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1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
3 */
4#include <linux/of.h>
5#include <linux/module.h>
6#include <linux/init.h>
7#include <linux/rtc.h>
8#include <linux/platform_device.h>
9#include <linux/pm.h>
10#include <linux/pm_wakeirq.h>
11#include <linux/regmap.h>
12#include <linux/slab.h>
13#include <linux/spinlock.h>
14
15/* RTC Register offsets from RTC CTRL REG */
16#define PM8XXX_ALARM_CTRL_OFFSET 0x01
17#define PM8XXX_RTC_WRITE_OFFSET 0x02
18#define PM8XXX_RTC_READ_OFFSET 0x06
19#define PM8XXX_ALARM_RW_OFFSET 0x0A
20
21/* RTC_CTRL register bit fields */
22#define PM8xxx_RTC_ENABLE BIT(7)
23#define PM8xxx_RTC_ALARM_CLEAR BIT(0)
24#define PM8xxx_RTC_ALARM_ENABLE BIT(7)
25
26#define NUM_8_BIT_RTC_REGS 0x4
27
28/**
29 * struct pm8xxx_rtc_regs - describe RTC registers per PMIC versions
30 * @ctrl: base address of control register
31 * @write: base address of write register
32 * @read: base address of read register
33 * @alarm_ctrl: base address of alarm control register
34 * @alarm_ctrl2: base address of alarm control2 register
35 * @alarm_rw: base address of alarm read-write register
36 * @alarm_en: alarm enable mask
37 */
38struct pm8xxx_rtc_regs {
39 unsigned int ctrl;
40 unsigned int write;
41 unsigned int read;
42 unsigned int alarm_ctrl;
43 unsigned int alarm_ctrl2;
44 unsigned int alarm_rw;
45 unsigned int alarm_en;
46};
47
48/**
49 * struct pm8xxx_rtc - rtc driver internal structure
50 * @rtc: rtc device for this driver.
51 * @regmap: regmap used to access RTC registers
52 * @allow_set_time: indicates whether writing to the RTC is allowed
53 * @rtc_alarm_irq: rtc alarm irq number.
54 * @regs: rtc registers description.
55 * @rtc_dev: device structure.
56 * @ctrl_reg_lock: spinlock protecting access to ctrl_reg.
57 */
58struct pm8xxx_rtc {
59 struct rtc_device *rtc;
60 struct regmap *regmap;
61 bool allow_set_time;
62 int rtc_alarm_irq;
63 const struct pm8xxx_rtc_regs *regs;
64 struct device *rtc_dev;
65 spinlock_t ctrl_reg_lock;
66};
67
68/*
69 * Steps to write the RTC registers.
70 * 1. Disable alarm if enabled.
71 * 2. Disable rtc if enabled.
72 * 3. Write 0x00 to LSB.
73 * 4. Write Byte[1], Byte[2], Byte[3] then Byte[0].
74 * 5. Enable rtc if disabled in step 2.
75 * 6. Enable alarm if disabled in step 1.
76 */
77static int pm8xxx_rtc_set_time(struct device *dev, struct rtc_time *tm)
78{
79 int rc, i;
80 unsigned long secs, irq_flags;
81 u8 value[NUM_8_BIT_RTC_REGS], alarm_enabled = 0, rtc_disabled = 0;
82 unsigned int ctrl_reg, rtc_ctrl_reg;
83 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
84 const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
85
86 if (!rtc_dd->allow_set_time)
87 return -ENODEV;
88
89 secs = rtc_tm_to_time64(tm);
90
91 dev_dbg(dev, "Seconds value to be written to RTC = %lu\n", secs);
92
93 for (i = 0; i < NUM_8_BIT_RTC_REGS; i++) {
94 value[i] = secs & 0xFF;
95 secs >>= 8;
96 }
97
98 spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
99
100 rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl, &ctrl_reg);
101 if (rc)
102 goto rtc_rw_fail;
103
104 if (ctrl_reg & regs->alarm_en) {
105 alarm_enabled = 1;
106 ctrl_reg &= ~regs->alarm_en;
107 rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl, ctrl_reg);
108 if (rc) {
109 dev_err(dev, "Write to RTC Alarm control register failed\n");
110 goto rtc_rw_fail;
111 }
112 }
113
114 /* Disable RTC H/w before writing on RTC register */
115 rc = regmap_read(rtc_dd->regmap, regs->ctrl, &rtc_ctrl_reg);
116 if (rc)
117 goto rtc_rw_fail;
118
119 if (rtc_ctrl_reg & PM8xxx_RTC_ENABLE) {
120 rtc_disabled = 1;
121 rtc_ctrl_reg &= ~PM8xxx_RTC_ENABLE;
