blob: c2d9068b491d8c0dacb549b365196174ef0ec63f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/drivers/char/sa1100.c
3 *
4 * Driver for SA11x0 serial ports
5 *
6 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
7 *
8 * Copyright (C) 2000 Deep Blue Solutions Ltd.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 * $Id: sa1100.c,v 1.50 2002/07/29 14:41:04 rmk Exp $
25 *
26 */
27#include <linux/config.h>
28
29#if defined(CONFIG_SERIAL_SA1100_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
30#define SUPPORT_SYSRQ
31#endif
32
33#include <linux/module.h>
34#include <linux/ioport.h>
35#include <linux/init.h>
36#include <linux/console.h>
37#include <linux/sysrq.h>
Russell Kingd052d1b2005-10-29 19:07:23 +010038#include <linux/platform_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <linux/tty.h>
40#include <linux/tty_flip.h>
41#include <linux/serial_core.h>
42#include <linux/serial.h>
43
44#include <asm/io.h>
45#include <asm/irq.h>
46#include <asm/hardware.h>
47#include <asm/mach/serial_sa1100.h>
48
49/* We've been assigned a range on the "Low-density serial ports" major */
50#define SERIAL_SA1100_MAJOR 204
51#define MINOR_START 5
52
53#define NR_PORTS 3
54
55#define SA1100_ISR_PASS_LIMIT 256
56
57/*
58 * Convert from ignore_status_mask or read_status_mask to UTSR[01]
59 */
60#define SM_TO_UTSR0(x) ((x) & 0xff)
61#define SM_TO_UTSR1(x) ((x) >> 8)
62#define UTSR0_TO_SM(x) ((x))
63#define UTSR1_TO_SM(x) ((x) << 8)
64
65#define UART_GET_UTCR0(sport) __raw_readl((sport)->port.membase + UTCR0)
66#define UART_GET_UTCR1(sport) __raw_readl((sport)->port.membase + UTCR1)
67#define UART_GET_UTCR2(sport) __raw_readl((sport)->port.membase + UTCR2)
68#define UART_GET_UTCR3(sport) __raw_readl((sport)->port.membase + UTCR3)
69#define UART_GET_UTSR0(sport) __raw_readl((sport)->port.membase + UTSR0)
70#define UART_GET_UTSR1(sport) __raw_readl((sport)->port.membase + UTSR1)
71#define UART_GET_CHAR(sport) __raw_readl((sport)->port.membase + UTDR)
72
73#define UART_PUT_UTCR0(sport,v) __raw_writel((v),(sport)->port.membase + UTCR0)
74#define UART_PUT_UTCR1(sport,v) __raw_writel((v),(sport)->port.membase + UTCR1)
75#define UART_PUT_UTCR2(sport,v) __raw_writel((v),(sport)->port.membase + UTCR2)
76#define UART_PUT_UTCR3(sport,v) __raw_writel((v),(sport)->port.membase + UTCR3)
77#define UART_PUT_UTSR0(sport,v) __raw_writel((v),(sport)->port.membase + UTSR0)
78#define UART_PUT_UTSR1(sport,v) __raw_writel((v),(sport)->port.membase + UTSR1)
79#define UART_PUT_CHAR(sport,v) __raw_writel((v),(sport)->port.membase + UTDR)
80
81/*
82 * This is the size of our serial port register set.
83 */
84#define UART_PORT_SIZE 0x24
85
86/*
87 * This determines how often we check the modem status signals
88 * for any change. They generally aren't connected to an IRQ
89 * so we have to poll them. We also check immediately before
90 * filling the TX fifo incase CTS has been dropped.
91 */
92#define MCTRL_TIMEOUT (250*HZ/1000)
93
94struct sa1100_port {
95 struct uart_port port;
96 struct timer_list timer;
97 unsigned int old_status;
98};
99
100/*
101 * Handle any change of modem status signal since we were last called.
