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Linux-2.6.12-rc2
[linux-2.6/next.git] / drivers / serial / imx.c
blobd273134f9e6cc9cac5964996109350c191d0eb06
1 /*
2 * linux/drivers/serial/imx.c
3 *
4 * Driver for Motorola IMX serial ports
5 *
6 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
7 *
8 * Author: Sascha Hauer <sascha@saschahauer.de>
9 * Copyright (C) 2004 Pengutronix
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 *
25 * [29-Mar-2005] Mike Lee
26 * Added hardware handshake
27 */
28 #include <linux/config.h>
29
30 #if defined(CONFIG_SERIAL_IMX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
31 #define SUPPORT_SYSRQ
32 #endif
33
34 #include <linux/module.h>
35 #include <linux/ioport.h>
36 #include <linux/init.h>
37 #include <linux/console.h>
38 #include <linux/sysrq.h>
39 #include <linux/device.h>
40 #include <linux/tty.h>
41 #include <linux/tty_flip.h>
42 #include <linux/serial_core.h>
43 #include <linux/serial.h>
44
45 #include <asm/io.h>
46 #include <asm/irq.h>
47 #include <asm/hardware.h>
48
49 /* We've been assigned a range on the "Low-density serial ports" major */
50 #define SERIAL_IMX_MAJOR 204
51 #define MINOR_START 41
52
53 #define NR_PORTS 2
54
55 #define IMX_ISR_PASS_LIMIT 256
56
57 /*
58 * This is the size of our serial port register set.
59 */
60 #define UART_PORT_SIZE 0x100
61
62 /*
63 * This determines how often we check the modem status signals
64 * for any change. They generally aren't connected to an IRQ
65 * so we have to poll them. We also check immediately before
66 * filling the TX fifo incase CTS has been dropped.
67 */
68 #define MCTRL_TIMEOUT (250*HZ/1000)
69
70 #define DRIVER_NAME "IMX-uart"
71
72 struct imx_port {
73 struct uart_port port;
74 struct timer_list timer;
75 unsigned int old_status;
76 int txirq,rxirq;
77 };
78
79 /*
80 * Handle any change of modem status signal since we were last called.
81 */
82 static void imx_mctrl_check(struct imx_port *sport)
83 {
84 unsigned int status, changed;
85
86 status = sport->port.ops->get_mctrl(&sport->port);
87 changed = status ^ sport->old_status;
88
89 if (changed == 0)
90 return;
91
92 sport->old_status = status;
93
94 if (changed & TIOCM_RI)
95 sport->port.icount.rng++;
96 if (changed & TIOCM_DSR)
97 sport->port.icount.dsr++;
98 if (changed & TIOCM_CAR)
99 uart_handle_dcd_change(&sport->port, status & TIOCM_CAR);
100 if (changed & TIOCM_CTS)
101 uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
102
103 wake_up_interruptible(&sport->port.info->delta_msr_wait);
104 }
105
106 /*
107 * This is our per-port timeout handler, for checking the
108 * modem status signals.
109 */
110 static void imx_timeout(unsigned long data)
111 {
112 struct imx_port *sport = (struct imx_port *)data;
113 unsigned long flags;
114
115 if (sport->port.info) {
116 spin_lock_irqsave(&sport->port.lock, flags);
117 imx_mctrl_check(sport);
118 spin_unlock_irqrestore(&sport->port.lock, flags);
119
120 mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
121 }
122 }
123
124 /*
125 * interrupts disabled on entry
126 */
127 static void imx_stop_tx(struct uart_port *port, unsigned int tty_stop)
128 {
129 struct imx_port *sport = (struct imx_port *)port;
130 UCR1((u32)sport->port.membase) &= ~UCR1_TXMPTYEN;
131 }
132
133 /*
134 * interrupts disabled on entry
135 */
136 static void imx_stop_rx(struct uart_port *port)
137 {
138 struct imx_port *sport = (struct imx_port *)port;
139 UCR2((u32)sport->port.membase) &= ~UCR2_RXEN;
140 }
141
142 /*
143 * Set the modem control timer to fire immediately.
