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Merge branch 'for-next' of git://git.o-hand.com/linux-mfd
[mirror_ubuntu-zesty-kernel.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 rc_open(struct tty_struct *tty, struct file *filp)
878 {
879 int board;
880 int error;
881 struct riscom_port *port;
882 struct riscom_board *bp;
883
884 board = RC_BOARD(tty->index);
885 if (board >= RC_NBOARD || !(rc_board[board].flags & RC_BOARD_PRESENT))
886 return -ENODEV;
887
888 bp = &rc_board[board];
889 port = rc_port + board * RC_NPORT + RC_PORT(tty->index);
890 if (rc_paranoia_check(port, tty->name, "rc_open"))
891 return -ENODEV;
892
893 error = rc_setup_board(bp);
894 if (error)
895 return error;
896
897 port->port.count++;
898 tty->driver_data = port;
899 port->port.tty = tty;
900
901 error = rc_setup_port(bp, port);
902 if (error == 0)
903 error = tty_port_block_til_ready(&port->port, tty, filp);
904 return error;
905 }
906
907 static void rc_flush_buffer(struct tty_struct *tty)
908 {
909 struct riscom_port *port = tty->driver_data;
910 unsigned long flags;
911
912 if (rc_paranoia_check(port, tty->name, "rc_flush_buffer"))
913 return;
914
915 spin_lock_irqsave(&riscom_lock, flags);
916 port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
917 spin_unlock_irqrestore(&riscom_lock, flags);
918
919 tty_wakeup(tty);
920 }
921
922 static void rc_close(struct tty_struct *tty, struct file *filp)
923 {
924 struct riscom_port *port = tty->driver_data;
925 struct riscom_board *bp;
926 unsigned long flags;
927 unsigned long timeout;
928
929 if (!port || rc_paranoia_check(port, tty->name, "close"))
930 return;
931
932 bp = port_Board(port);
933
934 if (tty_port_close_start(&port->port, tty, filp) == 0)
935 return;
936
937 /*
938 * At this point we stop accepting input. To do this, we
939 * disable the receive line status interrupts, and tell the
940 * interrupt driver to stop checking the data ready bit in the
941 * line status register.
942 */
943
944 spin_lock_irqsave(&riscom_lock, flags);
945 port->IER &= ~IER_RXD;
946 if (port->port.flags & ASYNC_INITIALIZED) {
947 port->IER &= ~IER_TXRDY;
948 port->IER |= IER_TXEMPTY;
949 rc_out(bp, CD180_CAR, port_No(port));
950 rc_out(bp, CD180_IER, port->IER);
951 /*
952 * Before we drop DTR, make sure the UART transmitter
953 * has completely drained; this is especially
954 * important if there is a transmit FIFO!
955 */
956 timeout = jiffies + HZ;
957 while (port->IER & IER_TXEMPTY) {
958 spin_unlock_irqrestore(&riscom_lock, flags);
959 msleep_interruptible(jiffies_to_msecs(port->timeout));
960 spin_lock_irqsave(&riscom_lock, flags);
961 if (time_after(jiffies, timeout))
962 break;
963 }
964 }
965 rc_shutdown_port(tty, bp, port);
966 rc_flush_buffer(tty);
967 spin_unlock_irqrestore(&riscom_lock, flags);
968
969 tty_port_close_end(&port->port, tty);
970 }
971
972 static int rc_write(struct tty_struct *tty,
973 const unsigned char *buf, int count)
974 {
975 struct riscom_port *port = tty->driver_data;
976 struct riscom_board *bp;
977 int c, total = 0;
978 unsigned long flags;
979
980 if (rc_paranoia_check(port, tty->name, "rc_write"))
981 return 0;
982
983 bp = port_Board(port);
984
985 while (1) {
986 spin_lock_irqsave(&riscom_lock, flags);
987
988 c = min_t(int, count, min(SERIAL_XMIT_SIZE - port->xmit_cnt - 1,
989 SERIAL_XMIT_SIZE - port->xmit_head));
