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[deliverable/linux.git] / drivers / char / riscom8.c
1 /*
2 * linux/drivers/char/riscom.c -- RISCom/8 multiport serial driver.
3 *
4 * Copyright (C) 1994-1996 Dmitry Gorodchanin (pgmdsg@ibi.com)
5 *
6 * This code is loosely based on the Linux serial driver, written by
7 * Linus Torvalds, Theodore T'so and others. The RISCom/8 card
8 * programming info was obtained from various drivers for other OSes
9 * (FreeBSD, ISC, etc), but no source code from those drivers were
10 * directly included in this driver.
11 *
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 *
27 * Revision 1.1
28 *
29 * ChangeLog:
30 * Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 27-Jun-2001
31 * - get rid of check_region and several cleanups
32 */
33
34 #include <linux/module.h>
35
36 #include <linux/io.h>
37 #include <linux/kernel.h>
38 #include <linux/sched.h>
39 #include <linux/ioport.h>
40 #include <linux/interrupt.h>
41 #include <linux/errno.h>
42 #include <linux/tty.h>
43 #include <linux/mm.h>
44 #include <linux/serial.h>
45 #include <linux/fcntl.h>
46 #include <linux/major.h>
47 #include <linux/init.h>
48 #include <linux/delay.h>
49 #include <linux/tty_flip.h>
50 #include <linux/spinlock.h>
51
52 #include <linux/uaccess.h>
53
54 #include "riscom8.h"
55 #include "riscom8_reg.h"
56
57 /* Am I paranoid or not ? ;-) */
58 #define RISCOM_PARANOIA_CHECK
59
60 /*
61 * Crazy InteliCom/8 boards sometimes have swapped CTS & DSR signals.
62 * You can slightly speed up things by #undefing the following option,
63 * if you are REALLY sure that your board is correct one.
64 */
65
66 #define RISCOM_BRAIN_DAMAGED_CTS
67
68 /*
69 * The following defines are mostly for testing purposes. But if you need
70 * some nice reporting in your syslog, you can define them also.
71 */
72 #undef RC_REPORT_FIFO
73 #undef RC_REPORT_OVERRUN
74
75
76 #define RISCOM_LEGAL_FLAGS \
77 (ASYNC_HUP_NOTIFY | ASYNC_SAK | ASYNC_SPLIT_TERMIOS | \
78 ASYNC_SPD_HI | ASYNC_SPEED_VHI | ASYNC_SESSION_LOCKOUT | \
79 ASYNC_PGRP_LOCKOUT | ASYNC_CALLOUT_NOHUP)
80
81 static struct tty_driver *riscom_driver;
82
83 static DEFINE_SPINLOCK(riscom_lock);
84
85 static struct riscom_board rc_board[RC_NBOARD] = {
86 {
87 .base = RC_IOBASE1,
88 },
89 {
90 .base = RC_IOBASE2,
91 },
92 {
93 .base = RC_IOBASE3,
94 },
95 {
96 .base = RC_IOBASE4,
97 },
98 };
99
100 static struct riscom_port rc_port[RC_NBOARD * RC_NPORT];
101
102 /* RISCom/8 I/O ports addresses (without address translation) */
103 static unsigned short rc_ioport[] = {
104 #if 1
105 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0c,
106 #else
107 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0c, 0x10,
108 0x11, 0x12, 0x18, 0x28, 0x31, 0x32, 0x39, 0x3a, 0x40, 0x41, 0x61, 0x62,
109 0x63, 0x64, 0x6b, 0x70, 0x71, 0x78, 0x7a, 0x7b, 0x7f, 0x100, 0x101
110 #endif
111 };
112 #define RC_NIOPORT ARRAY_SIZE(rc_ioport)
113
114
115 static int rc_paranoia_check(struct riscom_port const *port,
116 char *name, const char *routine)
117 {
118 #ifdef RISCOM_PARANOIA_CHECK
119 static const char badmagic[] = KERN_INFO
120 "rc: Warning: bad riscom port magic number for device %s in %s\n";
121 static const char badinfo[] = KERN_INFO
122 "rc: Warning: null riscom port for device %s in %s\n";
123
124 if (!port) {
125 printk(badinfo, name, routine);
126 return 1;
127 }
128 if (port->magic != RISCOM8_MAGIC) {
129 printk(badmagic, name, routine);
130 return 1;
131 }
132 #endif
133 return 0;
134 }
135
136 /*
137 *
138 * Service functions for RISCom/8 driver.
139 *
140 */
141
142 /* Get board number from pointer */
143 static inline int board_No(struct riscom_board const *bp)
144 {
145 return bp - rc_board;
146 }
147
148 /* Get port number from pointer */
149 static inline int port_No(struct riscom_port const *port)
150 {
151 return RC_PORT(port - rc_port);
152 }
153
154 /* Get pointer to board from pointer to port */
155 static inline struct riscom_board *port_Board(struct riscom_port const *port)
156 {
157 return &rc_board[RC_BOARD(port - rc_port)];
158 }
159
160 /* Input Byte from CL CD180 register */
161 static inline unsigned char rc_in(struct riscom_board const *bp,
162 unsigned short reg)
163 {
164 return inb(bp->base + RC_TO_ISA(reg));
165 }
166
167 /* Output Byte to CL CD180 register */
168 static inline void rc_out(struct riscom_board const *bp, unsigned short reg,
169 unsigned char val)
170 {
171 outb(val, bp->base + RC_TO_ISA(reg));
172 }
173
174 /* Wait for Channel Command Register ready */
175 static void rc_wait_CCR(struct riscom_board const *bp)
176 {
177 unsigned long delay;
178
179 /* FIXME: need something more descriptive then 100000 :) */
180 for (delay = 100000; delay; delay--)
181 if (!rc_in(bp, CD180_CCR))
182 return;
183
184 printk(KERN_INFO "rc%d: Timeout waiting for CCR.\n", board_No(bp));
185 }
186
187 /*
188 * RISCom/8 probe functions.
