Commit | Line | Data |
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1c97872b UKK |
1 | /* |
2 | * Real Time Clock driver for Freescale MC13XXX PMIC | |
3 | * | |
4 | * (C) 2009 Sascha Hauer, Pengutronix | |
5 | * (C) 2009 Uwe Kleine-Koenig, Pengutronix | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/mfd/mc13xxx.h> | |
13 | #include <linux/platform_device.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/rtc.h> | |
18 | ||
19 | #define DRIVER_NAME "mc13xxx-rtc" | |
20 | ||
21 | #define MC13XXX_RTCTOD 20 | |
22 | #define MC13XXX_RTCTODA 21 | |
23 | #define MC13XXX_RTCDAY 22 | |
24 | #define MC13XXX_RTCDAYA 23 | |
25 | ||
6a2b3422 AS |
26 | #define SEC_PER_DAY (24 * 60 * 60) |
27 | ||
1c97872b UKK |
28 | struct mc13xxx_rtc { |
29 | struct rtc_device *rtc; | |
30 | struct mc13xxx *mc13xxx; | |
31 | int valid; | |
32 | }; | |
33 | ||
34 | static int mc13xxx_rtc_irq_enable_unlocked(struct device *dev, | |
35 | unsigned int enabled, int irq) | |
36 | { | |
37 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); | |
38 | int (*func)(struct mc13xxx *mc13xxx, int irq); | |
39 | ||
40 | if (!priv->valid) | |
41 | return -ENODATA; | |
42 | ||
43 | func = enabled ? mc13xxx_irq_unmask : mc13xxx_irq_mask; | |
44 | return func(priv->mc13xxx, irq); | |
45 | } | |
46 | ||
2fb004a9 AS |
47 | static int mc13xxx_rtc_alarm_irq_enable(struct device *dev, |
48 | unsigned int enabled) | |
1c97872b UKK |
49 | { |
50 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); | |
51 | int ret; | |
52 | ||
53 | mc13xxx_lock(priv->mc13xxx); | |
54 | ||
2fb004a9 | 55 | ret = mc13xxx_rtc_irq_enable_unlocked(dev, enabled, MC13XXX_IRQ_TODA); |
1c97872b UKK |
56 | |
57 | mc13xxx_unlock(priv->mc13xxx); | |
58 | ||
59 | return ret; | |
60 | } | |
61 | ||
62 | static int mc13xxx_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
63 | { | |
64 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); | |
65 | unsigned int seconds, days1, days2; | |
1c97872b | 66 | |
12de3621 AS |
67 | if (!priv->valid) |
68 | return -ENODATA; | |
1c97872b | 69 | |
6a2b3422 AS |
70 | do { |
71 | int ret; | |
1c97872b | 72 | |
6a2b3422 AS |
73 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days1); |
74 | if (ret) | |
75 | return ret; | |
1c97872b | 76 | |
6a2b3422 AS |
77 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTOD, &seconds); |
78 | if (ret) | |
79 | return ret; | |
1c97872b | 80 | |
6a2b3422 AS |
81 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days2); |
82 | if (ret) | |
83 | return ret; | |
84 | } while (days1 != days2); | |
1c97872b | 85 | |
6a2b3422 | 86 | rtc_time_to_tm(days1 * SEC_PER_DAY + seconds, tm); |
1c97872b UKK |
87 | |
88 | return rtc_valid_tm(tm); | |
89 | } | |
90 | ||
91 | static int mc13xxx_rtc_set_mmss(struct device *dev, unsigned long secs) | |
92 | { | |
93 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); | |
94 | unsigned int seconds, days; | |
95 | unsigned int alarmseconds; | |
96 | int ret; | |
97 | ||
6a2b3422 AS |
98 | seconds = secs % SEC_PER_DAY; |
99 | days = secs / SEC_PER_DAY; | |
1c97872b UKK |
100 | |
101 | mc13xxx_lock(priv->mc13xxx); | |
102 | ||
103 | /* | |
