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omap: i2c: add a timeout to the busy waiting
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / char / riscom8.c
blobb02332a5412f781c2631046cb32e12866be64c47
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/smp_lock.h>
51 #include <linux/spinlock.h>
52 #include <linux/device.h>
53
54 #include <linux/uaccess.h>
55
56 #include "riscom8.h"
57 #include "riscom8_reg.h"
58
59 /* Am I paranoid or not ? ;-) */
60 #define RISCOM_PARANOIA_CHECK
61
62 /*
63 * Crazy InteliCom/8 boards sometimes have swapped CTS & DSR signals.
64 * You can slightly speed up things by #undefing the following option,
65 * if you are REALLY sure that your board is correct one.
66 */
67
68 #define RISCOM_BRAIN_DAMAGED_CTS
69
70 /*
71 * The following defines are mostly for testing purposes. But if you need
72 * some nice reporting in your syslog, you can define them also.
73 */
74 #undef RC_REPORT_FIFO
75 #undef RC_REPORT_OVERRUN
76
77
78 #define RISCOM_LEGAL_FLAGS \
79 (ASYNC_HUP_NOTIFY | ASYNC_SAK | ASYNC_SPLIT_TERMIOS | \
80 ASYNC_SPD_HI | ASYNC_SPEED_VHI | ASYNC_SESSION_LOCKOUT | \
81 ASYNC_PGRP_LOCKOUT | ASYNC_CALLOUT_NOHUP)
82
83 static struct tty_driver *riscom_driver;
84
85 static DEFINE_SPINLOCK(riscom_lock);
86
87 static struct riscom_board rc_board[RC_NBOARD] = {
88 {
89 .base = RC_IOBASE1,
90 },
91 {
92 .base = RC_IOBASE2,
93 },
94 {
95 .base = RC_IOBASE3,
96 },
97 {
98 .base = RC_IOBASE4,
99 },
100 };
101
102 static struct riscom_port rc_port[RC_NBOARD * RC_NPORT];
103
104 /* RISCom/8 I/O ports addresses (without address translation) */
105 static unsigned short rc_ioport[] = {
106 #if 1
107 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0c,
108 #else
109 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0c, 0x10,
110 0x11, 0x12, 0x18, 0x28, 0x31, 0x32, 0x39, 0x3a, 0x40, 0x41, 0x61, 0x62,
111 0x63, 0x64, 0x6b, 0x70, 0x71, 0x78, 0x7a, 0x7b, 0x7f, 0x100, 0x101
112 #endif
113 };
114 #define RC_NIOPORT ARRAY_SIZE(rc_ioport)
115
116
117 static int rc_paranoia_check(struct riscom_port const *port,
118 char *name, const char *routine)
119 {
120 #ifdef RISCOM_PARANOIA_CHECK
121 static const char badmagic[] = KERN_INFO
122 "rc: Warning: bad riscom port magic number for device %s in %s\n";
123 static const char badinfo[] = KERN_INFO
124 "rc: Warning: null riscom port for device %s in %s\n";
125
126 if (!port) {
127 printk(badinfo, name, routine);
128 return 1;
129 }
130 if (port->magic != RISCOM8_MAGIC) {
131 printk(badmagic, name, routine);
132 return 1;
133 }
134 #endif
135 return 0;
136 }
137
138 /*
139 *
140 * Service functions for RISCom/8 driver.
141 *
142 */
143
144 /* Get board number from pointer */
145 static inline int board_No(struct riscom_board const *bp)
146 {
147 return bp - rc_board;
148 }
149
150 /* Get port number from pointer */
151 static inline int port_No(struct riscom_port const *port)
152 {
153 return RC_PORT(port - rc_port);
154 }
155
156 /* Get pointer to board from pointer to port */
157 static inline struct riscom_board *port_Board(struct riscom_port const *port)
158 {
159 return &rc_board[RC_BOARD(port - rc_port)];
160 }
161
162 /* Input Byte from CL CD180 register */
163 static inline unsigned char rc_in(struct riscom_board const *bp,
164 unsigned short reg)
165 {
166 return inb(bp->base + RC_TO_ISA(reg));
167 }
168
169 /* Output Byte to CL CD180 register */
170 static inline void rc_out(struct riscom_board const *bp, unsigned short reg,
171 unsigned char val)
172 {
173 outb(val, bp->base + RC_TO_ISA(reg));
174 }
175
176 /* Wait for Channel Command Register ready */
177 static void rc_wait_CCR(struct riscom_board const *bp)
178 {
179 unsigned long delay;
180
181 /* FIXME: need something more descriptive then 100000 :) */
182 for (delay = 100000; delay; delay--)
183 if (!rc_in(bp, CD180_CCR))
184 return;
185
186 printk(KERN_INFO "rc%d: Timeout waiting for CCR.\n", board_No(bp));
187 }
188
189 /*
190 * RISCom/8 probe functions.
191 */
192
193 static int rc_request_io_range(struct riscom_board * const bp)
194 {
195 int i;
196
197 for (i = 0; i < RC_NIOPORT; i++)
198 if (!request_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1,
199 "RISCom/8")) {
200 goto out_release;
201 }
202 return 0;
203 out_release:
204 printk(KERN_INFO "rc%d: Skipping probe at 0x%03x. IO address in use.\n",
205 board_No(bp), bp->base);
206 while (--i >= 0)
207 release_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1);
208 return 1;
209 }
210
211 static void rc_release_io_range(struct riscom_board * const bp)
212 {
213 int i;
214
215 for (i = 0; i < RC_NIOPORT; i++)
216 release_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1);
217 }
218
219 /* Reset and setup CD180 chip */
220 static void __init rc_init_CD180(struct riscom_board const *bp)
221 {
222 unsigned long flags;
223
224 spin_lock_irqsave(&riscom_lock, flags);
225
226 rc_out(bp, RC_CTOUT, 0); /* Clear timeout */
227 rc_wait_CCR(bp); /* Wait for CCR ready */
228 rc_out(bp, CD180_CCR, CCR_HARDRESET); /* Reset CD180 chip */
229 spin_unlock_irqrestore(&riscom_lock, flags);
230 msleep(50); /* Delay 0.05 sec */
231 spin_lock_irqsave(&riscom_lock, flags);
232 rc_out(bp, CD180_GIVR, RC_ID); /* Set ID for this chip */
233 rc_out(bp, CD180_GICR, 0); /* Clear all bits */
