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Ben Dooks1add6782006-07-01 04:36:26 -07001/* drivers/rtc/rtc-s3c.c
2 *
Atul Dahiyae48add82010-07-20 12:19:14 +05303 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com/
5 *
Ben Dooks1add6782006-07-01 04:36:26 -07006 * Copyright (c) 2004,2006 Simtec Electronics
7 * Ben Dooks, <ben@simtec.co.uk>
8 * http://armlinux.simtec.co.uk/
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 * S3C2410/S3C2440/S3C24XX Internal RTC Driver
15*/
16
17#include <linux/module.h>
18#include <linux/fs.h>
19#include <linux/string.h>
20#include <linux/init.h>
21#include <linux/platform_device.h>
22#include <linux/interrupt.h>
23#include <linux/rtc.h>
24#include <linux/bcd.h>
25#include <linux/clk.h>
Robert P. J. Day9974b6e2008-02-06 01:38:42 -080026#include <linux/log2.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090027#include <linux/slab.h>
Ben Dooks1add6782006-07-01 04:36:26 -070028
Russell Kinga09e64f2008-08-05 16:14:15 +010029#include <mach/hardware.h>
Ben Dooks1add6782006-07-01 04:36:26 -070030#include <asm/uaccess.h>
31#include <asm/io.h>
32#include <asm/irq.h>
Ben Dookse2cd00c2008-10-30 10:14:34 +000033#include <plat/regs-rtc.h>
Ben Dooks1add6782006-07-01 04:36:26 -070034
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -070035enum s3c_cpu_type {
36 TYPE_S3C2410,
37 TYPE_S3C64XX,
38};
39
Ben Dooks1add6782006-07-01 04:36:26 -070040/* I have yet to find an S3C implementation with more than one
41 * of these rtc blocks in */
42
43static struct resource *s3c_rtc_mem;
44
Atul Dahiyae48add82010-07-20 12:19:14 +053045static struct clk *rtc_clk;
Ben Dooks1add6782006-07-01 04:36:26 -070046static void __iomem *s3c_rtc_base;
47static int s3c_rtc_alarmno = NO_IRQ;
48static int s3c_rtc_tickno = NO_IRQ;
Ben Dooks52cd4e52011-05-11 15:13:28 -070049static bool wake_en;
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -070050static enum s3c_cpu_type s3c_rtc_cpu_type;
Ben Dooks1add6782006-07-01 04:36:26 -070051
52static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
Ben Dooks1add6782006-07-01 04:36:26 -070053
Donggeun Kim88cee8f2011-09-14 16:22:19 -070054static void s3c_rtc_alarm_clk_enable(bool enable)
55{
56 static DEFINE_SPINLOCK(s3c_rtc_alarm_clk_lock);
57 static bool alarm_clk_enabled;
58 unsigned long irq_flags;
59
60 spin_lock_irqsave(&s3c_rtc_alarm_clk_lock, irq_flags);
61 if (enable) {
62 if (!alarm_clk_enabled) {
63 clk_enable(rtc_clk);
64 alarm_clk_enabled = true;
65 }
66 } else {
67 if (alarm_clk_enabled) {
68 clk_disable(rtc_clk);
69 alarm_clk_enabled = false;
70 }
71 }
72 spin_unlock_irqrestore(&s3c_rtc_alarm_clk_lock, irq_flags);
73}
74
Ben Dooks1add6782006-07-01 04:36:26 -070075/* IRQ Handlers */
76
David Howells7d12e782006-10-05 14:55:46 +010077static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
Ben Dooks1add6782006-07-01 04:36:26 -070078{
79 struct rtc_device *rdev = id;
80
Donggeun Kimcefe4fb2011-07-25 17:13:32 -070081 clk_enable(rtc_clk);
David Brownellab6a2d72007-05-08 00:33:30 -070082 rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
Atul Dahiya2f3478f2010-07-20 16:02:51 +053083
84 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
85 writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
86
Donggeun Kimcefe4fb2011-07-25 17:13:32 -070087 clk_disable(rtc_clk);
Donggeun Kim88cee8f2011-09-14 16:22:19 -070088
89 s3c_rtc_alarm_clk_enable(false);
90
Ben Dooks1add6782006-07-01 04:36:26 -070091 return IRQ_HANDLED;
92}
93
David Howells7d12e782006-10-05 14:55:46 +010094static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
Ben Dooks1add6782006-07-01 04:36:26 -070095{
96 struct rtc_device *rdev = id;
97
Donggeun Kimcefe4fb2011-07-25 17:13:32 -070098 clk_enable(rtc_clk);
Ben Dooks773be7e2008-07-23 21:30:45 -070099 rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
Atul Dahiya2f3478f2010-07-20 16:02:51 +0530100
101 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
102 writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
103
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700104 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700105 return IRQ_HANDLED;
106}
107
108/* Update control registers */
