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[linux-2.6/kvm.git] / drivers / rtc / rtc-davinci.c
blob755e1fe914af46911bedf6897cb553240a0e0e3d
1 /*
2 * DaVinci Power Management and Real Time Clock Driver for TI platforms
3 *
4 * Copyright (C) 2009 Texas Instruments, Inc
5 *
6 * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22 #include <linux/kernel.h>
23 #include <linux/init.h>
24 #include <linux/module.h>
25 #include <linux/ioport.h>
26 #include <linux/delay.h>
27 #include <linux/spinlock.h>
28 #include <linux/rtc.h>
29 #include <linux/bcd.h>
30 #include <linux/platform_device.h>
31 #include <linux/io.h>
32 #include <linux/slab.h>
33
34 /*
35 * The DaVinci RTC is a simple RTC with the following
36 * Sec: 0 - 59 : BCD count
37 * Min: 0 - 59 : BCD count
38 * Hour: 0 - 23 : BCD count
39 * Day: 0 - 0x7FFF(32767) : Binary count ( Over 89 years )
40 */
41
42 /* PRTC interface registers */
43 #define DAVINCI_PRTCIF_PID 0x00
44 #define PRTCIF_CTLR 0x04
45 #define PRTCIF_LDATA 0x08
46 #define PRTCIF_UDATA 0x0C
47 #define PRTCIF_INTEN 0x10
48 #define PRTCIF_INTFLG 0x14
49
50 /* PRTCIF_CTLR bit fields */
51 #define PRTCIF_CTLR_BUSY BIT(31)
52 #define PRTCIF_CTLR_SIZE BIT(25)
53 #define PRTCIF_CTLR_DIR BIT(24)
54 #define PRTCIF_CTLR_BENU_MSB BIT(23)
55 #define PRTCIF_CTLR_BENU_3RD_BYTE BIT(22)
56 #define PRTCIF_CTLR_BENU_2ND_BYTE BIT(21)
57 #define PRTCIF_CTLR_BENU_LSB BIT(20)
58 #define PRTCIF_CTLR_BENU_MASK (0x00F00000)
59 #define PRTCIF_CTLR_BENL_MSB BIT(19)
60 #define PRTCIF_CTLR_BENL_3RD_BYTE BIT(18)
61 #define PRTCIF_CTLR_BENL_2ND_BYTE BIT(17)
62 #define PRTCIF_CTLR_BENL_LSB BIT(16)
63 #define PRTCIF_CTLR_BENL_MASK (0x000F0000)
64
65 /* PRTCIF_INTEN bit fields */
66 #define PRTCIF_INTEN_RTCSS BIT(1)
67 #define PRTCIF_INTEN_RTCIF BIT(0)
68 #define PRTCIF_INTEN_MASK (PRTCIF_INTEN_RTCSS \
69 | PRTCIF_INTEN_RTCIF)
70
71 /* PRTCIF_INTFLG bit fields */
72 #define PRTCIF_INTFLG_RTCSS BIT(1)
73 #define PRTCIF_INTFLG_RTCIF BIT(0)
74 #define PRTCIF_INTFLG_MASK (PRTCIF_INTFLG_RTCSS \
75 | PRTCIF_INTFLG_RTCIF)
76
77 /* PRTC subsystem registers */
78 #define PRTCSS_RTC_INTC_EXTENA1 (0x0C)
79 #define PRTCSS_RTC_CTRL (0x10)
80 #define PRTCSS_RTC_WDT (0x11)
81 #define PRTCSS_RTC_TMR0 (0x12)
82 #define PRTCSS_RTC_TMR1 (0x13)
83 #define PRTCSS_RTC_CCTRL (0x14)
84 #define PRTCSS_RTC_SEC (0x15)
85 #define PRTCSS_RTC_MIN (0x16)
86 #define PRTCSS_RTC_HOUR (0x17)
87 #define PRTCSS_RTC_DAY0 (0x18)
88 #define PRTCSS_RTC_DAY1 (0x19)
89 #define PRTCSS_RTC_AMIN (0x1A)
90 #define PRTCSS_RTC_AHOUR (0x1B)
91 #define PRTCSS_RTC_ADAY0 (0x1C)
92 #define PRTCSS_RTC_ADAY1 (0x1D)
93 #define PRTCSS_RTC_CLKC_CNT (0x20)
94
95 /* PRTCSS_RTC_INTC_EXTENA1 */
96 #define PRTCSS_RTC_INTC_EXTENA1_MASK (0x07)
97
98 /* PRTCSS_RTC_CTRL bit fields */
99 #define PRTCSS_RTC_CTRL_WDTBUS BIT(7)
100 #define PRTCSS_RTC_CTRL_WEN BIT(6)
101 #define PRTCSS_RTC_CTRL_WDRT BIT(5)
