blob: 7415c2b4d6e8e5988baf6fcdcec198ba7a25c387 [file] [log] [blame]
Andrew Sharp8f267952008-02-06 01:38:46 -08001/*
2 * An rtc driver for the Dallas DS1511
3 *
4 * Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Andrew Sharp5b73a412009-09-23 16:03:20 -07005 * Copyright (C) 2007 Andrew Sharp <andy.sharp@lsi.com>
Andrew Sharp8f267952008-02-06 01:38:46 -08006 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * Real time clock driver for the Dallas 1511 chip, which also
12 * contains a watchdog timer. There is a tiny amount of code that
13 * platform code could use to mess with the watchdog device a little
14 * bit, but not a full watchdog driver.
15 */
16
17#include <linux/bcd.h>
18#include <linux/init.h>
19#include <linux/kernel.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/gfp.h>
Andrew Sharp8f267952008-02-06 01:38:46 -080021#include <linux/delay.h>
22#include <linux/interrupt.h>
23#include <linux/rtc.h>
24#include <linux/platform_device.h>
25#include <linux/io.h>
Paul Gortmaker21138522011-05-27 09:57:25 -040026#include <linux/module.h>
Andrew Sharp8f267952008-02-06 01:38:46 -080027
28#define DRV_VERSION "0.6"
29
30enum ds1511reg {
31 DS1511_SEC = 0x0,
32 DS1511_MIN = 0x1,
33 DS1511_HOUR = 0x2,
34 DS1511_DOW = 0x3,
35 DS1511_DOM = 0x4,
36 DS1511_MONTH = 0x5,
37 DS1511_YEAR = 0x6,
38 DS1511_CENTURY = 0x7,
39 DS1511_AM1_SEC = 0x8,
40 DS1511_AM2_MIN = 0x9,
41 DS1511_AM3_HOUR = 0xa,
42 DS1511_AM4_DATE = 0xb,
43 DS1511_WD_MSEC = 0xc,
44 DS1511_WD_SEC = 0xd,
45 DS1511_CONTROL_A = 0xe,
46 DS1511_CONTROL_B = 0xf,
47 DS1511_RAMADDR_LSB = 0x10,
48 DS1511_RAMDATA = 0x13
49};
50
51#define DS1511_BLF1 0x80
52#define DS1511_BLF2 0x40
53#define DS1511_PRS 0x20
54#define DS1511_PAB 0x10
55#define DS1511_TDF 0x08
56#define DS1511_KSF 0x04
57#define DS1511_WDF 0x02
58#define DS1511_IRQF 0x01
59#define DS1511_TE 0x80
60#define DS1511_CS 0x40
61#define DS1511_BME 0x20
62#define DS1511_TPE 0x10
63#define DS1511_TIE 0x08
64#define DS1511_KIE 0x04
65#define DS1511_WDE 0x02
66#define DS1511_WDS 0x01
67#define DS1511_RAM_MAX 0xff
68
69#define RTC_CMD DS1511_CONTROL_B
70#define RTC_CMD1 DS1511_CONTROL_A
71
72#define RTC_ALARM_SEC DS1511_AM1_SEC
73#define RTC_ALARM_MIN DS1511_AM2_MIN
74#define RTC_ALARM_HOUR DS1511_AM3_HOUR
75#define RTC_ALARM_DATE DS1511_AM4_DATE
76
77#define RTC_SEC DS1511_SEC
78#define RTC_MIN DS1511_MIN
79#define RTC_HOUR DS1511_HOUR
80#define RTC_DOW DS1511_DOW
81#define RTC_DOM DS1511_DOM
82#define RTC_MON DS1511_MONTH
83#define RTC_YEAR DS1511_YEAR
84#define RTC_CENTURY DS1511_CENTURY
85
86#define RTC_TIE DS1511_TIE
87#define RTC_TE DS1511_TE
88
89struct rtc_plat_data {
90 struct rtc_device *rtc;
91 void __iomem *ioaddr; /* virtual base address */
Andrew Sharp8f267952008-02-06 01:38:46 -080092 int irq;
93 unsigned int irqen;
94 int alrm_sec;
95 int alrm_min;
96 int alrm_hour;
97 int alrm_mday;
