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[PATCH] Kconfig fix (infiniband and PCI)
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / serial / sh-sci.c
blobad5b776d779b3ca56a8db712ddd89defefe2dbce
1 /*
2 * drivers/serial/sh-sci.c
3 *
4 * SuperH on-chip serial module support. (SCI with no FIFO / with FIFO)
5 *
6 * Copyright (C) 2002, 2003, 2004 Paul Mundt
7 *
8 * based off of the old drivers/char/sh-sci.c by:
9 *
10 * Copyright (C) 1999, 2000 Niibe Yutaka
11 * Copyright (C) 2000 Sugioka Toshinobu
12 * Modified to support multiple serial ports. Stuart Menefy (May 2000).
13 * Modified to support SecureEdge. David McCullough (2002)
14 * Modified to support SH7300 SCIF. Takashi Kusuda (Jun 2003).
15 *
16 * This file is subject to the terms and conditions of the GNU General Public
17 * License. See the file "COPYING" in the main directory of this archive
18 * for more details.
19 */
20
21 #undef DEBUG
22
23 #include <linux/config.h>
24 #include <linux/module.h>
25 #include <linux/errno.h>
26 #include <linux/signal.h>
27 #include <linux/sched.h>
28 #include <linux/timer.h>
29 #include <linux/interrupt.h>
30 #include <linux/tty.h>
31 #include <linux/tty_flip.h>
32 #include <linux/serial.h>
33 #include <linux/major.h>
34 #include <linux/string.h>
35 #include <linux/sysrq.h>
36 #include <linux/fcntl.h>
37 #include <linux/ptrace.h>
38 #include <linux/ioport.h>
39 #include <linux/mm.h>
40 #include <linux/slab.h>
41 #include <linux/init.h>
42 #include <linux/delay.h>
43 #include <linux/console.h>
44 #include <linux/bitops.h>
45
46 #ifdef CONFIG_CPU_FREQ
47 #include <linux/notifier.h>
48 #include <linux/cpufreq.h>
49 #endif
50
51 #include <asm/system.h>
52 #include <asm/io.h>
53 #include <asm/irq.h>
54 #include <asm/uaccess.h>
55
56 #include <linux/generic_serial.h>
57
58 #ifdef CONFIG_SH_STANDARD_BIOS
59 #include <asm/sh_bios.h>
60 #endif
61
62 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
63 #define SUPPORT_SYSRQ
64 #endif
65
66 #include "sh-sci.h"
67
68 #ifdef CONFIG_SH_KGDB
69 #include <asm/kgdb.h>
70
71 static int kgdb_get_char(struct sci_port *port);
72 static void kgdb_put_char(struct sci_port *port, char c);
73 static void kgdb_handle_error(struct sci_port *port);
74 static struct sci_port *kgdb_sci_port;
75 #endif /* CONFIG_SH_KGDB */
76
77 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
78 static struct sci_port *serial_console_port = 0;
79 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
80
81 /* Function prototypes */
82 static void sci_stop_tx(struct uart_port *port, unsigned int tty_stop);
83 static void sci_start_tx(struct uart_port *port, unsigned int tty_start);
84 static void sci_start_rx(struct uart_port *port, unsigned int tty_start);
85 static void sci_stop_rx(struct uart_port *port);
86 static int sci_request_irq(struct sci_port *port);
87 static void sci_free_irq(struct sci_port *port);
88
89 static struct sci_port sci_ports[SCI_NPORTS];
90 static struct uart_driver sci_uart_driver;
91
92 #if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
93
94 static void handle_error(struct uart_port *port)
95 { /* Clear error flags */
96 sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
97 }
98
99 static int get_char(struct uart_port *port)
100 {
101 unsigned long flags;
102 unsigned short status;
103 int c;
104
105 local_irq_save(flags);
106 do {
107 status = sci_in(port, SCxSR);
108 if (status & SCxSR_ERRORS(port)) {
109 handle_error(port);
110 continue;
111 }
112 } while (!(status & SCxSR_RDxF(port)));
113 c = sci_in(port, SCxRDR);
114 sci_in(port, SCxSR); /* Dummy read */
115 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
116 local_irq_restore(flags);
117
118 return c;
119 }
120
121 /* Taken from sh-stub.c of GDB 4.18 */
122 static const char hexchars[] = "0123456789abcdef";
123
124 static __inline__ char highhex(int x)
125 {
126 return hexchars[(x >> 4) & 0xf];
127 }
128
129 static __inline__ char lowhex(int x)
130 {
131 return hexchars[x & 0xf];
132 }
133
134 #endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
135
136 /*
137 * Send the packet in buffer. The host gets one chance to read it.
138 * This routine does not wait for a positive acknowledge.
139 */
140
141 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
142 static void put_char(struct uart_port *port, char c)
143 {
144 unsigned long flags;
145 unsigned short status;
146
147 local_irq_save(flags);
148
149 do {
150 status = sci_in(port, SCxSR);
151 } while (!(status & SCxSR_TDxE(port)));
152
153 sci_out(port, SCxTDR, c);
154 sci_in(port, SCxSR); /* Dummy read */
155 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
156
157 local_irq_restore(flags);
158 }
159
160 static void put_string(struct sci_port *sci_port, const char *buffer, int count)
161 {
162 struct uart_port *port = &sci_port->port;
163 const unsigned char *p = buffer;
164 int i;
165
166 #if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
167 int checksum;
168 int usegdb=0;
169
170 #ifdef CONFIG_SH_STANDARD_BIOS
171 /* This call only does a trap the first time it is
172 * called, and so is safe to do here unconditionally
173 */
174 usegdb |= sh_bios_in_gdb_mode();
175 #endif
176 #ifdef CONFIG_SH_KGDB
177 usegdb |= (kgdb_in_gdb_mode && (port == kgdb_sci_port));
178 #endif
179
180 if (usegdb) {
181 /* $<packet info>#<checksum>. */
182 do {
183 unsigned char c;
184 put_char(port, '$');
185 put_char(port, 'O'); /* 'O'utput to console */
186 checksum = 'O';
187
188 for (i=0; i<count; i++) { /* Don't use run length encoding */
189 int h, l;
190
191 c = *p++;
192 h = highhex(c);
193 l = lowhex(c);
194 put_char(port, h);
195 put_char(port, l);
196 checksum += h + l;
197 }
198 put_char(port, '#');
199 put_char(port, highhex(checksum));
200 put_char(port, lowhex(checksum));
201 } while (get_char(port) != '+');
202 } else
203 #endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
204 for (i=0; i<count; i++) {
205 if (*p == 10)
206 put_char(port, '\r');
207 put_char(port, *p++);
208 }
209 }
210 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
211
212
213 #ifdef CONFIG_SH_KGDB
214
215 /* Is the SCI ready, ie is there a char waiting? */
216 static int kgdb_is_char_ready(struct sci_port *port)
217 {
218 unsigned short status = sci_in(port, SCxSR);
219
220 if (status & (SCxSR_ERRORS(port) | SCxSR_BRK(port)))
221 kgdb_handle_error(port);
222
223 return (status & SCxSR_RDxF(port));
224 }
225
226 /* Write a char */
