projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
ftrace, sched: Add TRACE_FLAG_PREEMPT_RESCHED
[deliverable/linux.git] / drivers / tty / serial / sa1100.c
1 /*
2 * Driver for SA11x0 serial ports
3 *
4 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
5 *
6 * Copyright (C) 2000 Deep Blue Solutions Ltd.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23 #if defined(CONFIG_SERIAL_SA1100_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
24 #define SUPPORT_SYSRQ
25 #endif
26
27 #include <linux/module.h>
28 #include <linux/ioport.h>
29 #include <linux/init.h>
30 #include <linux/console.h>
31 #include <linux/sysrq.h>
32 #include <linux/platform_data/sa11x0-serial.h>
33 #include <linux/platform_device.h>
34 #include <linux/tty.h>
35 #include <linux/tty_flip.h>
36 #include <linux/serial_core.h>
37 #include <linux/serial.h>
38 #include <linux/io.h>
39
40 #include <asm/irq.h>
41 #include <mach/hardware.h>
42 #include <mach/irqs.h>
43
44 /* We've been assigned a range on the "Low-density serial ports" major */
45 #define SERIAL_SA1100_MAJOR 204
46 #define MINOR_START 5
47
48 #define NR_PORTS 3
49
50 #define SA1100_ISR_PASS_LIMIT 256
51
52 /*
53 * Convert from ignore_status_mask or read_status_mask to UTSR[01]
54 */
55 #define SM_TO_UTSR0(x) ((x) & 0xff)
56 #define SM_TO_UTSR1(x) ((x) >> 8)
57 #define UTSR0_TO_SM(x) ((x))
58 #define UTSR1_TO_SM(x) ((x) << 8)
59
60 #define UART_GET_UTCR0(sport) __raw_readl((sport)->port.membase + UTCR0)
61 #define UART_GET_UTCR1(sport) __raw_readl((sport)->port.membase + UTCR1)
62 #define UART_GET_UTCR2(sport) __raw_readl((sport)->port.membase + UTCR2)
63 #define UART_GET_UTCR3(sport) __raw_readl((sport)->port.membase + UTCR3)
64 #define UART_GET_UTSR0(sport) __raw_readl((sport)->port.membase + UTSR0)
65 #define UART_GET_UTSR1(sport) __raw_readl((sport)->port.membase + UTSR1)
66 #define UART_GET_CHAR(sport) __raw_readl((sport)->port.membase + UTDR)
67
68 #define UART_PUT_UTCR0(sport,v) __raw_writel((v),(sport)->port.membase + UTCR0)
69 #define UART_PUT_UTCR1(sport,v) __raw_writel((v),(sport)->port.membase + UTCR1)
70 #define UART_PUT_UTCR2(sport,v) __raw_writel((v),(sport)->port.membase + UTCR2)
71 #define UART_PUT_UTCR3(sport,v) __raw_writel((v),(sport)->port.membase + UTCR3)
72 #define UART_PUT_UTSR0(sport,v) __raw_writel((v),(sport)->port.membase + UTSR0)
73 #define UART_PUT_UTSR1(sport,v) __raw_writel((v),(sport)->port.membase + UTSR1)
74 #define UART_PUT_CHAR(sport,v) __raw_writel((v),(sport)->port.membase + UTDR)
75
76 /*
77 * This is the size of our serial port register set.
78 */
79 #define UART_PORT_SIZE 0x24
80
81 /*
82 * This determines how often we check the modem status signals
83 * for any change. They generally aren't connected to an IRQ
84 * so we have to poll them. We also check immediately before
85 * filling the TX fifo incase CTS has been dropped.
86 */
87 #define MCTRL_TIMEOUT (250*HZ/1000)
88
89 struct sa1100_port {
90 struct uart_port port;
91 struct timer_list timer;
92 unsigned int old_status;
93 };
94
95 /*
96 * Handle any change of modem status signal since we were last called.
