blob: 74bf6473a05d3eec357e429f6e06d88e96cdac24 [file] [log] [blame]
Thomas Gleixnerd2912cb2019-06-04 10:11:33 +02001// SPDX-License-Identifier: GPL-2.0-only
Ben Dooks1add6782006-07-01 04:36:26 -07002/* drivers/rtc/rtc-s3c.c
3 *
Atul Dahiyae48add82010-07-20 12:19:14 +05304 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
Ben Dooks1add6782006-07-01 04:36:26 -07007 * Copyright (c) 2004,2006 Simtec Electronics
8 * Ben Dooks, <ben@simtec.co.uk>
9 * http://armlinux.simtec.co.uk/
10 *
Ben Dooks1add6782006-07-01 04:36:26 -070011 * S3C2410/S3C2440/S3C24XX Internal RTC Driver
12*/
13
14#include <linux/module.h>
15#include <linux/fs.h>
16#include <linux/string.h>
17#include <linux/init.h>
18#include <linux/platform_device.h>
19#include <linux/interrupt.h>
20#include <linux/rtc.h>
21#include <linux/bcd.h>
22#include <linux/clk.h>
Robert P. J. Day9974b6e2008-02-06 01:38:42 -080023#include <linux/log2.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090024#include <linux/slab.h>
Thomas Abraham39ce4082011-10-24 14:49:04 +020025#include <linux/of.h>
Marek Szyprowski64704c92019-01-18 14:28:37 +010026#include <linux/of_device.h>
Sachin Kamatdbd9acb2012-07-30 14:41:48 -070027#include <linux/uaccess.h>
28#include <linux/io.h>
Ben Dooks1add6782006-07-01 04:36:26 -070029
Ben Dooks1add6782006-07-01 04:36:26 -070030#include <asm/irq.h>
Arnd Bergmannb9d7c5d2013-03-05 12:04:37 +010031#include "rtc-s3c.h"
Ben Dooks1add6782006-07-01 04:36:26 -070032
Chanwoo Choi19be09f2014-10-13 15:52:28 -070033struct s3c_rtc {
34 struct device *dev;
35 struct rtc_device *rtc;
Ben Dooks1add6782006-07-01 04:36:26 -070036
Chanwoo Choi19be09f2014-10-13 15:52:28 -070037 void __iomem *base;
38 struct clk *rtc_clk;
Chanwoo Choidf9e26d2014-10-13 15:52:35 -070039 struct clk *rtc_src_clk;
Marek Szyprowski5a5b6142019-01-21 12:09:30 +010040 bool alarm_enabled;
Ben Dooks1add6782006-07-01 04:36:26 -070041
Krzysztof Kozlowski6b720862017-06-16 21:28:05 +020042 const struct s3c_rtc_data *data;
Ben Dooks1add6782006-07-01 04:36:26 -070043
Chanwoo Choi19be09f2014-10-13 15:52:28 -070044 int irq_alarm;
45 int irq_tick;
46
47 spinlock_t pie_lock;
Marek Szyprowski5a5b6142019-01-21 12:09:30 +010048 spinlock_t alarm_lock;
Chanwoo Choi19be09f2014-10-13 15:52:28 -070049
Krzysztof Kozlowskifc1afe62017-06-16 21:28:03 +020050 int ticnt_save;
51 int ticnt_en_save;
Chanwoo Choi19be09f2014-10-13 15:52:28 -070052 bool wake_en;
53};
54
Chanwoo Choiae05c952014-10-13 15:52:33 -070055struct s3c_rtc_data {
56 int max_user_freq;
Chanwoo Choidf9e26d2014-10-13 15:52:35 -070057 bool needs_src_clk;
Chanwoo Choiae05c952014-10-13 15:52:33 -070058
59 void (*irq_handler) (struct s3c_rtc *info, int mask);
60 void (*set_freq) (struct s3c_rtc *info, int freq);
61 void (*enable_tick) (struct s3c_rtc *info, struct seq_file *seq);
62 void (*select_tick_clk) (struct s3c_rtc *info);
63 void (*save_tick_cnt) (struct s3c_rtc *info);
64 void (*restore_tick_cnt) (struct s3c_rtc *info);
65 void (*enable) (struct s3c_rtc *info);
66 void (*disable) (struct s3c_rtc *info);
67};
68
Krzysztof Kozlowski498bcf32017-06-16 21:28:07 +020069static int s3c_rtc_enable_clk(struct s3c_rtc *info)
Donggeun Kim88cee8f2011-09-14 16:22:19 -070070{
Marek Szyprowski5a5b6142019-01-21 12:09:30 +010071 int ret;
Donggeun Kim88cee8f2011-09-14 16:22:19 -070072
Marek Szyprowski5a5b6142019-01-21 12:09:30 +010073 ret = clk_enable(info->rtc_clk);
74 if (ret)
75 return ret;
Krzysztof Kozlowski498bcf32017-06-16 21:28:07 +020076
Marek Szyprowski5a5b6142019-01-21 12:09:30 +010077 if (info->data->needs_src_clk) {
78 ret = clk_enable(info->rtc_src_clk);
79 if (ret) {
80 clk_disable(info->rtc_clk);
81 return ret;
Krzysztof Kozlowski498bcf32017-06-16 21:28:07 +020082 }
Joonyoung Shim1fb1c352015-08-12 19:21:46 +090083 }
Marek Szyprowski5a5b6142019-01-21 12:09:30 +010084 return 0;
Chanwoo Choi24e14552015-04-16 12:45:15 -070085}
86
87static void s3c_rtc_disable_clk(struct s3c_rtc *info)
88{
Marek Szyprowski5a5b6142019-01-21 12:09:30 +010089 if (info->data->needs_src_clk)
90 clk_disable(info->rtc_src_clk);
91 clk_disable(info->rtc_clk);
Donggeun Kim88cee8f2011-09-14 16:22:19 -070092}
93
Ben Dooks1add6782006-07-01 04:36:26 -070094/* IRQ Handlers */
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{
Chanwoo Choi19be09f2014-10-13 15:52:28 -070097 struct s3c_rtc *info = (struct s3c_rtc *)id;
Ben Dooks1add6782006-07-01 04:36:26 -070098
Chanwoo Choiae05c952014-10-13 15:52:33 -070099 if (info->data->irq_handler)
100 info->data->irq_handler(info, S3C2410_INTP_TIC);
Atul Dahiya2f3478f2010-07-20 16:02:51 +0530101
Chanwoo Choiae05c952014-10-13 15:52:33 -0700102 return IRQ_HANDLED;
103}
Atul Dahiya2f3478f2010-07-20 16:02:51 +0530104
Chanwoo Choiae05c952014-10-13 15:52:33 -0700105static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
106{
107 struct s3c_rtc *info = (struct s3c_rtc *)id;
108