227 static void kgdb_put_char(struct sci_port *port, char c)
228 {
229 unsigned short status;
230
231 do
232 status = sci_in(port, SCxSR);
233 while (!(status & SCxSR_TDxE(port)));
234
235 sci_out(port, SCxTDR, c);
236 sci_in(port, SCxSR); /* Dummy read */
237 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
238 }
239
240 /* Get a char if there is one, else ret -1 */
241 static int kgdb_get_char(struct sci_port *port)
242 {
243 int c;
244
245 if (kgdb_is_char_ready(port) == 0)
246 c = -1;
247 else {
248 c = sci_in(port, SCxRDR);
249 sci_in(port, SCxSR); /* Dummy read */
250 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
251 }
252
253 return c;
254 }
255
256 /* Called from kgdbstub.c to get a character, i.e. is blocking */
257 static int kgdb_sci_getchar(void)
258 {
259 volatile int c;
260
261 /* Keep trying to read a character, this could be neater */
262 while ((c = kgdb_get_char(kgdb_sci_port)) < 0);
263
264 return c;
265 }
266
267 /* Called from kgdbstub.c to put a character, just a wrapper */
268 static void kgdb_sci_putchar(int c)
269 {
270
271 kgdb_put_char(kgdb_sci_port, c);
272 }
273
274 /* Clear any errors on the SCI */
275 static void kgdb_handle_error(struct sci_port *port)
276 {
277 sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port)); /* Clear error flags */
278 }
279
280 /* Breakpoint if there's a break sent on the serial port */
281 static void kgdb_break_interrupt(int irq, void *ptr, struct pt_regs *regs)
282 {
283 struct sci_port *port = ptr;
284 unsigned short status = sci_in(port, SCxSR);
285
286 if (status & SCxSR_BRK(port)) {
287
288 /* Break into the debugger if a break is detected */
289 BREAKPOINT();
290
291 /* Clear */
292 sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port));
293 }
294 }
295
296 #endif /* CONFIG_SH_KGDB */
297
298 #if defined(__H8300S__)
299 enum { sci_disable, sci_enable };
300
301 static void h8300_sci_enable(struct uart_port* port, unsigned int ctrl)
302 {
303 volatile unsigned char *mstpcrl=(volatile unsigned char *)MSTPCRL;
304 int ch = (port->mapbase - SMR0) >> 3;
305 unsigned char mask = 1 << (ch+1);
306
307 if (ctrl == sci_disable) {
308 *mstpcrl |= mask;
309 } else {
310 *mstpcrl &= ~mask;
311 }
312 }
313 #endif
314
315 #if defined(SCI_ONLY) || defined(SCI_AND_SCIF)
316 #if defined(__H8300H__) || defined(__H8300S__)
317 static void sci_init_pins_sci(struct uart_port* port, unsigned int cflag)
318 {
319 int ch = (port->mapbase - SMR0) >> 3;
320
321 /* set DDR regs */
322 H8300_GPIO_DDR(h8300_sci_pins[ch].port,h8300_sci_pins[ch].rx,H8300_GPIO_INPUT);
323 H8300_GPIO_DDR(h8300_sci_pins[ch].port,h8300_sci_pins[ch].tx,H8300_GPIO_OUTPUT);
324 /* tx mark output*/
325 H8300_SCI_DR(ch) |= h8300_sci_pins[ch].tx;
326 }
327 #else
328 static void sci_init_pins_sci(struct uart_port *port, unsigned int cflag)
329 {
330 }
331 #endif
332 #endif
333
334 #if defined(SCIF_ONLY) || defined(SCI_AND_SCIF)
335 #if defined(CONFIG_CPU_SH3)
336 /* For SH7705, SH7707, SH7709, SH7709A, SH7729, SH7300*/
337 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
338 {
339 unsigned int fcr_val = 0;
340 #if !defined(CONFIG_CPU_SUBTYPE_SH7300) /* SH7300 doesn't use RTS/CTS */
341 {
342 unsigned short data;
343
344 /* We need to set SCPCR to enable RTS/CTS */
345 data = ctrl_inw(SCPCR);
346 /* Clear out SCP7MD1,0, SCP6MD1,0, SCP4MD1,0*/
347 ctrl_outw(data&0x0fcf, SCPCR);
348 }
349 if (cflag & CRTSCTS)
350 fcr_val |= SCFCR_MCE;
351 else {
352 unsigned short data;
353
354 /* We need to set SCPCR to enable RTS/CTS */
355 data = ctrl_inw(SCPCR);
356 /* Clear out SCP7MD1,0, SCP4MD1,0,
357 Set SCP6MD1,0 = {01} (output) */
358 ctrl_outw((data&0x0fcf)|0x1000, SCPCR);
359
360 data = ctrl_inb(SCPDR);
361 /* Set /RTS2 (bit6) = 0 */
362 ctrl_outb(data&0xbf, SCPDR);
363 }
364 #endif
365 sci_out(port, SCFCR, fcr_val);
366 }
367
368 static void sci_init_pins_irda(struct uart_port *port, unsigned int cflag)
369 {
370 unsigned int fcr_val = 0;
371
372 if (cflag & CRTSCTS)
373 fcr_val |= SCFCR_MCE;
374
375 sci_out(port, SCFCR, fcr_val);
376 }
377
378 #else
379
380 /* For SH7750 */
381 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
382 {
383 unsigned int fcr_val = 0;
384
385 if (cflag & CRTSCTS) {
386 fcr_val |= SCFCR_MCE;
387 } else {
388 ctrl_outw(0x0080, SCSPTR2); /* Set RTS = 1 */
389 }
390 sci_out(port, SCFCR, fcr_val);
391 }
392
393 #endif
394 #endif /* SCIF_ONLY || SCI_AND_SCIF */
395
396 /* ********************************************************************** *
397 * the interrupt related routines *
398 * ********************************************************************** */
399
400 static void sci_transmit_chars(struct uart_port *port)
401 {
402 struct circ_buf *xmit = &port->info->xmit;
403 unsigned int stopped = uart_tx_stopped(port);
404 unsigned long flags;
405 unsigned short status;
406 unsigned short ctrl;
407 int count, txroom;
408
409 status = sci_in(port, SCxSR);
410 if (!(status & SCxSR_TDxE(port))) {
411 local_irq_save(flags);
412 ctrl = sci_in(port, SCSCR);
413 if (uart_circ_empty(xmit)) {
414 ctrl &= ~SCI_CTRL_FLAGS_TIE;
415 } else {
416 ctrl |= SCI_CTRL_FLAGS_TIE;
417 }
418 sci_out(port, SCSCR, ctrl);
419 local_irq_restore(flags);
420 return;
421 }
422
423 #if !defined(SCI_ONLY)
424 if (port->type == PORT_SCIF) {
425 txroom = SCIF_TXROOM_MAX - (sci_in(port, SCFDR)>>8);
426 } else {
427 txroom = (sci_in(port, SCxSR) & SCI_TDRE)?1:0;
428 }
429 #else
430 txroom = (sci_in(port, SCxSR) & SCI_TDRE)?1:0;
431 #endif
432
433 count = txroom;
434
435 do {
436 unsigned char c;
437
438 if (port->x_char) {
439 c = port->x_char;
440 port->x_char = 0;
441 } else if (!uart_circ_empty(xmit) && !stopped) {
442 c = xmit->buf[xmit->tail];
443 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
444 } else {
445 break;
446 }
447
448 sci_out(port, SCxTDR, c);
449
450 port->icount.tx++;
451 } while (--count > 0);
452
453 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
454
455 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
456 uart_write_wakeup(port);
457 if (uart_circ_empty(xmit)) {
458 sci_stop_tx(port, 0);
459 } else {
460 local_irq_save(flags);
461 ctrl = sci_in(port, SCSCR);
462
463 #if !defined(SCI_ONLY)
464 if (port->type == PORT_SCIF) {
465 sci_in(port, SCxSR); /* Dummy read */
466 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
467 }
468 #endif
469
470 ctrl |= SCI_CTRL_FLAGS_TIE;
471 sci_out(port, SCSCR, ctrl);
472 local_irq_restore(flags);
473 }
474 }
475
