aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/tty/serial/m32r_sio.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/tty/serial/m32r_sio.c')
-rw-r--r--drivers/tty/serial/m32r_sio.c1192
1 files changed, 1192 insertions, 0 deletions
diff --git a/drivers/tty/serial/m32r_sio.c b/drivers/tty/serial/m32r_sio.c
new file mode 100644
index 000000000000..bea5c215460c
--- /dev/null
+++ b/drivers/tty/serial/m32r_sio.c
@@ -0,0 +1,1192 @@
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/module.h>
34#include <linux/tty.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/serialP.h>
41#include <linux/delay.h>
42
43#include <asm/m32r.h>
44#include <asm/io.h>
45#include <asm/irq.h>
46
47#define PORT_M32R_BASE PORT_M32R_SIO
48#define PORT_INDEX(x) (x - PORT_M32R_BASE + 1)
49#define BAUD_RATE 115200
50
51#include <linux/serial_core.h>
52#include "m32r_sio.h"
53#include "m32r_sio_reg.h"
54
55/*
56 * Debugging.
57 */
58#if 0
59#define DEBUG_AUTOCONF(fmt...) printk(fmt)
60#else
61#define DEBUG_AUTOCONF(fmt...) do { } while (0)
62#endif
63
64#if 0
65#define DEBUG_INTR(fmt...) printk(fmt)
66#else
67#define DEBUG_INTR(fmt...) do { } while (0)
68#endif
69
70#define PASS_LIMIT 256
71
72/*
73 * We default to IRQ0 for the "no irq" hack. Some
74 * machine types want others as well - they're free
75 * to redefine this in their header file.
76 */
77#define is_real_interrupt(irq) ((irq) != 0)
78
79#define BASE_BAUD 115200
80
81/* Standard COM flags */
82#define STD_COM_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST)
83
84/*
85 * SERIAL_PORT_DFNS tells us about built-in ports that have no
86 * standard enumeration mechanism. Platforms that can find all
87 * serial ports via mechanisms like ACPI or PCI need not supply it.
88 */
89#if defined(CONFIG_PLAT_USRV)
90
91#define SERIAL_PORT_DFNS \
92 /* UART CLK PORT IRQ FLAGS */ \
93 { 0, BASE_BAUD, 0x3F8, PLD_IRQ_UART0, STD_COM_FLAGS }, /* ttyS0 */ \
94 { 0, BASE_BAUD, 0x2F8, PLD_IRQ_UART1, STD_COM_FLAGS }, /* ttyS1 */
95
96#else /* !CONFIG_PLAT_USRV */
97
98#if defined(CONFIG_SERIAL_M32R_PLDSIO)
99#define SERIAL_PORT_DFNS \
100 { 0, BASE_BAUD, ((unsigned long)PLD_ESIO0CR), PLD_IRQ_SIO0_RCV, \
101 STD_COM_FLAGS }, /* ttyS0 */
102#else
103#define SERIAL_PORT_DFNS \
104 { 0, BASE_BAUD, M32R_SIO_OFFSET, M32R_IRQ_SIO0_R, \
105 STD_COM_FLAGS }, /* ttyS0 */
106#endif
107
108#endif /* !CONFIG_PLAT_USRV */
109
110static struct old_serial_port old_serial_port[] = {
111 SERIAL_PORT_DFNS
112};
113
114#define UART_NR ARRAY_SIZE(old_serial_port)
115
116struct uart_sio_port {
117 struct uart_port port;
118 struct timer_list timer; /* "no irq" timer */
119 struct list_head list; /* ports on this IRQ */
120 unsigned short rev;
121 unsigned char acr;
122 unsigned char ier;
123 unsigned char lcr;
124 unsigned char mcr_mask; /* mask of user bits */
125 unsigned char mcr_force; /* mask of forced bits */
126 unsigned char lsr_break_flag;
127
128 /*
129 * We provide a per-port pm hook.
130 */
131 void (*pm)(struct uart_port *port,
132 unsigned int state, unsigned int old);
133};
134
135struct irq_info {
136 spinlock_t lock;
137 struct list_head *head;
138};
139
140static struct irq_info irq_lists[NR_IRQS];
141
142/*
143 * Here we define the default xmit fifo size used for each type of UART.
