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Ben Dooks1add6782006-07-01 04:36:26 -07001/* drivers/rtc/rtc-s3c.c
2 *
3 * Copyright (c) 2004,2006 Simtec Electronics
4 * Ben Dooks, <ben@simtec.co.uk>
5 * http://armlinux.simtec.co.uk/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * S3C2410/S3C2440/S3C24XX Internal RTC Driver
12*/
13
14#include <linux/module.h>
15#include <linux/fs.h>
16#include <linux/string.h>
17#include <linux/init.h>
18#include <linux/platform_device.h>
19#include <linux/interrupt.h>
20#include <linux/rtc.h>
21#include <linux/bcd.h>
22#include <linux/clk.h>
Robert P. J. Day9974b6e2008-02-06 01:38:42 -080023#include <linux/log2.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090024#include <linux/slab.h>
Ben Dooks1add6782006-07-01 04:36:26 -070025
Russell Kinga09e64f2008-08-05 16:14:15 +010026#include <mach/hardware.h>
Ben Dooks1add6782006-07-01 04:36:26 -070027#include <asm/uaccess.h>
28#include <asm/io.h>
29#include <asm/irq.h>
Ben Dookse2cd00c2008-10-30 10:14:34 +000030#include <plat/regs-rtc.h>
Ben Dooks1add6782006-07-01 04:36:26 -070031
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -070032enum s3c_cpu_type {
33 TYPE_S3C2410,
34 TYPE_S3C64XX,
35};
36
Ben Dooks1add6782006-07-01 04:36:26 -070037/* I have yet to find an S3C implementation with more than one
38 * of these rtc blocks in */
39
40static struct resource *s3c_rtc_mem;
41
42static void __iomem *s3c_rtc_base;
43static int s3c_rtc_alarmno = NO_IRQ;
44static int s3c_rtc_tickno = NO_IRQ;
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -070045static enum s3c_cpu_type s3c_rtc_cpu_type;
Ben Dooks1add6782006-07-01 04:36:26 -070046
47static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
Ben Dooks1add6782006-07-01 04:36:26 -070048
49/* IRQ Handlers */
50
David Howells7d12e782006-10-05 14:55:46 +010051static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
Ben Dooks1add6782006-07-01 04:36:26 -070052{
53 struct rtc_device *rdev = id;
54
David Brownellab6a2d72007-05-08 00:33:30 -070055 rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
Ben Dooks1add6782006-07-01 04:36:26 -070056 return IRQ_HANDLED;
57}
58
David Howells7d12e782006-10-05 14:55:46 +010059static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
Ben Dooks1add6782006-07-01 04:36:26 -070060{
61 struct rtc_device *rdev = id;
62
Ben Dooks773be7e2008-07-23 21:30:45 -070063 rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
Ben Dooks1add6782006-07-01 04:36:26 -070064 return IRQ_HANDLED;
65}
66
67/* Update control registers */
68static void s3c_rtc_setaie(int to)
69{
70 unsigned int tmp;
71
Harvey Harrison2a4e2b82008-04-28 02:12:00 -070072 pr_debug("%s: aie=%d\n", __func__, to);
Ben Dooks1add6782006-07-01 04:36:26 -070073
Ben Dooks9a654512006-08-27 01:23:22 -070074 tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
Ben Dooks1add6782006-07-01 04:36:26 -070075
76 if (to)
77 tmp |= S3C2410_RTCALM_ALMEN;
78
Ben Dooks9a654512006-08-27 01:23:22 -070079 writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -070080}
81
Ben Dooks773be7e2008-07-23 21:30:45 -070082static int s3c_rtc_setpie(struct device *dev, int enabled)
Ben Dooks1add6782006-07-01 04:36:26 -070083{
84 unsigned int tmp;
85
Ben Dooks773be7e2008-07-23 21:30:45 -070086 pr_debug("%s: pie=%d\n", __func__, enabled);
Ben Dooks1add6782006-07-01 04:36:26 -070087
88 spin_lock_irq(&s3c_rtc_pie_lock);
Ben Dooks1add6782006-07-01 04:36:26 -070089
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -070090 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
91 tmp = readb(s3c_rtc_base + S3C2410_RTCCON);
92 tmp &= ~S3C64XX_RTCCON_TICEN;
Ben Dooks1add6782006-07-01 04:36:26 -070093
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -070094 if (enabled)
95 tmp |= S3C64XX_RTCCON_TICEN;
96
97 writeb(tmp, s3c_rtc_base + S3C2410_RTCCON);
98 } else {
99 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
100 tmp &= ~S3C2410_TICNT_ENABLE;
101
102 if (enabled)
103 tmp |= S3C2410_TICNT_ENABLE;
104
105 writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
