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frv: avoid infinite loop of SIGSEGV delivery
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / serial / sa1100.c
blob2199d819a9870b2d8d52d4ab8bb6ae6832d56c00
1 /*
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
25 #if defined(CONFIG_SERIAL_SA1100_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
26 #define SUPPORT_SYSRQ
27 #endif
28
29 #include <linux/module.h>
30 #include <linux/ioport.h>
31 #include <linux/init.h>
32 #include <linux/console.h>
33 #include <linux/sysrq.h>
34 #include <linux/platform_device.h>
35 #include <linux/tty.h>
36 #include <linux/tty_flip.h>
37 #include <linux/serial_core.h>
38 #include <linux/serial.h>
39 #include <linux/io.h>
40
41 #include <asm/irq.h>
42 #include <mach/hardware.h>
43 #include <asm/mach/serial_sa1100.h>
44
45 /* We've been assigned a range on the "Low-density serial ports" major */
46 #define SERIAL_SA1100_MAJOR 204
47 #define MINOR_START 5
48
49 #define NR_PORTS 3
50
51 #define SA1100_ISR_PASS_LIMIT 256
52
53 /*
54 * Convert from ignore_status_mask or read_status_mask to UTSR[01]
55 */
56 #define SM_TO_UTSR0(x) ((x) & 0xff)
57 #define SM_TO_UTSR1(x) ((x) >> 8)
58 #define UTSR0_TO_SM(x) ((x))
59 #define UTSR1_TO_SM(x) ((x) << 8)
60
61 #define UART_GET_UTCR0(sport) __raw_readl((sport)->port.membase + UTCR0)
62 #define UART_GET_UTCR1(sport) __raw_readl((sport)->port.membase + UTCR1)
63 #define UART_GET_UTCR2(sport) __raw_readl((sport)->port.membase + UTCR2)
64 #define UART_GET_UTCR3(sport) __raw_readl((sport)->port.membase + UTCR3)
65 #define UART_GET_UTSR0(sport) __raw_readl((sport)->port.membase + UTSR0)
66 #define UART_GET_UTSR1(sport) __raw_readl((sport)->port.membase + UTSR1)
67 #define UART_GET_CHAR(sport) __raw_readl((sport)->port.membase + UTDR)
68
69 #define UART_PUT_UTCR0(sport,v) __raw_writel((v),(sport)->port.membase + UTCR0)
70 #define UART_PUT_UTCR1(sport,v) __raw_writel((v),(sport)->port.membase + UTCR1)
71 #define UART_PUT_UTCR2(sport,v) __raw_writel((v),(sport)->port.membase + UTCR2)
72 #define UART_PUT_UTCR3(sport,v) __raw_writel((v),(sport)->port.membase + UTCR3)
73 #define UART_PUT_UTSR0(sport,v) __raw_writel((v),(sport)->port.membase + UTSR0)
74 #define UART_PUT_UTSR1(sport,v) __raw_writel((v),(sport)->port.membase + UTSR1)
75 #define UART_PUT_CHAR(sport,v) __raw_writel((v),(sport)->port.membase + UTDR)
76
77 /*
78 * This is the size of our serial port register set.
79 */
80 #define UART_PORT_SIZE 0x24
81
82 /*
83 * This determines how often we check the modem status signals
84 * for any change. They generally aren't connected to an IRQ
85 * so we have to poll them. We also check immediately before
86 * filling the TX fifo incase CTS has been dropped.
87 */
88 #define MCTRL_TIMEOUT (250*HZ/1000)
89
90 struct sa1100_port {
91 struct uart_port port;
92 struct timer_list timer;
93 unsigned int old_status;
94 };
95
96 /*
97 * Handle any change of modem status signal since we were last called.
