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Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / char / riscom8.c
blob171711acf5cd33736ebb74d69a6f02983b15bdb3
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 = port->port.tty;
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 return;
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 return;
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 (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 tty_insert_flip_char(tty, ch, flag);
384 tty_flip_buffer_push(tty);
385 }
386
387 static void rc_receive(struct riscom_board const *bp)
388 {
389 struct riscom_port *port;
390 struct tty_struct *tty;
391 unsigned char count;
392
393 port = rc_get_port(bp, "Receive");
394 if (port == NULL)
395 return;
396
397 tty = port->port.tty;
398
399 count = rc_in(bp, CD180_RDCR);
400
401 #ifdef RC_REPORT_FIFO
402 port->hits[count > 8 ? 9 : count]++;
403 #endif
404
405 while (count--) {
406 if (tty_buffer_request_room(tty, 1) == 0) {
407 printk(KERN_WARNING "rc%d: port %d: Working around "
408 "flip buffer overflow.\n",
409 board_No(bp), port_No(port));
410 break;
411 }
412 tty_insert_flip_char(tty, rc_in(bp, CD180_RDR), TTY_NORMAL);
413 }
414 tty_flip_buffer_push(tty);
415 }
416
417 static void rc_transmit(struct riscom_board const *bp)
418 {
419 struct riscom_port *port;
420 struct tty_struct *tty;
421 unsigned char count;
422
423 port = rc_get_port(bp, "Transmit");
424 if (port == NULL)
425 return;
426
427 tty = port->port.tty;
428
429 if (port->IER & IER_TXEMPTY) {
430 /* FIFO drained */
431 rc_out(bp, CD180_CAR, port_No(port));
432 port->IER &= ~IER_TXEMPTY;
433 rc_out(bp, CD180_IER, port->IER);
434 return;
435 }
436
437 if ((port->xmit_cnt <= 0 && !port->break_length)
438 || tty->stopped || tty->hw_stopped) {
439 rc_out(bp, CD180_CAR, port_No(port));
440 port->IER &= ~IER_TXRDY;
441 rc_out(bp, CD180_IER, port->IER);
442 return;
443 }
444
445 if (port->break_length) {
446 if (port->break_length > 0) {
447 if (port->COR2 & COR2_ETC) {
448 rc_out(bp, CD180_TDR, CD180_C_ESC);
449 rc_out(bp, CD180_TDR, CD180_C_SBRK);
450 port->COR2 &= ~COR2_ETC;
451 }
452 count = min_t(int, port->break_length, 0xff);
453 rc_out(bp, CD180_TDR, CD180_C_ESC);
454 rc_out(bp, CD180_TDR, CD180_C_DELAY);
455 rc_out(bp, CD180_TDR, count);
456 port->break_length -= count;
457 if (port->break_length == 0)
458 port->break_length--;
459 } else {
460 rc_out(bp, CD180_TDR, CD180_C_ESC);
461 rc_out(bp, CD180_TDR, CD180_C_EBRK);
462 rc_out(bp, CD180_COR2, port->COR2);
463 rc_wait_CCR(bp);
464 rc_out(bp, CD180_CCR, CCR_CORCHG2);
465 port->break_length = 0;
466 }
467 return;
468 }
469
470 count = CD180_NFIFO;
471 do {
472 rc_out(bp, CD180_TDR, port->port.xmit_buf[port->xmit_tail++]);
473 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE-1);
474 if (--port->xmit_cnt <= 0)
475 break;
476 } while (--count > 0);
477
478 if (port->xmit_cnt <= 0) {
479 rc_out(bp, CD180_CAR, port_No(port));
480 port->IER &= ~IER_TXRDY;
481 rc_out(bp, CD180_IER, port->IER);
482 }
483 if (port->xmit_cnt <= port->wakeup_chars)
484 tty_wakeup(tty);
485 }
486
487 static void rc_check_modem(struct riscom_board const *bp)
488 {
489 struct riscom_port *port;
490 struct tty_struct *tty;
491 unsigned char mcr;
492
493 port = rc_get_port(bp, "Modem");
494 if (port == NULL)
495 return;
496
497 tty = port->port.tty;
498
499 mcr = rc_in(bp, CD180_MCR);
500 if (mcr & MCR_CDCHG) {
501 if (rc_in(bp, CD180_MSVR) & MSVR_CD)
502 wake_up_interruptible(&port->port.open_wait);
503 else
504 tty_hangup(tty);
505 }
506
507 #ifdef RISCOM_BRAIN_DAMAGED_CTS
508 if (mcr & MCR_CTSCHG) {
509 if (rc_in(bp, CD180_MSVR) & MSVR_CTS) {
510 tty->hw_stopped = 0;
511 port->IER |= IER_TXRDY;
512 if (port->xmit_cnt <= port->wakeup_chars)
513 tty_wakeup(tty);
514 } else {
515 tty->hw_stopped = 1;
516 port->IER &= ~IER_TXRDY;
517 }
518 rc_out(bp, CD180_IER, port->IER);
519 }
520 if (mcr & MCR_DSRCHG) {
521 if (rc_in(bp, CD180_MSVR) & MSVR_DSR) {
522 tty->hw_stopped = 0;
523 port->IER |= IER_TXRDY;
524 if (port->xmit_cnt <= port->wakeup_chars)