144 */
145 static void imx_enable_ms(struct uart_port *port)
146 {
147 struct imx_port *sport = (struct imx_port *)port;
148
149 mod_timer(&sport->timer, jiffies);
150 }
151
152 static inline void imx_transmit_buffer(struct imx_port *sport)
153 {
154 struct circ_buf *xmit = &sport->port.info->xmit;
155
156 do {
157 /* send xmit->buf[xmit->tail]
158 * out the port here */
159 URTX0((u32)sport->port.membase) = xmit->buf[xmit->tail];
160 xmit->tail = (xmit->tail + 1) &
161 (UART_XMIT_SIZE - 1);
162 sport->port.icount.tx++;
163 if (uart_circ_empty(xmit))
164 break;
165 } while (!(UTS((u32)sport->port.membase) & UTS_TXFULL));
166
167 if (uart_circ_empty(xmit))
168 imx_stop_tx(&sport->port, 0);
169 }
170
171 /*
172 * interrupts disabled on entry
173 */
174 static void imx_start_tx(struct uart_port *port, unsigned int tty_start)
175 {
176 struct imx_port *sport = (struct imx_port *)port;
177
178 UCR1((u32)sport->port.membase) |= UCR1_TXMPTYEN;
179
180 if(UTS((u32)sport->port.membase) & UTS_TXEMPTY)
181 imx_transmit_buffer(sport);
182 }
183
184 static irqreturn_t imx_txint(int irq, void *dev_id, struct pt_regs *regs)
185 {
186 struct imx_port *sport = (struct imx_port *)dev_id;
187 struct circ_buf *xmit = &sport->port.info->xmit;
188 unsigned long flags;
189
190 spin_lock_irqsave(&sport->port.lock,flags);
191 if (sport->port.x_char)
192 {
193 /* Send next char */
194 URTX0((u32)sport->port.membase) = sport->port.x_char;
195 goto out;
196 }
197
198 if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
199 imx_stop_tx(&sport->port, 0);
200 goto out;
201 }
202
203 imx_transmit_buffer(sport);
204
205 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
206 uart_write_wakeup(&sport->port);
207
208 out:
209 spin_unlock_irqrestore(&sport->port.lock,flags);
210 return IRQ_HANDLED;
211 }
212
213 static irqreturn_t imx_rxint(int irq, void *dev_id, struct pt_regs *regs)
214 {
215 struct imx_port *sport = dev_id;
216 unsigned int rx,flg,ignored = 0;
217 struct tty_struct *tty = sport->port.info->tty;
218 unsigned long flags;
219
220 rx = URXD0((u32)sport->port.membase);
221 spin_lock_irqsave(&sport->port.lock,flags);
222
223 do {
224 flg = TTY_NORMAL;
225 sport->port.icount.rx++;
226
227 if( USR2((u32)sport->port.membase) & USR2_BRCD ) {
228 USR2((u32)sport->port.membase) |= USR2_BRCD;
229 if(uart_handle_break(&sport->port))
230 goto ignore_char;
231 }
232
233 if (uart_handle_sysrq_char
234 (&sport->port, (unsigned char)rx, regs))
235 goto ignore_char;
236
237 if( rx & (URXD_PRERR | URXD_OVRRUN | URXD_FRMERR) )
238 goto handle_error;
239
240 error_return:
241 tty_insert_flip_char(tty, rx, flg);
242
243 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
244 goto out;
245
246 ignore_char:
247 rx = URXD0((u32)sport->port.membase);
248 } while(rx & URXD_CHARRDY);
249
250 out:
251 spin_unlock_irqrestore(&sport->port.lock,flags);
252 tty_flip_buffer_push(tty);
253 return IRQ_HANDLED;
254
255 handle_error:
256 if (rx & URXD_PRERR)
257 sport->port.icount.parity++;
258 else if (rx & URXD_FRMERR)
259 sport->port.icount.frame++;
260 if (rx & URXD_OVRRUN)
261 sport->port.icount.overrun++;
262
263 if (rx & sport->port.ignore_status_mask) {
264 if (++ignored > 100)
265 goto out;
266 goto ignore_char;
267 }
268
269 rx &= sport->port.read_status_mask;
270
271 if (rx & URXD_PRERR)
272 flg = TTY_PARITY;
273 else if (rx & URXD_FRMERR)
274 flg = TTY_FRAME;
275 if (rx & URXD_OVRRUN)
276 flg = TTY_OVERRUN;
277
278 #ifdef SUPPORT_SYSRQ
279 sport->port.sysrq = 0;
280 #endif
281 goto error_return;
282 }
283
284 /*
285 * Return TIOCSER_TEMT when transmitter is not busy.