97 */
98 static void sa1100_mctrl_check(struct sa1100_port *sport)
99 {
100 unsigned int status, changed;
101
102 status = sport->port.ops->get_mctrl(&sport->port);
103 changed = status ^ sport->old_status;
104
105 if (changed == 0)
106 return;
107
108 sport->old_status = status;
109
110 if (changed & TIOCM_RI)
111 sport->port.icount.rng++;
112 if (changed & TIOCM_DSR)
113 sport->port.icount.dsr++;
114 if (changed & TIOCM_CAR)
115 uart_handle_dcd_change(&sport->port, status & TIOCM_CAR);
116 if (changed & TIOCM_CTS)
117 uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
118
119 wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
120 }
121
122 /*
123 * This is our per-port timeout handler, for checking the
124 * modem status signals.
125 */
126 static void sa1100_timeout(unsigned long data)
127 {
128 struct sa1100_port *sport = (struct sa1100_port *)data;
129 unsigned long flags;
130
131 if (sport->port.state) {
132 spin_lock_irqsave(&sport->port.lock, flags);
133 sa1100_mctrl_check(sport);
134 spin_unlock_irqrestore(&sport->port.lock, flags);
135
136 mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
137 }
138 }
139
140 /*
141 * interrupts disabled on entry
142 */
143 static void sa1100_stop_tx(struct uart_port *port)
144 {
145 struct sa1100_port *sport = (struct sa1100_port *)port;
146 u32 utcr3;
147
148 utcr3 = UART_GET_UTCR3(sport);
149 UART_PUT_UTCR3(sport, utcr3 & ~UTCR3_TIE);
150 sport->port.read_status_mask &= ~UTSR0_TO_SM(UTSR0_TFS);
151 }
152
153 /*
154 * port locked and interrupts disabled
155 */
156 static void sa1100_start_tx(struct uart_port *port)
157 {
158 struct sa1100_port *sport = (struct sa1100_port *)port;
159 u32 utcr3;
160
161 utcr3 = UART_GET_UTCR3(sport);
162 sport->port.read_status_mask |= UTSR0_TO_SM(UTSR0_TFS);
163 UART_PUT_UTCR3(sport, utcr3 | UTCR3_TIE);
164 }
165
166 /*
167 * Interrupts enabled
168 */
169 static void sa1100_stop_rx(struct uart_port *port)
170 {
171 struct sa1100_port *sport = (struct sa1100_port *)port;
172 u32 utcr3;
173
174 utcr3 = UART_GET_UTCR3(sport);
175 UART_PUT_UTCR3(sport, utcr3 & ~UTCR3_RIE);
176 }
177
178 /*
179 * Set the modem control timer to fire immediately.
180 */
181 static void sa1100_enable_ms(struct uart_port *port)
182 {
183 struct sa1100_port *sport = (struct sa1100_port *)port;
184
185 mod_timer(&sport->timer, jiffies);
186 }
187
188 static void
189 sa1100_rx_chars(struct sa1100_port *sport)
190 {
191 unsigned int status, ch, flg;
192
193 status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
194 UTSR0_TO_SM(UART_GET_UTSR0(sport));
195 while (status & UTSR1_TO_SM(UTSR1_RNE)) {
196 ch = UART_GET_CHAR(sport);
197
198 sport->port.icount.rx++;
199
200 flg = TTY_NORMAL;
201
202 /*
203 * note that the error handling code is
204 * out of the main execution path
205 */
206 if (status & UTSR1_TO_SM(UTSR1_PRE | UTSR1_FRE | UTSR1_ROR)) {
207 if (status & UTSR1_TO_SM(UTSR1_PRE))
208 sport->port.icount.parity++;
209 else if (status & UTSR1_TO_SM(UTSR1_FRE))
210 sport->port.icount.frame++;
211 if (status & UTSR1_TO_SM(UTSR1_ROR))
212 sport->port.icount.overrun++;
213
214 status &= sport->port.read_status_mask;
215
216 if (status & UTSR1_TO_SM(UTSR1_PRE))
217 flg = TTY_PARITY;
218 else if (status & UTSR1_TO_SM(UTSR1_FRE))
219 flg = TTY_FRAME;
220
221 #ifdef SUPPORT_SYSRQ
222 sport->port.sysrq = 0;
223 #endif
224 }
225
226 if (uart_handle_sysrq_char(&sport->port, ch))
227 goto ignore_char;
228
229 uart_insert_char(&sport->port, status, UTSR1_TO_SM(UTSR1_ROR), ch, flg);
230
231 ignore_char:
232 status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
233 UTSR0_TO_SM(UART_GET_UTSR0(sport));
234 }
235
236 spin_unlock(&sport->port.lock);
237 tty_flip_buffer_push(&sport->port.state->port);
238 spin_lock(&sport->port.lock);
239 }
240
241 static void sa1100_tx_chars(struct sa1100_port *sport)
242 {
243 struct circ_buf *xmit = &sport->port.state->xmit;
244
245 if (sport->port.x_char) {
246 UART_PUT_CHAR(sport, sport->port.x_char);
247 sport->port.icount.tx++;
248 sport->port.x_char = 0;
249 return;
250 }
251
252 /*
253 * Check the modem control lines before
254 * transmitting anything.