525 tty_wakeup(tty);
526 } else {
527 tty->hw_stopped = 1;
528 port->IER &= ~IER_TXRDY;
529 }
530 rc_out(bp, CD180_IER, port->IER);
531 }
532 #endif /* RISCOM_BRAIN_DAMAGED_CTS */
533
534 /* Clear change bits */
535 rc_out(bp, CD180_MCR, 0);
536 }
537
538 /* The main interrupt processing routine */
539 static irqreturn_t rc_interrupt(int dummy, void *dev_id)
540 {
541 unsigned char status;
542 unsigned char ack;
543 struct riscom_board *bp = dev_id;
544 unsigned long loop = 0;
545 int handled = 0;
546
547 if (!(bp->flags & RC_BOARD_ACTIVE))
548 return IRQ_NONE;
549
550 while ((++loop < 16) && ((status = ~(rc_in(bp, RC_BSR))) &
551 (RC_BSR_TOUT | RC_BSR_TINT |
552 RC_BSR_MINT | RC_BSR_RINT))) {
553 handled = 1;
554 if (status & RC_BSR_TOUT)
555 printk(KERN_WARNING "rc%d: Got timeout. Hardware "
556 "error?\n", board_No(bp));
557 else if (status & RC_BSR_RINT) {
558 ack = rc_in(bp, RC_ACK_RINT);
559 if (ack == (RC_ID | GIVR_IT_RCV))
560 rc_receive(bp);
561 else if (ack == (RC_ID | GIVR_IT_REXC))
562 rc_receive_exc(bp);
563 else
564 printk(KERN_WARNING "rc%d: Bad receive ack "
565 "0x%02x.\n",
566 board_No(bp), ack);
567 } else if (status & RC_BSR_TINT) {
568 ack = rc_in(bp, RC_ACK_TINT);
569 if (ack == (RC_ID | GIVR_IT_TX))
570 rc_transmit(bp);
571 else
572 printk(KERN_WARNING "rc%d: Bad transmit ack "
573 "0x%02x.\n",
574 board_No(bp), ack);
575 } else /* if (status & RC_BSR_MINT) */ {
576 ack = rc_in(bp, RC_ACK_MINT);
577 if (ack == (RC_ID | GIVR_IT_MODEM))
578 rc_check_modem(bp);
579 else
580 printk(KERN_WARNING "rc%d: Bad modem ack "
581 "0x%02x.\n",
582 board_No(bp), ack);
583 }
584 rc_out(bp, CD180_EOIR, 0); /* Mark end of interrupt */
585 rc_out(bp, RC_CTOUT, 0); /* Clear timeout flag */
586 }
587 return IRQ_RETVAL(handled);
588 }
589
590 /*
591 * Routines for open & close processing.
592 */
593
594 /* Called with disabled interrupts */
595 static int rc_setup_board(struct riscom_board *bp)
596 {
597 int error;
598
599 if (bp->flags & RC_BOARD_ACTIVE)
600 return 0;
601
602 error = request_irq(bp->irq, rc_interrupt, IRQF_DISABLED,
603 "RISCom/8", bp);
604 if (error)
605 return error;
606
607 rc_out(bp, RC_CTOUT, 0); /* Just in case */
608 bp->DTR = ~0;
609 rc_out(bp, RC_DTR, bp->DTR); /* Drop DTR on all ports */
610
611 bp->flags |= RC_BOARD_ACTIVE;
612
613 return 0;
614 }
615
616 /* Called with disabled interrupts */
617 static void rc_shutdown_board(struct riscom_board *bp)
618 {
619 if (!(bp->flags & RC_BOARD_ACTIVE))
620 return;
621
622 bp->flags &= ~RC_BOARD_ACTIVE;
623
624 free_irq(bp->irq, NULL);
625
626 bp->DTR = ~0;
627 rc_out(bp, RC_DTR, bp->DTR); /* Drop DTR on all ports */
628
629 }
630
631 /*
632 * Setting up port characteristics.
633 * Must be called with disabled interrupts
634 */
635 static void rc_change_speed(struct riscom_board *bp, struct riscom_port *port)
636 {
637 struct tty_struct *tty = port->port.tty;
638 unsigned long baud;
639 long tmp;
640 unsigned char cor1 = 0, cor3 = 0;
641 unsigned char mcor1 = 0, mcor2 = 0;
642
643 port->IER = 0;
644 port->COR2 = 0;
645 port->MSVR = MSVR_RTS;
646
647 baud = tty_get_baud_rate(tty);
648
649 /* Select port on the board */
650 rc_out(bp, CD180_CAR, port_No(port));
651
652 if (!baud) {
653 /* Drop DTR & exit */
654 bp->DTR |= (1u << port_No(port));
655 rc_out(bp, RC_DTR, bp->DTR);
656 return;
657 } else {
658 /* Set DTR on */
659 bp->DTR &= ~(1u << port_No(port));
660 rc_out(bp, RC_DTR, bp->DTR);
661 }
662
663 /*
664 * Now we must calculate some speed depended things
665 */
666
667 /* Set baud rate for port */
668 tmp = (((RC_OSCFREQ + baud/2) / baud +
669 CD180_TPC/2) / CD180_TPC);
670
671 rc_out(bp, CD180_RBPRH, (tmp >> 8) & 0xff);
672 rc_out(bp, CD180_TBPRH, (tmp >> 8) & 0xff);
673 rc_out(bp, CD180_RBPRL, tmp & 0xff);
674 rc_out(bp, CD180_TBPRL, tmp & 0xff);
675
676 baud = (baud + 5) / 10; /* Estimated CPS */
677
678 /* Two timer ticks seems enough to wakeup something like SLIP driver */
679 tmp = ((baud + HZ/2) / HZ) * 2 - CD180_NFIFO;
680 port->wakeup_chars = (tmp < 0) ? 0 : ((tmp >= SERIAL_XMIT_SIZE) ?