189 */
190
191 static int rc_request_io_range(struct riscom_board * const bp)
192 {
193 int i;
194
195 for (i = 0; i < RC_NIOPORT; i++)
196 if (!request_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1,
197 "RISCom/8")) {
198 goto out_release;
199 }
200 return 0;
201 out_release:
202 printk(KERN_INFO "rc%d: Skipping probe at 0x%03x. IO address in use.\n",
203 board_No(bp), bp->base);
204 while (--i >= 0)
205 release_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1);
206 return 1;
207 }
208
209 static void rc_release_io_range(struct riscom_board * const bp)
210 {
211 int i;
212
213 for (i = 0; i < RC_NIOPORT; i++)
214 release_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1);
215 }
216
217 /* Reset and setup CD180 chip */
218 static void __init rc_init_CD180(struct riscom_board const *bp)
219 {
220 unsigned long flags;
221
222 spin_lock_irqsave(&riscom_lock, flags);
223
224 rc_out(bp, RC_CTOUT, 0); /* Clear timeout */
225 rc_wait_CCR(bp); /* Wait for CCR ready */
226 rc_out(bp, CD180_CCR, CCR_HARDRESET); /* Reset CD180 chip */
227 spin_unlock_irqrestore(&riscom_lock, flags);
228 msleep(50); /* Delay 0.05 sec */
229 spin_lock_irqsave(&riscom_lock, flags);
230 rc_out(bp, CD180_GIVR, RC_ID); /* Set ID for this chip */
231 rc_out(bp, CD180_GICR, 0); /* Clear all bits */
232 rc_out(bp, CD180_PILR1, RC_ACK_MINT); /* Prio for modem intr */
233 rc_out(bp, CD180_PILR2, RC_ACK_TINT); /* Prio for tx intr */
234 rc_out(bp, CD180_PILR3, RC_ACK_RINT); /* Prio for rx intr */
235
236 /* Setting up prescaler. We need 4 ticks per 1 ms */
237 rc_out(bp, CD180_PPRH, (RC_OSCFREQ/(1000000/RISCOM_TPS)) >> 8);
238 rc_out(bp, CD180_PPRL, (RC_OSCFREQ/(1000000/RISCOM_TPS)) & 0xff);
239
240 spin_unlock_irqrestore(&riscom_lock, flags);
241 }
242
243 /* Main probing routine, also sets irq. */
244 static int __init rc_probe(struct riscom_board *bp)
245 {
246 unsigned char val1, val2;
247 int irqs = 0;
248 int retries;
249
250 bp->irq = 0;
251
252 if (rc_request_io_range(bp))
253 return 1;
254
255 /* Are the I/O ports here ? */
256 rc_out(bp, CD180_PPRL, 0x5a);
257 outb(0xff, 0x80);
258 val1 = rc_in(bp, CD180_PPRL);
259 rc_out(bp, CD180_PPRL, 0xa5);
260 outb(0x00, 0x80);
261 val2 = rc_in(bp, CD180_PPRL);
262
263 if ((val1 != 0x5a) || (val2 != 0xa5)) {
264 printk(KERN_ERR "rc%d: RISCom/8 Board at 0x%03x not found.\n",
265 board_No(bp), bp->base);
266 goto out_release;
267 }
268
269 /* It's time to find IRQ for this board */
270 for (retries = 0; retries < 5 && irqs <= 0; retries++) {
271 irqs = probe_irq_on();
272 rc_init_CD180(bp); /* Reset CD180 chip */
273 rc_out(bp, CD180_CAR, 2); /* Select port 2 */
274 rc_wait_CCR(bp);
275 rc_out(bp, CD180_CCR, CCR_TXEN); /* Enable transmitter */
276 rc_out(bp, CD180_IER, IER_TXRDY);/* Enable tx empty intr */
277 msleep(50);
278 irqs = probe_irq_off(irqs);
279 val1 = rc_in(bp, RC_BSR); /* Get Board Status reg */
280 val2 = rc_in(bp, RC_ACK_TINT); /* ACK interrupt */
281 rc_init_CD180(bp); /* Reset CD180 again */
282
283 if ((val1 & RC_BSR_TINT) || (val2 != (RC_ID | GIVR_IT_TX))) {
284 printk(KERN_ERR "rc%d: RISCom/8 Board at 0x%03x not "
285 "found.\n", board_No(bp), bp->base);
286 goto out_release;
287 }
288 }
289
290 if (irqs <= 0) {
291 printk(KERN_ERR "rc%d: Can't find IRQ for RISCom/8 board "
292 "at 0x%03x.\n", board_No(bp), bp->base);
293 goto out_release;
294 }
295 bp->irq = irqs;
296 bp->flags |= RC_BOARD_PRESENT;
297
298 printk(KERN_INFO "rc%d: RISCom/8 Rev. %c board detected at "
299 "0x%03x, IRQ %d.\n",
300 board_No(bp),
301 (rc_in(bp, CD180_GFRCR) & 0x0f) + 'A', /* Board revision */
302 bp->base, bp->irq);
303
304 return 0;
305 out_release:
306 rc_release_io_range(bp);
307 return 1;
308 }
309
310 /*
311 *
312 * Interrupt processing routines.
313 *
314 */
315
316 static struct riscom_port *rc_get_port(struct riscom_board const *bp,
317 unsigned char const *what)
318 {
319 unsigned char channel;
320 struct riscom_port *port;
321
322 channel = rc_in(bp, CD180_GICR) >> GICR_CHAN_OFF;
323 if (channel < CD180_NCH) {
324 port = &rc_port[board_No(bp) * RC_NPORT + channel];
325 if (port->port.flags & ASYNC_INITIALIZED)
326 return port;
327 }
328 printk(KERN_ERR "rc%d: %s interrupt from invalid port %d\n",
329 board_No(bp), what, channel);
330 return NULL;
331 }
332
333 static void rc_receive_exc(struct riscom_board const *bp)
334 {
335 struct riscom_port *port;
336 struct tty_struct *tty;
337 unsigned char status;
338 unsigned char ch, flag;
339
340 port = rc_get_port(bp, "Receive");
341 if (port == NULL)
342 return;
343
344 tty = port->port.tty;
345
346 #ifdef RC_REPORT_OVERRUN
347 status = rc_in(bp, CD180_RCSR);
348 if (status & RCSR_OE)
349 port->overrun++;
350 status &= port->mark_mask;
351 #else
352 status = rc_in(bp, CD180_RCSR) & port->mark_mask;
353 #endif
354 ch = rc_in(bp, CD180_RDR);
355 if (!status)
356 return;
357 if (status & RCSR_TOUT) {
358 printk(KERN_WARNING "rc%d: port %d: Receiver timeout. "
359 "Hardware problems ?\n",
360 board_No(bp), port_No(port));
361 return;
362
363 } else if (status & RCSR_BREAK) {
364 printk(KERN_INFO "rc%d: port %d: Handling break...\n",
365 board_No(bp), port_No(port));
366 flag = TTY_BREAK;
367 if (port->port.flags & ASYNC_SAK)
368 do_SAK(tty);
369
370 } else if (status & RCSR_PE)
371 flag = TTY_PARITY;
372
373 else if (status & RCSR_FE)
374 flag = TTY_FRAME;
375
376 else if (status & RCSR_OE)
377 flag = TTY_OVERRUN;
378 else
379 flag = TTY_NORMAL;
380
381 tty_insert_flip_char(tty, ch, flag);
382 tty_flip_buffer_push(tty);
383 }
384
385 static void rc_receive(struct riscom_board const *bp)
386 {
387 struct riscom_port *port;
388 struct tty_struct *tty;
389 unsigned char count;
390
391 port = rc_get_port(bp, "Receive");
392 if (port == NULL)
393 return;
394
395 tty = port->port.tty;
396
397 count = rc_in(bp, CD180_RDCR);
398
399 #ifdef RC_REPORT_FIFO
400 port->hits[count > 8 ? 9 : count]++;