144 */
145static const struct serial_uart_config uart_config[] = {
146 [PORT_UNKNOWN] = {
147 .name = "unknown",
148 .dfl_xmit_fifo_size = 1,
149 .flags = 0,
150 },
151 [PORT_INDEX(PORT_M32R_SIO)] = {
152 .name = "M32RSIO",
153 .dfl_xmit_fifo_size = 1,
154 .flags = 0,
155 },
156};
157
158#ifdef CONFIG_SERIAL_M32R_PLDSIO
159
160#define __sio_in(x) inw((unsigned long)(x))
161#define __sio_out(v,x) outw((v),(unsigned long)(x))
162
163static inline void sio_set_baud_rate(unsigned long baud)
164{
165 unsigned short sbaud;
166 sbaud = (boot_cpu_data.bus_clock / (baud * 4))-1;
167 __sio_out(sbaud, PLD_ESIO0BAUR);
168}
169
170static void sio_reset(void)
171{
172 unsigned short tmp;
173
174 tmp = __sio_in(PLD_ESIO0RXB);
175 tmp = __sio_in(PLD_ESIO0RXB);
176 tmp = __sio_in(PLD_ESIO0CR);
177 sio_set_baud_rate(BAUD_RATE);
178 __sio_out(0x0300, PLD_ESIO0CR);
179 __sio_out(0x0003, PLD_ESIO0CR);
180}
181
182static void sio_init(void)
183{
184 unsigned short tmp;
185
186 tmp = __sio_in(PLD_ESIO0RXB);
187 tmp = __sio_in(PLD_ESIO0RXB);
188 tmp = __sio_in(PLD_ESIO0CR);
189 __sio_out(0x0300, PLD_ESIO0CR);
190 __sio_out(0x0003, PLD_ESIO0CR);
191}
192
193static void sio_error(int *status)
194{
195 printk("SIO0 error[%04x]\n", *status);
196 do {
197 sio_init();
198 } while ((*status = __sio_in(PLD_ESIO0CR)) != 3);
199}
200
201#else /* not CONFIG_SERIAL_M32R_PLDSIO */
202
203#define __sio_in(x) inl(x)
204#define __sio_out(v,x) outl((v),(x))
205
206static inline void sio_set_baud_rate(unsigned long baud)
207{
208 unsigned long i, j;
209
210 i = boot_cpu_data.bus_clock / (baud * 16);
211 j = (boot_cpu_data.bus_clock - (i * baud * 16)) / baud;
212 i -= 1;
213 j = (j + 1) >> 1;
214
215 __sio_out(i, M32R_SIO0_BAUR_PORTL);
216 __sio_out(j, M32R_SIO0_RBAUR_PORTL);
217}
218
219static void sio_reset(void)
220{
221 __sio_out(0x00000300, M32R_SIO0_CR_PORTL); /* init status */
222 __sio_out(0x00000800, M32R_SIO0_MOD1_PORTL); /* 8bit */
223 __sio_out(0x00000080, M32R_SIO0_MOD0_PORTL); /* 1stop non */
224 sio_set_baud_rate(BAUD_RATE);
225 __sio_out(0x00000000, M32R_SIO0_TRCR_PORTL);
226 __sio_out(0x00000003, M32R_SIO0_CR_PORTL); /* RXCEN */
227}
228
229static void sio_init(void)
230{
231 unsigned int tmp;
232
233 tmp = __sio_in(M32R_SIO0_RXB_PORTL);
234 tmp = __sio_in(M32R_SIO0_RXB_PORTL);
235 tmp = __sio_in(M32R_SIO0_STS_PORTL);
236 __sio_out(0x00000003, M32R_SIO0_CR_PORTL);
237}
238
239static void sio_error(int *status)
240{
241 printk("SIO0 error[%04x]\n", *status);
242 do {
243 sio_init();
244 } while ((*status = __sio_in(M32R_SIO0_CR_PORTL)) != 3);
245}
246
247#endif /* CONFIG_SERIAL_M32R_PLDSIO */
248
249static unsigned int sio_in(struct uart_sio_port *up, int offset)
250{
251 return __sio_in(up->port.iobase + offset);
252}
253
254static void sio_out(struct uart_sio_port *up, int offset, int value)
255{
256 __sio_out(value, up->port.iobase + offset);
257}
258
259static unsigned int serial_in(struct uart_sio_port *up, int offset)
260{
261 if (!offset)
262 return 0;
263
264 return __sio_in(offset);
265}
266
267static void serial_out(struct uart_sio_port *up, int offset, int value)
268{
269 if (!offset)
270 return;
271
272 __sio_out(value, offset);
273}
274
275static void m32r_sio_stop_tx(struct uart_port *port)
276{
277 struct uart_sio_port *up = (struct uart_sio_port *)port;
278
279 if (up->ier & UART_IER_THRI) {
280 up->ier &= ~UART_IER_THRI;
281 serial_out(up, UART_IER, up->ier);
282 }
283}
284
285static void m32r_sio_start_tx(struct uart_port *port)
286{
287#ifdef CONFIG_SERIAL_M32R_PLDSIO
288 struct uart_sio_port *up = (struct uart_sio_port *)port;
289 struct circ_buf *xmit = &up->port.state->xmit;
290
291 if (!(up->ier & UART_IER_THRI)) {
292 up->ier |= UART_IER_THRI;
293 serial_out(up, UART_IER, up->ier);
294 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
