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sh: sh-rtc carry interrupt rework
[linux-2.6/mini2440.git] / drivers / rtc / rtc-sh.c
blob21e7435daecb16cb80f5c74cbbb64fd430cf6b01
1 /*
2 * SuperH On-Chip RTC Support
3 *
4 * Copyright (C) 2006, 2007, 2008 Paul Mundt
5 * Copyright (C) 2006 Jamie Lenehan
6 * Copyright (C) 2008 Angelo Castello
7 *
8 * Based on the old arch/sh/kernel/cpu/rtc.c by:
9 *
10 * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
11 * Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka
12 *
13 * This file is subject to the terms and conditions of the GNU General Public
14 * License. See the file "COPYING" in the main directory of this archive
15 * for more details.
16 */
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/bcd.h>
20 #include <linux/rtc.h>
21 #include <linux/init.h>
22 #include <linux/platform_device.h>
23 #include <linux/seq_file.h>
24 #include <linux/interrupt.h>
25 #include <linux/spinlock.h>
26 #include <linux/io.h>
27 #include <linux/log2.h>
28 #include <asm/rtc.h>
29
30 #define DRV_NAME "sh-rtc"
31 #define DRV_VERSION "0.2.1"
32
33 #define RTC_REG(r) ((r) * rtc_reg_size)
34
35 #define R64CNT RTC_REG(0)
36
37 #define RSECCNT RTC_REG(1) /* RTC sec */
38 #define RMINCNT RTC_REG(2) /* RTC min */
39 #define RHRCNT RTC_REG(3) /* RTC hour */
40 #define RWKCNT RTC_REG(4) /* RTC week */
41 #define RDAYCNT RTC_REG(5) /* RTC day */
42 #define RMONCNT RTC_REG(6) /* RTC month */
43 #define RYRCNT RTC_REG(7) /* RTC year */
44 #define RSECAR RTC_REG(8) /* ALARM sec */
45 #define RMINAR RTC_REG(9) /* ALARM min */
46 #define RHRAR RTC_REG(10) /* ALARM hour */
47 #define RWKAR RTC_REG(11) /* ALARM week */
48 #define RDAYAR RTC_REG(12) /* ALARM day */
49 #define RMONAR RTC_REG(13) /* ALARM month */
50 #define RCR1 RTC_REG(14) /* Control */
51 #define RCR2 RTC_REG(15) /* Control */
52
53 /*
54 * Note on RYRAR and RCR3: Up until this point most of the register
55 * definitions are consistent across all of the available parts. However,
56 * the placement of the optional RYRAR and RCR3 (the RYRAR control
57 * register used to control RYRCNT/RYRAR compare) varies considerably
58 * across various parts, occasionally being mapped in to a completely
59 * unrelated address space. For proper RYRAR support a separate resource
60 * would have to be handed off, but as this is purely optional in
61 * practice, we simply opt not to support it, thereby keeping the code
62 * quite a bit more simplified.
63 */
64
65 /* ALARM Bits - or with BCD encoded value */
66 #define AR_ENB 0x80 /* Enable for alarm cmp */
67
68 /* Period Bits */
69 #define PF_HP 0x100 /* Enable Half Period to support 8,32,128Hz */
70 #define PF_COUNT 0x200 /* Half periodic counter */
71 #define PF_OXS 0x400 /* Periodic One x Second */
72 #define PF_KOU 0x800 /* Kernel or User periodic request 1=kernel */
73 #define PF_MASK 0xf00
74
75 /* RCR1 Bits */
76 #define RCR1_CF 0x80 /* Carry Flag */
77 #define RCR1_CIE 0x10 /* Carry Interrupt Enable */
78 #define RCR1_AIE 0x08 /* Alarm Interrupt Enable */
79 #define RCR1_AF 0x01 /* Alarm Flag */
80
81 /* RCR2 Bits */
82 #define RCR2_PEF 0x80 /* PEriodic interrupt Flag */
83 #define RCR2_PESMASK 0x70 /* Periodic interrupt Set */
