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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 size; /* amount of memory mapped */
93 int irq;
94 unsigned int irqen;
95 int alrm_sec;
96 int alrm_min;
97 int alrm_hour;
98 int alrm_mday;
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -080099 spinlock_t lock;
Andrew Sharp8f267952008-02-06 01:38:46 -0800100};
101
102static DEFINE_SPINLOCK(ds1511_lock);
103
104static __iomem char *ds1511_base;
105static u32 reg_spacing = 1;
106
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700107static noinline void
Andrew Sharp8f267952008-02-06 01:38:46 -0800108rtc_write(uint8_t val, uint32_t reg)
109{
110 writeb(val, ds1511_base + (reg * reg_spacing));
111}
112
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700113static inline void
Andrew Sharp8f267952008-02-06 01:38:46 -0800114rtc_write_alarm(uint8_t val, enum ds1511reg reg)
115{
116 rtc_write((val | 0x80), reg);
117}
118
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700119static noinline uint8_t
Andrew Sharp8f267952008-02-06 01:38:46 -0800120rtc_read(enum ds1511reg reg)
121{
122 return readb(ds1511_base + (reg * reg_spacing));
123}
124
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700125static inline void
Andrew Sharp8f267952008-02-06 01:38:46 -0800126rtc_disable_update(void)
127{
128 rtc_write((rtc_read(RTC_CMD) & ~RTC_TE), RTC_CMD);
129}
130
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700131static void
Andrew Sharp8f267952008-02-06 01:38:46 -0800132rtc_enable_update(void)
133{
134 rtc_write((rtc_read(RTC_CMD) | RTC_TE), RTC_CMD);
135}
136
137/*
138 * #define DS1511_WDOG_RESET_SUPPORT
139 *
140 * Uncomment this if you want to use these routines in
141 * some platform code.
142 */
143#ifdef DS1511_WDOG_RESET_SUPPORT
144/*
145 * just enough code to set the watchdog timer so that it
146 * will reboot the system
147 */
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700148void
Andrew Sharp8f267952008-02-06 01:38:46 -0800149ds1511_wdog_set(unsigned long deciseconds)
150{
151 /*
152 * the wdog timer can take 99.99 seconds
153 */
154 deciseconds %= 10000;
155 /*
156 * set the wdog values in the wdog registers
157 */
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700158 rtc_write(bin2bcd(deciseconds % 100), DS1511_WD_MSEC);
159 rtc_write(bin2bcd(deciseconds / 100), DS1511_WD_SEC);
Andrew Sharp8f267952008-02-06 01:38:46 -0800160 /*
161 * set wdog enable and wdog 'steering' bit to issue a reset
162 */
163 rtc_write(DS1511_WDE | DS1511_WDS, RTC_CMD);
164}
165
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700166void
Andrew Sharp8f267952008-02-06 01:38:46 -0800167ds1511_wdog_disable(void)
168{
169 /*
170 * clear wdog enable and wdog 'steering' bits
171 */
172 rtc_write(rtc_read(RTC_CMD) & ~(DS1511_WDE | DS1511_WDS), RTC_CMD);
173 /*
174 * clear the wdog counter
175 */
176 rtc_write(0, DS1511_WD_MSEC);
177 rtc_write(0, DS1511_WD_SEC);
178}
179#endif
180
181/*
182 * set the rtc chip's idea of the time.
183 * stupidly, some callers call with year unmolested;
184 * and some call with year = year - 1900. thanks.