295 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
296 up->port.icount.tx++;
297 }
298 while((serial_in(up, UART_LSR) & UART_EMPTY) != UART_EMPTY);
299#else
300 struct uart_sio_port *up = (struct uart_sio_port *)port;
301
302 if (!(up->ier & UART_IER_THRI)) {
303 up->ier |= UART_IER_THRI;
304 serial_out(up, UART_IER, up->ier);
305 }
306#endif
307}
308
309static void m32r_sio_stop_rx(struct uart_port *port)
310{
311 struct uart_sio_port *up = (struct uart_sio_port *)port;
312
313 up->ier &= ~UART_IER_RLSI;
314 up->port.read_status_mask &= ~UART_LSR_DR;
315 serial_out(up, UART_IER, up->ier);
316}
317
318static void m32r_sio_enable_ms(struct uart_port *port)
319{
320 struct uart_sio_port *up = (struct uart_sio_port *)port;
321
322 up->ier |= UART_IER_MSI;
323 serial_out(up, UART_IER, up->ier);
324}
325
326static void receive_chars(struct uart_sio_port *up, int *status)
327{
328 struct tty_struct *tty = up->port.state->port.tty;
329 unsigned char ch;
330 unsigned char flag;
331 int max_count = 256;
332
333 do {
334 ch = sio_in(up, SIORXB);
335 flag = TTY_NORMAL;
336 up->port.icount.rx++;
337
338 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
339 UART_LSR_FE | UART_LSR_OE))) {
340 /*
341 * For statistics only
342 */
343 if (*status & UART_LSR_BI) {
344 *status &= ~(UART_LSR_FE | UART_LSR_PE);
345 up->port.icount.brk++;
346 /*
347 * We do the SysRQ and SAK checking
348 * here because otherwise the break
349 * may get masked by ignore_status_mask
350 * or read_status_mask.
351 */
352 if (uart_handle_break(&up->port))
353 goto ignore_char;
354 } else if (*status & UART_LSR_PE)
355 up->port.icount.parity++;
356 else if (*status & UART_LSR_FE)
357 up->port.icount.frame++;
358 if (*status & UART_LSR_OE)
359 up->port.icount.overrun++;
360
361 /*
362 * Mask off conditions which should be ingored.
363 */
364 *status &= up->port.read_status_mask;
365
366 if (up->port.line == up->port.cons->index) {
367 /* Recover the break flag from console xmit */
368 *status |= up->lsr_break_flag;
369 up->lsr_break_flag = 0;
370 }
371
372 if (*status & UART_LSR_BI) {
373 DEBUG_INTR("handling break....");
374 flag = TTY_BREAK;
375 } else if (*status & UART_LSR_PE)
376 flag = TTY_PARITY;
377 else if (*status & UART_LSR_FE)
378 flag = TTY_FRAME;
379 }
380 if (uart_handle_sysrq_char(&up->port, ch))
381 goto ignore_char;
382 if ((*status & up->port.ignore_status_mask) == 0)
383 tty_insert_flip_char(tty, ch, flag);
384
385 if (*status & UART_LSR_OE) {
386 /*
387 * Overrun is special, since it's reported
388 * immediately, and doesn't affect the current
389 * character.
390 */
391 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
392 }
393 ignore_char:
394 *status = serial_in(up, UART_LSR);
395 } while ((*status & UART_LSR_DR) && (max_count-- > 0));
396 tty_flip_buffer_push(tty);
397}
398
399static void transmit_chars(struct uart_sio_port *up)
400{
401 struct circ_buf *xmit = &up->port.state->xmit;
402 int count;
403
404 if (up->port.x_char) {
405#ifndef CONFIG_SERIAL_M32R_PLDSIO /* XXX */
406 serial_out(up, UART_TX, up->port.x_char);
407#endif
408 up->port.icount.tx++;
409 up->port.x_char = 0;
410 return;
411 }
412 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
413 m32r_sio_stop_tx(&up->port);
414 return;
415 }
416
417 count = up->port.fifosize;
418 do {
419 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
420 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
421 up->port.icount.tx++;
422 if (uart_circ_empty(xmit))
423 break;
424 while (!(serial_in(up, UART_LSR) & UART_LSR_THRE));
425
426 } while (--count > 0);
427
428 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
429 uart_write_wakeup(&up->port);
430
431 DEBUG_INTR("THRE...");
432
433 if (uart_circ_empty(xmit))
434 m32r_sio_stop_tx(&up->port);
435}
436
437/*
438 * This handles the interrupt from one port.
