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1/*
2 * m32r_sio.c
3 *
4 * Driver for M32R serial ports
5 *
6 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
7 * Based on drivers/serial/8250.c.
8 *
9 * Copyright (C) 2001 Russell King.
10 * Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 */
17
18/*
19 * A note about mapbase / membase
20 *
21 * mapbase is the physical address of the IO port. Currently, we don't
22 * support this very well, and it may well be dropped from this driver
23 * in future. As such, mapbase should be NULL.
24 *
25 * membase is an 'ioremapped' cookie. This is compatible with the old
26 * serial.c driver, and is currently the preferred form.
27 */
28
29#if defined(CONFIG_SERIAL_M32R_SIO_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
30#define SUPPORT_SYSRQ
31#endif
32
33#include <linux/tty.h>
34#include <linux/tty_flip.h>
35#include <linux/ioport.h>
36#include <linux/init.h>
37#include <linux/console.h>
38#include <linux/sysrq.h>
39#include <linux/serial.h>
40#include <linux/delay.h>
41
42#include <asm/m32r.h>
43#include <asm/io.h>
44#include <asm/irq.h>
45
46#define BAUD_RATE 115200
47
48#include <linux/serial_core.h>
49#include "m32r_sio_reg.h"
50
51#define PASS_LIMIT 256
52
53static const struct {
54 unsigned int port;
55 unsigned int irq;
56} old_serial_port[] = {
57#if defined(CONFIG_PLAT_USRV)
58 /* PORT IRQ FLAGS */
59 { 0x3F8, PLD_IRQ_UART0 }, /* ttyS0 */
60 { 0x2F8, PLD_IRQ_UART1 }, /* ttyS1 */
61#elif defined(CONFIG_SERIAL_M32R_PLDSIO)
62 { ((unsigned long)PLD_ESIO0CR), PLD_IRQ_SIO0_RCV }, /* ttyS0 */
63#else
64 { M32R_SIO_OFFSET, M32R_IRQ_SIO0_R }, /* ttyS0 */
65#endif
66};
67
68#define UART_NR ARRAY_SIZE(old_serial_port)
69
70struct uart_sio_port {
71 struct uart_port port;
72 struct timer_list timer; /* "no irq" timer */
73 struct list_head list; /* ports on this IRQ */
74 unsigned char ier;
75};
76
77struct irq_info {
78 spinlock_t lock;
79 struct list_head *head;
80};
81
82static struct irq_info irq_lists[NR_IRQS];
83
84#ifdef CONFIG_SERIAL_M32R_PLDSIO
85
86#define __sio_in(x) inw((unsigned long)(x))
87#define __sio_out(v,x) outw((v),(unsigned long)(x))
88
89static inline void sio_set_baud_rate(unsigned long baud)
90{
91 unsigned short sbaud;
92 sbaud = (boot_cpu_data.bus_clock / (baud * 4))-1;
93 __sio_out(sbaud, PLD_ESIO0BAUR);
94}
95
96static void sio_reset(void)
97{
98 unsigned short tmp;
99
100 tmp = __sio_in(PLD_ESIO0RXB);
101 tmp = __sio_in(PLD_ESIO0RXB);
102 tmp = __sio_in(PLD_ESIO0CR);
103 sio_set_baud_rate(BAUD_RATE);
104 __sio_out(0x0300, PLD_ESIO0CR);
105 __sio_out(0x0003, PLD_ESIO0CR);
106}
107
108static void sio_init(void)
109{
110 unsigned short tmp;
111
112 tmp = __sio_in(PLD_ESIO0RXB);
113 tmp = __sio_in(PLD_ESIO0RXB);
114 tmp = __sio_in(PLD_ESIO0CR);
115 __sio_out(0x0300, PLD_ESIO0CR);
116 __sio_out(0x0003, PLD_ESIO0CR);
117}
118
119static void sio_error(int *status)
120{
121 printk("SIO0 error[%04x]\n", *status);
122 do {
123 sio_init();
124 } while ((*status = __sio_in(PLD_ESIO0CR)) != 3);
125}
126
127#else /* not CONFIG_SERIAL_M32R_PLDSIO */
128
129#define __sio_in(x) inl(x)
130#define __sio_out(v,x) outl((v),(x))
131
132static inline void sio_set_baud_rate(unsigned long baud)
133{
134 unsigned long i, j;
