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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright © 2014-2023 Broadcom
4 */
5
6#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7
8#include <linux/clk.h>
9#include <linux/device.h>
10#include <linux/err.h>
11#include <linux/init.h>
12#include <linux/interrupt.h>
13#include <linux/io.h>
14#include <linux/irqreturn.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/of.h>
18#include <linux/platform_device.h>
19#include <linux/pm.h>
20#include <linux/pm_wakeup.h>
21#include <linux/reboot.h>
22#include <linux/rtc.h>
23#include <linux/stat.h>
24#include <linux/suspend.h>
25
26struct brcmstb_waketmr {
27 struct rtc_device *rtc;
28 struct device *dev;
29 void __iomem *base;
30 unsigned int wake_irq;
31 unsigned int alarm_irq;
32 struct notifier_block reboot_notifier;
33 struct clk *clk;
34 u32 rate;
35 unsigned long rtc_alarm;
36 bool alarm_en;
37 bool alarm_expired;
38};
39
40#define BRCMSTB_WKTMR_EVENT 0x00
41#define WKTMR_ALARM_EVENT BIT(0)
42#define BRCMSTB_WKTMR_COUNTER 0x04
43#define BRCMSTB_WKTMR_ALARM 0x08
44#define BRCMSTB_WKTMR_PRESCALER 0x0C
45#define BRCMSTB_WKTMR_PRESCALER_VAL 0x10
46
47#define BRCMSTB_WKTMR_DEFAULT_FREQ 27000000
48
49static inline bool brcmstb_waketmr_is_pending(struct brcmstb_waketmr *timer)
50{
51 u32 reg;
52
53 reg = readl_relaxed(timer->base + BRCMSTB_WKTMR_EVENT);
54 return !!(reg & WKTMR_ALARM_EVENT);
55}
56
57static inline void brcmstb_waketmr_clear_alarm(struct brcmstb_waketmr *timer)
58{
59 u32 reg;
60
61 if (timer->alarm_en && timer->alarm_irq)
62 disable_irq(timer->alarm_irq);
63 timer->alarm_en = false;
64 reg = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);
65 writel_relaxed(reg - 1, timer->base + BRCMSTB_WKTMR_ALARM);
66 writel_relaxed(WKTMR_ALARM_EVENT, timer->base + BRCMSTB_WKTMR_EVENT);
67 (void)readl_relaxed(timer->base + BRCMSTB_WKTMR_EVENT);
68 if (timer->alarm_expired) {
69 timer->alarm_expired = false;
70 /* maintain call balance */
71 enable_irq(timer->alarm_irq);
72 }
73}
74
75static void brcmstb_waketmr_set_alarm(struct brcmstb_waketmr *timer,
76 unsigned int secs)
77{
78 unsigned int now;
79
80 brcmstb_waketmr_clear_alarm(timer);
81
82 /* Make sure we are actually counting in seconds */
83 writel_relaxed(timer->rate, timer->base + BRCMSTB_WKTMR_PRESCALER);
84
85 writel_relaxed(secs, timer->base + BRCMSTB_WKTMR_ALARM);
86 now = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);
87
88 while ((int)(secs - now) <= 0 &&
89 !brcmstb_waketmr_is_pending(timer)) {
90 secs = now + 1;
91 writel_relaxed(secs, timer->base + BRCMSTB_WKTMR_ALARM);
92 now = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);
93 }
94}
95
96static irqreturn_t brcmstb_waketmr_irq(int irq, void *data)
97{
98 struct brcmstb_waketmr *timer = data;
99
100 if (!timer->alarm_irq)
101 pm_wakeup_event(timer->dev, 0);
102 return IRQ_HANDLED;
103}
104
105static irqreturn_t brcmstb_alarm_irq(int irq, void *data)
106{
107 struct brcmstb_waketmr *timer = data;
108
109 /* Ignore spurious interrupts */
110 if (!brcmstb_waketmr_is_pending(timer))
111 return IRQ_HANDLED;
112
113 if (timer->alarm_en) {
114 if (device_may_wakeup(timer->dev)) {
115 disable_irq_nosync(irq);
116 timer->alarm_expired = true;