102 #define PRTCSS_RTC_CTRL_WDTFLG BIT(4)
103 #define PRTCSS_RTC_CTRL_TE BIT(3)
104 #define PRTCSS_RTC_CTRL_TIEN BIT(2)
105 #define PRTCSS_RTC_CTRL_TMRFLG BIT(1)
106 #define PRTCSS_RTC_CTRL_TMMD BIT(0)
107
108 /* PRTCSS_RTC_CCTRL bit fields */
109 #define PRTCSS_RTC_CCTRL_CALBUSY BIT(7)
110 #define PRTCSS_RTC_CCTRL_DAEN BIT(5)
111 #define PRTCSS_RTC_CCTRL_HAEN BIT(4)
112 #define PRTCSS_RTC_CCTRL_MAEN BIT(3)
113 #define PRTCSS_RTC_CCTRL_ALMFLG BIT(2)
114 #define PRTCSS_RTC_CCTRL_AIEN BIT(1)
115 #define PRTCSS_RTC_CCTRL_CAEN BIT(0)
116
117 static DEFINE_SPINLOCK(davinci_rtc_lock);
118
119 struct davinci_rtc {
120 struct rtc_device *rtc;
121 void __iomem *base;
122 resource_size_t pbase;
123 size_t base_size;
124 int irq;
125 };
126
127 static inline void rtcif_write(struct davinci_rtc *davinci_rtc,
128 u32 val, u32 addr)
129 {
130 writel(val, davinci_rtc->base + addr);
131 }
132
133 static inline u32 rtcif_read(struct davinci_rtc *davinci_rtc, u32 addr)
134 {
135 return readl(davinci_rtc->base + addr);
136 }
137
138 static inline void rtcif_wait(struct davinci_rtc *davinci_rtc)
139 {
140 while (rtcif_read(davinci_rtc, PRTCIF_CTLR) & PRTCIF_CTLR_BUSY)
141 cpu_relax();
142 }
143
144 static inline void rtcss_write(struct davinci_rtc *davinci_rtc,
145 unsigned long val, u8 addr)
146 {
147 rtcif_wait(davinci_rtc);
148
149 rtcif_write(davinci_rtc, PRTCIF_CTLR_BENL_LSB | addr, PRTCIF_CTLR);
150 rtcif_write(davinci_rtc, val, PRTCIF_LDATA);
151
152 rtcif_wait(davinci_rtc);
153 }
154
155 static inline u8 rtcss_read(struct davinci_rtc *davinci_rtc, u8 addr)
156 {
157 rtcif_wait(davinci_rtc);
158
159 rtcif_write(davinci_rtc, PRTCIF_CTLR_DIR | PRTCIF_CTLR_BENL_LSB | addr,
160 PRTCIF_CTLR);
161
162 rtcif_wait(davinci_rtc);
163
164 return rtcif_read(davinci_rtc, PRTCIF_LDATA);
165 }
166
167 static inline void davinci_rtcss_calendar_wait(struct davinci_rtc *davinci_rtc)
168 {
169 while (rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL) &
170 PRTCSS_RTC_CCTRL_CALBUSY)
171 cpu_relax();
172 }
173
174 static irqreturn_t davinci_rtc_interrupt(int irq, void *class_dev)
175 {
176 struct davinci_rtc *davinci_rtc = class_dev;
177 unsigned long events = 0;
178 u32 irq_flg;
179 u8 alm_irq, tmr_irq;
180 u8 rtc_ctrl, rtc_cctrl;
181 int ret = IRQ_NONE;
182
183 irq_flg = rtcif_read(davinci_rtc, PRTCIF_INTFLG) &
184 PRTCIF_INTFLG_RTCSS;
185
186 alm_irq = rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL) &
187 PRTCSS_RTC_CCTRL_ALMFLG;
188
189 tmr_irq = rtcss_read(davinci_rtc, PRTCSS_RTC_CTRL) &
190 PRTCSS_RTC_CTRL_TMRFLG;
191
192 if (irq_flg) {
193 if (alm_irq) {
194 events |= RTC_IRQF | RTC_AF;
195 rtc_cctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL);
196 rtc_cctrl |= PRTCSS_RTC_CCTRL_ALMFLG;
197 rtcss_write(davinci_rtc, rtc_cctrl, PRTCSS_RTC_CCTRL);
198 } else if (tmr_irq) {
199 events |= RTC_IRQF | RTC_PF;
200 rtc_ctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CTRL);