439 */
440static inline void m32r_sio_handle_port(struct uart_sio_port *up,
441 unsigned int status)
442{
443 DEBUG_INTR("status = %x...", status);
444
445 if (status & 0x04)
446 receive_chars(up, &status);
447 if (status & 0x01)
448 transmit_chars(up);
449}
450
451/*
452 * This is the serial driver's interrupt routine.
453 *
454 * Arjan thinks the old way was overly complex, so it got simplified.
455 * Alan disagrees, saying that need the complexity to handle the weird
456 * nature of ISA shared interrupts. (This is a special exception.)
457 *
458 * In order to handle ISA shared interrupts properly, we need to check
459 * that all ports have been serviced, and therefore the ISA interrupt
460 * line has been de-asserted.
461 *
462 * This means we need to loop through all ports. checking that they
463 * don't have an interrupt pending.
464 */
465static irqreturn_t m32r_sio_interrupt(int irq, void *dev_id)
466{
467 struct irq_info *i = dev_id;
468 struct list_head *l, *end = NULL;
469 int pass_counter = 0;
470
471 DEBUG_INTR("m32r_sio_interrupt(%d)...", irq);
472
473#ifdef CONFIG_SERIAL_M32R_PLDSIO
474// if (irq == PLD_IRQ_SIO0_SND)
475// irq = PLD_IRQ_SIO0_RCV;
476#else
477 if (irq == M32R_IRQ_SIO0_S)
478 irq = M32R_IRQ_SIO0_R;
479#endif
480
481 spin_lock(&i->lock);
482
483 l = i->head;
484 do {
485 struct uart_sio_port *up;
486 unsigned int sts;
487
488 up = list_entry(l, struct uart_sio_port, list);
489
490 sts = sio_in(up, SIOSTS);
491 if (sts & 0x5) {
492 spin_lock(&up->port.lock);
493 m32r_sio_handle_port(up, sts);
494 spin_unlock(&up->port.lock);
495
496 end = NULL;
497 } else if (end == NULL)
498 end = l;
499
500 l = l->next;
501
502 if (l == i->head && pass_counter++ > PASS_LIMIT) {
503 if (sts & 0xe0)
504 sio_error(&sts);
505 break;
506 }
507 } while (l != end);
508
509 spin_unlock(&i->lock);
510
511 DEBUG_INTR("end.\n");
512
513 return IRQ_HANDLED;
514}
515
516/*
517 * To support ISA shared interrupts, we need to have one interrupt
518 * handler that ensures that the IRQ line has been deasserted
519 * before returning. Failing to do this will result in the IRQ
520 * line being stuck active, and, since ISA irqs are edge triggered,
521 * no more IRQs will be seen.
522 */
523static void serial_do_unlink(struct irq_info *i, struct uart_sio_port *up)
524{
525 spin_lock_irq(&i->lock);
526
527 if (!list_empty(i->head)) {
528 if (i->head == &up->list)
529 i->head = i->head->next;
530 list_del(&up->list);
531 } else {
532 BUG_ON(i->head != &up->list);
533 i->head = NULL;
534 }
535
536 spin_unlock_irq(&i->lock);
537}
538
539static int serial_link_irq_chain(struct uart_sio_port *up)
540{
541 struct irq_info *i = irq_lists + up->port.irq;
542 int ret, irq_flags = 0;
543
544 spin_lock_irq(&i->lock);
545
546 if (i->head) {
547 list_add(&up->list, i->head);
548 spin_unlock_irq(&i->lock);
549
550 ret = 0;
551 } else {
552 INIT_LIST_HEAD(&up->list);
553 i->head = &up->list;
554 spin_unlock_irq(&i->lock);
555
556 ret = request_irq(up->port.irq, m32r_sio_interrupt,
557 irq_flags, "SIO0-RX", i);
558 ret |= request_irq(up->port.irq + 1, m32r_sio_interrupt,
559 irq_flags, "SIO0-TX", i);
560 if (ret < 0)
561 serial_do_unlink(i, up);
562 }
563
564 return ret;
565}
566
567static void serial_unlink_irq_chain(struct uart_sio_port *up)
568{
569 struct irq_info *i = irq_lists + up->port.irq;
570
571 BUG_ON(i->head == NULL);
572
573 if (list_empty(i->head)) {
574 free_irq(up->port.irq, i);
575 free_irq(up->port.irq + 1, i);
576 }
577
578 serial_do_unlink(i, up);
579}
580
581/*
582 * This function is used to handle ports that do not have an interrupt.