255 */
256 sa1100_mctrl_check(sport);
257
258 if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
259 sa1100_stop_tx(&sport->port);
260 return;
261 }
262
263 /*
264 * Tried using FIFO (not checking TNF) for fifo fill:
265 * still had the '4 bytes repeated' problem.
266 */
267 while (UART_GET_UTSR1(sport) & UTSR1_TNF) {
268 UART_PUT_CHAR(sport, xmit->buf[xmit->tail]);
269 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
270 sport->port.icount.tx++;
271 if (uart_circ_empty(xmit))
272 break;
273 }
274
275 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
276 uart_write_wakeup(&sport->port);
277
278 if (uart_circ_empty(xmit))
279 sa1100_stop_tx(&sport->port);
280 }
281
282 static irqreturn_t sa1100_int(int irq, void *dev_id)
283 {
284 struct sa1100_port *sport = dev_id;
285 unsigned int status, pass_counter = 0;
286
287 spin_lock(&sport->port.lock);
288 status = UART_GET_UTSR0(sport);
289 status &= SM_TO_UTSR0(sport->port.read_status_mask) | ~UTSR0_TFS;
290 do {
291 if (status & (UTSR0_RFS | UTSR0_RID)) {
292 /* Clear the receiver idle bit, if set */
293 if (status & UTSR0_RID)
294 UART_PUT_UTSR0(sport, UTSR0_RID);
295 sa1100_rx_chars(sport);
296 }
297
298 /* Clear the relevant break bits */
299 if (status & (UTSR0_RBB | UTSR0_REB))
300 UART_PUT_UTSR0(sport, status & (UTSR0_RBB | UTSR0_REB));
301
302 if (status & UTSR0_RBB)
303 sport->port.icount.brk++;
304
305 if (status & UTSR0_REB)
306 uart_handle_break(&sport->port);
307
308 if (status & UTSR0_TFS)
309 sa1100_tx_chars(sport);
310 if (pass_counter++ > SA1100_ISR_PASS_LIMIT)
311 break;
312 status = UART_GET_UTSR0(sport);
313 status &= SM_TO_UTSR0(sport->port.read_status_mask) |
314 ~UTSR0_TFS;
315 } while (status & (UTSR0_TFS | UTSR0_RFS | UTSR0_RID));
316 spin_unlock(&sport->port.lock);
317
318 return IRQ_HANDLED;
319 }
320
321 /*
322 * Return TIOCSER_TEMT when transmitter is not busy.
323 */
324 static unsigned int sa1100_tx_empty(struct uart_port *port)
325 {
326 struct sa1100_port *sport = (struct sa1100_port *)port;
327
328 return UART_GET_UTSR1(sport) & UTSR1_TBY ? 0 : TIOCSER_TEMT;
329 }
330
331 static unsigned int sa1100_get_mctrl(struct uart_port *port)
332 {
333 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
334 }
335
336 static void sa1100_set_mctrl(struct uart_port *port, unsigned int mctrl)
337 {
338 }
339
340 /*
341 * Interrupts always disabled.
