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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / drivers / char / riscom8.c
blob55a3a0188eda09084f5e1056451162f7d8f85fc5
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 <asm/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
50 #include <asm/uaccess.h>
51
52 #include "riscom8.h"
53 #include "riscom8_reg.h"
54
55 /* Am I paranoid or not ? ;-) */
56 #define RISCOM_PARANOIA_CHECK
57
58 /*
59 * Crazy InteliCom/8 boards sometimes has swapped CTS & DSR signals.
60 * You can slightly speed up things by #undefing the following option,
61 * if you are REALLY sure that your board is correct one.
62 */
63
64 #define RISCOM_BRAIN_DAMAGED_CTS
65
66 /*
67 * The following defines are mostly for testing purposes. But if you need
68 * some nice reporting in your syslog, you can define them also.
69 */
70 #undef RC_REPORT_FIFO
71 #undef RC_REPORT_OVERRUN
72
73
74 #define RISCOM_LEGAL_FLAGS \
75 (ASYNC_HUP_NOTIFY | ASYNC_SAK | ASYNC_SPLIT_TERMIOS | \
76 ASYNC_SPD_HI | ASYNC_SPEED_VHI | ASYNC_SESSION_LOCKOUT | \
77 ASYNC_PGRP_LOCKOUT | ASYNC_CALLOUT_NOHUP)
78
79 #define RS_EVENT_WRITE_WAKEUP 0
80
81 static struct riscom_board * IRQ_to_board[16];
82 static struct tty_driver *riscom_driver;
83 static unsigned char * tmp_buf;
84 static DECLARE_MUTEX(tmp_buf_sem);
85
86 static unsigned long baud_table[] = {
87 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
88 9600, 19200, 38400, 57600, 76800, 0,
89 };
90
91 static struct riscom_board rc_board[RC_NBOARD] = {
92 {
93 .base = RC_IOBASE1,
94 },
95 {
96 .base = RC_IOBASE2,
97 },
98 {
99 .base = RC_IOBASE3,
100 },
101 {
102 .base = RC_IOBASE4,
103 },
104 };
105
106 static struct riscom_port rc_port[RC_NBOARD * RC_NPORT];
107
108 /* RISCom/8 I/O ports addresses (without address translation) */
109 static unsigned short rc_ioport[] = {
110 #if 1
111 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0c,
112 #else
113 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0c, 0x10,
114 0x11, 0x12, 0x18, 0x28, 0x31, 0x32, 0x39, 0x3a, 0x40, 0x41, 0x61, 0x62,
115 0x63, 0x64, 0x6b, 0x70, 0x71, 0x78, 0x7a, 0x7b, 0x7f, 0x100, 0x101
116 #endif
117 };
118 #define RC_NIOPORT (sizeof(rc_ioport) / sizeof(rc_ioport[0]))
119
120
121 static inline int rc_paranoia_check(struct riscom_port const * port,
122 char *name, const char *routine)
123 {
124 #ifdef RISCOM_PARANOIA_CHECK
125 static const char badmagic[] = KERN_INFO
126 "rc: Warning: bad riscom port magic number for device %s in %s\n";
127 static const char badinfo[] = KERN_INFO
128 "rc: Warning: null riscom port for device %s in %s\n";
129
130 if (!port) {
131 printk(badinfo, name, routine);
132 return 1;
133 }
134 if (port->magic != RISCOM8_MAGIC) {
135 printk(badmagic, name, routine);
136 return 1;
137 }
138 #endif
139 return 0;
140 }
141
142 /*
143 *
144 * Service functions for RISCom/8 driver.
145 *
146 */
147
148 /* Get board number from pointer */
149 static inline int board_No (struct riscom_board const * bp)
150 {
151 return bp - rc_board;
152 }
153
154 /* Get port number from pointer */
155 static inline int port_No (struct riscom_port const * port)
156 {
157 return RC_PORT(port - rc_port);
158 }
159
160 /* Get pointer to board from pointer to port */
161 static inline struct riscom_board * port_Board(struct riscom_port const * port)
162 {
163 return &rc_board[RC_BOARD(port - rc_port)];
164 }
165
166 /* Input Byte from CL CD180 register */
167 static inline unsigned char rc_in(struct riscom_board const * bp, unsigned short reg)
168 {
169 return inb(bp->base + RC_TO_ISA(reg));
170 }
171
172 /* Output Byte to CL CD180 register */
173 static inline void rc_out(struct riscom_board const * bp, unsigned short reg,
174 unsigned char val)
175 {
176 outb(val, bp->base + RC_TO_ISA(reg));
177 }
178
179 /* Wait for Channel Command Register ready */
180 static inline void rc_wait_CCR(struct riscom_board const * bp)
181 {
182 unsigned long delay;
183
184 /* FIXME: need something more descriptive then 100000 :) */
185 for (delay = 100000; delay; delay--)
186 if (!rc_in(bp, CD180_CCR))
187 return;
188
189 printk(KERN_INFO "rc%d: Timeout waiting for CCR.\n", board_No(bp));
190 }
191
192 /*
193 * RISCom/8 probe functions.
194 */
195
196 static inline int rc_request_io_range(struct riscom_board * const bp)
197 {
198 int i;
199
200 for (i = 0; i < RC_NIOPORT; i++)
201 if (!request_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1,
202 "RISCom/8")) {
203 goto out_release;
204 }
205 return 0;
206 out_release:
207 printk(KERN_INFO "rc%d: Skipping probe at 0x%03x. IO address in use.\n",
208 board_No(bp), bp->base);
209 while(--i >= 0)
210 release_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1);
211 return 1;
212 }
213
214 static inline void rc_release_io_range(struct riscom_board * const bp)
215 {
216 int i;
217
218 for (i = 0; i < RC_NIOPORT; i++)
219 release_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1);
220 }
221
222 /* Must be called with enabled interrupts */
223 static inline void rc_long_delay(unsigned long delay)
224 {
225 unsigned long i;
226
227 for (i = jiffies + delay; time_after(i,jiffies); ) ;
228 }
229
230 /* Reset and setup CD180 chip */
231 static void __init rc_init_CD180(struct riscom_board const * bp)
232 {
233 unsigned long flags;
234
235 save_flags(flags); cli();
236 rc_out(bp, RC_CTOUT, 0); /* Clear timeout */
237 rc_wait_CCR(bp); /* Wait for CCR ready */
238 rc_out(bp, CD180_CCR, CCR_HARDRESET); /* Reset CD180 chip */
239 sti();
240 rc_long_delay(HZ/20); /* Delay 0.05 sec */
241 cli();
242 rc_out(bp, CD180_GIVR, RC_ID); /* Set ID for this chip */
243 rc_out(bp, CD180_GICR, 0); /* Clear all bits */
