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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,
Heiko Stuebner25c1a242011-12-24 10:52:19 +090038 TYPE_S3C2416,
39 TYPE_S3C2443,
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -070040 TYPE_S3C64XX,
41};
42
Tushar Beherac3cba922012-04-12 12:49:14 -070043struct s3c_rtc_drv_data {
44 int cpu_type;
45};
46
Ben Dooks1add6782006-07-01 04:36:26 -070047/* I have yet to find an S3C implementation with more than one
48 * of these rtc blocks in */
49
50static struct resource *s3c_rtc_mem;
51
Atul Dahiyae48add82010-07-20 12:19:14 +053052static struct clk *rtc_clk;
Ben Dooks1add6782006-07-01 04:36:26 -070053static void __iomem *s3c_rtc_base;
54static int s3c_rtc_alarmno = NO_IRQ;
55static int s3c_rtc_tickno = NO_IRQ;
Ben Dooks52cd4e52011-05-11 15:13:28 -070056static bool wake_en;
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -070057static enum s3c_cpu_type s3c_rtc_cpu_type;
Ben Dooks1add6782006-07-01 04:36:26 -070058
59static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
Ben Dooks1add6782006-07-01 04:36:26 -070060
Donggeun Kim88cee8f2011-09-14 16:22:19 -070061static void s3c_rtc_alarm_clk_enable(bool enable)
62{
63 static DEFINE_SPINLOCK(s3c_rtc_alarm_clk_lock);
64 static bool alarm_clk_enabled;
65 unsigned long irq_flags;
66
67 spin_lock_irqsave(&s3c_rtc_alarm_clk_lock, irq_flags);
68 if (enable) {
69 if (!alarm_clk_enabled) {
70 clk_enable(rtc_clk);
71 alarm_clk_enabled = true;
72 }
73 } else {
74 if (alarm_clk_enabled) {
75 clk_disable(rtc_clk);
76 alarm_clk_enabled = false;
77 }
78 }
79 spin_unlock_irqrestore(&s3c_rtc_alarm_clk_lock, irq_flags);
80}
81
Ben Dooks1add6782006-07-01 04:36:26 -070082/* IRQ Handlers */
83
David Howells7d12e782006-10-05 14:55:46 +010084static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
Ben Dooks1add6782006-07-01 04:36:26 -070085{
86 struct rtc_device *rdev = id;
87
Donggeun Kimcefe4fb2011-07-25 17:13:32 -070088 clk_enable(rtc_clk);
David Brownellab6a2d72007-05-08 00:33:30 -070089 rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
Atul Dahiya2f3478f2010-07-20 16:02:51 +053090
91 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
92 writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
93
Donggeun Kimcefe4fb2011-07-25 17:13:32 -070094 clk_disable(rtc_clk);
Donggeun Kim88cee8f2011-09-14 16:22:19 -070095
96 s3c_rtc_alarm_clk_enable(false);
97
Ben Dooks1add6782006-07-01 04:36:26 -070098 return IRQ_HANDLED;
99}
100
David Howells7d12e782006-10-05 14:55:46 +0100101static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
Ben Dooks1add6782006-07-01 04:36:26 -0700102{
103 struct rtc_device *rdev = id;
104
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700105 clk_enable(rtc_clk);
Ben Dooks773be7e2008-07-23 21:30:45 -0700106 rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
Atul Dahiya2f3478f2010-07-20 16:02:51 +0530107
108 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
109 writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
110
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700111 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700112 return IRQ_HANDLED;
113}
114
115/* Update control registers */
Axel Lin2ec38a02011-03-04 17:36:19 -0800116static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
Ben Dooks1add6782006-07-01 04:36:26 -0700117{
118 unsigned int tmp;
119
Axel Lin2ec38a02011-03-04 17:36:19 -0800120 pr_debug("%s: aie=%d\n", __func__, enabled);
Ben Dooks1add6782006-07-01 04:36:26 -0700121
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700122 clk_enable(rtc_clk);
Ben Dooks9a654512006-08-27 01:23:22 -0700123 tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
Ben Dooks1add6782006-07-01 04:36:26 -0700124
Axel Lin2ec38a02011-03-04 17:36:19 -0800125 if (enabled)
Ben Dooks1add6782006-07-01 04:36:26 -0700126 tmp |= S3C2410_RTCALM_ALMEN;
127
Ben Dooks9a654512006-08-27 01:23:22 -0700128 writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700129 clk_disable(rtc_clk);