84 #define RCR2_RTCEN 0x08 /* ENable RTC */
85 #define RCR2_ADJ 0x04 /* ADJustment (30-second) */
86 #define RCR2_RESET 0x02 /* Reset bit */
87 #define RCR2_START 0x01 /* Start bit */
88
89 struct sh_rtc {
90 void __iomem *regbase;
91 unsigned long regsize;
92 struct resource *res;
93 int alarm_irq;
94 int periodic_irq;
95 int carry_irq;
96 struct rtc_device *rtc_dev;
97 spinlock_t lock;
98 unsigned long capabilities; /* See asm-sh/rtc.h for cap bits */
99 unsigned short periodic_freq;
100 };
101
102 static int __sh_rtc_interrupt(struct sh_rtc *rtc)
103 {
104 unsigned int tmp, pending;
105
106 tmp = readb(rtc->regbase + RCR1);
107 pending = tmp & RCR1_CF;
108 tmp &= ~RCR1_CF;
109 writeb(tmp, rtc->regbase + RCR1);
110
111 /* Users have requested One x Second IRQ */
112 if (pending && rtc->periodic_freq & PF_OXS)
113 rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
114
115 return pending;
116 }
117
118 static int __sh_rtc_alarm(struct sh_rtc *rtc)
119 {
120 unsigned int tmp, pending;
121
122 tmp = readb(rtc->regbase + RCR1);
123 pending = tmp & RCR1_AF;
124 tmp &= ~(RCR1_AF | RCR1_AIE);
125 writeb(tmp, rtc->regbase + RCR1);
126
127 if (pending)
128 rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
129
130 return pending;
131 }
132
133 static int __sh_rtc_periodic(struct sh_rtc *rtc)
134 {
135 struct rtc_device *rtc_dev = rtc->rtc_dev;
136 struct rtc_task *irq_task;
137 unsigned int tmp, pending;
138
139 tmp = readb(rtc->regbase + RCR2);
140 pending = tmp & RCR2_PEF;
141 tmp &= ~RCR2_PEF;
142 writeb(tmp, rtc->regbase + RCR2);
143
144 if (!pending)
145 return 0;
146
147 /* Half period enabled than one skipped and the next notified */
148 if ((rtc->periodic_freq & PF_HP) && (rtc->periodic_freq & PF_COUNT))
149 rtc->periodic_freq &= ~PF_COUNT;
150 else {
151 if (rtc->periodic_freq & PF_HP)
152 rtc->periodic_freq |= PF_COUNT;
153 if (rtc->periodic_freq & PF_KOU) {
154 spin_lock(&rtc_dev->irq_task_lock);
155 irq_task = rtc_dev->irq_task;
156 if (irq_task)
157 irq_task->func(irq_task->private_data);
158 spin_unlock(&rtc_dev->irq_task_lock);
159 } else
160 rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
161 }
162
163 return pending;
164 }
165
166 static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
167 {
168 struct sh_rtc *rtc = dev_id;
169 int ret;
170
171 spin_lock(&rtc->lock);
172 ret = __sh_rtc_interrupt(rtc);
173 spin_unlock(&rtc->lock);
174
175 return IRQ_RETVAL(ret);
176 }
177
178 static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
179 {
180 struct sh_rtc *rtc = dev_id;
181 int ret;
182
183 spin_lock(&rtc->lock);
184 ret = __sh_rtc_alarm(rtc);
185 spin_unlock(&rtc->lock);
186
187 return IRQ_RETVAL(ret);
188 }
189
190 static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
191 {
192 struct sh_rtc *rtc = dev_id;
193 int ret;
194
195 spin_lock(&rtc->lock);
196 ret = __sh_rtc_periodic(rtc);
197 spin_unlock(&rtc->lock);
198
199 return IRQ_RETVAL(ret);
200 }
201
202 static irqreturn_t sh_rtc_shared(int irq, void *dev_id)
203 {
204 struct sh_rtc *rtc = dev_id;
205 int ret;
206
207 spin_lock(&rtc->lock);
208 ret = __sh_rtc_interrupt(rtc);
209 ret |= __sh_rtc_alarm(rtc);
210 ret |= __sh_rtc_periodic(rtc);
211 spin_unlock(&rtc->lock);