244 rc_out(bp, CD180_PILR1, RC_ACK_MINT); /* Prio for modem intr */
245 rc_out(bp, CD180_PILR2, RC_ACK_TINT); /* Prio for transmitter intr */
246 rc_out(bp, CD180_PILR3, RC_ACK_RINT); /* Prio for receiver intr */
247
248 /* Setting up prescaler. We need 4 ticks per 1 ms */
249 rc_out(bp, CD180_PPRH, (RC_OSCFREQ/(1000000/RISCOM_TPS)) >> 8);
250 rc_out(bp, CD180_PPRL, (RC_OSCFREQ/(1000000/RISCOM_TPS)) & 0xff);
251
252 restore_flags(flags);
253 }
254
255 /* Main probing routine, also sets irq. */
256 static int __init rc_probe(struct riscom_board *bp)
257 {
258 unsigned char val1, val2;
259 int irqs = 0;
260 int retries;
261
262 bp->irq = 0;
263
264 if (rc_request_io_range(bp))
265 return 1;
266
267 /* Are the I/O ports here ? */
268 rc_out(bp, CD180_PPRL, 0x5a);
269 outb(0xff, 0x80);
270 val1 = rc_in(bp, CD180_PPRL);
271 rc_out(bp, CD180_PPRL, 0xa5);
272 outb(0x00, 0x80);
273 val2 = rc_in(bp, CD180_PPRL);
274
275 if ((val1 != 0x5a) || (val2 != 0xa5)) {
276 printk(KERN_ERR "rc%d: RISCom/8 Board at 0x%03x not found.\n",
277 board_No(bp), bp->base);
278 goto out_release;
279 }
280
281 /* It's time to find IRQ for this board */
282 for (retries = 0; retries < 5 && irqs <= 0; retries++) {
283 irqs = probe_irq_on();
284 rc_init_CD180(bp); /* Reset CD180 chip */
285 rc_out(bp, CD180_CAR, 2); /* Select port 2 */
286 rc_wait_CCR(bp);
287 rc_out(bp, CD180_CCR, CCR_TXEN); /* Enable transmitter */
288 rc_out(bp, CD180_IER, IER_TXRDY); /* Enable tx empty intr */
289 rc_long_delay(HZ/20);
290 irqs = probe_irq_off(irqs);
291 val1 = rc_in(bp, RC_BSR); /* Get Board Status reg */
292 val2 = rc_in(bp, RC_ACK_TINT); /* ACK interrupt */
293 rc_init_CD180(bp); /* Reset CD180 again */
294
295 if ((val1 & RC_BSR_TINT) || (val2 != (RC_ID | GIVR_IT_TX))) {
296 printk(KERN_ERR "rc%d: RISCom/8 Board at 0x%03x not "
297 "found.\n", board_No(bp), bp->base);
298 goto out_release;
299 }
300 }
301
302 if (irqs <= 0) {
303 printk(KERN_ERR "rc%d: Can't find IRQ for RISCom/8 board "
304 "at 0x%03x.\n", board_No(bp), bp->base);
305 goto out_release;
306 }
307 bp->irq = irqs;
308 bp->flags |= RC_BOARD_PRESENT;
309
310 printk(KERN_INFO "rc%d: RISCom/8 Rev. %c board detected at "
311 "0x%03x, IRQ %d.\n",
312 board_No(bp),
313 (rc_in(bp, CD180_GFRCR) & 0x0f) + 'A', /* Board revision */
314 bp->base, bp->irq);
315
316 return 0;
317 out_release:
318 rc_release_io_range(bp);
319 return 1;
320 }
321
322 /*
323 *
324 * Interrupt processing routines.
325 *
326 */
327
328 static inline void rc_mark_event(struct riscom_port * port, int event)
329 {
330 set_bit(event, &port->event);
331 schedule_work(&port->tqueue);
332 }
333
334 static inline struct riscom_port * rc_get_port(struct riscom_board const * bp,
335 unsigned char const * what)
336 {
337 unsigned char channel;
338 struct riscom_port * port;
339
340 channel = rc_in(bp, CD180_GICR) >> GICR_CHAN_OFF;
341 if (channel < CD180_NCH) {
342 port = &rc_port[board_No(bp) * RC_NPORT + channel];
343 if (port->flags & ASYNC_INITIALIZED) {
344 return port;
345 }
346 }
347 printk(KERN_ERR "rc%d: %s interrupt from invalid port %d\n",
348 board_No(bp), what, channel);
349 return NULL;
350 }
351
352 static inline void rc_receive_exc(struct riscom_board const * bp)
353 {
354 struct riscom_port *port;
355 struct tty_struct *tty;
356 unsigned char status;
357 unsigned char ch;
358
359 if (!(port = rc_get_port(bp, "Receive")))
360 return;
361
362 tty = port->tty;
363 if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
364 printk(KERN_WARNING "rc%d: port %d: Working around flip "
365 "buffer overflow.\n",
366 board_No(bp), port_No(port));
367 return;
368 }
369
370 #ifdef RC_REPORT_OVERRUN
371 status = rc_in(bp, CD180_RCSR);
372 if (status & RCSR_OE) {
373 port->overrun++;
374 #if 0
375 printk(KERN_ERR "rc%d: port %d: Overrun. Total %ld overruns\n",
376 board_No(bp), port_No(port), port->overrun);
377 #endif
378 }
379 status &= port->mark_mask;
380 #else
381 status = rc_in(bp, CD180_RCSR) & port->mark_mask;
382 #endif
383 ch = rc_in(bp, CD180_RDR);
384 if (!status) {
385 return;
386 }
387 if (status & RCSR_TOUT) {
388 printk(KERN_WARNING "rc%d: port %d: Receiver timeout. "
389 "Hardware problems ?\n",
390 board_No(bp), port_No(port));
391 return;
392
393 } else if (status & RCSR_BREAK) {
394 printk(KERN_INFO "rc%d: port %d: Handling break...\n",
395 board_No(bp), port_No(port));
396 *tty->flip.flag_buf_ptr++ = TTY_BREAK;
397 if (port->flags & ASYNC_SAK)
398 do_SAK(tty);
399
400 } else if (status & RCSR_PE)
401 *tty->flip.flag_buf_ptr++ = TTY_PARITY;
402
403 else if (status & RCSR_FE)
404 *tty->flip.flag_buf_ptr++ = TTY_FRAME;
405
406 else if (status & RCSR_OE)
407 *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
408
409 else
410 *tty->flip.flag_buf_ptr++ = 0;
411
412 *tty->flip.char_buf_ptr++ = ch;
413 tty->flip.count++;
414 schedule_delayed_work(&tty->flip.work, 1);
415 }
416
417 static inline void rc_receive(struct riscom_board const * bp)
418 {
419 struct riscom_port *port;
420 struct tty_struct *tty;
421 unsigned char count;
422
423 if (!(port = rc_get_port(bp, "Receive")))
424 return;
425
426 tty = port->tty;
427
428 count = rc_in(bp, CD180_RDCR);
429
430 #ifdef RC_REPORT_FIFO
431 port->hits[count > 8 ? 9 : count]++;
432 #endif
433
434 while (count--) {
435 if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
436 printk(KERN_WARNING "rc%d: port %d: Working around "
437 "flip buffer overflow.\n",
438 board_No(bp), port_No(port));
439 break;
440 }
441 *tty->flip.char_buf_ptr++ = rc_in(bp, CD180_RDR);
442 *tty->flip.flag_buf_ptr++ = 0;
443 tty->flip.count++;
444 }
445 schedule_delayed_work(&tty->flip.work, 1);
446 }
447
448 static inline void rc_transmit(struct riscom_board const * bp)