681 SERIAL_XMIT_SIZE - 1 : tmp);
682
683 /* Receiver timeout will be transmission time for 1.5 chars */
684 tmp = (RISCOM_TPS + RISCOM_TPS/2 + baud/2) / baud;
685 tmp = (tmp > 0xff) ? 0xff : tmp;
686 rc_out(bp, CD180_RTPR, tmp);
687
688 switch (C_CSIZE(tty)) {
689 case CS5:
690 cor1 |= COR1_5BITS;
691 break;
692 case CS6:
693 cor1 |= COR1_6BITS;
694 break;
695 case CS7:
696 cor1 |= COR1_7BITS;
697 break;
698 case CS8:
699 cor1 |= COR1_8BITS;
700 break;
701 }
702 if (C_CSTOPB(tty))
703 cor1 |= COR1_2SB;
704
705 cor1 |= COR1_IGNORE;
706 if (C_PARENB(tty)) {
707 cor1 |= COR1_NORMPAR;
708 if (C_PARODD(tty))
709 cor1 |= COR1_ODDP;
710 if (I_INPCK(tty))
711 cor1 &= ~COR1_IGNORE;
712 }
713 /* Set marking of some errors */
714 port->mark_mask = RCSR_OE | RCSR_TOUT;
715 if (I_INPCK(tty))
716 port->mark_mask |= RCSR_FE | RCSR_PE;
717 if (I_BRKINT(tty) || I_PARMRK(tty))
718 port->mark_mask |= RCSR_BREAK;
719 if (I_IGNPAR(tty))
720 port->mark_mask &= ~(RCSR_FE | RCSR_PE);
721 if (I_IGNBRK(tty)) {
722 port->mark_mask &= ~RCSR_BREAK;
723 if (I_IGNPAR(tty))
724 /* Real raw mode. Ignore all */
725 port->mark_mask &= ~RCSR_OE;
726 }
727 /* Enable Hardware Flow Control */
728 if (C_CRTSCTS(tty)) {
729 #ifdef RISCOM_BRAIN_DAMAGED_CTS
730 port->IER |= IER_DSR | IER_CTS;
731 mcor1 |= MCOR1_DSRZD | MCOR1_CTSZD;
732 mcor2 |= MCOR2_DSROD | MCOR2_CTSOD;
733 tty->hw_stopped = !(rc_in(bp, CD180_MSVR) &
734 (MSVR_CTS|MSVR_DSR));
735 #else
736 port->COR2 |= COR2_CTSAE;
737 #endif
738 }
739 /* Enable Software Flow Control. FIXME: I'm not sure about this */
740 /* Some people reported that it works, but I still doubt */
741 if (I_IXON(tty)) {
742 port->COR2 |= COR2_TXIBE;
743 cor3 |= (COR3_FCT | COR3_SCDE);
744 if (I_IXANY(tty))
745 port->COR2 |= COR2_IXM;
746 rc_out(bp, CD180_SCHR1, START_CHAR(tty));
747 rc_out(bp, CD180_SCHR2, STOP_CHAR(tty));
748 rc_out(bp, CD180_SCHR3, START_CHAR(tty));
749 rc_out(bp, CD180_SCHR4, STOP_CHAR(tty));
750 }
751 if (!C_CLOCAL(tty)) {
752 /* Enable CD check */
753 port->IER |= IER_CD;
754 mcor1 |= MCOR1_CDZD;
755 mcor2 |= MCOR2_CDOD;
756 }
757
758 if (C_CREAD(tty))
759 /* Enable receiver */
760 port->IER |= IER_RXD;
761
762 /* Set input FIFO size (1-8 bytes) */
763 cor3 |= RISCOM_RXFIFO;
764 /* Setting up CD180 channel registers */
765 rc_out(bp, CD180_COR1, cor1);
766 rc_out(bp, CD180_COR2, port->COR2);
767 rc_out(bp, CD180_COR3, cor3);
768 /* Make CD180 know about registers change */
769 rc_wait_CCR(bp);
770 rc_out(bp, CD180_CCR, CCR_CORCHG1 | CCR_CORCHG2 | CCR_CORCHG3);
771 /* Setting up modem option registers */
772 rc_out(bp, CD180_MCOR1, mcor1);
773 rc_out(bp, CD180_MCOR2, mcor2);
774 /* Enable CD180 transmitter & receiver */
775 rc_wait_CCR(bp);
776 rc_out(bp, CD180_CCR, CCR_TXEN | CCR_RXEN);
777 /* Enable interrupts */
778 rc_out(bp, CD180_IER, port->IER);
779 /* And finally set RTS on */
780 rc_out(bp, CD180_MSVR, port->MSVR);
781 }
782
783 /* Must be called with interrupts enabled */
784 static int rc_setup_port(struct riscom_board *bp, struct riscom_port *port)
785 {
786 unsigned long flags;
787
788 if (port->port.flags & ASYNC_INITIALIZED)
789 return 0;
790
791 if (tty_port_alloc_xmit_buf(&port->port) < 0)
792 return -ENOMEM;
793
794 spin_lock_irqsave(&riscom_lock, flags);
795
796 clear_bit(TTY_IO_ERROR, &port->port.tty->flags);
797 if (port->port.count == 1)
798 bp->count++;
799 port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
800 rc_change_speed(bp, port);
801 port->port.flags |= ASYNC_INITIALIZED;
802
803 spin_unlock_irqrestore(&riscom_lock, flags);
804 return 0;
805 }
806
807 /* Must be called with interrupts disabled */
808 static void rc_shutdown_port(struct tty_struct *tty,
809 struct riscom_board *bp, struct riscom_port *port)
810 {
