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[ARM] balance parenthesis in header file
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / rtc / rtc-at91rm9200.c
blob37082616482bd7a79ad3162ba00ca82bd260894e
1 /*
2 * Real Time Clock interface for Linux on Atmel AT91RM9200
3 *
4 * Copyright (C) 2002 Rick Bronson
5 *
6 * Converted to RTC class model by Andrew Victor
7 *
8 * Ported to Linux 2.6 by Steven Scholz
9 * Based on s3c2410-rtc.c Simtec Electronics
10 *
11 * Based on sa1100-rtc.c by Nils Faerber
12 * Based on rtc.c by Paul Gortmaker
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 */
20
21 #include <linux/module.h>
22 #include <linux/kernel.h>
23 #include <linux/platform_device.h>
24 #include <linux/time.h>
25 #include <linux/rtc.h>
26 #include <linux/bcd.h>
27 #include <linux/interrupt.h>
28 #include <linux/ioctl.h>
29 #include <linux/completion.h>
30
31 #include <asm/uaccess.h>
32
33 #include <mach/at91_rtc.h>
34
35
36 #define AT91_RTC_EPOCH 1900UL /* just like arch/arm/common/rtctime.c */
37
38 static DECLARE_COMPLETION(at91_rtc_updated);
39 static unsigned int at91_alarm_year = AT91_RTC_EPOCH;
40
41 /*
42 * Decode time/date into rtc_time structure
43 */
44 static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg,
45 struct rtc_time *tm)
46 {
47 unsigned int time, date;
48
49 /* must read twice in case it changes */
50 do {
51 time = at91_sys_read(timereg);
52 date = at91_sys_read(calreg);
53 } while ((time != at91_sys_read(timereg)) ||
54 (date != at91_sys_read(calreg)));
55
56 tm->tm_sec = BCD2BIN((time & AT91_RTC_SEC) >> 0);
57 tm->tm_min = BCD2BIN((time & AT91_RTC_MIN) >> 8);
58 tm->tm_hour = BCD2BIN((time & AT91_RTC_HOUR) >> 16);
59
60 /*
61 * The Calendar Alarm register does not have a field for
62 * the year - so these will return an invalid value. When an
63 * alarm is set, at91_alarm_year wille store the current year.
64 */
65 tm->tm_year = BCD2BIN(date & AT91_RTC_CENT) * 100; /* century */
66 tm->tm_year += BCD2BIN((date & AT91_RTC_YEAR) >> 8); /* year */
67
68 tm->tm_wday = BCD2BIN((date & AT91_RTC_DAY) >> 21) - 1; /* day of the week [0-6], Sunday=0 */
69 tm->tm_mon = BCD2BIN((date & AT91_RTC_MONTH) >> 16) - 1;
70 tm->tm_mday = BCD2BIN((date & AT91_RTC_DATE) >> 24);
71 }
72
73 /*
74 * Read current time and date in RTC
75 */
76 static int at91_rtc_readtime(struct device *dev, struct rtc_time *tm)
77 {
78 at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, tm);
79 tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
80 tm->tm_year = tm->tm_year - 1900;
81
82 pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
83 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
84 tm->tm_hour, tm->tm_min, tm->tm_sec);
85
86 return 0;
87 }
88
89 /*
90 * Set current time and date in RTC
91 */
92 static int at91_rtc_settime(struct device *dev, struct rtc_time *tm)
93 {
94 unsigned long cr;
95
96 pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
97 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
98 tm->tm_hour, tm->tm_min, tm->tm_sec);
99
100 /* Stop Time/Calendar from counting */
101 cr = at91_sys_read(AT91_RTC_CR);
102 at91_sys_write(AT91_RTC_CR, cr | AT91_RTC_UPDCAL | AT91_RTC_UPDTIM);
103
104 at91_sys_write(AT91_RTC_IER, AT91_RTC_ACKUPD);
105 wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */
106 at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD);
107
108 at91_sys_write(AT91_RTC_TIMR,
109 BIN2BCD(tm->tm_sec) << 0
110 | BIN2BCD(tm->tm_min) << 8
111 | BIN2BCD(tm->tm_hour) << 16);
112
113 at91_sys_write(AT91_RTC_CALR,
114 BIN2BCD((tm->tm_year + 1900) / 100) /* century */
115 | BIN2BCD(tm->tm_year % 100) << 8 /* year */
116 | BIN2BCD(tm->tm_mon + 1) << 16 /* tm_mon starts at zero */
117 | BIN2BCD(tm->tm_wday + 1) << 21 /* day of the week [0-6], Sunday=0 */
118 | BIN2BCD(tm->tm_mday) << 24);
119
120 /* Restart Time/Calendar */