449 {
450 struct riscom_port *port;
451 struct tty_struct *tty;
452 unsigned char count;
453
454
455 if (!(port = rc_get_port(bp, "Transmit")))
456 return;
457
458 tty = port->tty;
459
460 if (port->IER & IER_TXEMPTY) {
461 /* FIFO drained */
462 rc_out(bp, CD180_CAR, port_No(port));
463 port->IER &= ~IER_TXEMPTY;
464 rc_out(bp, CD180_IER, port->IER);
465 return;
466 }
467
468 if ((port->xmit_cnt <= 0 && !port->break_length)
469 || tty->stopped || tty->hw_stopped) {
470 rc_out(bp, CD180_CAR, port_No(port));
471 port->IER &= ~IER_TXRDY;
472 rc_out(bp, CD180_IER, port->IER);
473 return;
474 }
475
476 if (port->break_length) {
477 if (port->break_length > 0) {
478 if (port->COR2 & COR2_ETC) {
479 rc_out(bp, CD180_TDR, CD180_C_ESC);
480 rc_out(bp, CD180_TDR, CD180_C_SBRK);
481 port->COR2 &= ~COR2_ETC;
482 }
483 count = min_t(int, port->break_length, 0xff);
484 rc_out(bp, CD180_TDR, CD180_C_ESC);
485 rc_out(bp, CD180_TDR, CD180_C_DELAY);
486 rc_out(bp, CD180_TDR, count);
487 if (!(port->break_length -= count))
488 port->break_length--;
489 } else {
490 rc_out(bp, CD180_TDR, CD180_C_ESC);
491 rc_out(bp, CD180_TDR, CD180_C_EBRK);
492 rc_out(bp, CD180_COR2, port->COR2);
493 rc_wait_CCR(bp);
494 rc_out(bp, CD180_CCR, CCR_CORCHG2);
495 port->break_length = 0;
496 }
497 return;
498 }
499
500 count = CD180_NFIFO;
501 do {
502 rc_out(bp, CD180_TDR, port->xmit_buf[port->xmit_tail++]);
503 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE-1);
504 if (--port->xmit_cnt <= 0)
505 break;
506 } while (--count > 0);
507
508 if (port->xmit_cnt <= 0) {
509 rc_out(bp, CD180_CAR, port_No(port));
510 port->IER &= ~IER_TXRDY;
511 rc_out(bp, CD180_IER, port->IER);
512 }
513 if (port->xmit_cnt <= port->wakeup_chars)
514 rc_mark_event(port, RS_EVENT_WRITE_WAKEUP);
515 }
516
517 static inline void rc_check_modem(struct riscom_board const * bp)
518 {
519 struct riscom_port *port;
520 struct tty_struct *tty;
521 unsigned char mcr;
522
523 if (!(port = rc_get_port(bp, "Modem")))
524 return;
525
526 tty = port->tty;
527
528 mcr = rc_in(bp, CD180_MCR);
529 if (mcr & MCR_CDCHG) {
530 if (rc_in(bp, CD180_MSVR) & MSVR_CD)
531 wake_up_interruptible(&port->open_wait);
532 else
533 schedule_work(&port->tqueue_hangup);
534 }
535
536 #ifdef RISCOM_BRAIN_DAMAGED_CTS
537 if (mcr & MCR_CTSCHG) {
538 if (rc_in(bp, CD180_MSVR) & MSVR_CTS) {
539 tty->hw_stopped = 0;
540 port->IER |= IER_TXRDY;
541 if (port->xmit_cnt <= port->wakeup_chars)
542 rc_mark_event(port, RS_EVENT_WRITE_WAKEUP);
543 } else {
544 tty->hw_stopped = 1;
545 port->IER &= ~IER_TXRDY;
546 }
547 rc_out(bp, CD180_IER, port->IER);
548 }
549 if (mcr & MCR_DSRCHG) {
550 if (rc_in(bp, CD180_MSVR) & MSVR_DSR) {
551 tty->hw_stopped = 0;
552 port->IER |= IER_TXRDY;
553 if (port->xmit_cnt <= port->wakeup_chars)
554 rc_mark_event(port, RS_EVENT_WRITE_WAKEUP);
555 } else {
556 tty->hw_stopped = 1;
557 port->IER &= ~IER_TXRDY;
558 }
559 rc_out(bp, CD180_IER, port->IER);
560 }
561 #endif /* RISCOM_BRAIN_DAMAGED_CTS */
562
563 /* Clear change bits */
564 rc_out(bp, CD180_MCR, 0);
565 }
566
567 /* The main interrupt processing routine */
568 static irqreturn_t rc_interrupt(int irq, void * dev_id, struct pt_regs * regs)
569 {
570 unsigned char status;
571 unsigned char ack;
572 struct riscom_board *bp;
573 unsigned long loop = 0;
574 int handled = 0;
575
576 bp = IRQ_to_board[irq];
577
578 if (!bp || !(bp->flags & RC_BOARD_ACTIVE)) {
579 return IRQ_NONE;
580 }
581
582 while ((++loop < 16) && ((status = ~(rc_in(bp, RC_BSR))) &
583 (RC_BSR_TOUT | RC_BSR_TINT |
584 RC_BSR_MINT | RC_BSR_RINT))) {
585 handled = 1;
586 if (status & RC_BSR_TOUT)
587 printk(KERN_WARNING "rc%d: Got timeout. Hardware "
588 "error?\n", board_No(bp));
589
590 else if (status & RC_BSR_RINT) {
591 ack = rc_in(bp, RC_ACK_RINT);
592
593 if (ack == (RC_ID | GIVR_IT_RCV))
594 rc_receive(bp);
595 else if (ack == (RC_ID | GIVR_IT_REXC))
596 rc_receive_exc(bp);
597 else
598 printk(KERN_WARNING "rc%d: Bad receive ack "
599 "0x%02x.\n",
600 board_No(bp), ack);
601
602 } else if (status & RC_BSR_TINT) {
603 ack = rc_in(bp, RC_ACK_TINT);
604
605 if (ack == (RC_ID | GIVR_IT_TX))
606 rc_transmit(bp);
607 else
608 printk(KERN_WARNING "rc%d: Bad transmit ack "
609 "0x%02x.\n",
610 board_No(bp), ack);
611
612 } else /* if (status & RC_BSR_MINT) */ {
613 ack = rc_in(bp, RC_ACK_MINT);
614
615 if (ack == (RC_ID | GIVR_IT_MODEM))
616 rc_check_modem(bp);
617 else
618 printk(KERN_WARNING "rc%d: Bad modem ack "
619 "0x%02x.\n",
620 board_No(bp), ack);
621
622 }
623
624 rc_out(bp, CD180_EOIR, 0); /* Mark end of interrupt */
625 rc_out(bp, RC_CTOUT, 0); /* Clear timeout flag */
626 }
627 return IRQ_RETVAL(handled);
628 }
629
630 /*
631 * Routines for open & close processing.
632 */
633
634 /* Called with disabled interrupts */
635 static inline int rc_setup_board(struct riscom_board * bp)
636 {
637 int error;
638
639 if (bp->flags & RC_BOARD_ACTIVE)
640 return 0;
641
642 error = request_irq(bp->irq, rc_interrupt, SA_INTERRUPT,
643 "RISCom/8", NULL);
644 if (error)
645 return error;
646
647 rc_out(bp, RC_CTOUT, 0); /* Just in case */
648 bp->DTR = ~0;
649 rc_out(bp, RC_DTR, bp->DTR); /* Drop DTR on all ports */
650
651 IRQ_to_board[bp->irq] = bp;
652 bp->flags |= RC_BOARD_ACTIVE;
653
654 return 0;
655 }
656
657 /* Called with disabled interrupts */
658 static inline void rc_shutdown_board(struct riscom_board *bp)
659 {
660 if (!(bp->flags & RC_BOARD_ACTIVE))
661 return;
662
663 bp->flags &= ~RC_BOARD_ACTIVE;
664
665 free_irq(bp->irq, NULL);
666 IRQ_to_board[bp->irq] = NULL;
667
668 bp->DTR = ~0;
669 rc_out(bp, RC_DTR, bp->DTR); /* Drop DTR on all ports */
670
671 }
672
673 /*
674 * Setting up port characteristics.