234 rc_out(bp, CD180_PILR1, RC_ACK_MINT); /* Prio for modem intr */
235 rc_out(bp, CD180_PILR2, RC_ACK_TINT); /* Prio for tx intr */
236 rc_out(bp, CD180_PILR3, RC_ACK_RINT); /* Prio for rx intr */
237
238 /* Setting up prescaler. We need 4 ticks per 1 ms */
239 rc_out(bp, CD180_PPRH, (RC_OSCFREQ/(1000000/RISCOM_TPS)) >> 8);
240 rc_out(bp, CD180_PPRL, (RC_OSCFREQ/(1000000/RISCOM_TPS)) & 0xff);
241
242 spin_unlock_irqrestore(&riscom_lock, flags);
243 }
244
245 /* Main probing routine, also sets irq. */
246 static int __init rc_probe(struct riscom_board *bp)
247 {
248 unsigned char val1, val2;
249 int irqs = 0;
250 int retries;
251
252 bp->irq = 0;
253
254 if (rc_request_io_range(bp))
255 return 1;
256
257 /* Are the I/O ports here ? */
258 rc_out(bp, CD180_PPRL, 0x5a);
259 outb(0xff, 0x80);
260 val1 = rc_in(bp, CD180_PPRL);
261 rc_out(bp, CD180_PPRL, 0xa5);
262 outb(0x00, 0x80);
263 val2 = rc_in(bp, CD180_PPRL);
264
265 if ((val1 != 0x5a) || (val2 != 0xa5)) {
266 printk(KERN_ERR "rc%d: RISCom/8 Board at 0x%03x not found.\n",
267 board_No(bp), bp->base);
268 goto out_release;
269 }
270
271 /* It's time to find IRQ for this board */
272 for (retries = 0; retries < 5 && irqs <= 0; retries++) {
273 irqs = probe_irq_on();
274 rc_init_CD180(bp); /* Reset CD180 chip */
275 rc_out(bp, CD180_CAR, 2); /* Select port 2 */
276 rc_wait_CCR(bp);
277 rc_out(bp, CD180_CCR, CCR_TXEN); /* Enable transmitter */
278 rc_out(bp, CD180_IER, IER_TXRDY);/* Enable tx empty intr */
279 msleep(50);
280 irqs = probe_irq_off(irqs);
281 val1 = rc_in(bp, RC_BSR); /* Get Board Status reg */
282 val2 = rc_in(bp, RC_ACK_TINT); /* ACK interrupt */
283 rc_init_CD180(bp); /* Reset CD180 again */
284
285 if ((val1 & RC_BSR_TINT) || (val2 != (RC_ID | GIVR_IT_TX))) {
286 printk(KERN_ERR "rc%d: RISCom/8 Board at 0x%03x not "
287 "found.\n", board_No(bp), bp->base);
288 goto out_release;
289 }
290 }
291
292 if (irqs <= 0) {
293 printk(KERN_ERR "rc%d: Can't find IRQ for RISCom/8 board "
294 "at 0x%03x.\n", board_No(bp), bp->base);
295 goto out_release;
296 }
297 bp->irq = irqs;
298 bp->flags |= RC_BOARD_PRESENT;
299
300 printk(KERN_INFO "rc%d: RISCom/8 Rev. %c board detected at "
301 "0x%03x, IRQ %d.\n",
302 board_No(bp),
303 (rc_in(bp, CD180_GFRCR) & 0x0f) + 'A', /* Board revision */
304 bp->base, bp->irq);
305
306 return 0;
307 out_release:
308 rc_release_io_range(bp);
309 return 1;
310 }
311
312 /*
313 *
314 * Interrupt processing routines.
315 *
316 */
317
318 static struct riscom_port *rc_get_port(struct riscom_board const *bp,
319 unsigned char const *what)
320 {
321 unsigned char channel;
322 struct riscom_port *port;
323
324 channel = rc_in(bp, CD180_GICR) >> GICR_CHAN_OFF;
325 if (channel < CD180_NCH) {
326 port = &rc_port[board_No(bp) * RC_NPORT + channel];
327 if (port->port.flags & ASYNC_INITIALIZED)
328 return port;
329 }
330 printk(KERN_ERR "rc%d: %s interrupt from invalid port %d\n",
331 board_No(bp), what, channel);
332 return NULL;
333 }
334
335 static void rc_receive_exc(struct riscom_board const *bp)
336 {
337 struct riscom_port *port;
338 struct tty_struct *tty;
339 unsigned char status;
340 unsigned char ch, flag;
341
342 port = rc_get_port(bp, "Receive");
343 if (port == NULL)
344 return;
345
346 tty = tty_port_tty_get(&port->port);
347
348 #ifdef RC_REPORT_OVERRUN
349 status = rc_in(bp, CD180_RCSR);
350 if (status & RCSR_OE)
351 port->overrun++;
352 status &= port->mark_mask;
353 #else
354 status = rc_in(bp, CD180_RCSR) & port->mark_mask;
355 #endif
356 ch = rc_in(bp, CD180_RDR);
357 if (!status)
358 goto out;
359 if (status & RCSR_TOUT) {
360 printk(KERN_WARNING "rc%d: port %d: Receiver timeout. "
361 "Hardware problems ?\n",
362 board_No(bp), port_No(port));
363 goto out;
364
365 } else if (status & RCSR_BREAK) {
366 printk(KERN_INFO "rc%d: port %d: Handling break...\n",
367 board_No(bp), port_No(port));
368 flag = TTY_BREAK;
369 if (tty && (port->port.flags & ASYNC_SAK))
370 do_SAK(tty);
371
372 } else if (status & RCSR_PE)
373 flag = TTY_PARITY;
374
375 else if (status & RCSR_FE)
376 flag = TTY_FRAME;
377
378 else if (status & RCSR_OE)
379 flag = TTY_OVERRUN;
380 else
381 flag = TTY_NORMAL;
382
383 if (tty) {
384 tty_insert_flip_char(tty, ch, flag);
385 tty_flip_buffer_push(tty);
386 }
387 out:
388 tty_kref_put(tty);
389 }
390
391 static void rc_receive(struct riscom_board const *bp)
392 {
393 struct riscom_port *port;
394 struct tty_struct *tty;
395 unsigned char count;
396
397 port = rc_get_port(bp, "Receive");
398 if (port == NULL)
399 return;
400
401 tty = tty_port_tty_get(&port->port);
402
403 count = rc_in(bp, CD180_RDCR);
404
405 #ifdef RC_REPORT_FIFO
406 port->hits[count > 8 ? 9 : count]++;
407 #endif
408
409 while (count--) {
410 u8 ch = rc_in(bp, CD180_RDR);
411 if (tty)
412 tty_insert_flip_char(tty, ch, TTY_NORMAL);
413 }
414 if (tty) {
415 tty_flip_buffer_push(tty);
416 tty_kref_put(tty);
417 }
418 }
419
420 static void rc_transmit(struct riscom_board const *bp)
421 {
422 struct riscom_port *port;
423 struct tty_struct *tty;
424 unsigned char count;
425
426 port = rc_get_port(bp, "Transmit");
427 if (port == NULL)
428 return;
429
430 tty = tty_port_tty_get(&port->port);
431
432 if (port->IER & IER_TXEMPTY) {
433 /* FIFO drained */
434 rc_out(bp, CD180_CAR, port_No(port));
435 port->IER &= ~IER_TXEMPTY;
