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1add6781 BD |
1 | /* drivers/rtc/rtc-s3c.c |
2 | * | |
3 | * Copyright (c) 2004,2006 Simtec Electronics | |
4 | * Ben Dooks, <ben@simtec.co.uk> | |
5 | * http://armlinux.simtec.co.uk/ | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * S3C2410/S3C2440/S3C24XX Internal RTC Driver | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/string.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/rtc.h> | |
21 | #include <linux/bcd.h> | |
22 | #include <linux/clk.h> | |
23 | ||
24 | #include <asm/hardware.h> | |
25 | #include <asm/uaccess.h> | |
26 | #include <asm/io.h> | |
27 | #include <asm/irq.h> | |
28 | #include <asm/rtc.h> | |
29 | ||
30 | #include <asm/mach/time.h> | |
31 | ||
32 | #include <asm/arch/regs-rtc.h> | |
33 | ||
34 | /* I have yet to find an S3C implementation with more than one | |
35 | * of these rtc blocks in */ | |
36 | ||
37 | static struct resource *s3c_rtc_mem; | |
38 | ||
39 | static void __iomem *s3c_rtc_base; | |
40 | static int s3c_rtc_alarmno = NO_IRQ; | |
41 | static int s3c_rtc_tickno = NO_IRQ; | |
42 | static int s3c_rtc_freq = 1; | |
43 | ||
44 | static DEFINE_SPINLOCK(s3c_rtc_pie_lock); | |
45 | static unsigned int tick_count; | |
46 | ||
47 | /* IRQ Handlers */ | |
48 | ||
49 | static irqreturn_t s3c_rtc_alarmirq(int irq, void *id, struct pt_regs *r) | |
50 | { | |
51 | struct rtc_device *rdev = id; | |
52 | ||
53 | rtc_update_irq(&rdev->class_dev, 1, RTC_AF | RTC_IRQF); | |
54 | return IRQ_HANDLED; | |
55 | } | |
56 | ||
57 | static irqreturn_t s3c_rtc_tickirq(int irq, void *id, struct pt_regs *r) | |
58 | { | |
59 | struct rtc_device *rdev = id; | |
60 | ||
61 | rtc_update_irq(&rdev->class_dev, tick_count++, RTC_PF | RTC_IRQF); | |
62 | return IRQ_HANDLED; | |
63 | } | |
64 | ||
65 | /* Update control registers */ | |
66 | static void s3c_rtc_setaie(int to) | |
67 | { | |
68 | unsigned int tmp; | |
69 | ||
70 | pr_debug("%s: aie=%d\n", __FUNCTION__, to); | |
71 | ||
72 | tmp = readb(S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN; | |
73 | ||
74 | if (to) | |
75 | tmp |= S3C2410_RTCALM_ALMEN; | |
76 | ||
77 | writeb(tmp, S3C2410_RTCALM); | |
78 | } | |
79 | ||
80 | static void s3c_rtc_setpie(int to) | |
81 | { | |
82 | unsigned int tmp; | |
83 | ||
84 | pr_debug("%s: pie=%d\n", __FUNCTION__, to); | |
85 | ||
86 | spin_lock_irq(&s3c_rtc_pie_lock); | |
87 | tmp = readb(S3C2410_TICNT) & ~S3C2410_TICNT_ENABLE; | |
88 | ||
89 | if (to) | |
90 | tmp |= S3C2410_TICNT_ENABLE; | |
91 | ||
92 | writeb(tmp, S3C2410_TICNT); | |
93 | spin_unlock_irq(&s3c_rtc_pie_lock); | |
94 | } | |
95 | ||
96 | static void s3c_rtc_setfreq(int freq) | |
97 | { | |
98 | unsigned int tmp; | |
99 | ||
100 | spin_lock_irq(&s3c_rtc_pie_lock); | |
101 | tmp = readb(S3C2410_TICNT) & S3C2410_TICNT_ENABLE; | |
102 | ||
103 | s3c_rtc_freq = freq; | |
104 | ||
105 | tmp |= (128 / freq)-1; | |
106 | ||
107 | writeb(tmp, S3C2410_TICNT); | |
108 | spin_unlock_irq(&s3c_rtc_pie_lock); | |
109 | } | |
110 | ||
111 | /* Time read/write */ | |