212
213 return IRQ_RETVAL(ret);
214 }
215
216 static inline void sh_rtc_setpie(struct device *dev, unsigned int enable)
217 {
218 struct sh_rtc *rtc = dev_get_drvdata(dev);
219 unsigned int tmp;
220
221 spin_lock_irq(&rtc->lock);
222
223 tmp = readb(rtc->regbase + RCR2);
224
225 if (enable) {
226 tmp &= ~RCR2_PEF; /* Clear PES bit */
227 tmp |= (rtc->periodic_freq & ~PF_HP); /* Set PES2-0 */
228 } else
229 tmp &= ~(RCR2_PESMASK | RCR2_PEF);
230
231 writeb(tmp, rtc->regbase + RCR2);
232
233 spin_unlock_irq(&rtc->lock);
234 }
235
236 static inline int sh_rtc_setfreq(struct device *dev, unsigned int freq)
237 {
238 struct sh_rtc *rtc = dev_get_drvdata(dev);
239 int tmp, ret = 0;
240
241 spin_lock_irq(&rtc->lock);
242 tmp = rtc->periodic_freq & PF_MASK;
243
244 switch (freq) {
245 case 0:
246 rtc->periodic_freq = 0x00;
247 break;
248 case 1:
249 rtc->periodic_freq = 0x60;
250 break;
251 case 2:
252 rtc->periodic_freq = 0x50;
253 break;
254 case 4:
255 rtc->periodic_freq = 0x40;
256 break;
257 case 8:
258 rtc->periodic_freq = 0x30 | PF_HP;
259 break;
260 case 16:
261 rtc->periodic_freq = 0x30;
262 break;
263 case 32:
264 rtc->periodic_freq = 0x20 | PF_HP;
265 break;
266 case 64:
267 rtc->periodic_freq = 0x20;
268 break;
269 case 128:
270 rtc->periodic_freq = 0x10 | PF_HP;
271 break;
272 case 256:
273 rtc->periodic_freq = 0x10;
274 break;
275 default:
276 ret = -ENOTSUPP;
277 }
278
279 if (ret == 0) {
280 rtc->periodic_freq |= tmp;
281 rtc->rtc_dev->irq_freq = freq;
282 }
283
284 spin_unlock_irq(&rtc->lock);
285 return ret;
286 }
287
288 static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
289 {
290 struct sh_rtc *rtc = dev_get_drvdata(dev);
291 unsigned int tmp;
292
293 spin_lock_irq(&rtc->lock);
294
295 tmp = readb(rtc->regbase + RCR1);
296
297 if (!enable)
298 tmp &= ~RCR1_AIE;
299 else
300 tmp |= RCR1_AIE;
301
302 writeb(tmp, rtc->regbase + RCR1);
303
304 spin_unlock_irq(&rtc->lock);
305 }
306
307 static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
308 {
309 struct sh_rtc *rtc = dev_get_drvdata(dev);
310 unsigned int tmp;
311
312 tmp = readb(rtc->regbase + RCR1);
313 seq_printf(seq, "carry_IRQ\t: %s\n", (tmp & RCR1_CIE) ? "yes" : "no");
314
315 tmp = readb(rtc->regbase + RCR2);
316 seq_printf(seq, "periodic_IRQ\t: %s\n",
317 (tmp & RCR2_PESMASK) ? "yes" : "no");
318
319 return 0;
320 }
321
322 static inline void sh_rtc_setcie(struct device *dev, unsigned int enable)
323 {
324 struct sh_rtc *rtc = dev_get_drvdata(dev);
325 unsigned int tmp;
326
327 spin_lock_irq(&rtc->lock);
328
329 tmp = readb(rtc->regbase + RCR1);
330
331 if (!enable)
332 tmp &= ~RCR1_CIE;
333 else
334 tmp |= RCR1_CIE;
335
336 writeb(tmp, rtc->regbase + RCR1);
337
338 spin_unlock_irq(&rtc->lock);
339 }
340
341 static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
342 {
343 struct sh_rtc *rtc = dev_get_drvdata(dev);
344 unsigned int ret = 0;
345
346 switch (cmd) {
347 case RTC_PIE_OFF:
348 case RTC_PIE_ON:
349 sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
350 break;
351 case RTC_AIE_OFF:
352 case RTC_AIE_ON:
353 sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
354 break;
355 case RTC_UIE_OFF:
356 rtc->periodic_freq &= ~PF_OXS;
357 sh_rtc_setcie(dev, 0);
