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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
Alexander Shiyan6a2b3422014-04-03 14:50:01 -070086 rtc_time_to_tm(days1 * SEC_PER_DAY + seconds, tm);
Uwe Kleine-König1c978722010-10-28 12:30:53 +020087
88 return rtc_valid_tm(tm);
89}
90
91static 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
Alexander Shiyan6a2b3422014-04-03 14:50:01 -070098 seconds = secs % SEC_PER_DAY;
99 days = secs / SEC_PER_DAY;
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200100
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
Alexander Shiyan6a2b3422014-04-03 14:50:01 -0700111 if (alarmseconds < SEC_PER_DAY) {
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200112 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 */
Alexander Shiyan6a2b3422014-04-03 14:50:01 -0700135 if (alarmseconds < SEC_PER_DAY) {
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200136 ret = mc13xxx_reg_write(priv->mc13xxx,
137 MC13XXX_RTCTODA, alarmseconds);
138 if (unlikely(ret))
139 goto out;
140 }
141
Alexander Shiyan12de3622014-04-03 14:50:00 -0700142 if (!priv->valid) {
143 ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_RTCRST);
144 if (unlikely(ret))
145 goto out;
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200146
Alexander Shiyan12de3622014-04-03 14:50:00 -0700147 ret = mc13xxx_irq_unmask(priv->mc13xxx, MC13XXX_IRQ_RTCRST);
148 }
149
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200150out:
151 priv->valid = !ret;
152
153 mc13xxx_unlock(priv->mc13xxx);
154
155 return ret;
156}
157
158static 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;
Alexander Shiyan6a2b3422014-04-03 14:50:01 -0700171 if (seconds >= SEC_PER_DAY) {
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200172 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
183out:
184 mc13xxx_unlock(priv->mc13xxx);
185
186 if (ret)
187 return ret;
188
189 alarm->enabled = enabled;
190 alarm->pending = pending;
191
Alexander Shiyan6a2b3422014-04-03 14:50:01 -0700192 s1970 = days * SEC_PER_DAY + seconds;
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200193
194 rtc_time_to_tm(s1970, &alarm->time);
195 dev_dbg(dev, "%s: %lu\n", __func__, s1970);
196
197 return 0;
198}
199
200static 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
Alexander Shiyan6a2b3422014-04-03 14:50:01 -0700230 seconds = s1970 % SEC_PER_DAY;
231 days = s1970 / SEC_PER_DAY;
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200232
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
239out:
240 mc13xxx_unlock(priv->mc13xxx);
241
242 return ret;
243}
244
245static irqreturn_t mc13xxx_rtc_alarm_handler(int irq, void *dev)
246{
247 struct mc13xxx_rtc *priv = dev;
248 struct mc13xxx *mc13xxx = priv->mc13xxx;
249
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200250 rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_AF);
251
252 mc13xxx_irq_ack(mc13xxx, irq);
253
254 return IRQ_HANDLED;
255}
256
257static irqreturn_t mc13xxx_rtc_update_handler(int irq, void *dev)
258{
259 struct mc13xxx_rtc *priv = dev;
260 struct mc13xxx *mc13xxx = priv->mc13xxx;
261
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200262 rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_UF);
263
264 mc13xxx_irq_ack(mc13xxx, irq);
265
266 return IRQ_HANDLED;
267}
268
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200269static const struct rtc_class_ops mc13xxx_rtc_ops = {
270 .read_time = mc13xxx_rtc_read_time,
271 .set_mmss = mc13xxx_rtc_set_mmss,
272 .read_alarm = mc13xxx_rtc_read_alarm,
273 .set_alarm = mc13xxx_rtc_set_alarm,
274 .alarm_irq_enable = mc13xxx_rtc_alarm_irq_enable,
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200275};
276
277static irqreturn_t mc13xxx_rtc_reset_handler(int irq, void *dev)
278{
279 struct mc13xxx_rtc *priv = dev;
280 struct mc13xxx *mc13xxx = priv->mc13xxx;
281
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200282 priv->valid = 0;
283
284 mc13xxx_irq_mask(mc13xxx, irq);
285
286 return IRQ_HANDLED;
287}
288
Uwe Kleine-Königdb5cf8d2011-11-02 13:37:56 -0700289static int __init mc13xxx_rtc_probe(struct platform_device *pdev)
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200290{
291 int ret;
292 struct mc13xxx_rtc *priv;
293 struct mc13xxx *mc13xxx;
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200294
