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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / serial / sh-sci.c
blobeff593080d4fe8358886fd02e88672704d21bfa8
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
46 #ifdef CONFIG_CPU_FREQ
47 #include <linux/notifier.h>
48 #include <linux/cpufreq.h>
49 #endif
50
51 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
52 #include <linux/ctype.h>
53 #include <asm/clock.h>
54 #include <asm/sh_bios.h>
55 #include <asm/kgdb.h>
56 #endif
57
58 #include "sh-sci.h"
59
60 struct sci_port {
61 struct uart_port port;
62
63 /* Port type */
64 unsigned int type;
65
66 /* Port IRQs: ERI, RXI, TXI, BRI (optional) */
67 unsigned int irqs[SCIx_NR_IRQS];
68
69 /* Port pin configuration */
70 void (*init_pins)(struct uart_port *port,
71 unsigned int cflag);
72
73 /* Port enable callback */
74 void (*enable)(struct uart_port *port);
75
76 /* Port disable callback */
77 void (*disable)(struct uart_port *port);
78
79 /* Break timer */
80 struct timer_list break_timer;
81 int break_flag;
82
83 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
84 /* Port clock */
85 struct clk *clk;
86 #endif
87 };
88
89 #ifdef CONFIG_SH_KGDB
90 static struct sci_port *kgdb_sci_port;
91 #endif
92
93 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
94 static struct sci_port *serial_console_port;
95 #endif
96
97 /* Function prototypes */
98 static void sci_stop_tx(struct uart_port *port);
99
100 #define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS
101
102 static struct sci_port sci_ports[SCI_NPORTS];
103 static struct uart_driver sci_uart_driver;
104
105 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && \
106 defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
107 static inline void handle_error(struct uart_port *port)
108 {
109 /* Clear error flags */
110 sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
111 }
112
113 static int get_char(struct uart_port *port)
114 {
115 unsigned long flags;
116 unsigned short status;
117 int c;
118
119 spin_lock_irqsave(&port->lock, flags);
120 do {
121 status = sci_in(port, SCxSR);
122 if (status & SCxSR_ERRORS(port)) {
123 handle_error(port);
124 continue;
125 }
126 } while (!(status & SCxSR_RDxF(port)));
127 c = sci_in(port, SCxRDR);
128 sci_in(port, SCxSR); /* Dummy read */
129 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
130 spin_unlock_irqrestore(&port->lock, flags);
131
132 return c;
133 }
134 #endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
135
136 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) || defined(CONFIG_SH_KGDB)
137 static void put_char(struct uart_port *port, char c)
138 {
139 unsigned long flags;
140 unsigned short status;
141
142 spin_lock_irqsave(&port->lock, flags);
143
144 do {
145 status = sci_in(port, SCxSR);
146 } while (!(status & SCxSR_TDxE(port)));
147
148 sci_out(port, SCxTDR, c);
149 sci_in(port, SCxSR); /* Dummy read */
150 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
151
152 spin_unlock_irqrestore(&port->lock, flags);
153 }
154 #endif
155
156 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
157 static void put_string(struct sci_port *sci_port, const char *buffer, int count)
158 {
159 struct uart_port *port = &sci_port->port;
160 const unsigned char *p = buffer;
161 int i;
162
163 #if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
164 int checksum;
165 int usegdb=0;
166
167 #ifdef CONFIG_SH_STANDARD_BIOS
168 /* This call only does a trap the first time it is
169 * called, and so is safe to do here unconditionally
170 */
171 usegdb |= sh_bios_in_gdb_mode();
172 #endif
173 #ifdef CONFIG_SH_KGDB
174 usegdb |= (kgdb_in_gdb_mode && (sci_port == kgdb_sci_port));
175 #endif
176
177 if (usegdb) {
178 /* $<packet info>#<checksum>. */
179 do {
180 unsigned char c;
181 put_char(port, '$');
182 put_char(port, 'O'); /* 'O'utput to console */
183 checksum = 'O';
184
185 for (i=0; i<count; i++) { /* Don't use run length encoding */
186 int h, l;
187
188 c = *p++;
189 h = highhex(c);
190 l = lowhex(c);
191 put_char(port, h);
192 put_char(port, l);
193 checksum += h + l;
194 }
195 put_char(port, '#');
196 put_char(port, highhex(checksum));
197 put_char(port, lowhex(checksum));
198 } while (get_char(port) != '+');
199 } else
200 #endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
201 for (i=0; i<count; i++) {
202 if (*p == 10)
203 put_char(port, '\r');
204 put_char(port, *p++);
205 }
206 }
207 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
208
209 #ifdef CONFIG_SH_KGDB
210 static int kgdb_sci_getchar(void)
211 {
212 int c;
213
214 /* Keep trying to read a character, this could be neater */
215 while ((c = get_char(&kgdb_sci_port->port)) < 0)
216 cpu_relax();
217
218 return c;
219 }
220
221 static inline void kgdb_sci_putchar(int c)
222 {
223 put_char(&kgdb_sci_port->port, c);
224 }
225 #endif /* CONFIG_SH_KGDB */
226
227 #if defined(__H8300S__)
228 enum { sci_disable, sci_enable };
229
230 static void h8300_sci_config(struct uart_port* port, unsigned int ctrl)
231 {
232 volatile unsigned char *mstpcrl=(volatile unsigned char *)MSTPCRL;