98 */
99 static void sa1100_mctrl_check(struct sa1100_port *sport)
100 {
101 unsigned int status, changed;
102
103 status = sport->port.ops->get_mctrl(&sport->port);
104 changed = status ^ sport->old_status;
105
106 if (changed == 0)
107 return;
108
109 sport->old_status = status;
110
111 if (changed & TIOCM_RI)
112 sport->port.icount.rng++;
113 if (changed & TIOCM_DSR)
114 sport->port.icount.dsr++;
115 if (changed & TIOCM_CAR)
116 uart_handle_dcd_change(&sport->port, status & TIOCM_CAR);
117 if (changed & TIOCM_CTS)
118 uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
119
120 wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
121 }
122
123 /*
124 * This is our per-port timeout handler, for checking the
125 * modem status signals.
126 */
127 static void sa1100_timeout(unsigned long data)
128 {
129 struct sa1100_port *sport = (struct sa1100_port *)data;
130 unsigned long flags;
131
132 if (sport->port.state) {
133 spin_lock_irqsave(&sport->port.lock, flags);
134 sa1100_mctrl_check(sport);
135 spin_unlock_irqrestore(&sport->port.lock, flags);
136
137 mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
138 }
139 }
140
141 /*
142 * interrupts disabled on entry
143 */
144 static void sa1100_stop_tx(struct uart_port *port)
145 {
146 struct sa1100_port *sport = (struct sa1100_port *)port;
147 u32 utcr3;
148
149 utcr3 = UART_GET_UTCR3(sport);
150 UART_PUT_UTCR3(sport, utcr3 & ~UTCR3_TIE);
151 sport->port.read_status_mask &= ~UTSR0_TO_SM(UTSR0_TFS);
152 }
153
154 /*
155 * port locked and interrupts disabled
156 */
157 static void sa1100_start_tx(struct uart_port *port)
158 {
159 struct sa1100_port *sport = (struct sa1100_port *)port;
160 u32 utcr3;
161
162 utcr3 = UART_GET_UTCR3(sport);
163 sport->port.read_status_mask |= UTSR0_TO_SM(UTSR0_TFS);
164 UART_PUT_UTCR3(sport, utcr3 | UTCR3_TIE);
165 }
166
167 /*
168 * Interrupts enabled
169 */
170 static void sa1100_stop_rx(struct uart_port *port)
171 {
172 struct sa1100_port *sport = (struct sa1100_port *)port;
173 u32 utcr3;
174
175 utcr3 = UART_GET_UTCR3(sport);
176 UART_PUT_UTCR3(sport, utcr3 & ~UTCR3_RIE);
177 }
178
179 /*
180 * Set the modem control timer to fire immediately.
181 */
182 static void sa1100_enable_ms(struct uart_port *port)
183 {
184 struct sa1100_port *sport = (struct sa1100_port *)port;
185
186 mod_timer(&sport->timer, jiffies);
187 }
188
189 static void
190 sa1100_rx_chars(struct sa1100_port *sport)
191 {
192 struct tty_struct *tty = sport->port.state->port.tty;
193 unsigned int status, ch, flg;
194
195 status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
196 UTSR0_TO_SM(UART_GET_UTSR0(sport));
197 while (status & UTSR1_TO_SM(UTSR1_RNE)) {
198 ch = UART_GET_CHAR(sport);
199
200 sport->port.icount.rx++;
201
202 flg = TTY_NORMAL;
203
204 /*
205 * note that the error handling code is
206 * out of the main execution path
207 */
208 if (status & UTSR1_TO_SM(UTSR1_PRE | UTSR1_FRE | UTSR1_ROR)) {
209 if (status & UTSR1_TO_SM(UTSR1_PRE))
210 sport->port.icount.parity++;
211 else if (status & UTSR1_TO_SM(UTSR1_FRE))
212 sport->port.icount.frame++;
213 if (status & UTSR1_TO_SM(UTSR1_ROR))
214 sport->port.icount.overrun++;
215
216 status &= sport->port.read_status_mask;
217
218 if (status & UTSR1_TO_SM(UTSR1_PRE))
219 flg = TTY_PARITY;
220 else if (status & UTSR1_TO_SM(UTSR1_FRE))
221 flg = TTY_FRAME;
222
223 #ifdef SUPPORT_SYSRQ
224 sport->port.sysrq = 0;
225 #endif
226 }
227
228 if (uart_handle_sysrq_char(&sport->port, ch))
229 goto ignore_char;
230
231 uart_insert_char(&sport->port, status, UTSR1_TO_SM(UTSR1_ROR), ch, flg);
232
233 ignore_char:
234 status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
235 UTSR0_TO_SM(UART_GET_UTSR0(sport));
236 }
237 tty_flip_buffer_push(tty);
238 }
239
240 static void sa1100_tx_chars(struct sa1100_port *sport)
241 {
242 struct circ_buf *xmit = &sport->port.state->xmit;
243
244 if (sport->port.x_char) {
245 UART_PUT_CHAR(sport, sport->port.x_char);
246 sport->port.icount.tx++;
247 sport->port.x_char = 0;
248 return;
249 }
250
251 /*
252 * Check the modem control lines before
253 * transmitting anything.
