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17#include <linux/bcd.h>
18#include <linux/init.h>
19#include <linux/kernel.h>
20#include <linux/delay.h>
21#include <linux/interrupt.h>
22#include <linux/rtc.h>
23#include <linux/platform_device.h>
24#include <linux/io.h>
25
26#define DRV_VERSION "0.6"
27
28enum ds1511reg {
29 DS1511_SEC = 0x0,
30 DS1511_MIN = 0x1,
31 DS1511_HOUR = 0x2,
32 DS1511_DOW = 0x3,
33 DS1511_DOM = 0x4,
34 DS1511_MONTH = 0x5,
35 DS1511_YEAR = 0x6,
36 DS1511_CENTURY = 0x7,
37 DS1511_AM1_SEC = 0x8,
38 DS1511_AM2_MIN = 0x9,
39 DS1511_AM3_HOUR = 0xa,
40 DS1511_AM4_DATE = 0xb,
41 DS1511_WD_MSEC = 0xc,
42 DS1511_WD_SEC = 0xd,
43 DS1511_CONTROL_A = 0xe,
44 DS1511_CONTROL_B = 0xf,
45 DS1511_RAMADDR_LSB = 0x10,
46 DS1511_RAMDATA = 0x13
47};
48
49#define DS1511_BLF1 0x80
50#define DS1511_BLF2 0x40
51#define DS1511_PRS 0x20
52#define DS1511_PAB 0x10
53#define DS1511_TDF 0x08
54#define DS1511_KSF 0x04
55#define DS1511_WDF 0x02
56#define DS1511_IRQF 0x01
57#define DS1511_TE 0x80
58#define DS1511_CS 0x40
59#define DS1511_BME 0x20
60#define DS1511_TPE 0x10
61#define DS1511_TIE 0x08
62#define DS1511_KIE 0x04
63#define DS1511_WDE 0x02
64#define DS1511_WDS 0x01
65#define DS1511_RAM_MAX 0xff
66
67#define RTC_CMD DS1511_CONTROL_B
68#define RTC_CMD1 DS1511_CONTROL_A
69
70#define RTC_ALARM_SEC DS1511_AM1_SEC
71#define RTC_ALARM_MIN DS1511_AM2_MIN
72#define RTC_ALARM_HOUR DS1511_AM3_HOUR
73#define RTC_ALARM_DATE DS1511_AM4_DATE
74
75#define RTC_SEC DS1511_SEC
76#define RTC_MIN DS1511_MIN
77#define RTC_HOUR DS1511_HOUR
78#define RTC_DOW DS1511_DOW
79#define RTC_DOM DS1511_DOM
80#define RTC_MON DS1511_MONTH
81#define RTC_YEAR DS1511_YEAR
82#define RTC_CENTURY DS1511_CENTURY
83
84#define RTC_TIE DS1511_TIE
85#define RTC_TE DS1511_TE
86
87struct rtc_plat_data {
88 struct rtc_device *rtc;
89 void __iomem *ioaddr;
90 unsigned long baseaddr;
91 int size;
92 int irq;
93 unsigned int irqen;
94 int alrm_sec;
95 int alrm_min;
96 int alrm_hour;
97 int alrm_mday;
98};
99
100static DEFINE_SPINLOCK(ds1511_lock);
101
102static __iomem char *ds1511_base;
103static u32 reg_spacing = 1;
104
105 static noinline void
106rtc_write(uint8_t val, uint32_t reg)
107{
108 writeb(val, ds1511_base + (reg * reg_spacing));
109}
110
111 static inline void
112rtc_write_alarm(uint8_t val, enum ds1511reg reg)
113{
114 rtc_write((val | 0x80), reg);
115}
116
117 static noinline uint8_t
118rtc_read(enum ds1511reg reg)
119{
120 return readb(ds1511_base + (reg * reg_spacing));
121}
122
123 static inline void
124rtc_disable_update(void)
125{
126 rtc_write((rtc_read(RTC_CMD) & ~RTC_TE), RTC_CMD);
127}
128
129 static void
130rtc_enable_update(void)
131{
132 rtc_write((rtc_read(RTC_CMD) | RTC_TE), RTC_CMD);
133}
134
135
136
137
138
139
140
141#ifdef DS1511_WDOG_RESET_SUPPORT
142
143
144
145
146 void
147ds1511_wdog_set(unsigned long deciseconds)
148{
149
150
151
152 deciseconds %= 10000;
153
154
155
156 rtc_write(bin2bcd(deciseconds % 100), DS1511_WD_MSEC);
157 rtc_write(bin2bcd(deciseconds / 100), DS1511_WD_SEC);
158
159
160
161 rtc_write(DS1511_WDE | DS1511_WDS, RTC_CMD);
162}
163
164 void
165ds1511_wdog_disable(void)
166{
167
168
169
170 rtc_write(rtc_read(RTC_CMD) & ~(DS1511_WDE | DS1511_WDS), RTC_CMD);
