Commit | Line | Data |
---|---|---|
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> | |
14070ade | 30 | #include <linux/io.h> |
788b1fc6 AV |
31 | |
32 | #include <asm/uaccess.h> | |
fb0d4ec4 | 33 | |
75984df0 | 34 | #include "rtc-at91rm9200.h" |
d73e3cd7 | 35 | |
d28bdfc5 JCPV |
36 | #define at91_rtc_read(field) \ |
37 | __raw_readl(at91_rtc_regs + field) | |
38 | #define at91_rtc_write(field, val) \ | |
39 | __raw_writel((val), at91_rtc_regs + field) | |
788b1fc6 | 40 | |
788b1fc6 AV |
41 | #define AT91_RTC_EPOCH 1900UL /* just like arch/arm/common/rtctime.c */ |
42 | ||
43 | static DECLARE_COMPLETION(at91_rtc_updated); | |
44 | static unsigned int at91_alarm_year = AT91_RTC_EPOCH; | |
d28bdfc5 JCPV |
45 | static void __iomem *at91_rtc_regs; |
46 | static int irq; | |
788b1fc6 | 47 | |
788b1fc6 AV |
48 | /* |
49 | * Decode time/date into rtc_time structure | |
50 | */ | |
e7a8bb12 AM |
51 | static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg, |
52 | struct rtc_time *tm) | |
788b1fc6 AV |
53 | { |
54 | unsigned int time, date; | |
55 | ||
56 | /* must read twice in case it changes */ | |
57 | do { | |
d28bdfc5 JCPV |
58 | time = at91_rtc_read(timereg); |
59 | date = at91_rtc_read(calreg); | |
60 | } while ((time != at91_rtc_read(timereg)) || | |
61 | (date != at91_rtc_read(calreg))); | |
788b1fc6 | 62 | |
fe20ba70 AB |
63 | tm->tm_sec = bcd2bin((time & AT91_RTC_SEC) >> 0); |
64 | tm->tm_min = bcd2bin((time & AT91_RTC_MIN) >> 8); | |
65 | tm->tm_hour = bcd2bin((time & AT91_RTC_HOUR) >> 16); | |
788b1fc6 AV |
66 | |
67 | /* | |
68 | * The Calendar Alarm register does not have a field for | |
69 | * the year - so these will return an invalid value. When an | |
25985edc | 70 | * alarm is set, at91_alarm_year will store the current year. |
788b1fc6 | 71 | */ |
fe20ba70 AB |
72 | tm->tm_year = bcd2bin(date & AT91_RTC_CENT) * 100; /* century */ |
73 | tm->tm_year += bcd2bin((date & AT91_RTC_YEAR) >> 8); /* year */ | |
788b1fc6 | 74 | |
fe20ba70 AB |
75 | tm->tm_wday = bcd2bin((date & AT91_RTC_DAY) >> 21) - 1; /* day of the week [0-6], Sunday=0 */ |
76 | tm->tm_mon = bcd2bin((date & AT91_RTC_MONTH) >> 16) - 1; | |
77 | tm->tm_mday = bcd2bin((date & AT91_RTC_DATE) >> 24); | |
788b1fc6 AV |
78 | } |
79 | ||
80 | /* | |
81 | * Read current time and date in RTC | |
82 | */ | |
83 | static int at91_rtc_readtime(struct device *dev, struct rtc_time *tm) | |
84 | { | |
85 | at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, tm); | |
86 | tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year); | |
87 | tm->tm_year = tm->tm_year - 1900; | |
88 | ||
2a4e2b87 | 89 | pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
e7a8bb12 AM |
90 | 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, |
91 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
788b1fc6 AV |
92 | |
93 | return 0; | |
94 | } | |
95 | ||
96 | /* | |
97 | * Set current time and date in RTC | |
98 | */ | |
