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15#include <linux/delay.h>
16#include <linux/init.h>
17#include <linux/interrupt.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/of.h>
21#include <linux/platform_device.h>
22#include <linux/regmap.h>
23#include <linux/rtc.h>
24#include <linux/slab.h>
25
26#include <linux/mfd/da9062/registers.h>
27#include <linux/mfd/da9063/registers.h>
28#include <linux/mfd/da9063/core.h>
29
30#define YEARS_TO_DA9063(year) ((year) - 100)
31#define MONTHS_TO_DA9063(month) ((month) + 1)
32#define YEARS_FROM_DA9063(year) ((year) + 100)
33#define MONTHS_FROM_DA9063(month) ((month) - 1)
34
35enum {
36 RTC_SEC = 0,
37 RTC_MIN = 1,
38 RTC_HOUR = 2,
39 RTC_DAY = 3,
40 RTC_MONTH = 4,
41 RTC_YEAR = 5,
42 RTC_DATA_LEN
43};
44
45struct da9063_compatible_rtc_regmap {
46
47 int rtc_enable_reg;
48 int rtc_enable_32k_crystal_reg;
49 int rtc_alarm_secs_reg;
50 int rtc_alarm_year_reg;
51 int rtc_count_secs_reg;
52 int rtc_count_year_reg;
53 int rtc_event_reg;
54
55 int rtc_enable_mask;
56 int rtc_crystal_mask;
57 int rtc_event_alarm_mask;
58 int rtc_alarm_on_mask;
59 int rtc_alarm_status_mask;
60 int rtc_tick_on_mask;
61 int rtc_ready_to_read_mask;
62 int rtc_count_sec_mask;
63 int rtc_count_min_mask;
64 int rtc_count_hour_mask;
65 int rtc_count_day_mask;
66 int rtc_count_month_mask;
67 int rtc_count_year_mask;
68
69 int rtc_data_start;
70 int rtc_alarm_len;
71};
72
73struct da9063_compatible_rtc {
74 struct rtc_device *rtc_dev;
75 struct rtc_time alarm_time;
76 struct regmap *regmap;
77 const struct da9063_compatible_rtc_regmap *config;
78 bool rtc_sync;
79};
80
81static const struct da9063_compatible_rtc_regmap da9063_ad_regs = {
82
83 .rtc_enable_reg = DA9063_REG_CONTROL_E,
84 .rtc_alarm_secs_reg = DA9063_AD_REG_ALARM_MI,
85 .rtc_alarm_year_reg = DA9063_AD_REG_ALARM_Y,
86 .rtc_count_secs_reg = DA9063_REG_COUNT_S,
87 .rtc_count_year_reg = DA9063_REG_COUNT_Y,
88 .rtc_event_reg = DA9063_REG_EVENT_A,
89
90 .rtc_enable_mask = DA9063_RTC_EN,
91 .rtc_crystal_mask = DA9063_CRYSTAL,
92 .rtc_enable_32k_crystal_reg = DA9063_REG_EN_32K,
93 .rtc_event_alarm_mask = DA9063_E_ALARM,
94 .rtc_alarm_on_mask = DA9063_ALARM_ON,
95 .rtc_alarm_status_mask = DA9063_ALARM_STATUS_ALARM |
96 DA9063_ALARM_STATUS_TICK,
97 .rtc_tick_on_mask = DA9063_TICK_ON,
98 .rtc_ready_to_read_mask = DA9063_RTC_READ,
99 .rtc_count_sec_mask = DA9063_COUNT_SEC_MASK,
100 .rtc_count_min_mask = DA9063_COUNT_MIN_MASK,
101 .rtc_count_hour_mask = DA9063_COUNT_HOUR_MASK,
102 .rtc_count_day_mask = DA9063_COUNT_DAY_MASK,
103 .rtc_count_month_mask = DA9063_COUNT_MONTH_MASK,
104 .rtc_count_year_mask = DA9063_COUNT_YEAR_MASK,
105
106 .rtc_data_start = RTC_MIN,
107 .rtc_alarm_len = RTC_DATA_LEN - 1,
108};
109
110static const struct da9063_compatible_rtc_regmap da9063_bb_regs = {
111
112 .rtc_enable_reg = DA9063_REG_CONTROL_E,
113 .rtc_alarm_secs_reg = DA9063_BB_REG_ALARM_S,
114 .rtc_alarm_year_reg = DA9063_BB_REG_ALARM_Y,
115 .rtc_count_secs_reg = DA9063_REG_COUNT_S,
116 .rtc_count_year_reg = DA9063_REG_COUNT_Y,
117 .rtc_event_reg = DA9063_REG_EVENT_A,
118
119 .rtc_enable_mask = DA9063_RTC_EN,
120 .rtc_crystal_mask = DA9063_CRYSTAL,
121 .rtc_enable_32k_crystal_reg = DA9063_REG_EN_32K,
122 .rtc_event_alarm_mask = DA9063_E_ALARM,
123 .rtc_alarm_on_mask = DA9063_ALARM_ON,
124 .rtc_alarm_status_mask = DA9063_ALARM_STATUS_ALARM |
125 DA9063_ALARM_STATUS_TICK,
126 .rtc_tick_on_mask = DA9063_TICK_ON,
127 .rtc_ready_to_read_mask = DA9063_RTC_READ,
128 .rtc_count_sec_mask = DA9063_COUNT_SEC_MASK,
129 .rtc_count_min_mask = DA9063_COUNT_MIN_MASK,
130 .rtc_count_hour_mask = DA9063_COUNT_HOUR_MASK,
131 .rtc_count_day_mask = DA9063_COUNT_DAY_MASK,
132 .rtc_count_month_mask = DA9063_COUNT_MONTH_MASK,
133 .rtc_count_year_mask = DA9063_COUNT_YEAR_MASK,
134
135 .rtc_data_start = RTC_SEC,
136 .rtc_alarm_len = RTC_DATA_LEN,
137};
138
139static const struct da9063_compatible_rtc_regmap da9062_aa_regs = {
140
141 .rtc_enable_reg = DA9062AA_CONTROL_E,
142 .rtc_alarm_secs_reg = DA9062AA_ALARM_S,
143 .rtc_alarm_year_reg = DA9062AA_ALARM_Y,
144 .rtc_count_secs_reg = DA9062AA_COUNT_S,
145 .rtc_count_year_reg = DA9062AA_COUNT_Y,
146 .rtc_event_reg = DA9062AA_EVENT_A,
147
148 .rtc_enable_mask = DA9062AA_RTC_EN_MASK,
149 .rtc_crystal_mask = DA9062AA_CRYSTAL_MASK,
150 .rtc_enable_32k_crystal_reg = DA9062AA_EN_32K,
151 .rtc_event_alarm_mask = DA9062AA_M_ALARM_MASK,
152 .rtc_alarm_on_mask = DA9062AA_ALARM_ON_MASK,
153 .rtc_alarm_status_mask = (0x02 << 6),
154 .rtc_tick_on_mask = DA9062AA_TICK_ON_MASK,
155 .rtc_ready_to_read_mask = DA9062AA_RTC_READ_MASK,
156 .rtc_count_sec_mask = DA9062AA_COUNT_SEC_MASK,
157 .rtc_count_min_mask = DA9062AA_COUNT_MIN_MASK,
158 .rtc_count_hour_mask = DA9062AA_COUNT_HOUR_MASK,
159 .rtc_count_day_mask = DA9062AA_COUNT_DAY_MASK,
160 .rtc_count_month_mask = DA9062AA_COUNT_MONTH_MASK,
161 .rtc_count_year_mask = DA9062AA_COUNT_YEAR_MASK,
162
163 .rtc_data_start = RTC_SEC,
164 .rtc_alarm_len = RTC_DATA_LEN,
165};
166
167static const struct of_device_id da9063_compatible_reg_id_table[] = {
168 { .compatible = "dlg,da9063-rtc", .data = &da9063_bb_regs },
169 { .compatible = "dlg,da9062-rtc", .data = &da9062_aa_regs },
170 { },
171};
172MODULE_DEVICE_TABLE(of, da9063_compatible_reg_id_table);
173
174static void da9063_data_to_tm(u8 *data, struct rtc_time *tm,
175 struct da9063_compatible_rtc *rtc)
176{
177 const struct da9063_compatible_rtc_regmap *config = rtc->config;
178
179 tm->tm_sec = data[RTC_SEC] & config->rtc_count_sec_mask;
180 tm->tm_min = data[RTC_MIN] & config->rtc_count_min_mask;
181 tm->tm_hour = data[RTC_HOUR] & config->rtc_count_hour_mask;
182 tm->tm_mday = data[RTC_DAY] & config->rtc_count_day_mask;
183 tm->tm_mon = MONTHS_FROM_DA9063(data[RTC_MONTH] &
184 config->rtc_count_month_mask);
185 tm->tm_year = YEARS_FROM_DA9063(data[RTC_YEAR] &
186 config->rtc_count_year_mask);
187}
188
189static void da9063_tm_to_data(struct rtc_time *tm, u8 *data,
