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13#include <linux/kernel.h>
14#include <linux/errno.h>
15#include <linux/init.h>
16#include <linux/module.h>
17#include <linux/types.h>
18#include <linux/rtc.h>
19#include <linux/bcd.h>
20#include <linux/math64.h>
21#include <linux/property.h>
22#include <linux/platform_device.h>
23#include <linux/interrupt.h>
24#include <linux/mfd/tps65910.h>
25
26struct tps65910_rtc {
27 struct rtc_device *rtc;
28 int irq;
29};
30
31
32#define NUM_TIME_REGS (TPS65910_YEARS - TPS65910_SECONDS + 1)
33
34
35#define NUM_COMP_REGS (TPS65910_RTC_COMP_MSB - TPS65910_RTC_COMP_LSB + 1)
36
37
38#define MIN_OFFSET (-277761)
39#define MAX_OFFSET (277778)
40
41
42#define TICKS_PER_HOUR (32768 * 3600)
43
44
45#define PPB_MULT (1000000000LL)
46
47static int tps65910_rtc_alarm_irq_enable(struct device *dev,
48 unsigned int enabled)
49{
50 struct tps65910 *tps = dev_get_drvdata(dev->parent);
51 u8 val = 0;
52
53 if (enabled)
54 val = TPS65910_RTC_INTERRUPTS_IT_ALARM;
55
56 return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, val);
57}
58
59
60
61
62
63
64
65
66
67
68static int tps65910_rtc_read_time(struct device *dev, struct rtc_time *tm)
69{
70 unsigned char rtc_data[NUM_TIME_REGS];
71 struct tps65910 *tps = dev_get_drvdata(dev->parent);
72 int ret;
73
74
75 ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
76 TPS65910_RTC_CTRL_GET_TIME, TPS65910_RTC_CTRL_GET_TIME);
77 if (ret < 0) {
78 dev_err(dev, "RTC CTRL reg update failed with err:%d\n", ret);
79 return ret;
80 }
81
82 ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, rtc_data,
83 NUM_TIME_REGS);
84 if (ret < 0) {
85 dev_err(dev, "reading from RTC failed with err:%d\n", ret);
86 return ret;
87 }
88
89 tm->tm_sec = bcd2bin(rtc_data[0]);
90 tm->tm_min = bcd2bin(rtc_data[1]);
91 tm->tm_hour = bcd2bin(rtc_data[2]);
92 tm->tm_mday = bcd2bin(rtc_data[3]);
93 tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
94 tm->tm_year = bcd2bin(rtc_data[5]) + 100;
95
96 return ret;
97}
98
99static int tps65910_rtc_set_time(struct device *dev, struct rtc_time *tm)
100{
101 unsigned char rtc_data[NUM_TIME_REGS];
102 struct tps65910 *tps = dev_get_drvdata(dev->parent);
103 int ret;
104
105 rtc_data[0] = bin2bcd(tm->tm_sec);
106 rtc_data[1] = bin2bcd(tm->tm_min);
107 rtc_data[2] = bin2bcd(tm->tm_hour);
108 rtc_data[3] = bin2bcd(tm->tm_mday);
109 rtc_data[4] = bin2bcd(tm->tm_mon + 1);
110 rtc_data[5] = bin2bcd(tm->tm_year - 100);
111
112
113 ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
114 TPS65910_RTC_CTRL_STOP_RTC, 0);
115 if (ret < 0) {
116 dev_err(dev, "RTC stop failed with err:%d\n", ret);
117 return ret;
118 }
119
120
121 ret = regmap_bulk_write(tps->regmap, TPS65910_SECONDS, rtc_data,
122 NUM_TIME_REGS);
123 if (ret < 0) {
124 dev_err(dev, "rtc_set_time error %d\n", ret);
125 return ret;
126 }
127
128
129 ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
130 TPS65910_RTC_CTRL_STOP_RTC, 1);
131 if (ret < 0)
132 dev_err(dev, "RTC start failed with err:%d\n", ret);
133
134 return ret;
135}
136
137
138
139
140static int tps65910_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
141{
142 unsigned char alarm_data[NUM_TIME_REGS];
143 u32 int_val;
144 struct tps65910 *tps = dev_get_drvdata(dev->parent);
145 int ret;
146
147 ret = regmap_bulk_read(tps->regmap, TPS65910_ALARM_SECONDS, alarm_data,
148 NUM_TIME_REGS);
149 if (ret < 0) {
150 dev_err(dev, "rtc_read_alarm error %d\n", ret);
151 return ret;
152 }
153
154 alm->time.tm_sec = bcd2bin(alarm_data[0]);
155 alm->time.tm_min = bcd2bin(alarm_data[1]);
156 alm->time.tm_hour = bcd2bin(alarm_data[2]);
157 alm->time.tm_mday = bcd2bin(alarm_data[3]);
158 alm->time.tm_mon = bcd2bin(alarm_data[4]) - 1;
159 alm->time.tm_year = bcd2bin(alarm_data[5]) + 100;
160
161 ret = regmap_read(tps->regmap, TPS65910_RTC_INTERRUPTS, &int_val);