135
136 i = boot_cpu_data.bus_clock / (baud * 16);
137 j = (boot_cpu_data.bus_clock - (i * baud * 16)) / baud;
138 i -= 1;
139 j = (j + 1) >> 1;
140
141 __sio_out(i, M32R_SIO0_BAUR_PORTL);
142 __sio_out(j, M32R_SIO0_RBAUR_PORTL);
143}
144
145static void sio_reset(void)
146{
147 __sio_out(0x00000300, M32R_SIO0_CR_PORTL); /* init status */
148 __sio_out(0x00000800, M32R_SIO0_MOD1_PORTL); /* 8bit */
149 __sio_out(0x00000080, M32R_SIO0_MOD0_PORTL); /* 1stop non */
150 sio_set_baud_rate(BAUD_RATE);
151 __sio_out(0x00000000, M32R_SIO0_TRCR_PORTL);
152 __sio_out(0x00000003, M32R_SIO0_CR_PORTL); /* RXCEN */
153}
154
155static void sio_init(void)
156{
157 unsigned int tmp;
158
159 tmp = __sio_in(M32R_SIO0_RXB_PORTL);
160 tmp = __sio_in(M32R_SIO0_RXB_PORTL);
161 tmp = __sio_in(M32R_SIO0_STS_PORTL);
162 __sio_out(0x00000003, M32R_SIO0_CR_PORTL);
163}
164
165static void sio_error(int *status)
166{
167 printk("SIO0 error[%04x]\n", *status);
168 do {
169 sio_init();
170 } while ((*status = __sio_in(M32R_SIO0_CR_PORTL)) != 3);
171}
172
173#endif /* CONFIG_SERIAL_M32R_PLDSIO */
174
175static unsigned int sio_in(struct uart_sio_port *up, int offset)
176{
177 return __sio_in(up->port.iobase + offset);
178}
179
180static void sio_out(struct uart_sio_port *up, int offset, int value)
181{
182 __sio_out(value, up->port.iobase + offset);
183}
184
185static unsigned int serial_in(struct uart_sio_port *up, int offset)
186{
187 if (!offset)
188 return 0;
189
190 return __sio_in(offset);
191}
192
193static void serial_out(struct uart_sio_port *up, int offset, int value)
194{
195 if (!offset)
196 return;
197
198 __sio_out(value, offset);
199}
200
201static void m32r_sio_stop_tx(struct uart_port *port)
202{
203 struct uart_sio_port *up =
204 container_of(port, struct uart_sio_port, port);
205
206 if (up->ier & UART_IER_THRI) {
207 up->ier &= ~UART_IER_THRI;
208 serial_out(up, UART_IER, up->ier);
209 }
210}
211
212static void m32r_sio_start_tx(struct uart_port *port)
213{
214#ifdef CONFIG_SERIAL_M32R_PLDSIO
215 struct uart_sio_port *up =
216 container_of(port, struct uart_sio_port, port);
217 struct circ_buf *xmit = &up->port.state->xmit;
218
219 if (!(up->ier & UART_IER_THRI)) {
220 up->ier |= UART_IER_THRI;
221 serial_out(up, UART_IER, up->ier);
222 if (!uart_circ_empty(xmit)) {
223 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
224 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
225 up->port.icount.tx++;
226 }
227 }
228 while((serial_in(up, UART_LSR) & UART_EMPTY) != UART_EMPTY);
229#else
230 struct uart_sio_port *up =
231 container_of(port, struct uart_sio_port, port);
232
233 if (!(up->ier & UART_IER_THRI)) {
234 up->ier |= UART_IER_THRI;
235 serial_out(up, UART_IER, up->ier);
236 }
237#endif
238}
239
240static void m32r_sio_stop_rx(struct uart_port *port)
241{
242 struct uart_sio_port *up =
243 container_of(port, struct uart_sio_port, port);
244
245 up->ier &= ~UART_IER_RLSI;
246 up->port.read_status_mask &= ~UART_LSR_DR;
247 serial_out(up, UART_IER, up->ier);
248}
249
250static void m32r_sio_enable_ms(struct uart_port *port)
251{
252 struct uart_sio_port *up =
253 container_of(port, struct uart_sio_port, port);
254
255 up->ier |= UART_IER_MSI;
256 serial_out(up, UART_IER, up->ier);