675 * Must be called with disabled interrupts
676 */
677 static void rc_change_speed(struct riscom_board *bp, struct riscom_port *port)
678 {
679 struct tty_struct *tty;
680 unsigned long baud;
681 long tmp;
682 unsigned char cor1 = 0, cor3 = 0;
683 unsigned char mcor1 = 0, mcor2 = 0;
684
685 if (!(tty = port->tty) || !tty->termios)
686 return;
687
688 port->IER = 0;
689 port->COR2 = 0;
690 port->MSVR = MSVR_RTS;
691
692 baud = C_BAUD(tty);
693
694 if (baud & CBAUDEX) {
695 baud &= ~CBAUDEX;
696 if (baud < 1 || baud > 2)
697 port->tty->termios->c_cflag &= ~CBAUDEX;
698 else
699 baud += 15;
700 }
701 if (baud == 15) {
702 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
703 baud ++;
704 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
705 baud += 2;
706 }
707
708 /* Select port on the board */
709 rc_out(bp, CD180_CAR, port_No(port));
710
711 if (!baud_table[baud]) {
712 /* Drop DTR & exit */
713 bp->DTR |= (1u << port_No(port));
714 rc_out(bp, RC_DTR, bp->DTR);
715 return;
716 } else {
717 /* Set DTR on */
718 bp->DTR &= ~(1u << port_No(port));
719 rc_out(bp, RC_DTR, bp->DTR);
720 }
721
722 /*
723 * Now we must calculate some speed depended things
724 */
725
726 /* Set baud rate for port */
727 tmp = (((RC_OSCFREQ + baud_table[baud]/2) / baud_table[baud] +
728 CD180_TPC/2) / CD180_TPC);
729
730 rc_out(bp, CD180_RBPRH, (tmp >> 8) & 0xff);
731 rc_out(bp, CD180_TBPRH, (tmp >> 8) & 0xff);
732 rc_out(bp, CD180_RBPRL, tmp & 0xff);
733 rc_out(bp, CD180_TBPRL, tmp & 0xff);
734
735 baud = (baud_table[baud] + 5) / 10; /* Estimated CPS */
736
737 /* Two timer ticks seems enough to wakeup something like SLIP driver */
738 tmp = ((baud + HZ/2) / HZ) * 2 - CD180_NFIFO;
739 port->wakeup_chars = (tmp < 0) ? 0 : ((tmp >= SERIAL_XMIT_SIZE) ?
740 SERIAL_XMIT_SIZE - 1 : tmp);
741
742 /* Receiver timeout will be transmission time for 1.5 chars */
743 tmp = (RISCOM_TPS + RISCOM_TPS/2 + baud/2) / baud;
744 tmp = (tmp > 0xff) ? 0xff : tmp;
745 rc_out(bp, CD180_RTPR, tmp);
746
747 switch (C_CSIZE(tty)) {
748 case CS5:
749 cor1 |= COR1_5BITS;
750 break;
751 case CS6:
752 cor1 |= COR1_6BITS;
753 break;
754 case CS7:
755 cor1 |= COR1_7BITS;
756 break;
757 case CS8:
758 cor1 |= COR1_8BITS;
759 break;
760 }
761
762 if (C_CSTOPB(tty))
763 cor1 |= COR1_2SB;
764
765 cor1 |= COR1_IGNORE;
766 if (C_PARENB(tty)) {
767 cor1 |= COR1_NORMPAR;
768 if (C_PARODD(tty))
769 cor1 |= COR1_ODDP;
770 if (I_INPCK(tty))
771 cor1 &= ~COR1_IGNORE;
772 }
773 /* Set marking of some errors */
774 port->mark_mask = RCSR_OE | RCSR_TOUT;
775 if (I_INPCK(tty))
776 port->mark_mask |= RCSR_FE | RCSR_PE;
777 if (I_BRKINT(tty) || I_PARMRK(tty))
778 port->mark_mask |= RCSR_BREAK;
779 if (I_IGNPAR(tty))
780 port->mark_mask &= ~(RCSR_FE | RCSR_PE);
781 if (I_IGNBRK(tty)) {
782 port->mark_mask &= ~RCSR_BREAK;
783 if (I_IGNPAR(tty))
784 /* Real raw mode. Ignore all */
785 port->mark_mask &= ~RCSR_OE;
786 }
787 /* Enable Hardware Flow Control */
788 if (C_CRTSCTS(tty)) {
789 #ifdef RISCOM_BRAIN_DAMAGED_CTS
790 port->IER |= IER_DSR | IER_CTS;
791 mcor1 |= MCOR1_DSRZD | MCOR1_CTSZD;
792 mcor2 |= MCOR2_DSROD | MCOR2_CTSOD;
793 tty->hw_stopped = !(rc_in(bp, CD180_MSVR) & (MSVR_CTS|MSVR_DSR));
794 #else
795 port->COR2 |= COR2_CTSAE;
796 #endif
797 }
798 /* Enable Software Flow Control. FIXME: I'm not sure about this */
799 /* Some people reported that it works, but I still doubt */
800 if (I_IXON(tty)) {
801 port->COR2 |= COR2_TXIBE;
802 cor3 |= (COR3_FCT | COR3_SCDE);
803 if (I_IXANY(tty))
804 port->COR2 |= COR2_IXM;
805 rc_out(bp, CD180_SCHR1, START_CHAR(tty));
806 rc_out(bp, CD180_SCHR2, STOP_CHAR(tty));
807 rc_out(bp, CD180_SCHR3, START_CHAR(tty));
808 rc_out(bp, CD180_SCHR4, STOP_CHAR(tty));
809 }
810 if (!C_CLOCAL(tty)) {
811 /* Enable CD check */
812 port->IER |= IER_CD;
813 mcor1 |= MCOR1_CDZD;
814 mcor2 |= MCOR2_CDOD;
815 }
816
817 if (C_CREAD(tty))
818 /* Enable receiver */
819 port->IER |= IER_RXD;
820
821 /* Set input FIFO size (1-8 bytes) */
822 cor3 |= RISCOM_RXFIFO;
823 /* Setting up CD180 channel registers */
824 rc_out(bp, CD180_COR1, cor1);
825 rc_out(bp, CD180_COR2, port->COR2);
826 rc_out(bp, CD180_COR3, cor3);
827 /* Make CD180 know about registers change */
828 rc_wait_CCR(bp);
829 rc_out(bp, CD180_CCR, CCR_CORCHG1 | CCR_CORCHG2 | CCR_CORCHG3);
830 /* Setting up modem option registers */
831 rc_out(bp, CD180_MCOR1, mcor1);
832 rc_out(bp, CD180_MCOR2, mcor2);
833 /* Enable CD180 transmitter & receiver */
834 rc_wait_CCR(bp);
835 rc_out(bp, CD180_CCR, CCR_TXEN | CCR_RXEN);
836 /* Enable interrupts */
837 rc_out(bp, CD180_IER, port->IER);
838 /* And finally set RTS on */
839 rc_out(bp, CD180_MSVR, port->MSVR);
840 }
841
842 /* Must be called with interrupts enabled */
843 static int rc_setup_port(struct riscom_board *bp, struct riscom_port *port)
844 {
845 unsigned long flags;
846
847 if (port->flags & ASYNC_INITIALIZED)
848 return 0;
849
850 if (!port->xmit_buf) {
851 /* We may sleep in get_zeroed_page() */
852 unsigned long tmp;
853
854 if (!(tmp = get_zeroed_page(GFP_KERNEL)))
855 return -ENOMEM;
856
857 if (port->xmit_buf) {
858 free_page(tmp);
859 return -ERESTARTSYS;
860 }
861 port->xmit_buf = (unsigned char *) tmp;
862 }
863
864 save_flags(flags); cli();
865
866 if (port->tty)
867 clear_bit(TTY_IO_ERROR, &port->tty->flags);
868
869 if (port->count == 1)
870 bp->count++;
871
872 port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
873 rc_change_speed(bp, port);
874 port->flags |= ASYNC_INITIALIZED;
875
876 restore_flags(flags);
877 return 0;
878 }
879
880 /* Must be called with interrupts disabled */
881 static void rc_shutdown_port(struct riscom_board *bp, struct riscom_port *port)
882 {
883 struct tty_struct *tty;
884
885 if (!(port->flags & ASYNC_INITIALIZED))
886 return;
887
888 #ifdef RC_REPORT_OVERRUN
889 printk(KERN_INFO "rc%d: port %d: Total %ld overruns were detected.\n",
890 board_No(bp), port_No(port), port->overrun);
891 #endif
892 #ifdef RC_REPORT_FIFO
893 {
894 int i;
895
896 printk(KERN_INFO "rc%d: port %d: FIFO hits [ ",
897 board_No(bp), port_No(port));
898 for (i = 0; i < 10; i++) {
899 printk("%ld ", port->hits[i]);
900 }
901 printk("].\n");
902 }
903 #endif
904 if (port->xmit_buf) {
905 free_page((unsigned long) port->xmit_buf);
906 port->xmit_buf = NULL;
907 }
908
909 if (!(tty = port->tty) || C_HUPCL(tty)) {
910 /* Drop DTR */
911 bp->DTR |= (1u << port_No(port));
912 rc_out(bp, RC_DTR, bp->DTR);
913 }
914
915 /* Select port */
916 rc_out(bp, CD180_CAR, port_No(port));
917 /* Reset port */
918 rc_wait_CCR(bp);
919 rc_out(bp, CD180_CCR, CCR_SOFTRESET);
920 /* Disable all interrupts from this port */
921 port->IER = 0;
922 rc_out(bp, CD180_IER, port->IER);
923
924 if (tty)
925 set_bit(TTY_IO_ERROR, &tty->flags);
926 port->flags &= ~ASYNC_INITIALIZED;
927
928 if (--bp->count < 0) {
929 printk(KERN_INFO "rc%d: rc_shutdown_port: "
930 "bad board count: %d\n",
931 board_No(bp), bp->count);
932 bp->count = 0;
933 }
934
935 /*
936 * If this is the last opened port on the board
937 * shutdown whole board
938 */
939 if (!bp->count)
940 rc_shutdown_board(bp);
941 }
942
943
944 static int block_til_ready(struct tty_struct *tty, struct file * filp,
945 struct riscom_port *port)
946 {
947 DECLARE_WAITQUEUE(wait, current);
948 struct riscom_board *bp = port_Board(port);
949 int retval;
950 int do_clocal = 0;
951 int CD;
952
953 /*
954 * If the device is in the middle of being closed, then block
955 * until it's done, and then try again.