436 rc_out(bp, CD180_IER, port->IER);
437 goto out;
438 }
439
440 if ((port->xmit_cnt <= 0 && !port->break_length)
441 || (tty && (tty->stopped || tty->hw_stopped))) {
442 rc_out(bp, CD180_CAR, port_No(port));
443 port->IER &= ~IER_TXRDY;
444 rc_out(bp, CD180_IER, port->IER);
445 goto out;
446 }
447
448 if (port->break_length) {
449 if (port->break_length > 0) {
450 if (port->COR2 & COR2_ETC) {
451 rc_out(bp, CD180_TDR, CD180_C_ESC);
452 rc_out(bp, CD180_TDR, CD180_C_SBRK);
453 port->COR2 &= ~COR2_ETC;
454 }
455 count = min_t(int, port->break_length, 0xff);
456 rc_out(bp, CD180_TDR, CD180_C_ESC);
457 rc_out(bp, CD180_TDR, CD180_C_DELAY);
458 rc_out(bp, CD180_TDR, count);
459 port->break_length -= count;
460 if (port->break_length == 0)
461 port->break_length--;
462 } else {
463 rc_out(bp, CD180_TDR, CD180_C_ESC);
464 rc_out(bp, CD180_TDR, CD180_C_EBRK);
465 rc_out(bp, CD180_COR2, port->COR2);
466 rc_wait_CCR(bp);
467 rc_out(bp, CD180_CCR, CCR_CORCHG2);
468 port->break_length = 0;
469 }
470 goto out;
471 }
472
473 count = CD180_NFIFO;
474 do {
475 rc_out(bp, CD180_TDR, port->port.xmit_buf[port->xmit_tail++]);
476 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE-1);
477 if (--port->xmit_cnt <= 0)
478 break;
479 } while (--count > 0);
480
481 if (port->xmit_cnt <= 0) {
482 rc_out(bp, CD180_CAR, port_No(port));
483 port->IER &= ~IER_TXRDY;
484 rc_out(bp, CD180_IER, port->IER);
485 }
486 if (tty && port->xmit_cnt <= port->wakeup_chars)
487 tty_wakeup(tty);
488 out:
489 tty_kref_put(tty);
490 }
491
492 static void rc_check_modem(struct riscom_board const *bp)
493 {
494 struct riscom_port *port;
495 struct tty_struct *tty;
496 unsigned char mcr;
497
498 port = rc_get_port(bp, "Modem");
499 if (port == NULL)
500 return;
501
502 tty = tty_port_tty_get(&port->port);
503
504 mcr = rc_in(bp, CD180_MCR);
505 if (mcr & MCR_CDCHG) {
506 if (rc_in(bp, CD180_MSVR) & MSVR_CD)
507 wake_up_interruptible(&port->port.open_wait);
508 else if (tty)
509 tty_hangup(tty);
510 }
511
512 #ifdef RISCOM_BRAIN_DAMAGED_CTS
513 if (mcr & MCR_CTSCHG) {
514 if (rc_in(bp, CD180_MSVR) & MSVR_CTS) {
515 port->IER |= IER_TXRDY;
516 if (tty) {
517 tty->hw_stopped = 0;
518 if (port->xmit_cnt <= port->wakeup_chars)
519 tty_wakeup(tty);
520 }
521 } else {
522 if (tty)
523 tty->hw_stopped = 1;
524 port->IER &= ~IER_TXRDY;
525 }
526 rc_out(bp, CD180_IER, port->IER);
527 }
528 if (mcr & MCR_DSRCHG) {
529 if (rc_in(bp, CD180_MSVR) & MSVR_DSR) {
530 port->IER |= IER_TXRDY;
531 if (tty) {
532 tty->hw_stopped = 0;
533 if (port->xmit_cnt <= port->wakeup_chars)
534 tty_wakeup(tty);
535 }
536 } else {
537 if (tty)
538 tty->hw_stopped = 1;
539 port->IER &= ~IER_TXRDY;
540 }
541 rc_out(bp, CD180_IER, port->IER);
542 }
543 #endif /* RISCOM_BRAIN_DAMAGED_CTS */
544
545 /* Clear change bits */
546 rc_out(bp, CD180_MCR, 0);
547 tty_kref_put(tty);
548 }
549
550 /* The main interrupt processing routine */
551 static irqreturn_t rc_interrupt(int dummy, void *dev_id)
552 {
553 unsigned char status;
554 unsigned char ack;
555 struct riscom_board *bp = dev_id;
556 unsigned long loop = 0;
557 int handled = 0;
558
559 if (!(bp->flags & RC_BOARD_ACTIVE))
560 return IRQ_NONE;
561
562 while ((++loop < 16) && ((status = ~(rc_in(bp, RC_BSR))) &
563 (RC_BSR_TOUT | RC_BSR_TINT |
564 RC_BSR_MINT | RC_BSR_RINT))) {
565 handled = 1;
566 if (status & RC_BSR_TOUT)
567 printk(KERN_WARNING "rc%d: Got timeout. Hardware "
568 "error?\n", board_No(bp));
569 else if (status & RC_BSR_RINT) {
570 ack = rc_in(bp, RC_ACK_RINT);
571 if (ack == (RC_ID | GIVR_IT_RCV))
572 rc_receive(bp);
573 else if (ack == (RC_ID | GIVR_IT_REXC))
574 rc_receive_exc(bp);
575 else
576 printk(KERN_WARNING "rc%d: Bad receive ack "
577 "0x%02x.\n",
578 board_No(bp), ack);
579 } else if (status & RC_BSR_TINT) {
580 ack = rc_in(bp, RC_ACK_TINT);
581 if (ack == (RC_ID | GIVR_IT_TX))
582 rc_transmit(bp);
583 else
584 printk(KERN_WARNING "rc%d: Bad transmit ack "
585 "0x%02x.\n",
586 board_No(bp), ack);
587 } else /* if (status & RC_BSR_MINT) */ {
588 ack = rc_in(bp, RC_ACK_MINT);
589 if (ack == (RC_ID | GIVR_IT_MODEM))
590 rc_check_modem(bp);
591 else
592 printk(KERN_WARNING "rc%d: Bad modem ack "
593 "0x%02x.\n",
594 board_No(bp), ack);
595 }
596 rc_out(bp, CD180_EOIR, 0); /* Mark end of interrupt */
597 rc_out(bp, RC_CTOUT, 0); /* Clear timeout flag */
598 }
599 return IRQ_RETVAL(handled);
600 }
601
602 /*
603 * Routines for open & close processing.
604 */
605
606 /* Called with disabled interrupts */
607 static int rc_setup_board(struct riscom_board *bp)
608 {
609 int error;
610
611 if (bp->flags & RC_BOARD_ACTIVE)
612 return 0;
613
614 error = request_irq(bp->irq, rc_interrupt, IRQF_DISABLED,
615 "RISCom/8", bp);
616 if (error)
617 return error;
618
619 rc_out(bp, RC_CTOUT, 0); /* Just in case */
620 bp->DTR = ~0;
621 rc_out(bp, RC_DTR, bp->DTR); /* Drop DTR on all ports */
622
623 bp->flags |= RC_BOARD_ACTIVE;
624
625 return 0;
626 }
627
628 /* Called with disabled interrupts */
629 static void rc_shutdown_board(struct riscom_board *bp)
630 {
631 if (!(bp->flags & RC_BOARD_ACTIVE))
632 return;
633
634 bp->flags &= ~RC_BOARD_ACTIVE;
635
636 free_irq(bp->irq, NULL);
637
638 bp->DTR = ~0;
639 rc_out(bp, RC_DTR, bp->DTR); /* Drop DTR on all ports */
640
641 }
642
643 /*
644 * Setting up port characteristics.