Axel Lin2ec38a02011-03-04 17:36:19 -0800109static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
Ben Dooks1add6782006-07-01 04:36:26 -0700110{
111 unsigned int tmp;
112
Axel Lin2ec38a02011-03-04 17:36:19 -0800113 pr_debug("%s: aie=%d\n", __func__, enabled);
Ben Dooks1add6782006-07-01 04:36:26 -0700114
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700115 clk_enable(rtc_clk);
Ben Dooks9a654512006-08-27 01:23:22 -0700116 tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
Ben Dooks1add6782006-07-01 04:36:26 -0700117
Axel Lin2ec38a02011-03-04 17:36:19 -0800118 if (enabled)
Ben Dooks1add6782006-07-01 04:36:26 -0700119 tmp |= S3C2410_RTCALM_ALMEN;
120
Ben Dooks9a654512006-08-27 01:23:22 -0700121 writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700122 clk_disable(rtc_clk);
Axel Lin2ec38a02011-03-04 17:36:19 -0800123
Donggeun Kim88cee8f2011-09-14 16:22:19 -0700124 s3c_rtc_alarm_clk_enable(enabled);
125
Axel Lin2ec38a02011-03-04 17:36:19 -0800126 return 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700127}
128
Ben Dooks773be7e2008-07-23 21:30:45 -0700129static int s3c_rtc_setfreq(struct device *dev, int freq)
Ben Dooks1add6782006-07-01 04:36:26 -0700130{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700131 struct platform_device *pdev = to_platform_device(dev);
132 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
133 unsigned int tmp = 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700134
Jonathan Cameron5d2a5032009-01-06 14:42:12 -0800135 if (!is_power_of_2(freq))
136 return -EINVAL;
137
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700138 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700139 spin_lock_irq(&s3c_rtc_pie_lock);
Ben Dooks773be7e2008-07-23 21:30:45 -0700140
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700141 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
142 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
143 tmp &= S3C2410_TICNT_ENABLE;
144 }
145
146 tmp |= (rtc_dev->max_user_freq / freq)-1;
Ben Dooks1add6782006-07-01 04:36:26 -0700147
Atul Dahiya2f3478f2010-07-20 16:02:51 +0530148 writel(tmp, s3c_rtc_base + S3C2410_TICNT);
Ben Dooks1add6782006-07-01 04:36:26 -0700149 spin_unlock_irq(&s3c_rtc_pie_lock);
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700150 clk_disable(rtc_clk);
Ben Dooks773be7e2008-07-23 21:30:45 -0700151
152 return 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700153}
154
155/* Time read/write */
156
157static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
158{
159 unsigned int have_retried = 0;
Ben Dooks9a654512006-08-27 01:23:22 -0700160 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700161
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700162 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700163 retry_get_time:
Ben Dooks9a654512006-08-27 01:23:22 -0700164 rtc_tm->tm_min = readb(base + S3C2410_RTCMIN);
165 rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
166 rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
167 rtc_tm->tm_mon = readb(base + S3C2410_RTCMON);
168 rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
169 rtc_tm->tm_sec = readb(base + S3C2410_RTCSEC);
Ben Dooks1add6782006-07-01 04:36:26 -0700170
171 /* the only way to work out wether the system was mid-update
172 * when we read it is to check the second counter, and if it
173 * is zero, then we re-try the entire read
174 */
175
176 if (rtc_tm->tm_sec == 0 && !have_retried) {
177 have_retried = 1;
178 goto retry_get_time;
179 }
180
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700181 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
182 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
183 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
184 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
185 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
186 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
Ben Dooks1add6782006-07-01 04:36:26 -0700187
188 rtc_tm->tm_year += 100;
MyungJoo Ham4e8896c2011-08-25 15:59:22 -0700189
190 pr_debug("read time %04d.%02d.%02d %02d:%02d:%02d\n",
191 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
192 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
193