102 */
103static void sa1100_mctrl_check(struct sa1100_port *sport)
104{
105 unsigned int status, changed;
106
107 status = sport->port.ops->get_mctrl(&sport->port);
108 changed = status ^ sport->old_status;
109
110 if (changed == 0)
111 return;
112
113 sport->old_status = status;
114
115 if (changed & TIOCM_RI)
116 sport->port.icount.rng++;
117 if (changed & TIOCM_DSR)
118 sport->port.icount.dsr++;
119 if (changed & TIOCM_CAR)
120 uart_handle_dcd_change(&sport->port, status & TIOCM_CAR);
121 if (changed & TIOCM_CTS)
122 uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
123
124 wake_up_interruptible(&sport->port.info->delta_msr_wait);
125}
126
127/*
128 * This is our per-port timeout handler, for checking the
129 * modem status signals.
130 */
131static void sa1100_timeout(unsigned long data)
132{
133 struct sa1100_port *sport = (struct sa1100_port *)data;
134 unsigned long flags;
135
136 if (sport->port.info) {
137 spin_lock_irqsave(&sport->port.lock, flags);
138 sa1100_mctrl_check(sport);
139 spin_unlock_irqrestore(&sport->port.lock, flags);
140
141 mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
142 }
143}
144
145/*
146 * interrupts disabled on entry
147 */
Russell Kingb129a8c2005-08-31 10:12:14 +0100148static void sa1100_stop_tx(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149{
150 struct sa1100_port *sport = (struct sa1100_port *)port;
151 u32 utcr3;
152
153 utcr3 = UART_GET_UTCR3(sport);
154 UART_PUT_UTCR3(sport, utcr3 & ~UTCR3_TIE);
155 sport->port.read_status_mask &= ~UTSR0_TO_SM(UTSR0_TFS);
156}
157
158/*
Florin Malita270c7a72005-11-12 22:09:22 +0000159 * port locked and interrupts disabled
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 */
Russell Kingb129a8c2005-08-31 10:12:14 +0100161static void sa1100_start_tx(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162{
163 struct sa1100_port *sport = (struct sa1100_port *)port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 u32 utcr3;
165
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 utcr3 = UART_GET_UTCR3(sport);
167 sport->port.read_status_mask |= UTSR0_TO_SM(UTSR0_TFS);
168 UART_PUT_UTCR3(sport, utcr3 | UTCR3_TIE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169}
170
171/*
172 * Interrupts enabled
173 */
174static void sa1100_stop_rx(struct uart_port *port)
175{
176 struct sa1100_port *sport = (struct sa1100_port *)port;
177 u32 utcr3;
178
179 utcr3 = UART_GET_UTCR3(sport);
180 UART_PUT_UTCR3(sport, utcr3 & ~UTCR3_RIE);
181}
182
183/*
184 * Set the modem control timer to fire immediately.
185 */
186static void sa1100_enable_ms(struct uart_port *port)
187{
188 struct sa1100_port *sport = (struct sa1100_port *)port;
189
190 mod_timer(&sport->timer, jiffies);
191}
192
193static void
194sa1100_rx_chars(struct sa1100_port *sport, struct pt_regs *regs)
195{
196 struct tty_struct *tty = sport->port.info->tty;
Russell Kingff39bc72005-06-08 19:26:47 +0100197 unsigned int status, ch, flg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
199 status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
200 UTSR0_TO_SM(UART_GET_UTSR0(sport));
201 while (status & UTSR1_TO_SM(UTSR1_RNE)) {
202 ch = UART_GET_CHAR(sport);
203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 sport->port.icount.rx++;
205
206 flg = TTY_NORMAL;
207
208 /*
209 * note that the error handling code is
210 * out of the main execution path
211 */
Russell King2a9604b2005-04-26 15:32:00 +0100212 if (status & UTSR1_TO_SM(UTSR1_PRE | UTSR1_FRE | UTSR1_ROR)) {
213 if (status & UTSR1_TO_SM(UTSR1_PRE))
214 sport->port.icount.parity++;
215 else if (status & UTSR1_TO_SM(UTSR1_FRE))
216 sport->port.icount.frame++;
217 if (status & UTSR1_TO_SM(UTSR1_ROR))
218 sport->port.icount.overrun++;
219
220 status &= sport->port.read_status_mask;
221
222 if (status & UTSR1_TO_SM(UTSR1_PRE))
223 flg = TTY_PARITY;
224 else if (status & UTSR1_TO_SM(UTSR1_FRE))
225 flg = TTY_FRAME;
226
227#ifdef SUPPORT_SYSRQ
228 sport->port.sysrq = 0;
229#endif
230 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
232 if (uart_handle_sysrq_char(&sport->port, ch, regs))
233 goto ignore_char;
234
Russell King05ab3012005-05-09 23:21:59 +0100235 uart_insert_char(&sport->port, status, UTSR1_TO_SM(UTSR1_ROR), ch, flg);
Russell King2a9604b2005-04-26 15:32:00 +0100236
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 ignore_char:
238 status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
239 UTSR0_TO_SM(UART_GET_UTSR0(sport));
240 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 tty_flip_buffer_push(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242}
243
244static void sa1100_tx_chars(struct sa1100_port *sport)
245{
246 struct circ_buf *xmit = &sport->port.info->xmit;
247
248 if (sport->port.x_char) {
249 UART_PUT_CHAR(sport, sport->port.x_char);
250 sport->port.icount.tx++;
251 sport->port.x_char = 0;
252 return;
253 }
254
255 /*
256 * Check the modem control lines before
257 * transmitting anything.
