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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>
Thomas Abraham39ce4082011-10-24 14:49:04 +020028#include <linux/of.h>
Ben Dooks1add6782006-07-01 04:36:26 -070029
Russell Kinga09e64f2008-08-05 16:14:15 +010030#include <mach/hardware.h>
Ben Dooks1add6782006-07-01 04:36:26 -070031#include <asm/uaccess.h>
32#include <asm/io.h>
33#include <asm/irq.h>
Ben Dookse2cd00c2008-10-30 10:14:34 +000034#include <plat/regs-rtc.h>
Ben Dooks1add6782006-07-01 04:36:26 -070035
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -070036enum s3c_cpu_type {
37 TYPE_S3C2410,
38 TYPE_S3C64XX,
39};
40
Ben Dooks1add6782006-07-01 04:36:26 -070041/* I have yet to find an S3C implementation with more than one
42 * of these rtc blocks in */
43
44static struct resource *s3c_rtc_mem;
45
Atul Dahiyae48add82010-07-20 12:19:14 +053046static struct clk *rtc_clk;
Ben Dooks1add6782006-07-01 04:36:26 -070047static void __iomem *s3c_rtc_base;
48static int s3c_rtc_alarmno = NO_IRQ;
49static int s3c_rtc_tickno = NO_IRQ;
Ben Dooks52cd4e52011-05-11 15:13:28 -070050static bool wake_en;
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -070051static enum s3c_cpu_type s3c_rtc_cpu_type;
Ben Dooks1add6782006-07-01 04:36:26 -070052
53static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
Ben Dooks1add6782006-07-01 04:36:26 -070054
Donggeun Kim88cee8f2011-09-14 16:22:19 -070055static void s3c_rtc_alarm_clk_enable(bool enable)
56{
57 static DEFINE_SPINLOCK(s3c_rtc_alarm_clk_lock);
58 static bool alarm_clk_enabled;
59 unsigned long irq_flags;
60
61 spin_lock_irqsave(&s3c_rtc_alarm_clk_lock, irq_flags);
62 if (enable) {
63 if (!alarm_clk_enabled) {
64 clk_enable(rtc_clk);
65 alarm_clk_enabled = true;
66 }
67 } else {
68 if (alarm_clk_enabled) {
69 clk_disable(rtc_clk);
70 alarm_clk_enabled = false;
71 }
72 }
73 spin_unlock_irqrestore(&s3c_rtc_alarm_clk_lock, irq_flags);
74}
75
Ben Dooks1add6782006-07-01 04:36:26 -070076/* IRQ Handlers */
77
David Howells7d12e782006-10-05 14:55:46 +010078static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
Ben Dooks1add6782006-07-01 04:36:26 -070079{
80 struct rtc_device *rdev = id;
81
Donggeun Kimcefe4fb2011-07-25 17:13:32 -070082 clk_enable(rtc_clk);
David Brownellab6a2d72007-05-08 00:33:30 -070083 rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
Atul Dahiya2f3478f2010-07-20 16:02:51 +053084
85 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
86 writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
87
Donggeun Kimcefe4fb2011-07-25 17:13:32 -070088 clk_disable(rtc_clk);
Donggeun Kim88cee8f2011-09-14 16:22:19 -070089
90 s3c_rtc_alarm_clk_enable(false);
91
Ben Dooks1add6782006-07-01 04:36:26 -070092 return IRQ_HANDLED;
93}
94
David Howells7d12e782006-10-05 14:55:46 +010095static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
Ben Dooks1add6782006-07-01 04:36:26 -070096{
97 struct rtc_device *rdev = id;
98
Donggeun Kimcefe4fb2011-07-25 17:13:32 -070099 clk_enable(rtc_clk);
Ben Dooks773be7e2008-07-23 21:30:45 -0700100 rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
Atul Dahiya2f3478f2010-07-20 16:02:51 +0530101
102 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
103 writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
104
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700105 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700106 return IRQ_HANDLED;
107}
108
109/* Update control registers */
Axel Lin2ec38a02011-03-04 17:36:19 -0800110static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
Ben Dooks1add6782006-07-01 04:36:26 -0700111{
112 unsigned int tmp;
113
Axel Lin2ec38a02011-03-04 17:36:19 -0800114 pr_debug("%s: aie=%d\n", __func__, enabled);
Ben Dooks1add6782006-07-01 04:36:26 -0700115
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700116 clk_enable(rtc_clk);
Ben Dooks9a654512006-08-27 01:23:22 -0700117 tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
Ben Dooks1add6782006-07-01 04:36:26 -0700118
Axel Lin2ec38a02011-03-04 17:36:19 -0800119 if (enabled)