121 cr = at91_sys_read(AT91_RTC_CR);
122 at91_sys_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL | AT91_RTC_UPDTIM));
123
124 return 0;
125 }
126
127 /*
128 * Read alarm time and date in RTC
129 */
130 static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
131 {
132 struct rtc_time *tm = &alrm->time;
133
134 at91_rtc_decodetime(AT91_RTC_TIMALR, AT91_RTC_CALALR, tm);
135 tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
136 tm->tm_year = at91_alarm_year - 1900;
137
138 alrm->enabled = (at91_sys_read(AT91_RTC_IMR) & AT91_RTC_ALARM)
139 ? 1 : 0;
140
141 pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
142 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
143 tm->tm_hour, tm->tm_min, tm->tm_sec);
144
145 return 0;
146 }
147
148 /*
149 * Set alarm time and date in RTC
150 */
151 static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
152 {
153 struct rtc_time tm;
154
155 at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, &tm);
156
157 at91_alarm_year = tm.tm_year;
158
159 tm.tm_hour = alrm->time.tm_hour;
160 tm.tm_min = alrm->time.tm_min;
161 tm.tm_sec = alrm->time.tm_sec;
162
163 at91_sys_write(AT91_RTC_IDR, AT91_RTC_ALARM);
164 at91_sys_write(AT91_RTC_TIMALR,
165 BIN2BCD(tm.tm_sec) << 0
166 | BIN2BCD(tm.tm_min) << 8
167 | BIN2BCD(tm.tm_hour) << 16
168 | AT91_RTC_HOUREN | AT91_RTC_MINEN | AT91_RTC_SECEN);
169 at91_sys_write(AT91_RTC_CALALR,
170 BIN2BCD(tm.tm_mon + 1) << 16 /* tm_mon starts at zero */
171 | BIN2BCD(tm.tm_mday) << 24
172 | AT91_RTC_DATEEN | AT91_RTC_MTHEN);
173
174 if (alrm->enabled) {
175 at91_sys_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
176 at91_sys_write(AT91_RTC_IER, AT91_RTC_ALARM);
177 }
178
179 pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
180 at91_alarm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour,
181 tm.tm_min, tm.tm_sec);
182
183 return 0;
184 }
185
186 /*
187 * Handle commands from user-space
188 */
189 static int at91_rtc_ioctl(struct device *dev, unsigned int cmd,
190 unsigned long arg)
191 {
192 int ret = 0;
193
194 pr_debug("%s(): cmd=%08x, arg=%08lx.\n", __func__, cmd, arg);
195
196 /* important: scrub old status before enabling IRQs */
197 switch (cmd) {
198 case RTC_AIE_OFF: /* alarm off */
199 at91_sys_write(AT91_RTC_IDR, AT91_RTC_ALARM);
200 break;
201 case RTC_AIE_ON: /* alarm on */
202 at91_sys_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
203 at91_sys_write(AT91_RTC_IER, AT91_RTC_ALARM);
204 break;
205 case RTC_UIE_OFF: /* update off */
206 at91_sys_write(AT91_RTC_IDR, AT91_RTC_SECEV);
207 break;
208 case RTC_UIE_ON: /* update on */
209 at91_sys_write(AT91_RTC_SCCR, AT91_RTC_SECEV);
210 at91_sys_write(AT91_RTC_IER, AT91_RTC_SECEV);
211 break;
212 default:
213 ret = -ENOIOCTLCMD;
214 break;
215 }
216
217 return ret;
218 }
219
220 /*
221 * Provide additional RTC information in /proc/driver/rtc
222 */
223 static int at91_rtc_proc(struct device *dev, struct seq_file *seq)
224 {
225 unsigned long imr = at91_sys_read(AT91_RTC_IMR);
226
227 seq_printf(seq, "update_IRQ\t: %s\n",
228 (imr & AT91_RTC_ACKUPD) ? "yes" : "no");
229 seq_printf(seq, "periodic_IRQ\t: %s\n",
230 (imr & AT91_RTC_SECEV) ? "yes" : "no");
231
232 return 0;
233 }
234
235 /*
236 * IRQ handler for the RTC
237 */
238 static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id)
239 {
240 struct platform_device *pdev = dev_id;
241 struct rtc_device *rtc = platform_get_drvdata(pdev);
242 unsigned int rtsr;
243 unsigned long events = 0;
244
245 rtsr = at91_sys_read(AT91_RTC_SR) & at91_sys_read(AT91_RTC_IMR);
246 if (rtsr) { /* this interrupt is shared! Is it ours? */
247 if (rtsr & AT91_RTC_ALARM)
248 events |= (RTC_AF | RTC_IRQF);
249 if (rtsr & AT91_RTC_SECEV)
250 events |= (RTC_UF | RTC_IRQF);
251 if (rtsr & AT91_RTC_ACKUPD)
252 complete(&at91_rtc_updated);
253
254 at91_sys_write(AT91_RTC_SCCR, rtsr); /* clear status reg */
255
256 rtc_update_irq(rtc, 1, events);
257
258 pr_debug("%s(): num=%ld, events=0x%02lx\n", __func__,
259 events >> 8, events & 0x000000FF);
260
261 return IRQ_HANDLED;
262 }
263 return IRQ_NONE; /* not handled */
264 }
265
266 static const struct rtc_class_ops at91_rtc_ops = {
267 .ioctl = at91_rtc_ioctl,
268 .read_time = at91_rtc_readtime,
269 .set_time = at91_rtc_settime,
270 .read_alarm = at91_rtc_readalarm,
271 .set_alarm = at91_rtc_setalarm,
272 .proc = at91_rtc_proc,
273 };
274
275 /*
276 * Initialize and install RTC driver
277 */
278 static int __init at91_rtc_probe(struct platform_device *pdev)
279 {
280 struct rtc_device *rtc;
281 int ret;
282
283 at91_sys_write(AT91_RTC_CR, 0);
284 at91_sys_write(AT91_RTC_MR, 0); /* 24 hour mode */
285
286 /* Disable all interrupts */
287 at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
288 AT91_RTC_SECEV | AT91_RTC_TIMEV |
289 AT91_RTC_CALEV);
290
291 ret = request_irq(AT91_ID_SYS, at91_rtc_interrupt,
292 IRQF_DISABLED | IRQF_SHARED,
293 "at91_rtc", pdev);
294 if (ret) {
295 printk(KERN_ERR "at91_rtc: IRQ %d already in use.\n",
296 AT91_ID_SYS);
297 return ret;
298 }
299
300 /* cpu init code should really have flagged this device as
301 * being wake-capable; if it didn't, do that here.
302 */
303 if (!device_can_wakeup(&pdev->dev))
304 device_init_wakeup(&pdev->dev, 1);
305
306 rtc = rtc_device_register(pdev->name, &pdev->dev,
307 &at91_rtc_ops, THIS_MODULE);
308 if (IS_ERR(rtc)) {
309 free_irq(AT91_ID_SYS, pdev);
310 return PTR_ERR(rtc);
311 }
312 platform_set_drvdata(pdev, rtc);
313
314 printk(KERN_INFO "AT91 Real Time Clock driver.\n");
315 return 0;
316 }
317
318 /*
319 * Disable and remove the RTC driver
320 */
321 static int __exit at91_rtc_remove(struct platform_device *pdev)
322 {
323 struct rtc_device *rtc = platform_get_drvdata(pdev);
324
325 /* Disable all interrupts */
326 at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
327 AT91_RTC_SECEV | AT91_RTC_TIMEV |
328 AT91_RTC_CALEV);
329 free_irq(AT91_ID_SYS, pdev);
330
331 rtc_device_unregister(rtc);
332 platform_set_drvdata(pdev, NULL);
333
334 return 0;
335 }
336
337 #ifdef CONFIG_PM
338
339 /* AT91RM9200 RTC Power management control */
340
341 static u32 at91_rtc_imr;
342
343 static int at91_rtc_suspend(struct platform_device *pdev, pm_message_t state)
344 {
345 /* this IRQ is shared with DBGU and other hardware which isn't
346 * necessarily doing PM like we are...
347 */
348 at91_rtc_imr = at91_sys_read(AT91_RTC_IMR)
349 & (AT91_RTC_ALARM|AT91_RTC_SECEV);
350 if (at91_rtc_imr) {
351 if (device_may_wakeup(&pdev->dev))
352 enable_irq_wake(AT91_ID_SYS);
353 else
354 at91_sys_write(AT91_RTC_IDR, at91_rtc_imr);
355 }
356 return 0;
357 }
358
359 static int at91_rtc_resume(struct platform_device *pdev)
360 {
361 if (at91_rtc_imr) {
362 if (device_may_wakeup(&pdev->dev))
363 disable_irq_wake(AT91_ID_SYS);
364 else
365 at91_sys_write(AT91_RTC_IER, at91_rtc_imr);
366 }
367 return 0;
368 }
369 #else
370 #define at91_rtc_suspend NULL
371 #define at91_rtc_resume NULL
372 #endif
373
374 static struct platform_driver at91_rtc_driver = {
375 .remove = __exit_p(at91_rtc_remove),
376 .suspend = at91_rtc_suspend,
377 .resume = at91_rtc_resume,
378 .driver = {
379 .name = "at91_rtc",
380 .owner = THIS_MODULE,
381 },
382 };
383
384 static int __init at91_rtc_init(void)
385 {
386 return platform_driver_probe(&at91_rtc_driver, at91_rtc_probe);
387 }
388
389 static void __exit at91_rtc_exit(void)
390 {
391 platform_driver_unregister(&at91_rtc_driver);
392 }
393
394 module_init(at91_rtc_init);
395 module_exit(at91_rtc_exit);
396
397 MODULE_AUTHOR("Rick Bronson");
398 MODULE_DESCRIPTION("RTC driver for Atmel AT91RM9200");
399 MODULE_LICENSE("GPL");
400 MODULE_ALIAS("platform:at91_rtc");
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