258 */
259 sa1100_mctrl_check(sport);
260
261 if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
Russell Kingb129a8c2005-08-31 10:12:14 +0100262 sa1100_stop_tx(&sport->port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 return;
264 }
265
266 /*
267 * Tried using FIFO (not checking TNF) for fifo fill:
268 * still had the '4 bytes repeated' problem.
269 */
270 while (UART_GET_UTSR1(sport) & UTSR1_TNF) {
271 UART_PUT_CHAR(sport, xmit->buf[xmit->tail]);
272 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
273 sport->port.icount.tx++;
274 if (uart_circ_empty(xmit))
275 break;
276 }
277
278 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
279 uart_write_wakeup(&sport->port);
280
281 if (uart_circ_empty(xmit))
Russell Kingb129a8c2005-08-31 10:12:14 +0100282 sa1100_stop_tx(&sport->port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284
285static irqreturn_t sa1100_int(int irq, void *dev_id, struct pt_regs *regs)
286{
287 struct sa1100_port *sport = dev_id;
288 unsigned int status, pass_counter = 0;
289
290 spin_lock(&sport->port.lock);
291 status = UART_GET_UTSR0(sport);
292 status &= SM_TO_UTSR0(sport->port.read_status_mask) | ~UTSR0_TFS;
293 do {
294 if (status & (UTSR0_RFS | UTSR0_RID)) {
295 /* Clear the receiver idle bit, if set */
296 if (status & UTSR0_RID)
297 UART_PUT_UTSR0(sport, UTSR0_RID);
298 sa1100_rx_chars(sport, regs);
299 }
300
301 /* Clear the relevant break bits */
302 if (status & (UTSR0_RBB | UTSR0_REB))
303 UART_PUT_UTSR0(sport, status & (UTSR0_RBB | UTSR0_REB));
304
305 if (status & UTSR0_RBB)
306 sport->port.icount.brk++;
307
308 if (status & UTSR0_REB)
309 uart_handle_break(&sport->port);
310
311 if (status & UTSR0_TFS)
312 sa1100_tx_chars(sport);
313 if (pass_counter++ > SA1100_ISR_PASS_LIMIT)
314 break;
315 status = UART_GET_UTSR0(sport);
316 status &= SM_TO_UTSR0(sport->port.read_status_mask) |
317 ~UTSR0_TFS;
318 } while (status & (UTSR0_TFS | UTSR0_RFS | UTSR0_RID));
319 spin_unlock(&sport->port.lock);
320
321 return IRQ_HANDLED;
322}
323
324/*
325 * Return TIOCSER_TEMT when transmitter is not busy.
326 */
327static unsigned int sa1100_tx_empty(struct uart_port *port)
328{
329 struct sa1100_port *sport = (struct sa1100_port *)port;
330
331 return UART_GET_UTSR1(sport) & UTSR1_TBY ? 0 : TIOCSER_TEMT;
332}
333
334static unsigned int sa1100_get_mctrl(struct uart_port *port)
335{
336 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
337}
338
339static void sa1100_set_mctrl(struct uart_port *port, unsigned int mctrl)
340{
341}
342
343/*
344 * Interrupts always disabled.
