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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> | |
db68b189 DB |
25 | |
26 | ||
27 | /* The OMAP1 RTC is a year/month/day/hours/minutes/seconds BCD clock | |
28 | * with century-range alarm matching, driven by the 32kHz clock. | |
29 | * | |
30 | * The main user-visible ways it differs from PC RTCs are by omitting | |
31 | * "don't care" alarm fields and sub-second periodic IRQs, and having | |
32 | * an autoadjust mechanism to calibrate to the true oscillator rate. | |
33 | * | |
34 | * Board-specific wiring options include using split power mode with | |
35 | * RTC_OFF_NOFF used as the reset signal (so the RTC won't be reset), | |
36 | * and wiring RTC_WAKE_INT (so the RTC alarm can wake the system from | |
fa5b0782 SN |
37 | * low power modes) for OMAP1 boards (OMAP-L138 has this built into |
38 | * the SoC). See the BOARD-SPECIFIC CUSTOMIZATION comment. | |
db68b189 DB |
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 | ||
8cfde8c1 | 91 | static void __iomem *rtc_base; |
db68b189 | 92 | |
8cfde8c1 MG |
93 | #define rtc_read(addr) __raw_readb(rtc_base + (addr)) |
94 | #define rtc_write(val, addr) __raw_writeb(val, rtc_base + (addr)) | |
db68b189 DB |
95 | |
96 | ||
db68b189 DB |
97 | /* we rely on the rtc framework to handle locking (rtc->ops_lock), |
98 | * so the only other requirement is that register accesses which | |
99 | * require BUSY to be clear are made with IRQs locally disabled | |
100 | */ | |
101 | static void rtc_wait_not_busy(void) | |
102 | { | |
103 | int count = 0; | |
104 | u8 status; | |
105 | ||
106 | /* BUSY may stay active for 1/32768 second (~30 usec) */ | |
107 | for (count = 0; count < 50; count++) { | |
108 | status = rtc_read(OMAP_RTC_STATUS_REG); | |
109 | if ((status & (u8)OMAP_RTC_STATUS_BUSY) == 0) | |
110 | break; | |
111 | udelay(1); | |
112 | } | |
113 | /* now we have ~15 usec to read/write various registers */ | |
114 | } | |
115 | ||
ab6a2d70 | 116 | static irqreturn_t rtc_irq(int irq, void *rtc) |
db68b189 DB |
117 | { |
118 | unsigned long events = 0; | |
119 | u8 irq_data; | |
120 | ||
121 | irq_data = rtc_read(OMAP_RTC_STATUS_REG); | |
122 | ||
123 | /* alarm irq? */ | |
124 | if (irq_data & OMAP_RTC_STATUS_ALARM) { | |
125 | rtc_write(OMAP_RTC_STATUS_ALARM, OMAP_RTC_STATUS_REG); | |
126 | events |= RTC_IRQF | RTC_AF; | |
127 | } | |
128 | ||
129 | /* 1/sec periodic/update irq? */ | |
130 | if (irq_data & OMAP_RTC_STATUS_1S_EVENT) | |
131 | events |= RTC_IRQF | RTC_UF; | |
132 | ||
ab6a2d70 | 133 | rtc_update_irq(rtc, 1, events); |
db68b189 DB |
134 | |
135 | return IRQ_HANDLED; | |
136 | } | |
137 | ||
138 | #ifdef CONFIG_RTC_INTF_DEV | |
139 | ||
140 | static int | |
141 | omap_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) | |
142 | { | |
143 | u8 reg; | |
144 | ||
145 | switch (cmd) { | |
146 | case RTC_AIE_OFF: | |
147 | case RTC_AIE_ON: | |
148 | case RTC_UIE_OFF: | |
149 | case RTC_UIE_ON: | |
150 | break; | |
151 | default: | |
152 | return -ENOIOCTLCMD; | |
153 | } | |
154 | ||
155 | local_irq_disable(); | |
156 | rtc_wait_not_busy(); | |
157 | reg = rtc_read(OMAP_RTC_INTERRUPTS_REG); | |
158 | switch (cmd) { | |
159 | /* AIE = Alarm Interrupt Enable */ | |