286 */
287 static unsigned int imx_tx_empty(struct uart_port *port)
288 {
289 struct imx_port *sport = (struct imx_port *)port;
290
291 return USR2((u32)sport->port.membase) & USR2_TXDC ? TIOCSER_TEMT : 0;
292 }
293
294 static unsigned int imx_get_mctrl(struct uart_port *port)
295 {
296 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
297 }
298
299 static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl)
300 {
301 }
302
303 /*
304 * Interrupts always disabled.
305 */
306 static void imx_break_ctl(struct uart_port *port, int break_state)
307 {
308 struct imx_port *sport = (struct imx_port *)port;
309 unsigned long flags;
310
311 spin_lock_irqsave(&sport->port.lock, flags);
312
313 if ( break_state != 0 )
314 UCR1((u32)sport->port.membase) |= UCR1_SNDBRK;
315 else
316 UCR1((u32)sport->port.membase) &= ~UCR1_SNDBRK;
317
318 spin_unlock_irqrestore(&sport->port.lock, flags);
319 }
320
321 #define TXTL 2 /* reset default */
322 #define RXTL 1 /* reset default */
323
324 static int imx_startup(struct uart_port *port)
325 {
326 struct imx_port *sport = (struct imx_port *)port;
327 int retval;
328 unsigned int val;
329 unsigned long flags;
330
331 /* set receiver / transmitter trigger level. We assume
332 * that RFDIV has been set by the arch setup or by the bootloader.
333 */
334 val = (UFCR((u32)sport->port.membase) & UFCR_RFDIV) | TXTL<<10 | RXTL;
335 UFCR((u32)sport->port.membase) = val;
336
337 /* disable the DREN bit (Data Ready interrupt enable) before
338 * requesting IRQs
339 */
340 UCR4((u32)sport->port.membase) &= ~UCR4_DREN;
341
342 /*
343 * Allocate the IRQ
344 */
345 retval = request_irq(sport->rxirq, imx_rxint, 0,
346 DRIVER_NAME, sport);
347 if (retval) goto error_out2;
348
349 retval = request_irq(sport->txirq, imx_txint, 0,
350 "imx-uart", sport);
351 if (retval) goto error_out1;
352
353 /*
354 * Finally, clear and enable interrupts
355 */
356
357 UCR1((u32)sport->port.membase) |=
358 (UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_UARTEN);
359
360 UCR2((u32)sport->port.membase) |= (UCR2_RXEN | UCR2_TXEN);
361 /*
362 * Enable modem status interrupts
363 */
364 spin_lock_irqsave(&sport->port.lock,flags);
365 imx_enable_ms(&sport->port);
366 spin_unlock_irqrestore(&sport->port.lock,flags);
367
368 return 0;
369
370 error_out1:
371 free_irq(sport->rxirq, sport);
372 error_out2:
373 free_irq(sport->txirq, sport);
374 return retval;
375 }
376
377 static void imx_shutdown(struct uart_port *port)
378 {
379 struct imx_port *sport = (struct imx_port *)port;
380
381 /*
382 * Stop our timer.
383 */
384 del_timer_sync(&sport->timer);
385
386 /*
387 * Free the interrupts
388 */
389 free_irq(sport->txirq, sport);
390 free_irq(sport->rxirq, sport);
391
392 /*
393 * Disable all interrupts, port and break condition.
394 */
395
396 UCR1((u32)sport->port.membase) &=
397 ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_UARTEN);
398 }
399
400 static void
401 imx_set_termios(struct uart_port *port, struct termios *termios,
402 struct termios *old)
403 {
404 struct imx_port *sport = (struct imx_port *)port;
405 unsigned long flags;
406 unsigned int ucr2, old_ucr1, old_txrxen, baud, quot;
407 unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
408
409 /*
410 * If we don't support modem control lines, don't allow
411 * these to be set.