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -080098 spinlock_t lock;
Andrew Sharp8f267952008-02-06 01:38:46 -080099};
100
101static DEFINE_SPINLOCK(ds1511_lock);
102
103static __iomem char *ds1511_base;
104static u32 reg_spacing = 1;
105
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700106static noinline void
Andrew Sharp8f267952008-02-06 01:38:46 -0800107rtc_write(uint8_t val, uint32_t reg)
108{
109 writeb(val, ds1511_base + (reg * reg_spacing));
110}
111
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700112static inline void
Andrew Sharp8f267952008-02-06 01:38:46 -0800113rtc_write_alarm(uint8_t val, enum ds1511reg reg)
114{
115 rtc_write((val | 0x80), reg);
116}
117
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700118static noinline uint8_t
Andrew Sharp8f267952008-02-06 01:38:46 -0800119rtc_read(enum ds1511reg reg)
120{
121 return readb(ds1511_base + (reg * reg_spacing));
122}
123
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700124static inline void
Andrew Sharp8f267952008-02-06 01:38:46 -0800125rtc_disable_update(void)
126{
127 rtc_write((rtc_read(RTC_CMD) & ~RTC_TE), RTC_CMD);
128}
129
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700130static void
Andrew Sharp8f267952008-02-06 01:38:46 -0800131rtc_enable_update(void)
132{
133 rtc_write((rtc_read(RTC_CMD) | RTC_TE), RTC_CMD);
134}
135
136/*
137 * #define DS1511_WDOG_RESET_SUPPORT
138 *
139 * Uncomment this if you want to use these routines in
140 * some platform code.
141 */
142#ifdef DS1511_WDOG_RESET_SUPPORT
143/*
144 * just enough code to set the watchdog timer so that it
145 * will reboot the system
146 */
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700147void
Andrew Sharp8f267952008-02-06 01:38:46 -0800148ds1511_wdog_set(unsigned long deciseconds)
149{
150 /*
151 * the wdog timer can take 99.99 seconds
152 */
153 deciseconds %= 10000;
154 /*
155 * set the wdog values in the wdog registers
156 */
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700157 rtc_write(bin2bcd(deciseconds % 100), DS1511_WD_MSEC);
158 rtc_write(bin2bcd(deciseconds / 100), DS1511_WD_SEC);
Andrew Sharp8f267952008-02-06 01:38:46 -0800159 /*
160 * set wdog enable and wdog 'steering' bit to issue a reset
161 */
162 rtc_write(DS1511_WDE | DS1511_WDS, RTC_CMD);
163}
164
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700165void
Andrew Sharp8f267952008-02-06 01:38:46 -0800166ds1511_wdog_disable(void)
167{
168 /*
169 * clear wdog enable and wdog 'steering' bits
170 */
171 rtc_write(rtc_read(RTC_CMD) & ~(DS1511_WDE | DS1511_WDS), RTC_CMD);
172 /*
173 * clear the wdog counter
174 */
175 rtc_write(0, DS1511_WD_MSEC);
176 rtc_write(0, DS1511_WD_SEC);
177}
178#endif
179
180/*
181 * set the rtc chip's idea of the time.
182 * stupidly, some callers call with year unmolested;
183 * and some call with year = year - 1900. thanks.
184 */
Adrian Bunka3ed1072008-04-28 02:11:55 -0700185static int ds1511_rtc_set_time(struct device *dev, struct rtc_time *rtc_tm)
Andrew Sharp8f267952008-02-06 01:38:46 -0800186{
187 u8 mon, day, dow, hrs, min, sec, yrs, cen;
Steven Rostedt9a0f4ae2008-05-06 20:42:30 -0700188 unsigned long flags;
Andrew Sharp8f267952008-02-06 01:38:46 -0800189
190 /*
191 * won't have to change this for a while
192 */
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700193 if (rtc_tm->tm_year < 1900)
Andrew Sharp8f267952008-02-06 01:38:46 -0800194 rtc_tm->tm_year += 1900;
Andrew Sharp8f267952008-02-06 01:38:46 -0800195
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700196 if (rtc_tm->tm_year < 1970)
Andrew Sharp8f267952008-02-06 01:38:46 -0800197 return -EINVAL;
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700198
Andrew Sharp8f267952008-02-06 01:38:46 -0800199 yrs = rtc_tm->tm_year % 100;
200 cen = rtc_tm->tm_year / 100;
201 mon = rtc_tm->tm_mon + 1; /* tm_mon starts at zero */
202 day = rtc_tm->tm_mday;
203 dow = rtc_tm->tm_wday & 0x7; /* automatic BCD */
204 hrs = rtc_tm->tm_hour;
205 min = rtc_tm->tm_min;
206 sec = rtc_tm->tm_sec;
207
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700208 if ((mon > 12) || (day == 0))
Andrew Sharp8f267952008-02-06 01:38:46 -0800209 return -EINVAL;
Andrew Sharp8f267952008-02-06 01:38:46 -0800210
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700211 if (day > rtc_month_days(rtc_tm->tm_mon, rtc_tm->tm_year))
Andrew Sharp8f267952008-02-06 01:38:46 -0800212 return -EINVAL;
Andrew Sharp8f267952008-02-06 01:38:46 -0800213
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700214 if ((hrs >= 24) || (min >= 60) || (sec >= 60))
Andrew Sharp8f267952008-02-06 01:38:46 -0800215 return -EINVAL;
Andrew Sharp8f267952008-02-06 01:38:46 -0800216
217 /*
218 * each register is a different number of valid bits
219 */
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700220 sec = bin2bcd(sec) & 0x7f;
221 min = bin2bcd(min) & 0x7f;
222 hrs = bin2bcd(hrs) & 0x3f;
223 day = bin2bcd(day) & 0x3f;
224 mon = bin2bcd(mon) & 0x1f;
225 yrs = bin2bcd(yrs) & 0xff;
226 cen = bin2bcd(cen) & 0xff;
Andrew Sharp8f267952008-02-06 01:38:46 -0800227
228 spin_lock_irqsave(&ds1511_lock, flags);
229 rtc_disable_update();
230 rtc_write(cen, RTC_CENTURY);
231 rtc_write(yrs, RTC_YEAR);
232 rtc_write((rtc_read(RTC_MON) & 0xe0) | mon, RTC_MON);
233 rtc_write(day, RTC_DOM);
234 rtc_write(hrs, RTC_HOUR);
235 rtc_write(min, RTC_MIN);
236 rtc_write(sec, RTC_SEC);
237 rtc_write(dow, RTC_DOW);
238 rtc_enable_update();
239 spin_unlock_irqrestore(&ds1511_lock, flags);
240
241 return 0;
242}
243
Adrian Bunka3ed1072008-04-28 02:11:55 -0700244static int ds1511_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
Andrew Sharp8f267952008-02-06 01:38:46 -0800245{
246 unsigned int century;
Steven Rostedt9a0f4ae2008-05-06 20:42:30 -0700247 unsigned long flags;
Andrew Sharp8f267952008-02-06 01:38:46 -0800248
249 spin_lock_irqsave(&ds1511_lock, flags);
250 rtc_disable_update();
251
252 rtc_tm->tm_sec = rtc_read(RTC_SEC) & 0x7f;
253 rtc_tm->tm_min = rtc_read(RTC_MIN) & 0x7f;
254 rtc_tm->tm_hour = rtc_read(RTC_HOUR) & 0x3f;
255 rtc_tm->tm_mday = rtc_read(RTC_DOM) & 0x3f;
256 rtc_tm->tm_wday = rtc_read(RTC_DOW) & 0x7;
257 rtc_tm->tm_mon = rtc_read(RTC_MON) & 0x1f;
258 rtc_tm->tm_year = rtc_read(RTC_YEAR) & 0x7f;
259 century = rtc_read(RTC_CENTURY);
260
261 rtc_enable_update();
262 spin_unlock_irqrestore(&ds1511_lock, flags);
263
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700264 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
265 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
266 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
267 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
268 rtc_tm->tm_wday = bcd2bin(rtc_tm->tm_wday);
269 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
270 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
271 century = bcd2bin(century) * 100;
Andrew Sharp8f267952008-02-06 01:38:46 -0800272
273 /*
274 * Account for differences between how the RTC uses the values
275 * and how they are defined in a struct rtc_time;
276 */
277 century += rtc_tm->tm_year;
278 rtc_tm->tm_year = century - 1900;
279
280 rtc_tm->tm_mon--;
281
282 if (rtc_valid_tm(rtc_tm) < 0) {
283 dev_err(dev, "retrieved date/time is not valid.\n");
284 rtc_time_to_tm(0, rtc_tm);
285 }
286 return 0;
287}
288
289/*
290 * write the alarm register settings
291 *
292 * we only have the use to interrupt every second, otherwise
293 * known as the update interrupt, or the interrupt if the whole
294 * date/hours/mins/secs matches. the ds1511 has many more
295 * permutations, but the kernel doesn't.
296 */
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700297static void
Andrew Sharp8f267952008-02-06 01:38:46 -0800298ds1511_rtc_update_alarm(struct rtc_plat_data *pdata)
299{
300 unsigned long flags;
301
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800302 spin_lock_irqsave(&pdata->lock, flags);
Andrew Sharp8f267952008-02-06 01:38:46 -0800303 rtc_write(pdata->alrm_mday < 0 || (pdata->irqen & RTC_UF) ?
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700304 0x80 : bin2bcd(pdata->alrm_mday) & 0x3f,
Andrew Sharp8f267952008-02-06 01:38:46 -0800305 RTC_ALARM_DATE);
306 rtc_write(pdata->alrm_hour < 0 || (pdata->irqen & RTC_UF) ?
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700307 0x80 : bin2bcd(pdata->alrm_hour) & 0x3f,
Andrew Sharp8f267952008-02-06 01:38:46 -0800308 RTC_ALARM_HOUR);
309 rtc_write(pdata->alrm_min < 0 || (pdata->irqen & RTC_UF) ?
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700310 0x80 : bin2bcd(pdata->alrm_min) & 0x7f,
Andrew Sharp8f267952008-02-06 01:38:46 -0800311 RTC_ALARM_MIN);
312 rtc_write(pdata->alrm_sec < 0 || (pdata->irqen & RTC_UF) ?
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700313 0x80 : bin2bcd(pdata->alrm_sec) & 0x7f,
Andrew Sharp8f267952008-02-06 01:38:46 -0800314 RTC_ALARM_SEC);
315 rtc_write(rtc_read(RTC_CMD) | (pdata->irqen ? RTC_TIE : 0), RTC_CMD);
316 rtc_read(RTC_CMD1); /* clear interrupts */
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800317 spin_unlock_irqrestore(&pdata->lock, flags);
Andrew Sharp8f267952008-02-06 01:38:46 -0800318}
319
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700320static int
Andrew Sharp8f267952008-02-06 01:38:46 -0800321ds1511_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
322{
323 struct platform_device *pdev = to_platform_device(dev);
324 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
325
Anton Vorontsov2fac6672009-01-06 14:42:11 -0800326 if (pdata->irq <= 0)
Andrew Sharp8f267952008-02-06 01:38:46 -0800327 return -EINVAL;
Anton Vorontsov2fac6672009-01-06 14:42:11 -0800328
Andrew Sharp8f267952008-02-06 01:38:46 -0800329 pdata->alrm_mday = alrm->time.tm_mday;
330 pdata->alrm_hour = alrm->time.tm_hour;
331 pdata->alrm_min = alrm->time.tm_min;
332 pdata->alrm_sec = alrm->time.tm_sec;
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700333 if (alrm->enabled)
Andrew Sharp8f267952008-02-06 01:38:46 -0800334 pdata->irqen |= RTC_AF;
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700335
Andrew Sharp8f267952008-02-06 01:38:46 -0800336 ds1511_rtc_update_alarm(pdata);
337 return 0;
338}
339
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700340static int
Andrew Sharp8f267952008-02-06 01:38:46 -0800341ds1511_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
342{
343 struct platform_device *pdev = to_platform_device(dev);
344 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
345
Anton Vorontsov2fac6672009-01-06 14:42:11 -0800346 if (pdata->irq <= 0)
Andrew Sharp8f267952008-02-06 01:38:46 -0800347 return -EINVAL;
Anton Vorontsov2fac6672009-01-06 14:42:11 -0800348
Andrew Sharp8f267952008-02-06 01:38:46 -0800349 alrm->time.tm_mday = pdata->alrm_mday < 0 ? 0 : pdata->alrm_mday;
350 alrm->time.tm_hour = pdata->alrm_hour < 0 ? 0 : pdata->alrm_hour;
351 alrm->time.tm_min = pdata->alrm_min < 0 ? 0 : pdata->alrm_min;
352 alrm->time.tm_sec = pdata->alrm_sec < 0 ? 0 : pdata->alrm_sec;
