blob: 4bd9414aee650e2b08449323a5840497a5b9c48c [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>
Thomas Abraham39ce4082011-10-24 14:49:04 +020028#include <linux/of.h>
Sachin Kamatdbd9acb2012-07-30 14:41:48 -070029#include <linux/uaccess.h>
30#include <linux/io.h>
Ben Dooks1add6782006-07-01 04:36:26 -070031
Russell Kinga09e64f2008-08-05 16:14:15 +010032#include <mach/hardware.h>
Ben Dooks1add6782006-07-01 04:36:26 -070033#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
Atul Dahiyae48add82010-07-20 12:19:14 +053050static struct clk *rtc_clk;
Ben Dooks1add6782006-07-01 04:36:26 -070051static void __iomem *s3c_rtc_base;
52static int s3c_rtc_alarmno = NO_IRQ;
53static int s3c_rtc_tickno = NO_IRQ;
Ben Dooks52cd4e52011-05-11 15:13:28 -070054static bool wake_en;
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -070055static enum s3c_cpu_type s3c_rtc_cpu_type;
Ben Dooks1add6782006-07-01 04:36:26 -070056
57static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
Ben Dooks1add6782006-07-01 04:36:26 -070058
Donggeun Kim88cee8f2011-09-14 16:22:19 -070059static void s3c_rtc_alarm_clk_enable(bool enable)
60{
61 static DEFINE_SPINLOCK(s3c_rtc_alarm_clk_lock);
62 static bool alarm_clk_enabled;
63 unsigned long irq_flags;
64
65 spin_lock_irqsave(&s3c_rtc_alarm_clk_lock, irq_flags);
66 if (enable) {
67 if (!alarm_clk_enabled) {
68 clk_enable(rtc_clk);
69 alarm_clk_enabled = true;
70 }
71 } else {
72 if (alarm_clk_enabled) {
73 clk_disable(rtc_clk);
74 alarm_clk_enabled = false;
75 }
76 }
77 spin_unlock_irqrestore(&s3c_rtc_alarm_clk_lock, irq_flags);
78}
79
Ben Dooks1add6782006-07-01 04:36:26 -070080/* IRQ Handlers */
81
David Howells7d12e782006-10-05 14:55:46 +010082static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
Ben Dooks1add6782006-07-01 04:36:26 -070083{
84 struct rtc_device *rdev = id;
85
Donggeun Kimcefe4fb2011-07-25 17:13:32 -070086 clk_enable(rtc_clk);
David Brownellab6a2d72007-05-08 00:33:30 -070087 rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
Atul Dahiya2f3478f2010-07-20 16:02:51 +053088
89 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
90 writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
91
Donggeun Kimcefe4fb2011-07-25 17:13:32 -070092 clk_disable(rtc_clk);
Donggeun Kim88cee8f2011-09-14 16:22:19 -070093
94 s3c_rtc_alarm_clk_enable(false);
95
Ben Dooks1add6782006-07-01 04:36:26 -070096 return IRQ_HANDLED;
97}
98
David Howells7d12e782006-10-05 14:55:46 +010099static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
Ben Dooks1add6782006-07-01 04:36:26 -0700100{
101 struct rtc_device *rdev = id;
102
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700103 clk_enable(rtc_clk);
Ben Dooks773be7e2008-07-23 21:30:45 -0700104 rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
Atul Dahiya2f3478f2010-07-20 16:02:51 +0530105
106 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
107 writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
108
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700109 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700110 return IRQ_HANDLED;
111}
112
113/* Update control registers */
Axel Lin2ec38a02011-03-04 17:36:19 -0800114static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
Ben Dooks1add6782006-07-01 04:36:26 -0700115{
116 unsigned int tmp;
117
Axel Lin2ec38a02011-03-04 17:36:19 -0800118 pr_debug("%s: aie=%d\n", __func__, enabled);
Ben Dooks1add6782006-07-01 04:36:26 -0700119
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700120 clk_enable(rtc_clk);
Ben Dooks9a654512006-08-27 01:23:22 -0700121 tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
Ben Dooks1add6782006-07-01 04:36:26 -0700122
Axel Lin2ec38a02011-03-04 17:36:19 -0800123 if (enabled)
Ben Dooks1add6782006-07-01 04:36:26 -0700124 tmp |= S3C2410_RTCALM_ALMEN;
125
Ben Dooks9a654512006-08-27 01:23:22 -0700126 writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700127 clk_disable(rtc_clk);
Axel Lin2ec38a02011-03-04 17:36:19 -0800128