185 */
Adrian Bunka3ed1072008-04-28 02:11:55 -0700186static int ds1511_rtc_set_time(struct device *dev, struct rtc_time *rtc_tm)
Andrew Sharp8f267952008-02-06 01:38:46 -0800187{
188 u8 mon, day, dow, hrs, min, sec, yrs, cen;
Steven Rostedt9a0f4ae2008-05-06 20:42:30 -0700189 unsigned long flags;
Andrew Sharp8f267952008-02-06 01:38:46 -0800190
191 /*
192 * won't have to change this for a while
193 */
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700194 if (rtc_tm->tm_year < 1900)
Andrew Sharp8f267952008-02-06 01:38:46 -0800195 rtc_tm->tm_year += 1900;
Andrew Sharp8f267952008-02-06 01:38:46 -0800196
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700197 if (rtc_tm->tm_year < 1970)
Andrew Sharp8f267952008-02-06 01:38:46 -0800198 return -EINVAL;
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700199
Andrew Sharp8f267952008-02-06 01:38:46 -0800200 yrs = rtc_tm->tm_year % 100;
201 cen = rtc_tm->tm_year / 100;
202 mon = rtc_tm->tm_mon + 1; /* tm_mon starts at zero */
203 day = rtc_tm->tm_mday;
204 dow = rtc_tm->tm_wday & 0x7; /* automatic BCD */
205 hrs = rtc_tm->tm_hour;
206 min = rtc_tm->tm_min;
207 sec = rtc_tm->tm_sec;
208
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700209 if ((mon > 12) || (day == 0))
Andrew Sharp8f267952008-02-06 01:38:46 -0800210 return -EINVAL;
Andrew Sharp8f267952008-02-06 01:38:46 -0800211
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700212 if (day > rtc_month_days(rtc_tm->tm_mon, rtc_tm->tm_year))
Andrew Sharp8f267952008-02-06 01:38:46 -0800213 return -EINVAL;
Andrew Sharp8f267952008-02-06 01:38:46 -0800214
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700215 if ((hrs >= 24) || (min >= 60) || (sec >= 60))
Andrew Sharp8f267952008-02-06 01:38:46 -0800216 return -EINVAL;
Andrew Sharp8f267952008-02-06 01:38:46 -0800217
218 /*
219 * each register is a different number of valid bits
220 */
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700221 sec = bin2bcd(sec) & 0x7f;
222 min = bin2bcd(min) & 0x7f;
223 hrs = bin2bcd(hrs) & 0x3f;
224 day = bin2bcd(day) & 0x3f;
225 mon = bin2bcd(mon) & 0x1f;
226 yrs = bin2bcd(yrs) & 0xff;
227 cen = bin2bcd(cen) & 0xff;
Andrew Sharp8f267952008-02-06 01:38:46 -0800228
229 spin_lock_irqsave(&ds1511_lock, flags);
230 rtc_disable_update();
231 rtc_write(cen, RTC_CENTURY);
232 rtc_write(yrs, RTC_YEAR);
233 rtc_write((rtc_read(RTC_MON) & 0xe0) | mon, RTC_MON);
234 rtc_write(day, RTC_DOM);
235 rtc_write(hrs, RTC_HOUR);
236 rtc_write(min, RTC_MIN);
237 rtc_write(sec, RTC_SEC);
238 rtc_write(dow, RTC_DOW);
239 rtc_enable_update();
240 spin_unlock_irqrestore(&ds1511_lock, flags);
241
242 return 0;
243}
244
Adrian Bunka3ed1072008-04-28 02:11:55 -0700245static int ds1511_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
Andrew Sharp8f267952008-02-06 01:38:46 -0800246{
247 unsigned int century;
Steven Rostedt9a0f4ae2008-05-06 20:42:30 -0700248 unsigned long flags;
Andrew Sharp8f267952008-02-06 01:38:46 -0800249
250 spin_lock_irqsave(&ds1511_lock, flags);
251 rtc_disable_update();
252
253 rtc_tm->tm_sec = rtc_read(RTC_SEC) & 0x7f;
254 rtc_tm->tm_min = rtc_read(RTC_MIN) & 0x7f;
255 rtc_tm->tm_hour = rtc_read(RTC_HOUR) & 0x3f;
256 rtc_tm->tm_mday = rtc_read(RTC_DOM) & 0x3f;
257 rtc_tm->tm_wday = rtc_read(RTC_DOW) & 0x7;
258 rtc_tm->tm_mon = rtc_read(RTC_MON) & 0x1f;
259 rtc_tm->tm_year = rtc_read(RTC_YEAR) & 0x7f;
260 century = rtc_read(RTC_CENTURY);
261
262 rtc_enable_update();
263 spin_unlock_irqrestore(&ds1511_lock, flags);
264
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700265 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
266 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
267 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
268 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
269 rtc_tm->tm_wday = bcd2bin(rtc_tm->tm_wday);
270 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
271 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
272 century = bcd2bin(century) * 100;
Andrew Sharp8f267952008-02-06 01:38:46 -0800273
274 /*
275 * Account for differences between how the RTC uses the values
276 * and how they are defined in a struct rtc_time;
277 */
278 century += rtc_tm->tm_year;
279 rtc_tm->tm_year = century - 1900;
280
281 rtc_tm->tm_mon--;
282
283 if (rtc_valid_tm(rtc_tm) < 0) {
284 dev_err(dev, "retrieved date/time is not valid.\n");
285 rtc_time_to_tm(0, rtc_tm);
286 }
287 return 0;
288}
289
290/*
291 * write the alarm register settings
292 *
293 * we only have the use to interrupt every second, otherwise
294 * known as the update interrupt, or the interrupt if the whole
295 * date/hours/mins/secs matches. the ds1511 has many more
296 * permutations, but the kernel doesn't.