412 */
413 if (0) {
414 termios->c_cflag &= ~(HUPCL | CRTSCTS | CMSPAR);
415 termios->c_cflag |= CLOCAL;
416 }
417
418 /*
419 * We only support CS7 and CS8.
420 */
421 while ((termios->c_cflag & CSIZE) != CS7 &&
422 (termios->c_cflag & CSIZE) != CS8) {
423 termios->c_cflag &= ~CSIZE;
424 termios->c_cflag |= old_csize;
425 old_csize = CS8;
426 }
427
428 if ((termios->c_cflag & CSIZE) == CS8)
429 ucr2 = UCR2_WS | UCR2_SRST | UCR2_IRTS;
430 else
431 ucr2 = UCR2_SRST | UCR2_IRTS;
432
433 if (termios->c_cflag & CRTSCTS) {
434 ucr2 &= ~UCR2_IRTS;
435 ucr2 |= UCR2_CTSC;
436 }
437
438 if (termios->c_cflag & CSTOPB)
439 ucr2 |= UCR2_STPB;
440 if (termios->c_cflag & PARENB) {
441 ucr2 |= UCR2_PREN;
442 if (!(termios->c_cflag & PARODD))
443 ucr2 |= UCR2_PROE;
444 }
445
446 /*
447 * Ask the core to calculate the divisor for us.
448 */
449 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
450 quot = uart_get_divisor(port, baud);
451
452 spin_lock_irqsave(&sport->port.lock, flags);
453
454 sport->port.read_status_mask = 0;
455 if (termios->c_iflag & INPCK)
456 sport->port.read_status_mask |= (URXD_FRMERR | URXD_PRERR);
457 if (termios->c_iflag & (BRKINT | PARMRK))
458 sport->port.read_status_mask |= URXD_BRK;
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 |= URXD_PRERR;
466 if (termios->c_iflag & IGNBRK) {
467 sport->port.ignore_status_mask |= URXD_BRK;
468 /*
469 * If we're ignoring parity and break indicators,
470 * ignore overruns too (for real raw support).
471 */
472 if (termios->c_iflag & IGNPAR)
473 sport->port.ignore_status_mask |= URXD_OVRRUN;
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_ucr1 = UCR1((u32)sport->port.membase);
487 UCR1((u32)sport->port.membase) &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN);
488
489 while ( !(USR2((u32)sport->port.membase) & USR2_TXDC))
490 barrier();
491
492 /* then, disable everything */
493 old_txrxen = UCR2((u32)sport->port.membase) & ( UCR2_TXEN | UCR2_RXEN );
494 UCR2((u32)sport->port.membase) &= ~( UCR2_TXEN | UCR2_RXEN);
495
496 /* set the parity, stop bits and data size */
497 UCR2((u32)sport->port.membase) = ucr2;
498
499 /* set the baud rate. We assume uartclk = 16 MHz
500 *
501 * baud * 16 UBIR - 1
502 * --------- = --------
503 * uartclk UBMR - 1
504 */
505 UBIR((u32)sport->port.membase) = (baud / 100) - 1;
506 UBMR((u32)sport->port.membase) = 10000 - 1;
507
508 UCR1((u32)sport->port.membase) = old_ucr1;
509 UCR2((u32)sport->port.membase) |= old_txrxen;
510
511 if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
512 imx_enable_ms(&sport->port);
513
514 spin_unlock_irqrestore(&sport->port.lock, flags);
515 }
516
517 static const char *imx_type(struct uart_port *port)
518 {
519 struct imx_port *sport = (struct imx_port *)port;
520
521 return sport->port.type == PORT_IMX ? "IMX" : NULL;
522 }
523
524 /*
525 * Release the memory region(s) being used by 'port'.
526 */
527 static void imx_release_port(struct uart_port *port)
528 {
529 struct imx_port *sport = (struct imx_port *)port;
530
531 release_mem_region(sport->port.mapbase, UART_PORT_SIZE);
532 }
533
534 /*
535 * Request the memory region(s) being used by 'port'.
