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edd6d79e | 1 | // SPDX-License-Identifier: GPL-2.0 |
1c97872b UKK |
2 | /* |
3 | * Real Time Clock driver for Freescale MC13XXX PMIC | |
4 | * | |
5 | * (C) 2009 Sascha Hauer, Pengutronix | |
6 | * (C) 2009 Uwe Kleine-Koenig, Pengutronix | |
1c97872b UKK |
7 | */ |
8 | ||
9 | #include <linux/mfd/mc13xxx.h> | |
10 | #include <linux/platform_device.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/module.h> | |
ac316725 | 13 | #include <linux/mod_devicetable.h> |
1c97872b UKK |
14 | #include <linux/slab.h> |
15 | #include <linux/rtc.h> | |
16 | ||
17 | #define DRIVER_NAME "mc13xxx-rtc" | |
18 | ||
19 | #define MC13XXX_RTCTOD 20 | |
20 | #define MC13XXX_RTCTODA 21 | |
21 | #define MC13XXX_RTCDAY 22 | |
22 | #define MC13XXX_RTCDAYA 23 | |
23 | ||
6a2b3422 AS |
24 | #define SEC_PER_DAY (24 * 60 * 60) |
25 | ||
1c97872b UKK |
26 | struct mc13xxx_rtc { |
27 | struct rtc_device *rtc; | |
28 | struct mc13xxx *mc13xxx; | |
29 | int valid; | |
30 | }; | |
31 | ||
32 | static int mc13xxx_rtc_irq_enable_unlocked(struct device *dev, | |
33 | unsigned int enabled, int irq) | |
34 | { | |
35 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); | |
36 | int (*func)(struct mc13xxx *mc13xxx, int irq); | |
37 | ||
38 | if (!priv->valid) | |
39 | return -ENODATA; | |
40 | ||
41 | func = enabled ? mc13xxx_irq_unmask : mc13xxx_irq_mask; | |
42 | return func(priv->mc13xxx, irq); | |
43 | } | |
44 | ||
2fb004a9 AS |
45 | static int mc13xxx_rtc_alarm_irq_enable(struct device *dev, |
46 | unsigned int enabled) | |
1c97872b UKK |
47 | { |
48 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); | |
49 | int ret; | |
50 | ||
51 | mc13xxx_lock(priv->mc13xxx); | |
52 | ||
2fb004a9 | 53 | ret = mc13xxx_rtc_irq_enable_unlocked(dev, enabled, MC13XXX_IRQ_TODA); |
1c97872b UKK |
54 | |
55 | mc13xxx_unlock(priv->mc13xxx); | |
56 | ||
57 | return ret; | |
58 | } | |
59 | ||
60 | static int mc13xxx_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
61 | { | |
62 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); | |
63 | unsigned int seconds, days1, days2; | |
1c97872b | 64 | |
12de3621 AS |
65 | if (!priv->valid) |
66 | return -ENODATA; | |
1c97872b | 67 | |
6a2b3422 AS |
68 | do { |
69 | int ret; | |
1c97872b | 70 | |
6a2b3422 AS |
71 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days1); |
72 | if (ret) | |
73 | return ret; | |
1c97872b | 74 | |
6a2b3422 AS |
75 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTOD, &seconds); |
76 | if (ret) | |
77 | return ret; | |
1c97872b | 78 | |
6a2b3422 AS |
79 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days2); |
80 | if (ret) | |
81 | return ret; | |
82 | } while (days1 != days2); | |
1c97872b | 83 | |
0307b0d7 | 84 | rtc_time64_to_tm((time64_t)days1 * SEC_PER_DAY + seconds, tm); |
1c97872b | 85 | |
146d21bd | 86 | return 0; |
1c97872b UKK |
87 | } |
88 | ||
eee86dea | 89 | static int mc13xxx_rtc_set_time(struct device *dev, struct rtc_time *tm) |
1c97872b UKK |
90 | { |
91 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); | |
92 | unsigned int seconds, days; | |
93 | unsigned int alarmseconds; | |
