blob: 61dd17d7bacefd0a777ad107dd75869c71b3a319 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * drivers/serial/mpc52xx_uart.c
3 *
4 * Driver for the PSC of the Freescale MPC52xx PSCs configured as UARTs.
5 *
6 * FIXME According to the usermanual the status bits in the status register
7 * are only updated when the peripherals access the FIFO and not when the
8 * CPU access them. So since we use this bits to know when we stop writing
9 * and reading, they may not be updated in-time and a race condition may
10 * exists. But I haven't be able to prove this and I don't care. But if
11 * any problem arises, it might worth checking. The TX/RX FIFO Stats
12 * registers should be used in addition.
13 * Update: Actually, they seem updated ... At least the bits we use.
14 *
15 *
16 * Maintainer : Sylvain Munaut <tnt@246tNt.com>
17 *
18 * Some of the code has been inspired/copied from the 2.4 code written
19 * by Dale Farnsworth <dfarnsworth@mvista.com>.
20 *
21 * Copyright (C) 2004-2005 Sylvain Munaut <tnt@246tNt.com>
22 * Copyright (C) 2003 MontaVista, Software, Inc.
23 *
24 * This file is licensed under the terms of the GNU General Public License
25 * version 2. This program is licensed "as is" without any warranty of any
26 * kind, whether express or implied.
27 */
28
29/* Platform device Usage :
30 *
31 * Since PSCs can have multiple function, the correct driver for each one
32 * is selected by calling mpc52xx_match_psc_function(...). The function
33 * handled by this driver is "uart".
34 *
35 * The driver init all necessary registers to place the PSC in uart mode without
36 * DCD. However, the pin multiplexing aren't changed and should be set either
37 * by the bootloader or in the platform init code.
38 *
39 * The idx field must be equal to the PSC index ( e.g. 0 for PSC1, 1 for PSC2,
Sylvain Munautd62de3a2006-01-06 00:11:32 -080040 * and so on). So the PSC1 is mapped to /dev/ttyPSC0, PSC2 to /dev/ttyPSC1 and
41 * so on. But be warned, it's an ABSOLUTE REQUIREMENT ! This is needed mainly
42 * fpr the console code : without this 1:1 mapping, at early boot time, when we
43 * are parsing the kernel args console=ttyPSC?, we wouldn't know wich PSC it
44 * will be mapped to.
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 */
46
47#include <linux/config.h>
Russell Kingd052d1b2005-10-29 19:07:23 +010048#include <linux/platform_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <linux/module.h>
50#include <linux/tty.h>
51#include <linux/serial.h>
52#include <linux/sysrq.h>
53#include <linux/console.h>
54
55#include <asm/delay.h>
56#include <asm/io.h>
57
58#include <asm/mpc52xx.h>
59#include <asm/mpc52xx_psc.h>
60
61#if defined(CONFIG_SERIAL_MPC52xx_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
62#define SUPPORT_SYSRQ
63#endif
64
65#include <linux/serial_core.h>
66
67
Sylvain Munautd62de3a2006-01-06 00:11:32 -080068/* We've been assigned a range on the "Low-density serial ports" major */
69#define SERIAL_PSC_MAJOR 204
70#define SERIAL_PSC_MINOR 148
71
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73#define ISR_PASS_LIMIT 256 /* Max number of iteration in the interrupt */
74
75
76static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM];
77 /* Rem: - We use the read_status_mask as a shadow of
78 * psc->mpc52xx_psc_imr
79 * - It's important that is array is all zero on start as we
80 * use it to know if it's initialized or not ! If it's not sure
81 * it's cleared, then a memset(...,0,...) should be added to
82 * the console_init
83 */
84
85#define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase))
86
87
88/* Forward declaration of the interruption handling routine */
89static irqreturn_t mpc52xx_uart_int(int irq,void *dev_id,struct pt_regs *regs);
90
91
92/* Simple macro to test if a port is console or not. This one is taken
93 * for serial_core.c and maybe should be moved to serial_core.h ? */
94#ifdef CONFIG_SERIAL_CORE_CONSOLE
95#define uart_console(port) ((port)->cons && (port)->cons->index == (port)->line)
96#else
97#define uart_console(port) (0)
98#endif
99
100
101/* ======================================================================== */
102/* UART operations */
103/* ======================================================================== */
104
105static unsigned int
106mpc52xx_uart_tx_empty(struct uart_port *port)
