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V4L/DVB (8316): bt819: Fix a debug message
[linux-2.6/mini2440.git] / drivers / serial / sh-sci.c
blobce6ee92b3a1b32fa001dc79c3716ea797288d57b
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 - 2006 Paul Mundt
7 * Modified to support SH7720 SCIF. Markus Brunner, Mark Jonas (Jul 2007).
8 *
9 * based off of the old drivers/char/sh-sci.c by:
10 *
11 * Copyright (C) 1999, 2000 Niibe Yutaka
12 * Copyright (C) 2000 Sugioka Toshinobu
13 * Modified to support multiple serial ports. Stuart Menefy (May 2000).
14 * Modified to support SecureEdge. David McCullough (2002)
15 * Modified to support SH7300 SCIF. Takashi Kusuda (Jun 2003).
16 * Removed SH7300 support (Jul 2007).
17 *
18 * This file is subject to the terms and conditions of the GNU General Public
19 * License. See the file "COPYING" in the main directory of this archive
20 * for more details.
21 */
22 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
23 #define SUPPORT_SYSRQ
24 #endif
25
26 #undef DEBUG
27
28 #include <linux/module.h>
29 #include <linux/errno.h>
30 #include <linux/timer.h>
31 #include <linux/interrupt.h>
32 #include <linux/tty.h>
33 #include <linux/tty_flip.h>
34 #include <linux/serial.h>
35 #include <linux/major.h>
36 #include <linux/string.h>
37 #include <linux/sysrq.h>
38 #include <linux/ioport.h>
39 #include <linux/mm.h>
40 #include <linux/init.h>
41 #include <linux/delay.h>
42 #include <linux/console.h>
43 #include <linux/platform_device.h>
44 #include <linux/serial_sci.h>
45 #include <linux/notifier.h>
46 #include <linux/cpufreq.h>
47 #include <linux/clk.h>
48 #include <linux/ctype.h>
49
50 #ifdef CONFIG_SUPERH
51 #include <asm/clock.h>
52 #include <asm/sh_bios.h>
53 #include <asm/kgdb.h>
54 #endif
55
56 #include "sh-sci.h"
57
58 struct sci_port {
59 struct uart_port port;
60
61 /* Port type */
62 unsigned int type;
63
64 /* Port IRQs: ERI, RXI, TXI, BRI (optional) */
65 unsigned int irqs[SCIx_NR_IRQS];
66
67 /* Port pin configuration */
68 void (*init_pins)(struct uart_port *port,
69 unsigned int cflag);
70
71 /* Port enable callback */
72 void (*enable)(struct uart_port *port);
73
74 /* Port disable callback */
75 void (*disable)(struct uart_port *port);
76
77 /* Break timer */
78 struct timer_list break_timer;
79 int break_flag;
80
81 #ifdef CONFIG_SUPERH
82 /* Port clock */
83 struct clk *clk;
84 #endif
85 };
86
87 #ifdef CONFIG_SH_KGDB
88 static struct sci_port *kgdb_sci_port;
89 #endif
90
91 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
92 static struct sci_port *serial_console_port;
93 #endif
94
95 /* Function prototypes */
96 static void sci_stop_tx(struct uart_port *port);
97
98 #define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS
99
100 static struct sci_port sci_ports[SCI_NPORTS];
101 static struct uart_driver sci_uart_driver;
102
103 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && \
104 defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
105 static inline void handle_error(struct uart_port *port)
106 {
107 /* Clear error flags */
108 sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
109 }
110
111 static int get_char(struct uart_port *port)
112 {
113 unsigned long flags;
114 unsigned short status;
115 int c;
116
117 spin_lock_irqsave(&port->lock, flags);
118 do {
119 status = sci_in(port, SCxSR);
120 if (status & SCxSR_ERRORS(port)) {
121 handle_error(port);
122 continue;
123 }
124 } while (!(status & SCxSR_RDxF(port)));
125 c = sci_in(port, SCxRDR);
126 sci_in(port, SCxSR); /* Dummy read */
127 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
128 spin_unlock_irqrestore(&port->lock, flags);
129
130 return c;
131 }
132 #endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
133
134 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) || defined(CONFIG_SH_KGDB)
135 static void put_char(struct uart_port *port, char c)
136 {
137 unsigned long flags;
138 unsigned short status;
139
140 spin_lock_irqsave(&port->lock, flags);
141
142 do {
143 status = sci_in(port, SCxSR);
144 } while (!(status & SCxSR_TDxE(port)));
145
146 sci_out(port, SCxTDR, c);
147 sci_in(port, SCxSR); /* Dummy read */
148 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
149
150 spin_unlock_irqrestore(&port->lock, flags);
151 }
152 #endif
153
154 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
155 static void put_string(struct sci_port *sci_port, const char *buffer, int count)
156 {
157 struct uart_port *port = &sci_port->port;
158 const unsigned char *p = buffer;
159 int i;
160
161 #if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
162 int checksum;
163 int usegdb=0;
164
165 #ifdef CONFIG_SH_STANDARD_BIOS
166 /* This call only does a trap the first time it is
167 * called, and so is safe to do here unconditionally
168 */
169 usegdb |= sh_bios_in_gdb_mode();
170 #endif
171 #ifdef CONFIG_SH_KGDB
172 usegdb |= (kgdb_in_gdb_mode && (sci_port == kgdb_sci_port));
173 #endif
174
175 if (usegdb) {
176 /* $<packet info>#<checksum>. */
177 do {
178 unsigned char c;
179 put_char(port, '$');
180 put_char(port, 'O'); /* 'O'utput to console */
181 checksum = 'O';
182
183 for (i=0; i<count; i++) { /* Don't use run length encoding */
184 int h, l;
185
186 c = *p++;
187 h = hex_asc_hi(c);
188 l = hex_asc_lo(c);
189 put_char(port, h);
190 put_char(port, l);
191 checksum += h + l;
192 }
193 put_char(port, '#');
194 put_char(port, hex_asc_hi(checksum));
195 put_char(port, hex_asc_lo(checksum));
196 } while (get_char(port) != '+');
197 } else
198 #endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