401 #endif
402
403 while (count--) {
404 if (tty_buffer_request_room(tty, 1) == 0) {
405 printk(KERN_WARNING "rc%d: port %d: Working around "
406 "flip buffer overflow.\n",
407 board_No(bp), port_No(port));
408 break;
409 }
410 tty_insert_flip_char(tty, rc_in(bp, CD180_RDR), TTY_NORMAL);
411 }
412 tty_flip_buffer_push(tty);
413 }
414
415 static void rc_transmit(struct riscom_board const *bp)
416 {
417 struct riscom_port *port;
418 struct tty_struct *tty;
419 unsigned char count;
420
421 port = rc_get_port(bp, "Transmit");
422 if (port == NULL)
423 return;
424
425 tty = port->port.tty;
426
427 if (port->IER & IER_TXEMPTY) {
428 /* FIFO drained */
429 rc_out(bp, CD180_CAR, port_No(port));
430 port->IER &= ~IER_TXEMPTY;
431 rc_out(bp, CD180_IER, port->IER);
432 return;
433 }
434
435 if ((port->xmit_cnt <= 0 && !port->break_length)
436 || tty->stopped || tty->hw_stopped) {
437 rc_out(bp, CD180_CAR, port_No(port));
438 port->IER &= ~IER_TXRDY;
439 rc_out(bp, CD180_IER, port->IER);
440 return;
441 }
442
443 if (port->break_length) {
444 if (port->break_length > 0) {
445 if (port->COR2 & COR2_ETC) {
446 rc_out(bp, CD180_TDR, CD180_C_ESC);
447 rc_out(bp, CD180_TDR, CD180_C_SBRK);
448 port->COR2 &= ~COR2_ETC;
449 }
450 count = min_t(int, port->break_length, 0xff);
451 rc_out(bp, CD180_TDR, CD180_C_ESC);
452 rc_out(bp, CD180_TDR, CD180_C_DELAY);
453 rc_out(bp, CD180_TDR, count);
454 port->break_length -= count;
455 if (port->break_length == 0)
456 port->break_length--;
457 } else {
458 rc_out(bp, CD180_TDR, CD180_C_ESC);
459 rc_out(bp, CD180_TDR, CD180_C_EBRK);
460 rc_out(bp, CD180_COR2, port->COR2);
461 rc_wait_CCR(bp);
462 rc_out(bp, CD180_CCR, CCR_CORCHG2);
463 port->break_length = 0;
464 }
465 return;
466 }
467
468 count = CD180_NFIFO;
469 do {
470 rc_out(bp, CD180_TDR, port->port.xmit_buf[port->xmit_tail++]);
471 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE-1);
472 if (--port->xmit_cnt <= 0)
473 break;
474 } while (--count > 0);
475
476 if (port->xmit_cnt <= 0) {
477 rc_out(bp, CD180_CAR, port_No(port));
478 port->IER &= ~IER_TXRDY;
479 rc_out(bp, CD180_IER, port->IER);
480 }
481 if (port->xmit_cnt <= port->wakeup_chars)
482 tty_wakeup(tty);
483 }
484
485 static void rc_check_modem(struct riscom_board const *bp)
486 {
487 struct riscom_port *port;
488 struct tty_struct *tty;
489 unsigned char mcr;
490
491 port = rc_get_port(bp, "Modem");
492 if (port == NULL)
493 return;
494
495 tty = port->port.tty;
496
497 mcr = rc_in(bp, CD180_MCR);
498 if (mcr & MCR_CDCHG) {
499 if (rc_in(bp, CD180_MSVR) & MSVR_CD)
500 wake_up_interruptible(&port->port.open_wait);
501 else
502 tty_hangup(tty);
503 }
504
505 #ifdef RISCOM_BRAIN_DAMAGED_CTS
506 if (mcr & MCR_CTSCHG) {
507 if (rc_in(bp, CD180_MSVR) & MSVR_CTS) {
508 tty->hw_stopped = 0;
509 port->IER |= IER_TXRDY;
510 if (port->xmit_cnt <= port->wakeup_chars)
511 tty_wakeup(tty);
512 } else {
513 tty->hw_stopped = 1;
514 port->IER &= ~IER_TXRDY;
515 }
516 rc_out(bp, CD180_IER, port->IER);
517 }
518 if (mcr & MCR_DSRCHG) {
519 if (rc_in(bp, CD180_MSVR) & MSVR_DSR) {
520 tty->hw_stopped = 0;
521 port->IER |= IER_TXRDY;
522 if (port->xmit_cnt <= port->wakeup_chars)
523 tty_wakeup(tty);
524 } else {
525 tty->hw_stopped = 1;
526 port->IER &= ~IER_TXRDY;
527 }
528 rc_out(bp, CD180_IER, port->IER);
529 }
530 #endif /* RISCOM_BRAIN_DAMAGED_CTS */
531
532 /* Clear change bits */
533 rc_out(bp, CD180_MCR, 0);
534 }
535
536 /* The main interrupt processing routine */
537 static irqreturn_t rc_interrupt(int dummy, void *dev_id)
538 {
539 unsigned char status;
540 unsigned char ack;
541 struct riscom_board *bp = dev_id;
542 unsigned long loop = 0;
543 int handled = 0;
544
545 if (!(bp->flags & RC_BOARD_ACTIVE))
546 return IRQ_NONE;
547
548 while ((++loop < 16) && ((status = ~(rc_in(bp, RC_BSR))) &
549 (RC_BSR_TOUT | RC_BSR_TINT |
550 RC_BSR_MINT | RC_BSR_RINT))) {
551 handled = 1;
552 if (status & RC_BSR_TOUT)
553 printk(KERN_WARNING "rc%d: Got timeout. Hardware "
554 "error?\n", board_No(bp));
555 else if (status & RC_BSR_RINT) {
556 ack = rc_in(bp, RC_ACK_RINT);
557 if (ack == (RC_ID | GIVR_IT_RCV))
558 rc_receive(bp);
559 else if (ack == (RC_ID | GIVR_IT_REXC))
560 rc_receive_exc(bp);
561 else
562 printk(KERN_WARNING "rc%d: Bad receive ack "
563 "0x%02x.\n",
564 board_No(bp), ack);
565 } else if (status & RC_BSR_TINT) {
566 ack = rc_in(bp, RC_ACK_TINT);
567 if (ack == (RC_ID | GIVR_IT_TX))
568 rc_transmit(bp);
569 else
570 printk(KERN_WARNING "rc%d: Bad transmit ack "
571 "0x%02x.\n",
572 board_No(bp), ack);
573 } else /* if (status & RC_BSR_MINT) */ {
574 ack = rc_in(bp, RC_ACK_MINT);
575 if (ack == (RC_ID | GIVR_IT_MODEM))
576 rc_check_modem(bp);
577 else
578 printk(KERN_WARNING "rc%d: Bad modem ack "
579 "0x%02x.\n",
580 board_No(bp), ack);
581 }
582 rc_out(bp, CD180_EOIR, 0); /* Mark end of interrupt */
583 rc_out(bp, RC_CTOUT, 0); /* Clear timeout flag */
584 }
585 return IRQ_RETVAL(handled);
586 }
587
588 /*
589 * Routines for open & close processing.
590 */
591
592 /* Called with disabled interrupts */
593 static int rc_setup_board(struct riscom_board *bp)
594 {
595 int error;
596
597 if (bp->flags & RC_BOARD_ACTIVE)
598 return 0;
599
600 error = request_irq(bp->irq, rc_interrupt, IRQF_DISABLED,
601 "RISCom/8", bp);
602 if (error)
603 return error;
604
605 rc_out(bp, RC_CTOUT, 0); /* Just in case */
606 bp->DTR = ~0;
607 rc_out(bp, RC_DTR, bp->DTR); /* Drop DTR on all ports */
608
609 bp->flags |= RC_BOARD_ACTIVE;
610
611 return 0;
612 }
613
614 /* Called with disabled interrupts */
615 static void rc_shutdown_board(struct riscom_board *bp)
616 {
617 if (!(bp->flags & RC_BOARD_ACTIVE))
618 return;
619
620 bp->flags &= ~RC_BOARD_ACTIVE;
621
622 free_irq(bp->irq, NULL);
623
624 bp->DTR = ~0;
625 rc_out(bp, RC_DTR, bp->DTR); /* Drop DTR on all ports */
626
627 }
628
629 /*
630 * Setting up port characteristics.