171
172
173
174 rtc_write(0, DS1511_WD_MSEC);
175 rtc_write(0, DS1511_WD_SEC);
176}
177#endif
178
179
180
181
182
183
184static int ds1511_rtc_set_time(struct device *dev, struct rtc_time *rtc_tm)
185{
186 u8 mon, day, dow, hrs, min, sec, yrs, cen;
187 unsigned long flags;
188
189
190
191
192 if (rtc_tm->tm_year < 1900) {
193 rtc_tm->tm_year += 1900;
194 }
195
196 if (rtc_tm->tm_year < 1970) {
197 return -EINVAL;
198 }
199 yrs = rtc_tm->tm_year % 100;
200 cen = rtc_tm->tm_year / 100;
201 mon = rtc_tm->tm_mon + 1;
202 day = rtc_tm->tm_mday;
203 dow = rtc_tm->tm_wday & 0x7;
204 hrs = rtc_tm->tm_hour;
205 min = rtc_tm->tm_min;
206 sec = rtc_tm->tm_sec;
207
208 if ((mon > 12) || (day == 0)) {
209 return -EINVAL;
210 }
211
212 if (day > rtc_month_days(rtc_tm->tm_mon, rtc_tm->tm_year)) {
213 return -EINVAL;
214 }
215
216 if ((hrs >= 24) || (min >= 60) || (sec >= 60)) {
217 return -EINVAL;
218 }
219
220
221
222
223 sec = bin2bcd(sec) & 0x7f;
224 min = bin2bcd(min) & 0x7f;
225 hrs = bin2bcd(hrs) & 0x3f;
226 day = bin2bcd(day) & 0x3f;
227 mon = bin2bcd(mon) & 0x1f;
228 yrs = bin2bcd(yrs) & 0xff;
229 cen = bin2bcd(cen) & 0xff;
230
231 spin_lock_irqsave(&ds1511_lock, flags);
232 rtc_disable_update();
233 rtc_write(cen, RTC_CENTURY);
234 rtc_write(yrs, RTC_YEAR);
235 rtc_write((rtc_read(RTC_MON) & 0xe0) | mon, RTC_MON);
236 rtc_write(day, RTC_DOM);
237 rtc_write(hrs, RTC_HOUR);
238 rtc_write(min, RTC_MIN);
239 rtc_write(sec, RTC_SEC);
240 rtc_write(dow, RTC_DOW);
241 rtc_enable_update();
242 spin_unlock_irqrestore(&ds1511_lock, flags);
243
244 return 0;
245}
246
247static int ds1511_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
248{
249 unsigned int century;
250 unsigned long flags;
251
252 spin_lock_irqsave(&ds1511_lock, flags);
253 rtc_disable_update();
254
255 rtc_tm->tm_sec = rtc_read(RTC_SEC) & 0x7f;
256 rtc_tm->tm_min = rtc_read(RTC_MIN) & 0x7f;
257 rtc_tm->tm_hour = rtc_read(RTC_HOUR) & 0x3f;
258 rtc_tm->tm_mday = rtc_read(RTC_DOM) & 0x3f;
259 rtc_tm->tm_wday = rtc_read(RTC_DOW) & 0x7;
260 rtc_tm->tm_mon = rtc_read(RTC_MON) & 0x1f;
261 rtc_tm->tm_year = rtc_read(RTC_YEAR) & 0x7f;
262 century = rtc_read(RTC_CENTURY);
263
264 rtc_enable_update();
265 spin_unlock_irqrestore(&ds1511_lock, flags);
266
267 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
268 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
269 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
270 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
271 rtc_tm->tm_wday = bcd2bin(rtc_tm->tm_wday);
272 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
273 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
274 century = bcd2bin(century) * 100;
275
276
277
278
279
280 century += rtc_tm->tm_year;
281 rtc_tm->tm_year = century - 1900;
282
283 rtc_tm->tm_mon--;
284
285 if (rtc_valid_tm(rtc_tm) < 0) {
286 dev_err(dev, "retrieved date/time is not valid.\n");
287 rtc_time_to_tm(0, rtc_tm);
288 }
289 return 0;
290}
291
292
293
294
295
296
297
298
299
300 static void
301ds1511_rtc_update_alarm(struct rtc_plat_data *pdata)
302{
303 unsigned long flags;
304
305 spin_lock_irqsave(&pdata->rtc->irq_lock, flags);
306 rtc_write(pdata->alrm_mday < 0 || (pdata->irqen & RTC_UF) ?