956 */
957 if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
958 interruptible_sleep_on(&port->close_wait);
959 if (port->flags & ASYNC_HUP_NOTIFY)
960 return -EAGAIN;
961 else
962 return -ERESTARTSYS;
963 }
964
965 /*
966 * If non-blocking mode is set, or the port is not enabled,
967 * then make the check up front and then exit.
968 */
969 if ((filp->f_flags & O_NONBLOCK) ||
970 (tty->flags & (1 << TTY_IO_ERROR))) {
971 port->flags |= ASYNC_NORMAL_ACTIVE;
972 return 0;
973 }
974
975 if (C_CLOCAL(tty))
976 do_clocal = 1;
977
978 /*
979 * Block waiting for the carrier detect and the line to become
980 * free (i.e., not in use by the callout). While we are in
981 * this loop, info->count is dropped by one, so that
982 * rs_close() knows when to free things. We restore it upon
983 * exit, either normal or abnormal.
984 */
985 retval = 0;
986 add_wait_queue(&port->open_wait, &wait);
987 cli();
988 if (!tty_hung_up_p(filp))
989 port->count--;
990 sti();
991 port->blocked_open++;
992 while (1) {
993 cli();
994 rc_out(bp, CD180_CAR, port_No(port));
995 CD = rc_in(bp, CD180_MSVR) & MSVR_CD;
996 rc_out(bp, CD180_MSVR, MSVR_RTS);
997 bp->DTR &= ~(1u << port_No(port));
998 rc_out(bp, RC_DTR, bp->DTR);
999 sti();
1000 set_current_state(TASK_INTERRUPTIBLE);
1001 if (tty_hung_up_p(filp) ||
1002 !(port->flags & ASYNC_INITIALIZED)) {
1003 if (port->flags & ASYNC_HUP_NOTIFY)
1004 retval = -EAGAIN;
1005 else
1006 retval = -ERESTARTSYS;
1007 break;
1008 }
1009 if (!(port->flags & ASYNC_CLOSING) &&
1010 (do_clocal || CD))
1011 break;
1012 if (signal_pending(current)) {
1013 retval = -ERESTARTSYS;
1014 break;
1015 }
1016 schedule();
1017 }
1018 current->state = TASK_RUNNING;
1019 remove_wait_queue(&port->open_wait, &wait);
1020 if (!tty_hung_up_p(filp))
1021 port->count++;
1022 port->blocked_open--;
1023 if (retval)
1024 return retval;
1025
1026 port->flags |= ASYNC_NORMAL_ACTIVE;
1027 return 0;
1028 }
1029
1030 static int rc_open(struct tty_struct * tty, struct file * filp)
1031 {
1032 int board;
1033 int error;
1034 struct riscom_port * port;
1035 struct riscom_board * bp;
1036
1037 board = RC_BOARD(tty->index);
1038 if (board >= RC_NBOARD || !(rc_board[board].flags & RC_BOARD_PRESENT))
1039 return -ENODEV;
1040
1041 bp = &rc_board[board];
1042 port = rc_port + board * RC_NPORT + RC_PORT(tty->index);
1043 if (rc_paranoia_check(port, tty->name, "rc_open"))
1044 return -ENODEV;
1045
1046 if ((error = rc_setup_board(bp)))
1047 return error;
1048
1049 port->count++;
1050 tty->driver_data = port;
1051 port->tty = tty;
1052
1053 if ((error = rc_setup_port(bp, port)))
1054 return error;
1055
1056 if ((error = block_til_ready(tty, filp, port)))
1057 return error;
1058
1059 return 0;
1060 }
1061
1062 static void rc_close(struct tty_struct * tty, struct file * filp)
1063 {
1064 struct riscom_port *port = (struct riscom_port *) tty->driver_data;
1065 struct riscom_board *bp;
1066 unsigned long flags;
1067 unsigned long timeout;
1068
1069 if (!port || rc_paranoia_check(port, tty->name, "close"))
1070 return;
1071
1072 save_flags(flags); cli();
1073 if (tty_hung_up_p(filp))
1074 goto out;
1075
1076 bp = port_Board(port);
1077 if ((tty->count == 1) && (port->count != 1)) {
1078 printk(KERN_INFO "rc%d: rc_close: bad port count;"
1079 " tty->count is 1, port count is %d\n",
1080 board_No(bp), port->count);
1081 port->count = 1;
1082 }
1083 if (--port->count < 0) {
1084 printk(KERN_INFO "rc%d: rc_close: bad port count "
1085 "for tty%d: %d\n",
1086 board_No(bp), port_No(port), port->count);
1087 port->count = 0;
1088 }
1089 if (port->count)
1090 goto out;
1091 port->flags |= ASYNC_CLOSING;
1092 /*
1093 * Now we wait for the transmit buffer to clear; and we notify
1094 * the line discipline to only process XON/XOFF characters.
1095 */
1096 tty->closing = 1;
1097 if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1098 tty_wait_until_sent(tty, port->closing_wait);
1099 /*
1100 * At this point we stop accepting input. To do this, we
1101 * disable the receive line status interrupts, and tell the
1102 * interrupt driver to stop checking the data ready bit in the
1103 * line status register.
1104 */
1105 port->IER &= ~IER_RXD;
1106 if (port->flags & ASYNC_INITIALIZED) {
1107 port->IER &= ~IER_TXRDY;
1108 port->IER |= IER_TXEMPTY;
1109 rc_out(bp, CD180_CAR, port_No(port));
1110 rc_out(bp, CD180_IER, port->IER);
1111 /*
1112 * Before we drop DTR, make sure the UART transmitter
1113 * has completely drained; this is especially
1114 * important if there is a transmit FIFO!
