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1/*
2 * rtc-twl.c -- TWL Real Time Clock interface
3 *
4 * Copyright (C) 2007 MontaVista Software, Inc
5 * Author: Alexandre Rusev <source@mvista.com>
6 *
7 * Based on original TI driver twl4030-rtc.c
8 * Copyright (C) 2006 Texas Instruments, Inc.
9 *
10 * Based on rtc-omap.c
11 * Copyright (C) 2003 MontaVista Software, Inc.
12 * Author: George G. Davis <gdavis@mvista.com> or <source@mvista.com>
13 * Copyright (C) 2006 David Brownell
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 */
20
21#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23#include <linux/kernel.h>
24#include <linux/errno.h>
25#include <linux/init.h>
26#include <linux/module.h>
27#include <linux/types.h>
28#include <linux/rtc.h>
29#include <linux/bcd.h>
30#include <linux/platform_device.h>
31#include <linux/interrupt.h>
32#include <linux/of.h>
33
34#include <linux/mfd/twl.h>
35
36enum twl_class {
37 TWL_4030 = 0,
38 TWL_6030,
39};
40
41/*
42 * RTC block register offsets (use TWL_MODULE_RTC)
43 */
44enum {
45 REG_SECONDS_REG = 0,
46 REG_MINUTES_REG,
47 REG_HOURS_REG,
48 REG_DAYS_REG,
49 REG_MONTHS_REG,
50 REG_YEARS_REG,
51 REG_WEEKS_REG,
52
53 REG_ALARM_SECONDS_REG,
54 REG_ALARM_MINUTES_REG,
55 REG_ALARM_HOURS_REG,
56 REG_ALARM_DAYS_REG,
57 REG_ALARM_MONTHS_REG,
58 REG_ALARM_YEARS_REG,
59
60 REG_RTC_CTRL_REG,
61 REG_RTC_STATUS_REG,
62 REG_RTC_INTERRUPTS_REG,
63
64 REG_RTC_COMP_LSB_REG,
65 REG_RTC_COMP_MSB_REG,
66};
67static const u8 twl4030_rtc_reg_map[] = {
68 [REG_SECONDS_REG] = 0x00,
69 [REG_MINUTES_REG] = 0x01,
70 [REG_HOURS_REG] = 0x02,
71 [REG_DAYS_REG] = 0x03,
72 [REG_MONTHS_REG] = 0x04,
73 [REG_YEARS_REG] = 0x05,
74 [REG_WEEKS_REG] = 0x06,
75
76 [REG_ALARM_SECONDS_REG] = 0x07,
77 [REG_ALARM_MINUTES_REG] = 0x08,
78 [REG_ALARM_HOURS_REG] = 0x09,
79 [REG_ALARM_DAYS_REG] = 0x0A,
80 [REG_ALARM_MONTHS_REG] = 0x0B,
81 [REG_ALARM_YEARS_REG] = 0x0C,
82
83 [REG_RTC_CTRL_REG] = 0x0D,
84 [REG_RTC_STATUS_REG] = 0x0E,
85 [REG_RTC_INTERRUPTS_REG] = 0x0F,
86
87 [REG_RTC_COMP_LSB_REG] = 0x10,
88 [REG_RTC_COMP_MSB_REG] = 0x11,
89};
90static const u8 twl6030_rtc_reg_map[] = {
91 [REG_SECONDS_REG] = 0x00,
92 [REG_MINUTES_REG] = 0x01,
93 [REG_HOURS_REG] = 0x02,
94 [REG_DAYS_REG] = 0x03,
95 [REG_MONTHS_REG] = 0x04,
96 [REG_YEARS_REG] = 0x05,
97 [REG_WEEKS_REG] = 0x06,
98
99 [REG_ALARM_SECONDS_REG] = 0x08,
100 [REG_ALARM_MINUTES_REG] = 0x09,
101 [REG_ALARM_HOURS_REG] = 0x0A,
102 [REG_ALARM_DAYS_REG] = 0x0B,
103 [REG_ALARM_MONTHS_REG] = 0x0C,
104 [REG_ALARM_YEARS_REG] = 0x0D,
105
106 [REG_RTC_CTRL_REG] = 0x10,
107 [REG_RTC_STATUS_REG] = 0x11,
108 [REG_RTC_INTERRUPTS_REG] = 0x12,
109
110 [REG_RTC_COMP_LSB_REG] = 0x13,
111 [REG_RTC_COMP_MSB_REG] = 0x14,
112};
113
114/* RTC_CTRL_REG bitfields */
115#define BIT_RTC_CTRL_REG_STOP_RTC_M 0x01
116#define BIT_RTC_CTRL_REG_ROUND_30S_M 0x02
117#define BIT_RTC_CTRL_REG_AUTO_COMP_M 0x04
118#define BIT_RTC_CTRL_REG_MODE_12_24_M 0x08
119#define BIT_RTC_CTRL_REG_TEST_MODE_M 0x10
120#define BIT_RTC_CTRL_REG_SET_32_COUNTER_M 0x20
121#define BIT_RTC_CTRL_REG_GET_TIME_M 0x40
122#define BIT_RTC_CTRL_REG_RTC_V_OPT 0x80
123
124/* RTC_STATUS_REG bitfields */
125#define BIT_RTC_STATUS_REG_RUN_M 0x02
126#define BIT_RTC_STATUS_REG_1S_EVENT_M 0x04
127#define BIT_RTC_STATUS_REG_1M_EVENT_M 0x08
128#define BIT_RTC_STATUS_REG_1H_EVENT_M 0x10
129#define BIT_RTC_STATUS_REG_1D_EVENT_M 0x20
130#define BIT_RTC_STATUS_REG_ALARM_M 0x40
131#define BIT_RTC_STATUS_REG_POWER_UP_M 0x80
132
133/* RTC_INTERRUPTS_REG bitfields */
134#define BIT_RTC_INTERRUPTS_REG_EVERY_M 0x03
135#define BIT_RTC_INTERRUPTS_REG_IT_TIMER_M 0x04
136#define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M 0x08
137
138
139/* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */
140#define ALL_TIME_REGS 6
141
142/*----------------------------------------------------------------------*/
143struct twl_rtc {
144 struct device *dev;
145 struct rtc_device *rtc;
146 u8 *reg_map;
147 /*
148 * Cache the value for timer/alarm interrupts register; this is
149 * only changed by callers holding rtc ops lock (or resume).