162 if (ret < 0)
163 return ret;
164
165 if (int_val & TPS65910_RTC_INTERRUPTS_IT_ALARM)
166 alm->enabled = 1;
167
168 return ret;
169}
170
171static int tps65910_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
172{
173 unsigned char alarm_data[NUM_TIME_REGS];
174 struct tps65910 *tps = dev_get_drvdata(dev->parent);
175 int ret;
176
177 ret = tps65910_rtc_alarm_irq_enable(dev, 0);
178 if (ret)
179 return ret;
180
181 alarm_data[0] = bin2bcd(alm->time.tm_sec);
182 alarm_data[1] = bin2bcd(alm->time.tm_min);
183 alarm_data[2] = bin2bcd(alm->time.tm_hour);
184 alarm_data[3] = bin2bcd(alm->time.tm_mday);
185 alarm_data[4] = bin2bcd(alm->time.tm_mon + 1);
186 alarm_data[5] = bin2bcd(alm->time.tm_year - 100);
187
188
189 ret = regmap_bulk_write(tps->regmap, TPS65910_ALARM_SECONDS,
190 alarm_data, NUM_TIME_REGS);
191 if (ret) {
192 dev_err(dev, "rtc_set_alarm error %d\n", ret);
193 return ret;
194 }
195
196 if (alm->enabled)
197 ret = tps65910_rtc_alarm_irq_enable(dev, 1);
198
199 return ret;
200}
201
202static int tps65910_rtc_set_calibration(struct device *dev, int calibration)
203{
204 unsigned char comp_data[NUM_COMP_REGS];
205 struct tps65910 *tps = dev_get_drvdata(dev->parent);
206 s16 value;
207 int ret;
208
209
210
211
212
213
214
215
216
217
218
219 if ((calibration < -32768) || (calibration > 32766)) {
220 dev_err(dev, "RTC calibration value out of range: %d\n",
221 calibration);
222 return -EINVAL;
223 }
224
225 value = (s16)calibration;
226
227 comp_data[0] = (u16)value & 0xFF;
228 comp_data[1] = ((u16)value >> 8) & 0xFF;
229
230
231 ret = regmap_bulk_write(tps->regmap, TPS65910_RTC_COMP_LSB,
232 comp_data, NUM_COMP_REGS);
233 if (ret < 0) {
234 dev_err(dev, "rtc_set_calibration error: %d\n", ret);
235 return ret;
236 }
237
238
239 ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
240 TPS65910_RTC_CTRL_AUTO_COMP, TPS65910_RTC_CTRL_AUTO_COMP);
241 if (ret < 0)
242 dev_err(dev, "auto_comp enable failed with error: %d\n", ret);
243
244 return ret;
245}
246
247static int tps65910_rtc_get_calibration(struct device *dev, int *calibration)
248{
249 unsigned char comp_data[NUM_COMP_REGS];
250 struct tps65910 *tps = dev_get_drvdata(dev->parent);
251 unsigned int ctrl;
252 u16 value;
253 int ret;
254
255 ret = regmap_read(tps->regmap, TPS65910_RTC_CTRL, &ctrl);
256 if (ret < 0)
257 return ret;
258
259
260 if (!(ctrl & TPS65910_RTC_CTRL_AUTO_COMP)) {
261 *calibration = 0;
262 return 0;
263 }
264
265 ret = regmap_bulk_read(tps->regmap, TPS65910_RTC_COMP_LSB, comp_data,
266 NUM_COMP_REGS);
267 if (ret < 0) {
268 dev_err(dev, "rtc_get_calibration error: %d\n", ret);
269 return ret;
270 }
271
272 value = (u16)comp_data[0] | ((u16)comp_data[1] << 8);
273
274 *calibration = (s16)value;
275
276 return 0;
277}
278
279static int tps65910_read_offset(struct device *dev, long *offset)
280{
281 int calibration;
282 s64 tmp;
283 int ret;
284
285 ret = tps65910_rtc_get_calibration(dev, &calibration);
286 if (ret < 0)
287 return ret;
288
289
290 tmp = calibration * (s64)PPB_MULT;
291 if (tmp < 0)
292 tmp -= TICKS_PER_HOUR / 2LL;
293 else
294 tmp += TICKS_PER_HOUR / 2LL;
295 tmp = div_s64(tmp, TICKS_PER_HOUR);
296
297
298 *offset = (long)-tmp;
299
300 return 0;
301}
302
303static int tps65910_set_offset(struct device *dev, long offset)
304{
305 int calibration;
306 s64 tmp;
307 int ret;
308
309
310 if (offset < MIN_OFFSET || offset > MAX_OFFSET)
311 return -ERANGE;
312
313
314 tmp = offset * (s64)TICKS_PER_HOUR;
315 if (tmp < 0)
316 tmp -= PPB_MULT / 2LL;
317 else
318 tmp += PPB_MULT / 2LL;
319 tmp = div_s64(tmp, PPB_MULT);
320
321
322 calibration = (int)-tmp;
323
324 ret = tps65910_rtc_set_calibration(dev, calibration);
325
326 return ret;
327}
328
329static irqreturn_t tps65910_rtc_interrupt(int irq, void *rtc)
330{
331 struct device *dev = rtc;
332 unsigned long events = 0;