257}
258
259static void receive_chars(struct uart_sio_port *up, int *status)
260{
261 struct tty_port *port = &up->port.state->port;
262 unsigned char ch;
263 unsigned char flag;
264 int max_count = 256;
265
266 do {
267 ch = sio_in(up, SIORXB);
268 flag = TTY_NORMAL;
269 up->port.icount.rx++;
270
271 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
272 UART_LSR_FE | UART_LSR_OE))) {
273 /*
274 * For statistics only
275 */
276 if (*status & UART_LSR_BI) {
277 *status &= ~(UART_LSR_FE | UART_LSR_PE);
278 up->port.icount.brk++;
279 /*
280 * We do the SysRQ and SAK checking
281 * here because otherwise the break
282 * may get masked by ignore_status_mask
283 * or read_status_mask.
284 */
285 if (uart_handle_break(&up->port))
286 goto ignore_char;
287 } else if (*status & UART_LSR_PE)
288 up->port.icount.parity++;
289 else if (*status & UART_LSR_FE)
290 up->port.icount.frame++;
291 if (*status & UART_LSR_OE)
292 up->port.icount.overrun++;
293
294 /*
295 * Mask off conditions which should be ingored.
296 */
297 *status &= up->port.read_status_mask;
298
299 if (*status & UART_LSR_BI) {
300 pr_debug("handling break....\n");
301 flag = TTY_BREAK;
302 } else if (*status & UART_LSR_PE)
303 flag = TTY_PARITY;
304 else if (*status & UART_LSR_FE)
305 flag = TTY_FRAME;
306 }
307 if (uart_handle_sysrq_char(&up->port, ch))
308 goto ignore_char;
309 if ((*status & up->port.ignore_status_mask) == 0)
310 tty_insert_flip_char(port, ch, flag);
311
312 if (*status & UART_LSR_OE) {
313 /*
314 * Overrun is special, since it's reported
315 * immediately, and doesn't affect the current
316 * character.
317 */
318 tty_insert_flip_char(port, 0, TTY_OVERRUN);
319 }
320 ignore_char:
321 *status = serial_in(up, UART_LSR);
322 } while ((*status & UART_LSR_DR) && (max_count-- > 0));
323
324 spin_unlock(&up->port.lock);
325 tty_flip_buffer_push(port);
326 spin_lock(&up->port.lock);
327}
328
329static void transmit_chars(struct uart_sio_port *up)
330{
331 struct circ_buf *xmit = &up->port.state->xmit;
332 int count;
333
334 if (up->port.x_char) {
335#ifndef CONFIG_SERIAL_M32R_PLDSIO /* XXX */
336 serial_out(up, UART_TX, up->port.x_char);
337#endif
338 up->port.icount.tx++;
339 up->port.x_char = 0;
340 return;
341 }
342 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
343 m32r_sio_stop_tx(&up->port);
344 return;
345 }
346
347 count = up->port.fifosize;
348 do {
349 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
350 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
351 up->port.icount.tx++;
352 if (uart_circ_empty(xmit))
353 break;
354 while (!(serial_in(up, UART_LSR) & UART_LSR_THRE));
355
356 } while (--count > 0);
357
358 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
359 uart_write_wakeup(&up->port);
360
361 pr_debug("THRE...\n");
362
363 if (uart_circ_empty(xmit))
364 m32r_sio_stop_tx(&up->port);
365}
366
367/*
368 * This handles the interrupt from one port.
369 */
370static inline void m32r_sio_handle_port(struct uart_sio_port *up,
371 unsigned int status)
372{
373 pr_debug("status = %x...\n", status);
374
375 if (status & 0x04)
376 receive_chars(up, &status);
377 if (status & 0x01)
378 transmit_chars(up);
379}
380
381/*
382 * This is the serial driver's interrupt routine.