94 | int ret; | |
95 | ||
eee86dea | 96 | days = div_s64_rem(rtc_tm_to_time64(tm), SEC_PER_DAY, &seconds); |
1c97872b UKK |
97 | |
98 | mc13xxx_lock(priv->mc13xxx); | |
99 | ||
100 | /* | |
101 | * temporarily invalidate alarm to prevent triggering it when the day is | |
102 | * already updated while the time isn't yet. | |
103 | */ | |
104 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTODA, &alarmseconds); | |
105 | if (unlikely(ret)) | |
106 | goto out; | |
107 | ||
6a2b3422 | 108 | if (alarmseconds < SEC_PER_DAY) { |
1c97872b UKK |
109 | ret = mc13xxx_reg_write(priv->mc13xxx, |
110 | MC13XXX_RTCTODA, 0x1ffff); | |
111 | if (unlikely(ret)) | |
112 | goto out; | |
113 | } | |
114 | ||
115 | /* | |
116 | * write seconds=0 to prevent a day switch between writing days | |
117 | * and seconds below | |
118 | */ | |
119 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTOD, 0); | |
120 | if (unlikely(ret)) | |
121 | goto out; | |
122 | ||
123 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCDAY, days); | |
124 | if (unlikely(ret)) | |
125 | goto out; | |
126 | ||
127 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTOD, seconds); | |
128 | if (unlikely(ret)) | |
129 | goto out; | |
130 | ||
131 | /* restore alarm */ | |
6a2b3422 | 132 | if (alarmseconds < SEC_PER_DAY) { |
1c97872b UKK |
133 | ret = mc13xxx_reg_write(priv->mc13xxx, |
134 | MC13XXX_RTCTODA, alarmseconds); | |
135 | if (unlikely(ret)) | |
136 | goto out; | |
137 | } | |
138 | ||
12de3621 AS |
139 | if (!priv->valid) { |
140 | ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_RTCRST); | |
141 | if (unlikely(ret)) | |
142 | goto out; | |
143 | ||
144 | ret = mc13xxx_irq_unmask(priv->mc13xxx, MC13XXX_IRQ_RTCRST); | |
145 | } | |
1c97872b | 146 | |
1c97872b UKK |
147 | out: |
148 | priv->valid = !ret; | |
149 | ||
150 | mc13xxx_unlock(priv->mc13xxx); | |
151 | ||
152 | return ret; | |
153 | } | |
154 | ||
155 | static int mc13xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) | |
156 | { | |
157 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); | |
9fc0fd50 | 158 | unsigned int seconds, days; |
0307b0d7 | 159 | time64_t s1970; |
1c97872b UKK |
160 | int enabled, pending; |
161 | int ret; | |
162 | ||
163 | mc13xxx_lock(priv->mc13xxx); | |
164 | ||
165 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTODA, &seconds); | |
166 | if (unlikely(ret)) | |
167 | goto out; | |
6a2b3422 | 168 | if (seconds >= SEC_PER_DAY) { |
1c97872b UKK |
169 | ret = -ENODATA; |
170 | goto out; | |
171 | } | |
172 | ||
173 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days); | |
174 | if (unlikely(ret)) | |
175 | goto out; | |
176 | ||
177 | ret = mc13xxx_irq_status(priv->mc13xxx, MC13XXX_IRQ_TODA, | |
178 | &enabled, &pending); | |
179 | ||
180 | out: | |
181 | mc13xxx_unlock(priv->mc13xxx); | |
182 | ||
183 | if (ret) | |
184 | return ret; | |
185 | ||
186 | alarm->enabled = enabled; | |
187 | alarm->pending = pending; | |
188 | ||
0307b0d7 | 189 | s1970 = (time64_t)days * SEC_PER_DAY + seconds; |
1c97872b | 190 | |
0307b0d7 XP |
191 | rtc_time64_to_tm(s1970, &alarm->time); |