342 */
343 static void sa1100_break_ctl(struct uart_port *port, int break_state)
344 {
345 struct sa1100_port *sport = (struct sa1100_port *)port;
346 unsigned long flags;
347 unsigned int utcr3;
348
349 spin_lock_irqsave(&sport->port.lock, flags);
350 utcr3 = UART_GET_UTCR3(sport);
351 if (break_state == -1)
352 utcr3 |= UTCR3_BRK;
353 else
354 utcr3 &= ~UTCR3_BRK;
355 UART_PUT_UTCR3(sport, utcr3);
356 spin_unlock_irqrestore(&sport->port.lock, flags);
357 }
358
359 static int sa1100_startup(struct uart_port *port)
360 {
361 struct sa1100_port *sport = (struct sa1100_port *)port;
362 int retval;
363
364 /*
365 * Allocate the IRQ
366 */
367 retval = request_irq(sport->port.irq, sa1100_int, 0,
368 "sa11x0-uart", sport);
369 if (retval)
370 return retval;
371
372 /*
373 * Finally, clear and enable interrupts
374 */
375 UART_PUT_UTSR0(sport, -1);
376 UART_PUT_UTCR3(sport, UTCR3_RXE | UTCR3_TXE | UTCR3_RIE);
377
378 /*
379 * Enable modem status interrupts
380 */
381 spin_lock_irq(&sport->port.lock);
382 sa1100_enable_ms(&sport->port);
383 spin_unlock_irq(&sport->port.lock);
384
385 return 0;
386 }
387
388 static void sa1100_shutdown(struct uart_port *port)
389 {
390 struct sa1100_port *sport = (struct sa1100_port *)port;
391
392 /*
393 * Stop our timer.
394 */
395 del_timer_sync(&sport->timer);
396
397 /*
398 * Free the interrupt
399 */
400 free_irq(sport->port.irq, sport);
401
402 /*
403 * Disable all interrupts, port and break condition.
404 */
405 UART_PUT_UTCR3(sport, 0);
406 }
407
408 static void
409 sa1100_set_termios(struct uart_port *port, struct ktermios *termios,
410 struct ktermios *old)
411 {
412 struct sa1100_port *sport = (struct sa1100_port *)port;
413 unsigned long flags;
414 unsigned int utcr0, old_utcr3, baud, quot;
415 unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
416
417 /*
418 * We only support CS7 and CS8.
419 */
420 while ((termios->c_cflag & CSIZE) != CS7 &&
421 (termios->c_cflag & CSIZE) != CS8) {
422 termios->c_cflag &= ~CSIZE;
423 termios->c_cflag |= old_csize;
424 old_csize = CS8;
425 }
426
427 if ((termios->c_cflag & CSIZE) == CS8)
428 utcr0 = UTCR0_DSS;
429 else
430 utcr0 = 0;
431
432 if (termios->c_cflag & CSTOPB)
433 utcr0 |= UTCR0_SBS;
434 if (termios->c_cflag & PARENB) {
435 utcr0 |= UTCR0_PE;
436 if (!(termios->c_cflag & PARODD))
437 utcr0 |= UTCR0_OES;
438 }
439
440 /*
441 * Ask the core to calculate the divisor for us.
442 */
443 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
444 quot = uart_get_divisor(port, baud);
445
446 spin_lock_irqsave(&sport->port.lock, flags);
447
448 sport->port.read_status_mask &= UTSR0_TO_SM(UTSR0_TFS);
449 sport->port.read_status_mask |= UTSR1_TO_SM(UTSR1_ROR);
450 if (termios->c_iflag & INPCK)
451 sport->port.read_status_mask |=
452 UTSR1_TO_SM(UTSR1_FRE | UTSR1_PRE);
453 if (termios->c_iflag & (BRKINT | PARMRK))
454 sport->port.read_status_mask |=
455 UTSR0_TO_SM(UTSR0_RBB | UTSR0_REB);
456
457 /*
458 * Characters to ignore
459 */
460 sport->port.ignore_status_mask = 0;
461 if (termios->c_iflag & IGNPAR)
462 sport->port.ignore_status_mask |=
463 UTSR1_TO_SM(UTSR1_FRE | UTSR1_PRE);
464 if (termios->c_iflag & IGNBRK) {
465 sport->port.ignore_status_mask |=
466 UTSR0_TO_SM(UTSR0_RBB | UTSR0_REB);
467 /*
468 * If we're ignoring parity and break indicators,
469 * ignore overruns too (for real raw support).