383 *
384 * Arjan thinks the old way was overly complex, so it got simplified.
385 * Alan disagrees, saying that need the complexity to handle the weird
386 * nature of ISA shared interrupts. (This is a special exception.)
387 *
388 * In order to handle ISA shared interrupts properly, we need to check
389 * that all ports have been serviced, and therefore the ISA interrupt
390 * line has been de-asserted.
391 *
392 * This means we need to loop through all ports. checking that they
393 * don't have an interrupt pending.
394 */
395static irqreturn_t m32r_sio_interrupt(int irq, void *dev_id)
396{
397 struct irq_info *i = dev_id;
398 struct list_head *l, *end = NULL;
399 int pass_counter = 0;
400
401 pr_debug("m32r_sio_interrupt(%d)...\n", irq);
402
403#ifdef CONFIG_SERIAL_M32R_PLDSIO
404// if (irq == PLD_IRQ_SIO0_SND)
405// irq = PLD_IRQ_SIO0_RCV;
406#else
407 if (irq == M32R_IRQ_SIO0_S)
408 irq = M32R_IRQ_SIO0_R;
409#endif
410
411 spin_lock(&i->lock);
412
413 l = i->head;
414 do {
415 struct uart_sio_port *up;
416 unsigned int sts;
417
418 up = list_entry(l, struct uart_sio_port, list);
419
420 sts = sio_in(up, SIOSTS);
421 if (sts & 0x5) {
422 spin_lock(&up->port.lock);
423 m32r_sio_handle_port(up, sts);
424 spin_unlock(&up->port.lock);
425
426 end = NULL;
427 } else if (end == NULL)
428 end = l;
429
430 l = l->next;
431
432 if (l == i->head && pass_counter++ > PASS_LIMIT) {
433 if (sts & 0xe0)
434 sio_error(&sts);
435 break;
436 }
437 } while (l != end);
438
439 spin_unlock(&i->lock);
440
441 pr_debug("end.\n");
442
443 return IRQ_HANDLED;
444}
445
446/*
447 * To support ISA shared interrupts, we need to have one interrupt
448 * handler that ensures that the IRQ line has been deasserted
449 * before returning. Failing to do this will result in the IRQ
450 * line being stuck active, and, since ISA irqs are edge triggered,
451 * no more IRQs will be seen.
452 */
453static void serial_do_unlink(struct irq_info *i, struct uart_sio_port *up)
454{
455 spin_lock_irq(&i->lock);
456
457 if (!list_empty(i->head)) {
458 if (i->head == &up->list)
459 i->head = i->head->next;
460 list_del(&up->list);
461 } else {
462 BUG_ON(i->head != &up->list);
463 i->head = NULL;
464 }
465
466 spin_unlock_irq(&i->lock);
467}
468
469static int serial_link_irq_chain(struct uart_sio_port *up)
470{
471 struct irq_info *i = irq_lists + up->port.irq;
472 int ret, irq_flags = 0;
473
474 spin_lock_irq(&i->lock);
475
476 if (i->head) {
477 list_add(&up->list, i->head);
478 spin_unlock_irq(&i->lock);
479
480 ret = 0;
481 } else {
482 INIT_LIST_HEAD(&up->list);
483 i->head = &up->list;
484 spin_unlock_irq(&i->lock);
485
486 ret = request_irq(up->port.irq, m32r_sio_interrupt,
487 irq_flags, "SIO0-RX", i);
488 ret |= request_irq(up->port.irq + 1, m32r_sio_interrupt,
489 irq_flags, "SIO0-TX", i);
490 if (ret < 0)
491 serial_do_unlink(i, up);
492 }
493
494 return ret;
495}
496
497static void serial_unlink_irq_chain(struct uart_sio_port *up)
498{
499 struct irq_info *i = irq_lists + up->port.irq;
500
501 BUG_ON(i->head == NULL);
502
503 if (list_empty(i->head)) {
504 free_irq(up->port.irq, i);
505 free_irq(up->port.irq + 1, i);
506 }
507
508 serial_do_unlink(i, up);
509}
510
511/*
512 * This function is used to handle ports that do not have an interrupt.