Donggeun Kim88cee8f2011-09-14 16:22:19 -0700129 s3c_rtc_alarm_clk_enable(enabled);
130
Axel Lin2ec38a02011-03-04 17:36:19 -0800131 return 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700132}
133
Ben Dooks773be7e2008-07-23 21:30:45 -0700134static int s3c_rtc_setfreq(struct device *dev, int freq)
Ben Dooks1add6782006-07-01 04:36:26 -0700135{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700136 struct platform_device *pdev = to_platform_device(dev);
137 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
138 unsigned int tmp = 0;
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900139 int val;
Ben Dooks1add6782006-07-01 04:36:26 -0700140
Jonathan Cameron5d2a5032009-01-06 14:42:12 -0800141 if (!is_power_of_2(freq))
142 return -EINVAL;
143
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700144 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700145 spin_lock_irq(&s3c_rtc_pie_lock);
Ben Dooks773be7e2008-07-23 21:30:45 -0700146
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900147 if (s3c_rtc_cpu_type != TYPE_S3C64XX) {
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700148 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
149 tmp &= S3C2410_TICNT_ENABLE;
150 }
151
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900152 val = (rtc_dev->max_user_freq / freq) - 1;
153
154 if (s3c_rtc_cpu_type == TYPE_S3C2416 || s3c_rtc_cpu_type == TYPE_S3C2443) {
155 tmp |= S3C2443_TICNT_PART(val);
156 writel(S3C2443_TICNT1_PART(val), s3c_rtc_base + S3C2443_TICNT1);
157
158 if (s3c_rtc_cpu_type == TYPE_S3C2416)
159 writel(S3C2416_TICNT2_PART(val), s3c_rtc_base + S3C2416_TICNT2);
160 } else {
161 tmp |= val;
162 }
Ben Dooks1add6782006-07-01 04:36:26 -0700163
Atul Dahiya2f3478f2010-07-20 16:02:51 +0530164 writel(tmp, s3c_rtc_base + S3C2410_TICNT);
Ben Dooks1add6782006-07-01 04:36:26 -0700165 spin_unlock_irq(&s3c_rtc_pie_lock);
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700166 clk_disable(rtc_clk);
Ben Dooks773be7e2008-07-23 21:30:45 -0700167
168 return 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700169}
170
171/* Time read/write */
172
173static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
174{
175 unsigned int have_retried = 0;
Ben Dooks9a654512006-08-27 01:23:22 -0700176 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700177
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700178 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700179 retry_get_time:
Ben Dooks9a654512006-08-27 01:23:22 -0700180 rtc_tm->tm_min = readb(base + S3C2410_RTCMIN);
181 rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
182 rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
183 rtc_tm->tm_mon = readb(base + S3C2410_RTCMON);
184 rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
185 rtc_tm->tm_sec = readb(base + S3C2410_RTCSEC);
Ben Dooks1add6782006-07-01 04:36:26 -0700186
Adam Buchbinder48fc7f72012-09-19 21:48:00 -0400187 /* the only way to work out whether the system was mid-update
Ben Dooks1add6782006-07-01 04:36:26 -0700188 * when we read it is to check the second counter, and if it
189 * is zero, then we re-try the entire read
190 */
191
192 if (rtc_tm->tm_sec == 0 && !have_retried) {
193 have_retried = 1;
194 goto retry_get_time;
195 }
196
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700197 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
198 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
199 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
200 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
201 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
202 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
Ben Dooks1add6782006-07-01 04:36:26 -0700203
204 rtc_tm->tm_year += 100;
MyungJoo Ham4e8896c2011-08-25 15:59:22 -0700205
206 pr_debug("read time %04d.%02d.%02d %02d:%02d:%02d\n",
207 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
208 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