199 for (i=0; i<count; i++) {
200 if (*p == 10)
201 put_char(port, '\r');
202 put_char(port, *p++);
203 }
204 }
205 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
206
207 #ifdef CONFIG_SH_KGDB
208 static int kgdb_sci_getchar(void)
209 {
210 int c;
211
212 /* Keep trying to read a character, this could be neater */
213 while ((c = get_char(&kgdb_sci_port->port)) < 0)
214 cpu_relax();
215
216 return c;
217 }
218
219 static inline void kgdb_sci_putchar(int c)
220 {
221 put_char(&kgdb_sci_port->port, c);
222 }
223 #endif /* CONFIG_SH_KGDB */
224
225 #if defined(__H8300S__)
226 enum { sci_disable, sci_enable };
227
228 static void h8300_sci_config(struct uart_port* port, unsigned int ctrl)
229 {
230 volatile unsigned char *mstpcrl=(volatile unsigned char *)MSTPCRL;
231 int ch = (port->mapbase - SMR0) >> 3;
232 unsigned char mask = 1 << (ch+1);
233
234 if (ctrl == sci_disable) {
235 *mstpcrl |= mask;
236 } else {
237 *mstpcrl &= ~mask;
238 }
239 }
240
241 static inline void h8300_sci_enable(struct uart_port *port)
242 {
243 h8300_sci_config(port, sci_enable);
244 }
245
246 static inline void h8300_sci_disable(struct uart_port *port)
247 {
248 h8300_sci_config(port, sci_disable);
249 }
250 #endif
251
252 #if defined(SCI_ONLY) || defined(SCI_AND_SCIF) && \
253 defined(__H8300H__) || defined(__H8300S__)
254 static void sci_init_pins_sci(struct uart_port* port, unsigned int cflag)
255 {
256 int ch = (port->mapbase - SMR0) >> 3;
257
258 /* set DDR regs */
259 H8300_GPIO_DDR(h8300_sci_pins[ch].port,
260 h8300_sci_pins[ch].rx,
261 H8300_GPIO_INPUT);
262 H8300_GPIO_DDR(h8300_sci_pins[ch].port,
263 h8300_sci_pins[ch].tx,
264 H8300_GPIO_OUTPUT);
265
266 /* tx mark output*/
267 H8300_SCI_DR(ch) |= h8300_sci_pins[ch].tx;
268 }
269 #else
270 #define sci_init_pins_sci NULL
271 #endif
272
273 #if defined(CONFIG_CPU_SUBTYPE_SH7707) || defined(CONFIG_CPU_SUBTYPE_SH7709)
274 static void sci_init_pins_irda(struct uart_port *port, unsigned int cflag)
275 {
276 unsigned int fcr_val = 0;
277
278 if (cflag & CRTSCTS)
279 fcr_val |= SCFCR_MCE;
280
281 sci_out(port, SCFCR, fcr_val);
282 }
283 #else
284 #define sci_init_pins_irda NULL
285 #endif
286
287 #ifdef SCI_ONLY
288 #define sci_init_pins_scif NULL
289 #endif
290
291 #if defined(SCIF_ONLY) || defined(SCI_AND_SCIF)
292 #if defined(CONFIG_CPU_SUBTYPE_SH7710) || defined(CONFIG_CPU_SUBTYPE_SH7712)
293 static void sci_init_pins_scif(struct uart_port* port, unsigned int cflag)
294 {
295 unsigned int fcr_val = 0;
296
297 set_sh771x_scif_pfc(port);
298 if (cflag & CRTSCTS) {
299 fcr_val |= SCFCR_MCE;
300 }
301 sci_out(port, SCFCR, fcr_val);
302 }
303 #elif defined(CONFIG_CPU_SUBTYPE_SH7720) || defined(CONFIG_CPU_SUBTYPE_SH7721)
304 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
305 {
306 unsigned int fcr_val = 0;
307 unsigned short data;
308
309 if (cflag & CRTSCTS) {
310 /* enable RTS/CTS */
311 if (port->mapbase == 0xa4430000) { /* SCIF0 */
312 /* Clear PTCR bit 9-2; enable all scif pins but sck */
313 data = ctrl_inw(PORT_PTCR);
314 ctrl_outw((data & 0xfc03), PORT_PTCR);
315 } else if (port->mapbase == 0xa4438000) { /* SCIF1 */
316 /* Clear PVCR bit 9-2 */
317 data = ctrl_inw(PORT_PVCR);
318 ctrl_outw((data & 0xfc03), PORT_PVCR);
319 }
320 fcr_val |= SCFCR_MCE;
321 } else {
322 if (port->mapbase == 0xa4430000) { /* SCIF0 */
323 /* Clear PTCR bit 5-2; enable only tx and rx */
324 data = ctrl_inw(PORT_PTCR);
325 ctrl_outw((data & 0xffc3), PORT_PTCR);
326 } else if (port->mapbase == 0xa4438000) { /* SCIF1 */
327 /* Clear PVCR bit 5-2 */
328 data = ctrl_inw(PORT_PVCR);
329 ctrl_outw((data & 0xffc3), PORT_PVCR);
330 }
331 }
332 sci_out(port, SCFCR, fcr_val);
333 }
334 #elif defined(CONFIG_CPU_SH3)
335 /* For SH7705, SH7706, SH7707, SH7709, SH7709A, SH7729 */
336 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
337 {
338 unsigned int fcr_val = 0;
339 unsigned short data;
340
341 /* We need to set SCPCR to enable RTS/CTS */
342 data = ctrl_inw(SCPCR);
343 /* Clear out SCP7MD1,0, SCP6MD1,0, SCP4MD1,0*/
344 ctrl_outw(data & 0x0fcf, SCPCR);
345
346 if (cflag & CRTSCTS)
347 fcr_val |= SCFCR_MCE;
348 else {
349 /* We need to set SCPCR to enable RTS/CTS */
350 data = ctrl_inw(SCPCR);
351 /* Clear out SCP7MD1,0, SCP4MD1,0,
352 Set SCP6MD1,0 = {01} (output) */
353 ctrl_outw((data & 0x0fcf) | 0x1000, SCPCR);
354
355 data = ctrl_inb(SCPDR);
356 /* Set /RTS2 (bit6) = 0 */
357 ctrl_outb(data & 0xbf, SCPDR);
358 }
359
360 sci_out(port, SCFCR, fcr_val);
361 }
362 #elif defined(CONFIG_CPU_SUBTYPE_SH7722)
363 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
364 {
365 unsigned int fcr_val = 0;
366 unsigned short data;
367
368 if (port->mapbase == 0xffe00000) {
369 data = ctrl_inw(PSCR);
370 data &= ~0x03cf;
371 if (cflag & CRTSCTS)
372 fcr_val |= SCFCR_MCE;
373 else
374 data |= 0x0340;
375
376 ctrl_outw(data, PSCR);
377 }
378 /* SCIF1 and SCIF2 should be setup by board code */
379
380 sci_out(port, SCFCR, fcr_val);
381 }
382 #elif defined(CONFIG_CPU_SUBTYPE_SH7723)
383 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
384 {
385 /* Nothing to do here.. */
386 sci_out(port, SCFCR, 0);
387 }
388 #else
389 /* For SH7750 */
390 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
391 {
392 unsigned int fcr_val = 0;
393
394 if (cflag & CRTSCTS) {
395 fcr_val |= SCFCR_MCE;
396 } else {
397 #if defined(CONFIG_CPU_SUBTYPE_SH7343) || defined(CONFIG_CPU_SUBTYPE_SH7366)
398 /* Nothing */
399 #elif defined(CONFIG_CPU_SUBTYPE_SH7763) || \
400 defined(CONFIG_CPU_SUBTYPE_SH7780) || \
401 defined(CONFIG_CPU_SUBTYPE_SH7785) || \