583 */
584static void m32r_sio_timeout(unsigned long data)
585{
586 struct uart_sio_port *up = (struct uart_sio_port *)data;
587 unsigned int timeout;
588 unsigned int sts;
589
590 sts = sio_in(up, SIOSTS);
591 if (sts & 0x5) {
592 spin_lock(&up->port.lock);
593 m32r_sio_handle_port(up, sts);
594 spin_unlock(&up->port.lock);
595 }
596
597 timeout = up->port.timeout;
598 timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
599 mod_timer(&up->timer, jiffies + timeout);
600}
601
602static unsigned int m32r_sio_tx_empty(struct uart_port *port)
603{
604 struct uart_sio_port *up = (struct uart_sio_port *)port;
605 unsigned long flags;
606 unsigned int ret;
607
608 spin_lock_irqsave(&up->port.lock, flags);
609 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
610 spin_unlock_irqrestore(&up->port.lock, flags);
611
612 return ret;
613}
614
615static unsigned int m32r_sio_get_mctrl(struct uart_port *port)
616{
617 return 0;
618}
619
620static void m32r_sio_set_mctrl(struct uart_port *port, unsigned int mctrl)
621{
622
623}
624
625static void m32r_sio_break_ctl(struct uart_port *port, int break_state)
626{
627
628}
629
630static int m32r_sio_startup(struct uart_port *port)
631{
632 struct uart_sio_port *up = (struct uart_sio_port *)port;
633 int retval;
634
635 sio_init();
636
637 /*
638 * If the "interrupt" for this port doesn't correspond with any
639 * hardware interrupt, we use a timer-based system. The original
640 * driver used to do this with IRQ0.
641 */
642 if (!is_real_interrupt(up->port.irq)) {
643 unsigned int timeout = up->port.timeout;
644
645 timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
646
647 up->timer.data = (unsigned long)up;
648 mod_timer(&up->timer, jiffies + timeout);
649 } else {
650 retval = serial_link_irq_chain(up);
651 if (retval)
652 return retval;
653 }
654
655 /*
656 * Finally, enable interrupts. Note: Modem status interrupts
657 * are set via set_termios(), which will be occurring imminently
658 * anyway, so we don't enable them here.
659 * - M32R_SIO: 0x0c
660 * - M32R_PLDSIO: 0x04
661 */
662 up->ier = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
663 sio_out(up, SIOTRCR, up->ier);
664
665 /*
666 * And clear the interrupt registers again for luck.
667 */
668 sio_reset();
669
670 return 0;
671}
672
673static void m32r_sio_shutdown(struct uart_port *port)
674{
675 struct uart_sio_port *up = (struct uart_sio_port *)port;
676
677 /*
678 * Disable interrupts from this port
679 */
680 up->ier = 0;
681 sio_out(up, SIOTRCR, 0);
682
683 /*
684 * Disable break condition and FIFOs
685 */
686
687 sio_init();
688
689 if (!is_real_interrupt(up->port.irq))
690 del_timer_sync(&up->timer);
691 else
692 serial_unlink_irq_chain(up);
693}
694
695static unsigned int m32r_sio_get_divisor(struct uart_port *port,
696 unsigned int baud)
697{
698 return uart_get_divisor(port, baud);
699}
700
701static void m32r_sio_set_termios(struct uart_port *port,
702 struct ktermios *termios, struct ktermios *old)
703{
704 struct uart_sio_port *up = (struct uart_sio_port *)port;
705 unsigned char cval = 0;
706 unsigned long flags;
707 unsigned int baud, quot;
708
709 switch (termios->c_cflag & CSIZE) {
710 case CS5:
711 cval = UART_LCR_WLEN5;
712 break;
713 case CS6:
714 cval = UART_LCR_WLEN6;
715 break;
716 case CS7:
717 cval = UART_LCR_WLEN7;
718 break;
719 default:
720 case CS8:
721 cval = UART_LCR_WLEN8;
722 break;
723 }
724
725 if (termios->c_cflag & CSTOPB)
726 cval |= UART_LCR_STOP;
727 if (termios->c_cflag & PARENB)
728 cval |= UART_LCR_PARITY;
729 if (!(termios->c_cflag & PARODD))
730 cval |= UART_LCR_EPAR;
731#ifdef CMSPAR
732 if (termios->c_cflag & CMSPAR)
733 cval |= UART_LCR_SPAR;
734#endif
735
736 /*
737 * Ask the core to calculate the divisor for us.
738 */
739#ifdef CONFIG_SERIAL_M32R_PLDSIO
740 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/4);
741#else
742 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
743#endif
744 quot = m32r_sio_get_divisor(port, baud);
745
746 /*
747 * Ok, we're now changing the port state. Do it with
748 * interrupts disabled.
749 */
750 spin_lock_irqsave(&up->port.lock, flags);
751
752 sio_set_baud_rate(baud);
753
754 /*
755 * Update the per-port timeout.