297 */
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700298static void
Andrew Sharp8f267952008-02-06 01:38:46 -0800299ds1511_rtc_update_alarm(struct rtc_plat_data *pdata)
300{
301 unsigned long flags;
302
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800303 spin_lock_irqsave(&pdata->lock, flags);
Andrew Sharp8f267952008-02-06 01:38:46 -0800304 rtc_write(pdata->alrm_mday < 0 || (pdata->irqen & RTC_UF) ?
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700305 0x80 : bin2bcd(pdata->alrm_mday) & 0x3f,
Andrew Sharp8f267952008-02-06 01:38:46 -0800306 RTC_ALARM_DATE);
307 rtc_write(pdata->alrm_hour < 0 || (pdata->irqen & RTC_UF) ?
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700308 0x80 : bin2bcd(pdata->alrm_hour) & 0x3f,
Andrew Sharp8f267952008-02-06 01:38:46 -0800309 RTC_ALARM_HOUR);
310 rtc_write(pdata->alrm_min < 0 || (pdata->irqen & RTC_UF) ?
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700311 0x80 : bin2bcd(pdata->alrm_min) & 0x7f,
Andrew Sharp8f267952008-02-06 01:38:46 -0800312 RTC_ALARM_MIN);
313 rtc_write(pdata->alrm_sec < 0 || (pdata->irqen & RTC_UF) ?
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700314 0x80 : bin2bcd(pdata->alrm_sec) & 0x7f,
Andrew Sharp8f267952008-02-06 01:38:46 -0800315 RTC_ALARM_SEC);
316 rtc_write(rtc_read(RTC_CMD) | (pdata->irqen ? RTC_TIE : 0), RTC_CMD);
317 rtc_read(RTC_CMD1); /* clear interrupts */
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800318 spin_unlock_irqrestore(&pdata->lock, flags);
Andrew Sharp8f267952008-02-06 01:38:46 -0800319}
320
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700321static int
Andrew Sharp8f267952008-02-06 01:38:46 -0800322ds1511_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
323{
324 struct platform_device *pdev = to_platform_device(dev);
325 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
326
Anton Vorontsov2fac6672009-01-06 14:42:11 -0800327 if (pdata->irq <= 0)
Andrew Sharp8f267952008-02-06 01:38:46 -0800328 return -EINVAL;
Anton Vorontsov2fac6672009-01-06 14:42:11 -0800329
Andrew Sharp8f267952008-02-06 01:38:46 -0800330 pdata->alrm_mday = alrm->time.tm_mday;
331 pdata->alrm_hour = alrm->time.tm_hour;
332 pdata->alrm_min = alrm->time.tm_min;
333 pdata->alrm_sec = alrm->time.tm_sec;
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700334 if (alrm->enabled)
Andrew Sharp8f267952008-02-06 01:38:46 -0800335 pdata->irqen |= RTC_AF;
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700336
Andrew Sharp8f267952008-02-06 01:38:46 -0800337 ds1511_rtc_update_alarm(pdata);
338 return 0;
339}
340
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700341static int
Andrew Sharp8f267952008-02-06 01:38:46 -0800342ds1511_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
343{
344 struct platform_device *pdev = to_platform_device(dev);
345 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
346
Anton Vorontsov2fac6672009-01-06 14:42:11 -0800347 if (pdata->irq <= 0)
Andrew Sharp8f267952008-02-06 01:38:46 -0800348 return -EINVAL;
Anton Vorontsov2fac6672009-01-06 14:42:11 -0800349
Andrew Sharp8f267952008-02-06 01:38:46 -0800350 alrm->time.tm_mday = pdata->alrm_mday < 0 ? 0 : pdata->alrm_mday;
351 alrm->time.tm_hour = pdata->alrm_hour < 0 ? 0 : pdata->alrm_hour;
352 alrm->time.tm_min = pdata->alrm_min < 0 ? 0 : pdata->alrm_min;
353 alrm->time.tm_sec = pdata->alrm_sec < 0 ? 0 : pdata->alrm_sec;
354 alrm->enabled = (pdata->irqen & RTC_AF) ? 1 : 0;
355 return 0;
356}
357
