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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 | |
d28bdfc5 JCPV |
35 | #define at91_rtc_read(field) \ |
36 | __raw_readl(at91_rtc_regs + field) | |
37 | #define at91_rtc_write(field, val) \ | |
38 | __raw_writel((val), at91_rtc_regs + field) | |
788b1fc6 | 39 | |
788b1fc6 AV |
40 | #define AT91_RTC_EPOCH 1900UL /* just like arch/arm/common/rtctime.c */ |
41 | ||
42 | static DECLARE_COMPLETION(at91_rtc_updated); | |
43 | static unsigned int at91_alarm_year = AT91_RTC_EPOCH; | |
d28bdfc5 JCPV |
44 | static void __iomem *at91_rtc_regs; |
45 | static int irq; | |
788b1fc6 | 46 | |
788b1fc6 AV |
47 | /* |
48 | * Decode time/date into rtc_time structure | |
49 | */ | |
e7a8bb12 AM |
50 | static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg, |
51 | struct rtc_time *tm) | |
788b1fc6 AV |
52 | { |
53 | unsigned int time, date; | |
54 | ||
55 | /* must read twice in case it changes */ | |
56 | do { | |
d28bdfc5 JCPV |
57 | time = at91_rtc_read(timereg); |
58 | date = at91_rtc_read(calreg); | |
59 | } while ((time != at91_rtc_read(timereg)) || | |
60 | (date != at91_rtc_read(calreg))); | |
788b1fc6 | 61 | |
fe20ba70 AB |
62 | tm->tm_sec = bcd2bin((time & AT91_RTC_SEC) >> 0); |
63 | tm->tm_min = bcd2bin((time & AT91_RTC_MIN) >> 8); | |
64 | tm->tm_hour = bcd2bin((time & AT91_RTC_HOUR) >> 16); | |
788b1fc6 AV |
65 | |
66 | /* | |
67 | * The Calendar Alarm register does not have a field for | |
68 | * the year - so these will return an invalid value. When an | |
25985edc | 69 | * alarm is set, at91_alarm_year will store the current year. |
788b1fc6 | 70 | */ |
fe20ba70 AB |
71 | tm->tm_year = bcd2bin(date & AT91_RTC_CENT) * 100; /* century */ |
72 | tm->tm_year += bcd2bin((date & AT91_RTC_YEAR) >> 8); /* year */ | |
788b1fc6 | 73 | |
fe20ba70 AB |
74 | tm->tm_wday = bcd2bin((date & AT91_RTC_DAY) >> 21) - 1; /* day of the week [0-6], Sunday=0 */ |
75 | tm->tm_mon = bcd2bin((date & AT91_RTC_MONTH) >> 16) - 1; | |
76 | tm->tm_mday = bcd2bin((date & AT91_RTC_DATE) >> 24); | |
788b1fc6 AV |
77 | } |
78 | ||
79 | /* | |
80 | * Read current time and date in RTC | |
81 | */ | |
82 | static int at91_rtc_readtime(struct device *dev, struct rtc_time *tm) | |
83 | { | |
84 | at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, tm); | |
85 | tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year); | |
86 | tm->tm_year = tm->tm_year - 1900; | |
87 | ||
2a4e2b87 | 88 | pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
e7a8bb12 AM |
89 | 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, |
90 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
788b1fc6 AV |
91 | |
92 | return 0; | |
93 | } | |
94 | ||
95 | /* | |
96 | * Set current time and date in RTC | |
97 | */ | |
98 | static int at91_rtc_settime(struct device *dev, struct rtc_time *tm) | |
99 | { | |
100 | unsigned long cr; | |
101 | ||