109 if (info->data->irq_handler)
110 info->data->irq_handler(info, S3C2410_INTP_ALM);
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700111
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{
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700118 struct s3c_rtc *info = dev_get_drvdata(dev);
Marek Szyprowski5a5b6142019-01-21 12:09:30 +0100119 unsigned long flags;
Ben Dooks1add6782006-07-01 04:36:26 -0700120 unsigned int tmp;
Krzysztof Kozlowski498bcf32017-06-16 21:28:07 +0200121 int ret;
Ben Dooks1add6782006-07-01 04:36:26 -0700122
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700123 dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
Ben Dooks1add6782006-07-01 04:36:26 -0700124
Krzysztof Kozlowski498bcf32017-06-16 21:28:07 +0200125 ret = s3c_rtc_enable_clk(info);
126 if (ret)
127 return ret;
Chanwoo Choi24e14552015-04-16 12:45:15 -0700128
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700129 tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
Ben Dooks1add6782006-07-01 04:36:26 -0700130
Axel Lin2ec38a02011-03-04 17:36:19 -0800131 if (enabled)
Ben Dooks1add6782006-07-01 04:36:26 -0700132 tmp |= S3C2410_RTCALM_ALMEN;
133
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700134 writeb(tmp, info->base + S3C2410_RTCALM);
Axel Lin2ec38a02011-03-04 17:36:19 -0800135
Marek Szyprowski5a5b6142019-01-21 12:09:30 +0100136 spin_lock_irqsave(&info->alarm_lock, flags);
137
138 if (info->alarm_enabled && !enabled)
139 s3c_rtc_disable_clk(info);
140 else if (!info->alarm_enabled && enabled)
141 ret = s3c_rtc_enable_clk(info);
142
143 info->alarm_enabled = enabled;
144 spin_unlock_irqrestore(&info->alarm_lock, flags);
145
Chanwoo Choi24e14552015-04-16 12:45:15 -0700146 s3c_rtc_disable_clk(info);
Donggeun Kim88cee8f2011-09-14 16:22:19 -0700147
Marek Szyprowski5a5b6142019-01-21 12:09:30 +0100148 return ret;
Ben Dooks1add6782006-07-01 04:36:26 -0700149}
150
Chanwoo Choiae05c952014-10-13 15:52:33 -0700151/* Set RTC frequency */
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700152static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
Ben Dooks1add6782006-07-01 04:36:26 -0700153{
Krzysztof Kozlowski498bcf32017-06-16 21:28:07 +0200154 int ret;
155
Jonathan Cameron5d2a5032009-01-06 14:42:12 -0800156 if (!is_power_of_2(freq))
157 return -EINVAL;
158
Krzysztof Kozlowski498bcf32017-06-16 21:28:07 +0200159 ret = s3c_rtc_enable_clk(info);
160 if (ret)
161 return ret;
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700162 spin_lock_irq(&info->pie_lock);
Ben Dooks773be7e2008-07-23 21:30:45 -0700163
Chanwoo Choiae05c952014-10-13 15:52:33 -0700164 if (info->data->set_freq)
165 info->data->set_freq(info, freq);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700166
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700167 spin_unlock_irq(&info->pie_lock);
Alim Akhtar70c96df2016-07-05 15:28:53 +0530168 s3c_rtc_disable_clk(info);
Ben Dooks773be7e2008-07-23 21:30:45 -0700169
170 return 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700171}
172
173/* Time read/write */
Ben Dooks1add6782006-07-01 04:36:26 -0700174static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
175{
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700176 struct s3c_rtc *info = dev_get_drvdata(dev);
Ben Dooks1add6782006-07-01 04:36:26 -0700177 unsigned int have_retried = 0;
Krzysztof Kozlowski498bcf32017-06-16 21:28:07 +0200178 int ret;
Ben Dooks1add6782006-07-01 04:36:26 -0700179
Krzysztof Kozlowski498bcf32017-06-16 21:28:07 +0200180 ret = s3c_rtc_enable_clk(info);
181 if (ret)
182 return ret;
Chanwoo Choidf9e26d2014-10-13 15:52:35 -0700183
Krzysztof Kozlowskifc1afe62017-06-16 21:28:03 +0200184retry_get_time:
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700185 rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN);
186 rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
187 rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
188 rtc_tm->tm_mon = readb(info->base + S3C2410_RTCMON);
189 rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
190 rtc_tm->tm_sec = readb(info->base + S3C2410_RTCSEC);
Ben Dooks1add6782006-07-01 04:36:26 -0700191
Adam Buchbinder48fc7f72012-09-19 21:48:00 -0400192 /* the only way to work out whether the system was mid-update
Ben Dooks1add6782006-07-01 04:36:26 -0700193 * when we read it is to check the second counter, and if it
194 * is zero, then we re-try the entire read
195 */
196
197 if (rtc_tm->tm_sec == 0 && !have_retried) {
198 have_retried = 1;
199 goto retry_get_time;
200 }
201
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700202 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
203 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
204 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
205 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
206 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