Axel Lin2ec38a02011-03-04 17:36:19 -0800130
Donggeun Kim88cee8f2011-09-14 16:22:19 -0700131 s3c_rtc_alarm_clk_enable(enabled);
132
Axel Lin2ec38a02011-03-04 17:36:19 -0800133 return 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700134}
135
Ben Dooks773be7e2008-07-23 21:30:45 -0700136static int s3c_rtc_setfreq(struct device *dev, int freq)
Ben Dooks1add6782006-07-01 04:36:26 -0700137{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700138 struct platform_device *pdev = to_platform_device(dev);
139 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
140 unsigned int tmp = 0;
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900141 int val;
Ben Dooks1add6782006-07-01 04:36:26 -0700142
Jonathan Cameron5d2a5032009-01-06 14:42:12 -0800143 if (!is_power_of_2(freq))
144 return -EINVAL;
145
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700146 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700147 spin_lock_irq(&s3c_rtc_pie_lock);
Ben Dooks773be7e2008-07-23 21:30:45 -0700148
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900149 if (s3c_rtc_cpu_type != TYPE_S3C64XX) {
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700150 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
151 tmp &= S3C2410_TICNT_ENABLE;
152 }
153
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900154 val = (rtc_dev->max_user_freq / freq) - 1;
155
156 if (s3c_rtc_cpu_type == TYPE_S3C2416 || s3c_rtc_cpu_type == TYPE_S3C2443) {
157 tmp |= S3C2443_TICNT_PART(val);
158 writel(S3C2443_TICNT1_PART(val), s3c_rtc_base + S3C2443_TICNT1);
159
160 if (s3c_rtc_cpu_type == TYPE_S3C2416)
161 writel(S3C2416_TICNT2_PART(val), s3c_rtc_base + S3C2416_TICNT2);
162 } else {
163 tmp |= val;
164 }
Ben Dooks1add6782006-07-01 04:36:26 -0700165
Atul Dahiya2f3478f2010-07-20 16:02:51 +0530166 writel(tmp, s3c_rtc_base + S3C2410_TICNT);
Ben Dooks1add6782006-07-01 04:36:26 -0700167 spin_unlock_irq(&s3c_rtc_pie_lock);
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700168 clk_disable(rtc_clk);
Ben Dooks773be7e2008-07-23 21:30:45 -0700169
170 return 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700171}
172
173/* Time read/write */
174
175static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
176{
177 unsigned int have_retried = 0;
Ben Dooks9a654512006-08-27 01:23:22 -0700178 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700179
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700180 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700181 retry_get_time:
Ben Dooks9a654512006-08-27 01:23:22 -0700182 rtc_tm->tm_min = readb(base + S3C2410_RTCMIN);
183 rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
184 rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
185 rtc_tm->tm_mon = readb(base + S3C2410_RTCMON);
186 rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
187 rtc_tm->tm_sec = readb(base + S3C2410_RTCSEC);
Ben Dooks1add6782006-07-01 04:36:26 -0700188
189 /* the only way to work out wether the system was mid-update
190 * when we read it is to check the second counter, and if it
191 * is zero, then we re-try the entire read
192 */
193
194 if (rtc_tm->tm_sec == 0 && !have_retried) {
195 have_retried = 1;
196 goto retry_get_time;
197 }
198
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700199 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
200 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
201 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
202 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
203 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
204 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
Ben Dooks1add6782006-07-01 04:36:26 -0700205
206 rtc_tm->tm_year += 100;
MyungJoo Ham4e8896c2011-08-25 15:59:22 -0700207
208 pr_debug("read time %04d.%02d.%02d %02d:%02d:%02d\n",
209 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
210 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
211