476 /* On SH3, SCIF may read end-of-break as a space->mark char */
477 #define STEPFN(c) ({int __c=(c); (((__c-1)|(__c)) == -1); })
478
479 static inline void sci_receive_chars(struct uart_port *port,
480 struct pt_regs *regs)
481 {
482 struct tty_struct *tty = port->info->tty;
483 int i, count, copied = 0;
484 unsigned short status;
485
486 status = sci_in(port, SCxSR);
487 if (!(status & SCxSR_RDxF(port)))
488 return;
489
490 while (1) {
491 #if !defined(SCI_ONLY)
492 if (port->type == PORT_SCIF) {
493 count = sci_in(port, SCFDR)&SCIF_RFDC_MASK ;
494 } else {
495 count = (sci_in(port, SCxSR)&SCxSR_RDxF(port))?1:0;
496 }
497 #else
498 count = (sci_in(port, SCxSR)&SCxSR_RDxF(port))?1:0;
499 #endif
500
501 /* Don't copy more bytes than there is room for in the buffer */
502 if (tty->flip.count + count > TTY_FLIPBUF_SIZE)
503 count = TTY_FLIPBUF_SIZE - tty->flip.count;
504
505 /* If for any reason we can't copy more data, we're done! */
506 if (count == 0)
507 break;
508
509 if (port->type == PORT_SCI) {
510 char c = sci_in(port, SCxRDR);
511 if(((struct sci_port *)port)->break_flag
512 || uart_handle_sysrq_char(port, c, regs)) {
513 count = 0;
514 } else {
515 tty->flip.char_buf_ptr[0] = c;
516 tty->flip.flag_buf_ptr[0] = TTY_NORMAL;
517 }
518 } else {
519 for (i=0; i<count; i++) {
520 char c = sci_in(port, SCxRDR);
521 status = sci_in(port, SCxSR);
522 #if defined(CONFIG_CPU_SH3)
523 /* Skip "chars" during break */
524 if (((struct sci_port *)port)->break_flag) {
525 if ((c == 0) &&
526 (status & SCxSR_FER(port))) {
527 count--; i--;
528 continue;
529 }
530 /* Nonzero => end-of-break */
531 pr_debug("scif: debounce<%02x>\n", c);
532 ((struct sci_port *)port)->break_flag = 0;
533 if (STEPFN(c)) {
534 count--; i--;
535 continue;
536 }
537 }
538 #endif /* CONFIG_CPU_SH3 */
539 if (uart_handle_sysrq_char(port, c, regs)) {
540 count--; i--;
541 continue;
542 }
543
544 /* Store data and status */
545 tty->flip.char_buf_ptr[i] = c;
546 if (status&SCxSR_FER(port)) {
547 tty->flip.flag_buf_ptr[i] = TTY_FRAME;
548 pr_debug("sci: frame error\n");
549 } else if (status&SCxSR_PER(port)) {
550 tty->flip.flag_buf_ptr[i] = TTY_PARITY;
551 pr_debug("sci: parity error\n");
552 } else {
553 tty->flip.flag_buf_ptr[i] = TTY_NORMAL;
554 }
555 }
556 }
557
558 sci_in(port, SCxSR); /* dummy read */
559 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
560
561 /* Update the kernel buffer end */
562 tty->flip.count += count;
563 tty->flip.char_buf_ptr += count;
564 tty->flip.flag_buf_ptr += count;
565 copied += count;
566 port->icount.rx += count;
567 }
568
569 if (copied) {
570 /* Tell the rest of the system the news. New characters! */
571 tty_flip_buffer_push(tty);
572 } else {
573 sci_in(port, SCxSR); /* dummy read */
574 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
575 }
576 }
577
578 #define SCI_BREAK_JIFFIES (HZ/20)
579 /* The sci generates interrupts during the break,
580 * 1 per millisecond or so during the break period, for 9600 baud.
581 * So dont bother disabling interrupts.
582 * But dont want more than 1 break event.
583 * Use a kernel timer to periodically poll the rx line until
584 * the break is finished.
585 */
586 static void sci_schedule_break_timer(struct sci_port *port)
587 {
588 port->break_timer.expires = jiffies + SCI_BREAK_JIFFIES;
589 add_timer(&port->break_timer);
590 }
591 /* Ensure that two consecutive samples find the break over. */
592 static void sci_break_timer(unsigned long data)
593 {
594 struct sci_port * port = (struct sci_port *)data;
595 if(sci_rxd_in(&port->port) == 0) {
596 port->break_flag = 1;
597 sci_schedule_break_timer(port);
598 } else if(port->break_flag == 1){
599 /* break is over. */
600 port->break_flag = 2;
601 sci_schedule_break_timer(port);
602 } else port->break_flag = 0;
603 }
604
605 static inline int sci_handle_errors(struct uart_port *port)
606 {
607 int copied = 0;
608 unsigned short status = sci_in(port, SCxSR);
609 struct tty_struct *tty = port->info->tty;
610
611 if (status&SCxSR_ORER(port) && tty->flip.count<TTY_FLIPBUF_SIZE) {
612 /* overrun error */
613 copied++;
614 *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
615 pr_debug("sci: overrun error\n");
616 }
617
618 if (status&SCxSR_FER(port) && tty->flip.count<TTY_FLIPBUF_SIZE) {
619 if (sci_rxd_in(port) == 0) {
620 /* Notify of BREAK */
621 struct sci_port * sci_port = (struct sci_port *)port;
622 if(!sci_port->break_flag) {
623 sci_port->break_flag = 1;
624 sci_schedule_break_timer((struct sci_port *)port);
625 /* Do sysrq handling. */
626 if(uart_handle_break(port)) {
627 return 0;
628 }
629 pr_debug("sci: BREAK detected\n");
630 copied++;
631 *tty->flip.flag_buf_ptr++ = TTY_BREAK;
632 }
633 }
634 else {
635 /* frame error */
636 copied++;
637 *tty->flip.flag_buf_ptr++ = TTY_FRAME;
638 pr_debug("sci: frame error\n");
639 }
640 }
641
642 if (status&SCxSR_PER(port) && tty->flip.count<TTY_FLIPBUF_SIZE) {
643 /* parity error */
644 copied++;
645 *tty->flip.flag_buf_ptr++ = TTY_PARITY;
646 pr_debug("sci: parity error\n");
647 }
648
649 if (copied) {
650 tty->flip.count += copied;
651 tty_flip_buffer_push(tty);
652 }
653
654 return copied;
655 }
656
657 static inline int sci_handle_breaks(struct uart_port *port)
658 {
659 int copied = 0;
660 unsigned short status = sci_in(port, SCxSR);
661 struct tty_struct *tty = port->info->tty;
662 struct sci_port *s = &sci_ports[port->line];
663
664 if (!s->break_flag && status & SCxSR_BRK(port) &&
665 tty->flip.count < TTY_FLIPBUF_SIZE) {
666 #if defined(CONFIG_CPU_SH3)
667 /* Debounce break */
668 s->break_flag = 1;
669 #endif
670 /* Notify of BREAK */
671 copied++;
672 *tty->flip.flag_buf_ptr++ = TTY_BREAK;
673 pr_debug("sci: BREAK detected\n");
674 }
675
676 #if defined(SCIF_ORER)
677 /* XXX: Handle SCIF overrun error */
678 if (port->type == PORT_SCIF && (sci_in(port, SCLSR) & SCIF_ORER) != 0) {
679 sci_out(port, SCLSR, 0);
680 if(tty->flip.count<TTY_FLIPBUF_SIZE) {
681 copied++;
682 *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
683 pr_debug("sci: overrun error\n");
684 }
685 }
686 #endif
687
688 if (copied) {
689 tty->flip.count += copied;
690 tty_flip_buffer_push(tty);
691 }
692
693 return copied;
694 }
695
696 static irqreturn_t sci_rx_interrupt(int irq, void *ptr, struct pt_regs *regs)
697 {
698 struct uart_port *port = ptr;
699
700 /* I think sci_receive_chars has to be called irrespective
701 * of whether the I_IXOFF is set, otherwise, how is the interrupt
702 * to be disabled?
