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 | |
0307b0d7 | 86 | rtc_time64_to_tm((time64_t)days1 * SEC_PER_DAY + seconds, tm); |
1c97872b UKK |
87 | |
88 | return rtc_valid_tm(tm); | |
89 | } | |
90 | ||
0307b0d7 | 91 | static int mc13xxx_rtc_set_mmss(struct device *dev, time64_t secs) |
1c97872b UKK |
92 | { |
93 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); | |
94 | unsigned int seconds, days; | |
95 | unsigned int alarmseconds; | |
96 | int ret; | |
97 | ||
0307b0d7 | 98 | days = div_s64_rem(secs, SEC_PER_DAY, &seconds); |
1c97872b UKK |
99 | |
100 | mc13xxx_lock(priv->mc13xxx); | |
101 | ||
102 | /* | |
103 | * temporarily invalidate alarm to prevent triggering it when the day is | |
104 | * already updated while the time isn't yet. | |
105 | */ | |
106 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTODA, &alarmseconds); | |
107 | if (unlikely(ret)) | |
108 | goto out; | |
109 | ||
6a2b3422 | 110 | if (alarmseconds < SEC_PER_DAY) { |
1c97872b UKK |
111 | ret = mc13xxx_reg_write(priv->mc13xxx, |
112 | MC13XXX_RTCTODA, 0x1ffff); | |
113 | if (unlikely(ret)) | |
114 | goto out; | |
115 | } | |
116 | ||
117 | /* | |
118 | * write seconds=0 to prevent a day switch between writing days | |
119 | * and seconds below | |
120 | */ | |
121 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTOD, 0); | |
122 | if (unlikely(ret)) | |
123 | goto out; | |
124 | ||
125 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCDAY, days); | |
126 | if (unlikely(ret)) | |
127 | goto out; | |
128 | ||
129 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTOD, seconds); | |
130 | if (unlikely(ret)) | |
131 | goto out; | |
132 | ||
133 | /* restore alarm */ | |
6a2b3422 | 134 | if (alarmseconds < SEC_PER_DAY) { |
1c97872b UKK |
135 | ret = mc13xxx_reg_write(priv->mc13xxx, |
136 | MC13XXX_RTCTODA, alarmseconds); | |
137 | if (unlikely(ret)) | |
138 | goto out; | |
139 | } | |
140 | ||
12de3621 AS |
141 | if (!priv->valid) { |
142 | ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_RTCRST); | |
143 | if (unlikely(ret)) | |
144 | goto out; | |
145 | ||
146 | ret = mc13xxx_irq_unmask(priv->mc13xxx, MC13XXX_IRQ_RTCRST); | |
147 | } | |
1c97872b | 148 | |
1c97872b UKK |
149 | out: |
150 | priv->valid = !ret; | |
151 | ||
152 | mc13xxx_unlock(priv->mc13xxx); | |
153 | ||
154 | return ret; | |
155 | } | |
156 | ||
157 | static int mc13xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) | |
158 | { | |
159 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); | |
160 | unsigned seconds, days; | |
0307b0d7 | 161 | time64_t s1970; |
1c97872b UKK |
162 | int enabled, pending; |
163 | int ret; | |
164 | ||
165 | mc13xxx_lock(priv->mc13xxx); | |
166 | ||
167 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTODA, &seconds); | |
168 | if (unlikely(ret)) | |
169 | goto out; | |
6a2b3422 | 170 | if (seconds >= SEC_PER_DAY) { |
1c97872b UKK |
171 | ret = -ENODATA; |
172 | goto out; | |
173 | } | |
174 | ||
175 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days); | |
176 | if (unlikely(ret)) | |
177 | goto out; | |
178 | ||
179 | ret = mc13xxx_irq_status(priv->mc13xxx, MC13XXX_IRQ_TODA, | |
