blob: 16512ecae31a384fef42e743884b5b0c8d905d7d [file] [log] [blame]
Ben Dooks1add6782006-07-01 04:36:26 -07001/* drivers/rtc/rtc-s3c.c
2 *
Atul Dahiyae48add82010-07-20 12:19:14 +05303 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com/
5 *
Ben Dooks1add6782006-07-01 04:36:26 -07006 * Copyright (c) 2004,2006 Simtec Electronics
7 * Ben Dooks, <ben@simtec.co.uk>
8 * http://armlinux.simtec.co.uk/
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 * S3C2410/S3C2440/S3C24XX Internal RTC Driver
15*/
16
17#include <linux/module.h>
18#include <linux/fs.h>
19#include <linux/string.h>
20#include <linux/init.h>
21#include <linux/platform_device.h>
22#include <linux/interrupt.h>
23#include <linux/rtc.h>
24#include <linux/bcd.h>
25#include <linux/clk.h>
Robert P. J. Day9974b6e2008-02-06 01:38:42 -080026#include <linux/log2.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090027#include <linux/slab.h>
Ben Dooks1add6782006-07-01 04:36:26 -070028
Russell Kinga09e64f2008-08-05 16:14:15 +010029#include <mach/hardware.h>
Ben Dooks1add6782006-07-01 04:36:26 -070030#include <asm/uaccess.h>
31#include <asm/io.h>
32#include <asm/irq.h>
Ben Dookse2cd00c2008-10-30 10:14:34 +000033#include <plat/regs-rtc.h>
Ben Dooks1add6782006-07-01 04:36:26 -070034
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -070035enum s3c_cpu_type {
36 TYPE_S3C2410,
37 TYPE_S3C64XX,
38};
39
Ben Dooks1add6782006-07-01 04:36:26 -070040/* I have yet to find an S3C implementation with more than one
41 * of these rtc blocks in */
42
43static struct resource *s3c_rtc_mem;
44
Atul Dahiyae48add82010-07-20 12:19:14 +053045static struct clk *rtc_clk;
Ben Dooks1add6782006-07-01 04:36:26 -070046static void __iomem *s3c_rtc_base;
47static int s3c_rtc_alarmno = NO_IRQ;
48static int s3c_rtc_tickno = NO_IRQ;
Ben Dooks52cd4e52011-05-11 15:13:28 -070049static bool wake_en;
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -070050static enum s3c_cpu_type s3c_rtc_cpu_type;
Ben Dooks1add6782006-07-01 04:36:26 -070051
52static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
Ben Dooks1add6782006-07-01 04:36:26 -070053
54/* IRQ Handlers */
55
David Howells7d12e782006-10-05 14:55:46 +010056static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
Ben Dooks1add6782006-07-01 04:36:26 -070057{
58 struct rtc_device *rdev = id;
59
David Brownellab6a2d72007-05-08 00:33:30 -070060 rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
Atul Dahiya2f3478f2010-07-20 16:02:51 +053061
62 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
63 writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
64
Ben Dooks1add6782006-07-01 04:36:26 -070065 return IRQ_HANDLED;
66}
67
David Howells7d12e782006-10-05 14:55:46 +010068static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
Ben Dooks1add6782006-07-01 04:36:26 -070069{
70 struct rtc_device *rdev = id;
71
Ben Dooks773be7e2008-07-23 21:30:45 -070072 rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
Atul Dahiya2f3478f2010-07-20 16:02:51 +053073
74 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
75 writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
76
Ben Dooks1add6782006-07-01 04:36:26 -070077 return IRQ_HANDLED;
78}
79
80/* Update control registers */
Axel Lin2ec38a02011-03-04 17:36:19 -080081static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
Ben Dooks1add6782006-07-01 04:36:26 -070082{
83 unsigned int tmp;
84
Axel Lin2ec38a02011-03-04 17:36:19 -080085 pr_debug("%s: aie=%d\n", __func__, enabled);
Ben Dooks1add6782006-07-01 04:36:26 -070086
Ben Dooks9a654512006-08-27 01:23:22 -070087 tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
Ben Dooks1add6782006-07-01 04:36:26 -070088
Axel Lin2ec38a02011-03-04 17:36:19 -080089 if (enabled)
Ben Dooks1add6782006-07-01 04:36:26 -070090 tmp |= S3C2410_RTCALM_ALMEN;
91
Ben Dooks9a654512006-08-27 01:23:22 -070092 writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