122 rc = regmap_write(rtc_dd->regmap, regs->ctrl, rtc_ctrl_reg);
123 if (rc) {
124 dev_err(dev, "Write to RTC control register failed\n");
125 goto rtc_rw_fail;
126 }
127 }
128
129 /* Write 0 to Byte[0] */
130 rc = regmap_write(rtc_dd->regmap, regs->write, 0);
131 if (rc) {
132 dev_err(dev, "Write to RTC write data register failed\n");
133 goto rtc_rw_fail;
134 }
135
136 /* Write Byte[1], Byte[2], Byte[3] */
137 rc = regmap_bulk_write(rtc_dd->regmap, regs->write + 1,
138 &value[1], sizeof(value) - 1);
139 if (rc) {
140 dev_err(dev, "Write to RTC write data register failed\n");
141 goto rtc_rw_fail;
142 }
143
144 /* Write Byte[0] */
145 rc = regmap_write(rtc_dd->regmap, regs->write, value[0]);
146 if (rc) {
147 dev_err(dev, "Write to RTC write data register failed\n");
148 goto rtc_rw_fail;
149 }
150
151 /* Enable RTC H/w after writing on RTC register */
152 if (rtc_disabled) {
153 rtc_ctrl_reg |= PM8xxx_RTC_ENABLE;
154 rc = regmap_write(rtc_dd->regmap, regs->ctrl, rtc_ctrl_reg);
155 if (rc) {
156 dev_err(dev, "Write to RTC control register failed\n");
157 goto rtc_rw_fail;
158 }
159 }
160
161 if (alarm_enabled) {
162 ctrl_reg |= regs->alarm_en;
163 rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl, ctrl_reg);
164 if (rc) {
165 dev_err(dev, "Write to RTC Alarm control register failed\n");
166 goto rtc_rw_fail;
167 }
168 }
169
170rtc_rw_fail:
171 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
172
173 return rc;
174}
175
176static int pm8xxx_rtc_read_time(struct device *dev, struct rtc_time *tm)
177{
178 int rc;
179 u8 value[NUM_8_BIT_RTC_REGS];
180 unsigned long secs;
181 unsigned int reg;
182 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
183 const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
184
185 rc = regmap_bulk_read(rtc_dd->regmap, regs->read, value, sizeof(value));
186 if (rc) {
187 dev_err(dev, "RTC read data register failed\n");
188 return rc;
189 }
190
191 /*
192 * Read the LSB again and check if there has been a carry over.
193 * If there is, redo the read operation.
194 */
195 rc = regmap_read(rtc_dd->regmap, regs->read, ®);
196 if (rc < 0) {
197 dev_err(dev, "RTC read data register failed\n");
198 return rc;
199 }
200
201 if (unlikely(reg < value[0])) {
202 rc = regmap_bulk_read(rtc_dd->regmap, regs->read,
203 value, sizeof(value));
204 if (rc) {
205 dev_err(dev, "RTC read data register failed\n");
206 return rc;
207 }
208 }
209
210 secs = value[0] | (value[1] << 8) | (value[2] << 16) |
211 ((unsigned long)value[3] << 24);
212
213 rtc_time64_to_tm(secs, tm);
214
215 dev_dbg(dev, "secs = %lu, h:m:s == %ptRt, y-m-d = %ptRdr\n", secs, tm, tm);
216
217 return 0;
218}
219
220static int pm8xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
221{
222 int rc, i;
223 u8 value[NUM_8_BIT_RTC_REGS];
224 unsigned int ctrl_reg;
225 unsigned long secs, irq_flags;
226 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
227 const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
228
229 secs = rtc_tm_to_time64(&alarm->time);
230
231 for (i = 0; i < NUM_8_BIT_RTC_REGS; i++) {
232 value[i] = secs & 0xFF;
233 secs >>= 8;
234 }
235
236 spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
237
238 rc = regmap_bulk_write(rtc_dd->regmap, regs->alarm_rw, value,
239 sizeof(value));
240 if (rc) {
241 dev_err(dev, "Write to RTC ALARM register failed\n");
242 goto rtc_rw_fail;
243 }
244
245 rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl, &ctrl_reg);
246 if (rc)
247 goto rtc_rw_fail;
248
249 if (alarm->enabled)
250 ctrl_reg |= regs->alarm_en;
251 else
252 ctrl_reg &= ~regs->alarm_en;
253
254 rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl, ctrl_reg);
255 if (rc) {