180 | &enabled, &pending); | |
181 | ||
182 | out: | |
183 | mc13xxx_unlock(priv->mc13xxx); | |
184 | ||
185 | if (ret) | |
186 | return ret; | |
187 | ||
188 | alarm->enabled = enabled; | |
189 | alarm->pending = pending; | |
190 | ||
0307b0d7 | 191 | s1970 = (time64_t)days * SEC_PER_DAY + seconds; |
1c97872b | 192 | |
0307b0d7 XP |
193 | rtc_time64_to_tm(s1970, &alarm->time); |
194 | dev_dbg(dev, "%s: %lld\n", __func__, (long long)s1970); | |
1c97872b UKK |
195 | |
196 | return 0; | |
197 | } | |
198 | ||
199 | static int mc13xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) | |
200 | { | |
201 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); | |
0307b0d7 XP |
202 | time64_t s1970; |
203 | u32 seconds, days; | |
1c97872b UKK |
204 | int ret; |
205 | ||
206 | mc13xxx_lock(priv->mc13xxx); | |
207 | ||
208 | /* disable alarm to prevent false triggering */ | |
209 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTODA, 0x1ffff); | |
210 | if (unlikely(ret)) | |
211 | goto out; | |
212 | ||
213 | ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_TODA); | |
214 | if (unlikely(ret)) | |
215 | goto out; | |
216 | ||
0307b0d7 | 217 | s1970 = rtc_tm_to_time64(&alarm->time); |
1c97872b | 218 | |
99c14e4d | 219 | dev_dbg(dev, "%s: %s %lld\n", __func__, alarm->enabled ? "on" : "off", |
0307b0d7 | 220 | (long long)s1970); |
1c97872b UKK |
221 | |
222 | ret = mc13xxx_rtc_irq_enable_unlocked(dev, alarm->enabled, | |
223 | MC13XXX_IRQ_TODA); | |
224 | if (unlikely(ret)) | |
225 | goto out; | |
226 | ||
0307b0d7 | 227 | days = div_s64_rem(s1970, SEC_PER_DAY, &seconds); |
1c97872b UKK |
228 | |
229 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCDAYA, days); | |
230 | if (unlikely(ret)) | |
231 | goto out; | |
232 | ||
233 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTODA, seconds); | |
234 | ||
235 | out: | |
236 | mc13xxx_unlock(priv->mc13xxx); | |
237 | ||
238 | return ret; | |
239 | } | |
240 | ||
241 | static irqreturn_t mc13xxx_rtc_alarm_handler(int irq, void *dev) | |
242 | { | |
243 | struct mc13xxx_rtc *priv = dev; | |
244 | struct mc13xxx *mc13xxx = priv->mc13xxx; | |
245 | ||
1c97872b UKK |
246 | rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_AF); |
247 | ||
248 | mc13xxx_irq_ack(mc13xxx, irq); | |
249 | ||
250 | return IRQ_HANDLED; | |
251 | } | |
252 | ||
1c97872b UKK |
253 | static const struct rtc_class_ops mc13xxx_rtc_ops = { |
254 | .read_time = mc13xxx_rtc_read_time, | |
0307b0d7 | 255 | .set_mmss64 = mc13xxx_rtc_set_mmss, |
1c97872b UKK |
256 | .read_alarm = mc13xxx_rtc_read_alarm, |
257 | .set_alarm = mc13xxx_rtc_set_alarm, | |
258 | .alarm_irq_enable = mc13xxx_rtc_alarm_irq_enable, | |
1c97872b UKK |
259 | }; |
260 | ||
261 | static irqreturn_t mc13xxx_rtc_reset_handler(int irq, void *dev) | |
262 | { | |
263 | struct mc13xxx_rtc *priv = dev; | |
264 | struct mc13xxx *mc13xxx = priv->mc13xxx; | |
265 | ||
1c97872b UKK |
266 | priv->valid = 0; |
267 | ||
268 | mc13xxx_irq_mask(mc13xxx, irq); | |
269 | ||
270 | return IRQ_HANDLED; | |
271 | } | |
272 | ||
db5cf8d1 | 273 | static int __init mc13xxx_rtc_probe(struct platform_device *pdev) |
