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22#include <linux/kernel.h>
23#include <linux/init.h>
24#include <linux/module.h>
25#include <linux/ioport.h>
26#include <linux/delay.h>
27#include <linux/spinlock.h>
28#include <linux/rtc.h>
29#include <linux/bcd.h>
30#include <linux/platform_device.h>
31#include <linux/io.h>
32#include <linux/slab.h>
33
34
35
36
37
38
39
40
41
42
43#define DAVINCI_PRTCIF_PID 0x00
44#define PRTCIF_CTLR 0x04
45#define PRTCIF_LDATA 0x08
46#define PRTCIF_UDATA 0x0C
47#define PRTCIF_INTEN 0x10
48#define PRTCIF_INTFLG 0x14
49
50
51#define PRTCIF_CTLR_BUSY BIT(31)
52#define PRTCIF_CTLR_SIZE BIT(25)
53#define PRTCIF_CTLR_DIR BIT(24)
54#define PRTCIF_CTLR_BENU_MSB BIT(23)
55#define PRTCIF_CTLR_BENU_3RD_BYTE BIT(22)
56#define PRTCIF_CTLR_BENU_2ND_BYTE BIT(21)
57#define PRTCIF_CTLR_BENU_LSB BIT(20)
58#define PRTCIF_CTLR_BENU_MASK (0x00F00000)
59#define PRTCIF_CTLR_BENL_MSB BIT(19)
60#define PRTCIF_CTLR_BENL_3RD_BYTE BIT(18)
61#define PRTCIF_CTLR_BENL_2ND_BYTE BIT(17)
62#define PRTCIF_CTLR_BENL_LSB BIT(16)
63#define PRTCIF_CTLR_BENL_MASK (0x000F0000)
64
65
66#define PRTCIF_INTEN_RTCSS BIT(1)
67#define PRTCIF_INTEN_RTCIF BIT(0)
68#define PRTCIF_INTEN_MASK (PRTCIF_INTEN_RTCSS \
69 | PRTCIF_INTEN_RTCIF)
70
71
72#define PRTCIF_INTFLG_RTCSS BIT(1)
73#define PRTCIF_INTFLG_RTCIF BIT(0)
74#define PRTCIF_INTFLG_MASK (PRTCIF_INTFLG_RTCSS \
75 | PRTCIF_INTFLG_RTCIF)
76
77
78#define PRTCSS_RTC_INTC_EXTENA1 (0x0C)
79#define PRTCSS_RTC_CTRL (0x10)
80#define PRTCSS_RTC_WDT (0x11)
81#define PRTCSS_RTC_TMR0 (0x12)
82#define PRTCSS_RTC_TMR1 (0x13)
83#define PRTCSS_RTC_CCTRL (0x14)
84#define PRTCSS_RTC_SEC (0x15)
85#define PRTCSS_RTC_MIN (0x16)
86#define PRTCSS_RTC_HOUR (0x17)
87#define PRTCSS_RTC_DAY0 (0x18)
88#define PRTCSS_RTC_DAY1 (0x19)
89#define PRTCSS_RTC_AMIN (0x1A)
90#define PRTCSS_RTC_AHOUR (0x1B)
91#define PRTCSS_RTC_ADAY0 (0x1C)
92#define PRTCSS_RTC_ADAY1 (0x1D)
93#define PRTCSS_RTC_CLKC_CNT (0x20)
94
95
96#define PRTCSS_RTC_INTC_EXTENA1_MASK (0x07)
97
98
99#define PRTCSS_RTC_CTRL_WDTBUS BIT(7)
100#define PRTCSS_RTC_CTRL_WEN BIT(6)
101#define PRTCSS_RTC_CTRL_WDRT BIT(5)
102#define PRTCSS_RTC_CTRL_WDTFLG BIT(4)
103#define PRTCSS_RTC_CTRL_TE BIT(3)
104#define PRTCSS_RTC_CTRL_TIEN BIT(2)
105#define PRTCSS_RTC_CTRL_TMRFLG BIT(1)
106#define PRTCSS_RTC_CTRL_TMMD BIT(0)
107
108
109#define PRTCSS_RTC_CCTRL_CALBUSY BIT(7)
110#define PRTCSS_RTC_CCTRL_DAEN BIT(5)
111#define PRTCSS_RTC_CCTRL_HAEN BIT(4)
112#define PRTCSS_RTC_CCTRL_MAEN BIT(3)
113#define PRTCSS_RTC_CCTRL_ALMFLG BIT(2)
114#define PRTCSS_RTC_CCTRL_AIEN BIT(1)
115#define PRTCSS_RTC_CCTRL_CAEN BIT(0)
116
117static DEFINE_SPINLOCK(davinci_rtc_lock);
118
119struct davinci_rtc {
120 struct rtc_device *rtc;
121 void __iomem *base;
122 resource_size_t pbase;
123 size_t base_size;
124 int irq;
125};
126
127static inline void rtcif_write(struct davinci_rtc *davinci_rtc,
128 u32 val, u32 addr)
129{
130 writel(val, davinci_rtc->base + addr);
131}
132
133static inline u32 rtcif_read(struct davinci_rtc *davinci_rtc, u32 addr)
134{
135 return readl(davinci_rtc->base + addr);
136}
137
138static inline void rtcif_wait(struct davinci_rtc *davinci_rtc)