Ben Dooks1add6782006-07-01 04:36:26 -0700194 rtc_tm->tm_mon -= 1;
195
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700196 clk_disable(rtc_clk);
Kukjin Kim5b3ffdd2010-10-27 15:33:11 -0700197 return rtc_valid_tm(rtc_tm);
Ben Dooks1add6782006-07-01 04:36:26 -0700198}
199
200static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
201{
Ben Dooks9a654512006-08-27 01:23:22 -0700202 void __iomem *base = s3c_rtc_base;
Ben Dooks641741e2006-08-27 01:23:27 -0700203 int year = tm->tm_year - 100;
Ben Dooks1add6782006-07-01 04:36:26 -0700204
Kukjin Kim30ffc402010-10-27 15:33:09 -0700205 pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
206 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
Ben Dooks9a654512006-08-27 01:23:22 -0700207 tm->tm_hour, tm->tm_min, tm->tm_sec);
208
Ben Dooks641741e2006-08-27 01:23:27 -0700209 /* we get around y2k by simply not supporting it */
210
211 if (year < 0 || year >= 100) {
212 dev_err(dev, "rtc only supports 100 years\n");
213 return -EINVAL;
214 }
215
Jonghwan Choi2dbcd052011-12-08 14:34:02 -0800216 clk_enable(rtc_clk);
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700217 writeb(bin2bcd(tm->tm_sec), base + S3C2410_RTCSEC);
218 writeb(bin2bcd(tm->tm_min), base + S3C2410_RTCMIN);
219 writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
220 writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
221 writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
222 writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700223 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700224
225 return 0;
226}
227
228static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
229{
230 struct rtc_time *alm_tm = &alrm->time;
Ben Dooks9a654512006-08-27 01:23:22 -0700231 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700232 unsigned int alm_en;
233
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700234 clk_enable(rtc_clk);
Ben Dooks9a654512006-08-27 01:23:22 -0700235 alm_tm->tm_sec = readb(base + S3C2410_ALMSEC);
236 alm_tm->tm_min = readb(base + S3C2410_ALMMIN);
237 alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
238 alm_tm->tm_mon = readb(base + S3C2410_ALMMON);
239 alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
240 alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
Ben Dooks1add6782006-07-01 04:36:26 -0700241
Ben Dooks9a654512006-08-27 01:23:22 -0700242 alm_en = readb(base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700243
David Brownella2db8df2006-12-13 00:35:08 -0800244 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
245
Kukjin Kim30ffc402010-10-27 15:33:09 -0700246 pr_debug("read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
Ben Dooks1add6782006-07-01 04:36:26 -0700247 alm_en,
Kukjin Kim30ffc402010-10-27 15:33:09 -0700248 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
Ben Dooks1add6782006-07-01 04:36:26 -0700249 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
250
251
252 /* decode the alarm enable field */
253
254 if (alm_en & S3C2410_RTCALM_SECEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700255 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
Ben Dooks1add6782006-07-01 04:36:26 -0700256 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700257 alm_tm->tm_sec = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700258
259 if (alm_en & S3C2410_RTCALM_MINEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700260 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
Ben Dooks1add6782006-07-01 04:36:26 -0700261 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700262 alm_tm->tm_min = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700263
264 if (alm_en & S3C2410_RTCALM_HOUREN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700265 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
Ben Dooks1add6782006-07-01 04:36:26 -0700266 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700267 alm_tm->tm_hour = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700268
269 if (alm_en & S3C2410_RTCALM_DAYEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700270 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
Ben Dooks1add6782006-07-01 04:36:26 -0700271 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700272 alm_tm->tm_mday = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700273