358 break;
359 case RTC_UIE_ON:
360 rtc->periodic_freq |= PF_OXS;
361 sh_rtc_setcie(dev, 1);
362 break;
363 case RTC_IRQP_READ:
364 ret = put_user(rtc->rtc_dev->irq_freq,
365 (unsigned long __user *)arg);
366 break;
367 case RTC_IRQP_SET:
368 ret = sh_rtc_setfreq(dev, arg);
369 break;
370 default:
371 ret = -ENOIOCTLCMD;
372 }
373
374 return ret;
375 }
376
377 static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
378 {
379 struct platform_device *pdev = to_platform_device(dev);
380 struct sh_rtc *rtc = platform_get_drvdata(pdev);
381 unsigned int sec128, sec2, yr, yr100, cf_bit;
382
383 do {
384 unsigned int tmp;
385
386 spin_lock_irq(&rtc->lock);
387
388 tmp = readb(rtc->regbase + RCR1);
389 tmp &= ~RCR1_CF; /* Clear CF-bit */
390 tmp |= RCR1_CIE;
391 writeb(tmp, rtc->regbase + RCR1);
392
393 sec128 = readb(rtc->regbase + R64CNT);
394
395 tm->tm_sec = bcd2bin(readb(rtc->regbase + RSECCNT));
396 tm->tm_min = bcd2bin(readb(rtc->regbase + RMINCNT));
397 tm->tm_hour = bcd2bin(readb(rtc->regbase + RHRCNT));
398 tm->tm_wday = bcd2bin(readb(rtc->regbase + RWKCNT));
399 tm->tm_mday = bcd2bin(readb(rtc->regbase + RDAYCNT));
400 tm->tm_mon = bcd2bin(readb(rtc->regbase + RMONCNT)) - 1;
401
402 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
403 yr = readw(rtc->regbase + RYRCNT);
404 yr100 = bcd2bin(yr >> 8);
405 yr &= 0xff;
406 } else {
407 yr = readb(rtc->regbase + RYRCNT);
408 yr100 = bcd2bin((yr == 0x99) ? 0x19 : 0x20);
409 }
410
411 tm->tm_year = (yr100 * 100 + bcd2bin(yr)) - 1900;
412
413 sec2 = readb(rtc->regbase + R64CNT);
414 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
415
416 spin_unlock_irq(&rtc->lock);
417 } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
418
419 #if RTC_BIT_INVERTED != 0
420 if ((sec128 & RTC_BIT_INVERTED))
421 tm->tm_sec--;
422 #endif
423
424 /* only keep the carry interrupt enabled if UIE is on */
425 if (!(rtc->periodic_freq & PF_OXS))
426 sh_rtc_setcie(dev, 0);
427
428 dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
429 "mday=%d, mon=%d, year=%d, wday=%d\n",
430 __func__,
431 tm->tm_sec, tm->tm_min, tm->tm_hour,
432 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
433
434 if (rtc_valid_tm(tm) < 0) {
435 dev_err(dev, "invalid date\n");
436 rtc_time_to_tm(0, tm);
437 }
438
439 return 0;
440 }
441
442 static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
443 {
444 struct platform_device *pdev = to_platform_device(dev);
445 struct sh_rtc *rtc = platform_get_drvdata(pdev);
446 unsigned int tmp;
447 int year;
448
449 spin_lock_irq(&rtc->lock);
450
451 /* Reset pre-scaler & stop RTC */
452 tmp = readb(rtc->regbase + RCR2);
453 tmp |= RCR2_RESET;
454 tmp &= ~RCR2_START;
455 writeb(tmp, rtc->regbase + RCR2);
456
457 writeb(bin2bcd(tm->tm_sec), rtc->regbase + RSECCNT);
458 writeb(bin2bcd(tm->tm_min), rtc->regbase + RMINCNT);
459 writeb(bin2bcd(tm->tm_hour), rtc->regbase + RHRCNT);
460 writeb(bin2bcd(tm->tm_wday), rtc->regbase + RWKCNT);
461 writeb(bin2bcd(tm->tm_mday), rtc->regbase + RDAYCNT);
462 writeb(bin2bcd(tm->tm_mon + 1), rtc->regbase + RMONCNT);
463
464 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
465 year = (bin2bcd((tm->tm_year + 1900) / 100) << 8) |