307 0x80 : bin2bcd(pdata->alrm_mday) & 0x3f,
308 RTC_ALARM_DATE);
309 rtc_write(pdata->alrm_hour < 0 || (pdata->irqen & RTC_UF) ?
310 0x80 : bin2bcd(pdata->alrm_hour) & 0x3f,
311 RTC_ALARM_HOUR);
312 rtc_write(pdata->alrm_min < 0 || (pdata->irqen & RTC_UF) ?
313 0x80 : bin2bcd(pdata->alrm_min) & 0x7f,
314 RTC_ALARM_MIN);
315 rtc_write(pdata->alrm_sec < 0 || (pdata->irqen & RTC_UF) ?
316 0x80 : bin2bcd(pdata->alrm_sec) & 0x7f,
317 RTC_ALARM_SEC);
318 rtc_write(rtc_read(RTC_CMD) | (pdata->irqen ? RTC_TIE : 0), RTC_CMD);
319 rtc_read(RTC_CMD1);
320 spin_unlock_irqrestore(&pdata->rtc->irq_lock, flags);
321}
322
323 static int
324ds1511_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
325{
326 struct platform_device *pdev = to_platform_device(dev);
327 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
328
329 if (pdata->irq <= 0)
330 return -EINVAL;
331
332 pdata->alrm_mday = alrm->time.tm_mday;
333 pdata->alrm_hour = alrm->time.tm_hour;
334 pdata->alrm_min = alrm->time.tm_min;
335 pdata->alrm_sec = alrm->time.tm_sec;
336 if (alrm->enabled) {
337 pdata->irqen |= RTC_AF;
338 }
339 ds1511_rtc_update_alarm(pdata);
340 return 0;
341}
342
343 static int
344ds1511_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
345{
346 struct platform_device *pdev = to_platform_device(dev);
347 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
348
349 if (pdata->irq <= 0)
350 return -EINVAL;
351
352 alrm->time.tm_mday = pdata->alrm_mday < 0 ? 0 : pdata->alrm_mday;
353 alrm->time.tm_hour = pdata->alrm_hour < 0 ? 0 : pdata->alrm_hour;
354 alrm->time.tm_min = pdata->alrm_min < 0 ? 0 : pdata->alrm_min;
355 alrm->time.tm_sec = pdata->alrm_sec < 0 ? 0 : pdata->alrm_sec;
356 alrm->enabled = (pdata->irqen & RTC_AF) ? 1 : 0;
357 return 0;
358}
359
360 static irqreturn_t
361ds1511_interrupt(int irq, void *dev_id)
362{
363 struct platform_device *pdev = dev_id;
364 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
365 unsigned long events = RTC_IRQF;
366
367
368
369
370 if (!(rtc_read(RTC_CMD1) & DS1511_IRQF)) {
371 return IRQ_NONE;
372 }
373 if (rtc_read(RTC_ALARM_SEC) & 0x80) {
374 events |= RTC_UF;
375 } else {
376 events |= RTC_AF;
377 }
378 rtc_update_irq(pdata->rtc, 1, events);
379 return IRQ_HANDLED;
380}
381
382 static int
383ds1511_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
384{
385 struct platform_device *pdev = to_platform_device(dev);
386 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
387
388 if (pdata->irq <= 0) {
389 return -ENOIOCTLCMD;
390 }
391 switch (cmd) {
392 case RTC_AIE_OFF:
393 pdata->irqen &= ~RTC_AF;
394 ds1511_rtc_update_alarm(pdata);
395 break;
396 case RTC_AIE_ON:
397 pdata->irqen |= RTC_AF;
398 ds1511_rtc_update_alarm(pdata);
399 break;