107{
108 int status = in_be16(&PSC(port)->mpc52xx_psc_status);
109 return (status & MPC52xx_PSC_SR_TXEMP) ? TIOCSER_TEMT : 0;
110}
111
112static void
113mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
114{
115 /* Not implemented */
116}
117
118static unsigned int
119mpc52xx_uart_get_mctrl(struct uart_port *port)
120{
121 /* Not implemented */
122 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
123}
124
125static void
Russell Kingb129a8c2005-08-31 10:12:14 +0100126mpc52xx_uart_stop_tx(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127{
128 /* port->lock taken by caller */
129 port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY;
130 out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask);
131}
132
133static void
Russell Kingb129a8c2005-08-31 10:12:14 +0100134mpc52xx_uart_start_tx(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
136 /* port->lock taken by caller */
137 port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
138 out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask);
139}
140
141static void
142mpc52xx_uart_send_xchar(struct uart_port *port, char ch)
143{
144 unsigned long flags;
145 spin_lock_irqsave(&port->lock, flags);
146
147 port->x_char = ch;
148 if (ch) {
149 /* Make sure tx interrupts are on */
150 /* Truly necessary ??? They should be anyway */
151 port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
152 out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask);
153 }
154
155 spin_unlock_irqrestore(&port->lock, flags);
156}
157
158static void
159mpc52xx_uart_stop_rx(struct uart_port *port)
160{
161 /* port->lock taken by caller */
162 port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY;
163 out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask);
164}
165
166static void
167mpc52xx_uart_enable_ms(struct uart_port *port)
168{
169 /* Not implemented */
170}
171
172static void
173mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
174{
175 unsigned long flags;
176 spin_lock_irqsave(&port->lock, flags);
177
178 if ( ctl == -1 )
179 out_8(&PSC(port)->command,MPC52xx_PSC_START_BRK);
180 else
181 out_8(&PSC(port)->command,MPC52xx_PSC_STOP_BRK);
182
183 spin_unlock_irqrestore(&port->lock, flags);
184}
185
186static int
187mpc52xx_uart_startup(struct uart_port *port)
188{
189 struct mpc52xx_psc __iomem *psc = PSC(port);
190 int ret;
191
192 /* Request IRQ */
193 ret = request_irq(port->irq, mpc52xx_uart_int,
194 SA_INTERRUPT | SA_SAMPLE_RANDOM, "mpc52xx_psc_uart", port);
195 if (ret)
196 return ret;
197
198 /* Reset/activate the port, clear and enable interrupts */
199 out_8(&psc->command,MPC52xx_PSC_RST_RX);
200 out_8(&psc->command,MPC52xx_PSC_RST_TX);
201
202 out_be32(&psc->sicr,0); /* UART mode DCD ignored */
203
204 out_be16(&psc->mpc52xx_psc_clock_select, 0xdd00); /* /16 prescaler on */
205
206 out_8(&psc->rfcntl, 0x00);
207 out_be16(&psc->rfalarm, 0x1ff);
208 out_8(&psc->tfcntl, 0x07);
209 out_be16(&psc->tfalarm, 0x80);
210
211 port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY;
212 out_be16(&psc->mpc52xx_psc_imr,port->read_status_mask);
213
214 out_8(&psc->command,MPC52xx_PSC_TX_ENABLE);
215 out_8(&psc->command,MPC52xx_PSC_RX_ENABLE);
216
217 return 0;
218}
219
220static void
221mpc52xx_uart_shutdown(struct uart_port *port)
222{
223 struct mpc52xx_psc __iomem *psc = PSC(port);
224
225 /* Shut down the port, interrupt and all */
226 out_8(&psc->command,MPC52xx_PSC_RST_RX);
227 out_8(&psc->command,MPC52xx_PSC_RST_TX);
228
229 port->read_status_mask = 0;
230 out_be16(&psc->mpc52xx_psc_imr,port->read_status_mask);
231
232 /* Release interrupt */
233 free_irq(port->irq, port);
234}
235
236static void
237mpc52xx_uart_set_termios(struct uart_port *port, struct termios *new,
238 struct termios *old)
239{
240 struct mpc52xx_psc __iomem *psc = PSC(port);
241 unsigned long flags;
242 unsigned char mr1, mr2;
243 unsigned short ctr;
244 unsigned int j, baud, quot;
245
246 /* Prepare what we're gonna write */
247 mr1 = 0;
248
249 switch (new->c_cflag & CSIZE) {
250 case CS5: mr1 |= MPC52xx_PSC_MODE_5_BITS;
251 break;
252 case CS6: mr1 |= MPC52xx_PSC_MODE_6_BITS;
253 break;
254 case CS7: mr1 |= MPC52xx_PSC_MODE_7_BITS;
255 break;
256 case CS8:
257 default: mr1 |= MPC52xx_PSC_MODE_8_BITS;
258 }
259
260 if (new->c_cflag & PARENB) {
261 mr1 |= (new->c_cflag & PARODD) ?