104 | * temporarily invalidate alarm to prevent triggering it when the day is | |
105 | * already updated while the time isn't yet. | |
106 | */ | |
107 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTODA, &alarmseconds); | |
108 | if (unlikely(ret)) | |
109 | goto out; | |
110 | ||
6a2b3422 | 111 | if (alarmseconds < SEC_PER_DAY) { |
1c97872b UKK |
112 | ret = mc13xxx_reg_write(priv->mc13xxx, |
113 | MC13XXX_RTCTODA, 0x1ffff); | |
114 | if (unlikely(ret)) | |
115 | goto out; | |
116 | } | |
117 | ||
118 | /* | |
119 | * write seconds=0 to prevent a day switch between writing days | |
120 | * and seconds below | |
121 | */ | |
122 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTOD, 0); | |
123 | if (unlikely(ret)) | |
124 | goto out; | |
125 | ||
126 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCDAY, days); | |
127 | if (unlikely(ret)) | |
128 | goto out; | |
129 | ||
130 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTOD, seconds); | |
131 | if (unlikely(ret)) | |
132 | goto out; | |
133 | ||
134 | /* restore alarm */ | |
6a2b3422 | 135 | if (alarmseconds < SEC_PER_DAY) { |
1c97872b UKK |
136 | ret = mc13xxx_reg_write(priv->mc13xxx, |
137 | MC13XXX_RTCTODA, alarmseconds); | |
138 | if (unlikely(ret)) | |
139 | goto out; | |
140 | } | |
141 | ||
12de3621 AS |
142 | if (!priv->valid) { |
143 | ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_RTCRST); | |
144 | if (unlikely(ret)) | |
145 | goto out; | |
146 | ||
147 | ret = mc13xxx_irq_unmask(priv->mc13xxx, MC13XXX_IRQ_RTCRST); | |
148 | } | |
1c97872b | 149 | |
1c97872b UKK |
150 | out: |
151 | priv->valid = !ret; | |
152 | ||
153 | mc13xxx_unlock(priv->mc13xxx); | |
154 | ||
155 | return ret; | |
156 | } | |
157 | ||
158 | static int mc13xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) | |
159 | { | |
160 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); | |
161 | unsigned seconds, days; | |
162 | unsigned long s1970; | |
163 | int enabled, pending; | |
164 | int ret; | |
165 | ||
166 | mc13xxx_lock(priv->mc13xxx); | |
167 | ||
168 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTODA, &seconds); | |
169 | if (unlikely(ret)) | |
170 | goto out; | |
6a2b3422 | 171 | if (seconds >= SEC_PER_DAY) { |
1c97872b UKK |
172 | ret = -ENODATA; |
173 | goto out; | |
174 | } | |
175 | ||
176 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days); | |
177 | if (unlikely(ret)) | |
178 | goto out; | |
179 | ||
180 | ret = mc13xxx_irq_status(priv->mc13xxx, MC13XXX_IRQ_TODA, | |
181 | &enabled, &pending); | |
182 | ||
183 | out: | |
184 | mc13xxx_unlock(priv->mc13xxx); | |
185 | ||
186 | if (ret) | |
187 | return ret; | |
188 | ||
189 | alarm->enabled = enabled; | |
190 | alarm->pending = pending; | |
191 | ||
6a2b3422 | 192 | s1970 = days * SEC_PER_DAY + seconds; |
1c97872b UKK |
193 | |
194 | rtc_time_to_tm(s1970, &alarm->time); | |
195 | dev_dbg(dev, "%s: %lu\n", __func__, s1970); | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | static int mc13xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) | |
201 | { | |
202 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); | |
203 | unsigned long s1970; | |
204 | unsigned seconds, days; | |
205 | int ret; | |
206 | ||