811 if (!(port->port.flags & ASYNC_INITIALIZED))
812 return;
813
814 #ifdef RC_REPORT_OVERRUN
815 printk(KERN_INFO "rc%d: port %d: Total %ld overruns were detected.\n",
816 board_No(bp), port_No(port), port->overrun);
817 #endif
818 #ifdef RC_REPORT_FIFO
819 {
820 int i;
821
822 printk(KERN_INFO "rc%d: port %d: FIFO hits [ ",
823 board_No(bp), port_No(port));
824 for (i = 0; i < 10; i++)
825 printk("%ld ", port->hits[i]);
826 printk("].\n");
827 }
828 #endif
829 tty_port_free_xmit_buf(&port->port);
830 if (C_HUPCL(tty)) {
831 /* Drop DTR */
832 bp->DTR |= (1u << port_No(port));
833 rc_out(bp, RC_DTR, bp->DTR);
834 }
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 port->port.flags &= ~ASYNC_INITIALIZED;
847
848 if (--bp->count < 0) {
849 printk(KERN_INFO "rc%d: rc_shutdown_port: "
850 "bad board count: %d\n",
851 board_No(bp), bp->count);
852 bp->count = 0;
853 }
854 /*
855 * If this is the last opened port on the board
856 * shutdown whole board
857 */
858 if (!bp->count)
859 rc_shutdown_board(bp);
860 }
861
862 static int carrier_raised(struct tty_port *port)
863 {
864 struct riscom_port *p = container_of(port, struct riscom_port, port);
865 struct riscom_board *bp = port_Board(p);
866 unsigned long flags;
867 int CD;
868
869 spin_lock_irqsave(&riscom_lock, flags);
870 rc_out(bp, CD180_CAR, port_No(p));
871 CD = rc_in(bp, CD180_MSVR) & MSVR_CD;
872 rc_out(bp, CD180_MSVR, MSVR_RTS);
873 bp->DTR &= ~(1u << port_No(p));
874 rc_out(bp, RC_DTR, bp->DTR);
875 spin_unlock_irqrestore(&riscom_lock, flags);
876 return CD;
877 }
878
879 static int rc_open(struct tty_struct *tty, struct file *filp)
880 {
881 int board;
882 int error;
883 struct riscom_port *port;
884 struct riscom_board *bp;
885
886 board = RC_BOARD(tty->index);
887 if (board >= RC_NBOARD || !(rc_board[board].flags & RC_BOARD_PRESENT))
888 return -ENODEV;
889
890 bp = &rc_board[board];
891 port = rc_port + board * RC_NPORT + RC_PORT(tty->index);
892 if (rc_paranoia_check(port, tty->name, "rc_open"))
893 return -ENODEV;
894
895 error = rc_setup_board(bp);
896 if (error)
897 return error;
898
899 port->port.count++;
900 tty->driver_data = port;
901 port->port.tty = tty;
902
903 error = rc_setup_port(bp, port);
904 if (error == 0)
905 error = tty_port_block_til_ready(&port->port, tty, filp);
906 return error;
907 }
908
909 static void rc_flush_buffer(struct tty_struct *tty)
910 {
911 struct riscom_port *port = tty->driver_data;
912 unsigned long flags;
913
914 if (rc_paranoia_check(port, tty->name, "rc_flush_buffer"))
915 return;
916
917 spin_lock_irqsave(&riscom_lock, flags);
918 port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
919 spin_unlock_irqrestore(&riscom_lock, flags);
920
921 tty_wakeup(tty);
922 }
923
924 static void rc_close(struct tty_struct *tty, struct file *filp)
925 {
926 struct riscom_port *port = tty->driver_data;
927 struct riscom_board *bp;
928 unsigned long flags;
929 unsigned long timeout;
930
931 if (!port || rc_paranoia_check(port, tty->name, "close"))
932 return;
933
934 bp = port_Board(port);
935
936 if (tty_port_close_start(&port->port, tty, filp) == 0)
937 return;
938
939 /*
940 * At this point we stop accepting input. To do this, we
941 * disable the receive line status interrupts, and tell the
942 * interrupt driver to stop checking the data ready bit in the
943 * line status register.
944 */
945
946 spin_lock_irqsave(&riscom_lock, flags);
947 port->IER &= ~IER_RXD;
948 if (port->port.flags & ASYNC_INITIALIZED) {
949 port->IER &= ~IER_TXRDY;
950 port->IER |= IER_TXEMPTY;
951 rc_out(bp, CD180_CAR, port_No(port));
952 rc_out(bp, CD180_IER, port->IER);
953 /*
954 * Before we drop DTR, make sure the UART transmitter
955 * has completely drained; this is especially
956 * important if there is a transmit FIFO!