703 */
704 sci_receive_chars(port, regs);
705
706 return IRQ_HANDLED;
707 }
708
709 static irqreturn_t sci_tx_interrupt(int irq, void *ptr, struct pt_regs *regs)
710 {
711 struct uart_port *port = ptr;
712
713 sci_transmit_chars(port);
714
715 return IRQ_HANDLED;
716 }
717
718 static irqreturn_t sci_er_interrupt(int irq, void *ptr, struct pt_regs *regs)
719 {
720 struct uart_port *port = ptr;
721
722 /* Handle errors */
723 if (port->type == PORT_SCI) {
724 if (sci_handle_errors(port)) {
725 /* discard character in rx buffer */
726 sci_in(port, SCxSR);
727 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
728 }
729 } else {
730 #if defined(SCIF_ORER)
731 if((sci_in(port, SCLSR) & SCIF_ORER) != 0) {
732 struct tty_struct *tty = port->info->tty;
733
734 sci_out(port, SCLSR, 0);
735 if(tty->flip.count<TTY_FLIPBUF_SIZE) {
736 *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
737 tty->flip.count++;
738 tty_flip_buffer_push(tty);
739 pr_debug("scif: overrun error\n");
740 }
741 }
742 #endif
743 sci_rx_interrupt(irq, ptr, regs);
744 }
745
746 sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
747
748 /* Kick the transmission */
749 sci_tx_interrupt(irq, ptr, regs);
750
751 return IRQ_HANDLED;
752 }
753
754 static irqreturn_t sci_br_interrupt(int irq, void *ptr, struct pt_regs *regs)
755 {
756 struct uart_port *port = ptr;
757
758 /* Handle BREAKs */
759 sci_handle_breaks(port);
760 sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port));
761
762 return IRQ_HANDLED;
763 }
764
765 static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr, struct pt_regs *regs)
766 {
767 unsigned short ssr_status, scr_status;
768 struct uart_port *port = ptr;
769
770 ssr_status = sci_in(port,SCxSR);
771 scr_status = sci_in(port,SCSCR);
772
773 /* Tx Interrupt */
774 if ((ssr_status&0x0020) && (scr_status&0x0080))
775 sci_tx_interrupt(irq, ptr, regs);
776 /* Rx Interrupt */
777 if ((ssr_status&0x0002) && (scr_status&0x0040))
778 sci_rx_interrupt(irq, ptr, regs);
779 /* Error Interrupt */
780 if ((ssr_status&0x0080) && (scr_status&0x0400))
781 sci_er_interrupt(irq, ptr, regs);
782 /* Break Interrupt */
783 if ((ssr_status&0x0010) && (scr_status&0x0200))
784 sci_br_interrupt(irq, ptr, regs);
785
786 return IRQ_HANDLED;
787 }
788
789 #ifdef CONFIG_CPU_FREQ
790 /*
791 * Here we define a transistion notifier so that we can update all of our
792 * ports' baud rate when the peripheral clock changes.
793 */
794 static int sci_notifier(struct notifier_block *self, unsigned long phase, void *p)
795 {
796 struct cpufreq_freqs *freqs = p;
797 int i;
798
799 if ((phase == CPUFREQ_POSTCHANGE) ||
800 (phase == CPUFREQ_RESUMECHANGE)){
801 for (i = 0; i < SCI_NPORTS; i++) {
802 struct uart_port *port = &sci_ports[i].port;
803
804 /*
805 * Update the uartclk per-port if frequency has
806 * changed, since it will no longer necessarily be
807 * consistent with the old frequency.
808 *
809 * Really we want to be able to do something like
810 * uart_change_speed() or something along those lines
811 * here to implicitly reset the per-port baud rate..
812 *
813 * Clean this up later..
814 */
815 port->uartclk = current_cpu_data.module_clock * 16;
816 }
817
818 printk("%s: got a postchange notification for cpu %d (old %d, new %d)\n",
819 __FUNCTION__, freqs->cpu, freqs->old, freqs->new);
820 }
821
822 return NOTIFY_OK;
823 }
824
825 static struct notifier_block sci_nb = { &sci_notifier, NULL, 0 };
826 #endif /* CONFIG_CPU_FREQ */
827
828 static int sci_request_irq(struct sci_port *port)
829 {
830 int i;
831 irqreturn_t (*handlers[4])(int irq, void *ptr, struct pt_regs *regs) = {
832 sci_er_interrupt, sci_rx_interrupt, sci_tx_interrupt,
833 sci_br_interrupt,
834 };
835 const char *desc[] = { "SCI Receive Error", "SCI Receive Data Full",
836 "SCI Transmit Data Empty", "SCI Break" };
837
838 if (port->irqs[0] == port->irqs[1]) {
839 if (!port->irqs[0]) {
840 printk(KERN_ERR "sci: Cannot allocate irq.(IRQ=0)\n");
841 return -ENODEV;
842 }
843 if (request_irq(port->irqs[0], sci_mpxed_interrupt, SA_INTERRUPT,
844 "sci", port)) {
845 printk(KERN_ERR "sci: Cannot allocate irq.\n");
846 return -ENODEV;
847 }
848 } else {
849 for (i = 0; i < ARRAY_SIZE(handlers); i++) {
850 if (!port->irqs[i])
851 continue;
852 if (request_irq(port->irqs[i], handlers[i], SA_INTERRUPT,
853 desc[i], port)) {
854 printk(KERN_ERR "sci: Cannot allocate irq.\n");
855 return -ENODEV;
856 }
857 }
858 }
859
860 return 0;
861 }
862
863 static void sci_free_irq(struct sci_port *port)
864 {
865 int i;
866
867 if (port->irqs[0] == port->irqs[1]) {
868 if (!port->irqs[0])
869 printk("sci: sci_free_irq error\n");
870 else
871 free_irq(port->irqs[0], port);
872 } else {
873 for (i = 0; i < ARRAY_SIZE(port->irqs); i++) {
874 if (!port->irqs[i])
875 continue;
876
877 free_irq(port->irqs[i], port);
878 }
879 }
880 }
881
882 static unsigned int sci_tx_empty(struct uart_port *port)
883 {
884 /* Can't detect */
885 return TIOCSER_TEMT;
886 }
887