233 int ch = (port->mapbase - SMR0) >> 3;
234 unsigned char mask = 1 << (ch+1);
235
236 if (ctrl == sci_disable) {
237 *mstpcrl |= mask;
238 } else {
239 *mstpcrl &= ~mask;
240 }
241 }
242
243 static inline void h8300_sci_enable(struct uart_port *port)
244 {
245 h8300_sci_config(port, sci_enable);
246 }
247
248 static inline void h8300_sci_disable(struct uart_port *port)
249 {
250 h8300_sci_config(port, sci_disable);
251 }
252 #endif
253
254 #if defined(SCI_ONLY) || defined(SCI_AND_SCIF) && \
255 defined(__H8300H__) || defined(__H8300S__)
256 static void sci_init_pins_sci(struct uart_port* port, unsigned int cflag)
257 {
258 int ch = (port->mapbase - SMR0) >> 3;
259
260 /* set DDR regs */
261 H8300_GPIO_DDR(h8300_sci_pins[ch].port,
262 h8300_sci_pins[ch].rx,
263 H8300_GPIO_INPUT);
264 H8300_GPIO_DDR(h8300_sci_pins[ch].port,
265 h8300_sci_pins[ch].tx,
266 H8300_GPIO_OUTPUT);
267
268 /* tx mark output*/
269 H8300_SCI_DR(ch) |= h8300_sci_pins[ch].tx;
270 }
271 #else
272 #define sci_init_pins_sci NULL
273 #endif
274
275 #if defined(CONFIG_CPU_SUBTYPE_SH7707) || defined(CONFIG_CPU_SUBTYPE_SH7709)
276 static void sci_init_pins_irda(struct uart_port *port, unsigned int cflag)
277 {
278 unsigned int fcr_val = 0;
279
280 if (cflag & CRTSCTS)
281 fcr_val |= SCFCR_MCE;
282
283 sci_out(port, SCFCR, fcr_val);
284 }
285 #else
286 #define sci_init_pins_irda NULL
287 #endif
288
289 #ifdef SCI_ONLY
290 #define sci_init_pins_scif NULL
291 #endif
292
293 #if defined(SCIF_ONLY) || defined(SCI_AND_SCIF)
294 #if defined(CONFIG_CPU_SUBTYPE_SH7710) || defined(CONFIG_CPU_SUBTYPE_SH7712)
295 static void sci_init_pins_scif(struct uart_port* port, unsigned int cflag)
296 {
297 unsigned int fcr_val = 0;
298
299 set_sh771x_scif_pfc(port);
300 if (cflag & CRTSCTS) {
301 fcr_val |= SCFCR_MCE;
302 }
303 sci_out(port, SCFCR, fcr_val);
304 }
305 #elif defined(CONFIG_CPU_SUBTYPE_SH7720) || defined(CONFIG_CPU_SUBTYPE_SH7721)
306 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
307 {
308 unsigned int fcr_val = 0;
309 unsigned short data;
310
311 if (cflag & CRTSCTS) {
312 /* enable RTS/CTS */
313 if (port->mapbase == 0xa4430000) { /* SCIF0 */
314 /* Clear PTCR bit 9-2; enable all scif pins but sck */
315 data = ctrl_inw(PORT_PTCR);
316 ctrl_outw((data & 0xfc03), PORT_PTCR);
317 } else if (port->mapbase == 0xa4438000) { /* SCIF1 */
318 /* Clear PVCR bit 9-2 */
319 data = ctrl_inw(PORT_PVCR);
320 ctrl_outw((data & 0xfc03), PORT_PVCR);
321 }
322 fcr_val |= SCFCR_MCE;
323 } else {
324 if (port->mapbase == 0xa4430000) { /* SCIF0 */
325 /* Clear PTCR bit 5-2; enable only tx and rx */
326 data = ctrl_inw(PORT_PTCR);
327 ctrl_outw((data & 0xffc3), PORT_PTCR);
328 } else if (port->mapbase == 0xa4438000) { /* SCIF1 */
329 /* Clear PVCR bit 5-2 */
330 data = ctrl_inw(PORT_PVCR);
331 ctrl_outw((data & 0xffc3), PORT_PVCR);
332 }
333 }
334 sci_out(port, SCFCR, fcr_val);
335 }
336
337 #elif defined(CONFIG_CPU_SH3)
338 /* For SH7705, SH7706, SH7707, SH7709, SH7709A, SH7729 */
339 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
340 {
341 unsigned int fcr_val = 0;
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 /* We need to set SCPCR to enable RTS/CTS */
353 data = ctrl_inw(SCPCR);
354 /* Clear out SCP7MD1,0, SCP4MD1,0,
355 Set SCP6MD1,0 = {01} (output) */
356 ctrl_outw((data & 0x0fcf) | 0x1000, SCPCR);
357
358 data = ctrl_inb(SCPDR);
359 /* Set /RTS2 (bit6) = 0 */
360 ctrl_outb(data & 0xbf, SCPDR);
361 }
362
363 sci_out(port, SCFCR, fcr_val);
364 }
365 #elif defined(CONFIG_CPU_SUBTYPE_SH7722)
366 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
367 {
368 unsigned int fcr_val = 0;
369
370 if (cflag & CRTSCTS) {
371 fcr_val |= SCFCR_MCE;
372
373 ctrl_outw(0x0000, PORT_PSCR);
374 } else {
375 unsigned short data;
376
377 data = ctrl_inw(PORT_PSCR);
378 data &= 0x033f;
379 data |= 0x0400;
380 ctrl_outw(data, PORT_PSCR);
381
382 ctrl_outw(ctrl_inw(SCSPTR0) & 0x17, SCSPTR0);
383 }
384
385 sci_out(port, SCFCR, fcr_val);
386 }
387 #else
388 /* For SH7750 */
389 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
390 {
391 unsigned int fcr_val = 0;
392
393 if (cflag & CRTSCTS) {
394 fcr_val |= SCFCR_MCE;
395 } else {
396 #if defined(CONFIG_CPU_SUBTYPE_SH7343) || defined(CONFIG_CPU_SUBTYPE_SH7366)
397 /* Nothing */
398 #elif defined(CONFIG_CPU_SUBTYPE_SH7763) || \
399 defined(CONFIG_CPU_SUBTYPE_SH7780) || \
400 defined(CONFIG_CPU_SUBTYPE_SH7785) || \
401 defined(CONFIG_CPU_SUBTYPE_SHX3)
402 ctrl_outw(0x0080, SCSPTR0); /* Set RTS = 1 */
403 #else
404 ctrl_outw(0x0080, SCSPTR2); /* Set RTS = 1 */
405 #endif
406 }
407 sci_out(port, SCFCR, fcr_val);
408 }
409 #endif
410
411 #if defined(CONFIG_CPU_SUBTYPE_SH7760) || \
412 defined(CONFIG_CPU_SUBTYPE_SH7763) || \
413 defined(CONFIG_CPU_SUBTYPE_SH7780) || \
414 defined(CONFIG_CPU_SUBTYPE_SH7785)
415 static inline int scif_txroom(struct uart_port *port)
416 {
417 return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0xff);
418 }
419
420 static inline int scif_rxroom(struct uart_port *port)
421 {
422 return sci_in(port, SCRFDR) & 0xff;
423 }
