Commit | Line | Data |
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594c6fb9 CC |
1 | /* |
2 | * An RTC driver for Allwinner A10/A20 | |
3 | * | |
4 | * Copyright (c) 2013, Carlo Caione <carlo.caione@gmail.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
19 | */ | |
20 | ||
21 | #include <linux/delay.h> | |
22 | #include <linux/err.h> | |
23 | #include <linux/fs.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/io.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/of.h> | |
30 | #include <linux/of_address.h> | |
31 | #include <linux/of_device.h> | |
32 | #include <linux/platform_device.h> | |
33 | #include <linux/rtc.h> | |
34 | #include <linux/types.h> | |
35 | ||
36 | #define SUNXI_LOSC_CTRL 0x0000 | |
37 | #define SUNXI_LOSC_CTRL_RTC_HMS_ACC BIT(8) | |
38 | #define SUNXI_LOSC_CTRL_RTC_YMD_ACC BIT(7) | |
39 | ||
40 | #define SUNXI_RTC_YMD 0x0004 | |
41 | ||
42 | #define SUNXI_RTC_HMS 0x0008 | |
43 | ||
44 | #define SUNXI_ALRM_DHMS 0x000c | |
45 | ||
46 | #define SUNXI_ALRM_EN 0x0014 | |
47 | #define SUNXI_ALRM_EN_CNT_EN BIT(8) | |
48 | ||
49 | #define SUNXI_ALRM_IRQ_EN 0x0018 | |
50 | #define SUNXI_ALRM_IRQ_EN_CNT_IRQ_EN BIT(0) | |
51 | ||
52 | #define SUNXI_ALRM_IRQ_STA 0x001c | |
53 | #define SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND BIT(0) | |
54 | ||
55 | #define SUNXI_MASK_DH 0x0000001f | |
56 | #define SUNXI_MASK_SM 0x0000003f | |
57 | #define SUNXI_MASK_M 0x0000000f | |
58 | #define SUNXI_MASK_LY 0x00000001 | |
59 | #define SUNXI_MASK_D 0x00000ffe | |
60 | #define SUNXI_MASK_M 0x0000000f | |
61 | ||
62 | #define SUNXI_GET(x, mask, shift) (((x) & ((mask) << (shift))) \ | |
63 | >> (shift)) | |
64 | ||
65 | #define SUNXI_SET(x, mask, shift) (((x) & (mask)) << (shift)) | |
66 | ||
67 | /* | |
68 | * Get date values | |
69 | */ | |
70 | #define SUNXI_DATE_GET_DAY_VALUE(x) SUNXI_GET(x, SUNXI_MASK_DH, 0) | |
71 | #define SUNXI_DATE_GET_MON_VALUE(x) SUNXI_GET(x, SUNXI_MASK_M, 8) | |
72 | #define SUNXI_DATE_GET_YEAR_VALUE(x, mask) SUNXI_GET(x, mask, 16) | |
73 | ||
74 | /* | |
75 | * Get time values | |
76 | */ | |
77 | #define SUNXI_TIME_GET_SEC_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 0) | |
78 | #define SUNXI_TIME_GET_MIN_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 8) | |
79 | #define SUNXI_TIME_GET_HOUR_VALUE(x) SUNXI_GET(x, SUNXI_MASK_DH, 16) | |
80 | ||
81 | /* | |
82 | * Get alarm values | |
83 | */ | |
84 | #define SUNXI_ALRM_GET_SEC_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 0) | |
85 | #define SUNXI_ALRM_GET_MIN_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 8) | |
86 | #define SUNXI_ALRM_GET_HOUR_VALUE(x) SUNXI_GET(x, SUNXI_MASK_DH, 16) | |
87 | ||
88 | /* | |
89 | * Set date values | |
90 | */ | |
91 | #define SUNXI_DATE_SET_DAY_VALUE(x) SUNXI_DATE_GET_DAY_VALUE(x) | |
92 | #define SUNXI_DATE_SET_MON_VALUE(x) SUNXI_SET(x, SUNXI_MASK_M, 8) | |
93 | #define SUNXI_DATE_SET_YEAR_VALUE(x, mask) SUNXI_SET(x, mask, 16) | |
94 | #define SUNXI_LEAP_SET_VALUE(x, shift) SUNXI_SET(x, SUNXI_MASK_LY, shift) | |
95 | ||
96 | /* | |
97 | * Set time values | |
98 | */ | |
99 | #define SUNXI_TIME_SET_SEC_VALUE(x) SUNXI_TIME_GET_SEC_VALUE(x) | |
100 | #define SUNXI_TIME_SET_MIN_VALUE(x) SUNXI_SET(x, SUNXI_MASK_SM, 8) | |
101 | #define SUNXI_TIME_SET_HOUR_VALUE(x) SUNXI_SET(x, SUNXI_MASK_DH, 16) | |
102 | ||
103 | /* | |
104 | * Set alarm values | |
105 | */ | |
106 | #define SUNXI_ALRM_SET_SEC_VALUE(x) SUNXI_ALRM_GET_SEC_VALUE(x) | |
107 | #define SUNXI_ALRM_SET_MIN_VALUE(x) SUNXI_SET(x, SUNXI_MASK_SM, 8) | |
108 | #define SUNXI_ALRM_SET_HOUR_VALUE(x) SUNXI_SET(x, SUNXI_MASK_DH, 16) | |
109 | #define SUNXI_ALRM_SET_DAY_VALUE(x) SUNXI_SET(x, SUNXI_MASK_D, 21) | |
110 | ||
111 | /* | |
112 | * Time unit conversions | |
113 | */ | |
114 | #define SEC_IN_MIN 60 | |
115 | #define SEC_IN_HOUR (60 * SEC_IN_MIN) | |
116 | #define SEC_IN_DAY (24 * SEC_IN_HOUR) | |
117 | ||
118 | /* | |
119 | * The year parameter passed to the driver is usually an offset relative to | |
120 | * the year 1900. This macro is used to convert this offset to another one | |
121 | * relative to the minimum year allowed by the hardware. | |
122 | */ | |
123 | #define SUNXI_YEAR_OFF(x) ((x)->min - 1900) | |
124 | ||
125 | /* | |
126 | * min and max year are arbitrary set considering the limited range of the | |
127 | * hardware register field | |
128 | */ | |
129 | struct sunxi_rtc_data_year { | |
130 | unsigned int min; /* min year allowed */ | |
131 | unsigned int max; /* max year allowed */ | |
132 | unsigned int mask; /* mask for the year field */ | |
133 | unsigned char leap_shift; /* bit shift to get the leap year */ | |
134 | }; | |
135 | ||
136 | static struct sunxi_rtc_data_year data_year_param[] = { | |
137 | [0] = { | |
138 | .min = 2010, | |
139 | .max = 2073, | |
140 | .mask = 0x3f, | |
141 | .leap_shift = 22, | |
142 | }, | |
143 | [1] = { | |
144 | .min = 1970, | |
145 | .max = 2225, | |
146 | .mask = 0xff, | |
147 | .leap_shift = 24, | |
148 | }, | |
149 | }; | |
150 | ||
151 | struct sunxi_rtc_dev { | |
152 | struct rtc_device *rtc; | |
153 | struct device *dev; | |
154 | struct sunxi_rtc_data_year *data_year; | |
155 | void __iomem *base; | |
156 | int irq; | |
157 | }; | |
158 | ||
159 | static irqreturn_t sunxi_rtc_alarmirq(int irq, void *id) | |
160 | { | |
161 | struct sunxi_rtc_dev *chip = (struct sunxi_rtc_dev *) id; | |
162 | u32 val; | |
163 | ||
164 | val = readl(chip->base + SUNXI_ALRM_IRQ_STA); | |
165 | ||
166 | if (val & SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND) { | |
167 | val |= SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND; | |
168 | writel(val, chip->base + SUNXI_ALRM_IRQ_STA); | |
169 | ||
170 | rtc_update_irq(chip->rtc, 1, RTC_AF | RTC_IRQF); | |
171 | ||
172 | return IRQ_HANDLED; | |
173 | } | |
174 | ||
175 | return IRQ_NONE; | |
176 | } | |
177 | ||
178 | static void sunxi_rtc_setaie(int to, struct sunxi_rtc_dev *chip) | |
179 | { | |
180 | u32 alrm_val = 0; | |
181 | u32 alrm_irq_val = 0; | |
182 | ||
183 | if (to) { | |
184 | alrm_val = readl(chip->base + SUNXI_ALRM_EN); | |
185 | alrm_val |= SUNXI_ALRM_EN_CNT_EN; | |
186 | ||
187 | alrm_irq_val = readl(chip->base + SUNXI_ALRM_IRQ_EN); | |
188 | alrm_irq_val |= SUNXI_ALRM_IRQ_EN_CNT_IRQ_EN; | |
189 | } else { | |
190 | writel(SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND, | |
191 | chip->base + SUNXI_ALRM_IRQ_STA); | |
192 | } | |
193 | ||
194 | writel(alrm_val, chip->base + SUNXI_ALRM_EN); | |
195 | writel(alrm_irq_val, chip->base + SUNXI_ALRM_IRQ_EN); | |
196 | } | |
197 | ||
198 | static int sunxi_rtc_getalarm(struct device *dev, struct rtc_wkalrm *wkalrm) | |
199 | { | |
200 | struct sunxi_rtc_dev *chip = dev_get_drvdata(dev); | |
201 | struct rtc_time *alrm_tm = &wkalrm->time; | |
202 | u32 alrm; | |
203 | u32 alrm_en; | |
204 | u32 date; | |
205 | ||
206 | alrm = readl(chip->base + SUNXI_ALRM_DHMS); | |
207 | date = readl(chip->base + SUNXI_RTC_YMD); | |
208 | ||
209 | alrm_tm->tm_sec = SUNXI_ALRM_GET_SEC_VALUE(alrm); | |
210 | alrm_tm->tm_min = SUNXI_ALRM_GET_MIN_VALUE(alrm); | |
211 | alrm_tm->tm_hour = SUNXI_ALRM_GET_HOUR_VALUE(alrm); | |
212 | ||
213 | alrm_tm->tm_mday = SUNXI_DATE_GET_DAY_VALUE(date); | |
214 | alrm_tm->tm_mon = SUNXI_DATE_GET_MON_VALUE(date); | |
215 | alrm_tm->tm_year = SUNXI_DATE_GET_YEAR_VALUE(date, | |
216 | chip->data_year->mask); | |
217 | ||
218 | alrm_tm->tm_mon -= 1; | |
219 | ||
220 | /* | |
221 | * switch from (data_year->min)-relative offset to | |
222 | * a (1900)-relative one | |
223 | */ | |
224 | alrm_tm->tm_year += SUNXI_YEAR_OFF(chip->data_year); | |
225 | ||
226 | alrm_en = readl(chip->base + SUNXI_ALRM_IRQ_EN); | |
227 | if (alrm_en & SUNXI_ALRM_EN_CNT_EN) | |
228 | wkalrm->enabled = 1; | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
233 | static int sunxi_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm) | |
234 | { | |
235 | struct sunxi_rtc_dev *chip = dev_get_drvdata(dev); | |
236 | u32 date, time; | |
237 | ||
238 | /* | |
239 | * read again in case it changes | |
240 | */ | |
241 | do { | |
242 | date = readl(chip->base + SUNXI_RTC_YMD); | |
243 | time = readl(chip->base + SUNXI_RTC_HMS); | |
244 | } while ((date != readl(chip->base + SUNXI_RTC_YMD)) || | |
245 | (time != readl(chip->base + SUNXI_RTC_HMS))); | |
246 | ||
247 | rtc_tm->tm_sec = SUNXI_TIME_GET_SEC_VALUE(time); | |
248 | rtc_tm->tm_min = SUNXI_TIME_GET_MIN_VALUE(time); | |
249 | rtc_tm->tm_hour = SUNXI_TIME_GET_HOUR_VALUE(time); | |
250 | ||
251 | rtc_tm->tm_mday = SUNXI_DATE_GET_DAY_VALUE(date); | |
252 | rtc_tm->tm_mon = SUNXI_DATE_GET_MON_VALUE(date); | |
253 | rtc_tm->tm_year = SUNXI_DATE_GET_YEAR_VALUE(date, | |
254 | chip->data_year->mask); | |
255 | ||
256 | rtc_tm->tm_mon -= 1; | |
257 | ||
258 | /* | |
259 | * switch from (data_year->min)-relative offset to | |
260 | * a (1900)-relative one | |
261 | */ | |
262 | rtc_tm->tm_year += SUNXI_YEAR_OFF(chip->data_year); | |
263 | ||
264 | return rtc_valid_tm(rtc_tm); | |
265 | } | |
266 | ||
267 | static int sunxi_rtc_setalarm(struct device *dev, struct rtc_wkalrm *wkalrm) | |
268 | { | |
269 | struct sunxi_rtc_dev *chip = dev_get_drvdata(dev); | |
270 | struct rtc_time *alrm_tm = &wkalrm->time; | |
271 | struct rtc_time tm_now; | |
272 | u32 alrm = 0; | |
273 | unsigned long time_now = 0; | |
274 | unsigned long time_set = 0; | |
275 | unsigned long time_gap = 0; | |
276 | unsigned long time_gap_day = 0; | |
277 | unsigned long time_gap_hour = 0; | |
278 | unsigned long time_gap_min = 0; | |
279 | int ret = 0; | |
280 | ||
281 | ret = sunxi_rtc_gettime(dev, &tm_now); | |
282 | if (ret < 0) { | |
283 | dev_err(dev, "Error in getting time\n"); | |
284 | return -EINVAL; | |
285 | } | |
286 | ||
287 | rtc_tm_to_time(alrm_tm, &time_set); | |
288 | rtc_tm_to_time(&tm_now, &time_now); | |
289 | if (time_set <= time_now) { | |
290 | dev_err(dev, "Date to set in the past\n"); | |
291 | return -EINVAL; | |
292 | } | |
293 | ||
294 | time_gap = time_set - time_now; | |
295 | time_gap_day = time_gap / SEC_IN_DAY; | |
296 | time_gap -= time_gap_day * SEC_IN_DAY; | |
297 | time_gap_hour = time_gap / SEC_IN_HOUR; | |
298 | time_gap -= time_gap_hour * SEC_IN_HOUR; | |
299 | time_gap_min = time_gap / SEC_IN_MIN; | |
300 | time_gap -= time_gap_min * SEC_IN_MIN; | |
301 | ||
302 | if (time_gap_day > 255) { | |
303 | dev_err(dev, "Day must be in the range 0 - 255\n"); | |
304 | return -EINVAL; | |
305 | } | |
306 | ||
307 | sunxi_rtc_setaie(0, chip); | |
308 | writel(0, chip->base + SUNXI_ALRM_DHMS); | |
309 | usleep_range(100, 300); | |
310 | ||
311 | alrm = SUNXI_ALRM_SET_SEC_VALUE(time_gap) | | |
312 | SUNXI_ALRM_SET_MIN_VALUE(time_gap_min) | | |
313 | SUNXI_ALRM_SET_HOUR_VALUE(time_gap_hour) | | |
314 | SUNXI_ALRM_SET_DAY_VALUE(time_gap_day); | |
315 | writel(alrm, chip->base + SUNXI_ALRM_DHMS); | |
316 | ||
317 | writel(0, chip->base + SUNXI_ALRM_IRQ_EN); | |
318 | writel(SUNXI_ALRM_IRQ_EN_CNT_IRQ_EN, chip->base + SUNXI_ALRM_IRQ_EN); | |
319 | ||
320 | sunxi_rtc_setaie(wkalrm->enabled, chip); | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
325 | static int sunxi_rtc_wait(struct sunxi_rtc_dev *chip, int offset, | |
326 | unsigned int mask, unsigned int ms_timeout) | |
327 | { | |
328 | const unsigned long timeout = jiffies + msecs_to_jiffies(ms_timeout); | |
329 | u32 reg; | |
330 | ||
331 | do { | |
332 | reg = readl(chip->base + offset); | |
333 | reg &= mask; | |
334 | ||
335 | if (reg == mask) | |
336 | return 0; | |
337 | ||
338 | } while (time_before(jiffies, timeout)); | |
339 | ||
340 | return -ETIMEDOUT; | |
341 | } | |
342 | ||
343 | static int sunxi_rtc_settime(struct device *dev, struct rtc_time *rtc_tm) | |
344 | { | |
345 | struct sunxi_rtc_dev *chip = dev_get_drvdata(dev); | |
346 | u32 date = 0; | |
347 | u32 time = 0; | |
348 | int year; | |
349 | ||
350 | /* | |
351 | * the input rtc_tm->tm_year is the offset relative to 1900. We use | |
352 | * the SUNXI_YEAR_OFF macro to rebase it with respect to the min year | |
353 | * allowed by the hardware | |
354 | */ | |
355 | ||
356 | year = rtc_tm->tm_year + 1900; | |
357 | if (year < chip->data_year->min || year > chip->data_year->max) { | |
358 | dev_err(dev, "rtc only supports year in range %d - %d\n", | |
359 | chip->data_year->min, chip->data_year->max); | |
360 | return -EINVAL; | |
361 | } | |
362 | ||
363 | rtc_tm->tm_year -= SUNXI_YEAR_OFF(chip->data_year); | |
364 | rtc_tm->tm_mon += 1; | |
365 | ||
366 | date = SUNXI_DATE_SET_DAY_VALUE(rtc_tm->tm_mday) | | |
367 | SUNXI_DATE_SET_MON_VALUE(rtc_tm->tm_mon) | | |
368 | SUNXI_DATE_SET_YEAR_VALUE(rtc_tm->tm_year, | |
369 | chip->data_year->mask); | |
370 | ||
371 | if (is_leap_year(year)) | |
372 | date |= SUNXI_LEAP_SET_VALUE(1, chip->data_year->leap_shift); | |
373 | ||
374 | time = SUNXI_TIME_SET_SEC_VALUE(rtc_tm->tm_sec) | | |
375 | SUNXI_TIME_SET_MIN_VALUE(rtc_tm->tm_min) | | |
376 | SUNXI_TIME_SET_HOUR_VALUE(rtc_tm->tm_hour); | |
377 | ||
378 | writel(0, chip->base + SUNXI_RTC_HMS); | |
379 | writel(0, chip->base + SUNXI_RTC_YMD); | |
380 | ||
381 | writel(time, chip->base + SUNXI_RTC_HMS); | |
382 | ||
383 | /* | |
384 | * After writing the RTC HH-MM-SS register, the | |
385 | * SUNXI_LOSC_CTRL_RTC_HMS_ACC bit is set and it will not | |
386 | * be cleared until the real writing operation is finished | |
387 | */ | |
388 | ||
389 | if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL, | |
390 | SUNXI_LOSC_CTRL_RTC_HMS_ACC, 50)) { | |
391 | dev_err(dev, "Failed to set rtc time.\n"); | |
392 | return -1; | |
393 | } | |
394 | ||
395 | writel(date, chip->base + SUNXI_RTC_YMD); | |
396 | ||
397 | /* | |
398 | * After writing the RTC YY-MM-DD register, the | |
399 | * SUNXI_LOSC_CTRL_RTC_YMD_ACC bit is set and it will not | |
400 | * be cleared until the real writing operation is finished | |
401 | */ | |
402 | ||
403 | if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL, | |
404 | SUNXI_LOSC_CTRL_RTC_YMD_ACC, 50)) { | |
405 | dev_err(dev, "Failed to set rtc time.\n"); | |
406 | return -1; | |
407 | } | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
412 | static int sunxi_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
413 | { | |
414 | struct sunxi_rtc_dev *chip = dev_get_drvdata(dev); | |
415 | ||
416 | if (!enabled) | |
417 | sunxi_rtc_setaie(enabled, chip); | |
418 | ||
419 | return 0; | |
420 | } | |
421 | ||
422 | static const struct rtc_class_ops sunxi_rtc_ops = { | |
423 | .read_time = sunxi_rtc_gettime, | |
424 | .set_time = sunxi_rtc_settime, | |
425 | .read_alarm = sunxi_rtc_getalarm, | |
426 | .set_alarm = sunxi_rtc_setalarm, | |
427 | .alarm_irq_enable = sunxi_rtc_alarm_irq_enable | |
428 | }; | |
429 | ||
430 | static const struct of_device_id sunxi_rtc_dt_ids[] = { | |
f49bd06e | 431 | { .compatible = "allwinner,sun4i-a10-rtc", .data = &data_year_param[0] }, |
594c6fb9 CC |
432 | { .compatible = "allwinner,sun7i-a20-rtc", .data = &data_year_param[1] }, |
433 | { /* sentinel */ }, | |
434 | }; | |
435 | MODULE_DEVICE_TABLE(of, sunxi_rtc_dt_ids); | |
436 | ||
437 | static int sunxi_rtc_probe(struct platform_device *pdev) | |
438 | { | |
439 | struct sunxi_rtc_dev *chip; | |
440 | struct resource *res; | |
441 | const struct of_device_id *of_id; | |
442 | int ret; | |
443 | ||
444 | chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); | |
445 | if (!chip) | |
446 | return -ENOMEM; | |
447 | ||
448 | platform_set_drvdata(pdev, chip); | |
449 | chip->dev = &pdev->dev; | |
450 | ||
451 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
452 | chip->base = devm_ioremap_resource(&pdev->dev, res); | |
453 | if (IS_ERR(chip->base)) | |
454 | return PTR_ERR(chip->base); | |
455 | ||
456 | chip->irq = platform_get_irq(pdev, 0); | |
457 | if (chip->irq < 0) { | |
458 | dev_err(&pdev->dev, "No IRQ resource\n"); | |
459 | return chip->irq; | |
460 | } | |
461 | ret = devm_request_irq(&pdev->dev, chip->irq, sunxi_rtc_alarmirq, | |
462 | 0, dev_name(&pdev->dev), chip); | |
463 | if (ret) { | |
464 | dev_err(&pdev->dev, "Could not request IRQ\n"); | |
465 | return ret; | |
466 | } | |
467 | ||
468 | of_id = of_match_device(sunxi_rtc_dt_ids, &pdev->dev); | |
469 | if (!of_id) { | |
470 | dev_err(&pdev->dev, "Unable to setup RTC data\n"); | |
471 | return -ENODEV; | |
472 | } | |
473 | chip->data_year = (struct sunxi_rtc_data_year *) of_id->data; | |
474 | ||
475 | /* clear the alarm count value */ | |
476 | writel(0, chip->base + SUNXI_ALRM_DHMS); | |
477 | ||
478 | /* disable alarm, not generate irq pending */ | |
479 | writel(0, chip->base + SUNXI_ALRM_EN); | |
480 | ||
481 | /* disable alarm week/cnt irq, unset to cpu */ | |
482 | writel(0, chip->base + SUNXI_ALRM_IRQ_EN); | |
483 | ||
484 | /* clear alarm week/cnt irq pending */ | |
485 | writel(SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND, chip->base + | |
486 | SUNXI_ALRM_IRQ_STA); | |
487 | ||
488 | chip->rtc = rtc_device_register("rtc-sunxi", &pdev->dev, | |
489 | &sunxi_rtc_ops, THIS_MODULE); | |
490 | if (IS_ERR(chip->rtc)) { | |
491 | dev_err(&pdev->dev, "unable to register device\n"); | |
492 | return PTR_ERR(chip->rtc); | |
493 | } | |
494 | ||
495 | dev_info(&pdev->dev, "RTC enabled\n"); | |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
500 | static int sunxi_rtc_remove(struct platform_device *pdev) | |
501 | { | |
502 | struct sunxi_rtc_dev *chip = platform_get_drvdata(pdev); | |
503 | ||
504 | rtc_device_unregister(chip->rtc); | |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
509 | static struct platform_driver sunxi_rtc_driver = { | |
510 | .probe = sunxi_rtc_probe, | |
511 | .remove = sunxi_rtc_remove, | |
512 | .driver = { | |
513 | .name = "sunxi-rtc", | |
514 | .owner = THIS_MODULE, | |
515 | .of_match_table = sunxi_rtc_dt_ids, | |
516 | }, | |
517 | }; | |
518 | ||
519 | module_platform_driver(sunxi_rtc_driver); | |
520 | ||
521 | MODULE_DESCRIPTION("sunxi RTC driver"); | |
522 | MODULE_AUTHOR("Carlo Caione <carlo.caione@gmail.com>"); | |
523 | MODULE_LICENSE("GPL"); |