2a4e2b87 | 102 | pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
e7a8bb12 AM |
103 | 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, |
104 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
788b1fc6 AV |
105 | |
106 | /* Stop Time/Calendar from counting */ | |
d28bdfc5 JCPV |
107 | cr = at91_rtc_read(AT91_RTC_CR); |
108 | at91_rtc_write(AT91_RTC_CR, cr | AT91_RTC_UPDCAL | AT91_RTC_UPDTIM); | |
788b1fc6 | 109 | |
d28bdfc5 | 110 | at91_rtc_write(AT91_RTC_IER, AT91_RTC_ACKUPD); |
e7a8bb12 | 111 | wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */ |
d28bdfc5 | 112 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD); |
788b1fc6 | 113 | |
d28bdfc5 | 114 | at91_rtc_write(AT91_RTC_TIMR, |
fe20ba70 AB |
115 | bin2bcd(tm->tm_sec) << 0 |
116 | | bin2bcd(tm->tm_min) << 8 | |
117 | | bin2bcd(tm->tm_hour) << 16); | |
788b1fc6 | 118 | |
d28bdfc5 | 119 | at91_rtc_write(AT91_RTC_CALR, |
fe20ba70 AB |
120 | bin2bcd((tm->tm_year + 1900) / 100) /* century */ |
121 | | bin2bcd(tm->tm_year % 100) << 8 /* year */ | |
122 | | bin2bcd(tm->tm_mon + 1) << 16 /* tm_mon starts at zero */ | |
123 | | bin2bcd(tm->tm_wday + 1) << 21 /* day of the week [0-6], Sunday=0 */ | |
124 | | bin2bcd(tm->tm_mday) << 24); | |
788b1fc6 AV |
125 | |
126 | /* Restart Time/Calendar */ | |
d28bdfc5 JCPV |
127 | cr = at91_rtc_read(AT91_RTC_CR); |
128 | at91_rtc_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL | AT91_RTC_UPDTIM)); | |
788b1fc6 AV |
129 | |
130 | return 0; | |
131 | } | |
132 | ||
133 | /* | |
134 | * Read alarm time and date in RTC | |
135 | */ | |
136 | static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm) | |
137 | { | |
138 | struct rtc_time *tm = &alrm->time; | |
139 | ||
140 | at91_rtc_decodetime(AT91_RTC_TIMALR, AT91_RTC_CALALR, tm); | |
141 | tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year); | |
142 | tm->tm_year = at91_alarm_year - 1900; | |
143 | ||
d28bdfc5 | 144 | alrm->enabled = (at91_rtc_read(AT91_RTC_IMR) & AT91_RTC_ALARM) |
a2db8dfc DB |
145 | ? 1 : 0; |
146 | ||
2a4e2b87 | 147 | pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
e7a8bb12 AM |
148 | 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, |
149 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
788b1fc6 AV |
150 | |
151 | return 0; | |
152 | } | |
153 | ||
154 | /* | |
155 | * Set alarm time and date in RTC | |
156 | */ | |
157 | static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) | |
158 | { | |
159 | struct rtc_time tm; | |
160 | ||
161 | at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, &tm); | |
162 | ||
163 | at91_alarm_year = tm.tm_year; | |
164 | ||
165 | tm.tm_hour = alrm->time.tm_hour; | |
166 | tm.tm_min = alrm->time.tm_min; | |
167 | tm.tm_sec = alrm->time.tm_sec; | |
168 | ||
d28bdfc5 JCPV |
169 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM); |
170 | at91_rtc_write(AT91_RTC_TIMALR, | |
fe20ba70 AB |
171 | bin2bcd(tm.tm_sec) << 0 |
172 | | bin2bcd(tm.tm_min) << 8 | |
173 | | bin2bcd(tm.tm_hour) << 16 | |
788b1fc6 | 174 | | AT91_RTC_HOUREN | AT91_RTC_MINEN | AT91_RTC_SECEN); |
d28bdfc5 | 175 | at91_rtc_write(AT91_RTC_CALALR, |
fe20ba70 AB |
176 | bin2bcd(tm.tm_mon + 1) << 16 /* tm_mon starts at zero */ |
177 | | bin2bcd(tm.tm_mday) << 24 | |
788b1fc6 AV |
178 | | AT91_RTC_DATEEN | AT91_RTC_MTHEN); |
179 | ||
449321b3 | 180 | if (alrm->enabled) { |
d28bdfc5 JCPV |
181 | at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM); |
182 | at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM); | |
449321b3 | 183 | } |
5d4675a8 | 184 | |
2a4e2b87 | 185 | pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
e7a8bb12 AM |
186 | at91_alarm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour, |
187 | tm.tm_min, tm.tm_sec); | |
788b1fc6 AV |
188 | |
189 | return 0; | |
190 | } | |
191 | ||
16380c15 JS |
192 | static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) |
193 | { | |
194 | pr_debug("%s(): cmd=%08x\n", __func__, enabled); | |
195 | ||
196 | if (enabled) { | |
d28bdfc5 JCPV |
197 | at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM); |
198 | at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM); | |
16380c15 | 199 | } else |
d28bdfc5 | 200 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM); |
16380c15 JS |
201 | |
202 | return 0; | |
203 | } | |
788b1fc6 AV |
204 | /* |
205 | * Provide additional RTC information in /proc/driver/rtc | |
206 | */ | |
207 | static int at91_rtc_proc(struct device *dev, struct seq_file *seq) | |
208 | { | |
d28bdfc5 | 209 | unsigned long imr = at91_rtc_read(AT91_RTC_IMR); |
788b1fc6 | 210 | |
e7a8bb12 AM |
211 | seq_printf(seq, "update_IRQ\t: %s\n", |
212 | (imr & AT91_RTC_ACKUPD) ? "yes" : "no"); | |
213 | seq_printf(seq, "periodic_IRQ\t: %s\n", | |
214 | (imr & AT91_RTC_SECEV) ? "yes" : "no"); | |
788b1fc6 AV |
215 | |
216 | return 0; | |
217 | } | |
218 | ||
219 | /* | |
220 | * IRQ handler for the RTC | |
221 | */ | |
7d12e780 | 222 | static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id) |
788b1fc6 | 223 | { |
e7a8bb12 | 224 | struct platform_device *pdev = dev_id; |
788b1fc6 AV |
225 | struct rtc_device *rtc = platform_get_drvdata(pdev); |
226 | unsigned int rtsr; | |
227 | unsigned long events = 0; | |
228 | ||
d28bdfc5 | 229 | rtsr = at91_rtc_read(AT91_RTC_SR) & at91_rtc_read(AT91_RTC_IMR); |
788b1fc6 AV |
230 | if (rtsr) { /* this interrupt is shared! Is it ours? */ |
231 | if (rtsr & AT91_RTC_ALARM) | |
232 | events |= (RTC_AF | RTC_IRQF); | |
233 | if (rtsr & AT91_RTC_SECEV) | |
234 | events |= (RTC_UF | RTC_IRQF); | |
235 | if (rtsr & AT91_RTC_ACKUPD) | |
236 | complete(&at91_rtc_updated); | |
237 | ||
d28bdfc5 | 238 | at91_rtc_write(AT91_RTC_SCCR, rtsr); /* clear status reg */ |
788b1fc6 | 239 | |
ab6a2d70 | 240 | rtc_update_irq(rtc, 1, events); |
788b1fc6 | 241 | |
2a4e2b87 | 242 | pr_debug("%s(): num=%ld, events=0x%02lx\n", __func__, |
788b1fc6 AV |
243 | events >> 8, events & 0x000000FF); |
244 | ||
245 | return IRQ_HANDLED; | |
246 | } | |
247 | return IRQ_NONE; /* not handled */ | |
248 | } | |
249 | ||
ff8371ac | 250 | static const struct rtc_class_ops at91_rtc_ops = { |
788b1fc6 AV |
251 | .read_time = at91_rtc_readtime, |
252 | .set_time = at91_rtc_settime, | |
253 | .read_alarm = at91_rtc_readalarm, | |
254 | .set_alarm = at91_rtc_setalarm, | |
255 | .proc = at91_rtc_proc, | |
16380c15 | 256 | .alarm_irq_enable = at91_rtc_alarm_irq_enable, |
788b1fc6 AV |
257 | }; |
258 | ||
259 | /* | |
260 | * Initialize and install RTC driver | |
261 | */ | |
262 | static int __init at91_rtc_probe(struct platform_device *pdev) | |
263 | { | |
264 | struct rtc_device *rtc; | |
d28bdfc5 JCPV |
265 | struct resource *regs; |
266 | int ret = 0; | |
788b1fc6 | 267 | |
d28bdfc5 JCPV |
268 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
269 | if (!regs) { | |
270 | dev_err(&pdev->dev, "no mmio resource defined\n"); | |
271 | return -ENXIO; | |
272 | } | |
273 | ||
274 | irq = platform_get_irq(pdev, 0); | |
275 | if (irq < 0) { | |
276 | dev_err(&pdev->dev, "no irq resource defined\n"); | |
277 | return -ENXIO; | |
278 | } | |
279 | ||
280 | at91_rtc_regs = ioremap(regs->start, resource_size(regs)); | |
281 | if (!at91_rtc_regs) { | |
282 | dev_err(&pdev->dev, "failed to map registers, aborting.\n"); | |
283 | return -ENOMEM; | |
284 | } | |
285 | ||
286 | at91_rtc_write(AT91_RTC_CR, 0); | |
287 | at91_rtc_write(AT91_RTC_MR, 0); /* 24 hour mode */ | |
788b1fc6 AV |
288 | |
289 | /* Disable all interrupts */ | |
d28bdfc5 | 290 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM | |
e7a8bb12 AM |
291 | AT91_RTC_SECEV | AT91_RTC_TIMEV | |
292 | AT91_RTC_CALEV); | |
788b1fc6 | 293 | |
d28bdfc5 | 294 | ret = request_irq(irq, at91_rtc_interrupt, |
dac94d9e | 295 | IRQF_SHARED, |
d728b1e6 | 296 | "at91_rtc", pdev); |
788b1fc6 | 297 | if (ret) { |
e7a8bb12 | 298 | printk(KERN_ERR "at91_rtc: IRQ %d already in use.\n", |
d28bdfc5 | 299 | irq); |
788b1fc6 AV |
300 | return ret; |
301 | } | |
302 | ||
5d4675a8 DB |
303 | /* cpu init code should really have flagged this device as |
304 | * being wake-capable; if it didn't, do that here. | |
305 | */ | |
306 | if (!device_can_wakeup(&pdev->dev)) | |
307 | device_init_wakeup(&pdev->dev, 1); | |
308 | ||
e7a8bb12 AM |
309 | rtc = rtc_device_register(pdev->name, &pdev->dev, |
310 | &at91_rtc_ops, THIS_MODULE); | |
788b1fc6 | 311 | if (IS_ERR(rtc)) { |
d28bdfc5 | 312 | free_irq(irq, pdev); |
788b1fc6 AV |
313 | return PTR_ERR(rtc); |
314 | } | |
315 | platform_set_drvdata(pdev, rtc); | |
316 | ||
317 | printk(KERN_INFO "AT91 Real Time Clock driver.\n"); | |
318 | return 0; | |
319 | } | |
320 | ||
321 | /* | |
322 | * Disable and remove the RTC driver | |
323 | */ | |
5d4675a8 | 324 | static int __exit at91_rtc_remove(struct platform_device *pdev) |
788b1fc6 AV |
325 | { |
326 | struct rtc_device *rtc = platform_get_drvdata(pdev); | |
327 | ||
328 | /* Disable all interrupts */ | |
d28bdfc5 | 329 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM | |
e7a8bb12 AM |
330 | AT91_RTC_SECEV | AT91_RTC_TIMEV | |
331 | AT91_RTC_CALEV); | |
d28bdfc5 | 332 | free_irq(irq, pdev); |
788b1fc6 AV |
333 | |
334 | rtc_device_unregister(rtc); | |
335 | platform_set_drvdata(pdev, NULL); | |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
340 | #ifdef CONFIG_PM | |
341 | ||
342 | /* AT91RM9200 RTC Power management control */ | |
343 | ||
90b4d648 | 344 | static u32 at91_rtc_imr; |
788b1fc6 | 345 | |
dac94d9e | 346 | static int at91_rtc_suspend(struct device *dev) |
788b1fc6 | 347 | { |
90b4d648 DB |
348 | /* this IRQ is shared with DBGU and other hardware which isn't |
349 | * necessarily doing PM like we are... | |
350 | */ | |
d28bdfc5 | 351 | at91_rtc_imr = at91_rtc_read(AT91_RTC_IMR) |
90b4d648 DB |
352 | & (AT91_RTC_ALARM|AT91_RTC_SECEV); |
353 | if (at91_rtc_imr) { | |
dac94d9e | 354 | if (device_may_wakeup(dev)) |
d28bdfc5 | 355 | enable_irq_wake(irq); |
90b4d648 | 356 | else |
d28bdfc5 | 357 | at91_rtc_write(AT91_RTC_IDR, at91_rtc_imr); |
90b4d648 | 358 | } |
788b1fc6 AV |
359 | return 0; |
360 | } | |
361 | ||
dac94d9e | 362 | static int at91_rtc_resume(struct device *dev) |
788b1fc6 | 363 | { |
90b4d648 | 364 | if (at91_rtc_imr) { |
dac94d9e | 365 | if (device_may_wakeup(dev)) |
d28bdfc5 | 366 | disable_irq_wake(irq); |
90b4d648 | 367 | else |
d28bdfc5 | 368 | at91_rtc_write(AT91_RTC_IER, at91_rtc_imr); |
90b4d648 | 369 | } |
788b1fc6 AV |
370 | return 0; |
371 | } | |
dac94d9e DB |
372 | |
373 | static const struct dev_pm_ops at91_rtc_pm = { | |
374 | .suspend = at91_rtc_suspend, | |
375 | .resume = at91_rtc_resume, | |
376 | }; | |
377 | ||
378 | #define at91_rtc_pm_ptr &at91_rtc_pm | |
379 | ||
788b1fc6 | 380 | #else |
dac94d9e | 381 | #define at91_rtc_pm_ptr NULL |
788b1fc6 AV |
382 | #endif |
383 | ||
384 | static struct platform_driver at91_rtc_driver = { | |
5d4675a8 | 385 | .remove = __exit_p(at91_rtc_remove), |
788b1fc6 AV |
386 | .driver = { |
387 | .name = "at91_rtc", | |
388 | .owner = THIS_MODULE, | |
dac94d9e | 389 | .pm = at91_rtc_pm_ptr, |
788b1fc6 AV |
390 | }, |
391 | }; | |
392 | ||
393 | static int __init at91_rtc_init(void) | |
394 | { | |
5d4675a8 | 395 | return platform_driver_probe(&at91_rtc_driver, at91_rtc_probe); |
788b1fc6 AV |
396 | } |
397 | ||
398 | static void __exit at91_rtc_exit(void) | |
399 | { | |
400 | platform_driver_unregister(&at91_rtc_driver); | |
401 | } | |
402 | ||
788b1fc6 AV |
403 | module_init(at91_rtc_init); |
404 | module_exit(at91_rtc_exit); | |
405 | ||
406 | MODULE_AUTHOR("Rick Bronson"); | |
407 | MODULE_DESCRIPTION("RTC driver for Atmel AT91RM9200"); | |
408 | MODULE_LICENSE("GPL"); | |
ad28a07b | 409 | MODULE_ALIAS("platform:at91_rtc"); |