888 static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl)
889 {
890 /* This routine is used for seting signals of: DTR, DCD, CTS/RTS */
891 /* We use SCIF's hardware for CTS/RTS, so don't need any for that. */
892 /* If you have signals for DTR and DCD, please implement here. */
893 }
894
895 static unsigned int sci_get_mctrl(struct uart_port *port)
896 {
897 /* This routine is used for geting signals of: DTR, DCD, DSR, RI,
898 and CTS/RTS */
899
900 return TIOCM_DTR | TIOCM_RTS | TIOCM_DSR;
901 }
902
903 static void sci_start_tx(struct uart_port *port, unsigned int tty_start)
904 {
905 struct sci_port *s = &sci_ports[port->line];
906
907 disable_irq(s->irqs[SCIx_TXI_IRQ]);
908 sci_transmit_chars(port);
909 enable_irq(s->irqs[SCIx_TXI_IRQ]);
910 }
911
912 static void sci_stop_tx(struct uart_port *port, unsigned int tty_stop)
913 {
914 unsigned long flags;
915 unsigned short ctrl;
916
917 /* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */
918 local_irq_save(flags);
919 ctrl = sci_in(port, SCSCR);
920 ctrl &= ~SCI_CTRL_FLAGS_TIE;
921 sci_out(port, SCSCR, ctrl);
922 local_irq_restore(flags);
923 }
924
925 static void sci_start_rx(struct uart_port *port, unsigned int tty_start)
926 {
927 unsigned long flags;
928 unsigned short ctrl;
929
930 /* Set RIE (Receive Interrupt Enable) bit in SCSCR */
931 local_irq_save(flags);
932 ctrl = sci_in(port, SCSCR);
933 ctrl |= SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE;
934 sci_out(port, SCSCR, ctrl);
935 local_irq_restore(flags);
936 }
937
938 static void sci_stop_rx(struct uart_port *port)
939 {
940 unsigned long flags;
941 unsigned short ctrl;
942
943 /* Clear RIE (Receive Interrupt Enable) bit in SCSCR */
944 local_irq_save(flags);
945 ctrl = sci_in(port, SCSCR);
946 ctrl &= ~(SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE);
947 sci_out(port, SCSCR, ctrl);
948 local_irq_restore(flags);
949 }
950
951 static void sci_enable_ms(struct uart_port *port)
952 {
953 /* Nothing here yet .. */
954 }
955
956 static void sci_break_ctl(struct uart_port *port, int break_state)
957 {
958 /* Nothing here yet .. */
959 }
960
961 static int sci_startup(struct uart_port *port)
962 {
963 struct sci_port *s = &sci_ports[port->line];
964
965 #if defined(__H8300S__)
966 h8300_sci_enable(port, sci_enable);
967 #endif
968
969 sci_request_irq(s);
970 sci_start_tx(port, 1);
971 sci_start_rx(port, 1);
972
973 return 0;
974 }
975
976 static void sci_shutdown(struct uart_port *port)
977 {
978 struct sci_port *s = &sci_ports[port->line];
979
980 sci_stop_rx(port);
981 sci_stop_tx(port, 1);
982 sci_free_irq(s);
983
984 #if defined(__H8300S__)
985 h8300_sci_enable(port, sci_disable);
986 #endif
987 }
988
989 static void sci_set_termios(struct uart_port *port, struct termios *termios,
990 struct termios *old)
991 {
992 struct sci_port *s = &sci_ports[port->line];
993 unsigned int status, baud, smr_val;
994 unsigned long flags;
995 int t;
996
997 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
998
999 spin_lock_irqsave(&port->lock, flags);
1000
1001 do {
1002 status = sci_in(port, SCxSR);
1003 } while (!(status & SCxSR_TEND(port)));
1004
1005 sci_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */
1006
1007 #if !defined(SCI_ONLY)
1008 if (port->type == PORT_SCIF) {
1009 sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
1010 }
1011 #endif
1012
1013 smr_val = sci_in(port, SCSMR) & 3;
1014 if ((termios->c_cflag & CSIZE) == CS7)
1015 smr_val |= 0x40;
1016 if (termios->c_cflag & PARENB)
1017 smr_val |= 0x20;
1018 if (termios->c_cflag & PARODD)
1019 smr_val |= 0x30;
1020 if (termios->c_cflag & CSTOPB)
1021 smr_val |= 0x08;
1022
1023 uart_update_timeout(port, termios->c_cflag, baud);
1024
1025 sci_out(port, SCSMR, smr_val);
1026
1027 switch (baud) {
1028 case 0: t = -1; break;
1029 case 2400: t = BPS_2400; break;
1030 case 4800: t = BPS_4800; break;
1031 case 9600: t = BPS_9600; break;
1032 case 19200: t = BPS_19200; break;
1033 case 38400: t = BPS_38400; break;
1034 case 57600: t = BPS_57600; break;
1035 case 115200: t = BPS_115200; break;
1036 default: t = SCBRR_VALUE(baud); break;
1037 }
1038
1039 if (t > 0) {
1040 if(t >= 256) {
1041 sci_out(port, SCSMR, (sci_in(port, SCSMR) & ~3) | 1);
1042 t >>= 2;
1043 } else {
1044 sci_out(port, SCSMR, sci_in(port, SCSMR) & ~3);
1045 }
1046 sci_out(port, SCBRR, t);
1047 udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
1048 }
1049
1050 s->init_pins(port, termios->c_cflag);
1051 sci_out(port, SCSCR, SCSCR_INIT(port));
1052
1053 if ((termios->c_cflag & CREAD) != 0)
1054 sci_start_rx(port,0);
1055
1056 spin_unlock_irqrestore(&port->lock, flags);
1057 }
1058
1059 static const char *sci_type(struct uart_port *port)
1060 {
1061 switch (port->type) {
1062 case PORT_SCI: return "sci";
1063 case PORT_SCIF: return "scif";
1064 case PORT_IRDA: return "irda";
1065 }
1066
1067 return 0;
1068 }
1069
1070 static void sci_release_port(struct uart_port *port)
1071 {
1072 /* Nothing here yet .. */
1073 }
1074