402 defined(CONFIG_CPU_SUBTYPE_SHX3)
403 ctrl_outw(0x0080, SCSPTR0); /* Set RTS = 1 */
404 #else
405 ctrl_outw(0x0080, SCSPTR2); /* Set RTS = 1 */
406 #endif
407 }
408 sci_out(port, SCFCR, fcr_val);
409 }
410 #endif
411
412 #if defined(CONFIG_CPU_SUBTYPE_SH7760) || \
413 defined(CONFIG_CPU_SUBTYPE_SH7763) || \
414 defined(CONFIG_CPU_SUBTYPE_SH7780) || \
415 defined(CONFIG_CPU_SUBTYPE_SH7785)
416 static inline int scif_txroom(struct uart_port *port)
417 {
418 return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0xff);
419 }
420
421 static inline int scif_rxroom(struct uart_port *port)
422 {
423 return sci_in(port, SCRFDR) & 0xff;
424 }
425 #else
426 static inline int scif_txroom(struct uart_port *port)
427 {
428 return SCIF_TXROOM_MAX - (sci_in(port, SCFDR) >> 8);
429 }
430
431 static inline int scif_rxroom(struct uart_port *port)
432 {
433 return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
434 }
435 #endif
436 #endif /* SCIF_ONLY || SCI_AND_SCIF */
437
438 static inline int sci_txroom(struct uart_port *port)
439 {
440 return ((sci_in(port, SCxSR) & SCI_TDRE) != 0);
441 }
442
443 static inline int sci_rxroom(struct uart_port *port)
444 {
445 return ((sci_in(port, SCxSR) & SCxSR_RDxF(port)) != 0);
446 }
447
448 /* ********************************************************************** *
449 * the interrupt related routines *
450 * ********************************************************************** */
451
452 static void sci_transmit_chars(struct uart_port *port)
453 {
454 struct circ_buf *xmit = &port->info->xmit;
455 unsigned int stopped = uart_tx_stopped(port);
456 unsigned short status;
457 unsigned short ctrl;
458 int count;
459
460 status = sci_in(port, SCxSR);
461 if (!(status & SCxSR_TDxE(port))) {
462 ctrl = sci_in(port, SCSCR);
463 if (uart_circ_empty(xmit)) {
464 ctrl &= ~SCI_CTRL_FLAGS_TIE;
465 } else {
466 ctrl |= SCI_CTRL_FLAGS_TIE;
467 }
468 sci_out(port, SCSCR, ctrl);
469 return;
470 }
471
472 #ifndef SCI_ONLY
473 if (port->type == PORT_SCIF)
474 count = scif_txroom(port);
475 else
476 #endif
477 count = sci_txroom(port);
478
479 do {
480 unsigned char c;
481
482 if (port->x_char) {
483 c = port->x_char;
484 port->x_char = 0;
485 } else if (!uart_circ_empty(xmit) && !stopped) {
486 c = xmit->buf[xmit->tail];
487 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
488 } else {
489 break;
490 }
491
492 sci_out(port, SCxTDR, c);
493
494 port->icount.tx++;
495 } while (--count > 0);
496
497 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
498
499 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
500 uart_write_wakeup(port);
501 if (uart_circ_empty(xmit)) {
502 sci_stop_tx(port);
503 } else {
504 ctrl = sci_in(port, SCSCR);
505
506 #if !defined(SCI_ONLY)
507 if (port->type == PORT_SCIF) {
508 sci_in(port, SCxSR); /* Dummy read */
509 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
510 }
511 #endif
512
513 ctrl |= SCI_CTRL_FLAGS_TIE;
514 sci_out(port, SCSCR, ctrl);
515 }
516 }
517
518 /* On SH3, SCIF may read end-of-break as a space->mark char */
519 #define STEPFN(c) ({int __c=(c); (((__c-1)|(__c)) == -1); })
520
521 static inline void sci_receive_chars(struct uart_port *port)
522 {
523 struct sci_port *sci_port = (struct sci_port *)port;
524 struct tty_struct *tty = port->info->tty;
525 int i, count, copied = 0;
526 unsigned short status;
527 unsigned char flag;
528
529 status = sci_in(port, SCxSR);
530 if (!(status & SCxSR_RDxF(port)))
531 return;
532
533 while (1) {
534 #if !defined(SCI_ONLY)
535 if (port->type == PORT_SCIF)
536 count = scif_rxroom(port);
537 else
538 #endif
539 count = sci_rxroom(port);
540
541 /* Don't copy more bytes than there is room for in the buffer */
542 count = tty_buffer_request_room(tty, count);
543
544 /* If for any reason we can't copy more data, we're done! */
545 if (count == 0)
546 break;
547
548 if (port->type == PORT_SCI) {
549 char c = sci_in(port, SCxRDR);
550 if (uart_handle_sysrq_char(port, c) || sci_port->break_flag)
551 count = 0;
552 else {
553 tty_insert_flip_char(tty, c, TTY_NORMAL);
554 }
555 } else {
556 for (i=0; i<count; i++) {
557 char c = sci_in(port, SCxRDR);
558 status = sci_in(port, SCxSR);
559 #if defined(CONFIG_CPU_SH3)
560 /* Skip "chars" during break */
561 if (sci_port->break_flag) {
562 if ((c == 0) &&
563 (status & SCxSR_FER(port))) {
564 count--; i--;
565 continue;
566 }
567
568 /* Nonzero => end-of-break */
569 pr_debug("scif: debounce<%02x>\n", c);
570 sci_port->break_flag = 0;
571
572 if (STEPFN(c)) {
573 count--; i--;
574 continue;
575 }
576 }
577 #endif /* CONFIG_CPU_SH3 */
578 if (uart_handle_sysrq_char(port, c)) {
579 count--; i--;
580 continue;
581 }
582
583 /* Store data and status */
584 if (status&SCxSR_FER(port)) {
585 flag = TTY_FRAME;
586 pr_debug("sci: frame error\n");
587 } else if (status&SCxSR_PER(port)) {
588 flag = TTY_PARITY;
589 pr_debug("sci: parity error\n");
590 } else
591 flag = TTY_NORMAL;
592 tty_insert_flip_char(tty, c, flag);
593 }
594 }
595
596 sci_in(port, SCxSR); /* dummy read */
597 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
598
599 copied += count;
600 port->icount.rx += count;
601 }
602
603 if (copied) {
604 /* Tell the rest of the system the news. New characters! */
605 tty_flip_buffer_push(tty);
606 } else {
607 sci_in(port, SCxSR); /* dummy read */
608 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
609 }
610 }
611
612 #define SCI_BREAK_JIFFIES (HZ/20)
613 /* The sci generates interrupts during the break,
614 * 1 per millisecond or so during the break period, for 9600 baud.