466 bin2bcd(tm->tm_year % 100);
467 writew(year, rtc->regbase + RYRCNT);
468 } else {
469 year = tm->tm_year % 100;
470 writeb(bin2bcd(year), rtc->regbase + RYRCNT);
471 }
472
473 /* Start RTC */
474 tmp = readb(rtc->regbase + RCR2);
475 tmp &= ~RCR2_RESET;
476 tmp |= RCR2_RTCEN | RCR2_START;
477 writeb(tmp, rtc->regbase + RCR2);
478
479 spin_unlock_irq(&rtc->lock);
480
481 return 0;
482 }
483
484 static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off)
485 {
486 unsigned int byte;
487 int value = 0xff; /* return 0xff for ignored values */
488
489 byte = readb(rtc->regbase + reg_off);
490 if (byte & AR_ENB) {
491 byte &= ~AR_ENB; /* strip the enable bit */
492 value = bcd2bin(byte);
493 }
494
495 return value;
496 }
497
498 static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
499 {
500 struct platform_device *pdev = to_platform_device(dev);
501 struct sh_rtc *rtc = platform_get_drvdata(pdev);
502 struct rtc_time *tm = &wkalrm->time;
503
504 spin_lock_irq(&rtc->lock);
505
506 tm->tm_sec = sh_rtc_read_alarm_value(rtc, RSECAR);
507 tm->tm_min = sh_rtc_read_alarm_value(rtc, RMINAR);
508 tm->tm_hour = sh_rtc_read_alarm_value(rtc, RHRAR);
509 tm->tm_wday = sh_rtc_read_alarm_value(rtc, RWKAR);
510 tm->tm_mday = sh_rtc_read_alarm_value(rtc, RDAYAR);
511 tm->tm_mon = sh_rtc_read_alarm_value(rtc, RMONAR);
512 if (tm->tm_mon > 0)
513 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
514 tm->tm_year = 0xffff;
515
516 wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0;
517
518 spin_unlock_irq(&rtc->lock);
519
520 return 0;
521 }
522
523 static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc,
524 int value, int reg_off)
525 {
526 /* < 0 for a value that is ignored */
527 if (value < 0)
528 writeb(0, rtc->regbase + reg_off);
529 else
530 writeb(bin2bcd(value) | AR_ENB, rtc->regbase + reg_off);
531 }
532
533 static int sh_rtc_check_alarm(struct rtc_time *tm)
534 {
535 /*
536 * The original rtc says anything > 0xc0 is "don't care" or "match
537 * all" - most users use 0xff but rtc-dev uses -1 for the same thing.
538 * The original rtc doesn't support years - some things use -1 and
539 * some 0xffff. We use -1 to make out tests easier.
540 */
541 if (tm->tm_year == 0xffff)
542 tm->tm_year = -1;
543 if (tm->tm_mon >= 0xff)
544 tm->tm_mon = -1;
545 if (tm->tm_mday >= 0xff)
546 tm->tm_mday = -1;
547 if (tm->tm_wday >= 0xff)
548 tm->tm_wday = -1;
549 if (tm->tm_hour >= 0xff)
550 tm->tm_hour = -1;
551 if (tm->tm_min >= 0xff)
552 tm->tm_min = -1;
553 if (tm->tm_sec >= 0xff)
554 tm->tm_sec = -1;
555
556 if (tm->tm_year > 9999 ||
557 tm->tm_mon >= 12 ||
558 tm->tm_mday == 0 || tm->tm_mday >= 32 ||
559 tm->tm_wday >= 7 ||
560 tm->tm_hour >= 24 ||
561 tm->tm_min >= 60 ||
562 tm->tm_sec >= 60)
563 return -EINVAL;
564
565 return 0;
566 }
567
568 static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
569 {
570 struct platform_device *pdev = to_platform_device(dev);
571 struct sh_rtc *rtc = platform_get_drvdata(pdev);
572 unsigned int rcr1;
573 struct rtc_time *tm = &wkalrm->time;
574 int mon, err;
575
576 err = sh_rtc_check_alarm(tm);
577 if (unlikely(err < 0))
578 return err;
579
580 spin_lock_irq(&rtc->lock);
581
582 /* disable alarm interrupt and clear the alarm flag */