99 | static int at91_rtc_settime(struct device *dev, struct rtc_time *tm) | |
100 | { | |
101 | unsigned long cr; | |
102 | ||
2a4e2b87 | 103 | pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
e7a8bb12 AM |
104 | 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, |
105 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
788b1fc6 AV |
106 | |
107 | /* Stop Time/Calendar from counting */ | |
d28bdfc5 JCPV |
108 | cr = at91_rtc_read(AT91_RTC_CR); |
109 | at91_rtc_write(AT91_RTC_CR, cr | AT91_RTC_UPDCAL | AT91_RTC_UPDTIM); | |
788b1fc6 | 110 | |
d28bdfc5 | 111 | at91_rtc_write(AT91_RTC_IER, AT91_RTC_ACKUPD); |
e7a8bb12 | 112 | wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */ |
d28bdfc5 | 113 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD); |
788b1fc6 | 114 | |
d28bdfc5 | 115 | at91_rtc_write(AT91_RTC_TIMR, |
fe20ba70 AB |
116 | bin2bcd(tm->tm_sec) << 0 |
117 | | bin2bcd(tm->tm_min) << 8 | |
118 | | bin2bcd(tm->tm_hour) << 16); | |
788b1fc6 | 119 | |
d28bdfc5 | 120 | at91_rtc_write(AT91_RTC_CALR, |
fe20ba70 AB |
121 | bin2bcd((tm->tm_year + 1900) / 100) /* century */ |
122 | | bin2bcd(tm->tm_year % 100) << 8 /* year */ | |
123 | | bin2bcd(tm->tm_mon + 1) << 16 /* tm_mon starts at zero */ | |
124 | | bin2bcd(tm->tm_wday + 1) << 21 /* day of the week [0-6], Sunday=0 */ | |
125 | | bin2bcd(tm->tm_mday) << 24); | |
788b1fc6 AV |
126 | |
127 | /* Restart Time/Calendar */ | |
d28bdfc5 JCPV |
128 | cr = at91_rtc_read(AT91_RTC_CR); |
129 | at91_rtc_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL | AT91_RTC_UPDTIM)); | |
788b1fc6 AV |
130 | |
131 | return 0; | |
132 | } | |
133 | ||
134 | /* | |
135 | * Read alarm time and date in RTC | |
136 | */ | |
137 | static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm) | |
138 | { | |
139 | struct rtc_time *tm = &alrm->time; | |
140 | ||
141 | at91_rtc_decodetime(AT91_RTC_TIMALR, AT91_RTC_CALALR, tm); | |
142 | tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year); | |
143 | tm->tm_year = at91_alarm_year - 1900; | |
144 | ||
d28bdfc5 | 145 | alrm->enabled = (at91_rtc_read(AT91_RTC_IMR) & AT91_RTC_ALARM) |
a2db8dfc DB |
146 | ? 1 : 0; |
147 | ||
2a4e2b87 | 148 | pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
e7a8bb12 AM |
149 | 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, |
150 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
788b1fc6 AV |
151 | |
152 | return 0; | |
153 | } | |
154 | ||
155 | /* | |
156 | * Set alarm time and date in RTC | |
157 | */ | |
158 | static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) | |
159 | { | |
160 | struct rtc_time tm; | |
161 | ||
162 | at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, &tm); | |
163 | ||
164 | at91_alarm_year = tm.tm_year; | |
165 | ||
166 | tm.tm_hour = alrm->time.tm_hour; | |
167 | tm.tm_min = alrm->time.tm_min; | |
168 | tm.tm_sec = alrm->time.tm_sec; | |
169 | ||
d28bdfc5 JCPV |
170 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM); |
171 | at91_rtc_write(AT91_RTC_TIMALR, | |
fe20ba70 AB |
172 | bin2bcd(tm.tm_sec) << 0 |
173 | | bin2bcd(tm.tm_min) << 8 | |
174 | | bin2bcd(tm.tm_hour) << 16 | |
788b1fc6 | 175 | | AT91_RTC_HOUREN | AT91_RTC_MINEN | AT91_RTC_SECEN); |
d28bdfc5 | 176 | at91_rtc_write(AT91_RTC_CALALR, |
fe20ba70 AB |
177 | bin2bcd(tm.tm_mon + 1) << 16 /* tm_mon starts at zero */ |
178 | | bin2bcd(tm.tm_mday) << 24 | |
788b1fc6 AV |
179 | | AT91_RTC_DATEEN | AT91_RTC_MTHEN); |
180 | ||
449321b3 | 181 | if (alrm->enabled) { |
d28bdfc5 JCPV |
182 | at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM); |
183 | at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM); | |
449321b3 | 184 | } |
5d4675a8 | 185 | |
2a4e2b87 | 186 | pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
e7a8bb12 AM |
187 | at91_alarm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour, |
188 | tm.tm_min, tm.tm_sec); | |
788b1fc6 AV |
189 | |
190 | return 0; | |
191 | } | |
192 | ||
16380c15 JS |
193 | static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) |
194 | { | |
195 | pr_debug("%s(): cmd=%08x\n", __func__, enabled); | |
196 | ||
197 | if (enabled) { | |
d28bdfc5 JCPV |
198 | at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM); |
199 | at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM); | |
16380c15 | 200 | } else |
d28bdfc5 | 201 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM); |
16380c15 JS |
202 | |
203 | return 0; | |
204 | } | |
788b1fc6 AV |
205 | /* |
206 | * Provide additional RTC information in /proc/driver/rtc | |
207 | */ | |
208 | static int at91_rtc_proc(struct device *dev, struct seq_file *seq) | |
209 | { | |
d28bdfc5 | 210 | unsigned long imr = at91_rtc_read(AT91_RTC_IMR); |
788b1fc6 | 211 | |
e7a8bb12 AM |
212 | seq_printf(seq, "update_IRQ\t: %s\n", |
213 | (imr & AT91_RTC_ACKUPD) ? "yes" : "no"); | |
214 | seq_printf(seq, "periodic_IRQ\t: %s\n", | |
215 | (imr & AT91_RTC_SECEV) ? "yes" : "no"); | |
788b1fc6 AV |
216 | |
217 | return 0; | |
218 | } | |
219 | ||
220 | /* | |
221 | * IRQ handler for the RTC | |
222 | */ | |
7d12e780 | 223 | static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id) |
788b1fc6 | 224 | { |
e7a8bb12 | 225 | struct platform_device *pdev = dev_id; |
788b1fc6 AV |
226 | struct rtc_device *rtc = platform_get_drvdata(pdev); |
227 | unsigned int rtsr; | |
228 | unsigned long events = 0; | |
229 | ||
d28bdfc5 | 230 | rtsr = at91_rtc_read(AT91_RTC_SR) & at91_rtc_read(AT91_RTC_IMR); |
788b1fc6 AV |
231 | if (rtsr) { /* this interrupt is shared! Is it ours? */ |
232 | if (rtsr & AT91_RTC_ALARM) | |
233 | events |= (RTC_AF | RTC_IRQF); | |
234 | if (rtsr & AT91_RTC_SECEV) | |
235 | events |= (RTC_UF | RTC_IRQF); | |
236 | if (rtsr & AT91_RTC_ACKUPD) | |
237 | complete(&at91_rtc_updated); | |
238 | ||
d28bdfc5 | 239 | at91_rtc_write(AT91_RTC_SCCR, rtsr); /* clear status reg */ |
788b1fc6 | 240 | |
ab6a2d70 | 241 | rtc_update_irq(rtc, 1, events); |
788b1fc6 | 242 | |
2a4e2b87 | 243 | pr_debug("%s(): num=%ld, events=0x%02lx\n", __func__, |
788b1fc6 AV |
244 | events >> 8, events & 0x000000FF); |
245 | ||
246 | return IRQ_HANDLED; | |
247 | } | |
248 | return IRQ_NONE; /* not handled */ | |
249 | } | |
250 | ||
ff8371ac | 251 | static const struct rtc_class_ops at91_rtc_ops = { |
788b1fc6 AV |
252 | .read_time = at91_rtc_readtime, |
253 | .set_time = at91_rtc_settime, | |
254 | .read_alarm = at91_rtc_readalarm, | |
255 | .set_alarm = at91_rtc_setalarm, | |
256 | .proc = at91_rtc_proc, | |
16380c15 | 257 | .alarm_irq_enable = at91_rtc_alarm_irq_enable, |
788b1fc6 AV |
258 | }; |
259 | ||
260 | /* | |
261 | * Initialize and install RTC driver | |
262 | */ | |
263 | static int __init at91_rtc_probe(struct platform_device *pdev) | |
264 | { | |
265 | struct rtc_device *rtc; | |
d28bdfc5 JCPV |
266 | struct resource *regs; |
267 | int ret = 0; | |
788b1fc6 | 268 | |
d28bdfc5 JCPV |
269 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
270 | if (!regs) { | |
271 | dev_err(&pdev->dev, "no mmio resource defined\n"); | |
272 | return -ENXIO; | |
273 | } | |
274 | ||
275 | irq = platform_get_irq(pdev, 0); | |
276 | if (irq < 0) { | |
277 | dev_err(&pdev->dev, "no irq resource defined\n"); | |
278 | return -ENXIO; | |
279 | } | |
280 | ||
281 | at91_rtc_regs = ioremap(regs->start, resource_size(regs)); | |
282 | if (!at91_rtc_regs) { | |
283 | dev_err(&pdev->dev, "failed to map registers, aborting.\n"); | |
284 | return -ENOMEM; | |
285 | } | |
286 | ||
287 | at91_rtc_write(AT91_RTC_CR, 0); | |
288 | at91_rtc_write(AT91_RTC_MR, 0); /* 24 hour mode */ | |
788b1fc6 AV |
289 | |
290 | /* Disable all interrupts */ | |
d28bdfc5 | 291 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM | |
e7a8bb12 AM |
292 | AT91_RTC_SECEV | AT91_RTC_TIMEV | |
293 | AT91_RTC_CALEV); | |
788b1fc6 | 294 | |
d28bdfc5 | 295 | ret = request_irq(irq, at91_rtc_interrupt, |
dac94d9e | 296 | IRQF_SHARED, |
d728b1e6 | 297 | "at91_rtc", pdev); |
788b1fc6 | 298 | if (ret) { |
e7a8bb12 | 299 | printk(KERN_ERR "at91_rtc: IRQ %d already in use.\n", |
d28bdfc5 | 300 | irq); |
788b1fc6 AV |
301 | return ret; |
302 | } | |
303 | ||
5d4675a8 DB |
304 | /* cpu init code should really have flagged this device as |
305 | * being wake-capable; if it didn't, do that here. | |
306 | */ | |
307 | if (!device_can_wakeup(&pdev->dev)) | |
308 | device_init_wakeup(&pdev->dev, 1); | |
309 | ||
e7a8bb12 AM |
310 | rtc = rtc_device_register(pdev->name, &pdev->dev, |
311 | &at91_rtc_ops, THIS_MODULE); | |
788b1fc6 | 312 | if (IS_ERR(rtc)) { |
d28bdfc5 | 313 | free_irq(irq, pdev); |
788b1fc6 AV |
314 | return PTR_ERR(rtc); |
315 | } | |
316 | platform_set_drvdata(pdev, rtc); | |
317 | ||
318 | printk(KERN_INFO "AT91 Real Time Clock driver.\n"); | |
319 | return 0; | |
320 | } | |
321 | ||
322 | /* | |
323 | * Disable and remove the RTC driver | |
324 | */ | |
5d4675a8 | 325 | static int __exit at91_rtc_remove(struct platform_device *pdev) |
788b1fc6 AV |
326 | { |
327 | struct rtc_device *rtc = platform_get_drvdata(pdev); | |
328 | ||
329 | /* Disable all interrupts */ | |
d28bdfc5 | 330 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM | |
e7a8bb12 AM |
331 | AT91_RTC_SECEV | AT91_RTC_TIMEV | |
332 | AT91_RTC_CALEV); | |
d28bdfc5 | 333 | free_irq(irq, pdev); |
788b1fc6 AV |
334 | |
335 | rtc_device_unregister(rtc); | |
336 | platform_set_drvdata(pdev, NULL); | |
337 | ||
338 | return 0; | |
339 | } | |
340 | ||
341 | #ifdef CONFIG_PM | |
342 | ||
343 | /* AT91RM9200 RTC Power management control */ | |
344 | ||
90b4d648 | 345 | static u32 at91_rtc_imr; |
788b1fc6 | 346 | |
dac94d9e | 347 | static int at91_rtc_suspend(struct device *dev) |
788b1fc6 | 348 | { |
90b4d648 DB |
349 | /* this IRQ is shared with DBGU and other hardware which isn't |
350 | * necessarily doing PM like we are... | |
351 | */ | |
d28bdfc5 | 352 | at91_rtc_imr = at91_rtc_read(AT91_RTC_IMR) |
90b4d648 DB |
353 | & (AT91_RTC_ALARM|AT91_RTC_SECEV); |
354 | if (at91_rtc_imr) { | |
dac94d9e | 355 | if (device_may_wakeup(dev)) |
d28bdfc5 | 356 | enable_irq_wake(irq); |
90b4d648 | 357 | else |
d28bdfc5 | 358 | at91_rtc_write(AT91_RTC_IDR, at91_rtc_imr); |
90b4d648 | 359 | } |
788b1fc6 AV |
360 | return 0; |
361 | } | |
362 | ||
dac94d9e | 363 | static int at91_rtc_resume(struct device *dev) |
788b1fc6 | 364 | { |
90b4d648 | 365 | if (at91_rtc_imr) { |
dac94d9e | 366 | if (device_may_wakeup(dev)) |
d28bdfc5 | 367 | disable_irq_wake(irq); |
90b4d648 | 368 | else |
d28bdfc5 | 369 | at91_rtc_write(AT91_RTC_IER, at91_rtc_imr); |
90b4d648 | 370 | } |
788b1fc6 AV |
371 | return 0; |
372 | } | |
dac94d9e DB |
373 | |
374 | static const struct dev_pm_ops at91_rtc_pm = { | |
375 | .suspend = at91_rtc_suspend, | |
376 | .resume = at91_rtc_resume, | |
377 | }; | |
378 | ||
379 | #define at91_rtc_pm_ptr &at91_rtc_pm | |
380 | ||
788b1fc6 | 381 | #else |
dac94d9e | 382 | #define at91_rtc_pm_ptr NULL |
788b1fc6 AV |
383 | #endif |
384 | ||
385 | static struct platform_driver at91_rtc_driver = { | |
5d4675a8 | 386 | .remove = __exit_p(at91_rtc_remove), |
788b1fc6 AV |
387 | .driver = { |
388 | .name = "at91_rtc", | |
389 | .owner = THIS_MODULE, | |
dac94d9e | 390 | .pm = at91_rtc_pm_ptr, |
788b1fc6 AV |
391 | }, |
392 | }; | |
393 | ||
394 | static int __init at91_rtc_init(void) | |
395 | { | |
5d4675a8 | 396 | return platform_driver_probe(&at91_rtc_driver, at91_rtc_probe); |
788b1fc6 AV |
397 | } |
398 | ||
399 | static void __exit at91_rtc_exit(void) | |
400 | { | |
401 | platform_driver_unregister(&at91_rtc_driver); | |
402 | } | |
403 | ||
788b1fc6 AV |
404 | module_init(at91_rtc_init); |
405 | module_exit(at91_rtc_exit); | |
406 | ||
407 | MODULE_AUTHOR("Rick Bronson"); | |
408 | MODULE_DESCRIPTION("RTC driver for Atmel AT91RM9200"); | |
409 | MODULE_LICENSE("GPL"); | |
ad28a07b | 410 | MODULE_ALIAS("platform:at91_rtc"); |