756 */
757 uart_update_timeout(port, termios->c_cflag, baud);
758
759 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
760 if (termios->c_iflag & INPCK)
761 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
762 if (termios->c_iflag & (BRKINT | PARMRK))
763 up->port.read_status_mask |= UART_LSR_BI;
764
765 /*
766 * Characteres to ignore
767 */
768 up->port.ignore_status_mask = 0;
769 if (termios->c_iflag & IGNPAR)
770 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
771 if (termios->c_iflag & IGNBRK) {
772 up->port.ignore_status_mask |= UART_LSR_BI;
773 /*
774 * If we're ignoring parity and break indicators,
775 * ignore overruns too (for real raw support).
776 */
777 if (termios->c_iflag & IGNPAR)
778 up->port.ignore_status_mask |= UART_LSR_OE;
779 }
780
781 /*
782 * ignore all characters if CREAD is not set
783 */
784 if ((termios->c_cflag & CREAD) == 0)
785 up->port.ignore_status_mask |= UART_LSR_DR;
786
787 /*
788 * CTS flow control flag and modem status interrupts
789 */
790 up->ier &= ~UART_IER_MSI;
791 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
792 up->ier |= UART_IER_MSI;
793
794 serial_out(up, UART_IER, up->ier);
795
796 up->lcr = cval; /* Save LCR */
797 spin_unlock_irqrestore(&up->port.lock, flags);
798}
799
800static void m32r_sio_pm(struct uart_port *port, unsigned int state,
801 unsigned int oldstate)
802{
803 struct uart_sio_port *up = (struct uart_sio_port *)port;
804
805 if (up->pm)
806 up->pm(port, state, oldstate);
807}
808
809/*
810 * Resource handling. This is complicated by the fact that resources
811 * depend on the port type. Maybe we should be claiming the standard
812 * 8250 ports, and then trying to get other resources as necessary?
813 */
814static int
815m32r_sio_request_std_resource(struct uart_sio_port *up, struct resource **res)
816{
817 unsigned int size = 8 << up->port.regshift;
818#ifndef CONFIG_SERIAL_M32R_PLDSIO
819 unsigned long start;
820#endif
821 int ret = 0;
822
823 switch (up->port.iotype) {
824 case UPIO_MEM:
825 if (up->port.mapbase) {
826#ifdef CONFIG_SERIAL_M32R_PLDSIO
827 *res = request_mem_region(up->port.mapbase, size, "serial");
828#else
829 start = up->port.mapbase;
830 *res = request_mem_region(start, size, "serial");
831#endif
832 if (!*res)
833 ret = -EBUSY;
834 }
835 break;
836
837 case UPIO_PORT:
838 *res = request_region(up->port.iobase, size, "serial");
839 if (!*res)
840 ret = -EBUSY;
841 break;
842 }
843 return ret;
844}
845
846static void m32r_sio_release_port(struct uart_port *port)
847{
848 struct uart_sio_port *up = (struct uart_sio_port *)port;
849 unsigned long start, offset = 0, size = 0;
850
851 size <<= up->port.regshift;
852
853 switch (up->port.iotype) {
854 case UPIO_MEM:
855 if (up->port.mapbase) {
856 /*
857 * Unmap the area.
858 */
859 iounmap(up->port.membase);
860 up->port.membase = NULL;
861
862 start = up->port.mapbase;
863
864 if (size)
865 release_mem_region(start + offset, size);
866 release_mem_region(start, 8 << up->port.regshift);
867 }
868 break;
869
870 case UPIO_PORT:
871 start = up->port.iobase;
872
873 if (size)
874 release_region(start + offset, size);
875 release_region(start + offset, 8 << up->port.regshift);
876 break;
877
878 default:
879 break;
880 }
881}
882
883static int m32r_sio_request_port(struct uart_port *port)
884{
885 struct uart_sio_port *up = (struct uart_sio_port *)port;
886 struct resource *res = NULL;
887 int ret = 0;
888
889 ret = m32r_sio_request_std_resource(up, &res);
890
891 /*
892 * If we have a mapbase, then request that as well.