583 rcr1 = readb(rtc->regbase + RCR1);
584 rcr1 &= ~(RCR1_AF | RCR1_AIE);
585 writeb(rcr1, rtc->regbase + RCR1);
586
587 /* set alarm time */
588 sh_rtc_write_alarm_value(rtc, tm->tm_sec, RSECAR);
589 sh_rtc_write_alarm_value(rtc, tm->tm_min, RMINAR);
590 sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR);
591 sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR);
592 sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR);
593 mon = tm->tm_mon;
594 if (mon >= 0)
595 mon += 1;
596 sh_rtc_write_alarm_value(rtc, mon, RMONAR);
597
598 if (wkalrm->enabled) {
599 rcr1 |= RCR1_AIE;
600 writeb(rcr1, rtc->regbase + RCR1);
601 }
602
603 spin_unlock_irq(&rtc->lock);
604
605 return 0;
606 }
607
608 static int sh_rtc_irq_set_state(struct device *dev, int enabled)
609 {
610 struct platform_device *pdev = to_platform_device(dev);
611 struct sh_rtc *rtc = platform_get_drvdata(pdev);
612
613 if (enabled) {
614 rtc->periodic_freq |= PF_KOU;
615 return sh_rtc_ioctl(dev, RTC_PIE_ON, 0);
616 } else {
617 rtc->periodic_freq &= ~PF_KOU;
618 return sh_rtc_ioctl(dev, RTC_PIE_OFF, 0);
619 }
620 }
621
622 static int sh_rtc_irq_set_freq(struct device *dev, int freq)
623 {
624 if (!is_power_of_2(freq))
625 return -EINVAL;
626 return sh_rtc_ioctl(dev, RTC_IRQP_SET, freq);
627 }
628
629 static struct rtc_class_ops sh_rtc_ops = {
630 .ioctl = sh_rtc_ioctl,
631 .read_time = sh_rtc_read_time,
632 .set_time = sh_rtc_set_time,
633 .read_alarm = sh_rtc_read_alarm,
634 .set_alarm = sh_rtc_set_alarm,
635 .irq_set_state = sh_rtc_irq_set_state,
636 .irq_set_freq = sh_rtc_irq_set_freq,
637 .proc = sh_rtc_proc,
638 };
639
640 static int __devinit sh_rtc_probe(struct platform_device *pdev)
641 {
642 struct sh_rtc *rtc;
643 struct resource *res;
644 int ret;
645
646 rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
647 if (unlikely(!rtc))
648 return -ENOMEM;
649
650 spin_lock_init(&rtc->lock);
651
652 /* get periodic/carry/alarm irqs */
653 ret = platform_get_irq(pdev, 0);
654 if (unlikely(ret <= 0)) {
655 ret = -ENOENT;
656 dev_err(&pdev->dev, "No IRQ resource\n");
657 goto err_badres;
658 }
659 rtc->periodic_irq = ret;
660 rtc->carry_irq = platform_get_irq(pdev, 1);
661 rtc->alarm_irq = platform_get_irq(pdev, 2);
662
663 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
664 if (unlikely(res == NULL)) {
665 ret = -ENOENT;
666 dev_err(&pdev->dev, "No IO resource\n");
667 goto err_badres;
668 }
669
670 rtc->regsize = res->end - res->start + 1;
671
672 rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
673 if (unlikely(!rtc->res)) {
674 ret = -EBUSY;
675 goto err_badres;
676 }
677
678 rtc->regbase = ioremap_nocache(rtc->res->start, rtc->regsize);
679 if (unlikely(!rtc->regbase)) {
680 ret = -EINVAL;
681 goto err_badmap;
682 }
683
684 rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
685 &sh_rtc_ops, THIS_MODULE);
686 if (IS_ERR(rtc->rtc_dev)) {
687 ret = PTR_ERR(rtc->rtc_dev);
688 goto err_unmap;
689 }
690
691 rtc->capabilities = RTC_DEF_CAPABILITIES;
692 if (pdev->dev.platform_data) {
693 struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data;
694
695 /*
696 * Some CPUs have special capabilities in addition to the
697 * default set. Add those in here.