345 */
346static void sa1100_break_ctl(struct uart_port *port, int break_state)
347{
348 struct sa1100_port *sport = (struct sa1100_port *)port;
349 unsigned long flags;
350 unsigned int utcr3;
351
352 spin_lock_irqsave(&sport->port.lock, flags);
353 utcr3 = UART_GET_UTCR3(sport);
354 if (break_state == -1)
355 utcr3 |= UTCR3_BRK;
356 else
357 utcr3 &= ~UTCR3_BRK;
358 UART_PUT_UTCR3(sport, utcr3);
359 spin_unlock_irqrestore(&sport->port.lock, flags);
360}
361
362static int sa1100_startup(struct uart_port *port)
363{
364 struct sa1100_port *sport = (struct sa1100_port *)port;
365 int retval;
366
367 /*
368 * Allocate the IRQ
369 */
370 retval = request_irq(sport->port.irq, sa1100_int, 0,
371 "sa11x0-uart", sport);
372 if (retval)
373 return retval;
374
375 /*
376 * Finally, clear and enable interrupts
377 */
378 UART_PUT_UTSR0(sport, -1);
379 UART_PUT_UTCR3(sport, UTCR3_RXE | UTCR3_TXE | UTCR3_RIE);
380
381 /*
382 * Enable modem status interrupts
383 */
384 spin_lock_irq(&sport->port.lock);
385 sa1100_enable_ms(&sport->port);
386 spin_unlock_irq(&sport->port.lock);
387
388 return 0;
389}
390
391static void sa1100_shutdown(struct uart_port *port)
392{
393 struct sa1100_port *sport = (struct sa1100_port *)port;
394
395 /*
396 * Stop our timer.
397 */
398 del_timer_sync(&sport->timer);
399
400 /*
401 * Free the interrupt
402 */
403 free_irq(sport->port.irq, sport);
404
405 /*
406 * Disable all interrupts, port and break condition.
407 */
408 UART_PUT_UTCR3(sport, 0);
409}
410
411static void
412sa1100_set_termios(struct uart_port *port, struct termios *termios,
413 struct termios *old)
414{
415 struct sa1100_port *sport = (struct sa1100_port *)port;
416 unsigned long flags;
417 unsigned int utcr0, old_utcr3, baud, quot;
418 unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
419
420 /*
421 * We only support CS7 and CS8.
422 */
423 while ((termios->c_cflag & CSIZE) != CS7 &&
424 (termios->c_cflag & CSIZE) != CS8) {
425 termios->c_cflag &= ~CSIZE;
426 termios->c_cflag |= old_csize;
427 old_csize = CS8;
428 }
429
430 if ((termios->c_cflag & CSIZE) == CS8)
431 utcr0 = UTCR0_DSS;
432 else
433 utcr0 = 0;
434
435 if (termios->c_cflag & CSTOPB)
436 utcr0 |= UTCR0_SBS;
437 if (termios->c_cflag & PARENB) {
438 utcr0 |= UTCR0_PE;
439 if (!(termios->c_cflag & PARODD))
440 utcr0 |= UTCR0_OES;
441 }
442
443 /*
444 * Ask the core to calculate the divisor for us.
445 */
446 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
447 quot = uart_get_divisor(port, baud);
448
449 spin_lock_irqsave(&sport->port.lock, flags);
450
451 sport->port.read_status_mask &= UTSR0_TO_SM(UTSR0_TFS);
452 sport->port.read_status_mask |= UTSR1_TO_SM(UTSR1_ROR);
453 if (termios->c_iflag & INPCK)
454 sport->port.read_status_mask |=
455 UTSR1_TO_SM(UTSR1_FRE | UTSR1_PRE);
456 if (termios->c_iflag & (BRKINT | PARMRK))
457 sport->port.read_status_mask |=
458 UTSR0_TO_SM(UTSR0_RBB | UTSR0_REB);
459
460 /*
461 * Characters to ignore
462 */
463 sport->port.ignore_status_mask = 0;
464 if (termios->c_iflag & IGNPAR)
465 sport->port.ignore_status_mask |=
466 UTSR1_TO_SM(UTSR1_FRE | UTSR1_PRE);
467 if (termios->c_iflag & IGNBRK) {
468 sport->port.ignore_status_mask |=
469 UTSR0_TO_SM(UTSR0_RBB | UTSR0_REB);
470 /*
471 * If we're ignoring parity and break indicators,
472 * ignore overruns too (for real raw support).