207 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
Ben Dooks1add6782006-07-01 04:36:26 -0700208
Chanwoo Choi24e14552015-04-16 12:45:15 -0700209 s3c_rtc_disable_clk(info);
210
Ben Dooks1add6782006-07-01 04:36:26 -0700211 rtc_tm->tm_year += 100;
212 rtc_tm->tm_mon -= 1;
213
Andy Shevchenko9a1bacf2018-12-04 23:23:25 +0200214 dev_dbg(dev, "read time %ptR\n", rtc_tm);
Alexandre Belloni22652ba2018-02-19 16:23:56 +0100215 return 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700216}
217
218static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
219{
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700220 struct s3c_rtc *info = dev_get_drvdata(dev);
Ben Dooks641741e2006-08-27 01:23:27 -0700221 int year = tm->tm_year - 100;
Krzysztof Kozlowski498bcf32017-06-16 21:28:07 +0200222 int ret;
Ben Dooks1add6782006-07-01 04:36:26 -0700223
Andy Shevchenko9a1bacf2018-12-04 23:23:25 +0200224 dev_dbg(dev, "set time %ptR\n", tm);
Ben Dooks9a654512006-08-27 01:23:22 -0700225
Ben Dooks641741e2006-08-27 01:23:27 -0700226 /* we get around y2k by simply not supporting it */
227
228 if (year < 0 || year >= 100) {
229 dev_err(dev, "rtc only supports 100 years\n");
230 return -EINVAL;
231 }
232
Krzysztof Kozlowski498bcf32017-06-16 21:28:07 +0200233 ret = s3c_rtc_enable_clk(info);
234 if (ret)
235 return ret;
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700236
237 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC);
238 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN);
239 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
240 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
241 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
242 writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
243
Chanwoo Choi24e14552015-04-16 12:45:15 -0700244 s3c_rtc_disable_clk(info);
Ben Dooks1add6782006-07-01 04:36:26 -0700245
246 return 0;
247}
248
249static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
250{
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700251 struct s3c_rtc *info = dev_get_drvdata(dev);
Ben Dooks1add6782006-07-01 04:36:26 -0700252 struct rtc_time *alm_tm = &alrm->time;
253 unsigned int alm_en;
Krzysztof Kozlowski498bcf32017-06-16 21:28:07 +0200254 int ret;
Ben Dooks1add6782006-07-01 04:36:26 -0700255
Krzysztof Kozlowski498bcf32017-06-16 21:28:07 +0200256 ret = s3c_rtc_enable_clk(info);
257 if (ret)
258 return ret;
Chanwoo Choidf9e26d2014-10-13 15:52:35 -0700259
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700260 alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
261 alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
262 alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
263 alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON);
264 alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
265 alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
Ben Dooks1add6782006-07-01 04:36:26 -0700266
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700267 alm_en = readb(info->base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700268
Chanwoo Choi24e14552015-04-16 12:45:15 -0700269 s3c_rtc_disable_clk(info);
270
David Brownella2db8df2006-12-13 00:35:08 -0800271 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
272
Andy Shevchenko9a1bacf2018-12-04 23:23:25 +0200273 dev_dbg(dev, "read alarm %d, %ptR\n", alm_en, alm_tm);
Ben Dooks1add6782006-07-01 04:36:26 -0700274
Ben Dooks1add6782006-07-01 04:36:26 -0700275 /* decode the alarm enable field */
Ben Dooks1add6782006-07-01 04:36:26 -0700276 if (alm_en & S3C2410_RTCALM_SECEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700277 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
Ben Dooks1add6782006-07-01 04:36:26 -0700278
279 if (alm_en & S3C2410_RTCALM_MINEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700280 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
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
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
288 if (alm_en & S3C2410_RTCALM_MONEN) {
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700289 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
Ben Dooks1add6782006-07-01 04:36:26 -0700290 alm_tm->tm_mon -= 1;
Ben Dooks1add6782006-07-01 04:36:26 -0700291 }
292
293 if (alm_en & S3C2410_RTCALM_YEAREN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700294 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
Ben Dooks1add6782006-07-01 04:36:26 -0700295
296 return 0;
297}
298
299static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
300{
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700301 struct s3c_rtc *info = dev_get_drvdata(dev);
Ben Dooks1add6782006-07-01 04:36:26 -0700302 struct rtc_time *tm = &alrm->time;
303 unsigned int alrm_en;
Krzysztof Kozlowski498bcf32017-06-16 21:28:07 +0200304 int ret;
Ben Dooks1add6782006-07-01 04:36:26 -0700305