150 */
151 unsigned char rtc_irq_bits;
152 bool wake_enabled;
153#ifdef CONFIG_PM_SLEEP
154 unsigned char irqstat;
155#endif
156 enum twl_class class;
157};
158
159/*
160 * Supports 1 byte read from TWL RTC register.
161 */
162static int twl_rtc_read_u8(struct twl_rtc *twl_rtc, u8 *data, u8 reg)
163{
164 int ret;
165
166 ret = twl_i2c_read_u8(TWL_MODULE_RTC, data, (twl_rtc->reg_map[reg]));
167 if (ret < 0)
168 pr_err("Could not read TWL register %X - error %d\n", reg, ret);
169 return ret;
170}
171
172/*
173 * Supports 1 byte write to TWL RTC registers.
174 */
175static int twl_rtc_write_u8(struct twl_rtc *twl_rtc, u8 data, u8 reg)
176{
177 int ret;
178
179 ret = twl_i2c_write_u8(TWL_MODULE_RTC, data, (twl_rtc->reg_map[reg]));
180 if (ret < 0)
181 pr_err("Could not write TWL register %X - error %d\n",
182 reg, ret);
183 return ret;
184}
185
186/*
187 * Enable 1/second update and/or alarm interrupts.
188 */
189static int set_rtc_irq_bit(struct twl_rtc *twl_rtc, unsigned char bit)
190{
191 unsigned char val;
192 int ret;
193
194 /* if the bit is set, return from here */
195 if (twl_rtc->rtc_irq_bits & bit)
196 return 0;
197
198 val = twl_rtc->rtc_irq_bits | bit;
199 val &= ~BIT_RTC_INTERRUPTS_REG_EVERY_M;
200 ret = twl_rtc_write_u8(twl_rtc, val, REG_RTC_INTERRUPTS_REG);
201 if (ret == 0)
202 twl_rtc->rtc_irq_bits = val;
203
204 return ret;
205}
206
207/*
208 * Disable update and/or alarm interrupts.
209 */
210static int mask_rtc_irq_bit(struct twl_rtc *twl_rtc, unsigned char bit)
211{
212 unsigned char val;
213 int ret;
214
215 /* if the bit is clear, return from here */
216 if (!(twl_rtc->rtc_irq_bits & bit))
217 return 0;
218
219 val = twl_rtc->rtc_irq_bits & ~bit;
220 ret = twl_rtc_write_u8(twl_rtc, val, REG_RTC_INTERRUPTS_REG);
221 if (ret == 0)
222 twl_rtc->rtc_irq_bits = val;
223
224 return ret;
225}
226
227static int twl_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
228{
229 struct platform_device *pdev = to_platform_device(dev);
230 struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
231 int irq = platform_get_irq(pdev, 0);
232 int ret;
233
234 if (enabled) {
235 ret = set_rtc_irq_bit(twl_rtc,
236 BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
237 if (device_can_wakeup(dev) && !twl_rtc->wake_enabled) {
238 enable_irq_wake(irq);
239 twl_rtc->wake_enabled = true;
240 }
241 } else {
242 ret = mask_rtc_irq_bit(twl_rtc,
243 BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
244 if (twl_rtc->wake_enabled) {
245 disable_irq_wake(irq);
246 twl_rtc->wake_enabled = false;
247 }
248 }
249
250 return ret;
251}
252
253/*
254 * Gets current TWL RTC time and date parameters.
255 *
256 * The RTC's time/alarm representation is not what gmtime(3) requires
257 * Linux to use:
258 *
259 * - Months are 1..12 vs Linux 0-11
260 * - Years are 0..99 vs Linux 1900..N (we assume 21st century)
261 */
262static int twl_rtc_read_time(struct device *dev, struct rtc_time *tm)
263{
264 struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
265 unsigned char rtc_data[ALL_TIME_REGS];
266 int ret;
267 u8 save_control;
268 u8 rtc_control;
269
270 ret = twl_rtc_read_u8(twl_rtc, &save_control, REG_RTC_CTRL_REG);
271 if (ret < 0) {
272 dev_err(dev, "%s: reading CTRL_REG, error %d\n", __func__, ret);
273 return ret;
274 }
275 /* for twl6030/32 make sure BIT_RTC_CTRL_REG_GET_TIME_M is clear */
276 if (twl_rtc->class == TWL_6030) {
277 if (save_control & BIT_RTC_CTRL_REG_GET_TIME_M) {
278 save_control &= ~BIT_RTC_CTRL_REG_GET_TIME_M;
279 ret = twl_rtc_write_u8(twl_rtc, save_control,
280 REG_RTC_CTRL_REG);
281 if (ret < 0) {
282 dev_err(dev, "%s clr GET_TIME, error %d\n",
283 __func__, ret);
284 return ret;
285 }
286 }
287 }
288
289 /* Copy RTC counting registers to static registers or latches */
290 rtc_control = save_control | BIT_RTC_CTRL_REG_GET_TIME_M;
291
292 /* for twl6030/32 enable read access to static shadowed registers */
293 if (twl_rtc->class == TWL_6030)
294 rtc_control |= BIT_RTC_CTRL_REG_RTC_V_OPT;
295
296 ret = twl_rtc_write_u8(twl_rtc, rtc_control, REG_RTC_CTRL_REG);
297 if (ret < 0) {
298 dev_err(dev, "%s: writing CTRL_REG, error %d\n", __func__, ret);
299 return ret;
300 }
301
302 ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
303 (twl_rtc->reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
304
305 if (ret < 0) {
306 dev_err(dev, "%s: reading data, error %d\n", __func__, ret);
307 return ret;
308 }
309
310 /* for twl6030 restore original state of rtc control register */
311 if (twl_rtc->class == TWL_6030) {
312 ret = twl_rtc_write_u8(twl_rtc, save_control, REG_RTC_CTRL_REG);
313 if (ret < 0) {