262 MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
263 } else
264 mr1 |= MPC52xx_PSC_MODE_PARNONE;
265
266
267 mr2 = 0;
268
269 if (new->c_cflag & CSTOPB)
270 mr2 |= MPC52xx_PSC_MODE_TWO_STOP;
271 else
272 mr2 |= ((new->c_cflag & CSIZE) == CS5) ?
273 MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
274 MPC52xx_PSC_MODE_ONE_STOP;
275
276
277 baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
278 quot = uart_get_divisor(port, baud);
279 ctr = quot & 0xffff;
280
281 /* Get the lock */
282 spin_lock_irqsave(&port->lock, flags);
283
284 /* Update the per-port timeout */
285 uart_update_timeout(port, new->c_cflag, baud);
286
287 /* Do our best to flush TX & RX, so we don't loose anything */
288 /* But we don't wait indefinitly ! */
289 j = 5000000; /* Maximum wait */
290 /* FIXME Can't receive chars since set_termios might be called at early
291 * boot for the console, all stuff is not yet ready to receive at that
292 * time and that just makes the kernel oops */
293 /* while (j-- && mpc52xx_uart_int_rx_chars(port)); */
294 while (!(in_be16(&psc->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXEMP) &&
295 --j)
296 udelay(1);
297
298 if (!j)
299 printk( KERN_ERR "mpc52xx_uart.c: "
300 "Unable to flush RX & TX fifos in-time in set_termios."
301 "Some chars may have been lost.\n" );
302
303 /* Reset the TX & RX */
304 out_8(&psc->command,MPC52xx_PSC_RST_RX);
305 out_8(&psc->command,MPC52xx_PSC_RST_TX);
306
307 /* Send new mode settings */
308 out_8(&psc->command,MPC52xx_PSC_SEL_MODE_REG_1);
309 out_8(&psc->mode,mr1);
310 out_8(&psc->mode,mr2);
311 out_8(&psc->ctur,ctr >> 8);
312 out_8(&psc->ctlr,ctr & 0xff);
313
314 /* Reenable TX & RX */
315 out_8(&psc->command,MPC52xx_PSC_TX_ENABLE);
316 out_8(&psc->command,MPC52xx_PSC_RX_ENABLE);
317
318 /* We're all set, release the lock */
319 spin_unlock_irqrestore(&port->lock, flags);
320}
321
322static const char *
323mpc52xx_uart_type(struct uart_port *port)
324{
325 return port->type == PORT_MPC52xx ? "MPC52xx PSC" : NULL;
326}
327
328static void
329mpc52xx_uart_release_port(struct uart_port *port)
330{
331 if (port->flags & UPF_IOREMAP) { /* remapped by us ? */
332 iounmap(port->membase);
333 port->membase = NULL;
334 }
335
336 release_mem_region(port->mapbase, MPC52xx_PSC_SIZE);
337}
338
339static int
340mpc52xx_uart_request_port(struct uart_port *port)
341{
342 if (port->flags & UPF_IOREMAP) /* Need to remap ? */
343 port->membase = ioremap(port->mapbase, MPC52xx_PSC_SIZE);
344
345 if (!port->membase)
346 return -EINVAL;
347
348 return request_mem_region(port->mapbase, MPC52xx_PSC_SIZE,
349 "mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
350}
351
352static void
353mpc52xx_uart_config_port(struct uart_port *port, int flags)
354{
355 if ( (flags & UART_CONFIG_TYPE) &&
356 (mpc52xx_uart_request_port(port) == 0) )
357 port->type = PORT_MPC52xx;
358}
359
360static int
361mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
362{
363 if ( ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx )
364 return -EINVAL;
365
366 if ( (ser->irq != port->irq) ||
367 (ser->io_type != SERIAL_IO_MEM) ||
368 (ser->baud_base != port->uartclk) ||
369 (ser->iomem_base != (void*)port->mapbase) ||