645 * Must be called with disabled interrupts
646 */
647 static void rc_change_speed(struct tty_struct *tty, struct riscom_board *bp,
648 struct riscom_port *port)
649 {
650 unsigned long baud;
651 long tmp;
652 unsigned char cor1 = 0, cor3 = 0;
653 unsigned char mcor1 = 0, mcor2 = 0;
654
655 port->IER = 0;
656 port->COR2 = 0;
657 port->MSVR = MSVR_RTS;
658
659 baud = tty_get_baud_rate(tty);
660
661 /* Select port on the board */
662 rc_out(bp, CD180_CAR, port_No(port));
663
664 if (!baud) {
665 /* Drop DTR & exit */
666 bp->DTR |= (1u << port_No(port));
667 rc_out(bp, RC_DTR, bp->DTR);
668 return;
669 } else {
670 /* Set DTR on */
671 bp->DTR &= ~(1u << port_No(port));
672 rc_out(bp, RC_DTR, bp->DTR);
673 }
674
675 /*
676 * Now we must calculate some speed depended things
677 */
678
679 /* Set baud rate for port */
680 tmp = (((RC_OSCFREQ + baud/2) / baud +
681 CD180_TPC/2) / CD180_TPC);
682
683 rc_out(bp, CD180_RBPRH, (tmp >> 8) & 0xff);
684 rc_out(bp, CD180_TBPRH, (tmp >> 8) & 0xff);
685 rc_out(bp, CD180_RBPRL, tmp & 0xff);
686 rc_out(bp, CD180_TBPRL, tmp & 0xff);
687
688 baud = (baud + 5) / 10; /* Estimated CPS */
689
690 /* Two timer ticks seems enough to wakeup something like SLIP driver */
691 tmp = ((baud + HZ/2) / HZ) * 2 - CD180_NFIFO;
692 port->wakeup_chars = (tmp < 0) ? 0 : ((tmp >= SERIAL_XMIT_SIZE) ?
693 SERIAL_XMIT_SIZE - 1 : tmp);
694
695 /* Receiver timeout will be transmission time for 1.5 chars */
696 tmp = (RISCOM_TPS + RISCOM_TPS/2 + baud/2) / baud;
697 tmp = (tmp > 0xff) ? 0xff : tmp;
698 rc_out(bp, CD180_RTPR, tmp);
699
700 switch (C_CSIZE(tty)) {
701 case CS5:
702 cor1 |= COR1_5BITS;
703 break;
704 case CS6:
705 cor1 |= COR1_6BITS;
706 break;
707 case CS7:
708 cor1 |= COR1_7BITS;
709 break;
710 case CS8:
711 cor1 |= COR1_8BITS;
712 break;
713 }
714 if (C_CSTOPB(tty))
715 cor1 |= COR1_2SB;
716
717 cor1 |= COR1_IGNORE;
718 if (C_PARENB(tty)) {
719 cor1 |= COR1_NORMPAR;
720 if (C_PARODD(tty))
721 cor1 |= COR1_ODDP;
722 if (I_INPCK(tty))
723 cor1 &= ~COR1_IGNORE;
724 }
725 /* Set marking of some errors */
726 port->mark_mask = RCSR_OE | RCSR_TOUT;
727 if (I_INPCK(tty))
728 port->mark_mask |= RCSR_FE | RCSR_PE;
729 if (I_BRKINT(tty) || I_PARMRK(tty))
730 port->mark_mask |= RCSR_BREAK;
731 if (I_IGNPAR(tty))
732 port->mark_mask &= ~(RCSR_FE | RCSR_PE);
733 if (I_IGNBRK(tty)) {
734 port->mark_mask &= ~RCSR_BREAK;
735 if (I_IGNPAR(tty))
736 /* Real raw mode. Ignore all */
737 port->mark_mask &= ~RCSR_OE;
738 }
739 /* Enable Hardware Flow Control */
740 if (C_CRTSCTS(tty)) {
741 #ifdef RISCOM_BRAIN_DAMAGED_CTS
742 port->IER |= IER_DSR | IER_CTS;
743 mcor1 |= MCOR1_DSRZD | MCOR1_CTSZD;
744 mcor2 |= MCOR2_DSROD | MCOR2_CTSOD;
745 tty->hw_stopped = !(rc_in(bp, CD180_MSVR) &
746 (MSVR_CTS|MSVR_DSR));
747 #else
748 port->COR2 |= COR2_CTSAE;
749 #endif
750 }
751 /* Enable Software Flow Control. FIXME: I'm not sure about this */
752 /* Some people reported that it works, but I still doubt */
753 if (I_IXON(tty)) {
754 port->COR2 |= COR2_TXIBE;
755 cor3 |= (COR3_FCT | COR3_SCDE);
756 if (I_IXANY(tty))
757 port->COR2 |= COR2_IXM;
758 rc_out(bp, CD180_SCHR1, START_CHAR(tty));
759 rc_out(bp, CD180_SCHR2, STOP_CHAR(tty));
760 rc_out(bp, CD180_SCHR3, START_CHAR(tty));
761 rc_out(bp, CD180_SCHR4, STOP_CHAR(tty));
762 }
763 if (!C_CLOCAL(tty)) {
764 /* Enable CD check */
765 port->IER |= IER_CD;
766 mcor1 |= MCOR1_CDZD;
767 mcor2 |= MCOR2_CDOD;
768 }
769
770 if (C_CREAD(tty))
771 /* Enable receiver */
772 port->IER |= IER_RXD;
773
774 /* Set input FIFO size (1-8 bytes) */
775 cor3 |= RISCOM_RXFIFO;
776 /* Setting up CD180 channel registers */
777 rc_out(bp, CD180_COR1, cor1);
778 rc_out(bp, CD180_COR2, port->COR2);
779 rc_out(bp, CD180_COR3, cor3);
780 /* Make CD180 know about registers change */
781 rc_wait_CCR(bp);
782 rc_out(bp, CD180_CCR, CCR_CORCHG1 | CCR_CORCHG2 | CCR_CORCHG3);
783 /* Setting up modem option registers */
784 rc_out(bp, CD180_MCOR1, mcor1);
785 rc_out(bp, CD180_MCOR2, mcor2);
786 /* Enable CD180 transmitter & receiver */
787 rc_wait_CCR(bp);
788 rc_out(bp, CD180_CCR, CCR_TXEN | CCR_RXEN);
789 /* Enable interrupts */
790 rc_out(bp, CD180_IER, port->IER);
791 /* And finally set RTS on */
792 rc_out(bp, CD180_MSVR, port->MSVR);
793 }
794
795 /* Must be called with interrupts enabled */
796 static int rc_activate_port(struct tty_port *port, struct tty_struct *tty)
797 {
798 struct riscom_port *rp = container_of(port, struct riscom_port, port);