536 */
537 static int imx_request_port(struct uart_port *port)
538 {
539 struct imx_port *sport = (struct imx_port *)port;
540
541 return request_mem_region(sport->port.mapbase, UART_PORT_SIZE,
542 "imx-uart") != NULL ? 0 : -EBUSY;
543 }
544
545 /*
546 * Configure/autoconfigure the port.
547 */
548 static void imx_config_port(struct uart_port *port, int flags)
549 {
550 struct imx_port *sport = (struct imx_port *)port;
551
552 if (flags & UART_CONFIG_TYPE &&
553 imx_request_port(&sport->port) == 0)
554 sport->port.type = PORT_IMX;
555 }
556
557 /*
558 * Verify the new serial_struct (for TIOCSSERIAL).
559 * The only change we allow are to the flags and type, and
560 * even then only between PORT_IMX and PORT_UNKNOWN
561 */
562 static int
563 imx_verify_port(struct uart_port *port, struct serial_struct *ser)
564 {
565 struct imx_port *sport = (struct imx_port *)port;
566 int ret = 0;
567
568 if (ser->type != PORT_UNKNOWN && ser->type != PORT_IMX)
569 ret = -EINVAL;
570 if (sport->port.irq != ser->irq)
571 ret = -EINVAL;
572 if (ser->io_type != UPIO_MEM)
573 ret = -EINVAL;
574 if (sport->port.uartclk / 16 != ser->baud_base)
575 ret = -EINVAL;
576 if ((void *)sport->port.mapbase != ser->iomem_base)
577 ret = -EINVAL;
578 if (sport->port.iobase != ser->port)
579 ret = -EINVAL;
580 if (ser->hub6 != 0)
581 ret = -EINVAL;
582 return ret;
583 }
584
585 static struct uart_ops imx_pops = {
586 .tx_empty = imx_tx_empty,
587 .set_mctrl = imx_set_mctrl,
588 .get_mctrl = imx_get_mctrl,
589 .stop_tx = imx_stop_tx,
590 .start_tx = imx_start_tx,
591 .stop_rx = imx_stop_rx,
592 .enable_ms = imx_enable_ms,
593 .break_ctl = imx_break_ctl,
594 .startup = imx_startup,
595 .shutdown = imx_shutdown,
596 .set_termios = imx_set_termios,
597 .type = imx_type,
598 .release_port = imx_release_port,
599 .request_port = imx_request_port,
600 .config_port = imx_config_port,
601 .verify_port = imx_verify_port,
602 };
603
604 static struct imx_port imx_ports[] = {
605 {
606 .txirq = UART1_MINT_TX,
607 .rxirq = UART1_MINT_RX,
608 .port = {
609 .type = PORT_IMX,
610 .iotype = SERIAL_IO_MEM,
611 .membase = (void *)IMX_UART1_BASE,
612 .mapbase = IMX_UART1_BASE, /* FIXME */
613 .irq = UART1_MINT_RX,
614 .uartclk = 16000000,
615 .fifosize = 8,
616 .flags = ASYNC_BOOT_AUTOCONF,
617 .ops = &imx_pops,
618 .line = 0,
619 },
620 }, {
621 .txirq = UART2_MINT_TX,
622 .rxirq = UART2_MINT_RX,
623 .port = {
624 .type = PORT_IMX,
625 .iotype = SERIAL_IO_MEM,
626 .membase = (void *)IMX_UART2_BASE,
627 .mapbase = IMX_UART2_BASE, /* FIXME */
628 .irq = UART2_MINT_RX,
629 .uartclk = 16000000,
630 .fifosize = 8,
631 .flags = ASYNC_BOOT_AUTOCONF,
632 .ops = &imx_pops,
633 .line = 1,
634 },
635 }
636 };
637
638 /*
639 * Setup the IMX serial ports.
640 * Note also that we support "console=ttySMXx" where "x" is either 0 or 1.
641 * Which serial port this ends up being depends on the machine you're
642 * running this kernel on. I'm not convinced that this is a good idea,
643 * but that's the way it traditionally works.
