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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;
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -070049static enum s3c_cpu_type s3c_rtc_cpu_type;
Ben Dooks1add6782006-07-01 04:36:26 -070050
51static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
Ben Dooks1add6782006-07-01 04:36:26 -070052
53/* IRQ Handlers */
54
David Howells7d12e782006-10-05 14:55:46 +010055static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
Ben Dooks1add6782006-07-01 04:36:26 -070056{
57 struct rtc_device *rdev = id;
58
David Brownellab6a2d72007-05-08 00:33:30 -070059 rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
Atul Dahiya2f3478f2010-07-20 16:02:51 +053060
61 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
62 writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
63
Ben Dooks1add6782006-07-01 04:36:26 -070064 return IRQ_HANDLED;
65}
66
David Howells7d12e782006-10-05 14:55:46 +010067static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
Ben Dooks1add6782006-07-01 04:36:26 -070068{
69 struct rtc_device *rdev = id;
70
Ben Dooks773be7e2008-07-23 21:30:45 -070071 rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
Atul Dahiya2f3478f2010-07-20 16:02:51 +053072
73 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
74 writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
75
Ben Dooks1add6782006-07-01 04:36:26 -070076 return IRQ_HANDLED;
77}
78
79/* Update control registers */
Axel Lin2ec38a02011-03-04 17:36:19 -080080static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
Ben Dooks1add6782006-07-01 04:36:26 -070081{
82 unsigned int tmp;
83
Axel Lin2ec38a02011-03-04 17:36:19 -080084 pr_debug("%s: aie=%d\n", __func__, enabled);
Ben Dooks1add6782006-07-01 04:36:26 -070085
Ben Dooks9a654512006-08-27 01:23:22 -070086 tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
Ben Dooks1add6782006-07-01 04:36:26 -070087
Axel Lin2ec38a02011-03-04 17:36:19 -080088 if (enabled)
Ben Dooks1add6782006-07-01 04:36:26 -070089 tmp |= S3C2410_RTCALM_ALMEN;
90
Ben Dooks9a654512006-08-27 01:23:22 -070091 writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
Axel Lin2ec38a02011-03-04 17:36:19 -080092
93 return 0;
Ben Dooks1add6782006-07-01 04:36:26 -070094}
95
Ben Dooks773be7e2008-07-23 21:30:45 -070096static int s3c_rtc_setfreq(struct device *dev, int freq)
Ben Dooks1add6782006-07-01 04:36:26 -070097{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -070098 struct platform_device *pdev = to_platform_device(dev);
99 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
100 unsigned int tmp = 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700101
Jonathan Cameron5d2a5032009-01-06 14:42:12 -0800102 if (!is_power_of_2(freq))
103 return -EINVAL;
104
Ben Dooks1add6782006-07-01 04:36:26 -0700105 spin_lock_irq(&s3c_rtc_pie_lock);
Ben Dooks773be7e2008-07-23 21:30:45 -0700106
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700107 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
108 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
109 tmp &= S3C2410_TICNT_ENABLE;
110 }
111
112 tmp |= (rtc_dev->max_user_freq / freq)-1;
Ben Dooks1add6782006-07-01 04:36:26 -0700113
Atul Dahiya2f3478f2010-07-20 16:02:51 +0530114 writel(tmp, s3c_rtc_base + S3C2410_TICNT);
Ben Dooks1add6782006-07-01 04:36:26 -0700115 spin_unlock_irq(&s3c_rtc_pie_lock);
Ben Dooks773be7e2008-07-23 21:30:45 -0700116
117 return 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700118}
119
120/* Time read/write */
121
122static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
123{
124 unsigned int have_retried = 0;
Ben Dooks9a654512006-08-27 01:23:22 -0700125 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700126
127 retry_get_time:
Ben Dooks9a654512006-08-27 01:23:22 -0700128 rtc_tm->tm_min = readb(base + S3C2410_RTCMIN);
129 rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
130 rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
131 rtc_tm->tm_mon = readb(base + S3C2410_RTCMON);
132 rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
133 rtc_tm->tm_sec = readb(base + S3C2410_RTCSEC);