799 struct riscom_board *bp = port_Board(rp);
800 unsigned long flags;
801
802 if (tty_port_alloc_xmit_buf(port) < 0)
803 return -ENOMEM;
804
805 spin_lock_irqsave(&riscom_lock, flags);
806
807 clear_bit(TTY_IO_ERROR, &tty->flags);
808 bp->count++;
809 rp->xmit_cnt = rp->xmit_head = rp->xmit_tail = 0;
810 rc_change_speed(tty, bp, rp);
811 spin_unlock_irqrestore(&riscom_lock, flags);
812 return 0;
813 }
814
815 /* Must be called with interrupts disabled */
816 static void rc_shutdown_port(struct tty_struct *tty,
817 struct riscom_board *bp, struct riscom_port *port)
818 {
819 #ifdef RC_REPORT_OVERRUN
820 printk(KERN_INFO "rc%d: port %d: Total %ld overruns were detected.\n",
821 board_No(bp), port_No(port), port->overrun);
822 #endif
823 #ifdef RC_REPORT_FIFO
824 {
825 int i;
826
827 printk(KERN_INFO "rc%d: port %d: FIFO hits [ ",
828 board_No(bp), port_No(port));
829 for (i = 0; i < 10; i++)
830 printk("%ld ", port->hits[i]);
831 printk("].\n");
832 }
833 #endif
834 tty_port_free_xmit_buf(&port->port);
835
836 /* Select port */
837 rc_out(bp, CD180_CAR, port_No(port));
838 /* Reset port */
839 rc_wait_CCR(bp);
840 rc_out(bp, CD180_CCR, CCR_SOFTRESET);
841 /* Disable all interrupts from this port */
842 port->IER = 0;
843 rc_out(bp, CD180_IER, port->IER);
844
845 set_bit(TTY_IO_ERROR, &tty->flags);
846
847 if (--bp->count < 0) {
848 printk(KERN_INFO "rc%d: rc_shutdown_port: "
849 "bad board count: %d\n",
850 board_No(bp), bp->count);
851 bp->count = 0;
852 }
853 /*
854 * If this is the last opened port on the board
855 * shutdown whole board
856 */
857 if (!bp->count)
858 rc_shutdown_board(bp);
859 }
860
861 static int carrier_raised(struct tty_port *port)
862 {
863 struct riscom_port *p = container_of(port, struct riscom_port, port);
864 struct riscom_board *bp = port_Board(p);
865 unsigned long flags;
866 int CD;
867
868 spin_lock_irqsave(&riscom_lock, flags);
869 rc_out(bp, CD180_CAR, port_No(p));
870 CD = rc_in(bp, CD180_MSVR) & MSVR_CD;
871 rc_out(bp, CD180_MSVR, MSVR_RTS);
872 bp->DTR &= ~(1u << port_No(p));
873 rc_out(bp, RC_DTR, bp->DTR);
874 spin_unlock_irqrestore(&riscom_lock, flags);
875 return CD;
876 }
877
878 static void dtr_rts(struct tty_port *port, int onoff)
879 {
880 struct riscom_port *p = container_of(port, struct riscom_port, port);
881 struct riscom_board *bp = port_Board(p);
882 unsigned long flags;
883
884 spin_lock_irqsave(&riscom_lock, flags);
885 bp->DTR &= ~(1u << port_No(p));
886 if (onoff == 0)
887 bp->DTR |= (1u << port_No(p));
888 rc_out(bp, RC_DTR, bp->DTR);
889 spin_unlock_irqrestore(&riscom_lock, flags);
890 }
891
892 static int rc_open(struct tty_struct *tty, struct file *filp)
893 {
894 int board;
895 int error;
896 struct riscom_port *port;
897 struct riscom_board *bp;
898
899 board = RC_BOARD(tty->index);
900 if (board >= RC_NBOARD || !(rc_board[board].flags & RC_BOARD_PRESENT))
901 return -ENODEV;
902
903 bp = &rc_board[board];
904 port = rc_port + board * RC_NPORT + RC_PORT(tty->index);
905 if (rc_paranoia_check(port, tty->name, "rc_open"))
906 return -ENODEV;
907
908 error = rc_setup_board(bp);
909 if (error)
910 return error;
911
912 tty->driver_data = port;
913 return tty_port_open(&port->port, tty, filp);
914 }
915
916 static void rc_flush_buffer(struct tty_struct *tty)
917 {
918 struct riscom_port *port = tty->driver_data;
919 unsigned long flags;
920
921 if (rc_paranoia_check(port, tty->name, "rc_flush_buffer"))
922 return;
923
924 spin_lock_irqsave(&riscom_lock, flags);
925 port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
926 spin_unlock_irqrestore(&riscom_lock, flags);
927
928 tty_wakeup(tty);
929 }
930
931 static void rc_close_port(struct tty_port *port)
932 {
933 unsigned long flags;
934 struct riscom_port *rp = container_of(port, struct riscom_port, port);
935 struct riscom_board *bp = port_Board(rp);
936 unsigned long timeout;
937
938 /*
939 * At this point we stop accepting input. To do this, we
940 * disable the receive line status interrupts, and tell the
941 * interrupt driver to stop checking the data ready bit in the
942 * line status register.
943 */
944
945 spin_lock_irqsave(&riscom_lock, flags);
946 rp->IER &= ~IER_RXD;
947
948 rp->IER &= ~IER_TXRDY;
949 rp->IER |= IER_TXEMPTY;
950 rc_out(bp, CD180_CAR, port_No(rp));
951 rc_out(bp, CD180_IER, rp->IER);
952 /*
953 * Before we drop DTR, make sure the UART transmitter
954 * has completely drained; this is especially
955 * important if there is a transmit FIFO!