631 * Must be called with disabled interrupts
632 */
633 static void rc_change_speed(struct riscom_board *bp, struct riscom_port *port)
634 {
635 struct tty_struct *tty = port->port.tty;
636 unsigned long baud;
637 long tmp;
638 unsigned char cor1 = 0, cor3 = 0;
639 unsigned char mcor1 = 0, mcor2 = 0;
640
641 port->IER = 0;
642 port->COR2 = 0;
643 port->MSVR = MSVR_RTS;
644
645 baud = tty_get_baud_rate(tty);
646
647 /* Select port on the board */
648 rc_out(bp, CD180_CAR, port_No(port));
649
650 if (!baud) {
651 /* Drop DTR & exit */
652 bp->DTR |= (1u << port_No(port));
653 rc_out(bp, RC_DTR, bp->DTR);
654 return;
655 } else {
656 /* Set DTR on */
657 bp->DTR &= ~(1u << port_No(port));
658 rc_out(bp, RC_DTR, bp->DTR);
659 }
660
661 /*
662 * Now we must calculate some speed depended things
663 */
664
665 /* Set baud rate for port */
666 tmp = (((RC_OSCFREQ + baud/2) / baud +
667 CD180_TPC/2) / CD180_TPC);
668
669 rc_out(bp, CD180_RBPRH, (tmp >> 8) & 0xff);
670 rc_out(bp, CD180_TBPRH, (tmp >> 8) & 0xff);
671 rc_out(bp, CD180_RBPRL, tmp & 0xff);
672 rc_out(bp, CD180_TBPRL, tmp & 0xff);
673
674 baud = (baud + 5) / 10; /* Estimated CPS */
675
676 /* Two timer ticks seems enough to wakeup something like SLIP driver */
677 tmp = ((baud + HZ/2) / HZ) * 2 - CD180_NFIFO;
678 port->wakeup_chars = (tmp < 0) ? 0 : ((tmp >= SERIAL_XMIT_SIZE) ?
679 SERIAL_XMIT_SIZE - 1 : tmp);
680
681 /* Receiver timeout will be transmission time for 1.5 chars */
682 tmp = (RISCOM_TPS + RISCOM_TPS/2 + baud/2) / baud;
683 tmp = (tmp > 0xff) ? 0xff : tmp;
684 rc_out(bp, CD180_RTPR, tmp);
685
686 switch (C_CSIZE(tty)) {
687 case CS5:
688 cor1 |= COR1_5BITS;
689 break;
690 case CS6:
691 cor1 |= COR1_6BITS;
692 break;
693 case CS7:
694 cor1 |= COR1_7BITS;
695 break;
696 case CS8:
697 cor1 |= COR1_8BITS;
698 break;
699 }
700 if (C_CSTOPB(tty))
701 cor1 |= COR1_2SB;
702
703 cor1 |= COR1_IGNORE;
704 if (C_PARENB(tty)) {
705 cor1 |= COR1_NORMPAR;
706 if (C_PARODD(tty))
707 cor1 |= COR1_ODDP;
708 if (I_INPCK(tty))
709 cor1 &= ~COR1_IGNORE;
710 }
711 /* Set marking of some errors */
712 port->mark_mask = RCSR_OE | RCSR_TOUT;
713 if (I_INPCK(tty))
714 port->mark_mask |= RCSR_FE | RCSR_PE;
715 if (I_BRKINT(tty) || I_PARMRK(tty))
716 port->mark_mask |= RCSR_BREAK;
717 if (I_IGNPAR(tty))
718 port->mark_mask &= ~(RCSR_FE | RCSR_PE);
719 if (I_IGNBRK(tty)) {
720 port->mark_mask &= ~RCSR_BREAK;
721 if (I_IGNPAR(tty))
722 /* Real raw mode. Ignore all */
723 port->mark_mask &= ~RCSR_OE;
724 }
725 /* Enable Hardware Flow Control */
726 if (C_CRTSCTS(tty)) {
727 #ifdef RISCOM_BRAIN_DAMAGED_CTS
728 port->IER |= IER_DSR | IER_CTS;
729 mcor1 |= MCOR1_DSRZD | MCOR1_CTSZD;
730 mcor2 |= MCOR2_DSROD | MCOR2_CTSOD;
731 tty->hw_stopped = !(rc_in(bp, CD180_MSVR) &
732 (MSVR_CTS|MSVR_DSR));
733 #else
734 port->COR2 |= COR2_CTSAE;
735 #endif
736 }
737 /* Enable Software Flow Control. FIXME: I'm not sure about this */
738 /* Some people reported that it works, but I still doubt */
739 if (I_IXON(tty)) {
740 port->COR2 |= COR2_TXIBE;
741 cor3 |= (COR3_FCT | COR3_SCDE);
742 if (I_IXANY(tty))
743 port->COR2 |= COR2_IXM;
744 rc_out(bp, CD180_SCHR1, START_CHAR(tty));
745 rc_out(bp, CD180_SCHR2, STOP_CHAR(tty));
746 rc_out(bp, CD180_SCHR3, START_CHAR(tty));
747 rc_out(bp, CD180_SCHR4, STOP_CHAR(tty));
748 }
749 if (!C_CLOCAL(tty)) {
750 /* Enable CD check */
751 port->IER |= IER_CD;
752 mcor1 |= MCOR1_CDZD;
753 mcor2 |= MCOR2_CDOD;
754 }
755
756 if (C_CREAD(tty))
757 /* Enable receiver */
758 port->IER |= IER_RXD;
759
760 /* Set input FIFO size (1-8 bytes) */
761 cor3 |= RISCOM_RXFIFO;
762 /* Setting up CD180 channel registers */
763 rc_out(bp, CD180_COR1, cor1);
764 rc_out(bp, CD180_COR2, port->COR2);
765 rc_out(bp, CD180_COR3, cor3);
766 /* Make CD180 know about registers change */
767 rc_wait_CCR(bp);
768 rc_out(bp, CD180_CCR, CCR_CORCHG1 | CCR_CORCHG2 | CCR_CORCHG3);
769 /* Setting up modem option registers */
770 rc_out(bp, CD180_MCOR1, mcor1);
771 rc_out(bp, CD180_MCOR2, mcor2);
772 /* Enable CD180 transmitter & receiver */
773 rc_wait_CCR(bp);
774 rc_out(bp, CD180_CCR, CCR_TXEN | CCR_RXEN);
775 /* Enable interrupts */
776 rc_out(bp, CD180_IER, port->IER);
777 /* And finally set RTS on */
778 rc_out(bp, CD180_MSVR, port->MSVR);
779 }
780
781 /* Must be called with interrupts enabled */
782 static int rc_setup_port(struct riscom_board *bp, struct riscom_port *port)
783 {
784 unsigned long flags;
785
786 if (port->port.flags & ASYNC_INITIALIZED)
787 return 0;
788
789 if (tty_port_alloc_xmit_buf(&port->port) < 0)
790 return -ENOMEM;
791
792 spin_lock_irqsave(&riscom_lock, flags);
793
794 clear_bit(TTY_IO_ERROR, &port->port.tty->flags);
795 if (port->port.count == 1)
796 bp->count++;
797 port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
798 rc_change_speed(bp, port);
799 port->port.flags |= ASYNC_INITIALIZED;
800
801 spin_unlock_irqrestore(&riscom_lock, flags);
802 return 0;
803 }
804
805 /* Must be called with interrupts disabled */
806 static void rc_shutdown_port(struct tty_struct *tty,
807 struct riscom_board *bp, struct riscom_port *port)
808 {
809 if (!(port->port.flags & ASYNC_INITIALIZED))
810 return;
811
812 #ifdef RC_REPORT_OVERRUN
813 printk(KERN_INFO "rc%d: port %d: Total %ld overruns were detected.\n",
814 board_No(bp), port_No(port), port->overrun);
815 #endif
816 #ifdef RC_REPORT_FIFO
817 {
818 int i;
819
820 printk(KERN_INFO "rc%d: port %d: FIFO hits [ ",
821 board_No(bp), port_No(port));
822 for (i = 0; i < 10; i++)
823 printk("%ld ", port->hits[i]);
824 printk("].\n");
825 }
826 #endif
827 tty_port_free_xmit_buf(&port->port);
828 if (C_HUPCL(tty)) {
829 /* Drop DTR */
830 bp->DTR |= (1u << port_No(port));
831 rc_out(bp, RC_DTR, bp->DTR);
832 }
833
834 /* Select port */
835 rc_out(bp, CD180_CAR, port_No(port));
836 /* Reset port */
837 rc_wait_CCR(bp);
838 rc_out(bp, CD180_CCR, CCR_SOFTRESET);
839 /* Disable all interrupts from this port */
840 port->IER = 0;
841 rc_out(bp, CD180_IER, port->IER);
842
843 set_bit(TTY_IO_ERROR, &tty->flags);
844 port->port.flags &= ~ASYNC_INITIALIZED;
845
846 if (--bp->count < 0) {
847 printk(KERN_INFO "rc%d: rc_shutdown_port: "
848 "bad board count: %d\n",
849 board_No(bp), bp->count);
850 bp->count = 0;
851 }
852 /*
853 * If this is the last opened port on the board
854 * shutdown whole board
855 */
856 if (!bp->count)
857 rc_shutdown_board(bp);
858 }
859
860 static int carrier_raised(struct tty_port *port)
861 {
862 struct riscom_port *p = container_of(port, struct riscom_port, port);
863 struct riscom_board *bp = port_Board(p);
864 unsigned long flags;
865 int CD;
866
867 spin_lock_irqsave(&riscom_lock, flags);
868 rc_out(bp, CD180_CAR, port_No(p));
869 CD = rc_in(bp, CD180_MSVR) & MSVR_CD;
870 rc_out(bp, CD180_MSVR, MSVR_RTS);
871 bp->DTR &= ~(1u << port_No(p));
872 rc_out(bp, RC_DTR, bp->DTR);
873 spin_unlock_irqrestore(&riscom_lock, flags);
874 return CD;
875 }
876
877 static int block_til_ready(struct tty_struct *tty, struct file *filp,
878 struct riscom_port *rp)
879 {
880 DECLARE_WAITQUEUE(wait, current);
881 int retval;
882 int do_clocal = 0;
883 int CD;
884 unsigned long flags;
885 struct tty_port *port = &rp->port;
886
887 /*
888 * If the device is in the middle of being closed, then block
889 * until it's done, and then try again.