117 } else {
118 writel_relaxed(WKTMR_ALARM_EVENT,
119 timer->base + BRCMSTB_WKTMR_EVENT);
120 }
121 rtc_update_irq(timer->rtc, 1, RTC_IRQF | RTC_AF);
122 } else {
123 writel_relaxed(WKTMR_ALARM_EVENT,
124 timer->base + BRCMSTB_WKTMR_EVENT);
125 }
126
127 return IRQ_HANDLED;
128}
129
130struct wktmr_time {
131 u32 sec;
132 u32 pre;
133};
134
135static void wktmr_read(struct brcmstb_waketmr *timer,
136 struct wktmr_time *t)
137{
138 u32 tmp;
139
140 do {
141 t->sec = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);
142 tmp = readl_relaxed(timer->base + BRCMSTB_WKTMR_PRESCALER_VAL);
143 } while (tmp >= timer->rate);
144
145 t->pre = timer->rate - tmp;
146}
147
148static int brcmstb_waketmr_prepare_suspend(struct brcmstb_waketmr *timer)
149{
150 struct device *dev = timer->dev;
151 int ret;
152
153 if (device_may_wakeup(dev)) {
154 ret = enable_irq_wake(timer->wake_irq);
155 if (ret) {
156 dev_err(dev, "failed to enable wake-up interrupt\n");
157 return ret;
158 }
159 if (timer->alarm_en && timer->alarm_irq) {
160 ret = enable_irq_wake(timer->alarm_irq);
161 if (ret) {
162 dev_err(dev, "failed to enable rtc interrupt\n");
163 disable_irq_wake(timer->wake_irq);
164 return ret;
165 }
166 }
167 }
168
169 return 0;
170}
171
172/* If enabled as a wakeup-source, arm the timer when powering off */
173static int brcmstb_waketmr_reboot(struct notifier_block *nb,
174 unsigned long action, void *data)
175{
176 struct brcmstb_waketmr *timer;
177
178 timer = container_of(nb, struct brcmstb_waketmr, reboot_notifier);
179
180 /* Set timer for cold boot */
181 if (action == SYS_POWER_OFF)
182 brcmstb_waketmr_prepare_suspend(timer);
183
184 return NOTIFY_DONE;
185}
186
187static int brcmstb_waketmr_gettime(struct device *dev,
188 struct rtc_time *tm)
189{
190 struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
191 struct wktmr_time now;
192
193 wktmr_read(timer, &now);
194
195 rtc_time64_to_tm(now.sec, tm);
196
197 return 0;
198}
199
200static int brcmstb_waketmr_settime(struct device *dev,
201 struct rtc_time *tm)
202{
203 struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
204 time64_t sec;
205
206 sec = rtc_tm_to_time64(tm);
207
208 writel_relaxed(sec, timer->base + BRCMSTB_WKTMR_COUNTER);
209
210 return 0;
211}
212
213static int brcmstb_waketmr_getalarm(struct device *dev,
214 struct rtc_wkalrm *alarm)
215{
216 struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
217
218 alarm->enabled = timer->alarm_en;
219 rtc_time64_to_tm(timer->rtc_alarm, &alarm->time);
220
221 alarm->pending = brcmstb_waketmr_is_pending(timer);
222
223 return 0;
224}
225
226static int brcmstb_waketmr_alarm_enable(struct device *dev,
227 unsigned int enabled)
228{
229 struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
230
231 if (enabled && !timer->alarm_en) {
232 if ((int)(readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER) -
233 readl_relaxed(timer->base + BRCMSTB_WKTMR_ALARM)) >= 0 &&
234 !brcmstb_waketmr_is_pending(timer))
235 return -EINVAL;
236 timer->alarm_en = true;
237 if (timer->alarm_irq) {
238 if (timer->alarm_expired) {
239 timer->alarm_expired = false;
240 /* maintain call balance */
241 enable_irq(timer->alarm_irq);
242 }
243 enable_irq(timer->alarm_irq);
244 }
245 } else if (!enabled && timer->alarm_en) {
246 if (timer->alarm_irq)
247 disable_irq(timer->alarm_irq);
248 timer->alarm_en = false;
249 }
250
251 return 0;
252}
253
254static int brcmstb_waketmr_setalarm(struct device *dev,
255 struct rtc_wkalrm *alarm)
256{
257 struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
258
259 timer->rtc_alarm = rtc_tm_to_time64(&alarm->time);
260
261 brcmstb_waketmr_set_alarm(timer, timer->rtc_alarm);
262
263 return brcmstb_waketmr_alarm_enable(dev, alarm->enabled);
264}
265
266static const struct rtc_class_ops brcmstb_waketmr_ops = {
267 .read_time = brcmstb_waketmr_gettime,
268 .set_time = brcmstb_waketmr_settime,
269 .read_alarm = brcmstb_waketmr_getalarm,
270 .set_alarm = brcmstb_waketmr_setalarm,
271 .alarm_irq_enable = brcmstb_waketmr_alarm_enable,
272};
273
274static int brcmstb_waketmr_probe(struct platform_device *pdev)
275{
276 struct device *dev = &pdev->dev;
277 struct brcmstb_waketmr *timer;
278 int ret;
279
280 timer = devm_kzalloc(dev, sizeof(*timer), GFP_KERNEL);
281 if (!timer)
282 return -ENOMEM;
283
284 platform_set_drvdata(pdev, timer);
285 timer->dev = dev;
286
287 timer->base = devm_platform_ioremap_resource(pdev, 0);
288 if (IS_ERR(timer->base))
289 return PTR_ERR(timer->base);
290
291 timer->rtc = devm_rtc_allocate_device(dev);
292 if (IS_ERR(timer->rtc))
293 return PTR_ERR(timer->rtc);
294
295 /*
296 * Set wakeup capability before requesting wakeup interrupt, so we can
297 * process boot-time "wakeups" (e.g., from S5 soft-off)
298 */
299 device_init_wakeup(dev, true);
300
301 ret = platform_get_irq(pdev, 0);
302 if (ret < 0)
303 return -ENODEV;
304 timer->wake_irq = (unsigned int)ret;
305
306 timer->clk = devm_clk_get(dev, NULL);
307 if (!IS_ERR(timer->clk)) {
308 ret = clk_prepare_enable(timer->clk);
309 if (ret)
310 return ret;
311 timer->rate = clk_get_rate(timer->clk);
312 if (!timer->rate)
313 timer->rate = BRCMSTB_WKTMR_DEFAULT_FREQ;
314 } else {
315 timer->rate = BRCMSTB_WKTMR_DEFAULT_FREQ;
316 timer->clk = NULL;
317 }
318
319 ret = devm_request_irq(dev, timer->wake_irq, brcmstb_waketmr_irq, 0,
320 "brcmstb-waketimer", timer);
321 if (ret < 0)
322 goto err_clk;
323
324 brcmstb_waketmr_clear_alarm(timer);
325
326 /* Attempt to initialize non-wake irq */
327 ret = platform_get_irq(pdev, 1);
328 if (ret > 0) {
329 timer->alarm_irq = (unsigned int)ret;
330 ret = devm_request_irq(dev, timer->alarm_irq, brcmstb_alarm_irq,
331 IRQF_NO_AUTOEN, "brcmstb-waketimer-rtc",
332 timer);
333 if (ret < 0)
334 timer->alarm_irq = 0;
335 }
336
337 timer->reboot_notifier.notifier_call = brcmstb_waketmr_reboot;
338 register_reboot_notifier(&timer->reboot_notifier);
339
340 timer->rtc->ops = &brcmstb_waketmr_ops;
341 timer->rtc->range_max = U32_MAX;
342
343 ret = devm_rtc_register_device(timer->rtc);
344 if (ret)
345 goto err_notifier;
346
347 return 0;
348
349err_notifier:
350 unregister_reboot_notifier(&timer->reboot_notifier);
351
352err_clk:
353 clk_disable_unprepare(timer->clk);
354
355 return ret;
356}
357
358static void brcmstb_waketmr_remove(struct platform_device *pdev)
359{
360 struct brcmstb_waketmr *timer = dev_get_drvdata(&pdev->dev);
361
362 unregister_reboot_notifier(&timer->reboot_notifier);
363 clk_disable_unprepare(timer->clk);
364}
365
366#ifdef CONFIG_PM_SLEEP
367static int brcmstb_waketmr_suspend(struct device *dev)
368{
369 struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
370
371 return brcmstb_waketmr_prepare_suspend(timer);
372}
373
374static int brcmstb_waketmr_suspend_noirq(struct device *dev)
375{
376 struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
377
378 /* Catch any alarms occurring prior to noirq */
379 if (timer->alarm_expired && device_may_wakeup(dev))
380 return -EBUSY;
381
382 return 0;
383}
384
385static int brcmstb_waketmr_resume(struct device *dev)
386{
387 struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
388 int ret;
389
390 if (!device_may_wakeup(dev))
391 return 0;
392
393 ret = disable_irq_wake(timer->wake_irq);
394 if (timer->alarm_en && timer->alarm_irq)
395 disable_irq_wake(timer->alarm_irq);
396
397 brcmstb_waketmr_clear_alarm(timer);
398
399 return ret;
400}
401#else
402#define brcmstb_waketmr_suspend NULL
403#define brcmstb_waketmr_suspend_noirq NULL
404#define brcmstb_waketmr_resume NULL
405#endif /* CONFIG_PM_SLEEP */
406
407static const struct dev_pm_ops brcmstb_waketmr_pm_ops = {
408 .suspend = brcmstb_waketmr_suspend,
409 .suspend_noirq = brcmstb_waketmr_suspend_noirq,
410 .resume = brcmstb_waketmr_resume,
411};
412
413static const __maybe_unused struct of_device_id brcmstb_waketmr_of_match[] = {
414 { .compatible = "brcm,brcmstb-waketimer" },
415 { /* sentinel */ },
416};
417
418static struct platform_driver brcmstb_waketmr_driver = {
419 .probe = brcmstb_waketmr_probe,
420 .remove_new = brcmstb_waketmr_remove,
421 .driver = {
422 .name = "brcmstb-waketimer",
423 .pm = &brcmstb_waketmr_pm_ops,
424 .of_match_table = of_match_ptr(brcmstb_waketmr_of_match),
425 }
426};
427module_platform_driver(brcmstb_waketmr_driver);
428
429MODULE_LICENSE("GPL v2");
430MODULE_AUTHOR("Brian Norris");
431MODULE_AUTHOR("Markus Mayer");
432MODULE_AUTHOR("Doug Berger");
433MODULE_DESCRIPTION("Wake-up timer driver for STB chips");
1/*
2 * Copyright © 2014-2017 Broadcom
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16#include <linux/clk.h>
17#include <linux/device.h>
18#include <linux/err.h>
19#include <linux/init.h>
20#include <linux/interrupt.h>
21#include <linux/io.h>
22#include <linux/irqreturn.h>
23#include <linux/kernel.h>
24#include <linux/module.h>
25#include <linux/of.h>
26#include <linux/platform_device.h>
27#include <linux/pm.h>
28#include <linux/pm_wakeup.h>
29#include <linux/reboot.h>
30#include <linux/rtc.h>
31#include <linux/stat.h>
32#include <linux/suspend.h>
33
34struct brcmstb_waketmr {
35 struct rtc_device *rtc;
36 struct device *dev;
37 void __iomem *base;
38 int irq;
39 struct notifier_block reboot_notifier;
40 struct clk *clk;
41 u32 rate;
42};
43
44#define BRCMSTB_WKTMR_EVENT 0x00
45#define BRCMSTB_WKTMR_COUNTER 0x04
46#define BRCMSTB_WKTMR_ALARM 0x08
47#define BRCMSTB_WKTMR_PRESCALER 0x0C
48#define BRCMSTB_WKTMR_PRESCALER_VAL 0x10
49
50#define BRCMSTB_WKTMR_DEFAULT_FREQ 27000000
51
52static inline void brcmstb_waketmr_clear_alarm(struct brcmstb_waketmr *timer)
53{
54 writel_relaxed(1, timer->base + BRCMSTB_WKTMR_EVENT);
55 (void)readl_relaxed(timer->base + BRCMSTB_WKTMR_EVENT);
56}
57
58static void brcmstb_waketmr_set_alarm(struct brcmstb_waketmr *timer,
59 unsigned int secs)
60{
61 brcmstb_waketmr_clear_alarm(timer);
62
63 /* Make sure we are actually counting in seconds */
64 writel_relaxed(timer->rate, timer->base + BRCMSTB_WKTMR_PRESCALER);
65
66 writel_relaxed(secs + 1, timer->base + BRCMSTB_WKTMR_ALARM);
67}
68
69static irqreturn_t brcmstb_waketmr_irq(int irq, void *data)
70{
71 struct brcmstb_waketmr *timer = data;
72
73 pm_wakeup_event(timer->dev, 0);
74
75 return IRQ_HANDLED;
76}
77
78struct wktmr_time {
79 u32 sec;
80 u32 pre;
81};
82
83static void wktmr_read(struct brcmstb_waketmr *timer,
84 struct wktmr_time *t)
85{
86 u32 tmp;
87
88 do {
89 t->sec = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);
90 tmp = readl_relaxed(timer->base + BRCMSTB_WKTMR_PRESCALER_VAL);
91 } while (tmp >= timer->rate);
92
93 t->pre = timer->rate - tmp;
94}
95
96static int brcmstb_waketmr_prepare_suspend(struct brcmstb_waketmr *timer)
97{
98 struct device *dev = timer->dev;
99 int ret = 0;
100
101 if (device_may_wakeup(dev)) {
102 ret = enable_irq_wake(timer->irq);
103 if (ret) {
104 dev_err(dev, "failed to enable wake-up interrupt\n");
105 return ret;
106 }
107 }
108
109 return ret;
110}
111
112/* If enabled as a wakeup-source, arm the timer when powering off */
113static int brcmstb_waketmr_reboot(struct notifier_block *nb,
114 unsigned long action, void *data)
115{
116 struct brcmstb_waketmr *timer;
117
118 timer = container_of(nb, struct brcmstb_waketmr, reboot_notifier);
119
120 /* Set timer for cold boot */
121 if (action == SYS_POWER_OFF)
122 brcmstb_waketmr_prepare_suspend(timer);
123
124 return NOTIFY_DONE;
125}
126
127static int brcmstb_waketmr_gettime(struct device *dev,
128 struct rtc_time *tm)
129{
130 struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
131 struct wktmr_time now;
132
133 wktmr_read(timer, &now);
134
135 rtc_time_to_tm(now.sec, tm);
136
137 return 0;
138}
139
140static int brcmstb_waketmr_settime(struct device *dev,
141 struct rtc_time *tm)
142{
143 struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
144 time64_t sec;
145
146 sec = rtc_tm_to_time64(tm);
147
148 if (sec > U32_MAX || sec < 0)
149 return -EINVAL;
150
151 writel_relaxed(sec, timer->base + BRCMSTB_WKTMR_COUNTER);
152
153 return 0;
154}
155
156static int brcmstb_waketmr_getalarm(struct device *dev,
157 struct rtc_wkalrm *alarm)
158{
159 struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
160 time64_t sec;
161 u32 reg;
162
163 sec = readl_relaxed(timer->base + BRCMSTB_WKTMR_ALARM);
164 if (sec != 0) {
165 /* Alarm is enabled */
166 alarm->enabled = 1;
167 rtc_time64_to_tm(sec, &alarm->time);
168 }
169
170 reg = readl_relaxed(timer->base + BRCMSTB_WKTMR_EVENT);
171 alarm->pending = !!(reg & 1);
172
173 return 0;
174}
175
176static int brcmstb_waketmr_setalarm(struct device *dev,
177 struct rtc_wkalrm *alarm)
178{
179 struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
180 time64_t sec;
181
182 if (alarm->enabled)
183 sec = rtc_tm_to_time64(&alarm->time);
184 else
185 sec = 0;
186
187 if (sec > U32_MAX || sec < 0)
188 return -EINVAL;
189
190 brcmstb_waketmr_set_alarm(timer, sec);
191
192 return 0;
193}
194
195/*
196 * Does not do much but keep the RTC class happy. We always support
197 * alarms.
198 */
199static int brcmstb_waketmr_alarm_enable(struct device *dev,
200 unsigned int enabled)
201{
202 return 0;
203}
204
205static const struct rtc_class_ops brcmstb_waketmr_ops = {
206 .read_time = brcmstb_waketmr_gettime,
207 .set_time = brcmstb_waketmr_settime,
208 .read_alarm = brcmstb_waketmr_getalarm,
209 .set_alarm = brcmstb_waketmr_setalarm,
210 .alarm_irq_enable = brcmstb_waketmr_alarm_enable,
211};
212
213static int brcmstb_waketmr_probe(struct platform_device *pdev)
214{
215 struct device *dev = &pdev->dev;
216 struct brcmstb_waketmr *timer;
217 struct resource *res;
218 int ret;
219
220 timer = devm_kzalloc(dev, sizeof(*timer), GFP_KERNEL);
221 if (!timer)
222 return -ENOMEM;
223
224 platform_set_drvdata(pdev, timer);
225 timer->dev = dev;
226
227 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
228 timer->base = devm_ioremap_resource(dev, res);
229 if (IS_ERR(timer->base))
230 return PTR_ERR(timer->base);
231
232 /*
233 * Set wakeup capability before requesting wakeup interrupt, so we can
234 * process boot-time "wakeups" (e.g., from S5 soft-off)
235 */
236 device_set_wakeup_capable(dev, true);
237 device_wakeup_enable(dev);
238
239 timer->irq = platform_get_irq(pdev, 0);
240 if (timer->irq < 0)
241 return -ENODEV;
242
243 timer->clk = devm_clk_get(dev, NULL);
244 if (!IS_ERR(timer->clk)) {
245 ret = clk_prepare_enable(timer->clk);
246 if (ret)
247 return ret;
248 timer->rate = clk_get_rate(timer->clk);
249 if (!timer->rate)
250 timer->rate = BRCMSTB_WKTMR_DEFAULT_FREQ;
251 } else {
252 timer->rate = BRCMSTB_WKTMR_DEFAULT_FREQ;
253 timer->clk = NULL;
254 }
255
256 ret = devm_request_irq(dev, timer->irq, brcmstb_waketmr_irq, 0,
257 "brcmstb-waketimer", timer);
258 if (ret < 0)
259 goto err_clk;
260
261 timer->reboot_notifier.notifier_call = brcmstb_waketmr_reboot;
262 register_reboot_notifier(&timer->reboot_notifier);
263
264 timer->rtc = rtc_device_register("brcmstb-waketmr", dev,
265 &brcmstb_waketmr_ops, THIS_MODULE);
266 if (IS_ERR(timer->rtc)) {
267 dev_err(dev, "unable to register device\n");
268 ret = PTR_ERR(timer->rtc);
269 goto err_notifier;
270 }
271
272 dev_info(dev, "registered, with irq %d\n", timer->irq);
273
274 return 0;
275
276err_notifier:
277 unregister_reboot_notifier(&timer->reboot_notifier);
278
279err_clk:
280 if (timer->clk)
281 clk_disable_unprepare(timer->clk);
282
283 return ret;
284}
285
286static int brcmstb_waketmr_remove(struct platform_device *pdev)
287{
288 struct brcmstb_waketmr *timer = dev_get_drvdata(&pdev->dev);
289
290 unregister_reboot_notifier(&timer->reboot_notifier);
291 rtc_device_unregister(timer->rtc);
292
293 return 0;
294}
295
296#ifdef CONFIG_PM_SLEEP
297static int brcmstb_waketmr_suspend(struct device *dev)
298{
299 struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
300
301 return brcmstb_waketmr_prepare_suspend(timer);
302}
303
304static int brcmstb_waketmr_resume(struct device *dev)
305{
306 struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
307 int ret;
308
309 if (!device_may_wakeup(dev))
310 return 0;
311
312 ret = disable_irq_wake(timer->irq);
313
314 brcmstb_waketmr_clear_alarm(timer);
315
316 return ret;
317}
318#endif /* CONFIG_PM_SLEEP */
319
320static SIMPLE_DEV_PM_OPS(brcmstb_waketmr_pm_ops,
321 brcmstb_waketmr_suspend, brcmstb_waketmr_resume);
322
323static const struct of_device_id brcmstb_waketmr_of_match[] = {
324 { .compatible = "brcm,brcmstb-waketimer" },
325 { /* sentinel */ },
326};
327
328static struct platform_driver brcmstb_waketmr_driver = {
329 .probe = brcmstb_waketmr_probe,
330 .remove = brcmstb_waketmr_remove,
331 .driver = {
332 .name = "brcmstb-waketimer",
333 .pm = &brcmstb_waketmr_pm_ops,
334 .of_match_table = of_match_ptr(brcmstb_waketmr_of_match),
335 }
336};
337module_platform_driver(brcmstb_waketmr_driver);
338
339MODULE_LICENSE("GPL v2");
340MODULE_AUTHOR("Brian Norris");
341MODULE_AUTHOR("Markus Mayer");
342MODULE_DESCRIPTION("Wake-up timer driver for STB chips");