513 */
514static void m32r_sio_timeout(unsigned long data)
515{
516 struct uart_sio_port *up = (struct uart_sio_port *)data;
517 unsigned int timeout;
518 unsigned int sts;
519
520 sts = sio_in(up, SIOSTS);
521 if (sts & 0x5) {
522 spin_lock(&up->port.lock);
523 m32r_sio_handle_port(up, sts);
524 spin_unlock(&up->port.lock);
525 }
526
527 timeout = up->port.timeout;
528 timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
529 mod_timer(&up->timer, jiffies + timeout);
530}
531
532static unsigned int m32r_sio_tx_empty(struct uart_port *port)
533{
534 struct uart_sio_port *up =
535 container_of(port, struct uart_sio_port, port);
536 unsigned long flags;
537 unsigned int ret;
538
539 spin_lock_irqsave(&up->port.lock, flags);
540 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
541 spin_unlock_irqrestore(&up->port.lock, flags);
542
543 return ret;
544}
545
546static unsigned int m32r_sio_get_mctrl(struct uart_port *port)
547{
548 return 0;
549}
550
551static void m32r_sio_set_mctrl(struct uart_port *port, unsigned int mctrl)
552{
553
554}
555
556static void m32r_sio_break_ctl(struct uart_port *port, int break_state)
557{
558
559}
560
561static int m32r_sio_startup(struct uart_port *port)
562{
563 struct uart_sio_port *up =
564 container_of(port, struct uart_sio_port, port);
565 int retval;
566
567 sio_init();
568
569 /*
570 * If the "interrupt" for this port doesn't correspond with any
571 * hardware interrupt, we use a timer-based system. The original
572 * driver used to do this with IRQ0.
573 */
574 if (!up->port.irq) {
575 unsigned int timeout = up->port.timeout;
576
577 timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
578
579 up->timer.data = (unsigned long)up;
580 mod_timer(&up->timer, jiffies + timeout);
581 } else {
582 retval = serial_link_irq_chain(up);
583 if (retval)
584 return retval;
585 }
586
587 /*
588 * Finally, enable interrupts. Note: Modem status interrupts
589 * are set via set_termios(), which will be occurring imminently
590 * anyway, so we don't enable them here.
591 * - M32R_SIO: 0x0c
592 * - M32R_PLDSIO: 0x04
593 */
594 up->ier = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
595 sio_out(up, SIOTRCR, up->ier);
596
597 /*
598 * And clear the interrupt registers again for luck.
599 */
600 sio_reset();
601
602 return 0;
603}
604
605static void m32r_sio_shutdown(struct uart_port *port)
606{
607 struct uart_sio_port *up =
608 container_of(port, struct uart_sio_port, port);
609
610 /*
611 * Disable interrupts from this port
612 */
613 up->ier = 0;
614 sio_out(up, SIOTRCR, 0);
615
616 /*
617 * Disable break condition and FIFOs
618 */
619
620 sio_init();
621
622 if (!up->port.irq)
623 del_timer_sync(&up->timer);
624 else
625 serial_unlink_irq_chain(up);
626}
627
628static unsigned int m32r_sio_get_divisor(struct uart_port *port,
629 unsigned int baud)
630{
631 return uart_get_divisor(port, baud);
632}
633
634static void m32r_sio_set_termios(struct uart_port *port,
635 struct ktermios *termios, struct ktermios *old)
636{
637 struct uart_sio_port *up =
638 container_of(port, struct uart_sio_port, port);
639 unsigned char cval = 0;
640 unsigned long flags;
641 unsigned int baud, quot;
642
643 switch (termios->c_cflag & CSIZE) {
644 case CS5:
645 cval = UART_LCR_WLEN5;
646 break;
647 case CS6:
648 cval = UART_LCR_WLEN6;
649 break;
650 case CS7:
651 cval = UART_LCR_WLEN7;
652 break;
653 default:
654 case CS8:
655 cval = UART_LCR_WLEN8;
656 break;
657 }
658
659 if (termios->c_cflag & CSTOPB)
660 cval |= UART_LCR_STOP;
661 if (termios->c_cflag & PARENB)
662 cval |= UART_LCR_PARITY;
663 if (!(termios->c_cflag & PARODD))
664 cval |= UART_LCR_EPAR;
665#ifdef CMSPAR
666 if (termios->c_cflag & CMSPAR)
667 cval |= UART_LCR_SPAR;
668#endif
669
670 /*
671 * Ask the core to calculate the divisor for us.