274 if (alm_en & S3C2410_RTCALM_MONEN) {
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700275 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
Ben Dooks1add6782006-07-01 04:36:26 -0700276 alm_tm->tm_mon -= 1;
277 } else {
Changhwan Youndd061d12010-10-27 15:33:08 -0700278 alm_tm->tm_mon = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700279 }
280
281 if (alm_en & S3C2410_RTCALM_YEAREN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700282 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
Ben Dooks1add6782006-07-01 04:36:26 -0700283 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700284 alm_tm->tm_year = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700285
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700286 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700287 return 0;
288}
289
290static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
291{
292 struct rtc_time *tm = &alrm->time;
Ben Dooks9a654512006-08-27 01:23:22 -0700293 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700294 unsigned int alrm_en;
295
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700296 clk_enable(rtc_clk);
Kukjin Kim30ffc402010-10-27 15:33:09 -0700297 pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
Ben Dooks1add6782006-07-01 04:36:26 -0700298 alrm->enabled,
MyungJoo Ham4e8896c2011-08-25 15:59:22 -0700299 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
Kukjin Kim30ffc402010-10-27 15:33:09 -0700300 tm->tm_hour, tm->tm_min, tm->tm_sec);
Ben Dooks1add6782006-07-01 04:36:26 -0700301
Ben Dooks9a654512006-08-27 01:23:22 -0700302 alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
303 writeb(0x00, base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700304
305 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
306 alrm_en |= S3C2410_RTCALM_SECEN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700307 writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
Ben Dooks1add6782006-07-01 04:36:26 -0700308 }
309
310 if (tm->tm_min < 60 && tm->tm_min >= 0) {
311 alrm_en |= S3C2410_RTCALM_MINEN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700312 writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
Ben Dooks1add6782006-07-01 04:36:26 -0700313 }
314
315 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
316 alrm_en |= S3C2410_RTCALM_HOUREN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700317 writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
Ben Dooks1add6782006-07-01 04:36:26 -0700318 }
319
320 pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
321
Ben Dooks9a654512006-08-27 01:23:22 -0700322 writeb(alrm_en, base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700323
Axel Lin2ec38a02011-03-04 17:36:19 -0800324 s3c_rtc_setaie(dev, alrm->enabled);
Ben Dooks1add6782006-07-01 04:36:26 -0700325
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700326 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700327 return 0;
328}
329
Ben Dooks1add6782006-07-01 04:36:26 -0700330static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
331{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700332 unsigned int ticnt;
Ben Dooks1add6782006-07-01 04:36:26 -0700333
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700334 clk_enable(rtc_clk);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700335 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700336 ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700337 ticnt &= S3C64XX_RTCCON_TICEN;
338 } else {
339 ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
340 ticnt &= S3C2410_TICNT_ENABLE;
341 }
342
343 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700344 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700345 return 0;
346}
347
David Brownellff8371a2006-09-30 23:28:17 -0700348static const struct rtc_class_ops s3c_rtcops = {
Ben Dooks1add6782006-07-01 04:36:26 -0700349 .read_time = s3c_rtc_gettime,
350 .set_time = s3c_rtc_settime,
351 .read_alarm = s3c_rtc_getalarm,
352 .set_alarm = s3c_rtc_setalarm,
Changhwan Youne6eb5242010-10-27 15:33:09 -0700353 .proc = s3c_rtc_proc,
354 .alarm_irq_enable = s3c_rtc_setaie,
Ben Dooks1add6782006-07-01 04:36:26 -0700355};
356
357static void s3c_rtc_enable(struct platform_device *pdev, int en)
358{
Ben Dooks9a654512006-08-27 01:23:22 -0700359 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700360 unsigned int tmp;
361
362 if (s3c_rtc_base == NULL)
363 return;
364
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700365 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700366 if (!en) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700367 tmp = readw(base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700368 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
369 tmp &= ~S3C64XX_RTCCON_TICEN;
370 tmp &= ~S3C2410_RTCCON_RTCEN;
Changhwan Younf61ae672010-10-27 15:33:06 -0700371 writew(tmp, base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700372
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700373 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
374 tmp = readb(base + S3C2410_TICNT);
375 tmp &= ~S3C2410_TICNT_ENABLE;
376 writeb(tmp, base + S3C2410_TICNT);
377 }
Ben Dooks1add6782006-07-01 04:36:26 -0700378 } else {
379 /* re-enable the device, and check it is ok */
380
Changhwan Younf61ae672010-10-27 15:33:06 -0700381 if ((readw(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
Ben Dooks1add6782006-07-01 04:36:26 -0700382 dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
383
Changhwan Younf61ae672010-10-27 15:33:06 -0700384 tmp = readw(base + S3C2410_RTCCON);
385 writew(tmp | S3C2410_RTCCON_RTCEN,
386 base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700387 }
388
Changhwan Younf61ae672010-10-27 15:33:06 -0700389 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {
Ben Dooks1add6782006-07-01 04:36:26 -0700390 dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
391
Changhwan Younf61ae672010-10-27 15:33:06 -0700392 tmp = readw(base + S3C2410_RTCCON);
393 writew(tmp & ~S3C2410_RTCCON_CNTSEL,
394 base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700395 }
396
Changhwan Younf61ae672010-10-27 15:33:06 -0700397 if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {
Ben Dooks1add6782006-07-01 04:36:26 -0700398 dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
399
Changhwan Younf61ae672010-10-27 15:33:06 -0700400 tmp = readw(base + S3C2410_RTCCON);
401 writew(tmp & ~S3C2410_RTCCON_CLKRST,
402 base + S3C2410_RTCCON);
Ben Dooks1add6782006-07-01 04:36:26 -0700403 }
404 }
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700405 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700406}
407
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700408static int __devexit s3c_rtc_remove(struct platform_device *dev)
Ben Dooks1add6782006-07-01 04:36:26 -0700409{
410 struct rtc_device *rtc = platform_get_drvdata(dev);
411
MyungJoo Ham62d17602011-08-25 15:59:24 -0700412 free_irq(s3c_rtc_alarmno, rtc);
413 free_irq(s3c_rtc_tickno, rtc);
414
Ben Dooks1add6782006-07-01 04:36:26 -0700415 platform_set_drvdata(dev, NULL);
416 rtc_device_unregister(rtc);
417
Axel Lin2ec38a02011-03-04 17:36:19 -0800418 s3c_rtc_setaie(&dev->dev, 0);
Ben Dooks1add6782006-07-01 04:36:26 -0700419
Atul Dahiyae48add82010-07-20 12:19:14 +0530420 clk_put(rtc_clk);
421 rtc_clk = NULL;
422
Ben Dooks1add6782006-07-01 04:36:26 -0700423 iounmap(s3c_rtc_base);
424 release_resource(s3c_rtc_mem);
425 kfree(s3c_rtc_mem);
426
427 return 0;
428}
429
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700430static int __devinit s3c_rtc_probe(struct platform_device *pdev)
Ben Dooks1add6782006-07-01 04:36:26 -0700431{
432 struct rtc_device *rtc;
Changhwan Youne1df9622010-10-27 15:33:10 -0700433 struct rtc_time rtc_tm;
Ben Dooks1add6782006-07-01 04:36:26 -0700434 struct resource *res;
435 int ret;
436
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700437 pr_debug("%s: probe=%p\n", __func__, pdev);
Ben Dooks1add6782006-07-01 04:36:26 -0700438
439 /* find the IRQs */
440
441 s3c_rtc_tickno = platform_get_irq(pdev, 1);
442 if (s3c_rtc_tickno < 0) {
443 dev_err(&pdev->dev, "no irq for rtc tick\n");
444 return -ENOENT;
445 }
446
447 s3c_rtc_alarmno = platform_get_irq(pdev, 0);
448 if (s3c_rtc_alarmno < 0) {
449 dev_err(&pdev->dev, "no irq for alarm\n");
450 return -ENOENT;
451 }
452
453 pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
454 s3c_rtc_tickno, s3c_rtc_alarmno);
455
456 /* get the memory region */
457
458 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
459 if (res == NULL) {
460 dev_err(&pdev->dev, "failed to get memory region resource\n");
461 return -ENOENT;
462 }
463
Joe Perches28f65c112011-06-09 09:13:32 -0700464 s3c_rtc_mem = request_mem_region(res->start, resource_size(res),
Ben Dooks9a654512006-08-27 01:23:22 -0700465 pdev->name);
Ben Dooks1add6782006-07-01 04:36:26 -0700466
467 if (s3c_rtc_mem == NULL) {
468 dev_err(&pdev->dev, "failed to reserve memory region\n");
469 ret = -ENOENT;
470 goto err_nores;
471 }
472
Joe Perches28f65c112011-06-09 09:13:32 -0700473 s3c_rtc_base = ioremap(res->start, resource_size(res));
Ben Dooks1add6782006-07-01 04:36:26 -0700474 if (s3c_rtc_base == NULL) {
475 dev_err(&pdev->dev, "failed ioremap()\n");
476 ret = -EINVAL;
477 goto err_nomap;
478 }
479
Atul Dahiyae48add82010-07-20 12:19:14 +0530480 rtc_clk = clk_get(&pdev->dev, "rtc");
481 if (IS_ERR(rtc_clk)) {
482 dev_err(&pdev->dev, "failed to find rtc clock source\n");
483 ret = PTR_ERR(rtc_clk);
484 rtc_clk = NULL;
485 goto err_clk;
486 }
487
488 clk_enable(rtc_clk);
489
Ben Dooks1add6782006-07-01 04:36:26 -0700490 /* check to see if everything is setup correctly */
491
492 s3c_rtc_enable(pdev, 1);
493
Changhwan Younf61ae672010-10-27 15:33:06 -0700494 pr_debug("s3c2410_rtc: RTCCON=%02x\n",
495 readw(s3c_rtc_base + S3C2410_RTCCON));
Ben Dooks1add6782006-07-01 04:36:26 -0700496
Yauhen Kharuzhy51b76162008-10-29 14:01:16 -0700497 device_init_wakeup(&pdev->dev, 1);
498
Ben Dooks1add6782006-07-01 04:36:26 -0700499 /* register RTC and exit */
500
501 rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
502 THIS_MODULE);
503
504 if (IS_ERR(rtc)) {
505 dev_err(&pdev->dev, "cannot attach rtc\n");
506 ret = PTR_ERR(rtc);
507 goto err_nortc;
508 }
509
Maurus Cuelenaereeaa6e4d2010-06-04 14:14:46 -0700510 s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;
511
Taekgyun Ko051fe542010-07-29 13:00:42 +0900512 /* Check RTC Time */
513
Changhwan Youne1df9622010-10-27 15:33:10 -0700514 s3c_rtc_gettime(NULL, &rtc_tm);
Taekgyun Ko051fe542010-07-29 13:00:42 +0900515
Changhwan Youne1df9622010-10-27 15:33:10 -0700516 if (rtc_valid_tm(&rtc_tm)) {
517 rtc_tm.tm_year = 100;
518 rtc_tm.tm_mon = 0;
519 rtc_tm.tm_mday = 1;
520 rtc_tm.tm_hour = 0;
521 rtc_tm.tm_min = 0;
522 rtc_tm.tm_sec = 0;
523
524 s3c_rtc_settime(NULL, &rtc_tm);
525
526 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
Taekgyun Ko051fe542010-07-29 13:00:42 +0900527 }
528
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700529 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
530 rtc->max_user_freq = 32768;
531 else
532 rtc->max_user_freq = 128;
533
Ben Dooks1add6782006-07-01 04:36:26 -0700534 platform_set_drvdata(pdev, rtc);
Maurus Cuelenaeree893de52010-06-04 14:14:44 -0700535
536 s3c_rtc_setfreq(&pdev->dev, 1);
537
MyungJoo Ham62d17602011-08-25 15:59:24 -0700538 ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
539 IRQF_DISABLED, "s3c2410-rtc alarm", rtc);
540 if (ret) {
541 dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
542 goto err_alarm_irq;
543 }
544
545 ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
546 IRQF_DISABLED, "s3c2410-rtc tick", rtc);
547 if (ret) {
548 dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
549 free_irq(s3c_rtc_alarmno, rtc);
550 goto err_tick_irq;
551 }
552
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700553 clk_disable(rtc_clk);
554
Ben Dooks1add6782006-07-01 04:36:26 -0700555 return 0;
556
MyungJoo Ham62d17602011-08-25 15:59:24 -0700557 err_tick_irq:
558 free_irq(s3c_rtc_alarmno, rtc);
559
560 err_alarm_irq:
561 platform_set_drvdata(pdev, NULL);
562 rtc_device_unregister(rtc);
563
Ben Dooks1add6782006-07-01 04:36:26 -0700564 err_nortc:
565 s3c_rtc_enable(pdev, 0);
Atul Dahiyae48add82010-07-20 12:19:14 +0530566 clk_disable(rtc_clk);
567 clk_put(rtc_clk);
568
569 err_clk:
Ben Dooks1add6782006-07-01 04:36:26 -0700570 iounmap(s3c_rtc_base);
571
572 err_nomap:
573 release_resource(s3c_rtc_mem);
574
575 err_nores:
576 return ret;
577}
578
579#ifdef CONFIG_PM
580
581/* RTC Power management control */
582
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700583static int ticnt_save, ticnt_en_save;
Ben Dooks1add6782006-07-01 04:36:26 -0700584
585static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
586{
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700587 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700588 /* save TICNT for anyone using periodic interrupts */
Ben Dooks9a654512006-08-27 01:23:22 -0700589 ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700590 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700591 ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700592 ticnt_en_save &= S3C64XX_RTCCON_TICEN;
593 }
Ben Dooks1add6782006-07-01 04:36:26 -0700594 s3c_rtc_enable(pdev, 0);
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700595
Ben Dooks52cd4e52011-05-11 15:13:28 -0700596 if (device_may_wakeup(&pdev->dev) && !wake_en) {
597 if (enable_irq_wake(s3c_rtc_alarmno) == 0)
598 wake_en = true;
599 else
600 dev_err(&pdev->dev, "enable_irq_wake failed\n");
601 }
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700602 clk_disable(rtc_clk);
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700603
Ben Dooks1add6782006-07-01 04:36:26 -0700604 return 0;
605}
606
607static int s3c_rtc_resume(struct platform_device *pdev)
608{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700609 unsigned int tmp;
610
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700611 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700612 s3c_rtc_enable(pdev, 1);
Ben Dooks9a654512006-08-27 01:23:22 -0700613 writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700614 if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700615 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
616 writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700617 }
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700618
Ben Dooks52cd4e52011-05-11 15:13:28 -0700619 if (device_may_wakeup(&pdev->dev) && wake_en) {
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700620 disable_irq_wake(s3c_rtc_alarmno);
Ben Dooks52cd4e52011-05-11 15:13:28 -0700621 wake_en = false;
622 }
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700623 clk_disable(rtc_clk);
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700624
Ben Dooks1add6782006-07-01 04:36:26 -0700625 return 0;
626}
627#else
628#define s3c_rtc_suspend NULL
629#define s3c_rtc_resume NULL
630#endif
631
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700632static struct platform_device_id s3c_rtc_driver_ids[] = {
633 {
634 .name = "s3c2410-rtc",
635 .driver_data = TYPE_S3C2410,
636 }, {
637 .name = "s3c64xx-rtc",
638 .driver_data = TYPE_S3C64XX,
639 },
640 { }
641};
642
643MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
644
645static struct platform_driver s3c_rtc_driver = {
Ben Dooks1add6782006-07-01 04:36:26 -0700646 .probe = s3c_rtc_probe,
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700647 .remove = __devexit_p(s3c_rtc_remove),
Ben Dooks1add6782006-07-01 04:36:26 -0700648 .suspend = s3c_rtc_suspend,
649 .resume = s3c_rtc_resume,
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700650 .id_table = s3c_rtc_driver_ids,
Ben Dooks1add6782006-07-01 04:36:26 -0700651 .driver = {
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700652 .name = "s3c-rtc",
Ben Dooks1add6782006-07-01 04:36:26 -0700653 .owner = THIS_MODULE,
654 },
655};
656
657static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
658
659static int __init s3c_rtc_init(void)
660{
661 printk(banner);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700662 return platform_driver_register(&s3c_rtc_driver);
Ben Dooks1add6782006-07-01 04:36:26 -0700663}
664
665static void __exit s3c_rtc_exit(void)
666{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700667 platform_driver_unregister(&s3c_rtc_driver);
Ben Dooks1add6782006-07-01 04:36:26 -0700668}
669
670module_init(s3c_rtc_init);
671module_exit(s3c_rtc_exit);
672
673MODULE_DESCRIPTION("Samsung S3C RTC Driver");
674MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
675MODULE_LICENSE("GPL");
Kay Sieversad28a072008-04-10 21:29:25 -0700676MODULE_ALIAS("platform:s3c2410-rtc");