333 struct tps65910 *tps = dev_get_drvdata(dev->parent);
334 struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev);
335 int ret;
336 u32 rtc_reg;
337
338 ret = regmap_read(tps->regmap, TPS65910_RTC_STATUS, &rtc_reg);
339 if (ret)
340 return IRQ_NONE;
341
342 if (rtc_reg & TPS65910_RTC_STATUS_ALARM)
343 events = RTC_IRQF | RTC_AF;
344
345 ret = regmap_write(tps->regmap, TPS65910_RTC_STATUS, rtc_reg);
346 if (ret)
347 return IRQ_NONE;
348
349
350 rtc_update_irq(tps_rtc->rtc, 1, events);
351
352 return IRQ_HANDLED;
353}
354
355static const struct rtc_class_ops tps65910_rtc_ops = {
356 .read_time = tps65910_rtc_read_time,
357 .set_time = tps65910_rtc_set_time,
358 .read_alarm = tps65910_rtc_read_alarm,
359 .set_alarm = tps65910_rtc_set_alarm,
360 .alarm_irq_enable = tps65910_rtc_alarm_irq_enable,
361 .read_offset = tps65910_read_offset,
362 .set_offset = tps65910_set_offset,
363};
364
365static int tps65910_rtc_probe(struct platform_device *pdev)
366{
367 struct tps65910 *tps65910 = NULL;
368 struct tps65910_rtc *tps_rtc = NULL;
369 int ret;
370 int irq;
371 u32 rtc_reg;
372
373 tps65910 = dev_get_drvdata(pdev->dev.parent);
374
375 tps_rtc = devm_kzalloc(&pdev->dev, sizeof(struct tps65910_rtc),
376 GFP_KERNEL);
377 if (!tps_rtc)
378 return -ENOMEM;
379
380 tps_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
381 if (IS_ERR(tps_rtc->rtc))
382 return PTR_ERR(tps_rtc->rtc);
383
384
385 ret = regmap_read(tps65910->regmap, TPS65910_RTC_STATUS, &rtc_reg);
386 if (ret < 0)
387 return ret;
388
389 ret = regmap_write(tps65910->regmap, TPS65910_RTC_STATUS, rtc_reg);
390 if (ret < 0)
391 return ret;
392
393 dev_dbg(&pdev->dev, "Enabling rtc-tps65910.\n");
394
395
396 ret = regmap_update_bits(tps65910->regmap, TPS65910_DEVCTRL,
397 DEVCTRL_RTC_PWDN_MASK, 0 << DEVCTRL_RTC_PWDN_SHIFT);
398 if (ret < 0)
399 return ret;
400
401 rtc_reg = TPS65910_RTC_CTRL_STOP_RTC;
402 ret = regmap_write(tps65910->regmap, TPS65910_RTC_CTRL, rtc_reg);
403 if (ret < 0)
404 return ret;
405
406 platform_set_drvdata(pdev, tps_rtc);
407
408 irq = platform_get_irq(pdev, 0);
409 if (irq <= 0) {
410 dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n",
411 irq);
412 return -ENXIO;
413 }
414
415 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
416 tps65910_rtc_interrupt, IRQF_TRIGGER_LOW,
417 dev_name(&pdev->dev), &pdev->dev);
418 if (ret < 0)
419 irq = -1;
420
421 tps_rtc->irq = irq;
422 if (irq != -1) {
423 if (device_property_present(tps65910->dev, "wakeup-source"))
424 device_init_wakeup(&pdev->dev, 1);
425 else
426 device_set_wakeup_capable(&pdev->dev, 1);
427 } else {
428 clear_bit(RTC_FEATURE_ALARM, tps_rtc->rtc->features);
429 }
430
431 tps_rtc->rtc->ops = &tps65910_rtc_ops;
432 tps_rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
433 tps_rtc->rtc->range_max = RTC_TIMESTAMP_END_2099;
434
435 return devm_rtc_register_device(tps_rtc->rtc);
436}
437
438#ifdef CONFIG_PM_SLEEP
439static int tps65910_rtc_suspend(struct device *dev)
440{
441 struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev);
442
443 if (device_may_wakeup(dev))
444 enable_irq_wake(tps_rtc->irq);
445 return 0;
446}
447
448static int tps65910_rtc_resume(struct device *dev)
449{
450 struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev);
451
452 if (device_may_wakeup(dev))
453 disable_irq_wake(tps_rtc->irq);
454 return 0;
455}
456#endif
457
458static SIMPLE_DEV_PM_OPS(tps65910_rtc_pm_ops, tps65910_rtc_suspend,
459 tps65910_rtc_resume);
460
461static struct platform_driver tps65910_rtc_driver = {
462 .probe = tps65910_rtc_probe,
463 .driver = {
464 .name = "tps65910-rtc",
465 .pm = &tps65910_rtc_pm_ops,
466 },
467};
468
469module_platform_driver(tps65910_rtc_driver);
470MODULE_ALIAS("platform:rtc-tps65910");
471MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
472MODULE_LICENSE("GPL");
473