Ben Dooks1add6782006-07-01 04:36:26 -0700212 rtc_tm->tm_mon -= 1;
213
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700214 clk_disable(rtc_clk);
Kukjin Kim5b3ffdd2010-10-27 15:33:11 -0700215 return rtc_valid_tm(rtc_tm);
Ben Dooks1add6782006-07-01 04:36:26 -0700216}
217
218static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
219{
Ben Dooks9a654512006-08-27 01:23:22 -0700220 void __iomem *base = s3c_rtc_base;
Ben Dooks641741e2006-08-27 01:23:27 -0700221 int year = tm->tm_year - 100;
Ben Dooks1add6782006-07-01 04:36:26 -0700222
Kukjin Kim30ffc402010-10-27 15:33:09 -0700223 pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
224 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
Ben Dooks9a654512006-08-27 01:23:22 -0700225 tm->tm_hour, tm->tm_min, tm->tm_sec);
226
Ben Dooks641741e2006-08-27 01:23:27 -0700227 /* we get around y2k by simply not supporting it */
228
229 if (year < 0 || year >= 100) {
230 dev_err(dev, "rtc only supports 100 years\n");
231 return -EINVAL;
232 }
233
Jonghwan Choi2dbcd052011-12-08 14:34:02 -0800234 clk_enable(rtc_clk);
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700235 writeb(bin2bcd(tm->tm_sec), base + S3C2410_RTCSEC);
236 writeb(bin2bcd(tm->tm_min), base + S3C2410_RTCMIN);
237 writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
238 writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
239 writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
240 writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700241 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700242
243 return 0;
244}
245
246static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
247{
248 struct rtc_time *alm_tm = &alrm->time;
Ben Dooks9a654512006-08-27 01:23:22 -0700249 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700250 unsigned int alm_en;
251
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700252 clk_enable(rtc_clk);
Ben Dooks9a654512006-08-27 01:23:22 -0700253 alm_tm->tm_sec = readb(base + S3C2410_ALMSEC);
254 alm_tm->tm_min = readb(base + S3C2410_ALMMIN);
255 alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
256 alm_tm->tm_mon = readb(base + S3C2410_ALMMON);
257 alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
258 alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
Ben Dooks1add6782006-07-01 04:36:26 -0700259
Ben Dooks9a654512006-08-27 01:23:22 -0700260 alm_en = readb(base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700261
David Brownella2db8df2006-12-13 00:35:08 -0800262 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
263
Kukjin Kim30ffc402010-10-27 15:33:09 -0700264 pr_debug("read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
Ben Dooks1add6782006-07-01 04:36:26 -0700265 alm_en,
Kukjin Kim30ffc402010-10-27 15:33:09 -0700266 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
Ben Dooks1add6782006-07-01 04:36:26 -0700267 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
268
269
270 /* decode the alarm enable field */
271
272 if (alm_en & S3C2410_RTCALM_SECEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700273 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
Ben Dooks1add6782006-07-01 04:36:26 -0700274 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700275 alm_tm->tm_sec = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700276
277 if (alm_en & S3C2410_RTCALM_MINEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700278 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
Ben Dooks1add6782006-07-01 04:36:26 -0700279 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700280 alm_tm->tm_min = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700281
282 if (alm_en & S3C2410_RTCALM_HOUREN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700283 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
Ben Dooks1add6782006-07-01 04:36:26 -0700284 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700285 alm_tm->tm_hour = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700286
