Commit | Line | Data |
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788b1fc6 AV |
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> | |
fb0d4ec4 | 32 | |
a09e64fb | 33 | #include <mach/at91_rtc.h> |
d73e3cd7 | 34 | |
788b1fc6 | 35 | |
788b1fc6 AV |
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 | ||
788b1fc6 AV |
41 | /* |
42 | * Decode time/date into rtc_time structure | |
43 | */ | |
e7a8bb12 AM |
44 | static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg, |
45 | struct rtc_time *tm) | |
788b1fc6 AV |
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); | |
e7a8bb12 AM |
53 | } while ((time != at91_sys_read(timereg)) || |
54 | (date != at91_sys_read(calreg))); | |
788b1fc6 AV |
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 | */ | |
e7a8bb12 AM |
65 | tm->tm_year = BCD2BIN(date & AT91_RTC_CENT) * 100; /* century */ |
66 | tm->tm_year += BCD2BIN((date & AT91_RTC_YEAR) >> 8); /* year */ | |
788b1fc6 AV |
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 | ||
2a4e2b87 | 82 | pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
e7a8bb12 AM |
83 | 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, |
84 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
788b1fc6 AV |
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 | ||
2a4e2b87 | 96 | pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
e7a8bb12 AM |
97 | 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, |
98 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
788b1fc6 AV |
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); | |
e7a8bb12 | 105 | wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */ |
788b1fc6 AV |
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, | |
e7a8bb12 AM |
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 */ | |
788b1fc6 AV |
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 | ||
a2db8dfc DB |
138 | alrm->enabled = (at91_sys_read(AT91_RTC_IMR) & AT91_RTC_ALARM) |
139 | ? 1 : 0; | |
140 | ||
2a4e2b87 | 141 | pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
e7a8bb12 AM |
142 | 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, |
143 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
788b1fc6 AV |
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 | ||
5d4675a8 | 163 | at91_sys_write(AT91_RTC_IDR, AT91_RTC_ALARM); |
788b1fc6 AV |
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 | ||
449321b3 DB |
174 | if (alrm->enabled) { |
175 | at91_sys_write(AT91_RTC_SCCR, AT91_RTC_ALARM); | |
5d4675a8 | 176 | at91_sys_write(AT91_RTC_IER, AT91_RTC_ALARM); |
449321b3 | 177 | } |
5d4675a8 | 178 | |
2a4e2b87 | 179 | pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
e7a8bb12 AM |
180 | at91_alarm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour, |
181 | tm.tm_min, tm.tm_sec); | |
788b1fc6 AV |
182 | |
183 | return 0; | |
184 | } | |
185 | ||
186 | /* | |
187 | * Handle commands from user-space | |
188 | */ | |
e7a8bb12 AM |
189 | static int at91_rtc_ioctl(struct device *dev, unsigned int cmd, |
190 | unsigned long arg) | |
788b1fc6 AV |
191 | { |
192 | int ret = 0; | |
193 | ||
2a4e2b87 | 194 | pr_debug("%s(): cmd=%08x, arg=%08lx.\n", __func__, cmd, arg); |
788b1fc6 | 195 | |
449321b3 | 196 | /* important: scrub old status before enabling IRQs */ |
788b1fc6 AV |
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 */ | |
449321b3 | 202 | at91_sys_write(AT91_RTC_SCCR, AT91_RTC_ALARM); |
788b1fc6 AV |
203 | at91_sys_write(AT91_RTC_IER, AT91_RTC_ALARM); |
204 | break; | |
205 | case RTC_UIE_OFF: /* update off */ | |
788b1fc6 AV |
206 | at91_sys_write(AT91_RTC_IDR, AT91_RTC_SECEV); |
207 | break; | |
208 | case RTC_UIE_ON: /* update on */ | |
449321b3 | 209 | at91_sys_write(AT91_RTC_SCCR, AT91_RTC_SECEV); |
788b1fc6 AV |
210 | at91_sys_write(AT91_RTC_IER, AT91_RTC_SECEV); |
211 | break; | |
788b1fc6 AV |
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 | ||
e7a8bb12 AM |
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"); | |
788b1fc6 AV |
231 | |
232 | return 0; | |
233 | } | |
234 | ||
235 | /* | |
236 | * IRQ handler for the RTC | |
237 | */ | |
7d12e780 | 238 | static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id) |
788b1fc6 | 239 | { |
e7a8bb12 | 240 | struct platform_device *pdev = dev_id; |
788b1fc6 AV |
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 | ||
e7a8bb12 | 254 | at91_sys_write(AT91_RTC_SCCR, rtsr); /* clear status reg */ |
788b1fc6 | 255 | |
ab6a2d70 | 256 | rtc_update_irq(rtc, 1, events); |
788b1fc6 | 257 | |
2a4e2b87 | 258 | pr_debug("%s(): num=%ld, events=0x%02lx\n", __func__, |
788b1fc6 AV |
259 | events >> 8, events & 0x000000FF); |
260 | ||
261 | return IRQ_HANDLED; | |
262 | } | |
263 | return IRQ_NONE; /* not handled */ | |
264 | } | |
265 | ||
ff8371ac | 266 | static const struct rtc_class_ops at91_rtc_ops = { |
788b1fc6 AV |
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 */ | |
e7a8bb12 AM |
287 | at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM | |
288 | AT91_RTC_SECEV | AT91_RTC_TIMEV | | |
289 | AT91_RTC_CALEV); | |
788b1fc6 | 290 | |
e7a8bb12 | 291 | ret = request_irq(AT91_ID_SYS, at91_rtc_interrupt, |
d728b1e6 DB |
292 | IRQF_DISABLED | IRQF_SHARED, |
293 | "at91_rtc", pdev); | |
788b1fc6 | 294 | if (ret) { |
e7a8bb12 AM |
295 | printk(KERN_ERR "at91_rtc: IRQ %d already in use.\n", |
296 | AT91_ID_SYS); | |
788b1fc6 AV |
297 | return ret; |
298 | } | |
299 | ||
5d4675a8 DB |
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 | ||
e7a8bb12 AM |
306 | rtc = rtc_device_register(pdev->name, &pdev->dev, |
307 | &at91_rtc_ops, THIS_MODULE); | |
788b1fc6 AV |
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 | */ | |
5d4675a8 | 321 | static int __exit at91_rtc_remove(struct platform_device *pdev) |
788b1fc6 AV |
322 | { |
323 | struct rtc_device *rtc = platform_get_drvdata(pdev); | |
324 | ||
325 | /* Disable all interrupts */ | |
e7a8bb12 AM |
326 | at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM | |
327 | AT91_RTC_SECEV | AT91_RTC_TIMEV | | |
328 | AT91_RTC_CALEV); | |
788b1fc6 AV |
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 | ||
90b4d648 | 341 | static u32 at91_rtc_imr; |
788b1fc6 AV |
342 | |
343 | static int at91_rtc_suspend(struct platform_device *pdev, pm_message_t state) | |
344 | { | |
90b4d648 DB |
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 | } | |
788b1fc6 AV |
356 | return 0; |
357 | } | |
358 | ||
359 | static int at91_rtc_resume(struct platform_device *pdev) | |
360 | { | |
90b4d648 DB |
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 | } | |
788b1fc6 AV |
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 = { | |
5d4675a8 | 375 | .remove = __exit_p(at91_rtc_remove), |
788b1fc6 AV |
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 | { | |
5d4675a8 | 386 | return platform_driver_probe(&at91_rtc_driver, at91_rtc_probe); |
788b1fc6 AV |
387 | } |
388 | ||
389 | static void __exit at91_rtc_exit(void) | |
390 | { | |
391 | platform_driver_unregister(&at91_rtc_driver); | |
392 | } | |
393 | ||
788b1fc6 AV |
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"); | |
ad28a07b | 400 | MODULE_ALIAS("platform:at91_rtc"); |