254 */
255 sa1100_mctrl_check(sport);
256
257 if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
258 sa1100_stop_tx(&sport->port);
259 return;
260 }
261
262 /*
263 * Tried using FIFO (not checking TNF) for fifo fill:
264 * still had the '4 bytes repeated' problem.
265 */
266 while (UART_GET_UTSR1(sport) & UTSR1_TNF) {
267 UART_PUT_CHAR(sport, xmit->buf[xmit->tail]);
268 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
269 sport->port.icount.tx++;
270 if (uart_circ_empty(xmit))
271 break;
272 }
273
274 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
275 uart_write_wakeup(&sport->port);
276
277 if (uart_circ_empty(xmit))
278 sa1100_stop_tx(&sport->port);
279 }
280
281 static irqreturn_t sa1100_int(int irq, void *dev_id)
282 {
283 struct sa1100_port *sport = dev_id;
284 unsigned int status, pass_counter = 0;
285
286 spin_lock(&sport->port.lock);
287 status = UART_GET_UTSR0(sport);
288 status &= SM_TO_UTSR0(sport->port.read_status_mask) | ~UTSR0_TFS;
289 do {
290 if (status & (UTSR0_RFS | UTSR0_RID)) {
291 /* Clear the receiver idle bit, if set */
292 if (status & UTSR0_RID)
293 UART_PUT_UTSR0(sport, UTSR0_RID);
294 sa1100_rx_chars(sport);
295 }
296
297 /* Clear the relevant break bits */
298 if (status & (UTSR0_RBB | UTSR0_REB))
299 UART_PUT_UTSR0(sport, status & (UTSR0_RBB | UTSR0_REB));
300
301 if (status & UTSR0_RBB)
302 sport->port.icount.brk++;
303
304 if (status & UTSR0_REB)
305 uart_handle_break(&sport->port);
306
307 if (status & UTSR0_TFS)
308 sa1100_tx_chars(sport);
309 if (pass_counter++ > SA1100_ISR_PASS_LIMIT)
310 break;
311 status = UART_GET_UTSR0(sport);
312 status &= SM_TO_UTSR0(sport->port.read_status_mask) |
313 ~UTSR0_TFS;
314 } while (status & (UTSR0_TFS | UTSR0_RFS | UTSR0_RID));
315 spin_unlock(&sport->port.lock);
316
317 return IRQ_HANDLED;
318 }
319
320 /*
321 * Return TIOCSER_TEMT when transmitter is not busy.
322 */
323 static unsigned int sa1100_tx_empty(struct uart_port *port)
324 {
325 struct sa1100_port *sport = (struct sa1100_port *)port;
326
327 return UART_GET_UTSR1(sport) & UTSR1_TBY ? 0 : TIOCSER_TEMT;
328 }
329
330 static unsigned int sa1100_get_mctrl(struct uart_port *port)
331 {
332 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
333 }
334
335 static void sa1100_set_mctrl(struct uart_port *port, unsigned int mctrl)
336 {
337 }
338
339 /*
340 * Interrupts always disabled.
