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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
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/rtc.h>
16#include <linux/pm.h>
17#include <linux/slab.h>
18#include <linux/spinlock.h>
19
20#include <linux/mfd/pm8xxx/core.h>
21#include <linux/mfd/pm8xxx/rtc.h>
22
23
24/* RTC Register offsets from RTC CTRL REG */
25#define PM8XXX_ALARM_CTRL_OFFSET 0x01
26#define PM8XXX_RTC_WRITE_OFFSET 0x02
27#define PM8XXX_RTC_READ_OFFSET 0x06
28#define PM8XXX_ALARM_RW_OFFSET 0x0A
29
30/* RTC_CTRL register bit fields */
31#define PM8xxx_RTC_ENABLE BIT(7)
32#define PM8xxx_RTC_ALARM_ENABLE BIT(1)
33#define PM8xxx_RTC_ALARM_CLEAR BIT(0)
34
35#define NUM_8_BIT_RTC_REGS 0x4
36
37/**
38 * struct pm8xxx_rtc - rtc driver internal structure
39 * @rtc: rtc device for this driver.
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 int rtc_alarm_irq;
52 int rtc_base;
53 int rtc_read_base;
54 int rtc_write_base;
55 int alarm_rw_base;
56 u8 ctrl_reg;
57 struct device *rtc_dev;
58 spinlock_t ctrl_reg_lock;
59};
60
61/*
62 * The RTC registers need to be read/written one byte at a time. This is a
63 * hardware limitation.
64 */
65static int pm8xxx_read_wrapper(struct pm8xxx_rtc *rtc_dd, u8 *rtc_val,
66 int base, int count)
67{
68 int i, rc;
69 struct device *parent = rtc_dd->rtc_dev->parent;
70
71 for (i = 0; i < count; i++) {
72 rc = pm8xxx_readb(parent, base + i, &rtc_val[i]);
73 if (rc < 0) {
74 dev_err(rtc_dd->rtc_dev, "PMIC read failed\n");
75 return rc;
76 }
77 }
78
79 return 0;
80}
81
82static int pm8xxx_write_wrapper(struct pm8xxx_rtc *rtc_dd, u8 *rtc_val,
83 int base, int count)
84{
85 int i, rc;
86 struct device *parent = rtc_dd->rtc_dev->parent;
87
88 for (i = 0; i < count; i++) {
89 rc = pm8xxx_writeb(parent, base + i, rtc_val[i]);
90 if (rc < 0) {
91 dev_err(rtc_dd->rtc_dev, "PMIC write failed\n");
92 return rc;
93 }
94 }
95
96 return 0;
97}
98
99/*
100 * Steps to write the RTC registers.
101 * 1. Disable alarm if enabled.
102 * 2. Write 0x00 to LSB.
103 * 3. Write Byte[1], Byte[2], Byte[3] then Byte[0].
104 * 4. Enable alarm if disabled in step 1.
105 */
106static int pm8xxx_rtc_set_time(struct device *dev, struct rtc_time *tm)
107{
108 int rc, i;
109 unsigned long secs, irq_flags;
110 u8 value[NUM_8_BIT_RTC_REGS], reg = 0, alarm_enabled = 0, ctrl_reg;
111 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
112
113 rtc_tm_to_time(tm, &secs);
114
115 for (i = 0; i < NUM_8_BIT_RTC_REGS; i++) {
116 value[i] = secs & 0xFF;
117 secs >>= 8;
118 }
119
120 dev_dbg(dev, "Seconds value to be written to RTC = %lu\n", secs);
121
122 spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
123 ctrl_reg = rtc_dd->ctrl_reg;
124
125 if (ctrl_reg & PM8xxx_RTC_ALARM_ENABLE) {
126 alarm_enabled = 1;
127 ctrl_reg &= ~PM8xxx_RTC_ALARM_ENABLE;
128 rc = pm8xxx_write_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base,
129 1);
130 if (rc < 0) {
131 dev_err(dev, "Write to RTC control register "
132 "failed\n");
133 goto rtc_rw_fail;
134 }
135 rtc_dd->ctrl_reg = ctrl_reg;
136 } else
137 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
138
139 /* Write 0 to Byte[0] */
140 reg = 0;
141 rc = pm8xxx_write_wrapper(rtc_dd, ®, rtc_dd->rtc_write_base, 1);
142 if (rc < 0) {
143 dev_err(dev, "Write to RTC write data register failed\n");
144 goto rtc_rw_fail;
145 }
146
147 /* Write Byte[1], Byte[2], Byte[3] */
148 rc = pm8xxx_write_wrapper(rtc_dd, value + 1,
149 rtc_dd->rtc_write_base + 1, 3);
150 if (rc < 0) {
151 dev_err(dev, "Write to RTC write data register failed\n");
152 goto rtc_rw_fail;
153 }
154
155 /* Write Byte[0] */
156 rc = pm8xxx_write_wrapper(rtc_dd, value, rtc_dd->rtc_write_base, 1);
157 if (rc < 0) {
158 dev_err(dev, "Write to RTC write data register failed\n");
159 goto rtc_rw_fail;
160 }
161
162 if (alarm_enabled) {
163 ctrl_reg |= PM8xxx_RTC_ALARM_ENABLE;
164 rc = pm8xxx_write_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base,
165 1);
166 if (rc < 0) {
167 dev_err(dev, "Write to RTC control register "
168 "failed\n");
169 goto rtc_rw_fail;
170 }
171 rtc_dd->ctrl_reg = ctrl_reg;
172 }
173
174rtc_rw_fail:
175 if (alarm_enabled)
176 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
177
178 return rc;
179}
180
181static int pm8xxx_rtc_read_time(struct device *dev, struct rtc_time *tm)
182{
183 int rc;
184 u8 value[NUM_8_BIT_RTC_REGS], reg;
185 unsigned long secs;
186 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
187
188 rc = pm8xxx_read_wrapper(rtc_dd, value, rtc_dd->rtc_read_base,
189 NUM_8_BIT_RTC_REGS);
190 if (rc < 0) {
191 dev_err(dev, "RTC read data register failed\n");
192 return rc;
193 }
194
195 /*
196 * Read the LSB again and check if there has been a carry over.
197 * If there is, redo the read operation.
198 */
199 rc = pm8xxx_read_wrapper(rtc_dd, ®, rtc_dd->rtc_read_base, 1);
200 if (rc < 0) {
201 dev_err(dev, "RTC read data register failed\n");
202 return rc;
203 }
204
205 if (unlikely(reg < value[0])) {
206 rc = pm8xxx_read_wrapper(rtc_dd, value,
207 rtc_dd->rtc_read_base, NUM_8_BIT_RTC_REGS);
208 if (rc < 0) {
209 dev_err(dev, "RTC read data register failed\n");
210 return rc;
211 }
212 }
213
214 secs = value[0] | (value[1] << 8) | (value[2] << 16) | (value[3] << 24);
215
216 rtc_time_to_tm(secs, tm);
217
218 rc = rtc_valid_tm(tm);
219 if (rc < 0) {
220 dev_err(dev, "Invalid time read from RTC\n");
221 return rc;
222 }
223
224 dev_dbg(dev, "secs = %lu, h:m:s == %d:%d:%d, d/m/y = %d/%d/%d\n",
225 secs, tm->tm_hour, tm->tm_min, tm->tm_sec,
226 tm->tm_mday, tm->tm_mon, tm->tm_year);
227
228 return 0;
229}
230
231static int pm8xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
232{
233 int rc, i;
234 u8 value[NUM_8_BIT_RTC_REGS], ctrl_reg;
235 unsigned long secs, irq_flags;
236 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
237
238 rtc_tm_to_time(&alarm->time, &secs);
239
240 for (i = 0; i < NUM_8_BIT_RTC_REGS; i++) {
241 value[i] = secs & 0xFF;
242 secs >>= 8;
243 }
244
245 spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
246
247 rc = pm8xxx_write_wrapper(rtc_dd, value, rtc_dd->alarm_rw_base,
248 NUM_8_BIT_RTC_REGS);
249 if (rc < 0) {
250 dev_err(dev, "Write to RTC ALARM register failed\n");
251 goto rtc_rw_fail;
252 }
253
254 ctrl_reg = rtc_dd->ctrl_reg;
255 ctrl_reg = alarm->enabled ? (ctrl_reg | PM8xxx_RTC_ALARM_ENABLE) :
256 (ctrl_reg & ~PM8xxx_RTC_ALARM_ENABLE);
257
258 rc = pm8xxx_write_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base, 1);
259 if (rc < 0) {
260 dev_err(dev, "Write to RTC control register failed\n");
261 goto rtc_rw_fail;
262 }
263
264 rtc_dd->ctrl_reg = ctrl_reg;
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);
270rtc_rw_fail:
271 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
272 return rc;
273}
274
275static int pm8xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
276{
277 int rc;
278 u8 value[NUM_8_BIT_RTC_REGS];
279 unsigned long secs;
280 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
281
282 rc = pm8xxx_read_wrapper(rtc_dd, value, rtc_dd->alarm_rw_base,
283 NUM_8_BIT_RTC_REGS);
284 if (rc < 0) {
285 dev_err(dev, "RTC alarm time read failed\n");
286 return rc;
287 }
288
289 secs = value[0] | (value[1] << 8) | (value[2] << 16) | (value[3] << 24);
290
291 rtc_time_to_tm(secs, &alarm->time);
292
293 rc = rtc_valid_tm(&alarm->time);
294 if (rc < 0) {
295 dev_err(dev, "Invalid alarm time read from RTC\n");
296 return rc;
297 }
298
299 dev_dbg(dev, "Alarm set for - h:r:s=%d:%d:%d, d/m/y=%d/%d/%d\n",
300 alarm->time.tm_hour, alarm->time.tm_min,
301 alarm->time.tm_sec, alarm->time.tm_mday,
302 alarm->time.tm_mon, alarm->time.tm_year);
303
304 return 0;
305}
306
307static int pm8xxx_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
308{
309 int rc;
310 unsigned long irq_flags;
311 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
312 u8 ctrl_reg;
313
314 spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
315 ctrl_reg = rtc_dd->ctrl_reg;
316 ctrl_reg = (enable) ? (ctrl_reg | PM8xxx_RTC_ALARM_ENABLE) :
317 (ctrl_reg & ~PM8xxx_RTC_ALARM_ENABLE);
318
319 rc = pm8xxx_write_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base, 1);
320 if (rc < 0) {
321 dev_err(dev, "Write to RTC control register failed\n");
322 goto rtc_rw_fail;
323 }
324
325 rtc_dd->ctrl_reg = ctrl_reg;
326
327rtc_rw_fail:
328 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
329 return rc;
330}
331
332static struct rtc_class_ops pm8xxx_rtc_ops = {
333 .read_time = pm8xxx_rtc_read_time,
334 .set_alarm = pm8xxx_rtc_set_alarm,
335 .read_alarm = pm8xxx_rtc_read_alarm,
336 .alarm_irq_enable = pm8xxx_rtc_alarm_irq_enable,
337};
338
339static irqreturn_t pm8xxx_alarm_trigger(int irq, void *dev_id)
340{
341 struct pm8xxx_rtc *rtc_dd = dev_id;
342 u8 ctrl_reg;
343 int rc;
344 unsigned long irq_flags;
345
346 rtc_update_irq(rtc_dd->rtc, 1, RTC_IRQF | RTC_AF);
347
348 spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
349
350 /* Clear the alarm enable bit */
351 ctrl_reg = rtc_dd->ctrl_reg;
352 ctrl_reg &= ~PM8xxx_RTC_ALARM_ENABLE;
353
354 rc = pm8xxx_write_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base, 1);
355 if (rc < 0) {
356 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
357 dev_err(rtc_dd->rtc_dev, "Write to RTC control register "
358 "failed\n");
359 goto rtc_alarm_handled;
360 }
361
362 rtc_dd->ctrl_reg = ctrl_reg;
363 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
364
365 /* Clear RTC alarm register */
366 rc = pm8xxx_read_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base +
367 PM8XXX_ALARM_CTRL_OFFSET, 1);
368 if (rc < 0) {
369 dev_err(rtc_dd->rtc_dev, "RTC Alarm control register read "
370 "failed\n");
371 goto rtc_alarm_handled;
372 }
373
374 ctrl_reg &= ~PM8xxx_RTC_ALARM_CLEAR;
375 rc = pm8xxx_write_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base +
376 PM8XXX_ALARM_CTRL_OFFSET, 1);
377 if (rc < 0)
378 dev_err(rtc_dd->rtc_dev, "Write to RTC Alarm control register"
379 " failed\n");
380
381rtc_alarm_handled:
382 return IRQ_HANDLED;
383}
384
385static int __devinit pm8xxx_rtc_probe(struct platform_device *pdev)
386{
387 int rc;
388 u8 ctrl_reg;
389 bool rtc_write_enable = false;
390 struct pm8xxx_rtc *rtc_dd;
391 struct resource *rtc_resource;
392 const struct pm8xxx_rtc_platform_data *pdata =
393 dev_get_platdata(&pdev->dev);
394
395 if (pdata != NULL)
396 rtc_write_enable = pdata->rtc_write_enable;
397
398 rtc_dd = kzalloc(sizeof(*rtc_dd), GFP_KERNEL);
399 if (rtc_dd == NULL) {
400 dev_err(&pdev->dev, "Unable to allocate memory!\n");
401 return -ENOMEM;
402 }
403
404 /* Initialise spinlock to protect RTC control register */
405 spin_lock_init(&rtc_dd->ctrl_reg_lock);
406
407 rtc_dd->rtc_alarm_irq = platform_get_irq(pdev, 0);
408 if (rtc_dd->rtc_alarm_irq < 0) {
409 dev_err(&pdev->dev, "Alarm IRQ resource absent!\n");
410 rc = -ENXIO;
411 goto fail_rtc_enable;
412 }
413
414 rtc_resource = platform_get_resource_byname(pdev, IORESOURCE_IO,
415 "pmic_rtc_base");
416 if (!(rtc_resource && rtc_resource->start)) {
417 dev_err(&pdev->dev, "RTC IO resource absent!\n");
418 rc = -ENXIO;
419 goto fail_rtc_enable;
420 }
421
422 rtc_dd->rtc_base = rtc_resource->start;
423
424 /* Setup RTC register addresses */
425 rtc_dd->rtc_write_base = rtc_dd->rtc_base + PM8XXX_RTC_WRITE_OFFSET;
426 rtc_dd->rtc_read_base = rtc_dd->rtc_base + PM8XXX_RTC_READ_OFFSET;
427 rtc_dd->alarm_rw_base = rtc_dd->rtc_base + PM8XXX_ALARM_RW_OFFSET;
428
429 rtc_dd->rtc_dev = &pdev->dev;
430
431 /* Check if the RTC is on, else turn it on */
432 rc = pm8xxx_read_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base, 1);
433 if (rc < 0) {
434 dev_err(&pdev->dev, "RTC control register read failed!\n");
435 goto fail_rtc_enable;
436 }
437
438 if (!(ctrl_reg & PM8xxx_RTC_ENABLE)) {
439 ctrl_reg |= PM8xxx_RTC_ENABLE;
440 rc = pm8xxx_write_wrapper(rtc_dd, &ctrl_reg, rtc_dd->rtc_base,
441 1);
442 if (rc < 0) {
443 dev_err(&pdev->dev, "Write to RTC control register "
444 "failed\n");
445 goto fail_rtc_enable;
446 }
447 }
448
449 rtc_dd->ctrl_reg = ctrl_reg;
450 if (rtc_write_enable == true)
451 pm8xxx_rtc_ops.set_time = pm8xxx_rtc_set_time;
452
453 platform_set_drvdata(pdev, rtc_dd);
454
455 /* Register the RTC device */
456 rtc_dd->rtc = rtc_device_register("pm8xxx_rtc", &pdev->dev,
457 &pm8xxx_rtc_ops, THIS_MODULE);
458 if (IS_ERR(rtc_dd->rtc)) {
459 dev_err(&pdev->dev, "%s: RTC registration failed (%ld)\n",
460 __func__, PTR_ERR(rtc_dd->rtc));
461 rc = PTR_ERR(rtc_dd->rtc);
462 goto fail_rtc_enable;
463 }
464
465 /* Request the alarm IRQ */
466 rc = request_any_context_irq(rtc_dd->rtc_alarm_irq,
467 pm8xxx_alarm_trigger, IRQF_TRIGGER_RISING,
468 "pm8xxx_rtc_alarm", rtc_dd);
469 if (rc < 0) {
470 dev_err(&pdev->dev, "Request IRQ failed (%d)\n", rc);
471 goto fail_req_irq;
472 }
473
474 device_init_wakeup(&pdev->dev, 1);
475
476 dev_dbg(&pdev->dev, "Probe success !!\n");
477
478 return 0;
479
480fail_req_irq:
481 rtc_device_unregister(rtc_dd->rtc);
482fail_rtc_enable:
483 platform_set_drvdata(pdev, NULL);
484 kfree(rtc_dd);
485 return rc;
486}
487
488static int __devexit pm8xxx_rtc_remove(struct platform_device *pdev)
489{
490 struct pm8xxx_rtc *rtc_dd = platform_get_drvdata(pdev);
491
492 device_init_wakeup(&pdev->dev, 0);
493 free_irq(rtc_dd->rtc_alarm_irq, rtc_dd);
494 rtc_device_unregister(rtc_dd->rtc);
495 platform_set_drvdata(pdev, NULL);
496 kfree(rtc_dd);
497
498 return 0;
499}
500
501#ifdef CONFIG_PM_SLEEP
502static int pm8xxx_rtc_resume(struct device *dev)
503{
504 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
505
506 if (device_may_wakeup(dev))
507 disable_irq_wake(rtc_dd->rtc_alarm_irq);
508
509 return 0;
510}
511
512static int pm8xxx_rtc_suspend(struct device *dev)
513{
514 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
515
516 if (device_may_wakeup(dev))
517 enable_irq_wake(rtc_dd->rtc_alarm_irq);
518
519 return 0;
520}
521#endif
522
523SIMPLE_DEV_PM_OPS(pm8xxx_rtc_pm_ops, pm8xxx_rtc_suspend, pm8xxx_rtc_resume);
524
525static struct platform_driver pm8xxx_rtc_driver = {
526 .probe = pm8xxx_rtc_probe,
527 .remove = __devexit_p(pm8xxx_rtc_remove),
528 .driver = {
529 .name = PM8XXX_RTC_DEV_NAME,
530 .owner = THIS_MODULE,
531 .pm = &pm8xxx_rtc_pm_ops,
532 },
533};
534
535static int __init pm8xxx_rtc_init(void)
536{
537 return platform_driver_register(&pm8xxx_rtc_driver);
538}
539module_init(pm8xxx_rtc_init);
540
541static void __exit pm8xxx_rtc_exit(void)
542{
543 platform_driver_unregister(&pm8xxx_rtc_driver);
544}
545module_exit(pm8xxx_rtc_exit);
546
547MODULE_ALIAS("platform:rtc-pm8xxx");
548MODULE_DESCRIPTION("PMIC8xxx RTC driver");
549MODULE_LICENSE("GPL v2");
550MODULE_AUTHOR("Anirudh Ghayal <aghayal@codeaurora.org>");
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>");