956 */
957 timeout = jiffies + HZ;
958 while (rp->IER & IER_TXEMPTY) {
959 spin_unlock_irqrestore(&riscom_lock, flags);
960 msleep_interruptible(jiffies_to_msecs(rp->timeout));
961 spin_lock_irqsave(&riscom_lock, flags);
962 if (time_after(jiffies, timeout))
963 break;
964 }
965 rc_shutdown_port(port->tty, bp, rp);
966 spin_unlock_irqrestore(&riscom_lock, flags);
967 }
968
969 static void rc_close(struct tty_struct *tty, struct file *filp)
970 {
971 struct riscom_port *port = tty->driver_data;
972
973 if (!port || rc_paranoia_check(port, tty->name, "close"))
974 return;
975 tty_port_close(&port->port, tty, filp);
976 }
977
978 static int rc_write(struct tty_struct *tty,
979 const unsigned char *buf, int count)
980 {
981 struct riscom_port *port = tty->driver_data;
982 struct riscom_board *bp;
983 int c, total = 0;
984 unsigned long flags;
985
986 if (rc_paranoia_check(port, tty->name, "rc_write"))
987 return 0;
988
989 bp = port_Board(port);
990
991 while (1) {
992 spin_lock_irqsave(&riscom_lock, flags);
993
994 c = min_t(int, count, min(SERIAL_XMIT_SIZE - port->xmit_cnt - 1,
995 SERIAL_XMIT_SIZE - port->xmit_head));
996 if (c <= 0)
997 break; /* lock continues to be held */
998
999 memcpy(port->port.xmit_buf + port->xmit_head, buf, c);
1000 port->xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
1001 port->xmit_cnt += c;
1002
1003 spin_unlock_irqrestore(&riscom_lock, flags);
1004
1005 buf += c;
1006 count -= c;
1007 total += c;
1008 }
1009
1010 if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
1011 !(port->IER & IER_TXRDY)) {
1012 port->IER |= IER_TXRDY;
1013 rc_out(bp, CD180_CAR, port_No(port));
1014 rc_out(bp, CD180_IER, port->IER);
1015 }
1016
1017 spin_unlock_irqrestore(&riscom_lock, flags);
1018
1019 return total;
1020 }
1021
1022 static int rc_put_char(struct tty_struct *tty, unsigned char ch)
1023 {
1024 struct riscom_port *port = tty->driver_data;
1025 unsigned long flags;
1026 int ret = 0;
1027
1028 if (rc_paranoia_check(port, tty->name, "rc_put_char"))
1029 return 0;
1030
1031 spin_lock_irqsave(&riscom_lock, flags);
1032
1033 if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1034 goto out;
1035
1036 port->port.xmit_buf[port->xmit_head++] = ch;
1037 port->xmit_head &= SERIAL_XMIT_SIZE - 1;
1038 port->xmit_cnt++;
1039 ret = 1;
1040
1041 out:
1042 spin_unlock_irqrestore(&riscom_lock, flags);
1043 return ret;
1044 }
1045
1046 static void rc_flush_chars(struct tty_struct *tty)
1047 {
1048 struct riscom_port *port = tty->driver_data;
1049 unsigned long flags;
1050
1051 if (rc_paranoia_check(port, tty->name, "rc_flush_chars"))
1052 return;
1053
1054 if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped)
1055 return;
1056
1057 spin_lock_irqsave(&riscom_lock, flags);
1058
1059 port->IER |= IER_TXRDY;
1060 rc_out(port_Board(port), CD180_CAR, port_No(port));
1061 rc_out(port_Board(port), CD180_IER, port->IER);
1062
1063 spin_unlock_irqrestore(&riscom_lock, flags);
1064 }
1065
1066 static int rc_write_room(struct tty_struct *tty)
1067 {
1068 struct riscom_port *port = tty->driver_data;
1069 int ret;
1070
1071 if (rc_paranoia_check(port, tty->name, "rc_write_room"))
1072 return 0;
1073
1074 ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
1075 if (ret < 0)
1076 ret = 0;
1077 return ret;
1078 }
1079
1080 static int rc_chars_in_buffer(struct tty_struct *tty)
1081 {
1082 struct riscom_port *port = tty->driver_data;
1083
1084 if (rc_paranoia_check(port, tty->name, "rc_chars_in_buffer"))
1085 return 0;
1086
1087 return port->xmit_cnt;
1088 }
1089
1090 static int rc_tiocmget(struct tty_struct *tty, struct file *file)
1091 {
1092 struct riscom_port *port = tty->driver_data;
1093 struct riscom_board *bp;
1094 unsigned char status;
1095 unsigned int result;
1096 unsigned long flags;
1097
1098 if (rc_paranoia_check(port, tty->name, __func__))
1099 return -ENODEV;
1100
1101 bp = port_Board(port);
1102
1103 spin_lock_irqsave(&riscom_lock, flags);
1104
1105 rc_out(bp, CD180_CAR, port_No(port));
1106 status = rc_in(bp, CD180_MSVR);
1107 result = rc_in(bp, RC_RI) & (1u << port_No(port)) ? 0 : TIOCM_RNG;
1108
1109 spin_unlock_irqrestore(&riscom_lock, flags);
1110
1111 result |= ((status & MSVR_RTS) ? TIOCM_RTS : 0)
1112 | ((status & MSVR_DTR) ? TIOCM_DTR : 0)
1113 | ((status & MSVR_CD) ? TIOCM_CAR : 0)
1114 | ((status & MSVR_DSR) ? TIOCM_DSR : 0)
1115 | ((status & MSVR_CTS) ? TIOCM_CTS : 0);
1116 return result;
1117 }
1118
1119 static int rc_tiocmset(struct tty_struct *tty, struct file *file,
1120 unsigned int set, unsigned int clear)
1121 {
1122 struct riscom_port *port = tty->driver_data;
1123 unsigned long flags;
1124 struct riscom_board *bp;
1125
1126 if (rc_paranoia_check(port, tty->name, __func__))
1127 return -ENODEV;
1128
1129 bp = port_Board(port);
1130
1131 spin_lock_irqsave(&riscom_lock, flags);
1132
1133 if (set & TIOCM_RTS)
1134 port->MSVR |= MSVR_RTS;
1135 if (set & TIOCM_DTR)
1136 bp->DTR &= ~(1u << port_No(port));
1137
1138 if (clear & TIOCM_RTS)
1139 port->MSVR &= ~MSVR_RTS;
1140 if (clear & TIOCM_DTR)
1141 bp->DTR |= (1u << port_No(port));
1142
1143 rc_out(bp, CD180_CAR, port_No(port));
1144 rc_out(bp, CD180_MSVR, port->MSVR);
1145 rc_out(bp, RC_DTR, bp->DTR);
1146
1147 spin_unlock_irqrestore(&riscom_lock, flags);
1148
1149 return 0;
1150 }
1151
1152 static int rc_send_break(struct tty_struct *tty, int length)
1153 {
1154 struct riscom_port *port = tty->driver_data;
1155 struct riscom_board *bp = port_Board(port);
1156 unsigned long flags;
1157
1158 if (length == 0 || length == -1)
1159 return -EOPNOTSUPP;
1160