890 */
891 if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
892 interruptible_sleep_on(&port->close_wait);
893 if (port->flags & ASYNC_HUP_NOTIFY)
894 return -EAGAIN;
895 else
896 return -ERESTARTSYS;
897 }
898
899 /*
900 * If non-blocking mode is set, or the port is not enabled,
901 * then make the check up front and then exit.
902 */
903 if ((filp->f_flags & O_NONBLOCK) ||
904 (tty->flags & (1 << TTY_IO_ERROR))) {
905 port->flags |= ASYNC_NORMAL_ACTIVE;
906 return 0;
907 }
908
909 if (C_CLOCAL(tty))
910 do_clocal = 1;
911
912 /*
913 * Block waiting for the carrier detect and the line to become
914 * free (i.e., not in use by the callout). While we are in
915 * this loop, info->count is dropped by one, so that
916 * rs_close() knows when to free things. We restore it upon
917 * exit, either normal or abnormal.
918 */
919 retval = 0;
920 add_wait_queue(&port->open_wait, &wait);
921
922 spin_lock_irqsave(&port->lock, flags);
923 if (!tty_hung_up_p(filp))
924 port->count--;
925 port->blocked_open++;
926 spin_unlock_irqrestore(&port->lock, flags);
927
928 while (1) {
929
930 CD = tty_port_carrier_raised(port);
931 set_current_state(TASK_INTERRUPTIBLE);
932 if (tty_hung_up_p(filp) ||
933 !(port->flags & ASYNC_INITIALIZED)) {
934 if (port->flags & ASYNC_HUP_NOTIFY)
935 retval = -EAGAIN;
936 else
937 retval = -ERESTARTSYS;
938 break;
939 }
940 if (!(port->flags & ASYNC_CLOSING) &&
941 (do_clocal || CD))
942 break;
943 if (signal_pending(current)) {
944 retval = -ERESTARTSYS;
945 break;
946 }
947 schedule();
948 }
949 __set_current_state(TASK_RUNNING);
950 remove_wait_queue(&port->open_wait, &wait);
951 spin_lock_irqsave(&port->lock, flags);
952 if (!tty_hung_up_p(filp))
953 port->count++;
954 port->blocked_open--;
955 if (retval == 0)
956 port->flags |= ASYNC_NORMAL_ACTIVE;
957 spin_unlock_irqrestore(&port->lock, flags);
958 return 0;
959 }
960
961 static int rc_open(struct tty_struct *tty, struct file *filp)
962 {
963 int board;
964 int error;
965 struct riscom_port *port;
966 struct riscom_board *bp;
967
968 board = RC_BOARD(tty->index);
969 if (board >= RC_NBOARD || !(rc_board[board].flags & RC_BOARD_PRESENT))
970 return -ENODEV;
971
972 bp = &rc_board[board];
973 port = rc_port + board * RC_NPORT + RC_PORT(tty->index);
974 if (rc_paranoia_check(port, tty->name, "rc_open"))
975 return -ENODEV;
976
977 error = rc_setup_board(bp);
978 if (error)
979 return error;
980
981 port->port.count++;
982 tty->driver_data = port;
983 port->port.tty = tty;
984
985 error = rc_setup_port(bp, port);
986 if (error == 0)
987 error = block_til_ready(tty, filp, port);
988 return error;
989 }
990
991 static void rc_flush_buffer(struct tty_struct *tty)
992 {
993 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
994 unsigned long flags;
995
996 if (rc_paranoia_check(port, tty->name, "rc_flush_buffer"))
997 return;
998
999 spin_lock_irqsave(&riscom_lock, flags);
1000 port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
1001 spin_unlock_irqrestore(&riscom_lock, flags);
1002
1003 tty_wakeup(tty);
1004 }
1005
1006 static void rc_close(struct tty_struct *tty, struct file *filp)
1007 {
1008 struct riscom_port *port = (struct riscom_port *) tty->driver_data;
1009 struct riscom_board *bp;
1010 unsigned long flags;
1011 unsigned long timeout;
1012
1013 if (!port || rc_paranoia_check(port, tty->name, "close"))
1014 return;
1015
1016 spin_lock_irqsave(&port->port.lock, flags);
1017
1018 if (tty_hung_up_p(filp))
1019 goto out;
1020
1021 bp = port_Board(port);
1022 if ((tty->count == 1) && (port->port.count != 1)) {
1023 printk(KERN_INFO "rc%d: rc_close: bad port count;"
1024 " tty->count is 1, port count is %d\n",
1025 board_No(bp), port->port.count);
1026 port->port.count = 1;
1027 }
1028 if (--port->port.count < 0) {
1029 printk(KERN_INFO "rc%d: rc_close: bad port count "
1030 "for tty%d: %d\n",
1031 board_No(bp), port_No(port), port->port.count);
1032 port->port.count = 0;
1033 }
1034 if (port->port.count)
1035 goto out;
1036 port->port.flags |= ASYNC_CLOSING;
1037 /*
1038 * Now we wait for the transmit buffer to clear; and we notify
1039 * the line discipline to only process XON/XOFF characters.
1040 */
1041 tty->closing = 1;
1042 spin_unlock_irqrestore(&port->port.lock, flags);
1043 if (port->port.closing_wait != ASYNC_CLOSING_WAIT_NONE)
1044 tty_wait_until_sent(tty, port->port.closing_wait);
1045 /*
1046 * At this point we stop accepting input. To do this, we
1047 * disable the receive line status interrupts, and tell the
1048 * interrupt driver to stop checking the data ready bit in the
1049 * line status register.