370 (ser->hub6 != 0 ) )
371 return -EINVAL;
372
373 return 0;
374}
375
376
377static struct uart_ops mpc52xx_uart_ops = {
378 .tx_empty = mpc52xx_uart_tx_empty,
379 .set_mctrl = mpc52xx_uart_set_mctrl,
380 .get_mctrl = mpc52xx_uart_get_mctrl,
381 .stop_tx = mpc52xx_uart_stop_tx,
382 .start_tx = mpc52xx_uart_start_tx,
383 .send_xchar = mpc52xx_uart_send_xchar,
384 .stop_rx = mpc52xx_uart_stop_rx,
385 .enable_ms = mpc52xx_uart_enable_ms,
386 .break_ctl = mpc52xx_uart_break_ctl,
387 .startup = mpc52xx_uart_startup,
388 .shutdown = mpc52xx_uart_shutdown,
389 .set_termios = mpc52xx_uart_set_termios,
390/* .pm = mpc52xx_uart_pm, Not supported yet */
391/* .set_wake = mpc52xx_uart_set_wake, Not supported yet */
392 .type = mpc52xx_uart_type,
393 .release_port = mpc52xx_uart_release_port,
394 .request_port = mpc52xx_uart_request_port,
395 .config_port = mpc52xx_uart_config_port,
396 .verify_port = mpc52xx_uart_verify_port
397};
398
399
400/* ======================================================================== */
401/* Interrupt handling */
402/* ======================================================================== */
403
404static inline int
405mpc52xx_uart_int_rx_chars(struct uart_port *port, struct pt_regs *regs)
406{
407 struct tty_struct *tty = port->info->tty;
Alan Cox33f0f882006-01-09 20:54:13 -0800408 unsigned char ch, flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 unsigned short status;
410
411 /* While we can read, do so ! */
412 while ( (status = in_be16(&PSC(port)->mpc52xx_psc_status)) &
413 MPC52xx_PSC_SR_RXRDY) {
414
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 /* Get the char */
416 ch = in_8(&PSC(port)->mpc52xx_psc_buffer_8);
417
418 /* Handle sysreq char */
419#ifdef SUPPORT_SYSRQ
420 if (uart_handle_sysrq_char(port, ch, regs)) {
421 port->sysrq = 0;
422 continue;
423 }
424#endif
425
426 /* Store it */
Alan Cox33f0f882006-01-09 20:54:13 -0800427
428 flag = TTY_NORMAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 port->icount.rx++;
430
431 if ( status & (MPC52xx_PSC_SR_PE |
432 MPC52xx_PSC_SR_FE |
Alan Cox33f0f882006-01-09 20:54:13 -0800433 MPC52xx_PSC_SR_RB) ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434
435 if (status & MPC52xx_PSC_SR_RB) {
Alan Cox33f0f882006-01-09 20:54:13 -0800436 flag = TTY_BREAK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 uart_handle_break(port);
438 } else if (status & MPC52xx_PSC_SR_PE)
Alan Cox33f0f882006-01-09 20:54:13 -0800439 flag = TTY_PARITY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 else if (status & MPC52xx_PSC_SR_FE)
Alan Cox33f0f882006-01-09 20:54:13 -0800441 flag = TTY_FRAME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
443 /* Clear error condition */
444 out_8(&PSC(port)->command,MPC52xx_PSC_RST_ERR_STAT);
445
446 }
Alan Cox33f0f882006-01-09 20:54:13 -0800447 tty_insert_flip_char(tty, ch, flag);
448 if (status & MPC52xx_PSC_SR_OE) {
449 /*
450 * Overrun is special, since it's
451 * reported immediately, and doesn't
452 * affect the current character
453 */
454 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
455 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 }
457
458 tty_flip_buffer_push(tty);
459
