1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
|
/*
* Copyright (c) 2014-2015 MediaTek Inc.
* Author: Tianping.Fang <tianping.fang@mediatek.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
#include <linux/irqdomain.h>
#include <linux/platform_device.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/io.h>
#include <linux/mfd/mt6397/core.h>
#define RTC_BBPU 0x0000
#define RTC_BBPU_CBUSY BIT(6)
#define RTC_WRTGR 0x003c
#define RTC_IRQ_STA 0x0002
#define RTC_IRQ_STA_AL BIT(0)
#define RTC_IRQ_STA_LP BIT(3)
#define RTC_IRQ_EN 0x0004
#define RTC_IRQ_EN_AL BIT(0)
#define RTC_IRQ_EN_ONESHOT BIT(2)
#define RTC_IRQ_EN_LP BIT(3)
#define RTC_IRQ_EN_ONESHOT_AL (RTC_IRQ_EN_ONESHOT | RTC_IRQ_EN_AL)
#define RTC_AL_MASK 0x0008
#define RTC_AL_MASK_DOW BIT(4)
#define RTC_TC_SEC 0x000a
/* Min, Hour, Dom... register offset to RTC_TC_SEC */
#define RTC_OFFSET_SEC 0
#define RTC_OFFSET_MIN 1
#define RTC_OFFSET_HOUR 2
#define RTC_OFFSET_DOM 3
#define RTC_OFFSET_DOW 4
#define RTC_OFFSET_MTH 5
#define RTC_OFFSET_YEAR 6
#define RTC_OFFSET_COUNT 7
#define RTC_AL_SEC 0x0018
#define RTC_PDN2 0x002e
#define RTC_PDN2_PWRON_ALARM BIT(4)
#define RTC_MIN_YEAR 1968
#define RTC_BASE_YEAR 1900
#define RTC_NUM_YEARS 128
#define RTC_MIN_YEAR_OFFSET (RTC_MIN_YEAR - RTC_BASE_YEAR)
struct mt6397_rtc {
struct device *dev;
struct rtc_device *rtc_dev;
struct mutex lock;
struct regmap *regmap;
int irq;
u32 addr_base;
};
static int mtk_rtc_write_trigger(struct mt6397_rtc *rtc)
{
unsigned long timeout = jiffies + HZ;
int ret;
u32 data;
ret = regmap_write(rtc->regmap, rtc->addr_base + RTC_WRTGR, 1);
if (ret < 0)
return ret;
while (1) {
ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_BBPU,
&data);
if (ret < 0)
break;
if (!(data & RTC_BBPU_CBUSY))
break;
if (time_after(jiffies, timeout)) {
ret = -ETIMEDOUT;
break;
}
cpu_relax();
}
return ret;
}
static irqreturn_t mtk_rtc_irq_handler_thread(int irq, void *data)
{
struct mt6397_rtc *rtc = data;
u32 irqsta, irqen;
int ret;
ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_IRQ_STA, &irqsta);
if ((ret >= 0) && (irqsta & RTC_IRQ_STA_AL)) {
rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);
irqen = irqsta & ~RTC_IRQ_EN_AL;
mutex_lock(&rtc->lock);
if (regmap_write(rtc->regmap, rtc->addr_base + RTC_IRQ_EN,
irqen) < 0)
mtk_rtc_write_trigger(rtc);
mutex_unlock(&rtc->lock);
return IRQ_HANDLED;
}
return IRQ_NONE;
}
static int __mtk_rtc_read_time(struct mt6397_rtc *rtc,
struct rtc_time *tm, int *sec)
{
int ret;
u16 data[RTC_OFFSET_COUNT];
mutex_lock(&rtc->lock);
ret = regmap_bulk_read(rtc->regmap, rtc->addr_base + RTC_TC_SEC,
data, RTC_OFFSET_COUNT);
if (ret < 0)
goto exit;
tm->tm_sec = data[RTC_OFFSET_SEC];
tm->tm_min = data[RTC_OFFSET_MIN];
tm->tm_hour = data[RTC_OFFSET_HOUR];
tm->tm_mday = data[RTC_OFFSET_DOM];
tm->tm_mon = data[RTC_OFFSET_MTH];
tm->tm_year = data[RTC_OFFSET_YEAR];
ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_TC_SEC, sec);
exit:
mutex_unlock(&rtc->lock);
return ret;
}
static int mtk_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
time64_t time;
struct mt6397_rtc *rtc = dev_get_drvdata(dev);
int days, sec, ret;
do {
ret = __mtk_rtc_read_time(rtc, tm, &sec);
if (ret < 0)
goto exit;
} while (sec < tm->tm_sec);
/* HW register use 7 bits to store year data, minus
* RTC_MIN_YEAR_OFFSET before write year data to register, and plus
* RTC_MIN_YEAR_OFFSET back after read year from register
*/
tm->tm_year += RTC_MIN_YEAR_OFFSET;
/* HW register start mon from one, but tm_mon start from zero. */
tm->tm_mon--;
time = rtc_tm_to_time64(tm);
/* rtc_tm_to_time64 covert Gregorian date to seconds since
* 01-01-1970 00:00:00, and this date is Thursday.