893 */
894 if (ret == 0 && up->port.flags & UPF_IOREMAP) {
895 int size = res->end - res->start + 1;
896
897 up->port.membase = ioremap(up->port.mapbase, size);
898 if (!up->port.membase)
899 ret = -ENOMEM;
900 }
901
902 if (ret < 0) {
903 if (res)
904 release_resource(res);
905 }
906
907 return ret;
908}
909
910static void m32r_sio_config_port(struct uart_port *port, int flags)
911{
912 struct uart_sio_port *up = (struct uart_sio_port *)port;
913
914 spin_lock_irqsave(&up->port.lock, flags);
915
916 up->port.type = (PORT_M32R_SIO - PORT_M32R_BASE + 1);
917 up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size;
918
919 spin_unlock_irqrestore(&up->port.lock, flags);
920}
921
922static int
923m32r_sio_verify_port(struct uart_port *port, struct serial_struct *ser)
924{
925 if (ser->irq >= nr_irqs || ser->irq < 0 ||
926 ser->baud_base < 9600 || ser->type < PORT_UNKNOWN ||
927 ser->type >= ARRAY_SIZE(uart_config))
928 return -EINVAL;
929 return 0;
930}
931
932static const char *
933m32r_sio_type(struct uart_port *port)
934{
935 int type = port->type;
936
937 if (type >= ARRAY_SIZE(uart_config))
938 type = 0;
939 return uart_config[type].name;
940}
941
942static struct uart_ops m32r_sio_pops = {
943 .tx_empty = m32r_sio_tx_empty,
944 .set_mctrl = m32r_sio_set_mctrl,
945 .get_mctrl = m32r_sio_get_mctrl,
946 .stop_tx = m32r_sio_stop_tx,
947 .start_tx = m32r_sio_start_tx,
948 .stop_rx = m32r_sio_stop_rx,
949 .enable_ms = m32r_sio_enable_ms,
950 .break_ctl = m32r_sio_break_ctl,
951 .startup = m32r_sio_startup,
952 .shutdown = m32r_sio_shutdown,
953 .set_termios = m32r_sio_set_termios,
954 .pm = m32r_sio_pm,
955 .type = m32r_sio_type,
956 .release_port = m32r_sio_release_port,
957 .request_port = m32r_sio_request_port,
958 .config_port = m32r_sio_config_port,
959 .verify_port = m32r_sio_verify_port,
960};
961
962static struct uart_sio_port m32r_sio_ports[UART_NR];
963
964static void __init m32r_sio_init_ports(void)
965{
966 struct uart_sio_port *up;
967 static int first = 1;
968 int i;
969
970 if (!first)
971 return;
972 first = 0;
973
974 for (i = 0, up = m32r_sio_ports; i < ARRAY_SIZE(old_serial_port);
975 i++, up++) {
976 up->port.iobase = old_serial_port[i].port;
977 up->port.irq = irq_canonicalize(old_serial_port[i].irq);
978 up->port.uartclk = old_serial_port[i].baud_base * 16;
979 up->port.flags = old_serial_port[i].flags;
980 up->port.membase = old_serial_port[i].iomem_base;
981 up->port.iotype = old_serial_port[i].io_type;
982 up->port.regshift = old_serial_port[i].iomem_reg_shift;
983 up->port.ops = &m32r_sio_pops;
984 }
985}
986
987static void __init m32r_sio_register_ports(struct uart_driver *drv)
988{
989 int i;
990
991 m32r_sio_init_ports();
992
993 for (i = 0; i < UART_NR; i++) {
994 struct uart_sio_port *up = &m32r_sio_ports[i];
995
996 up->port.line = i;
997 up->port.ops = &m32r_sio_pops;
998 init_timer(&up->timer);
999 up->timer.function = m32r_sio_timeout;
1000
1001 /*
1002 * ALPHA_KLUDGE_MCR needs to be killed.
1003 */
1004 up->mcr_mask = ~ALPHA_KLUDGE_MCR;
1005 up->mcr_force = ALPHA_KLUDGE_MCR;
1006
1007 uart_add_one_port(drv, &up->port);
1008 }
1009}
1010
1011#ifdef CONFIG_SERIAL_M32R_SIO_CONSOLE
1012
1013/*
1014 * Wait for transmitter & holding register to empty
1015 */
1016static inline void wait_for_xmitr(struct uart_sio_port *up)
1017{
1018 unsigned int status, tmout = 10000;
1019
1020 /* Wait up to 10ms for the character(s) to be sent. */
1021 do {
1022 status = sio_in(up, SIOSTS);
1023
1024 if (--tmout == 0)
1025 break;
1026 udelay(1);
1027 } while ((status & UART_EMPTY) != UART_EMPTY);
1028
1029 /* Wait up to 1s for flow control if necessary */
1030 if (up->port.flags & UPF_CONS_FLOW) {
1031 tmout = 1000000;
1032 while (--tmout)
1033 udelay(1);
1034 }
1035}
1036
1037static void m32r_sio_console_putchar(struct uart_port *port, int ch)
1038{
1039 struct uart_sio_port *up = (struct uart_sio_port *)port;
1040
1041 wait_for_xmitr(up);
1042 sio_out(up, SIOTXB, ch);
1043}
1044
1045/*
1046 * Print a string to the serial port trying not to disturb
1047 * any possible real use of the port...
1048 *
1049 * The console_lock must be held when we get here.