314 dev_err(dev, "%s: restore CTRL_REG, error %d\n",
315 __func__, ret);
316 return ret;
317 }
318 }
319
320 tm->tm_sec = bcd2bin(rtc_data[0]);
321 tm->tm_min = bcd2bin(rtc_data[1]);
322 tm->tm_hour = bcd2bin(rtc_data[2]);
323 tm->tm_mday = bcd2bin(rtc_data[3]);
324 tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
325 tm->tm_year = bcd2bin(rtc_data[5]) + 100;
326
327 return ret;
328}
329
330static int twl_rtc_set_time(struct device *dev, struct rtc_time *tm)
331{
332 struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
333 unsigned char save_control;
334 unsigned char rtc_data[ALL_TIME_REGS];
335 int ret;
336
337 rtc_data[0] = bin2bcd(tm->tm_sec);
338 rtc_data[1] = bin2bcd(tm->tm_min);
339 rtc_data[2] = bin2bcd(tm->tm_hour);
340 rtc_data[3] = bin2bcd(tm->tm_mday);
341 rtc_data[4] = bin2bcd(tm->tm_mon + 1);
342 rtc_data[5] = bin2bcd(tm->tm_year - 100);
343
344 /* Stop RTC while updating the TC registers */
345 ret = twl_rtc_read_u8(twl_rtc, &save_control, REG_RTC_CTRL_REG);
346 if (ret < 0)
347 goto out;
348
349 save_control &= ~BIT_RTC_CTRL_REG_STOP_RTC_M;
350 ret = twl_rtc_write_u8(twl_rtc, save_control, REG_RTC_CTRL_REG);
351 if (ret < 0)
352 goto out;
353
354 /* update all the time registers in one shot */
355 ret = twl_i2c_write(TWL_MODULE_RTC, rtc_data,
356 (twl_rtc->reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
357 if (ret < 0) {
358 dev_err(dev, "rtc_set_time error %d\n", ret);
359 goto out;
360 }
361
362 /* Start back RTC */
363 save_control |= BIT_RTC_CTRL_REG_STOP_RTC_M;
364 ret = twl_rtc_write_u8(twl_rtc, save_control, REG_RTC_CTRL_REG);
365
366out:
367 return ret;
368}
369
370/*
371 * Gets current TWL RTC alarm time.
372 */
373static int twl_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
374{
375 struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
376 unsigned char rtc_data[ALL_TIME_REGS];
377 int ret;
378
379 ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
380 twl_rtc->reg_map[REG_ALARM_SECONDS_REG], ALL_TIME_REGS);
381 if (ret < 0) {
382 dev_err(dev, "rtc_read_alarm error %d\n", ret);
383 return ret;
384 }
385
386 /* some of these fields may be wildcard/"match all" */
387 alm->time.tm_sec = bcd2bin(rtc_data[0]);
388 alm->time.tm_min = bcd2bin(rtc_data[1]);
389 alm->time.tm_hour = bcd2bin(rtc_data[2]);
390 alm->time.tm_mday = bcd2bin(rtc_data[3]);
391 alm->time.tm_mon = bcd2bin(rtc_data[4]) - 1;
392 alm->time.tm_year = bcd2bin(rtc_data[5]) + 100;
393
394 /* report cached alarm enable state */
395 if (twl_rtc->rtc_irq_bits & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M)
396 alm->enabled = 1;
397
398 return ret;
399}
400
401static int twl_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
402{
403 struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
404
405 unsigned char alarm_data[ALL_TIME_REGS];
406 int ret;
407
408 ret = twl_rtc_alarm_irq_enable(dev, 0);
409 if (ret)
410 goto out;
411
412 alarm_data[0] = bin2bcd(alm->time.tm_sec);
413 alarm_data[1] = bin2bcd(alm->time.tm_min);
414 alarm_data[2] = bin2bcd(alm->time.tm_hour);
415 alarm_data[3] = bin2bcd(alm->time.tm_mday);
416 alarm_data[4] = bin2bcd(alm->time.tm_mon + 1);
417 alarm_data[5] = bin2bcd(alm->time.tm_year - 100);
418
419 /* update all the alarm registers in one shot */
420 ret = twl_i2c_write(TWL_MODULE_RTC, alarm_data,
421 twl_rtc->reg_map[REG_ALARM_SECONDS_REG], ALL_TIME_REGS);
422 if (ret) {
423 dev_err(dev, "rtc_set_alarm error %d\n", ret);
424 goto out;
425 }
426
427 if (alm->enabled)
428 ret = twl_rtc_alarm_irq_enable(dev, 1);
429out:
430 return ret;
431}
432
433static irqreturn_t twl_rtc_interrupt(int irq, void *data)
434{
435 struct twl_rtc *twl_rtc = data;
436 unsigned long events;
437 int ret = IRQ_NONE;
438 int res;
439 u8 rd_reg;
440
441 res = twl_rtc_read_u8(twl_rtc, &rd_reg, REG_RTC_STATUS_REG);
442 if (res)
443 goto out;
444 /*
445 * Figure out source of interrupt: ALARM or TIMER in RTC_STATUS_REG.
446 * only one (ALARM or RTC) interrupt source may be enabled
447 * at time, we also could check our results
448 * by reading RTS_INTERRUPTS_REGISTER[IT_TIMER,IT_ALARM]
449 */
450 if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
451 events = RTC_IRQF | RTC_AF;
452 else
453 events = RTC_IRQF | RTC_PF;
454
455 res = twl_rtc_write_u8(twl_rtc, BIT_RTC_STATUS_REG_ALARM_M,
456 REG_RTC_STATUS_REG);
457 if (res)
458 goto out;
459
460 if (twl_rtc->class == TWL_4030) {
461 /* Clear on Read enabled. RTC_IT bit of TWL4030_INT_PWR_ISR1
462 * needs 2 reads to clear the interrupt. One read is done in
463 * do_twl_pwrirq(). Doing the second read, to clear
464 * the bit.