*/
days = div_s64(time, 86400);
tm->tm_wday = (days + 4) % 7;
exit:
return ret;
}
static int mtk_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct mt6397_rtc *rtc = dev_get_drvdata(dev);
int ret;
u16 data[RTC_OFFSET_COUNT];
tm->tm_year -= RTC_MIN_YEAR_OFFSET;
tm->tm_mon++;
data[RTC_OFFSET_SEC] = tm->tm_sec;
data[RTC_OFFSET_MIN] = tm->tm_min;
data[RTC_OFFSET_HOUR] = tm->tm_hour;
data[RTC_OFFSET_DOM] = tm->tm_mday;
data[RTC_OFFSET_MTH] = tm->tm_mon;
data[RTC_OFFSET_YEAR] = tm->tm_year;
mutex_lock(&rtc->lock);
ret = regmap_bulk_write(rtc->regmap, rtc->addr_base + RTC_TC_SEC,
data, RTC_OFFSET_COUNT);
if (ret < 0)
goto exit;
/* Time register write to hardware after call trigger function */
ret = mtk_rtc_write_trigger(rtc);
exit:
mutex_unlock(&rtc->lock);
return ret;
}
static int mtk_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
struct rtc_time *tm = &alm->time;
struct mt6397_rtc *rtc = dev_get_drvdata(dev);
u32 irqen, pdn2;
int ret;
u16 data[RTC_OFFSET_COUNT];
mutex_lock(&rtc->lock);
ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_IRQ_EN, &irqen);
if (ret < 0)
goto err_exit;
ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_PDN2, &pdn2);
if (ret < 0)
goto err_exit;
ret = regmap_bulk_read(rtc->regmap, rtc->addr_base + RTC_AL_SEC,
data, RTC_OFFSET_COUNT);
if (ret < 0)
goto err_exit;
alm->enabled = !!(irqen & RTC_IRQ_EN_AL);
alm->pending = !!(pdn2 & RTC_PDN2_PWRON_ALARM);
mutex_unlock(&rtc->lock);
tm->tm_sec = data[RTC_OFFSET_SEC];
tm->tm_min = data[RTC_OFFSET_MIN];
tm->tm_hour = data[RTC_OFFSET_HOUR];
tm->tm_mday = data[RTC_OFFSET_DOM];
tm->tm_mon = data[RTC_OFFSET_MTH];
tm->tm_year = data[RTC_OFFSET_YEAR];
tm->tm_year += RTC_MIN_YEAR_OFFSET;
tm->tm_mon--;
return 0;
err_exit:
mutex_unlock(&rtc->lock);
return ret;
}
static int mtk_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
struct rtc_time *tm = &alm->time;
struct mt6397_rtc *rtc = dev_get_drvdata(dev);
int ret;
u16 data[RTC_OFFSET_COUNT];
tm->tm_year -= RTC_MIN_YEAR_OFFSET;
tm->tm_mon++;
data[RTC_OFFSET_SEC] = tm->tm_sec;
data[RTC_OFFSET_MIN] = tm->tm_min;
data[RTC_OFFSET_HOUR] = tm->tm_hour;
data[RTC_OFFSET_DOM] = tm->tm_mday;
data[RTC_OFFSET_MTH] = tm->tm_mon;
data[RTC_OFFSET_YEAR] = tm->tm_year;
mutex_lock(&rtc->lock);
if (alm->enabled) {
ret = regmap_bulk_write(rtc->regmap,
rtc->addr_base +
|