blob: a65868065743efc9ad37068ca594922e9c31171f [file] [log] [blame]
Uwe Kleine-König1c978722010-10-28 12:30:53 +02001/*
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
Alexander Shiyan6a2b3422014-04-03 14:50:01 -070026#define SEC_PER_DAY (24 * 60 * 60)
27
Uwe Kleine-König1c978722010-10-28 12:30:53 +020028struct mc13xxx_rtc {
29 struct rtc_device *rtc;
30 struct mc13xxx *mc13xxx;
31 int valid;
32};
33
34static 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
Alexander Shiyan2fb004a2014-04-03 14:49:58 -070047static int mc13xxx_rtc_alarm_irq_enable(struct device *dev,
48 unsigned int enabled)
Uwe Kleine-König1c978722010-10-28 12:30:53 +020049{
50 struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
51 int ret;
52
53 mc13xxx_lock(priv->mc13xxx);
54
Alexander Shiyan2fb004a2014-04-03 14:49:58 -070055 ret = mc13xxx_rtc_irq_enable_unlocked(dev, enabled, MC13XXX_IRQ_TODA);
Uwe Kleine-König1c978722010-10-28 12:30:53 +020056
57 mc13xxx_unlock(priv->mc13xxx);
58
59 return ret;
60}
61
62static 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;
Uwe Kleine-König1c978722010-10-28 12:30:53 +020066
Alexander Shiyan12de3622014-04-03 14:50:00 -070067 if (!priv->valid)
68 return -ENODATA;
Uwe Kleine-König1c978722010-10-28 12:30:53 +020069
Alexander Shiyan6a2b3422014-04-03 14:50:01 -070070 do {
71 int ret;
Uwe Kleine-König1c978722010-10-28 12:30:53 +020072
Alexander Shiyan6a2b3422014-04-03 14:50:01 -070073 ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days1);
74 if (ret)
75 return ret;
Uwe Kleine-König1c978722010-10-28 12:30:53 +020076
Alexander Shiyan6a2b3422014-04-03 14:50:01 -070077 ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTOD, &seconds);
78 if (ret)
79 return ret;
Uwe Kleine-König1c978722010-10-28 12:30:53 +020080
Alexander Shiyan6a2b3422014-04-03 14:50:01 -070081 ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days2);
82 if (ret)
83 return ret;
84 } while (days1 != days2);
Uwe Kleine-König1c978722010-10-28 12:30:53 +020085
Xunlei Pang0307b0d2015-04-01 20:34:30 -070086 rtc_time64_to_tm((time64_t)days1 * SEC_PER_DAY + seconds, tm);
Uwe Kleine-König1c978722010-10-28 12:30:53 +020087
88 return rtc_valid_tm(tm);
89}
90
Xunlei Pang0307b0d2015-04-01 20:34:30 -070091static int mc13xxx_rtc_set_mmss(struct device *dev, time64_t secs)
Uwe Kleine-König1c978722010-10-28 12:30:53 +020092{
93 struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
94 unsigned int seconds, days;
95 unsigned int alarmseconds;
96 int ret;
97
Xunlei Pang0307b0d2015-04-01 20:34:30 -070098 days = div_s64_rem(secs, SEC_PER_DAY, &seconds);
Uwe Kleine-König1c978722010-10-28 12:30:53 +020099
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
Alexander Shiyan6a2b3422014-04-03 14:50:01 -0700110 if (alarmseconds < SEC_PER_DAY) {
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200111 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 */
Alexander Shiyan6a2b3422014-04-03 14:50:01 -0700134 if (alarmseconds < SEC_PER_DAY) {
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200135 ret = mc13xxx_reg_write(priv->mc13xxx,
136 MC13XXX_RTCTODA, alarmseconds);
137 if (unlikely(ret))
138 goto out;
139 }
140
Alexander Shiyan12de3622014-04-03 14:50:00 -0700141 if (!priv->valid) {
142 ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_RTCRST);
143 if (unlikely(ret))
144 goto out;
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200145
Alexander Shiyan12de3622014-04-03 14:50:00 -0700146 ret = mc13xxx_irq_unmask(priv->mc13xxx, MC13XXX_IRQ_RTCRST);
147 }
148
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200149out:
150 priv->valid = !ret;
151
152 mc13xxx_unlock(priv->mc13xxx);
153
154 return ret;
155}
156
157static 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;
Xunlei Pang0307b0d2015-04-01 20:34:30 -0700161 time64_t s1970;
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200162 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;
Alexander Shiyan6a2b3422014-04-03 14:50:01 -0700170 if (seconds >= SEC_PER_DAY) {
