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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 | #include <linux/io.h> |
31 | |
32 | #include <asm/uaccess.h> |
33 | |
34 | #include "rtc-at91rm9200.h" |
35 | |
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) |
40 | |
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; |
45 | static void __iomem *at91_rtc_regs; |
46 | static int irq; |
47 | |
48 | /* |
49 | * Decode time/date into rtc_time structure |
50 | */ |
51 | static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg, |
52 | struct rtc_time *tm) |
53 | { |
54 | unsigned int time, date; |
55 | |
56 | /* must read twice in case it changes */ |
57 | do { |
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))); |
62 | |
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); |
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 |
70 | * alarm is set, at91_alarm_year will store the current year. |
71 | */ |
72 | tm->tm_year = bcd2bin(date & AT91_RTC_CENT) * 100; /* century */ |
73 | tm->tm_year += bcd2bin((date & AT91_RTC_YEAR) >> 8); /* year */ |
74 | |
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); |
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 | |
89 | dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
90 | 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, |
91 | tm->tm_hour, tm->tm_min, tm->tm_sec); |
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 | |
103 | dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
104 | 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, |
105 | tm->tm_hour, tm->tm_min, tm->tm_sec); |
106 | |
107 | /* Stop Time/Calendar from counting */ |
108 | cr = at91_rtc_read(AT91_RTC_CR); |
109 | at91_rtc_write(AT91_RTC_CR, cr | AT91_RTC_UPDCAL | AT91_RTC_UPDTIM); |
110 | |
111 | at91_rtc_write(AT91_RTC_IER, AT91_RTC_ACKUPD); |
112 | wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */ |
113 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD); |
114 | |
115 | at91_rtc_write(AT91_RTC_TIMR, |
116 | bin2bcd(tm->tm_sec) << 0 |
117 | | bin2bcd(tm->tm_min) << 8 |
118 | | bin2bcd(tm->tm_hour) << 16); |
119 | |
120 | at91_rtc_write(AT91_RTC_CALR, |
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); |
126 | |
127 | /* Restart Time/Calendar */ |
128 | cr = at91_rtc_read(AT91_RTC_CR); |
129 | at91_rtc_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL | AT91_RTC_UPDTIM)); |
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 | |
145 | alrm->enabled = (at91_rtc_read(AT91_RTC_IMR) & AT91_RTC_ALARM) |
146 | ? 1 : 0; |
147 | |
148 | dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
149 | 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, |
150 | tm->tm_hour, tm->tm_min, tm->tm_sec); |
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 | |
170 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM); |
171 | at91_rtc_write(AT91_RTC_TIMALR, |
172 | bin2bcd(tm.tm_sec) << 0 |
173 | | bin2bcd(tm.tm_min) << 8 |
174 | | bin2bcd(tm.tm_hour) << 16 |
175 | | AT91_RTC_HOUREN | AT91_RTC_MINEN | AT91_RTC_SECEN); |
176 | at91_rtc_write(AT91_RTC_CALALR, |
177 | bin2bcd(tm.tm_mon + 1) << 16 /* tm_mon starts at zero */ |
178 | | bin2bcd(tm.tm_mday) << 24 |
179 | | AT91_RTC_DATEEN | AT91_RTC_MTHEN); |
180 | |
181 | if (alrm->enabled) { |
182 | at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM); |
183 | at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM); |
184 | } |
185 | |
186 | dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
187 | at91_alarm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour, |
188 | tm.tm_min, tm.tm_sec); |
189 | |
190 | return 0; |
191 | } |
192 | |
193 | static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) |
194 | { |
195 | dev_dbg(dev, "%s(): cmd=%08x\n", __func__, enabled); |
196 | |
197 | if (enabled) { |
198 | at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM); |
199 | at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM); |
200 | } else |
201 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM); |
202 | |
203 | return 0; |
204 | } |
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 | { |
210 | unsigned long imr = at91_rtc_read(AT91_RTC_IMR); |
211 | |
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"); |
216 | |
217 | return 0; |
218 | } |
219 | |
220 | /* |
221 | * IRQ handler for the RTC |
222 | */ |
223 | static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id) |
224 | { |
225 | struct platform_device *pdev = dev_id; |
226 | struct rtc_device *rtc = platform_get_drvdata(pdev); |
227 | unsigned int rtsr; |
228 | unsigned long events = 0; |
229 | |
230 | rtsr = at91_rtc_read(AT91_RTC_SR) & at91_rtc_read(AT91_RTC_IMR); |
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 | |
239 | at91_rtc_write(AT91_RTC_SCCR, rtsr); /* clear status reg */ |
240 | |
241 | rtc_update_irq(rtc, 1, events); |
242 | |
243 | dev_dbg(&pdev->dev, "%s(): num=%ld, events=0x%02lx\n", __func__, |
244 | events >> 8, events & 0x000000FF); |
245 | |
246 | return IRQ_HANDLED; |
247 | } |
248 | return IRQ_NONE; /* not handled */ |
249 | } |
250 | |
251 | static const struct rtc_class_ops at91_rtc_ops = { |
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, |
257 | .alarm_irq_enable = at91_rtc_alarm_irq_enable, |
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; |
266 | struct resource *regs; |
267 | int ret = 0; |
268 | |
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 */ |
289 | |
290 | /* Disable all interrupts */ |
291 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM | |
292 | AT91_RTC_SECEV | AT91_RTC_TIMEV | |
293 | AT91_RTC_CALEV); |
294 | |
295 | ret = request_irq(irq, at91_rtc_interrupt, |
296 | IRQF_SHARED, |
297 | "at91_rtc", pdev); |
298 | if (ret) { |
299 | dev_err(&pdev->dev, "IRQ %d already in use.\n", irq); |
300 | return ret; |
301 | } |
302 | |
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 | |
309 | rtc = rtc_device_register(pdev->name, &pdev->dev, |
310 | &at91_rtc_ops, THIS_MODULE); |
311 | if (IS_ERR(rtc)) { |
312 | free_irq(irq, pdev); |
313 | return PTR_ERR(rtc); |
314 | } |
315 | platform_set_drvdata(pdev, rtc); |
316 | |
317 | dev_info(&pdev->dev, "AT91 Real Time Clock driver.\n"); |
318 | return 0; |
319 | } |
320 | |
321 | /* |
322 | * Disable and remove the RTC driver |
323 | */ |
324 | static int __exit at91_rtc_remove(struct platform_device *pdev) |
325 | { |
326 | struct rtc_device *rtc = platform_get_drvdata(pdev); |
327 | |
328 | /* Disable all interrupts */ |
329 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM | |
330 | AT91_RTC_SECEV | AT91_RTC_TIMEV | |
331 | AT91_RTC_CALEV); |
332 | free_irq(irq, pdev); |
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 | |
344 | static u32 at91_rtc_imr; |
345 | |
346 | static int at91_rtc_suspend(struct device *dev) |
347 | { |
348 | /* this IRQ is shared with DBGU and other hardware which isn't |
349 | * necessarily doing PM like we are... |
350 | */ |
351 | at91_rtc_imr = at91_rtc_read(AT91_RTC_IMR) |
352 | & (AT91_RTC_ALARM|AT91_RTC_SECEV); |
353 | if (at91_rtc_imr) { |
354 | if (device_may_wakeup(dev)) |
355 | enable_irq_wake(irq); |
356 | else |
357 | at91_rtc_write(AT91_RTC_IDR, at91_rtc_imr); |
358 | } |
359 | return 0; |
360 | } |
361 | |
362 | static int at91_rtc_resume(struct device *dev) |
363 | { |
364 | if (at91_rtc_imr) { |
365 | if (device_may_wakeup(dev)) |
366 | disable_irq_wake(irq); |
367 | else |
368 | at91_rtc_write(AT91_RTC_IER, at91_rtc_imr); |
369 | } |
370 | return 0; |
371 | } |
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 | |
380 | #else |
381 | #define at91_rtc_pm_ptr NULL |
382 | #endif |
383 | |
384 | static struct platform_driver at91_rtc_driver = { |
385 | .remove = __exit_p(at91_rtc_remove), |
386 | .driver = { |
387 | .name = "at91_rtc", |
388 | .owner = THIS_MODULE, |
389 | .pm = at91_rtc_pm_ptr, |
390 | }, |
391 | }; |
392 | |
393 | static int __init at91_rtc_init(void) |
394 | { |
395 | return platform_driver_probe(&at91_rtc_driver, at91_rtc_probe); |
396 | } |
397 | |
398 | static void __exit at91_rtc_exit(void) |
399 | { |
400 | platform_driver_unregister(&at91_rtc_driver); |
401 | } |
402 | |
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"); |
409 | MODULE_ALIAS("platform:at91_rtc"); |
410 |
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