400 case RTC_UIE_OFF:
401 pdata->irqen &= ~RTC_UF;
402 ds1511_rtc_update_alarm(pdata);
403 break;
404 case RTC_UIE_ON:
405 pdata->irqen |= RTC_UF;
406 ds1511_rtc_update_alarm(pdata);
407 break;
408 default:
409 return -ENOIOCTLCMD;
410 }
411 return 0;
412}
413
414static const struct rtc_class_ops ds1511_rtc_ops = {
415 .read_time = ds1511_rtc_read_time,
416 .set_time = ds1511_rtc_set_time,
417 .read_alarm = ds1511_rtc_read_alarm,
418 .set_alarm = ds1511_rtc_set_alarm,
419 .ioctl = ds1511_rtc_ioctl,
420};
421
422 static ssize_t
423ds1511_nvram_read(struct kobject *kobj, struct bin_attribute *ba,
424 char *buf, loff_t pos, size_t size)
425{
426 ssize_t count;
427
428
429
430
431
432 if (size > 1) {
433 rtc_write((rtc_read(RTC_CMD) | DS1511_BME), RTC_CMD);
434 }
435 if (pos > DS1511_RAM_MAX) {
436 pos = DS1511_RAM_MAX;
437 }
438 if (size + pos > DS1511_RAM_MAX + 1) {
439 size = DS1511_RAM_MAX - pos + 1;
440 }
441 rtc_write(pos, DS1511_RAMADDR_LSB);
442 for (count = 0; size > 0; count++, size--) {
443 *buf++ = rtc_read(DS1511_RAMDATA);
444 }
445 if (count > 1) {
446 rtc_write((rtc_read(RTC_CMD) & ~DS1511_BME), RTC_CMD);
447 }
448 return count;
449}
450
451 static ssize_t
452ds1511_nvram_write(struct kobject *kobj, struct bin_attribute *bin_attr,
453 char *buf, loff_t pos, size_t size)
454{
455 ssize_t count;
456
457
458
459
460
461 if (size > 1) {
462 rtc_write((rtc_read(RTC_CMD) | DS1511_BME), RTC_CMD);
463 }
464 if (pos > DS1511_RAM_MAX) {
465 pos = DS1511_RAM_MAX;
466 }
467 if (size + pos > DS1511_RAM_MAX + 1) {
468 size = DS1511_RAM_MAX - pos + 1;
469 }
470 rtc_write(pos, DS1511_RAMADDR_LSB);
471 for (count = 0; size > 0; count++, size--) {
472 rtc_write(*buf++, DS1511_RAMDATA);
473 }
474 if (count > 1) {
475 rtc_write((rtc_read(RTC_CMD) & ~DS1511_BME), RTC_CMD);
476 }
477 return count;
478}
479
480static struct bin_attribute ds1511_nvram_attr = {
481 .attr = {
482 .name = "nvram",
483 .mode = S_IRUGO | S_IWUGO,
484 },
485 .size = DS1511_RAM_MAX,
486 .read = ds1511_nvram_read,
487 .write = ds1511_nvram_write,
488};
489
490 static int __devinit
491ds1511_rtc_probe(struct platform_device *pdev)
492{
493 struct rtc_device *rtc;
494 struct resource *res;
495 struct rtc_plat_data *pdata = NULL;
496 int ret = 0;
497
498 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
499 if (!res) {
500 return -ENODEV;
501 }
502 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
503 if (!pdata) {
504 return -ENOMEM;
505 }
506 pdata->size = res->end - res->start + 1;
507 if (!request_mem_region(res->start, pdata->size, pdev->name)) {
508 ret = -EBUSY;
509 goto out;
510 }
511 pdata->baseaddr = res->start;
512 pdata->size = pdata->size;
513 ds1511_base = ioremap(pdata->baseaddr, pdata->size);