990 if (c <= 0)
991 break; /* lock continues to be held */
992
993 memcpy(port->port.xmit_buf + port->xmit_head, buf, c);
994 port->xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
995 port->xmit_cnt += c;
996
997 spin_unlock_irqrestore(&riscom_lock, flags);
998
999 buf += c;
1000 count -= c;
1001 total += c;
1002 }
1003
1004 if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
1005 !(port->IER & IER_TXRDY)) {
1006 port->IER |= IER_TXRDY;
1007 rc_out(bp, CD180_CAR, port_No(port));
1008 rc_out(bp, CD180_IER, port->IER);
1009 }
1010
1011 spin_unlock_irqrestore(&riscom_lock, flags);
1012
1013 return total;
1014 }
1015
1016 static int rc_put_char(struct tty_struct *tty, unsigned char ch)
1017 {
1018 struct riscom_port *port = tty->driver_data;
1019 unsigned long flags;
1020 int ret = 0;
1021
1022 if (rc_paranoia_check(port, tty->name, "rc_put_char"))
1023 return 0;
1024
1025 spin_lock_irqsave(&riscom_lock, flags);
1026
1027 if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1028 goto out;
1029
1030 port->port.xmit_buf[port->xmit_head++] = ch;
1031 port->xmit_head &= SERIAL_XMIT_SIZE - 1;
1032 port->xmit_cnt++;
1033 ret = 1;
1034
1035 out:
1036 spin_unlock_irqrestore(&riscom_lock, flags);
1037 return ret;
1038 }
1039
1040 static void rc_flush_chars(struct tty_struct *tty)
1041 {
1042 struct riscom_port *port = tty->driver_data;
1043 unsigned long flags;
1044
1045 if (rc_paranoia_check(port, tty->name, "rc_flush_chars"))
1046 return;
1047
1048 if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped)
1049 return;
1050
1051 spin_lock_irqsave(&riscom_lock, flags);
1052
1053 port->IER |= IER_TXRDY;
1054 rc_out(port_Board(port), CD180_CAR, port_No(port));
1055 rc_out(port_Board(port), CD180_IER, port->IER);
1056
1057 spin_unlock_irqrestore(&riscom_lock, flags);
1058 }
1059
1060 static int rc_write_room(struct tty_struct *tty)
1061 {
1062 struct riscom_port *port = tty->driver_data;
1063 int ret;
1064
1065 if (rc_paranoia_check(port, tty->name, "rc_write_room"))
1066 return 0;
1067
1068 ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
1069 if (ret < 0)
1070 ret = 0;
1071 return ret;
1072 }
1073
1074 static int rc_chars_in_buffer(struct tty_struct *tty)
1075 {
1076 struct riscom_port *port = tty->driver_data;
1077
1078 if (rc_paranoia_check(port, tty->name, "rc_chars_in_buffer"))
1079 return 0;
1080
1081 return port->xmit_cnt;
1082 }
1083
1084 static int rc_tiocmget(struct tty_struct *tty, struct file *file)
1085 {
1086 struct riscom_port *port = tty->driver_data;
1087 struct riscom_board *bp;
1088 unsigned char status;
1089 unsigned int result;
1090 unsigned long flags;
1091
1092 if (rc_paranoia_check(port, tty->name, __func__))
1093 return -ENODEV;
1094
1095 bp = port_Board(port);
1096
1097 spin_lock_irqsave(&riscom_lock, flags);
1098
1099 rc_out(bp, CD180_CAR, port_No(port));
1100 status = rc_in(bp, CD180_MSVR);
1101 result = rc_in(bp, RC_RI) & (1u << port_No(port)) ? 0 : TIOCM_RNG;
1102
1103 spin_unlock_irqrestore(&riscom_lock, flags);
1104
1105 result |= ((status & MSVR_RTS) ? TIOCM_RTS : 0)
1106 | ((status & MSVR_DTR) ? TIOCM_DTR : 0)
1107 | ((status & MSVR_CD) ? TIOCM_CAR : 0)
1108 | ((status & MSVR_DSR) ? TIOCM_DSR : 0)
1109 | ((status & MSVR_CTS) ? TIOCM_CTS : 0);
1110 return result;
1111 }
1112
1113 static int rc_tiocmset(struct tty_struct *tty, struct file *file,