256 dev_err(dev, "Write to RTC alarm control register failed\n");
257 goto rtc_rw_fail;
258 }
259
260 dev_dbg(dev, "Alarm Set for h:m:s=%ptRt, y-m-d=%ptRdr\n",
261 &alarm->time, &alarm->time);
262rtc_rw_fail:
263 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
264 return rc;
265}
266
267static int pm8xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
268{
269 int rc;
270 unsigned int ctrl_reg;
271 u8 value[NUM_8_BIT_RTC_REGS];
272 unsigned long secs;
273 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
274 const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
275
276 rc = regmap_bulk_read(rtc_dd->regmap, regs->alarm_rw, value,
277 sizeof(value));
278 if (rc) {
279 dev_err(dev, "RTC alarm time read failed\n");
280 return rc;
281 }
282
283 secs = value[0] | (value[1] << 8) | (value[2] << 16) |
284 ((unsigned long)value[3] << 24);
285
286 rtc_time64_to_tm(secs, &alarm->time);
287
288 rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl, &ctrl_reg);
289 if (rc) {
290 dev_err(dev, "Read from RTC alarm control register failed\n");
291 return rc;
292 }
293 alarm->enabled = !!(ctrl_reg & PM8xxx_RTC_ALARM_ENABLE);
294
295 dev_dbg(dev, "Alarm set for - h:m:s=%ptRt, y-m-d=%ptRdr\n",
296 &alarm->time, &alarm->time);
297
298 return 0;
299}
300
301static int pm8xxx_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
302{
303 int rc;
304 unsigned long irq_flags;
305 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
306 const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
307 unsigned int ctrl_reg;
308 u8 value[NUM_8_BIT_RTC_REGS] = {0};
309
310 spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
311
312 rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl, &ctrl_reg);
313 if (rc)
314 goto rtc_rw_fail;
315
316 if (enable)
317 ctrl_reg |= regs->alarm_en;
318 else
319 ctrl_reg &= ~regs->alarm_en;
320
321 rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl, ctrl_reg);
322 if (rc) {
323 dev_err(dev, "Write to RTC control register failed\n");
324 goto rtc_rw_fail;
325 }
326
327 /* Clear Alarm register */
328 if (!enable) {
329 rc = regmap_bulk_write(rtc_dd->regmap, regs->alarm_rw, value,
330 sizeof(value));
331 if (rc) {
332 dev_err(dev, "Clear RTC ALARM register failed\n");
333 goto rtc_rw_fail;
334 }
335 }
336
337rtc_rw_fail:
338 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
339 return rc;
340}
341
342static const struct rtc_class_ops pm8xxx_rtc_ops = {
343 .read_time = pm8xxx_rtc_read_time,
344 .set_time = pm8xxx_rtc_set_time,
345 .set_alarm = pm8xxx_rtc_set_alarm,
346 .read_alarm = pm8xxx_rtc_read_alarm,
347 .alarm_irq_enable = pm8xxx_rtc_alarm_irq_enable,
348};
349
350static irqreturn_t pm8xxx_alarm_trigger(int irq, void *dev_id)
351{
352 struct pm8xxx_rtc *rtc_dd = dev_id;
353 const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
354 unsigned int ctrl_reg;
355 int rc;
356
357 rtc_update_irq(rtc_dd->rtc, 1, RTC_IRQF | RTC_AF);
358
359 spin_lock(&rtc_dd->ctrl_reg_lock);
360
361 /* Clear the alarm enable bit */
362 rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl, &ctrl_reg);
363 if (rc) {
364 spin_unlock(&rtc_dd->ctrl_reg_lock);
365 goto rtc_alarm_handled;
366 }
367
368 ctrl_reg &= ~regs->alarm_en;
369
370 rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl, ctrl_reg);
371 if (rc) {
372 spin_unlock(&rtc_dd->ctrl_reg_lock);
373 dev_err(rtc_dd->rtc_dev,
374 "Write to alarm control register failed\n");
375 goto rtc_alarm_handled;
376 }
377
378 spin_unlock(&rtc_dd->ctrl_reg_lock);
379
380 /* Clear RTC alarm register */
381 rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl2, &ctrl_reg);
382 if (rc) {
383 dev_err(rtc_dd->rtc_dev,
384 "RTC Alarm control2 register read failed\n");