424 #else
425 static inline int scif_txroom(struct uart_port *port)
426 {
427 return SCIF_TXROOM_MAX - (sci_in(port, SCFDR) >> 8);
428 }
429
430 static inline int scif_rxroom(struct uart_port *port)
431 {
432 return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
433 }
434 #endif
435 #endif /* SCIF_ONLY || SCI_AND_SCIF */
436
437 static inline int sci_txroom(struct uart_port *port)
438 {
439 return ((sci_in(port, SCxSR) & SCI_TDRE) != 0);
440 }
441
442 static inline int sci_rxroom(struct uart_port *port)
443 {
444 return ((sci_in(port, SCxSR) & SCxSR_RDxF(port)) != 0);
445 }
446
447 /* ********************************************************************** *
448 * the interrupt related routines *
449 * ********************************************************************** */
450
451 static void sci_transmit_chars(struct uart_port *port)
452 {
453 struct circ_buf *xmit = &port->info->xmit;
454 unsigned int stopped = uart_tx_stopped(port);
455 unsigned short status;
456 unsigned short ctrl;
457 int count;
458
459 status = sci_in(port, SCxSR);
460 if (!(status & SCxSR_TDxE(port))) {
461 ctrl = sci_in(port, SCSCR);
462 if (uart_circ_empty(xmit)) {
463 ctrl &= ~SCI_CTRL_FLAGS_TIE;
464 } else {
465 ctrl |= SCI_CTRL_FLAGS_TIE;
466 }
467 sci_out(port, SCSCR, ctrl);
468 return;
469 }
470
471 #ifndef SCI_ONLY
472 if (port->type == PORT_SCIF)
473 count = scif_txroom(port);
474 else
475 #endif
476 count = sci_txroom(port);
477
478 do {
479 unsigned char c;
480
481 if (port->x_char) {
482 c = port->x_char;
483 port->x_char = 0;
484 } else if (!uart_circ_empty(xmit) && !stopped) {
485 c = xmit->buf[xmit->tail];
486 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
487 } else {
488 break;
489 }
490
491 sci_out(port, SCxTDR, c);
492
493 port->icount.tx++;
494 } while (--count > 0);
495
496 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
497
498 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
499 uart_write_wakeup(port);
500 if (uart_circ_empty(xmit)) {
501 sci_stop_tx(port);
502 } else {
503 ctrl = sci_in(port, SCSCR);
504
505 #if !defined(SCI_ONLY)
506 if (port->type == PORT_SCIF) {
507 sci_in(port, SCxSR); /* Dummy read */
508 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
509 }
510 #endif
511
512 ctrl |= SCI_CTRL_FLAGS_TIE;
513 sci_out(port, SCSCR, ctrl);
514 }
515 }
516
517 /* On SH3, SCIF may read end-of-break as a space->mark char */
518 #define STEPFN(c) ({int __c=(c); (((__c-1)|(__c)) == -1); })
519
520 static inline void sci_receive_chars(struct uart_port *port)
521 {
522 struct sci_port *sci_port = (struct sci_port *)port;
523 struct tty_struct *tty = port->info->tty;
524 int i, count, copied = 0;
525 unsigned short status;
526 unsigned char flag;
527
528 status = sci_in(port, SCxSR);
529 if (!(status & SCxSR_RDxF(port)))
530 return;
531
532 while (1) {
533 #if !defined(SCI_ONLY)
534 if (port->type == PORT_SCIF)
535 count = scif_rxroom(port);
536 else
537 #endif
538 count = sci_rxroom(port);
539
540 /* Don't copy more bytes than there is room for in the buffer */
541 count = tty_buffer_request_room(tty, count);
542
543 /* If for any reason we can't copy more data, we're done! */
544 if (count == 0)
545 break;
546
547 if (port->type == PORT_SCI) {
548 char c = sci_in(port, SCxRDR);
549 if (uart_handle_sysrq_char(port, c) || sci_port->break_flag)
550 count = 0;
551 else {
552 tty_insert_flip_char(tty, c, TTY_NORMAL);
553 }
554 } else {
555 for (i=0; i<count; i++) {
556 char c = sci_in(port, SCxRDR);
557 status = sci_in(port, SCxSR);
558 #if defined(CONFIG_CPU_SH3)
559 /* Skip "chars" during break */
560 if (sci_port->break_flag) {
561 if ((c == 0) &&
562 (status & SCxSR_FER(port))) {
563 count--; i--;
564 continue;
565 }
566
567 /* Nonzero => end-of-break */
568 pr_debug("scif: debounce<%02x>\n", c);
569 sci_port->break_flag = 0;
570
571 if (STEPFN(c)) {
572 count--; i--;
573 continue;
574 }
575 }
576 #endif /* CONFIG_CPU_SH3 */
577 if (uart_handle_sysrq_char(port, c)) {
578 count--; i--;
579 continue;
580 }
581
582 /* Store data and status */
583 if (status&SCxSR_FER(port)) {
584 flag = TTY_FRAME;
585 pr_debug("sci: frame error\n");
586 } else if (status&SCxSR_PER(port)) {
587 flag = TTY_PARITY;
588 pr_debug("sci: parity error\n");
589 } else
590 flag = TTY_NORMAL;
591 tty_insert_flip_char(tty, c, flag);
592 }
593 }
594
595 sci_in(port, SCxSR); /* dummy read */
596 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
597
598 copied += count;
599 port->icount.rx += count;
600 }
601
602 if (copied) {
603 /* Tell the rest of the system the news. New characters! */
604 tty_flip_buffer_push(tty);
605 } else {
606 sci_in(port, SCxSR); /* dummy read */
607 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
608 }
609 }
610
611 #define SCI_BREAK_JIFFIES (HZ/20)
612 /* The sci generates interrupts during the break,
613 * 1 per millisecond or so during the break period, for 9600 baud.
614 * So dont bother disabling interrupts.
615 * But dont want more than 1 break event.
616 * Use a kernel timer to periodically poll the rx line until
617 * the break is finished.