192 | dev_dbg(dev, "%s: %lld\n", __func__, (long long)s1970); | |
1c97872b UKK |
193 | |
194 | return 0; | |
195 | } | |
196 | ||
197 | static int mc13xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) | |
198 | { | |
199 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); | |
0307b0d7 XP |
200 | time64_t s1970; |
201 | u32 seconds, days; | |
1c97872b UKK |
202 | int ret; |
203 | ||
204 | mc13xxx_lock(priv->mc13xxx); | |
205 | ||
206 | /* disable alarm to prevent false triggering */ | |
207 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTODA, 0x1ffff); | |
208 | if (unlikely(ret)) | |
209 | goto out; | |
210 | ||
211 | ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_TODA); | |
212 | if (unlikely(ret)) | |
213 | goto out; | |
214 | ||
0307b0d7 | 215 | s1970 = rtc_tm_to_time64(&alarm->time); |
1c97872b | 216 | |
99c14e4d | 217 | dev_dbg(dev, "%s: %s %lld\n", __func__, alarm->enabled ? "on" : "off", |
0307b0d7 | 218 | (long long)s1970); |
1c97872b UKK |
219 | |
220 | ret = mc13xxx_rtc_irq_enable_unlocked(dev, alarm->enabled, | |
221 | MC13XXX_IRQ_TODA); | |
222 | if (unlikely(ret)) | |
223 | goto out; | |
224 | ||
0307b0d7 | 225 | days = div_s64_rem(s1970, SEC_PER_DAY, &seconds); |
1c97872b UKK |
226 | |
227 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCDAYA, days); | |
228 | if (unlikely(ret)) | |
229 | goto out; | |
230 | ||
231 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTODA, seconds); | |
232 | ||
233 | out: | |
234 | mc13xxx_unlock(priv->mc13xxx); | |
235 | ||
236 | return ret; | |
237 | } | |
238 | ||
239 | static irqreturn_t mc13xxx_rtc_alarm_handler(int irq, void *dev) | |
240 | { | |
241 | struct mc13xxx_rtc *priv = dev; | |
242 | struct mc13xxx *mc13xxx = priv->mc13xxx; | |
243 | ||
1c97872b UKK |
244 | rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_AF); |
245 | ||
246 | mc13xxx_irq_ack(mc13xxx, irq); | |
247 | ||
248 | return IRQ_HANDLED; | |
249 | } | |
250 | ||
1c97872b UKK |
251 | static const struct rtc_class_ops mc13xxx_rtc_ops = { |
252 | .read_time = mc13xxx_rtc_read_time, | |
eee86dea | 253 | .set_time = mc13xxx_rtc_set_time, |
1c97872b UKK |
254 | .read_alarm = mc13xxx_rtc_read_alarm, |
255 | .set_alarm = mc13xxx_rtc_set_alarm, | |
256 | .alarm_irq_enable = mc13xxx_rtc_alarm_irq_enable, | |
1c97872b UKK |
257 | }; |
258 | ||
259 | static irqreturn_t mc13xxx_rtc_reset_handler(int irq, void *dev) | |
260 | { | |
261 | struct mc13xxx_rtc *priv = dev; | |
262 | struct mc13xxx *mc13xxx = priv->mc13xxx; | |
263 | ||
1c97872b UKK |
264 | priv->valid = 0; |
265 | ||
266 | mc13xxx_irq_mask(mc13xxx, irq); | |
267 | ||
268 | return IRQ_HANDLED; | |
269 | } | |
270 | ||
db5cf8d1 | 271 | static int __init mc13xxx_rtc_probe(struct platform_device *pdev) |
1c97872b UKK |
272 | { |
273 | int ret; | |
274 | struct mc13xxx_rtc *priv; | |
275 | struct mc13xxx *mc13xxx; | |
1c97872b | 276 | |
a379fd24 | 277 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
1c97872b UKK |
278 | if (!priv) |
279 | return -ENOMEM; | |
280 | ||
281 | mc13xxx = dev_get_drvdata(pdev->dev.parent); | |
282 | priv->mc13xxx = mc13xxx; | |
12de3621 | 283 | priv->valid = 1; |