460 return in_be16(&PSC(port)->mpc52xx_psc_status) & MPC52xx_PSC_SR_RXRDY;
461}
462
463static inline int
464mpc52xx_uart_int_tx_chars(struct uart_port *port)
465{
466 struct circ_buf *xmit = &port->info->xmit;
467
468 /* Process out of band chars */
469 if (port->x_char) {
470 out_8(&PSC(port)->mpc52xx_psc_buffer_8, port->x_char);
471 port->icount.tx++;
472 port->x_char = 0;
473 return 1;
474 }
475
476 /* Nothing to do ? */
477 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
Russell Kingb129a8c2005-08-31 10:12:14 +0100478 mpc52xx_uart_stop_tx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 return 0;
480 }
481
482 /* Send chars */
483 while (in_be16(&PSC(port)->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXRDY) {
484 out_8(&PSC(port)->mpc52xx_psc_buffer_8, xmit->buf[xmit->tail]);
485 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
486 port->icount.tx++;
487 if (uart_circ_empty(xmit))
488 break;
489 }
490
491 /* Wake up */
492 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
493 uart_write_wakeup(port);
494
495 /* Maybe we're done after all */
496 if (uart_circ_empty(xmit)) {
Russell Kingb129a8c2005-08-31 10:12:14 +0100497 mpc52xx_uart_stop_tx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 return 0;
499 }
500
501 return 1;
502}
503
504static irqreturn_t
505mpc52xx_uart_int(int irq, void *dev_id, struct pt_regs *regs)
506{
507 struct uart_port *port = (struct uart_port *) dev_id;
508 unsigned long pass = ISR_PASS_LIMIT;
509 unsigned int keepgoing;
510 unsigned short status;
511
512 if ( irq != port->irq ) {
513 printk( KERN_WARNING
514 "mpc52xx_uart_int : " \
515 "Received wrong int %d. Waiting for %d\n",
516 irq, port->irq);
517 return IRQ_NONE;
518 }
519
520 spin_lock(&port->lock);
521
522 /* While we have stuff to do, we continue */
523 do {
524 /* If we don't find anything to do, we stop */
525 keepgoing = 0;
526
527 /* Read status */
528 status = in_be16(&PSC(port)->mpc52xx_psc_isr);
529 status &= port->read_status_mask;
530
531 /* Do we need to receive chars ? */
532 /* For this RX interrupts must be on and some chars waiting */
533 if ( status & MPC52xx_PSC_IMR_RXRDY )
534 keepgoing |= mpc52xx_uart_int_rx_chars(port, regs);
535
536 /* Do we need to send chars ? */
537 /* For this, TX must be ready and TX interrupt enabled */
538 if ( status & MPC52xx_PSC_IMR_TXRDY )
539 keepgoing |= mpc52xx_uart_int_tx_chars(port);
540
541 /* Limit number of iteration */
542 if ( !(--pass) )
543 keepgoing = 0;
544
545 } while (keepgoing);
546
547 spin_unlock(&port->lock);
548
549 return IRQ_HANDLED;
550}
551
552
553/* ======================================================================== */
554/* Console ( if applicable ) */
555/* ======================================================================== */
556
557#ifdef CONFIG_SERIAL_MPC52xx_CONSOLE
558
559static void __init
560mpc52xx_console_get_options(struct uart_port *port,
561 int *baud, int *parity, int *bits, int *flow)
562{
563 struct mpc52xx_psc __iomem *psc = PSC(port);
564 unsigned char mr1;
565
566 /* Read the mode registers */
567 out_8(&psc->command,MPC52xx_PSC_SEL_MODE_REG_1);
568 mr1 = in_8(&psc->mode);
569
570 /* CT{U,L}R are write-only ! */
571 *baud = __res.bi_baudrate ?