618 */
619 static void sci_schedule_break_timer(struct sci_port *port)
620 {
621 port->break_timer.expires = jiffies + SCI_BREAK_JIFFIES;
622 add_timer(&port->break_timer);
623 }
624 /* Ensure that two consecutive samples find the break over. */
625 static void sci_break_timer(unsigned long data)
626 {
627 struct sci_port *port = (struct sci_port *)data;
628
629 if (sci_rxd_in(&port->port) == 0) {
630 port->break_flag = 1;
631 sci_schedule_break_timer(port);
632 } else if (port->break_flag == 1) {
633 /* break is over. */
634 port->break_flag = 2;
635 sci_schedule_break_timer(port);
636 } else
637 port->break_flag = 0;
638 }
639
640 static inline int sci_handle_errors(struct uart_port *port)
641 {
642 int copied = 0;
643 unsigned short status = sci_in(port, SCxSR);
644 struct tty_struct *tty = port->info->tty;
645
646 if (status & SCxSR_ORER(port)) {
647 /* overrun error */
648 if (tty_insert_flip_char(tty, 0, TTY_OVERRUN))
649 copied++;
650 pr_debug("sci: overrun error\n");
651 }
652
653 if (status & SCxSR_FER(port)) {
654 if (sci_rxd_in(port) == 0) {
655 /* Notify of BREAK */
656 struct sci_port *sci_port = (struct sci_port *)port;
657
658 if (!sci_port->break_flag) {
659 sci_port->break_flag = 1;
660 sci_schedule_break_timer(sci_port);
661
662 /* Do sysrq handling. */
663 if (uart_handle_break(port))
664 return 0;
665 pr_debug("sci: BREAK detected\n");
666 if (tty_insert_flip_char(tty, 0, TTY_BREAK))
667 copied++;
668 }
669 } else {
670 /* frame error */
671 if (tty_insert_flip_char(tty, 0, TTY_FRAME))
672 copied++;
673 pr_debug("sci: frame error\n");
674 }
675 }
676
677 if (status & SCxSR_PER(port)) {
678 /* parity error */
679 if (tty_insert_flip_char(tty, 0, TTY_PARITY))
680 copied++;
681 pr_debug("sci: parity error\n");
682 }
683
684 if (copied)
685 tty_flip_buffer_push(tty);
686
687 return copied;
688 }
689
690 static inline int sci_handle_breaks(struct uart_port *port)
691 {
692 int copied = 0;
693 unsigned short status = sci_in(port, SCxSR);
694 struct tty_struct *tty = port->info->tty;
695 struct sci_port *s = &sci_ports[port->line];
696
697 if (uart_handle_break(port))
698 return 0;
699
700 if (!s->break_flag && status & SCxSR_BRK(port)) {
701 #if defined(CONFIG_CPU_SH3)
702 /* Debounce break */
703 s->break_flag = 1;
704 #endif
705 /* Notify of BREAK */
706 if (tty_insert_flip_char(tty, 0, TTY_BREAK))
707 copied++;
708 pr_debug("sci: BREAK detected\n");
709 }
710
711 #if defined(SCIF_ORER)
712 /* XXX: Handle SCIF overrun error */
713 if (port->type == PORT_SCIF && (sci_in(port, SCLSR) & SCIF_ORER) != 0) {
714 sci_out(port, SCLSR, 0);
715 if (tty_insert_flip_char(tty, 0, TTY_OVERRUN)) {
716 copied++;
717 pr_debug("sci: overrun error\n");
718 }
719 }
720 #endif
721
722 if (copied)
723 tty_flip_buffer_push(tty);
724
725 return copied;
726 }
727
728 static irqreturn_t sci_rx_interrupt(int irq, void *port)
729 {
730 /* I think sci_receive_chars has to be called irrespective
731 * of whether the I_IXOFF is set, otherwise, how is the interrupt
732 * to be disabled?
733 */
734 sci_receive_chars(port);
735
736 return IRQ_HANDLED;
737 }
738
739 static irqreturn_t sci_tx_interrupt(int irq, void *ptr)
740 {
741 struct uart_port *port = ptr;
742
743 spin_lock_irq(&port->lock);
744 sci_transmit_chars(port);
745 spin_unlock_irq(&port->lock);
746
747 return IRQ_HANDLED;
748 }
749
750 static irqreturn_t sci_er_interrupt(int irq, void *ptr)
751 {
752 struct uart_port *port = ptr;
753
754 /* Handle errors */
755 if (port->type == PORT_SCI) {
756 if (sci_handle_errors(port)) {
757 /* discard character in rx buffer */
758 sci_in(port, SCxSR);
759 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
760 }
761 } else {
762 #if defined(SCIF_ORER)
763 if((sci_in(port, SCLSR) & SCIF_ORER) != 0) {
764 struct tty_struct *tty = port->info->tty;
765
766 sci_out(port, SCLSR, 0);
767 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
768 tty_flip_buffer_push(tty);
769 pr_debug("scif: overrun error\n");
770 }
771 #endif
772 sci_rx_interrupt(irq, ptr);
773 }
774
775 sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
776
777 /* Kick the transmission */
778 sci_tx_interrupt(irq, ptr);
779
780 return IRQ_HANDLED;
781 }
782
783 static irqreturn_t sci_br_interrupt(int irq, void *ptr)
784 {
785 struct uart_port *port = ptr;
786
787 /* Handle BREAKs */
788 sci_handle_breaks(port);
789 sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port));
790
791 return IRQ_HANDLED;
792 }
793
794 static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
795 {
796 unsigned short ssr_status, scr_status;
797 struct uart_port *port = ptr;
798
799 ssr_status = sci_in(port,SCxSR);
800 scr_status = sci_in(port,SCSCR);
801
802 /* Tx Interrupt */
803 if ((ssr_status & 0x0020) && (scr_status & 0x0080))
804 sci_tx_interrupt(irq, ptr);
805 /* Rx Interrupt */
806 if ((ssr_status & 0x0002) && (scr_status & 0x0040))
807 sci_rx_interrupt(irq, ptr);
808 /* Error Interrupt */
809 if ((ssr_status & 0x0080) && (scr_status & 0x0400))
810 sci_er_interrupt(irq, ptr);
811 /* Break Interrupt */
812 if ((ssr_status & 0x0010) && (scr_status & 0x0200))
813 sci_br_interrupt(irq, ptr);
814
815 return IRQ_HANDLED;
816 }
817
818 #ifdef CONFIG_CPU_FREQ
819 /*
820 * Here we define a transistion notifier so that we can update all of our
821 * ports' baud rate when the peripheral clock changes.