957 */
958 timeout = jiffies + HZ;
959 while (port->IER & IER_TXEMPTY) {
960 spin_unlock_irqrestore(&riscom_lock, flags);
961 msleep_interruptible(jiffies_to_msecs(port->timeout));
962 spin_lock_irqsave(&riscom_lock, flags);
963 if (time_after(jiffies, timeout))
964 break;
965 }
966 }
967 rc_shutdown_port(tty, bp, port);
968 rc_flush_buffer(tty);
969 spin_unlock_irqrestore(&riscom_lock, flags);
970
971 tty_port_close_end(&port->port, tty);
972 }
973
974 static int rc_write(struct tty_struct *tty,
975 const unsigned char *buf, int count)
976 {
977 struct riscom_port *port = tty->driver_data;
978 struct riscom_board *bp;
979 int c, total = 0;
980 unsigned long flags;
981
982 if (rc_paranoia_check(port, tty->name, "rc_write"))
983 return 0;
984
985 bp = port_Board(port);
986
987 while (1) {
988 spin_lock_irqsave(&riscom_lock, flags);
989
990 c = min_t(int, count, min(SERIAL_XMIT_SIZE - port->xmit_cnt - 1,
991 SERIAL_XMIT_SIZE - port->xmit_head));
992 if (c <= 0)
993 break; /* lock continues to be held */
994
995 memcpy(port->port.xmit_buf + port->xmit_head, buf, c);
996 port->xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
997 port->xmit_cnt += c;
998
999 spin_unlock_irqrestore(&riscom_lock, flags);
1000
1001 buf += c;
1002 count -= c;
1003 total += c;
1004 }
1005
1006 if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
1007 !(port->IER & IER_TXRDY)) {
1008 port->IER |= IER_TXRDY;
1009 rc_out(bp, CD180_CAR, port_No(port));
1010 rc_out(bp, CD180_IER, port->IER);
1011 }
1012
1013 spin_unlock_irqrestore(&riscom_lock, flags);
1014
1015 return total;
1016 }
1017
1018 static int rc_put_char(struct tty_struct *tty, unsigned char ch)
1019 {
1020 struct riscom_port *port = tty->driver_data;
1021 unsigned long flags;
1022 int ret = 0;
1023
1024 if (rc_paranoia_check(port, tty->name, "rc_put_char"))
1025 return 0;
1026
1027 spin_lock_irqsave(&riscom_lock, flags);
1028
1029 if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1030 goto out;
1031
1032 port->port.xmit_buf[port->xmit_head++] = ch;
1033 port->xmit_head &= SERIAL_XMIT_SIZE - 1;
1034 port->xmit_cnt++;
1035 ret = 1;
1036
1037 out:
1038 spin_unlock_irqrestore(&riscom_lock, flags);
1039 return ret;
1040 }
1041
1042 static void rc_flush_chars(struct tty_struct *tty)
1043 {
1044 struct riscom_port *port = tty->driver_data;
1045 unsigned long flags;
1046
1047 if (rc_paranoia_check(port, tty->name, "rc_flush_chars"))
1048 return;
1049
1050 if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped)
1051 return;
1052
1053 spin_lock_irqsave(&riscom_lock, flags);
1054
1055 port->IER |= IER_TXRDY;
1056 rc_out(port_Board(port), CD180_CAR, port_No(port));
1057 rc_out(port_Board(port), CD180_IER, port->IER);
1058
1059 spin_unlock_irqrestore(&riscom_lock, flags);
1060 }
1061
1062 static int rc_write_room(struct tty_struct *tty)
1063 {
1064 struct riscom_port *port = tty->driver_data;
1065 int ret;
1066
1067 if (rc_paranoia_check(port, tty->name, "rc_write_room"))
1068 return 0;
1069
1070 ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
1071 if (ret < 0)
1072 ret = 0;
1073 return ret;
1074 }
1075
1076 static int rc_chars_in_buffer(struct tty_struct *tty)
1077 {
1078 struct riscom_port *port = tty->driver_data;
1079
1080 if (rc_paranoia_check(port, tty->name, "rc_chars_in_buffer"))
1081 return 0;
1082
1083 return port->xmit_cnt;
1084 }
1085
1086 static int rc_tiocmget(struct tty_struct *tty, struct file *file)
1087 {
1088 struct riscom_port *port = tty->driver_data;
1089 struct riscom_board *bp;
1090 unsigned char status;
1091 unsigned int result;
1092 unsigned long flags;
1093
1094 if (rc_paranoia_check(port, tty->name, __func__))
1095 return -ENODEV;
1096
1097 bp = port_Board(port);
1098
1099 spin_lock_irqsave(&riscom_lock, flags);
1100
1101 rc_out(bp, CD180_CAR, port_No(port));
1102 status = rc_in(bp, CD180_MSVR);
1103 result = rc_in(bp, RC_RI) & (1u << port_No(port)) ? 0 : TIOCM_RNG;
1104
1105 spin_unlock_irqrestore(&riscom_lock, flags);
1106
1107 result |= ((status & MSVR_RTS) ? TIOCM_RTS : 0)
1108 | ((status & MSVR_DTR) ? TIOCM_DTR : 0)
1109 | ((status & MSVR_CD) ? TIOCM_CAR : 0)
1110 | ((status & MSVR_DSR) ? TIOCM_DSR : 0)
1111 | ((status & MSVR_CTS) ? TIOCM_CTS : 0);
1112 return result;
1113 }
1114
