rtc: pm8xxx: move device_init_wakeup() before rtc_register
[deliverable/linux.git] / drivers / rtc / rtc-mc13xxx.c
CommitLineData
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
28struct 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
2fb004a9
AS
47static 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
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;
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
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
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
150out:
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;
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
183out:
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
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
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
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
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
259static 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
273static 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
281static 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 294static 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
336err_reset_irq_status:
589e5014 337 mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_RTCRST, priv);
1c97872b 338
1c97872b 339err_reset_irq_request:
589e5014 340 mc13xxx_unlock(mc13xxx);
1c97872b 341
1c97872b
UKK
342 return ret;
343}
344
77bf2ea8 345static 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 360static 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 370MODULE_DEVICE_TABLE(platform, mc13xxx_rtc_idtable);
1c97872b
UKK
371
372static 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 381module_platform_driver_probe(mc13xxx_rtc_driver, &mc13xxx_rtc_probe);
1c97872b
UKK
382
383MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
384MODULE_DESCRIPTION("RTC driver for Freescale MC13XXX PMIC");
385MODULE_LICENSE("GPL v2");
This page took 0.264785 seconds and 5 git commands to generate.