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700358static irqreturn_t
Andrew Sharp8f267952008-02-06 01:38:46 -0800359ds1511_interrupt(int irq, void *dev_id)
360{
361 struct platform_device *pdev = dev_id;
362 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800363 unsigned long events = 0;
Andrew Sharp8f267952008-02-06 01:38:46 -0800364
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800365 spin_lock(&pdata->lock);
Andrew Sharp8f267952008-02-06 01:38:46 -0800366 /*
367 * read and clear interrupt
368 */
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800369 if (rtc_read(RTC_CMD1) & DS1511_IRQF) {
370 events = RTC_IRQF;
371 if (rtc_read(RTC_ALARM_SEC) & 0x80)
372 events |= RTC_UF;
373 else
374 events |= RTC_AF;
375 if (likely(pdata->rtc))
376 rtc_update_irq(pdata->rtc, 1, events);
Andrew Sharp8f267952008-02-06 01:38:46 -0800377 }
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800378 spin_unlock(&pdata->lock);
379 return events ? IRQ_HANDLED : IRQ_NONE;
Andrew Sharp8f267952008-02-06 01:38:46 -0800380}
381
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800382static int ds1511_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
Andrew Sharp8f267952008-02-06 01:38:46 -0800383{
384 struct platform_device *pdev = to_platform_device(dev);
385 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
386
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800387 if (pdata->irq <= 0)
388 return -EINVAL;
389 if (enabled)
Andrew Sharp8f267952008-02-06 01:38:46 -0800390 pdata->irqen |= RTC_AF;
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800391 else
392 pdata->irqen &= ~RTC_AF;
393 ds1511_rtc_update_alarm(pdata);
394 return 0;
395}
396
Andrew Sharp8f267952008-02-06 01:38:46 -0800397static const struct rtc_class_ops ds1511_rtc_ops = {
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800398 .read_time = ds1511_rtc_read_time,
399 .set_time = ds1511_rtc_set_time,
400 .read_alarm = ds1511_rtc_read_alarm,
401 .set_alarm = ds1511_rtc_set_alarm,
402 .alarm_irq_enable = ds1511_rtc_alarm_irq_enable,
Andrew Sharp8f267952008-02-06 01:38:46 -0800403};
404
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700405static ssize_t
Chris Wright2c3c8be2010-05-12 18:28:57 -0700406ds1511_nvram_read(struct file *filp, struct kobject *kobj,
407 struct bin_attribute *ba,
408 char *buf, loff_t pos, size_t size)
Andrew Sharp8f267952008-02-06 01:38:46 -0800409{
410 ssize_t count;
411
412 /*
413 * if count is more than one, turn on "burst" mode
414 * turn it off when you're done
415 */
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700416 if (size > 1)
Andrew Sharp8f267952008-02-06 01:38:46 -0800417 rtc_write((rtc_read(RTC_CMD) | DS1511_BME), RTC_CMD);
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700418
419 if (pos > DS1511_RAM_MAX)
Andrew Sharp8f267952008-02-06 01:38:46 -0800420 pos = DS1511_RAM_MAX;
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700421
422 if (size + pos > DS1511_RAM_MAX + 1)
Andrew Sharp8f267952008-02-06 01:38:46 -0800423 size = DS1511_RAM_MAX - pos + 1;
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700424
Andrew Sharp8f267952008-02-06 01:38:46 -0800425 rtc_write(pos, DS1511_RAMADDR_LSB);
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700426 for (count = 0; size > 0; count++, size--)
Andrew Sharp8f267952008-02-06 01:38:46 -0800427 *buf++ = rtc_read(DS1511_RAMDATA);
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700428
429 if (count > 1)