190 struct da9063_compatible_rtc *rtc)
191{
192 const struct da9063_compatible_rtc_regmap *config = rtc->config;
193
194 data[RTC_SEC] = tm->tm_sec & config->rtc_count_sec_mask;
195 data[RTC_MIN] = tm->tm_min & config->rtc_count_min_mask;
196 data[RTC_HOUR] = tm->tm_hour & config->rtc_count_hour_mask;
197 data[RTC_DAY] = tm->tm_mday & config->rtc_count_day_mask;
198 data[RTC_MONTH] = MONTHS_TO_DA9063(tm->tm_mon) &
199 config->rtc_count_month_mask;
200 data[RTC_YEAR] = YEARS_TO_DA9063(tm->tm_year) &
201 config->rtc_count_year_mask;
202}
203
204static int da9063_rtc_stop_alarm(struct device *dev)
205{
206 struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
207 const struct da9063_compatible_rtc_regmap *config = rtc->config;
208
209 return regmap_update_bits(rtc->regmap,
210 config->rtc_alarm_year_reg,
211 config->rtc_alarm_on_mask,
212 0);
213}
214
215static int da9063_rtc_start_alarm(struct device *dev)
216{
217 struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
218 const struct da9063_compatible_rtc_regmap *config = rtc->config;
219
220 return regmap_update_bits(rtc->regmap,
221 config->rtc_alarm_year_reg,
222 config->rtc_alarm_on_mask,
223 config->rtc_alarm_on_mask);
224}
225
226static int da9063_rtc_read_time(struct device *dev, struct rtc_time *tm)
227{
228 struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
229 const struct da9063_compatible_rtc_regmap *config = rtc->config;
230 unsigned long tm_secs;
231 unsigned long al_secs;
232 u8 data[RTC_DATA_LEN];
233 int ret;
234
235 ret = regmap_bulk_read(rtc->regmap,
236 config->rtc_count_secs_reg,
237 data, RTC_DATA_LEN);
238 if (ret < 0) {
239 dev_err(dev, "Failed to read RTC time data: %d\n", ret);
240 return ret;
241 }
242
243 if (!(data[RTC_SEC] & config->rtc_ready_to_read_mask)) {
244 dev_dbg(dev, "RTC not yet ready to be read by the host\n");
245 return -EINVAL;
246 }
247
248 da9063_data_to_tm(data, tm, rtc);
249
250 rtc_tm_to_time(tm, &tm_secs);
251 rtc_tm_to_time(&rtc->alarm_time, &al_secs);
252
253
254 if (rtc->rtc_sync == true && al_secs - tm_secs == 1)
255 memcpy(tm, &rtc->alarm_time, sizeof(struct rtc_time));
256 else
257 rtc->rtc_sync = false;
258
259 return rtc_valid_tm(tm);
260}
261
262static int da9063_rtc_set_time(struct device *dev, struct rtc_time *tm)
263{
264 struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
265 const struct da9063_compatible_rtc_regmap *config = rtc->config;
266 u8 data[RTC_DATA_LEN];
267 int ret;
268
269 da9063_tm_to_data(tm, data, rtc);
270 ret = regmap_bulk_write(rtc->regmap,
271 config->rtc_count_secs_reg,
272 data, RTC_DATA_LEN);
273 if (ret < 0)
274 dev_err(dev, "Failed to set RTC time data: %d\n", ret);
275
276 return ret;
277}
278
279static int da9063_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
280{
281 struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
282 const struct da9063_compatible_rtc_regmap *config = rtc->config;
283 u8 data[RTC_DATA_LEN];