473 */
474 if (termios->c_iflag & IGNPAR)
475 sport->port.ignore_status_mask |=
476 UTSR1_TO_SM(UTSR1_ROR);
477 }
478
479 del_timer_sync(&sport->timer);
480
481 /*
482 * Update the per-port timeout.
483 */
484 uart_update_timeout(port, termios->c_cflag, baud);
485
486 /*
487 * disable interrupts and drain transmitter
488 */
489 old_utcr3 = UART_GET_UTCR3(sport);
490 UART_PUT_UTCR3(sport, old_utcr3 & ~(UTCR3_RIE | UTCR3_TIE));
491
492 while (UART_GET_UTSR1(sport) & UTSR1_TBY)
493 barrier();
494
495 /* then, disable everything */
496 UART_PUT_UTCR3(sport, 0);
497
498 /* set the parity, stop bits and data size */
499 UART_PUT_UTCR0(sport, utcr0);
500
501 /* set the baud rate */
502 quot -= 1;
503 UART_PUT_UTCR1(sport, ((quot & 0xf00) >> 8));
504 UART_PUT_UTCR2(sport, (quot & 0xff));
505
506 UART_PUT_UTSR0(sport, -1);
507
508 UART_PUT_UTCR3(sport, old_utcr3);
509
510 if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
511 sa1100_enable_ms(&sport->port);
512
513 spin_unlock_irqrestore(&sport->port.lock, flags);
514}
515
516static const char *sa1100_type(struct uart_port *port)
517{
518 struct sa1100_port *sport = (struct sa1100_port *)port;
519
520 return sport->port.type == PORT_SA1100 ? "SA1100" : NULL;
521}
522
523/*
524 * Release the memory region(s) being used by 'port'.
525 */
526static void sa1100_release_port(struct uart_port *port)
527{
528 struct sa1100_port *sport = (struct sa1100_port *)port;
529
530 release_mem_region(sport->port.mapbase, UART_PORT_SIZE);
531}
532
533/*
534 * Request the memory region(s) being used by 'port'.
535 */
536static int sa1100_request_port(struct uart_port *port)
537{
538 struct sa1100_port *sport = (struct sa1100_port *)port;
539
540 return request_mem_region(sport->port.mapbase, UART_PORT_SIZE,
541 "sa11x0-uart") != NULL ? 0 : -EBUSY;
542}
543
544/*
545 * Configure/autoconfigure the port.
546 */
547static void sa1100_config_port(struct uart_port *port, int flags)
548{
549 struct sa1100_port *sport = (struct sa1100_port *)port;
550
551 if (flags & UART_CONFIG_TYPE &&
552 sa1100_request_port(&sport->port) == 0)
553 sport->port.type = PORT_SA1100;
554}
555
556/*
557 * Verify the new serial_struct (for TIOCSSERIAL).
558 * The only change we allow are to the flags and type, and
559 * even then only between PORT_SA1100 and PORT_UNKNOWN
560 */
561static int
562sa1100_verify_port(struct uart_port *port, struct serial_struct *ser)
563{
564 struct sa1100_port *sport = (struct sa1100_port *)port;
565 int ret = 0;
566
567 if (ser->type != PORT_UNKNOWN && ser->type != PORT_SA1100)
568 ret = -EINVAL;
569 if (sport->port.irq != ser->irq)
570 ret = -EINVAL;
571 if (ser->io_type != SERIAL_IO_MEM)
572 ret = -EINVAL;
573 if (sport->port.uartclk / 16 != ser->baud_base)
574 ret = -EINVAL;
575 if ((void *)sport->port.mapbase != ser->iomem_base)
576 ret = -EINVAL;
577 if (sport->port.iobase != ser->port)
578 ret = -EINVAL;
579 if (ser->hub6 != 0)
580 ret = -EINVAL;
581 return ret;
582}
583
584static struct uart_ops sa1100_pops = {
585 .tx_empty = sa1100_tx_empty,
586 .set_mctrl = sa1100_set_mctrl,
587 .get_mctrl = sa1100_get_mctrl,
588 .stop_tx = sa1100_stop_tx,
589 .start_tx = sa1100_start_tx,
590 .stop_rx = sa1100_stop_rx,
591 .enable_ms = sa1100_enable_ms,
592 .break_ctl = sa1100_break_ctl,
593 .startup = sa1100_startup,
594 .shutdown = sa1100_shutdown,
595 .set_termios = sa1100_set_termios,
596 .type = sa1100_type,
597 .release_port = sa1100_release_port,
598 .request_port = sa1100_request_port,
599 .config_port = sa1100_config_port,
600 .verify_port = sa1100_verify_port,
601};
602
603static struct sa1100_port sa1100_ports[NR_PORTS];
604
605/*
606 * Setup the SA1100 serial ports. Note that we don't include the IrDA
607 * port here since we have our own SIR/FIR driver (see drivers/net/irda)
608 *
609 * Note also that we support "console=ttySAx" where "x" is either 0 or 1.