207 | mc13xxx_lock(priv->mc13xxx); | |
208 | ||
209 | /* disable alarm to prevent false triggering */ | |
210 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTODA, 0x1ffff); | |
211 | if (unlikely(ret)) | |
212 | goto out; | |
213 | ||
214 | ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_TODA); | |
215 | if (unlikely(ret)) | |
216 | goto out; | |
217 | ||
218 | ret = rtc_tm_to_time(&alarm->time, &s1970); | |
219 | if (unlikely(ret)) | |
220 | goto out; | |
221 | ||
222 | dev_dbg(dev, "%s: o%2.s %lu\n", __func__, alarm->enabled ? "n" : "ff", | |
223 | s1970); | |
224 | ||
225 | ret = mc13xxx_rtc_irq_enable_unlocked(dev, alarm->enabled, | |
226 | MC13XXX_IRQ_TODA); | |
227 | if (unlikely(ret)) | |
228 | goto out; | |
229 | ||
6a2b3422 AS |
230 | seconds = s1970 % SEC_PER_DAY; |
231 | days = s1970 / SEC_PER_DAY; | |
1c97872b UKK |
232 | |
233 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCDAYA, days); | |
234 | if (unlikely(ret)) | |
235 | goto out; | |
236 | ||
237 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTODA, seconds); | |
238 | ||
239 | out: | |
240 | mc13xxx_unlock(priv->mc13xxx); | |
241 | ||
242 | return ret; | |
243 | } | |
244 | ||
245 | static irqreturn_t mc13xxx_rtc_alarm_handler(int irq, void *dev) | |
246 | { | |
247 | struct mc13xxx_rtc *priv = dev; | |
248 | struct mc13xxx *mc13xxx = priv->mc13xxx; | |
249 | ||
250 | dev_dbg(&priv->rtc->dev, "Alarm\n"); | |
251 | ||
252 | rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_AF); | |
253 | ||
254 | mc13xxx_irq_ack(mc13xxx, irq); | |
255 | ||
256 | return IRQ_HANDLED; | |
257 | } | |
258 | ||
259 | static irqreturn_t mc13xxx_rtc_update_handler(int irq, void *dev) | |
260 | { | |
261 | struct mc13xxx_rtc *priv = dev; | |
262 | struct mc13xxx *mc13xxx = priv->mc13xxx; | |
263 | ||
264 | dev_dbg(&priv->rtc->dev, "1HZ\n"); | |
265 | ||
266 | rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_UF); | |
267 | ||
268 | mc13xxx_irq_ack(mc13xxx, irq); | |
269 | ||
270 | return IRQ_HANDLED; | |
271 | } | |
272 | ||
1c97872b UKK |
273 | static const struct rtc_class_ops mc13xxx_rtc_ops = { |
274 | .read_time = mc13xxx_rtc_read_time, | |
275 | .set_mmss = mc13xxx_rtc_set_mmss, | |
276 | .read_alarm = mc13xxx_rtc_read_alarm, | |
277 | .set_alarm = mc13xxx_rtc_set_alarm, | |
278 | .alarm_irq_enable = mc13xxx_rtc_alarm_irq_enable, | |
1c97872b UKK |
279 | }; |
280 | ||
281 | static irqreturn_t mc13xxx_rtc_reset_handler(int irq, void *dev) | |
282 | { | |
283 | struct mc13xxx_rtc *priv = dev; | |
284 | struct mc13xxx *mc13xxx = priv->mc13xxx; | |
285 | ||
12de3621 | 286 | dev_warn(&priv->rtc->dev, "Contents of the RTC are no longer valid\n"); |
1c97872b UKK |
287 | priv->valid = 0; |
288 | ||
289 | mc13xxx_irq_mask(mc13xxx, irq); | |
290 | ||
291 | return IRQ_HANDLED; | |
292 | } | |
293 | ||
db5cf8d1 | 294 | static int __init mc13xxx_rtc_probe(struct platform_device *pdev) |
1c97872b UKK |
295 | { |
296 | int ret; | |
297 | struct mc13xxx_rtc *priv; | |
298 | struct mc13xxx *mc13xxx; | |
1c97872b | 299 | |
a379fd24 | 300 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
1c97872b UKK |
301 | if (!priv) |
302 | return -ENOMEM; | |
303 | ||