470 */
471 if (termios->c_iflag & IGNPAR)
472 sport->port.ignore_status_mask |=
473 UTSR1_TO_SM(UTSR1_ROR);
474 }
475
476 del_timer_sync(&sport->timer);
477
478 /*
479 * Update the per-port timeout.
480 */
481 uart_update_timeout(port, termios->c_cflag, baud);
482
483 /*
484 * disable interrupts and drain transmitter
485 */
486 old_utcr3 = UART_GET_UTCR3(sport);
487 UART_PUT_UTCR3(sport, old_utcr3 & ~(UTCR3_RIE | UTCR3_TIE));
488
489 while (UART_GET_UTSR1(sport) & UTSR1_TBY)
490 barrier();
491
492 /* then, disable everything */
493 UART_PUT_UTCR3(sport, 0);
494
495 /* set the parity, stop bits and data size */
496 UART_PUT_UTCR0(sport, utcr0);
497
498 /* set the baud rate */
499 quot -= 1;
500 UART_PUT_UTCR1(sport, ((quot & 0xf00) >> 8));
501 UART_PUT_UTCR2(sport, (quot & 0xff));
502
503 UART_PUT_UTSR0(sport, -1);
504
505 UART_PUT_UTCR3(sport, old_utcr3);
506
507 if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
508 sa1100_enable_ms(&sport->port);
509
510 spin_unlock_irqrestore(&sport->port.lock, flags);
511 }
512
513 static const char *sa1100_type(struct uart_port *port)
514 {
515 struct sa1100_port *sport = (struct sa1100_port *)port;
516
517 return sport->port.type == PORT_SA1100 ? "SA1100" : NULL;
518 }
519
520 /*
521 * Release the memory region(s) being used by 'port'.
522 */
523 static void sa1100_release_port(struct uart_port *port)
524 {
525 struct sa1100_port *sport = (struct sa1100_port *)port;
526
527 release_mem_region(sport->port.mapbase, UART_PORT_SIZE);
528 }
529
530 /*
531 * Request the memory region(s) being used by 'port'.
532 */
533 static int sa1100_request_port(struct uart_port *port)
534 {
535 struct sa1100_port *sport = (struct sa1100_port *)port;
536
537 return request_mem_region(sport->port.mapbase, UART_PORT_SIZE,
538 "sa11x0-uart") != NULL ? 0 : -EBUSY;
539 }
540
541 /*
542 * Configure/autoconfigure the port.
543 */
544 static void sa1100_config_port(struct uart_port *port, int flags)
545 {
546 struct sa1100_port *sport = (struct sa1100_port *)port;
547
548 if (flags & UART_CONFIG_TYPE &&
549 sa1100_request_port(&sport->port) == 0)
550 sport->port.type = PORT_SA1100;
551 }
552
553 /*
554 * Verify the new serial_struct (for TIOCSSERIAL).