572 __res.bi_baudrate : CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
573
574 /* Parse them */
575 switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
576 case MPC52xx_PSC_MODE_5_BITS: *bits = 5; break;
577 case MPC52xx_PSC_MODE_6_BITS: *bits = 6; break;
578 case MPC52xx_PSC_MODE_7_BITS: *bits = 7; break;
579 case MPC52xx_PSC_MODE_8_BITS:
580 default: *bits = 8;
581 }
582
583 if (mr1 & MPC52xx_PSC_MODE_PARNONE)
584 *parity = 'n';
585 else
586 *parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
587}
588
589static void
590mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
591{
592 struct uart_port *port = &mpc52xx_uart_ports[co->index];
593 struct mpc52xx_psc __iomem *psc = PSC(port);
594 unsigned int i, j;
595
596 /* Disable interrupts */
597 out_be16(&psc->mpc52xx_psc_imr, 0);
598
599 /* Wait the TX buffer to be empty */
600 j = 5000000; /* Maximum wait */
601 while (!(in_be16(&psc->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXEMP) &&
602 --j)
603 udelay(1);
604
605 /* Write all the chars */
606 for ( i=0 ; i<count ; i++ ) {
607
608 /* Send the char */
609 out_8(&psc->mpc52xx_psc_buffer_8, *s);
610
611 /* Line return handling */
612 if ( *s++ == '\n' )
613 out_8(&psc->mpc52xx_psc_buffer_8, '\r');
614
615 /* Wait the TX buffer to be empty */
616 j = 20000; /* Maximum wait */
617 while (!(in_be16(&psc->mpc52xx_psc_status) &
618 MPC52xx_PSC_SR_TXEMP) && --j)
619 udelay(1);
620 }
621
622 /* Restore interrupt state */
623 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
624}
625
626static int __init
627mpc52xx_console_setup(struct console *co, char *options)
628{
629 struct uart_port *port = &mpc52xx_uart_ports[co->index];
630
631 int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
632 int bits = 8;
633 int parity = 'n';
634 int flow = 'n';
635
636 if (co->index < 0 || co->index >= MPC52xx_PSC_MAXNUM)
637 return -EINVAL;
638
639 /* Basic port init. Needed since we use some uart_??? func before
640 * real init for early access */
641 spin_lock_init(&port->lock);
642 port->uartclk = __res.bi_ipbfreq / 2; /* Look at CTLR doc */
643 port->ops = &mpc52xx_uart_ops;
644 port->mapbase = MPC52xx_PA(MPC52xx_PSCx_OFFSET(co->index+1));
645
646 /* We ioremap ourself */
647 port->membase = ioremap(port->mapbase, MPC52xx_PSC_SIZE);
648 if (port->membase == NULL)
649 return -EINVAL;
650
651 /* Setup the port parameters accoding to options */
652 if (options)
653 uart_parse_options(options, &baud, &parity, &bits, &flow);
654 else
655 mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
656
657 return uart_set_options(port, co, baud, parity, bits, flow);
658}
659
660
Sylvain Munaut2d8179c2006-01-06 00:11:31 -0800661static struct uart_driver mpc52xx_uart_driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
663static struct console mpc52xx_console = {
Sylvain Munautd62de3a2006-01-06 00:11:32 -0800664 .name = "ttyPSC",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 .write = mpc52xx_console_write,
666 .device = uart_console_device,
667 .setup = mpc52xx_console_setup,
668 .flags = CON_PRINTBUFFER,
Sylvain Munautd62de3a2006-01-06 00:11:32 -0800669 .index = -1, /* Specified on the cmdline (e.g. console=ttyPSC0 ) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 .data = &mpc52xx_uart_driver,
671};
672
673
674static int __init
675mpc52xx_console_init(void)
676{
677 register_console(&mpc52xx_console);
678 return 0;
679}
680
681console_initcall(mpc52xx_console_init);
682
683#define MPC52xx_PSC_CONSOLE &mpc52xx_console
684#else
685#define MPC52xx_PSC_CONSOLE NULL
686#endif
687
688
689/* ======================================================================== */
690/* UART Driver */
691/* ======================================================================== */
692
693static struct uart_driver mpc52xx_uart_driver = {
694 .owner = THIS_MODULE,
695 .driver_name = "mpc52xx_psc_uart",
Sylvain Munautd62de3a2006-01-06 00:11:32 -0800696 .dev_name = "ttyPSC",
697 .devfs_name = "ttyPSC",
698 .major = SERIAL_PSC_MAJOR,
699 .minor = SERIAL_PSC_MINOR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 .nr = MPC52xx_PSC_MAXNUM,
701 .cons = MPC52xx_PSC_CONSOLE,
702};
703
704
705/* ======================================================================== */
706/* Platform Driver */
707/* ======================================================================== */
708
709static int __devinit
Russell King3ae5eae2005-11-09 22:32:44 +0000710mpc52xx_uart_probe(struct platform_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711{
Russell King3ae5eae2005-11-09 22:32:44 +0000712 struct resource *res = dev->resource;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713