209
Ben Dooks1add6782006-07-01 04:36:26 -0700210 rtc_tm->tm_mon -= 1;
211
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700212 clk_disable(rtc_clk);
Kukjin Kim5b3ffdd2010-10-27 15:33:11 -0700213 return rtc_valid_tm(rtc_tm);
Ben Dooks1add6782006-07-01 04:36:26 -0700214}
215
216static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
217{
Ben Dooks9a654512006-08-27 01:23:22 -0700218 void __iomem *base = s3c_rtc_base;
Ben Dooks641741e2006-08-27 01:23:27 -0700219 int year = tm->tm_year - 100;
Ben Dooks1add6782006-07-01 04:36:26 -0700220
Kukjin Kim30ffc402010-10-27 15:33:09 -0700221 pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
222 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
Ben Dooks9a654512006-08-27 01:23:22 -0700223 tm->tm_hour, tm->tm_min, tm->tm_sec);
224
Ben Dooks641741e2006-08-27 01:23:27 -0700225 /* we get around y2k by simply not supporting it */
226
227 if (year < 0 || year >= 100) {
228 dev_err(dev, "rtc only supports 100 years\n");
229 return -EINVAL;
230 }
231
Jonghwan Choi2dbcd052011-12-08 14:34:02 -0800232 clk_enable(rtc_clk);
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700233 writeb(bin2bcd(tm->tm_sec), base + S3C2410_RTCSEC);
234 writeb(bin2bcd(tm->tm_min), base + S3C2410_RTCMIN);
235 writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
236 writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
237 writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
238 writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700239 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700240
241 return 0;
242}
243
244static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
245{
246 struct rtc_time *alm_tm = &alrm->time;
Ben Dooks9a654512006-08-27 01:23:22 -0700247 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700248 unsigned int alm_en;
249
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700250 clk_enable(rtc_clk);
Ben Dooks9a654512006-08-27 01:23:22 -0700251 alm_tm->tm_sec = readb(base + S3C2410_ALMSEC);
252 alm_tm->tm_min = readb(base + S3C2410_ALMMIN);
253 alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
254 alm_tm->tm_mon = readb(base + S3C2410_ALMMON);
255 alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
256 alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
Ben Dooks1add6782006-07-01 04:36:26 -0700257
Ben Dooks9a654512006-08-27 01:23:22 -0700258 alm_en = readb(base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700259
David Brownella2db8df2006-12-13 00:35:08 -0800260 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
261
Kukjin Kim30ffc402010-10-27 15:33:09 -0700262 pr_debug("read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
Ben Dooks1add6782006-07-01 04:36:26 -0700263 alm_en,
Kukjin Kim30ffc402010-10-27 15:33:09 -0700264 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
Ben Dooks1add6782006-07-01 04:36:26 -0700265 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
266
267
268 /* decode the alarm enable field */
269
270 if (alm_en & S3C2410_RTCALM_SECEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700271 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
Ben Dooks1add6782006-07-01 04:36:26 -0700272 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700273 alm_tm->tm_sec = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700274
275 if (alm_en & S3C2410_RTCALM_MINEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700276 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
Ben Dooks1add6782006-07-01 04:36:26 -0700277 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700278 alm_tm->tm_min = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700279
280 if (alm_en & S3C2410_RTCALM_HOUREN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700281 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
Ben Dooks1add6782006-07-01 04:36:26 -0700282 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700283 alm_tm->tm_hour = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700284