672 */
673#ifdef CONFIG_SERIAL_M32R_PLDSIO
674 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/4);
675#else
676 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
677#endif
678 quot = m32r_sio_get_divisor(port, baud);
679
680 /*
681 * Ok, we're now changing the port state. Do it with
682 * interrupts disabled.
683 */
684 spin_lock_irqsave(&up->port.lock, flags);
685
686 sio_set_baud_rate(baud);
687
688 /*
689 * Update the per-port timeout.
690 */
691 uart_update_timeout(port, termios->c_cflag, baud);
692
693 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
694 if (termios->c_iflag & INPCK)
695 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
696 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
697 up->port.read_status_mask |= UART_LSR_BI;
698
699 /*
700 * Characteres to ignore
701 */
702 up->port.ignore_status_mask = 0;
703 if (termios->c_iflag & IGNPAR)
704 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
705 if (termios->c_iflag & IGNBRK) {
706 up->port.ignore_status_mask |= UART_LSR_BI;
707 /*
708 * If we're ignoring parity and break indicators,
709 * ignore overruns too (for real raw support).
710 */
711 if (termios->c_iflag & IGNPAR)
712 up->port.ignore_status_mask |= UART_LSR_OE;
713 }
714
715 /*
716 * ignore all characters if CREAD is not set
717 */
718 if ((termios->c_cflag & CREAD) == 0)
719 up->port.ignore_status_mask |= UART_LSR_DR;
720
721 /*
722 * CTS flow control flag and modem status interrupts
723 */
724 up->ier &= ~UART_IER_MSI;
725 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
726 up->ier |= UART_IER_MSI;
727
728 serial_out(up, UART_IER, up->ier);
729
730 spin_unlock_irqrestore(&up->port.lock, flags);
731}
732
733/*
734 * Resource handling. This is complicated by the fact that resources
735 * depend on the port type. Maybe we should be claiming the standard
736 * 8250 ports, and then trying to get other resources as necessary?
737 */
738static int
739m32r_sio_request_std_resource(struct uart_sio_port *up, struct resource **res)
740{
741 unsigned int size = 8 << up->port.regshift;
742#ifndef CONFIG_SERIAL_M32R_PLDSIO
743 unsigned long start;
744#endif
745 int ret = 0;
746
747 switch (up->port.iotype) {
748 case UPIO_MEM:
749 if (up->port.mapbase) {
750#ifdef CONFIG_SERIAL_M32R_PLDSIO
751 *res = request_mem_region(up->port.mapbase, size, "serial");
752#else
753 start = up->port.mapbase;
754 *res = request_mem_region(start, size, "serial");
755#endif
756 if (!*res)
757 ret = -EBUSY;
758 }
759 break;
760
761 case UPIO_PORT:
762 *res = request_region(up->port.iobase, size, "serial");
763 if (!*res)
764 ret = -EBUSY;
765 break;
766 }
767 return ret;
768}
769
770static void m32r_sio_release_port(struct uart_port *port)
771{
772 struct uart_sio_port *up =
773 container_of(port, struct uart_sio_port, port);
774 unsigned long start, offset = 0, size = 0;
775
776 size <<= up->port.regshift;
777
778 switch (up->port.iotype) {
779 case UPIO_MEM:
780 if (up->port.mapbase) {
781 /*
782 * Unmap the area.