106 }
107
Ben Dooks1add6782006-07-01 04:36:26 -0700108 spin_unlock_irq(&s3c_rtc_pie_lock);
Ben Dooks773be7e2008-07-23 21:30:45 -0700109
110 return 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700111}
112
Ben Dooks773be7e2008-07-23 21:30:45 -0700113static int s3c_rtc_setfreq(struct device *dev, int freq)
Ben Dooks1add6782006-07-01 04:36:26 -0700114{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700115 struct platform_device *pdev = to_platform_device(dev);
116 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
117 unsigned int tmp = 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700118
Jonathan Cameron5d2a5032009-01-06 14:42:12 -0800119 if (!is_power_of_2(freq))
120 return -EINVAL;
121
Ben Dooks1add6782006-07-01 04:36:26 -0700122 spin_lock_irq(&s3c_rtc_pie_lock);
Ben Dooks773be7e2008-07-23 21:30:45 -0700123
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700124 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
125 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
126 tmp &= S3C2410_TICNT_ENABLE;
127 }
128
129 tmp |= (rtc_dev->max_user_freq / freq)-1;
Ben Dooks1add6782006-07-01 04:36:26 -0700130
Ben Dooks9a654512006-08-27 01:23:22 -0700131 writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
Ben Dooks1add6782006-07-01 04:36:26 -0700132 spin_unlock_irq(&s3c_rtc_pie_lock);
Ben Dooks773be7e2008-07-23 21:30:45 -0700133
134 return 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700135}
136
137/* Time read/write */
138
139static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
140{
141 unsigned int have_retried = 0;
Ben Dooks9a654512006-08-27 01:23:22 -0700142 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700143
144 retry_get_time:
Ben Dooks9a654512006-08-27 01:23:22 -0700145 rtc_tm->tm_min = readb(base + S3C2410_RTCMIN);
146 rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
147 rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
148 rtc_tm->tm_mon = readb(base + S3C2410_RTCMON);
149 rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
150 rtc_tm->tm_sec = readb(base + S3C2410_RTCSEC);
Ben Dooks1add6782006-07-01 04:36:26 -0700151
152 /* the only way to work out wether the system was mid-update
153 * when we read it is to check the second counter, and if it
154 * is zero, then we re-try the entire read
155 */
156
157 if (rtc_tm->tm_sec == 0 && !have_retried) {
158 have_retried = 1;
159 goto retry_get_time;
160 }
161
162 pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n",
163 rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
164 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
165
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700166 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
167 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
168 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
169 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
170 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
171 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
Ben Dooks1add6782006-07-01 04:36:26 -0700172
173 rtc_tm->tm_year += 100;
174 rtc_tm->tm_mon -= 1;
175
176 return 0;
177}
178
179static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
180{
Ben Dooks9a654512006-08-27 01:23:22 -0700181 void __iomem *base = s3c_rtc_base;
Ben Dooks641741e2006-08-27 01:23:27 -0700182 int year = tm->tm_year - 100;
Ben Dooks1add6782006-07-01 04:36:26 -0700183
Ben Dooks9a654512006-08-27 01:23:22 -0700184 pr_debug("set time %02d.%02d.%02d %02d/%02d/%02d\n",
185 tm->tm_year, tm->tm_mon, tm->tm_mday,
186 tm->tm_hour, tm->tm_min, tm->tm_sec);
187
Ben Dooks641741e2006-08-27 01:23:27 -0700188 /* we get around y2k by simply not supporting it */
189
190 if (year < 0 || year >= 100) {
191 dev_err(dev, "rtc only supports 100 years\n");
192 return -EINVAL;
193 }
194
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700195 writeb(bin2bcd(tm->tm_sec), base + S3C2410_RTCSEC);
196 writeb(bin2bcd(tm->tm_min), base + S3C2410_RTCMIN);
197 writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
198 writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
199 writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
200 writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
Ben Dooks1add6782006-07-01 04:36:26 -0700201
202 return 0;
203}
204
205static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
206{
207 struct rtc_time *alm_tm = &alrm->time;
Ben Dooks9a654512006-08-27 01:23:22 -0700208 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700209 unsigned int alm_en;
210
Ben Dooks9a654512006-08-27 01:23:22 -0700211 alm_tm->tm_sec = readb(base + S3C2410_ALMSEC);
212 alm_tm->tm_min = readb(base + S3C2410_ALMMIN);
213 alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
214 alm_tm->tm_mon = readb(base + S3C2410_ALMMON);
215 alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
216 alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
Ben Dooks1add6782006-07-01 04:36:26 -0700217
Ben Dooks9a654512006-08-27 01:23:22 -0700218 alm_en = readb(base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700219
David Brownella2db8df2006-12-13 00:35:08 -0800220 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
221
Ben Dooks1add6782006-07-01 04:36:26 -0700222 pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n",
223 alm_en,
224 alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
225 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
226
227
228 /* decode the alarm enable field */
229
230 if (alm_en & S3C2410_RTCALM_SECEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700231 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
Ben Dooks1add6782006-07-01 04:36:26 -0700232 else
233 alm_tm->tm_sec = 0xff;
234
235 if (alm_en & S3C2410_RTCALM_MINEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700236 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
Ben Dooks1add6782006-07-01 04:36:26 -0700237 else
238 alm_tm->tm_min = 0xff;
239
240 if (alm_en & S3C2410_RTCALM_HOUREN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700241 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
Ben Dooks1add6782006-07-01 04:36:26 -0700242 else
243 alm_tm->tm_hour = 0xff;
244
245 if (alm_en & S3C2410_RTCALM_DAYEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700246 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
Ben Dooks1add6782006-07-01 04:36:26 -0700247 else
248 alm_tm->tm_mday = 0xff;
249
250 if (alm_en & S3C2410_RTCALM_MONEN) {
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700251 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
Ben Dooks1add6782006-07-01 04:36:26 -0700252 alm_tm->tm_mon -= 1;
253 } else {
254 alm_tm->tm_mon = 0xff;
255 }
256
257 if (alm_en & S3C2410_RTCALM_YEAREN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700258 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
Ben Dooks1add6782006-07-01 04:36:26 -0700259 else
260 alm_tm->tm_year = 0xffff;
261
262 return 0;
263}
264
265static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
266{
267 struct rtc_time *tm = &alrm->time;
Ben Dooks9a654512006-08-27 01:23:22 -0700268 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700269 unsigned int alrm_en;
270
271 pr_debug("s3c_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n",
272 alrm->enabled,
273 tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff,
274 tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec);
275
276
Ben Dooks9a654512006-08-27 01:23:22 -0700277 alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
278 writeb(0x00, base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700279
280 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
281 alrm_en |= S3C2410_RTCALM_SECEN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700282 writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
Ben Dooks1add6782006-07-01 04:36:26 -0700283 }
284
285 if (tm->tm_min < 60 && tm->tm_min >= 0) {
286 alrm_en |= S3C2410_RTCALM_MINEN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700287 writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
Ben Dooks1add6782006-07-01 04:36:26 -0700288 }
289
290 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
291 alrm_en |= S3C2410_RTCALM_HOUREN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700292 writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
Ben Dooks1add6782006-07-01 04:36:26 -0700293 }
294
295 pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
296
Ben Dooks9a654512006-08-27 01:23:22 -0700297 writeb(alrm_en, base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700298
Ben Dooks773be7e2008-07-23 21:30:45 -0700299 s3c_rtc_setaie(alrm->enabled);
Ben Dooks1add6782006-07-01 04:36:26 -0700300
301 if (alrm->enabled)
302 enable_irq_wake(s3c_rtc_alarmno);
303 else
304 disable_irq_wake(s3c_rtc_alarmno);
305
306 return 0;
307}
308
Ben Dooks1add6782006-07-01 04:36:26 -0700309static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
310{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700311 unsigned int ticnt;
Ben Dooks1add6782006-07-01 04:36:26 -0700312
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700313 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
314 ticnt = readb(s3c_rtc_base + S3C2410_RTCCON);
315 ticnt &= S3C64XX_RTCCON_TICEN;
316 } else {
317 ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
318 ticnt &= S3C2410_TICNT_ENABLE;
319 }
320
321 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
Ben Dooks1add6782006-07-01 04:36:26 -0700322 return 0;
323}
324
325static int s3c_rtc_open(struct device *dev)
326{
327 struct platform_device *pdev = to_platform_device(dev);
328 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
329 int ret;
330
331 ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
Thomas Gleixner38515e92007-02-14 00:33:16 -0800332 IRQF_DISABLED, "s3c2410-rtc alarm", rtc_dev);
Ben Dooks1add6782006-07-01 04:36:26 -0700333
334 if (ret) {
335 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
336 return ret;
337 }
338
339 ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
Thomas Gleixner38515e92007-02-14 00:33:16 -0800340 IRQF_DISABLED, "s3c2410-rtc tick", rtc_dev);
Ben Dooks1add6782006-07-01 04:36:26 -0700341
342 if (ret) {
343 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
344 goto tick_err;
345 }
346
347 return ret;
348
349 tick_err:
350 free_irq(s3c_rtc_alarmno, rtc_dev);
351 return ret;
352}
353
354static void s3c_rtc_release(struct device *dev)
355{
356 struct platform_device *pdev = to_platform_device(dev);
357 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
358
359 /* do not clear AIE here, it may be needed for wake */
360
Ben Dooks773be7e2008-07-23 21:30:45 -0700361 s3c_rtc_setpie(dev, 0);
Ben Dooks1add6782006-07-01 04:36:26 -0700362 free_irq(s3c_rtc_alarmno, rtc_dev);
363 free_irq(s3c_rtc_tickno, rtc_dev);
364}
365
David Brownellff8371a2006-09-30 23:28:17 -0700366static const struct rtc_class_ops s3c_rtcops = {
Ben Dooks1add6782006-07-01 04:36:26 -0700367 .open = s3c_rtc_open,
368 .release = s3c_rtc_release,
Ben Dooks1add6782006-07-01 04:36:26 -0700369 .read_time = s3c_rtc_gettime,
370 .set_time = s3c_rtc_settime,
371 .read_alarm = s3c_rtc_getalarm,
372 .set_alarm = s3c_rtc_setalarm,
Ben Dooks773be7e2008-07-23 21:30:45 -0700373 .irq_set_freq = s3c_rtc_setfreq,
374 .irq_set_state = s3c_rtc_setpie,
Ben Dooks1add6782006-07-01 04:36:26 -0700375 .proc = s3c_rtc_proc,
376};
377
378static void s3c_rtc_enable(struct platform_device *pdev, int en)
379{
Ben Dooks9a654512006-08-27 01:23:22 -0700380 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700381 unsigned int tmp;
382
383 if (s3c_rtc_base == NULL)
384 return;
385
386 if (!en) {
Ben Dooks9a654512006-08-27 01:23:22 -0700387 tmp = readb(base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700388 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
389 tmp &= ~S3C64XX_RTCCON_TICEN;
390 tmp &= ~S3C2410_RTCCON_RTCEN;
391 writeb(tmp, base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700392
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700393 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
394 tmp = readb(base + S3C2410_TICNT);
395 tmp &= ~S3C2410_TICNT_ENABLE;
396 writeb(tmp, base + S3C2410_TICNT);
397 }
Ben Dooks1add6782006-07-01 04:36:26 -0700398 } else {
399 /* re-enable the device, and check it is ok */
400
Ben Dooks9a654512006-08-27 01:23:22 -0700401 if ((readb(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0){
Ben Dooks1add6782006-07-01 04:36:26 -0700402 dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
403
Ben Dooks9a654512006-08-27 01:23:22 -0700404 tmp = readb(base + S3C2410_RTCCON);
405 writeb(tmp|S3C2410_RTCCON_RTCEN, base+S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700406 }
407
Ben Dooks9a654512006-08-27 01:23:22 -0700408 if ((readb(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)){
Ben Dooks1add6782006-07-01 04:36:26 -0700409 dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
410
Ben Dooks9a654512006-08-27 01:23:22 -0700411 tmp = readb(base + S3C2410_RTCCON);
412 writeb(tmp& ~S3C2410_RTCCON_CNTSEL, base+S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700413 }
414
Ben Dooks9a654512006-08-27 01:23:22 -0700415 if ((readb(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)){
Ben Dooks1add6782006-07-01 04:36:26 -0700416 dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
417
Ben Dooks9a654512006-08-27 01:23:22 -0700418 tmp = readb(base + S3C2410_RTCCON);
419 writeb(tmp & ~S3C2410_RTCCON_CLKRST, base+S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700420 }
421 }
422}
423
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700424static int __devexit s3c_rtc_remove(struct platform_device *dev)
Ben Dooks1add6782006-07-01 04:36:26 -0700425{
426 struct rtc_device *rtc = platform_get_drvdata(dev);
427
428 platform_set_drvdata(dev, NULL);
429 rtc_device_unregister(rtc);
430
Ben Dooks773be7e2008-07-23 21:30:45 -0700431 s3c_rtc_setpie(&dev->dev, 0);
Ben Dooks1add6782006-07-01 04:36:26 -0700432 s3c_rtc_setaie(0);
433
434 iounmap(s3c_rtc_base);
435 release_resource(s3c_rtc_mem);
436 kfree(s3c_rtc_mem);
437
438 return 0;
439}
440
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700441static int __devinit s3c_rtc_probe(struct platform_device *pdev)
Ben Dooks1add6782006-07-01 04:36:26 -0700442{
443 struct rtc_device *rtc;
444 struct resource *res;
445 int ret;
446
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700447 pr_debug("%s: probe=%p\n", __func__, pdev);
Ben Dooks1add6782006-07-01 04:36:26 -0700448
449 /* find the IRQs */
450
451 s3c_rtc_tickno = platform_get_irq(pdev, 1);
452 if (s3c_rtc_tickno < 0) {
453 dev_err(&pdev->dev, "no irq for rtc tick\n");
454 return -ENOENT;
455 }
456
457 s3c_rtc_alarmno = platform_get_irq(pdev, 0);
458 if (s3c_rtc_alarmno < 0) {
459 dev_err(&pdev->dev, "no irq for alarm\n");
460 return -ENOENT;
461 }
462
463 pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
464 s3c_rtc_tickno, s3c_rtc_alarmno);
465
466 /* get the memory region */
467
468 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
469 if (res == NULL) {
470 dev_err(&pdev->dev, "failed to get memory region resource\n");
471 return -ENOENT;
472 }
473
474 s3c_rtc_mem = request_mem_region(res->start,
Ben Dooks9a654512006-08-27 01:23:22 -0700475 res->end-res->start+1,
476 pdev->name);
Ben Dooks1add6782006-07-01 04:36:26 -0700477
478 if (s3c_rtc_mem == NULL) {
479 dev_err(&pdev->dev, "failed to reserve memory region\n");
480 ret = -ENOENT;
481 goto err_nores;
482 }
483
484 s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
485 if (s3c_rtc_base == NULL) {
486 dev_err(&pdev->dev, "failed ioremap()\n");
487 ret = -EINVAL;
488 goto err_nomap;
489 }
490
491 /* check to see if everything is setup correctly */
492
493 s3c_rtc_enable(pdev, 1);
494
Ben Dooks9a654512006-08-27 01:23:22 -0700495 pr_debug("s3c2410_rtc: RTCCON=%02x\n",
496 readb(s3c_rtc_base + S3C2410_RTCCON));
Ben Dooks1add6782006-07-01 04:36:26 -0700497
Yauhen Kharuzhy51b76162008-10-29 14:01:16 -0700498 device_init_wakeup(&pdev->dev, 1);
499
Ben Dooks1add6782006-07-01 04:36:26 -0700500 /* register RTC and exit */
501
502 rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
503 THIS_MODULE);
504
505 if (IS_ERR(rtc)) {
506 dev_err(&pdev->dev, "cannot attach rtc\n");
507 ret = PTR_ERR(rtc);
508 goto err_nortc;
509 }
510
Maurus Cuelenaereeaa6e4d2010-06-04 14:14:46 -0700511 s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;
512
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700513 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
514 rtc->max_user_freq = 32768;
515 else
516 rtc->max_user_freq = 128;
517
Ben Dooks1add6782006-07-01 04:36:26 -0700518 platform_set_drvdata(pdev, rtc);
Maurus Cuelenaeree893de52010-06-04 14:14:44 -0700519
520 s3c_rtc_setfreq(&pdev->dev, 1);
521
Ben Dooks1add6782006-07-01 04:36:26 -0700522 return 0;
523
524 err_nortc:
525 s3c_rtc_enable(pdev, 0);
526 iounmap(s3c_rtc_base);
527
528 err_nomap:
529 release_resource(s3c_rtc_mem);
530
531 err_nores:
532 return ret;
533}
534
535#ifdef CONFIG_PM
536
537/* RTC Power management control */
538
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700539static int ticnt_save, ticnt_en_save;
Ben Dooks1add6782006-07-01 04:36:26 -0700540
541static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
542{
Ben Dooks1add6782006-07-01 04:36:26 -0700543 /* save TICNT for anyone using periodic interrupts */
Ben Dooks9a654512006-08-27 01:23:22 -0700544 ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700545 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
546 ticnt_en_save = readb(s3c_rtc_base + S3C2410_RTCCON);
547 ticnt_en_save &= S3C64XX_RTCCON_TICEN;
548 }
Ben Dooks1add6782006-07-01 04:36:26 -0700549 s3c_rtc_enable(pdev, 0);
Ben Dooks1add6782006-07-01 04:36:26 -0700550 return 0;
551}
552
553static int s3c_rtc_resume(struct platform_device *pdev)
554{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700555 unsigned int tmp;
556
Ben Dooks1add6782006-07-01 04:36:26 -0700557 s3c_rtc_enable(pdev, 1);
Ben Dooks9a654512006-08-27 01:23:22 -0700558 writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700559 if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
560 tmp = readb(s3c_rtc_base + S3C2410_RTCCON);
561 writeb(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
562 }
Ben Dooks1add6782006-07-01 04:36:26 -0700563 return 0;
564}
565#else
566#define s3c_rtc_suspend NULL
567#define s3c_rtc_resume NULL
568#endif
569
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700570static struct platform_device_id s3c_rtc_driver_ids[] = {
571 {
572 .name = "s3c2410-rtc",
573 .driver_data = TYPE_S3C2410,
574 }, {
575 .name = "s3c64xx-rtc",
576 .driver_data = TYPE_S3C64XX,
577 },
578 { }
579};
580
581MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
582
583static struct platform_driver s3c_rtc_driver = {
Ben Dooks1add6782006-07-01 04:36:26 -0700584 .probe = s3c_rtc_probe,
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700585 .remove = __devexit_p(s3c_rtc_remove),
Ben Dooks1add6782006-07-01 04:36:26 -0700586 .suspend = s3c_rtc_suspend,
587 .resume = s3c_rtc_resume,
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700588 .id_table = s3c_rtc_driver_ids,
Ben Dooks1add6782006-07-01 04:36:26 -0700589 .driver = {
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700590 .name = "s3c-rtc",
Ben Dooks1add6782006-07-01 04:36:26 -0700591 .owner = THIS_MODULE,
592 },
593};
594
595static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
596
597static int __init s3c_rtc_init(void)
598{
599 printk(banner);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700600 return platform_driver_register(&s3c_rtc_driver);
Ben Dooks1add6782006-07-01 04:36:26 -0700601}
602
603static void __exit s3c_rtc_exit(void)
604{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700605 platform_driver_unregister(&s3c_rtc_driver);
Ben Dooks1add6782006-07-01 04:36:26 -0700606}
607
608module_init(s3c_rtc_init);
609module_exit(s3c_rtc_exit);
610
611MODULE_DESCRIPTION("Samsung S3C RTC Driver");
612MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
613MODULE_LICENSE("GPL");
Kay Sieversad28a072008-04-10 21:29:25 -0700614MODULE_ALIAS("platform:s3c2410-rtc");