1115 */
1116 timeout = jiffies+HZ;
1117 while(port->IER & IER_TXEMPTY) {
1118 msleep_interruptible(jiffies_to_msecs(port->timeout));
1119 if (time_after(jiffies, timeout))
1120 break;
1121 }
1122 }
1123 rc_shutdown_port(bp, port);
1124 if (tty->driver->flush_buffer)
1125 tty->driver->flush_buffer(tty);
1126 tty_ldisc_flush(tty);
1127
1128 tty->closing = 0;
1129 port->event = 0;
1130 port->tty = NULL;
1131 if (port->blocked_open) {
1132 if (port->close_delay) {
1133 msleep_interruptible(jiffies_to_msecs(port->close_delay));
1134 }
1135 wake_up_interruptible(&port->open_wait);
1136 }
1137 port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1138 wake_up_interruptible(&port->close_wait);
1139 out: restore_flags(flags);
1140 }
1141
1142 static int rc_write(struct tty_struct * tty,
1143 const unsigned char *buf, int count)
1144 {
1145 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1146 struct riscom_board *bp;
1147 int c, total = 0;
1148 unsigned long flags;
1149
1150 if (rc_paranoia_check(port, tty->name, "rc_write"))
1151 return 0;
1152
1153 bp = port_Board(port);
1154
1155 if (!tty || !port->xmit_buf || !tmp_buf)
1156 return 0;
1157
1158 save_flags(flags);
1159 while (1) {
1160 cli();
1161 c = min_t(int, count, min(SERIAL_XMIT_SIZE - port->xmit_cnt - 1,
1162 SERIAL_XMIT_SIZE - port->xmit_head));
1163 if (c <= 0) {
1164 restore_flags(flags);
1165 break;
1166 }
1167
1168 memcpy(port->xmit_buf + port->xmit_head, buf, c);
1169 port->xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
1170 port->xmit_cnt += c;
1171 restore_flags(flags);
1172
1173 buf += c;
1174 count -= c;
1175 total += c;
1176 }
1177
1178 cli();
1179 if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
1180 !(port->IER & IER_TXRDY)) {
1181 port->IER |= IER_TXRDY;
1182 rc_out(bp, CD180_CAR, port_No(port));
1183 rc_out(bp, CD180_IER, port->IER);
1184 }
1185 restore_flags(flags);
1186
1187 return total;
1188 }
1189
1190 static void rc_put_char(struct tty_struct * tty, unsigned char ch)
1191 {
1192 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1193 unsigned long flags;
1194
1195 if (rc_paranoia_check(port, tty->name, "rc_put_char"))
1196 return;
1197
1198 if (!tty || !port->xmit_buf)
1199 return;
1200
1201 save_flags(flags); cli();
1202
1203 if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1204 goto out;
1205
1206 port->xmit_buf[port->xmit_head++] = ch;
1207 port->xmit_head &= SERIAL_XMIT_SIZE - 1;
1208 port->xmit_cnt++;
1209 out: restore_flags(flags);
1210 }
1211
1212 static void rc_flush_chars(struct tty_struct * tty)
1213 {
1214 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1215 unsigned long flags;
1216
1217 if (rc_paranoia_check(port, tty->name, "rc_flush_chars"))
1218 return;
1219
1220 if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
1221 !port->xmit_buf)
1222 return;
1223
1224 save_flags(flags); cli();
1225 port->IER |= IER_TXRDY;
1226 rc_out(port_Board(port), CD180_CAR, port_No(port));
1227 rc_out(port_Board(port), CD180_IER, port->IER);
1228 restore_flags(flags);
1229 }
1230
1231 static int rc_write_room(struct tty_struct * tty)
1232 {
1233 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1234 int ret;
1235
1236 if (rc_paranoia_check(port, tty->name, "rc_write_room"))
1237 return 0;
1238
1239 ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
1240 if (ret < 0)
1241 ret = 0;
1242 return ret;
1243 }
1244
1245 static int rc_chars_in_buffer(struct tty_struct *tty)
1246 {
1247 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1248
1249 if (rc_paranoia_check(port, tty->name, "rc_chars_in_buffer"))
1250 return 0;
1251
1252 return port->xmit_cnt;
1253 }
1254
1255 static void rc_flush_buffer(struct tty_struct *tty)
1256 {
1257 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1258 unsigned long flags;
1259
1260 if (rc_paranoia_check(port, tty->name, "rc_flush_buffer"))
1261 return;
1262
1263 save_flags(flags); cli();
1264 port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
1265 restore_flags(flags);
1266
1267 wake_up_interruptible(&tty->write_wait);
1268 tty_wakeup(tty);
1269 }
1270
1271 static int rc_tiocmget(struct tty_struct *tty, struct file *file)
1272 {
1273 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1274 struct riscom_board * bp;
1275 unsigned char status;
1276 unsigned int result;
1277 unsigned long flags;
1278
1279 if (rc_paranoia_check(port, tty->name, __FUNCTION__))
1280 return -ENODEV;
1281
1282 bp = port_Board(port);
1283 save_flags(flags); cli();
1284 rc_out(bp, CD180_CAR, port_No(port));
1285 status = rc_in(bp, CD180_MSVR);
1286 result = rc_in(bp, RC_RI) & (1u << port_No(port)) ? 0 : TIOCM_RNG;
1287 restore_flags(flags);
1288 result |= ((status & MSVR_RTS) ? TIOCM_RTS : 0)
1289 | ((status & MSVR_DTR) ? TIOCM_DTR : 0)
1290 | ((status & MSVR_CD) ? TIOCM_CAR : 0)
1291 | ((status & MSVR_DSR) ? TIOCM_DSR : 0)
1292 | ((status & MSVR_CTS) ? TIOCM_CTS : 0);
1293 return result;
1294 }
1295
1296 static int rc_tiocmset(struct tty_struct *tty, struct file *file,
1297 unsigned int set, unsigned int clear)
1298 {
1299 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1300 unsigned long flags;
1301 struct riscom_board *bp;
1302
1303 if (rc_paranoia_check(port, tty->name, __FUNCTION__))
1304 return -ENODEV;
1305
1306 bp = port_Board(port);
1307
1308 save_flags(flags); cli();
1309 if (set & TIOCM_RTS)
1310 port->MSVR |= MSVR_RTS;
1311 if (set & TIOCM_DTR)
1312 bp->DTR &= ~(1u << port_No(port));
1313
1314 if (clear & TIOCM_RTS)
1315 port->MSVR &= ~MSVR_RTS;
1316 if (clear & TIOCM_DTR)
1317 bp->DTR |= (1u << port_No(port));
1318
1319 rc_out(bp, CD180_CAR, port_No(port));
1320 rc_out(bp, CD180_MSVR, port->MSVR);
1321 rc_out(bp, RC_DTR, bp->DTR);
1322 restore_flags(flags);
1323 return 0;
1324 }
1325
1326 static inline void rc_send_break(struct riscom_port * port, unsigned long length)
1327 {
1328 struct riscom_board *bp = port_Board(port);
1329 unsigned long flags;
1330
1331 save_flags(flags); cli();
1332 port->break_length = RISCOM_TPS / HZ * length;
1333 port->COR2 |= COR2_ETC;
1334 port->IER |= IER_TXRDY;
1335 rc_out(bp, CD180_CAR, port_No(port));
1336 rc_out(bp, CD180_COR2, port->COR2);
1337 rc_out(bp, CD180_IER, port->IER);
1338 rc_wait_CCR(bp);
1339 rc_out(bp, CD180_CCR, CCR_CORCHG2);
1340 rc_wait_CCR(bp);
1341 restore_flags(flags);
1342 }
1343
1344 static inline int rc_set_serial_info(struct riscom_port * port,
1345 struct serial_struct __user * newinfo)
1346 {