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200171 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
182out:
183 mc13xxx_unlock(priv->mc13xxx);
184
185 if (ret)
186 return ret;
187
188 alarm->enabled = enabled;
189 alarm->pending = pending;
190
Xunlei Pang0307b0d2015-04-01 20:34:30 -0700191 s1970 = (time64_t)days * SEC_PER_DAY + seconds;
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200192
Xunlei Pang0307b0d2015-04-01 20:34:30 -0700193 rtc_time64_to_tm(s1970, &alarm->time);
194 dev_dbg(dev, "%s: %lld\n", __func__, (long long)s1970);
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200195
196 return 0;
197}
198
199static int mc13xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
200{
201 struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
Xunlei Pang0307b0d2015-04-01 20:34:30 -0700202 time64_t s1970;
203 u32 seconds, days;
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200204 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
Xunlei Pang0307b0d2015-04-01 20:34:30 -0700217 s1970 = rtc_tm_to_time64(&alarm->time);
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200218
Rasmus Villemoes99c14e42015-02-20 14:47:30 +0100219 dev_dbg(dev, "%s: %s %lld\n", __func__, alarm->enabled ? "on" : "off",
Xunlei Pang0307b0d2015-04-01 20:34:30 -0700220 (long long)s1970);
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200221
222 ret = mc13xxx_rtc_irq_enable_unlocked(dev, alarm->enabled,
223 MC13XXX_IRQ_TODA);
224 if (unlikely(ret))
225 goto out;
226
Xunlei Pang0307b0d2015-04-01 20:34:30 -0700227 days = div_s64_rem(s1970, SEC_PER_DAY, &seconds);
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200228
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
235out:
236 mc13xxx_unlock(priv->mc13xxx);
237
238 return ret;
239}
240
241static irqreturn_t mc13xxx_rtc_alarm_handler(int irq, void *dev)
242{
243 struct mc13xxx_rtc *priv = dev;
244 struct mc13xxx *mc13xxx = priv->mc13xxx;
245
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200246 rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_AF);
247
248 mc13xxx_irq_ack(mc13xxx, irq);
249
250 return IRQ_HANDLED;
251}
252
253static irqreturn_t mc13xxx_rtc_update_handler(int irq, void *dev)
254{
255 struct mc13xxx_rtc *priv = dev;
256 struct mc13xxx *mc13xxx = priv->mc13xxx;
257
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200258 rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_UF);
259
260 mc13xxx_irq_ack(mc13xxx, irq);
261
262 return IRQ_HANDLED;
263}
264
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200265static const struct rtc_class_ops mc13xxx_rtc_ops = {
266 .read_time = mc13xxx_rtc_read_time,
Xunlei Pang0307b0d2015-04-01 20:34:30 -0700267 .set_mmss64 = mc13xxx_rtc_set_mmss,
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200268 .read_alarm = mc13xxx_rtc_read_alarm,
269 .set_alarm = mc13xxx_rtc_set_alarm,
270 .alarm_irq_enable = mc13xxx_rtc_alarm_irq_enable,
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200271};
272
273static irqreturn_t mc13xxx_rtc_reset_handler(int irq, void *dev)
274{
275 struct mc13xxx_rtc *priv = dev;
276 struct mc13xxx *mc13xxx = priv->mc13xxx;
277
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200278 priv->valid = 0;
279
280 mc13xxx_irq_mask(mc13xxx, irq);
281
282 return IRQ_HANDLED;
283}
284
Uwe Kleine-Königdb5cf8d2011-11-02 13:37:56 -0700285static int __init mc13xxx_rtc_probe(struct platform_device *pdev)
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200286{
287 int ret;
288 struct mc13xxx_rtc *priv;
289 struct mc13xxx *mc13xxx;
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200290
Jingoo Hana379fd22013-04-29 16:20:44 -0700291 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200292 if (!priv)
293 return -ENOMEM;
294
295 mc13xxx = dev_get_drvdata(pdev->dev.parent);
296 priv->mc13xxx = mc13xxx;
Alexander Shiyan12de3622014-04-03 14:50:00 -0700297 priv->valid = 1;
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200298
299 platform_set_drvdata(pdev, priv);
300
301 mc13xxx_lock(mc13xxx);
302
Alexander Shiyan12de3622014-04-03 14:50:00 -0700303 mc13xxx_irq_ack(mc13xxx, MC13XXX_IRQ_RTCRST);
304
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200305 ret = mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_RTCRST,
306 mc13xxx_rtc_reset_handler, DRIVER_NAME, priv);
307 if (ret)
Alexander Shiyan5ab9a522014-04-03 14:50:15 -0700308 goto err_irq_request;
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200309
Alexander Shiyanfb1bd9a2014-04-03 14:49:59 -0700310 ret = mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_1HZ,
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200311 mc13xxx_rtc_update_handler, DRIVER_NAME, priv);
312 if (ret)
Alexander Shiyan5ab9a522014-04-03 14:50:15 -0700313 goto err_irq_request;
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200314
315 ret = mc13xxx_irq_request_nounmask(mc13xxx, MC13XXX_IRQ_TODA,
316 mc13xxx_rtc_alarm_handler, DRIVER_NAME, priv);
Alexander Shiyan5ab9a522014-04-03 14:50:15 -0700317 if (ret)
318 goto err_irq_request;
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200319
Alexander Shiyan5ab9a522014-04-03 14:50:15 -0700320 mc13xxx_unlock(mc13xxx);
321
322 priv->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
323 &mc13xxx_rtc_ops, THIS_MODULE);
324
325 return 0;
326
327err_irq_request:
328 mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_TODA, priv);
Alexander Shiyan589e5012014-04-03 14:49:57 -0700329 mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_1HZ, priv);
Alexander Shiyan589e5012014-04-03 14:49:57 -0700330 mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_RTCRST, priv);
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200331
Alexander Shiyan589e5012014-04-03 14:49:57 -0700332 mc13xxx_unlock(mc13xxx);
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200333
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200334 return ret;
335}
336
Alexander Shiyan77bf2ea2014-04-03 14:49:56 -0700337static int mc13xxx_rtc_remove(struct platform_device *pdev)
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200338{
339 struct mc13xxx_rtc *priv = platform_get_drvdata(pdev);
340
341 mc13xxx_lock(priv->mc13xxx);
342
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200343 mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TODA, priv);
344 mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_1HZ, priv);
345 mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_RTCRST, priv);
346
347 mc13xxx_unlock(priv->mc13xxx);
348
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200349 return 0;
350}
351
Axel Lina46481d2012-01-10 15:10:52 -0800352static const struct platform_device_id mc13xxx_rtc_idtable[] = {
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200353 {
354 .name = "mc13783-rtc",
355 }, {
356 .name = "mc13892-rtc",
Uwe Kleine-König19a1ac52012-07-30 14:41:52 -0700357 }, {
358 .name = "mc34708-rtc",
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200359 },
Uwe Kleine-König0f636fc2012-07-30 14:41:50 -0700360 { /* sentinel */ }
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200361};
Uwe Kleine-König0f636fc2012-07-30 14:41:50 -0700362MODULE_DEVICE_TABLE(platform, mc13xxx_rtc_idtable);
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200363
364static struct platform_driver mc13xxx_rtc_driver = {
365 .id_table = mc13xxx_rtc_idtable,
Alexander Shiyan77bf2ea2014-04-03 14:49:56 -0700366 .remove = mc13xxx_rtc_remove,
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200367 .driver = {
368 .name = DRIVER_NAME,
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200369 },
370};
371
Jingoo Han09fb7ad2013-04-29 16:18:43 -0700372module_platform_driver_probe(mc13xxx_rtc_driver, &mc13xxx_rtc_probe);
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200373
374MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
375MODULE_DESCRIPTION("RTC driver for Freescale MC13XXX PMIC");
376MODULE_LICENSE("GPL v2");