341 */
342 static void sa1100_break_ctl(struct uart_port *port, int break_state)
343 {
344 struct sa1100_port *sport = (struct sa1100_port *)port;
345 unsigned long flags;
346 unsigned int utcr3;
347
348 spin_lock_irqsave(&sport->port.lock, flags);
349 utcr3 = UART_GET_UTCR3(sport);
350 if (break_state == -1)
351 utcr3 |= UTCR3_BRK;
352 else
353 utcr3 &= ~UTCR3_BRK;
354 UART_PUT_UTCR3(sport, utcr3);
355 spin_unlock_irqrestore(&sport->port.lock, flags);
356 }
357
358 static int sa1100_startup(struct uart_port *port)
359 {
360 struct sa1100_port *sport = (struct sa1100_port *)port;
361 int retval;
362
363 /*
364 * Allocate the IRQ
365 */
366 retval = request_irq(sport->port.irq, sa1100_int, 0,
367 "sa11x0-uart", sport);
368 if (retval)
369 return retval;
370
371 /*
372 * Finally, clear and enable interrupts
373 */
374 UART_PUT_UTSR0(sport, -1);
375 UART_PUT_UTCR3(sport, UTCR3_RXE | UTCR3_TXE | UTCR3_RIE);
376
377 /*
378 * Enable modem status interrupts
379 */
380 spin_lock_irq(&sport->port.lock);
381 sa1100_enable_ms(&sport->port);
382 spin_unlock_irq(&sport->port.lock);
383
384 return 0;
385 }
386
387 static void sa1100_shutdown(struct uart_port *port)
388 {
389 struct sa1100_port *sport = (struct sa1100_port *)port;
390
391 /*
392 * Stop our timer.
393 */
394 del_timer_sync(&sport->timer);
395
396 /*
397 * Free the interrupt
398 */
399 free_irq(sport->port.irq, sport);
400
401 /*
402 * Disable all interrupts, port and break condition.
403 */
404 UART_PUT_UTCR3(sport, 0);
405 }
406
407 static void
408 sa1100_set_termios(struct uart_port *port, struct ktermios *termios,
409 struct ktermios *old)
410 {
411 struct sa1100_port *sport = (struct sa1100_port *)port;
412 unsigned long flags;
413 unsigned int utcr0, old_utcr3, baud, quot;
414 unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
415
416 /*
417 * We only support CS7 and CS8.
418 */
419 while ((termios->c_cflag & CSIZE) != CS7 &&
420 (termios->c_cflag & CSIZE) != CS8) {
421 termios->c_cflag &= ~CSIZE;
422 termios->c_cflag |= old_csize;
423 old_csize = CS8;
424 }
425
426 if ((termios->c_cflag & CSIZE) == CS8)
427 utcr0 = UTCR0_DSS;
428 else
429 utcr0 = 0;
430
431 if (termios->c_cflag & CSTOPB)
432 utcr0 |= UTCR0_SBS;
433 if (termios->c_cflag & PARENB) {
434 utcr0 |= UTCR0_PE;
435 if (!(termios->c_cflag & PARODD))
436 utcr0 |= UTCR0_OES;
437 }
438
439 /*
440 * Ask the core to calculate the divisor for us.
441 */
442 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
443 quot = uart_get_divisor(port, baud);
444
445 spin_lock_irqsave(&sport->port.lock, flags);
446
447 sport->port.read_status_mask &= UTSR0_TO_SM(UTSR0_TFS);
448 sport->port.read_status_mask |= UTSR1_TO_SM(UTSR1_ROR);
449 if (termios->c_iflag & INPCK)
450 sport->port.read_status_mask |=
451 UTSR1_TO_SM(UTSR1_FRE | UTSR1_PRE);
452 if (termios->c_iflag & (BRKINT | PARMRK))
453 sport->port.read_status_mask |=
454 UTSR0_TO_SM(UTSR0_RBB | UTSR0_REB);
455
456 /*
457 * Characters to ignore
458 */
459 sport->port.ignore_status_mask = 0;
460 if (termios->c_iflag & IGNPAR)
461 sport->port.ignore_status_mask |=
462 UTSR1_TO_SM(UTSR1_FRE | UTSR1_PRE);
463 if (termios->c_iflag & IGNBRK) {
464 sport->port.ignore_status_mask |=
465 UTSR0_TO_SM(UTSR0_RBB | UTSR0_REB);
466 /*
467 * If we're ignoring parity and break indicators,
468 * ignore overruns too (for real raw support).