698 */
699 rtc->capabilities |= pinfo->capabilities;
700 }
701
702 rtc->rtc_dev->max_user_freq = 256;
703
704 platform_set_drvdata(pdev, rtc);
705
706 if (rtc->carry_irq <= 0) {
707 /* register shared periodic/carry/alarm irq */
708 ret = request_irq(rtc->periodic_irq, sh_rtc_shared,
709 IRQF_DISABLED, "sh-rtc", rtc);
710 if (unlikely(ret)) {
711 dev_err(&pdev->dev,
712 "request IRQ failed with %d, IRQ %d\n", ret,
713 rtc->periodic_irq);
714 goto err_unmap;
715 }
716 } else {
717 /* register periodic/carry/alarm irqs */
718 ret = request_irq(rtc->periodic_irq, sh_rtc_periodic,
719 IRQF_DISABLED, "sh-rtc period", rtc);
720 if (unlikely(ret)) {
721 dev_err(&pdev->dev,
722 "request period IRQ failed with %d, IRQ %d\n",
723 ret, rtc->periodic_irq);
724 goto err_unmap;
725 }
726
727 ret = request_irq(rtc->carry_irq, sh_rtc_interrupt,
728 IRQF_DISABLED, "sh-rtc carry", rtc);
729 if (unlikely(ret)) {
730 dev_err(&pdev->dev,
731 "request carry IRQ failed with %d, IRQ %d\n",
732 ret, rtc->carry_irq);
733 free_irq(rtc->periodic_irq, rtc);
734 goto err_unmap;
735 }
736
737 ret = request_irq(rtc->alarm_irq, sh_rtc_alarm,
738 IRQF_DISABLED, "sh-rtc alarm", rtc);
739 if (unlikely(ret)) {
740 dev_err(&pdev->dev,
741 "request alarm IRQ failed with %d, IRQ %d\n",
742 ret, rtc->alarm_irq);
743 free_irq(rtc->carry_irq, rtc);
744 free_irq(rtc->periodic_irq, rtc);
745 goto err_unmap;
746 }
747 }
748
749 /* everything disabled by default */
750 rtc->periodic_freq = 0;
751 rtc->rtc_dev->irq_freq = 0;
752 sh_rtc_setpie(&pdev->dev, 0);
753 sh_rtc_setaie(&pdev->dev, 0);
754 sh_rtc_setcie(&pdev->dev, 0);
755 return 0;
756
757 err_unmap:
758 iounmap(rtc->regbase);
759 err_badmap:
760 release_resource(rtc->res);
761 err_badres:
762 kfree(rtc);
763
764 return ret;
765 }
766
767 static int __devexit sh_rtc_remove(struct platform_device *pdev)
768 {
769 struct sh_rtc *rtc = platform_get_drvdata(pdev);
770
771 if (likely(rtc->rtc_dev))
772 rtc_device_unregister(rtc->rtc_dev);
773
774 sh_rtc_setpie(&pdev->dev, 0);
775 sh_rtc_setaie(&pdev->dev, 0);
776 sh_rtc_setcie(&pdev->dev, 0);
777
778 free_irq(rtc->periodic_irq, rtc);
779 if (rtc->carry_irq > 0) {
780 free_irq(rtc->carry_irq, rtc);
781 free_irq(rtc->alarm_irq, rtc);
782 }
783
784 release_resource(rtc->res);
785
786 iounmap(rtc->regbase);
787
788 platform_set_drvdata(pdev, NULL);
789
790 kfree(rtc);
791
792 return 0;
793 }
794 static struct platform_driver sh_rtc_platform_driver = {
795 .driver = {
796 .name = DRV_NAME,
797 .owner = THIS_MODULE,
798 },
799 .probe = sh_rtc_probe,
800 .remove = __devexit_p(sh_rtc_remove),
801 };
802
803 static int __init sh_rtc_init(void)
804 {
805 return platform_driver_register(&sh_rtc_platform_driver);
806 }
807
808 static void __exit sh_rtc_exit(void)
809 {
810 platform_driver_unregister(&sh_rtc_platform_driver);
811 }
812
813 module_init(sh_rtc_init);
814 module_exit(sh_rtc_exit);
815
816 MODULE_DESCRIPTION("SuperH on-chip RTC driver");
817 MODULE_VERSION(DRV_VERSION);
818 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, "
819 "Jamie Lenehan <lenehan@twibble.org>, "
820 "Angelo Castello <angelo.castello@st.com>");
821 MODULE_LICENSE("GPL");
822 MODULE_ALIAS("platform:" DRV_NAME);
Support for the Chinese Samsung S3C2440 based development boards