610 * Which serial port this ends up being depends on the machine you're
611 * running this kernel on. I'm not convinced that this is a good idea,
612 * but that's the way it traditionally works.
613 *
614 * Note that NanoEngine UART3 becomes UART2, and UART2 is no longer
615 * used here.
616 */
617static void __init sa1100_init_ports(void)
618{
619 static int first = 1;
620 int i;
621
622 if (!first)
623 return;
624 first = 0;
625
626 for (i = 0; i < NR_PORTS; i++) {
627 sa1100_ports[i].port.uartclk = 3686400;
628 sa1100_ports[i].port.ops = &sa1100_pops;
629 sa1100_ports[i].port.fifosize = 8;
630 sa1100_ports[i].port.line = i;
Russell King9b4a1612006-02-05 10:48:10 +0000631 sa1100_ports[i].port.iotype = UPIO_MEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 init_timer(&sa1100_ports[i].timer);
633 sa1100_ports[i].timer.function = sa1100_timeout;
634 sa1100_ports[i].timer.data = (unsigned long)&sa1100_ports[i];
635 }
636
637 /*
638 * make transmit lines outputs, so that when the port
639 * is closed, the output is in the MARK state.
640 */
641 PPDR |= PPC_TXD1 | PPC_TXD3;
642 PPSR |= PPC_TXD1 | PPC_TXD3;
643}
644
645void __init sa1100_register_uart_fns(struct sa1100_port_fns *fns)
646{
647 if (fns->get_mctrl)
648 sa1100_pops.get_mctrl = fns->get_mctrl;
649 if (fns->set_mctrl)
650 sa1100_pops.set_mctrl = fns->set_mctrl;
651
652 sa1100_pops.pm = fns->pm;
653 sa1100_pops.set_wake = fns->set_wake;
654}
655
656void __init sa1100_register_uart(int idx, int port)
657{
658 if (idx >= NR_PORTS) {
659 printk(KERN_ERR "%s: bad index number %d\n", __FUNCTION__, idx);
660 return;
661 }
662
663 switch (port) {
664 case 1:
665 sa1100_ports[idx].port.membase = (void __iomem *)&Ser1UTCR0;
666 sa1100_ports[idx].port.mapbase = _Ser1UTCR0;
667 sa1100_ports[idx].port.irq = IRQ_Ser1UART;
Russell Kingce8337c2006-01-21 19:28:15 +0000668 sa1100_ports[idx].port.flags = UPF_BOOT_AUTOCONF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 break;
670
671 case 2:
672 sa1100_ports[idx].port.membase = (void __iomem *)&Ser2UTCR0;
673 sa1100_ports[idx].port.mapbase = _Ser2UTCR0;
674 sa1100_ports[idx].port.irq = IRQ_Ser2ICP;
Russell Kingce8337c2006-01-21 19:28:15 +0000675 sa1100_ports[idx].port.flags = UPF_BOOT_AUTOCONF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 break;
677
678 case 3:
679 sa1100_ports[idx].port.membase = (void __iomem *)&Ser3UTCR0;
680 sa1100_ports[idx].port.mapbase = _Ser3UTCR0;
681 sa1100_ports[idx].port.irq = IRQ_Ser3UART;
Russell Kingce8337c2006-01-21 19:28:15 +0000682 sa1100_ports[idx].port.flags = UPF_BOOT_AUTOCONF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 break;