469 */
470 if (termios->c_iflag & IGNPAR)
471 sport->port.ignore_status_mask |=
472 UTSR1_TO_SM(UTSR1_ROR);
473 }
474
475 del_timer_sync(&sport->timer);
476
477 /*
478 * Update the per-port timeout.
479 */
480 uart_update_timeout(port, termios->c_cflag, baud);
481
482 /*
483 * disable interrupts and drain transmitter
484 */
485 old_utcr3 = UART_GET_UTCR3(sport);
486 UART_PUT_UTCR3(sport, old_utcr3 & ~(UTCR3_RIE | UTCR3_TIE));
487
488 while (UART_GET_UTSR1(sport) & UTSR1_TBY)
489 barrier();
490
491 /* then, disable everything */
492 UART_PUT_UTCR3(sport, 0);
493
494 /* set the parity, stop bits and data size */
495 UART_PUT_UTCR0(sport, utcr0);
496
497 /* set the baud rate */
498 quot -= 1;
499 UART_PUT_UTCR1(sport, ((quot & 0xf00) >> 8));
500 UART_PUT_UTCR2(sport, (quot & 0xff));
501
502 UART_PUT_UTSR0(sport, -1);
503
504 UART_PUT_UTCR3(sport, old_utcr3);
505
506 if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
507 sa1100_enable_ms(&sport->port);
508
509 spin_unlock_irqrestore(&sport->port.lock, flags);
510 }
511
512 static const char *sa1100_type(struct uart_port *port)
513 {
514 struct sa1100_port *sport = (struct sa1100_port *)port;
515
516 return sport->port.type == PORT_SA1100 ? "SA1100" : NULL;
517 }
518
519 /*
520 * Release the memory region(s) being used by 'port'.
521 */
522 static void sa1100_release_port(struct uart_port *port)
523 {
524 struct sa1100_port *sport = (struct sa1100_port *)port;
525
526 release_mem_region(sport->port.mapbase, UART_PORT_SIZE);
527 }
528
529 /*
530 * Request the memory region(s) being used by 'port'.
531 */
532 static int sa1100_request_port(struct uart_port *port)
533 {
534 struct sa1100_port *sport = (struct sa1100_port *)port;
535
536 return request_mem_region(sport->port.mapbase, UART_PORT_SIZE,
537 "sa11x0-uart") != NULL ? 0 : -EBUSY;
538 }
539
540 /*
541 * Configure/autoconfigure the port.
542 */
543 static void sa1100_config_port(struct uart_port *port, int flags)
544 {
545 struct sa1100_port *sport = (struct sa1100_port *)port;
546
547 if (flags & UART_CONFIG_TYPE &&
548 sa1100_request_port(&sport->port) == 0)
549 sport->port.type = PORT_SA1100;
550 }
551
552 /*
553 * Verify the new serial_struct (for TIOCSSERIAL).