555 * The only change we allow are to the flags and type, and
556 * even then only between PORT_SA1100 and PORT_UNKNOWN
557 */
558 static int
559 sa1100_verify_port(struct uart_port *port, struct serial_struct *ser)
560 {
561 struct sa1100_port *sport = (struct sa1100_port *)port;
562 int ret = 0;
563
564 if (ser->type != PORT_UNKNOWN && ser->type != PORT_SA1100)
565 ret = -EINVAL;
566 if (sport->port.irq != ser->irq)
567 ret = -EINVAL;
568 if (ser->io_type != SERIAL_IO_MEM)
569 ret = -EINVAL;
570 if (sport->port.uartclk / 16 != ser->baud_base)
571 ret = -EINVAL;
572 if ((void *)sport->port.mapbase != ser->iomem_base)
573 ret = -EINVAL;
574 if (sport->port.iobase != ser->port)
575 ret = -EINVAL;
576 if (ser->hub6 != 0)
577 ret = -EINVAL;
578 return ret;
579 }
580
581 static struct uart_ops sa1100_pops = {
582 .tx_empty = sa1100_tx_empty,
583 .set_mctrl = sa1100_set_mctrl,
584 .get_mctrl = sa1100_get_mctrl,
585 .stop_tx = sa1100_stop_tx,
586 .start_tx = sa1100_start_tx,
587 .stop_rx = sa1100_stop_rx,
588 .enable_ms = sa1100_enable_ms,
589 .break_ctl = sa1100_break_ctl,
590 .startup = sa1100_startup,
591 .shutdown = sa1100_shutdown,
592 .set_termios = sa1100_set_termios,
593 .type = sa1100_type,
594 .release_port = sa1100_release_port,
595 .request_port = sa1100_request_port,
596 .config_port = sa1100_config_port,
597 .verify_port = sa1100_verify_port,
598 };
599
600 static struct sa1100_port sa1100_ports[NR_PORTS];
601
602 /*
603 * Setup the SA1100 serial ports. Note that we don't include the IrDA
604 * port here since we have our own SIR/FIR driver (see drivers/net/irda)
605 *
606 * Note also that we support "console=ttySAx" where "x" is either 0 or 1.
607 * Which serial port this ends up being depends on the machine you're
608 * running this kernel on. I'm not convinced that this is a good idea,
609 * but that's the way it traditionally works.
610 *
611 * Note that NanoEngine UART3 becomes UART2, and UART2 is no longer
612 * used here.
613 */
614 static void __init sa1100_init_ports(void)
615 {
616 static int first = 1;
617 int i;
618
619 if (!first)
620 return;
621 first = 0;
622
623 for (i = 0; i < NR_PORTS; i++) {
624 sa1100_ports[i].port.uartclk = 3686400;
625 sa1100_ports[i].port.ops = &sa1100_pops;
626 sa1100_ports[i].port.fifosize = 8;
627 sa1100_ports[i].port.line = i;
628 sa1100_ports[i].port.iotype = UPIO_MEM;
629 init_timer(&sa1100_ports[i].timer);
630 sa1100_ports[i].timer.function = sa1100_timeout;
631 sa1100_ports[i].timer.data = (unsigned long)&sa1100_ports[i];
632 }
633
634 /*
635 * make transmit lines outputs, so that when the port
636 * is closed, the output is in the MARK state.
637 */
638 PPDR |= PPC_TXD1 | PPC_TXD3;
639 PPSR |= PPC_TXD1 | PPC_TXD3;
640 }
641
642 void sa1100_register_uart_fns(struct sa1100_port_fns *fns)
643 {
644 if (fns->get_mctrl)
645 sa1100_pops.get_mctrl = fns->get_mctrl;
646 if (fns->set_mctrl)
647 sa1100_pops.set_mctrl = fns->set_mctrl;
648
649 sa1100_pops.pm = fns->pm;
650 sa1100_pops.set_wake = fns->set_wake;
651 }
652
653 void __init sa1100_register_uart(int idx, int port)
654 {
655 if (idx >= NR_PORTS) {
656 printk(KERN_ERR "%s: bad index number %d\n", __func__, idx);
657 return;
658 }
659
660 switch (port) {
661 case 1:
662 sa1100_ports[idx].port.membase = (void __iomem *)&Ser1UTCR0;
663 sa1100_ports[idx].port.mapbase = _Ser1UTCR0;
664 sa1100_ports[idx].port.irq = IRQ_Ser1UART;
665 sa1100_ports[idx].port.flags = UPF_BOOT_AUTOCONF;
666 break;
667
668 case 2:
669 sa1100_ports[idx].port.membase = (void __iomem *)&Ser2UTCR0;
670 sa1100_ports[idx].port.mapbase = _Ser2UTCR0;
671 sa1100_ports[idx].port.irq = IRQ_Ser2ICP;
672 sa1100_ports[idx].port.flags = UPF_BOOT_AUTOCONF;
673 break;
674
675 case 3:
676 sa1100_ports[idx].port.membase = (void __iomem *)&Ser3UTCR0;
677 sa1100_ports[idx].port.mapbase = _Ser3UTCR0;
678 sa1100_ports[idx].port.irq = IRQ_Ser3UART;
679 sa1100_ports[idx].port.flags = UPF_BOOT_AUTOCONF;
680 break;
681
682 default:
683 printk(KERN_ERR "%s: bad port number %d\n", __func__, port);
684 }
685 }
686
687
688 #ifdef CONFIG_SERIAL_SA1100_CONSOLE
689 static void sa1100_console_putchar(struct uart_port *port, int ch)
690 {
691 struct sa1100_port *sport = (struct sa1100_port *)port;
692
693 while (!(UART_GET_UTSR1(sport) & UTSR1_TNF))
694 barrier();
695 UART_PUT_CHAR(sport, ch);
696 }
697
698 /*
699 * Interrupts are disabled on entering
700 */
701 static void
702 sa1100_console_write(struct console *co, const char *s, unsigned int count)
703 {
704 struct sa1100_port *sport = &sa1100_ports[co->index];
705 unsigned int old_utcr3, status;
706
707 /*
708 * First, save UTCR3 and then disable interrupts
709 */
710 old_utcr3 = UART_GET_UTCR3(sport);
711 UART_PUT_UTCR3(sport, (old_utcr3 & ~(UTCR3_RIE | UTCR3_TIE)) |
712 UTCR3_TXE);
713
714 uart_console_write(&sport->port, s, count, sa1100_console_putchar);
715
716 /*
717 * Finally, wait for transmitter to become empty
718 * and restore UTCR3
719 */
720 do {
721 status = UART_GET_UTSR1(sport);
722 } while (status & UTSR1_TBY);
723 UART_PUT_UTCR3(sport, old_utcr3);
724 }
725
726 /*
727 * If the port was already initialised (eg, by a boot loader),
728 * try to determine the current setup.
729 */
730 static void __init
731 sa1100_console_get_options(struct sa1100_port *sport, int *baud,
732 int *parity, int *bits)
733 {
734 unsigned int utcr3;
735
736 utcr3 = UART_GET_UTCR3(sport) & (UTCR3_RXE | UTCR3_TXE);
737 if (utcr3 == (UTCR3_RXE | UTCR3_TXE)) {
738 /* ok, the port was enabled */
739 unsigned int utcr0, quot;
740
741 utcr0 = UART_GET_UTCR0(sport);
742
743 *parity = 'n';
744 if (utcr0 & UTCR0_PE) {
745 if (utcr0 & UTCR0_OES)
746 *parity = 'e';
747 else
748 *parity = 'o';
749 }
750
751 if (utcr0 & UTCR0_DSS)
752 *bits = 8;
753 else
754 *bits = 7;
755
756 quot = UART_GET_UTCR2(sport) | UART_GET_UTCR1(sport) << 8;
757 quot &= 0xfff;
758 *baud = sport->port.uartclk / (16 * (quot + 1));
759 }
760 }
761
762 static int __init
763 sa1100_console_setup(struct console *co, char *options)
764 {
765 struct sa1100_port *sport;
766 int baud = 9600;
767 int bits = 8;
768 int parity = 'n';
769 int flow = 'n';
770
771 /*
772 * Check whether an invalid uart number has been specified, and
773 * if so, search for the first available port that does have
774 * console support.
775 */
776 if (co->index == -1 || co->index >= NR_PORTS)
777 co->index = 0;
778 sport = &sa1100_ports[co->index];
779
780 if (options)
781 uart_parse_options(options, &baud, &parity, &bits, &flow);
782 else
783 sa1100_console_get_options(sport, &baud, &parity, &bits);
784
785 return uart_set_options(&sport->port, co, baud, parity, bits, flow);
786 }
787
788 static struct uart_driver sa1100_reg;
789 static struct console sa1100_console = {
790 .name = "ttySA",
791 .write = sa1100_console_write,
792 .device = uart_console_device,
793 .setup = sa1100_console_setup,
794 .flags = CON_PRINTBUFFER,
795 .index = -1,
796 .data = &sa1100_reg,
797 };
798
799 static int __init sa1100_rs_console_init(void)
800 {
801 sa1100_init_ports();
802 register_console(&sa1100_console);
803 return 0;
804 }
805 console_initcall(sa1100_rs_console_init);
806
807 #define SA1100_CONSOLE &sa1100_console
808 #else
809 #define SA1100_CONSOLE NULL
810 #endif
811
812 static struct uart_driver sa1100_reg = {
813 .owner = THIS_MODULE,
814 .driver_name = "ttySA",
815 .dev_name = "ttySA",
816 .major = SERIAL_SA1100_MAJOR,
817 .minor = MINOR_START,
818 .nr = NR_PORTS,
819 .cons = SA1100_CONSOLE,
820 };
821
822 static int sa1100_serial_suspend(struct platform_device *dev, pm_message_t state)
823 {
824 struct sa1100_port *sport = platform_get_drvdata(dev);
825
826 if (sport)
827 uart_suspend_port(&sa1100_reg, &sport->port);
828
829 return 0;
830 }
831
832 static int sa1100_serial_resume(struct platform_device *dev)
833 {
834 struct sa1100_port *sport = platform_get_drvdata(dev);
835
836 if (sport)
837 uart_resume_port(&sa1100_reg, &sport->port);
838
839 return 0;
840 }
841
842 static int sa1100_serial_probe(struct platform_device *dev)
843 {
844 struct resource *res = dev->resource;
845 int i;
846
847 for (i = 0; i < dev->num_resources; i++, res++)
848 if (res->flags & IORESOURCE_MEM)
849 break;
850
851 if (i < dev->num_resources) {
852 for (i = 0; i < NR_PORTS; i++) {
853 if (sa1100_ports[i].port.mapbase != res->start)
854 continue;
855
856 sa1100_ports[i].port.dev = &dev->dev;
857 uart_add_one_port(&sa1100_reg, &sa1100_ports[i].port);
858 platform_set_drvdata(dev, &sa1100_ports[i]);
859 break;
860 }
861 }
862
863 return 0;
864 }
865
866 static int sa1100_serial_remove(struct platform_device *pdev)
867 {
868 struct sa1100_port *sport = platform_get_drvdata(pdev);
869
870 if (sport)
871 uart_remove_one_port(&sa1100_reg, &sport->port);
872
873 return 0;
874 }
875
876 static struct platform_driver sa11x0_serial_driver = {
877 .probe = sa1100_serial_probe,
878 .remove = sa1100_serial_remove,
879 .suspend = sa1100_serial_suspend,
880 .resume = sa1100_serial_resume,
881 .driver = {
882 .name = "sa11x0-uart",
883 .owner = THIS_MODULE,
884 },
885 };
886
887 static int __init sa1100_serial_init(void)
888 {
889 int ret;
890
891 printk(KERN_INFO "Serial: SA11x0 driver\n");
892
893 sa1100_init_ports();
894
895 ret = uart_register_driver(&sa1100_reg);
896 if (ret == 0) {
897 ret = platform_driver_register(&sa11x0_serial_driver);
898 if (ret)
899 uart_unregister_driver(&sa1100_reg);
900 }
901 return ret;
902 }
903
904 static void __exit sa1100_serial_exit(void)
905 {
906 platform_driver_unregister(&sa11x0_serial_driver);
907 uart_unregister_driver(&sa1100_reg);
908 }
909
910 module_init(sa1100_serial_init);
911 module_exit(sa1100_serial_exit);
912
913 MODULE_AUTHOR("Deep Blue Solutions Ltd");
914 MODULE_DESCRIPTION("SA1100 generic serial port driver");
915 MODULE_LICENSE("GPL");
916 MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_SA1100_MAJOR);
917 MODULE_ALIAS("platform:sa11x0-uart");
Linux kernel - Deliverables
This page took 0.147992 seconds and 5 git commands to generate.