Jingoo Hana379fd22013-04-29 16:20:44 -0700295 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200296 if (!priv)
297 return -ENOMEM;
298
299 mc13xxx = dev_get_drvdata(pdev->dev.parent);
300 priv->mc13xxx = mc13xxx;
Alexander Shiyan12de3622014-04-03 14:50:00 -0700301 priv->valid = 1;
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200302
303 platform_set_drvdata(pdev, priv);
304
305 mc13xxx_lock(mc13xxx);
306
Alexander Shiyan12de3622014-04-03 14:50:00 -0700307 mc13xxx_irq_ack(mc13xxx, MC13XXX_IRQ_RTCRST);
308
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200309 ret = mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_RTCRST,
310 mc13xxx_rtc_reset_handler, DRIVER_NAME, priv);
311 if (ret)
Alexander Shiyan5ab9a522014-04-03 14:50:15 -0700312 goto err_irq_request;
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200313
Alexander Shiyanfb1bd9a2014-04-03 14:49:59 -0700314 ret = mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_1HZ,
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200315 mc13xxx_rtc_update_handler, DRIVER_NAME, priv);
316 if (ret)
Alexander Shiyan5ab9a522014-04-03 14:50:15 -0700317 goto err_irq_request;
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200318
319 ret = mc13xxx_irq_request_nounmask(mc13xxx, MC13XXX_IRQ_TODA,
320 mc13xxx_rtc_alarm_handler, DRIVER_NAME, priv);
Alexander Shiyan5ab9a522014-04-03 14:50:15 -0700321 if (ret)
322 goto err_irq_request;
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200323
Alexander Shiyan5ab9a522014-04-03 14:50:15 -0700324 mc13xxx_unlock(mc13xxx);
325
326 priv->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
327 &mc13xxx_rtc_ops, THIS_MODULE);
328
329 return 0;
330
331err_irq_request:
332 mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_TODA, priv);
Alexander Shiyan589e5012014-04-03 14:49:57 -0700333 mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_1HZ, priv);
Alexander Shiyan589e5012014-04-03 14:49:57 -0700334 mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_RTCRST, priv);
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200335
Alexander Shiyan589e5012014-04-03 14:49:57 -0700336 mc13xxx_unlock(mc13xxx);
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200337
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200338 return ret;
339}
340
Alexander Shiyan77bf2ea2014-04-03 14:49:56 -0700341static int mc13xxx_rtc_remove(struct platform_device *pdev)
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200342{
343 struct mc13xxx_rtc *priv = platform_get_drvdata(pdev);
344
345 mc13xxx_lock(priv->mc13xxx);
346
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200347 mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TODA, priv);
348 mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_1HZ, priv);
349 mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_RTCRST, priv);
350
351 mc13xxx_unlock(priv->mc13xxx);
352
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200353 return 0;
354}
355
Axel Lina46481d2012-01-10 15:10:52 -0800356static const struct platform_device_id mc13xxx_rtc_idtable[] = {
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200357 {
358 .name = "mc13783-rtc",
359 }, {
360 .name = "mc13892-rtc",
Uwe Kleine-König19a1ac52012-07-30 14:41:52 -0700361 }, {
362 .name = "mc34708-rtc",
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200363 },
Uwe Kleine-König0f636fc2012-07-30 14:41:50 -0700364 { /* sentinel */ }
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200365};
Uwe Kleine-König0f636fc2012-07-30 14:41:50 -0700366MODULE_DEVICE_TABLE(platform, mc13xxx_rtc_idtable);
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200367
368static struct platform_driver mc13xxx_rtc_driver = {
369 .id_table = mc13xxx_rtc_idtable,
Alexander Shiyan77bf2ea2014-04-03 14:49:56 -0700370 .remove = mc13xxx_rtc_remove,
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200371 .driver = {
372 .name = DRIVER_NAME,
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200373 },
374};
375
Jingoo Han09fb7ad2013-04-29 16:18:43 -0700376module_platform_driver_probe(mc13xxx_rtc_driver, &mc13xxx_rtc_probe);
Uwe Kleine-König1c978722010-10-28 12:30:53 +0200377
378MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
379MODULE_DESCRIPTION("RTC driver for Freescale MC13XXX PMIC");
380MODULE_LICENSE("GPL v2");