304 | mc13xxx = dev_get_drvdata(pdev->dev.parent); | |
305 | priv->mc13xxx = mc13xxx; | |
12de3621 | 306 | priv->valid = 1; |
1c97872b UKK |
307 | |
308 | platform_set_drvdata(pdev, priv); | |
309 | ||
589e5014 AS |
310 | priv->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, |
311 | &mc13xxx_rtc_ops, THIS_MODULE); | |
312 | if (IS_ERR(priv->rtc)) | |
313 | return PTR_ERR(priv->rtc); | |
314 | ||
1c97872b UKK |
315 | mc13xxx_lock(mc13xxx); |
316 | ||
12de3621 AS |
317 | mc13xxx_irq_ack(mc13xxx, MC13XXX_IRQ_RTCRST); |
318 | ||
1c97872b UKK |
319 | ret = mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_RTCRST, |
320 | mc13xxx_rtc_reset_handler, DRIVER_NAME, priv); | |
321 | if (ret) | |
322 | goto err_reset_irq_request; | |
323 | ||
fb1bd9a2 | 324 | ret = mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_1HZ, |
1c97872b UKK |
325 | mc13xxx_rtc_update_handler, DRIVER_NAME, priv); |
326 | if (ret) | |
589e5014 | 327 | goto err_reset_irq_status; |
1c97872b UKK |
328 | |
329 | ret = mc13xxx_irq_request_nounmask(mc13xxx, MC13XXX_IRQ_TODA, | |
330 | mc13xxx_rtc_alarm_handler, DRIVER_NAME, priv); | |
589e5014 AS |
331 | if (!ret) |
332 | goto err_reset_irq_request; | |
1c97872b | 333 | |
589e5014 | 334 | mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_1HZ, priv); |
1c97872b UKK |
335 | |
336 | err_reset_irq_status: | |
589e5014 | 337 | mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_RTCRST, priv); |
1c97872b | 338 | |
1c97872b | 339 | err_reset_irq_request: |
589e5014 | 340 | mc13xxx_unlock(mc13xxx); |
1c97872b | 341 | |
1c97872b UKK |
342 | return ret; |
343 | } | |
344 | ||
77bf2ea8 | 345 | static int mc13xxx_rtc_remove(struct platform_device *pdev) |
1c97872b UKK |
346 | { |
347 | struct mc13xxx_rtc *priv = platform_get_drvdata(pdev); | |
348 | ||
349 | mc13xxx_lock(priv->mc13xxx); | |
350 | ||
1c97872b UKK |
351 | mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TODA, priv); |
352 | mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_1HZ, priv); | |
353 | mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_RTCRST, priv); | |
354 | ||
355 | mc13xxx_unlock(priv->mc13xxx); | |
356 | ||
1c97872b UKK |
357 | return 0; |
358 | } | |
359 | ||
a46481d7 | 360 | static const struct platform_device_id mc13xxx_rtc_idtable[] = { |
1c97872b UKK |
361 | { |
362 | .name = "mc13783-rtc", | |
363 | }, { | |
364 | .name = "mc13892-rtc", | |
19a1ac50 UKK |
365 | }, { |
366 | .name = "mc34708-rtc", | |
1c97872b | 367 | }, |
0f636fc1 | 368 | { /* sentinel */ } |
1c97872b | 369 | }; |
0f636fc1 | 370 | MODULE_DEVICE_TABLE(platform, mc13xxx_rtc_idtable); |
1c97872b UKK |
371 | |
372 | static struct platform_driver mc13xxx_rtc_driver = { | |
373 | .id_table = mc13xxx_rtc_idtable, | |
77bf2ea8 | 374 | .remove = mc13xxx_rtc_remove, |
1c97872b UKK |
375 | .driver = { |
376 | .name = DRIVER_NAME, | |
377 | .owner = THIS_MODULE, | |
378 | }, | |
379 | }; | |
380 | ||
09fb7ad1 | 381 | module_platform_driver_probe(mc13xxx_rtc_driver, &mc13xxx_rtc_probe); |
1c97872b UKK |
382 | |
383 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); | |
384 | MODULE_DESCRIPTION("RTC driver for Freescale MC13XXX PMIC"); | |
385 | MODULE_LICENSE("GPL v2"); |