1075 static int sci_request_port(struct uart_port *port)
1076 {
1077 /* Nothing here yet .. */
1078 return 0;
1079 }
1080
1081 static void sci_config_port(struct uart_port *port, int flags)
1082 {
1083 struct sci_port *s = &sci_ports[port->line];
1084
1085 port->type = s->type;
1086
1087 #if defined(CONFIG_CPU_SUBTYPE_SH5_101) || defined(CONFIG_CPU_SUBTYPE_SH5_103)
1088 if (port->mapbase == 0)
1089 port->mapbase = onchip_remap(SCIF_ADDR_SH5, 1024, "SCIF");
1090
1091 port->membase = (void *)port->mapbase;
1092 #endif
1093 }
1094
1095 static int sci_verify_port(struct uart_port *port, struct serial_struct *ser)
1096 {
1097 struct sci_port *s = &sci_ports[port->line];
1098
1099 if (ser->irq != s->irqs[SCIx_TXI_IRQ] || ser->irq > NR_IRQS)
1100 return -EINVAL;
1101 if (ser->baud_base < 2400)
1102 /* No paper tape reader for Mitch.. */
1103 return -EINVAL;
1104
1105 return 0;
1106 }
1107
1108 static struct uart_ops sci_uart_ops = {
1109 .tx_empty = sci_tx_empty,
1110 .set_mctrl = sci_set_mctrl,
1111 .get_mctrl = sci_get_mctrl,
1112 .start_tx = sci_start_tx,
1113 .stop_tx = sci_stop_tx,
1114 .stop_rx = sci_stop_rx,
1115 .enable_ms = sci_enable_ms,
1116 .break_ctl = sci_break_ctl,
1117 .startup = sci_startup,
1118 .shutdown = sci_shutdown,
1119 .set_termios = sci_set_termios,
1120 .type = sci_type,
1121 .release_port = sci_release_port,
1122 .request_port = sci_request_port,
1123 .config_port = sci_config_port,
1124 .verify_port = sci_verify_port,
1125 };
1126
1127 static struct sci_port sci_ports[SCI_NPORTS] = {
1128 #if defined(CONFIG_CPU_SUBTYPE_SH7708)
1129 {
1130 .port = {
1131 .membase = (void *)0xfffffe80,
1132 .mapbase = 0xfffffe80,
1133 .iotype = SERIAL_IO_MEM,
1134 .irq = 25,
1135 .ops = &sci_uart_ops,
1136 .flags = ASYNC_BOOT_AUTOCONF,
1137 .line = 0,
1138 },
1139 .type = PORT_SCI,
1140 .irqs = SCI_IRQS,
1141 .init_pins = sci_init_pins_sci,
1142 },
1143 #elif defined(CONFIG_CPU_SUBTYPE_SH7705)
1144 {
1145 .port = {
1146 .membase = (void *)SCIF0,
1147 .mapbase = SCIF0,
1148 .iotype = SERIAL_IO_MEM,
1149 .irq = 55,
1150 .ops = &sci_uart_ops,
1151 .flags = ASYNC_BOOT_AUTOCONF,
1152 .line = 0,
1153 },
1154 .type = PORT_SCIF,
1155 .irqs = SH3_IRDA_IRQS,
1156 .init_pins = sci_init_pins_scif,
1157 },
1158 {
1159 .port = {
1160 .membase = (void *)SCIF2,
1161 .mapbase = SCIF2,
1162 .iotype = SERIAL_IO_MEM,
1163 .irq = 59,
1164 .ops = &sci_uart_ops,
1165 .flags = ASYNC_BOOT_AUTOCONF,
1166 .line = 1,
1167 },
1168 .type = PORT_SCIF,
1169 .irqs = SH3_SCIF_IRQS,
1170 .init_pins = sci_init_pins_scif,
1171 }
1172 #elif defined(CONFIG_CPU_SUBTYPE_SH7707) || defined(CONFIG_CPU_SUBTYPE_SH7709)
1173 {
1174 .port = {
1175 .membase = (void *)0xfffffe80,
1176 .mapbase = 0xfffffe80,
1177 .iotype = SERIAL_IO_MEM,
1178 .irq = 25,
1179 .ops = &sci_uart_ops,
1180 .flags = ASYNC_BOOT_AUTOCONF,
1181 .line = 0,
1182 },
1183 .type = PORT_SCI,
1184 .irqs = SCI_IRQS,
1185 .init_pins = sci_init_pins_sci,
1186 },
1187 {
1188 .port = {
1189 .membase = (void *)0xa4000150,
1190 .mapbase = 0xa4000150,
1191 .iotype = SERIAL_IO_MEM,
1192 .irq = 59,
1193 .ops = &sci_uart_ops,
1194 .flags = ASYNC_BOOT_AUTOCONF,
1195 .line = 1,
1196 },
1197 .type = PORT_SCIF,
1198 .irqs = SH3_SCIF_IRQS,
1199 .init_pins = sci_init_pins_scif,
1200 },
1201 {
1202 .port = {
1203 .membase = (void *)0xa4000140,
1204 .mapbase = 0xa4000140,
1205 .iotype = SERIAL_IO_MEM,
1206 .irq = 55,
1207 .ops = &sci_uart_ops,
1208 .flags = ASYNC_BOOT_AUTOCONF,
1209 .line = 2,
1210 },
1211 .type = PORT_IRDA,
1212 .irqs = SH3_IRDA_IRQS,
1213 .init_pins = sci_init_pins_irda,
1214 }
1215 #elif defined(CONFIG_CPU_SUBTYPE_SH7300)
1216 {
1217 .port = {
1218 .membase = (void *)0xA4430000,
1219 .mapbase = 0xA4430000,
1220 .iotype = SERIAL_IO_MEM,
1221 .irq = 25,
1222 .ops = &sci_uart_ops,
1223 .flags = ASYNC_BOOT_AUTOCONF,
1224 .line = 0,
1225 },
1226 .type = PORT_SCIF,
1227 .irqs = SH7300_SCIF0_IRQS,
1228 .init_pins = sci_init_pins_scif,
1229 },
1230 #elif defined(CONFIG_CPU_SUBTYPE_SH73180)
1231 {
1232 .port = {
1233 .membase = (void *)0xffe00000,
1234 .mapbase = 0xffe00000,
1235 .iotype = SERIAL_IO_MEM,
1236 .irq = 25,
1237 .ops = &sci_uart_ops,
1238 .flags = ASYNC_BOOT_AUTOCONF,
1239 .line = 0,
1240 },
1241 .type = PORT_SCIF,
1242 .irqs = SH73180_SCIF_IRQS,
1243 .init_pins = sci_init_pins_scif,
1244 },
1245 #elif defined(CONFIG_SH_RTS7751R2D)
1246 {
1247 .port = {
1248 .membase = (void *)0xffe80000,
1249 .mapbase = 0xffe80000,
1250 .iotype = SERIAL_IO_MEM,
1251 .irq = 43,
1252 .ops = &sci_uart_ops,
1253 .flags = ASYNC_BOOT_AUTOCONF,
1254 .line = 0,
1255 },
1256 .type = PORT_SCIF,
1257 .irqs = SH4_SCIF_IRQS,
1258 .init_pins = sci_init_pins_scif,
1259 },
1260 #elif defined(CONFIG_CPU_SUBTYPE_SH7750) || defined(CONFIG_CPU_SUBTYPE_SH7751)
1261 {
1262 .port = {
1263 .membase = (void *)0xffe00000,
1264 .mapbase = 0xffe00000,
1265 .iotype = SERIAL_IO_MEM,
1266 .irq = 25,
1267 .ops = &sci_uart_ops,
1268 .flags = ASYNC_BOOT_AUTOCONF,
1269 .line = 0,
1270 },
1271 .type = PORT_SCI,
1272 .irqs = SCI_IRQS,