353 alrm->enabled = (pdata->irqen & RTC_AF) ? 1 : 0;
354 return 0;
355}
356
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700357static irqreturn_t
Andrew Sharp8f267952008-02-06 01:38:46 -0800358ds1511_interrupt(int irq, void *dev_id)
359{
360 struct platform_device *pdev = dev_id;
361 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800362 unsigned long events = 0;
Andrew Sharp8f267952008-02-06 01:38:46 -0800363
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800364 spin_lock(&pdata->lock);
Andrew Sharp8f267952008-02-06 01:38:46 -0800365 /*
366 * read and clear interrupt
367 */
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800368 if (rtc_read(RTC_CMD1) & DS1511_IRQF) {
369 events = RTC_IRQF;
370 if (rtc_read(RTC_ALARM_SEC) & 0x80)
371 events |= RTC_UF;
372 else
373 events |= RTC_AF;
Alexander Shiyan0d719152014-04-03 14:50:20 -0700374 rtc_update_irq(pdata->rtc, 1, events);
Andrew Sharp8f267952008-02-06 01:38:46 -0800375 }
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800376 spin_unlock(&pdata->lock);
377 return events ? IRQ_HANDLED : IRQ_NONE;
Andrew Sharp8f267952008-02-06 01:38:46 -0800378}
379
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800380static int ds1511_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
Andrew Sharp8f267952008-02-06 01:38:46 -0800381{
382 struct platform_device *pdev = to_platform_device(dev);
383 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
384
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800385 if (pdata->irq <= 0)
386 return -EINVAL;
387 if (enabled)
Andrew Sharp8f267952008-02-06 01:38:46 -0800388 pdata->irqen |= RTC_AF;
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800389 else
390 pdata->irqen &= ~RTC_AF;
391 ds1511_rtc_update_alarm(pdata);
392 return 0;
393}
394
Andrew Sharp8f267952008-02-06 01:38:46 -0800395static const struct rtc_class_ops ds1511_rtc_ops = {
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800396 .read_time = ds1511_rtc_read_time,
397 .set_time = ds1511_rtc_set_time,
398 .read_alarm = ds1511_rtc_read_alarm,
399 .set_alarm = ds1511_rtc_set_alarm,
400 .alarm_irq_enable = ds1511_rtc_alarm_irq_enable,
Andrew Sharp8f267952008-02-06 01:38:46 -0800401};
402
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700403static ssize_t
Chris Wright2c3c8be2010-05-12 18:28:57 -0700404ds1511_nvram_read(struct file *filp, struct kobject *kobj,
405 struct bin_attribute *ba,
406 char *buf, loff_t pos, size_t size)
Andrew Sharp8f267952008-02-06 01:38:46 -0800407{
408 ssize_t count;
409
410 /*
411 * if count is more than one, turn on "burst" mode
412 * turn it off when you're done
413 */
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700414 if (size > 1)
Andrew Sharp8f267952008-02-06 01:38:46 -0800415 rtc_write((rtc_read(RTC_CMD) | DS1511_BME), RTC_CMD);
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700416
417 if (pos > DS1511_RAM_MAX)
Andrew Sharp8f267952008-02-06 01:38:46 -0800418 pos = DS1511_RAM_MAX;
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700419
420 if (size + pos > DS1511_RAM_MAX + 1)
Andrew Sharp8f267952008-02-06 01:38:46 -0800421 size = DS1511_RAM_MAX - pos + 1;
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700422
Andrew Sharp8f267952008-02-06 01:38:46 -0800423 rtc_write(pos, DS1511_RAMADDR_LSB);
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700424 for (count = 0; size > 0; count++, size--)
Andrew Sharp8f267952008-02-06 01:38:46 -0800425 *buf++ = rtc_read(DS1511_RAMDATA);
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700426
427 if (count > 1)
Andrew Sharp8f267952008-02-06 01:38:46 -0800428 rtc_write((rtc_read(RTC_CMD) & ~DS1511_BME), RTC_CMD);
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700429
Andrew Sharp8f267952008-02-06 01:38:46 -0800430 return count;
431}
432
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700433static ssize_t
Chris Wright2c3c8be2010-05-12 18:28:57 -0700434ds1511_nvram_write(struct file *filp, struct kobject *kobj,
435 struct bin_attribute *bin_attr,
436 char *buf, loff_t pos, size_t size)
Andrew Sharp8f267952008-02-06 01:38:46 -0800437{
438 ssize_t count;
439
440 /*
441 * if count is more than one, turn on "burst" mode
442 * turn it off when you're done
443 */
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700444 if (size > 1)
Andrew Sharp8f267952008-02-06 01:38:46 -0800445 rtc_write((rtc_read(RTC_CMD) | DS1511_BME), RTC_CMD);
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700446
447 if (pos > DS1511_RAM_MAX)
Andrew Sharp8f267952008-02-06 01:38:46 -0800448 pos = DS1511_RAM_MAX;
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700449
450 if (size + pos > DS1511_RAM_MAX + 1)
Andrew Sharp8f267952008-02-06 01:38:46 -0800451 size = DS1511_RAM_MAX - pos + 1;
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700452
Andrew Sharp8f267952008-02-06 01:38:46 -0800453 rtc_write(pos, DS1511_RAMADDR_LSB);
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700454 for (count = 0; size > 0; count++, size--)
Andrew Sharp8f267952008-02-06 01:38:46 -0800455 rtc_write(*buf++, DS1511_RAMDATA);
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700456
457 if (count > 1)
Andrew Sharp8f267952008-02-06 01:38:46 -0800458 rtc_write((rtc_read(RTC_CMD) & ~DS1511_BME), RTC_CMD);
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700459
Andrew Sharp8f267952008-02-06 01:38:46 -0800460 return count;
461}
462
463static struct bin_attribute ds1511_nvram_attr = {
464 .attr = {
465 .name = "nvram",
Vasiliy Kulikov49d50fb2011-03-22 16:34:53 -0700466 .mode = S_IRUGO | S_IWUSR,
Andrew Sharp8f267952008-02-06 01:38:46 -0800467 },
468 .size = DS1511_RAM_MAX,
469 .read = ds1511_nvram_read,
470 .write = ds1511_nvram_write,
471};
472
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800473static int ds1511_rtc_probe(struct platform_device *pdev)
Andrew Sharp8f267952008-02-06 01:38:46 -0800474{
Andrew Sharp8f267952008-02-06 01:38:46 -0800475 struct resource *res;
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800476 struct rtc_plat_data *pdata;
Andrew Sharp8f267952008-02-06 01:38:46 -0800477 int ret = 0;
478
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800479 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
480 if (!pdata)
Andrew Sharp8f267952008-02-06 01:38:46 -0800481 return -ENOMEM;
Julia Lawall7c1d69e2013-09-11 14:24:27 -0700482
483 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
484 ds1511_base = devm_ioremap_resource(&pdev->dev, res);
485 if (IS_ERR(ds1511_base))
486 return PTR_ERR(ds1511_base);
Andrew Sharp8f267952008-02-06 01:38:46 -0800487 pdata->ioaddr = ds1511_base;
488 pdata->irq = platform_get_irq(pdev, 0);
489
490 /*
491 * turn on the clock and the crystal, etc.
492 */
493 rtc_write(0, RTC_CMD);
494 rtc_write(0, RTC_CMD1);
495 /*
496 * clear the wdog counter
497 */
498 rtc_write(0, DS1511_WD_MSEC);
499 rtc_write(0, DS1511_WD_SEC);
500 /*
501 * start the clock
502 */
503 rtc_enable_update();
504
505 /*
506 * check for a dying bat-tree
507 */
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700508 if (rtc_read(RTC_CMD1) & DS1511_BLF1)
Andrew Sharp8f267952008-02-06 01:38:46 -0800509 dev_warn(&pdev->dev, "voltage-low detected.\n");
Andrew Sharp8f267952008-02-06 01:38:46 -0800510
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800511 spin_lock_init(&pdata->lock);
512 platform_set_drvdata(pdev, pdata);
Alessandro Zummo4071ea22014-04-03 14:49:36 -0700513
514 pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
515 &ds1511_rtc_ops, THIS_MODULE);
516 if (IS_ERR(pdata->rtc))
517 return PTR_ERR(pdata->rtc);
518
Andrew Sharp8f267952008-02-06 01:38:46 -0800519 /*
520 * if the platform has an interrupt in mind for this device,
521 * then by all means, set it
522 */
Anton Vorontsov2fac6672009-01-06 14:42:11 -0800523 if (pdata->irq > 0) {
Andrew Sharp8f267952008-02-06 01:38:46 -0800524 rtc_read(RTC_CMD1);
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800525 if (devm_request_irq(&pdev->dev, pdata->irq, ds1511_interrupt,
Yong Zhang2f6e5f92012-03-23 15:02:34 -0700526 IRQF_SHARED, pdev->name, pdev) < 0) {
Andrew Sharp8f267952008-02-06 01:38:46 -0800527
528 dev_warn(&pdev->dev, "interrupt not available.\n");
Anton Vorontsov2fac6672009-01-06 14:42:11 -0800529 pdata->irq = 0;
Andrew Sharp8f267952008-02-06 01:38:46 -0800530 }
531 }
532
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800533 ret = sysfs_create_bin_file(&pdev->dev.kobj, &ds1511_nvram_attr);
Alessandro Zummo4071ea22014-04-03 14:49:36 -0700534 if (ret)
535 dev_err(&pdev->dev, "Unable to create sysfs entry: %s\n",
536 ds1511_nvram_attr.attr.name);
Jingoo Hanf650e652013-04-29 16:18:59 -0700537
Alessandro Zummo4071ea22014-04-03 14:49:36 -0700538 return 0;
Andrew Sharp8f267952008-02-06 01:38:46 -0800539}
540
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800541static int ds1511_rtc_remove(struct platform_device *pdev)
Andrew Sharp8f267952008-02-06 01:38:46 -0800542{
543 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
544
545 sysfs_remove_bin_file(&pdev->dev.kobj, &ds1511_nvram_attr);
Anton Vorontsov2fac6672009-01-06 14:42:11 -0800546 if (pdata->irq > 0) {
Andrew Sharp8f267952008-02-06 01:38:46 -0800547 /*
548 * disable the alarm interrupt
549 */
550 rtc_write(rtc_read(RTC_CMD) & ~RTC_TIE, RTC_CMD);
551 rtc_read(RTC_CMD1);
Andrew Sharp8f267952008-02-06 01:38:46 -0800552 }
Andrew Sharp8f267952008-02-06 01:38:46 -0800553 return 0;
554}
555
Kay Sieversad28a072008-04-10 21:29:25 -0700556/* work with hotplug and coldplug */
557MODULE_ALIAS("platform:ds1511");
558
Andrew Sharp8f267952008-02-06 01:38:46 -0800559static struct platform_driver ds1511_rtc_driver = {
560 .probe = ds1511_rtc_probe,
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800561 .remove = ds1511_rtc_remove,
Andrew Sharp8f267952008-02-06 01:38:46 -0800562 .driver = {
563 .name = "ds1511",
Andrew Sharp8f267952008-02-06 01:38:46 -0800564 },
565};
566
Axel Lin0c4eae62012-01-10 15:10:48 -0800567module_platform_driver(ds1511_rtc_driver);
Andrew Sharp8f267952008-02-06 01:38:46 -0800568
Andrew Sharp5b73a412009-09-23 16:03:20 -0700569MODULE_AUTHOR("Andrew Sharp <andy.sharp@lsi.com>");
Andrew Sharp8f267952008-02-06 01:38:46 -0800570MODULE_DESCRIPTION("Dallas DS1511 RTC driver");
571MODULE_LICENSE("GPL");
572MODULE_VERSION(DRV_VERSION);