blob: 067207afc08636e75daf2ef2ae7c0002f5f02e68 [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>
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
54/* IRQ Handlers */
55
David Howells7d12e782006-10-05 14:55:46 +010056static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
Ben Dooks1add6782006-07-01 04:36:26 -070057{
58 struct rtc_device *rdev = id;
59
Donggeun Kimcefe4fb2011-07-25 17:13:32 -070060 clk_enable(rtc_clk);
David Brownellab6a2d72007-05-08 00:33:30 -070061 rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
Atul Dahiya2f3478f2010-07-20 16:02:51 +053062
63 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
64 writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
65
Donggeun Kimcefe4fb2011-07-25 17:13:32 -070066 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -070067 return IRQ_HANDLED;
68}
69
David Howells7d12e782006-10-05 14:55:46 +010070static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
Ben Dooks1add6782006-07-01 04:36:26 -070071{
72 struct rtc_device *rdev = id;
73
Donggeun Kimcefe4fb2011-07-25 17:13:32 -070074 clk_enable(rtc_clk);
Ben Dooks773be7e2008-07-23 21:30:45 -070075 rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
Atul Dahiya2f3478f2010-07-20 16:02:51 +053076
77 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
78 writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
79
Donggeun Kimcefe4fb2011-07-25 17:13:32 -070080 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -070081 return IRQ_HANDLED;
82}
83
84/* Update control registers */
Axel Lin2ec38a02011-03-04 17:36:19 -080085static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
Ben Dooks1add6782006-07-01 04:36:26 -070086{
87 unsigned int tmp;
88
Axel Lin2ec38a02011-03-04 17:36:19 -080089 pr_debug("%s: aie=%d\n", __func__, enabled);
Ben Dooks1add6782006-07-01 04:36:26 -070090
Donggeun Kimcefe4fb2011-07-25 17:13:32 -070091 clk_enable(rtc_clk);
Ben Dooks9a654512006-08-27 01:23:22 -070092 tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
Ben Dooks1add6782006-07-01 04:36:26 -070093
Axel Lin2ec38a02011-03-04 17:36:19 -080094 if (enabled)
Ben Dooks1add6782006-07-01 04:36:26 -070095 tmp |= S3C2410_RTCALM_ALMEN;
96
Ben Dooks9a654512006-08-27 01:23:22 -070097 writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
Donggeun Kimcefe4fb2011-07-25 17:13:32 -070098 clk_disable(rtc_clk);
Axel Lin2ec38a02011-03-04 17:36:19 -080099
100 return 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700101}
102
Ben Dooks773be7e2008-07-23 21:30:45 -0700103static int s3c_rtc_setfreq(struct device *dev, int freq)
Ben Dooks1add6782006-07-01 04:36:26 -0700104{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700105 struct platform_device *pdev = to_platform_device(dev);
106 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
107 unsigned int tmp = 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700108
Jonathan Cameron5d2a5032009-01-06 14:42:12 -0800109 if (!is_power_of_2(freq))
110 return -EINVAL;
111
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700112 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700113 spin_lock_irq(&s3c_rtc_pie_lock);
Ben Dooks773be7e2008-07-23 21:30:45 -0700114
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700115 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
116 tmp = readb(s3c_rtc_base + S3C2410_TICNT);
117 tmp &= S3C2410_TICNT_ENABLE;
118 }
119
120 tmp |= (rtc_dev->max_user_freq / freq)-1;
Ben Dooks1add6782006-07-01 04:36:26 -0700121
Atul Dahiya2f3478f2010-07-20 16:02:51 +0530122 writel(tmp, s3c_rtc_base + S3C2410_TICNT);
Ben Dooks1add6782006-07-01 04:36:26 -0700123 spin_unlock_irq(&s3c_rtc_pie_lock);
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700124 clk_disable(rtc_clk);
Ben Dooks773be7e2008-07-23 21:30:45 -0700125
126 return 0;
Ben Dooks1add6782006-07-01 04:36:26 -0700127}
128
129/* Time read/write */
130
131static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
132{
133 unsigned int have_retried = 0;
