Commit | Line | Data |
---|---|---|
db68b189 DB |
1 | /* |
2 | * TI OMAP1 Real Time Clock interface for Linux | |
3 | * | |
4 | * Copyright (C) 2003 MontaVista Software, Inc. | |
5 | * Author: George G. Davis <gdavis@mvista.com> or <source@mvista.com> | |
6 | * | |
7 | * Copyright (C) 2006 David Brownell (new RTC framework) | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
15 | #include <linux/kernel.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/ioport.h> | |
19 | #include <linux/delay.h> | |
20 | #include <linux/rtc.h> | |
21 | #include <linux/bcd.h> | |
22 | #include <linux/platform_device.h> | |
9e0344dc AM |
23 | #include <linux/of.h> |
24 | #include <linux/of_device.h> | |
fc9bd902 | 25 | #include <linux/pm_runtime.h> |
4b30c9fc | 26 | #include <linux/io.h> |
db68b189 DB |
27 | |
28 | /* The OMAP1 RTC is a year/month/day/hours/minutes/seconds BCD clock | |
29 | * with century-range alarm matching, driven by the 32kHz clock. | |
30 | * | |
31 | * The main user-visible ways it differs from PC RTCs are by omitting | |
32 | * "don't care" alarm fields and sub-second periodic IRQs, and having | |
33 | * an autoadjust mechanism to calibrate to the true oscillator rate. | |
34 | * | |
35 | * Board-specific wiring options include using split power mode with | |
36 | * RTC_OFF_NOFF used as the reset signal (so the RTC won't be reset), | |
37 | * and wiring RTC_WAKE_INT (so the RTC alarm can wake the system from | |
fa5b0782 SN |
38 | * low power modes) for OMAP1 boards (OMAP-L138 has this built into |
39 | * the SoC). See the BOARD-SPECIFIC CUSTOMIZATION comment. | |
db68b189 DB |
40 | */ |
41 | ||
cab1458c AM |
42 | #define DRIVER_NAME "omap_rtc" |
43 | ||
db68b189 DB |
44 | #define OMAP_RTC_BASE 0xfffb4800 |
45 | ||
46 | /* RTC registers */ | |
47 | #define OMAP_RTC_SECONDS_REG 0x00 | |
48 | #define OMAP_RTC_MINUTES_REG 0x04 | |
49 | #define OMAP_RTC_HOURS_REG 0x08 | |
50 | #define OMAP_RTC_DAYS_REG 0x0C | |
51 | #define OMAP_RTC_MONTHS_REG 0x10 | |
52 | #define OMAP_RTC_YEARS_REG 0x14 | |
53 | #define OMAP_RTC_WEEKS_REG 0x18 | |
54 | ||
55 | #define OMAP_RTC_ALARM_SECONDS_REG 0x20 | |
56 | #define OMAP_RTC_ALARM_MINUTES_REG 0x24 | |
57 | #define OMAP_RTC_ALARM_HOURS_REG 0x28 | |
58 | #define OMAP_RTC_ALARM_DAYS_REG 0x2c | |
59 | #define OMAP_RTC_ALARM_MONTHS_REG 0x30 | |
60 | #define OMAP_RTC_ALARM_YEARS_REG 0x34 | |
61 | ||
62 | #define OMAP_RTC_CTRL_REG 0x40 | |
63 | #define OMAP_RTC_STATUS_REG 0x44 | |
64 | #define OMAP_RTC_INTERRUPTS_REG 0x48 | |
65 | ||
66 | #define OMAP_RTC_COMP_LSB_REG 0x4c | |
67 | #define OMAP_RTC_COMP_MSB_REG 0x50 | |
68 | #define OMAP_RTC_OSC_REG 0x54 | |
69 | ||
cab1458c AM |
70 | #define OMAP_RTC_KICK0_REG 0x6c |
71 | #define OMAP_RTC_KICK1_REG 0x70 | |