1050 */
1051
1052 spin_lock_irqsave(&riscom_lock, flags);
1053 port->IER &= ~IER_RXD;
1054 if (port->port.flags & ASYNC_INITIALIZED) {
1055 port->IER &= ~IER_TXRDY;
1056 port->IER |= IER_TXEMPTY;
1057 rc_out(bp, CD180_CAR, port_No(port));
1058 rc_out(bp, CD180_IER, port->IER);
1059 /*
1060 * Before we drop DTR, make sure the UART transmitter
1061 * has completely drained; this is especially
1062 * important if there is a transmit FIFO!
1063 */
1064 timeout = jiffies + HZ;
1065 while (port->IER & IER_TXEMPTY) {
1066 spin_unlock_irqrestore(&riscom_lock, flags);
1067 msleep_interruptible(jiffies_to_msecs(port->timeout));
1068 spin_lock_irqsave(&riscom_lock, flags);
1069 if (time_after(jiffies, timeout))
1070 break;
1071 }
1072 }
1073 rc_shutdown_port(tty, bp, port);
1074 rc_flush_buffer(tty);
1075 spin_unlock_irqrestore(&riscom_lock, flags);
1076 tty_ldisc_flush(tty);
1077
1078 spin_lock_irqsave(&port->port.lock, flags);
1079 tty->closing = 0;
1080 port->port.tty = NULL;
1081 if (port->port.blocked_open) {
1082 spin_unlock_irqrestore(&port->port.lock, flags);
1083 if (port->port.close_delay)
1084 msleep_interruptible(jiffies_to_msecs(port->port.close_delay));
1085 wake_up_interruptible(&port->port.open_wait);
1086 spin_lock_irqsave(&port->port.lock, flags);
1087 }
1088 port->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1089 wake_up_interruptible(&port->port.close_wait);
1090
1091 out:
1092 spin_unlock_irqrestore(&riscom_lock, flags);
1093 }
1094
1095 static int rc_write(struct tty_struct *tty,
1096 const unsigned char *buf, int count)
1097 {
1098 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1099 struct riscom_board *bp;
1100 int c, total = 0;
1101 unsigned long flags;
1102
1103 if (rc_paranoia_check(port, tty->name, "rc_write"))
1104 return 0;
1105
1106 bp = port_Board(port);
1107
1108 while (1) {
1109 spin_lock_irqsave(&riscom_lock, flags);
1110
1111 c = min_t(int, count, min(SERIAL_XMIT_SIZE - port->xmit_cnt - 1,
1112 SERIAL_XMIT_SIZE - port->xmit_head));
1113 if (c <= 0)
1114 break; /* lock continues to be held */
1115
1116 memcpy(port->port.xmit_buf + port->xmit_head, buf, c);
1117 port->xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
1118 port->xmit_cnt += c;
1119
1120 spin_unlock_irqrestore(&riscom_lock, flags);
1121
1122 buf += c;
1123 count -= c;
1124 total += c;
1125 }
1126
1127 if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
1128 !(port->IER & IER_TXRDY)) {
1129 port->IER |= IER_TXRDY;
1130 rc_out(bp, CD180_CAR, port_No(port));
1131 rc_out(bp, CD180_IER, port->IER);
1132 }
1133
1134 spin_unlock_irqrestore(&riscom_lock, flags);
1135
1136 return total;
1137 }
1138
1139 static int rc_put_char(struct tty_struct *tty, unsigned char ch)
1140 {
1141 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1142 unsigned long flags;
1143 int ret = 0;
1144
1145 if (rc_paranoia_check(port, tty->name, "rc_put_char"))
1146 return 0;
1147
1148 spin_lock_irqsave(&riscom_lock, flags);
1149
1150 if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1151 goto out;
1152
1153 port->port.xmit_buf[port->xmit_head++] = ch;
1154 port->xmit_head &= SERIAL_XMIT_SIZE - 1;
1155 port->xmit_cnt++;
1156 ret = 1;
1157
1158 out:
1159 spin_unlock_irqrestore(&riscom_lock, flags);
1160 return ret;
1161 }
1162
1163 static void rc_flush_chars(struct tty_struct *tty)
1164 {
1165 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1166 unsigned long flags;
1167
1168 if (rc_paranoia_check(port, tty->name, "rc_flush_chars"))
1169 return;
1170
1171 if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped)
1172 return;
1173
1174 spin_lock_irqsave(&riscom_lock, flags);
1175
1176 port->IER |= IER_TXRDY;
1177 rc_out(port_Board(port), CD180_CAR, port_No(port));
1178 rc_out(port_Board(port), CD180_IER, port->IER);
1179
1180 spin_unlock_irqrestore(&riscom_lock, flags);
1181 }
1182
1183 static int rc_write_room(struct tty_struct *tty)
1184 {
1185 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1186 int ret;
1187
1188 if (rc_paranoia_check(port, tty->name, "rc_write_room"))
1189 return 0;
1190
1191 ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
1192 if (ret < 0)
1193 ret = 0;
1194 return ret;
1195 }
1196
1197 static int rc_chars_in_buffer(struct tty_struct *tty)
1198 {
1199 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1200
1201 if (rc_paranoia_check(port, tty->name, "rc_chars_in_buffer"))
1202 return 0;
1203
1204 return port->xmit_cnt;
1205 }
1206
1207 static int rc_tiocmget(struct tty_struct *tty, struct file *file)
1208 {
1209 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1210 struct riscom_board *bp;
1211 unsigned char status;
1212 unsigned int result;
1213 unsigned long flags;
1214
1215 if (rc_paranoia_check(port, tty->name, __func__))
1216 return -ENODEV;
1217
1218 bp = port_Board(port);
1219
1220 spin_lock_irqsave(&riscom_lock, flags);
1221
1222 rc_out(bp, CD180_CAR, port_No(port));
1223 status = rc_in(bp, CD180_MSVR);
1224 result = rc_in(bp, RC_RI) & (1u << port_No(port)) ? 0 : TIOCM_RNG;
1225
1226 spin_unlock_irqrestore(&riscom_lock, flags);
1227
1228 result |= ((status & MSVR_RTS) ? TIOCM_RTS : 0)
1229 | ((status & MSVR_DTR) ? TIOCM_DTR : 0)
1230 | ((status & MSVR_CD) ? TIOCM_CAR : 0)
1231 | ((status & MSVR_DSR) ? TIOCM_DSR : 0)
1232 | ((status & MSVR_CTS) ? TIOCM_CTS : 0);
1233 return result;
1234 }
1235
1236 static int rc_tiocmset(struct tty_struct *tty, struct file *file,
1237 unsigned int set, unsigned int clear)
1238 {
1239 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1240 unsigned long flags;
1241 struct riscom_board *bp;
1242
1243 if (rc_paranoia_check(port, tty->name, __func__))
1244 return -ENODEV;
1245
1246 bp = port_Board(port);
1247
1248 spin_lock_irqsave(&riscom_lock, flags);
1249
1250 if (set & TIOCM_RTS)
1251 port->MSVR |= MSVR_RTS;
1252 if (set & TIOCM_DTR)
1253 bp->DTR &= ~(1u << port_No(port));
1254
1255 if (clear & TIOCM_RTS)
1256 port->MSVR &= ~MSVR_RTS;
1257 if (clear & TIOCM_DTR)
1258 bp->DTR |= (1u << port_No(port));
1259
1260 rc_out(bp, CD180_CAR, port_No(port));
1261 rc_out(bp, CD180_MSVR, port->MSVR);