465 *
466 * FIXME the reason PWR_ISR1 needs an extra read is that
467 * RTC_IF retriggered until we cleared REG_ALARM_M above.
468 * But re-reading like this is a bad hack; by doing so we
469 * risk wrongly clearing status for some other IRQ (losing
470 * the interrupt). Be smarter about handling RTC_UF ...
471 */
472 res = twl_i2c_read_u8(TWL4030_MODULE_INT,
473 &rd_reg, TWL4030_INT_PWR_ISR1);
474 if (res)
475 goto out;
476 }
477
478 /* Notify RTC core on event */
479 rtc_update_irq(twl_rtc->rtc, 1, events);
480
481 ret = IRQ_HANDLED;
482out:
483 return ret;
484}
485
486static const struct rtc_class_ops twl_rtc_ops = {
487 .read_time = twl_rtc_read_time,
488 .set_time = twl_rtc_set_time,
489 .read_alarm = twl_rtc_read_alarm,
490 .set_alarm = twl_rtc_set_alarm,
491 .alarm_irq_enable = twl_rtc_alarm_irq_enable,
492};
493
494/*----------------------------------------------------------------------*/
495
496static int twl_rtc_probe(struct platform_device *pdev)
497{
498 struct twl_rtc *twl_rtc;
499 struct device_node *np = pdev->dev.of_node;
500 int ret = -EINVAL;
501 int irq = platform_get_irq(pdev, 0);
502 u8 rd_reg;
503
504 if (!np) {
505 dev_err(&pdev->dev, "no DT info\n");
506 return -EINVAL;
507 }
508
509 if (irq <= 0)
510 return ret;
511
512 twl_rtc = devm_kzalloc(&pdev->dev, sizeof(*twl_rtc), GFP_KERNEL);
513 if (!twl_rtc)
514 return -ENOMEM;
515
516 if (twl_class_is_4030()) {
517 twl_rtc->class = TWL_4030;
518 twl_rtc->reg_map = (u8 *)twl4030_rtc_reg_map;
519 } else if (twl_class_is_6030()) {
520 twl_rtc->class = TWL_6030;
521 twl_rtc->reg_map = (u8 *)twl6030_rtc_reg_map;
522 } else {
523 dev_err(&pdev->dev, "TWL Class not supported.\n");
524 return -EINVAL;
525 }
526
527 ret = twl_rtc_read_u8(twl_rtc, &rd_reg, REG_RTC_STATUS_REG);
528 if (ret < 0)
529 return ret;
530
531 if (rd_reg & BIT_RTC_STATUS_REG_POWER_UP_M)
532 dev_warn(&pdev->dev, "Power up reset detected.\n");
533
534 if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
535 dev_warn(&pdev->dev, "Pending Alarm interrupt detected.\n");
536
537 /* Clear RTC Power up reset and pending alarm interrupts */
538 ret = twl_rtc_write_u8(twl_rtc, rd_reg, REG_RTC_STATUS_REG);
539 if (ret < 0)
540 return ret;
541
542 if (twl_rtc->class == TWL_6030) {
543 twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
544 REG_INT_MSK_LINE_A);
545 twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
546 REG_INT_MSK_STS_A);
547 }
548
549 dev_info(&pdev->dev, "Enabling TWL-RTC\n");
550 ret = twl_rtc_write_u8(twl_rtc, BIT_RTC_CTRL_REG_STOP_RTC_M,
551 REG_RTC_CTRL_REG);
552 if (ret < 0)
553 return ret;
554
555 /* ensure interrupts are disabled, bootloaders can be strange */
556 ret = twl_rtc_write_u8(twl_rtc, 0, REG_RTC_INTERRUPTS_REG);
557 if (ret < 0)
558 dev_warn(&pdev->dev, "unable to disable interrupt\n");
559
560 /* init cached IRQ enable bits */
561 ret = twl_rtc_read_u8(twl_rtc, &twl_rtc->rtc_irq_bits,
562 REG_RTC_INTERRUPTS_REG);
563 if (ret < 0)
564 return ret;
565
566 platform_set_drvdata(pdev, twl_rtc);
567 device_init_wakeup(&pdev->dev, 1);
568
569 twl_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
570 &twl_rtc_ops, THIS_MODULE);
571 if (IS_ERR(twl_rtc->rtc)) {
572 dev_err(&pdev->dev, "can't register RTC device, err %ld\n",
573 PTR_ERR(twl_rtc->rtc));
574 return PTR_ERR(twl_rtc->rtc);
575 }
576
577 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
578 twl_rtc_interrupt,
579 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
580 dev_name(&twl_rtc->rtc->dev), twl_rtc);
581 if (ret < 0) {
582 dev_err(&pdev->dev, "IRQ is not free.\n");
583 return ret;
584 }
585
586 return 0;
587}
588
589/*
590 * Disable all TWL RTC module interrupts.
591 * Sets status flag to free.