684
685 default:
686 printk(KERN_ERR "%s: bad port number %d\n", __FUNCTION__, port);
687 }
688}
689
690
691#ifdef CONFIG_SERIAL_SA1100_CONSOLE
Russell Kingd3587882006-03-20 20:00:09 +0000692static void sa1100_console_putchar(struct uart_port *port, int ch)
693{
694 struct sa1100_port *sport = (struct sa1100_port *)port;
695
696 while (!(UART_GET_UTSR1(sport) & UTSR1_TNF))
697 barrier();
698 UART_PUT_CHAR(sport, ch);
699}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700
701/*
702 * Interrupts are disabled on entering
703 */
704static void
705sa1100_console_write(struct console *co, const char *s, unsigned int count)
706{
707 struct sa1100_port *sport = &sa1100_ports[co->index];
Russell Kingd3587882006-03-20 20:00:09 +0000708 unsigned int old_utcr3, status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709
710 /*
711 * First, save UTCR3 and then disable interrupts
712 */
713 old_utcr3 = UART_GET_UTCR3(sport);
714 UART_PUT_UTCR3(sport, (old_utcr3 & ~(UTCR3_RIE | UTCR3_TIE)) |
715 UTCR3_TXE);
716
Russell Kingd3587882006-03-20 20:00:09 +0000717 uart_console_write(&sport->port, s, count, sa1100_console_putchar);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718
719 /*
720 * Finally, wait for transmitter to become empty
721 * and restore UTCR3
722 */
723 do {
724 status = UART_GET_UTSR1(sport);
725 } while (status & UTSR1_TBY);
726 UART_PUT_UTCR3(sport, old_utcr3);
727}
728
729/*
730 * If the port was already initialised (eg, by a boot loader),
731 * try to determine the current setup.
732 */
733static void __init
734sa1100_console_get_options(struct sa1100_port *sport, int *baud,
735 int *parity, int *bits)
736{
737 unsigned int utcr3;
738
739 utcr3 = UART_GET_UTCR3(sport) & (UTCR3_RXE | UTCR3_TXE);
740 if (utcr3 == (UTCR3_RXE | UTCR3_TXE)) {
741 /* ok, the port was enabled */
742 unsigned int utcr0, quot;
743
744 utcr0 = UART_GET_UTCR0(sport);
745
746 *parity = 'n';
747 if (utcr0 & UTCR0_PE) {
748 if (utcr0 & UTCR0_OES)
749 *parity = 'e';
750 else
751 *parity = 'o';
752 }
753
754 if (utcr0 & UTCR0_DSS)
755 *bits = 8;
756 else
757 *bits = 7;
758
759 quot = UART_GET_UTCR2(sport) | UART_GET_UTCR1(sport) << 8;
760 quot &= 0xfff;
761 *baud = sport->port.uartclk / (16 * (quot + 1));
762 }
763}
764
765static int __init
766sa1100_console_setup(struct console *co, char *options)
767{
768 struct sa1100_port *sport;
769 int baud = 9600;
770 int bits = 8;
771 int parity = 'n';
772 int flow = 'n';
773
774 /*
775 * Check whether an invalid uart number has been specified, and
776 * if so, search for the first available port that does have
777 * console support.
