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[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / rtc / rtc-s3c.c
blob70b68d35f9694c804272c1bca502253f15a563c9
1 /* drivers/rtc/rtc-s3c.c
2 *
3 * Copyright (c) 2004,2006 Simtec Electronics
4 * Ben Dooks, <ben@simtec.co.uk>
5 * http://armlinux.simtec.co.uk/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * S3C2410/S3C2440/S3C24XX Internal RTC Driver
12 */
13
14 #include <linux/module.h>
15 #include <linux/fs.h>
16 #include <linux/string.h>
17 #include <linux/init.h>
18 #include <linux/platform_device.h>
19 #include <linux/interrupt.h>
20 #include <linux/rtc.h>
21 #include <linux/bcd.h>
22 #include <linux/clk.h>
23 #include <linux/log2.h>
24 #include <linux/slab.h>
25
26 #include <mach/hardware.h>
27 #include <asm/uaccess.h>
28 #include <asm/io.h>
29 #include <asm/irq.h>
30 #include <plat/regs-rtc.h>
31
32 enum s3c_cpu_type {
33 TYPE_S3C2410,
34 TYPE_S3C64XX,
35 };
36
37 /* I have yet to find an S3C implementation with more than one
38 * of these rtc blocks in */
39
40 static struct resource *s3c_rtc_mem;
41
42 static void __iomem *s3c_rtc_base;
43 static int s3c_rtc_alarmno = NO_IRQ;
44 static int s3c_rtc_tickno = NO_IRQ;
45 static enum s3c_cpu_type s3c_rtc_cpu_type;
46
47 static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
48
49 /* IRQ Handlers */
50
51 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
52 {
53 struct rtc_device *rdev = id;
54
55 rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
56 return IRQ_HANDLED;
57 }
58
59 static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
60 {
61 struct rtc_device *rdev = id;
62
63 rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
64 return IRQ_HANDLED;
65 }
66
67 /* Update control registers */
68 static void s3c_rtc_setaie(int to)
69 {
70 unsigned int tmp;
71
72 pr_debug("%s: aie=%d\n", __func__, to);
73
74 tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
75
76 if (to)
77 tmp |= S3C2410_RTCALM_ALMEN;
78
79 writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
80 }
81
82 static int s3c_rtc_setpie(struct device *dev, int enabled)
83 {
84 unsigned int tmp;
85
86 pr_debug("%s: pie=%d\n", __func__, enabled);
87
88 spin_lock_irq(&s3c_rtc_pie_lock);
89
90 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
91 tmp = readb(s3c_rtc_base + S3C2410_RTCCON);
92 tmp &= ~S3C64XX_RTCCON_TICEN;
93
94 if (enabled)
95 tmp |= S3C64XX_RTCCON_TICEN;
96
97 writeb(tmp, s3c_rtc_base + S3C2410_RTCCON);
98 } else {
99 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
100 tmp &= ~S3C2410_TICNT_ENABLE;
101
102 if (enabled)
103 tmp |= S3C2410_TICNT_ENABLE;
104
105 writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
106 }
107
108 spin_unlock_irq(&s3c_rtc_pie_lock);
109
110 return 0;
111 }
112
113 static int s3c_rtc_setfreq(struct device *dev, int freq)
114 {
115 struct platform_device *pdev = to_platform_device(dev);
116 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
117 unsigned int tmp = 0;
118
119 if (!is_power_of_2(freq))
120 return -EINVAL;
121
122 spin_lock_irq(&s3c_rtc_pie_lock);
123
124 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
125 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
126 tmp &= S3C2410_TICNT_ENABLE;
127 }
128
129 tmp |= (rtc_dev->max_user_freq / freq)-1;
130
131 writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
132 spin_unlock_irq(&s3c_rtc_pie_lock);
133
134 return 0;
135 }
136
137 /* Time read/write */
138
139 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
140 {
141 unsigned int have_retried = 0;
142 void __iomem *base = s3c_rtc_base;
143
144 retry_get_time:
145 rtc_tm->tm_min = readb(base + S3C2410_RTCMIN);
146 rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
147 rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
148 rtc_tm->tm_mon = readb(base + S3C2410_RTCMON);
149 rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
150 rtc_tm->tm_sec = readb(base + S3C2410_RTCSEC);
151
152 /* the only way to work out wether the system was mid-update
153 * when we read it is to check the second counter, and if it
154 * is zero, then we re-try the entire read
155 */
156
157 if (rtc_tm->tm_sec == 0 && !have_retried) {
158 have_retried = 1;