1114 unsigned int set, unsigned int clear)
1115 {
1116 struct riscom_port *port = tty->driver_data;
1117 unsigned long flags;
1118 struct riscom_board *bp;
1119
1120 if (rc_paranoia_check(port, tty->name, __func__))
1121 return -ENODEV;
1122
1123 bp = port_Board(port);
1124
1125 spin_lock_irqsave(&riscom_lock, flags);
1126
1127 if (set & TIOCM_RTS)
1128 port->MSVR |= MSVR_RTS;
1129 if (set & TIOCM_DTR)
1130 bp->DTR &= ~(1u << port_No(port));
1131
1132 if (clear & TIOCM_RTS)
1133 port->MSVR &= ~MSVR_RTS;
1134 if (clear & TIOCM_DTR)
1135 bp->DTR |= (1u << port_No(port));
1136
1137 rc_out(bp, CD180_CAR, port_No(port));
1138 rc_out(bp, CD180_MSVR, port->MSVR);
1139 rc_out(bp, RC_DTR, bp->DTR);
1140
1141 spin_unlock_irqrestore(&riscom_lock, flags);
1142
1143 return 0;
1144 }
1145
1146 static int rc_send_break(struct tty_struct *tty, int length)
1147 {
1148 struct riscom_port *port = tty->driver_data;
1149 struct riscom_board *bp = port_Board(port);
1150 unsigned long flags;
1151
1152 if (length == 0 || length == -1)
1153 return -EOPNOTSUPP;
1154
1155 spin_lock_irqsave(&riscom_lock, flags);
1156
1157 port->break_length = RISCOM_TPS / HZ * length;
1158 port->COR2 |= COR2_ETC;
1159 port->IER |= IER_TXRDY;
1160 rc_out(bp, CD180_CAR, port_No(port));
1161 rc_out(bp, CD180_COR2, port->COR2);
1162 rc_out(bp, CD180_IER, port->IER);
1163 rc_wait_CCR(bp);
1164 rc_out(bp, CD180_CCR, CCR_CORCHG2);
1165 rc_wait_CCR(bp);
1166
1167 spin_unlock_irqrestore(&riscom_lock, flags);
1168 return 0;
1169 }
1170
1171 static int rc_set_serial_info(struct riscom_port *port,
1172 struct serial_struct __user *newinfo)
1173 {
1174 struct serial_struct tmp;
1175 struct riscom_board *bp = port_Board(port);
1176 int change_speed;
1177
1178 if (copy_from_user(&tmp, newinfo, sizeof(tmp)))
1179 return -EFAULT;
1180
1181 #if 0
1182 if ((tmp.irq != bp->irq) ||
1183 (tmp.port != bp->base) ||
1184 (tmp.type != PORT_CIRRUS) ||
1185 (tmp.baud_base != (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC) ||
1186 (tmp.custom_divisor != 0) ||
1187 (tmp.xmit_fifo_size != CD180_NFIFO) ||
1188 (tmp.flags & ~RISCOM_LEGAL_FLAGS))
1189 return -EINVAL;
1190 #endif
1191
1192 change_speed = ((port->port.flags & ASYNC_SPD_MASK) !=
1193 (tmp.flags & ASYNC_SPD_MASK));
1194
1195 if (!capable(CAP_SYS_ADMIN)) {
1196 if ((tmp.close_delay != port->port.close_delay) ||
1197 (tmp.closing_wait != port->port.closing_wait) ||
1198 ((tmp.flags & ~ASYNC_USR_MASK) !=
1199 (port->port.flags & ~ASYNC_USR_MASK)))
1200 return -EPERM;
1201 port->port.flags = ((port->port.flags & ~ASYNC_USR_MASK) |
1202 (tmp.flags & ASYNC_USR_MASK));
1203 } else {
1204 port->port.flags = ((port->port.flags & ~ASYNC_FLAGS) |
1205 (tmp.flags & ASYNC_FLAGS));
1206 port->port.close_delay = tmp.close_delay;
1207 port->port.closing_wait = tmp.closing_wait;
1208 }
1209 if (change_speed) {
1210 unsigned long flags;
1211
1212 spin_lock_irqsave(&riscom_lock, flags);
1213 rc_change_speed(bp, port);
1214 spin_unlock_irqrestore(&riscom_lock, flags);
1215 }
1216 return 0;
1217 }
1218
1219 static int rc_get_serial_info(struct riscom_port *port,
1220 struct serial_struct __user *retinfo)
1221 {
1222 struct serial_struct tmp;
1223 struct riscom_board *bp = port_Board(port);
1224
1225 memset(&tmp, 0, sizeof(tmp));
1226 tmp.type = PORT_CIRRUS;
1227 tmp.line = port - rc_port;
1228 tmp.port = bp->base;
1229 tmp.irq = bp->irq;
1230 tmp.flags = port->port.flags;
1231 tmp.baud_base = (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC;
1232 tmp.close_delay = port->port.close_delay * HZ/100;
1233 tmp.closing_wait = port->port.closing_wait * HZ/100;
1234 tmp.xmit_fifo_size = CD180_NFIFO;
1235 return copy_to_user(retinfo, &tmp, sizeof(tmp)) ? -EFAULT : 0;
1236 }
1237
1238 static int rc_ioctl(struct tty_struct *tty, struct file *filp,
1239 unsigned int cmd, unsigned long arg)
1240 {
1241 struct riscom_port *port = tty->driver_data;
1242 void __user *argp = (void __user *)arg;
1243 int retval;
1244
1245 if (rc_paranoia_check(port, tty->name, "rc_ioctl"))
1246 return -ENODEV;
1247
1248 switch (cmd) {
1249 case TIOCGSERIAL:
1250 lock_kernel();
1251 retval = rc_get_serial_info(port, argp);
1252 unlock_kernel();
1253 break;
1254 case TIOCSSERIAL:
1255 lock_kernel();
1256 retval = rc_set_serial_info(port, argp);
1257 unlock_kernel();
1258 break;
1259 default:
1260 retval = -ENOIOCTLCMD;
1261 }
1262 return retval;
1263 }
1264
1265 static void rc_throttle(struct tty_struct *tty)
1266 {
1267 struct riscom_port *port = tty->driver_data;
1268 struct riscom_board *bp;
1269 unsigned long flags;
1270
1271 if (rc_paranoia_check(port, tty->name, "rc_throttle"))
1272 return;
1273 bp = port_Board(port);
1274
1275 spin_lock_irqsave(&riscom_lock, flags);
1276 port->MSVR &= ~MSVR_RTS;
1277 rc_out(bp, CD180_CAR, port_No(port));
1278 if (I_IXOFF(tty)) {
1279 rc_wait_CCR(bp);
1280 rc_out(bp, CD180_CCR, CCR_SSCH2);
1281 rc_wait_CCR(bp);
1282 }
1283 rc_out(bp, CD180_MSVR, port->MSVR);
1284 spin_unlock_irqrestore(&riscom_lock, flags);
1285 }
1286
1287 static void rc_unthrottle(struct tty_struct *tty)
1288 {
1289 struct riscom_port *port = tty->driver_data;
1290 struct riscom_board *bp;
1291 unsigned long flags;
1292
1293 if (rc_paranoia_check(port, tty->name, "rc_unthrottle"))
1294 return;
1295 bp = port_Board(port);
1296
1297 spin_lock_irqsave(&riscom_lock, flags);
1298 port->MSVR |= MSVR_RTS;
1299 rc_out(bp, CD180_CAR, port_No(port));
1300 if (I_IXOFF(tty)) {
1301 rc_wait_CCR(bp);
1302 rc_out(bp, CD180_CCR, CCR_SSCH1);
1303 rc_wait_CCR(bp);
1304 }
1305 rc_out(bp, CD180_MSVR, port->MSVR);
1306 spin_unlock_irqrestore(&riscom_lock, flags);
1307 }
1308
1309 static void rc_stop(struct tty_struct *tty)
1310 {
1311 struct riscom_port *port = tty->driver_data;
1312 struct riscom_board *bp;
1313 unsigned long flags;
1314
1315 if (rc_paranoia_check(port, tty->name, "rc_stop"))
1316 return;
1317
1318 bp = port_Board(port);
1319
1320 spin_lock_irqsave(&riscom_lock, flags);
1321 port->IER &= ~IER_TXRDY;
1322 rc_out(bp, CD180_CAR, port_No(port));
1323 rc_out(bp, CD180_IER, port->IER);
1324 spin_unlock_irqrestore(&riscom_lock, flags);
1325 }
1326
1327 static void rc_start(struct tty_struct *tty)
1328 {
1329 struct riscom_port *port = tty->driver_data;
1330 struct riscom_board *bp;
1331 unsigned long flags;
1332
1333 if (rc_paranoia_check(port, tty->name, "rc_start"))
1334 return;
1335
1336 bp = port_Board(port);
1337
1338 spin_lock_irqsave(&riscom_lock, flags);
1339
1340 if (port->xmit_cnt && port->port.xmit_buf && !(port->IER & IER_TXRDY)) {
1341 port->IER |= IER_TXRDY;
1342 rc_out(bp, CD180_CAR, port_No(port));
1343 rc_out(bp, CD180_IER, port->IER);
1344 }
1345 spin_unlock_irqrestore(&riscom_lock, flags);
1346 }
1347
1348 static void rc_hangup(struct tty_struct *tty)
1349 {
1350 struct riscom_port *port = tty->driver_data;
1351 struct riscom_board *bp;
1352 unsigned long flags;
1353
1354 if (rc_paranoia_check(port, tty->name, "rc_hangup"))
1355 return;
1356
1357 bp = port_Board(port);
1358
1359 rc_shutdown_port(tty, bp, port);
1360 spin_lock_irqsave(&port->port.lock, flags);
1361 port->port.count = 0;
1362 port->port.flags &= ~ASYNC_NORMAL_ACTIVE;
1363 port->port.tty = NULL;
1364 wake_up_interruptible(&port->port.open_wait);
1365 spin_unlock_irqrestore(&port->port.lock, flags);
1366 }
1367
1368 static void rc_set_termios(struct tty_struct *tty,
1369 struct ktermios *old_termios)
1370 {
1371 struct riscom_port *port = tty->driver_data;
1372 unsigned long flags;
1373
1374 if (rc_paranoia_check(port, tty->name, "rc_set_termios"))
1375 return;
1376
1377 spin_lock_irqsave(&riscom_lock, flags);
1378 rc_change_speed(port_Board(port), port);
1379 spin_unlock_irqrestore(&riscom_lock, flags);
1380
1381 if ((old_termios->c_cflag & CRTSCTS) &&
1382 !(tty->termios->c_cflag & CRTSCTS)) {
1383 tty->hw_stopped = 0;
1384 rc_start(tty);
1385 }
1386 }
1387
1388 static const struct tty_operations riscom_ops = {
1389 .open = rc_open,
1390 .close = rc_close,
1391 .write = rc_write,
1392 .put_char = rc_put_char,
1393 .flush_chars = rc_flush_chars,
1394 .write_room = rc_write_room,
1395 .chars_in_buffer = rc_chars_in_buffer,
1396 .flush_buffer = rc_flush_buffer,
1397 .ioctl = rc_ioctl,
1398 .throttle = rc_throttle,
1399 .unthrottle = rc_unthrottle,
1400 .set_termios = rc_set_termios,
1401 .stop = rc_stop,
1402 .start = rc_start,
1403 .hangup = rc_hangup,
1404 .tiocmget = rc_tiocmget,
1405 .tiocmset = rc_tiocmset,
1406 .break_ctl = rc_send_break,
1407 };
1408
1409 static const struct tty_port_operations riscom_port_ops = {
1410 .carrier_raised = carrier_raised,
1411 };
1412
1413
1414 static int __init rc_init_drivers(void)
1415 {
1416 int error;
1417 int i;
1418
1419 riscom_driver = alloc_tty_driver(RC_NBOARD * RC_NPORT);
1420 if (!riscom_driver)
1421 return -ENOMEM;
1422
1423 riscom_driver->owner = THIS_MODULE;
1424 riscom_driver->name = "ttyL";
1425 riscom_driver->major = RISCOM8_NORMAL_MAJOR;
1426 riscom_driver->type = TTY_DRIVER_TYPE_SERIAL;
1427 riscom_driver->subtype = SERIAL_TYPE_NORMAL;
1428 riscom_driver->init_termios = tty_std_termios;
1429 riscom_driver->init_termios.c_cflag =
1430 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1431 riscom_driver->init_termios.c_ispeed = 9600;
1432 riscom_driver->init_termios.c_ospeed = 9600;
1433 riscom_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_HARDWARE_BREAK;
1434 tty_set_operations(riscom_driver, &riscom_ops);
1435 error = tty_register_driver(riscom_driver);
1436 if (error != 0) {
1437 put_tty_driver(riscom_driver);
1438 printk(KERN_ERR "rc: Couldn't register RISCom/8 driver, "
1439 "error = %d\n", error);
1440 return 1;
1441 }
1442 memset(rc_port, 0, sizeof(rc_port));
1443 for (i = 0; i < RC_NPORT * RC_NBOARD; i++) {
1444 tty_port_init(&rc_port[i].port);
1445 rc_port[i].port.ops = &riscom_port_ops;
1446 rc_port[i].magic = RISCOM8_MAGIC;
1447 }
1448 return 0;
1449 }
1450
1451 static void rc_release_drivers(void)
1452 {
1453 tty_unregister_driver(riscom_driver);
1454 put_tty_driver(riscom_driver);
1455 }
1456
1457 #ifndef MODULE
1458 /*
1459 * Called at boot time.
1460 *
1461 * You can specify IO base for up to RC_NBOARD cards,
1462 * using line "riscom8=0xiobase1,0xiobase2,.." at LILO prompt.
1463 * Note that there will be no probing at default
1464 * addresses in this case.
1465 *
1466 */
1467 static int __init riscom8_setup(char *str)
1468 {
1469 int ints[RC_NBOARD];
1470 int i;
1471
1472 str = get_options(str, ARRAY_SIZE(ints), ints);
1473
1474 for (i = 0; i < RC_NBOARD; i++) {
1475 if (i < ints[0])
1476 rc_board[i].base = ints[i+1];
1477 else
1478 rc_board[i].base = 0;
1479 }
1480 return 1;
1481 }
1482
1483 __setup("riscom8=", riscom8_setup);
1484 #endif
1485
1486 static char banner[] __initdata =
1487 KERN_INFO "rc: SDL RISCom/8 card driver v1.1, (c) D.Gorodchanin "
1488 "1994-1996.\n";
1489 static char no_boards_msg[] __initdata =
1490 KERN_INFO "rc: No RISCom/8 boards detected.\n";
1491
1492 /*
1493 * This routine must be called by kernel at boot time
1494 */
1495 static int __init riscom8_init(void)
1496 {
1497 int i;
1498 int found = 0;
1499
1500 printk(banner);
1501
1502 if (rc_init_drivers())
1503 return -EIO;
1504
1505 for (i = 0; i < RC_NBOARD; i++)
1506 if (rc_board[i].base && !rc_probe(&rc_board[i]))
1507 found++;
1508 if (!found) {
1509 rc_release_drivers();
1510 printk(no_boards_msg);
1511 return -EIO;
1512 }
1513 return 0;
1514 }
1515
1516 #ifdef MODULE
1517 static int iobase;
1518 static int iobase1;
1519 static int iobase2;
1520 static int iobase3;
1521 module_param(iobase, int, 0);
1522 module_param(iobase1, int, 0);
1523 module_param(iobase2, int, 0);
1524 module_param(iobase3, int, 0);
1525
1526 MODULE_LICENSE("GPL");
1527 #endif /* MODULE */
1528
1529 /*
1530 * You can setup up to 4 boards (current value of RC_NBOARD)
1531 * by specifying "iobase=0xXXX iobase1=0xXXX ..." as insmod parameter.
1532 *
1533 */
1534 static int __init riscom8_init_module(void)
1535 {
1536 #ifdef MODULE
1537 int i;
1538
1539 if (iobase || iobase1 || iobase2 || iobase3) {
1540 for (i = 0; i < RC_NBOARD; i++)
1541 rc_board[i].base = 0;
1542 }
1543
1544 if (iobase)
1545 rc_board[0].base = iobase;
1546 if (iobase1)
1547 rc_board[1].base = iobase1;
1548 if (iobase2)
1549 rc_board[2].base = iobase2;
1550 if (iobase3)
1551 rc_board[3].base = iobase3;
1552 #endif /* MODULE */
1553
1554 return riscom8_init();
1555 }
1556
1557 static void __exit riscom8_exit_module(void)
1558 {
1559 int i;
1560
1561 rc_release_drivers();
1562 for (i = 0; i < RC_NBOARD; i++)
1563 if (rc_board[i].flags & RC_BOARD_PRESENT)
1564 rc_release_io_range(&rc_board[i]);
1565
1566 }
1567
1568 module_init(riscom8_init_module);
1569 module_exit(riscom8_exit_module);
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