284 int ret;
285 unsigned int val;
286
287 data[RTC_SEC] = 0;
288 ret = regmap_bulk_read(rtc->regmap,
289 config->rtc_alarm_secs_reg,
290 &data[config->rtc_data_start],
291 config->rtc_alarm_len);
292 if (ret < 0)
293 return ret;
294
295 da9063_data_to_tm(data, &alrm->time, rtc);
296
297 alrm->enabled = !!(data[RTC_YEAR] & config->rtc_alarm_on_mask);
298
299 ret = regmap_read(rtc->regmap,
300 config->rtc_event_reg,
301 &val);
302 if (ret < 0)
303 return ret;
304
305 if (val & config->rtc_event_alarm_mask)
306 alrm->pending = 1;
307 else
308 alrm->pending = 0;
309
310 return 0;
311}
312
313static int da9063_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
314{
315 struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
316 const struct da9063_compatible_rtc_regmap *config = rtc->config;
317 u8 data[RTC_DATA_LEN];
318 int ret;
319
320 da9063_tm_to_data(&alrm->time, data, rtc);
321
322 ret = da9063_rtc_stop_alarm(dev);
323 if (ret < 0) {
324 dev_err(dev, "Failed to stop alarm: %d\n", ret);
325 return ret;
326 }
327
328 ret = regmap_bulk_write(rtc->regmap,
329 config->rtc_alarm_secs_reg,
330 &data[config->rtc_data_start],
331 config->rtc_alarm_len);
332 if (ret < 0) {
333 dev_err(dev, "Failed to write alarm: %d\n", ret);
334 return ret;
335 }
336
337 da9063_data_to_tm(data, &rtc->alarm_time, rtc);
338
339 if (alrm->enabled) {
340 ret = da9063_rtc_start_alarm(dev);
341 if (ret < 0) {
342 dev_err(dev, "Failed to start alarm: %d\n", ret);
343 return ret;
344 }
345 }
346
347 return ret;
348}
349
350static int da9063_rtc_alarm_irq_enable(struct device *dev,
351 unsigned int enabled)
352{
353 if (enabled)
354 return da9063_rtc_start_alarm(dev);
355 else
356 return da9063_rtc_stop_alarm(dev);
357}
358
359static irqreturn_t da9063_alarm_event(int irq, void *data)
360{
361 struct da9063_compatible_rtc *rtc = data;
362 const struct da9063_compatible_rtc_regmap *config = rtc->config;
363
364 regmap_update_bits(rtc->regmap,
365 config->rtc_alarm_year_reg,
366 config->rtc_alarm_on_mask,
367 0);
368
369 rtc->rtc_sync = true;
370 rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);
371
372 return IRQ_HANDLED;
373}
374
375static const struct rtc_class_ops da9063_rtc_ops = {
376 .read_time = da9063_rtc_read_time,
377 .set_time = da9063_rtc_set_time,
378 .read_alarm = da9063_rtc_read_alarm,
379 .set_alarm = da9063_rtc_set_alarm,
380 .alarm_irq_enable = da9063_rtc_alarm_irq_enable,
381};
382
383static int da9063_rtc_probe(struct platform_device *pdev)
384{
385 struct da9063_compatible_rtc *rtc;
386 const struct da9063_compatible_rtc_regmap *config;
387 const struct of_device_id *match;
388 int irq_alarm;
389 u8 data[RTC_DATA_LEN];
390 int ret;
391
392 if (!pdev->dev.of_node)
393 return -ENXIO;
394
395 match = of_match_node(da9063_compatible_reg_id_table,
396 pdev->dev.of_node);
397
398 rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
399 if (!rtc)
400 return -ENOMEM;
401
402 rtc->config = match->data;