1273 .init_pins = sci_init_pins_sci,
1274 },
1275 {
1276 .port = {
1277 .membase = (void *)0xffe80000,
1278 .mapbase = 0xffe80000,
1279 .iotype = SERIAL_IO_MEM,
1280 .irq = 43,
1281 .ops = &sci_uart_ops,
1282 .flags = ASYNC_BOOT_AUTOCONF,
1283 .line = 1,
1284 },
1285 .type = PORT_SCIF,
1286 .irqs = SH4_SCIF_IRQS,
1287 .init_pins = sci_init_pins_scif,
1288 },
1289 #elif defined(CONFIG_CPU_SUBTYPE_SH7760)
1290 {
1291 .port = {
1292 .membase = (void *)0xfe600000,
1293 .mapbase = 0xfe600000,
1294 .iotype = SERIAL_IO_MEM,
1295 .irq = 55,
1296 .ops = &sci_uart_ops,
1297 .flags = ASYNC_BOOT_AUTOCONF,
1298 .line = 0,
1299 },
1300 .type = PORT_SCIF,
1301 .irqs = SH7760_SCIF0_IRQS,
1302 .init_pins = sci_init_pins_scif,
1303 },
1304 {
1305 .port = {
1306 .membase = (void *)0xfe610000,
1307 .mapbase = 0xfe610000,
1308 .iotype = SERIAL_IO_MEM,
1309 .irq = 75,
1310 .ops = &sci_uart_ops,
1311 .flags = ASYNC_BOOT_AUTOCONF,
1312 .line = 1,
1313 },
1314 .type = PORT_SCIF,
1315 .irqs = SH7760_SCIF1_IRQS,
1316 .init_pins = sci_init_pins_scif,
1317 },
1318 {
1319 .port = {
1320 .membase = (void *)0xfe620000,
1321 .mapbase = 0xfe620000,
1322 .iotype = SERIAL_IO_MEM,
1323 .irq = 79,
1324 .ops = &sci_uart_ops,
1325 .flags = ASYNC_BOOT_AUTOCONF,
1326 .line = 2,
1327 },
1328 .type = PORT_SCIF,
1329 .irqs = SH7760_SCIF2_IRQS,
1330 .init_pins = sci_init_pins_scif,
1331 },
1332 #elif defined(CONFIG_CPU_SUBTYPE_SH4_202)
1333 {
1334 .port = {
1335 .membase = (void *)0xffe80000,
1336 .mapbase = 0xffe80000,
1337 .iotype = SERIAL_IO_MEM,
1338 .irq = 43,
1339 .ops = &sci_uart_ops,
1340 .flags = ASYNC_BOOT_AUTOCONF,
1341 .line = 0,
1342 },
1343 .type = PORT_SCIF,
1344 .irqs = SH4_SCIF_IRQS,
1345 .init_pins = sci_init_pins_scif,
1346 },
1347 #elif defined(CONFIG_CPU_SUBTYPE_ST40STB1)
1348 {
1349 .port = {
1350 .membase = (void *)0xffe00000,
1351 .mapbase = 0xffe00000,
1352 .iotype = SERIAL_IO_MEM,
1353 .irq = 26,
1354 .ops = &sci_uart_ops,
1355 .flags = ASYNC_BOOT_AUTOCONF,
1356 .line = 0,
1357 },
1358 .type = PORT_SCIF,
1359 .irqs = STB1_SCIF1_IRQS,
1360 .init_pins = sci_init_pins_scif,
1361 },
1362 {
1363 .port = {
1364 .membase = (void *)0xffe80000,
1365 .mapbase = 0xffe80000,
1366 .iotype = SERIAL_IO_MEM,
1367 .irq = 43,
1368 .ops = &sci_uart_ops,
1369 .flags = ASYNC_BOOT_AUTOCONF,
1370 .line = 1,
1371 },
1372 .type = PORT_SCIF,
1373 .irqs = SH4_SCIF_IRQS,
1374 .init_pins = sci_init_pins_scif,
1375 },
1376 #elif defined(CONFIG_CPU_SUBTYPE_SH5_101) || defined(CONFIG_CPU_SUBTYPE_SH5_103)
1377 {
1378 .port = {
1379 .iotype = SERIAL_IO_MEM,
1380 .irq = 42,
1381 .ops = &sci_uart_ops,
1382 .flags = ASYNC_BOOT_AUTOCONF,
1383 .line = 0,
1384 },
1385 .type = PORT_SCIF,
1386 .irqs = SH5_SCIF_IRQS,
1387 .init_pins = sci_init_pins_scif,
1388 },
1389 #elif defined(CONFIG_H83007) || defined(CONFIG_H83068)
1390 {
1391 .port = {
1392 .membase = (void *)0x00ffffb0,
1393 .mapbase = 0x00ffffb0,
1394 .iotype = SERIAL_IO_MEM,
1395 .irq = 54,
1396 .ops = &sci_uart_ops,
1397 .flags = ASYNC_BOOT_AUTOCONF,
1398 .line = 0,
1399 },
1400 .type = PORT_SCI,
1401 .irqs = H8300H_SCI_IRQS0,
1402 .init_pins = sci_init_pins_sci,
1403 },
1404 {
1405 .port = {
1406 .membase = (void *)0x00ffffb8,
1407 .mapbase = 0x00ffffb8,
1408 .iotype = SERIAL_IO_MEM,
1409 .irq = 58,
1410 .ops = &sci_uart_ops,
1411 .flags = ASYNC_BOOT_AUTOCONF,
1412 .line = 1,
1413 },
1414 .type = PORT_SCI,
1415 .irqs = H8300H_SCI_IRQS1,
1416 .init_pins = sci_init_pins_sci,
1417 },
1418 {
1419 .port = {
1420 .membase = (void *)0x00ffffc0,
1421 .mapbase = 0x00ffffc0,
1422 .iotype = SERIAL_IO_MEM,
1423 .irq = 62,
1424 .ops = &sci_uart_ops,
1425 .flags = ASYNC_BOOT_AUTOCONF,
1426 .line = 2,
1427 },
1428 .type = PORT_SCI,
1429 .irqs = H8300H_SCI_IRQS2,
1430 .init_pins = sci_init_pins_sci,
1431 },
1432 #elif defined(CONFIG_H8S2678)
1433 {
1434 .port = {
1435 .membase = (void *)0x00ffff78,
1436 .mapbase = 0x00ffff78,
1437 .iotype = SERIAL_IO_MEM,
1438 .irq = 90,
1439 .ops = &sci_uart_ops,
1440 .flags = ASYNC_BOOT_AUTOCONF,
1441 .line = 0,
1442 },
1443 .type = PORT_SCI,
1444 .irqs = H8S_SCI_IRQS0,
1445 .init_pins = sci_init_pins_sci,
1446 },
1447 {
1448 .port = {
1449 .membase = (void *)0x00ffff80,
1450 .mapbase = 0x00ffff80,
1451 .iotype = SERIAL_IO_MEM,
1452 .irq = 94,
1453 .ops = &sci_uart_ops,
1454 .flags = ASYNC_BOOT_AUTOCONF,
1455 .line = 1,
1456 },
1457 .type = PORT_SCI,
1458 .irqs = H8S_SCI_IRQS1,
1459 .init_pins = sci_init_pins_sci,
1460 },
1461 {
1462 .port = {
1463 .membase = (void *)0x00ffff88,
1464 .mapbase = 0x00ffff88,
1465 .iotype = SERIAL_IO_MEM,
1466 .irq = 98,
1467 .ops = &sci_uart_ops,
1468 .flags = ASYNC_BOOT_AUTOCONF,
1469 .line = 2,
1470 },
1471 .type = PORT_SCI,
1472 .irqs = H8S_SCI_IRQS2,
1473 .init_pins = sci_init_pins_sci,
1474 },
1475 #else
1476 #error "CPU subtype not defined"
1477 #endif
1478 };
1479
1480 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
1481 /*
1482 * Print a string to the serial port trying not to disturb
1483 * any possible real use of the port...