Ben Dooks1add6782006-07-01 04:36:26 -0700120 tmp |= S3C2410_RTCALM_ALMEN;
121
Ben Dooks9a654512006-08-27 01:23:22 -0700122 writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700123 clk_disable(rtc_clk);
Axel Lin2ec38a02011-03-04 17:36:19 -0800124
Donggeun Kim88cee8f2011-09-14 16:22:19 -0700125 s3c_rtc_alarm_clk_enable(enabled);
126
Axel Lin2ec38a02011-03-04 17:36:19 -0800127 return 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700128}
129
Ben Dooks773be7e2008-07-23 21:30:45 -0700130static int s3c_rtc_setfreq(struct device *dev, int freq)
Ben Dooks1add6782006-07-01 04:36:26 -0700131{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700132 struct platform_device *pdev = to_platform_device(dev);
133 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
134 unsigned int tmp = 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700135
Jonathan Cameron5d2a5032009-01-06 14:42:12 -0800136 if (!is_power_of_2(freq))
137 return -EINVAL;
138
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700139 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700140 spin_lock_irq(&s3c_rtc_pie_lock);
Ben Dooks773be7e2008-07-23 21:30:45 -0700141
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700142 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
143 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
144 tmp &= S3C2410_TICNT_ENABLE;
145 }
146
147 tmp |= (rtc_dev->max_user_freq / freq)-1;
Ben Dooks1add6782006-07-01 04:36:26 -0700148
Atul Dahiya2f3478f2010-07-20 16:02:51 +0530149 writel(tmp, s3c_rtc_base + S3C2410_TICNT);
Ben Dooks1add6782006-07-01 04:36:26 -0700150 spin_unlock_irq(&s3c_rtc_pie_lock);
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700151 clk_disable(rtc_clk);
Ben Dooks773be7e2008-07-23 21:30:45 -0700152
153 return 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700154}
155
156/* Time read/write */
157
158static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
159{
160 unsigned int have_retried = 0;
Ben Dooks9a654512006-08-27 01:23:22 -0700161 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700162
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700163 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700164 retry_get_time:
Ben Dooks9a654512006-08-27 01:23:22 -0700165 rtc_tm->tm_min = readb(base + S3C2410_RTCMIN);
166 rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
167 rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
168 rtc_tm->tm_mon = readb(base + S3C2410_RTCMON);
169 rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
170 rtc_tm->tm_sec = readb(base + S3C2410_RTCSEC);
Ben Dooks1add6782006-07-01 04:36:26 -0700171
172 /* the only way to work out wether the system was mid-update
173 * when we read it is to check the second counter, and if it
174 * is zero, then we re-try the entire read
175 */
176
177 if (rtc_tm->tm_sec == 0 && !have_retried) {
178 have_retried = 1;
179 goto retry_get_time;
180 }
181
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700182 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
183 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
184 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
185 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
186 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
187 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
Ben Dooks1add6782006-07-01 04:36:26 -0700188
189 rtc_tm->tm_year += 100;
MyungJoo Ham4e8896c2011-08-25 15:59:22 -0700190
191 pr_debug("read time %04d.%02d.%02d %02d:%02d:%02d\n",
192 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
193 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
194
Ben Dooks1add6782006-07-01 04:36:26 -0700195 rtc_tm->tm_mon -= 1;
196
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700197 clk_disable(rtc_clk);
Kukjin Kim5b3ffdd2010-10-27 15:33:11 -0700198 return rtc_valid_tm(rtc_tm);
Ben Dooks1add6782006-07-01 04:36:26 -0700199}
200
201static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
202{
Ben Dooks9a654512006-08-27 01:23:22 -0700203 void __iomem *base = s3c_rtc_base;
Ben Dooks641741e2006-08-27 01:23:27 -0700204 int year = tm->tm_year - 100;