139{
140 while (rtcif_read(davinci_rtc, PRTCIF_CTLR) & PRTCIF_CTLR_BUSY)
141 cpu_relax();
142}
143
144static inline void rtcss_write(struct davinci_rtc *davinci_rtc,
145 unsigned long val, u8 addr)
146{
147 rtcif_wait(davinci_rtc);
148
149 rtcif_write(davinci_rtc, PRTCIF_CTLR_BENL_LSB | addr, PRTCIF_CTLR);
150 rtcif_write(davinci_rtc, val, PRTCIF_LDATA);
151
152 rtcif_wait(davinci_rtc);
153}
154
155static inline u8 rtcss_read(struct davinci_rtc *davinci_rtc, u8 addr)
156{
157 rtcif_wait(davinci_rtc);
158
159 rtcif_write(davinci_rtc, PRTCIF_CTLR_DIR | PRTCIF_CTLR_BENL_LSB | addr,
160 PRTCIF_CTLR);
161
162 rtcif_wait(davinci_rtc);
163
164 return rtcif_read(davinci_rtc, PRTCIF_LDATA);
165}
166
167static inline void davinci_rtcss_calendar_wait(struct davinci_rtc *davinci_rtc)
168{
169 while (rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL) &
170 PRTCSS_RTC_CCTRL_CALBUSY)
171 cpu_relax();
172}
173
174static irqreturn_t davinci_rtc_interrupt(int irq, void *class_dev)
175{
176 struct davinci_rtc *davinci_rtc = class_dev;
177 unsigned long events = 0;
178 u32 irq_flg;
179 u8 alm_irq, tmr_irq;
180 u8 rtc_ctrl, rtc_cctrl;
181 int ret = IRQ_NONE;
182
183 irq_flg = rtcif_read(davinci_rtc, PRTCIF_INTFLG) &
184 PRTCIF_INTFLG_RTCSS;
185
186 alm_irq = rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL) &
187 PRTCSS_RTC_CCTRL_ALMFLG;
188
189 tmr_irq = rtcss_read(davinci_rtc, PRTCSS_RTC_CTRL) &
190 PRTCSS_RTC_CTRL_TMRFLG;
191
192 if (irq_flg) {
193 if (alm_irq) {
194 events |= RTC_IRQF | RTC_AF;
195 rtc_cctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL);
196 rtc_cctrl |= PRTCSS_RTC_CCTRL_ALMFLG;
197 rtcss_write(davinci_rtc, rtc_cctrl, PRTCSS_RTC_CCTRL);
198 } else if (tmr_irq) {
199 events |= RTC_IRQF | RTC_PF;
200 rtc_ctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CTRL);
201 rtc_ctrl |= PRTCSS_RTC_CTRL_TMRFLG;
202 rtcss_write(davinci_rtc, rtc_ctrl, PRTCSS_RTC_CTRL);
203 }
204
205 rtcif_write(davinci_rtc, PRTCIF_INTFLG_RTCSS,
206 PRTCIF_INTFLG);
207 rtc_update_irq(davinci_rtc->rtc, 1, events);
208
209 ret = IRQ_HANDLED;
210 }
211
212 return ret;
213}
214
215static int
216davinci_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
217{
218 struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
219 u8 rtc_ctrl;
220 unsigned long flags;
221 int ret = 0;
222
223 spin_lock_irqsave(&davinci_rtc_lock, flags);
224
225 rtc_ctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CTRL);
226
227 switch (cmd) {
228 case RTC_WIE_ON:
229 rtc_ctrl |= PRTCSS_RTC_CTRL_WEN | PRTCSS_RTC_CTRL_WDTFLG;
230 break;
231 case RTC_WIE_OFF:
232 rtc_ctrl &= ~PRTCSS_RTC_CTRL_WEN;
233 break;
234 default:
235 ret = -ENOIOCTLCMD;
236 }
237
238 rtcss_write(davinci_rtc, rtc_ctrl, PRTCSS_RTC_CTRL);
239
240 spin_unlock_irqrestore(&davinci_rtc_lock, flags);
241
242 return ret;
243}
244
245static int convertfromdays(u16 days, struct rtc_time *tm)
246{
247 int tmp_days, year, mon;
248
249 for (year = 2000;; year++) {
250 tmp_days = rtc_year_days(1, 12, year);
251 if (days >= tmp_days)
252 days -= tmp_days;
253 else {
254 for (mon = 0;; mon++) {
255 tmp_days = rtc_month_days(mon, year);
256 if (days >= tmp_days) {