Axel Lin2ec38a02011-03-04 17:36:19 -080093
94 return 0;
Ben Dooks1add6782006-07-01 04:36:26 -070095}
96
Ben Dooks773be7e2008-07-23 21:30:45 -070097static int s3c_rtc_setfreq(struct device *dev, int freq)
Ben Dooks1add6782006-07-01 04:36:26 -070098{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -070099 struct platform_device *pdev = to_platform_device(dev);
100 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
101 unsigned int tmp = 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700102
Jonathan Cameron5d2a5032009-01-06 14:42:12 -0800103 if (!is_power_of_2(freq))
104 return -EINVAL;
105
Ben Dooks1add6782006-07-01 04:36:26 -0700106 spin_lock_irq(&s3c_rtc_pie_lock);
Ben Dooks773be7e2008-07-23 21:30:45 -0700107
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700108 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
109 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
110 tmp &= S3C2410_TICNT_ENABLE;
111 }
112
113 tmp |= (rtc_dev->max_user_freq / freq)-1;
Ben Dooks1add6782006-07-01 04:36:26 -0700114
Atul Dahiya2f3478f2010-07-20 16:02:51 +0530115 writel(tmp, s3c_rtc_base + S3C2410_TICNT);
Ben Dooks1add6782006-07-01 04:36:26 -0700116 spin_unlock_irq(&s3c_rtc_pie_lock);
Ben Dooks773be7e2008-07-23 21:30:45 -0700117
118 return 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700119}
120
121/* Time read/write */
122
123static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
124{
125 unsigned int have_retried = 0;
Ben Dooks9a654512006-08-27 01:23:22 -0700126 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700127
128 retry_get_time:
Ben Dooks9a654512006-08-27 01:23:22 -0700129 rtc_tm->tm_min = readb(base + S3C2410_RTCMIN);
130 rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
131 rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
132 rtc_tm->tm_mon = readb(base + S3C2410_RTCMON);
133 rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
134 rtc_tm->tm_sec = readb(base + S3C2410_RTCSEC);
Ben Dooks1add6782006-07-01 04:36:26 -0700135
136 /* the only way to work out wether the system was mid-update
137 * when we read it is to check the second counter, and if it
138 * is zero, then we re-try the entire read
139 */
140
141 if (rtc_tm->tm_sec == 0 && !have_retried) {
142 have_retried = 1;
143 goto retry_get_time;
144 }
145
Kukjin Kim30ffc402010-10-27 15:33:09 -0700146 pr_debug("read time %04d.%02d.%02d %02d:%02d:%02d\n",
147 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
Ben Dooks1add6782006-07-01 04:36:26 -0700148 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
149
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700150 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
151 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
152 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
153 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
154 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
155 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
Ben Dooks1add6782006-07-01 04:36:26 -0700156
157 rtc_tm->tm_year += 100;
158 rtc_tm->tm_mon -= 1;
159
Kukjin Kim5b3ffdd2010-10-27 15:33:11 -0700160 return rtc_valid_tm(rtc_tm);
Ben Dooks1add6782006-07-01 04:36:26 -0700161}
162
163static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
164{
Ben Dooks9a654512006-08-27 01:23:22 -0700165 void __iomem *base = s3c_rtc_base;
Ben Dooks641741e2006-08-27 01:23:27 -0700166 int year = tm->tm_year - 100;
Ben Dooks1add6782006-07-01 04:36:26 -0700167
Kukjin Kim30ffc402010-10-27 15:33:09 -0700168 pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
169 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
Ben Dooks9a654512006-08-27 01:23:22 -0700170 tm->tm_hour, tm->tm_min, tm->tm_sec);
171
Ben Dooks641741e2006-08-27 01:23:27 -0700172 /* we get around y2k by simply not supporting it */
173
174 if (year < 0 || year >= 100) {
175 dev_err(dev, "rtc only supports 100 years\n");
176 return -EINVAL;
177 }
178
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700179 writeb(bin2bcd(tm->tm_sec), base + S3C2410_RTCSEC);
180 writeb(bin2bcd(tm->tm_min), base + S3C2410_RTCMIN);
181 writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
182 writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
183 writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
184 writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
Ben Dooks1add6782006-07-01 04:36:26 -0700185
186 return 0;
187}
188
189static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
190{
191 struct rtc_time *alm_tm = &alrm->time;
Ben Dooks9a654512006-08-27 01:23:22 -0700192 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700193 unsigned int alm_en;
194
Ben Dooks9a654512006-08-27 01:23:22 -0700195 alm_tm->tm_sec = readb(base + S3C2410_ALMSEC);
196 alm_tm->tm_min = readb(base + S3C2410_ALMMIN);
197 alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
198 alm_tm->tm_mon = readb(base + S3C2410_ALMMON);
199 alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
200 alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
Ben Dooks1add6782006-07-01 04:36:26 -0700201
Ben Dooks9a654512006-08-27 01:23:22 -0700202 alm_en = readb(base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700203
David Brownella2db8df2006-12-13 00:35:08 -0800204 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
205
Kukjin Kim30ffc402010-10-27 15:33:09 -0700206 pr_debug("read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
Ben Dooks1add6782006-07-01 04:36:26 -0700207 alm_en,
Kukjin Kim30ffc402010-10-27 15:33:09 -0700208 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
Ben Dooks1add6782006-07-01 04:36:26 -0700209 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
210
211
212 /* decode the alarm enable field */
213
214 if (alm_en & S3C2410_RTCALM_SECEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700215 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
Ben Dooks1add6782006-07-01 04:36:26 -0700216 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700217 alm_tm->tm_sec = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700218
219 if (alm_en & S3C2410_RTCALM_MINEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700220 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
Ben Dooks1add6782006-07-01 04:36:26 -0700221 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700222 alm_tm->tm_min = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700223
224 if (alm_en & S3C2410_RTCALM_HOUREN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700225 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
Ben Dooks1add6782006-07-01 04:36:26 -0700226 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700227 alm_tm->tm_hour = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700228
229 if (alm_en & S3C2410_RTCALM_DAYEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700230 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
Ben Dooks1add6782006-07-01 04:36:26 -0700231 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700232 alm_tm->tm_mday = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700233
234 if (alm_en & S3C2410_RTCALM_MONEN) {
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700235 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
Ben Dooks1add6782006-07-01 04:36:26 -0700236 alm_tm->tm_mon -= 1;
237 } else {
Changhwan Youndd061d12010-10-27 15:33:08 -0700238 alm_tm->tm_mon = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700239 }
240
241 if (alm_en & S3C2410_RTCALM_YEAREN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700242 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
Ben Dooks1add6782006-07-01 04:36:26 -0700243 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700244 alm_tm->tm_year = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700245