822 */
823 static int sci_notifier(struct notifier_block *self,
824 unsigned long phase, void *p)
825 {
826 struct cpufreq_freqs *freqs = p;
827 int i;
828
829 if ((phase == CPUFREQ_POSTCHANGE) ||
830 (phase == CPUFREQ_RESUMECHANGE)){
831 for (i = 0; i < SCI_NPORTS; i++) {
832 struct uart_port *port = &sci_ports[i].port;
833 struct clk *clk;
834
835 /*
836 * Update the uartclk per-port if frequency has
837 * changed, since it will no longer necessarily be
838 * consistent with the old frequency.
839 *
840 * Really we want to be able to do something like
841 * uart_change_speed() or something along those lines
842 * here to implicitly reset the per-port baud rate..
843 *
844 * Clean this up later..
845 */
846 clk = clk_get(NULL, "module_clk");
847 port->uartclk = clk_get_rate(clk) * 16;
848 clk_put(clk);
849 }
850
851 printk(KERN_INFO "%s: got a postchange notification "
852 "for cpu %d (old %d, new %d)\n",
853 __FUNCTION__, freqs->cpu, freqs->old, freqs->new);
854 }
855
856 return NOTIFY_OK;
857 }
858
859 static struct notifier_block sci_nb = { &sci_notifier, NULL, 0 };
860 #endif /* CONFIG_CPU_FREQ */
861
862 static int sci_request_irq(struct sci_port *port)
863 {
864 int i;
865 irqreturn_t (*handlers[4])(int irq, void *ptr) = {
866 sci_er_interrupt, sci_rx_interrupt, sci_tx_interrupt,
867 sci_br_interrupt,
868 };
869 const char *desc[] = { "SCI Receive Error", "SCI Receive Data Full",
870 "SCI Transmit Data Empty", "SCI Break" };
871
872 if (port->irqs[0] == port->irqs[1]) {
873 if (!port->irqs[0]) {
874 printk(KERN_ERR "sci: Cannot allocate irq.(IRQ=0)\n");
875 return -ENODEV;
876 }
877
878 if (request_irq(port->irqs[0], sci_mpxed_interrupt,
879 IRQF_DISABLED, "sci", port)) {
880 printk(KERN_ERR "sci: Cannot allocate irq.\n");
881 return -ENODEV;
882 }
883 } else {
884 for (i = 0; i < ARRAY_SIZE(handlers); i++) {
885 if (!port->irqs[i])
886 continue;
887 if (request_irq(port->irqs[i], handlers[i],
888 IRQF_DISABLED, desc[i], port)) {
889 printk(KERN_ERR "sci: Cannot allocate irq.\n");
890 return -ENODEV;
891 }
892 }
893 }
894
895 return 0;
896 }
897
898 static void sci_free_irq(struct sci_port *port)
899 {
900 int i;
901
902 if (port->irqs[0] == port->irqs[1]) {
903 if (!port->irqs[0])
904 printk("sci: sci_free_irq error\n");
905 else
906 free_irq(port->irqs[0], port);
907 } else {
908 for (i = 0; i < ARRAY_SIZE(port->irqs); i++) {
909 if (!port->irqs[i])
910 continue;
911
912 free_irq(port->irqs[i], port);
913 }
914 }
915 }
916
917 static unsigned int sci_tx_empty(struct uart_port *port)
918 {
919 /* Can't detect */
920 return TIOCSER_TEMT;
921 }
922
923 static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl)
924 {
925 /* This routine is used for seting signals of: DTR, DCD, CTS/RTS */
926 /* We use SCIF's hardware for CTS/RTS, so don't need any for that. */
927 /* If you have signals for DTR and DCD, please implement here. */
928 }
929
930 static unsigned int sci_get_mctrl(struct uart_port *port)
931 {
932 /* This routine is used for geting signals of: DTR, DCD, DSR, RI,
933 and CTS/RTS */
934
935 return TIOCM_DTR | TIOCM_RTS | TIOCM_DSR;
936 }
937
938 static void sci_start_tx(struct uart_port *port)
939 {
940 unsigned short ctrl;
941
942 /* Set TIE (Transmit Interrupt Enable) bit in SCSCR */
943 ctrl = sci_in(port, SCSCR);
944 ctrl |= SCI_CTRL_FLAGS_TIE;
945 sci_out(port, SCSCR, ctrl);
946 }
947
948 static void sci_stop_tx(struct uart_port *port)
949 {
950 unsigned short ctrl;
951
952 /* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */
953 ctrl = sci_in(port, SCSCR);
954 ctrl &= ~SCI_CTRL_FLAGS_TIE;
955 sci_out(port, SCSCR, ctrl);
956 }
957
958 static void sci_start_rx(struct uart_port *port, unsigned int tty_start)
959 {
960 unsigned short ctrl;
961
962 /* Set RIE (Receive Interrupt Enable) bit in SCSCR */
963 ctrl = sci_in(port, SCSCR);
964 ctrl |= SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE;
965 sci_out(port, SCSCR, ctrl);
966 }
967
968 static void sci_stop_rx(struct uart_port *port)
969 {
970 unsigned short ctrl;
971
972 /* Clear RIE (Receive Interrupt Enable) bit in SCSCR */
973 ctrl = sci_in(port, SCSCR);
974 ctrl &= ~(SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE);
975 sci_out(port, SCSCR, ctrl);
976 }
977
978 static void sci_enable_ms(struct uart_port *port)
979 {
980 /* Nothing here yet .. */
981 }
982
983 static void sci_break_ctl(struct uart_port *port, int break_state)
984 {
985 /* Nothing here yet .. */
986 }
987
988 static int sci_startup(struct uart_port *port)
989 {
990 struct sci_port *s = &sci_ports[port->line];
991
992 if (s->enable)
993 s->enable(port);
994
995 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
996 s->clk = clk_get(NULL, "module_clk");
997 #endif
998
999 sci_request_irq(s);
1000 sci_start_tx(port);
1001 sci_start_rx(port, 1);
1002
1003 return 0;
1004 }
1005
1006 static void sci_shutdown(struct uart_port *port)
1007 {
1008 struct sci_port *s = &sci_ports[port->line];
1009
1010 sci_stop_rx(port);
1011 sci_stop_tx(port);
1012 sci_free_irq(s);
1013
1014 if (s->disable)
1015 s->disable(port);
1016
1017 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
1018 clk_put(s->clk);
1019 s->clk = NULL;
1020 #endif
1021 }
1022
1023 static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
1024 struct ktermios *old)
1025 {
1026 struct sci_port *s = &sci_ports[port->line];