Andrew Sharp8f267952008-02-06 01:38:46 -0800430 rtc_write((rtc_read(RTC_CMD) & ~DS1511_BME), RTC_CMD);
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700431
Andrew Sharp8f267952008-02-06 01:38:46 -0800432 return count;
433}
434
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700435static ssize_t
Chris Wright2c3c8be2010-05-12 18:28:57 -0700436ds1511_nvram_write(struct file *filp, struct kobject *kobj,
437 struct bin_attribute *bin_attr,
438 char *buf, loff_t pos, size_t size)
Andrew Sharp8f267952008-02-06 01:38:46 -0800439{
440 ssize_t count;
441
442 /*
443 * if count is more than one, turn on "burst" mode
444 * turn it off when you're done
445 */
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700446 if (size > 1)
Andrew Sharp8f267952008-02-06 01:38:46 -0800447 rtc_write((rtc_read(RTC_CMD) | DS1511_BME), RTC_CMD);
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700448
449 if (pos > DS1511_RAM_MAX)
Andrew Sharp8f267952008-02-06 01:38:46 -0800450 pos = DS1511_RAM_MAX;
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700451
452 if (size + pos > DS1511_RAM_MAX + 1)
Andrew Sharp8f267952008-02-06 01:38:46 -0800453 size = DS1511_RAM_MAX - pos + 1;
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700454
Andrew Sharp8f267952008-02-06 01:38:46 -0800455 rtc_write(pos, DS1511_RAMADDR_LSB);
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700456 for (count = 0; size > 0; count++, size--)
Andrew Sharp8f267952008-02-06 01:38:46 -0800457 rtc_write(*buf++, DS1511_RAMDATA);
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700458
459 if (count > 1)
Andrew Sharp8f267952008-02-06 01:38:46 -0800460 rtc_write((rtc_read(RTC_CMD) & ~DS1511_BME), RTC_CMD);
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700461
Andrew Sharp8f267952008-02-06 01:38:46 -0800462 return count;
463}
464
465static struct bin_attribute ds1511_nvram_attr = {
466 .attr = {
467 .name = "nvram",
Vasiliy Kulikov49d50fb2011-03-22 16:34:53 -0700468 .mode = S_IRUGO | S_IWUSR,
Andrew Sharp8f267952008-02-06 01:38:46 -0800469 },
470 .size = DS1511_RAM_MAX,
471 .read = ds1511_nvram_read,
472 .write = ds1511_nvram_write,
473};
474
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800475static int ds1511_rtc_probe(struct platform_device *pdev)
Andrew Sharp8f267952008-02-06 01:38:46 -0800476{
477 struct rtc_device *rtc;
478 struct resource *res;
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800479 struct rtc_plat_data *pdata;
Andrew Sharp8f267952008-02-06 01:38:46 -0800480 int ret = 0;
481
482 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700483 if (!res)
Andrew Sharp8f267952008-02-06 01:38:46 -0800484 return -ENODEV;
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700485
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800486 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
487 if (!pdata)
Andrew Sharp8f267952008-02-06 01:38:46 -0800488 return -ENOMEM;
Joe Perches28f65c112011-06-09 09:13:32 -0700489 pdata->size = resource_size(res);
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800490 if (!devm_request_mem_region(&pdev->dev, res->start, pdata->size,
491 pdev->name))
492 return -EBUSY;
493 ds1511_base = devm_ioremap(&pdev->dev, res->start, pdata->size);
494 if (!ds1511_base)
495 return -ENOMEM;
Andrew Sharp8f267952008-02-06 01:38:46 -0800496 pdata->ioaddr = ds1511_base;
497 pdata->irq = platform_get_irq(pdev, 0);
498
499 /*
500 * turn on the clock and the crystal, etc.