285 if (alm_en & S3C2410_RTCALM_DAYEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700286 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
Ben Dooks1add6782006-07-01 04:36:26 -0700287 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700288 alm_tm->tm_mday = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700289
290 if (alm_en & S3C2410_RTCALM_MONEN) {
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700291 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
Ben Dooks1add6782006-07-01 04:36:26 -0700292 alm_tm->tm_mon -= 1;
293 } else {
Changhwan Youndd061d12010-10-27 15:33:08 -0700294 alm_tm->tm_mon = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700295 }
296
297 if (alm_en & S3C2410_RTCALM_YEAREN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700298 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
Ben Dooks1add6782006-07-01 04:36:26 -0700299 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700300 alm_tm->tm_year = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700301
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700302 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700303 return 0;
304}
305
306static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
307{
308 struct rtc_time *tm = &alrm->time;
Ben Dooks9a654512006-08-27 01:23:22 -0700309 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700310 unsigned int alrm_en;
311
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700312 clk_enable(rtc_clk);
Kukjin Kim30ffc402010-10-27 15:33:09 -0700313 pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
Ben Dooks1add6782006-07-01 04:36:26 -0700314 alrm->enabled,
MyungJoo Ham4e8896c2011-08-25 15:59:22 -0700315 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
Kukjin Kim30ffc402010-10-27 15:33:09 -0700316 tm->tm_hour, tm->tm_min, tm->tm_sec);
Ben Dooks1add6782006-07-01 04:36:26 -0700317
Ben Dooks9a654512006-08-27 01:23:22 -0700318 alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
319 writeb(0x00, base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700320
321 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
322 alrm_en |= S3C2410_RTCALM_SECEN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700323 writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
Ben Dooks1add6782006-07-01 04:36:26 -0700324 }
325
326 if (tm->tm_min < 60 && tm->tm_min >= 0) {
327 alrm_en |= S3C2410_RTCALM_MINEN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700328 writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
Ben Dooks1add6782006-07-01 04:36:26 -0700329 }
330
331 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
332 alrm_en |= S3C2410_RTCALM_HOUREN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700333 writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
Ben Dooks1add6782006-07-01 04:36:26 -0700334 }
335
336 pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
337
Ben Dooks9a654512006-08-27 01:23:22 -0700338 writeb(alrm_en, base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700339
Axel Lin2ec38a02011-03-04 17:36:19 -0800340 s3c_rtc_setaie(dev, alrm->enabled);
Ben Dooks1add6782006-07-01 04:36:26 -0700341
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700342 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700343 return 0;
344}
345
Ben Dooks1add6782006-07-01 04:36:26 -0700346static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
347{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700348 unsigned int ticnt;
Ben Dooks1add6782006-07-01 04:36:26 -0700349
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700350 clk_enable(rtc_clk);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700351 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700352 ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700353 ticnt &= S3C64XX_RTCCON_TICEN;
354 } else {
355 ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
356 ticnt &= S3C2410_TICNT_ENABLE;
357 }
358