592 */
593static int twl_rtc_remove(struct platform_device *pdev)
594{
595 struct twl_rtc *twl_rtc = platform_get_drvdata(pdev);
596
597 /* leave rtc running, but disable irqs */
598 mask_rtc_irq_bit(twl_rtc, BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
599 mask_rtc_irq_bit(twl_rtc, BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
600 if (twl_rtc->class == TWL_6030) {
601 twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
602 REG_INT_MSK_LINE_A);
603 twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
604 REG_INT_MSK_STS_A);
605 }
606
607 return 0;
608}
609
610static void twl_rtc_shutdown(struct platform_device *pdev)
611{
612 struct twl_rtc *twl_rtc = platform_get_drvdata(pdev);
613
614 /* mask timer interrupts, but leave alarm interrupts on to enable
615 power-on when alarm is triggered */
616 mask_rtc_irq_bit(twl_rtc, BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
617}
618
619#ifdef CONFIG_PM_SLEEP
620static int twl_rtc_suspend(struct device *dev)
621{
622 struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
623
624 twl_rtc->irqstat = twl_rtc->rtc_irq_bits;
625
626 mask_rtc_irq_bit(twl_rtc, BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
627 return 0;
628}
629
630static int twl_rtc_resume(struct device *dev)
631{
632 struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
633
634 set_rtc_irq_bit(twl_rtc, twl_rtc->irqstat);
635 return 0;
636}
637#endif
638
639static SIMPLE_DEV_PM_OPS(twl_rtc_pm_ops, twl_rtc_suspend, twl_rtc_resume);
640
641static const struct of_device_id twl_rtc_of_match[] = {
642 {.compatible = "ti,twl4030-rtc", },
643 { },
644};
645MODULE_DEVICE_TABLE(of, twl_rtc_of_match);
646
647static struct platform_driver twl4030rtc_driver = {
648 .probe = twl_rtc_probe,
649 .remove = twl_rtc_remove,
650 .shutdown = twl_rtc_shutdown,
651 .driver = {
652 .name = "twl_rtc",
653 .pm = &twl_rtc_pm_ops,
654 .of_match_table = twl_rtc_of_match,
655 },
656};
657
658module_platform_driver(twl4030rtc_driver);
659
660MODULE_AUTHOR("Texas Instruments, MontaVista Software");
661MODULE_LICENSE("GPL");
1/*
2 * rtc-twl.c -- TWL Real Time Clock interface
3 *
4 * Copyright (C) 2007 MontaVista Software, Inc
5 * Author: Alexandre Rusev <source@mvista.com>
6 *
7 * Based on original TI driver twl4030-rtc.c
8 * Copyright (C) 2006 Texas Instruments, Inc.
9 *
10 * Based on rtc-omap.c
11 * Copyright (C) 2003 MontaVista Software, Inc.
12 * Author: George G. Davis <gdavis@mvista.com> or <source@mvista.com>
13 * Copyright (C) 2006 David Brownell
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 */
20
21#include <linux/kernel.h>
22#include <linux/errno.h>
23#include <linux/init.h>
24#include <linux/module.h>
25#include <linux/types.h>
26#include <linux/rtc.h>
27#include <linux/bcd.h>
28#include <linux/platform_device.h>
29#include <linux/interrupt.h>
30#include <linux/of.h>
31
32#include <linux/i2c/twl.h>
33
34
35/*
36 * RTC block register offsets (use TWL_MODULE_RTC)
37 */
38enum {
39 REG_SECONDS_REG = 0,
40 REG_MINUTES_REG,
41 REG_HOURS_REG,
42 REG_DAYS_REG,
43 REG_MONTHS_REG,
44 REG_YEARS_REG,
45 REG_WEEKS_REG,
46
47 REG_ALARM_SECONDS_REG,
48 REG_ALARM_MINUTES_REG,
49 REG_ALARM_HOURS_REG,
50 REG_ALARM_DAYS_REG,
51 REG_ALARM_MONTHS_REG,
52 REG_ALARM_YEARS_REG,
53
54 REG_RTC_CTRL_REG,
55 REG_RTC_STATUS_REG,
56 REG_RTC_INTERRUPTS_REG,
57
58 REG_RTC_COMP_LSB_REG,
59 REG_RTC_COMP_MSB_REG,
60};
61static const u8 twl4030_rtc_reg_map[] = {
62 [REG_SECONDS_REG] = 0x00,
63 [REG_MINUTES_REG] = 0x01,
64 [REG_HOURS_REG] = 0x02,
65 [REG_DAYS_REG] = 0x03,
66 [REG_MONTHS_REG] = 0x04,
67 [REG_YEARS_REG] = 0x05,
68 [REG_WEEKS_REG] = 0x06,
69
70 [REG_ALARM_SECONDS_REG] = 0x07,
71 [REG_ALARM_MINUTES_REG] = 0x08,
72 [REG_ALARM_HOURS_REG] = 0x09,
73 [REG_ALARM_DAYS_REG] = 0x0A,
74 [REG_ALARM_MONTHS_REG] = 0x0B,
75 [REG_ALARM_YEARS_REG] = 0x0C,
76
77 [REG_RTC_CTRL_REG] = 0x0D,
78 [REG_RTC_STATUS_REG] = 0x0E,
79 [REG_RTC_INTERRUPTS_REG] = 0x0F,
80
81 [REG_RTC_COMP_LSB_REG] = 0x10,
82 [REG_RTC_COMP_MSB_REG] = 0x11,
83};
84static const u8 twl6030_rtc_reg_map[] = {
85 [REG_SECONDS_REG] = 0x00,
86 [REG_MINUTES_REG] = 0x01,
87 [REG_HOURS_REG] = 0x02,
88 [REG_DAYS_REG] = 0x03,
89 [REG_MONTHS_REG] = 0x04,
90 [REG_YEARS_REG] = 0x05,
91 [REG_WEEKS_REG] = 0x06,
92
93 [REG_ALARM_SECONDS_REG] = 0x08,
94 [REG_ALARM_MINUTES_REG] = 0x09,
95 [REG_ALARM_HOURS_REG] = 0x0A,
96 [REG_ALARM_DAYS_REG] = 0x0B,
97 [REG_ALARM_MONTHS_REG] = 0x0C,
98 [REG_ALARM_YEARS_REG] = 0x0D,
99
100 [REG_RTC_CTRL_REG] = 0x10,
101 [REG_RTC_STATUS_REG] = 0x11,
102 [REG_RTC_INTERRUPTS_REG] = 0x12,
103
104 [REG_RTC_COMP_LSB_REG] = 0x13,
105 [REG_RTC_COMP_MSB_REG] = 0x14,
106};
107
108/* RTC_CTRL_REG bitfields */
109#define BIT_RTC_CTRL_REG_STOP_RTC_M 0x01
110#define BIT_RTC_CTRL_REG_ROUND_30S_M 0x02
111#define BIT_RTC_CTRL_REG_AUTO_COMP_M 0x04
112#define BIT_RTC_CTRL_REG_MODE_12_24_M 0x08
113#define BIT_RTC_CTRL_REG_TEST_MODE_M 0x10
114#define BIT_RTC_CTRL_REG_SET_32_COUNTER_M 0x20
115#define BIT_RTC_CTRL_REG_GET_TIME_M 0x40
116#define BIT_RTC_CTRL_REG_RTC_V_OPT 0x80
117
118/* RTC_STATUS_REG bitfields */
119#define BIT_RTC_STATUS_REG_RUN_M 0x02
120#define BIT_RTC_STATUS_REG_1S_EVENT_M 0x04
121#define BIT_RTC_STATUS_REG_1M_EVENT_M 0x08
122#define BIT_RTC_STATUS_REG_1H_EVENT_M 0x10
123#define BIT_RTC_STATUS_REG_1D_EVENT_M 0x20
124#define BIT_RTC_STATUS_REG_ALARM_M 0x40
125#define BIT_RTC_STATUS_REG_POWER_UP_M 0x80
126
127/* RTC_INTERRUPTS_REG bitfields */
128#define BIT_RTC_INTERRUPTS_REG_EVERY_M 0x03
129#define BIT_RTC_INTERRUPTS_REG_IT_TIMER_M 0x04
130#define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M 0x08
131
132
133/* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */
134#define ALL_TIME_REGS 6
135
136/*----------------------------------------------------------------------*/
137static u8 *rtc_reg_map;
138
139/*
140 * Supports 1 byte read from TWL RTC register.