1161 spin_lock_irqsave(&riscom_lock, flags);
1162
1163 port->break_length = RISCOM_TPS / HZ * length;
1164 port->COR2 |= COR2_ETC;
1165 port->IER |= IER_TXRDY;
1166 rc_out(bp, CD180_CAR, port_No(port));
1167 rc_out(bp, CD180_COR2, port->COR2);
1168 rc_out(bp, CD180_IER, port->IER);
1169 rc_wait_CCR(bp);
1170 rc_out(bp, CD180_CCR, CCR_CORCHG2);
1171 rc_wait_CCR(bp);
1172
1173 spin_unlock_irqrestore(&riscom_lock, flags);
1174 return 0;
1175 }
1176
1177 static int rc_set_serial_info(struct tty_struct *tty, struct riscom_port *port,
1178 struct serial_struct __user *newinfo)
1179 {
1180 struct serial_struct tmp;
1181 struct riscom_board *bp = port_Board(port);
1182 int change_speed;
1183
1184 if (copy_from_user(&tmp, newinfo, sizeof(tmp)))
1185 return -EFAULT;
1186
1187 change_speed = ((port->port.flags & ASYNC_SPD_MASK) !=
1188 (tmp.flags & ASYNC_SPD_MASK));
1189
1190 if (!capable(CAP_SYS_ADMIN)) {
1191 if ((tmp.close_delay != port->port.close_delay) ||
1192 (tmp.closing_wait != port->port.closing_wait) ||
1193 ((tmp.flags & ~ASYNC_USR_MASK) !=
1194 (port->port.flags & ~ASYNC_USR_MASK)))
1195 return -EPERM;
1196 port->port.flags = ((port->port.flags & ~ASYNC_USR_MASK) |
1197 (tmp.flags & ASYNC_USR_MASK));
1198 } else {
1199 port->port.flags = ((port->port.flags & ~ASYNC_FLAGS) |
1200 (tmp.flags & ASYNC_FLAGS));
1201 port->port.close_delay = tmp.close_delay;
1202 port->port.closing_wait = tmp.closing_wait;
1203 }
1204 if (change_speed) {
1205 unsigned long flags;
1206
1207 spin_lock_irqsave(&riscom_lock, flags);
1208 rc_change_speed(tty, bp, port);
1209 spin_unlock_irqrestore(&riscom_lock, flags);
1210 }
1211 return 0;
1212 }
1213
1214 static int rc_get_serial_info(struct riscom_port *port,
1215 struct serial_struct __user *retinfo)
1216 {
1217 struct serial_struct tmp;
1218 struct riscom_board *bp = port_Board(port);
1219
1220 memset(&tmp, 0, sizeof(tmp));
1221 tmp.type = PORT_CIRRUS;
1222 tmp.line = port - rc_port;
1223 tmp.port = bp->base;
1224 tmp.irq = bp->irq;
1225 tmp.flags = port->port.flags;
1226 tmp.baud_base = (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC;
1227 tmp.close_delay = port->port.close_delay * HZ/100;
1228 tmp.closing_wait = port->port.closing_wait * HZ/100;
1229 tmp.xmit_fifo_size = CD180_NFIFO;
1230 return copy_to_user(retinfo, &tmp, sizeof(tmp)) ? -EFAULT : 0;
1231 }
1232
1233 static int rc_ioctl(struct tty_struct *tty, struct file *filp,
1234 unsigned int cmd, unsigned long arg)
1235 {
1236 struct riscom_port *port = tty->driver_data;
1237 void __user *argp = (void __user *)arg;
1238 int retval;
1239
1240 if (rc_paranoia_check(port, tty->name, "rc_ioctl"))
1241 return -ENODEV;
1242
1243 switch (cmd) {
1244 case TIOCGSERIAL:
1245 lock_kernel();
1246 retval = rc_get_serial_info(port, argp);
1247 unlock_kernel();
1248 break;
1249 case TIOCSSERIAL:
1250 lock_kernel();
1251 retval = rc_set_serial_info(tty, port, argp);
1252 unlock_kernel();
1253 break;
1254 default:
1255 retval = -ENOIOCTLCMD;
1256 }
1257 return retval;
1258 }
1259
1260 static void rc_throttle(struct tty_struct *tty)
1261 {
1262 struct riscom_port *port = tty->driver_data;
1263 struct riscom_board *bp;
1264 unsigned long flags;
1265
1266 if (rc_paranoia_check(port, tty->name, "rc_throttle"))
1267 return;
1268 bp = port_Board(port);
1269
1270 spin_lock_irqsave(&riscom_lock, flags);
1271 port->MSVR &= ~MSVR_RTS;
1272 rc_out(bp, CD180_CAR, port_No(port));
1273 if (I_IXOFF(tty)) {
1274 rc_wait_CCR(bp);
1275 rc_out(bp, CD180_CCR, CCR_SSCH2);
1276 rc_wait_CCR(bp);
1277 }
1278 rc_out(bp, CD180_MSVR, port->MSVR);
1279 spin_unlock_irqrestore(&riscom_lock, flags);
1280 }
1281
1282 static void rc_unthrottle(struct tty_struct *tty)
1283 {
1284 struct riscom_port *port = tty->driver_data;
1285 struct riscom_board *bp;
1286 unsigned long flags;
1287
1288 if (rc_paranoia_check(port, tty->name, "rc_unthrottle"))
1289 return;
1290 bp = port_Board(port);
1291
1292 spin_lock_irqsave(&riscom_lock, flags);
1293 port->MSVR |= MSVR_RTS;
1294 rc_out(bp, CD180_CAR, port_No(port));
1295 if (I_IXOFF(tty)) {
1296 rc_wait_CCR(bp);
1297 rc_out(bp, CD180_CCR, CCR_SSCH1);
1298 rc_wait_CCR(bp);
1299 }
1300 rc_out(bp, CD180_MSVR, port->MSVR);
1301 spin_unlock_irqrestore(&riscom_lock, flags);
1302 }
1303
1304 static void rc_stop(struct tty_struct *tty)
1305 {
1306 struct riscom_port *port = tty->driver_data;
1307 struct riscom_board *bp;
1308 unsigned long flags;
1309
1310 if (rc_paranoia_check(port, tty->name, "rc_stop"))
1311 return;
1312
1313 bp = port_Board(port);
1314
1315 spin_lock_irqsave(&riscom_lock, flags);
1316 port->IER &= ~IER_TXRDY;
1317 rc_out(bp, CD180_CAR, port_No(port));
1318 rc_out(bp, CD180_IER, port->IER);
1319 spin_unlock_irqrestore(&riscom_lock, flags);
1320 }
1321
1322 static void rc_start(struct tty_struct *tty)
1323 {
1324 struct riscom_port *port = tty->driver_data;
1325 struct riscom_board *bp;
1326 unsigned long flags;
1327
1328 if (rc_paranoia_check(port, tty->name, "rc_start"))
1329 return;
1330
1331 bp = port_Board(port);
1332
1333 spin_lock_irqsave(&riscom_lock, flags);
1334
1335 if (port->xmit_cnt && port->port.xmit_buf && !(port->IER & IER_TXRDY)) {
1336 port->IER |= IER_TXRDY;
1337 rc_out(bp, CD180_CAR, port_No(port));
1338 rc_out(bp, CD180_IER, port->IER);
1339 }
1340 spin_unlock_irqrestore(&riscom_lock, flags);
1341 }
1342
1343 static void rc_hangup(struct tty_struct *tty)
1344 {
1345 struct riscom_port *port = tty->driver_data;
1346
1347 if (rc_paranoia_check(port, tty->name, "rc_hangup"))
1348 return;
1349
1350 tty_port_hangup(&port->port);
1351 }
1352