1347 struct serial_struct tmp;
1348 struct riscom_board *bp = port_Board(port);
1349 int change_speed;
1350 unsigned long flags;
1351
1352 if (copy_from_user(&tmp, newinfo, sizeof(tmp)))
1353 return -EFAULT;
1354
1355 #if 0
1356 if ((tmp.irq != bp->irq) ||
1357 (tmp.port != bp->base) ||
1358 (tmp.type != PORT_CIRRUS) ||
1359 (tmp.baud_base != (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC) ||
1360 (tmp.custom_divisor != 0) ||
1361 (tmp.xmit_fifo_size != CD180_NFIFO) ||
1362 (tmp.flags & ~RISCOM_LEGAL_FLAGS))
1363 return -EINVAL;
1364 #endif
1365
1366 change_speed = ((port->flags & ASYNC_SPD_MASK) !=
1367 (tmp.flags & ASYNC_SPD_MASK));
1368
1369 if (!capable(CAP_SYS_ADMIN)) {
1370 if ((tmp.close_delay != port->close_delay) ||
1371 (tmp.closing_wait != port->closing_wait) ||
1372 ((tmp.flags & ~ASYNC_USR_MASK) !=
1373 (port->flags & ~ASYNC_USR_MASK)))
1374 return -EPERM;
1375 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
1376 (tmp.flags & ASYNC_USR_MASK));
1377 } else {
1378 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1379 (tmp.flags & ASYNC_FLAGS));
1380 port->close_delay = tmp.close_delay;
1381 port->closing_wait = tmp.closing_wait;
1382 }
1383 if (change_speed) {
1384 save_flags(flags); cli();
1385 rc_change_speed(bp, port);
1386 restore_flags(flags);
1387 }
1388 return 0;
1389 }
1390
1391 static inline int rc_get_serial_info(struct riscom_port * port,
1392 struct serial_struct __user *retinfo)
1393 {
1394 struct serial_struct tmp;
1395 struct riscom_board *bp = port_Board(port);
1396
1397 memset(&tmp, 0, sizeof(tmp));
1398 tmp.type = PORT_CIRRUS;
1399 tmp.line = port - rc_port;
1400 tmp.port = bp->base;
1401 tmp.irq = bp->irq;
1402 tmp.flags = port->flags;
1403 tmp.baud_base = (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC;
1404 tmp.close_delay = port->close_delay * HZ/100;
1405 tmp.closing_wait = port->closing_wait * HZ/100;
1406 tmp.xmit_fifo_size = CD180_NFIFO;
1407 return copy_to_user(retinfo, &tmp, sizeof(tmp)) ? -EFAULT : 0;
1408 }
1409
1410 static int rc_ioctl(struct tty_struct * tty, struct file * filp,
1411 unsigned int cmd, unsigned long arg)
1412
1413 {
1414 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1415 void __user *argp = (void __user *)arg;
1416 int retval;
1417
1418 if (rc_paranoia_check(port, tty->name, "rc_ioctl"))
1419 return -ENODEV;
1420
1421 switch (cmd) {
1422 case TCSBRK: /* SVID version: non-zero arg --> no break */
1423 retval = tty_check_change(tty);
1424 if (retval)
1425 return retval;
1426 tty_wait_until_sent(tty, 0);
1427 if (!arg)
1428 rc_send_break(port, HZ/4); /* 1/4 second */
1429 break;
1430 case TCSBRKP: /* support for POSIX tcsendbreak() */
1431 retval = tty_check_change(tty);
1432 if (retval)
1433 return retval;
1434 tty_wait_until_sent(tty, 0);
1435 rc_send_break(port, arg ? arg*(HZ/10) : HZ/4);
1436 break;
1437 case TIOCGSOFTCAR:
1438 return put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned __user *)argp);
1439 case TIOCSSOFTCAR:
1440 if (get_user(arg,(unsigned __user *) argp))
1441 return -EFAULT;
1442 tty->termios->c_cflag =
1443 ((tty->termios->c_cflag & ~CLOCAL) |
1444 (arg ? CLOCAL : 0));
1445 break;
1446 case TIOCGSERIAL:
1447 return rc_get_serial_info(port, argp);
1448 case TIOCSSERIAL:
1449 return rc_set_serial_info(port, argp);
1450 default:
1451 return -ENOIOCTLCMD;
1452 }
1453 return 0;
1454 }
1455
1456 static void rc_throttle(struct tty_struct * tty)
1457 {
1458 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1459 struct riscom_board *bp;
1460 unsigned long flags;
1461
1462 if (rc_paranoia_check(port, tty->name, "rc_throttle"))
1463 return;
1464
1465 bp = port_Board(port);
1466
1467 save_flags(flags); cli();
1468 port->MSVR &= ~MSVR_RTS;
1469 rc_out(bp, CD180_CAR, port_No(port));
1470 if (I_IXOFF(tty)) {
1471 rc_wait_CCR(bp);
1472 rc_out(bp, CD180_CCR, CCR_SSCH2);
1473 rc_wait_CCR(bp);
1474 }
1475 rc_out(bp, CD180_MSVR, port->MSVR);
1476 restore_flags(flags);
1477 }
1478
1479 static void rc_unthrottle(struct tty_struct * tty)
1480 {
1481 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1482 struct riscom_board *bp;
1483 unsigned long flags;
1484
1485 if (rc_paranoia_check(port, tty->name, "rc_unthrottle"))
1486 return;
1487
1488 bp = port_Board(port);
1489
1490 save_flags(flags); cli();
1491 port->MSVR |= MSVR_RTS;
1492 rc_out(bp, CD180_CAR, port_No(port));
1493 if (I_IXOFF(tty)) {
1494 rc_wait_CCR(bp);
1495 rc_out(bp, CD180_CCR, CCR_SSCH1);
1496 rc_wait_CCR(bp);
1497 }
1498 rc_out(bp, CD180_MSVR, port->MSVR);
1499 restore_flags(flags);
1500 }
1501
1502 static void rc_stop(struct tty_struct * tty)
1503 {
1504 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1505 struct riscom_board *bp;
1506 unsigned long flags;
1507
1508 if (rc_paranoia_check(port, tty->name, "rc_stop"))
1509 return;
1510
1511 bp = port_Board(port);
1512
1513 save_flags(flags); cli();
1514 port->IER &= ~IER_TXRDY;
1515 rc_out(bp, CD180_CAR, port_No(port));
1516 rc_out(bp, CD180_IER, port->IER);
1517 restore_flags(flags);
1518 }
1519
1520 static void rc_start(struct tty_struct * tty)
1521 {
1522 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1523 struct riscom_board *bp;
1524 unsigned long flags;
1525
1526 if (rc_paranoia_check(port, tty->name, "rc_start"))
1527 return;
1528
1529 bp = port_Board(port);
1530
1531 save_flags(flags); cli();
1532 if (port->xmit_cnt && port->xmit_buf && !(port->IER & IER_TXRDY)) {
1533 port->IER |= IER_TXRDY;
1534 rc_out(bp, CD180_CAR, port_No(port));
1535 rc_out(bp, CD180_IER, port->IER);
1536 }
1537 restore_flags(flags);
1538 }
1539
1540 /*
1541 * This routine is called from the work queue when the interrupt
1542 * routine has signalled that a hangup has occurred. The path of
1543 * hangup processing is:
1544 *
1545 * serial interrupt routine -> (workqueue) ->
1546 * do_rc_hangup() -> tty->hangup() -> rc_hangup()
1547 *
1548 */
1549 static void do_rc_hangup(void *private_)
1550 {
1551 struct riscom_port *port = (struct riscom_port *) private_;
1552 struct tty_struct *tty;
1553
1554 tty = port->tty;
1555 if (tty)
1556 tty_hangup(tty); /* FIXME: module removal race still here */
1557 }
1558
1559 static void rc_hangup(struct tty_struct * tty)
1560 {
1561 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1562 struct riscom_board *bp;
1563
1564 if (rc_paranoia_check(port, tty->name, "rc_hangup"))
1565 return;
1566
1567 bp = port_Board(port);
1568
1569 rc_shutdown_port(bp, port);
1570 port->event = 0;
1571 port->count = 0;
1572 port->flags &= ~ASYNC_NORMAL_ACTIVE;
1573 port->tty = NULL;
1574 wake_up_interruptible(&port->open_wait);
1575 }
1576
1577 static void rc_set_termios(struct tty_struct * tty, struct termios * old_termios)
1578 {
1579 struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1580 unsigned long flags;
1581
1582 if (rc_paranoia_check(port, tty->name, "rc_set_termios"))
1583 return;
1584
1585 if (tty->termios->c_cflag == old_termios->c_cflag &&
1586 tty->termios->c_iflag == old_termios->c_iflag)
1587 return;
1588
1589 save_flags(flags); cli();
1590 rc_change_speed(port_Board(port), port);
1591 restore_flags(flags);
1592
1593 if ((old_termios->c_cflag & CRTSCTS) &&
1594 !(tty->termios->c_cflag & CRTSCTS)) {
1595 tty->hw_stopped = 0;
1596 rc_start(tty);
1597 }
1598 }
1599
1600 static void do_softint(void *private_)
1601 {
1602 struct riscom_port *port = (struct riscom_port *) private_;
1603 struct tty_struct *tty;
1604
1605 if(!(tty = port->tty))
1606 return;
1607
1608 if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &port->event)) {
1609 tty_wakeup(tty);
1610 wake_up_interruptible(&tty->write_wait);
1611 }
1612 }
1613
1614 static struct tty_operations riscom_ops = {
1615 .open = rc_open,
1616 .close = rc_close,
1617 .write = rc_write,
1618 .put_char = rc_put_char,
1619 .flush_chars = rc_flush_chars,
1620 .write_room = rc_write_room,
1621 .chars_in_buffer = rc_chars_in_buffer,
1622 .flush_buffer = rc_flush_buffer,
1623 .ioctl = rc_ioctl,
1624 .throttle = rc_throttle,
1625 .unthrottle = rc_unthrottle,
1626 .set_termios = rc_set_termios,
1627 .stop = rc_stop,
1628 .start = rc_start,
1629 .hangup = rc_hangup,
1630 .tiocmget = rc_tiocmget,
1631 .tiocmset = rc_tiocmset,
1632 };
1633
1634 static inline int rc_init_drivers(void)
1635 {
1636 int error;
1637 int i;
1638
1639 riscom_driver = alloc_tty_driver(RC_NBOARD * RC_NPORT);
1640 if (!riscom_driver)
1641 return -ENOMEM;
1642
1643 if (!(tmp_buf = (unsigned char *) get_zeroed_page(GFP_KERNEL))) {
1644 printk(KERN_ERR "rc: Couldn't get free page.\n");
1645 put_tty_driver(riscom_driver);
1646 return 1;
1647 }
1648 memset(IRQ_to_board, 0, sizeof(IRQ_to_board));
1649 riscom_driver->owner = THIS_MODULE;
1650 riscom_driver->name = "ttyL";
1651 riscom_driver->devfs_name = "tts/L";
1652 riscom_driver->major = RISCOM8_NORMAL_MAJOR;
1653 riscom_driver->type = TTY_DRIVER_TYPE_SERIAL;
1654 riscom_driver->subtype = SERIAL_TYPE_NORMAL;
1655 riscom_driver->init_termios = tty_std_termios;
1656 riscom_driver->init_termios.c_cflag =
1657 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1658 riscom_driver->flags = TTY_DRIVER_REAL_RAW;
1659 tty_set_operations(riscom_driver, &riscom_ops);
1660 if ((error = tty_register_driver(riscom_driver))) {
1661 free_page((unsigned long)tmp_buf);
1662 put_tty_driver(riscom_driver);
1663 printk(KERN_ERR "rc: Couldn't register RISCom/8 driver, "
1664 "error = %d\n",
1665 error);
1666 return 1;
1667 }
1668
1669 memset(rc_port, 0, sizeof(rc_port));
1670 for (i = 0; i < RC_NPORT * RC_NBOARD; i++) {
1671 rc_port[i].magic = RISCOM8_MAGIC;
1672 INIT_WORK(&rc_port[i].tqueue, do_softint, &rc_port[i]);
1673 INIT_WORK(&rc_port[i].tqueue_hangup, do_rc_hangup, &rc_port[i]);
1674 rc_port[i].close_delay = 50 * HZ/100;
1675 rc_port[i].closing_wait = 3000 * HZ/100;
1676 init_waitqueue_head(&rc_port[i].open_wait);
1677 init_waitqueue_head(&rc_port[i].close_wait);
1678 }
1679
1680 return 0;
1681 }
1682
1683 static void rc_release_drivers(void)
1684 {
1685 unsigned long flags;
1686
1687 save_flags(flags);
1688 cli();
1689 free_page((unsigned long)tmp_buf);
1690 tty_unregister_driver(riscom_driver);
1691 put_tty_driver(riscom_driver);
1692 restore_flags(flags);
1693 }
1694
1695 #ifndef MODULE
1696 /*
1697 * Called at boot time.
1698 *
1699 * You can specify IO base for up to RC_NBOARD cards,
1700 * using line "riscom8=0xiobase1,0xiobase2,.." at LILO prompt.
1701 * Note that there will be no probing at default
1702 * addresses in this case.
1703 *
1704 */
1705 static int __init riscom8_setup(char *str)
1706 {
1707 int ints[RC_NBOARD];
1708 int i;
1709
1710 str = get_options(str, ARRAY_SIZE(ints), ints);
1711
1712 for (i = 0; i < RC_NBOARD; i++) {
1713 if (i < ints[0])
1714 rc_board[i].base = ints[i+1];
1715 else
1716 rc_board[i].base = 0;
1717 }
1718 return 1;
1719 }
1720
1721 __setup("riscom8=", riscom8_setup);
1722 #endif
1723
1724 static char banner[] __initdata =
1725 KERN_INFO "rc: SDL RISCom/8 card driver v1.1, (c) D.Gorodchanin "
1726 "1994-1996.\n";
1727 static char no_boards_msg[] __initdata =
1728 KERN_INFO "rc: No RISCom/8 boards detected.\n";
1729
1730 /*
1731 * This routine must be called by kernel at boot time
1732 */
1733 static int __init riscom8_init(void)
1734 {
1735 int i;
1736 int found = 0;
1737
1738 printk(banner);
1739
1740 if (rc_init_drivers())
1741 return -EIO;
1742
1743 for (i = 0; i < RC_NBOARD; i++)
1744 if (rc_board[i].base && !rc_probe(&rc_board[i]))
1745 found++;
1746
1747 if (!found) {
1748 rc_release_drivers();
1749 printk(no_boards_msg);
1750 return -EIO;
1751 }
1752 return 0;
1753 }
1754
1755 #ifdef MODULE
1756 static int iobase;
1757 static int iobase1;
1758 static int iobase2;
1759 static int iobase3;
1760 MODULE_PARM(iobase, "i");
1761 MODULE_PARM(iobase1, "i");
1762 MODULE_PARM(iobase2, "i");
1763 MODULE_PARM(iobase3, "i");
1764
1765 MODULE_LICENSE("GPL");
1766 #endif /* MODULE */
1767
1768 /*
1769 * You can setup up to 4 boards (current value of RC_NBOARD)
1770 * by specifying "iobase=0xXXX iobase1=0xXXX ..." as insmod parameter.
1771 *
1772 */
1773 static int __init riscom8_init_module (void)
1774 {
1775 #ifdef MODULE
1776 int i;
1777
1778 if (iobase || iobase1 || iobase2 || iobase3) {
1779 for(i = 0; i < RC_NBOARD; i++)
1780 rc_board[0].base = 0;
1781 }
1782
1783 if (iobase)
1784 rc_board[0].base = iobase;
1785 if (iobase1)
1786 rc_board[1].base = iobase1;
1787 if (iobase2)
1788 rc_board[2].base = iobase2;
1789 if (iobase3)
1790 rc_board[3].base = iobase3;
1791 #endif /* MODULE */
1792
1793 return riscom8_init();
1794 }
1795
1796 static void __exit riscom8_exit_module (void)
1797 {
1798 int i;
1799
1800 rc_release_drivers();
1801 for (i = 0; i < RC_NBOARD; i++)
1802 if (rc_board[i].flags & RC_BOARD_PRESENT)
1803 rc_release_io_range(&rc_board[i]);
1804
1805 }
1806
1807 module_init(riscom8_init_module);
1808 module_exit(riscom8_exit_module);
1809
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