385 goto rtc_alarm_handled;
386 }
387
388 ctrl_reg |= PM8xxx_RTC_ALARM_CLEAR;
389 rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl2, ctrl_reg);
390 if (rc)
391 dev_err(rtc_dd->rtc_dev,
392 "Write to RTC Alarm control2 register failed\n");
393
394rtc_alarm_handled:
395 return IRQ_HANDLED;
396}
397
398static int pm8xxx_rtc_enable(struct pm8xxx_rtc *rtc_dd)
399{
400 const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
401 unsigned int ctrl_reg;
402 int rc;
403
404 /* Check if the RTC is on, else turn it on */
405 rc = regmap_read(rtc_dd->regmap, regs->ctrl, &ctrl_reg);
406 if (rc)
407 return rc;
408
409 if (!(ctrl_reg & PM8xxx_RTC_ENABLE)) {
410 ctrl_reg |= PM8xxx_RTC_ENABLE;
411 rc = regmap_write(rtc_dd->regmap, regs->ctrl, ctrl_reg);
412 if (rc)
413 return rc;
414 }
415
416 return 0;
417}
418
419static const struct pm8xxx_rtc_regs pm8921_regs = {
420 .ctrl = 0x11d,
421 .write = 0x11f,
422 .read = 0x123,
423 .alarm_rw = 0x127,
424 .alarm_ctrl = 0x11d,
425 .alarm_ctrl2 = 0x11e,
426 .alarm_en = BIT(1),
427};
428
429static const struct pm8xxx_rtc_regs pm8058_regs = {
430 .ctrl = 0x1e8,
431 .write = 0x1ea,
432 .read = 0x1ee,
433 .alarm_rw = 0x1f2,
434 .alarm_ctrl = 0x1e8,
435 .alarm_ctrl2 = 0x1e9,
436 .alarm_en = BIT(1),
437};
438
439static const struct pm8xxx_rtc_regs pm8941_regs = {
440 .ctrl = 0x6046,
441 .write = 0x6040,
442 .read = 0x6048,
443 .alarm_rw = 0x6140,
444 .alarm_ctrl = 0x6146,
445 .alarm_ctrl2 = 0x6148,
446 .alarm_en = BIT(7),
447};
448
449static const struct pm8xxx_rtc_regs pmk8350_regs = {
450 .ctrl = 0x6146,
451 .write = 0x6140,
452 .read = 0x6148,
453 .alarm_rw = 0x6240,
454 .alarm_ctrl = 0x6246,
455 .alarm_ctrl2 = 0x6248,
456 .alarm_en = BIT(7),
457};
458
459/*
460 * Hardcoded RTC bases until IORESOURCE_REG mapping is figured out
461 */
462static const struct of_device_id pm8xxx_id_table[] = {
463 { .compatible = "qcom,pm8921-rtc", .data = &pm8921_regs },
464 { .compatible = "qcom,pm8058-rtc", .data = &pm8058_regs },
465 { .compatible = "qcom,pm8941-rtc", .data = &pm8941_regs },
466 { .compatible = "qcom,pmk8350-rtc", .data = &pmk8350_regs },
467 { },
468};
469MODULE_DEVICE_TABLE(of, pm8xxx_id_table);
470
471static int pm8xxx_rtc_probe(struct platform_device *pdev)
472{
473 int rc;
474 struct pm8xxx_rtc *rtc_dd;
475 const struct of_device_id *match;
476
477 match = of_match_node(pm8xxx_id_table, pdev->dev.of_node);
478 if (!match)
479 return -ENXIO;
480
481 rtc_dd = devm_kzalloc(&pdev->dev, sizeof(*rtc_dd), GFP_KERNEL);
482 if (rtc_dd == NULL)
483 return -ENOMEM;
484
485 /* Initialise spinlock to protect RTC control register */
486 spin_lock_init(&rtc_dd->ctrl_reg_lock);
487
488 rtc_dd->regmap = dev_get_regmap(pdev->dev.parent, NULL);
489 if (!rtc_dd->regmap) {
490 dev_err(&pdev->dev, "Parent regmap unavailable.\n");
491 return -ENXIO;
492 }
493
494 rtc_dd->rtc_alarm_irq = platform_get_irq(pdev, 0);
495 if (rtc_dd->rtc_alarm_irq < 0)
496 return -ENXIO;
497
498 rtc_dd->allow_set_time = of_property_read_bool(pdev->dev.of_node,
499 "allow-set-time");
500
501 rtc_dd->regs = match->data;
502 rtc_dd->rtc_dev = &pdev->dev;
503
504 rc = pm8xxx_rtc_enable(rtc_dd);
505 if (rc)
506 return rc;
507
508 platform_set_drvdata(pdev, rtc_dd);
509
510 device_init_wakeup(&pdev->dev, 1);
511
512 /* Register the RTC device */
513 rtc_dd->rtc = devm_rtc_allocate_device(&pdev->dev);
514 if (IS_ERR(rtc_dd->rtc))
515 return PTR_ERR(rtc_dd->rtc);
516
517 rtc_dd->rtc->ops = &pm8xxx_rtc_ops;
518 rtc_dd->rtc->range_max = U32_MAX;
519
520 /* Request the alarm IRQ */
521 rc = devm_request_any_context_irq(&pdev->dev, rtc_dd->rtc_alarm_irq,
522 pm8xxx_alarm_trigger,
523 IRQF_TRIGGER_RISING,
524 "pm8xxx_rtc_alarm", rtc_dd);
525 if (rc < 0) {
526 dev_err(&pdev->dev, "Request IRQ failed (%d)\n", rc);
527 return rc;
528 }
529
530 rc = devm_rtc_register_device(rtc_dd->rtc);
531 if (rc)
532 return rc;
533
534 rc = dev_pm_set_wake_irq(&pdev->dev, rtc_dd->rtc_alarm_irq);
535 if (rc)
536 return rc;
537
538 return 0;
539}
540
541static int pm8xxx_remove(struct platform_device *pdev)
542{
543 dev_pm_clear_wake_irq(&pdev->dev);
544 return 0;
545}
546
547static struct platform_driver pm8xxx_rtc_driver = {
548 .probe = pm8xxx_rtc_probe,
549 .remove = pm8xxx_remove,
550 .driver = {
551 .name = "rtc-pm8xxx",
552 .of_match_table = pm8xxx_id_table,
553 },
554};
555
556module_platform_driver(pm8xxx_rtc_driver);
557
558MODULE_ALIAS("platform:rtc-pm8xxx");
559MODULE_DESCRIPTION("PMIC8xxx RTC driver");
560MODULE_LICENSE("GPL v2");
561MODULE_AUTHOR("Anirudh Ghayal <aghayal@codeaurora.org>");
1/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 and
5 * only version 2 as published by the Free Software Foundation.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 */
12#include <linux/of.h>
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/rtc.h>
16#include <linux/platform_device.h>
17#include <linux/pm.h>
18#include <linux/regmap.h>
19#include <linux/slab.h>
20#include <linux/spinlock.h>
21
22/* RTC Register offsets from RTC CTRL REG */
23#define PM8XXX_ALARM_CTRL_OFFSET 0x01
24#define PM8XXX_RTC_WRITE_OFFSET 0x02
25#define PM8XXX_RTC_READ_OFFSET 0x06
26#define PM8XXX_ALARM_RW_OFFSET 0x0A
27
28/* RTC_CTRL register bit fields */
29#define PM8xxx_RTC_ENABLE BIT(7)
30#define PM8xxx_RTC_ALARM_ENABLE BIT(1)
31#define PM8xxx_RTC_ALARM_CLEAR BIT(0)
32
33#define NUM_8_BIT_RTC_REGS 0x4
34
35/**
36 * struct pm8xxx_rtc - rtc driver internal structure
37 * @rtc: rtc device for this driver.
38 * @regmap: regmap used to access RTC registers
39 * @allow_set_time: indicates whether writing to the RTC is allowed
40 * @rtc_alarm_irq: rtc alarm irq number.
41 * @rtc_base: address of rtc control register.
42 * @rtc_read_base: base address of read registers.
43 * @rtc_write_base: base address of write registers.
44 * @alarm_rw_base: base address of alarm registers.
45 * @ctrl_reg: rtc control register.
46 * @rtc_dev: device structure.
47 * @ctrl_reg_lock: spinlock protecting access to ctrl_reg.
48 */
49struct pm8xxx_rtc {
50 struct rtc_device *rtc;
51 struct regmap *regmap;
52 bool allow_set_time;
53 int rtc_alarm_irq;
54 int rtc_base;
55 int rtc_read_base;
56 int rtc_write_base;
57 int alarm_rw_base;
58 u8 ctrl_reg;
59 struct device *rtc_dev;
60 spinlock_t ctrl_reg_lock;
61};
62
63/*
64 * Steps to write the RTC registers.
65 * 1. Disable alarm if enabled.
66 * 2. Write 0x00 to LSB.
67 * 3. Write Byte[1], Byte[2], Byte[3] then Byte[0].
68 * 4. Enable alarm if disabled in step 1.
69 */
70static int pm8xxx_rtc_set_time(struct device *dev, struct rtc_time *tm)
71{
72 int rc, i;
73 unsigned long secs, irq_flags;
74 u8 value[NUM_8_BIT_RTC_REGS], alarm_enabled = 0, ctrl_reg;
75 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
76
77 if (!rtc_dd->allow_set_time)
78 return -EACCES;
79
80 rtc_tm_to_time(tm, &secs);
81
82 for (i = 0; i < NUM_8_BIT_RTC_REGS; i++) {
83 value[i] = secs & 0xFF;
84 secs >>= 8;
85 }
86
87 dev_dbg(dev, "Seconds value to be written to RTC = %lu\n", secs);
88
89 spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
90 ctrl_reg = rtc_dd->ctrl_reg;
91
92 if (ctrl_reg & PM8xxx_RTC_ALARM_ENABLE) {
93 alarm_enabled = 1;
94 ctrl_reg &= ~PM8xxx_RTC_ALARM_ENABLE;
95 rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_base, ctrl_reg);
96 if (rc) {
97 dev_err(dev, "Write to RTC control register failed\n");
98 goto rtc_rw_fail;
99 }
100 rtc_dd->ctrl_reg = ctrl_reg;
101 } else {
102 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
103 }
104
105 /* Write 0 to Byte[0] */
106 rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_write_base, 0);
107 if (rc) {
108 dev_err(dev, "Write to RTC write data register failed\n");
109 goto rtc_rw_fail;
110 }
111
112 /* Write Byte[1], Byte[2], Byte[3] */
113 rc = regmap_bulk_write(rtc_dd->regmap, rtc_dd->rtc_write_base + 1,
114 &value[1], sizeof(value) - 1);
115 if (rc) {
116 dev_err(dev, "Write to RTC write data register failed\n");
117 goto rtc_rw_fail;
118 }
119
120 /* Write Byte[0] */
121 rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_write_base, value[0]);
122 if (rc) {
123 dev_err(dev, "Write to RTC write data register failed\n");
124 goto rtc_rw_fail;
125 }
126
127 if (alarm_enabled) {
128 ctrl_reg |= PM8xxx_RTC_ALARM_ENABLE;
129 rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_base, ctrl_reg);
130 if (rc) {
131 dev_err(dev, "Write to RTC control register failed\n");
132 goto rtc_rw_fail;
133 }
134 rtc_dd->ctrl_reg = ctrl_reg;
135 }
136
137rtc_rw_fail:
138 if (alarm_enabled)
139 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
140
141 return rc;
142}
143
144static int pm8xxx_rtc_read_time(struct device *dev, struct rtc_time *tm)
145{
146 int rc;
147 u8 value[NUM_8_BIT_RTC_REGS];
148 unsigned long secs;
149 unsigned int reg;
150 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
151
152 rc = regmap_bulk_read(rtc_dd->regmap, rtc_dd->rtc_read_base,
153 value, sizeof(value));
154 if (rc) {
155 dev_err(dev, "RTC read data register failed\n");
156 return rc;
157 }
158
159 /*
160 * Read the LSB again and check if there has been a carry over.
161 * If there is, redo the read operation.
162 */
163 rc = regmap_read(rtc_dd->regmap, rtc_dd->rtc_read_base, ®);
164 if (rc < 0) {
165 dev_err(dev, "RTC read data register failed\n");
166 return rc;
167 }
168
169 if (unlikely(reg < value[0])) {
170 rc = regmap_bulk_read(rtc_dd->regmap, rtc_dd->rtc_read_base,
171 value, sizeof(value));
172 if (rc) {
173 dev_err(dev, "RTC read data register failed\n");
174 return rc;
175 }
176 }
177
178 secs = value[0] | (value[1] << 8) | (value[2] << 16) | (value[3] << 24);
179
180 rtc_time_to_tm(secs, tm);
181
182 rc = rtc_valid_tm(tm);
183 if (rc < 0) {
184 dev_err(dev, "Invalid time read from RTC\n");
185 return rc;
186 }
187
188 dev_dbg(dev, "secs = %lu, h:m:s == %d:%d:%d, d/m/y = %d/%d/%d\n",
189 secs, tm->tm_hour, tm->tm_min, tm->tm_sec,
190 tm->tm_mday, tm->tm_mon, tm->tm_year);
191
192 return 0;
193}
194
195static int pm8xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
196{
197 int rc, i;
198 u8 value[NUM_8_BIT_RTC_REGS], ctrl_reg;
199 unsigned long secs, irq_flags;
200 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
201
202 rtc_tm_to_time(&alarm->time, &secs);
203
204 for (i = 0; i < NUM_8_BIT_RTC_REGS; i++) {
205 value[i] = secs & 0xFF;
206 secs >>= 8;
207 }
208
209 spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
210
211 rc = regmap_bulk_write(rtc_dd->regmap, rtc_dd->alarm_rw_base, value,
212 sizeof(value));
213 if (rc) {
214 dev_err(dev, "Write to RTC ALARM register failed\n");
215 goto rtc_rw_fail;
216 }
217
218 ctrl_reg = rtc_dd->ctrl_reg;
219
220 if (alarm->enabled)
221 ctrl_reg |= PM8xxx_RTC_ALARM_ENABLE;
222 else
223 ctrl_reg &= ~PM8xxx_RTC_ALARM_ENABLE;
224
225 rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_base, ctrl_reg);
226 if (rc) {
227 dev_err(dev, "Write to RTC control register failed\n");
228 goto rtc_rw_fail;
229 }
230
231 rtc_dd->ctrl_reg = ctrl_reg;
232
233 dev_dbg(dev, "Alarm Set for h:r:s=%d:%d:%d, d/m/y=%d/%d/%d\n",
234 alarm->time.tm_hour, alarm->time.tm_min,
235 alarm->time.tm_sec, alarm->time.tm_mday,
236 alarm->time.tm_mon, alarm->time.tm_year);
237rtc_rw_fail:
238 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
239 return rc;
240}
241
242static int pm8xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
243{
244 int rc;
245 u8 value[NUM_8_BIT_RTC_REGS];
246 unsigned long secs;
247 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
248
249 rc = regmap_bulk_read(rtc_dd->regmap, rtc_dd->alarm_rw_base, value,
250 sizeof(value));
251 if (rc) {
252 dev_err(dev, "RTC alarm time read failed\n");
253 return rc;
254 }
255
256 secs = value[0] | (value[1] << 8) | (value[2] << 16) | (value[3] << 24);
257
258 rtc_time_to_tm(secs, &alarm->time);
259
260 rc = rtc_valid_tm(&alarm->time);
261 if (rc < 0) {
262 dev_err(dev, "Invalid alarm time read from RTC\n");
263 return rc;
264 }
265
266 dev_dbg(dev, "Alarm set for - h:r:s=%d:%d:%d, d/m/y=%d/%d/%d\n",
267 alarm->time.tm_hour, alarm->time.tm_min,
268 alarm->time.tm_sec, alarm->time.tm_mday,
269 alarm->time.tm_mon, alarm->time.tm_year);
270
271 return 0;
272}
273
274static int pm8xxx_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
275{
276 int rc;
277 unsigned long irq_flags;
278 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
279 u8 ctrl_reg;
280
281 spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
282
283 ctrl_reg = rtc_dd->ctrl_reg;
284
285 if (enable)
286 ctrl_reg |= PM8xxx_RTC_ALARM_ENABLE;
287 else
288 ctrl_reg &= ~PM8xxx_RTC_ALARM_ENABLE;
289
290 rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_base, ctrl_reg);
291 if (rc) {
292 dev_err(dev, "Write to RTC control register failed\n");
293 goto rtc_rw_fail;
294 }
295
296 rtc_dd->ctrl_reg = ctrl_reg;
297
298rtc_rw_fail:
299 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
300 return rc;
301}
302
303static const struct rtc_class_ops pm8xxx_rtc_ops = {
304 .read_time = pm8xxx_rtc_read_time,
305 .set_time = pm8xxx_rtc_set_time,
306 .set_alarm = pm8xxx_rtc_set_alarm,
307 .read_alarm = pm8xxx_rtc_read_alarm,
308 .alarm_irq_enable = pm8xxx_rtc_alarm_irq_enable,
309};
310
311static irqreturn_t pm8xxx_alarm_trigger(int irq, void *dev_id)
312{
313 struct pm8xxx_rtc *rtc_dd = dev_id;
314 unsigned int ctrl_reg;
315 int rc;
316 unsigned long irq_flags;
317
318 rtc_update_irq(rtc_dd->rtc, 1, RTC_IRQF | RTC_AF);
319
320 spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
321
322 /* Clear the alarm enable bit */
323 ctrl_reg = rtc_dd->ctrl_reg;
324 ctrl_reg &= ~PM8xxx_RTC_ALARM_ENABLE;
325
326 rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_base, ctrl_reg);
327 if (rc) {
328 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
329 dev_err(rtc_dd->rtc_dev,
330 "Write to RTC control register failed\n");
331 goto rtc_alarm_handled;
332 }
333
334 rtc_dd->ctrl_reg = ctrl_reg;
335 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
336
337 /* Clear RTC alarm register */
338 rc = regmap_read(rtc_dd->regmap,
339 rtc_dd->rtc_base + PM8XXX_ALARM_CTRL_OFFSET,
340 &ctrl_reg);
341 if (rc) {
342 dev_err(rtc_dd->rtc_dev,
343 "RTC Alarm control register read failed\n");
344 goto rtc_alarm_handled;
345 }
346
347 ctrl_reg &= ~PM8xxx_RTC_ALARM_CLEAR;
348 rc = regmap_write(rtc_dd->regmap,
349 rtc_dd->rtc_base + PM8XXX_ALARM_CTRL_OFFSET,
350 ctrl_reg);
351 if (rc)
352 dev_err(rtc_dd->rtc_dev,
353 "Write to RTC Alarm control register failed\n");
354
355rtc_alarm_handled:
356 return IRQ_HANDLED;
357}
358
359/*
360 * Hardcoded RTC bases until IORESOURCE_REG mapping is figured out
361 */
362static const struct of_device_id pm8xxx_id_table[] = {
363 { .compatible = "qcom,pm8921-rtc", .data = (void *) 0x11D },
364 { .compatible = "qcom,pm8058-rtc", .data = (void *) 0x1E8 },
365 { },
366};
367MODULE_DEVICE_TABLE(of, pm8xxx_id_table);
368
369static int pm8xxx_rtc_probe(struct platform_device *pdev)
370{
371 int rc;
372 unsigned int ctrl_reg;
373 struct pm8xxx_rtc *rtc_dd;
374 const struct of_device_id *match;
375
376 match = of_match_node(pm8xxx_id_table, pdev->dev.of_node);
377 if (!match)
378 return -ENXIO;
379
380 rtc_dd = devm_kzalloc(&pdev->dev, sizeof(*rtc_dd), GFP_KERNEL);
381 if (rtc_dd == NULL)
382 return -ENOMEM;
383
384 /* Initialise spinlock to protect RTC control register */
385 spin_lock_init(&rtc_dd->ctrl_reg_lock);
386
387 rtc_dd->regmap = dev_get_regmap(pdev->dev.parent, NULL);
388 if (!rtc_dd->regmap) {
389 dev_err(&pdev->dev, "Parent regmap unavailable.\n");
390 return -ENXIO;
391 }
392
393 rtc_dd->rtc_alarm_irq = platform_get_irq(pdev, 0);
394 if (rtc_dd->rtc_alarm_irq < 0) {
395 dev_err(&pdev->dev, "Alarm IRQ resource absent!\n");
396 return -ENXIO;
397 }
398
399 rtc_dd->allow_set_time = of_property_read_bool(pdev->dev.of_node,
400 "allow-set-time");
401
402 rtc_dd->rtc_base = (long) match->data;
403
404 /* Setup RTC register addresses */
405 rtc_dd->rtc_write_base = rtc_dd->rtc_base + PM8XXX_RTC_WRITE_OFFSET;
406 rtc_dd->rtc_read_base = rtc_dd->rtc_base + PM8XXX_RTC_READ_OFFSET;
407 rtc_dd->alarm_rw_base = rtc_dd->rtc_base + PM8XXX_ALARM_RW_OFFSET;
408
409 rtc_dd->rtc_dev = &pdev->dev;
410
411 /* Check if the RTC is on, else turn it on */
412 rc = regmap_read(rtc_dd->regmap, rtc_dd->rtc_base, &ctrl_reg);
413 if (rc) {
414 dev_err(&pdev->dev, "RTC control register read failed!\n");
415 return rc;
416 }
417
418 if (!(ctrl_reg & PM8xxx_RTC_ENABLE)) {
419 ctrl_reg |= PM8xxx_RTC_ENABLE;
420 rc = regmap_write(rtc_dd->regmap, rtc_dd->rtc_base, ctrl_reg);
421 if (rc) {
422 dev_err(&pdev->dev,
423 "Write to RTC control register failed\n");
424 return rc;
425 }
426 }
427
428 rtc_dd->ctrl_reg = ctrl_reg;
429
430 platform_set_drvdata(pdev, rtc_dd);
431
432 device_init_wakeup(&pdev->dev, 1);
433
434 /* Register the RTC device */
435 rtc_dd->rtc = devm_rtc_device_register(&pdev->dev, "pm8xxx_rtc",
436 &pm8xxx_rtc_ops, THIS_MODULE);
437 if (IS_ERR(rtc_dd->rtc)) {
438 dev_err(&pdev->dev, "%s: RTC registration failed (%ld)\n",
439 __func__, PTR_ERR(rtc_dd->rtc));
440 return PTR_ERR(rtc_dd->rtc);
441 }
442
443 /* Request the alarm IRQ */
444 rc = devm_request_any_context_irq(&pdev->dev, rtc_dd->rtc_alarm_irq,
445 pm8xxx_alarm_trigger,
446 IRQF_TRIGGER_RISING,
447 "pm8xxx_rtc_alarm", rtc_dd);
448 if (rc < 0) {
449 dev_err(&pdev->dev, "Request IRQ failed (%d)\n", rc);
450 return rc;
451 }
452
453 dev_dbg(&pdev->dev, "Probe success !!\n");
454
455 return 0;
456}
457
458#ifdef CONFIG_PM_SLEEP
459static int pm8xxx_rtc_resume(struct device *dev)
460{
461 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
462
463 if (device_may_wakeup(dev))
464 disable_irq_wake(rtc_dd->rtc_alarm_irq);
465
466 return 0;
467}
468
469static int pm8xxx_rtc_suspend(struct device *dev)
470{
471 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
472
473 if (device_may_wakeup(dev))
474 enable_irq_wake(rtc_dd->rtc_alarm_irq);
475
476 return 0;
477}
478#endif
479
480static SIMPLE_DEV_PM_OPS(pm8xxx_rtc_pm_ops,
481 pm8xxx_rtc_suspend,
482 pm8xxx_rtc_resume);
483
484static struct platform_driver pm8xxx_rtc_driver = {
485 .probe = pm8xxx_rtc_probe,
486 .driver = {
487 .name = "rtc-pm8xxx",
488 .owner = THIS_MODULE,
489 .pm = &pm8xxx_rtc_pm_ops,
490 .of_match_table = pm8xxx_id_table,
491 },
492};
493
494module_platform_driver(pm8xxx_rtc_driver);
495
496MODULE_ALIAS("platform:rtc-pm8xxx");
497MODULE_DESCRIPTION("PMIC8xxx RTC driver");
498MODULE_LICENSE("GPL v2");
499MODULE_AUTHOR("Anirudh Ghayal <aghayal@codeaurora.org>");