246 return 0;
247}
248
249static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
250{
251 struct rtc_time *tm = &alrm->time;
Ben Dooks9a654512006-08-27 01:23:22 -0700252 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700253 unsigned int alrm_en;
254
Kukjin Kim30ffc402010-10-27 15:33:09 -0700255 pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
Ben Dooks1add6782006-07-01 04:36:26 -0700256 alrm->enabled,
Kukjin Kim30ffc402010-10-27 15:33:09 -0700257 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
258 tm->tm_hour, tm->tm_min, tm->tm_sec);
Ben Dooks1add6782006-07-01 04:36:26 -0700259
260
Ben Dooks9a654512006-08-27 01:23:22 -0700261 alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
262 writeb(0x00, base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700263
264 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
265 alrm_en |= S3C2410_RTCALM_SECEN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700266 writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
Ben Dooks1add6782006-07-01 04:36:26 -0700267 }
268
269 if (tm->tm_min < 60 && tm->tm_min >= 0) {
270 alrm_en |= S3C2410_RTCALM_MINEN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700271 writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
Ben Dooks1add6782006-07-01 04:36:26 -0700272 }
273
274 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
275 alrm_en |= S3C2410_RTCALM_HOUREN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700276 writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
Ben Dooks1add6782006-07-01 04:36:26 -0700277 }
278
279 pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
280
Ben Dooks9a654512006-08-27 01:23:22 -0700281 writeb(alrm_en, base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700282
Axel Lin2ec38a02011-03-04 17:36:19 -0800283 s3c_rtc_setaie(dev, alrm->enabled);
Ben Dooks1add6782006-07-01 04:36:26 -0700284
Ben Dooks1add6782006-07-01 04:36:26 -0700285 return 0;
286}
287
Ben Dooks1add6782006-07-01 04:36:26 -0700288static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
289{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700290 unsigned int ticnt;
Ben Dooks1add6782006-07-01 04:36:26 -0700291
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700292 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700293 ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700294 ticnt &= S3C64XX_RTCCON_TICEN;
295 } else {
296 ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
297 ticnt &= S3C2410_TICNT_ENABLE;
298 }
299
300 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
Ben Dooks1add6782006-07-01 04:36:26 -0700301 return 0;
302}
303
304static int s3c_rtc_open(struct device *dev)
305{
306 struct platform_device *pdev = to_platform_device(dev);
307 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
308 int ret;
309
310 ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
Thomas Gleixner38515e92007-02-14 00:33:16 -0800311 IRQF_DISABLED, "s3c2410-rtc alarm", rtc_dev);
Ben Dooks1add6782006-07-01 04:36:26 -0700312
313 if (ret) {
314 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
315 return ret;
316 }
317
318 ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
Thomas Gleixner38515e92007-02-14 00:33:16 -0800319 IRQF_DISABLED, "s3c2410-rtc tick", rtc_dev);
Ben Dooks1add6782006-07-01 04:36:26 -0700320
321 if (ret) {
322 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
323 goto tick_err;
324 }
325
326 return ret;
327
328 tick_err:
329 free_irq(s3c_rtc_alarmno, rtc_dev);
330 return ret;
331}
332
333static void s3c_rtc_release(struct device *dev)
334{
335 struct platform_device *pdev = to_platform_device(dev);
336 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
337
338 /* do not clear AIE here, it may be needed for wake */
339
Ben Dooks1add6782006-07-01 04:36:26 -0700340 free_irq(s3c_rtc_alarmno, rtc_dev);
341 free_irq(s3c_rtc_tickno, rtc_dev);
342}
343
David Brownellff8371a2006-09-30 23:28:17 -0700344static const struct rtc_class_ops s3c_rtcops = {
Ben Dooks1add6782006-07-01 04:36:26 -0700345 .open = s3c_rtc_open,
346 .release = s3c_rtc_release,
Ben Dooks1add6782006-07-01 04:36:26 -0700347 .read_time = s3c_rtc_gettime,
348 .set_time = s3c_rtc_settime,
349 .read_alarm = s3c_rtc_getalarm,
350 .set_alarm = s3c_rtc_setalarm,
Changhwan Youne6eb5242010-10-27 15:33:09 -0700351 .proc = s3c_rtc_proc,
352 .alarm_irq_enable = s3c_rtc_setaie,
Ben Dooks1add6782006-07-01 04:36:26 -0700353};
354
355static void s3c_rtc_enable(struct platform_device *pdev, int en)
356{
Ben Dooks9a654512006-08-27 01:23:22 -0700357 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700358 unsigned int tmp;
359
360 if (s3c_rtc_base == NULL)
361 return;
362
363 if (!en) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700364 tmp = readw(base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700365 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
366 tmp &= ~S3C64XX_RTCCON_TICEN;
367 tmp &= ~S3C2410_RTCCON_RTCEN;
Changhwan Younf61ae672010-10-27 15:33:06 -0700368 writew(tmp, base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700369
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700370 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
371 tmp = readb(base + S3C2410_TICNT);
372 tmp &= ~S3C2410_TICNT_ENABLE;
373 writeb(tmp, base + S3C2410_TICNT);
374 }
Ben Dooks1add6782006-07-01 04:36:26 -0700375 } else {
376 /* re-enable the device, and check it is ok */
377
Changhwan Younf61ae672010-10-27 15:33:06 -0700378 if ((readw(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
Ben Dooks1add6782006-07-01 04:36:26 -0700379 dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
380
Changhwan Younf61ae672010-10-27 15:33:06 -0700381 tmp = readw(base + S3C2410_RTCCON);
382 writew(tmp | S3C2410_RTCCON_RTCEN,
383 base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700384 }
385
Changhwan Younf61ae672010-10-27 15:33:06 -0700386 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {
Ben Dooks1add6782006-07-01 04:36:26 -0700387 dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
388
Changhwan Younf61ae672010-10-27 15:33:06 -0700389 tmp = readw(base + S3C2410_RTCCON);
390 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
391 base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700392 }
393
Changhwan Younf61ae672010-10-27 15:33:06 -0700394 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {
Ben Dooks1add6782006-07-01 04:36:26 -0700395 dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
396
Changhwan Younf61ae672010-10-27 15:33:06 -0700397 tmp = readw(base + S3C2410_RTCCON);
398 writew(tmp & ~S3C2410_RTCCON_CLKRST,
399 base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700400 }
401 }
402}
403
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700404static int __devexit s3c_rtc_remove(struct platform_device *dev)
Ben Dooks1add6782006-07-01 04:36:26 -0700405{
406 struct rtc_device *rtc = platform_get_drvdata(dev);
407
408 platform_set_drvdata(dev, NULL);
409 rtc_device_unregister(rtc);
410
Axel Lin2ec38a02011-03-04 17:36:19 -0800411 s3c_rtc_setaie(&dev->dev, 0);
Ben Dooks1add6782006-07-01 04:36:26 -0700412
Atul Dahiyae48add82010-07-20 12:19:14 +0530413 clk_disable(rtc_clk);
414 clk_put(rtc_clk);
415 rtc_clk = NULL;
416
Ben Dooks1add6782006-07-01 04:36:26 -0700417 iounmap(s3c_rtc_base);
418 release_resource(s3c_rtc_mem);
419 kfree(s3c_rtc_mem);
420
421 return 0;
422}
423
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700424static int __devinit s3c_rtc_probe(struct platform_device *pdev)
Ben Dooks1add6782006-07-01 04:36:26 -0700425{
426 struct rtc_device *rtc;
Changhwan Youne1df9622010-10-27 15:33:10 -0700427 struct rtc_time rtc_tm;
Ben Dooks1add6782006-07-01 04:36:26 -0700428 struct resource *res;
429 int ret;
430
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700431 pr_debug("%s: probe=%p\n", __func__, pdev);
Ben Dooks1add6782006-07-01 04:36:26 -0700432
433 /* find the IRQs */
434
435 s3c_rtc_tickno = platform_get_irq(pdev, 1);
436 if (s3c_rtc_tickno < 0) {
437 dev_err(&pdev->dev, "no irq for rtc tick\n");
438 return -ENOENT;
439 }
440
441 s3c_rtc_alarmno = platform_get_irq(pdev, 0);
442 if (s3c_rtc_alarmno < 0) {
443 dev_err(&pdev->dev, "no irq for alarm\n");
444 return -ENOENT;
445 }
446
447 pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
448 s3c_rtc_tickno, s3c_rtc_alarmno);
449
450 /* get the memory region */
451
452 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
453 if (res == NULL) {
454 dev_err(&pdev->dev, "failed to get memory region resource\n");
455 return -ENOENT;
456 }
457
458 s3c_rtc_mem = request_mem_region(res->start,
Ben Dooks9a654512006-08-27 01:23:22 -0700459 res->end-res->start+1,
460 pdev->name);
Ben Dooks1add6782006-07-01 04:36:26 -0700461
462 if (s3c_rtc_mem == NULL) {
463 dev_err(&pdev->dev, "failed to reserve memory region\n");
464 ret = -ENOENT;
465 goto err_nores;
466 }
467
468 s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
469 if (s3c_rtc_base == NULL) {
470 dev_err(&pdev->dev, "failed ioremap()\n");
471 ret = -EINVAL;
472 goto err_nomap;
473 }
474
Atul Dahiyae48add82010-07-20 12:19:14 +0530475 rtc_clk = clk_get(&pdev->dev, "rtc");
476 if (IS_ERR(rtc_clk)) {
477 dev_err(&pdev->dev, "failed to find rtc clock source\n");
478 ret = PTR_ERR(rtc_clk);
479 rtc_clk = NULL;
480 goto err_clk;
481 }
482
483 clk_enable(rtc_clk);
484
Ben Dooks1add6782006-07-01 04:36:26 -0700485 /* check to see if everything is setup correctly */
486
487 s3c_rtc_enable(pdev, 1);
488
Changhwan Younf61ae672010-10-27 15:33:06 -0700489 pr_debug("s3c2410_rtc: RTCCON=%02x\n",
490 readw(s3c_rtc_base + S3C2410_RTCCON));
Ben Dooks1add6782006-07-01 04:36:26 -0700491
Yauhen Kharuzhy51b76162008-10-29 14:01:16 -0700492 device_init_wakeup(&pdev->dev, 1);
493
Ben Dooks1add6782006-07-01 04:36:26 -0700494 /* register RTC and exit */
495
496 rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
497 THIS_MODULE);
498
499 if (IS_ERR(rtc)) {
500 dev_err(&pdev->dev, "cannot attach rtc\n");
501 ret = PTR_ERR(rtc);
502 goto err_nortc;
503 }
504
Maurus Cuelenaereeaa6e4d2010-06-04 14:14:46 -0700505 s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;
506
Taekgyun Ko051fe542010-07-29 13:00:42 +0900507 /* Check RTC Time */
508
Changhwan Youne1df9622010-10-27 15:33:10 -0700509 s3c_rtc_gettime(NULL, &rtc_tm);
Taekgyun Ko051fe542010-07-29 13:00:42 +0900510
Changhwan Youne1df9622010-10-27 15:33:10 -0700511 if (rtc_valid_tm(&rtc_tm)) {
512 rtc_tm.tm_year = 100;
513 rtc_tm.tm_mon = 0;
514 rtc_tm.tm_mday = 1;
515 rtc_tm.tm_hour = 0;
516 rtc_tm.tm_min = 0;
517 rtc_tm.tm_sec = 0;
518
519 s3c_rtc_settime(NULL, &rtc_tm);
520
521 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
Taekgyun Ko051fe542010-07-29 13:00:42 +0900522 }
523
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700524 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
525 rtc->max_user_freq = 32768;
526 else
527 rtc->max_user_freq = 128;
528
Ben Dooks1add6782006-07-01 04:36:26 -0700529 platform_set_drvdata(pdev, rtc);
Maurus Cuelenaeree893de52010-06-04 14:14:44 -0700530
531 s3c_rtc_setfreq(&pdev->dev, 1);
532
Ben Dooks1add6782006-07-01 04:36:26 -0700533 return 0;
534
535 err_nortc:
536 s3c_rtc_enable(pdev, 0);
Atul Dahiyae48add82010-07-20 12:19:14 +0530537 clk_disable(rtc_clk);
538 clk_put(rtc_clk);
539
540 err_clk:
Ben Dooks1add6782006-07-01 04:36:26 -0700541 iounmap(s3c_rtc_base);
542
543 err_nomap:
544 release_resource(s3c_rtc_mem);
545
546 err_nores:
547 return ret;
548}
549
550#ifdef CONFIG_PM
551
552/* RTC Power management control */
553
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700554static int ticnt_save, ticnt_en_save;
Ben Dooks1add6782006-07-01 04:36:26 -0700555
556static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
557{
Ben Dooks1add6782006-07-01 04:36:26 -0700558 /* save TICNT for anyone using periodic interrupts */
Ben Dooks9a654512006-08-27 01:23:22 -0700559 ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700560 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700561 ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700562 ticnt_en_save &= S3C64XX_RTCCON_TICEN;
563 }
Ben Dooks1add6782006-07-01 04:36:26 -0700564 s3c_rtc_enable(pdev, 0);
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700565
Ben Dooks52cd4e52011-05-11 15:13:28 -0700566 if (device_may_wakeup(&pdev->dev) && !wake_en) {
567 if (enable_irq_wake(s3c_rtc_alarmno) == 0)
568 wake_en = true;
569 else
570 dev_err(&pdev->dev, "enable_irq_wake failed\n");
571 }
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700572
Ben Dooks1add6782006-07-01 04:36:26 -0700573 return 0;
574}
575
576static int s3c_rtc_resume(struct platform_device *pdev)
577{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700578 unsigned int tmp;
579
Ben Dooks1add6782006-07-01 04:36:26 -0700580 s3c_rtc_enable(pdev, 1);
Ben Dooks9a654512006-08-27 01:23:22 -0700581 writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700582 if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700583 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
584 writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700585 }
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700586
Ben Dooks52cd4e52011-05-11 15:13:28 -0700587 if (device_may_wakeup(&pdev->dev) && wake_en) {
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700588 disable_irq_wake(s3c_rtc_alarmno);
Ben Dooks52cd4e52011-05-11 15:13:28 -0700589 wake_en = false;
590 }
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700591
Ben Dooks1add6782006-07-01 04:36:26 -0700592 return 0;
593}
594#else
595#define s3c_rtc_suspend NULL
596#define s3c_rtc_resume NULL
597#endif
598
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700599static struct platform_device_id s3c_rtc_driver_ids[] = {
600 {
601 .name = "s3c2410-rtc",
602 .driver_data = TYPE_S3C2410,
603 }, {
604 .name = "s3c64xx-rtc",
605 .driver_data = TYPE_S3C64XX,
606 },
607 { }
608};
609
610MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
611
612static struct platform_driver s3c_rtc_driver = {
Ben Dooks1add6782006-07-01 04:36:26 -0700613 .probe = s3c_rtc_probe,
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700614 .remove = __devexit_p(s3c_rtc_remove),
Ben Dooks1add6782006-07-01 04:36:26 -0700615 .suspend = s3c_rtc_suspend,
616 .resume = s3c_rtc_resume,
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700617 .id_table = s3c_rtc_driver_ids,
Ben Dooks1add6782006-07-01 04:36:26 -0700618 .driver = {
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700619 .name = "s3c-rtc",
Ben Dooks1add6782006-07-01 04:36:26 -0700620 .owner = THIS_MODULE,
621 },
622};
623
624static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
625
626static int __init s3c_rtc_init(void)
627{
628 printk(banner);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700629 return platform_driver_register(&s3c_rtc_driver);
Ben Dooks1add6782006-07-01 04:36:26 -0700630}
631
632static void __exit s3c_rtc_exit(void)
633{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700634 platform_driver_unregister(&s3c_rtc_driver);
Ben Dooks1add6782006-07-01 04:36:26 -0700635}
636
637module_init(s3c_rtc_init);
638module_exit(s3c_rtc_exit);
639
640MODULE_DESCRIPTION("Samsung S3C RTC Driver");
641MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
642MODULE_LICENSE("GPL");
Kay Sieversad28a072008-04-10 21:29:25 -0700643MODULE_ALIAS("platform:s3c2410-rtc");