72 | ||
8af750e3 HG |
73 | #define OMAP_RTC_IRQWAKEEN 0x7c |
74 | ||
db68b189 | 75 | /* OMAP_RTC_CTRL_REG bit fields: */ |
92adb96a SN |
76 | #define OMAP_RTC_CTRL_SPLIT BIT(7) |
77 | #define OMAP_RTC_CTRL_DISABLE BIT(6) | |
78 | #define OMAP_RTC_CTRL_SET_32_COUNTER BIT(5) | |
79 | #define OMAP_RTC_CTRL_TEST BIT(4) | |
80 | #define OMAP_RTC_CTRL_MODE_12_24 BIT(3) | |
81 | #define OMAP_RTC_CTRL_AUTO_COMP BIT(2) | |
82 | #define OMAP_RTC_CTRL_ROUND_30S BIT(1) | |
83 | #define OMAP_RTC_CTRL_STOP BIT(0) | |
db68b189 DB |
84 | |
85 | /* OMAP_RTC_STATUS_REG bit fields: */ | |
92adb96a SN |
86 | #define OMAP_RTC_STATUS_POWER_UP BIT(7) |
87 | #define OMAP_RTC_STATUS_ALARM BIT(6) | |
88 | #define OMAP_RTC_STATUS_1D_EVENT BIT(5) | |
89 | #define OMAP_RTC_STATUS_1H_EVENT BIT(4) | |
90 | #define OMAP_RTC_STATUS_1M_EVENT BIT(3) | |
91 | #define OMAP_RTC_STATUS_1S_EVENT BIT(2) | |
92 | #define OMAP_RTC_STATUS_RUN BIT(1) | |
93 | #define OMAP_RTC_STATUS_BUSY BIT(0) | |
db68b189 DB |
94 | |
95 | /* OMAP_RTC_INTERRUPTS_REG bit fields: */ | |
92adb96a SN |
96 | #define OMAP_RTC_INTERRUPTS_IT_ALARM BIT(3) |
97 | #define OMAP_RTC_INTERRUPTS_IT_TIMER BIT(2) | |
db68b189 | 98 | |
8af750e3 | 99 | /* OMAP_RTC_IRQWAKEEN bit fields: */ |
92adb96a | 100 | #define OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN BIT(1) |
8af750e3 | 101 | |
cab1458c AM |
102 | /* OMAP_RTC_KICKER values */ |
103 | #define KICK0_VALUE 0x83e70b13 | |
104 | #define KICK1_VALUE 0x95a4f1e0 | |
105 | ||
92adb96a | 106 | #define OMAP_RTC_HAS_KICKER BIT(0) |
cab1458c | 107 | |
8af750e3 HG |
108 | /* |
109 | * Few RTC IP revisions has special WAKE-EN Register to enable Wakeup | |
110 | * generation for event Alarm. | |
111 | */ | |
92adb96a | 112 | #define OMAP_RTC_HAS_IRQWAKEEN BIT(1) |
8af750e3 | 113 | |
8cfde8c1 | 114 | static void __iomem *rtc_base; |
db68b189 | 115 | |
cab1458c AM |
116 | #define rtc_read(addr) readb(rtc_base + (addr)) |
117 | #define rtc_write(val, addr) writeb(val, rtc_base + (addr)) | |
118 | ||
119 | #define rtc_writel(val, addr) writel(val, rtc_base + (addr)) | |
db68b189 DB |
120 | |
121 | ||
db68b189 DB |
122 | /* we rely on the rtc framework to handle locking (rtc->ops_lock), |
123 | * so the only other requirement is that register accesses which | |
124 | * require BUSY to be clear are made with IRQs locally disabled | |
125 | */ | |
126 | static void rtc_wait_not_busy(void) | |
127 | { | |
128 | int count = 0; | |
129 | u8 status; | |
130 | ||
131 | /* BUSY may stay active for 1/32768 second (~30 usec) */ | |
132 | for (count = 0; count < 50; count++) { | |
133 | status = rtc_read(OMAP_RTC_STATUS_REG); | |
134 | if ((status & (u8)OMAP_RTC_STATUS_BUSY) == 0) | |
135 | break; | |
136 | udelay(1); | |
137 | } | |
138 | /* now we have ~15 usec to read/write various registers */ | |
139 | } | |
140 | ||
ab6a2d70 | 141 | static irqreturn_t rtc_irq(int irq, void *rtc) |
db68b189 DB |
142 | { |
143 | unsigned long events = 0; | |
144 | u8 irq_data; | |
145 | ||
146 | irq_data = rtc_read(OMAP_RTC_STATUS_REG); | |
147 | ||
148 | /* alarm irq? */ | |
149 | if (irq_data & OMAP_RTC_STATUS_ALARM) { | |
150 | rtc_write(OMAP_RTC_STATUS_ALARM, OMAP_RTC_STATUS_REG); | |
151 | events |= RTC_IRQF | RTC_AF; | |
152 | } | |
153 | ||
154 | /* 1/sec periodic/update irq? */ | |
155 | if (irq_data & OMAP_RTC_STATUS_1S_EVENT) | |
156 | events |= RTC_IRQF | RTC_UF; | |
157 | ||
ab6a2d70 | 158 | rtc_update_irq(rtc, 1, events); |
db68b189 DB |
159 | |
160 | return IRQ_HANDLED; | |
161 | } | |
162 | ||
16380c15 JS |
163 | static int omap_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) |
164 | { | |
165 | u8 reg; | |
166 | ||
167 | local_irq_disable(); | |
168 | rtc_wait_not_busy(); | |
169 | reg = rtc_read(OMAP_RTC_INTERRUPTS_REG); | |
170 | if (enabled) | |
171 | reg |= OMAP_RTC_INTERRUPTS_IT_ALARM; | |
172 | else | |
173 | reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM; | |
174 | rtc_wait_not_busy(); | |
175 | rtc_write(reg, OMAP_RTC_INTERRUPTS_REG); | |
176 | local_irq_enable(); | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
db68b189 DB |
181 | /* this hardware doesn't support "don't care" alarm fields */ |
182 | static int tm2bcd(struct rtc_time *tm) | |
183 | { | |
184 | if (rtc_valid_tm(tm) != 0) | |
185 | return -EINVAL; | |
186 | ||
fe20ba70 AB |
187 | tm->tm_sec = bin2bcd(tm->tm_sec); |
188 | tm->tm_min = bin2bcd(tm->tm_min); | |
189 | tm->tm_hour = bin2bcd(tm->tm_hour); | |
190 | tm->tm_mday = bin2bcd(tm->tm_mday); | |
db68b189 | 191 | |
fe20ba70 | 192 | tm->tm_mon = bin2bcd(tm->tm_mon + 1); |
db68b189 DB |
193 | |
194 | /* epoch == 1900 */ | |
195 | if (tm->tm_year < 100 || tm->tm_year > 199) | |
196 | return -EINVAL; | |
fe20ba70 | 197 | tm->tm_year = bin2bcd(tm->tm_year - 100); |
db68b189 DB |
198 | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static void bcd2tm(struct rtc_time *tm) | |
203 | { | |
fe20ba70 AB |
204 | tm->tm_sec = bcd2bin(tm->tm_sec); |
205 | tm->tm_min = bcd2bin(tm->tm_min); | |
206 | tm->tm_hour = bcd2bin(tm->tm_hour); | |
207 | tm->tm_mday = bcd2bin(tm->tm_mday); | |
208 | tm->tm_mon = bcd2bin(tm->tm_mon) - 1; | |
db68b189 | 209 | /* epoch == 1900 */ |
fe20ba70 | 210 | tm->tm_year = bcd2bin(tm->tm_year) + 100; |
db68b189 DB |
211 | } |
212 | ||
213 | ||
214 | static int omap_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
215 | { | |
216 | /* we don't report wday/yday/isdst ... */ | |
217 | local_irq_disable(); | |
218 | rtc_wait_not_busy(); | |
219 | ||
220 | tm->tm_sec = rtc_read(OMAP_RTC_SECONDS_REG); | |
221 | tm->tm_min = rtc_read(OMAP_RTC_MINUTES_REG); | |
222 | tm->tm_hour = rtc_read(OMAP_RTC_HOURS_REG); | |
223 | tm->tm_mday = rtc_read(OMAP_RTC_DAYS_REG); | |
224 | tm->tm_mon = rtc_read(OMAP_RTC_MONTHS_REG); | |
225 | tm->tm_year = rtc_read(OMAP_RTC_YEARS_REG); | |
226 | ||
227 | local_irq_enable(); | |
228 | ||
229 | bcd2tm(tm); | |
230 | return 0; | |
231 | } | |
232 | ||
233 | static int omap_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
234 | { | |
235 | if (tm2bcd(tm) < 0) | |
236 | return -EINVAL; | |
237 | local_irq_disable(); | |
238 | rtc_wait_not_busy(); | |
239 | ||
240 | rtc_write(tm->tm_year, OMAP_RTC_YEARS_REG); | |
241 | rtc_write(tm->tm_mon, OMAP_RTC_MONTHS_REG); | |
242 | rtc_write(tm->tm_mday, OMAP_RTC_DAYS_REG); | |
243 | rtc_write(tm->tm_hour, OMAP_RTC_HOURS_REG); | |
244 | rtc_write(tm->tm_min, OMAP_RTC_MINUTES_REG); | |
245 | rtc_write(tm->tm_sec, OMAP_RTC_SECONDS_REG); | |
246 | ||
247 | local_irq_enable(); | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
252 | static int omap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
253 | { | |
254 | local_irq_disable(); | |
255 | rtc_wait_not_busy(); | |
256 | ||
257 | alm->time.tm_sec = rtc_read(OMAP_RTC_ALARM_SECONDS_REG); | |
258 | alm->time.tm_min = rtc_read(OMAP_RTC_ALARM_MINUTES_REG); | |
259 | alm->time.tm_hour = rtc_read(OMAP_RTC_ALARM_HOURS_REG); | |
260 | alm->time.tm_mday = rtc_read(OMAP_RTC_ALARM_DAYS_REG); | |
261 | alm->time.tm_mon = rtc_read(OMAP_RTC_ALARM_MONTHS_REG); | |
262 | alm->time.tm_year = rtc_read(OMAP_RTC_ALARM_YEARS_REG); | |
263 | ||
264 | local_irq_enable(); | |
265 | ||
266 | bcd2tm(&alm->time); | |
a2db8dfc | 267 | alm->enabled = !!(rtc_read(OMAP_RTC_INTERRUPTS_REG) |
db68b189 | 268 | & OMAP_RTC_INTERRUPTS_IT_ALARM); |
db68b189 DB |
269 | |
270 | return 0; | |
271 | } | |
272 | ||
273 | static int omap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
274 | { | |
275 | u8 reg; | |
276 | ||
db68b189 DB |
277 | if (tm2bcd(&alm->time) < 0) |
278 | return -EINVAL; | |
279 | ||
280 | local_irq_disable(); | |
281 | rtc_wait_not_busy(); | |
282 | ||
283 | rtc_write(alm->time.tm_year, OMAP_RTC_ALARM_YEARS_REG); | |
284 | rtc_write(alm->time.tm_mon, OMAP_RTC_ALARM_MONTHS_REG); | |
285 | rtc_write(alm->time.tm_mday, OMAP_RTC_ALARM_DAYS_REG); | |
286 | rtc_write(alm->time.tm_hour, OMAP_RTC_ALARM_HOURS_REG); | |
287 | rtc_write(alm->time.tm_min, OMAP_RTC_ALARM_MINUTES_REG); | |
288 | rtc_write(alm->time.tm_sec, OMAP_RTC_ALARM_SECONDS_REG); | |
289 | ||
290 | reg = rtc_read(OMAP_RTC_INTERRUPTS_REG); | |
291 | if (alm->enabled) | |
292 | reg |= OMAP_RTC_INTERRUPTS_IT_ALARM; | |
293 | else | |
294 | reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM; | |
295 | rtc_write(reg, OMAP_RTC_INTERRUPTS_REG); | |
296 | ||
297 | local_irq_enable(); | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
302 | static struct rtc_class_ops omap_rtc_ops = { | |
db68b189 DB |
303 | .read_time = omap_rtc_read_time, |
304 | .set_time = omap_rtc_set_time, | |
305 | .read_alarm = omap_rtc_read_alarm, | |
306 | .set_alarm = omap_rtc_set_alarm, | |
16380c15 | 307 | .alarm_irq_enable = omap_rtc_alarm_irq_enable, |
db68b189 DB |
308 | }; |
309 | ||
310 | static int omap_rtc_alarm; | |
311 | static int omap_rtc_timer; | |
312 | ||
8af750e3 HG |
313 | #define OMAP_RTC_DATA_AM3352_IDX 1 |
314 | #define OMAP_RTC_DATA_DA830_IDX 2 | |
9e0344dc | 315 | |
cab1458c AM |
316 | static struct platform_device_id omap_rtc_devtype[] = { |
317 | { | |
318 | .name = DRIVER_NAME, | |
8af750e3 HG |
319 | }, |
320 | [OMAP_RTC_DATA_AM3352_IDX] = { | |
321 | .name = "am3352-rtc", | |
322 | .driver_data = OMAP_RTC_HAS_KICKER | OMAP_RTC_HAS_IRQWAKEEN, | |
323 | }, | |
324 | [OMAP_RTC_DATA_DA830_IDX] = { | |
cab1458c AM |
325 | .name = "da830-rtc", |
326 | .driver_data = OMAP_RTC_HAS_KICKER, | |
327 | }, | |
328 | {}, | |
329 | }; | |
330 | MODULE_DEVICE_TABLE(platform, omap_rtc_devtype); | |
331 | ||
9e0344dc AM |
332 | static const struct of_device_id omap_rtc_of_match[] = { |
333 | { .compatible = "ti,da830-rtc", | |
334 | .data = &omap_rtc_devtype[OMAP_RTC_DATA_DA830_IDX], | |
335 | }, | |
8af750e3 HG |
336 | { .compatible = "ti,am3352-rtc", |
337 | .data = &omap_rtc_devtype[OMAP_RTC_DATA_AM3352_IDX], | |
338 | }, | |
9e0344dc AM |
339 | {}, |
340 | }; | |
341 | MODULE_DEVICE_TABLE(of, omap_rtc_of_match); | |
342 | ||
71fc8224 | 343 | static int __init omap_rtc_probe(struct platform_device *pdev) |
db68b189 | 344 | { |
3765e8f1 | 345 | struct resource *res; |
db68b189 DB |
346 | struct rtc_device *rtc; |
347 | u8 reg, new_ctrl; | |
cab1458c | 348 | const struct platform_device_id *id_entry; |
9e0344dc AM |
349 | const struct of_device_id *of_id; |
350 | ||
351 | of_id = of_match_device(omap_rtc_of_match, &pdev->dev); | |
352 | if (of_id) | |
353 | pdev->id_entry = of_id->data; | |
db68b189 | 354 | |
337b600f SN |
355 | id_entry = platform_get_device_id(pdev); |
356 | if (!id_entry) { | |
357 | dev_err(&pdev->dev, "no matching device entry\n"); | |
358 | return -ENODEV; | |
359 | } | |
360 | ||
db68b189 DB |
361 | omap_rtc_timer = platform_get_irq(pdev, 0); |
362 | if (omap_rtc_timer <= 0) { | |
363 | pr_debug("%s: no update irq?\n", pdev->name); | |
364 | return -ENOENT; | |
365 | } | |
366 | ||
367 | omap_rtc_alarm = platform_get_irq(pdev, 1); | |
368 | if (omap_rtc_alarm <= 0) { | |
369 | pr_debug("%s: no alarm irq?\n", pdev->name); | |
370 | return -ENOENT; | |
371 | } | |
372 | ||
db68b189 | 373 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
3765e8f1 VBM |
374 | rtc_base = devm_ioremap_resource(&pdev->dev, res); |
375 | if (IS_ERR(rtc_base)) | |
376 | return PTR_ERR(rtc_base); | |
8cfde8c1 | 377 | |
fc9bd902 VH |
378 | /* Enable the clock/module so that we can access the registers */ |
379 | pm_runtime_enable(&pdev->dev); | |
380 | pm_runtime_get_sync(&pdev->dev); | |
381 | ||
337b600f | 382 | if (id_entry->driver_data & OMAP_RTC_HAS_KICKER) { |
cab1458c AM |
383 | rtc_writel(KICK0_VALUE, OMAP_RTC_KICK0_REG); |
384 | rtc_writel(KICK1_VALUE, OMAP_RTC_KICK1_REG); | |
385 | } | |
386 | ||
3765e8f1 | 387 | rtc = devm_rtc_device_register(&pdev->dev, pdev->name, |
db68b189 DB |
388 | &omap_rtc_ops, THIS_MODULE); |
389 | if (IS_ERR(rtc)) { | |
390 | pr_debug("%s: can't register RTC device, err %ld\n", | |
391 | pdev->name, PTR_ERR(rtc)); | |
8cfde8c1 | 392 | goto fail0; |
db68b189 DB |
393 | } |
394 | platform_set_drvdata(pdev, rtc); | |
db68b189 DB |
395 | |
396 | /* clear pending irqs, and set 1/second periodic, | |
397 | * which we'll use instead of update irqs | |
398 | */ | |
399 | rtc_write(0, OMAP_RTC_INTERRUPTS_REG); | |
400 | ||
401 | /* clear old status */ | |
402 | reg = rtc_read(OMAP_RTC_STATUS_REG); | |
403 | if (reg & (u8) OMAP_RTC_STATUS_POWER_UP) { | |
404 | pr_info("%s: RTC power up reset detected\n", | |
405 | pdev->name); | |
406 | rtc_write(OMAP_RTC_STATUS_POWER_UP, OMAP_RTC_STATUS_REG); | |
407 | } | |
408 | if (reg & (u8) OMAP_RTC_STATUS_ALARM) | |
409 | rtc_write(OMAP_RTC_STATUS_ALARM, OMAP_RTC_STATUS_REG); | |
410 | ||
411 | /* handle periodic and alarm irqs */ | |
3765e8f1 | 412 | if (devm_request_irq(&pdev->dev, omap_rtc_timer, rtc_irq, 0, |
744bcb13 | 413 | dev_name(&rtc->dev), rtc)) { |
db68b189 DB |
414 | pr_debug("%s: RTC timer interrupt IRQ%d already claimed\n", |
415 | pdev->name, omap_rtc_timer); | |
3765e8f1 | 416 | goto fail0; |
db68b189 | 417 | } |
8cfde8c1 | 418 | if ((omap_rtc_timer != omap_rtc_alarm) && |
3765e8f1 | 419 | (devm_request_irq(&pdev->dev, omap_rtc_alarm, rtc_irq, 0, |
8cfde8c1 | 420 | dev_name(&rtc->dev), rtc))) { |
db68b189 DB |
421 | pr_debug("%s: RTC alarm interrupt IRQ%d already claimed\n", |
422 | pdev->name, omap_rtc_alarm); | |
3765e8f1 | 423 | goto fail0; |
db68b189 DB |
424 | } |
425 | ||
426 | /* On boards with split power, RTC_ON_NOFF won't reset the RTC */ | |
427 | reg = rtc_read(OMAP_RTC_CTRL_REG); | |
428 | if (reg & (u8) OMAP_RTC_CTRL_STOP) | |
429 | pr_info("%s: already running\n", pdev->name); | |
430 | ||
431 | /* force to 24 hour mode */ | |
12b3e038 | 432 | new_ctrl = reg & (OMAP_RTC_CTRL_SPLIT|OMAP_RTC_CTRL_AUTO_COMP); |
db68b189 DB |
433 | new_ctrl |= OMAP_RTC_CTRL_STOP; |
434 | ||
435 | /* BOARD-SPECIFIC CUSTOMIZATION CAN GO HERE: | |
436 | * | |
fa5b0782 SN |
437 | * - Device wake-up capability setting should come through chip |
438 | * init logic. OMAP1 boards should initialize the "wakeup capable" | |
439 | * flag in the platform device if the board is wired right for | |
440 | * being woken up by RTC alarm. For OMAP-L138, this capability | |
441 | * is built into the SoC by the "Deep Sleep" capability. | |
db68b189 DB |
442 | * |
443 | * - Boards wired so RTC_ON_nOFF is used as the reset signal, | |
444 | * rather than nPWRON_RESET, should forcibly enable split | |
445 | * power mode. (Some chip errata report that RTC_CTRL_SPLIT | |
446 | * is write-only, and always reads as zero...) | |
447 | */ | |
db68b189 | 448 | |
1d2e2b65 HG |
449 | device_init_wakeup(&pdev->dev, true); |
450 | ||
db68b189 DB |
451 | if (new_ctrl & (u8) OMAP_RTC_CTRL_SPLIT) |
452 | pr_info("%s: split power mode\n", pdev->name); | |
453 | ||
454 | if (reg != new_ctrl) | |
455 | rtc_write(new_ctrl, OMAP_RTC_CTRL_REG); | |
456 | ||
457 | return 0; | |
458 | ||
8cfde8c1 | 459 | fail0: |
337b600f | 460 | if (id_entry->driver_data & OMAP_RTC_HAS_KICKER) |
cab1458c | 461 | rtc_writel(0, OMAP_RTC_KICK0_REG); |
fc9bd902 VH |
462 | pm_runtime_put_sync(&pdev->dev); |
463 | pm_runtime_disable(&pdev->dev); | |
db68b189 DB |
464 | return -EIO; |
465 | } | |
466 | ||
71fc8224 | 467 | static int __exit omap_rtc_remove(struct platform_device *pdev) |
db68b189 | 468 | { |
cab1458c AM |
469 | const struct platform_device_id *id_entry = |
470 | platform_get_device_id(pdev); | |
db68b189 DB |
471 | |
472 | device_init_wakeup(&pdev->dev, 0); | |
473 | ||
474 | /* leave rtc running, but disable irqs */ | |
475 | rtc_write(0, OMAP_RTC_INTERRUPTS_REG); | |
476 | ||
337b600f | 477 | if (id_entry->driver_data & OMAP_RTC_HAS_KICKER) |
cab1458c | 478 | rtc_writel(0, OMAP_RTC_KICK0_REG); |
fc9bd902 VH |
479 | |
480 | /* Disable the clock/module */ | |
481 | pm_runtime_put_sync(&pdev->dev); | |
482 | pm_runtime_disable(&pdev->dev); | |
483 | ||
db68b189 DB |
484 | return 0; |
485 | } | |
486 | ||
04ebc359 | 487 | #ifdef CONFIG_PM_SLEEP |
db68b189 DB |
488 | static u8 irqstat; |
489 | ||
04ebc359 | 490 | static int omap_rtc_suspend(struct device *dev) |
db68b189 | 491 | { |
8af750e3 HG |
492 | u8 irqwake_stat; |
493 | struct platform_device *pdev = to_platform_device(dev); | |
494 | const struct platform_device_id *id_entry = | |
495 | platform_get_device_id(pdev); | |
496 | ||
db68b189 DB |
497 | irqstat = rtc_read(OMAP_RTC_INTERRUPTS_REG); |
498 | ||
499 | /* FIXME the RTC alarm is not currently acting as a wakeup event | |
8af750e3 HG |
500 | * source on some platforms, and in fact this enable() call is just |
501 | * saving a flag that's never used... | |
db68b189 | 502 | */ |
8af750e3 | 503 | if (device_may_wakeup(dev)) { |
db68b189 | 504 | enable_irq_wake(omap_rtc_alarm); |
8af750e3 HG |
505 | |
506 | if (id_entry->driver_data & OMAP_RTC_HAS_IRQWAKEEN) { | |
507 | irqwake_stat = rtc_read(OMAP_RTC_IRQWAKEEN); | |
508 | irqwake_stat |= OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN; | |
509 | rtc_write(irqwake_stat, OMAP_RTC_IRQWAKEEN); | |
510 | } | |
511 | } else { | |
db68b189 | 512 | rtc_write(0, OMAP_RTC_INTERRUPTS_REG); |
8af750e3 | 513 | } |
db68b189 | 514 | |
fc9bd902 | 515 | /* Disable the clock/module */ |
04ebc359 | 516 | pm_runtime_put_sync(dev); |
fc9bd902 | 517 | |
db68b189 DB |
518 | return 0; |
519 | } | |
520 | ||
04ebc359 | 521 | static int omap_rtc_resume(struct device *dev) |
db68b189 | 522 | { |
8af750e3 HG |
523 | u8 irqwake_stat; |
524 | struct platform_device *pdev = to_platform_device(dev); | |
525 | const struct platform_device_id *id_entry = | |
526 | platform_get_device_id(pdev); | |
527 | ||
fc9bd902 | 528 | /* Enable the clock/module so that we can access the registers */ |
04ebc359 | 529 | pm_runtime_get_sync(dev); |
fc9bd902 | 530 | |
8af750e3 | 531 | if (device_may_wakeup(dev)) { |
db68b189 | 532 | disable_irq_wake(omap_rtc_alarm); |
8af750e3 HG |
533 | |
534 | if (id_entry->driver_data & OMAP_RTC_HAS_IRQWAKEEN) { | |
535 | irqwake_stat = rtc_read(OMAP_RTC_IRQWAKEEN); | |
536 | irqwake_stat &= ~OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN; | |
537 | rtc_write(irqwake_stat, OMAP_RTC_IRQWAKEEN); | |
538 | } | |
539 | } else { | |
db68b189 | 540 | rtc_write(irqstat, OMAP_RTC_INTERRUPTS_REG); |
8af750e3 | 541 | } |
db68b189 DB |
542 | return 0; |
543 | } | |
db68b189 DB |
544 | #endif |
545 | ||
04ebc359 JH |
546 | static SIMPLE_DEV_PM_OPS(omap_rtc_pm_ops, omap_rtc_suspend, omap_rtc_resume); |
547 | ||
db68b189 DB |
548 | static void omap_rtc_shutdown(struct platform_device *pdev) |
549 | { | |
550 | rtc_write(0, OMAP_RTC_INTERRUPTS_REG); | |
551 | } | |
552 | ||
ad28a07b | 553 | MODULE_ALIAS("platform:omap_rtc"); |
db68b189 | 554 | static struct platform_driver omap_rtc_driver = { |
71fc8224 | 555 | .remove = __exit_p(omap_rtc_remove), |
db68b189 DB |
556 | .shutdown = omap_rtc_shutdown, |
557 | .driver = { | |
cab1458c | 558 | .name = DRIVER_NAME, |
db68b189 | 559 | .owner = THIS_MODULE, |
04ebc359 | 560 | .pm = &omap_rtc_pm_ops, |
616b7341 | 561 | .of_match_table = omap_rtc_of_match, |
db68b189 | 562 | }, |
cab1458c | 563 | .id_table = omap_rtc_devtype, |
db68b189 DB |
564 | }; |
565 | ||
09c5a36b | 566 | module_platform_driver_probe(omap_rtc_driver, omap_rtc_probe); |
db68b189 DB |
567 | |
568 | MODULE_AUTHOR("George G. Davis (and others)"); | |
569 | MODULE_LICENSE("GPL"); |