141 */
142static int twl_rtc_read_u8(u8 *data, u8 reg)
143{
144 int ret;
145
146 ret = twl_i2c_read_u8(TWL_MODULE_RTC, data, (rtc_reg_map[reg]));
147 if (ret < 0)
148 pr_err("twl_rtc: Could not read TWL"
149 "register %X - error %d\n", reg, ret);
150 return ret;
151}
152
153/*
154 * Supports 1 byte write to TWL RTC registers.
155 */
156static int twl_rtc_write_u8(u8 data, u8 reg)
157{
158 int ret;
159
160 ret = twl_i2c_write_u8(TWL_MODULE_RTC, data, (rtc_reg_map[reg]));
161 if (ret < 0)
162 pr_err("twl_rtc: Could not write TWL"
163 "register %X - error %d\n", reg, ret);
164 return ret;
165}
166
167/*
168 * Cache the value for timer/alarm interrupts register; this is
169 * only changed by callers holding rtc ops lock (or resume).
170 */
171static unsigned char rtc_irq_bits;
172
173/*
174 * Enable 1/second update and/or alarm interrupts.
175 */
176static int set_rtc_irq_bit(unsigned char bit)
177{
178 unsigned char val;
179 int ret;
180
181 /* if the bit is set, return from here */
182 if (rtc_irq_bits & bit)
183 return 0;
184
185 val = rtc_irq_bits | bit;
186 val &= ~BIT_RTC_INTERRUPTS_REG_EVERY_M;
187 ret = twl_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
188 if (ret == 0)
189 rtc_irq_bits = val;
190
191 return ret;
192}
193
194/*
195 * Disable update and/or alarm interrupts.
196 */
197static int mask_rtc_irq_bit(unsigned char bit)
198{
199 unsigned char val;
200 int ret;
201
202 /* if the bit is clear, return from here */
203 if (!(rtc_irq_bits & bit))
204 return 0;
205
206 val = rtc_irq_bits & ~bit;
207 ret = twl_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
208 if (ret == 0)
209 rtc_irq_bits = val;
210
211 return ret;
212}
213
214static int twl_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
215{
216 struct platform_device *pdev = to_platform_device(dev);
217 int irq = platform_get_irq(pdev, 0);
218 static bool twl_rtc_wake_enabled;
219 int ret;
220
221 if (enabled) {
222 ret = set_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
223 if (device_can_wakeup(dev) && !twl_rtc_wake_enabled) {
224 enable_irq_wake(irq);
225 twl_rtc_wake_enabled = true;
226 }
227 } else {
228 ret = mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
229 if (twl_rtc_wake_enabled) {
230 disable_irq_wake(irq);
231 twl_rtc_wake_enabled = false;
232 }
233 }
234
235 return ret;
236}
237
238/*
239 * Gets current TWL RTC time and date parameters.