112 | ||
113 | static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm) | |
114 | { | |
115 | unsigned int have_retried = 0; | |
116 | ||
117 | retry_get_time: | |
118 | rtc_tm->tm_min = readb(S3C2410_RTCMIN); | |
119 | rtc_tm->tm_hour = readb(S3C2410_RTCHOUR); | |
120 | rtc_tm->tm_mday = readb(S3C2410_RTCDATE); | |
121 | rtc_tm->tm_mon = readb(S3C2410_RTCMON); | |
122 | rtc_tm->tm_year = readb(S3C2410_RTCYEAR); | |
123 | rtc_tm->tm_sec = readb(S3C2410_RTCSEC); | |
124 | ||
125 | /* the only way to work out wether the system was mid-update | |
126 | * when we read it is to check the second counter, and if it | |
127 | * is zero, then we re-try the entire read | |
128 | */ | |
129 | ||
130 | if (rtc_tm->tm_sec == 0 && !have_retried) { | |
131 | have_retried = 1; | |
132 | goto retry_get_time; | |
133 | } | |
134 | ||
135 | pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n", | |
136 | rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday, | |
137 | rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec); | |
138 | ||
139 | BCD_TO_BIN(rtc_tm->tm_sec); | |
140 | BCD_TO_BIN(rtc_tm->tm_min); | |
141 | BCD_TO_BIN(rtc_tm->tm_hour); | |
142 | BCD_TO_BIN(rtc_tm->tm_mday); | |
143 | BCD_TO_BIN(rtc_tm->tm_mon); | |
144 | BCD_TO_BIN(rtc_tm->tm_year); | |
145 | ||
146 | rtc_tm->tm_year += 100; | |
147 | rtc_tm->tm_mon -= 1; | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm) | |
153 | { | |
154 | /* the rtc gets round the y2k problem by just not supporting it */ | |
155 | ||
156 | if (tm->tm_year < 100) | |
157 | return -EINVAL; | |
158 | ||
159 | writeb(BIN2BCD(tm->tm_sec), S3C2410_RTCSEC); | |
160 | writeb(BIN2BCD(tm->tm_min), S3C2410_RTCMIN); | |
161 | writeb(BIN2BCD(tm->tm_hour), S3C2410_RTCHOUR); | |
162 | writeb(BIN2BCD(tm->tm_mday), S3C2410_RTCDATE); | |
163 | writeb(BIN2BCD(tm->tm_mon + 1), S3C2410_RTCMON); | |
164 | writeb(BIN2BCD(tm->tm_year - 100), S3C2410_RTCYEAR); | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
169 | static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm) | |
170 | { | |
171 | struct rtc_time *alm_tm = &alrm->time; | |
172 | unsigned int alm_en; | |
173 | ||
174 | alm_tm->tm_sec = readb(S3C2410_ALMSEC); | |
175 | alm_tm->tm_min = readb(S3C2410_ALMMIN); | |
176 | alm_tm->tm_hour = readb(S3C2410_ALMHOUR); | |
177 | alm_tm->tm_mon = readb(S3C2410_ALMMON); | |
178 | alm_tm->tm_mday = readb(S3C2410_ALMDATE); | |
179 | alm_tm->tm_year = readb(S3C2410_ALMYEAR); | |
180 | ||
181 | alm_en = readb(S3C2410_RTCALM); | |
182 | ||
183 | pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n", | |
184 | alm_en, | |
185 | alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday, | |
186 | alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec); | |
187 | ||
188 | ||
189 | /* decode the alarm enable field */ | |
190 | ||
191 | if (alm_en & S3C2410_RTCALM_SECEN) | |
192 | BCD_TO_BIN(alm_tm->tm_sec); | |
193 | else | |
194 | alm_tm->tm_sec = 0xff; | |
195 | ||
196 | if (alm_en & S3C2410_RTCALM_MINEN) | |
197 | BCD_TO_BIN(alm_tm->tm_min); | |
198 | else | |
199 | alm_tm->tm_min = 0xff; | |
200 | ||
201 | if (alm_en & S3C2410_RTCALM_HOUREN) | |
202 | BCD_TO_BIN(alm_tm->tm_hour); | |
203 | else | |
204 | alm_tm->tm_hour = 0xff; | |
205 | ||
206 | if (alm_en & S3C2410_RTCALM_DAYEN) | |
207 | BCD_TO_BIN(alm_tm->tm_mday); | |
208 | else | |
209 | alm_tm->tm_mday = 0xff; | |
210 | ||
211 | if (alm_en & S3C2410_RTCALM_MONEN) { | |
212 | BCD_TO_BIN(alm_tm->tm_mon); | |
213 | alm_tm->tm_mon -= 1; | |
214 | } else { | |
215 | alm_tm->tm_mon = 0xff; | |
216 | } | |
217 | ||
218 | if (alm_en & S3C2410_RTCALM_YEAREN) | |
219 | BCD_TO_BIN(alm_tm->tm_year); | |
220 | else | |
221 | alm_tm->tm_year = 0xffff; | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) | |
227 | { | |
228 | struct rtc_time *tm = &alrm->time; | |
229 | unsigned int alrm_en; | |
230 | ||
231 | pr_debug("s3c_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n", | |
232 | alrm->enabled, | |
233 | tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff, | |
234 | tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec); | |
235 | ||
236 | ||
237 | alrm_en = readb(S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN; | |
238 | writeb(0x00, S3C2410_RTCALM); | |
239 | ||
240 | if (tm->tm_sec < 60 && tm->tm_sec >= 0) { | |
241 | alrm_en |= S3C2410_RTCALM_SECEN; | |
242 | writeb(BIN2BCD(tm->tm_sec), S3C2410_ALMSEC); | |
243 | } | |
244 | ||
245 | if (tm->tm_min < 60 && tm->tm_min >= 0) { | |
246 | alrm_en |= S3C2410_RTCALM_MINEN; | |
247 | writeb(BIN2BCD(tm->tm_min), S3C2410_ALMMIN); | |
248 | } | |
249 | ||
250 | if (tm->tm_hour < 24 && tm->tm_hour >= 0) { | |
251 | alrm_en |= S3C2410_RTCALM_HOUREN; | |
252 | writeb(BIN2BCD(tm->tm_hour), S3C2410_ALMHOUR); | |
253 | } | |
254 | ||
255 | pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en); | |
256 | ||
257 | writeb(alrm_en, S3C2410_RTCALM); | |
258 | ||
259 | if (0) { | |
260 | alrm_en = readb(S3C2410_RTCALM); | |
261 | alrm_en &= ~S3C2410_RTCALM_ALMEN; | |
262 | writeb(alrm_en, S3C2410_RTCALM); | |
263 | disable_irq_wake(s3c_rtc_alarmno); | |
264 | } | |
265 | ||
266 | if (alrm->enabled) | |
267 | enable_irq_wake(s3c_rtc_alarmno); | |
268 | else | |
269 | disable_irq_wake(s3c_rtc_alarmno); | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
274 | static int s3c_rtc_ioctl(struct device *dev, | |
275 | unsigned int cmd, unsigned long arg) | |
276 | { | |
277 | unsigned int ret = -ENOIOCTLCMD; | |
278 | ||
279 | switch (cmd) { | |
280 | case RTC_AIE_OFF: | |
281 | case RTC_AIE_ON: | |
282 | s3c_rtc_setaie((cmd == RTC_AIE_ON) ? 1 : 0); | |
283 | ret = 0; | |
284 | break; | |
285 | ||
286 | case RTC_PIE_OFF: | |
287 | case RTC_PIE_ON: | |
288 | tick_count = 0; | |
289 | s3c_rtc_setpie((cmd == RTC_PIE_ON) ? 1 : 0); | |
290 | ret = 0; | |
291 | break; | |
292 | ||
293 | case RTC_IRQP_READ: | |
294 | ret = put_user(s3c_rtc_freq, (unsigned long __user *)arg); | |
295 | break; | |
296 | ||
297 | case RTC_IRQP_SET: | |
298 | /* check for power of 2 */ | |
299 | ||
300 | if ((arg & (arg-1)) != 0 || arg < 1) { | |
301 | ret = -EINVAL; | |
302 | goto exit; | |
303 | } | |
304 | ||
305 | pr_debug("s3c2410_rtc: setting frequency %ld\n", arg); | |
306 | ||
307 | s3c_rtc_setfreq(arg); | |
308 | ret = 0; | |
309 | break; | |
310 | ||
311 | case RTC_UIE_ON: | |
312 | case RTC_UIE_OFF: | |
313 | ret = -EINVAL; | |
314 | } | |
315 | ||
316 | exit: | |
317 | return ret; | |
318 | } | |
319 | ||
320 | static int s3c_rtc_proc(struct device *dev, struct seq_file *seq) | |
321 | { | |
322 | unsigned int rtcalm = readb(S3C2410_RTCALM); | |
323 | unsigned int ticnt = readb (S3C2410_TICNT); | |
324 | ||
325 | seq_printf(seq, "alarm_IRQ\t: %s\n", | |
326 | (rtcalm & S3C2410_RTCALM_ALMEN) ? "yes" : "no" ); | |
327 | ||
328 | seq_printf(seq, "periodic_IRQ\t: %s\n", | |
329 | (ticnt & S3C2410_TICNT_ENABLE) ? "yes" : "no" ); | |
330 | ||
331 | seq_printf(seq, "periodic_freq\t: %d\n", s3c_rtc_freq); | |
332 | ||
333 | return 0; | |
334 | } | |
335 | ||
336 | static int s3c_rtc_open(struct device *dev) | |
337 | { | |
338 | struct platform_device *pdev = to_platform_device(dev); | |
339 | struct rtc_device *rtc_dev = platform_get_drvdata(pdev); | |
340 | int ret; | |
341 | ||
342 | ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq, | |
343 | SA_INTERRUPT, "s3c2410-rtc alarm", rtc_dev); | |
344 | ||
345 | if (ret) { | |
346 | dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret); | |
347 | return ret; | |
348 | } | |
349 | ||
350 | ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq, | |
351 | SA_INTERRUPT, "s3c2410-rtc tick", rtc_dev); | |
352 | ||
353 | if (ret) { | |
354 | dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret); | |
355 | goto tick_err; | |
356 | } | |
357 | ||
358 | return ret; | |
359 | ||
360 | tick_err: | |
361 | free_irq(s3c_rtc_alarmno, rtc_dev); | |
362 | return ret; | |
363 | } | |
364 | ||
365 | static void s3c_rtc_release(struct device *dev) | |
366 | { | |
367 | struct platform_device *pdev = to_platform_device(dev); | |
368 | struct rtc_device *rtc_dev = platform_get_drvdata(pdev); | |
369 | ||
370 | /* do not clear AIE here, it may be needed for wake */ | |
371 | ||
372 | s3c_rtc_setpie(0); | |
373 | free_irq(s3c_rtc_alarmno, rtc_dev); | |
374 | free_irq(s3c_rtc_tickno, rtc_dev); | |
375 | } | |
376 | ||
377 | static struct rtc_class_ops s3c_rtcops = { | |
378 | .open = s3c_rtc_open, | |
379 | .release = s3c_rtc_release, | |
380 | .ioctl = s3c_rtc_ioctl, | |
381 | .read_time = s3c_rtc_gettime, | |
382 | .set_time = s3c_rtc_settime, | |
383 | .read_alarm = s3c_rtc_getalarm, | |
384 | .set_alarm = s3c_rtc_setalarm, | |
385 | .proc = s3c_rtc_proc, | |
386 | }; | |
387 | ||
388 | static void s3c_rtc_enable(struct platform_device *pdev, int en) | |
389 | { | |
390 | unsigned int tmp; | |
391 | ||
392 | if (s3c_rtc_base == NULL) | |
393 | return; | |
394 | ||
395 | if (!en) { | |
396 | tmp = readb(S3C2410_RTCCON); | |
397 | writeb(tmp & ~S3C2410_RTCCON_RTCEN, S3C2410_RTCCON); | |
398 | ||
399 | tmp = readb(S3C2410_TICNT); | |
400 | writeb(tmp & ~S3C2410_TICNT_ENABLE, S3C2410_TICNT); | |
401 | } else { | |
402 | /* re-enable the device, and check it is ok */ | |
403 | ||
404 | if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0){ | |
405 | dev_info(&pdev->dev, "rtc disabled, re-enabling\n"); | |
406 | ||
407 | tmp = readb(S3C2410_RTCCON); | |
408 | writeb(tmp | S3C2410_RTCCON_RTCEN , S3C2410_RTCCON); | |
409 | } | |
410 | ||
411 | if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)){ | |
412 | dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n"); | |
413 | ||
414 | tmp = readb(S3C2410_RTCCON); | |
415 | writeb(tmp& ~S3C2410_RTCCON_CNTSEL , S3C2410_RTCCON); | |
416 | } | |
417 | ||
418 | if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)){ | |
419 | dev_info(&pdev->dev, "removing RTCCON_CLKRST\n"); | |
420 | ||
421 | tmp = readb(S3C2410_RTCCON); | |
422 | writeb(tmp & ~S3C2410_RTCCON_CLKRST, S3C2410_RTCCON); | |
423 | } | |
424 | } | |
425 | } | |
426 | ||
427 | static int s3c_rtc_remove(struct platform_device *dev) | |
428 | { | |
429 | struct rtc_device *rtc = platform_get_drvdata(dev); | |
430 | ||
431 | platform_set_drvdata(dev, NULL); | |
432 | rtc_device_unregister(rtc); | |
433 | ||
434 | s3c_rtc_setpie(0); | |
435 | s3c_rtc_setaie(0); | |
436 | ||
437 | iounmap(s3c_rtc_base); | |
438 | release_resource(s3c_rtc_mem); | |
439 | kfree(s3c_rtc_mem); | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | static int s3c_rtc_probe(struct platform_device *pdev) | |
445 | { | |
446 | struct rtc_device *rtc; | |
447 | struct resource *res; | |
448 | int ret; | |
449 | ||
450 | pr_debug("%s: probe=%p\n", __FUNCTION__, pdev); | |
451 | ||
452 | /* find the IRQs */ | |
453 | ||
454 | s3c_rtc_tickno = platform_get_irq(pdev, 1); | |
455 | if (s3c_rtc_tickno < 0) { | |
456 | dev_err(&pdev->dev, "no irq for rtc tick\n"); | |
457 | return -ENOENT; | |
458 | } | |
459 | ||
460 | s3c_rtc_alarmno = platform_get_irq(pdev, 0); | |
461 | if (s3c_rtc_alarmno < 0) { | |
462 | dev_err(&pdev->dev, "no irq for alarm\n"); | |
463 | return -ENOENT; | |
464 | } | |
465 | ||
466 | pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n", | |
467 | s3c_rtc_tickno, s3c_rtc_alarmno); | |
468 | ||
469 | /* get the memory region */ | |
470 | ||
471 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
472 | if (res == NULL) { | |
473 | dev_err(&pdev->dev, "failed to get memory region resource\n"); | |
474 | return -ENOENT; | |
475 | } | |
476 | ||
477 | s3c_rtc_mem = request_mem_region(res->start, | |
478 | res->end-res->start+1, | |
479 | pdev->name); | |
480 | ||
481 | if (s3c_rtc_mem == NULL) { | |
482 | dev_err(&pdev->dev, "failed to reserve memory region\n"); | |
483 | ret = -ENOENT; | |
484 | goto err_nores; | |
485 | } | |
486 | ||
487 | s3c_rtc_base = ioremap(res->start, res->end - res->start + 1); | |
488 | if (s3c_rtc_base == NULL) { | |
489 | dev_err(&pdev->dev, "failed ioremap()\n"); | |
490 | ret = -EINVAL; | |
491 | goto err_nomap; | |
492 | } | |
493 | ||
494 | /* check to see if everything is setup correctly */ | |
495 | ||
496 | s3c_rtc_enable(pdev, 1); | |
497 | ||
498 | pr_debug("s3c2410_rtc: RTCCON=%02x\n", readb(S3C2410_RTCCON)); | |