615 * So dont bother disabling interrupts.
616 * But dont want more than 1 break event.
617 * Use a kernel timer to periodically poll the rx line until
618 * the break is finished.
619 */
620 static void sci_schedule_break_timer(struct sci_port *port)
621 {
622 port->break_timer.expires = jiffies + SCI_BREAK_JIFFIES;
623 add_timer(&port->break_timer);
624 }
625 /* Ensure that two consecutive samples find the break over. */
626 static void sci_break_timer(unsigned long data)
627 {
628 struct sci_port *port = (struct sci_port *)data;
629
630 if (sci_rxd_in(&port->port) == 0) {
631 port->break_flag = 1;
632 sci_schedule_break_timer(port);
633 } else if (port->break_flag == 1) {
634 /* break is over. */
635 port->break_flag = 2;
636 sci_schedule_break_timer(port);
637 } else
638 port->break_flag = 0;
639 }
640
641 static inline int sci_handle_errors(struct uart_port *port)
642 {
643 int copied = 0;
644 unsigned short status = sci_in(port, SCxSR);
645 struct tty_struct *tty = port->info->tty;
646
647 if (status & SCxSR_ORER(port)) {
648 /* overrun error */
649 if (tty_insert_flip_char(tty, 0, TTY_OVERRUN))
650 copied++;
651 pr_debug("sci: overrun error\n");
652 }
653
654 if (status & SCxSR_FER(port)) {
655 if (sci_rxd_in(port) == 0) {
656 /* Notify of BREAK */
657 struct sci_port *sci_port = (struct sci_port *)port;
658
659 if (!sci_port->break_flag) {
660 sci_port->break_flag = 1;
661 sci_schedule_break_timer(sci_port);
662
663 /* Do sysrq handling. */
664 if (uart_handle_break(port))
665 return 0;
666 pr_debug("sci: BREAK detected\n");
667 if (tty_insert_flip_char(tty, 0, TTY_BREAK))
668 copied++;
669 }
670 } else {
671 /* frame error */
672 if (tty_insert_flip_char(tty, 0, TTY_FRAME))
673 copied++;
674 pr_debug("sci: frame error\n");
675 }
676 }
677
678 if (status & SCxSR_PER(port)) {
679 /* parity error */
680 if (tty_insert_flip_char(tty, 0, TTY_PARITY))
681 copied++;
682 pr_debug("sci: parity error\n");
683 }
684
685 if (copied)
686 tty_flip_buffer_push(tty);
687
688 return copied;
689 }
690
691 static inline int sci_handle_breaks(struct uart_port *port)
692 {
693 int copied = 0;
694 unsigned short status = sci_in(port, SCxSR);
695 struct tty_struct *tty = port->info->tty;
696 struct sci_port *s = &sci_ports[port->line];
697
698 if (uart_handle_break(port))
699 return 0;
700
701 if (!s->break_flag && status & SCxSR_BRK(port)) {
702 #if defined(CONFIG_CPU_SH3)
703 /* Debounce break */
704 s->break_flag = 1;
705 #endif
706 /* Notify of BREAK */
707 if (tty_insert_flip_char(tty, 0, TTY_BREAK))
708 copied++;
709 pr_debug("sci: BREAK detected\n");
710 }
711
712 #if defined(SCIF_ORER)
713 /* XXX: Handle SCIF overrun error */
714 if (port->type == PORT_SCIF && (sci_in(port, SCLSR) & SCIF_ORER) != 0) {
715 sci_out(port, SCLSR, 0);
716 if (tty_insert_flip_char(tty, 0, TTY_OVERRUN)) {
717 copied++;
718 pr_debug("sci: overrun error\n");
719 }
720 }
721 #endif
722
723 if (copied)
724 tty_flip_buffer_push(tty);
725
726 return copied;
727 }
728
729 static irqreturn_t sci_rx_interrupt(int irq, void *port)
730 {
731 /* I think sci_receive_chars has to be called irrespective
732 * of whether the I_IXOFF is set, otherwise, how is the interrupt
733 * to be disabled?
734 */
735 sci_receive_chars(port);
736
737 return IRQ_HANDLED;
738 }
739
740 static irqreturn_t sci_tx_interrupt(int irq, void *ptr)
741 {
742 struct uart_port *port = ptr;
743
744 spin_lock_irq(&port->lock);
745 sci_transmit_chars(port);
746 spin_unlock_irq(&port->lock);
747
748 return IRQ_HANDLED;
749 }
750
751 static irqreturn_t sci_er_interrupt(int irq, void *ptr)
752 {
753 struct uart_port *port = ptr;
754
755 /* Handle errors */
756 if (port->type == PORT_SCI) {
757 if (sci_handle_errors(port)) {
758 /* discard character in rx buffer */
759 sci_in(port, SCxSR);
760 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
761 }
762 } else {
763 #if defined(SCIF_ORER)
764 if((sci_in(port, SCLSR) & SCIF_ORER) != 0) {
765 struct tty_struct *tty = port->info->tty;
766
767 sci_out(port, SCLSR, 0);
768 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
769 tty_flip_buffer_push(tty);
770 pr_debug("scif: overrun error\n");
771 }
772 #endif
773 sci_rx_interrupt(irq, ptr);
774 }
775
776 sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
777
778 /* Kick the transmission */
779 sci_tx_interrupt(irq, ptr);
780
781 return IRQ_HANDLED;
782 }
783
784 static irqreturn_t sci_br_interrupt(int irq, void *ptr)
785 {
786 struct uart_port *port = ptr;
787
788 /* Handle BREAKs */
789 sci_handle_breaks(port);
790 sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port));
791
792 return IRQ_HANDLED;
793 }
794
795 static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
796 {
797 unsigned short ssr_status, scr_status;
798 struct uart_port *port = ptr;
799
800 ssr_status = sci_in(port,SCxSR);
801 scr_status = sci_in(port,SCSCR);
802
803 /* Tx Interrupt */
804 if ((ssr_status & 0x0020) && (scr_status & 0x0080))
805 sci_tx_interrupt(irq, ptr);
806 /* Rx Interrupt */
807 if ((ssr_status & 0x0002) && (scr_status & 0x0040))
808 sci_rx_interrupt(irq, ptr);
809 /* Error Interrupt */
810 if ((ssr_status & 0x0080) && (scr_status & 0x0400))
811 sci_er_interrupt(irq, ptr);
812 /* Break Interrupt */
813 if ((ssr_status & 0x0010) && (scr_status & 0x0200))
814 sci_br_interrupt(irq, ptr);
815
816 return IRQ_HANDLED;
817 }
818
819 #ifdef CONFIG_CPU_FREQ
820 /*
821 * Here we define a transistion notifier so that we can update all of our
822 * ports' baud rate when the peripheral clock changes.
823 */
824 static int sci_notifier(struct notifier_block *self,
825 unsigned long phase, void *p)
826 {
827 struct cpufreq_freqs *freqs = p;
828 int i;
829
830 if ((phase == CPUFREQ_POSTCHANGE) ||
831 (phase == CPUFREQ_RESUMECHANGE)){
832 for (i = 0; i < SCI_NPORTS; i++) {
833 struct uart_port *port = &sci_ports[i].port;
834 struct clk *clk;
835
836 /*
837 * Update the uartclk per-port if frequency has
838 * changed, since it will no longer necessarily be
839 * consistent with the old frequency.
840 *
841 * Really we want to be able to do something like
842 * uart_change_speed() or something along those lines
843 * here to implicitly reset the per-port baud rate..
844 *
845 * Clean this up later..
846 */
847 clk = clk_get(NULL, "module_clk");
848 port->uartclk = clk_get_rate(clk) * 16;
849 clk_put(clk);
850 }
851
852 printk(KERN_INFO "%s: got a postchange notification "
853 "for cpu %d (old %d, new %d)\n",
854 __func__, freqs->cpu, freqs->old, freqs->new);
855 }
856
857 return NOTIFY_OK;
858 }
859
860 static struct notifier_block sci_nb = { &sci_notifier, NULL, 0 };
861 #endif /* CONFIG_CPU_FREQ */
862
863 static int sci_request_irq(struct sci_port *port)
864 {
865 int i;
866 irqreturn_t (*handlers[4])(int irq, void *ptr) = {
867 sci_er_interrupt, sci_rx_interrupt, sci_tx_interrupt,
868 sci_br_interrupt,
869 };
870 const char *desc[] = { "SCI Receive Error", "SCI Receive Data Full",
871 "SCI Transmit Data Empty", "SCI Break" };
872
873 if (port->irqs[0] == port->irqs[1]) {
874 if (!port->irqs[0]) {
875 printk(KERN_ERR "sci: Cannot allocate irq.(IRQ=0)\n");
876 return -ENODEV;
877 }
878
879 if (request_irq(port->irqs[0], sci_mpxed_interrupt,
880 IRQF_DISABLED, "sci", port)) {
881 printk(KERN_ERR "sci: Cannot allocate irq.\n");
882 return -ENODEV;
883 }
884 } else {
885 for (i = 0; i < ARRAY_SIZE(handlers); i++) {
886 if (!port->irqs[i])
887 continue;
888 if (request_irq(port->irqs[i], handlers[i],
889 IRQF_DISABLED, desc[i], port)) {
890 printk(KERN_ERR "sci: Cannot allocate irq.\n");
891 return -ENODEV;
892 }
893 }
894 }
895
896 return 0;
897 }
898
899 static void sci_free_irq(struct sci_port *port)
900 {
901 int i;
902
903 if (port->irqs[0] == port->irqs[1]) {
904 if (!port->irqs[0])
905 printk("sci: sci_free_irq error\n");
906 else
907 free_irq(port->irqs[0], port);
908 } else {
909 for (i = 0; i < ARRAY_SIZE(port->irqs); i++) {
910 if (!port->irqs[i])
911 continue;
912
913 free_irq(port->irqs[i], port);
914 }
915 }
916 }
917
918 static unsigned int sci_tx_empty(struct uart_port *port)
919 {
920 /* Can't detect */
921 return TIOCSER_TEMT;
922 }
923
924 static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl)
925 {
926 /* This routine is used for seting signals of: DTR, DCD, CTS/RTS */
927 /* We use SCIF's hardware for CTS/RTS, so don't need any for that. */
928 /* If you have signals for DTR and DCD, please implement here. */
929 }
930
931 static unsigned int sci_get_mctrl(struct uart_port *port)
932 {
933 /* This routine is used for geting signals of: DTR, DCD, DSR, RI,
934 and CTS/RTS */
935
936 return TIOCM_DTR | TIOCM_RTS | TIOCM_DSR;
937 }
938
939 static void sci_start_tx(struct uart_port *port)
940 {
941 unsigned short ctrl;
942
943 /* Set TIE (Transmit Interrupt Enable) bit in SCSCR */
944 ctrl = sci_in(port, SCSCR);
945 ctrl |= SCI_CTRL_FLAGS_TIE;
946 sci_out(port, SCSCR, ctrl);
947 }
948
949 static void sci_stop_tx(struct uart_port *port)
950 {
951 unsigned short ctrl;
952
953 /* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */
954 ctrl = sci_in(port, SCSCR);
955 ctrl &= ~SCI_CTRL_FLAGS_TIE;
956 sci_out(port, SCSCR, ctrl);
957 }
958
959 static void sci_start_rx(struct uart_port *port, unsigned int tty_start)
960 {
961 unsigned short ctrl;
962
963 /* Set RIE (Receive Interrupt Enable) bit in SCSCR */
964 ctrl = sci_in(port, SCSCR);
965 ctrl |= SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE;
966 sci_out(port, SCSCR, ctrl);
967 }
968
969 static void sci_stop_rx(struct uart_port *port)
970 {
971 unsigned short ctrl;
972
973 /* Clear RIE (Receive Interrupt Enable) bit in SCSCR */
974 ctrl = sci_in(port, SCSCR);
975 ctrl &= ~(SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE);
976 sci_out(port, SCSCR, ctrl);
977 }
978
979 static void sci_enable_ms(struct uart_port *port)
980 {
981 /* Nothing here yet .. */
982 }
983
984 static void sci_break_ctl(struct uart_port *port, int break_state)
985 {
986 /* Nothing here yet .. */
987 }
988
989 static int sci_startup(struct uart_port *port)
990 {
991 struct sci_port *s = &sci_ports[port->line];
992
993 if (s->enable)
994 s->enable(port);
995
996 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
997 s->clk = clk_get(NULL, "module_clk");
998 #endif
999
1000 sci_request_irq(s);
1001 sci_start_tx(port);
1002 sci_start_rx(port, 1);
1003
1004 return 0;
1005 }
1006
1007 static void sci_shutdown(struct uart_port *port)
1008 {
1009 struct sci_port *s = &sci_ports[port->line];
1010
1011 sci_stop_rx(port);
1012 sci_stop_tx(port);
1013 sci_free_irq(s);
1014
1015 if (s->disable)
1016 s->disable(port);
1017
1018 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
1019 clk_put(s->clk);
1020 s->clk = NULL;
1021 #endif
1022 }
1023
1024 static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
1025 struct ktermios *old)
1026 {
1027 struct sci_port *s = &sci_ports[port->line];
1028 unsigned int status, baud, smr_val;
1029 int t;
1030
1031 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
1032
1033 switch (baud) {
1034 case 0:
1035 t = -1;
1036 break;
1037 default:
1038 {
1039 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
1040 t = SCBRR_VALUE(baud, clk_get_rate(s->clk));
1041 #else
1042 t = SCBRR_VALUE(baud);
1043 #endif
1044 break;
1045 }
1046 }
1047
1048 do {
1049 status = sci_in(port, SCxSR);
1050 } while (!(status & SCxSR_TEND(port)));
1051
1052 sci_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */
1053
1054 #if !defined(SCI_ONLY)
1055 if (port->type == PORT_SCIF)
1056 sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
1057 #endif
1058
1059 smr_val = sci_in(port, SCSMR) & 3;
1060 if ((termios->c_cflag & CSIZE) == CS7)
1061 smr_val |= 0x40;
1062 if (termios->c_cflag & PARENB)
1063 smr_val |= 0x20;
1064 if (termios->c_cflag & PARODD)
1065 smr_val |= 0x30;
1066 if (termios->c_cflag & CSTOPB)
1067 smr_val |= 0x08;
1068
1069 uart_update_timeout(port, termios->c_cflag, baud);
1070
1071 sci_out(port, SCSMR, smr_val);
1072
1073 if (t > 0) {
1074 if(t >= 256) {
1075 sci_out(port, SCSMR, (sci_in(port, SCSMR) & ~3) | 1);
1076 t >>= 2;
1077 } else {
1078 sci_out(port, SCSMR, sci_in(port, SCSMR) & ~3);
1079 }
1080 sci_out(port, SCBRR, t);
1081 udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
1082 }
1083
1084 if (likely(s->init_pins))
1085 s->init_pins(port, termios->c_cflag);
1086
1087 sci_out(port, SCSCR, SCSCR_INIT(port));
1088
1089 if ((termios->c_cflag & CREAD) != 0)
1090 sci_start_rx(port,0);
1091 }
1092
1093 static const char *sci_type(struct uart_port *port)
1094 {
1095 switch (port->type) {
1096 case PORT_SCI: return "sci";
1097 case PORT_SCIF: return "scif";
1098 case PORT_IRDA: return "irda";
1099 }
1100
1101 return 0;
1102 }
1103
1104 static void sci_release_port(struct uart_port *port)
1105 {
1106 /* Nothing here yet .. */
1107 }
1108
1109 static int sci_request_port(struct uart_port *port)
1110 {
1111 /* Nothing here yet .. */
1112 return 0;
1113 }
1114
1115 static void sci_config_port(struct uart_port *port, int flags)
1116 {
1117 struct sci_port *s = &sci_ports[port->line];
1118
1119 port->type = s->type;
1120
1121 switch (port->type) {
1122 case PORT_SCI:
1123 s->init_pins = sci_init_pins_sci;
1124 break;
1125 case PORT_SCIF:
1126 s->init_pins = sci_init_pins_scif;
1127 break;
1128 case PORT_IRDA:
1129 s->init_pins = sci_init_pins_irda;
1130 break;
1131 }
1132
1133 #if defined(CONFIG_CPU_SUBTYPE_SH5_101) || defined(CONFIG_CPU_SUBTYPE_SH5_103)
1134 if (port->mapbase == 0)
1135 port->mapbase = onchip_remap(SCIF_ADDR_SH5, 1024, "SCIF");
1136
1137 port->membase = (void __iomem *)port->mapbase;
1138 #endif
1139 }
1140
1141 static int sci_verify_port(struct uart_port *port, struct serial_struct *ser)
1142 {
1143 struct sci_port *s = &sci_ports[port->line];
1144
1145 if (ser->irq != s->irqs[SCIx_TXI_IRQ] || ser->irq > NR_IRQS)
1146 return -EINVAL;
1147 if (ser->baud_base < 2400)
1148 /* No paper tape reader for Mitch.. */
1149 return -EINVAL;
1150
1151 return 0;
1152 }
1153
1154 static struct uart_ops sci_uart_ops = {
1155 .tx_empty = sci_tx_empty,
1156 .set_mctrl = sci_set_mctrl,
1157 .get_mctrl = sci_get_mctrl,
1158 .start_tx = sci_start_tx,
1159 .stop_tx = sci_stop_tx,
1160 .stop_rx = sci_stop_rx,
1161 .enable_ms = sci_enable_ms,
1162 .break_ctl = sci_break_ctl,
1163 .startup = sci_startup,
1164 .shutdown = sci_shutdown,
1165 .set_termios = sci_set_termios,
1166 .type = sci_type,
1167 .release_port = sci_release_port,
1168 .request_port = sci_request_port,
1169 .config_port = sci_config_port,
1170 .verify_port = sci_verify_port,
1171 };
1172
1173 static void __init sci_init_ports(void)
1174 {
1175 static int first = 1;
1176 int i;
1177
1178 if (!first)
1179 return;
1180
1181 first = 0;
1182
1183 for (i = 0; i < SCI_NPORTS; i++) {
1184 sci_ports[i].port.ops = &sci_uart_ops;
1185 sci_ports[i].port.iotype = UPIO_MEM;
1186 sci_ports[i].port.line = i;
1187 sci_ports[i].port.fifosize = 1;
1188
1189 #if defined(__H8300H__) || defined(__H8300S__)
1190 #ifdef __H8300S__
1191 sci_ports[i].enable = h8300_sci_enable;
1192 sci_ports[i].disable = h8300_sci_disable;
1193 #endif
1194 sci_ports[i].port.uartclk = CONFIG_CPU_CLOCK;
1195 #elif defined(CONFIG_SUPERH64)
1196 sci_ports[i].port.uartclk = current_cpu_data.module_clock * 16;
1197 #else
1198 /*
1199 * XXX: We should use a proper SCI/SCIF clock
1200 */
1201 {
1202 struct clk *clk = clk_get(NULL, "module_clk");
1203 sci_ports[i].port.uartclk = clk_get_rate(clk) * 16;
1204 clk_put(clk);
1205 }
1206 #endif
1207
1208 sci_ports[i].break_timer.data = (unsigned long)&sci_ports[i];
1209 sci_ports[i].break_timer.function = sci_break_timer;
1210
1211 init_timer(&sci_ports[i].break_timer);
1212 }
1213 }
1214
1215 int __init early_sci_setup(struct uart_port *port)
1216 {
1217 if (unlikely(port->line > SCI_NPORTS))
1218 return -ENODEV;
1219
1220 sci_init_ports();
1221
1222 sci_ports[port->line].port.membase = port->membase;
1223 sci_ports[port->line].port.mapbase = port->mapbase;
1224 sci_ports[port->line].port.type = port->type;
1225
1226 return 0;
1227 }
1228
1229 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
1230 /*
1231 * Print a string to the serial port trying not to disturb
1232 * any possible real use of the port...
1233 */
1234 static void serial_console_write(struct console *co, const char *s,
1235 unsigned count)
1236 {
1237 put_string(serial_console_port, s, count);
1238 }
1239
1240 static int __init serial_console_setup(struct console *co, char *options)
1241 {
1242 struct uart_port *port;
1243 int baud = 115200;
1244 int bits = 8;
1245 int parity = 'n';
1246 int flow = 'n';
1247 int ret;
1248
1249 /*
1250 * Check whether an invalid uart number has been specified, and
1251 * if so, search for the first available port that does have
1252 * console support.
1253 */
1254 if (co->index >= SCI_NPORTS)
1255 co->index = 0;
1256
1257 serial_console_port = &sci_ports[co->index];
1258 port = &serial_console_port->port;
1259
1260 /*
1261 * Also need to check port->type, we don't actually have any
1262 * UPIO_PORT ports, but uart_report_port() handily misreports
1263 * it anyways if we don't have a port available by the time this is
1264 * called.
1265 */
1266 if (!port->type)
1267 return -ENODEV;
1268 if (!port->membase || !port->mapbase)
1269 return -ENODEV;
1270
1271 port->type = serial_console_port->type;
1272
1273 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
1274 if (!serial_console_port->clk)
1275 serial_console_port->clk = clk_get(NULL, "module_clk");
1276 #endif
1277
1278 if (port->flags & UPF_IOREMAP)
1279 sci_config_port(port, 0);
1280
1281 if (serial_console_port->enable)
1282 serial_console_port->enable(port);
1283
1284 if (options)
1285 uart_parse_options(options, &baud, &parity, &bits, &flow);
1286
1287 ret = uart_set_options(port, co, baud, parity, bits, flow);
1288 #if defined(__H8300H__) || defined(__H8300S__)
1289 /* disable rx interrupt */
1290 if (ret == 0)
1291 sci_stop_rx(port);
1292 #endif
1293 return ret;
1294 }
1295
1296 static struct console serial_console = {
1297 .name = "ttySC",
1298 .device = uart_console_device,
1299 .write = serial_console_write,
1300 .setup = serial_console_setup,
1301 .flags = CON_PRINTBUFFER,
1302 .index = -1,
1303 .data = &sci_uart_driver,
1304 };
1305
1306 static int __init sci_console_init(void)
1307 {
1308 sci_init_ports();
1309 register_console(&serial_console);
1310 return 0;
1311 }
1312 console_initcall(sci_console_init);
1313 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
1314
1315 #ifdef CONFIG_SH_KGDB_CONSOLE
1316 /*
1317 * FIXME: Most of this can go away.. at the moment, we rely on
1318 * arch/sh/kernel/setup.c to do the command line parsing for kgdb, though
1319 * most of that can easily be done here instead.
1320 *
1321 * For the time being, just accept the values that were parsed earlier..
1322 */
1323 static void __init kgdb_console_get_options(struct uart_port *port, int *baud,
1324 int *parity, int *bits)
1325 {
1326 *baud = kgdb_baud;
1327 *parity = tolower(kgdb_parity);
1328 *bits = kgdb_bits - '0';
1329 }
1330
1331 /*
1332 * The naming here is somewhat misleading, since kgdb_console_setup() takes
1333 * care of the early-on initialization for kgdb, regardless of whether we
1334 * actually use kgdb as a console or not.
1335 *
1336 * On the plus side, this lets us kill off the old kgdb_sci_setup() nonsense.
1337 */
1338 int __init kgdb_console_setup(struct console *co, char *options)
1339 {
1340 struct uart_port *port = &sci_ports[kgdb_portnum].port;
1341 int baud = 38400;
1342 int bits = 8;
1343 int parity = 'n';
1344 int flow = 'n';
1345
1346 if (co->index != kgdb_portnum)
1347 co->index = kgdb_portnum;
1348
1349 kgdb_sci_port = &sci_ports[co->index];
1350 port = &kgdb_sci_port->port;
1351
1352 /*
1353 * Also need to check port->type, we don't actually have any
1354 * UPIO_PORT ports, but uart_report_port() handily misreports
1355 * it anyways if we don't have a port available by the time this is
1356 * called.
1357 */
1358 if (!port->type)
1359 return -ENODEV;
1360 if (!port->membase || !port->mapbase)
1361 return -ENODEV;
1362
1363 if (options)
1364 uart_parse_options(options, &baud, &parity, &bits, &flow);
1365 else
1366 kgdb_console_get_options(port, &baud, &parity, &bits);
1367
1368 kgdb_getchar = kgdb_sci_getchar;
1369 kgdb_putchar = kgdb_sci_putchar;
1370
1371 return uart_set_options(port, co, baud, parity, bits, flow);
1372 }
1373
1374 static struct console kgdb_console = {
1375 .name = "ttySC",
1376 .device = uart_console_device,
1377 .write = kgdb_console_write,
1378 .setup = kgdb_console_setup,
1379 .flags = CON_PRINTBUFFER,
1380 .index = -1,
1381 .data = &sci_uart_driver,
1382 };
1383
1384 /* Register the KGDB console so we get messages (d'oh!) */
1385 static int __init kgdb_console_init(void)
1386 {
1387 sci_init_ports();
1388 register_console(&kgdb_console);
1389 return 0;
1390 }
1391 console_initcall(kgdb_console_init);
1392 #endif /* CONFIG_SH_KGDB_CONSOLE */
1393
1394 #if defined(CONFIG_SH_KGDB_CONSOLE)
1395 #define SCI_CONSOLE &kgdb_console
1396 #elif defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
1397 #define SCI_CONSOLE &serial_console
1398 #else
1399 #define SCI_CONSOLE 0
1400 #endif
1401
1402 static char banner[] __initdata =
1403 KERN_INFO "SuperH SCI(F) driver initialized\n";
1404
1405 static struct uart_driver sci_uart_driver = {
1406 .owner = THIS_MODULE,
1407 .driver_name = "sci",
1408 .dev_name = "ttySC",
1409 .major = SCI_MAJOR,
1410 .minor = SCI_MINOR_START,
1411 .nr = SCI_NPORTS,
1412 .cons = SCI_CONSOLE,
1413 };
1414
1415 /*
1416 * Register a set of serial devices attached to a platform device. The
1417 * list is terminated with a zero flags entry, which means we expect
1418 * all entries to have at least UPF_BOOT_AUTOCONF set. Platforms that need
1419 * remapping (such as sh64) should also set UPF_IOREMAP.
1420 */
1421 static int __devinit sci_probe(struct platform_device *dev)
1422 {
1423 struct plat_sci_port *p = dev->dev.platform_data;
1424 int i;
1425
1426 for (i = 0; p && p->flags != 0; p++, i++) {
1427 struct sci_port *sciport = &sci_ports[i];
1428
1429 /* Sanity check */
1430 if (unlikely(i == SCI_NPORTS)) {
1431 dev_notice(&dev->dev, "Attempting to register port "
1432 "%d when only %d are available.\n",
1433 i+1, SCI_NPORTS);
1434 dev_notice(&dev->dev, "Consider bumping "
1435 "CONFIG_SERIAL_SH_SCI_NR_UARTS!\n");
1436 break;
1437 }
1438
1439 sciport->port.mapbase = p->mapbase;
1440
1441 /*
1442 * For the simple (and majority of) cases where we don't need
1443 * to do any remapping, just cast the cookie directly.
1444 */
1445 if (p->mapbase && !p->membase && !(p->flags & UPF_IOREMAP))
1446 p->membase = (void __iomem *)p->mapbase;
1447
1448 sciport->port.membase = p->membase;
1449
1450 sciport->port.irq = p->irqs[SCIx_TXI_IRQ];
1451 sciport->port.flags = p->flags;
1452 sciport->port.dev = &dev->dev;
1453
1454 sciport->type = sciport->port.type = p->type;
1455
1456 memcpy(&sciport->irqs, &p->irqs, sizeof(p->irqs));
1457
1458 uart_add_one_port(&sci_uart_driver, &sciport->port);
1459 }
1460
1461 #if defined(CONFIG_SH_KGDB) && !defined(CONFIG_SH_KGDB_CONSOLE)
1462 kgdb_sci_port = &sci_ports[kgdb_portnum];
1463 kgdb_getchar = kgdb_sci_getchar;
1464 kgdb_putchar = kgdb_sci_putchar;
1465 #endif
1466
1467 #ifdef CONFIG_CPU_FREQ
1468 cpufreq_register_notifier(&sci_nb, CPUFREQ_TRANSITION_NOTIFIER);
1469 dev_info(&dev->dev, "CPU frequency notifier registered\n");
1470 #endif
1471
1472 #ifdef CONFIG_SH_STANDARD_BIOS
1473 sh_bios_gdb_detach();
1474 #endif
1475
1476 return 0;
1477 }
1478
1479 static int __devexit sci_remove(struct platform_device *dev)
1480 {
1481 int i;
1482
1483 for (i = 0; i < SCI_NPORTS; i++)
1484 uart_remove_one_port(&sci_uart_driver, &sci_ports[i].port);
1485
1486 return 0;
1487 }
1488
1489 static int sci_suspend(struct platform_device *dev, pm_message_t state)
1490 {
1491 int i;
1492
1493 for (i = 0; i < SCI_NPORTS; i++) {
1494 struct sci_port *p = &sci_ports[i];
1495
1496 if (p->type != PORT_UNKNOWN && p->port.dev == &dev->dev)
1497 uart_suspend_port(&sci_uart_driver, &p->port);
1498 }
1499
1500 return 0;
1501 }
1502
1503 static int sci_resume(struct platform_device *dev)
1504 {
1505 int i;
1506
1507 for (i = 0; i < SCI_NPORTS; i++) {
1508 struct sci_port *p = &sci_ports[i];
1509
1510 if (p->type != PORT_UNKNOWN && p->port.dev == &dev->dev)
1511 uart_resume_port(&sci_uart_driver, &p->port);
1512 }
1513
1514 return 0;
1515 }
1516
1517 static struct platform_driver sci_driver = {
1518 .probe = sci_probe,
1519 .remove = __devexit_p(sci_remove),
1520 .suspend = sci_suspend,
1521 .resume = sci_resume,
1522 .driver = {
1523 .name = "sh-sci",
1524 .owner = THIS_MODULE,
1525 },
1526 };
1527
1528 static int __init sci_init(void)
1529 {
1530 int ret;
1531
1532 printk(banner);
1533
1534 sci_init_ports();
1535
1536 ret = uart_register_driver(&sci_uart_driver);
1537 if (likely(ret == 0)) {
1538 ret = platform_driver_register(&sci_driver);
1539 if (unlikely(ret))
1540 uart_unregister_driver(&sci_uart_driver);
1541 }
1542
1543 return ret;
1544 }
1545
1546 static void __exit sci_exit(void)
1547 {
1548 platform_driver_unregister(&sci_driver);
1549 uart_unregister_driver(&sci_uart_driver);
1550 }
1551
1552 module_init(sci_init);
1553 module_exit(sci_exit);
1554
1555 MODULE_LICENSE("GPL");
1556 MODULE_ALIAS("platform:sh-sci");
Support for the Chinese Samsung S3C2440 based development boards