1115 static int rc_tiocmset(struct tty_struct *tty, struct file *file,
1116 unsigned int set, unsigned int clear)
1117 {
1118 struct riscom_port *port = tty->driver_data;
1119 unsigned long flags;
1120 struct riscom_board *bp;
1121
1122 if (rc_paranoia_check(port, tty->name, __func__))
1123 return -ENODEV;
1124
1125 bp = port_Board(port);
1126
1127 spin_lock_irqsave(&riscom_lock, flags);
1128
1129 if (set & TIOCM_RTS)
1130 port->MSVR |= MSVR_RTS;
1131 if (set & TIOCM_DTR)
1132 bp->DTR &= ~(1u << port_No(port));
1133
1134 if (clear & TIOCM_RTS)
1135 port->MSVR &= ~MSVR_RTS;
1136 if (clear & TIOCM_DTR)
1137 bp->DTR |= (1u << port_No(port));
1138
1139 rc_out(bp, CD180_CAR, port_No(port));
1140 rc_out(bp, CD180_MSVR, port->MSVR);
1141 rc_out(bp, RC_DTR, bp->DTR);
1142
1143 spin_unlock_irqrestore(&riscom_lock, flags);
1144
1145 return 0;
1146 }
1147
1148 static int rc_send_break(struct tty_struct *tty, int length)
1149 {
1150 struct riscom_port *port = tty->driver_data;
1151 struct riscom_board *bp = port_Board(port);
1152 unsigned long flags;
1153
1154 if (length == 0 || length == -1)
1155 return -EOPNOTSUPP;
1156
1157 spin_lock_irqsave(&riscom_lock, flags);
1158
1159 port->break_length = RISCOM_TPS / HZ * length;
1160 port->COR2 |= COR2_ETC;
1161 port->IER |= IER_TXRDY;
1162 rc_out(bp, CD180_CAR, port_No(port));
1163 rc_out(bp, CD180_COR2, port->COR2);
1164 rc_out(bp, CD180_IER, port->IER);
1165 rc_wait_CCR(bp);
1166 rc_out(bp, CD180_CCR, CCR_CORCHG2);
1167 rc_wait_CCR(bp);
1168
1169 spin_unlock_irqrestore(&riscom_lock, flags);
1170 return 0;
1171 }
1172
1173 static int rc_set_serial_info(struct riscom_port *port,
1174 struct serial_struct __user *newinfo)
1175 {
1176 struct serial_struct tmp;
1177 struct riscom_board *bp = port_Board(port);
1178 int change_speed;
1179
1180 if (copy_from_user(&tmp, newinfo, sizeof(tmp)))
1181 return -EFAULT;
1182
1183 #if 0
1184 if ((tmp.irq != bp->irq) ||
1185 (tmp.port != bp->base) ||
1186 (tmp.type != PORT_CIRRUS) ||
1187 (tmp.baud_base != (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC) ||
1188 (tmp.custom_divisor != 0) ||
1189 (tmp.xmit_fifo_size != CD180_NFIFO) ||
1190 (tmp.flags & ~RISCOM_LEGAL_FLAGS))
1191 return -EINVAL;
1192 #endif
1193
1194 change_speed = ((port->port.flags & ASYNC_SPD_MASK) !=
1195 (tmp.flags & ASYNC_SPD_MASK));
1196
1197 if (!capable(CAP_SYS_ADMIN)) {
1198 if ((tmp.close_delay != port->port.close_delay) ||
1199 (tmp.closing_wait != port->port.closing_wait) ||
1200 ((tmp.flags & ~ASYNC_USR_MASK) !=
1201 (port->port.flags & ~ASYNC_USR_MASK)))
1202 return -EPERM;
1203 port->port.flags = ((port->port.flags & ~ASYNC_USR_MASK) |
1204 (tmp.flags & ASYNC_USR_MASK));
1205 } else {
1206 port->port.flags = ((port->port.flags & ~ASYNC_FLAGS) |
1207 (tmp.flags & ASYNC_FLAGS));
1208 port->port.close_delay = tmp.close_delay;
1209 port->port.closing_wait = tmp.closing_wait;
1210 }
1211 if (change_speed) {
1212 unsigned long flags;
1213
1214 spin_lock_irqsave(&riscom_lock, flags);
1215 rc_change_speed(bp, port);
1216 spin_unlock_irqrestore(&riscom_lock, flags);
1217 }
1218 return 0;
1219 }
1220
1221 static int rc_get_serial_info(struct riscom_port *port,
1222 struct serial_struct __user *retinfo)
1223 {
1224 struct serial_struct tmp;
1225 struct riscom_board *bp = port_Board(port);
1226
1227 memset(&tmp, 0, sizeof(tmp));
1228 tmp.type = PORT_CIRRUS;
1229 tmp.line = port - rc_port;
1230 tmp.port = bp->base;
1231 tmp.irq = bp->irq;
1232 tmp.flags = port->port.flags;
1233 tmp.baud_base = (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC;
1234 tmp.close_delay = port->port.close_delay * HZ/100;
1235 tmp.closing_wait = port->port.closing_wait * HZ/100;
1236 tmp.xmit_fifo_size = CD180_NFIFO;
1237 return copy_to_user(retinfo, &tmp, sizeof(tmp)) ? -EFAULT : 0;
1238 }
1239
1240 static int rc_ioctl(struct tty_struct *tty, struct file *filp,
1241 unsigned int cmd, unsigned long arg)
1242 {
1243 struct riscom_port *port = tty->driver_data;
1244 void __user *argp = (void __user *)arg;
1245 int retval;
1246
1247 if (rc_paranoia_check(port, tty->name, "rc_ioctl"))
1248 return -ENODEV;
1249
1250 switch (cmd) {
1251 case TIOCGSERIAL:
1252 lock_kernel();
1253 retval = rc_get_serial_info(port, argp);
1254 unlock_kernel();
1255 break;
1256 case TIOCSSERIAL:
1257 lock_kernel();
1258 retval = rc_set_serial_info(port, argp);
1259 unlock_kernel();
1260 break;
1261 default:
1262 retval = -ENOIOCTLCMD;
1263 }
1264 return retval;
1265 }
1266
1267 static void rc_throttle(struct tty_struct *tty)
1268 {
1269 struct riscom_port *port = tty->driver_data;
1270 struct riscom_board *bp;
1271 unsigned long flags;
1272
1273 if (rc_paranoia_check(port, tty->name, "rc_throttle"))
1274 return;
1275 bp = port_Board(port);
1276
1277 spin_lock_irqsave(&riscom_lock, flags);
1278 port->MSVR &= ~MSVR_RTS;
1279 rc_out(bp, CD180_CAR, port_No(port));
1280 if (I_IXOFF(tty)) {
1281 rc_wait_CCR(bp);
1282 rc_out(bp, CD180_CCR, CCR_SSCH2);
1283 rc_wait_CCR(bp);
1284 }
1285 rc_out(bp, CD180_MSVR, port->MSVR);
1286 spin_unlock_irqrestore(&riscom_lock, flags);
1287 }
1288
1289 static void rc_unthrottle(struct tty_struct *tty)
1290 {
1291 struct riscom_port *port = tty->driver_data;
1292 struct riscom_board *bp;
1293 unsigned long flags;
1294
1295 if (rc_paranoia_check(port, tty->name, "rc_unthrottle"))
1296 return;
1297 bp = port_Board(port);
1298
1299 spin_lock_irqsave(&riscom_lock, flags);
1300 port->MSVR |= MSVR_RTS;
1301 rc_out(bp, CD180_CAR, port_No(port));
1302 if (I_IXOFF(tty)) {
1303 rc_wait_CCR(bp);
1304 rc_out(bp, CD180_CCR, CCR_SSCH1);
1305 rc_wait_CCR(bp);
1306 }
1307 rc_out(bp, CD180_MSVR, port->MSVR);
1308 spin_unlock_irqrestore(&riscom_lock, flags);
1309 }
1310
1311 static void rc_stop(struct tty_struct *tty)
1312 {
1313 struct riscom_port *port = tty->driver_data;
1314 struct riscom_board *bp;
1315 unsigned long flags;
1316
1317 if (rc_paranoia_check(port, tty->name, "rc_stop"))
1318 return;
1319
1320 bp = port_Board(port);
1321
1322 spin_lock_irqsave(&riscom_lock, flags);
1323 port->IER &= ~IER_TXRDY;
1324 rc_out(bp, CD180_CAR, port_No(port));
1325 rc_out(bp, CD180_IER, port->IER);
1326 spin_unlock_irqrestore(&riscom_lock, flags);
1327 }
1328
1329 static void rc_start(struct tty_struct *tty)
1330 {
1331 struct riscom_port *port = tty->driver_data;
1332 struct riscom_board *bp;
1333 unsigned long flags;
1334
1335 if (rc_paranoia_check(port, tty->name, "rc_start"))
1336 return;
1337
1338 bp = port_Board(port);
1339
1340 spin_lock_irqsave(&riscom_lock, flags);
1341
1342 if (port->xmit_cnt && port->port.xmit_buf && !(port->IER & IER_TXRDY)) {
1343 port->IER |= IER_TXRDY;
1344 rc_out(bp, CD180_CAR, port_No(port));
1345 rc_out(bp, CD180_IER, port->IER);
1346 }
1347 spin_unlock_irqrestore(&riscom_lock, flags);
1348 }
1349
1350 static void rc_hangup(struct tty_struct *tty)
1351 {
1352 struct riscom_port *port = tty->driver_data;
1353 struct riscom_board *bp;
1354 unsigned long flags;
1355
1356 if (rc_paranoia_check(port, tty->name, "rc_hangup"))
1357 return;
1358
1359 bp = port_Board(port);
1360
1361 rc_shutdown_port(tty, bp, port);
1362 spin_lock_irqsave(&port->port.lock, flags);
1363 port->port.count = 0;
1364 port->port.flags &= ~ASYNC_NORMAL_ACTIVE;
1365 port->port.tty = NULL;
1366 wake_up_interruptible(&port->port.open_wait);
1367 spin_unlock_irqrestore(&port->port.lock, flags);
1368 }
1369
1370 static void rc_set_termios(struct tty_struct *tty,
1371 struct ktermios *old_termios)
1372 {
1373 struct riscom_port *port = tty->driver_data;
1374 unsigned long flags;
1375
1376 if (rc_paranoia_check(port, tty->name, "rc_set_termios"))
1377 return;
1378
1379 spin_lock_irqsave(&riscom_lock, flags);
1380 rc_change_speed(port_Board(port), port);
1381 spin_unlock_irqrestore(&riscom_lock, flags);
1382
1383 if ((old_termios->c_cflag & CRTSCTS) &&
1384 !(tty->termios->c_cflag & CRTSCTS)) {
1385 tty->hw_stopped = 0;
1386 rc_start(tty);
1387 }
1388 }
1389
1390 static const struct tty_operations riscom_ops = {
1391 .open = rc_open,
1392 .close = rc_close,
1393 .write = rc_write,
1394 .put_char = rc_put_char,
1395 .flush_chars = rc_flush_chars,
1396 .write_room = rc_write_room,
1397 .chars_in_buffer = rc_chars_in_buffer,
1398 .flush_buffer = rc_flush_buffer,
1399 .ioctl = rc_ioctl,
1400 .throttle = rc_throttle,
1401 .unthrottle = rc_unthrottle,
1402 .set_termios = rc_set_termios,
1403 .stop = rc_stop,
1404 .start = rc_start,
1405 .hangup = rc_hangup,
1406 .tiocmget = rc_tiocmget,
1407 .tiocmset = rc_tiocmset,
1408 .break_ctl = rc_send_break,
1409 };
1410
1411 static const struct tty_port_operations riscom_port_ops = {