1027 unsigned int status, baud, smr_val;
1028 int t;
1029
1030 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
1031
1032 switch (baud) {
1033 case 0:
1034 t = -1;
1035 break;
1036 default:
1037 {
1038 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
1039 t = SCBRR_VALUE(baud, clk_get_rate(s->clk));
1040 #else
1041 t = SCBRR_VALUE(baud);
1042 #endif
1043 break;
1044 }
1045 }
1046
1047 do {
1048 status = sci_in(port, SCxSR);
1049 } while (!(status & SCxSR_TEND(port)));
1050
1051 sci_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */
1052
1053 #if !defined(SCI_ONLY)
1054 if (port->type == PORT_SCIF)
1055 sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
1056 #endif
1057
1058 smr_val = sci_in(port, SCSMR) & 3;
1059 if ((termios->c_cflag & CSIZE) == CS7)
1060 smr_val |= 0x40;
1061 if (termios->c_cflag & PARENB)
1062 smr_val |= 0x20;
1063 if (termios->c_cflag & PARODD)
1064 smr_val |= 0x30;
1065 if (termios->c_cflag & CSTOPB)
1066 smr_val |= 0x08;
1067
1068 uart_update_timeout(port, termios->c_cflag, baud);
1069
1070 sci_out(port, SCSMR, smr_val);
1071
1072 if (t > 0) {
1073 if(t >= 256) {
1074 sci_out(port, SCSMR, (sci_in(port, SCSMR) & ~3) | 1);
1075 t >>= 2;
1076 } else {
1077 sci_out(port, SCSMR, sci_in(port, SCSMR) & ~3);
1078 }
1079 sci_out(port, SCBRR, t);
1080 udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
1081 }
1082
1083 if (likely(s->init_pins))
1084 s->init_pins(port, termios->c_cflag);
1085
1086 sci_out(port, SCSCR, SCSCR_INIT(port));
1087
1088 if ((termios->c_cflag & CREAD) != 0)
1089 sci_start_rx(port,0);
1090 }
1091
1092 static const char *sci_type(struct uart_port *port)
1093 {
1094 switch (port->type) {
1095 case PORT_SCI: return "sci";
1096 case PORT_SCIF: return "scif";
1097 case PORT_IRDA: return "irda";
1098 }
1099
1100 return 0;
1101 }
1102
1103 static void sci_release_port(struct uart_port *port)
1104 {
1105 /* Nothing here yet .. */
1106 }
1107
1108 static int sci_request_port(struct uart_port *port)
1109 {
1110 /* Nothing here yet .. */
1111 return 0;
1112 }
1113
1114 static void sci_config_port(struct uart_port *port, int flags)
1115 {
1116 struct sci_port *s = &sci_ports[port->line];
1117
1118 port->type = s->type;
1119
1120 switch (port->type) {
1121 case PORT_SCI:
1122 s->init_pins = sci_init_pins_sci;
1123 break;
1124 case PORT_SCIF:
1125 s->init_pins = sci_init_pins_scif;
1126 break;
1127 case PORT_IRDA:
1128 s->init_pins = sci_init_pins_irda;
1129 break;
1130 }
1131
1132 #if defined(CONFIG_CPU_SUBTYPE_SH5_101) || defined(CONFIG_CPU_SUBTYPE_SH5_103)
1133 if (port->mapbase == 0)
1134 port->mapbase = onchip_remap(SCIF_ADDR_SH5, 1024, "SCIF");
1135
1136 port->membase = (void __iomem *)port->mapbase;
1137 #endif
1138 }
1139
1140 static int sci_verify_port(struct uart_port *port, struct serial_struct *ser)
1141 {
1142 struct sci_port *s = &sci_ports[port->line];
1143
1144 if (ser->irq != s->irqs[SCIx_TXI_IRQ] || ser->irq > NR_IRQS)
1145 return -EINVAL;
1146 if (ser->baud_base < 2400)
1147 /* No paper tape reader for Mitch.. */
1148 return -EINVAL;
1149
1150 return 0;
1151 }
1152
1153 static struct uart_ops sci_uart_ops = {
1154 .tx_empty = sci_tx_empty,
1155 .set_mctrl = sci_set_mctrl,
1156 .get_mctrl = sci_get_mctrl,
1157 .start_tx = sci_start_tx,
1158 .stop_tx = sci_stop_tx,
1159 .stop_rx = sci_stop_rx,
1160 .enable_ms = sci_enable_ms,
1161 .break_ctl = sci_break_ctl,
1162 .startup = sci_startup,
1163 .shutdown = sci_shutdown,
1164 .set_termios = sci_set_termios,
1165 .type = sci_type,
1166 .release_port = sci_release_port,
1167 .request_port = sci_request_port,
1168 .config_port = sci_config_port,
1169 .verify_port = sci_verify_port,
1170 };
1171
1172 static void __init sci_init_ports(void)
1173 {
1174 static int first = 1;
1175 int i;
1176
1177 if (!first)
1178 return;
1179
1180 first = 0;
1181
1182 for (i = 0; i < SCI_NPORTS; i++) {
1183 sci_ports[i].port.ops = &sci_uart_ops;
1184 sci_ports[i].port.iotype = UPIO_MEM;
1185 sci_ports[i].port.line = i;
1186 sci_ports[i].port.fifosize = 1;
1187
1188 #if defined(__H8300H__) || defined(__H8300S__)
1189 #ifdef __H8300S__
1190 sci_ports[i].enable = h8300_sci_enable;
1191 sci_ports[i].disable = h8300_sci_disable;
1192 #endif
1193 sci_ports[i].port.uartclk = CONFIG_CPU_CLOCK;
1194 #elif defined(CONFIG_SUPERH64)
1195 sci_ports[i].port.uartclk = current_cpu_data.module_clock * 16;
1196 #else
1197 /*
1198 * XXX: We should use a proper SCI/SCIF clock
1199 */
1200 {
1201 struct clk *clk = clk_get(NULL, "module_clk");
1202 sci_ports[i].port.uartclk = clk_get_rate(clk) * 16;
1203 clk_put(clk);
1204 }
1205 #endif
1206
1207 sci_ports[i].break_timer.data = (unsigned long)&sci_ports[i];
1208 sci_ports[i].break_timer.function = sci_break_timer;
1209
1210 init_timer(&sci_ports[i].break_timer);
1211 }
1212 }
1213
1214 int __init early_sci_setup(struct uart_port *port)
1215 {
1216 if (unlikely(port->line > SCI_NPORTS))
1217 return -ENODEV;
1218
1219 sci_init_ports();
1220
1221 sci_ports[port->line].port.membase = port->membase;
1222 sci_ports[port->line].port.mapbase = port->mapbase;
1223 sci_ports[port->line].port.type = port->type;
1224
1225 return 0;
1226 }
1227
1228 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
1229 /*
1230 * Print a string to the serial port trying not to disturb
1231 * any possible real use of the port...