499 | ||
500 | s3c_rtc_setfreq(s3c_rtc_freq); | |
501 | ||
502 | /* register RTC and exit */ | |
503 | ||
504 | rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops, | |
505 | THIS_MODULE); | |
506 | ||
507 | if (IS_ERR(rtc)) { | |
508 | dev_err(&pdev->dev, "cannot attach rtc\n"); | |
509 | ret = PTR_ERR(rtc); | |
510 | goto err_nortc; | |
511 | } | |
512 | ||
513 | rtc->max_user_freq = 128; | |
514 | ||
515 | platform_set_drvdata(pdev, rtc); | |
516 | return 0; | |
517 | ||
518 | err_nortc: | |
519 | s3c_rtc_enable(pdev, 0); | |
520 | iounmap(s3c_rtc_base); | |
521 | ||
522 | err_nomap: | |
523 | release_resource(s3c_rtc_mem); | |
524 | ||
525 | err_nores: | |
526 | return ret; | |
527 | } | |
528 | ||
529 | #ifdef CONFIG_PM | |
530 | ||
531 | /* RTC Power management control */ | |
532 | ||
533 | static struct timespec s3c_rtc_delta; | |
534 | ||
535 | static int ticnt_save; | |
536 | ||
537 | static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state) | |
538 | { | |
539 | struct rtc_time tm; | |
540 | struct timespec time; | |
541 | ||
542 | time.tv_nsec = 0; | |
543 | ||
544 | /* save TICNT for anyone using periodic interrupts */ | |
545 | ||
546 | ticnt_save = readb(S3C2410_TICNT); | |
547 | ||
548 | /* calculate time delta for suspend */ | |
549 | ||
550 | s3c_rtc_gettime(&pdev->dev, &tm); | |
551 | rtc_tm_to_time(&tm, &time.tv_sec); | |
552 | save_time_delta(&s3c_rtc_delta, &time); | |
553 | s3c_rtc_enable(pdev, 0); | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
558 | static int s3c_rtc_resume(struct platform_device *pdev) | |
559 | { | |
560 | struct rtc_time tm; | |
561 | struct timespec time; | |
562 | ||
563 | time.tv_nsec = 0; | |
564 | ||
565 | s3c_rtc_enable(pdev, 1); | |
566 | s3c_rtc_gettime(&pdev->dev, &tm); | |
567 | rtc_tm_to_time(&tm, &time.tv_sec); | |
568 | restore_time_delta(&s3c_rtc_delta, &time); | |
569 | ||
570 | writeb(ticnt_save, S3C2410_TICNT); | |
571 | return 0; | |
572 | } | |
573 | #else | |
574 | #define s3c_rtc_suspend NULL | |
575 | #define s3c_rtc_resume NULL | |
576 | #endif | |
577 | ||
578 | static struct platform_driver s3c2410_rtcdrv = { | |
579 | .probe = s3c_rtc_probe, | |
580 | .remove = s3c_rtc_remove, | |
581 | .suspend = s3c_rtc_suspend, | |
582 | .resume = s3c_rtc_resume, | |
583 | .driver = { | |
584 | .name = "s3c2410-rtc", | |
585 | .owner = THIS_MODULE, | |
586 | }, | |
587 | }; | |
588 | ||
589 | static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n"; | |
590 | ||
591 | static int __init s3c_rtc_init(void) | |
592 | { | |
593 | printk(banner); | |
594 | return platform_driver_register(&s3c2410_rtcdrv); | |
595 | } | |
596 | ||
597 | static void __exit s3c_rtc_exit(void) | |
598 | { | |
599 | platform_driver_unregister(&s3c2410_rtcdrv); | |
600 | } | |
601 | ||
602 | module_init(s3c_rtc_init); | |
603 | module_exit(s3c_rtc_exit); | |
604 | ||
605 | MODULE_DESCRIPTION("Samsung S3C RTC Driver"); | |
606 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); | |
607 | MODULE_LICENSE("GPL"); |