554 * The only change we allow are to the flags and type, and
555 * even then only between PORT_SA1100 and PORT_UNKNOWN
556 */
557 static int
558 sa1100_verify_port(struct uart_port *port, struct serial_struct *ser)
559 {
560 struct sa1100_port *sport = (struct sa1100_port *)port;
561 int ret = 0;
562
563 if (ser->type != PORT_UNKNOWN && ser->type != PORT_SA1100)
564 ret = -EINVAL;
565 if (sport->port.irq != ser->irq)
566 ret = -EINVAL;
567 if (ser->io_type != SERIAL_IO_MEM)
568 ret = -EINVAL;
569 if (sport->port.uartclk / 16 != ser->baud_base)
570 ret = -EINVAL;
571 if ((void *)sport->port.mapbase != ser->iomem_base)
572 ret = -EINVAL;
573 if (sport->port.iobase != ser->port)
574 ret = -EINVAL;
575 if (ser->hub6 != 0)
576 ret = -EINVAL;
577 return ret;
578 }
579
580 static struct uart_ops sa1100_pops = {
581 .tx_empty = sa1100_tx_empty,
582 .set_mctrl = sa1100_set_mctrl,
583 .get_mctrl = sa1100_get_mctrl,
584 .stop_tx = sa1100_stop_tx,
585 .start_tx = sa1100_start_tx,
586 .stop_rx = sa1100_stop_rx,
587 .enable_ms = sa1100_enable_ms,
588 .break_ctl = sa1100_break_ctl,
589 .startup = sa1100_startup,
590 .shutdown = sa1100_shutdown,
591 .set_termios = sa1100_set_termios,
592 .type = sa1100_type,
593 .release_port = sa1100_release_port,
594 .request_port = sa1100_request_port,
595 .config_port = sa1100_config_port,
596 .verify_port = sa1100_verify_port,
597 };
598
599 static struct sa1100_port sa1100_ports[NR_PORTS];
600
601 /*
602 * Setup the SA1100 serial ports. Note that we don't include the IrDA
603 * port here since we have our own SIR/FIR driver (see drivers/net/irda)
604 *
605 * Note also that we support "console=ttySAx" where "x" is either 0 or 1.
606 * Which serial port this ends up being depends on the machine you're
607 * running this kernel on. I'm not convinced that this is a good idea,
608 * but that's the way it traditionally works.
609 *
610 * Note that NanoEngine UART3 becomes UART2, and UART2 is no longer
611 * used here.
612 */
613 static void __init sa1100_init_ports(void)
614 {
615 static int first = 1;
616 int i;
617
618 if (!first)
619 return;
620 first = 0;
621
622 for (i = 0; i < NR_PORTS; i++) {
623 sa1100_ports[i].port.uartclk = 3686400;
624 sa1100_ports[i].port.ops = &sa1100_pops;
625 sa1100_ports[i].port.fifosize = 8;
626 sa1100_ports[i].port.line = i;
627 sa1100_ports[i].port.iotype = UPIO_MEM;
628 init_timer(&sa1100_ports[i].timer);
629 sa1100_ports[i].timer.function = sa1100_timeout;
630 sa1100_ports[i].timer.data = (unsigned long)&sa1100_ports[i];
631 }
632
633 /*
634 * make transmit lines outputs, so that when the port
635 * is closed, the output is in the MARK state.
636 */
637 PPDR |= PPC_TXD1 | PPC_TXD3;
638 PPSR |= PPC_TXD1 | PPC_TXD3;
639 }
640
641 void __devinit sa1100_register_uart_fns(struct sa1100_port_fns *fns)
642 {
643 if (fns->get_mctrl)
644 sa1100_pops.get_mctrl = fns->get_mctrl;
645 if (fns->set_mctrl)
646 sa1100_pops.set_mctrl = fns->set_mctrl;
647
648 sa1100_pops.pm = fns->pm;
649 sa1100_pops.set_wake = fns->set_wake;
650 }
651
652 void __init sa1100_register_uart(int idx, int port)
653 {
654 if (idx >= NR_PORTS) {