Ben Dooks1add6782006-07-01 04:36:26 -0700134
135 /* the only way to work out wether the system was mid-update
136 * when we read it is to check the second counter, and if it
137 * is zero, then we re-try the entire read
138 */
139
140 if (rtc_tm->tm_sec == 0 && !have_retried) {
141 have_retried = 1;
142 goto retry_get_time;
143 }
144
Kukjin Kim30ffc402010-10-27 15:33:09 -0700145 pr_debug("read time %04d.%02d.%02d %02d:%02d:%02d\n",
146 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
Ben Dooks1add6782006-07-01 04:36:26 -0700147 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
148
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700149 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
150 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
151 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
152 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
153 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
154 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
Ben Dooks1add6782006-07-01 04:36:26 -0700155
156 rtc_tm->tm_year += 100;
157 rtc_tm->tm_mon -= 1;
158
Kukjin Kim5b3ffdd2010-10-27 15:33:11 -0700159 return rtc_valid_tm(rtc_tm);
Ben Dooks1add6782006-07-01 04:36:26 -0700160}
161
162static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
163{
Ben Dooks9a654512006-08-27 01:23:22 -0700164 void __iomem *base = s3c_rtc_base;
Ben Dooks641741e2006-08-27 01:23:27 -0700165 int year = tm->tm_year - 100;
Ben Dooks1add6782006-07-01 04:36:26 -0700166
Kukjin Kim30ffc402010-10-27 15:33:09 -0700167 pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
168 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
Ben Dooks9a654512006-08-27 01:23:22 -0700169 tm->tm_hour, tm->tm_min, tm->tm_sec);
170
Ben Dooks641741e2006-08-27 01:23:27 -0700171 /* we get around y2k by simply not supporting it */
172
173 if (year < 0 || year >= 100) {
174 dev_err(dev, "rtc only supports 100 years\n");
175 return -EINVAL;
176 }
177
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700178 writeb(bin2bcd(tm->tm_sec), base + S3C2410_RTCSEC);
179 writeb(bin2bcd(tm->tm_min), base + S3C2410_RTCMIN);
180 writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
181 writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
182 writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
183 writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
Ben Dooks1add6782006-07-01 04:36:26 -0700184
185 return 0;
186}
187
188static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
189{
190 struct rtc_time *alm_tm = &alrm->time;
Ben Dooks9a654512006-08-27 01:23:22 -0700191 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700192 unsigned int alm_en;
193
Ben Dooks9a654512006-08-27 01:23:22 -0700194 alm_tm->tm_sec = readb(base + S3C2410_ALMSEC);
195 alm_tm->tm_min = readb(base + S3C2410_ALMMIN);
196 alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
197 alm_tm->tm_mon = readb(base + S3C2410_ALMMON);
198 alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
199 alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
Ben Dooks1add6782006-07-01 04:36:26 -0700200
Ben Dooks9a654512006-08-27 01:23:22 -0700201 alm_en = readb(base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700202
David Brownella2db8df2006-12-13 00:35:08 -0800203 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
204
Kukjin Kim30ffc402010-10-27 15:33:09 -0700205 pr_debug("read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
Ben Dooks1add6782006-07-01 04:36:26 -0700206 alm_en,
Kukjin Kim30ffc402010-10-27 15:33:09 -0700207 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
Ben Dooks1add6782006-07-01 04:36:26 -0700208 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
209
210
211 /* decode the alarm enable field */
212
213 if (alm_en & S3C2410_RTCALM_SECEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700214 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
Ben Dooks1add6782006-07-01 04:36:26 -0700215 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700216 alm_tm->tm_sec = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700217
218 if (alm_en & S3C2410_RTCALM_MINEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700219 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
Ben Dooks1add6782006-07-01 04:36:26 -0700220 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700221 alm_tm->tm_min = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700222
223 if (alm_en & S3C2410_RTCALM_HOUREN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700224 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
Ben Dooks1add6782006-07-01 04:36:26 -0700225 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700226 alm_tm->tm_hour = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700227
228 if (alm_en & S3C2410_RTCALM_DAYEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700229 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
Ben Dooks1add6782006-07-01 04:36:26 -0700230 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700231 alm_tm->tm_mday = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700232
233 if (alm_en & S3C2410_RTCALM_MONEN) {
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700234 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
Ben Dooks1add6782006-07-01 04:36:26 -0700235 alm_tm->tm_mon -= 1;
236 } else {
Changhwan Youndd061d12010-10-27 15:33:08 -0700237 alm_tm->tm_mon = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700238 }
239
240 if (alm_en & S3C2410_RTCALM_YEAREN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700241 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
Ben Dooks1add6782006-07-01 04:36:26 -0700242 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700243 alm_tm->tm_year = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700244
245 return 0;
246}
247
248static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
249{
250 struct rtc_time *tm = &alrm->time;
Ben Dooks9a654512006-08-27 01:23:22 -0700251 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700252 unsigned int alrm_en;
253
Kukjin Kim30ffc402010-10-27 15:33:09 -0700254 pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
Ben Dooks1add6782006-07-01 04:36:26 -0700255 alrm->enabled,
Kukjin Kim30ffc402010-10-27 15:33:09 -0700256 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
257 tm->tm_hour, tm->tm_min, tm->tm_sec);
Ben Dooks1add6782006-07-01 04:36:26 -0700258
259
Ben Dooks9a654512006-08-27 01:23:22 -0700260 alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
261 writeb(0x00, base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700262
263 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
264 alrm_en |= S3C2410_RTCALM_SECEN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700265 writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
Ben Dooks1add6782006-07-01 04:36:26 -0700266 }
267
268 if (tm->tm_min < 60 && tm->tm_min >= 0) {
269 alrm_en |= S3C2410_RTCALM_MINEN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700270 writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
Ben Dooks1add6782006-07-01 04:36:26 -0700271 }
272
273 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
274 alrm_en |= S3C2410_RTCALM_HOUREN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700275 writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
Ben Dooks1add6782006-07-01 04:36:26 -0700276 }
277
278 pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
279
Ben Dooks9a654512006-08-27 01:23:22 -0700280 writeb(alrm_en, base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700281
Axel Lin2ec38a02011-03-04 17:36:19 -0800282 s3c_rtc_setaie(dev, alrm->enabled);
Ben Dooks1add6782006-07-01 04:36:26 -0700283
Ben Dooks1add6782006-07-01 04:36:26 -0700284 return 0;
285}
286
Ben Dooks1add6782006-07-01 04:36:26 -0700287static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
288{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700289 unsigned int ticnt;
Ben Dooks1add6782006-07-01 04:36:26 -0700290
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700291 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700292 ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700293 ticnt &= S3C64XX_RTCCON_TICEN;
294 } else {
295 ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
296 ticnt &= S3C2410_TICNT_ENABLE;
297 }
298
299 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
Ben Dooks1add6782006-07-01 04:36:26 -0700300 return 0;
301}
302
303static int s3c_rtc_open(struct device *dev)
304{
305 struct platform_device *pdev = to_platform_device(dev);
306 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
307 int ret;
308
309 ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
Thomas Gleixner38515e92007-02-14 00:33:16 -0800310 IRQF_DISABLED, "s3c2410-rtc alarm", rtc_dev);
Ben Dooks1add6782006-07-01 04:36:26 -0700311
312 if (ret) {
313 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
314 return ret;
315 }
316
317 ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
Thomas Gleixner38515e92007-02-14 00:33:16 -0800318 IRQF_DISABLED, "s3c2410-rtc tick", rtc_dev);
Ben Dooks1add6782006-07-01 04:36:26 -0700319
320 if (ret) {
321 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
322 goto tick_err;
323 }
324
325 return ret;
326
327 tick_err:
328 free_irq(s3c_rtc_alarmno, rtc_dev);
329 return ret;
330}
331
332static void s3c_rtc_release(struct device *dev)
333{
334 struct platform_device *pdev = to_platform_device(dev);
335 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
336
337 /* do not clear AIE here, it may be needed for wake */
338
Ben Dooks1add6782006-07-01 04:36:26 -0700339 free_irq(s3c_rtc_alarmno, rtc_dev);
340 free_irq(s3c_rtc_tickno, rtc_dev);
341}
342
David Brownellff8371a2006-09-30 23:28:17 -0700343static const struct rtc_class_ops s3c_rtcops = {
Ben Dooks1add6782006-07-01 04:36:26 -0700344 .open = s3c_rtc_open,
345 .release = s3c_rtc_release,
Ben Dooks1add6782006-07-01 04:36:26 -0700346 .read_time = s3c_rtc_gettime,
347 .set_time = s3c_rtc_settime,
348 .read_alarm = s3c_rtc_getalarm,
349 .set_alarm = s3c_rtc_setalarm,
Changhwan Youne6eb5242010-10-27 15:33:09 -0700350 .proc = s3c_rtc_proc,
351 .alarm_irq_enable = s3c_rtc_setaie,
Ben Dooks1add6782006-07-01 04:36:26 -0700352};
353
354static void s3c_rtc_enable(struct platform_device *pdev, int en)
355{
Ben Dooks9a654512006-08-27 01:23:22 -0700356 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700357 unsigned int tmp;
358
359 if (s3c_rtc_base == NULL)
360 return;
361
362 if (!en) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700363 tmp = readw(base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700364 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
365 tmp &= ~S3C64XX_RTCCON_TICEN;
366 tmp &= ~S3C2410_RTCCON_RTCEN;
Changhwan Younf61ae672010-10-27 15:33:06 -0700367 writew(tmp, base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700368
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700369 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
370 tmp = readb(base + S3C2410_TICNT);
371 tmp &= ~S3C2410_TICNT_ENABLE;
372 writeb(tmp, base + S3C2410_TICNT);
373 }
Ben Dooks1add6782006-07-01 04:36:26 -0700374 } else {
375 /* re-enable the device, and check it is ok */
376
Changhwan Younf61ae672010-10-27 15:33:06 -0700377 if ((readw(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
Ben Dooks1add6782006-07-01 04:36:26 -0700378 dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
379
Changhwan Younf61ae672010-10-27 15:33:06 -0700380 tmp = readw(base + S3C2410_RTCCON);
381 writew(tmp | S3C2410_RTCCON_RTCEN,
382 base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700383 }
384
Changhwan Younf61ae672010-10-27 15:33:06 -0700385 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {
Ben Dooks1add6782006-07-01 04:36:26 -0700386 dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
387
Changhwan Younf61ae672010-10-27 15:33:06 -0700388 tmp = readw(base + S3C2410_RTCCON);
389 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
390 base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700391 }
392
Changhwan Younf61ae672010-10-27 15:33:06 -0700393 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {
Ben Dooks1add6782006-07-01 04:36:26 -0700394 dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
395
Changhwan Younf61ae672010-10-27 15:33:06 -0700396 tmp = readw(base + S3C2410_RTCCON);
397 writew(tmp & ~S3C2410_RTCCON_CLKRST,
398 base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700399 }
400 }
401}
402
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700403static int __devexit s3c_rtc_remove(struct platform_device *dev)
Ben Dooks1add6782006-07-01 04:36:26 -0700404{
405 struct rtc_device *rtc = platform_get_drvdata(dev);
406
407 platform_set_drvdata(dev, NULL);
408 rtc_device_unregister(rtc);
409
Axel Lin2ec38a02011-03-04 17:36:19 -0800410 s3c_rtc_setaie(&dev->dev, 0);
Ben Dooks1add6782006-07-01 04:36:26 -0700411
Atul Dahiyae48add82010-07-20 12:19:14 +0530412 clk_disable(rtc_clk);
413 clk_put(rtc_clk);
414 rtc_clk = NULL;
415
Ben Dooks1add6782006-07-01 04:36:26 -0700416 iounmap(s3c_rtc_base);
417 release_resource(s3c_rtc_mem);
418 kfree(s3c_rtc_mem);
419
420 return 0;
421}
422
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700423static int __devinit s3c_rtc_probe(struct platform_device *pdev)
Ben Dooks1add6782006-07-01 04:36:26 -0700424{
425 struct rtc_device *rtc;
Changhwan Youne1df9622010-10-27 15:33:10 -0700426 struct rtc_time rtc_tm;
Ben Dooks1add6782006-07-01 04:36:26 -0700427 struct resource *res;
428 int ret;
429
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700430 pr_debug("%s: probe=%p\n", __func__, pdev);
Ben Dooks1add6782006-07-01 04:36:26 -0700431
432 /* find the IRQs */
433
434 s3c_rtc_tickno = platform_get_irq(pdev, 1);
435 if (s3c_rtc_tickno < 0) {
436 dev_err(&pdev->dev, "no irq for rtc tick\n");
437 return -ENOENT;
438 }
439
440 s3c_rtc_alarmno = platform_get_irq(pdev, 0);
441 if (s3c_rtc_alarmno < 0) {
442 dev_err(&pdev->dev, "no irq for alarm\n");
443 return -ENOENT;
444 }
445
446 pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
447 s3c_rtc_tickno, s3c_rtc_alarmno);
448
449 /* get the memory region */
450
451 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
452 if (res == NULL) {
453 dev_err(&pdev->dev, "failed to get memory region resource\n");
454 return -ENOENT;
455 }
456
457 s3c_rtc_mem = request_mem_region(res->start,
Ben Dooks9a654512006-08-27 01:23:22 -0700458 res->end-res->start+1,
459 pdev->name);
Ben Dooks1add6782006-07-01 04:36:26 -0700460
461 if (s3c_rtc_mem == NULL) {
462 dev_err(&pdev->dev, "failed to reserve memory region\n");
463 ret = -ENOENT;
464 goto err_nores;
465 }
466
467 s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
468 if (s3c_rtc_base == NULL) {
469 dev_err(&pdev->dev, "failed ioremap()\n");
470 ret = -EINVAL;
471 goto err_nomap;
472 }
473
Atul Dahiyae48add82010-07-20 12:19:14 +0530474 rtc_clk = clk_get(&pdev->dev, "rtc");
475 if (IS_ERR(rtc_clk)) {
476 dev_err(&pdev->dev, "failed to find rtc clock source\n");
477 ret = PTR_ERR(rtc_clk);
478 rtc_clk = NULL;
479 goto err_clk;
480 }
481
482 clk_enable(rtc_clk);
483
Ben Dooks1add6782006-07-01 04:36:26 -0700484 /* check to see if everything is setup correctly */
485
486 s3c_rtc_enable(pdev, 1);
487
Changhwan Younf61ae672010-10-27 15:33:06 -0700488 pr_debug("s3c2410_rtc: RTCCON=%02x\n",
489 readw(s3c_rtc_base + S3C2410_RTCCON));
Ben Dooks1add6782006-07-01 04:36:26 -0700490
Yauhen Kharuzhy51b76162008-10-29 14:01:16 -0700491 device_init_wakeup(&pdev->dev, 1);
492
Ben Dooks1add6782006-07-01 04:36:26 -0700493 /* register RTC and exit */
494
495 rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
496 THIS_MODULE);
497
498 if (IS_ERR(rtc)) {
499 dev_err(&pdev->dev, "cannot attach rtc\n");
500 ret = PTR_ERR(rtc);
501 goto err_nortc;
502 }
503
Maurus Cuelenaereeaa6e4d2010-06-04 14:14:46 -0700504 s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;
505
Taekgyun Ko051fe542010-07-29 13:00:42 +0900506 /* Check RTC Time */
507
Changhwan Youne1df9622010-10-27 15:33:10 -0700508 s3c_rtc_gettime(NULL, &rtc_tm);
Taekgyun Ko051fe542010-07-29 13:00:42 +0900509
Changhwan Youne1df9622010-10-27 15:33:10 -0700510 if (rtc_valid_tm(&rtc_tm)) {
511 rtc_tm.tm_year = 100;
512 rtc_tm.tm_mon = 0;
513 rtc_tm.tm_mday = 1;
514 rtc_tm.tm_hour = 0;
515 rtc_tm.tm_min = 0;
516 rtc_tm.tm_sec = 0;
517
518 s3c_rtc_settime(NULL, &rtc_tm);
519
520 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
Taekgyun Ko051fe542010-07-29 13:00:42 +0900521 }
522
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700523 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
524 rtc->max_user_freq = 32768;
525 else
526 rtc->max_user_freq = 128;
527
Ben Dooks1add6782006-07-01 04:36:26 -0700528 platform_set_drvdata(pdev, rtc);
Maurus Cuelenaeree893de52010-06-04 14:14:44 -0700529
530 s3c_rtc_setfreq(&pdev->dev, 1);
531
Ben Dooks1add6782006-07-01 04:36:26 -0700532 return 0;
533
534 err_nortc:
535 s3c_rtc_enable(pdev, 0);
Atul Dahiyae48add82010-07-20 12:19:14 +0530536 clk_disable(rtc_clk);
537 clk_put(rtc_clk);
538
539 err_clk:
Ben Dooks1add6782006-07-01 04:36:26 -0700540 iounmap(s3c_rtc_base);
541
542 err_nomap:
543 release_resource(s3c_rtc_mem);
544
545 err_nores:
546 return ret;
547}
548
549#ifdef CONFIG_PM
550
551/* RTC Power management control */
552
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700553static int ticnt_save, ticnt_en_save;
Ben Dooks1add6782006-07-01 04:36:26 -0700554
555static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
556{
Ben Dooks1add6782006-07-01 04:36:26 -0700557 /* save TICNT for anyone using periodic interrupts */
Ben Dooks9a654512006-08-27 01:23:22 -0700558 ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700559 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700560 ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700561 ticnt_en_save &= S3C64XX_RTCCON_TICEN;
562 }
Ben Dooks1add6782006-07-01 04:36:26 -0700563 s3c_rtc_enable(pdev, 0);
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700564
565 if (device_may_wakeup(&pdev->dev))
566 enable_irq_wake(s3c_rtc_alarmno);
567
Ben Dooks1add6782006-07-01 04:36:26 -0700568 return 0;
569}
570
571static int s3c_rtc_resume(struct platform_device *pdev)
572{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700573 unsigned int tmp;
574
Ben Dooks1add6782006-07-01 04:36:26 -0700575 s3c_rtc_enable(pdev, 1);
Ben Dooks9a654512006-08-27 01:23:22 -0700576 writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700577 if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700578 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
579 writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700580 }
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700581
582 if (device_may_wakeup(&pdev->dev))
583 disable_irq_wake(s3c_rtc_alarmno);
584
Ben Dooks1add6782006-07-01 04:36:26 -0700585 return 0;
586}
587#else
588#define s3c_rtc_suspend NULL
589#define s3c_rtc_resume NULL
590#endif
591
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700592static struct platform_device_id s3c_rtc_driver_ids[] = {
593 {
594 .name = "s3c2410-rtc",
595 .driver_data = TYPE_S3C2410,
596 }, {
597 .name = "s3c64xx-rtc",
598 .driver_data = TYPE_S3C64XX,
599 },
600 { }
601};
602
603MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
604
605static struct platform_driver s3c_rtc_driver = {
Ben Dooks1add6782006-07-01 04:36:26 -0700606 .probe = s3c_rtc_probe,
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700607 .remove = __devexit_p(s3c_rtc_remove),
Ben Dooks1add6782006-07-01 04:36:26 -0700608 .suspend = s3c_rtc_suspend,
609 .resume = s3c_rtc_resume,
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700610 .id_table = s3c_rtc_driver_ids,
Ben Dooks1add6782006-07-01 04:36:26 -0700611 .driver = {
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700612 .name = "s3c-rtc",
Ben Dooks1add6782006-07-01 04:36:26 -0700613 .owner = THIS_MODULE,
614 },
615};
616
617static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
618
619static int __init s3c_rtc_init(void)
620{
621 printk(banner);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700622 return platform_driver_register(&s3c_rtc_driver);
Ben Dooks1add6782006-07-01 04:36:26 -0700623}
624
625static void __exit s3c_rtc_exit(void)
626{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700627 platform_driver_unregister(&s3c_rtc_driver);
Ben Dooks1add6782006-07-01 04:36:26 -0700628}
629
630module_init(s3c_rtc_init);
631module_exit(s3c_rtc_exit);
632
633MODULE_DESCRIPTION("Samsung S3C RTC Driver");
634MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
635MODULE_LICENSE("GPL");
Kay Sieversad28a072008-04-10 21:29:25 -0700636MODULE_ALIAS("platform:s3c2410-rtc");