160 | case RTC_AIE_OFF: | |
161 | reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM; | |
162 | break; | |
163 | case RTC_AIE_ON: | |
164 | reg |= OMAP_RTC_INTERRUPTS_IT_ALARM; | |
165 | break; | |
166 | /* UIE = Update Interrupt Enable (1/second) */ | |
167 | case RTC_UIE_OFF: | |
168 | reg &= ~OMAP_RTC_INTERRUPTS_IT_TIMER; | |
169 | break; | |
170 | case RTC_UIE_ON: | |
171 | reg |= OMAP_RTC_INTERRUPTS_IT_TIMER; | |
172 | break; | |
173 | } | |
174 | rtc_wait_not_busy(); | |
175 | rtc_write(reg, OMAP_RTC_INTERRUPTS_REG); | |
176 | local_irq_enable(); | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | #else | |
182 | #define omap_rtc_ioctl NULL | |
183 | #endif | |
184 | ||
185 | /* this hardware doesn't support "don't care" alarm fields */ | |
186 | static int tm2bcd(struct rtc_time *tm) | |
187 | { | |
188 | if (rtc_valid_tm(tm) != 0) | |
189 | return -EINVAL; | |
190 | ||
fe20ba70 AB |
191 | tm->tm_sec = bin2bcd(tm->tm_sec); |
192 | tm->tm_min = bin2bcd(tm->tm_min); | |
193 | tm->tm_hour = bin2bcd(tm->tm_hour); | |
194 | tm->tm_mday = bin2bcd(tm->tm_mday); | |
db68b189 | 195 | |
fe20ba70 | 196 | tm->tm_mon = bin2bcd(tm->tm_mon + 1); |
db68b189 DB |
197 | |
198 | /* epoch == 1900 */ | |
199 | if (tm->tm_year < 100 || tm->tm_year > 199) | |
200 | return -EINVAL; | |
fe20ba70 | 201 | tm->tm_year = bin2bcd(tm->tm_year - 100); |
db68b189 DB |
202 | |
203 | return 0; | |
204 | } | |
205 | ||
206 | static void bcd2tm(struct rtc_time *tm) | |
207 | { | |
fe20ba70 AB |
208 | tm->tm_sec = bcd2bin(tm->tm_sec); |
209 | tm->tm_min = bcd2bin(tm->tm_min); | |
210 | tm->tm_hour = bcd2bin(tm->tm_hour); | |
211 | tm->tm_mday = bcd2bin(tm->tm_mday); | |
212 | tm->tm_mon = bcd2bin(tm->tm_mon) - 1; | |
db68b189 | 213 | /* epoch == 1900 */ |
fe20ba70 | 214 | tm->tm_year = bcd2bin(tm->tm_year) + 100; |
db68b189 DB |
215 | } |
216 | ||
217 | ||
218 | static int omap_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
219 | { | |
220 | /* we don't report wday/yday/isdst ... */ | |
221 | local_irq_disable(); | |
222 | rtc_wait_not_busy(); | |
223 | ||
224 | tm->tm_sec = rtc_read(OMAP_RTC_SECONDS_REG); | |
225 | tm->tm_min = rtc_read(OMAP_RTC_MINUTES_REG); | |
226 | tm->tm_hour = rtc_read(OMAP_RTC_HOURS_REG); | |
227 | tm->tm_mday = rtc_read(OMAP_RTC_DAYS_REG); | |
228 | tm->tm_mon = rtc_read(OMAP_RTC_MONTHS_REG); | |
229 | tm->tm_year = rtc_read(OMAP_RTC_YEARS_REG); | |
230 | ||
231 | local_irq_enable(); | |
232 | ||
233 | bcd2tm(tm); | |
234 | return 0; | |
235 | } | |
236 | ||
237 | static int omap_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
238 | { | |
239 | if (tm2bcd(tm) < 0) | |
240 | return -EINVAL; | |
241 | local_irq_disable(); | |
242 | rtc_wait_not_busy(); | |
243 | ||
244 | rtc_write(tm->tm_year, OMAP_RTC_YEARS_REG); | |
245 | rtc_write(tm->tm_mon, OMAP_RTC_MONTHS_REG); | |
246 | rtc_write(tm->tm_mday, OMAP_RTC_DAYS_REG); | |
247 | rtc_write(tm->tm_hour, OMAP_RTC_HOURS_REG); | |
248 | rtc_write(tm->tm_min, OMAP_RTC_MINUTES_REG); | |
249 | rtc_write(tm->tm_sec, OMAP_RTC_SECONDS_REG); | |
250 | ||
251 | local_irq_enable(); | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | static int omap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
257 | { | |
258 | local_irq_disable(); | |
259 | rtc_wait_not_busy(); | |
260 | ||
261 | alm->time.tm_sec = rtc_read(OMAP_RTC_ALARM_SECONDS_REG); | |
262 | alm->time.tm_min = rtc_read(OMAP_RTC_ALARM_MINUTES_REG); | |
263 | alm->time.tm_hour = rtc_read(OMAP_RTC_ALARM_HOURS_REG); | |
264 | alm->time.tm_mday = rtc_read(OMAP_RTC_ALARM_DAYS_REG); | |
265 | alm->time.tm_mon = rtc_read(OMAP_RTC_ALARM_MONTHS_REG); | |
266 | alm->time.tm_year = rtc_read(OMAP_RTC_ALARM_YEARS_REG); | |
267 | ||
268 | local_irq_enable(); | |
269 | ||
270 | bcd2tm(&alm->time); | |
a2db8dfc | 271 | alm->enabled = !!(rtc_read(OMAP_RTC_INTERRUPTS_REG) |
db68b189 | 272 | & OMAP_RTC_INTERRUPTS_IT_ALARM); |
db68b189 DB |
273 | |
274 | return 0; | |
275 | } | |
276 | ||
277 | static int omap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
278 | { | |
279 | u8 reg; | |
280 | ||
db68b189 DB |
281 | if (tm2bcd(&alm->time) < 0) |
282 | return -EINVAL; | |
283 | ||
284 | local_irq_disable(); | |
285 | rtc_wait_not_busy(); | |
286 | ||
287 | rtc_write(alm->time.tm_year, OMAP_RTC_ALARM_YEARS_REG); | |
288 | rtc_write(alm->time.tm_mon, OMAP_RTC_ALARM_MONTHS_REG); | |
289 | rtc_write(alm->time.tm_mday, OMAP_RTC_ALARM_DAYS_REG); | |
290 | rtc_write(alm->time.tm_hour, OMAP_RTC_ALARM_HOURS_REG); | |
291 | rtc_write(alm->time.tm_min, OMAP_RTC_ALARM_MINUTES_REG); | |
292 | rtc_write(alm->time.tm_sec, OMAP_RTC_ALARM_SECONDS_REG); | |
293 | ||
294 | reg = rtc_read(OMAP_RTC_INTERRUPTS_REG); | |
295 | if (alm->enabled) | |
296 | reg |= OMAP_RTC_INTERRUPTS_IT_ALARM; | |
297 | else | |
298 | reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM; | |
299 | rtc_write(reg, OMAP_RTC_INTERRUPTS_REG); | |
300 | ||
301 | local_irq_enable(); | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | static struct rtc_class_ops omap_rtc_ops = { | |
307 | .ioctl = omap_rtc_ioctl, | |
308 | .read_time = omap_rtc_read_time, | |
309 | .set_time = omap_rtc_set_time, | |
310 | .read_alarm = omap_rtc_read_alarm, | |
311 | .set_alarm = omap_rtc_set_alarm, | |
312 | }; | |
313 | ||
314 | static int omap_rtc_alarm; | |
315 | static int omap_rtc_timer; | |
316 | ||
71fc8224 | 317 | static int __init omap_rtc_probe(struct platform_device *pdev) |
db68b189 DB |
318 | { |
319 | struct resource *res, *mem; | |
320 | struct rtc_device *rtc; | |
321 | u8 reg, new_ctrl; | |
322 | ||
323 | omap_rtc_timer = platform_get_irq(pdev, 0); | |
324 | if (omap_rtc_timer <= 0) { | |
325 | pr_debug("%s: no update irq?\n", pdev->name); | |
326 | return -ENOENT; | |
327 | } | |
328 | ||
329 | omap_rtc_alarm = platform_get_irq(pdev, 1); | |
330 | if (omap_rtc_alarm <= 0) { | |
331 | pr_debug("%s: no alarm irq?\n", pdev->name); | |
332 | return -ENOENT; | |
333 | } | |
334 | ||
db68b189 | 335 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
8cfde8c1 MG |
336 | if (!res) { |
337 | pr_debug("%s: RTC resource data missing\n", pdev->name); | |
db68b189 DB |
338 | return -ENOENT; |
339 | } | |
340 | ||
8cfde8c1 | 341 | mem = request_mem_region(res->start, resource_size(res), pdev->name); |
db68b189 DB |
342 | if (!mem) { |
343 | pr_debug("%s: RTC registers at %08x are not free\n", | |
8cfde8c1 | 344 | pdev->name, res->start); |
db68b189 DB |
345 | return -EBUSY; |
346 | } | |
347 | ||
8cfde8c1 MG |
348 | rtc_base = ioremap(res->start, resource_size(res)); |
349 | if (!rtc_base) { | |
350 | pr_debug("%s: RTC registers can't be mapped\n", pdev->name); | |
351 | goto fail; | |
352 | } | |
353 | ||
db68b189 DB |
354 | rtc = rtc_device_register(pdev->name, &pdev->dev, |
355 | &omap_rtc_ops, THIS_MODULE); | |
356 | if (IS_ERR(rtc)) { | |
357 | pr_debug("%s: can't register RTC device, err %ld\n", | |
358 | pdev->name, PTR_ERR(rtc)); | |
8cfde8c1 | 359 | goto fail0; |
db68b189 DB |
360 | } |
361 | platform_set_drvdata(pdev, rtc); | |
558a40f7 | 362 | dev_set_drvdata(&rtc->dev, mem); |
db68b189 DB |
363 | |
364 | /* clear pending irqs, and set 1/second periodic, | |
365 | * which we'll use instead of update irqs | |
366 | */ | |
367 | rtc_write(0, OMAP_RTC_INTERRUPTS_REG); | |
368 | ||
369 | /* clear old status */ | |
370 | reg = rtc_read(OMAP_RTC_STATUS_REG); | |
371 | if (reg & (u8) OMAP_RTC_STATUS_POWER_UP) { | |
372 | pr_info("%s: RTC power up reset detected\n", | |
373 | pdev->name); | |
374 | rtc_write(OMAP_RTC_STATUS_POWER_UP, OMAP_RTC_STATUS_REG); | |
375 | } | |
376 | if (reg & (u8) OMAP_RTC_STATUS_ALARM) | |
377 | rtc_write(OMAP_RTC_STATUS_ALARM, OMAP_RTC_STATUS_REG); | |
378 | ||
379 | /* handle periodic and alarm irqs */ | |
38515e90 | 380 | if (request_irq(omap_rtc_timer, rtc_irq, IRQF_DISABLED, |
744bcb13 | 381 | dev_name(&rtc->dev), rtc)) { |
db68b189 DB |
382 | pr_debug("%s: RTC timer interrupt IRQ%d already claimed\n", |
383 | pdev->name, omap_rtc_timer); | |
8cfde8c1 | 384 | goto fail1; |
db68b189 | 385 | } |
8cfde8c1 MG |
386 | if ((omap_rtc_timer != omap_rtc_alarm) && |
387 | (request_irq(omap_rtc_alarm, rtc_irq, IRQF_DISABLED, | |
388 | dev_name(&rtc->dev), rtc))) { | |
db68b189 DB |
389 | pr_debug("%s: RTC alarm interrupt IRQ%d already claimed\n", |
390 | pdev->name, omap_rtc_alarm); | |
8cfde8c1 | 391 | goto fail2; |
db68b189 DB |
392 | } |
393 | ||
394 | /* On boards with split power, RTC_ON_NOFF won't reset the RTC */ | |
395 | reg = rtc_read(OMAP_RTC_CTRL_REG); | |
396 | if (reg & (u8) OMAP_RTC_CTRL_STOP) | |
397 | pr_info("%s: already running\n", pdev->name); | |
398 | ||
399 | /* force to 24 hour mode */ | |
400 | new_ctrl = reg & ~(OMAP_RTC_CTRL_SPLIT|OMAP_RTC_CTRL_AUTO_COMP); | |
401 | new_ctrl |= OMAP_RTC_CTRL_STOP; | |
402 | ||
403 | /* BOARD-SPECIFIC CUSTOMIZATION CAN GO HERE: | |
404 | * | |
fa5b0782 SN |
405 | * - Device wake-up capability setting should come through chip |
406 | * init logic. OMAP1 boards should initialize the "wakeup capable" | |
407 | * flag in the platform device if the board is wired right for | |
408 | * being woken up by RTC alarm. For OMAP-L138, this capability | |
409 | * is built into the SoC by the "Deep Sleep" capability. | |
db68b189 DB |
410 | * |
411 | * - Boards wired so RTC_ON_nOFF is used as the reset signal, | |
412 | * rather than nPWRON_RESET, should forcibly enable split | |
413 | * power mode. (Some chip errata report that RTC_CTRL_SPLIT | |
414 | * is write-only, and always reads as zero...) | |
415 | */ | |
db68b189 DB |
416 | |
417 | if (new_ctrl & (u8) OMAP_RTC_CTRL_SPLIT) | |
418 | pr_info("%s: split power mode\n", pdev->name); | |
419 | ||
420 | if (reg != new_ctrl) | |
421 | rtc_write(new_ctrl, OMAP_RTC_CTRL_REG); | |
422 | ||
423 | return 0; | |
424 | ||
8cfde8c1 | 425 | fail2: |
db68b189 | 426 | free_irq(omap_rtc_timer, NULL); |
8cfde8c1 | 427 | fail1: |
db68b189 | 428 | rtc_device_unregister(rtc); |
8cfde8c1 MG |
429 | fail0: |
430 | iounmap(rtc_base); | |
db68b189 DB |
431 | fail: |
432 | release_resource(mem); | |
433 | return -EIO; | |
434 | } | |
435 | ||
71fc8224 | 436 | static int __exit omap_rtc_remove(struct platform_device *pdev) |
db68b189 | 437 | { |
a419aef8 | 438 | struct rtc_device *rtc = platform_get_drvdata(pdev); |
db68b189 DB |
439 | |
440 | device_init_wakeup(&pdev->dev, 0); | |
441 | ||
442 | /* leave rtc running, but disable irqs */ | |
443 | rtc_write(0, OMAP_RTC_INTERRUPTS_REG); | |
444 | ||
445 | free_irq(omap_rtc_timer, rtc); | |
8cfde8c1 MG |
446 | |
447 | if (omap_rtc_timer != omap_rtc_alarm) | |
448 | free_irq(omap_rtc_alarm, rtc); | |
db68b189 | 449 | |
558a40f7 | 450 | release_resource(dev_get_drvdata(&rtc->dev)); |
db68b189 DB |
451 | rtc_device_unregister(rtc); |
452 | return 0; | |
453 | } | |
454 | ||
455 | #ifdef CONFIG_PM | |
456 | ||
db68b189 DB |
457 | static u8 irqstat; |
458 | ||
459 | static int omap_rtc_suspend(struct platform_device *pdev, pm_message_t state) | |
460 | { | |
db68b189 DB |
461 | irqstat = rtc_read(OMAP_RTC_INTERRUPTS_REG); |
462 | ||
463 | /* FIXME the RTC alarm is not currently acting as a wakeup event | |
464 | * source, and in fact this enable() call is just saving a flag | |
465 | * that's never used... | |
466 | */ | |
467 | if (device_may_wakeup(&pdev->dev)) | |
468 | enable_irq_wake(omap_rtc_alarm); | |
469 | else | |
470 | rtc_write(0, OMAP_RTC_INTERRUPTS_REG); | |
471 | ||
472 | return 0; | |
473 | } | |
474 | ||
475 | static int omap_rtc_resume(struct platform_device *pdev) | |
476 | { | |
db68b189 DB |
477 | if (device_may_wakeup(&pdev->dev)) |
478 | disable_irq_wake(omap_rtc_alarm); | |
479 | else | |
480 | rtc_write(irqstat, OMAP_RTC_INTERRUPTS_REG); | |
481 | return 0; | |
482 | } | |
483 | ||
484 | #else | |
485 | #define omap_rtc_suspend NULL | |
486 | #define omap_rtc_resume NULL | |
487 | #endif | |
488 | ||
489 | static void omap_rtc_shutdown(struct platform_device *pdev) | |
490 | { | |
491 | rtc_write(0, OMAP_RTC_INTERRUPTS_REG); | |
492 | } | |
493 | ||
ad28a07b | 494 | MODULE_ALIAS("platform:omap_rtc"); |
db68b189 | 495 | static struct platform_driver omap_rtc_driver = { |
71fc8224 | 496 | .remove = __exit_p(omap_rtc_remove), |
db68b189 DB |
497 | .suspend = omap_rtc_suspend, |
498 | .resume = omap_rtc_resume, | |
499 | .shutdown = omap_rtc_shutdown, | |
500 | .driver = { | |
501 | .name = "omap_rtc", | |
502 | .owner = THIS_MODULE, | |
503 | }, | |
504 | }; | |
505 | ||
506 | static int __init rtc_init(void) | |
507 | { | |
71fc8224 | 508 | return platform_driver_probe(&omap_rtc_driver, omap_rtc_probe); |
db68b189 DB |
509 | } |
510 | module_init(rtc_init); | |
511 | ||
512 | static void __exit rtc_exit(void) | |
513 | { | |
514 | platform_driver_unregister(&omap_rtc_driver); | |
515 | } | |
516 | module_exit(rtc_exit); | |
517 | ||
518 | MODULE_AUTHOR("George G. Davis (and others)"); | |
519 | MODULE_LICENSE("GPL"); |