655 printk(KERN_ERR "%s: bad index number %d\n", __func__, idx);
656 return;
657 }
658
659 switch (port) {
660 case 1:
661 sa1100_ports[idx].port.membase = (void __iomem *)&Ser1UTCR0;
662 sa1100_ports[idx].port.mapbase = _Ser1UTCR0;
663 sa1100_ports[idx].port.irq = IRQ_Ser1UART;
664 sa1100_ports[idx].port.flags = UPF_BOOT_AUTOCONF;
665 break;
666
667 case 2:
668 sa1100_ports[idx].port.membase = (void __iomem *)&Ser2UTCR0;
669 sa1100_ports[idx].port.mapbase = _Ser2UTCR0;
670 sa1100_ports[idx].port.irq = IRQ_Ser2ICP;
671 sa1100_ports[idx].port.flags = UPF_BOOT_AUTOCONF;
672 break;
673
674 case 3:
675 sa1100_ports[idx].port.membase = (void __iomem *)&Ser3UTCR0;
676 sa1100_ports[idx].port.mapbase = _Ser3UTCR0;
677 sa1100_ports[idx].port.irq = IRQ_Ser3UART;
678 sa1100_ports[idx].port.flags = UPF_BOOT_AUTOCONF;
679 break;
680
681 default:
682 printk(KERN_ERR "%s: bad port number %d\n", __func__, port);
683 }
684 }
685
686
687 #ifdef CONFIG_SERIAL_SA1100_CONSOLE
688 static void sa1100_console_putchar(struct uart_port *port, int ch)
689 {
690 struct sa1100_port *sport = (struct sa1100_port *)port;
691
692 while (!(UART_GET_UTSR1(sport) & UTSR1_TNF))
693 barrier();
694 UART_PUT_CHAR(sport, ch);
695 }
696
697 /*
698 * Interrupts are disabled on entering
699 */
700 static void
701 sa1100_console_write(struct console *co, const char *s, unsigned int count)
702 {
703 struct sa1100_port *sport = &sa1100_ports[co->index];
704 unsigned int old_utcr3, status;
705
706 /*
707 * First, save UTCR3 and then disable interrupts
708 */
709 old_utcr3 = UART_GET_UTCR3(sport);
710 UART_PUT_UTCR3(sport, (old_utcr3 & ~(UTCR3_RIE | UTCR3_TIE)) |
711 UTCR3_TXE);
712
713 uart_console_write(&sport->port, s, count, sa1100_console_putchar);
714
715 /*
716 * Finally, wait for transmitter to become empty
717 * and restore UTCR3
718 */
719 do {
720 status = UART_GET_UTSR1(sport);
721 } while (status & UTSR1_TBY);
722 UART_PUT_UTCR3(sport, old_utcr3);
723 }
724
725 /*
726 * If the port was already initialised (eg, by a boot loader),
727 * try to determine the current setup.
728 */
729 static void __init
730 sa1100_console_get_options(struct sa1100_port *sport, int *baud,
731 int *parity, int *bits)
732 {
733 unsigned int utcr3;
734
735 utcr3 = UART_GET_UTCR3(sport) & (UTCR3_RXE | UTCR3_TXE);
736 if (utcr3 == (UTCR3_RXE | UTCR3_TXE)) {
737 /* ok, the port was enabled */
738 unsigned int utcr0, quot;
739
740 utcr0 = UART_GET_UTCR0(sport);
741
742 *parity = 'n';
743 if (utcr0 & UTCR0_PE) {
744 if (utcr0 & UTCR0_OES)
745 *parity = 'e';
746 else
747 *parity = 'o';
748 }
749
750 if (utcr0 & UTCR0_DSS)
751 *bits = 8;
752 else
753 *bits = 7;
754
755 quot = UART_GET_UTCR2(sport) | UART_GET_UTCR1(sport) << 8;
756 quot &= 0xfff;
757 *baud = sport->port.uartclk / (16 * (quot + 1));
758 }
759 }
760
761 static int __init
762 sa1100_console_setup(struct console *co, char *options)
763 {
764 struct sa1100_port *sport;
765 int baud = 9600;
766 int bits = 8;
767 int parity = 'n';
768 int flow = 'n';
769
770 /*
771 * Check whether an invalid uart number has been specified, and
772 * if so, search for the first available port that does have
773 * console support.