Ben Dooks9a654512006-08-27 01:23:22 -0700134 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700135
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700136 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700137 retry_get_time:
Ben Dooks9a654512006-08-27 01:23:22 -0700138 rtc_tm->tm_min = readb(base + S3C2410_RTCMIN);
139 rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
140 rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
141 rtc_tm->tm_mon = readb(base + S3C2410_RTCMON);
142 rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
143 rtc_tm->tm_sec = readb(base + S3C2410_RTCSEC);
Ben Dooks1add6782006-07-01 04:36:26 -0700144
145 /* the only way to work out wether the system was mid-update
146 * when we read it is to check the second counter, and if it
147 * is zero, then we re-try the entire read
148 */
149
150 if (rtc_tm->tm_sec == 0 && !have_retried) {
151 have_retried = 1;
152 goto retry_get_time;
153 }
154
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700155 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
156 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
157 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
158 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
159 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
160 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
Ben Dooks1add6782006-07-01 04:36:26 -0700161
162 rtc_tm->tm_year += 100;
MyungJoo Ham4e8896c2011-08-25 15:59:22 -0700163
164 pr_debug("read time %04d.%02d.%02d %02d:%02d:%02d\n",
165 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
166 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
167
Ben Dooks1add6782006-07-01 04:36:26 -0700168 rtc_tm->tm_mon -= 1;
169
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700170 clk_disable(rtc_clk);
Kukjin Kim5b3ffdd2010-10-27 15:33:11 -0700171 return rtc_valid_tm(rtc_tm);
Ben Dooks1add6782006-07-01 04:36:26 -0700172}
173
174static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
175{
Ben Dooks9a654512006-08-27 01:23:22 -0700176 void __iomem *base = s3c_rtc_base;
Ben Dooks641741e2006-08-27 01:23:27 -0700177 int year = tm->tm_year - 100;
Ben Dooks1add6782006-07-01 04:36:26 -0700178
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700179 clk_enable(rtc_clk);
Kukjin Kim30ffc402010-10-27 15:33:09 -0700180 pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
181 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
Ben Dooks9a654512006-08-27 01:23:22 -0700182 tm->tm_hour, tm->tm_min, tm->tm_sec);
183
Ben Dooks641741e2006-08-27 01:23:27 -0700184 /* we get around y2k by simply not supporting it */
185
186 if (year < 0 || year >= 100) {
187 dev_err(dev, "rtc only supports 100 years\n");
188 return -EINVAL;
189 }
190
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700191 writeb(bin2bcd(tm->tm_sec), base + S3C2410_RTCSEC);
192 writeb(bin2bcd(tm->tm_min), base + S3C2410_RTCMIN);
193 writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
194 writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
195 writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
196 writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700197 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700198
199 return 0;
200}
201
202static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
203{
204 struct rtc_time *alm_tm = &alrm->time;
Ben Dooks9a654512006-08-27 01:23:22 -0700205 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700206 unsigned int alm_en;
207
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700208 clk_enable(rtc_clk);
Ben Dooks9a654512006-08-27 01:23:22 -0700209 alm_tm->tm_sec = readb(base + S3C2410_ALMSEC);
210 alm_tm->tm_min = readb(base + S3C2410_ALMMIN);
211 alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
212 alm_tm->tm_mon = readb(base + S3C2410_ALMMON);
213 alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
214 alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
Ben Dooks1add6782006-07-01 04:36:26 -0700215
Ben Dooks9a654512006-08-27 01:23:22 -0700216 alm_en = readb(base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700217
David Brownella2db8df2006-12-13 00:35:08 -0800218 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
219
Kukjin Kim30ffc402010-10-27 15:33:09 -0700220 pr_debug("read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
Ben Dooks1add6782006-07-01 04:36:26 -0700221 alm_en,
Kukjin Kim30ffc402010-10-27 15:33:09 -0700222 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
Ben Dooks1add6782006-07-01 04:36:26 -0700223 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
224
225
226 /* decode the alarm enable field */
227
228 if (alm_en & S3C2410_RTCALM_SECEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700229 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
Ben Dooks1add6782006-07-01 04:36:26 -0700230 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700231 alm_tm->tm_sec = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700232
233 if (alm_en & S3C2410_RTCALM_MINEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700234 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
Ben Dooks1add6782006-07-01 04:36:26 -0700235 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700236 alm_tm->tm_min = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700237
238 if (alm_en & S3C2410_RTCALM_HOUREN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700239 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
Ben Dooks1add6782006-07-01 04:36:26 -0700240 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700241 alm_tm->tm_hour = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700242
243 if (alm_en & S3C2410_RTCALM_DAYEN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700244 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
Ben Dooks1add6782006-07-01 04:36:26 -0700245 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700246 alm_tm->tm_mday = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700247
248 if (alm_en & S3C2410_RTCALM_MONEN) {
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700249 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
Ben Dooks1add6782006-07-01 04:36:26 -0700250 alm_tm->tm_mon -= 1;
251 } else {
Changhwan Youndd061d12010-10-27 15:33:08 -0700252 alm_tm->tm_mon = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700253 }
254
255 if (alm_en & S3C2410_RTCALM_YEAREN)
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700256 alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
Ben Dooks1add6782006-07-01 04:36:26 -0700257 else
Changhwan Youndd061d12010-10-27 15:33:08 -0700258 alm_tm->tm_year = -1;
Ben Dooks1add6782006-07-01 04:36:26 -0700259
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700260 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700261 return 0;
262}
263
264static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
265{
266 struct rtc_time *tm = &alrm->time;
Ben Dooks9a654512006-08-27 01:23:22 -0700267 void __iomem *base = s3c_rtc_base;
Ben Dooks1add6782006-07-01 04:36:26 -0700268 unsigned int alrm_en;
269
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700270 clk_enable(rtc_clk);
Kukjin Kim30ffc402010-10-27 15:33:09 -0700271 pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
Ben Dooks1add6782006-07-01 04:36:26 -0700272 alrm->enabled,
MyungJoo Ham4e8896c2011-08-25 15:59:22 -0700273 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
Kukjin Kim30ffc402010-10-27 15:33:09 -0700274 tm->tm_hour, tm->tm_min, tm->tm_sec);
Ben Dooks1add6782006-07-01 04:36:26 -0700275
Ben Dooks9a654512006-08-27 01:23:22 -0700276 alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
277 writeb(0x00, base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700278
279 if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
280 alrm_en |= S3C2410_RTCALM_SECEN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700281 writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
Ben Dooks1add6782006-07-01 04:36:26 -0700282 }
283
284 if (tm->tm_min < 60 && tm->tm_min >= 0) {
285 alrm_en |= S3C2410_RTCALM_MINEN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700286 writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
Ben Dooks1add6782006-07-01 04:36:26 -0700287 }
288
289 if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
290 alrm_en |= S3C2410_RTCALM_HOUREN;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700291 writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
Ben Dooks1add6782006-07-01 04:36:26 -0700292 }
293
294 pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
295
Ben Dooks9a654512006-08-27 01:23:22 -0700296 writeb(alrm_en, base + S3C2410_RTCALM);
Ben Dooks1add6782006-07-01 04:36:26 -0700297
Axel Lin2ec38a02011-03-04 17:36:19 -0800298 s3c_rtc_setaie(dev, alrm->enabled);
Ben Dooks1add6782006-07-01 04:36:26 -0700299
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700300 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700301 return 0;
302}
303
Ben Dooks1add6782006-07-01 04:36:26 -0700304static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
305{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700306 unsigned int ticnt;
Ben Dooks1add6782006-07-01 04:36:26 -0700307
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700308 clk_enable(rtc_clk);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700309 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700310 ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700311 ticnt &= S3C64XX_RTCCON_TICEN;
312 } else {
313 ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
314 ticnt &= S3C2410_TICNT_ENABLE;
315 }
316
317 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700318 clk_disable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700319 return 0;
320}
321
322static int s3c_rtc_open(struct device *dev)
323{
324 struct platform_device *pdev = to_platform_device(dev);
325 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
326 int ret;
327
328 ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
Thomas Gleixner38515e92007-02-14 00:33:16 -0800329 IRQF_DISABLED, "s3c2410-rtc alarm", rtc_dev);
Ben Dooks1add6782006-07-01 04:36:26 -0700330
331 if (ret) {
332 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
333 return ret;
334 }
335
336 ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
Thomas Gleixner38515e92007-02-14 00:33:16 -0800337 IRQF_DISABLED, "s3c2410-rtc tick", rtc_dev);
Ben Dooks1add6782006-07-01 04:36:26 -0700338
339 if (ret) {
340 dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
341 goto tick_err;
342 }
343
344 return ret;
345
346 tick_err:
347 free_irq(s3c_rtc_alarmno, rtc_dev);
348 return ret;
349}
350
351static void s3c_rtc_release(struct device *dev)
352{
353 struct platform_device *pdev = to_platform_device(dev);
354 struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
355
356 /* do not clear AIE here, it may be needed for wake */
357
Ben Dooks1add6782006-07-01 04:36:26 -0700358 free_irq(s3c_rtc_alarmno, rtc_dev);
359 free_irq(s3c_rtc_tickno, rtc_dev);
360}
361
David Brownellff8371a2006-09-30 23:28:17 -0700362static const struct rtc_class_ops s3c_rtcops = {
Ben Dooks1add6782006-07-01 04:36:26 -0700363 .open = s3c_rtc_open,
364 .release = s3c_rtc_release,
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
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700389 if (s3c_rtc_cpu_type == TYPE_S3C2410) {
390 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 clk_put(rtc_clk);
434 rtc_clk = NULL;
435
Ben Dooks1add6782006-07-01 04:36:26 -0700436 iounmap(s3c_rtc_base);
437 release_resource(s3c_rtc_mem);
438 kfree(s3c_rtc_mem);
439
440 return 0;
441}
442
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700443static int __devinit s3c_rtc_probe(struct platform_device *pdev)
Ben Dooks1add6782006-07-01 04:36:26 -0700444{
445 struct rtc_device *rtc;
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
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700450 pr_debug("%s: probe=%p\n", __func__, pdev);
Ben Dooks1add6782006-07-01 04:36:26 -0700451
452 /* find the IRQs */
453
454 s3c_rtc_tickno = platform_get_irq(pdev, 1);
455 if (s3c_rtc_tickno < 0) {
456 dev_err(&pdev->dev, "no irq for rtc tick\n");
457 return -ENOENT;
458 }
459
460 s3c_rtc_alarmno = platform_get_irq(pdev, 0);
461 if (s3c_rtc_alarmno < 0) {
462 dev_err(&pdev->dev, "no irq for alarm\n");
463 return -ENOENT;
464 }
465
466 pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
467 s3c_rtc_tickno, s3c_rtc_alarmno);
468
469 /* get the memory region */
470
471 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
472 if (res == NULL) {
473 dev_err(&pdev->dev, "failed to get memory region resource\n");
474 return -ENOENT;
475 }
476
Joe Perches28f65c112011-06-09 09:13:32 -0700477 s3c_rtc_mem = request_mem_region(res->start, resource_size(res),
Ben Dooks9a654512006-08-27 01:23:22 -0700478 pdev->name);
Ben Dooks1add6782006-07-01 04:36:26 -0700479
480 if (s3c_rtc_mem == NULL) {
481 dev_err(&pdev->dev, "failed to reserve memory region\n");
482 ret = -ENOENT;
483 goto err_nores;
484 }
485
Joe Perches28f65c112011-06-09 09:13:32 -0700486 s3c_rtc_base = ioremap(res->start, resource_size(res));
Ben Dooks1add6782006-07-01 04:36:26 -0700487 if (s3c_rtc_base == NULL) {
488 dev_err(&pdev->dev, "failed ioremap()\n");
489 ret = -EINVAL;
490 goto err_nomap;
491 }
492
Atul Dahiyae48add82010-07-20 12:19:14 +0530493 rtc_clk = clk_get(&pdev->dev, "rtc");
494 if (IS_ERR(rtc_clk)) {
495 dev_err(&pdev->dev, "failed to find rtc clock source\n");
496 ret = PTR_ERR(rtc_clk);
497 rtc_clk = NULL;
498 goto err_clk;
499 }
500
501 clk_enable(rtc_clk);
502
Ben Dooks1add6782006-07-01 04:36:26 -0700503 /* check to see if everything is setup correctly */
504
505 s3c_rtc_enable(pdev, 1);
506
Changhwan Younf61ae672010-10-27 15:33:06 -0700507 pr_debug("s3c2410_rtc: RTCCON=%02x\n",
508 readw(s3c_rtc_base + S3C2410_RTCCON));
Ben Dooks1add6782006-07-01 04:36:26 -0700509
Yauhen Kharuzhy51b76162008-10-29 14:01:16 -0700510 device_init_wakeup(&pdev->dev, 1);
511
Ben Dooks1add6782006-07-01 04:36:26 -0700512 /* register RTC and exit */
513
514 rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
515 THIS_MODULE);
516
517 if (IS_ERR(rtc)) {
518 dev_err(&pdev->dev, "cannot attach rtc\n");
519 ret = PTR_ERR(rtc);
520 goto err_nortc;
521 }
522
Maurus Cuelenaereeaa6e4d2010-06-04 14:14:46 -0700523 s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;
524
Taekgyun Ko051fe542010-07-29 13:00:42 +0900525 /* Check RTC Time */
526
Changhwan Youne1df9622010-10-27 15:33:10 -0700527 s3c_rtc_gettime(NULL, &rtc_tm);
Taekgyun Ko051fe542010-07-29 13:00:42 +0900528
Changhwan Youne1df9622010-10-27 15:33:10 -0700529 if (rtc_valid_tm(&rtc_tm)) {
530 rtc_tm.tm_year = 100;
531 rtc_tm.tm_mon = 0;
532 rtc_tm.tm_mday = 1;
533 rtc_tm.tm_hour = 0;
534 rtc_tm.tm_min = 0;
535 rtc_tm.tm_sec = 0;
536
537 s3c_rtc_settime(NULL, &rtc_tm);
538
539 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
Taekgyun Ko051fe542010-07-29 13:00:42 +0900540 }
541
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700542 if (s3c_rtc_cpu_type == TYPE_S3C64XX)
543 rtc->max_user_freq = 32768;
544 else
545 rtc->max_user_freq = 128;
546
Ben Dooks1add6782006-07-01 04:36:26 -0700547 platform_set_drvdata(pdev, rtc);
Maurus Cuelenaeree893de52010-06-04 14:14:44 -0700548
549 s3c_rtc_setfreq(&pdev->dev, 1);
550
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700551 clk_disable(rtc_clk);
552
Ben Dooks1add6782006-07-01 04:36:26 -0700553 return 0;
554
555 err_nortc:
556 s3c_rtc_enable(pdev, 0);
Atul Dahiyae48add82010-07-20 12:19:14 +0530557 clk_disable(rtc_clk);
558 clk_put(rtc_clk);
559
560 err_clk:
Ben Dooks1add6782006-07-01 04:36:26 -0700561 iounmap(s3c_rtc_base);
562
563 err_nomap:
564 release_resource(s3c_rtc_mem);
565
566 err_nores:
567 return ret;
568}
569
570#ifdef CONFIG_PM
571
572/* RTC Power management control */
573
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700574static int ticnt_save, ticnt_en_save;
Ben Dooks1add6782006-07-01 04:36:26 -0700575
576static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
577{
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700578 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700579 /* save TICNT for anyone using periodic interrupts */
Ben Dooks9a654512006-08-27 01:23:22 -0700580 ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700581 if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700582 ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700583 ticnt_en_save &= S3C64XX_RTCCON_TICEN;
584 }
Ben Dooks1add6782006-07-01 04:36:26 -0700585 s3c_rtc_enable(pdev, 0);
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700586
Ben Dooks52cd4e52011-05-11 15:13:28 -0700587 if (device_may_wakeup(&pdev->dev) && !wake_en) {
588 if (enable_irq_wake(s3c_rtc_alarmno) == 0)
589 wake_en = true;
590 else
591 dev_err(&pdev->dev, "enable_irq_wake failed\n");
592 }
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700593 clk_disable(rtc_clk);
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700594
Ben Dooks1add6782006-07-01 04:36:26 -0700595 return 0;
596}
597
598static int s3c_rtc_resume(struct platform_device *pdev)
599{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700600 unsigned int tmp;
601
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700602 clk_enable(rtc_clk);
Ben Dooks1add6782006-07-01 04:36:26 -0700603 s3c_rtc_enable(pdev, 1);
Ben Dooks9a654512006-08-27 01:23:22 -0700604 writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700605 if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
Changhwan Younf61ae672010-10-27 15:33:06 -0700606 tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
607 writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700608 }
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700609
Ben Dooks52cd4e52011-05-11 15:13:28 -0700610 if (device_may_wakeup(&pdev->dev) && wake_en) {
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700611 disable_irq_wake(s3c_rtc_alarmno);
Ben Dooks52cd4e52011-05-11 15:13:28 -0700612 wake_en = false;
613 }
Donggeun Kimcefe4fb2011-07-25 17:13:32 -0700614 clk_disable(rtc_clk);
Vladimir Zapolskiyf501ed52010-09-22 13:05:13 -0700615
Ben Dooks1add6782006-07-01 04:36:26 -0700616 return 0;
617}
618#else
619#define s3c_rtc_suspend NULL
620#define s3c_rtc_resume NULL
621#endif
622
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700623static struct platform_device_id s3c_rtc_driver_ids[] = {
624 {
625 .name = "s3c2410-rtc",
626 .driver_data = TYPE_S3C2410,
627 }, {
628 .name = "s3c64xx-rtc",
629 .driver_data = TYPE_S3C64XX,
630 },
631 { }
632};
633
634MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
635
636static struct platform_driver s3c_rtc_driver = {
Ben Dooks1add6782006-07-01 04:36:26 -0700637 .probe = s3c_rtc_probe,
Ben Dooks4cd0c5c2008-07-23 21:30:44 -0700638 .remove = __devexit_p(s3c_rtc_remove),
Ben Dooks1add6782006-07-01 04:36:26 -0700639 .suspend = s3c_rtc_suspend,
640 .resume = s3c_rtc_resume,
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700641 .id_table = s3c_rtc_driver_ids,
Ben Dooks1add6782006-07-01 04:36:26 -0700642 .driver = {
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700643 .name = "s3c-rtc",
Ben Dooks1add6782006-07-01 04:36:26 -0700644 .owner = THIS_MODULE,
645 },
646};
647
648static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
649
650static int __init s3c_rtc_init(void)
651{
652 printk(banner);
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700653 return platform_driver_register(&s3c_rtc_driver);
Ben Dooks1add6782006-07-01 04:36:26 -0700654}
655
656static void __exit s3c_rtc_exit(void)
657{
Maurus Cuelenaere9f4123b2010-05-24 14:33:43 -0700658 platform_driver_unregister(&s3c_rtc_driver);
Ben Dooks1add6782006-07-01 04:36:26 -0700659}
660
661module_init(s3c_rtc_init);
662module_exit(s3c_rtc_exit);
663
664MODULE_DESCRIPTION("Samsung S3C RTC Driver");
665MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
666MODULE_LICENSE("GPL");
Kay Sieversad28a072008-04-10 21:29:25 -0700667MODULE_ALIAS("platform:s3c2410-rtc");