1262 rc_out(bp, RC_DTR, bp->DTR);
1263
1264 spin_unlock_irqrestore(&riscom_lock, flags);
1265
1266 return 0;
1267 }
1268
1269 static int rc_send_break(struct tty_struct *tty, int length)
1270 {
1271 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1272 struct riscom_board *bp = port_Board(port);
1273 unsigned long flags;
1274
1275 if (length == 0 || length == -1)
1276 return -EOPNOTSUPP;
1277
1278 spin_lock_irqsave(&riscom_lock, flags);
1279
1280 port->break_length = RISCOM_TPS / HZ * length;
1281 port->COR2 |= COR2_ETC;
1282 port->IER |= IER_TXRDY;
1283 rc_out(bp, CD180_CAR, port_No(port));
1284 rc_out(bp, CD180_COR2, port->COR2);
1285 rc_out(bp, CD180_IER, port->IER);
1286 rc_wait_CCR(bp);
1287 rc_out(bp, CD180_CCR, CCR_CORCHG2);
1288 rc_wait_CCR(bp);
1289
1290 spin_unlock_irqrestore(&riscom_lock, flags);
1291 return 0;
1292 }
1293
1294 static int rc_set_serial_info(struct riscom_port *port,
1295 struct serial_struct __user *newinfo)
1296 {
1297 struct serial_struct tmp;
1298 struct riscom_board *bp = port_Board(port);
1299 int change_speed;
1300
1301 if (copy_from_user(&tmp, newinfo, sizeof(tmp)))
1302 return -EFAULT;
1303
1304 #if 0
1305 if ((tmp.irq != bp->irq) ||
1306 (tmp.port != bp->base) ||
1307 (tmp.type != PORT_CIRRUS) ||
1308 (tmp.baud_base != (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC) ||
1309 (tmp.custom_divisor != 0) ||
1310 (tmp.xmit_fifo_size != CD180_NFIFO) ||
1311 (tmp.flags & ~RISCOM_LEGAL_FLAGS))
1312 return -EINVAL;
1313 #endif
1314
1315 change_speed = ((port->port.flags & ASYNC_SPD_MASK) !=
1316 (tmp.flags & ASYNC_SPD_MASK));
1317
1318 if (!capable(CAP_SYS_ADMIN)) {
1319 if ((tmp.close_delay != port->port.close_delay) ||
1320 (tmp.closing_wait != port->port.closing_wait) ||
1321 ((tmp.flags & ~ASYNC_USR_MASK) !=
1322 (port->port.flags & ~ASYNC_USR_MASK)))
1323 return -EPERM;
1324 port->port.flags = ((port->port.flags & ~ASYNC_USR_MASK) |
1325 (tmp.flags & ASYNC_USR_MASK));
1326 } else {
1327 port->port.flags = ((port->port.flags & ~ASYNC_FLAGS) |
1328 (tmp.flags & ASYNC_FLAGS));
1329 port->port.close_delay = tmp.close_delay;
1330 port->port.closing_wait = tmp.closing_wait;
1331 }
1332 if (change_speed) {
1333 unsigned long flags;
1334
1335 spin_lock_irqsave(&riscom_lock, flags);
1336 rc_change_speed(bp, port);
1337 spin_unlock_irqrestore(&riscom_lock, flags);
1338 }
1339 return 0;
1340 }
1341
1342 static int rc_get_serial_info(struct riscom_port *port,
1343 struct serial_struct __user *retinfo)
1344 {
1345 struct serial_struct tmp;
1346 struct riscom_board *bp = port_Board(port);
1347
1348 memset(&tmp, 0, sizeof(tmp));
1349 tmp.type = PORT_CIRRUS;
1350 tmp.line = port - rc_port;
1351 tmp.port = bp->base;
1352 tmp.irq = bp->irq;
1353 tmp.flags = port->port.flags;
1354 tmp.baud_base = (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC;
1355 tmp.close_delay = port->port.close_delay * HZ/100;
1356 tmp.closing_wait = port->port.closing_wait * HZ/100;
1357 tmp.xmit_fifo_size = CD180_NFIFO;
1358 return copy_to_user(retinfo, &tmp, sizeof(tmp)) ? -EFAULT : 0;
1359 }
1360
1361 static int rc_ioctl(struct tty_struct *tty, struct file *filp,
1362 unsigned int cmd, unsigned long arg)
1363 {
1364 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1365 void __user *argp = (void __user *)arg;
1366 int retval;
1367
1368 if (rc_paranoia_check(port, tty->name, "rc_ioctl"))
1369 return -ENODEV;
1370
1371 switch (cmd) {
1372 case TIOCGSERIAL:
1373 lock_kernel();
1374 retval = rc_get_serial_info(port, argp);
1375 unlock_kernel();
1376 break;
1377 case TIOCSSERIAL:
1378 lock_kernel();
1379 retval = rc_set_serial_info(port, argp);
1380 unlock_kernel();
1381 break;
1382 default:
1383 retval = -ENOIOCTLCMD;
1384 }
1385 return retval;
1386 }
1387
1388 static void rc_throttle(struct tty_struct *tty)
1389 {
1390 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1391 struct riscom_board *bp;
1392 unsigned long flags;
1393
1394 if (rc_paranoia_check(port, tty->name, "rc_throttle"))
1395 return;
1396 bp = port_Board(port);
1397
1398 spin_lock_irqsave(&riscom_lock, flags);
1399 port->MSVR &= ~MSVR_RTS;
1400 rc_out(bp, CD180_CAR, port_No(port));
1401 if (I_IXOFF(tty)) {
1402 rc_wait_CCR(bp);
1403 rc_out(bp, CD180_CCR, CCR_SSCH2);
1404 rc_wait_CCR(bp);
1405 }
1406 rc_out(bp, CD180_MSVR, port->MSVR);
1407 spin_unlock_irqrestore(&riscom_lock, flags);
1408 }
1409
1410 static void rc_unthrottle(struct tty_struct *tty)
1411 {
1412 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1413 struct riscom_board *bp;
1414 unsigned long flags;
1415
1416 if (rc_paranoia_check(port, tty->name, "rc_unthrottle"))
1417 return;
1418 bp = port_Board(port);
1419
1420 spin_lock_irqsave(&riscom_lock, flags);
1421 port->MSVR |= MSVR_RTS;
1422 rc_out(bp, CD180_CAR, port_No(port));
1423 if (I_IXOFF(tty)) {
1424 rc_wait_CCR(bp);
1425 rc_out(bp, CD180_CCR, CCR_SSCH1);
1426 rc_wait_CCR(bp);
1427 }
1428 rc_out(bp, CD180_MSVR, port->MSVR);
1429 spin_unlock_irqrestore(&riscom_lock, flags);
1430 }
1431
1432 static void rc_stop(struct tty_struct *tty)
1433 {
1434 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1435 struct riscom_board *bp;
1436 unsigned long flags;
1437
1438 if (rc_paranoia_check(port, tty->name, "rc_stop"))
1439 return;
1440
1441 bp = port_Board(port);
1442
1443 spin_lock_irqsave(&riscom_lock, flags);
1444 port->IER &= ~IER_TXRDY;
1445 rc_out(bp, CD180_CAR, port_No(port));
1446 rc_out(bp, CD180_IER, port->IER);
1447 spin_unlock_irqrestore(&riscom_lock, flags);
1448 }
1449
1450 static void rc_start(struct tty_struct *tty)
1451 {
1452 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1453 struct riscom_board *bp;
1454 unsigned long flags;
1455
1456 if (rc_paranoia_check(port, tty->name, "rc_start"))
1457 return;
1458
1459 bp = port_Board(port);
1460
1461 spin_lock_irqsave(&riscom_lock, flags);
1462
1463 if (port->xmit_cnt && port->port.xmit_buf && !(port->IER & IER_TXRDY)) {
1464 port->IER |= IER_TXRDY;
1465 rc_out(bp, CD180_CAR, port_No(port));
1466 rc_out(bp, CD180_IER, port->IER);
1467 }
1468 spin_unlock_irqrestore(&riscom_lock, flags);
1469 }