1050 */
1051static void m32r_sio_console_write(struct console *co, const char *s,
1052 unsigned int count)
1053{
1054 struct uart_sio_port *up = &m32r_sio_ports[co->index];
1055 unsigned int ier;
1056
1057 /*
1058 * First save the UER then disable the interrupts
1059 */
1060 ier = sio_in(up, SIOTRCR);
1061 sio_out(up, SIOTRCR, 0);
1062
1063 uart_console_write(&up->port, s, count, m32r_sio_console_putchar);
1064
1065 /*
1066 * Finally, wait for transmitter to become empty
1067 * and restore the IER
1068 */
1069 wait_for_xmitr(up);
1070 sio_out(up, SIOTRCR, ier);
1071}
1072
1073static int __init m32r_sio_console_setup(struct console *co, char *options)
1074{
1075 struct uart_port *port;
1076 int baud = 9600;
1077 int bits = 8;
1078 int parity = 'n';
1079 int flow = 'n';
1080
1081 /*
1082 * Check whether an invalid uart number has been specified, and
1083 * if so, search for the first available port that does have
1084 * console support.
1085 */
1086 if (co->index >= UART_NR)
1087 co->index = 0;
1088 port = &m32r_sio_ports[co->index].port;
1089
1090 /*
1091 * Temporary fix.
1092 */
1093 spin_lock_init(&port->lock);
1094
1095 if (options)
1096 uart_parse_options(options, &baud, &parity, &bits, &flow);
1097
1098 return uart_set_options(port, co, baud, parity, bits, flow);
1099}
1100
1101static struct uart_driver m32r_sio_reg;
1102static struct console m32r_sio_console = {
1103 .name = "ttyS",
1104 .write = m32r_sio_console_write,
1105 .device = uart_console_device,
1106 .setup = m32r_sio_console_setup,
1107 .flags = CON_PRINTBUFFER,
1108 .index = -1,
1109 .data = &m32r_sio_reg,
1110};
1111
1112static int __init m32r_sio_console_init(void)
1113{
1114 sio_reset();
1115 sio_init();
1116 m32r_sio_init_ports();
1117 register_console(&m32r_sio_console);
1118 return 0;
1119}
1120console_initcall(m32r_sio_console_init);
1121
1122#define M32R_SIO_CONSOLE &m32r_sio_console
1123#else
1124#define M32R_SIO_CONSOLE NULL
1125#endif
1126
1127static struct uart_driver m32r_sio_reg = {
1128 .owner = THIS_MODULE,
1129 .driver_name = "sio",
1130 .dev_name = "ttyS",
1131 .major = TTY_MAJOR,
1132 .minor = 64,
1133 .nr = UART_NR,
1134 .cons = M32R_SIO_CONSOLE,
1135};
1136
1137/**
1138 * m32r_sio_suspend_port - suspend one serial port
1139 * @line: serial line number
1140 *
1141 * Suspend one serial port.
1142 */
1143void m32r_sio_suspend_port(int line)
1144{
1145 uart_suspend_port(&m32r_sio_reg, &m32r_sio_ports[line].port);
1146}
1147
1148/**
1149 * m32r_sio_resume_port - resume one serial port
1150 * @line: serial line number
1151 *
1152 * Resume one serial port.
1153 */
1154void m32r_sio_resume_port(int line)
1155{
1156 uart_resume_port(&m32r_sio_reg, &m32r_sio_ports[line].port);
1157}
1158
1159static int __init m32r_sio_init(void)
1160{
1161 int ret, i;
1162
1163 printk(KERN_INFO "Serial: M32R SIO driver\n");
1164
1165 for (i = 0; i < nr_irqs; i++)
1166 spin_lock_init(&irq_lists[i].lock);
1167
1168 ret = uart_register_driver(&m32r_sio_reg);
1169 if (ret >= 0)
1170 m32r_sio_register_ports(&m32r_sio_reg);
1171
1172 return ret;
1173}
1174
1175static void __exit m32r_sio_exit(void)
1176{
1177 int i;
1178
1179 for (i = 0; i < UART_NR; i++)
1180 uart_remove_one_port(&m32r_sio_reg, &m32r_sio_ports[i].port);
1181
1182 uart_unregister_driver(&m32r_sio_reg);
1183}
1184
1185module_init(m32r_sio_init);
1186module_exit(m32r_sio_exit);
1187
1188EXPORT_SYMBOL(m32r_sio_suspend_port);
1189EXPORT_SYMBOL(m32r_sio_resume_port);
1190
1191MODULE_LICENSE("GPL");
1192MODULE_DESCRIPTION("Generic M32R SIO serial driver");
generated by cgit v1.2.2 (git 2.25.0) at 2025-11-02 01:27:14 -0500