1c97872b | 284 | |
e4ae7023 AB |
285 | priv->rtc = devm_rtc_allocate_device(&pdev->dev); |
286 | if (IS_ERR(priv->rtc)) | |
287 | return PTR_ERR(priv->rtc); | |
1c97872b UKK |
288 | platform_set_drvdata(pdev, priv); |
289 | ||
e4ae7023 AB |
290 | priv->rtc->ops = &mc13xxx_rtc_ops; |
291 | /* 15bit days + hours, minutes, seconds */ | |
292 | priv->rtc->range_max = (timeu64_t)(1 << 15) * SEC_PER_DAY - 1; | |
293 | ||
1c97872b UKK |
294 | mc13xxx_lock(mc13xxx); |
295 | ||
12de3621 AS |
296 | mc13xxx_irq_ack(mc13xxx, MC13XXX_IRQ_RTCRST); |
297 | ||
1c97872b UKK |
298 | ret = mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_RTCRST, |
299 | mc13xxx_rtc_reset_handler, DRIVER_NAME, priv); | |
300 | if (ret) | |
5ab9a52a | 301 | goto err_irq_request; |
1c97872b | 302 | |
1c97872b UKK |
303 | ret = mc13xxx_irq_request_nounmask(mc13xxx, MC13XXX_IRQ_TODA, |
304 | mc13xxx_rtc_alarm_handler, DRIVER_NAME, priv); | |
5ab9a52a AS |
305 | if (ret) |
306 | goto err_irq_request; | |
1c97872b | 307 | |
5ab9a52a AS |
308 | mc13xxx_unlock(mc13xxx); |
309 | ||
fdcfd854 | 310 | ret = devm_rtc_register_device(priv->rtc); |
8816cd72 QW |
311 | if (ret) { |
312 | mc13xxx_lock(mc13xxx); | |
e4ae7023 | 313 | goto err_irq_request; |
8816cd72 | 314 | } |
1c97872b | 315 | |
5ab9a52a AS |
316 | return 0; |
317 | ||
318 | err_irq_request: | |
319 | mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_TODA, priv); | |
589e5014 | 320 | mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_RTCRST, priv); |
1c97872b | 321 | |
589e5014 | 322 | mc13xxx_unlock(mc13xxx); |
1c97872b | 323 | |
1c97872b UKK |
324 | return ret; |
325 | } | |
326 | ||
77bf2ea8 | 327 | static int mc13xxx_rtc_remove(struct platform_device *pdev) |
1c97872b UKK |
328 | { |
329 | struct mc13xxx_rtc *priv = platform_get_drvdata(pdev); | |
330 | ||
331 | mc13xxx_lock(priv->mc13xxx); | |
332 | ||
1c97872b | 333 | mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TODA, priv); |
1c97872b UKK |
334 | mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_RTCRST, priv); |
335 | ||
336 | mc13xxx_unlock(priv->mc13xxx); | |
337 | ||
1c97872b UKK |
338 | return 0; |
339 | } | |
340 | ||
a46481d7 | 341 | static const struct platform_device_id mc13xxx_rtc_idtable[] = { |
1c97872b UKK |
342 | { |
343 | .name = "mc13783-rtc", | |
344 | }, { | |
345 | .name = "mc13892-rtc", | |
19a1ac50 UKK |
346 | }, { |
347 | .name = "mc34708-rtc", | |
1c97872b | 348 | }, |
0f636fc1 | 349 | { /* sentinel */ } |
1c97872b | 350 | }; |
0f636fc1 | 351 | MODULE_DEVICE_TABLE(platform, mc13xxx_rtc_idtable); |
1c97872b UKK |
352 | |
353 | static struct platform_driver mc13xxx_rtc_driver = { | |
354 | .id_table = mc13xxx_rtc_idtable, | |
77bf2ea8 | 355 | .remove = mc13xxx_rtc_remove, |
1c97872b UKK |
356 | .driver = { |
357 | .name = DRIVER_NAME, | |
1c97872b UKK |
358 | }, |
359 | }; | |
360 | ||
09fb7ad1 | 361 | module_platform_driver_probe(mc13xxx_rtc_driver, &mc13xxx_rtc_probe); |
1c97872b UKK |
362 | |
363 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); | |
364 | MODULE_DESCRIPTION("RTC driver for Freescale MC13XXX PMIC"); | |
365 | MODULE_LICENSE("GPL v2"); |