1470
1471 static void rc_hangup(struct tty_struct *tty)
1472 {
1473 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1474 struct riscom_board *bp;
1475 unsigned long flags;
1476
1477 if (rc_paranoia_check(port, tty->name, "rc_hangup"))
1478 return;
1479
1480 bp = port_Board(port);
1481
1482 rc_shutdown_port(tty, bp, port);
1483 spin_lock_irqsave(&port->port.lock, flags);
1484 port->port.count = 0;
1485 port->port.flags &= ~ASYNC_NORMAL_ACTIVE;
1486 port->port.tty = NULL;
1487 wake_up_interruptible(&port->port.open_wait);
1488 spin_unlock_irqrestore(&port->port.lock, flags);
1489 }
1490
1491 static void rc_set_termios(struct tty_struct *tty,
1492 struct ktermios *old_termios)
1493 {
1494 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1495 unsigned long flags;
1496
1497 if (rc_paranoia_check(port, tty->name, "rc_set_termios"))
1498 return;
1499
1500 spin_lock_irqsave(&riscom_lock, flags);
1501 rc_change_speed(port_Board(port), port);
1502 spin_unlock_irqrestore(&riscom_lock, flags);
1503
1504 if ((old_termios->c_cflag & CRTSCTS) &&
1505 !(tty->termios->c_cflag & CRTSCTS)) {
1506 tty->hw_stopped = 0;
1507 rc_start(tty);
1508 }
1509 }
1510
1511 static const struct tty_operations riscom_ops = {
1512 .open = rc_open,
1513 .close = rc_close,
1514 .write = rc_write,
1515 .put_char = rc_put_char,
1516 .flush_chars = rc_flush_chars,
1517 .write_room = rc_write_room,
1518 .chars_in_buffer = rc_chars_in_buffer,
1519 .flush_buffer = rc_flush_buffer,
1520 .ioctl = rc_ioctl,
1521 .throttle = rc_throttle,
1522 .unthrottle = rc_unthrottle,
1523 .set_termios = rc_set_termios,
1524 .stop = rc_stop,
1525 .start = rc_start,
1526 .hangup = rc_hangup,
1527 .tiocmget = rc_tiocmget,
1528 .tiocmset = rc_tiocmset,
1529 .break_ctl = rc_send_break,
1530 };
1531
1532 static const struct tty_port_operations riscom_port_ops = {
1533 .carrier_raised = carrier_raised,
1534 };
1535
1536
1537 static int __init rc_init_drivers(void)
1538 {
1539 int error;
1540 int i;
1541
1542 riscom_driver = alloc_tty_driver(RC_NBOARD * RC_NPORT);
1543 if (!riscom_driver)
1544 return -ENOMEM;
1545
1546 riscom_driver->owner = THIS_MODULE;
1547 riscom_driver->name = "ttyL";
1548 riscom_driver->major = RISCOM8_NORMAL_MAJOR;
1549 riscom_driver->type = TTY_DRIVER_TYPE_SERIAL;
1550 riscom_driver->subtype = SERIAL_TYPE_NORMAL;
1551 riscom_driver->init_termios = tty_std_termios;
1552 riscom_driver->init_termios.c_cflag =
1553 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1554 riscom_driver->init_termios.c_ispeed = 9600;
1555 riscom_driver->init_termios.c_ospeed = 9600;
1556 riscom_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_HARDWARE_BREAK;
1557 tty_set_operations(riscom_driver, &riscom_ops);
1558 error = tty_register_driver(riscom_driver);
1559 if (error != 0) {
1560 put_tty_driver(riscom_driver);
1561 printk(KERN_ERR "rc: Couldn't register RISCom/8 driver, "
1562 "error = %d\n", error);
1563 return 1;
1564 }
1565 memset(rc_port, 0, sizeof(rc_port));
1566 for (i = 0; i < RC_NPORT * RC_NBOARD; i++) {
1567 tty_port_init(&rc_port[i].port);
1568 rc_port[i].port.ops = &riscom_port_ops;
1569 rc_port[i].magic = RISCOM8_MAGIC;
1570 }
1571 return 0;
1572 }
1573
1574 static void rc_release_drivers(void)
1575 {
1576 tty_unregister_driver(riscom_driver);
1577 put_tty_driver(riscom_driver);
1578 }
1579
1580 #ifndef MODULE
1581 /*
1582 * Called at boot time.
1583 *
1584 * You can specify IO base for up to RC_NBOARD cards,
1585 * using line "riscom8=0xiobase1,0xiobase2,.." at LILO prompt.
1586 * Note that there will be no probing at default
1587 * addresses in this case.
1588 *
1589 */
1590 static int __init riscom8_setup(char *str)
1591 {
1592 int ints[RC_NBOARD];
1593 int i;
1594
1595 str = get_options(str, ARRAY_SIZE(ints), ints);
1596
1597 for (i = 0; i < RC_NBOARD; i++) {
1598 if (i < ints[0])
1599 rc_board[i].base = ints[i+1];
1600 else
1601 rc_board[i].base = 0;
1602 }
1603 return 1;
1604 }
1605
1606 __setup("riscom8=", riscom8_setup);
1607 #endif
1608
1609 static char banner[] __initdata =
1610 KERN_INFO "rc: SDL RISCom/8 card driver v1.1, (c) D.Gorodchanin "
1611 "1994-1996.\n";
1612 static char no_boards_msg[] __initdata =
1613 KERN_INFO "rc: No RISCom/8 boards detected.\n";
1614
1615 /*
1616 * This routine must be called by kernel at boot time
1617 */
1618 static int __init riscom8_init(void)
1619 {
1620 int i;
1621 int found = 0;
1622
1623 printk(banner);
1624
1625 if (rc_init_drivers())
1626 return -EIO;
1627
1628 for (i = 0; i < RC_NBOARD; i++)
1629 if (rc_board[i].base && !rc_probe(&rc_board[i]))
1630 found++;
1631 if (!found) {
1632 rc_release_drivers();
1633 printk(no_boards_msg);
1634 return -EIO;
1635 }
1636 return 0;
1637 }
1638
1639 #ifdef MODULE
1640 static int iobase;
1641 static int iobase1;
1642 static int iobase2;
1643 static int iobase3;
1644 module_param(iobase, int, 0);
1645 module_param(iobase1, int, 0);
1646 module_param(iobase2, int, 0);
1647 module_param(iobase3, int, 0);
1648
1649 MODULE_LICENSE("GPL");
1650 #endif /* MODULE */
1651
1652 /*
1653 * You can setup up to 4 boards (current value of RC_NBOARD)
1654 * by specifying "iobase=0xXXX iobase1=0xXXX ..." as insmod parameter.
1655 *
1656 */
1657 static int __init riscom8_init_module(void)
1658 {
1659 #ifdef MODULE
1660 int i;
1661
1662 if (iobase || iobase1 || iobase2 || iobase3) {
1663 for (i = 0; i < RC_NBOARD; i++)
1664 rc_board[i].base = 0;
1665 }
1666
1667 if (iobase)
1668 rc_board[0].base = iobase;
1669 if (iobase1)
1670 rc_board[1].base = iobase1;
1671 if (iobase2)
1672 rc_board[2].base = iobase2;
1673 if (iobase3)
1674 rc_board[3].base = iobase3;
1675 #endif /* MODULE */
1676
1677 return riscom8_init();
1678 }
1679
1680 static void __exit riscom8_exit_module(void)
1681 {
1682 int i;
1683
1684 rc_release_drivers();
1685 for (i = 0; i < RC_NBOARD; i++)
1686 if (rc_board[i].flags & RC_BOARD_PRESENT)
1687 rc_release_io_range(&rc_board[i]);
1688
1689 }
1690
1691 module_init(riscom8_init_module);
1692 module_exit(riscom8_exit_module);
Linux kernel - Deliverables
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