714 struct uart_port *port = NULL;
715 int i, idx, ret;
716
717 /* Check validity & presence */
Andrey Volkov38801e22005-11-12 22:04:06 +0000718 idx = dev->id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 if (idx < 0 || idx >= MPC52xx_PSC_MAXNUM)
720 return -EINVAL;
721
722 if (!mpc52xx_match_psc_function(idx,"uart"))
723 return -ENODEV;
724
725 /* Init the port structure */
726 port = &mpc52xx_uart_ports[idx];
727
728 memset(port, 0x00, sizeof(struct uart_port));
729
730 spin_lock_init(&port->lock);
731 port->uartclk = __res.bi_ipbfreq / 2; /* Look at CTLR doc */
732 port->fifosize = 255; /* Should be 512 ! But it can't be */
733 /* stored in a unsigned char */
734 port->iotype = UPIO_MEM;
735 port->flags = UPF_BOOT_AUTOCONF |
736 ( uart_console(port) ? 0 : UPF_IOREMAP );
737 port->line = idx;
738 port->ops = &mpc52xx_uart_ops;
739
740 /* Search for IRQ and mapbase */
Andrey Volkov38801e22005-11-12 22:04:06 +0000741 for (i=0 ; i<dev->num_resources ; i++, res++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 if (res->flags & IORESOURCE_MEM)
743 port->mapbase = res->start;
744 else if (res->flags & IORESOURCE_IRQ)
745 port->irq = res->start;
746 }
747 if (!port->irq || !port->mapbase)
748 return -EINVAL;
749
750 /* Add the port to the uart sub-system */
751 ret = uart_add_one_port(&mpc52xx_uart_driver, port);
752 if (!ret)
Russell King3ae5eae2005-11-09 22:32:44 +0000753 platform_set_drvdata(dev, (void*)port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754
755 return ret;
756}
757
758static int
Russell King3ae5eae2005-11-09 22:32:44 +0000759mpc52xx_uart_remove(struct platform_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760{
Russell King3ae5eae2005-11-09 22:32:44 +0000761 struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762
Russell King3ae5eae2005-11-09 22:32:44 +0000763 platform_set_drvdata(dev, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764
765 if (port)
766 uart_remove_one_port(&mpc52xx_uart_driver, port);
767
768 return 0;
769}
770
771#ifdef CONFIG_PM
772static int
Russell King3ae5eae2005-11-09 22:32:44 +0000773mpc52xx_uart_suspend(struct platform_device *dev, pm_message_t state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774{
Russell King3ae5eae2005-11-09 22:32:44 +0000775 struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776
Russell King9480e302005-10-28 09:52:56 -0700777 if (sport)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 uart_suspend_port(&mpc52xx_uart_driver, port);
779
780 return 0;
781}
782
783static int
Russell King3ae5eae2005-11-09 22:32:44 +0000784mpc52xx_uart_resume(struct platform_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785{
Russell King3ae5eae2005-11-09 22:32:44 +0000786 struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
Russell King9480e302005-10-28 09:52:56 -0700788 if (port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 uart_resume_port(&mpc52xx_uart_driver, port);
790
791 return 0;
792}
793#endif
794
Russell King3ae5eae2005-11-09 22:32:44 +0000795static struct platform_driver mpc52xx_uart_platform_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 .probe = mpc52xx_uart_probe,
797 .remove = mpc52xx_uart_remove,
798#ifdef CONFIG_PM
799 .suspend = mpc52xx_uart_suspend,
800 .resume = mpc52xx_uart_resume,
801#endif
Russell King3ae5eae2005-11-09 22:32:44 +0000802 .driver = {
803 .name = "mpc52xx-psc",
804 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805};
806
807
808/* ======================================================================== */
809/* Module */
810/* ======================================================================== */
811
812static int __init
813mpc52xx_uart_init(void)
814{
815 int ret;
816
817 printk(KERN_INFO "Serial: MPC52xx PSC driver\n");
818
819 ret = uart_register_driver(&mpc52xx_uart_driver);
820 if (ret == 0) {
Russell King3ae5eae2005-11-09 22:32:44 +0000821 ret = platform_driver_register(&mpc52xx_uart_platform_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 if (ret)
823 uart_unregister_driver(&mpc52xx_uart_driver);
824 }
825
826 return ret;
827}
828
829static void __exit
830mpc52xx_uart_exit(void)
831{
Russell King3ae5eae2005-11-09 22:32:44 +0000832 platform_driver_unregister(&mpc52xx_uart_platform_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 uart_unregister_driver(&mpc52xx_uart_driver);
834}
835
836
837module_init(mpc52xx_uart_init);
838module_exit(mpc52xx_uart_exit);
839
840MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
841MODULE_DESCRIPTION("Freescale MPC52xx PSC UART");
842MODULE_LICENSE("GPL");