Ben Dooks1add6782006-07-01 04:36:26 -0700205
Kukjin Kim30ffc402010-10-27 15:33:09 -0700206 pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
207 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
Ben Dooks9a654512006-08-27 01:23:22 -0700208 tm->tm_hour, tm->tm_min, tm->tm_sec);
209
Ben Dooks641741e2006-08-27 01:23:27 -0700210 /* we get around y2k by simply not supporting it */
211
212 if (year < 0 || year >= 100) {
213 dev_err(dev, "rtc only supports 100 years\n");
214 return -EINVAL;
215 }
216
Jonghwan Choi2dbcd052011-12-08 14:34:02 -0800217 clk_enable(rtc_clk);
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700218 writeb(bin2bcd(tm->tm_sec), base + S3C2410_RTCSEC);
219 writeb(bin2bcd(tm->tm_min), base + S3C2410_RTCMIN);
220 writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
221 writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
222 writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
223 writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700224 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700225
226 return 0;
227}
228
229static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
230{
231 struct rtc_time *alm_tm = &alrm->time;
Ben Dooks9a654512006-08-27 01:23:22 -0700232 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700233 unsigned int alm_en;
234
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700235 clk_enable(rtc_clk);
Ben Dooks9a654512006-08-27 01:23:22 -0700236 alm_tm->tm_sec = readb(base + S3C2410_ALMSEC);
237 alm_tm->tm_min = readb(base + S3C2410_ALMMIN);
238 alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
239 alm_tm->tm_mon = readb(base + S3C2410_ALMMON);
240 alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
241 alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
Ben Dooks1add6782006-07-01 04:36:26 -0700242
Ben Dooks9a654512006-08-27 01:23:22 -0700243 alm_en = readb(base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700244
David Brownella2db8df2006-12-13 00:35:08 -0800245 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
246
Kukjin Kim30ffc402010-10-27 15:33:09 -0700247 pr_debug("read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
Ben Dooks1add6782006-07-01 04:36:26 -0700248 alm_en,
Kukjin Kim30ffc402010-10-27 15:33:09 -0700249 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
Ben Dooks1add6782006-07-01 04:36:26 -0700250 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
251
252
253 /* decode the alarm enable field */
254
255 if (alm_en & S3C2410_RTCALM_SECEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700256 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
Ben Dooks1add6782006-07-01 04:36:26 -0700257 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700258 alm_tm->tm_sec = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700259
260 if (alm_en & S3C2410_RTCALM_MINEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700261 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
Ben Dooks1add6782006-07-01 04:36:26 -0700262 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700263 alm_tm->tm_min = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700264
265 if (alm_en & S3C2410_RTCALM_HOUREN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700266 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
Ben Dooks1add6782006-07-01 04:36:26 -0700267 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700268 alm_tm->tm_hour = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700269
270 if (alm_en & S3C2410_RTCALM_DAYEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700271 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
Ben Dooks1add6782006-07-01 04:36:26 -0700272 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700273 alm_tm->tm_mday = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700274
275 if (alm_en & S3C2410_RTCALM_MONEN) {
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700276 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
Ben Dooks1add6782006-07-01 04:36:26 -0700277 alm_tm->tm_mon -= 1;
278 } else {
Changhwan Youndd061d12010-10-27 15:33:08 -0700279 alm_tm->tm_mon = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700280 }
281
282 if (alm_en & S3C2410_RTCALM_YEAREN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700283 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
Ben Dooks1add6782006-07-01 04:36:26 -0700284 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700285 alm_tm->tm_year = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700286
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700287 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700288 return 0;
289}
290
291static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
292{
293 struct rtc_time *tm = &alrm->time;
Ben Dooks9a654512006-08-27 01:23:22 -0700294 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700295 unsigned int alrm_en;
296
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700297 clk_enable(rtc_clk);
Kukjin Kim30ffc402010-10-27 15:33:09 -0700298 pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
Ben Dooks1add6782006-07-01 04:36:26 -0700299 alrm->enabled,
MyungJoo Ham4e8896c2011-08-25 15:59:22 -0700300 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
Kukjin Kim30ffc402010-10-27 15:33:09 -0700301 tm->tm_hour, tm->tm_min, tm->tm_sec);
Ben Dooks1add6782006-07-01 04:36:26 -0700302
Ben Dooks9a654512006-08-27 01:23:22 -0700303 alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
304 writeb(0x00, base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700305
306 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
307 alrm_en |= S3C2410_RTCALM_SECEN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700308 writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
Ben Dooks1add6782006-07-01 04:36:26 -0700309 }
310
311 if (tm->tm_min < 60 && tm->tm_min >= 0) {
312 alrm_en |= S3C2410_RTCALM_MINEN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700313 writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
Ben Dooks1add6782006-07-01 04:36:26 -0700314 }
315
316 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
317 alrm_en |= S3C2410_RTCALM_HOUREN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700318 writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
Ben Dooks1add6782006-07-01 04:36:26 -0700319 }
320
321 pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
322
Ben Dooks9a654512006-08-27 01:23:22 -0700323 writeb(alrm_en, base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700324
Axel Lin2ec38a02011-03-04 17:36:19 -0800325 s3c_rtc_setaie(dev, alrm->enabled);
Ben Dooks1add6782006-07-01 04:36:26 -0700326
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700327 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700328 return 0;
329}
330
Ben Dooks1add6782006-07-01 04:36:26 -0700331static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
332{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700333 unsigned int ticnt;
Ben Dooks1add6782006-07-01 04:36:26 -0700334
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700335 clk_enable(rtc_clk);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700336 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700337 ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700338 ticnt &= S3C64XX_RTCCON_TICEN;
339 } else {
340 ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
341 ticnt &= S3C2410_TICNT_ENABLE;
342 }
343
344 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700345 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700346 return 0;
347}
348
David Brownellff8371a2006-09-30 23:28:17 -0700349static const struct rtc_class_ops s3c_rtcops = {
Ben Dooks1add6782006-07-01 04:36:26 -0700350 .read_time = s3c_rtc_gettime,
351 .set_time = s3c_rtc_settime,
352 .read_alarm = s3c_rtc_getalarm,
353 .set_alarm = s3c_rtc_setalarm,
Changhwan Youne6eb5242010-10-27 15:33:09 -0700354 .proc = s3c_rtc_proc,
355 .alarm_irq_enable = s3c_rtc_setaie,
Ben Dooks1add6782006-07-01 04:36:26 -0700356};
357
358static void s3c_rtc_enable(struct platform_device *pdev, int en)
359{
Ben Dooks9a654512006-08-27 01:23:22 -0700360 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700361 unsigned int tmp;