783 */
784 iounmap(up->port.membase);
785 up->port.membase = NULL;
786
787 start = up->port.mapbase;
788
789 if (size)
790 release_mem_region(start + offset, size);
791 release_mem_region(start, 8 << up->port.regshift);
792 }
793 break;
794
795 case UPIO_PORT:
796 start = up->port.iobase;
797
798 if (size)
799 release_region(start + offset, size);
800 release_region(start + offset, 8 << up->port.regshift);
801 break;
802
803 default:
804 break;
805 }
806}
807
808static int m32r_sio_request_port(struct uart_port *port)
809{
810 struct uart_sio_port *up =
811 container_of(port, struct uart_sio_port, port);
812 struct resource *res = NULL;
813 int ret = 0;
814
815 ret = m32r_sio_request_std_resource(up, &res);
816
817 /*
818 * If we have a mapbase, then request that as well.
819 */
820 if (ret == 0 && up->port.flags & UPF_IOREMAP) {
821 int size = resource_size(res);
822
823 up->port.membase = ioremap(up->port.mapbase, size);
824 if (!up->port.membase)
825 ret = -ENOMEM;
826 }
827
828 if (ret < 0) {
829 if (res)
830 release_resource(res);
831 }
832
833 return ret;
834}
835
836static void m32r_sio_config_port(struct uart_port *port, int unused)
837{
838 struct uart_sio_port *up =
839 container_of(port, struct uart_sio_port, port);
840 unsigned long flags;
841
842 spin_lock_irqsave(&up->port.lock, flags);
843
844 up->port.fifosize = 1;
845
846 spin_unlock_irqrestore(&up->port.lock, flags);
847}
848
849static int
850m32r_sio_verify_port(struct uart_port *port, struct serial_struct *ser)
851{
852 if (ser->irq >= nr_irqs || ser->irq < 0 || ser->baud_base < 9600)
853 return -EINVAL;
854 return 0;
855}
856
857static struct uart_ops m32r_sio_pops = {
858 .tx_empty = m32r_sio_tx_empty,
859 .set_mctrl = m32r_sio_set_mctrl,
860 .get_mctrl = m32r_sio_get_mctrl,
861 .stop_tx = m32r_sio_stop_tx,
862 .start_tx = m32r_sio_start_tx,
863 .stop_rx = m32r_sio_stop_rx,
864 .enable_ms = m32r_sio_enable_ms,
865 .break_ctl = m32r_sio_break_ctl,
866 .startup = m32r_sio_startup,
867 .shutdown = m32r_sio_shutdown,
868 .set_termios = m32r_sio_set_termios,
869 .release_port = m32r_sio_release_port,
870 .request_port = m32r_sio_request_port,
871 .config_port = m32r_sio_config_port,
872 .verify_port = m32r_sio_verify_port,
873};
874
875static struct uart_sio_port m32r_sio_ports[UART_NR];
876
877static void __init m32r_sio_init_ports(void)
878{
879 struct uart_sio_port *up;
880 static int first = 1;
881 int i;
882
883 if (!first)
884 return;
885 first = 0;
886
887 for (i = 0, up = m32r_sio_ports; i < UART_NR; i++, up++) {
888 up->port.iobase = old_serial_port[i].port;
889 up->port.irq = irq_canonicalize(old_serial_port[i].irq);
890 up->port.uartclk = BAUD_RATE * 16;
891 up->port.flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST;
892 up->port.membase = 0;
893 up->port.iotype = 0;
894 up->port.regshift = 0;
895 up->port.ops = &m32r_sio_pops;
896 }
897}
898
899static void __init m32r_sio_register_ports(struct uart_driver *drv)
900{
901 int i;
902
903 m32r_sio_init_ports();
904
905 for (i = 0; i < UART_NR; i++) {
906 struct uart_sio_port *up = &m32r_sio_ports[i];
907
908 up->port.line = i;
909 up->port.ops = &m32r_sio_pops;
910 init_timer(&up->timer);
911 up->timer.function = m32r_sio_timeout;
912
913 uart_add_one_port(drv, &up->port);
914 }
915}
916
917#ifdef CONFIG_SERIAL_M32R_SIO_CONSOLE
918
919/*
920 * Wait for transmitter & holding register to empty
921 */
922static void wait_for_xmitr(struct uart_sio_port *up)
923{
924 unsigned int status, tmout = 10000;
925
926 /* Wait up to 10ms for the character(s) to be sent. */
927 do {
928 status = sio_in(up, SIOSTS);
929
930 if (--tmout == 0)
931 break;
932 udelay(1);
933 } while ((status & UART_EMPTY) != UART_EMPTY);
934
935 /* Wait up to 1s for flow control if necessary */
936 if (up->port.flags & UPF_CONS_FLOW) {
937 tmout = 1000000;
938 while (--tmout)
939 udelay(1);
940 }
941}
942
943static void m32r_sio_console_putchar(struct uart_port *port, int ch)
944{
945 struct uart_sio_port *up =
946 container_of(port, struct uart_sio_port, port);
947
948 wait_for_xmitr(up);
949 sio_out(up, SIOTXB, ch);
950}
951
952/*
953 * Print a string to the serial port trying not to disturb
954 * any possible real use of the port...
955 *
956 * The console_lock must be held when we get here.
957 */
958static void m32r_sio_console_write(struct console *co, const char *s,
959 unsigned int count)
960{
961 struct uart_sio_port *up = &m32r_sio_ports[co->index];
962 unsigned int ier;
963
964 /*
965 * First save the UER then disable the interrupts
966 */
967 ier = sio_in(up, SIOTRCR);
968 sio_out(up, SIOTRCR, 0);
969
970 uart_console_write(&up->port, s, count, m32r_sio_console_putchar);
971
972 /*
973 * Finally, wait for transmitter to become empty
974 * and restore the IER
975 */
976 wait_for_xmitr(up);
977 sio_out(up, SIOTRCR, ier);
978}
979
980static int __init m32r_sio_console_setup(struct console *co, char *options)
981{
982 struct uart_port *port;
983 int baud = 9600;
984 int bits = 8;
985 int parity = 'n';
986 int flow = 'n';
987
988 /*
989 * Check whether an invalid uart number has been specified, and
990 * if so, search for the first available port that does have
991 * console support.
992 */
993 if (co->index >= UART_NR)
994 co->index = 0;
995 port = &m32r_sio_ports[co->index].port;
996
997 /*
998 * Temporary fix.
999 */
1000 spin_lock_init(&port->lock);
1001
1002 if (options)
1003 uart_parse_options(options, &baud, &parity, &bits, &flow);
1004
1005 return uart_set_options(port, co, baud, parity, bits, flow);
1006}
1007
1008static struct uart_driver m32r_sio_reg;
1009static struct console m32r_sio_console = {
1010 .name = "ttyS",
1011 .write = m32r_sio_console_write,
1012 .device = uart_console_device,
1013 .setup = m32r_sio_console_setup,
1014 .flags = CON_PRINTBUFFER,
1015 .index = -1,
1016 .data = &m32r_sio_reg,
1017};
1018
1019static int __init m32r_sio_console_init(void)
1020{
1021 sio_reset();
1022 sio_init();
1023 m32r_sio_init_ports();
1024 register_console(&m32r_sio_console);
1025 return 0;
1026}
1027console_initcall(m32r_sio_console_init);
1028
1029#define M32R_SIO_CONSOLE &m32r_sio_console
1030#else
1031#define M32R_SIO_CONSOLE NULL
1032#endif
1033
1034static struct uart_driver m32r_sio_reg = {
1035 .owner = THIS_MODULE,
1036 .driver_name = "sio",
1037 .dev_name = "ttyS",
1038 .major = TTY_MAJOR,
1039 .minor = 64,
1040 .nr = UART_NR,
1041 .cons = M32R_SIO_CONSOLE,
1042};
1043
1044static int __init m32r_sio_init(void)
1045{
1046 int ret, i;
1047
1048 printk(KERN_INFO "Serial: M32R SIO driver\n");
1049
1050 for (i = 0; i < nr_irqs; i++)
1051 spin_lock_init(&irq_lists[i].lock);
1052
1053 ret = uart_register_driver(&m32r_sio_reg);
1054 if (ret >= 0)
1055 m32r_sio_register_ports(&m32r_sio_reg);
1056
1057 return ret;
1058}
1059device_initcall(m32r_sio_init);