644 *
645 */
646 static void __init imx_init_ports(void)
647 {
648 static int first = 1;
649 int i;
650
651 if (!first)
652 return;
653 first = 0;
654
655 for (i = 0; i < ARRAY_SIZE(imx_ports); i++) {
656 init_timer(&imx_ports[i].timer);
657 imx_ports[i].timer.function = imx_timeout;
658 imx_ports[i].timer.data = (unsigned long)&imx_ports[i];
659 }
660
661 imx_gpio_mode(PC9_PF_UART1_CTS);
662 imx_gpio_mode(PC10_PF_UART1_RTS);
663 imx_gpio_mode(PC11_PF_UART1_TXD);
664 imx_gpio_mode(PC12_PF_UART1_RXD);
665 imx_gpio_mode(PB28_PF_UART2_CTS);
666 imx_gpio_mode(PB29_PF_UART2_RTS);
667
668 imx_gpio_mode(PB30_PF_UART2_TXD);
669 imx_gpio_mode(PB31_PF_UART2_RXD);
670
671 #if 0 /* We don't need these, on the mx1 the _modem_ side of the uart
672 * is implemented.
673 */
674 imx_gpio_mode(PD7_AF_UART2_DTR);
675 imx_gpio_mode(PD8_AF_UART2_DCD);
676 imx_gpio_mode(PD9_AF_UART2_RI);
677 imx_gpio_mode(PD10_AF_UART2_DSR);
678 #endif
679
680
681 }
682
683 #ifdef CONFIG_SERIAL_IMX_CONSOLE
684
685 /*
686 * Interrupts are disabled on entering
687 */
688 static void
689 imx_console_write(struct console *co, const char *s, unsigned int count)
690 {
691 struct imx_port *sport = &imx_ports[co->index];
692 unsigned int old_ucr1, old_ucr2, i;
693
694 /*
695 * First, save UCR1/2 and then disable interrupts
696 */
697 old_ucr1 = UCR1((u32)sport->port.membase);
698 old_ucr2 = UCR2((u32)sport->port.membase);
699
700 UCR1((u32)sport->port.membase) =
701 (old_ucr1 | UCR1_UARTCLKEN | UCR1_UARTEN)
702 & ~(UCR1_TXMPTYEN | UCR1_RRDYEN);
703 UCR2((u32)sport->port.membase) = old_ucr2 | UCR2_TXEN;
704
705 /*
706 * Now, do each character
707 */
708 for (i = 0; i < count; i++) {
709
710 while ((UTS((u32)sport->port.membase) & UTS_TXFULL))
711 barrier();
712
713 URTX0((u32)sport->port.membase) = s[i];
714
715 if (s[i] == '\n') {
716 while ((UTS((u32)sport->port.membase) & UTS_TXFULL))
717 barrier();
718 URTX0((u32)sport->port.membase) = '\r';
719 }
720 }
721
722 /*
723 * Finally, wait for transmitter to become empty
724 * and restore UCR1/2
725 */
726 while (!(USR2((u32)sport->port.membase) & USR2_TXDC));
727
728 UCR1((u32)sport->port.membase) = old_ucr1;
729 UCR2((u32)sport->port.membase) = old_ucr2;
730 }
731
732 /*
733 * If the port was already initialised (eg, by a boot loader),
734 * try to determine the current setup.
735 */
736 static void __init
737 imx_console_get_options(struct imx_port *sport, int *baud,
738 int *parity, int *bits)
739 {
740 if ( UCR1((u32)sport->port.membase) | UCR1_UARTEN ) {
741 /* ok, the port was enabled */
742 unsigned int ucr2, ubir,ubmr, uartclk;
743
744 ucr2 = UCR2((u32)sport->port.membase);
745
746 *parity = 'n';
747 if (ucr2 & UCR2_PREN) {
748 if (ucr2 & UCR2_PROE)
749 *parity = 'o';
750 else
751 *parity = 'e';
752 }
753
754 if (ucr2 & UCR2_WS)
755 *bits = 8;
756 else
757 *bits = 7;
758
759 ubir = UBIR((u32)sport->port.membase) & 0xffff;
760 ubmr = UBMR((u32)sport->port.membase) & 0xffff;
761 uartclk = sport->port.uartclk;
762
763 *baud = ((uartclk/16) * (ubir + 1)) / (ubmr + 1);
764 }
765 }
766
767 static int __init
768 imx_console_setup(struct console *co, char *options)
769 {
770 struct imx_port *sport;
771 int baud = 9600;
772 int bits = 8;
773 int parity = 'n';
774 int flow = 'n';
775
776 /*
777 * Check whether an invalid uart number has been specified, and
778 * if so, search for the first available port that does have
779 * console support.
780 */
781 if (co->index == -1 || co->index >= ARRAY_SIZE(imx_ports))
782 co->index = 0;
783 sport = &imx_ports[co->index];
784
785 if (options)
786 uart_parse_options(options, &baud, &parity, &bits, &flow);
787 else
788 imx_console_get_options(sport, &baud, &parity, &bits);
789
790 return uart_set_options(&sport->port, co, baud, parity, bits, flow);
791 }
792
793 extern struct uart_driver imx_reg;
794 static struct console imx_console = {
795 .name = "ttySMX",
796 .write = imx_console_write,
797 .device = uart_console_device,
798 .setup = imx_console_setup,
799 .flags = CON_PRINTBUFFER,
800 .index = -1,
801 .data = &imx_reg,
802 };
803
804 static int __init imx_rs_console_init(void)
805 {
806 imx_init_ports();
807 register_console(&imx_console);
808 return 0;
809 }
810 console_initcall(imx_rs_console_init);
811
812 #define IMX_CONSOLE &imx_console
813 #else
814 #define IMX_CONSOLE NULL
815 #endif
816
817 static struct uart_driver imx_reg = {
818 .owner = THIS_MODULE,
819 .driver_name = DRIVER_NAME,
820 .dev_name = "ttySMX",
821 .devfs_name = "ttsmx/",
822 .major = SERIAL_IMX_MAJOR,
823 .minor = MINOR_START,
824 .nr = ARRAY_SIZE(imx_ports),
825 .cons = IMX_CONSOLE,
826 };
827
828 static int serial_imx_suspend(struct device *_dev, u32 state, u32 level)
829 {
830 struct imx_port *sport = dev_get_drvdata(_dev);
831
832 if (sport && level == SUSPEND_DISABLE)
833 uart_suspend_port(&imx_reg, &sport->port);
834
835 return 0;
836 }
837
838 static int serial_imx_resume(struct device *_dev, u32 level)
839 {
840 struct imx_port *sport = dev_get_drvdata(_dev);
841
842 if (sport && level == RESUME_ENABLE)
843 uart_resume_port(&imx_reg, &sport->port);
844
845 return 0;
846 }
847
848 static int serial_imx_probe(struct device *_dev)
849 {
850 struct platform_device *dev = to_platform_device(_dev);
851
852 imx_ports[dev->id].port.dev = _dev;
853 uart_add_one_port(&imx_reg, &imx_ports[dev->id].port);
854 dev_set_drvdata(_dev, &imx_ports[dev->id]);
855 return 0;
856 }
857
858 static int serial_imx_remove(struct device *_dev)
859 {
860 struct imx_port *sport = dev_get_drvdata(_dev);
861
862 dev_set_drvdata(_dev, NULL);
863
864 if (sport)
865 uart_remove_one_port(&imx_reg, &sport->port);
866
867 return 0;
868 }
869
870 static struct device_driver serial_imx_driver = {
871 .name = "imx-uart",
872 .bus = &platform_bus_type,
873 .probe = serial_imx_probe,
874 .remove = serial_imx_remove,
875
876 .suspend = serial_imx_suspend,
877 .resume = serial_imx_resume,
878 };
879
880 static int __init imx_serial_init(void)
881 {
882 int ret;
883
884 printk(KERN_INFO "Serial: IMX driver\n");
885
886 imx_init_ports();
887
888 ret = uart_register_driver(&imx_reg);
889 if (ret)
890 return ret;
891
892 ret = driver_register(&serial_imx_driver);
893 if (ret != 0)
894 uart_unregister_driver(&imx_reg);
895
896 return 0;
897 }
898
899 static void __exit imx_serial_exit(void)
900 {
901 uart_unregister_driver(&imx_reg);
902 }
903
904 module_init(imx_serial_init);
905 module_exit(imx_serial_exit);
906
907 MODULE_AUTHOR("Sascha Hauer");
908 MODULE_DESCRIPTION("IMX generic serial port driver");
909 MODULE_LICENSE("GPL");
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