257 days -= tmp_days;
258 } else {
259 tm->tm_year = year - 1900;
260 tm->tm_mon = mon;
261 tm->tm_mday = days + 1;
262 break;
263 }
264 }
265 break;
266 }
267 }
268 return 0;
269}
270
271static int convert2days(u16 *days, struct rtc_time *tm)
272{
273 int i;
274 *days = 0;
275
276
277 if (tm->tm_year < 100 || tm->tm_year > 199)
278 return -EINVAL;
279
280 for (i = 2000; i < 1900 + tm->tm_year; i++)
281 *days += rtc_year_days(1, 12, i);
282
283 *days += rtc_year_days(tm->tm_mday, tm->tm_mon, 1900 + tm->tm_year);
284
285 return 0;
286}
287
288static int davinci_rtc_read_time(struct device *dev, struct rtc_time *tm)
289{
290 struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
291 u16 days = 0;
292 u8 day0, day1;
293 unsigned long flags;
294
295 spin_lock_irqsave(&davinci_rtc_lock, flags);
296
297 davinci_rtcss_calendar_wait(davinci_rtc);
298 tm->tm_sec = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_SEC));
299
300 davinci_rtcss_calendar_wait(davinci_rtc);
301 tm->tm_min = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_MIN));
302
303 davinci_rtcss_calendar_wait(davinci_rtc);
304 tm->tm_hour = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_HOUR));
305
306 davinci_rtcss_calendar_wait(davinci_rtc);
307 day0 = rtcss_read(davinci_rtc, PRTCSS_RTC_DAY0);
308
309 davinci_rtcss_calendar_wait(davinci_rtc);
310 day1 = rtcss_read(davinci_rtc, PRTCSS_RTC_DAY1);
311
312 spin_unlock_irqrestore(&davinci_rtc_lock, flags);
313
314 days |= day1;
315 days <<= 8;
316 days |= day0;
317
318 if (convertfromdays(days, tm) < 0)
319 return -EINVAL;
320
321 return 0;
322}
323
324static int davinci_rtc_set_time(struct device *dev, struct rtc_time *tm)
325{
326 struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
327 u16 days;
328 u8 rtc_cctrl;
329 unsigned long flags;
330
331 if (convert2days(&days, tm) < 0)
332 return -EINVAL;
333
334 spin_lock_irqsave(&davinci_rtc_lock, flags);
335
336 davinci_rtcss_calendar_wait(davinci_rtc);
337 rtcss_write(davinci_rtc, bin2bcd(tm->tm_sec), PRTCSS_RTC_SEC);
338
339 davinci_rtcss_calendar_wait(davinci_rtc);
340 rtcss_write(davinci_rtc, bin2bcd(tm->tm_min), PRTCSS_RTC_MIN);
341
342 davinci_rtcss_calendar_wait(davinci_rtc);
343 rtcss_write(davinci_rtc, bin2bcd(tm->tm_hour), PRTCSS_RTC_HOUR);
344
345 davinci_rtcss_calendar_wait(davinci_rtc);
346 rtcss_write(davinci_rtc, days & 0xFF, PRTCSS_RTC_DAY0);
347
348 davinci_rtcss_calendar_wait(davinci_rtc);
349 rtcss_write(davinci_rtc, (days & 0xFF00) >> 8, PRTCSS_RTC_DAY1);
350
351 rtc_cctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL);
352 rtc_cctrl |= PRTCSS_RTC_CCTRL_CAEN;
353 rtcss_write(davinci_rtc, rtc_cctrl, PRTCSS_RTC_CCTRL);
354
355 spin_unlock_irqrestore(&davinci_rtc_lock, flags);
356
357 return 0;
358}
359
360static int davinci_rtc_alarm_irq_enable(struct device *dev,
361 unsigned int enabled)
362{
363 struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
364 unsigned long flags;
365 u8 rtc_cctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL);
366
367 spin_lock_irqsave(&davinci_rtc_lock, flags);
368
369 if (enabled)
370 rtc_cctrl |= PRTCSS_RTC_CCTRL_DAEN |
371 PRTCSS_RTC_CCTRL_HAEN |
372 PRTCSS_RTC_CCTRL_MAEN |