1353 static void rc_set_termios(struct tty_struct *tty,
1354 struct ktermios *old_termios)
1355 {
1356 struct riscom_port *port = tty->driver_data;
1357 unsigned long flags;
1358
1359 if (rc_paranoia_check(port, tty->name, "rc_set_termios"))
1360 return;
1361
1362 spin_lock_irqsave(&riscom_lock, flags);
1363 rc_change_speed(tty, port_Board(port), port);
1364 spin_unlock_irqrestore(&riscom_lock, flags);
1365
1366 if ((old_termios->c_cflag & CRTSCTS) &&
1367 !(tty->termios->c_cflag & CRTSCTS)) {
1368 tty->hw_stopped = 0;
1369 rc_start(tty);
1370 }
1371 }
1372
1373 static const struct tty_operations riscom_ops = {
1374 .open = rc_open,
1375 .close = rc_close,
1376 .write = rc_write,
1377 .put_char = rc_put_char,
1378 .flush_chars = rc_flush_chars,
1379 .write_room = rc_write_room,
1380 .chars_in_buffer = rc_chars_in_buffer,
1381 .flush_buffer = rc_flush_buffer,
1382 .ioctl = rc_ioctl,
1383 .throttle = rc_throttle,
1384 .unthrottle = rc_unthrottle,
1385 .set_termios = rc_set_termios,
1386 .stop = rc_stop,
1387 .start = rc_start,
1388 .hangup = rc_hangup,
1389 .tiocmget = rc_tiocmget,
1390 .tiocmset = rc_tiocmset,
1391 .break_ctl = rc_send_break,
1392 };
1393
1394 static const struct tty_port_operations riscom_port_ops = {
1395 .carrier_raised = carrier_raised,
1396 .dtr_rts = dtr_rts,
1397 .shutdown = rc_close_port,
1398 .activate = rc_activate_port,
1399 };
1400
1401
1402 static int __init rc_init_drivers(void)
1403 {
1404 int error;
1405 int i;
1406
1407 riscom_driver = alloc_tty_driver(RC_NBOARD * RC_NPORT);
1408 if (!riscom_driver)
1409 return -ENOMEM;
1410
1411 riscom_driver->owner = THIS_MODULE;
1412 riscom_driver->name = "ttyL";
1413 riscom_driver->major = RISCOM8_NORMAL_MAJOR;
1414 riscom_driver->type = TTY_DRIVER_TYPE_SERIAL;
1415 riscom_driver->subtype = SERIAL_TYPE_NORMAL;
1416 riscom_driver->init_termios = tty_std_termios;
1417 riscom_driver->init_termios.c_cflag =
1418 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1419 riscom_driver->init_termios.c_ispeed = 9600;
1420 riscom_driver->init_termios.c_ospeed = 9600;
1421 riscom_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_HARDWARE_BREAK;
1422 tty_set_operations(riscom_driver, &riscom_ops);
1423 error = tty_register_driver(riscom_driver);
1424 if (error != 0) {
1425 put_tty_driver(riscom_driver);
1426 printk(KERN_ERR "rc: Couldn't register RISCom/8 driver, "
1427 "error = %d\n", error);
1428 return 1;
1429 }
1430 memset(rc_port, 0, sizeof(rc_port));
1431 for (i = 0; i < RC_NPORT * RC_NBOARD; i++) {
1432 tty_port_init(&rc_port[i].port);
1433 rc_port[i].port.ops = &riscom_port_ops;
1434 rc_port[i].magic = RISCOM8_MAGIC;
1435 }
1436 return 0;
1437 }
1438
1439 static void rc_release_drivers(void)
1440 {
1441 tty_unregister_driver(riscom_driver);
1442 put_tty_driver(riscom_driver);
1443 }
1444
1445 #ifndef MODULE
1446 /*
1447 * Called at boot time.
1448 *
1449 * You can specify IO base for up to RC_NBOARD cards,
1450 * using line "riscom8=0xiobase1,0xiobase2,.." at LILO prompt.
1451 * Note that there will be no probing at default
1452 * addresses in this case.
1453 *
1454 */
1455 static int __init riscom8_setup(char *str)
1456 {
1457 int ints[RC_NBOARD];
1458 int i;
1459
1460 str = get_options(str, ARRAY_SIZE(ints), ints);
1461
1462 for (i = 0; i < RC_NBOARD; i++) {
1463 if (i < ints[0])
1464 rc_board[i].base = ints[i+1];
1465 else
1466 rc_board[i].base = 0;
1467 }
1468 return 1;
1469 }
1470
1471 __setup("riscom8=", riscom8_setup);
1472 #endif
1473
1474 static char banner[] __initdata =
1475 KERN_INFO "rc: SDL RISCom/8 card driver v1.1, (c) D.Gorodchanin "
1476 "1994-1996.\n";
1477 static char no_boards_msg[] __initdata =
1478 KERN_INFO "rc: No RISCom/8 boards detected.\n";
1479
1480 /*
1481 * This routine must be called by kernel at boot time
1482 */
1483 static int __init riscom8_init(void)
1484 {
1485 int i;
1486 int found = 0;
1487
1488 printk(banner);
1489
1490 if (rc_init_drivers())
1491 return -EIO;
1492
1493 for (i = 0; i < RC_NBOARD; i++)
1494 if (rc_board[i].base && !rc_probe(&rc_board[i]))
1495 found++;
1496 if (!found) {
1497 rc_release_drivers();
1498 printk(no_boards_msg);
1499 return -EIO;
1500 }
1501 return 0;
1502 }
1503
1504 #ifdef MODULE
1505 static int iobase;
1506 static int iobase1;
1507 static int iobase2;
1508 static int iobase3;
1509 module_param(iobase, int, 0);
1510 module_param(iobase1, int, 0);
1511 module_param(iobase2, int, 0);
1512 module_param(iobase3, int, 0);
1513
1514 MODULE_LICENSE("GPL");
1515 MODULE_ALIAS_CHARDEV_MAJOR(RISCOM8_NORMAL_MAJOR);
1516 #endif /* MODULE */
1517
1518 /*
1519 * You can setup up to 4 boards (current value of RC_NBOARD)
1520 * by specifying "iobase=0xXXX iobase1=0xXXX ..." as insmod parameter.
1521 *
1522 */
1523 static int __init riscom8_init_module(void)
1524 {
1525 #ifdef MODULE
1526 int i;
1527
1528 if (iobase || iobase1 || iobase2 || iobase3) {
1529 for (i = 0; i < RC_NBOARD; i++)
1530 rc_board[i].base = 0;
1531 }
1532
1533 if (iobase)
1534 rc_board[0].base = iobase;
1535 if (iobase1)
1536 rc_board[1].base = iobase1;
1537 if (iobase2)
1538 rc_board[2].base = iobase2;
1539 if (iobase3)
1540 rc_board[3].base = iobase3;
1541 #endif /* MODULE */
1542
1543 return riscom8_init();
1544 }
1545
1546 static void __exit riscom8_exit_module(void)
1547 {
1548 int i;
1549
1550 rc_release_drivers();
1551 for (i = 0; i < RC_NBOARD; i++)
1552 if (rc_board[i].flags & RC_BOARD_PRESENT)
1553 rc_release_io_range(&rc_board[i]);
1554
1555 }
1556
1557 module_init(riscom8_init_module);
1558 module_exit(riscom8_exit_module);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree