firmware: export firmware_kset so that people can use that instead of the braindead...
[linux-2.6] / drivers / rtc / rtc-at91rm9200.c
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 #include <asm/rtc.h>
33
34 #include <asm/mach/time.h>
35
36 #include <asm/arch/at91_rtc.h>
37
38
39 #define AT91_RTC_FREQ           1
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;
44
45 /*
46  * Decode time/date into rtc_time structure
47  */
48 static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg,
49                                 struct rtc_time *tm)
50 {
51         unsigned int time, date;
52
53         /* must read twice in case it changes */
54         do {
55                 time = at91_sys_read(timereg);
56                 date = at91_sys_read(calreg);
57         } while ((time != at91_sys_read(timereg)) ||
58                         (date != at91_sys_read(calreg)));
59
60         tm->tm_sec  = BCD2BIN((time & AT91_RTC_SEC) >> 0);
61         tm->tm_min  = BCD2BIN((time & AT91_RTC_MIN) >> 8);
62         tm->tm_hour = BCD2BIN((time & AT91_RTC_HOUR) >> 16);
63
64         /*
65          * The Calendar Alarm register does not have a field for
66          * the year - so these will return an invalid value.  When an
67          * alarm is set, at91_alarm_year wille store the current year.
68          */
69         tm->tm_year  = BCD2BIN(date & AT91_RTC_CENT) * 100;     /* century */
70         tm->tm_year += BCD2BIN((date & AT91_RTC_YEAR) >> 8);    /* year */
71
72         tm->tm_wday = BCD2BIN((date & AT91_RTC_DAY) >> 21) - 1; /* day of the week [0-6], Sunday=0 */
73         tm->tm_mon  = BCD2BIN((date & AT91_RTC_MONTH) >> 16) - 1;
74         tm->tm_mday = BCD2BIN((date & AT91_RTC_DATE) >> 24);
75 }
76
77 /*
78  * Read current time and date in RTC
79  */
80 static int at91_rtc_readtime(struct device *dev, struct rtc_time *tm)
81 {
82         at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, tm);
83         tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
84         tm->tm_year = tm->tm_year - 1900;
85
86         pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
87                 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
88                 tm->tm_hour, tm->tm_min, tm->tm_sec);
89
90         return 0;
91 }
92
93 /*
94  * Set current time and date in RTC
95  */
96 static int at91_rtc_settime(struct device *dev, struct rtc_time *tm)
97 {
98         unsigned long cr;
99
100         pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
101                 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
102                 tm->tm_hour, tm->tm_min, tm->tm_sec);
103
104         /* Stop Time/Calendar from counting */
105         cr = at91_sys_read(AT91_RTC_CR);
106         at91_sys_write(AT91_RTC_CR, cr | AT91_RTC_UPDCAL | AT91_RTC_UPDTIM);
107
108         at91_sys_write(AT91_RTC_IER, AT91_RTC_ACKUPD);
109         wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */
110         at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD);
111
112         at91_sys_write(AT91_RTC_TIMR,
113                           BIN2BCD(tm->tm_sec) << 0
114                         | BIN2BCD(tm->tm_min) << 8
115                         | BIN2BCD(tm->tm_hour) << 16);
116
117         at91_sys_write(AT91_RTC_CALR,
118                           BIN2BCD((tm->tm_year + 1900) / 100)   /* century */
119                         | BIN2BCD(tm->tm_year % 100) << 8       /* year */
120                         | BIN2BCD(tm->tm_mon + 1) << 16         /* tm_mon starts at zero */
121                         | BIN2BCD(tm->tm_wday + 1) << 21        /* day of the week [0-6], Sunday=0 */
122                         | BIN2BCD(tm->tm_mday) << 24);
123
124         /* Restart Time/Calendar */
125         cr = at91_sys_read(AT91_RTC_CR);
126         at91_sys_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL | AT91_RTC_UPDTIM));
127
128         return 0;
129 }
130
131 /*
132  * Read alarm time and date in RTC
133  */
134 static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
135 {
136         struct rtc_time *tm = &alrm->time;
137
138         at91_rtc_decodetime(AT91_RTC_TIMALR, AT91_RTC_CALALR, tm);
139         tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
140         tm->tm_year = at91_alarm_year - 1900;
141
142         alrm->enabled = (at91_sys_read(AT91_RTC_IMR) & AT91_RTC_ALARM)
143                         ? 1 : 0;
144
145         pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
146                 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