287 if (alm_en & S3C2410_RTCALM_DAYEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700288 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
Ben Dooks1add6782006-07-01 04:36:26 -0700289 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700290 alm_tm->tm_mday = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700291
292 if (alm_en & S3C2410_RTCALM_MONEN) {
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700293 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
Ben Dooks1add6782006-07-01 04:36:26 -0700294 alm_tm->tm_mon -= 1;
295 } else {
Changhwan Youndd061d12010-10-27 15:33:08 -0700296 alm_tm->tm_mon = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700297 }
298
299 if (alm_en & S3C2410_RTCALM_YEAREN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700300 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
Ben Dooks1add6782006-07-01 04:36:26 -0700301 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700302 alm_tm->tm_year = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700303
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700304 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700305 return 0;
306}
307
308static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
309{
310 struct rtc_time *tm = &alrm->time;
Ben Dooks9a654512006-08-27 01:23:22 -0700311 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700312 unsigned int alrm_en;
313
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700314 clk_enable(rtc_clk);
Kukjin Kim30ffc402010-10-27 15:33:09 -0700315 pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
Ben Dooks1add6782006-07-01 04:36:26 -0700316 alrm->enabled,
MyungJoo Ham4e8896c2011-08-25 15:59:22 -0700317 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
Kukjin Kim30ffc402010-10-27 15:33:09 -0700318 tm->tm_hour, tm->tm_min, tm->tm_sec);
Ben Dooks1add6782006-07-01 04:36:26 -0700319
Ben Dooks9a654512006-08-27 01:23:22 -0700320 alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
321 writeb(0x00, base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700322
323 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
324 alrm_en |= S3C2410_RTCALM_SECEN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700325 writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
Ben Dooks1add6782006-07-01 04:36:26 -0700326 }
327
328 if (tm->tm_min < 60 && tm->tm_min >= 0) {
329 alrm_en |= S3C2410_RTCALM_MINEN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700330 writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
Ben Dooks1add6782006-07-01 04:36:26 -0700331 }
332
333 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
334 alrm_en |= S3C2410_RTCALM_HOUREN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700335 writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
Ben Dooks1add6782006-07-01 04:36:26 -0700336 }
337
338 pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
339
Ben Dooks9a654512006-08-27 01:23:22 -0700340 writeb(alrm_en, base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700341
Axel Lin2ec38a02011-03-04 17:36:19 -0800342 s3c_rtc_setaie(dev, alrm->enabled);
Ben Dooks1add6782006-07-01 04:36:26 -0700343
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700344 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700345 return 0;
346}
347
Ben Dooks1add6782006-07-01 04:36:26 -0700348static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
349{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700350 unsigned int ticnt;
Ben Dooks1add6782006-07-01 04:36:26 -0700351
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700352 clk_enable(rtc_clk);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700353 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700354 ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700355 ticnt &= S3C64XX_RTCCON_TICEN;
356 } else {
357 ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
358 ticnt &= S3C2410_TICNT_ENABLE;
359 }
360
361 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700362 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700363 return 0;
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 .read_time = s3c_rtc_gettime,
368 .set_time = s3c_rtc_settime,
369 .read_alarm = s3c_rtc_getalarm,
370 .set_alarm = s3c_rtc_setalarm,
Changhwan Youne6eb5242010-10-27 15:33:09 -0700371 .proc = s3c_rtc_proc,
372 .alarm_irq_enable = s3c_rtc_setaie,
Ben Dooks1add6782006-07-01 04:36:26 -0700373};
374
375static void s3c_rtc_enable(struct platform_device *pdev, int en)
376{
Ben Dooks9a654512006-08-27 01:23:22 -0700377 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700378 unsigned int tmp;
379
380 if (s3c_rtc_base == NULL)
381 return;
382
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700383 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700384 if (!en) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700385 tmp = readw(base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700386 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
387 tmp &= ~S3C64XX_RTCCON_TICEN;
388 tmp &= ~S3C2410_RTCCON_RTCEN;
Changhwan Younf61ae672010-10-27 15:33:06 -0700389 writew(tmp, base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700390
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900391 if (s3c_rtc_cpu_type != TYPE_S3C64XX) {
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700392 tmp = readb(base + S3C2410_TICNT);
393 tmp &= ~S3C2410_TICNT_ENABLE;
394 writeb(tmp, base + S3C2410_TICNT);
395 }
Ben Dooks1add6782006-07-01 04:36:26 -0700396 } else {
397 /* re-enable the device, and check it is ok */
398
Changhwan Younf61ae672010-10-27 15:33:06 -0700399 if ((readw(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
Ben Dooks1add6782006-07-01 04:36:26 -0700400 dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
401
Changhwan Younf61ae672010-10-27 15:33:06 -0700402 tmp = readw(base + S3C2410_RTCCON);
403 writew(tmp | S3C2410_RTCCON_RTCEN,
404 base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700405 }
406
Changhwan Younf61ae672010-10-27 15:33:06 -0700407 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {
Ben Dooks1add6782006-07-01 04:36:26 -0700408 dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
409
Changhwan Younf61ae672010-10-27 15:33:06 -0700410 tmp = readw(base + S3C2410_RTCCON);
411 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
412 base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700413 }
414
Changhwan Younf61ae672010-10-27 15:33:06 -0700415 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {
Ben Dooks1add6782006-07-01 04:36:26 -0700416 dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
417
Changhwan Younf61ae672010-10-27 15:33:06 -0700418 tmp = readw(base + S3C2410_RTCCON);
419 writew(tmp & ~S3C2410_RTCCON_CLKRST,
420 base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700421 }
422 }
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700423 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700424}
425
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700426static int __devexit s3c_rtc_remove(struct platform_device *dev)
Ben Dooks1add6782006-07-01 04:36:26 -0700427{
428 struct rtc_device *rtc = platform_get_drvdata(dev);
429
MyungJoo Ham62d17602011-08-25 15:59:24 -0700430 free_irq(s3c_rtc_alarmno, rtc);
431 free_irq(s3c_rtc_tickno, rtc);
432
Ben Dooks1add6782006-07-01 04:36:26 -0700433 platform_set_drvdata(dev, NULL);
434 rtc_device_unregister(rtc);
435
Axel Lin2ec38a02011-03-04 17:36:19 -0800436 s3c_rtc_setaie(&dev->dev, 0);
Ben Dooks1add6782006-07-01 04:36:26 -0700437
Atul Dahiyae48add82010-07-20 12:19:14 +0530438 clk_put(rtc_clk);
439 rtc_clk = NULL;
440
Ben Dooks1add6782006-07-01 04:36:26 -0700441 iounmap(s3c_rtc_base);
442 release_resource(s3c_rtc_mem);
443 kfree(s3c_rtc_mem);
444
445 return 0;
446}
447
Heiko Stuebnerd2524ca2011-12-24 10:52:14 +0900448static const struct of_device_id s3c_rtc_dt_match[];
449
450static inline int s3c_rtc_get_driver_data(struct platform_device *pdev)
451{
452#ifdef CONFIG_OF
Tushar Beherac3cba922012-04-12 12:49:14 -0700453 struct s3c_rtc_drv_data *data;
Heiko Stuebnerd2524ca2011-12-24 10:52:14 +0900454 if (pdev->dev.of_node) {
455 const struct of_device_id *match;
456 match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
Tushar Beherac3cba922012-04-12 12:49:14 -0700457 data = (struct s3c_rtc_drv_data *) match->data;
458 return data->cpu_type;
Heiko Stuebnerd2524ca2011-12-24 10:52:14 +0900459 }
460#endif
461 return platform_get_device_id(pdev)->driver_data;
462}
463
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700464static int __devinit s3c_rtc_probe(struct platform_device *pdev)
Ben Dooks1add6782006-07-01 04:36:26 -0700465{
466 struct rtc_device *rtc;
Changhwan Youne1df9622010-10-27 15:33:10 -0700467 struct rtc_time rtc_tm;
Ben Dooks1add6782006-07-01 04:36:26 -0700468 struct resource *res;
469 int ret;
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900470 int tmp;
Ben Dooks1add6782006-07-01 04:36:26 -0700471
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700472 pr_debug("%s: probe=%p\n", __func__, pdev);
Ben Dooks1add6782006-07-01 04:36:26 -0700473
474 /* find the IRQs */
475
476 s3c_rtc_tickno = platform_get_irq(pdev, 1);
477 if (s3c_rtc_tickno < 0) {
478 dev_err(&pdev->dev, "no irq for rtc tick\n");
479 return -ENOENT;
480 }
481
482 s3c_rtc_alarmno = platform_get_irq(pdev, 0);
483 if (s3c_rtc_alarmno < 0) {
484 dev_err(&pdev->dev, "no irq for alarm\n");
485 return -ENOENT;
486 }
487
488 pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
489 s3c_rtc_tickno, s3c_rtc_alarmno);
490
491 /* get the memory region */
492
493 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
494 if (res == NULL) {
495 dev_err(&pdev->dev, "failed to get memory region resource\n");
496 return -ENOENT;
497 }
498
Joe Perches28f65c112011-06-09 09:13:32 -0700499 s3c_rtc_mem = request_mem_region(res->start, resource_size(res),
Ben Dooks9a654512006-08-27 01:23:22 -0700500 pdev->name);
Ben Dooks1add6782006-07-01 04:36:26 -0700501
502 if (s3c_rtc_mem == NULL) {
503 dev_err(&pdev->dev, "failed to reserve memory region\n");
504 ret = -ENOENT;
505 goto err_nores;
506 }
507
Joe Perches28f65c112011-06-09 09:13:32 -0700508 s3c_rtc_base = ioremap(res->start, resource_size(res));
Ben Dooks1add6782006-07-01 04:36:26 -0700509 if (s3c_rtc_base == NULL) {
510 dev_err(&pdev->dev, "failed ioremap()\n");
511 ret = -EINVAL;
512 goto err_nomap;
513 }
514
Atul Dahiyae48add82010-07-20 12:19:14 +0530515 rtc_clk = clk_get(&pdev->dev, "rtc");
516 if (IS_ERR(rtc_clk)) {
517 dev_err(&pdev->dev, "failed to find rtc clock source\n");
518 ret = PTR_ERR(rtc_clk);
519 rtc_clk = NULL;
520 goto err_clk;
521 }
522
523 clk_enable(rtc_clk);
524
Ben Dooks1add6782006-07-01 04:36:26 -0700525 /* check to see if everything is setup correctly */
526
527 s3c_rtc_enable(pdev, 1);
528
Changhwan Younf61ae672010-10-27 15:33:06 -0700529 pr_debug("s3c2410_rtc: RTCCON=%02x\n",
530 readw(s3c_rtc_base + S3C2410_RTCCON));
Ben Dooks1add6782006-07-01 04:36:26 -0700531
Yauhen Kharuzhy51b76162008-10-29 14:01:16 -0700532 device_init_wakeup(&pdev->dev, 1);
533
Ben Dooks1add6782006-07-01 04:36:26 -0700534 /* register RTC and exit */
535
536 rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
537 THIS_MODULE);
538
539 if (IS_ERR(rtc)) {
540 dev_err(&pdev->dev, "cannot attach rtc\n");
541 ret = PTR_ERR(rtc);
542 goto err_nortc;
543 }
544
Heiko Stuebnerd2524ca2011-12-24 10:52:14 +0900545 s3c_rtc_cpu_type = s3c_rtc_get_driver_data(pdev);
Maurus Cuelenaereeaa6e4d2010-06-04 14:14:46 -0700546
Taekgyun Ko051fe542010-07-29 13:00:42 +0900547 /* Check RTC Time */
548
Changhwan Youne1df9622010-10-27 15:33:10 -0700549 s3c_rtc_gettime(NULL, &rtc_tm);
Taekgyun Ko051fe542010-07-29 13:00:42 +0900550
Changhwan Youne1df9622010-10-27 15:33:10 -0700551 if (rtc_valid_tm(&rtc_tm)) {
552 rtc_tm.tm_year = 100;
553 rtc_tm.tm_mon = 0;
554 rtc_tm.tm_mday = 1;
555 rtc_tm.tm_hour = 0;
556 rtc_tm.tm_min = 0;
557 rtc_tm.tm_sec = 0;
558
559 s3c_rtc_settime(NULL, &rtc_tm);
560
561 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
Taekgyun Ko051fe542010-07-29 13:00:42 +0900562 }
563
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900564 if (s3c_rtc_cpu_type != TYPE_S3C2410)
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700565 rtc->max_user_freq = 32768;
566 else
567 rtc->max_user_freq = 128;
568
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900569 if (s3c_rtc_cpu_type == TYPE_S3C2416 || s3c_rtc_cpu_type == TYPE_S3C2443) {
570 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
571 tmp |= S3C2443_RTCCON_TICSEL;
572 writew(tmp, s3c_rtc_base + S3C2410_RTCCON);
573 }
574
Ben Dooks1add6782006-07-01 04:36:26 -0700575 platform_set_drvdata(pdev, rtc);
Maurus Cuelenaeree893de52010-06-04 14:14:44 -0700576
577 s3c_rtc_setfreq(&pdev->dev, 1);
578
MyungJoo Ham62d17602011-08-25 15:59:24 -0700579 ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
Yong Zhang2f6e5f92012-03-23 15:02:34 -0700580 0, "s3c2410-rtc alarm", rtc);
MyungJoo Ham62d17602011-08-25 15:59:24 -0700581 if (ret) {
582 dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
583 goto err_alarm_irq;
584 }
585
586 ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
Yong Zhang2f6e5f92012-03-23 15:02:34 -0700587 0, "s3c2410-rtc tick", rtc);
MyungJoo Ham62d17602011-08-25 15:59:24 -0700588 if (ret) {
589 dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
590 free_irq(s3c_rtc_alarmno, rtc);
591 goto err_tick_irq;
592 }
593
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700594 clk_disable(rtc_clk);
595
Ben Dooks1add6782006-07-01 04:36:26 -0700596 return 0;
597
MyungJoo Ham62d17602011-08-25 15:59:24 -0700598 err_tick_irq:
599 free_irq(s3c_rtc_alarmno, rtc);
600
601 err_alarm_irq:
602 platform_set_drvdata(pdev, NULL);
603 rtc_device_unregister(rtc);
604
Ben Dooks1add6782006-07-01 04:36:26 -0700605 err_nortc:
606 s3c_rtc_enable(pdev, 0);
Atul Dahiyae48add82010-07-20 12:19:14 +0530607 clk_disable(rtc_clk);
608 clk_put(rtc_clk);
609
610 err_clk:
Ben Dooks1add6782006-07-01 04:36:26 -0700611 iounmap(s3c_rtc_base);
612
613 err_nomap:
614 release_resource(s3c_rtc_mem);
615
616 err_nores:
617 return ret;
618}
619
620#ifdef CONFIG_PM
621
622/* RTC Power management control */
623
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700624static int ticnt_save, ticnt_en_save;
Ben Dooks1add6782006-07-01 04:36:26 -0700625
626static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
627{
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700628 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700629 /* save TICNT for anyone using periodic interrupts */
Ben Dooks9a654512006-08-27 01:23:22 -0700630 ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700631 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700632 ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700633 ticnt_en_save &= S3C64XX_RTCCON_TICEN;
634 }
Ben Dooks1add6782006-07-01 04:36:26 -0700635 s3c_rtc_enable(pdev, 0);
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700636
Ben Dooks52cd4e52011-05-11 15:13:28 -0700637 if (device_may_wakeup(&pdev->dev) && !wake_en) {
638 if (enable_irq_wake(s3c_rtc_alarmno) == 0)
639 wake_en = true;
640 else
641 dev_err(&pdev->dev, "enable_irq_wake failed\n");
642 }
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700643 clk_disable(rtc_clk);
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700644
Ben Dooks1add6782006-07-01 04:36:26 -0700645 return 0;
646}
647
648static int s3c_rtc_resume(struct platform_device *pdev)
649{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700650 unsigned int tmp;
651
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700652 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700653 s3c_rtc_enable(pdev, 1);
Ben Dooks9a654512006-08-27 01:23:22 -0700654 writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700655 if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700656 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
657 writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700658 }
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700659
Ben Dooks52cd4e52011-05-11 15:13:28 -0700660 if (device_may_wakeup(&pdev->dev) && wake_en) {
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700661 disable_irq_wake(s3c_rtc_alarmno);
Ben Dooks52cd4e52011-05-11 15:13:28 -0700662 wake_en = false;
663 }
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700664 clk_disable(rtc_clk);
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700665
Ben Dooks1add6782006-07-01 04:36:26 -0700666 return 0;
667}
668#else
669#define s3c_rtc_suspend NULL
670#define s3c_rtc_resume NULL
671#endif
672
Tushar Beherac3cba922012-04-12 12:49:14 -0700673static struct s3c_rtc_drv_data s3c_rtc_drv_data_array[] = {
674 [TYPE_S3C2410] = { TYPE_S3C2410 },
675 [TYPE_S3C2416] = { TYPE_S3C2416 },
676 [TYPE_S3C2443] = { TYPE_S3C2443 },
677 [TYPE_S3C64XX] = { TYPE_S3C64XX },
678};
679
Thomas Abraham39ce4082011-10-24 14:49:04 +0200680#ifdef CONFIG_OF
681static const struct of_device_id s3c_rtc_dt_match[] = {
Heiko Stuebnerd2524ca2011-12-24 10:52:14 +0900682 {
Tushar Beheracd1e6f92012-04-12 12:49:14 -0700683 .compatible = "samsung,s3c2410-rtc",
Tushar Beherac3cba922012-04-12 12:49:14 -0700684 .data = &s3c_rtc_drv_data_array[TYPE_S3C2410],
Heiko Stuebnerd2524ca2011-12-24 10:52:14 +0900685 }, {
Tushar Beheracd1e6f92012-04-12 12:49:14 -0700686 .compatible = "samsung,s3c2416-rtc",
Tushar Beherac3cba922012-04-12 12:49:14 -0700687 .data = &s3c_rtc_drv_data_array[TYPE_S3C2416],
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900688 }, {
Tushar Beheracd1e6f92012-04-12 12:49:14 -0700689 .compatible = "samsung,s3c2443-rtc",
Tushar Beherac3cba922012-04-12 12:49:14 -0700690 .data = &s3c_rtc_drv_data_array[TYPE_S3C2443],
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900691 }, {
Tushar Beheracd1e6f92012-04-12 12:49:14 -0700692 .compatible = "samsung,s3c6410-rtc",
Tushar Beherac3cba922012-04-12 12:49:14 -0700693 .data = &s3c_rtc_drv_data_array[TYPE_S3C64XX],
Heiko Stuebnerd2524ca2011-12-24 10:52:14 +0900694 },
Thomas Abraham39ce4082011-10-24 14:49:04 +0200695 {},
696};
697MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
698#else
699#define s3c_rtc_dt_match NULL
700#endif
701
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700702static struct platform_device_id s3c_rtc_driver_ids[] = {
703 {
704 .name = "s3c2410-rtc",
705 .driver_data = TYPE_S3C2410,
706 }, {
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900707 .name = "s3c2416-rtc",
708 .driver_data = TYPE_S3C2416,
709 }, {
710 .name = "s3c2443-rtc",
711 .driver_data = TYPE_S3C2443,
712 }, {
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700713 .name = "s3c64xx-rtc",
714 .driver_data = TYPE_S3C64XX,
715 },
716 { }
717};
718
719MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
720
721static struct platform_driver s3c_rtc_driver = {
Ben Dooks1add6782006-07-01 04:36:26 -0700722 .probe = s3c_rtc_probe,
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700723 .remove = __devexit_p(s3c_rtc_remove),
Ben Dooks1add6782006-07-01 04:36:26 -0700724 .suspend = s3c_rtc_suspend,
725 .resume = s3c_rtc_resume,
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700726 .id_table = s3c_rtc_driver_ids,
Ben Dooks1add6782006-07-01 04:36:26 -0700727 .driver = {
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700728 .name = "s3c-rtc",
Ben Dooks1add6782006-07-01 04:36:26 -0700729 .owner = THIS_MODULE,
Thomas Abraham39ce4082011-10-24 14:49:04 +0200730 .of_match_table = s3c_rtc_dt_match,
Ben Dooks1add6782006-07-01 04:36:26 -0700731 },
732};
733
Axel Lin0c4eae62012-01-10 15:10:48 -0800734module_platform_driver(s3c_rtc_driver);
Ben Dooks1add6782006-07-01 04:36:26 -0700735
736MODULE_DESCRIPTION("Samsung S3C RTC Driver");
737MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
738MODULE_LICENSE("GPL");
Kay Sieversad28a072008-04-10 21:29:25 -0700739MODULE_ALIAS("platform:s3c2410-rtc");