514 if (!ds1511_base) {
515 ret = -ENOMEM;
516 goto out;
517 }
518 pdata->ioaddr = ds1511_base;
519 pdata->irq = platform_get_irq(pdev, 0);
520
521
522
523
524 rtc_write(0, RTC_CMD);
525 rtc_write(0, RTC_CMD1);
526
527
528
529 rtc_write(0, DS1511_WD_MSEC);
530 rtc_write(0, DS1511_WD_SEC);
531
532
533
534 rtc_enable_update();
535
536
537
538
539 if (rtc_read(RTC_CMD1) & DS1511_BLF1) {
540 dev_warn(&pdev->dev, "voltage-low detected.\n");
541 }
542
543
544
545
546
547 if (pdata->irq > 0) {
548 rtc_read(RTC_CMD1);
549 if (request_irq(pdata->irq, ds1511_interrupt,
550 IRQF_DISABLED | IRQF_SHARED, pdev->name, pdev) < 0) {
551
552 dev_warn(&pdev->dev, "interrupt not available.\n");
553 pdata->irq = 0;
554 }
555 }
556
557 rtc = rtc_device_register(pdev->name, &pdev->dev, &ds1511_rtc_ops,
558 THIS_MODULE);
559 if (IS_ERR(rtc)) {
560 ret = PTR_ERR(rtc);
561 goto out;
562 }
563 pdata->rtc = rtc;
564 platform_set_drvdata(pdev, pdata);
565 ret = sysfs_create_bin_file(&pdev->dev.kobj, &ds1511_nvram_attr);
566 if (ret) {
567 goto out;
568 }
569 return 0;
570 out:
571 if (pdata->rtc) {
572 rtc_device_unregister(pdata->rtc);
573 }
574 if (pdata->irq > 0) {
575 free_irq(pdata->irq, pdev);
576 }
577 if (ds1511_base) {
578 iounmap(ds1511_base);
579 ds1511_base = NULL;
580 }
581 if (pdata->baseaddr) {
582 release_mem_region(pdata->baseaddr, pdata->size);
583 }
584
585 kfree(pdata);
586 return ret;
587}
588
589 static int __devexit
590ds1511_rtc_remove(struct platform_device *pdev)
591{
592 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
593
594 sysfs_remove_bin_file(&pdev->dev.kobj, &ds1511_nvram_attr);
595 rtc_device_unregister(pdata->rtc);
596 pdata->rtc = NULL;
597 if (pdata->irq > 0) {
598
599
600
601 rtc_write(rtc_read(RTC_CMD) & ~RTC_TIE, RTC_CMD);
602 rtc_read(RTC_CMD1);
603 free_irq(pdata->irq, pdev);
604 }
605 iounmap(pdata->ioaddr);
606 ds1511_base = NULL;
607 release_mem_region(pdata->baseaddr, pdata->size);
608 kfree(pdata);
609 return 0;
610}
611
612
613MODULE_ALIAS("platform:ds1511");
614
615static struct platform_driver ds1511_rtc_driver = {
616 .probe = ds1511_rtc_probe,
617 .remove = __devexit_p(ds1511_rtc_remove),
618 .driver = {
619 .name = "ds1511",
620 .owner = THIS_MODULE,
621 },
622};
623
624 static int __init
625ds1511_rtc_init(void)
626{
627 return platform_driver_register(&ds1511_rtc_driver);
628}
629
630 static void __exit
631ds1511_rtc_exit(void)
632{
633 platform_driver_unregister(&ds1511_rtc_driver);
634}
635
636module_init(ds1511_rtc_init);
637module_exit(ds1511_rtc_exit);
638
639MODULE_AUTHOR("Andrew Sharp <andy.sharp@onstor.com>");
640MODULE_DESCRIPTION("Dallas DS1511 RTC driver");
641MODULE_LICENSE("GPL");
642MODULE_VERSION(DRV_VERSION);
643