1c97872b UKK |
274 | { |
275 | int ret; | |
276 | struct mc13xxx_rtc *priv; | |
277 | struct mc13xxx *mc13xxx; | |
1c97872b | 278 | |
a379fd24 | 279 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
1c97872b UKK |
280 | if (!priv) |
281 | return -ENOMEM; | |
282 | ||
283 | mc13xxx = dev_get_drvdata(pdev->dev.parent); | |
284 | priv->mc13xxx = mc13xxx; | |
12de3621 | 285 | priv->valid = 1; |
1c97872b UKK |
286 | |
287 | platform_set_drvdata(pdev, priv); | |
288 | ||
289 | mc13xxx_lock(mc13xxx); | |
290 | ||
12de3621 AS |
291 | mc13xxx_irq_ack(mc13xxx, MC13XXX_IRQ_RTCRST); |
292 | ||
1c97872b UKK |
293 | ret = mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_RTCRST, |
294 | mc13xxx_rtc_reset_handler, DRIVER_NAME, priv); | |
295 | if (ret) | |
5ab9a52a | 296 | goto err_irq_request; |
1c97872b | 297 | |
1c97872b UKK |
298 | ret = mc13xxx_irq_request_nounmask(mc13xxx, MC13XXX_IRQ_TODA, |
299 | mc13xxx_rtc_alarm_handler, DRIVER_NAME, priv); | |
5ab9a52a AS |
300 | if (ret) |
301 | goto err_irq_request; | |
1c97872b | 302 | |
5ab9a52a AS |
303 | mc13xxx_unlock(mc13xxx); |
304 | ||
305 | priv->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, | |
306 | &mc13xxx_rtc_ops, THIS_MODULE); | |
1c97872b | 307 | |
5ab9a52a AS |
308 | return 0; |
309 | ||
310 | err_irq_request: | |
311 | mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_TODA, priv); | |
589e5014 | 312 | mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_RTCRST, priv); |
1c97872b | 313 | |
589e5014 | 314 | mc13xxx_unlock(mc13xxx); |
1c97872b | 315 | |
1c97872b UKK |
316 | return ret; |
317 | } | |
318 | ||
77bf2ea8 | 319 | static int mc13xxx_rtc_remove(struct platform_device *pdev) |
1c97872b UKK |
320 | { |
321 | struct mc13xxx_rtc *priv = platform_get_drvdata(pdev); | |
322 | ||
323 | mc13xxx_lock(priv->mc13xxx); | |
324 | ||
1c97872b | 325 | mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TODA, priv); |
1c97872b UKK |
326 | mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_RTCRST, priv); |
327 | ||
328 | mc13xxx_unlock(priv->mc13xxx); | |
329 | ||
1c97872b UKK |
330 | return 0; |
331 | } | |
332 | ||
a46481d7 | 333 | static const struct platform_device_id mc13xxx_rtc_idtable[] = { |
1c97872b UKK |
334 | { |
335 | .name = "mc13783-rtc", | |
336 | }, { | |
337 | .name = "mc13892-rtc", | |
19a1ac50 UKK |
338 | }, { |
339 | .name = "mc34708-rtc", | |
1c97872b | 340 | }, |
0f636fc1 | 341 | { /* sentinel */ } |
1c97872b | 342 | }; |
0f636fc1 | 343 | MODULE_DEVICE_TABLE(platform, mc13xxx_rtc_idtable); |
1c97872b UKK |
344 | |
345 | static struct platform_driver mc13xxx_rtc_driver = { | |
346 | .id_table = mc13xxx_rtc_idtable, | |
77bf2ea8 | 347 | .remove = mc13xxx_rtc_remove, |
1c97872b UKK |
348 | .driver = { |
349 | .name = DRIVER_NAME, | |
1c97872b UKK |
350 | }, |
351 | }; | |
352 | ||
09fb7ad1 | 353 | module_platform_driver_probe(mc13xxx_rtc_driver, &mc13xxx_rtc_probe); |
1c97872b UKK |
354 | |
355 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); | |
356 | MODULE_DESCRIPTION("RTC driver for Freescale MC13XXX PMIC"); | |
357 | MODULE_LICENSE("GPL v2"); |