359 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700360 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700361 return 0;
362}
363
David Brownellff8371a2006-09-30 23:28:17 -0700364static const struct rtc_class_ops s3c_rtcops = {
Ben Dooks1add6782006-07-01 04:36:26 -0700365 .read_time = s3c_rtc_gettime,
366 .set_time = s3c_rtc_settime,
367 .read_alarm = s3c_rtc_getalarm,
368 .set_alarm = s3c_rtc_setalarm,
Changhwan Youne6eb5242010-10-27 15:33:09 -0700369 .proc = s3c_rtc_proc,
370 .alarm_irq_enable = s3c_rtc_setaie,
Ben Dooks1add6782006-07-01 04:36:26 -0700371};
372
373static void s3c_rtc_enable(struct platform_device *pdev, int en)
374{
Ben Dooks9a654512006-08-27 01:23:22 -0700375 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700376 unsigned int tmp;
377
378 if (s3c_rtc_base == NULL)
379 return;
380
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700381 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700382 if (!en) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700383 tmp = readw(base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700384 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
385 tmp &= ~S3C64XX_RTCCON_TICEN;
386 tmp &= ~S3C2410_RTCCON_RTCEN;
Changhwan Younf61ae672010-10-27 15:33:06 -0700387 writew(tmp, base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700388
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900389 if (s3c_rtc_cpu_type != TYPE_S3C64XX) {
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700390 tmp = readb(base + S3C2410_TICNT);
391 tmp &= ~S3C2410_TICNT_ENABLE;
392 writeb(tmp, base + S3C2410_TICNT);
393 }
Ben Dooks1add6782006-07-01 04:36:26 -0700394 } else {
395 /* re-enable the device, and check it is ok */
396
Changhwan Younf61ae672010-10-27 15:33:06 -0700397 if ((readw(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
Ben Dooks1add6782006-07-01 04:36:26 -0700398 dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
399
Changhwan Younf61ae672010-10-27 15:33:06 -0700400 tmp = readw(base + S3C2410_RTCCON);
401 writew(tmp | S3C2410_RTCCON_RTCEN,
402 base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700403 }
404
Changhwan Younf61ae672010-10-27 15:33:06 -0700405 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {
Ben Dooks1add6782006-07-01 04:36:26 -0700406 dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
407
Changhwan Younf61ae672010-10-27 15:33:06 -0700408 tmp = readw(base + S3C2410_RTCCON);
409 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
410 base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700411 }
412
Changhwan Younf61ae672010-10-27 15:33:06 -0700413 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {
Ben Dooks1add6782006-07-01 04:36:26 -0700414 dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
415
Changhwan Younf61ae672010-10-27 15:33:06 -0700416 tmp = readw(base + S3C2410_RTCCON);
417 writew(tmp & ~S3C2410_RTCCON_CLKRST,
418 base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700419 }
420 }
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700421 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700422}
423
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700424static int __devexit s3c_rtc_remove(struct platform_device *dev)
Ben Dooks1add6782006-07-01 04:36:26 -0700425{
426 struct rtc_device *rtc = platform_get_drvdata(dev);
427
428 platform_set_drvdata(dev, NULL);
429 rtc_device_unregister(rtc);
430
Axel Lin2ec38a02011-03-04 17:36:19 -0800431 s3c_rtc_setaie(&dev->dev, 0);
Ben Dooks1add6782006-07-01 04:36:26 -0700432
Atul Dahiyae48add82010-07-20 12:19:14 +0530433 rtc_clk = NULL;
434
Ben Dooks1add6782006-07-01 04:36:26 -0700435 return 0;
436}
437
Heiko Stuebnerd2524ca2011-12-24 10:52:14 +0900438static const struct of_device_id s3c_rtc_dt_match[];
439
440static inline int s3c_rtc_get_driver_data(struct platform_device *pdev)
441{
442#ifdef CONFIG_OF
Tushar Beherac3cba922012-04-12 12:49:14 -0700443 struct s3c_rtc_drv_data *data;