373 PRTCSS_RTC_CCTRL_ALMFLG |
374 PRTCSS_RTC_CCTRL_AIEN;
375 else
376 rtc_cctrl &= ~PRTCSS_RTC_CCTRL_AIEN;
377
378 davinci_rtcss_calendar_wait(davinci_rtc);
379 rtcss_write(davinci_rtc, rtc_cctrl, PRTCSS_RTC_CCTRL);
380
381 spin_unlock_irqrestore(&davinci_rtc_lock, flags);
382
383 return 0;
384}
385
386static int davinci_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
387{
388 struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
389 u16 days = 0;
390 u8 day0, day1;
391 unsigned long flags;
392
393 spin_lock_irqsave(&davinci_rtc_lock, flags);
394
395 davinci_rtcss_calendar_wait(davinci_rtc);
396 alm->time.tm_min = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_AMIN));
397
398 davinci_rtcss_calendar_wait(davinci_rtc);
399 alm->time.tm_hour = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_AHOUR));
400
401 davinci_rtcss_calendar_wait(davinci_rtc);
402 day0 = rtcss_read(davinci_rtc, PRTCSS_RTC_ADAY0);
403
404 davinci_rtcss_calendar_wait(davinci_rtc);
405 day1 = rtcss_read(davinci_rtc, PRTCSS_RTC_ADAY1);
406
407 spin_unlock_irqrestore(&davinci_rtc_lock, flags);
408 days |= day1;
409 days <<= 8;
410 days |= day0;
411
412 if (convertfromdays(days, &alm->time) < 0)
413 return -EINVAL;
414
415 alm->pending = !!(rtcss_read(davinci_rtc,
416 PRTCSS_RTC_CCTRL) &
417 PRTCSS_RTC_CCTRL_AIEN);
418 alm->enabled = alm->pending && device_may_wakeup(dev);
419
420 return 0;
421}
422
423static int davinci_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
424{
425 struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
426 unsigned long flags;
427 u16 days;
428
429 if (alm->time.tm_mday <= 0 && alm->time.tm_mon < 0
430 && alm->time.tm_year < 0) {
431 struct rtc_time tm;
432 unsigned long now, then;
433
434 davinci_rtc_read_time(dev, &tm);
435 rtc_tm_to_time(&tm, &now);
436
437 alm->time.tm_mday = tm.tm_mday;
438 alm->time.tm_mon = tm.tm_mon;
439 alm->time.tm_year = tm.tm_year;
440 rtc_tm_to_time(&alm->time, &then);
441
442 if (then < now) {
443 rtc_time_to_tm(now + 24 * 60 * 60, &tm);
444 alm->time.tm_mday = tm.tm_mday;
445 alm->time.tm_mon = tm.tm_mon;
446 alm->time.tm_year = tm.tm_year;
447 }
448 }
449
450 if (convert2days(&days, &alm->time) < 0)
451 return -EINVAL;
452
453 spin_lock_irqsave(&davinci_rtc_lock, flags);
454
455 davinci_rtcss_calendar_wait(davinci_rtc);
456 rtcss_write(davinci_rtc, bin2bcd(alm->time.tm_min), PRTCSS_RTC_AMIN);
457
458 davinci_rtcss_calendar_wait(davinci_rtc);
459 rtcss_write(davinci_rtc, bin2bcd(alm->time.tm_hour), PRTCSS_RTC_AHOUR);
460
461 davinci_rtcss_calendar_wait(davinci_rtc);
462 rtcss_write(davinci_rtc, days & 0xFF, PRTCSS_RTC_ADAY0);
463
464 davinci_rtcss_calendar_wait(davinci_rtc);
465 rtcss_write(davinci_rtc, (days & 0xFF00) >> 8, PRTCSS_RTC_ADAY1);
466
467 spin_unlock_irqrestore(&davinci_rtc_lock, flags);
468
469 return 0;
470}
471
472static struct rtc_class_ops davinci_rtc_ops = {
473 .ioctl = davinci_rtc_ioctl,
474 .read_time = davinci_rtc_read_time,
475 .set_time = davinci_rtc_set_time,
476 .alarm_irq_enable = davinci_rtc_alarm_irq_enable,
477 .read_alarm = davinci_rtc_read_alarm,
478 .set_alarm = davinci_rtc_set_alarm,
479};
480
