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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> | |
23 | ||
24 | #include <asm/io.h> | |
25 | #include <asm/mach/time.h> | |
26 | ||
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 | |
38 | * low power modes). See the BOARD-SPECIFIC CUSTOMIZATION comment. | |
39 | */ | |
40 | ||
41 | #define OMAP_RTC_BASE 0xfffb4800 | |
42 | ||
43 | /* RTC registers */ | |
44 | #define OMAP_RTC_SECONDS_REG 0x00 | |
45 | #define OMAP_RTC_MINUTES_REG 0x04 | |
46 | #define OMAP_RTC_HOURS_REG 0x08 | |
47 | #define OMAP_RTC_DAYS_REG 0x0C | |
48 | #define OMAP_RTC_MONTHS_REG 0x10 | |
49 | #define OMAP_RTC_YEARS_REG 0x14 | |
50 | #define OMAP_RTC_WEEKS_REG 0x18 | |
51 | ||
52 | #define OMAP_RTC_ALARM_SECONDS_REG 0x20 | |
53 | #define OMAP_RTC_ALARM_MINUTES_REG 0x24 | |
54 | #define OMAP_RTC_ALARM_HOURS_REG 0x28 | |
55 | #define OMAP_RTC_ALARM_DAYS_REG 0x2c | |
56 | #define OMAP_RTC_ALARM_MONTHS_REG 0x30 | |
57 | #define OMAP_RTC_ALARM_YEARS_REG 0x34 | |
58 | ||
59 | #define OMAP_RTC_CTRL_REG 0x40 | |
60 | #define OMAP_RTC_STATUS_REG 0x44 | |
61 | #define OMAP_RTC_INTERRUPTS_REG 0x48 | |
62 | ||
63 | #define OMAP_RTC_COMP_LSB_REG 0x4c | |
64 | #define OMAP_RTC_COMP_MSB_REG 0x50 | |
65 | #define OMAP_RTC_OSC_REG 0x54 | |
66 | ||
67 | /* OMAP_RTC_CTRL_REG bit fields: */ | |
68 | #define OMAP_RTC_CTRL_SPLIT (1<<7) | |
69 | #define OMAP_RTC_CTRL_DISABLE (1<<6) | |
70 | #define OMAP_RTC_CTRL_SET_32_COUNTER (1<<5) | |
71 | #define OMAP_RTC_CTRL_TEST (1<<4) | |
72 | #define OMAP_RTC_CTRL_MODE_12_24 (1<<3) | |
73 | #define OMAP_RTC_CTRL_AUTO_COMP (1<<2) | |
74 | #define OMAP_RTC_CTRL_ROUND_30S (1<<1) | |
75 | #define OMAP_RTC_CTRL_STOP (1<<0) | |
76 | ||
77 | /* OMAP_RTC_STATUS_REG bit fields: */ | |
78 | #define OMAP_RTC_STATUS_POWER_UP (1<<7) | |
79 | #define OMAP_RTC_STATUS_ALARM (1<<6) | |
80 | #define OMAP_RTC_STATUS_1D_EVENT (1<<5) | |
81 | #define OMAP_RTC_STATUS_1H_EVENT (1<<4) | |
82 | #define OMAP_RTC_STATUS_1M_EVENT (1<<3) | |
83 | #define OMAP_RTC_STATUS_1S_EVENT (1<<2) | |
84 | #define OMAP_RTC_STATUS_RUN (1<<1) | |
85 | #define OMAP_RTC_STATUS_BUSY (1<<0) | |
86 | ||
87 | /* OMAP_RTC_INTERRUPTS_REG bit fields: */ | |
88 | #define OMAP_RTC_INTERRUPTS_IT_ALARM (1<<3) | |
89 | #define OMAP_RTC_INTERRUPTS_IT_TIMER (1<<2) | |
90 | ||
91 | ||
92 | #define rtc_read(addr) omap_readb(OMAP_RTC_BASE + (addr)) | |
93 | #define rtc_write(val, addr) omap_writeb(val, OMAP_RTC_BASE + (addr)) | |
94 | ||
95 | ||
96 | /* platform_bus isn't hotpluggable, so for static linkage it'd be safe | |
97 | * to get rid of probe() and remove() code ... too bad the driver struct | |
98 | * remembers probe(), that's about 25% of the runtime footprint!! | |
99 | */ | |
100 | #ifndef MODULE | |
101 | #undef __devexit | |
102 | #undef __devexit_p | |
103 | #define __devexit __exit | |
104 | #define __devexit_p __exit_p | |
105 | #endif | |
106 | ||
107 | ||
108 | /* we rely on the rtc framework to handle locking (rtc->ops_lock), | |
109 | * so the only other requirement is that register accesses which | |
110 | * require BUSY to be clear are made with IRQs locally disabled | |
111 | */ | |
112 | static void rtc_wait_not_busy(void) | |
113 | { | |
114 | int count = 0; | |
115 | u8 status; | |
116 | ||
117 | /* BUSY may stay active for 1/32768 second (~30 usec) */ | |
118 | for (count = 0; count < 50; count++) { | |
119 | status = rtc_read(OMAP_RTC_STATUS_REG); | |
120 | if ((status & (u8)OMAP_RTC_STATUS_BUSY) == 0) | |
121 | break; | |
122 | udelay(1); | |
123 | } | |
124 | /* now we have ~15 usec to read/write various registers */ | |
125 | } | |
126 | ||
ab6a2d70 | 127 | static irqreturn_t rtc_irq(int irq, void *rtc) |
db68b189 DB |
128 | { |
129 | unsigned long events = 0; | |
130 | u8 irq_data; | |
131 | ||
132 | irq_data = rtc_read(OMAP_RTC_STATUS_REG); | |
133 | ||
134 | /* alarm irq? */ | |
135 | if (irq_data & OMAP_RTC_STATUS_ALARM) { | |
136 | rtc_write(OMAP_RTC_STATUS_ALARM, OMAP_RTC_STATUS_REG); | |
137 | events |= RTC_IRQF | RTC_AF; | |
138 | } | |
139 | ||
140 | /* 1/sec periodic/update irq? */ | |
141 | if (irq_data & OMAP_RTC_STATUS_1S_EVENT) | |
142 | events |= RTC_IRQF | RTC_UF; | |
143 | ||
ab6a2d70 | 144 | rtc_update_irq(rtc, 1, events); |
db68b189 DB |
145 | |
146 | return IRQ_HANDLED; | |
147 | } | |
148 | ||
149 | #ifdef CONFIG_RTC_INTF_DEV | |
150 | ||
151 | static int | |
152 | omap_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) | |
153 | { | |
154 | u8 reg; | |
155 | ||
156 | switch (cmd) { | |
157 | case RTC_AIE_OFF: | |
158 | case RTC_AIE_ON: | |
159 | case RTC_UIE_OFF: | |
160 | case RTC_UIE_ON: | |
161 | break; | |
162 | default: | |
163 | return -ENOIOCTLCMD; | |
164 | } | |
165 | ||
166 | local_irq_disable(); | |
167 | rtc_wait_not_busy(); | |
168 | reg = rtc_read(OMAP_RTC_INTERRUPTS_REG); | |
169 | switch (cmd) { | |
170 | /* AIE = Alarm Interrupt Enable */ | |
171 | case RTC_AIE_OFF: | |
172 | reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM; | |
173 | break; | |
174 | case RTC_AIE_ON: | |
175 | reg |= OMAP_RTC_INTERRUPTS_IT_ALARM; | |
176 | break; | |
177 | /* UIE = Update Interrupt Enable (1/second) */ | |
178 | case RTC_UIE_OFF: | |
179 | reg &= ~OMAP_RTC_INTERRUPTS_IT_TIMER; | |
180 | break; | |
181 | case RTC_UIE_ON: | |
182 | reg |= OMAP_RTC_INTERRUPTS_IT_TIMER; | |
183 | break; | |
184 | } | |
185 | rtc_wait_not_busy(); | |
186 | rtc_write(reg, OMAP_RTC_INTERRUPTS_REG); | |
187 | local_irq_enable(); | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
192 | #else | |
193 | #define omap_rtc_ioctl NULL | |
194 | #endif | |
195 | ||
196 | /* this hardware doesn't support "don't care" alarm fields */ | |
197 | static int tm2bcd(struct rtc_time *tm) | |
198 | { | |
199 | if (rtc_valid_tm(tm) != 0) | |
200 | return -EINVAL; | |
201 | ||
202 | tm->tm_sec = BIN2BCD(tm->tm_sec); | |
203 | tm->tm_min = BIN2BCD(tm->tm_min); | |
204 | tm->tm_hour = BIN2BCD(tm->tm_hour); | |
205 | tm->tm_mday = BIN2BCD(tm->tm_mday); | |
206 | ||
207 | tm->tm_mon = BIN2BCD(tm->tm_mon + 1); | |
208 | ||
209 | /* epoch == 1900 */ | |
210 | if (tm->tm_year < 100 || tm->tm_year > 199) | |
211 | return -EINVAL; | |
212 | tm->tm_year = BIN2BCD(tm->tm_year - 100); | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | static void bcd2tm(struct rtc_time *tm) | |
218 | { | |
219 | tm->tm_sec = BCD2BIN(tm->tm_sec); | |
220 | tm->tm_min = BCD2BIN(tm->tm_min); | |
221 | tm->tm_hour = BCD2BIN(tm->tm_hour); | |
222 | tm->tm_mday = BCD2BIN(tm->tm_mday); | |
223 | tm->tm_mon = BCD2BIN(tm->tm_mon) - 1; | |
224 | /* epoch == 1900 */ | |
225 | tm->tm_year = BCD2BIN(tm->tm_year) + 100; | |
226 | } | |
227 | ||
228 | ||
229 | static int omap_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
230 | { | |
231 | /* we don't report wday/yday/isdst ... */ | |
232 | local_irq_disable(); | |
233 | rtc_wait_not_busy(); | |
234 | ||
235 | tm->tm_sec = rtc_read(OMAP_RTC_SECONDS_REG); | |
236 | tm->tm_min = rtc_read(OMAP_RTC_MINUTES_REG); | |
237 | tm->tm_hour = rtc_read(OMAP_RTC_HOURS_REG); | |
238 | tm->tm_mday = rtc_read(OMAP_RTC_DAYS_REG); | |
239 | tm->tm_mon = rtc_read(OMAP_RTC_MONTHS_REG); | |
240 | tm->tm_year = rtc_read(OMAP_RTC_YEARS_REG); | |
241 | ||
242 | local_irq_enable(); | |
243 | ||
244 | bcd2tm(tm); | |
245 | return 0; | |
246 | } | |
247 | ||
248 | static int omap_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
249 | { | |
250 | if (tm2bcd(tm) < 0) | |
251 | return -EINVAL; | |
252 | local_irq_disable(); | |
253 | rtc_wait_not_busy(); | |
254 | ||
255 | rtc_write(tm->tm_year, OMAP_RTC_YEARS_REG); | |
256 | rtc_write(tm->tm_mon, OMAP_RTC_MONTHS_REG); | |
257 | rtc_write(tm->tm_mday, OMAP_RTC_DAYS_REG); | |
258 | rtc_write(tm->tm_hour, OMAP_RTC_HOURS_REG); | |
259 | rtc_write(tm->tm_min, OMAP_RTC_MINUTES_REG); | |
260 | rtc_write(tm->tm_sec, OMAP_RTC_SECONDS_REG); | |
261 | ||
262 | local_irq_enable(); | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
267 | static int omap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
268 | { | |
269 | local_irq_disable(); | |
270 | rtc_wait_not_busy(); | |
271 | ||
272 | alm->time.tm_sec = rtc_read(OMAP_RTC_ALARM_SECONDS_REG); | |
273 | alm->time.tm_min = rtc_read(OMAP_RTC_ALARM_MINUTES_REG); | |
274 | alm->time.tm_hour = rtc_read(OMAP_RTC_ALARM_HOURS_REG); | |
275 | alm->time.tm_mday = rtc_read(OMAP_RTC_ALARM_DAYS_REG); | |
276 | alm->time.tm_mon = rtc_read(OMAP_RTC_ALARM_MONTHS_REG); | |
277 | alm->time.tm_year = rtc_read(OMAP_RTC_ALARM_YEARS_REG); | |
278 | ||
279 | local_irq_enable(); | |
280 | ||
281 | bcd2tm(&alm->time); | |
a2db8dfc | 282 | alm->enabled = !!(rtc_read(OMAP_RTC_INTERRUPTS_REG) |
db68b189 | 283 | & OMAP_RTC_INTERRUPTS_IT_ALARM); |
db68b189 DB |
284 | |
285 | return 0; | |
286 | } | |
287 | ||
288 | static int omap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
289 | { | |
290 | u8 reg; | |
291 | ||
292 | /* Much userspace code uses RTC_ALM_SET, thus "don't care" for | |
293 | * day/month/year specifies alarms up to 24 hours in the future. | |
294 | * So we need to handle that ... but let's ignore the "don't care" | |
295 | * values for hours/minutes/seconds. | |
296 | */ | |
297 | if (alm->time.tm_mday <= 0 | |
298 | && alm->time.tm_mon < 0 | |
299 | && alm->time.tm_year < 0) { | |
300 | struct rtc_time tm; | |
301 | unsigned long now, then; | |
302 | ||
303 | omap_rtc_read_time(dev, &tm); | |
304 | rtc_tm_to_time(&tm, &now); | |
305 | ||
306 | alm->time.tm_mday = tm.tm_mday; | |
307 | alm->time.tm_mon = tm.tm_mon; | |
308 | alm->time.tm_year = tm.tm_year; | |
309 | rtc_tm_to_time(&alm->time, &then); | |
310 | ||
311 | /* sometimes the alarm wraps into tomorrow */ | |
312 | if (then < now) { | |
313 | rtc_time_to_tm(now + 24 * 60 * 60, &tm); | |
314 | alm->time.tm_mday = tm.tm_mday; | |
315 | alm->time.tm_mon = tm.tm_mon; | |
316 | alm->time.tm_year = tm.tm_year; | |
317 | } | |
318 | } | |
319 | ||
320 | if (tm2bcd(&alm->time) < 0) | |
321 | return -EINVAL; | |
322 | ||
323 | local_irq_disable(); | |
324 | rtc_wait_not_busy(); | |
325 | ||
326 | rtc_write(alm->time.tm_year, OMAP_RTC_ALARM_YEARS_REG); | |
327 | rtc_write(alm->time.tm_mon, OMAP_RTC_ALARM_MONTHS_REG); | |
328 | rtc_write(alm->time.tm_mday, OMAP_RTC_ALARM_DAYS_REG); | |
329 | rtc_write(alm->time.tm_hour, OMAP_RTC_ALARM_HOURS_REG); | |
330 | rtc_write(alm->time.tm_min, OMAP_RTC_ALARM_MINUTES_REG); | |
331 | rtc_write(alm->time.tm_sec, OMAP_RTC_ALARM_SECONDS_REG); | |
332 | ||
333 | reg = rtc_read(OMAP_RTC_INTERRUPTS_REG); | |
334 | if (alm->enabled) | |
335 | reg |= OMAP_RTC_INTERRUPTS_IT_ALARM; | |
336 | else | |
337 | reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM; | |
338 | rtc_write(reg, OMAP_RTC_INTERRUPTS_REG); | |
339 | ||
340 | local_irq_enable(); | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
345 | static struct rtc_class_ops omap_rtc_ops = { | |
346 | .ioctl = omap_rtc_ioctl, | |
347 | .read_time = omap_rtc_read_time, | |
348 | .set_time = omap_rtc_set_time, | |
349 | .read_alarm = omap_rtc_read_alarm, | |
350 | .set_alarm = omap_rtc_set_alarm, | |
351 | }; | |
352 | ||
353 | static int omap_rtc_alarm; | |
354 | static int omap_rtc_timer; | |
355 | ||
356 | static int __devinit omap_rtc_probe(struct platform_device *pdev) | |
357 | { | |
358 | struct resource *res, *mem; | |
359 | struct rtc_device *rtc; | |
360 | u8 reg, new_ctrl; | |
361 | ||
362 | omap_rtc_timer = platform_get_irq(pdev, 0); | |
363 | if (omap_rtc_timer <= 0) { | |
364 | pr_debug("%s: no update irq?\n", pdev->name); | |
365 | return -ENOENT; | |
366 | } | |
367 | ||
368 | omap_rtc_alarm = platform_get_irq(pdev, 1); | |
369 | if (omap_rtc_alarm <= 0) { | |
370 | pr_debug("%s: no alarm irq?\n", pdev->name); | |
371 | return -ENOENT; | |
372 | } | |
373 | ||
374 | /* NOTE: using static mapping for RTC registers */ | |
375 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
376 | if (res && res->start != OMAP_RTC_BASE) { | |
377 | pr_debug("%s: RTC registers at %08x, expected %08x\n", | |
378 | pdev->name, (unsigned) res->start, OMAP_RTC_BASE); | |
379 | return -ENOENT; | |
380 | } | |
381 | ||
382 | if (res) | |
383 | mem = request_mem_region(res->start, | |
384 | res->end - res->start + 1, | |
385 | pdev->name); | |
386 | else | |
387 | mem = NULL; | |
388 | if (!mem) { | |
389 | pr_debug("%s: RTC registers at %08x are not free\n", | |
390 | pdev->name, OMAP_RTC_BASE); | |
391 | return -EBUSY; | |
392 | } | |
393 | ||
394 | rtc = rtc_device_register(pdev->name, &pdev->dev, | |
395 | &omap_rtc_ops, THIS_MODULE); | |
396 | if (IS_ERR(rtc)) { | |
397 | pr_debug("%s: can't register RTC device, err %ld\n", | |
398 | pdev->name, PTR_ERR(rtc)); | |
399 | goto fail; | |
400 | } | |
401 | platform_set_drvdata(pdev, rtc); | |
402 | class_set_devdata(&rtc->class_dev, mem); | |
403 | ||
404 | /* clear pending irqs, and set 1/second periodic, | |
405 | * which we'll use instead of update irqs | |
406 | */ | |
407 | rtc_write(0, OMAP_RTC_INTERRUPTS_REG); | |
408 | ||
409 | /* clear old status */ | |
410 | reg = rtc_read(OMAP_RTC_STATUS_REG); | |
411 | if (reg & (u8) OMAP_RTC_STATUS_POWER_UP) { | |
412 | pr_info("%s: RTC power up reset detected\n", | |
413 | pdev->name); | |
414 | rtc_write(OMAP_RTC_STATUS_POWER_UP, OMAP_RTC_STATUS_REG); | |
415 | } | |
416 | if (reg & (u8) OMAP_RTC_STATUS_ALARM) | |
417 | rtc_write(OMAP_RTC_STATUS_ALARM, OMAP_RTC_STATUS_REG); | |
418 | ||
419 | /* handle periodic and alarm irqs */ | |
38515e90 | 420 | if (request_irq(omap_rtc_timer, rtc_irq, IRQF_DISABLED, |
db68b189 DB |
421 | rtc->class_dev.class_id, &rtc->class_dev)) { |
422 | pr_debug("%s: RTC timer interrupt IRQ%d already claimed\n", | |
423 | pdev->name, omap_rtc_timer); | |
424 | goto fail0; | |
425 | } | |
38515e90 | 426 | if (request_irq(omap_rtc_alarm, rtc_irq, IRQF_DISABLED, |
db68b189 DB |
427 | rtc->class_dev.class_id, &rtc->class_dev)) { |
428 | pr_debug("%s: RTC alarm interrupt IRQ%d already claimed\n", | |
429 | pdev->name, omap_rtc_alarm); | |
430 | goto fail1; | |
431 | } | |
432 | ||
433 | /* On boards with split power, RTC_ON_NOFF won't reset the RTC */ | |
434 | reg = rtc_read(OMAP_RTC_CTRL_REG); | |
435 | if (reg & (u8) OMAP_RTC_CTRL_STOP) | |
436 | pr_info("%s: already running\n", pdev->name); | |
437 | ||
438 | /* force to 24 hour mode */ | |
439 | new_ctrl = reg & ~(OMAP_RTC_CTRL_SPLIT|OMAP_RTC_CTRL_AUTO_COMP); | |
440 | new_ctrl |= OMAP_RTC_CTRL_STOP; | |
441 | ||
442 | /* BOARD-SPECIFIC CUSTOMIZATION CAN GO HERE: | |
443 | * | |
444 | * - Boards wired so that RTC_WAKE_INT does something, and muxed | |
445 | * right (W13_1610_RTC_WAKE_INT is the default after chip reset), | |
446 | * should initialize the device wakeup flag appropriately. | |
447 | * | |
448 | * - Boards wired so RTC_ON_nOFF is used as the reset signal, | |
449 | * rather than nPWRON_RESET, should forcibly enable split | |
450 | * power mode. (Some chip errata report that RTC_CTRL_SPLIT | |
451 | * is write-only, and always reads as zero...) | |
452 | */ | |
453 | device_init_wakeup(&pdev->dev, 0); | |
454 | ||
455 | if (new_ctrl & (u8) OMAP_RTC_CTRL_SPLIT) | |
456 | pr_info("%s: split power mode\n", pdev->name); | |
457 | ||
458 | if (reg != new_ctrl) | |
459 | rtc_write(new_ctrl, OMAP_RTC_CTRL_REG); | |
460 | ||
461 | return 0; | |
462 | ||
463 | fail1: | |
464 | free_irq(omap_rtc_timer, NULL); | |
465 | fail0: | |
466 | rtc_device_unregister(rtc); | |
467 | fail: | |
468 | release_resource(mem); | |
469 | return -EIO; | |
470 | } | |
471 | ||
472 | static int __devexit omap_rtc_remove(struct platform_device *pdev) | |
473 | { | |
474 | struct rtc_device *rtc = platform_get_drvdata(pdev);; | |
475 | ||
476 | device_init_wakeup(&pdev->dev, 0); | |
477 | ||
478 | /* leave rtc running, but disable irqs */ | |
479 | rtc_write(0, OMAP_RTC_INTERRUPTS_REG); | |
480 | ||
481 | free_irq(omap_rtc_timer, rtc); | |
482 | free_irq(omap_rtc_alarm, rtc); | |
483 | ||
484 | release_resource(class_get_devdata(&rtc->class_dev)); | |
485 | rtc_device_unregister(rtc); | |
486 | return 0; | |
487 | } | |
488 | ||
489 | #ifdef CONFIG_PM | |
490 | ||
491 | static struct timespec rtc_delta; | |
492 | static u8 irqstat; | |
493 | ||
494 | static int omap_rtc_suspend(struct platform_device *pdev, pm_message_t state) | |
495 | { | |
496 | struct rtc_time rtc_tm; | |
497 | struct timespec time; | |
498 | ||
499 | time.tv_nsec = 0; | |
500 | omap_rtc_read_time(NULL, &rtc_tm); | |
501 | rtc_tm_to_time(&rtc_tm, &time.tv_sec); | |
502 | ||
503 | save_time_delta(&rtc_delta, &time); | |
504 | irqstat = rtc_read(OMAP_RTC_INTERRUPTS_REG); | |
505 | ||
506 | /* FIXME the RTC alarm is not currently acting as a wakeup event | |
507 | * source, and in fact this enable() call is just saving a flag | |
508 | * that's never used... | |
509 | */ | |
510 | if (device_may_wakeup(&pdev->dev)) | |
511 | enable_irq_wake(omap_rtc_alarm); | |
512 | else | |
513 | rtc_write(0, OMAP_RTC_INTERRUPTS_REG); | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
518 | static int omap_rtc_resume(struct platform_device *pdev) | |
519 | { | |
520 | struct rtc_time rtc_tm; | |
521 | struct timespec time; | |
522 | ||
523 | time.tv_nsec = 0; | |
524 | omap_rtc_read_time(NULL, &rtc_tm); | |
525 | rtc_tm_to_time(&rtc_tm, &time.tv_sec); | |
526 | ||
527 | restore_time_delta(&rtc_delta, &time); | |
528 | if (device_may_wakeup(&pdev->dev)) | |
529 | disable_irq_wake(omap_rtc_alarm); | |
530 | else | |
531 | rtc_write(irqstat, OMAP_RTC_INTERRUPTS_REG); | |
532 | return 0; | |
533 | } | |
534 | ||
535 | #else | |
536 | #define omap_rtc_suspend NULL | |
537 | #define omap_rtc_resume NULL | |
538 | #endif | |
539 | ||
540 | static void omap_rtc_shutdown(struct platform_device *pdev) | |
541 | { | |
542 | rtc_write(0, OMAP_RTC_INTERRUPTS_REG); | |
543 | } | |
544 | ||
545 | MODULE_ALIAS("omap_rtc"); | |
546 | static struct platform_driver omap_rtc_driver = { | |
547 | .probe = omap_rtc_probe, | |
548 | .remove = __devexit_p(omap_rtc_remove), | |
549 | .suspend = omap_rtc_suspend, | |
550 | .resume = omap_rtc_resume, | |
551 | .shutdown = omap_rtc_shutdown, | |
552 | .driver = { | |
553 | .name = "omap_rtc", | |
554 | .owner = THIS_MODULE, | |
555 | }, | |
556 | }; | |
557 | ||
558 | static int __init rtc_init(void) | |
559 | { | |
560 | return platform_driver_register(&omap_rtc_driver); | |
561 | } | |
562 | module_init(rtc_init); | |
563 | ||
564 | static void __exit rtc_exit(void) | |
565 | { | |
566 | platform_driver_unregister(&omap_rtc_driver); | |
567 | } | |
568 | module_exit(rtc_exit); | |
569 | ||
570 | MODULE_AUTHOR("George G. Davis (and others)"); | |
571 | MODULE_LICENSE("GPL"); |