Heiko Stuebnerd2524ca2011-12-24 10:52:14 +0900444 if (pdev->dev.of_node) {
445 const struct of_device_id *match;
446 match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
Tushar Beherac3cba922012-04-12 12:49:14 -0700447 data = (struct s3c_rtc_drv_data *) match->data;
448 return data->cpu_type;
Heiko Stuebnerd2524ca2011-12-24 10:52:14 +0900449 }
450#endif
451 return platform_get_device_id(pdev)->driver_data;
452}
453
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700454static int __devinit s3c_rtc_probe(struct platform_device *pdev)
Ben Dooks1add6782006-07-01 04:36:26 -0700455{
456 struct rtc_device *rtc;
Changhwan Youne1df9622010-10-27 15:33:10 -0700457 struct rtc_time rtc_tm;
Ben Dooks1add6782006-07-01 04:36:26 -0700458 struct resource *res;
459 int ret;
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900460 int tmp;
Ben Dooks1add6782006-07-01 04:36:26 -0700461
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700462 pr_debug("%s: probe=%p\n", __func__, pdev);
Ben Dooks1add6782006-07-01 04:36:26 -0700463
464 /* find the IRQs */
465
466 s3c_rtc_tickno = platform_get_irq(pdev, 1);
467 if (s3c_rtc_tickno < 0) {
468 dev_err(&pdev->dev, "no irq for rtc tick\n");
Sachin Kamat1ee8c0c2012-10-04 17:14:14 -0700469 return s3c_rtc_tickno;
Ben Dooks1add6782006-07-01 04:36:26 -0700470 }
471
472 s3c_rtc_alarmno = platform_get_irq(pdev, 0);
473 if (s3c_rtc_alarmno < 0) {
474 dev_err(&pdev->dev, "no irq for alarm\n");
Sachin Kamat1ee8c0c2012-10-04 17:14:14 -0700475 return s3c_rtc_alarmno;
Ben Dooks1add6782006-07-01 04:36:26 -0700476 }
477
478 pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
479 s3c_rtc_tickno, s3c_rtc_alarmno);
480
481 /* get the memory region */
482
483 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
484 if (res == NULL) {
485 dev_err(&pdev->dev, "failed to get memory region resource\n");
486 return -ENOENT;
487 }
488
Tushar Behera1b997322012-12-17 16:02:48 -0800489 s3c_rtc_base = devm_request_and_ioremap(&pdev->dev, res);
Ben Dooks1add6782006-07-01 04:36:26 -0700490 if (s3c_rtc_base == NULL) {
Tushar Behera1b997322012-12-17 16:02:48 -0800491 dev_err(&pdev->dev, "failed to ioremap memory region\n");
492 return -EINVAL;
Ben Dooks1add6782006-07-01 04:36:26 -0700493 }
494
Tushar Behera1b997322012-12-17 16:02:48 -0800495 rtc_clk = devm_clk_get(&pdev->dev, "rtc");
Atul Dahiyae48add82010-07-20 12:19:14 +0530496 if (IS_ERR(rtc_clk)) {
497 dev_err(&pdev->dev, "failed to find rtc clock source\n");
498 ret = PTR_ERR(rtc_clk);
499 rtc_clk = NULL;
Tushar Behera1b997322012-12-17 16:02:48 -0800500 return ret;
Atul Dahiyae48add82010-07-20 12:19:14 +0530501 }
502
503 clk_enable(rtc_clk);
504
Ben Dooks1add6782006-07-01 04:36:26 -0700505 /* check to see if everything is setup correctly */
506
507 s3c_rtc_enable(pdev, 1);
508
Changhwan Younf61ae672010-10-27 15:33:06 -0700509 pr_debug("s3c2410_rtc: RTCCON=%02x\n",
510 readw(s3c_rtc_base + S3C2410_RTCCON));
Ben Dooks1add6782006-07-01 04:36:26 -0700511
Yauhen Kharuzhy51b76162008-10-29 14:01:16 -0700512 device_init_wakeup(&pdev->dev, 1);
513
Ben Dooks1add6782006-07-01 04:36:26 -0700514 /* register RTC and exit */
515
516 rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
517 THIS_MODULE);
518
519 if (IS_ERR(rtc)) {
520 dev_err(&pdev->dev, "cannot attach rtc\n");
521 ret = PTR_ERR(rtc);
522 goto err_nortc;
523 }
524
Heiko Stuebnerd2524ca2011-12-24 10:52:14 +0900525 s3c_rtc_cpu_type = s3c_rtc_get_driver_data(pdev);
Maurus Cuelenaereeaa6e4d2010-06-04 14:14:46 -0700526
Taekgyun Ko051fe542010-07-29 13:00:42 +0900527 /* Check RTC Time */
528
Changhwan Youne1df9622010-10-27 15:33:10 -0700529 s3c_rtc_gettime(NULL, &rtc_tm);
Taekgyun Ko051fe542010-07-29 13:00:42 +0900530
Changhwan Youne1df9622010-10-27 15:33:10 -0700531 if (rtc_valid_tm(&rtc_tm)) {
532 rtc_tm.tm_year = 100;
533 rtc_tm.tm_mon = 0;
534 rtc_tm.tm_mday = 1;
535 rtc_tm.tm_hour = 0;
536 rtc_tm.tm_min = 0;
537 rtc_tm.tm_sec = 0;
538
539 s3c_rtc_settime(NULL, &rtc_tm);
540
541 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
Taekgyun Ko051fe542010-07-29 13:00:42 +0900542 }
543
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900544 if (s3c_rtc_cpu_type != TYPE_S3C2410)
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700545 rtc->max_user_freq = 32768;
546 else
547 rtc->max_user_freq = 128;
548
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900549 if (s3c_rtc_cpu_type == TYPE_S3C2416 || s3c_rtc_cpu_type == TYPE_S3C2443) {
550 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
551 tmp |= S3C2443_RTCCON_TICSEL;
552 writew(tmp, s3c_rtc_base + S3C2410_RTCCON);
553 }
554
Ben Dooks1add6782006-07-01 04:36:26 -0700555 platform_set_drvdata(pdev, rtc);
Maurus Cuelenaeree893de52010-06-04 14:14:44 -0700556
557 s3c_rtc_setfreq(&pdev->dev, 1);
558
Tushar Behera1b997322012-12-17 16:02:48 -0800559 ret = devm_request_irq(&pdev->dev, s3c_rtc_alarmno, s3c_rtc_alarmirq,
Yong Zhang2f6e5f92012-03-23 15:02:34 -0700560 0, "s3c2410-rtc alarm", rtc);
MyungJoo Ham62d17602011-08-25 15:59:24 -0700561 if (ret) {
562 dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
563 goto err_alarm_irq;
564 }
565
Tushar Behera1b997322012-12-17 16:02:48 -0800566 ret = devm_request_irq(&pdev->dev, s3c_rtc_tickno, s3c_rtc_tickirq,
Yong Zhang2f6e5f92012-03-23 15:02:34 -0700567 0, "s3c2410-rtc tick", rtc);
MyungJoo Ham62d17602011-08-25 15:59:24 -0700568 if (ret) {
569 dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
Tushar Behera1b997322012-12-17 16:02:48 -0800570 goto err_alarm_irq;
MyungJoo Ham62d17602011-08-25 15:59:24 -0700571 }
572
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700573 clk_disable(rtc_clk);
574
Ben Dooks1add6782006-07-01 04:36:26 -0700575 return 0;
576
MyungJoo Ham62d17602011-08-25 15:59:24 -0700577 err_alarm_irq:
578 platform_set_drvdata(pdev, NULL);
579 rtc_device_unregister(rtc);
580
Ben Dooks1add6782006-07-01 04:36:26 -0700581 err_nortc:
582 s3c_rtc_enable(pdev, 0);
Atul Dahiyae48add82010-07-20 12:19:14 +0530583 clk_disable(rtc_clk);
Atul Dahiyae48add82010-07-20 12:19:14 +0530584
Ben Dooks1add6782006-07-01 04:36:26 -0700585 return ret;
586}
587
588#ifdef CONFIG_PM
589
590/* RTC Power management control */
591
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700592static int ticnt_save, ticnt_en_save;
Ben Dooks1add6782006-07-01 04:36:26 -0700593
594static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
595{
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700596 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700597 /* save TICNT for anyone using periodic interrupts */
Ben Dooks9a654512006-08-27 01:23:22 -0700598 ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700599 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700600 ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700601 ticnt_en_save &= S3C64XX_RTCCON_TICEN;
602 }
Ben Dooks1add6782006-07-01 04:36:26 -0700603 s3c_rtc_enable(pdev, 0);
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700604
Ben Dooks52cd4e52011-05-11 15:13:28 -0700605 if (device_may_wakeup(&pdev->dev) && !wake_en) {
606 if (enable_irq_wake(s3c_rtc_alarmno) == 0)
607 wake_en = true;
608 else
609 dev_err(&pdev->dev, "enable_irq_wake failed\n");
610 }
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700611 clk_disable(rtc_clk);
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700612
Ben Dooks1add6782006-07-01 04:36:26 -0700613 return 0;
614}
615
616static int s3c_rtc_resume(struct platform_device *pdev)
617{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700618 unsigned int tmp;
619
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700620 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700621 s3c_rtc_enable(pdev, 1);
Ben Dooks9a654512006-08-27 01:23:22 -0700622 writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700623 if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700624 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
625 writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700626 }
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700627
Ben Dooks52cd4e52011-05-11 15:13:28 -0700628 if (device_may_wakeup(&pdev->dev) && wake_en) {
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700629 disable_irq_wake(s3c_rtc_alarmno);
Ben Dooks52cd4e52011-05-11 15:13:28 -0700630 wake_en = false;
631 }
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700632 clk_disable(rtc_clk);
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700633
Ben Dooks1add6782006-07-01 04:36:26 -0700634 return 0;
635}
636#else
637#define s3c_rtc_suspend NULL
638#define s3c_rtc_resume NULL
639#endif
640
Sachin Kamatecb41a72012-05-29 15:07:40 -0700641#ifdef CONFIG_OF
Tushar Beherac3cba922012-04-12 12:49:14 -0700642static struct s3c_rtc_drv_data s3c_rtc_drv_data_array[] = {
643 [TYPE_S3C2410] = { TYPE_S3C2410 },
644 [TYPE_S3C2416] = { TYPE_S3C2416 },
645 [TYPE_S3C2443] = { TYPE_S3C2443 },
646 [TYPE_S3C64XX] = { TYPE_S3C64XX },
647};
648
Thomas Abraham39ce4082011-10-24 14:49:04 +0200649static const struct of_device_id s3c_rtc_dt_match[] = {
Heiko Stuebnerd2524ca2011-12-24 10:52:14 +0900650 {
Tushar Beheracd1e6f92012-04-12 12:49:14 -0700651 .compatible = "samsung,s3c2410-rtc",
Tushar Beherac3cba922012-04-12 12:49:14 -0700652 .data = &s3c_rtc_drv_data_array[TYPE_S3C2410],
Heiko Stuebnerd2524ca2011-12-24 10:52:14 +0900653 }, {
Tushar Beheracd1e6f92012-04-12 12:49:14 -0700654 .compatible = "samsung,s3c2416-rtc",
Tushar Beherac3cba922012-04-12 12:49:14 -0700655 .data = &s3c_rtc_drv_data_array[TYPE_S3C2416],
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900656 }, {
Tushar Beheracd1e6f92012-04-12 12:49:14 -0700657 .compatible = "samsung,s3c2443-rtc",
Tushar Beherac3cba922012-04-12 12:49:14 -0700658 .data = &s3c_rtc_drv_data_array[TYPE_S3C2443],
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900659 }, {
Tushar Beheracd1e6f92012-04-12 12:49:14 -0700660 .compatible = "samsung,s3c6410-rtc",
Tushar Beherac3cba922012-04-12 12:49:14 -0700661 .data = &s3c_rtc_drv_data_array[TYPE_S3C64XX],
Heiko Stuebnerd2524ca2011-12-24 10:52:14 +0900662 },
Thomas Abraham39ce4082011-10-24 14:49:04 +0200663 {},
664};
665MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
Thomas Abraham39ce4082011-10-24 14:49:04 +0200666#endif
667
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700668static struct platform_device_id s3c_rtc_driver_ids[] = {
669 {
670 .name = "s3c2410-rtc",
671 .driver_data = TYPE_S3C2410,
672 }, {
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900673 .name = "s3c2416-rtc",
674 .driver_data = TYPE_S3C2416,
675 }, {
676 .name = "s3c2443-rtc",
677 .driver_data = TYPE_S3C2443,
678 }, {
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700679 .name = "s3c64xx-rtc",
680 .driver_data = TYPE_S3C64XX,
681 },
682 { }
683};
684
685MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
686
687static struct platform_driver s3c_rtc_driver = {
Ben Dooks1add6782006-07-01 04:36:26 -0700688 .probe = s3c_rtc_probe,
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700689 .remove = __devexit_p(s3c_rtc_remove),
Ben Dooks1add6782006-07-01 04:36:26 -0700690 .suspend = s3c_rtc_suspend,
691 .resume = s3c_rtc_resume,
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700692 .id_table = s3c_rtc_driver_ids,
Ben Dooks1add6782006-07-01 04:36:26 -0700693 .driver = {
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700694 .name = "s3c-rtc",
Ben Dooks1add6782006-07-01 04:36:26 -0700695 .owner = THIS_MODULE,
Sachin Kamat04a373f2012-12-17 16:02:52 -0800696 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
Ben Dooks1add6782006-07-01 04:36:26 -0700697 },
698};
699
Axel Lin0c4eae62012-01-10 15:10:48 -0800700module_platform_driver(s3c_rtc_driver);
Ben Dooks1add6782006-07-01 04:36:26 -0700701
702MODULE_DESCRIPTION("Samsung S3C RTC Driver");
703MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
704MODULE_LICENSE("GPL");
Kay Sieversad28a072008-04-10 21:29:25 -0700705MODULE_ALIAS("platform:s3c2410-rtc");