778 */
779 if (co->index == -1 || co->index >= NR_PORTS)
780 co->index = 0;
781 sport = &sa1100_ports[co->index];
782
783 if (options)
784 uart_parse_options(options, &baud, &parity, &bits, &flow);
785 else
786 sa1100_console_get_options(sport, &baud, &parity, &bits);
787
788 return uart_set_options(&sport->port, co, baud, parity, bits, flow);
789}
790
Vincent Sanders2d934862005-09-14 22:36:03 +0100791static struct uart_driver sa1100_reg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792static struct console sa1100_console = {
793 .name = "ttySA",
794 .write = sa1100_console_write,
795 .device = uart_console_device,
796 .setup = sa1100_console_setup,
797 .flags = CON_PRINTBUFFER,
798 .index = -1,
799 .data = &sa1100_reg,
800};
801
802static int __init sa1100_rs_console_init(void)
803{
804 sa1100_init_ports();
805 register_console(&sa1100_console);
806 return 0;
807}
808console_initcall(sa1100_rs_console_init);
809
810#define SA1100_CONSOLE &sa1100_console
811#else
812#define SA1100_CONSOLE NULL
813#endif
814
815static struct uart_driver sa1100_reg = {
816 .owner = THIS_MODULE,
817 .driver_name = "ttySA",
818 .dev_name = "ttySA",
819 .devfs_name = "ttySA",
820 .major = SERIAL_SA1100_MAJOR,
821 .minor = MINOR_START,
822 .nr = NR_PORTS,
823 .cons = SA1100_CONSOLE,
824};
825
Russell King3ae5eae2005-11-09 22:32:44 +0000826static int sa1100_serial_suspend(struct platform_device *dev, pm_message_t state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827{
Russell King3ae5eae2005-11-09 22:32:44 +0000828 struct sa1100_port *sport = platform_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829
Russell King9480e302005-10-28 09:52:56 -0700830 if (sport)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 uart_suspend_port(&sa1100_reg, &sport->port);
832
833 return 0;
834}
835
Russell King3ae5eae2005-11-09 22:32:44 +0000836static int sa1100_serial_resume(struct platform_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837{
Russell King3ae5eae2005-11-09 22:32:44 +0000838 struct sa1100_port *sport = platform_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839
Russell King9480e302005-10-28 09:52:56 -0700840 if (sport)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 uart_resume_port(&sa1100_reg, &sport->port);
842
843 return 0;
844}
845
Russell King3ae5eae2005-11-09 22:32:44 +0000846static int sa1100_serial_probe(struct platform_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 struct resource *res = dev->resource;
849 int i;
850
851 for (i = 0; i < dev->num_resources; i++, res++)
852 if (res->flags & IORESOURCE_MEM)
853 break;
854
855 if (i < dev->num_resources) {
856 for (i = 0; i < NR_PORTS; i++) {
857 if (sa1100_ports[i].port.mapbase != res->start)
858 continue;
859
Russell King3ae5eae2005-11-09 22:32:44 +0000860 sa1100_ports[i].port.dev = &dev->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 uart_add_one_port(&sa1100_reg, &sa1100_ports[i].port);
Russell King3ae5eae2005-11-09 22:32:44 +0000862 platform_set_drvdata(dev, &sa1100_ports[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 break;
864 }
865 }
866
867 return 0;
868}
869
Russell King3ae5eae2005-11-09 22:32:44 +0000870static int sa1100_serial_remove(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871{
Russell King3ae5eae2005-11-09 22:32:44 +0000872 struct sa1100_port *sport = platform_get_drvdata(pdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873
Russell King3ae5eae2005-11-09 22:32:44 +0000874 platform_set_drvdata(pdev, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875
876 if (sport)
877 uart_remove_one_port(&sa1100_reg, &sport->port);
878
879 return 0;
880}
881
Russell King3ae5eae2005-11-09 22:32:44 +0000882static struct platform_driver sa11x0_serial_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 .probe = sa1100_serial_probe,
884 .remove = sa1100_serial_remove,
885 .suspend = sa1100_serial_suspend,
886 .resume = sa1100_serial_resume,
Russell King3ae5eae2005-11-09 22:32:44 +0000887 .driver = {
888 .name = "sa11x0-uart",
889 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890};
891
892static int __init sa1100_serial_init(void)
893{
894 int ret;
895
896 printk(KERN_INFO "Serial: SA11x0 driver $Revision: 1.50 $\n");
897
898 sa1100_init_ports();
899
900 ret = uart_register_driver(&sa1100_reg);
901 if (ret == 0) {
Russell King3ae5eae2005-11-09 22:32:44 +0000902 ret = platform_driver_register(&sa11x0_serial_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 if (ret)
904 uart_unregister_driver(&sa1100_reg);
905 }
906 return ret;
907}
908
909static void __exit sa1100_serial_exit(void)
910{
Russell King3ae5eae2005-11-09 22:32:44 +0000911 platform_driver_unregister(&sa11x0_serial_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 uart_unregister_driver(&sa1100_reg);
913}
914
915module_init(sa1100_serial_init);
916module_exit(sa1100_serial_exit);
917
918MODULE_AUTHOR("Deep Blue Solutions Ltd");
919MODULE_DESCRIPTION("SA1100 generic serial port driver $Revision: 1.50 $");
920MODULE_LICENSE("GPL");
921MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_SA1100_MAJOR);