1484 */
1485 static void serial_console_write(struct console *co, const char *s,
1486 unsigned count)
1487 {
1488 put_string(serial_console_port, s, count);
1489 }
1490
1491 static int __init serial_console_setup(struct console *co, char *options)
1492 {
1493 struct uart_port *port;
1494 int baud = 115200;
1495 int bits = 8;
1496 int parity = 'n';
1497 int flow = 'n';
1498 int ret;
1499
1500 if (co->index >= SCI_NPORTS)
1501 co->index = 0;
1502
1503 serial_console_port = &sci_ports[co->index];
1504 port = &serial_console_port->port;
1505 port->type = serial_console_port->type;
1506
1507 #ifdef CONFIG_SUPERH64
1508 /* This is especially needed on sh64 to remap the SCIF */
1509 sci_config_port(port, 0);
1510 #endif
1511
1512 /*
1513 * We need to set the initial uartclk here, since otherwise it will
1514 * only ever be setup at sci_init() time.
1515 */
1516 #if !defined(__H8300H__) && !defined(__H8300S__)
1517 port->uartclk = current_cpu_data.module_clock * 16;
1518 #else
1519 port->uartclk = CONFIG_CPU_CLOCK;
1520 #endif
1521 #if defined(__H8300S__)
1522 h8300_sci_enable(port, sci_enable);
1523 #endif
1524 if (options)
1525 uart_parse_options(options, &baud, &parity, &bits, &flow);
1526
1527 ret = uart_set_options(port, co, baud, parity, bits, flow);
1528 #if defined(__H8300H__) || defined(__H8300S__)
1529 /* disable rx interrupt */
1530 if (ret == 0)
1531 sci_stop_rx(port);
1532 #endif
1533 return ret;
1534 }
1535
1536 static struct console serial_console = {
1537 .name = "ttySC",
1538 .device = uart_console_device,
1539 .write = serial_console_write,
1540 .setup = serial_console_setup,
1541 .flags = CON_PRINTBUFFER,
1542 .index = -1,
1543 .data = &sci_uart_driver,
1544 };
1545
1546 static int __init sci_console_init(void)
1547 {
1548 register_console(&serial_console);
1549 return 0;
1550 }
1551
1552 console_initcall(sci_console_init);
1553 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
1554
1555 #ifdef CONFIG_SH_KGDB
1556 /*
1557 * FIXME: Most of this can go away.. at the moment, we rely on
1558 * arch/sh/kernel/setup.c to do the command line parsing for kgdb, though
1559 * most of that can easily be done here instead.
1560 *
1561 * For the time being, just accept the values that were parsed earlier..
1562 */
1563 static void __init kgdb_console_get_options(struct uart_port *port, int *baud,
1564 int *parity, int *bits)
1565 {
1566 *baud = kgdb_baud;
1567 *parity = tolower(kgdb_parity);
1568 *bits = kgdb_bits - '0';
1569 }
1570
1571 /*
1572 * The naming here is somewhat misleading, since kgdb_console_setup() takes
1573 * care of the early-on initialization for kgdb, regardless of whether we
1574 * actually use kgdb as a console or not.
1575 *
1576 * On the plus side, this lets us kill off the old kgdb_sci_setup() nonsense.
1577 */
1578 int __init kgdb_console_setup(struct console *co, char *options)
1579 {
1580 struct uart_port *port = &sci_ports[kgdb_portnum].port;
1581 int baud = 38400;
1582 int bits = 8;
1583 int parity = 'n';
1584 int flow = 'n';
1585
1586 if (co->index >= SCI_NPORTS || co->index != kgdb_portnum)
1587 co->index = kgdb_portnum;
1588
1589 if (options)
1590 uart_parse_options(options, &baud, &parity, &bits, &flow);
1591 else
1592 kgdb_console_get_options(port, &baud, &parity, &bits);
1593
1594 kgdb_getchar = kgdb_sci_getchar;
1595 kgdb_putchar = kgdb_sci_putchar;
1596
1597 return uart_set_options(port, co, baud, parity, bits, flow);
1598 }
1599 #endif /* CONFIG_SH_KGDB */
1600
1601 #ifdef CONFIG_SH_KGDB_CONSOLE
1602 static struct console kgdb_console = {
1603 .name = "ttySC",
1604 .write = kgdb_console_write,
1605 .setup = kgdb_console_setup,
1606 .flags = CON_PRINTBUFFER | CON_ENABLED,
1607 .index = -1,
1608 .data = &sci_uart_driver,
1609 };
1610
1611 /* Register the KGDB console so we get messages (d'oh!) */
1612 static int __init kgdb_console_init(void)
1613 {
1614 register_console(&kgdb_console);
1615 return 0;
1616 }
1617
1618 console_initcall(kgdb_console_init);
1619 #endif /* CONFIG_SH_KGDB_CONSOLE */
1620
1621 #if defined(CONFIG_SH_KGDB_CONSOLE)
1622 #define SCI_CONSOLE &kgdb_console
1623 #elif defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
1624 #define SCI_CONSOLE &serial_console
1625 #else
1626 #define SCI_CONSOLE 0
1627 #endif
1628
1629 static char banner[] __initdata =
1630 KERN_INFO "SuperH SCI(F) driver initialized\n";
1631
1632 static struct uart_driver sci_uart_driver = {
1633 .owner = THIS_MODULE,
1634 .driver_name = "sci",
1635 #ifdef CONFIG_DEVFS_FS
1636 .devfs_name = "ttsc/",
1637 #endif
1638 .dev_name = "ttySC",
1639 .major = SCI_MAJOR,
1640 .minor = SCI_MINOR_START,
1641 .nr = SCI_NPORTS,
1642 .cons = SCI_CONSOLE,
1643 };
1644
1645 static int __init sci_init(void)
1646 {
1647 int chan, ret;
1648
1649 printk("%s", banner);
1650
1651 ret = uart_register_driver(&sci_uart_driver);
1652 if (ret == 0) {
1653 for (chan = 0; chan < SCI_NPORTS; chan++) {
1654 struct sci_port *sciport = &sci_ports[chan];
1655
1656 #if !defined(__H8300H__) && !defined(__H8300S__)
1657 sciport->port.uartclk = (current_cpu_data.module_clock * 16);
1658 #else
1659 sciport->port.uartclk = CONFIG_CPU_CLOCK;
1660 #endif
1661 uart_add_one_port(&sci_uart_driver, &sciport->port);
1662 sciport->break_timer.data = (unsigned long)sciport;
1663 sciport->break_timer.function = sci_break_timer;
1664 init_timer(&sciport->break_timer);
1665 }
1666 }
1667
1668 #ifdef CONFIG_CPU_FREQ
1669 cpufreq_register_notifier(&sci_nb, CPUFREQ_TRANSITION_NOTIFIER);
1670 printk("sci: CPU frequency notifier registered\n");
1671 #endif
1672
1673 #ifdef CONFIG_SH_STANDARD_BIOS
1674 sh_bios_gdb_detach();
1675 #endif
1676
1677 return ret;
1678 }
1679
1680 static void __exit sci_exit(void)
1681 {
1682 int chan;
1683
1684 for (chan = 0; chan < SCI_NPORTS; chan++)
1685 uart_remove_one_port(&sci_uart_driver, &sci_ports[chan].port);
1686
1687 uart_unregister_driver(&sci_uart_driver);
1688 }
1689
1690 module_init(sci_init);
1691 module_exit(sci_exit);
1692
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree