3,ch)) & ST3_DCD) {
468 CPC_TTY_DBG("%s : DCD is OFF\n", cpc_tty->name);
470 stats->tx_carrier_errors++;
471 CPC_TTY_LOCK(card, flags);
472 cpc_writeb(card->hw.scabase + M_REG(CMD, ch), CMD_TX_BUF_CLR);
474 if (card->hw.type == PC300_TE) {
475 cpc_writeb(card->hw.falcbase + card->hw.cpld_reg2,
476 cpc_readb(card->hw.falcbase + card->hw.cpld_reg2) &
477 ~(CPLD_REG2_FALC_LED1 << (2 *ch)));
480 CPC_TTY_UNLOCK(card, flags);
485 if (cpc_tty_send_to_card(cpc_tty->pc300dev, (void*)buf, count)) {
487 CPC_TTY_DBG("%s: trasmition error\n", cpc_tty->name);
494 * PC300 TTY Write Room routine
496 * This routine returns the numbers of characteres the tty driver will accept
497 * for queuing to be written.
500 static int cpc_tty_write_room(struct tty_struct *tty)
502 st_cpc_tty_area *cpc_tty;
504 if (!tty || !tty->driver_data ) {
505 CPC_TTY_DBG("hdlcX-tty: no TTY to write room\n");
509 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
511 if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
512 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
516 CPC_TTY_DBG("%s: write room\n",cpc_tty->name);
518 return CPC_TTY_MAX_MTU;
522 * PC300 TTY chars in buffer routine
524 * This routine returns the chars number in the transmission buffer
527 static int cpc_tty_chars_in_buffer(struct tty_struct *tty)
529 st_cpc_tty_area *cpc_tty;
531 if (!tty || !tty->driver_data ) {
532 CPC_TTY_DBG("hdlcX-tty: no TTY to chars in buffer\n");
536 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
538 if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
539 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
546 static int pc300_tiocmset(struct tty_struct *tty, struct file *file,
547 unsigned int set, unsigned int clear)
549 st_cpc_tty_area *cpc_tty;
551 CPC_TTY_DBG("%s: set:%x clear:%x\n", __func__, set, clear);
553 if (!tty || !tty->driver_data ) {
554 CPC_TTY_DBG("hdlcX-tty: no TTY to chars in buffer\n");
558 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
561 cpc_tty_signal_on(cpc_tty->pc300dev, CTL_RTS);
563 cpc_tty_signal_on(cpc_tty->pc300dev, CTL_DTR);
565 if (clear & TIOCM_RTS)
566 cpc_tty_signal_off(cpc_tty->pc300dev, CTL_RTS);
567 if (clear & TIOCM_DTR)
568 cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
573 static int pc300_tiocmget(struct tty_struct *tty)
576 unsigned char status;
578 st_cpc_tty_area *cpc_tty = (st_cpc_tty_area *) tty->driver_data;
579 pc300dev_t *pc300dev = cpc_tty->pc300dev;
580 pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
581 pc300_t *card = (pc300_t *) pc300chan->card;
582 int ch = pc300chan->channel;
584 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
586 CPC_TTY_DBG("%s-tty: tiocmget\n",
587 ((struct net_device*)(pc300dev->hdlc))->name);
589 CPC_TTY_LOCK(card, flags);
590 status = cpc_readb(card->hw.scabase+M_REG(CTL,ch));
591 CPC_TTY_UNLOCK(card,flags);
593 result = ((status & CTL_DTR) ? TIOCM_DTR : 0) |
594 ((status & CTL_RTS) ? TIOCM_RTS : 0);
600 * PC300 TTY Flush Buffer routine
602 * This routine resets the transmission buffer
604 static void cpc_tty_flush_buffer(struct tty_struct *tty)
606 st_cpc_tty_area *cpc_tty;
608 if (!tty || !tty->driver_data ) {
609 CPC_TTY_DBG("hdlcX-tty: no TTY to flush buffer\n");
613 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
615 if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
616 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
620 CPC_TTY_DBG("%s: call wake_up_interruptible\n",cpc_tty->name);
627 * PC300 TTY Hangup routine
629 * This routine is called by the tty driver to hangup the interface
633 static void cpc_tty_hangup(struct tty_struct *tty)
635 st_cpc_tty_area *cpc_tty;
638 if (!tty || !tty->driver_data ) {
639 CPC_TTY_DBG("hdlcX-tty: no TTY to hangup\n");
643 cpc_tty = (st_cpc_tty_area *) tty->driver_data;
645 if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
646 CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
649 if (!serial_drv.refcount && cpc_tty_unreg_flag) {
650 cpc_tty_unreg_flag = 0;
651 CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
652 if ((res=tty_unregister_driver(&serial_drv))) {
653 CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
657 cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
661 * PC300 TTY RX work routine
662 * This routine treats RX work
663 * o verify read buffer
664 * o call the line disc. read
667 static void cpc_tty_rx_work(struct work_struct *work)
669 st_cpc_tty_area *cpc_tty;
672 volatile st_cpc_rx_buf *buf;
673 char flags=0,flg_rx=1;
674 struct tty_ldisc *ld;
676 if (cpc_tty_cnt == 0) return;
678 for (i=0; (i < 4) && flg_rx ; i++) {
681 cpc_tty = container_of(work, st_cpc_tty_area, tty_rx_work);
682 port = cpc_tty - cpc_tty_area;
684 for (j=0; j < CPC_TTY_NPORTS; j++) {
685 cpc_tty = &cpc_tty_area[port];
687 if ((buf=cpc_tty->buf_rx.first) != NULL) {
689 ld = tty_ldisc_ref(cpc_tty->tty);
691 if (ld->ops->receive_buf) {
692 CPC_TTY_DBG("%s: call line disc. receive_buf\n",cpc_tty->name);
693 ld->ops->receive_buf(cpc_tty->tty, (char *)(buf->data), &flags, buf->size);
698 cpc_tty->buf_rx.first = cpc_tty->buf_rx.first->next;
700 buf = cpc_tty->buf_rx.first;
703 if (++port == CPC_TTY_NPORTS) port = 0;
709 * PC300 TTY RX work routine
711 * This routine treats RX interrupt.
712 * o read all frames in card
713 * o verify the frame size
714 * o read the frame in rx buffer
716 static void cpc_tty_rx_disc_frame(pc300ch_t *pc300chan)
718 volatile pcsca_bd_t __iomem * ptdescr;
719 volatile unsigned char status;
720 pc300_t *card = (pc300_t *)pc300chan->card;
721 int ch = pc300chan->channel;
724 ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase +
725 RX_BD_ADDR(ch, pc300chan->rx_first_bd));
726 while (pc300chan->rx_first_bd != pc300chan->rx_last_bd) {
727 status = cpc_readb(&ptdescr->status);
728 cpc_writeb(&ptdescr->status, 0);
729 cpc_writeb(&ptdescr->len, 0);
730 pc300chan->rx_first_bd = (pc300chan->rx_first_bd + 1) &
732 if (status & DST_EOM) {
733 break; /* end of message */
735 ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase + cpc_readl(&ptdescr->next));
739 void cpc_tty_receive(pc300dev_t *pc300dev)
741 st_cpc_tty_area *cpc_tty;
742 pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
743 pc300_t *card = (pc300_t *)pc300chan->card;
744 int ch = pc300chan->channel;
745 volatile pcsca_bd_t __iomem * ptdescr;
746 struct net_device_stats *stats = &pc300dev->dev->stats;
748 volatile unsigned char status;
749 unsigned short first_bd = pc300chan->rx_first_bd;
750 st_cpc_rx_buf *new = NULL;
751 unsigned char dsr_rx;
753 if (pc300dev->cpc_tty == NULL) {
757 dsr_rx = cpc_readb(card->hw.scabase + DSR_RX(ch));
759 cpc_tty = (st_cpc_tty_area *)pc300dev->cpc_tty;
763 ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase + RX_BD_ADDR(ch, first_bd));
764 while ((status = cpc_readb(&ptdescr->status)) & DST_OSB) {
765 rx_len += cpc_readw(&ptdescr->len);
766 first_bd = (first_bd + 1) & (N_DMA_RX_BUF - 1);
767 if (status & DST_EOM) {
770 ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase+cpc_readl(&ptdescr->next));
774 if (dsr_rx & DSR_BOF) {
776 cpc_writel(card->hw.scabase + DRX_REG(EDAL, ch),
777 RX_BD_ADDR(ch, pc300chan->rx_last_bd));
783 if (rx_len > CPC_TTY_MAX_MTU) {
784 /* Free RX descriptors */
785 CPC_TTY_DBG("%s: frame size is invalid.\n",cpc_tty->name);
787 stats->rx_frame_errors++;
788 cpc_tty_rx_disc_frame(pc300chan);
792 new = kmalloc(rx_len + sizeof(st_cpc_rx_buf), GFP_ATOMIC);
794 cpc_tty_rx_disc_frame(pc300chan);
799 ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase +
800 RX_BD_ADDR(ch, pc300chan->rx_first_bd));
802 rx_len = 0; /* counter frame size */
804 while ((status = cpc_readb(&ptdescr->status)) & DST_OSB) {
805 rx_aux = cpc_readw(&ptdescr->len);
806 if ((status & (DST_OVR | DST_CRC | DST_RBIT | DST_SHRT | DST_ABT))
807 || (rx_aux > BD_DEF_LEN)) {
808 CPC_TTY_DBG("%s: reception error\n", cpc_tty->name);
810 if (status & DST_OVR) {
811 stats->rx_fifo_errors++;
813 if (status & DST_CRC) {
814 stats->rx_crc_errors++;
816 if ((status & (DST_RBIT | DST_SHRT | DST_ABT)) ||
817 (rx_aux > BD_DEF_LEN)) {
818 stats->rx_frame_errors++;
820 /* discard remainig descriptors used by the bad frame */
821 CPC_TTY_DBG("%s: reception error - discard descriptors",
823 cpc_tty_rx_disc_frame(pc300chan);
827 break; /* read next frame - while(1) */
830 if (cpc_tty->state != CPC_TTY_ST_OPEN) {
831 /* Free RX descriptors */
832 cpc_tty_rx_disc_frame(pc300chan);
837 break; /* read next frame - while(1) */
840 /* read the segment of the frame */
842 memcpy_fromio((new->data + rx_len),
843 (void __iomem *)(card->hw.rambase +
844 cpc_readl(&ptdescr->ptbuf)), rx_aux);
847 cpc_writeb(&ptdescr->status,0);
848 cpc_writeb(&ptdescr->len, 0);
849 pc300chan->rx_first_bd = (pc300chan->rx_first_bd + 1) &
851 if (status & DST_EOM)break;
853 ptdescr = (pcsca_bd_t __iomem *) (card->hw.rambase +
854 cpc_readl(&ptdescr->next));
857 pc300chan->rx_last_bd = (pc300chan->rx_first_bd - 1) &
859 if (!(dsr_rx & DSR_BOF)) {
861 cpc_writel(card->hw.scabase + DRX_REG(EDAL, ch),
862 RX_BD_ADDR(ch, pc300chan->rx_last_bd));
865 stats->rx_bytes += rx_len;
867 if (pc300dev->trace_on) {
868 cpc_tty_trace(pc300dev, new->data,rx_len, 'R');
872 if (cpc_tty->buf_rx.first == NULL) {
873 cpc_tty->buf_rx.first = new;
874 cpc_tty->buf_rx.last = new;
876 cpc_tty->buf_rx.last->next = new;
877 cpc_tty->buf_rx.last = new;
879 schedule_work(&(cpc_tty->tty_rx_work));
886 * PC300 TTY TX work routine
888 * This routine treats TX interrupt.
889 * o if need call line discipline wakeup
890 * o call wake_up_interruptible
892 static void cpc_tty_tx_work(struct work_struct *work)
894 st_cpc_tty_area *cpc_tty =
895 container_of(work, st_cpc_tty_area, tty_tx_work);
896 struct tty_struct *tty;
898 CPC_TTY_DBG("%s: cpc_tty_tx_work init\n",cpc_tty->name);
900 if ((tty = cpc_tty->tty) == NULL) {
901 CPC_TTY_DBG("%s: the interface is not opened\n",cpc_tty->name);
908 * PC300 TTY send to card routine
910 * This routine send data to card.
911 * o clear descriptors
912 * o write data to DMA buffers
913 * o start the transmission
915 static int cpc_tty_send_to_card(pc300dev_t *dev,void* buf, int len)
917 pc300ch_t *chan = (pc300ch_t *)dev->chan;
918 pc300_t *card = (pc300_t *)chan->card;
919 int ch = chan->channel;
920 struct net_device_stats *stats = &dev->dev->stats;
922 volatile pcsca_bd_t __iomem *ptdescr;
925 int nbuf = ((len - 1)/BD_DEF_LEN) + 1;
926 unsigned char *pdata=buf;
928 CPC_TTY_DBG("%s:cpc_tty_send_to_cars len=%i",
929 (st_cpc_tty_area *)dev->cpc_tty->name,len);
931 if (nbuf >= card->chan[ch].nfree_tx_bd) {
935 /* write buffer to DMA buffers */
936 CPC_TTY_DBG("%s: call dma_buf_write\n",
937 (st_cpc_tty_area *)dev->cpc_tty->name);
938 for (i = 0 ; i < nbuf ; i++) {
939 ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase +
940 TX_BD_ADDR(ch, card->chan[ch].tx_next_bd));
941 nchar = (BD_DEF_LEN > tosend) ? tosend : BD_DEF_LEN;
942 if (cpc_readb(&ptdescr->status) & DST_OSB) {
943 memcpy_toio((void __iomem *)(card->hw.rambase +
944 cpc_readl(&ptdescr->ptbuf)),
945 &pdata[len - tosend],
947 card->chan[ch].nfree_tx_bd--;
948 if ((i + 1) == nbuf) {
949 /* This must be the last BD to be used */
950 cpc_writeb(&ptdescr->status, DST_EOM);
952 cpc_writeb(&ptdescr->status, 0);
954 cpc_writew(&ptdescr->len, nchar);
956 CPC_TTY_DBG("%s: error in dma_buf_write\n",
957 (st_cpc_tty_area *)dev->cpc_tty->name);
962 card->chan[ch].tx_next_bd =
963 (card->chan[ch].tx_next_bd + 1) & (N_DMA_TX_BUF - 1);
967 cpc_tty_trace(dev, buf, len,'T');
970 /* start transmission */
971 CPC_TTY_DBG("%s: start transmission\n",
972 (st_cpc_tty_area *)dev->cpc_tty->name);
974 CPC_TTY_LOCK(card, flags);
975 cpc_writeb(card->hw.scabase + DTX_REG(EDAL, ch),
976 TX_BD_ADDR(ch, chan->tx_next_bd));
977 cpc_writeb(card->hw.scabase + M_REG(CMD, ch), CMD_TX_ENA);
978 cpc_writeb(card->hw.scabase + DSR_TX(ch), DSR_DE);
980 if (card->hw.type == PC300_TE) {
981 cpc_writeb(card->hw.falcbase + card->hw.cpld_reg2,
982 cpc_readb(card->hw.falcbase + card->hw.cpld_reg2) |
983 (CPLD_REG2_FALC_LED1 << (2 * ch)));
985 CPC_TTY_UNLOCK(card, flags);
990 * PC300 TTY trace routine
992 * This routine send trace of connection to application.
993 * o clear descriptors
994 * o write data to DMA buffers
995 * o start the transmission
998 static void cpc_tty_trace(pc300dev_t *dev, char* buf, int len, char rxtx)
1000 struct sk_buff *skb;
1002 if ((skb = dev_alloc_skb(10 + len)) == NULL) {
1004 CPC_TTY_DBG("%s: tty_trace - out of memory\n", dev->dev->name);
1008 skb_put (skb, 10 + len);
1009 skb->dev = dev->dev;
1010 skb->protocol = htons(ETH_P_CUST);
1011 skb_reset_mac_header(skb);
1012 skb->pkt_type = PACKET_HOST;
1013 skb->len = 10 + len;
1015 skb_copy_to_linear_data(skb, dev->dev->name, 5);
1017 skb->data[6] = rxtx;
1021 skb_copy_to_linear_data_offset(skb, 10, buf, len);
1026 * PC300 TTY unregister service routine
1028 * This routine unregister one interface.
1030 void cpc_tty_unregister_service(pc300dev_t *pc300dev)
1032 st_cpc_tty_area *cpc_tty;
1036 if ((cpc_tty= (st_cpc_tty_area *) pc300dev->cpc_tty) == NULL) {
1037 CPC_TTY_DBG("%s: interface is not TTY\n", pc300dev->dev->name);
1040 CPC_TTY_DBG("%s: cpc_tty_unregister_service", cpc_tty->name);
1042 if (cpc_tty->pc300dev != pc300dev) {
1043 CPC_TTY_DBG("%s: invalid tty ptr=%s\n",
1044 pc300dev->dev->name, cpc_tty->name);
1048 if (--cpc_tty_cnt == 0) {
1049 if (serial_drv.refcount) {
1050 CPC_TTY_DBG("%s: unregister is not possible, refcount=%d",
1051 cpc_tty->name, serial_drv.refcount);
1053 cpc_tty_unreg_flag = 1;
1056 CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
1057 if ((res=tty_unregister_driver(&serial_drv))) {
1058 CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
1063 CPC_TTY_LOCK(pc300dev->chan->card,flags);
1064 cpc_tty->tty = NULL;
1065 CPC_TTY_UNLOCK(pc300dev->chan->card, flags);
1066 cpc_tty->tty_minor = 0;
1067 cpc_tty->state = CPC_TTY_ST_IDLE;
1071 * PC300 TTY trigger poll routine
1072 * This routine is called by pc300driver to treats Tx interrupt.
1074 void cpc_tty_trigger_poll(pc300dev_t *pc300dev)
1076 st_cpc_tty_area *cpc_tty = (st_cpc_tty_area *)pc300dev->cpc_tty;
1080 schedule_work(&(cpc_tty->tty_tx_work));
1084 * PC300 TTY reset var routine
1085 * This routine is called by pc300driver to init the TTY area.
1088 void cpc_tty_reset_var(void)
1092 CPC_TTY_DBG("hdlcX-tty: reset variables\n");
1093 /* reset the tty_driver structure - serial_drv */
1094 memset(&serial_drv, 0, sizeof(struct tty_driver));
1095 for (i=0; i < CPC_TTY_NPORTS; i++){
1096 memset(&cpc_tty_area[i],0, sizeof(st_cpc_tty_area));