481static int __init davinci_rtc_probe(struct platform_device *pdev)
482{
483 struct device *dev = &pdev->dev;
484 struct davinci_rtc *davinci_rtc;
485 struct resource *res, *mem;
486 int ret = 0;
487
488 davinci_rtc = devm_kzalloc(&pdev->dev, sizeof(struct davinci_rtc), GFP_KERNEL);
489 if (!davinci_rtc) {
490 dev_dbg(dev, "could not allocate memory for private data\n");
491 return -ENOMEM;
492 }
493
494 davinci_rtc->irq = platform_get_irq(pdev, 0);
495 if (davinci_rtc->irq < 0) {
496 dev_err(dev, "no RTC irq\n");
497 return davinci_rtc->irq;
498 }
499
500 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
501 if (!res) {
502 dev_err(dev, "no mem resource\n");
503 return -EINVAL;
504 }
505
506 davinci_rtc->pbase = res->start;
507 davinci_rtc->base_size = resource_size(res);
508
509 mem = devm_request_mem_region(dev, davinci_rtc->pbase,
510 davinci_rtc->base_size, pdev->name);
511 if (!mem) {
512 dev_err(dev, "RTC registers at %08x are not free\n",
513 davinci_rtc->pbase);
514 return -EBUSY;
515 }
516
517 davinci_rtc->base = devm_ioremap(dev, davinci_rtc->pbase,
518 davinci_rtc->base_size);
519 if (!davinci_rtc->base) {
520 dev_err(dev, "unable to ioremap MEM resource\n");
521 return -ENOMEM;
522 }
523
524 platform_set_drvdata(pdev, davinci_rtc);
525
526 davinci_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
527 &davinci_rtc_ops, THIS_MODULE);
528 if (IS_ERR(davinci_rtc->rtc)) {
529 ret = PTR_ERR(davinci_rtc->rtc);
530 dev_err(dev, "unable to register RTC device, err %d\n",
531 ret);
532 goto fail1;
533 }
534
535 rtcif_write(davinci_rtc, PRTCIF_INTFLG_RTCSS, PRTCIF_INTFLG);
536 rtcif_write(davinci_rtc, 0, PRTCIF_INTEN);
537 rtcss_write(davinci_rtc, 0, PRTCSS_RTC_INTC_EXTENA1);
538
539 rtcss_write(davinci_rtc, 0, PRTCSS_RTC_CTRL);
540 rtcss_write(davinci_rtc, 0, PRTCSS_RTC_CCTRL);
541
542 ret = devm_request_irq(dev, davinci_rtc->irq, davinci_rtc_interrupt,
543 0, "davinci_rtc", davinci_rtc);
544 if (ret < 0) {
545 dev_err(dev, "unable to register davinci RTC interrupt\n");
546 goto fail1;
547 }
548
549
550 rtcif_write(davinci_rtc, PRTCIF_INTEN_RTCSS, PRTCIF_INTEN);
551 rtcss_write(davinci_rtc, PRTCSS_RTC_INTC_EXTENA1_MASK,
552 PRTCSS_RTC_INTC_EXTENA1);
553
554 rtcss_write(davinci_rtc, PRTCSS_RTC_CCTRL_CAEN, PRTCSS_RTC_CCTRL);
555
556 device_init_wakeup(&pdev->dev, 0);
557
558 return 0;
559
560fail1:
561 platform_set_drvdata(pdev, NULL);
562 return ret;
563}
564
565static int __exit davinci_rtc_remove(struct platform_device *pdev)
566{
567 struct davinci_rtc *davinci_rtc = platform_get_drvdata(pdev);
568
569 device_init_wakeup(&pdev->dev, 0);
570
571 rtcif_write(davinci_rtc, 0, PRTCIF_INTEN);
572
573 platform_set_drvdata(pdev, NULL);
574
575 return 0;
576}
577
578static struct platform_driver davinci_rtc_driver = {
579 .probe = davinci_rtc_probe,
580 .remove = __exit_p(davinci_rtc_remove),
581 .driver = {
582 .name = "rtc_davinci",
583 .owner = THIS_MODULE,
584 },
585};
586
587module_platform_driver_probe(davinci_rtc_driver, davinci_rtc_probe);
588
589MODULE_AUTHOR("Miguel Aguilar <miguel.aguilar@ridgerun.com>");
590MODULE_DESCRIPTION("Texas Instruments DaVinci PRTC Driver");
591MODULE_LICENSE("GPL");
592