147                 tm->tm_hour, tm->tm_min, tm->tm_sec);
148
149         return 0;
150 }
151
152 /*
153  * Set alarm time and date in RTC
154  */
155 static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
156 {
157         struct rtc_time tm;
158
159         at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, &tm);
160
161         at91_alarm_year = tm.tm_year;
162
163         tm.tm_hour = alrm->time.tm_hour;
164         tm.tm_min = alrm->time.tm_min;
165         tm.tm_sec = alrm->time.tm_sec;
166
167         at91_sys_write(AT91_RTC_IDR, AT91_RTC_ALARM);
168         at91_sys_write(AT91_RTC_TIMALR,
169                   BIN2BCD(tm.tm_sec) << 0
170                 | BIN2BCD(tm.tm_min) << 8
171                 | BIN2BCD(tm.tm_hour) << 16
172                 | AT91_RTC_HOUREN | AT91_RTC_MINEN | AT91_RTC_SECEN);
173         at91_sys_write(AT91_RTC_CALALR,
174                   BIN2BCD(tm.tm_mon + 1) << 16          /* tm_mon starts at zero */
175                 | BIN2BCD(tm.tm_mday) << 24
176                 | AT91_RTC_DATEEN | AT91_RTC_MTHEN);
177
178         if (alrm->enabled)
179                 at91_sys_write(AT91_RTC_IER, AT91_RTC_ALARM);
180
181         pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
182                 at91_alarm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour,
183                 tm.tm_min, tm.tm_sec);
184
185         return 0;
186 }
187
188 /*
189  * Handle commands from user-space
190  */
191 static int at91_rtc_ioctl(struct device *dev, unsigned int cmd,
192                         unsigned long arg)
193 {
194         int ret = 0;
195
196         pr_debug("%s(): cmd=%08x, arg=%08lx.\n", __FUNCTION__, cmd, arg);
197
198         switch (cmd) {
199         case RTC_AIE_OFF:       /* alarm off */
200                 at91_sys_write(AT91_RTC_IDR, AT91_RTC_ALARM);
201                 break;
202         case RTC_AIE_ON:        /* alarm on */
203                 at91_sys_write(AT91_RTC_IER, AT91_RTC_ALARM);
204                 break;
205         case RTC_UIE_OFF:       /* update off */
206         case RTC_PIE_OFF:       /* periodic off */
207                 at91_sys_write(AT91_RTC_IDR, AT91_RTC_SECEV);
208                 break;
209         case RTC_UIE_ON:        /* update on */
210         case RTC_PIE_ON:        /* periodic on */
211                 at91_sys_write(AT91_RTC_IER, AT91_RTC_SECEV);
212                 break;
213         case RTC_IRQP_READ:     /* read periodic alarm frequency */
214                 ret = put_user(AT91_RTC_FREQ, (unsigned long *) arg);
215                 break;
216         case RTC_IRQP_SET:      /* set periodic alarm frequency */
217                 if (arg != AT91_RTC_FREQ)
218                         ret = -EINVAL;
219                 break;
220         default:
221                 ret = -ENOIOCTLCMD;
222                 break;
223         }
224
225         return ret;
226 }
227
228 /*
229  * Provide additional RTC information in /proc/driver/rtc
230  */
231 static int at91_rtc_proc(struct device *dev, struct seq_file *seq)
232 {
233         unsigned long imr = at91_sys_read(AT91_RTC_IMR);
234
235         seq_printf(seq, "update_IRQ\t: %s\n",
236                         (imr & AT91_RTC_ACKUPD) ? "yes" : "no");
237         seq_printf(seq, "periodic_IRQ\t: %s\n",
238                         (imr & AT91_RTC_SECEV) ? "yes" : "no");
239         seq_printf(seq, "periodic_freq\t: %ld\n",
240                         (unsigned long) AT91_RTC_FREQ);
241
242         return 0;
243 }
244
245 /*
246  * IRQ handler for the RTC
247  */
248 static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id)
249 {
250         struct platform_device *pdev = dev_id;
251         struct rtc_device *rtc = platform_get_drvdata(pdev);
252         unsigned int rtsr;
253         unsigned long events = 0;
254
255         rtsr = at91_sys_read(AT91_RTC_SR) & at91_sys_read(AT91_RTC_IMR);
256         if (rtsr) {             /* this interrupt is shared!  Is it ours? */
257                 if (rtsr & AT91_RTC_ALARM)
258                         events |= (RTC_AF | RTC_IRQF);
259                 if (rtsr & AT91_RTC_SECEV)
260                         events |= (RTC_UF | RTC_IRQF);
261                 if (rtsr & AT91_RTC_ACKUPD)
262                         complete(&at91_rtc_updated);
263
264                 at91_sys_write(AT91_RTC_SCCR, rtsr);    /* clear status reg */
265
266                 rtc_update_irq(rtc, 1, events);
267
268                 pr_debug("%s(): num=%ld, events=0x%02lx\n", __FUNCTION__,
269                         events >> 8, events & 0x000000FF);
270
271                 return IRQ_HANDLED;
272         }
273         return IRQ_NONE;                /* not handled */
274 }
275
276 static const struct rtc_class_ops at91_rtc_ops = {
277         .ioctl          = at91_rtc_ioctl,
278         .read_time      = at91_rtc_readtime,
279         .set_time       = at91_rtc_settime,
280         .read_alarm     = at91_rtc_readalarm,
281         .set_alarm      = at91_rtc_setalarm,
282         .proc           = at91_rtc_proc,
283 };
284
285 /*
286  * Initialize and install RTC driver
287  */
288 static int __init at91_rtc_probe(struct platform_device *pdev)
289 {
290         struct rtc_device *rtc;
291         int ret;
292
293         at91_sys_write(AT91_RTC_CR, 0);
294         at91_sys_write(AT91_RTC_MR, 0);         /* 24 hour mode */
295
296         /* Disable all interrupts */
297         at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
298                                         AT91_RTC_SECEV | AT91_RTC_TIMEV |
299                                         AT91_RTC_CALEV);
300
301         ret = request_irq(AT91_ID_SYS, at91_rtc_interrupt,
302                                 IRQF_DISABLED | IRQF_SHARED,
303                                 "at91_rtc", pdev);
304         if (ret) {
305                 printk(KERN_ERR "at91_rtc: IRQ %d already in use.\n",
306                                 AT91_ID_SYS);
307                 return ret;
308         }
309
310         /* cpu init code should really have flagged this device as
311          * being wake-capable; if it didn't, do that here.
312          */
313         if (!device_can_wakeup(&pdev->dev))
314                 device_init_wakeup(&pdev->dev, 1);
315
316         rtc = rtc_device_register(pdev->name, &pdev->dev,
317                                 &at91_rtc_ops, THIS_MODULE);
318         if (IS_ERR(rtc)) {
319                 free_irq(AT91_ID_SYS, pdev);
320                 return PTR_ERR(rtc);
321         }
322         platform_set_drvdata(pdev, rtc);
323
324         printk(KERN_INFO "AT91 Real Time Clock driver.\n");
325         return 0;
326 }
327
328 /*
329  * Disable and remove the RTC driver
330  */
331 static int __exit at91_rtc_remove(struct platform_device *pdev)
332 {
333         struct rtc_device *rtc = platform_get_drvdata(pdev);
334
335         /* Disable all interrupts */
336         at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
337                                         AT91_RTC_SECEV | AT91_RTC_TIMEV |
338                                         AT91_RTC_CALEV);
339         free_irq(AT91_ID_SYS, pdev);
340
341         rtc_device_unregister(rtc);
342         platform_set_drvdata(pdev, NULL);
343
344         return 0;
345 }
346
347 #ifdef CONFIG_PM
348
349 /* AT91RM9200 RTC Power management control */
350
351 static u32 at91_rtc_imr;
352
353 static int at91_rtc_suspend(struct platform_device *pdev, pm_message_t state)
354 {
355         /* this IRQ is shared with DBGU and other hardware which isn't
356          * necessarily doing PM like we are...
357          */
358         at91_rtc_imr = at91_sys_read(AT91_RTC_IMR)
359                         & (AT91_RTC_ALARM|AT91_RTC_SECEV);
360         if (at91_rtc_imr) {
361                 if (device_may_wakeup(&pdev->dev))
362                         enable_irq_wake(AT91_ID_SYS);
363                 else
364                         at91_sys_write(AT91_RTC_IDR, at91_rtc_imr);
365         }
366         return 0;
367 }
368
369 static int at91_rtc_resume(struct platform_device *pdev)
370 {
371         if (at91_rtc_imr) {
372                 if (device_may_wakeup(&pdev->dev))
373                         disable_irq_wake(AT91_ID_SYS);
374                 else
375                         at91_sys_write(AT91_RTC_IER, at91_rtc_imr);
376         }
377         return 0;
378 }
379 #else
380 #define at91_rtc_suspend NULL
381 #define at91_rtc_resume  NULL
382 #endif
383
384 static struct platform_driver at91_rtc_driver = {
385         .remove         = __exit_p(at91_rtc_remove),
386         .suspend        = at91_rtc_suspend,
387         .resume         = at91_rtc_resume,
388         .driver         = {
389                 .name   = "at91_rtc",
390                 .owner  = THIS_MODULE,
391         },
392 };
393
394 static int __init at91_rtc_init(void)
395 {
396         return platform_driver_probe(&at91_rtc_driver, at91_rtc_probe);
397 }
398
399 static void __exit at91_rtc_exit(void)
400 {
401         platform_driver_unregister(&at91_rtc_driver);
402 }
403
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");