240 *
241 * The RTC's time/alarm representation is not what gmtime(3) requires
242 * Linux to use:
243 *
244 * - Months are 1..12 vs Linux 0-11
245 * - Years are 0..99 vs Linux 1900..N (we assume 21st century)
246 */
247static int twl_rtc_read_time(struct device *dev, struct rtc_time *tm)
248{
249 unsigned char rtc_data[ALL_TIME_REGS];
250 int ret;
251 u8 save_control;
252 u8 rtc_control;
253
254 ret = twl_rtc_read_u8(&save_control, REG_RTC_CTRL_REG);
255 if (ret < 0) {
256 dev_err(dev, "%s: reading CTRL_REG, error %d\n", __func__, ret);
257 return ret;
258 }
259 /* for twl6030/32 make sure BIT_RTC_CTRL_REG_GET_TIME_M is clear */
260 if (twl_class_is_6030()) {
261 if (save_control & BIT_RTC_CTRL_REG_GET_TIME_M) {
262 save_control &= ~BIT_RTC_CTRL_REG_GET_TIME_M;
263 ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
264 if (ret < 0) {
265 dev_err(dev, "%s clr GET_TIME, error %d\n",
266 __func__, ret);
267 return ret;
268 }
269 }
270 }
271
272 /* Copy RTC counting registers to static registers or latches */
273 rtc_control = save_control | BIT_RTC_CTRL_REG_GET_TIME_M;
274
275 /* for twl6030/32 enable read access to static shadowed registers */
276 if (twl_class_is_6030())
277 rtc_control |= BIT_RTC_CTRL_REG_RTC_V_OPT;
278
279 ret = twl_rtc_write_u8(rtc_control, REG_RTC_CTRL_REG);
280 if (ret < 0) {
281 dev_err(dev, "%s: writing CTRL_REG, error %d\n", __func__, ret);
282 return ret;
283 }
284
285 ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
286 (rtc_reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
287
288 if (ret < 0) {
289 dev_err(dev, "%s: reading data, error %d\n", __func__, ret);
290 return ret;
291 }
292
293 /* for twl6030 restore original state of rtc control register */
294 if (twl_class_is_6030()) {
295 ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
296 if (ret < 0) {
297 dev_err(dev, "%s: restore CTRL_REG, error %d\n",
298 __func__, ret);
299 return ret;
300 }
301 }
302
303 tm->tm_sec = bcd2bin(rtc_data[0]);
304 tm->tm_min = bcd2bin(rtc_data[1]);
305 tm->tm_hour = bcd2bin(rtc_data[2]);
306 tm->tm_mday = bcd2bin(rtc_data[3]);
307 tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
308 tm->tm_year = bcd2bin(rtc_data[5]) + 100;
309
310 return ret;
311}
312
313static int twl_rtc_set_time(struct device *dev, struct rtc_time *tm)
314{
315 unsigned char save_control;
316 unsigned char rtc_data[ALL_TIME_REGS];
317 int ret;
318
319 rtc_data[0] = bin2bcd(tm->tm_sec);
320 rtc_data[1] = bin2bcd(tm->tm_min);
321 rtc_data[2] = bin2bcd(tm->tm_hour);
322 rtc_data[3] = bin2bcd(tm->tm_mday);
323 rtc_data[4] = bin2bcd(tm->tm_mon + 1);
324 rtc_data[5] = bin2bcd(tm->tm_year - 100);
325
326 /* Stop RTC while updating the TC registers */
327 ret = twl_rtc_read_u8(&save_control, REG_RTC_CTRL_REG);
328 if (ret < 0)
329 goto out;
330
331 save_control &= ~BIT_RTC_CTRL_REG_STOP_RTC_M;
332 ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
333 if (ret < 0)
334 goto out;
335
336 /* update all the time registers in one shot */
337 ret = twl_i2c_write(TWL_MODULE_RTC, rtc_data,
338 (rtc_reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
339 if (ret < 0) {
340 dev_err(dev, "rtc_set_time error %d\n", ret);
341 goto out;
342 }
343
344 /* Start back RTC */
345 save_control |= BIT_RTC_CTRL_REG_STOP_RTC_M;
346 ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
347
348out:
349 return ret;
350}
351
352/*
353 * Gets current TWL RTC alarm time.
354 */
355static int twl_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
356{
357 unsigned char rtc_data[ALL_TIME_REGS];
358 int ret;
359
360 ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
361 (rtc_reg_map[REG_ALARM_SECONDS_REG]), ALL_TIME_REGS);
362 if (ret < 0) {
363 dev_err(dev, "rtc_read_alarm error %d\n", ret);
364 return ret;
365 }
366
367 /* some of these fields may be wildcard/"match all" */
368 alm->time.tm_sec = bcd2bin(rtc_data[0]);
369 alm->time.tm_min = bcd2bin(rtc_data[1]);
370 alm->time.tm_hour = bcd2bin(rtc_data[2]);
371 alm->time.tm_mday = bcd2bin(rtc_data[3]);
372 alm->time.tm_mon = bcd2bin(rtc_data[4]) - 1;
373 alm->time.tm_year = bcd2bin(rtc_data[5]) + 100;
374
375 /* report cached alarm enable state */
376 if (rtc_irq_bits & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M)
377 alm->enabled = 1;
378
379 return ret;
380}
381
382static int twl_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
383{
384 unsigned char alarm_data[ALL_TIME_REGS];
385 int ret;
386
387 ret = twl_rtc_alarm_irq_enable(dev, 0);
388 if (ret)
389 goto out;
390
391 alarm_data[0] = bin2bcd(alm->time.tm_sec);
392 alarm_data[1] = bin2bcd(alm->time.tm_min);
393 alarm_data[2] = bin2bcd(alm->time.tm_hour);
394 alarm_data[3] = bin2bcd(alm->time.tm_mday);
395 alarm_data[4] = bin2bcd(alm->time.tm_mon + 1);
396 alarm_data[5] = bin2bcd(alm->time.tm_year - 100);
397
398 /* update all the alarm registers in one shot */
399 ret = twl_i2c_write(TWL_MODULE_RTC, alarm_data,
400 (rtc_reg_map[REG_ALARM_SECONDS_REG]), ALL_TIME_REGS);
401 if (ret) {
402 dev_err(dev, "rtc_set_alarm error %d\n", ret);
403 goto out;
404 }
405
406 if (alm->enabled)
407 ret = twl_rtc_alarm_irq_enable(dev, 1);
408out:
409 return ret;
410}
411
412static irqreturn_t twl_rtc_interrupt(int irq, void *rtc)
413{
414 unsigned long events;
415 int ret = IRQ_NONE;
416 int res;
417 u8 rd_reg;
418
419 res = twl_rtc_read_u8(&rd_reg, REG_RTC_STATUS_REG);
420 if (res)
421 goto out;
422 /*
423 * Figure out source of interrupt: ALARM or TIMER in RTC_STATUS_REG.
424 * only one (ALARM or RTC) interrupt source may be enabled
425 * at time, we also could check our results
426 * by reading RTS_INTERRUPTS_REGISTER[IT_TIMER,IT_ALARM]
427 */
428 if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
429 events = RTC_IRQF | RTC_AF;
430 else
431 events = RTC_IRQF | RTC_PF;
432
433 res = twl_rtc_write_u8(BIT_RTC_STATUS_REG_ALARM_M,
434 REG_RTC_STATUS_REG);
435 if (res)
436 goto out;
437
438 if (twl_class_is_4030()) {
439 /* Clear on Read enabled. RTC_IT bit of TWL4030_INT_PWR_ISR1
440 * needs 2 reads to clear the interrupt. One read is done in
441 * do_twl_pwrirq(). Doing the second read, to clear
442 * the bit.
443 *
444 * FIXME the reason PWR_ISR1 needs an extra read is that
445 * RTC_IF retriggered until we cleared REG_ALARM_M above.
446 * But re-reading like this is a bad hack; by doing so we
447 * risk wrongly clearing status for some other IRQ (losing
448 * the interrupt). Be smarter about handling RTC_UF ...
449 */
450 res = twl_i2c_read_u8(TWL4030_MODULE_INT,
451 &rd_reg, TWL4030_INT_PWR_ISR1);
452 if (res)
453 goto out;
454 }
455
456 /* Notify RTC core on event */
457 rtc_update_irq(rtc, 1, events);
458
459 ret = IRQ_HANDLED;
460out:
461 return ret;
462}
463
464static struct rtc_class_ops twl_rtc_ops = {
465 .read_time = twl_rtc_read_time,
466 .set_time = twl_rtc_set_time,
467 .read_alarm = twl_rtc_read_alarm,
468 .set_alarm = twl_rtc_set_alarm,
469 .alarm_irq_enable = twl_rtc_alarm_irq_enable,
470};
471
472/*----------------------------------------------------------------------*/
473
474static int twl_rtc_probe(struct platform_device *pdev)
475{
476 struct rtc_device *rtc;
477 int ret = -EINVAL;
478 int irq = platform_get_irq(pdev, 0);
479 u8 rd_reg;
480
481 if (irq <= 0)
482 return ret;
483
484 /* Initialize the register map */
485 if (twl_class_is_4030())
486 rtc_reg_map = (u8 *)twl4030_rtc_reg_map;
487 else
488 rtc_reg_map = (u8 *)twl6030_rtc_reg_map;
489
490 ret = twl_rtc_read_u8(&rd_reg, REG_RTC_STATUS_REG);
491 if (ret < 0)
492 return ret;
493
494 if (rd_reg & BIT_RTC_STATUS_REG_POWER_UP_M)
495 dev_warn(&pdev->dev, "Power up reset detected.\n");
496
497 if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
498 dev_warn(&pdev->dev, "Pending Alarm interrupt detected.\n");
499
500 /* Clear RTC Power up reset and pending alarm interrupts */
501 ret = twl_rtc_write_u8(rd_reg, REG_RTC_STATUS_REG);
502 if (ret < 0)
503 return ret;
504
505 if (twl_class_is_6030()) {
506 twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
507 REG_INT_MSK_LINE_A);
508 twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
509 REG_INT_MSK_STS_A);
510 }
511
512 dev_info(&pdev->dev, "Enabling TWL-RTC\n");
513 ret = twl_rtc_write_u8(BIT_RTC_CTRL_REG_STOP_RTC_M, REG_RTC_CTRL_REG);
514 if (ret < 0)
515 return ret;
516
517 /* ensure interrupts are disabled, bootloaders can be strange */
518 ret = twl_rtc_write_u8(0, REG_RTC_INTERRUPTS_REG);
519 if (ret < 0)
520 dev_warn(&pdev->dev, "unable to disable interrupt\n");
521
522 /* init cached IRQ enable bits */
523 ret = twl_rtc_read_u8(&rtc_irq_bits, REG_RTC_INTERRUPTS_REG);
524 if (ret < 0)
525 return ret;
526
527 device_init_wakeup(&pdev->dev, 1);
528
529 rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
530 &twl_rtc_ops, THIS_MODULE);
531 if (IS_ERR(rtc)) {
532 dev_err(&pdev->dev, "can't register RTC device, err %ld\n",
533 PTR_ERR(rtc));
534 return PTR_ERR(rtc);
535 }
536
537 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
538 twl_rtc_interrupt,
539 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
540 dev_name(&rtc->dev), rtc);
541 if (ret < 0) {
542 dev_err(&pdev->dev, "IRQ is not free.\n");
543 return ret;
544 }
545
546 platform_set_drvdata(pdev, rtc);
547 return 0;
548}
549
550/*
551 * Disable all TWL RTC module interrupts.
552 * Sets status flag to free.
553 */
554static int twl_rtc_remove(struct platform_device *pdev)
555{
556 /* leave rtc running, but disable irqs */
557 mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
558 mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
559 if (twl_class_is_6030()) {
560 twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
561 REG_INT_MSK_LINE_A);
562 twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
563 REG_INT_MSK_STS_A);
564 }
565
566 return 0;
567}
568
569static void twl_rtc_shutdown(struct platform_device *pdev)
570{
571 /* mask timer interrupts, but leave alarm interrupts on to enable
572 power-on when alarm is triggered */
573 mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
574}
575
576#ifdef CONFIG_PM_SLEEP
577static unsigned char irqstat;
578
579static int twl_rtc_suspend(struct device *dev)
580{
581 irqstat = rtc_irq_bits;
582
583 mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
584 return 0;
585}
586
587static int twl_rtc_resume(struct device *dev)
588{
589 set_rtc_irq_bit(irqstat);
590 return 0;
591}
592#endif
593
594static SIMPLE_DEV_PM_OPS(twl_rtc_pm_ops, twl_rtc_suspend, twl_rtc_resume);
595
596#ifdef CONFIG_OF
597static const struct of_device_id twl_rtc_of_match[] = {
598 {.compatible = "ti,twl4030-rtc", },
599 { },
600};
601MODULE_DEVICE_TABLE(of, twl_rtc_of_match);
602#endif
603
604MODULE_ALIAS("platform:twl_rtc");
605
606static struct platform_driver twl4030rtc_driver = {
607 .probe = twl_rtc_probe,
608 .remove = twl_rtc_remove,
609 .shutdown = twl_rtc_shutdown,
610 .driver = {
611 .owner = THIS_MODULE,
612 .name = "twl_rtc",
613 .pm = &twl_rtc_pm_ops,
614 .of_match_table = of_match_ptr(twl_rtc_of_match),
615 },
616};
617
618module_platform_driver(twl4030rtc_driver);
619
620MODULE_AUTHOR("Texas Instruments, MontaVista Software");
621MODULE_LICENSE("GPL");