1232 */
1233 static void serial_console_write(struct console *co, const char *s,
1234 unsigned count)
1235 {
1236 put_string(serial_console_port, s, count);
1237 }
1238
1239 static int __init serial_console_setup(struct console *co, char *options)
1240 {
1241 struct uart_port *port;
1242 int baud = 115200;
1243 int bits = 8;
1244 int parity = 'n';
1245 int flow = 'n';
1246 int ret;
1247
1248 /*
1249 * Check whether an invalid uart number has been specified, and
1250 * if so, search for the first available port that does have
1251 * console support.
1252 */
1253 if (co->index >= SCI_NPORTS)
1254 co->index = 0;
1255
1256 serial_console_port = &sci_ports[co->index];
1257 port = &serial_console_port->port;
1258
1259 /*
1260 * Also need to check port->type, we don't actually have any
1261 * UPIO_PORT ports, but uart_report_port() handily misreports
1262 * it anyways if we don't have a port available by the time this is
1263 * called.
1264 */
1265 if (!port->type)
1266 return -ENODEV;
1267 if (!port->membase || !port->mapbase)
1268 return -ENODEV;
1269
1270 port->type = serial_console_port->type;
1271
1272 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
1273 if (!serial_console_port->clk)
1274 serial_console_port->clk = clk_get(NULL, "module_clk");
1275 #endif
1276
1277 if (port->flags & UPF_IOREMAP)
1278 sci_config_port(port, 0);
1279
1280 if (serial_console_port->enable)
1281 serial_console_port->enable(port);
1282
1283 if (options)
1284 uart_parse_options(options, &baud, &parity, &bits, &flow);
1285
1286 ret = uart_set_options(port, co, baud, parity, bits, flow);
1287 #if defined(__H8300H__) || defined(__H8300S__)
1288 /* disable rx interrupt */
1289 if (ret == 0)
1290 sci_stop_rx(port);
1291 #endif
1292 return ret;
1293 }
1294
1295 static struct console serial_console = {
1296 .name = "ttySC",
1297 .device = uart_console_device,
1298 .write = serial_console_write,
1299 .setup = serial_console_setup,
1300 .flags = CON_PRINTBUFFER,
1301 .index = -1,
1302 .data = &sci_uart_driver,
1303 };
1304
1305 static int __init sci_console_init(void)
1306 {
1307 sci_init_ports();
1308 register_console(&serial_console);
1309 return 0;
1310 }
1311 console_initcall(sci_console_init);
1312 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
1313
1314 #ifdef CONFIG_SH_KGDB_CONSOLE
1315 /*
1316 * FIXME: Most of this can go away.. at the moment, we rely on
1317 * arch/sh/kernel/setup.c to do the command line parsing for kgdb, though
1318 * most of that can easily be done here instead.
1319 *
1320 * For the time being, just accept the values that were parsed earlier..
1321 */
1322 static void __init kgdb_console_get_options(struct uart_port *port, int *baud,
1323 int *parity, int *bits)
1324 {
1325 *baud = kgdb_baud;
1326 *parity = tolower(kgdb_parity);
1327 *bits = kgdb_bits - '0';
1328 }
1329
1330 /*
1331 * The naming here is somewhat misleading, since kgdb_console_setup() takes
1332 * care of the early-on initialization for kgdb, regardless of whether we
1333 * actually use kgdb as a console or not.
1334 *
1335 * On the plus side, this lets us kill off the old kgdb_sci_setup() nonsense.
1336 */
1337 int __init kgdb_console_setup(struct console *co, char *options)
1338 {
1339 struct uart_port *port = &sci_ports[kgdb_portnum].port;
1340 int baud = 38400;
1341 int bits = 8;
1342 int parity = 'n';
1343 int flow = 'n';
1344
1345 if (co->index != kgdb_portnum)
1346 co->index = kgdb_portnum;
1347
1348 kgdb_sci_port = &sci_ports[co->index];
1349 port = &kgdb_sci_port->port;
1350
1351 /*
1352 * Also need to check port->type, we don't actually have any
1353 * UPIO_PORT ports, but uart_report_port() handily misreports
1354 * it anyways if we don't have a port available by the time this is
1355 * called.