Andy Shevchenko9a1bacf2018-12-04 23:23:25 +0200306 dev_dbg(dev, "s3c_rtc_setalarm: %d, %ptR\n", alrm->enabled, tm);
Ben Dooks1add6782006-07-01 04:36:26 -0700307
Krzysztof Kozlowski498bcf32017-06-16 21:28:07 +0200308 ret = s3c_rtc_enable_clk(info);
309 if (ret)
310 return ret;
Chanwoo Choi24e14552015-04-16 12:45:15 -0700311
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700312 alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
313 writeb(0x00, info->base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700314
315 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
316 alrm_en |= S3C2410_RTCALM_SECEN;
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700317 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
Ben Dooks1add6782006-07-01 04:36:26 -0700318 }
319
320 if (tm->tm_min < 60 && tm->tm_min >= 0) {
321 alrm_en |= S3C2410_RTCALM_MINEN;
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700322 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
Ben Dooks1add6782006-07-01 04:36:26 -0700323 }
324
325 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
326 alrm_en |= S3C2410_RTCALM_HOUREN;
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700327 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
Ben Dooks1add6782006-07-01 04:36:26 -0700328 }
329
Krzysztof Kozlowskifb4ac3c2015-11-01 20:49:04 +0900330 if (tm->tm_mon < 12 && tm->tm_mon >= 0) {
331 alrm_en |= S3C2410_RTCALM_MONEN;
332 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON);
333 }
334
335 if (tm->tm_mday <= 31 && tm->tm_mday >= 1) {
336 alrm_en |= S3C2410_RTCALM_DAYEN;
337 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_ALMDATE);
338 }
339
Jingoo Hand4a48c22013-02-21 16:45:06 -0800340 dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
Ben Dooks1add6782006-07-01 04:36:26 -0700341
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700342 writeb(alrm_en, info->base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700343
Chanwoo Choi24e14552015-04-16 12:45:15 -0700344 s3c_rtc_setaie(dev, alrm->enabled);
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700345
Marek Szyprowski5a5b6142019-01-21 12:09:30 +0100346 s3c_rtc_disable_clk(info);
347
Ben Dooks1add6782006-07-01 04:36:26 -0700348 return 0;
349}
350
Ben Dooks1add6782006-07-01 04:36:26 -0700351static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
352{
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700353 struct s3c_rtc *info = dev_get_drvdata(dev);
Krzysztof Kozlowski498bcf32017-06-16 21:28:07 +0200354 int ret;
Ben Dooks1add6782006-07-01 04:36:26 -0700355
Krzysztof Kozlowski498bcf32017-06-16 21:28:07 +0200356 ret = s3c_rtc_enable_clk(info);
357 if (ret)
358 return ret;
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700359
Chanwoo Choiae05c952014-10-13 15:52:33 -0700360 if (info->data->enable_tick)
361 info->data->enable_tick(info, seq);
362
Chanwoo Choi24e14552015-04-16 12:45:15 -0700363 s3c_rtc_disable_clk(info);
Chanwoo Choiae05c952014-10-13 15:52:33 -0700364
Ben Dooks1add6782006-07-01 04:36:26 -0700365 return 0;
366}
367
David Brownellff8371a2006-09-30 23:28:17 -0700368static const struct rtc_class_ops s3c_rtcops = {
Ben Dooks1add6782006-07-01 04:36:26 -0700369 .read_time = s3c_rtc_gettime,
370 .set_time = s3c_rtc_settime,
371 .read_alarm = s3c_rtc_getalarm,
372 .set_alarm = s3c_rtc_setalarm,
Changhwan Youne6eb5242010-10-27 15:33:09 -0700373 .proc = s3c_rtc_proc,
374 .alarm_irq_enable = s3c_rtc_setaie,
Ben Dooks1add6782006-07-01 04:36:26 -0700375};
376
Chanwoo Choiae05c952014-10-13 15:52:33 -0700377static void s3c24xx_rtc_enable(struct s3c_rtc *info)
Ben Dooks1add6782006-07-01 04:36:26 -0700378{
Chanwoo Choid67288d2014-10-13 15:52:31 -0700379 unsigned int con, tmp;
Ben Dooks1add6782006-07-01 04:36:26 -0700380
Chanwoo Choid67288d2014-10-13 15:52:31 -0700381 con = readw(info->base + S3C2410_RTCCON);
Chanwoo Choiae05c952014-10-13 15:52:33 -0700382 /* re-enable the device, and check it is ok */
383 if ((con & S3C2410_RTCCON_RTCEN) == 0) {
384 dev_info(info->dev, "rtc disabled, re-enabling\n");
Ben Dooks1add6782006-07-01 04:36:26 -0700385
Chanwoo Choiae05c952014-10-13 15:52:33 -0700386 tmp = readw(info->base + S3C2410_RTCCON);
Krzysztof Kozlowskifc1afe62017-06-16 21:28:03 +0200387 writew(tmp | S3C2410_RTCCON_RTCEN, info->base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700388 }
Chanwoo Choiae05c952014-10-13 15:52:33 -0700389
390 if (con & S3C2410_RTCCON_CNTSEL) {
391 dev_info(info->dev, "removing RTCCON_CNTSEL\n");
392
393 tmp = readw(info->base + S3C2410_RTCCON);
394 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
Krzysztof Kozlowskifc1afe62017-06-16 21:28:03 +0200395 info->base + S3C2410_RTCCON);
Chanwoo Choiae05c952014-10-13 15:52:33 -0700396 }
397
398 if (con & S3C2410_RTCCON_CLKRST) {
399 dev_info(info->dev, "removing RTCCON_CLKRST\n");
400
401 tmp = readw(info->base + S3C2410_RTCCON);
402 writew(tmp & ~S3C2410_RTCCON_CLKRST,
Krzysztof Kozlowskifc1afe62017-06-16 21:28:03 +0200403 info->base + S3C2410_RTCCON);
Chanwoo Choiae05c952014-10-13 15:52:33 -0700404 }
Chanwoo Choiae05c952014-10-13 15:52:33 -0700405}
406
407static void s3c24xx_rtc_disable(struct s3c_rtc *info)
408{
409 unsigned int con;
410
Chanwoo Choiae05c952014-10-13 15:52:33 -0700411 con = readw(info->base + S3C2410_RTCCON);
412 con &= ~S3C2410_RTCCON_RTCEN;
413 writew(con, info->base + S3C2410_RTCCON);
414
415 con = readb(info->base + S3C2410_TICNT);
416 con &= ~S3C2410_TICNT_ENABLE;
417 writeb(con, info->base + S3C2410_TICNT);
Chanwoo Choiae05c952014-10-13 15:52:33 -0700418}
419
420static void s3c6410_rtc_disable(struct s3c_rtc *info)
421{
422 unsigned int con;
423
Chanwoo Choiae05c952014-10-13 15:52:33 -0700424 con = readw(info->base + S3C2410_RTCCON);
425 con &= ~S3C64XX_RTCCON_TICEN;
426 con &= ~S3C2410_RTCCON_RTCEN;
427 writew(con, info->base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700428}
429
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700430static int s3c_rtc_remove(struct platform_device *pdev)
Ben Dooks1add6782006-07-01 04:36:26 -0700431{
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700432 struct s3c_rtc *info = platform_get_drvdata(pdev);
Ben Dooks1add6782006-07-01 04:36:26 -0700433
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700434 s3c_rtc_setaie(info->dev, 0);
435
Joonyoung Shim7f23a932015-08-11 20:28:19 +0900436 if (info->data->needs_src_clk)
437 clk_unprepare(info->rtc_src_clk);
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700438 clk_unprepare(info->rtc_clk);
Atul Dahiyae48add82010-07-20 12:19:14 +0530439
Ben Dooks1add6782006-07-01 04:36:26 -0700440 return 0;
441}
442
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800443static int s3c_rtc_probe(struct platform_device *pdev)
Ben Dooks1add6782006-07-01 04:36:26 -0700444{
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700445 struct s3c_rtc *info = NULL;
Changhwan Youne1df9622010-10-27 15:33:10 -0700446 struct rtc_time rtc_tm;
Ben Dooks1add6782006-07-01 04:36:26 -0700447 struct resource *res;
448 int ret;
449
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700450 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
451 if (!info)
452 return -ENOMEM;
Ben Dooks1add6782006-07-01 04:36:26 -0700453
454 /* find the IRQs */
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700455 info->irq_tick = platform_get_irq(pdev, 1);
456 if (info->irq_tick < 0) {
Ben Dooks1add6782006-07-01 04:36:26 -0700457 dev_err(&pdev->dev, "no irq for rtc tick\n");
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700458 return info->irq_tick;
Ben Dooks1add6782006-07-01 04:36:26 -0700459 }
460
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700461 info->dev = &pdev->dev;
Marek Szyprowski64704c92019-01-18 14:28:37 +0100462 info->data = of_device_get_match_data(&pdev->dev);
Chanwoo Choiae05c952014-10-13 15:52:33 -0700463 if (!info->data) {
464 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
465 return -EINVAL;
466 }
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700467 spin_lock_init(&info->pie_lock);
Marek Szyprowski5a5b6142019-01-21 12:09:30 +0100468 spin_lock_init(&info->alarm_lock);
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700469
470 platform_set_drvdata(pdev, info);
471
472 info->irq_alarm = platform_get_irq(pdev, 0);
473 if (info->irq_alarm < 0) {
Ben Dooks1add6782006-07-01 04:36:26 -0700474 dev_err(&pdev->dev, "no irq for alarm\n");
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700475 return info->irq_alarm;
Ben Dooks1add6782006-07-01 04:36:26 -0700476 }
477
Jingoo Hand4a48c22013-02-21 16:45:06 -0800478 dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
Krzysztof Kozlowskifc1afe62017-06-16 21:28:03 +0200479 info->irq_tick, info->irq_alarm);
Ben Dooks1add6782006-07-01 04:36:26 -0700480
481 /* get the memory region */
Ben Dooks1add6782006-07-01 04:36:26 -0700482 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700483 info->base = devm_ioremap_resource(&pdev->dev, res);
484 if (IS_ERR(info->base))
485 return PTR_ERR(info->base);
Ben Dooks1add6782006-07-01 04:36:26 -0700486
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700487 info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
488 if (IS_ERR(info->rtc_clk)) {
Javier Martinez Canillasae6e00b2016-03-14 22:38:38 -0300489 ret = PTR_ERR(info->rtc_clk);
490 if (ret != -EPROBE_DEFER)
491 dev_err(&pdev->dev, "failed to find rtc clock\n");
492 else
493 dev_dbg(&pdev->dev, "probe deferred due to missing rtc clk\n");
494 return ret;
Atul Dahiyae48add82010-07-20 12:19:14 +0530495 }
Krzysztof Kozlowski9903f682017-06-16 21:28:06 +0200496 ret = clk_prepare_enable(info->rtc_clk);
497 if (ret)
498 return ret;
Atul Dahiyae48add82010-07-20 12:19:14 +0530499
Marek Szyprowskieaf3a652014-10-29 14:50:38 -0700500 if (info->data->needs_src_clk) {
501 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
502 if (IS_ERR(info->rtc_src_clk)) {
Javier Martinez Canillasae6e00b2016-03-14 22:38:38 -0300503 ret = PTR_ERR(info->rtc_src_clk);
504 if (ret != -EPROBE_DEFER)
505 dev_err(&pdev->dev,
506 "failed to find rtc source clock\n");
507 else
508 dev_dbg(&pdev->dev,
509 "probe deferred due to missing rtc src clk\n");
Krzysztof Kozlowski8768e7b2017-06-16 21:28:02 +0200510 goto err_src_clk;
Marek Szyprowskieaf3a652014-10-29 14:50:38 -0700511 }
Krzysztof Kozlowski9903f682017-06-16 21:28:06 +0200512 ret = clk_prepare_enable(info->rtc_src_clk);
513 if (ret)
514 goto err_src_clk;
Chanwoo Choidf9e26d2014-10-13 15:52:35 -0700515 }
Chanwoo Choidf9e26d2014-10-13 15:52:35 -0700516
Ben Dooks1add6782006-07-01 04:36:26 -0700517 /* check to see if everything is setup correctly */
Chanwoo Choiae05c952014-10-13 15:52:33 -0700518 if (info->data->enable)
519 info->data->enable(info);
Ben Dooks1add6782006-07-01 04:36:26 -0700520
Jingoo Hand4a48c22013-02-21 16:45:06 -0800521 dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
Krzysztof Kozlowskifc1afe62017-06-16 21:28:03 +0200522 readw(info->base + S3C2410_RTCCON));
Ben Dooks1add6782006-07-01 04:36:26 -0700523
Yauhen Kharuzhy51b76162008-10-29 14:01:16 -0700524 device_init_wakeup(&pdev->dev, 1);
525
Krzysztof Kozlowski202fe4c2015-04-16 12:45:57 -0700526 /* Check RTC Time */
Krzysztof Kozlowski492da682015-04-16 12:46:08 -0700527 if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) {
Krzysztof Kozlowski202fe4c2015-04-16 12:45:57 -0700528 rtc_tm.tm_year = 100;
529 rtc_tm.tm_mon = 0;
530 rtc_tm.tm_mday = 1;
531 rtc_tm.tm_hour = 0;
532 rtc_tm.tm_min = 0;
533 rtc_tm.tm_sec = 0;
534
535 s3c_rtc_settime(&pdev->dev, &rtc_tm);
536
537 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
538 }
539
Ben Dooks1add6782006-07-01 04:36:26 -0700540 /* register RTC and exit */
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700541 info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
Krzysztof Kozlowskifc1afe62017-06-16 21:28:03 +0200542 THIS_MODULE);
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700543 if (IS_ERR(info->rtc)) {
Ben Dooks1add6782006-07-01 04:36:26 -0700544 dev_err(&pdev->dev, "cannot attach rtc\n");
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700545 ret = PTR_ERR(info->rtc);
Ben Dooks1add6782006-07-01 04:36:26 -0700546 goto err_nortc;
547 }
548
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700549 ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
Krzysztof Kozlowskifc1afe62017-06-16 21:28:03 +0200550 0, "s3c2410-rtc alarm", info);
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700551 if (ret) {
552 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
553 goto err_nortc;
554 }
555
556 ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
Krzysztof Kozlowskifc1afe62017-06-16 21:28:03 +0200557 0, "s3c2410-rtc tick", info);
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700558 if (ret) {
559 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
560 goto err_nortc;
561 }
Maurus Cuelenaereeaa6e4d2010-06-04 14:14:46 -0700562
Chanwoo Choiae05c952014-10-13 15:52:33 -0700563 if (info->data->select_tick_clk)
564 info->data->select_tick_clk(info);
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900565
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700566 s3c_rtc_setfreq(info, 1);
Maurus Cuelenaeree893de52010-06-04 14:14:44 -0700567
Marek Szyprowski5a5b6142019-01-21 12:09:30 +0100568 s3c_rtc_disable_clk(info);
569
Ben Dooks1add6782006-07-01 04:36:26 -0700570 return 0;
571
Krzysztof Kozlowskifc1afe62017-06-16 21:28:03 +0200572err_nortc:
Chanwoo Choiae05c952014-10-13 15:52:33 -0700573 if (info->data->disable)
574 info->data->disable(info);
Chanwoo Choi24e14552015-04-16 12:45:15 -0700575
576 if (info->data->needs_src_clk)
577 clk_disable_unprepare(info->rtc_src_clk);
Krzysztof Kozlowski8768e7b2017-06-16 21:28:02 +0200578err_src_clk:
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700579 clk_disable_unprepare(info->rtc_clk);
Atul Dahiyae48add82010-07-20 12:19:14 +0530580
Ben Dooks1add6782006-07-01 04:36:26 -0700581 return ret;
582}
583
Jingoo Han32e445a2013-04-29 16:19:27 -0700584#ifdef CONFIG_PM_SLEEP
Ben Dooks1add6782006-07-01 04:36:26 -0700585
Jingoo Han32e445a2013-04-29 16:19:27 -0700586static int s3c_rtc_suspend(struct device *dev)
Ben Dooks1add6782006-07-01 04:36:26 -0700587{
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700588 struct s3c_rtc *info = dev_get_drvdata(dev);
Krzysztof Kozlowski498bcf32017-06-16 21:28:07 +0200589 int ret;
Jingoo Han32e445a2013-04-29 16:19:27 -0700590
Krzysztof Kozlowski498bcf32017-06-16 21:28:07 +0200591 ret = s3c_rtc_enable_clk(info);
592 if (ret)
593 return ret;
Chanwoo Choiae05c952014-10-13 15:52:33 -0700594
Ben Dooks1add6782006-07-01 04:36:26 -0700595 /* save TICNT for anyone using periodic interrupts */
Chanwoo Choiae05c952014-10-13 15:52:33 -0700596 if (info->data->save_tick_cnt)
597 info->data->save_tick_cnt(info);
598
599 if (info->data->disable)
600 info->data->disable(info);
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700601
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700602 if (device_may_wakeup(dev) && !info->wake_en) {
603 if (enable_irq_wake(info->irq_alarm) == 0)
604 info->wake_en = true;
Ben Dooks52cd4e52011-05-11 15:13:28 -0700605 else
Jingoo Han32e445a2013-04-29 16:19:27 -0700606 dev_err(dev, "enable_irq_wake failed\n");
Ben Dooks52cd4e52011-05-11 15:13:28 -0700607 }
Chanwoo Choiae05c952014-10-13 15:52:33 -0700608
Ben Dooks1add6782006-07-01 04:36:26 -0700609 return 0;
610}
611
Jingoo Han32e445a2013-04-29 16:19:27 -0700612static int s3c_rtc_resume(struct device *dev)
Ben Dooks1add6782006-07-01 04:36:26 -0700613{
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700614 struct s3c_rtc *info = dev_get_drvdata(dev);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700615
Chanwoo Choiae05c952014-10-13 15:52:33 -0700616 if (info->data->enable)
617 info->data->enable(info);
618
619 if (info->data->restore_tick_cnt)
620 info->data->restore_tick_cnt(info);
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700621
Chanwoo Choi24e14552015-04-16 12:45:15 -0700622 s3c_rtc_disable_clk(info);
623
Chanwoo Choi19be09f2014-10-13 15:52:28 -0700624 if (device_may_wakeup(dev) && info->wake_en) {
625 disable_irq_wake(info->irq_alarm);
626 info->wake_en = false;
Ben Dooks52cd4e52011-05-11 15:13:28 -0700627 }
Chanwoo Choiae05c952014-10-13 15:52:33 -0700628
Ben Dooks1add6782006-07-01 04:36:26 -0700629 return 0;
630}
Ben Dooks1add6782006-07-01 04:36:26 -0700631#endif
Jingoo Han32e445a2013-04-29 16:19:27 -0700632static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
633
Chanwoo Choiae05c952014-10-13 15:52:33 -0700634static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
635{
Chanwoo Choiae05c952014-10-13 15:52:33 -0700636 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
Chanwoo Choiae05c952014-10-13 15:52:33 -0700637}
638
639static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
640{
Chanwoo Choiae05c952014-10-13 15:52:33 -0700641 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
642 writeb(mask, info->base + S3C2410_INTP);
Chanwoo Choiae05c952014-10-13 15:52:33 -0700643}
644
645static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq)
646{
647 unsigned int tmp = 0;
648 int val;
649
650 tmp = readb(info->base + S3C2410_TICNT);
651 tmp &= S3C2410_TICNT_ENABLE;
652
653 val = (info->rtc->max_user_freq / freq) - 1;
654 tmp |= val;
655
656 writel(tmp, info->base + S3C2410_TICNT);
657}
658
659static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq)
660{
661 unsigned int tmp = 0;
662 int val;
663
664 tmp = readb(info->base + S3C2410_TICNT);
665 tmp &= S3C2410_TICNT_ENABLE;
666
667 val = (info->rtc->max_user_freq / freq) - 1;
668
669 tmp |= S3C2443_TICNT_PART(val);
670 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
671
672 writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2);
673
674 writel(tmp, info->base + S3C2410_TICNT);
675}
676
677static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq)
678{
679 unsigned int tmp = 0;
680 int val;
681
682 tmp = readb(info->base + S3C2410_TICNT);
683 tmp &= S3C2410_TICNT_ENABLE;
684
685 val = (info->rtc->max_user_freq / freq) - 1;
686
687 tmp |= S3C2443_TICNT_PART(val);
688 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
689
690 writel(tmp, info->base + S3C2410_TICNT);
691}
692
693static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq)
694{
695 int val;
696
697 val = (info->rtc->max_user_freq / freq) - 1;
698 writel(val, info->base + S3C2410_TICNT);
699}
700
701static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
702{
703 unsigned int ticnt;
704
705 ticnt = readb(info->base + S3C2410_TICNT);
706 ticnt &= S3C2410_TICNT_ENABLE;
707
708 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
709}
710
711static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info)
712{
713 unsigned int con;
714
715 con = readw(info->base + S3C2410_RTCCON);
716 con |= S3C2443_RTCCON_TICSEL;
717 writew(con, info->base + S3C2410_RTCCON);
718}
719
720static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
721{
722 unsigned int ticnt;
723
724 ticnt = readw(info->base + S3C2410_RTCCON);
725 ticnt &= S3C64XX_RTCCON_TICEN;
726
727 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
728}
729
730static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info)
731{
732 info->ticnt_save = readb(info->base + S3C2410_TICNT);
733}
734
735static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info)
736{
737 writeb(info->ticnt_save, info->base + S3C2410_TICNT);
738}
739
740static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info)
741{
742 info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
743 info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
744 info->ticnt_save = readl(info->base + S3C2410_TICNT);
745}
746
747static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
748{
749 unsigned int con;
750
751 writel(info->ticnt_save, info->base + S3C2410_TICNT);
752 if (info->ticnt_en_save) {
753 con = readw(info->base + S3C2410_RTCCON);
Krzysztof Kozlowskifc1afe62017-06-16 21:28:03 +0200754 writew(con | info->ticnt_en_save, info->base + S3C2410_RTCCON);
Chanwoo Choiae05c952014-10-13 15:52:33 -0700755 }
756}
757
758static struct s3c_rtc_data const s3c2410_rtc_data = {
759 .max_user_freq = 128,
760 .irq_handler = s3c24xx_rtc_irq,
761 .set_freq = s3c2410_rtc_setfreq,
762 .enable_tick = s3c24xx_rtc_enable_tick,
763 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
764 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
765 .enable = s3c24xx_rtc_enable,
766 .disable = s3c24xx_rtc_disable,
767};
768
769static struct s3c_rtc_data const s3c2416_rtc_data = {
770 .max_user_freq = 32768,
771 .irq_handler = s3c24xx_rtc_irq,
772 .set_freq = s3c2416_rtc_setfreq,
773 .enable_tick = s3c24xx_rtc_enable_tick,
774 .select_tick_clk = s3c2416_rtc_select_tick_clk,
775 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
776 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
777 .enable = s3c24xx_rtc_enable,
778 .disable = s3c24xx_rtc_disable,
779};
780
781static struct s3c_rtc_data const s3c2443_rtc_data = {
782 .max_user_freq = 32768,
783 .irq_handler = s3c24xx_rtc_irq,
784 .set_freq = s3c2443_rtc_setfreq,
785 .enable_tick = s3c24xx_rtc_enable_tick,
786 .select_tick_clk = s3c2416_rtc_select_tick_clk,
787 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
788 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
789 .enable = s3c24xx_rtc_enable,
790 .disable = s3c24xx_rtc_disable,
791};
792
793static struct s3c_rtc_data const s3c6410_rtc_data = {
794 .max_user_freq = 32768,
Javier Martinez Canillas8792f7772015-03-12 16:25:49 -0700795 .needs_src_clk = true,
Chanwoo Choiae05c952014-10-13 15:52:33 -0700796 .irq_handler = s3c6410_rtc_irq,
797 .set_freq = s3c6410_rtc_setfreq,
798 .enable_tick = s3c6410_rtc_enable_tick,
799 .save_tick_cnt = s3c6410_rtc_save_tick_cnt,
800 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt,
801 .enable = s3c24xx_rtc_enable,
802 .disable = s3c6410_rtc_disable,
Tushar Beherac3cba922012-04-12 12:49:14 -0700803};
804
Thomas Abraham39ce4082011-10-24 14:49:04 +0200805static const struct of_device_id s3c_rtc_dt_match[] = {
Heiko Stuebnerd2524ca2011-12-24 10:52:14 +0900806 {
Tushar Beheracd1e6f92012-04-12 12:49:14 -0700807 .compatible = "samsung,s3c2410-rtc",
Krzysztof Kozlowski21df6fe2017-06-16 21:28:04 +0200808 .data = &s3c2410_rtc_data,
Heiko Stuebnerd2524ca2011-12-24 10:52:14 +0900809 }, {
Tushar Beheracd1e6f92012-04-12 12:49:14 -0700810 .compatible = "samsung,s3c2416-rtc",
Krzysztof Kozlowski21df6fe2017-06-16 21:28:04 +0200811 .data = &s3c2416_rtc_data,
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900812 }, {
Tushar Beheracd1e6f92012-04-12 12:49:14 -0700813 .compatible = "samsung,s3c2443-rtc",
Krzysztof Kozlowski21df6fe2017-06-16 21:28:04 +0200814 .data = &s3c2443_rtc_data,
Heiko Stuebner25c1a242011-12-24 10:52:19 +0900815 }, {
Tushar Beheracd1e6f92012-04-12 12:49:14 -0700816 .compatible = "samsung,s3c6410-rtc",
Krzysztof Kozlowski21df6fe2017-06-16 21:28:04 +0200817 .data = &s3c6410_rtc_data,
Chanwoo Choidf9e26d2014-10-13 15:52:35 -0700818 }, {
819 .compatible = "samsung,exynos3250-rtc",
Krzysztof Kozlowski21df6fe2017-06-16 21:28:04 +0200820 .data = &s3c6410_rtc_data,
Heiko Stuebnerd2524ca2011-12-24 10:52:14 +0900821 },
Chanwoo Choiae05c952014-10-13 15:52:33 -0700822 { /* sentinel */ },
Thomas Abraham39ce4082011-10-24 14:49:04 +0200823};
824MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700825
826static struct platform_driver s3c_rtc_driver = {
Ben Dooks1add6782006-07-01 04:36:26 -0700827 .probe = s3c_rtc_probe,
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800828 .remove = s3c_rtc_remove,
Ben Dooks1add6782006-07-01 04:36:26 -0700829 .driver = {
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700830 .name = "s3c-rtc",
Jingoo Han32e445a2013-04-29 16:19:27 -0700831 .pm = &s3c_rtc_pm_ops,
Sachin Kamat04a373f2012-12-17 16:02:52 -0800832 .of_match_table = of_match_ptr(s3c_rtc_dt_match),
Ben Dooks1add6782006-07-01 04:36:26 -0700833 },
834};
Axel Lin0c4eae62012-01-10 15:10:48 -0800835module_platform_driver(s3c_rtc_driver);
Ben Dooks1add6782006-07-01 04:36:26 -0700836
837MODULE_DESCRIPTION("Samsung S3C RTC Driver");
838MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
839MODULE_LICENSE("GPL");
Kay Sieversad28a072008-04-10 21:29:25 -0700840MODULE_ALIAS("platform:s3c2410-rtc");