403 if (of_device_is_compatible(pdev->dev.of_node, "dlg,da9063-rtc")) {
404 struct da9063 *chip = dev_get_drvdata(pdev->dev.parent);
405
406 if (chip->variant_code == PMIC_DA9063_AD)
407 rtc->config = &da9063_ad_regs;
408 }
409
410 rtc->regmap = dev_get_regmap(pdev->dev.parent, NULL);
411 if (!rtc->regmap) {
412 dev_warn(&pdev->dev, "Parent regmap unavailable.\n");
413 return -ENXIO;
414 }
415
416 config = rtc->config;
417 ret = regmap_update_bits(rtc->regmap,
418 config->rtc_enable_reg,
419 config->rtc_enable_mask,
420 config->rtc_enable_mask);
421 if (ret < 0) {
422 dev_err(&pdev->dev, "Failed to enable RTC\n");
423 return ret;
424 }
425
426 ret = regmap_update_bits(rtc->regmap,
427 config->rtc_enable_32k_crystal_reg,
428 config->rtc_crystal_mask,
429 config->rtc_crystal_mask);
430 if (ret < 0) {
431 dev_err(&pdev->dev, "Failed to run 32kHz oscillator\n");
432 return ret;
433 }
434
435 ret = regmap_update_bits(rtc->regmap,
436 config->rtc_alarm_secs_reg,
437 config->rtc_alarm_status_mask,
438 0);
439 if (ret < 0) {
440 dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
441 return ret;
442 }
443
444 ret = regmap_update_bits(rtc->regmap,
445 config->rtc_alarm_secs_reg,
446 DA9063_ALARM_STATUS_ALARM,
447 DA9063_ALARM_STATUS_ALARM);
448 if (ret < 0) {
449 dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
450 return ret;
451 }
452
453 ret = regmap_update_bits(rtc->regmap,
454 config->rtc_alarm_year_reg,
455 config->rtc_tick_on_mask,
456 0);
457 if (ret < 0) {
458 dev_err(&pdev->dev, "Failed to disable TICKs\n");
459 return ret;
460 }
461
462 data[RTC_SEC] = 0;
463 ret = regmap_bulk_read(rtc->regmap,
464 config->rtc_alarm_secs_reg,
465 &data[config->rtc_data_start],
466 config->rtc_alarm_len);
467 if (ret < 0) {
468 dev_err(&pdev->dev, "Failed to read initial alarm data: %d\n",
469 ret);
470 return ret;
471 }
472
473 platform_set_drvdata(pdev, rtc);
474
475 rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, DA9063_DRVNAME_RTC,
476 &da9063_rtc_ops, THIS_MODULE);
477 if (IS_ERR(rtc->rtc_dev))
478 return PTR_ERR(rtc->rtc_dev);
479
480 da9063_data_to_tm(data, &rtc->alarm_time, rtc);
481 rtc->rtc_sync = false;
482
483 irq_alarm = platform_get_irq_byname(pdev, "ALARM");
484 ret = devm_request_threaded_irq(&pdev->dev, irq_alarm, NULL,
485 da9063_alarm_event,
486 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
487 "ALARM", rtc);
488 if (ret)
489 dev_err(&pdev->dev, "Failed to request ALARM IRQ %d: %d\n",
490 irq_alarm, ret);
491
492 return ret;
493}
494
495static struct platform_driver da9063_rtc_driver = {
496 .probe = da9063_rtc_probe,
497 .driver = {
498 .name = DA9063_DRVNAME_RTC,
499 .of_match_table = da9063_compatible_reg_id_table,
500 },
501};
502
503module_platform_driver(da9063_rtc_driver);
504
505MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
506MODULE_DESCRIPTION("Real time clock device driver for Dialog DA9063");
507MODULE_LICENSE("GPL");
508MODULE_ALIAS("platform:" DA9063_DRVNAME_RTC);
509