1356 */
1357 if (!port->type)
1358 return -ENODEV;
1359 if (!port->membase || !port->mapbase)
1360 return -ENODEV;
1361
1362 if (options)
1363 uart_parse_options(options, &baud, &parity, &bits, &flow);
1364 else
1365 kgdb_console_get_options(port, &baud, &parity, &bits);
1366
1367 kgdb_getchar = kgdb_sci_getchar;
1368 kgdb_putchar = kgdb_sci_putchar;
1369
1370 return uart_set_options(port, co, baud, parity, bits, flow);
1371 }
1372
1373 static struct console kgdb_console = {
1374 .name = "ttySC",
1375 .device = uart_console_device,
1376 .write = kgdb_console_write,
1377 .setup = kgdb_console_setup,
1378 .flags = CON_PRINTBUFFER,
1379 .index = -1,
1380 .data = &sci_uart_driver,
1381 };
1382
1383 /* Register the KGDB console so we get messages (d'oh!) */
1384 static int __init kgdb_console_init(void)
1385 {
1386 sci_init_ports();
1387 register_console(&kgdb_console);
1388 return 0;
1389 }
1390 console_initcall(kgdb_console_init);
1391 #endif /* CONFIG_SH_KGDB_CONSOLE */
1392
1393 #if defined(CONFIG_SH_KGDB_CONSOLE)
1394 #define SCI_CONSOLE &kgdb_console
1395 #elif defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
1396 #define SCI_CONSOLE &serial_console
1397 #else
1398 #define SCI_CONSOLE 0
1399 #endif
1400
1401 static char banner[] __initdata =
1402 KERN_INFO "SuperH SCI(F) driver initialized\n";
1403
1404 static struct uart_driver sci_uart_driver = {
1405 .owner = THIS_MODULE,
1406 .driver_name = "sci",
1407 .dev_name = "ttySC",
1408 .major = SCI_MAJOR,
1409 .minor = SCI_MINOR_START,
1410 .nr = SCI_NPORTS,
1411 .cons = SCI_CONSOLE,
1412 };
1413
1414 /*
1415 * Register a set of serial devices attached to a platform device. The
1416 * list is terminated with a zero flags entry, which means we expect
1417 * all entries to have at least UPF_BOOT_AUTOCONF set. Platforms that need
1418 * remapping (such as sh64) should also set UPF_IOREMAP.
1419 */
1420 static int __devinit sci_probe(struct platform_device *dev)
1421 {
1422 struct plat_sci_port *p = dev->dev.platform_data;
1423 int i;
1424
1425 for (i = 0; p && p->flags != 0; p++, i++) {
1426 struct sci_port *sciport = &sci_ports[i];
1427
1428 /* Sanity check */
1429 if (unlikely(i == SCI_NPORTS)) {
1430 dev_notice(&dev->dev, "Attempting to register port "
1431 "%d when only %d are available.\n",
1432 i+1, SCI_NPORTS);
1433 dev_notice(&dev->dev, "Consider bumping "
1434 "CONFIG_SERIAL_SH_SCI_NR_UARTS!\n");
1435 break;
1436 }
1437
1438 sciport->port.mapbase = p->mapbase;
1439
1440 /*
1441 * For the simple (and majority of) cases where we don't need
1442 * to do any remapping, just cast the cookie directly.
1443 */
1444 if (p->mapbase && !p->membase && !(p->flags & UPF_IOREMAP))
1445 p->membase = (void __iomem *)p->mapbase;
1446
1447 sciport->port.membase = p->membase;
1448
1449 sciport->port.irq = p->irqs[SCIx_TXI_IRQ];
1450 sciport->port.flags = p->flags;
1451 sciport->port.dev = &dev->dev;
1452
1453 sciport->type = sciport->port.type = p->type;
1454
1455 memcpy(&sciport->irqs, &p->irqs, sizeof(p->irqs));
1456
1457 uart_add_one_port(&sci_uart_driver, &sciport->port);
1458 }
1459
1460 #if defined(CONFIG_SH_KGDB) && !defined(CONFIG_SH_KGDB_CONSOLE)
1461 kgdb_sci_port = &sci_ports[kgdb_portnum];
1462 kgdb_getchar = kgdb_sci_getchar;
1463 kgdb_putchar = kgdb_sci_putchar;
1464 #endif
1465
1466 #ifdef CONFIG_CPU_FREQ
1467 cpufreq_register_notifier(&sci_nb, CPUFREQ_TRANSITION_NOTIFIER);
1468 dev_info(&dev->dev, "CPU frequency notifier registered\n");
1469 #endif
1470
1471 #ifdef CONFIG_SH_STANDARD_BIOS
1472 sh_bios_gdb_detach();
1473 #endif
1474
1475 return 0;
1476 }
1477
1478 static int __devexit sci_remove(struct platform_device *dev)
1479 {
1480 int i;
1481
1482 for (i = 0; i < SCI_NPORTS; i++)
1483 uart_remove_one_port(&sci_uart_driver, &sci_ports[i].port);
1484
1485 return 0;
1486 }
1487
1488 static int sci_suspend(struct platform_device *dev, pm_message_t state)
1489 {
1490 int i;
1491
1492 for (i = 0; i < SCI_NPORTS; i++) {
1493 struct sci_port *p = &sci_ports[i];
1494
1495 if (p->type != PORT_UNKNOWN && p->port.dev == &dev->dev)
1496 uart_suspend_port(&sci_uart_driver, &p->port);
1497 }
1498
1499 return 0;
1500 }
1501
1502 static int sci_resume(struct platform_device *dev)
1503 {
1504 int i;
1505
1506 for (i = 0; i < SCI_NPORTS; i++) {
1507 struct sci_port *p = &sci_ports[i];
1508
1509 if (p->type != PORT_UNKNOWN && p->port.dev == &dev->dev)
1510 uart_resume_port(&sci_uart_driver, &p->port);
1511 }
1512
1513 return 0;
1514 }
1515
1516 static struct platform_driver sci_driver = {
1517 .probe = sci_probe,
1518 .remove = __devexit_p(sci_remove),
1519 .suspend = sci_suspend,
1520 .resume = sci_resume,
1521 .driver = {
1522 .name = "sh-sci",
1523 .owner = THIS_MODULE,
1524 },
1525 };
1526
1527 static int __init sci_init(void)
1528 {
1529 int ret;
1530
1531 printk(banner);
1532
1533 sci_init_ports();
1534
1535 ret = uart_register_driver(&sci_uart_driver);
1536 if (likely(ret == 0)) {
1537 ret = platform_driver_register(&sci_driver);
1538 if (unlikely(ret))
1539 uart_unregister_driver(&sci_uart_driver);
1540 }
1541
1542 return ret;
1543 }
1544
1545 static void __exit sci_exit(void)
1546 {
1547 platform_driver_unregister(&sci_driver);
1548 uart_unregister_driver(&sci_uart_driver);
1549 }
1550
1551 module_init(sci_init);
1552 module_exit(sci_exit);
1553
1554 MODULE_LICENSE("GPL");
1555 MODULE_ALIAS("platform:sh-sci");
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