201 rtc_ctrl |= PRTCSS_RTC_CTRL_TMRFLG;
202 rtcss_write(davinci_rtc, rtc_ctrl, PRTCSS_RTC_CTRL);
203 }
204
205 rtcif_write(davinci_rtc, PRTCIF_INTFLG_RTCSS,
206 PRTCIF_INTFLG);
207 rtc_update_irq(davinci_rtc->rtc, 1, events);
208
209 ret = IRQ_HANDLED;
210 }
211
212 return ret;
213 }
214
215 static int
216 davinci_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
217 {
218 struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
219 u8 rtc_ctrl;
220 unsigned long flags;
221 int ret = 0;
222
223 spin_lock_irqsave(&davinci_rtc_lock, flags);
224
225 rtc_ctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CTRL);
226
227 switch (cmd) {
228 case RTC_WIE_ON:
229 rtc_ctrl |= PRTCSS_RTC_CTRL_WEN | PRTCSS_RTC_CTRL_WDTFLG;
230 break;
231 case RTC_WIE_OFF:
232 rtc_ctrl &= ~PRTCSS_RTC_CTRL_WEN;
233 break;
234 default:
235 ret = -ENOIOCTLCMD;
236 }
237
238 rtcss_write(davinci_rtc, rtc_ctrl, PRTCSS_RTC_CTRL);
239
240 spin_unlock_irqrestore(&davinci_rtc_lock, flags);
241
242 return ret;
243 }
244
245 static int convertfromdays(u16 days, struct rtc_time *tm)
246 {
247 int tmp_days, year, mon;
248
249 for (year = 2000;; year++) {
250 tmp_days = rtc_year_days(1, 12, year);
251 if (days >= tmp_days)
252 days -= tmp_days;
253 else {
254 for (mon = 0;; mon++) {
255 tmp_days = rtc_month_days(mon, year);
256 if (days >= tmp_days) {
257 days -= tmp_days;
258 } else {
259 tm->tm_year = year - 1900;
260 tm->tm_mon = mon;
261 tm->tm_mday = days + 1;
262 break;
263 }
264 }
265 break;
266 }
267 }
268 return 0;
269 }
270
271 static int convert2days(u16 *days, struct rtc_time *tm)
272 {
273 int i;
274 *days = 0;
275
276 /* epoch == 1900 */
277 if (tm->tm_year < 100 || tm->tm_year > 199)
278 return -EINVAL;
279
280 for (i = 2000; i < 1900 + tm->tm_year; i++)
281 *days += rtc_year_days(1, 12, i);
282
283 *days += rtc_year_days(tm->tm_mday, tm->tm_mon, 1900 + tm->tm_year);
284
285 return 0;
286 }
287
288 static int davinci_rtc_read_time(struct device *dev, struct rtc_time *tm)
289 {
290 struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
291 u16 days = 0;
292 u8 day0, day1;
293 unsigned long flags;
294
295 spin_lock_irqsave(&davinci_rtc_lock, flags);
296
297 davinci_rtcss_calendar_wait(davinci_rtc);
298 tm->tm_sec = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_SEC));
299
300 davinci_rtcss_calendar_wait(davinci_rtc);
301 tm->tm_min = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_MIN));
302
303 davinci_rtcss_calendar_wait(davinci_rtc);
304 tm->tm_hour = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_HOUR));
305
306 davinci_rtcss_calendar_wait(davinci_rtc);
307 day0 = rtcss_read(davinci_rtc, PRTCSS_RTC_DAY0);
308
309 davinci_rtcss_calendar_wait(davinci_rtc);
310 day1 = rtcss_read(davinci_rtc, PRTCSS_RTC_DAY1);
311
312 spin_unlock_irqrestore(&davinci_rtc_lock, flags);
313
314 days |= day1;
315 days <<= 8;
316 days |= day0;
317
318 if (convertfromdays(days, tm) < 0)
319 return -EINVAL;
320
321 return 0;
322 }
323
324 static int davinci_rtc_set_time(struct device *dev, struct rtc_time *tm)
325 {
326 struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
327 u16 days;
328 u8 rtc_cctrl;
329 unsigned long flags;
330
331 if (convert2days(&days, tm) < 0)
332 return -EINVAL;
333
334 spin_lock_irqsave(&davinci_rtc_lock, flags);
335
336 davinci_rtcss_calendar_wait(davinci_rtc);
337 rtcss_write(davinci_rtc, bin2bcd(tm->tm_sec), PRTCSS_RTC_SEC);
338
339 davinci_rtcss_calendar_wait(davinci_rtc);
340 rtcss_write(davinci_rtc, bin2bcd(tm->tm_min), PRTCSS_RTC_MIN);
341
342 davinci_rtcss_calendar_wait(davinci_rtc);
343 rtcss_write(davinci_rtc, bin2bcd(tm->tm_hour), PRTCSS_RTC_HOUR);
344
345 davinci_rtcss_calendar_wait(davinci_rtc);
346 rtcss_write(davinci_rtc, days & 0xFF, PRTCSS_RTC_DAY0);
347
348 davinci_rtcss_calendar_wait(davinci_rtc);
349 rtcss_write(davinci_rtc, (days & 0xFF00) >> 8, PRTCSS_RTC_DAY1);
350
351 rtc_cctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL);
352 rtc_cctrl |= PRTCSS_RTC_CCTRL_CAEN;
353 rtcss_write(davinci_rtc, rtc_cctrl, PRTCSS_RTC_CCTRL);
354
355 spin_unlock_irqrestore(&davinci_rtc_lock, flags);
356
357 return 0;
358 }
359
360 static int davinci_rtc_alarm_irq_enable(struct device *dev,
361 unsigned int enabled)
362 {
363 struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
364 unsigned long flags;
365 u8 rtc_cctrl = rtcss_read(davinci_rtc, PRTCSS_RTC_CCTRL);
366
367 spin_lock_irqsave(&davinci_rtc_lock, flags);
368
369 if (enabled)
370 rtc_cctrl |= PRTCSS_RTC_CCTRL_DAEN |
371 PRTCSS_RTC_CCTRL_HAEN |
372 PRTCSS_RTC_CCTRL_MAEN |
373 PRTCSS_RTC_CCTRL_ALMFLG |
374 PRTCSS_RTC_CCTRL_AIEN;
375 else
376 rtc_cctrl &= ~PRTCSS_RTC_CCTRL_AIEN;
377
378 davinci_rtcss_calendar_wait(davinci_rtc);
379 rtcss_write(davinci_rtc, rtc_cctrl, PRTCSS_RTC_CCTRL);
380
381 spin_unlock_irqrestore(&davinci_rtc_lock, flags);
382
383 return 0;
384 }
385
386 static int davinci_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
387 {
388 struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
389 u16 days = 0;
390 u8 day0, day1;
391 unsigned long flags;
392
393 spin_lock_irqsave(&davinci_rtc_lock, flags);
394
395 davinci_rtcss_calendar_wait(davinci_rtc);
396 alm->time.tm_min = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_AMIN));
397
398 davinci_rtcss_calendar_wait(davinci_rtc);
399 alm->time.tm_hour = bcd2bin(rtcss_read(davinci_rtc, PRTCSS_RTC_AHOUR));
400
401 davinci_rtcss_calendar_wait(davinci_rtc);
402 day0 = rtcss_read(davinci_rtc, PRTCSS_RTC_ADAY0);
403
404 davinci_rtcss_calendar_wait(davinci_rtc);
405 day1 = rtcss_read(davinci_rtc, PRTCSS_RTC_ADAY1);
406
407 spin_unlock_irqrestore(&davinci_rtc_lock, flags);
408 days |= day1;
409 days <<= 8;
410 days |= day0;
411
412 if (convertfromdays(days, &alm->time) < 0)
413 return -EINVAL;
414
415 alm->pending = !!(rtcss_read(davinci_rtc,
416 PRTCSS_RTC_CCTRL) &
417 PRTCSS_RTC_CCTRL_AIEN);
418 alm->enabled = alm->pending && device_may_wakeup(dev);
419
420 return 0;
421 }
422
423 static int davinci_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
424 {
425 struct davinci_rtc *davinci_rtc = dev_get_drvdata(dev);
426 unsigned long flags;
427 u16 days;
428
429 if (alm->time.tm_mday <= 0 && alm->time.tm_mon < 0
430 && alm->time.tm_year < 0) {
431 struct rtc_time tm;
432 unsigned long now, then;
433
434 davinci_rtc_read_time(dev, &tm);
435 rtc_tm_to_time(&tm, &now);
436
437 alm->time.tm_mday = tm.tm_mday;
438 alm->time.tm_mon = tm.tm_mon;
439 alm->time.tm_year = tm.tm_year;
440 rtc_tm_to_time(&alm->time, &then);
441
442 if (then < now) {
443 rtc_time_to_tm(now + 24 * 60 * 60, &tm);
444 alm->time.tm_mday = tm.tm_mday;
445 alm->time.tm_mon = tm.tm_mon;
446 alm->time.tm_year = tm.tm_year;
447 }
448 }
449
450 if (convert2days(&days, &alm->time) < 0)
451 return -EINVAL;
452
453 spin_lock_irqsave(&davinci_rtc_lock, flags);
454
455 davinci_rtcss_calendar_wait(davinci_rtc);
456 rtcss_write(davinci_rtc, bin2bcd(alm->time.tm_min), PRTCSS_RTC_AMIN);
457
458 davinci_rtcss_calendar_wait(davinci_rtc);
459 rtcss_write(davinci_rtc, bin2bcd(alm->time.tm_hour), PRTCSS_RTC_AHOUR);
460
461 davinci_rtcss_calendar_wait(davinci_rtc);
462 rtcss_write(davinci_rtc, days & 0xFF, PRTCSS_RTC_ADAY0);
463
464 davinci_rtcss_calendar_wait(davinci_rtc);
465 rtcss_write(davinci_rtc, (days & 0xFF00) >> 8, PRTCSS_RTC_ADAY1);
466
467 spin_unlock_irqrestore(&davinci_rtc_lock, flags);
468
469 return 0;
470 }
471
472 static struct rtc_class_ops davinci_rtc_ops = {
473 .ioctl = davinci_rtc_ioctl,
474 .read_time = davinci_rtc_read_time,
475 .set_time = davinci_rtc_set_time,
476 .alarm_irq_enable = davinci_rtc_alarm_irq_enable,
477 .read_alarm = davinci_rtc_read_alarm,
478 .set_alarm = davinci_rtc_set_alarm,
479 };
480
481 static int __init davinci_rtc_probe(struct platform_device *pdev)
482 {
483 struct device *dev = &pdev->dev;
484 struct davinci_rtc *davinci_rtc;
485 struct resource *res, *mem;
486 int ret = 0;
487
488 davinci_rtc = kzalloc(sizeof(struct davinci_rtc), GFP_KERNEL);
489 if (!davinci_rtc) {
490 dev_dbg(dev, "could not allocate memory for private data\n");
491 return -ENOMEM;
492 }
493
494 davinci_rtc->irq = platform_get_irq(pdev, 0);
495 if (davinci_rtc->irq < 0) {
496 dev_err(dev, "no RTC irq\n");
497 ret = davinci_rtc->irq;
498 goto fail1;
499 }
500
501 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
502 if (!res) {
503 dev_err(dev, "no mem resource\n");
504 ret = -EINVAL;
505 goto fail1;
506 }
507
508 davinci_rtc->pbase = res->start;
509 davinci_rtc->base_size = resource_size(res);
510
511 mem = request_mem_region(davinci_rtc->pbase, davinci_rtc->base_size,
512 pdev->name);
513 if (!mem) {
514 dev_err(dev, "RTC registers at %08x are not free\n",
515 davinci_rtc->pbase);
516 ret = -EBUSY;
517 goto fail1;
518 }
519
520 davinci_rtc->base = ioremap(davinci_rtc->pbase, davinci_rtc->base_size);
521 if (!davinci_rtc->base) {
522 dev_err(dev, "unable to ioremap MEM resource\n");
523 ret = -ENOMEM;
524 goto fail2;
525 }
526
527 platform_set_drvdata(pdev, davinci_rtc);
528
529 davinci_rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
530 &davinci_rtc_ops, THIS_MODULE);
531 if (IS_ERR(davinci_rtc->rtc)) {
532 dev_err(dev, "unable to register RTC device, err %ld\n",
533 PTR_ERR(davinci_rtc->rtc));
534 goto fail3;
535 }
536
537 rtcif_write(davinci_rtc, PRTCIF_INTFLG_RTCSS, PRTCIF_INTFLG);
538 rtcif_write(davinci_rtc, 0, PRTCIF_INTEN);
539 rtcss_write(davinci_rtc, 0, PRTCSS_RTC_INTC_EXTENA1);
540
541 rtcss_write(davinci_rtc, 0, PRTCSS_RTC_CTRL);
542 rtcss_write(davinci_rtc, 0, PRTCSS_RTC_CCTRL);
543
544 ret = request_irq(davinci_rtc->irq, davinci_rtc_interrupt,
545 IRQF_DISABLED, "davinci_rtc", davinci_rtc);
546 if (ret < 0) {
547 dev_err(dev, "unable to register davinci RTC interrupt\n");
548 goto fail4;
549 }
550
551 /* Enable interrupts */
552 rtcif_write(davinci_rtc, PRTCIF_INTEN_RTCSS, PRTCIF_INTEN);
553 rtcss_write(davinci_rtc, PRTCSS_RTC_INTC_EXTENA1_MASK,
554 PRTCSS_RTC_INTC_EXTENA1);
555
556 rtcss_write(davinci_rtc, PRTCSS_RTC_CCTRL_CAEN, PRTCSS_RTC_CCTRL);
557
558 device_init_wakeup(&pdev->dev, 0);
559
560 return 0;
561
562 fail4:
563 rtc_device_unregister(davinci_rtc->rtc);
564 fail3:
565 platform_set_drvdata(pdev, NULL);
566 iounmap(davinci_rtc->base);
567 fail2:
568 release_mem_region(davinci_rtc->pbase, davinci_rtc->base_size);
569 fail1:
570 kfree(davinci_rtc);
571
572 return ret;
573 }
574
575 static int __devexit davinci_rtc_remove(struct platform_device *pdev)
576 {
577 struct davinci_rtc *davinci_rtc = platform_get_drvdata(pdev);
578
579 device_init_wakeup(&pdev->dev, 0);
580
581 rtcif_write(davinci_rtc, 0, PRTCIF_INTEN);
582
583 free_irq(davinci_rtc->irq, davinci_rtc);
584
585 rtc_device_unregister(davinci_rtc->rtc);
586
587 iounmap(davinci_rtc->base);
588 release_mem_region(davinci_rtc->pbase, davinci_rtc->base_size);
589
590 platform_set_drvdata(pdev, NULL);
591
592 kfree(davinci_rtc);
593
594 return 0;
595 }
596
597 static struct platform_driver davinci_rtc_driver = {
598 .probe = davinci_rtc_probe,
599 .remove = __devexit_p(davinci_rtc_remove),
600 .driver = {
601 .name = "rtc_davinci",
602 .owner = THIS_MODULE,
603 },
604 };
605
606 static int __init rtc_init(void)
607 {
608 return platform_driver_probe(&davinci_rtc_driver, davinci_rtc_probe);
609 }
610 module_init(rtc_init);
611
612 static void __exit rtc_exit(void)
613 {
614 platform_driver_unregister(&davinci_rtc_driver);
615 }
616 module_exit(rtc_exit);
617
618 MODULE_AUTHOR("Miguel Aguilar <miguel.aguilar@ridgerun.com>");
619 MODULE_DESCRIPTION("Texas Instruments DaVinci PRTC Driver");
620 MODULE_LICENSE("GPL");
kernel-based virtual machine