1412 .carrier_raised = carrier_raised,
1413 };
1414
1415
1416 static int __init rc_init_drivers(void)
1417 {
1418 int error;
1419 int i;
1420
1421 riscom_driver = alloc_tty_driver(RC_NBOARD * RC_NPORT);
1422 if (!riscom_driver)
1423 return -ENOMEM;
1424
1425 riscom_driver->owner = THIS_MODULE;
1426 riscom_driver->name = "ttyL";
1427 riscom_driver->major = RISCOM8_NORMAL_MAJOR;
1428 riscom_driver->type = TTY_DRIVER_TYPE_SERIAL;
1429 riscom_driver->subtype = SERIAL_TYPE_NORMAL;
1430 riscom_driver->init_termios = tty_std_termios;
1431 riscom_driver->init_termios.c_cflag =
1432 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1433 riscom_driver->init_termios.c_ispeed = 9600;
1434 riscom_driver->init_termios.c_ospeed = 9600;
1435 riscom_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_HARDWARE_BREAK;
1436 tty_set_operations(riscom_driver, &riscom_ops);
1437 error = tty_register_driver(riscom_driver);
1438 if (error != 0) {
1439 put_tty_driver(riscom_driver);
1440 printk(KERN_ERR "rc: Couldn't register RISCom/8 driver, "
1441 "error = %d\n", error);
1442 return 1;
1443 }
1444 memset(rc_port, 0, sizeof(rc_port));
1445 for (i = 0; i < RC_NPORT * RC_NBOARD; i++) {
1446 tty_port_init(&rc_port[i].port);
1447 rc_port[i].port.ops = &riscom_port_ops;
1448 rc_port[i].magic = RISCOM8_MAGIC;
1449 }
1450 return 0;
1451 }
1452
1453 static void rc_release_drivers(void)
1454 {
1455 tty_unregister_driver(riscom_driver);
1456 put_tty_driver(riscom_driver);
1457 }
1458
1459 #ifndef MODULE
1460 /*
1461 * Called at boot time.
1462 *
1463 * You can specify IO base for up to RC_NBOARD cards,
1464 * using line "riscom8=0xiobase1,0xiobase2,.." at LILO prompt.
1465 * Note that there will be no probing at default
1466 * addresses in this case.
1467 *
1468 */
1469 static int __init riscom8_setup(char *str)
1470 {
1471 int ints[RC_NBOARD];
1472 int i;
1473
1474 str = get_options(str, ARRAY_SIZE(ints), ints);
1475
1476 for (i = 0; i < RC_NBOARD; i++) {
1477 if (i < ints[0])
1478 rc_board[i].base = ints[i+1];
1479 else
1480 rc_board[i].base = 0;
1481 }
1482 return 1;
1483 }
1484
1485 __setup("riscom8=", riscom8_setup);
1486 #endif
1487
1488 static char banner[] __initdata =
1489 KERN_INFO "rc: SDL RISCom/8 card driver v1.1, (c) D.Gorodchanin "
1490 "1994-1996.\n";
1491 static char no_boards_msg[] __initdata =
1492 KERN_INFO "rc: No RISCom/8 boards detected.\n";
1493
1494 /*
1495 * This routine must be called by kernel at boot time
1496 */
1497 static int __init riscom8_init(void)
1498 {
1499 int i;
1500 int found = 0;
1501
1502 printk(banner);
1503
1504 if (rc_init_drivers())
1505 return -EIO;
1506
1507 for (i = 0; i < RC_NBOARD; i++)
1508 if (rc_board[i].base && !rc_probe(&rc_board[i]))
1509 found++;
1510 if (!found) {
1511 rc_release_drivers();
1512 printk(no_boards_msg);
1513 return -EIO;
1514 }
1515 return 0;
1516 }
1517
1518 #ifdef MODULE
1519 static int iobase;
1520 static int iobase1;
1521 static int iobase2;
1522 static int iobase3;
1523 module_param(iobase, int, 0);
1524 module_param(iobase1, int, 0);
1525 module_param(iobase2, int, 0);
1526 module_param(iobase3, int, 0);
1527
1528 MODULE_LICENSE("GPL");
1529 MODULE_ALIAS_CHARDEV_MAJOR(RISCOM8_NORMAL_MAJOR);
1530 #endif /* MODULE */
1531
1532 /*
1533 * You can setup up to 4 boards (current value of RC_NBOARD)
1534 * by specifying "iobase=0xXXX iobase1=0xXXX ..." as insmod parameter.
1535 *
1536 */
1537 static int __init riscom8_init_module(void)
1538 {
1539 #ifdef MODULE
1540 int i;
1541
1542 if (iobase || iobase1 || iobase2 || iobase3) {
1543 for (i = 0; i < RC_NBOARD; i++)
1544 rc_board[i].base = 0;
1545 }
1546
1547 if (iobase)
1548 rc_board[0].base = iobase;
1549 if (iobase1)
1550 rc_board[1].base = iobase1;
1551 if (iobase2)
1552 rc_board[2].base = iobase2;
1553 if (iobase3)
1554 rc_board[3].base = iobase3;
1555 #endif /* MODULE */
1556
1557 return riscom8_init();
1558 }
1559
1560 static void __exit riscom8_exit_module(void)
1561 {
1562 int i;
1563
1564 rc_release_drivers();
1565 for (i = 0; i < RC_NBOARD; i++)
1566 if (rc_board[i].flags & RC_BOARD_PRESENT)
1567 rc_release_io_range(&rc_board[i]);
1568
1569 }
1570
1571 module_init(riscom8_init_module);
1572 module_exit(riscom8_exit_module);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree