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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
523static SIMPLE_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
535module_platform_driver(pm8xxx_rtc_driver);
536
537MODULE_ALIAS("platform:rtc-pm8xxx");
538MODULE_DESCRIPTION("PMIC8xxx RTC driver");
539MODULE_LICENSE("GPL v2");
540MODULE_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/regmap.h>
11#include <linux/slab.h>
12#include <linux/spinlock.h>
13
14/* RTC Register offsets from RTC CTRL REG */
15#define PM8XXX_ALARM_CTRL_OFFSET 0x01
16#define PM8XXX_RTC_WRITE_OFFSET 0x02
17#define PM8XXX_RTC_READ_OFFSET 0x06
18#define PM8XXX_ALARM_RW_OFFSET 0x0A
19
20/* RTC_CTRL register bit fields */
21#define PM8xxx_RTC_ENABLE BIT(7)
22#define PM8xxx_RTC_ALARM_CLEAR BIT(0)
23
24#define NUM_8_BIT_RTC_REGS 0x4
25
26/**
27 * struct pm8xxx_rtc_regs - describe RTC registers per PMIC versions
28 * @ctrl: base address of control register
29 * @write: base address of write register
30 * @read: base address of read register
31 * @alarm_ctrl: base address of alarm control register
32 * @alarm_ctrl2: base address of alarm control2 register
33 * @alarm_rw: base address of alarm read-write register
34 * @alarm_en: alarm enable mask
35 */
36struct pm8xxx_rtc_regs {
37 unsigned int ctrl;
38 unsigned int write;
39 unsigned int read;
40 unsigned int alarm_ctrl;
41 unsigned int alarm_ctrl2;
42 unsigned int alarm_rw;
43 unsigned int alarm_en;
44};
45
46/**
47 * struct pm8xxx_rtc - rtc driver internal structure
48 * @rtc: rtc device for this driver.
49 * @regmap: regmap used to access RTC registers
50 * @allow_set_time: indicates whether writing to the RTC is allowed
51 * @rtc_alarm_irq: rtc alarm irq number.
52 * @regs: rtc registers description.
53 * @rtc_dev: device structure.
54 * @ctrl_reg_lock: spinlock protecting access to ctrl_reg.
55 */
56struct pm8xxx_rtc {
57 struct rtc_device *rtc;
58 struct regmap *regmap;
59 bool allow_set_time;
60 int rtc_alarm_irq;
61 const struct pm8xxx_rtc_regs *regs;
62 struct device *rtc_dev;
63 spinlock_t ctrl_reg_lock;
64};
65
66/*
67 * Steps to write the RTC registers.
68 * 1. Disable alarm if enabled.
69 * 2. Disable rtc if enabled.
70 * 3. Write 0x00 to LSB.
71 * 4. Write Byte[1], Byte[2], Byte[3] then Byte[0].
72 * 5. Enable rtc if disabled in step 2.
73 * 6. Enable alarm if disabled in step 1.
74 */
75static int pm8xxx_rtc_set_time(struct device *dev, struct rtc_time *tm)
76{
77 int rc, i;
78 unsigned long secs, irq_flags;
79 u8 value[NUM_8_BIT_RTC_REGS], alarm_enabled = 0, rtc_disabled = 0;
80 unsigned int ctrl_reg, rtc_ctrl_reg;
81 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
82 const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
83
84 if (!rtc_dd->allow_set_time)
85 return -EACCES;
86
87 secs = rtc_tm_to_time64(tm);
88
89 dev_dbg(dev, "Seconds value to be written to RTC = %lu\n", secs);
90
91 for (i = 0; i < NUM_8_BIT_RTC_REGS; i++) {
92 value[i] = secs & 0xFF;
93 secs >>= 8;
94 }
95
96 spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
97
98 rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl, &ctrl_reg);
99 if (rc)
100 goto rtc_rw_fail;
101
102 if (ctrl_reg & regs->alarm_en) {
103 alarm_enabled = 1;
104 ctrl_reg &= ~regs->alarm_en;
105 rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl, ctrl_reg);
106 if (rc) {
107 dev_err(dev, "Write to RTC Alarm control register failed\n");
108 goto rtc_rw_fail;
109 }
110 }
111
112 /* Disable RTC H/w before writing on RTC register */
113 rc = regmap_read(rtc_dd->regmap, regs->ctrl, &rtc_ctrl_reg);
114 if (rc)
115 goto rtc_rw_fail;
116
117 if (rtc_ctrl_reg & PM8xxx_RTC_ENABLE) {
118 rtc_disabled = 1;
119 rtc_ctrl_reg &= ~PM8xxx_RTC_ENABLE;
120 rc = regmap_write(rtc_dd->regmap, regs->ctrl, rtc_ctrl_reg);
121 if (rc) {
122 dev_err(dev, "Write to RTC control register failed\n");
123 goto rtc_rw_fail;
124 }
125 }
126
127 /* Write 0 to Byte[0] */
128 rc = regmap_write(rtc_dd->regmap, regs->write, 0);
129 if (rc) {
130 dev_err(dev, "Write to RTC write data register failed\n");
131 goto rtc_rw_fail;
132 }
133
134 /* Write Byte[1], Byte[2], Byte[3] */
135 rc = regmap_bulk_write(rtc_dd->regmap, regs->write + 1,
136 &value[1], sizeof(value) - 1);
137 if (rc) {
138 dev_err(dev, "Write to RTC write data register failed\n");
139 goto rtc_rw_fail;
140 }
141
142 /* Write Byte[0] */
143 rc = regmap_write(rtc_dd->regmap, regs->write, value[0]);
144 if (rc) {
145 dev_err(dev, "Write to RTC write data register failed\n");
146 goto rtc_rw_fail;
147 }
148
149 /* Enable RTC H/w after writing on RTC register */
150 if (rtc_disabled) {
151 rtc_ctrl_reg |= PM8xxx_RTC_ENABLE;
152 rc = regmap_write(rtc_dd->regmap, regs->ctrl, rtc_ctrl_reg);
153 if (rc) {
154 dev_err(dev, "Write to RTC control register failed\n");
155 goto rtc_rw_fail;
156 }
157 }
158
159 if (alarm_enabled) {
160 ctrl_reg |= regs->alarm_en;
161 rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl, ctrl_reg);
162 if (rc) {
163 dev_err(dev, "Write to RTC Alarm control register failed\n");
164 goto rtc_rw_fail;
165 }
166 }
167
168rtc_rw_fail:
169 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
170
171 return rc;
172}
173
174static int pm8xxx_rtc_read_time(struct device *dev, struct rtc_time *tm)
175{
176 int rc;
177 u8 value[NUM_8_BIT_RTC_REGS];
178 unsigned long secs;
179 unsigned int reg;
180 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
181 const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
182
183 rc = regmap_bulk_read(rtc_dd->regmap, regs->read, value, sizeof(value));
184 if (rc) {
185 dev_err(dev, "RTC read data register failed\n");
186 return rc;
187 }
188
189 /*
190 * Read the LSB again and check if there has been a carry over.
191 * If there is, redo the read operation.
192 */
193 rc = regmap_read(rtc_dd->regmap, regs->read, ®);
194 if (rc < 0) {
195 dev_err(dev, "RTC read data register failed\n");
196 return rc;
197 }
198
199 if (unlikely(reg < value[0])) {
200 rc = regmap_bulk_read(rtc_dd->regmap, regs->read,
201 value, sizeof(value));
202 if (rc) {
203 dev_err(dev, "RTC read data register failed\n");
204 return rc;
205 }
206 }
207
208 secs = value[0] | (value[1] << 8) | (value[2] << 16) |
209 ((unsigned long)value[3] << 24);
210
211 rtc_time64_to_tm(secs, tm);
212
213 dev_dbg(dev, "secs = %lu, h:m:s == %ptRt, y-m-d = %ptRdr\n", secs, tm, tm);
214
215 return 0;
216}
217
218static int pm8xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
219{
220 int rc, i;
221 u8 value[NUM_8_BIT_RTC_REGS];
222 unsigned int ctrl_reg;
223 unsigned long secs, irq_flags;
224 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
225 const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
226
227 secs = rtc_tm_to_time64(&alarm->time);
228
229 for (i = 0; i < NUM_8_BIT_RTC_REGS; i++) {
230 value[i] = secs & 0xFF;
231 secs >>= 8;
232 }
233
234 spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
235
236 rc = regmap_bulk_write(rtc_dd->regmap, regs->alarm_rw, value,
237 sizeof(value));
238 if (rc) {
239 dev_err(dev, "Write to RTC ALARM register failed\n");
240 goto rtc_rw_fail;
241 }
242
243 rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl, &ctrl_reg);
244 if (rc)
245 goto rtc_rw_fail;
246
247 if (alarm->enabled)
248 ctrl_reg |= regs->alarm_en;
249 else
250 ctrl_reg &= ~regs->alarm_en;
251
252 rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl, ctrl_reg);
253 if (rc) {
254 dev_err(dev, "Write to RTC alarm control register failed\n");
255 goto rtc_rw_fail;
256 }
257
258 dev_dbg(dev, "Alarm Set for h:m:s=%ptRt, y-m-d=%ptRdr\n",
259 &alarm->time, &alarm->time);
260rtc_rw_fail:
261 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
262 return rc;
263}
264
265static int pm8xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
266{
267 int rc;
268 u8 value[NUM_8_BIT_RTC_REGS];
269 unsigned long secs;
270 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
271 const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
272
273 rc = regmap_bulk_read(rtc_dd->regmap, regs->alarm_rw, value,
274 sizeof(value));
275 if (rc) {
276 dev_err(dev, "RTC alarm time read failed\n");
277 return rc;
278 }
279
280 secs = value[0] | (value[1] << 8) | (value[2] << 16) |
281 ((unsigned long)value[3] << 24);
282
283 rtc_time64_to_tm(secs, &alarm->time);
284
285 dev_dbg(dev, "Alarm set for - h:m:s=%ptRt, y-m-d=%ptRdr\n",
286 &alarm->time, &alarm->time);
287
288 return 0;
289}
290
291static int pm8xxx_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
292{
293 int rc;
294 unsigned long irq_flags;
295 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
296 const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
297 unsigned int ctrl_reg;
298 u8 value[NUM_8_BIT_RTC_REGS] = {0};
299
300 spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
301
302 rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl, &ctrl_reg);
303 if (rc)
304 goto rtc_rw_fail;
305
306 if (enable)
307 ctrl_reg |= regs->alarm_en;
308 else
309 ctrl_reg &= ~regs->alarm_en;
310
311 rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl, ctrl_reg);
312 if (rc) {
313 dev_err(dev, "Write to RTC control register failed\n");
314 goto rtc_rw_fail;
315 }
316
317 /* Clear Alarm register */
318 if (!enable) {
319 rc = regmap_bulk_write(rtc_dd->regmap, regs->alarm_rw, value,
320 sizeof(value));
321 if (rc) {
322 dev_err(dev, "Clear RTC ALARM register failed\n");
323 goto rtc_rw_fail;
324 }
325 }
326
327rtc_rw_fail:
328 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
329 return rc;
330}
331
332static const struct rtc_class_ops pm8xxx_rtc_ops = {
333 .read_time = pm8xxx_rtc_read_time,
334 .set_time = pm8xxx_rtc_set_time,
335 .set_alarm = pm8xxx_rtc_set_alarm,
336 .read_alarm = pm8xxx_rtc_read_alarm,
337 .alarm_irq_enable = pm8xxx_rtc_alarm_irq_enable,
338};
339
340static irqreturn_t pm8xxx_alarm_trigger(int irq, void *dev_id)
341{
342 struct pm8xxx_rtc *rtc_dd = dev_id;
343 const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
344 unsigned int ctrl_reg;
345 int rc;
346 unsigned long irq_flags;
347
348 rtc_update_irq(rtc_dd->rtc, 1, RTC_IRQF | RTC_AF);
349
350 spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);
351
352 /* Clear the alarm enable bit */
353 rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl, &ctrl_reg);
354 if (rc) {
355 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
356 goto rtc_alarm_handled;
357 }
358
359 ctrl_reg &= ~regs->alarm_en;
360
361 rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl, ctrl_reg);
362 if (rc) {
363 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
364 dev_err(rtc_dd->rtc_dev,
365 "Write to alarm control register failed\n");
366 goto rtc_alarm_handled;
367 }
368
369 spin_unlock_irqrestore(&rtc_dd->ctrl_reg_lock, irq_flags);
370
371 /* Clear RTC alarm register */
372 rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl2, &ctrl_reg);
373 if (rc) {
374 dev_err(rtc_dd->rtc_dev,
375 "RTC Alarm control2 register read failed\n");
376 goto rtc_alarm_handled;
377 }
378
379 ctrl_reg |= PM8xxx_RTC_ALARM_CLEAR;
380 rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl2, ctrl_reg);
381 if (rc)
382 dev_err(rtc_dd->rtc_dev,
383 "Write to RTC Alarm control2 register failed\n");
384
385rtc_alarm_handled:
386 return IRQ_HANDLED;
387}
388
389static int pm8xxx_rtc_enable(struct pm8xxx_rtc *rtc_dd)
390{
391 const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
392 unsigned int ctrl_reg;
393 int rc;
394
395 /* Check if the RTC is on, else turn it on */
396 rc = regmap_read(rtc_dd->regmap, regs->ctrl, &ctrl_reg);
397 if (rc)
398 return rc;
399
400 if (!(ctrl_reg & PM8xxx_RTC_ENABLE)) {
401 ctrl_reg |= PM8xxx_RTC_ENABLE;
402 rc = regmap_write(rtc_dd->regmap, regs->ctrl, ctrl_reg);
403 if (rc)
404 return rc;
405 }
406
407 return 0;
408}
409
410static const struct pm8xxx_rtc_regs pm8921_regs = {
411 .ctrl = 0x11d,
412 .write = 0x11f,
413 .read = 0x123,
414 .alarm_rw = 0x127,
415 .alarm_ctrl = 0x11d,
416 .alarm_ctrl2 = 0x11e,
417 .alarm_en = BIT(1),
418};
419
420static const struct pm8xxx_rtc_regs pm8058_regs = {
421 .ctrl = 0x1e8,
422 .write = 0x1ea,
423 .read = 0x1ee,
424 .alarm_rw = 0x1f2,
425 .alarm_ctrl = 0x1e8,
426 .alarm_ctrl2 = 0x1e9,
427 .alarm_en = BIT(1),
428};
429
430static const struct pm8xxx_rtc_regs pm8941_regs = {
431 .ctrl = 0x6046,
432 .write = 0x6040,
433 .read = 0x6048,
434 .alarm_rw = 0x6140,
435 .alarm_ctrl = 0x6146,
436 .alarm_ctrl2 = 0x6148,
437 .alarm_en = BIT(7),
438};
439
440/*
441 * Hardcoded RTC bases until IORESOURCE_REG mapping is figured out
442 */
443static const struct of_device_id pm8xxx_id_table[] = {
444 { .compatible = "qcom,pm8921-rtc", .data = &pm8921_regs },
445 { .compatible = "qcom,pm8018-rtc", .data = &pm8921_regs },
446 { .compatible = "qcom,pm8058-rtc", .data = &pm8058_regs },
447 { .compatible = "qcom,pm8941-rtc", .data = &pm8941_regs },
448 { },
449};
450MODULE_DEVICE_TABLE(of, pm8xxx_id_table);
451
452static int pm8xxx_rtc_probe(struct platform_device *pdev)
453{
454 int rc;
455 struct pm8xxx_rtc *rtc_dd;
456 const struct of_device_id *match;
457
458 match = of_match_node(pm8xxx_id_table, pdev->dev.of_node);
459 if (!match)
460 return -ENXIO;
461
462 rtc_dd = devm_kzalloc(&pdev->dev, sizeof(*rtc_dd), GFP_KERNEL);
463 if (rtc_dd == NULL)
464 return -ENOMEM;
465
466 /* Initialise spinlock to protect RTC control register */
467 spin_lock_init(&rtc_dd->ctrl_reg_lock);
468
469 rtc_dd->regmap = dev_get_regmap(pdev->dev.parent, NULL);
470 if (!rtc_dd->regmap) {
471 dev_err(&pdev->dev, "Parent regmap unavailable.\n");
472 return -ENXIO;
473 }
474
475 rtc_dd->rtc_alarm_irq = platform_get_irq(pdev, 0);
476 if (rtc_dd->rtc_alarm_irq < 0)
477 return -ENXIO;
478
479 rtc_dd->allow_set_time = of_property_read_bool(pdev->dev.of_node,
480 "allow-set-time");
481
482 rtc_dd->regs = match->data;
483 rtc_dd->rtc_dev = &pdev->dev;
484
485 rc = pm8xxx_rtc_enable(rtc_dd);
486 if (rc)
487 return rc;
488
489 platform_set_drvdata(pdev, rtc_dd);
490
491 device_init_wakeup(&pdev->dev, 1);
492
493 /* Register the RTC device */
494 rtc_dd->rtc = devm_rtc_allocate_device(&pdev->dev);
495 if (IS_ERR(rtc_dd->rtc))
496 return PTR_ERR(rtc_dd->rtc);
497
498 rtc_dd->rtc->ops = &pm8xxx_rtc_ops;
499 rtc_dd->rtc->range_max = U32_MAX;
500
501 /* Request the alarm IRQ */
502 rc = devm_request_any_context_irq(&pdev->dev, rtc_dd->rtc_alarm_irq,
503 pm8xxx_alarm_trigger,
504 IRQF_TRIGGER_RISING,
505 "pm8xxx_rtc_alarm", rtc_dd);
506 if (rc < 0) {
507 dev_err(&pdev->dev, "Request IRQ failed (%d)\n", rc);
508 return rc;
509 }
510
511 return rtc_register_device(rtc_dd->rtc);
512}
513
514#ifdef CONFIG_PM_SLEEP
515static int pm8xxx_rtc_resume(struct device *dev)
516{
517 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
518
519 if (device_may_wakeup(dev))
520 disable_irq_wake(rtc_dd->rtc_alarm_irq);
521
522 return 0;
523}
524
525static int pm8xxx_rtc_suspend(struct device *dev)
526{
527 struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
528
529 if (device_may_wakeup(dev))
530 enable_irq_wake(rtc_dd->rtc_alarm_irq);
531
532 return 0;
533}
534#endif
535
536static SIMPLE_DEV_PM_OPS(pm8xxx_rtc_pm_ops,
537 pm8xxx_rtc_suspend,
538 pm8xxx_rtc_resume);
539
540static struct platform_driver pm8xxx_rtc_driver = {
541 .probe = pm8xxx_rtc_probe,
542 .driver = {
543 .name = "rtc-pm8xxx",
544 .pm = &pm8xxx_rtc_pm_ops,
545 .of_match_table = pm8xxx_id_table,
546 },
547};
548
549module_platform_driver(pm8xxx_rtc_driver);
550
551MODULE_ALIAS("platform:rtc-pm8xxx");
552MODULE_DESCRIPTION("PMIC8xxx RTC driver");
553MODULE_LICENSE("GPL v2");
554MODULE_AUTHOR("Anirudh Ghayal <aghayal@codeaurora.org>");