362
363 if (s3c_rtc_base == NULL)
364 return;
365
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700366 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700367 if (!en) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700368 tmp = readw(base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700369 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
370 tmp &= ~S3C64XX_RTCCON_TICEN;
371 tmp &= ~S3C2410_RTCCON_RTCEN;
Changhwan Younf61ae672010-10-27 15:33:06 -0700372 writew(tmp, base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700373
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700374 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
375 tmp = readb(base + S3C2410_TICNT);
376 tmp &= ~S3C2410_TICNT_ENABLE;
377 writeb(tmp, base + S3C2410_TICNT);
378 }
Ben Dooks1add6782006-07-01 04:36:26 -0700379 } else {
380 /* re-enable the device, and check it is ok */
381
Changhwan Younf61ae672010-10-27 15:33:06 -0700382 if ((readw(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
Ben Dooks1add6782006-07-01 04:36:26 -0700383 dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
384
Changhwan Younf61ae672010-10-27 15:33:06 -0700385 tmp = readw(base + S3C2410_RTCCON);
386 writew(tmp | S3C2410_RTCCON_RTCEN,
387 base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700388 }
389
Changhwan Younf61ae672010-10-27 15:33:06 -0700390 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {
Ben Dooks1add6782006-07-01 04:36:26 -0700391 dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
392
Changhwan Younf61ae672010-10-27 15:33:06 -0700393 tmp = readw(base + S3C2410_RTCCON);
394 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
395 base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700396 }
397
Changhwan Younf61ae672010-10-27 15:33:06 -0700398 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {
Ben Dooks1add6782006-07-01 04:36:26 -0700399 dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
400
Changhwan Younf61ae672010-10-27 15:33:06 -0700401 tmp = readw(base + S3C2410_RTCCON);
402 writew(tmp & ~S3C2410_RTCCON_CLKRST,
403 base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700404 }
405 }
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700406 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700407}
408
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700409static int __devexit s3c_rtc_remove(struct platform_device *dev)
Ben Dooks1add6782006-07-01 04:36:26 -0700410{
411 struct rtc_device *rtc = platform_get_drvdata(dev);
412
MyungJoo Ham62d17602011-08-25 15:59:24 -0700413 free_irq(s3c_rtc_alarmno, rtc);
414 free_irq(s3c_rtc_tickno, rtc);
415
Ben Dooks1add6782006-07-01 04:36:26 -0700416 platform_set_drvdata(dev, NULL);
417 rtc_device_unregister(rtc);
418
Axel Lin2ec38a02011-03-04 17:36:19 -0800419 s3c_rtc_setaie(&dev->dev, 0);
Ben Dooks1add6782006-07-01 04:36:26 -0700420
Atul Dahiyae48add82010-07-20 12:19:14 +0530421 clk_put(rtc_clk);
422 rtc_clk = NULL;
423
Ben Dooks1add6782006-07-01 04:36:26 -0700424 iounmap(s3c_rtc_base);
425 release_resource(s3c_rtc_mem);
426 kfree(s3c_rtc_mem);
427
428 return 0;
429}
430
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700431static int __devinit s3c_rtc_probe(struct platform_device *pdev)
Ben Dooks1add6782006-07-01 04:36:26 -0700432{
433 struct rtc_device *rtc;
Changhwan Youne1df9622010-10-27 15:33:10 -0700434 struct rtc_time rtc_tm;
Ben Dooks1add6782006-07-01 04:36:26 -0700435 struct resource *res;
436 int ret;
437
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700438 pr_debug("%s: probe=%p\n", __func__, pdev);
Ben Dooks1add6782006-07-01 04:36:26 -0700439
440 /* find the IRQs */
441
442 s3c_rtc_tickno = platform_get_irq(pdev, 1);
443 if (s3c_rtc_tickno < 0) {
444 dev_err(&pdev->dev, "no irq for rtc tick\n");
445 return -ENOENT;
446 }
447
448 s3c_rtc_alarmno = platform_get_irq(pdev, 0);
449 if (s3c_rtc_alarmno < 0) {
450 dev_err(&pdev->dev, "no irq for alarm\n");
451 return -ENOENT;
452 }
453
454 pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
455 s3c_rtc_tickno, s3c_rtc_alarmno);
456
457 /* get the memory region */
458
459 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
460 if (res == NULL) {
461 dev_err(&pdev->dev, "failed to get memory region resource\n");
462 return -ENOENT;
463 }
464
Joe Perches28f65c12011-06-09 09:13:32 -0700465 s3c_rtc_mem = request_mem_region(res->start, resource_size(res),
Ben Dooks9a654512006-08-27 01:23:22 -0700466 pdev->name);
Ben Dooks1add6782006-07-01 04:36:26 -0700467
468 if (s3c_rtc_mem == NULL) {
469 dev_err(&pdev->dev, "failed to reserve memory region\n");
470 ret = -ENOENT;
471 goto err_nores;
472 }
473
Joe Perches28f65c12011-06-09 09:13:32 -0700474 s3c_rtc_base = ioremap(res->start, resource_size(res));
Ben Dooks1add6782006-07-01 04:36:26 -0700475 if (s3c_rtc_base == NULL) {
476 dev_err(&pdev->dev, "failed ioremap()\n");
477 ret = -EINVAL;
478 goto err_nomap;
479 }
480
Atul Dahiyae48add82010-07-20 12:19:14 +0530481 rtc_clk = clk_get(&pdev->dev, "rtc");
482 if (IS_ERR(rtc_clk)) {
483 dev_err(&pdev->dev, "failed to find rtc clock source\n");
484 ret = PTR_ERR(rtc_clk);
485 rtc_clk = NULL;
486 goto err_clk;
487 }
488
489 clk_enable(rtc_clk);
490
Ben Dooks1add6782006-07-01 04:36:26 -0700491 /* check to see if everything is setup correctly */
492
493 s3c_rtc_enable(pdev, 1);
494
Changhwan Younf61ae672010-10-27 15:33:06 -0700495 pr_debug("s3c2410_rtc: RTCCON=%02x\n",
496 readw(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
Thomas Abraham39ce4082011-10-24 14:49:04 +0200511#ifdef CONFIG_OF
512 if (pdev->dev.of_node)
513 s3c_rtc_cpu_type = of_device_is_compatible(pdev->dev.of_node,
514 "samsung,s3c6410-rtc") ? TYPE_S3C64XX : TYPE_S3C2410;
515 else
516#endif
517 s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;
Maurus Cuelenaereeaa6e4d2010-06-04 14:14:46 -0700518
Taekgyun Ko051fe542010-07-29 13:00:42 +0900519 /* Check RTC Time */
520
Changhwan Youne1df9622010-10-27 15:33:10 -0700521 s3c_rtc_gettime(NULL, &rtc_tm);
Taekgyun Ko051fe542010-07-29 13:00:42 +0900522
Changhwan Youne1df9622010-10-27 15:33:10 -0700523 if (rtc_valid_tm(&rtc_tm)) {
524 rtc_tm.tm_year = 100;
525 rtc_tm.tm_mon = 0;
526 rtc_tm.tm_mday = 1;
527 rtc_tm.tm_hour = 0;
528 rtc_tm.tm_min = 0;
529 rtc_tm.tm_sec = 0;
530
531 s3c_rtc_settime(NULL, &rtc_tm);
532
533 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
Taekgyun Ko051fe542010-07-29 13:00:42 +0900534 }
535
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700536 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
537 rtc->max_user_freq = 32768;
538 else
539 rtc->max_user_freq = 128;
540
Ben Dooks1add6782006-07-01 04:36:26 -0700541 platform_set_drvdata(pdev, rtc);
Maurus Cuelenaeree893de52010-06-04 14:14:44 -0700542
543 s3c_rtc_setfreq(&pdev->dev, 1);
544
MyungJoo Ham62d17602011-08-25 15:59:24 -0700545 ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
546 IRQF_DISABLED, "s3c2410-rtc alarm", rtc);
547 if (ret) {
548 dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
549 goto err_alarm_irq;
550 }
551
552 ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
553 IRQF_DISABLED, "s3c2410-rtc tick", rtc);
554 if (ret) {
555 dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
556 free_irq(s3c_rtc_alarmno, rtc);
557 goto err_tick_irq;
558 }
559
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700560 clk_disable(rtc_clk);
561
Ben Dooks1add6782006-07-01 04:36:26 -0700562 return 0;
563
MyungJoo Ham62d17602011-08-25 15:59:24 -0700564 err_tick_irq:
565 free_irq(s3c_rtc_alarmno, rtc);
566
567 err_alarm_irq:
568 platform_set_drvdata(pdev, NULL);
569 rtc_device_unregister(rtc);
570
Ben Dooks1add6782006-07-01 04:36:26 -0700571 err_nortc:
572 s3c_rtc_enable(pdev, 0);
Atul Dahiyae48add82010-07-20 12:19:14 +0530573 clk_disable(rtc_clk);
574 clk_put(rtc_clk);
575
576 err_clk:
Ben Dooks1add6782006-07-01 04:36:26 -0700577 iounmap(s3c_rtc_base);
578
579 err_nomap:
580 release_resource(s3c_rtc_mem);
581
582 err_nores:
583 return ret;
584}
585
586#ifdef CONFIG_PM
587
588/* RTC Power management control */
589
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700590static int ticnt_save, ticnt_en_save;
Ben Dooks1add6782006-07-01 04:36:26 -0700591
592static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
593{
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700594 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700595 /* save TICNT for anyone using periodic interrupts */
Ben Dooks9a654512006-08-27 01:23:22 -0700596 ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700597 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700598 ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700599 ticnt_en_save &= S3C64XX_RTCCON_TICEN;
600 }
Ben Dooks1add6782006-07-01 04:36:26 -0700601 s3c_rtc_enable(pdev, 0);
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700602
Ben Dooks52cd4e52011-05-11 15:13:28 -0700603 if (device_may_wakeup(&pdev->dev) && !wake_en) {
604 if (enable_irq_wake(s3c_rtc_alarmno) == 0)
605 wake_en = true;
606 else
607 dev_err(&pdev->dev, "enable_irq_wake failed\n");
608 }
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700609 clk_disable(rtc_clk);
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700610
Ben Dooks1add6782006-07-01 04:36:26 -0700611 return 0;
612}
613
614static int s3c_rtc_resume(struct platform_device *pdev)
615{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700616 unsigned int tmp;
617
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700618 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700619 s3c_rtc_enable(pdev, 1);
Ben Dooks9a654512006-08-27 01:23:22 -0700620 writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700621 if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700622 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
623 writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700624 }
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700625
Ben Dooks52cd4e52011-05-11 15:13:28 -0700626 if (device_may_wakeup(&pdev->dev) && wake_en) {
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700627 disable_irq_wake(s3c_rtc_alarmno);
Ben Dooks52cd4e52011-05-11 15:13:28 -0700628 wake_en = false;
629 }
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700630 clk_disable(rtc_clk);
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700631
Ben Dooks1add6782006-07-01 04:36:26 -0700632 return 0;
633}
634#else
635#define s3c_rtc_suspend NULL
636#define s3c_rtc_resume NULL
637#endif
638
Thomas Abraham39ce4082011-10-24 14:49:04 +0200639#ifdef CONFIG_OF
640static const struct of_device_id s3c_rtc_dt_match[] = {
641 { .compatible = "samsung,s3c2410-rtc" },
642 { .compatible = "samsung,s3c6410-rtc" },
643 {},
644};
645MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
646#else
647#define s3c_rtc_dt_match NULL
648#endif
649
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700650static struct platform_device_id s3c_rtc_driver_ids[] = {
651 {
652 .name = "s3c2410-rtc",
653 .driver_data = TYPE_S3C2410,
654 }, {
655 .name = "s3c64xx-rtc",
656 .driver_data = TYPE_S3C64XX,
657 },
658 { }
659};
660
661MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
662
663static struct platform_driver s3c_rtc_driver = {
Ben Dooks1add6782006-07-01 04:36:26 -0700664 .probe = s3c_rtc_probe,
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700665 .remove = __devexit_p(s3c_rtc_remove),
Ben Dooks1add6782006-07-01 04:36:26 -0700666 .suspend = s3c_rtc_suspend,
667 .resume = s3c_rtc_resume,
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700668 .id_table = s3c_rtc_driver_ids,
Ben Dooks1add6782006-07-01 04:36:26 -0700669 .driver = {
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700670 .name = "s3c-rtc",
Ben Dooks1add6782006-07-01 04:36:26 -0700671 .owner = THIS_MODULE,
Thomas Abraham39ce4082011-10-24 14:49:04 +0200672 .of_match_table = s3c_rtc_dt_match,
Ben Dooks1add6782006-07-01 04:36:26 -0700673 },
674};
675
Axel Lin0c4eae62012-01-10 15:10:48 -0800676module_platform_driver(s3c_rtc_driver);
Ben Dooks1add6782006-07-01 04:36:26 -0700677
678MODULE_DESCRIPTION("Samsung S3C RTC Driver");
679MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
680MODULE_LICENSE("GPL");
Kay Sieversad28a072008-04-10 21:29:25 -0700681MODULE_ALIAS("platform:s3c2410-rtc");