159 goto retry_get_time;
160 }
161
162 pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n",
163 rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
164 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
165
166 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
167 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
168 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
169 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
170 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
171 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
172
173 rtc_tm->tm_year += 100;
174 rtc_tm->tm_mon -= 1;
175
176 return 0;
177 }
178
179 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
180 {
181 void __iomem *base = s3c_rtc_base;
182 int year = tm->tm_year - 100;
183
184 pr_debug("set time %02d.%02d.%02d %02d/%02d/%02d\n",
185 tm->tm_year, tm->tm_mon, tm->tm_mday,
186 tm->tm_hour, tm->tm_min, tm->tm_sec);
187
188 /* we get around y2k by simply not supporting it */
189
190 if (year < 0 || year >= 100) {
191 dev_err(dev, "rtc only supports 100 years\n");
192 return -EINVAL;
193 }
194
195 writeb(bin2bcd(tm->tm_sec), base + S3C2410_RTCSEC);
196 writeb(bin2bcd(tm->tm_min), base + S3C2410_RTCMIN);
197 writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
198 writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
199 writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
200 writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
201
202 return 0;
203 }
204
205 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
206 {
207 struct rtc_time *alm_tm = &alrm->time;
208 void __iomem *base = s3c_rtc_base;
209 unsigned int alm_en;
210
211 alm_tm->tm_sec = readb(base + S3C2410_ALMSEC);
212 alm_tm->tm_min = readb(base + S3C2410_ALMMIN);
213 alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
214 alm_tm->tm_mon = readb(base + S3C2410_ALMMON);
215 alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
216 alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
217
218 alm_en = readb(base + S3C2410_RTCALM);
219
220 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
221
222 pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n",
223 alm_en,
224 alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
225 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
226
227
228 /* decode the alarm enable field */
229
230 if (alm_en & S3C2410_RTCALM_SECEN)
231 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
232 else
233 alm_tm->tm_sec = 0xff;
234
235 if (alm_en & S3C2410_RTCALM_MINEN)
236 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
237 else
238 alm_tm->tm_min = 0xff;
239
240 if (alm_en & S3C2410_RTCALM_HOUREN)
241 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
242 else
243 alm_tm->tm_hour = 0xff;
244
245 if (alm_en & S3C2410_RTCALM_DAYEN)
246 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
247 else
248 alm_tm->tm_mday = 0xff;
249
250 if (alm_en & S3C2410_RTCALM_MONEN) {
251 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
252 alm_tm->tm_mon -= 1;
253 } else {
254 alm_tm->tm_mon = 0xff;
255 }
256
257 if (alm_en & S3C2410_RTCALM_YEAREN)
258 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
259 else
260 alm_tm->tm_year = 0xffff;
261
262 return 0;
263 }
264
265 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
266 {
267 struct rtc_time *tm = &alrm->time;
268 void __iomem *base = s3c_rtc_base;
269 unsigned int alrm_en;
270
271 pr_debug("s3c_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n",
272 alrm->enabled,
273 tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff,
274 tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec);
275
276
277 alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
278 writeb(0x00, base + S3C2410_RTCALM);
279
280 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
281 alrm_en |= S3C2410_RTCALM_SECEN;
282 writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
283 }
284
285 if (tm->tm_min < 60 && tm->tm_min >= 0) {
286 alrm_en |= S3C2410_RTCALM_MINEN;
287 writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
288 }
289
290 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
291 alrm_en |= S3C2410_RTCALM_HOUREN;
292 writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
293 }
294
295 pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
296
297 writeb(alrm_en, base + S3C2410_RTCALM);
298
299 s3c_rtc_setaie(alrm->enabled);
300
301 if (alrm->enabled)
302 enable_irq_wake(s3c_rtc_alarmno);
303 else
304 disable_irq_wake(s3c_rtc_alarmno);
305
306 return 0;
307 }
308
309 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
310 {
311 unsigned int ticnt;
312
313 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
314 ticnt = readb(s3c_rtc_base + S3C2410_RTCCON);
315 ticnt &= S3C64XX_RTCCON_TICEN;
316 } else {
317 ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
318 ticnt &= S3C2410_TICNT_ENABLE;
319 }
320
321 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
322 return 0;
323 }
324
325 static int s3c_rtc_open(struct device *dev)
326 {
327 struct platform_device *pdev = to_platform_device(dev);
328 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
329 int ret;
330
331 ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
332 IRQF_DISABLED, "s3c2410-rtc alarm", rtc_dev);
333
334 if (ret) {
335 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
336 return ret;
337 }
338
339 ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
340 IRQF_DISABLED, "s3c2410-rtc tick", rtc_dev);
341
342 if (ret) {
343 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
344 goto tick_err;
345 }
346
347 return ret;
348
349 tick_err:
350 free_irq(s3c_rtc_alarmno, rtc_dev);
351 return ret;
352 }
353
354 static void s3c_rtc_release(struct device *dev)
355 {
356 struct platform_device *pdev = to_platform_device(dev);
357 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
358
359 /* do not clear AIE here, it may be needed for wake */
360
361 s3c_rtc_setpie(dev, 0);
362 free_irq(s3c_rtc_alarmno, rtc_dev);
363 free_irq(s3c_rtc_tickno, rtc_dev);
364 }
365
366 static const struct rtc_class_ops s3c_rtcops = {
367 .open = s3c_rtc_open,
368 .release = s3c_rtc_release,
369 .read_time = s3c_rtc_gettime,
370 .set_time = s3c_rtc_settime,
371 .read_alarm = s3c_rtc_getalarm,
372 .set_alarm = s3c_rtc_setalarm,
373 .irq_set_freq = s3c_rtc_setfreq,
374 .irq_set_state = s3c_rtc_setpie,
375 .proc = s3c_rtc_proc,
376 };
377
378 static void s3c_rtc_enable(struct platform_device *pdev, int en)
379 {
380 void __iomem *base = s3c_rtc_base;
381 unsigned int tmp;
382
383 if (s3c_rtc_base == NULL)
384 return;
385
386 if (!en) {
387 tmp = readb(base + S3C2410_RTCCON);
388 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
389 tmp &= ~S3C64XX_RTCCON_TICEN;
390 tmp &= ~S3C2410_RTCCON_RTCEN;
391 writeb(tmp, base + S3C2410_RTCCON);
392
393 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
394 tmp = readb(base + S3C2410_TICNT);
395 tmp &= ~S3C2410_TICNT_ENABLE;
396 writeb(tmp, base + S3C2410_TICNT);
397 }
398 } else {
399 /* re-enable the device, and check it is ok */
400
401 if ((readb(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0){
402 dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
403
404 tmp = readb(base + S3C2410_RTCCON);
405 writeb(tmp|S3C2410_RTCCON_RTCEN, base+S3C2410_RTCCON);
406 }
407
408 if ((readb(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)){
409 dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
410
411 tmp = readb(base + S3C2410_RTCCON);
412 writeb(tmp& ~S3C2410_RTCCON_CNTSEL, base+S3C2410_RTCCON);
413 }
414
415 if ((readb(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)){
416 dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
417
418 tmp = readb(base + S3C2410_RTCCON);
419 writeb(tmp & ~S3C2410_RTCCON_CLKRST, base+S3C2410_RTCCON);
420 }
421 }
422 }
423
424 static int __devexit s3c_rtc_remove(struct platform_device *dev)
425 {
426 struct rtc_device *rtc = platform_get_drvdata(dev);
427
428 platform_set_drvdata(dev, NULL);
429 rtc_device_unregister(rtc);
430
431 s3c_rtc_setpie(&dev->dev, 0);
432 s3c_rtc_setaie(0);
433
434 iounmap(s3c_rtc_base);
435 release_resource(s3c_rtc_mem);
436 kfree(s3c_rtc_mem);
437
438 return 0;
439 }
440
441 static int __devinit s3c_rtc_probe(struct platform_device *pdev)
442 {
443 struct rtc_device *rtc;
444 struct resource *res;
445 int ret;
446
447 pr_debug("%s: probe=%p\n", __func__, pdev);
448
449 /* find the IRQs */
450
451 s3c_rtc_tickno = platform_get_irq(pdev, 1);
452 if (s3c_rtc_tickno < 0) {
453 dev_err(&pdev->dev, "no irq for rtc tick\n");
454 return -ENOENT;
455 }
456
457 s3c_rtc_alarmno = platform_get_irq(pdev, 0);
458 if (s3c_rtc_alarmno < 0) {
459 dev_err(&pdev->dev, "no irq for alarm\n");
460 return -ENOENT;
461 }
462
463 pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
464 s3c_rtc_tickno, s3c_rtc_alarmno);
465
466 /* get the memory region */
467
468 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
469 if (res == NULL) {
470 dev_err(&pdev->dev, "failed to get memory region resource\n");
471 return -ENOENT;
472 }
473
474 s3c_rtc_mem = request_mem_region(res->start,
475 res->end-res->start+1,
476 pdev->name);
477
478 if (s3c_rtc_mem == NULL) {
479 dev_err(&pdev->dev, "failed to reserve memory region\n");
480 ret = -ENOENT;
481 goto err_nores;
482 }
483
484 s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
485 if (s3c_rtc_base == NULL) {
486 dev_err(&pdev->dev, "failed ioremap()\n");
487 ret = -EINVAL;
488 goto err_nomap;
489 }
490
491 /* check to see if everything is setup correctly */
492
493 s3c_rtc_enable(pdev, 1);
494
495 pr_debug("s3c2410_rtc: RTCCON=%02x\n",
496 readb(s3c_rtc_base + S3C2410_RTCCON));
497
498 device_init_wakeup(&pdev->dev, 1);
499
500 /* register RTC and exit */
501
502 rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
503 THIS_MODULE);
504
505 if (IS_ERR(rtc)) {
506 dev_err(&pdev->dev, "cannot attach rtc\n");
507 ret = PTR_ERR(rtc);
508 goto err_nortc;
509 }
510
511 s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;
512
513 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
514 rtc->max_user_freq = 32768;
515 else
516 rtc->max_user_freq = 128;
517
518 platform_set_drvdata(pdev, rtc);
519
520 s3c_rtc_setfreq(&pdev->dev, 1);
521
522 return 0;
523
524 err_nortc:
525 s3c_rtc_enable(pdev, 0);
526 iounmap(s3c_rtc_base);
527
528 err_nomap:
529 release_resource(s3c_rtc_mem);
530
531 err_nores:
532 return ret;
533 }
534
535 #ifdef CONFIG_PM
536
537 /* RTC Power management control */
538
539 static int ticnt_save, ticnt_en_save;
540
541 static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
542 {
543 /* save TICNT for anyone using periodic interrupts */
544 ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
545 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
546 ticnt_en_save = readb(s3c_rtc_base + S3C2410_RTCCON);
547 ticnt_en_save &= S3C64XX_RTCCON_TICEN;
548 }
549 s3c_rtc_enable(pdev, 0);
550 return 0;
551 }
552
553 static int s3c_rtc_resume(struct platform_device *pdev)
554 {
555 unsigned int tmp;
556
557 s3c_rtc_enable(pdev, 1);
558 writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
559 if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
560 tmp = readb(s3c_rtc_base + S3C2410_RTCCON);
561 writeb(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
562 }
563 return 0;
564 }
565 #else
566 #define s3c_rtc_suspend NULL
567 #define s3c_rtc_resume NULL
568 #endif
569
570 static struct platform_device_id s3c_rtc_driver_ids[] = {
571 {
572 .name = "s3c2410-rtc",
573 .driver_data = TYPE_S3C2410,
574 }, {
575 .name = "s3c64xx-rtc",
576 .driver_data = TYPE_S3C64XX,
577 },
578 { }
579 };
580
581 MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
582
583 static struct platform_driver s3c_rtc_driver = {
584 .probe = s3c_rtc_probe,
585 .remove = __devexit_p(s3c_rtc_remove),
586 .suspend = s3c_rtc_suspend,
587 .resume = s3c_rtc_resume,
588 .id_table = s3c_rtc_driver_ids,
589 .driver = {
590 .name = "s3c-rtc",
591 .owner = THIS_MODULE,
592 },
593 };
594
595 static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
596
597 static int __init s3c_rtc_init(void)
598 {
599 printk(banner);
600 return platform_driver_register(&s3c_rtc_driver);
601 }
602
603 static void __exit s3c_rtc_exit(void)
604 {
605 platform_driver_unregister(&s3c_rtc_driver);
606 }
607
608 module_init(s3c_rtc_init);
609 module_exit(s3c_rtc_exit);
610
611 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
612 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
613 MODULE_LICENSE("GPL");
614 MODULE_ALIAS("platform:s3c2410-rtc");
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