774 */
775 if (co->index == -1 || co->index >= NR_PORTS)
776 co->index = 0;
777 sport = &sa1100_ports[co->index];
778
779 if (options)
780 uart_parse_options(options, &baud, &parity, &bits, &flow);
781 else
782 sa1100_console_get_options(sport, &baud, &parity, &bits);
783
784 return uart_set_options(&sport->port, co, baud, parity, bits, flow);
785 }
786
787 static struct uart_driver sa1100_reg;
788 static struct console sa1100_console = {
789 .name = "ttySA",
790 .write = sa1100_console_write,
791 .device = uart_console_device,
792 .setup = sa1100_console_setup,
793 .flags = CON_PRINTBUFFER,
794 .index = -1,
795 .data = &sa1100_reg,
796 };
797
798 static int __init sa1100_rs_console_init(void)
799 {
800 sa1100_init_ports();
801 register_console(&sa1100_console);
802 return 0;
803 }
804 console_initcall(sa1100_rs_console_init);
805
806 #define SA1100_CONSOLE &sa1100_console
807 #else
808 #define SA1100_CONSOLE NULL
809 #endif
810
811 static struct uart_driver sa1100_reg = {
812 .owner = THIS_MODULE,
813 .driver_name = "ttySA",
814 .dev_name = "ttySA",
815 .major = SERIAL_SA1100_MAJOR,
816 .minor = MINOR_START,
817 .nr = NR_PORTS,
818 .cons = SA1100_CONSOLE,
819 };
820
821 static int sa1100_serial_suspend(struct platform_device *dev, pm_message_t state)
822 {
823 struct sa1100_port *sport = platform_get_drvdata(dev);
824
825 if (sport)
826 uart_suspend_port(&sa1100_reg, &sport->port);
827
828 return 0;
829 }
830
831 static int sa1100_serial_resume(struct platform_device *dev)
832 {
833 struct sa1100_port *sport = platform_get_drvdata(dev);
834
835 if (sport)
836 uart_resume_port(&sa1100_reg, &sport->port);
837
838 return 0;
839 }
840
841 static int sa1100_serial_probe(struct platform_device *dev)
842 {
843 struct resource *res = dev->resource;
844 int i;
845
846 for (i = 0; i < dev->num_resources; i++, res++)
847 if (res->flags & IORESOURCE_MEM)
848 break;
849
850 if (i < dev->num_resources) {
851 for (i = 0; i < NR_PORTS; i++) {
852 if (sa1100_ports[i].port.mapbase != res->start)
853 continue;
854
855 sa1100_ports[i].port.dev = &dev->dev;
856 uart_add_one_port(&sa1100_reg, &sa1100_ports[i].port);
857 platform_set_drvdata(dev, &sa1100_ports[i]);
858 break;
859 }
860 }
861
862 return 0;
863 }
864
865 static int sa1100_serial_remove(struct platform_device *pdev)
866 {
867 struct sa1100_port *sport = platform_get_drvdata(pdev);
868
869 platform_set_drvdata(pdev, NULL);
870
871 if (sport)
872 uart_remove_one_port(&sa1100_reg, &sport->port);
873
874 return 0;
875 }
876
877 static struct platform_driver sa11x0_serial_driver = {
878 .probe = sa1100_serial_probe,
879 .remove = sa1100_serial_remove,
880 .suspend = sa1100_serial_suspend,
881 .resume = sa1100_serial_resume,
882 .driver = {
883 .name = "sa11x0-uart",
884 .owner = THIS_MODULE,
885 },
886 };
887
888 static int __init sa1100_serial_init(void)
889 {
890 int ret;
891
892 printk(KERN_INFO "Serial: SA11x0 driver\n");
893
894 sa1100_init_ports();
895
896 ret = uart_register_driver(&sa1100_reg);
897 if (ret == 0) {
898 ret = platform_driver_register(&sa11x0_serial_driver);
899 if (ret)
900 uart_unregister_driver(&sa1100_reg);
901 }
902 return ret;
903 }
904
905 static void __exit sa1100_serial_exit(void)
906 {
907 platform_driver_unregister(&sa11x0_serial_driver);
908 uart_unregister_driver(&sa1100_reg);
909 }
910
911 module_init(sa1100_serial_init);
912 module_exit(sa1100_serial_exit);
913
914 MODULE_AUTHOR("Deep Blue Solutions Ltd");
915 MODULE_DESCRIPTION("SA1100 generic serial port driver");
916 MODULE_LICENSE("GPL");
917 MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_SA1100_MAJOR);
918 MODULE_ALIAS("platform:sa11x0-uart");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree