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V4L/DVB (8522): videodev2: Fix merge conflict
[firewire-audio.git] / drivers / rtc / rtc-s3c.c
blobfed86e507fdfb87aa17e610d1758317731fc1990
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
25 #include <asm/hardware.h>
26 #include <asm/uaccess.h>
27 #include <asm/io.h>
28 #include <asm/irq.h>
29 #include <asm/plat-s3c/regs-rtc.h>
30
31 /* I have yet to find an S3C implementation with more than one
32 * of these rtc blocks in */
33
34 static struct resource *s3c_rtc_mem;
35
36 static void __iomem *s3c_rtc_base;
37 static int s3c_rtc_alarmno = NO_IRQ;
38 static int s3c_rtc_tickno = NO_IRQ;
39 static int s3c_rtc_freq = 1;
40
41 static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
42 static unsigned int tick_count;
43
44 /* IRQ Handlers */
45
46 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
47 {
48 struct rtc_device *rdev = id;
49
50 rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
51 return IRQ_HANDLED;
52 }
53
54 static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
55 {
56 struct rtc_device *rdev = id;
57
58 rtc_update_irq(rdev, tick_count++, RTC_PF | RTC_IRQF);
59 return IRQ_HANDLED;
60 }
61
62 /* Update control registers */
63 static void s3c_rtc_setaie(int to)
64 {
65 unsigned int tmp;
66
67 pr_debug("%s: aie=%d\n", __func__, to);
68
69 tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
70
71 if (to)
72 tmp |= S3C2410_RTCALM_ALMEN;
73
74 writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
75 }
76
77 static void s3c_rtc_setpie(int to)
78 {
79 unsigned int tmp;
80
81 pr_debug("%s: pie=%d\n", __func__, to);
82
83 spin_lock_irq(&s3c_rtc_pie_lock);
84 tmp = readb(s3c_rtc_base + S3C2410_TICNT) & ~S3C2410_TICNT_ENABLE;
85
86 if (to)
87 tmp |= S3C2410_TICNT_ENABLE;
88
89 writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
90 spin_unlock_irq(&s3c_rtc_pie_lock);
91 }
92
93 static void s3c_rtc_setfreq(int freq)
94 {
95 unsigned int tmp;
96
97 spin_lock_irq(&s3c_rtc_pie_lock);
98 tmp = readb(s3c_rtc_base + S3C2410_TICNT) & S3C2410_TICNT_ENABLE;
99
100 s3c_rtc_freq = freq;
101
102 tmp |= (128 / freq)-1;
103
104 writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
105 spin_unlock_irq(&s3c_rtc_pie_lock);
106 }
107
108 /* Time read/write */
109
110 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
111 {
112 unsigned int have_retried = 0;
113 void __iomem *base = s3c_rtc_base;
114
115 retry_get_time:
116 rtc_tm->tm_min = readb(base + S3C2410_RTCMIN);
117 rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
118 rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
119 rtc_tm->tm_mon = readb(base + S3C2410_RTCMON);
120 rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
121 rtc_tm->tm_sec = readb(base + S3C2410_RTCSEC);
122
123 /* the only way to work out wether the system was mid-update
124 * when we read it is to check the second counter, and if it
125 * is zero, then we re-try the entire read
126 */
127
128 if (rtc_tm->tm_sec == 0 && !have_retried) {
129 have_retried = 1;
130 goto retry_get_time;
131 }
132
133 pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n",
134 rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
135 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
136
137 BCD_TO_BIN(rtc_tm->tm_sec);
138 BCD_TO_BIN(rtc_tm->tm_min);
139 BCD_TO_BIN(rtc_tm->tm_hour);
140 BCD_TO_BIN(rtc_tm->tm_mday);
141 BCD_TO_BIN(rtc_tm->tm_mon);
142 BCD_TO_BIN(rtc_tm->tm_year);
143
144 rtc_tm->tm_year += 100;
145 rtc_tm->tm_mon -= 1;
146
147 return 0;
148 }
149
150 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
151 {
152 void __iomem *base = s3c_rtc_base;
153 int year = tm->tm_year - 100;
154
155 pr_debug("set time %02d.%02d.%02d %02d/%02d/%02d\n",
156 tm->tm_year, tm->tm_mon, tm->tm_mday,
157 tm->tm_hour, tm->tm_min, tm->tm_sec);
158
159 /* we get around y2k by simply not supporting it */
160
161 if (year < 0 || year >= 100) {
162 dev_err(dev, "rtc only supports 100 years\n");
163 return -EINVAL;
164 }
165
166 writeb(BIN2BCD(tm->tm_sec), base + S3C2410_RTCSEC);
167 writeb(BIN2BCD(tm->tm_min), base + S3C2410_RTCMIN);
168 writeb(BIN2BCD(tm->tm_hour), base + S3C2410_RTCHOUR);
169 writeb(BIN2BCD(tm->tm_mday), base + S3C2410_RTCDATE);
170 writeb(BIN2BCD(tm->tm_mon + 1), base + S3C2410_RTCMON);
171 writeb(BIN2BCD(year), base + S3C2410_RTCYEAR);
172
173 return 0;
174 }
175
176 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
177 {
178 struct rtc_time *alm_tm = &alrm->time;
179 void __iomem *base = s3c_rtc_base;
180 unsigned int alm_en;
181
182 alm_tm->tm_sec = readb(base + S3C2410_ALMSEC);
183 alm_tm->tm_min = readb(base + S3C2410_ALMMIN);
184 alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
185 alm_tm->tm_mon = readb(base + S3C2410_ALMMON);
186 alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
187 alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
188
189 alm_en = readb(base + S3C2410_RTCALM);
190
191 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
192
193 pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n",
194 alm_en,
195 alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
196 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
197
198
199 /* decode the alarm enable field */
200
201 if (alm_en & S3C2410_RTCALM_SECEN)
202 BCD_TO_BIN(alm_tm->tm_sec);
203 else
204 alm_tm->tm_sec = 0xff;
205
206 if (alm_en & S3C2410_RTCALM_MINEN)
207 BCD_TO_BIN(alm_tm->tm_min);
208 else
209 alm_tm->tm_min = 0xff;
210
211 if (alm_en & S3C2410_RTCALM_HOUREN)
212 BCD_TO_BIN(alm_tm->tm_hour);
213 else
214 alm_tm->tm_hour = 0xff;
215
216 if (alm_en & S3C2410_RTCALM_DAYEN)
217 BCD_TO_BIN(alm_tm->tm_mday);
218 else
219 alm_tm->tm_mday = 0xff;
220
221 if (alm_en & S3C2410_RTCALM_MONEN) {
222 BCD_TO_BIN(alm_tm->tm_mon);
223 alm_tm->tm_mon -= 1;
224 } else {
225 alm_tm->tm_mon = 0xff;
226 }
227
228 if (alm_en & S3C2410_RTCALM_YEAREN)
229 BCD_TO_BIN(alm_tm->tm_year);
230 else
231 alm_tm->tm_year = 0xffff;
232
233 return 0;
234 }
235
236 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
237 {
238 struct rtc_time *tm = &alrm->time;
239 void __iomem *base = s3c_rtc_base;
240 unsigned int alrm_en;
241
242 pr_debug("s3c_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n",
243 alrm->enabled,
244 tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff,
245 tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec);
246
247
248 alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
249 writeb(0x00, base + S3C2410_RTCALM);
250
251 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
252 alrm_en |= S3C2410_RTCALM_SECEN;
253 writeb(BIN2BCD(tm->tm_sec), base + S3C2410_ALMSEC);
254 }
255
256 if (tm->tm_min < 60 && tm->tm_min >= 0) {
257 alrm_en |= S3C2410_RTCALM_MINEN;
258 writeb(BIN2BCD(tm->tm_min), base + S3C2410_ALMMIN);
259 }
260
261 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
262 alrm_en |= S3C2410_RTCALM_HOUREN;
263 writeb(BIN2BCD(tm->tm_hour), base + S3C2410_ALMHOUR);
264 }
265
266 pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
267
268 writeb(alrm_en, base + S3C2410_RTCALM);
269
270 if (0) {
271 alrm_en = readb(base + S3C2410_RTCALM);
272 alrm_en &= ~S3C2410_RTCALM_ALMEN;
273 writeb(alrm_en, base + S3C2410_RTCALM);
274 disable_irq_wake(s3c_rtc_alarmno);
275 }
276
277 if (alrm->enabled)
278 enable_irq_wake(s3c_rtc_alarmno);
279 else
280 disable_irq_wake(s3c_rtc_alarmno);
281
282 return 0;
283 }
284
285 static int s3c_rtc_ioctl(struct device *dev,
286 unsigned int cmd, unsigned long arg)
287 {
288 unsigned int ret = -ENOIOCTLCMD;
289
290 switch (cmd) {
291 case RTC_AIE_OFF:
292 case RTC_AIE_ON:
293 s3c_rtc_setaie((cmd == RTC_AIE_ON) ? 1 : 0);
294 ret = 0;
295 break;
296
297 case RTC_PIE_OFF:
298 case RTC_PIE_ON:
299 tick_count = 0;
300 s3c_rtc_setpie((cmd == RTC_PIE_ON) ? 1 : 0);
301 ret = 0;
302 break;
303
304 case RTC_IRQP_READ:
305 ret = put_user(s3c_rtc_freq, (unsigned long __user *)arg);
306 break;
307
308 case RTC_IRQP_SET:
309 if (!is_power_of_2(arg)) {
310 ret = -EINVAL;
311 goto exit;
312 }
313
314 pr_debug("s3c2410_rtc: setting frequency %ld\n", arg);
315
316 s3c_rtc_setfreq(arg);
317 ret = 0;
318 break;
319
320 case RTC_UIE_ON:
321 case RTC_UIE_OFF:
322 ret = -EINVAL;
323 }
324
325 exit:
326 return ret;
327 }
328
329 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
330 {
331 unsigned int ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
332
333 seq_printf(seq, "periodic_IRQ\t: %s\n",
334 (ticnt & S3C2410_TICNT_ENABLE) ? "yes" : "no" );
335
336 seq_printf(seq, "periodic_freq\t: %d\n", s3c_rtc_freq);
337
338 return 0;
339 }
340
341 static int s3c_rtc_open(struct device *dev)
342 {
343 struct platform_device *pdev = to_platform_device(dev);
344 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
345 int ret;
346
347 ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
348 IRQF_DISABLED, "s3c2410-rtc alarm", rtc_dev);
349
350 if (ret) {
351 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
352 return ret;
353 }
354
355 ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
356 IRQF_DISABLED, "s3c2410-rtc tick", rtc_dev);
357
358 if (ret) {
359 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
360 goto tick_err;
361 }
362
363 return ret;
364
365 tick_err:
366 free_irq(s3c_rtc_alarmno, rtc_dev);
367 return ret;
368 }
369
370 static void s3c_rtc_release(struct device *dev)
371 {
372 struct platform_device *pdev = to_platform_device(dev);
373 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
374
375 /* do not clear AIE here, it may be needed for wake */
376
377 s3c_rtc_setpie(0);
378 free_irq(s3c_rtc_alarmno, rtc_dev);
379 free_irq(s3c_rtc_tickno, rtc_dev);
380 }
381
382 static const struct rtc_class_ops s3c_rtcops = {
383 .open = s3c_rtc_open,
384 .release = s3c_rtc_release,
385 .ioctl = s3c_rtc_ioctl,
386 .read_time = s3c_rtc_gettime,
387 .set_time = s3c_rtc_settime,
388 .read_alarm = s3c_rtc_getalarm,
389 .set_alarm = s3c_rtc_setalarm,
390 .proc = s3c_rtc_proc,
391 };
392
393 static void s3c_rtc_enable(struct platform_device *pdev, int en)
394 {
395 void __iomem *base = s3c_rtc_base;
396 unsigned int tmp;
397
398 if (s3c_rtc_base == NULL)
399 return;
400
401 if (!en) {
402 tmp = readb(base + S3C2410_RTCCON);
403 writeb(tmp & ~S3C2410_RTCCON_RTCEN, base + S3C2410_RTCCON);
404
405 tmp = readb(base + S3C2410_TICNT);
406 writeb(tmp & ~S3C2410_TICNT_ENABLE, base + S3C2410_TICNT);
407 } else {
408 /* re-enable the device, and check it is ok */
409
410 if ((readb(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0){
411 dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
412
413 tmp = readb(base + S3C2410_RTCCON);
414 writeb(tmp|S3C2410_RTCCON_RTCEN, base+S3C2410_RTCCON);
415 }
416
417 if ((readb(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)){
418 dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
419
420 tmp = readb(base + S3C2410_RTCCON);
421 writeb(tmp& ~S3C2410_RTCCON_CNTSEL, base+S3C2410_RTCCON);
422 }
423
424 if ((readb(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)){
425 dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
426
427 tmp = readb(base + S3C2410_RTCCON);
428 writeb(tmp & ~S3C2410_RTCCON_CLKRST, base+S3C2410_RTCCON);
429 }
430 }
431 }
432
433 static int s3c_rtc_remove(struct platform_device *dev)
434 {
435 struct rtc_device *rtc = platform_get_drvdata(dev);
436
437 platform_set_drvdata(dev, NULL);
438 rtc_device_unregister(rtc);
439
440 s3c_rtc_setpie(0);
441 s3c_rtc_setaie(0);
442
443 iounmap(s3c_rtc_base);
444 release_resource(s3c_rtc_mem);
445 kfree(s3c_rtc_mem);
446
447 return 0;
448 }
449
450 static int s3c_rtc_probe(struct platform_device *pdev)
451 {
452 struct rtc_device *rtc;
453 struct resource *res;
454 int ret;
455
456 pr_debug("%s: probe=%p\n", __func__, pdev);
457
458 /* find the IRQs */
459
460 s3c_rtc_tickno = platform_get_irq(pdev, 1);
461 if (s3c_rtc_tickno < 0) {
462 dev_err(&pdev->dev, "no irq for rtc tick\n");
463 return -ENOENT;
464 }
465
466 s3c_rtc_alarmno = platform_get_irq(pdev, 0);
467 if (s3c_rtc_alarmno < 0) {
468 dev_err(&pdev->dev, "no irq for alarm\n");
469 return -ENOENT;
470 }
471
472 pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
473 s3c_rtc_tickno, s3c_rtc_alarmno);
474
475 /* get the memory region */
476
477 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
478 if (res == NULL) {
479 dev_err(&pdev->dev, "failed to get memory region resource\n");
480 return -ENOENT;
481 }
482
483 s3c_rtc_mem = request_mem_region(res->start,
484 res->end-res->start+1,
485 pdev->name);
486
487 if (s3c_rtc_mem == NULL) {
488 dev_err(&pdev->dev, "failed to reserve memory region\n");
489 ret = -ENOENT;
490 goto err_nores;
491 }
492
493 s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
494 if (s3c_rtc_base == NULL) {
495 dev_err(&pdev->dev, "failed ioremap()\n");
496 ret = -EINVAL;
497 goto err_nomap;
498 }
499
500 /* check to see if everything is setup correctly */
501
502 s3c_rtc_enable(pdev, 1);
503
504 pr_debug("s3c2410_rtc: RTCCON=%02x\n",
505 readb(s3c_rtc_base + S3C2410_RTCCON));
506
507 s3c_rtc_setfreq(s3c_rtc_freq);
508
509 /* register RTC and exit */
510
511 rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
512 THIS_MODULE);
513
514 if (IS_ERR(rtc)) {
515 dev_err(&pdev->dev, "cannot attach rtc\n");
516 ret = PTR_ERR(rtc);
517 goto err_nortc;
518 }
519
520 rtc->max_user_freq = 128;
521
522 platform_set_drvdata(pdev, rtc);
523 return 0;
524
525 err_nortc:
526 s3c_rtc_enable(pdev, 0);
527 iounmap(s3c_rtc_base);
528
529 err_nomap:
530 release_resource(s3c_rtc_mem);
531
532 err_nores:
533 return ret;
534 }
535
536 #ifdef CONFIG_PM
537
538 /* RTC Power management control */
539
540 static int ticnt_save;
541
542 static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
543 {
544 /* save TICNT for anyone using periodic interrupts */
545 ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
546 s3c_rtc_enable(pdev, 0);
547 return 0;
548 }
549
550 static int s3c_rtc_resume(struct platform_device *pdev)
551 {
552 s3c_rtc_enable(pdev, 1);
553 writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
554 return 0;
555 }
556 #else
557 #define s3c_rtc_suspend NULL
558 #define s3c_rtc_resume NULL
559 #endif
560
561 static struct platform_driver s3c2410_rtcdrv = {
562 .probe = s3c_rtc_probe,
563 .remove = s3c_rtc_remove,
564 .suspend = s3c_rtc_suspend,
565 .resume = s3c_rtc_resume,
566 .driver = {
567 .name = "s3c2410-rtc",
568 .owner = THIS_MODULE,
569 },
570 };
571
572 static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
573
574 static int __init s3c_rtc_init(void)
575 {
576 printk(banner);
577 return platform_driver_register(&s3c2410_rtcdrv);
578 }
579
580 static void __exit s3c_rtc_exit(void)
581 {
582 platform_driver_unregister(&s3c2410_rtcdrv);
583 }
584
585 module_init(s3c_rtc_init);
586 module_exit(s3c_rtc_exit);
587
588 MODULE_DESCRIPTION("Samsung S3C RTC Driver");
589 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
590 MODULE_LICENSE("GPL");
591 MODULE_ALIAS("platform:s3c2410-rtc");
AMDTP streaming driver for the Linux FireWire stack (Juju)