501 */
502 rtc_write(0, RTC_CMD);
503 rtc_write(0, RTC_CMD1);
504 /*
505 * clear the wdog counter
506 */
507 rtc_write(0, DS1511_WD_MSEC);
508 rtc_write(0, DS1511_WD_SEC);
509 /*
510 * start the clock
511 */
512 rtc_enable_update();
513
514 /*
515 * check for a dying bat-tree
516 */
Sachin Kamat7b2f0052013-07-03 15:05:49 -0700517 if (rtc_read(RTC_CMD1) & DS1511_BLF1)
Andrew Sharp8f267952008-02-06 01:38:46 -0800518 dev_warn(&pdev->dev, "voltage-low detected.\n");
Andrew Sharp8f267952008-02-06 01:38:46 -0800519
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800520 spin_lock_init(&pdata->lock);
521 platform_set_drvdata(pdev, pdata);
Andrew Sharp8f267952008-02-06 01:38:46 -0800522 /*
523 * if the platform has an interrupt in mind for this device,
524 * then by all means, set it
525 */
Anton Vorontsov2fac6672009-01-06 14:42:11 -0800526 if (pdata->irq > 0) {
Andrew Sharp8f267952008-02-06 01:38:46 -0800527 rtc_read(RTC_CMD1);
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800528 if (devm_request_irq(&pdev->dev, pdata->irq, ds1511_interrupt,
Yong Zhang2f6e5f92012-03-23 15:02:34 -0700529 IRQF_SHARED, pdev->name, pdev) < 0) {
Andrew Sharp8f267952008-02-06 01:38:46 -0800530
531 dev_warn(&pdev->dev, "interrupt not available.\n");
Anton Vorontsov2fac6672009-01-06 14:42:11 -0800532 pdata->irq = 0;
Andrew Sharp8f267952008-02-06 01:38:46 -0800533 }
534 }
535
Jingoo Hanf650e652013-04-29 16:18:59 -0700536 rtc = devm_rtc_device_register(&pdev->dev, pdev->name, &ds1511_rtc_ops,
537 THIS_MODULE);
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800538 if (IS_ERR(rtc))
539 return PTR_ERR(rtc);
Andrew Sharp8f267952008-02-06 01:38:46 -0800540 pdata->rtc = rtc;
Andrew Sharp8f267952008-02-06 01:38:46 -0800541
Atsushi Nemotoba4f3e42009-12-15 16:45:58 -0800542 ret = sysfs_create_bin_file(&pdev->dev.kobj, &ds1511_nvram_attr);
Jingoo Hanf650e652013-04-29 16:18:59 -0700543
Andrew Sharp8f267952008-02-06 01:38:46 -0800544 return ret;
545}
546
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800547static int ds1511_rtc_remove(struct platform_device *pdev)
Andrew Sharp8f267952008-02-06 01:38:46 -0800548{
549 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
550
551 sysfs_remove_bin_file(&pdev->dev.kobj, &ds1511_nvram_attr);
Anton Vorontsov2fac6672009-01-06 14:42:11 -0800552 if (pdata->irq > 0) {
Andrew Sharp8f267952008-02-06 01:38:46 -0800553 /*
554 * disable the alarm interrupt
555 */
556 rtc_write(rtc_read(RTC_CMD) & ~RTC_TIE, RTC_CMD);
557 rtc_read(RTC_CMD1);
Andrew Sharp8f267952008-02-06 01:38:46 -0800558 }
Andrew Sharp8f267952008-02-06 01:38:46 -0800559 return 0;
560}
561
Kay Sieversad28a072008-04-10 21:29:25 -0700562/* work with hotplug and coldplug */
563MODULE_ALIAS("platform:ds1511");
564
Andrew Sharp8f267952008-02-06 01:38:46 -0800565static struct platform_driver ds1511_rtc_driver = {
566 .probe = ds1511_rtc_probe,
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800567 .remove = ds1511_rtc_remove,
Andrew Sharp8f267952008-02-06 01:38:46 -0800568 .driver = {
569 .name = "ds1511",
570 .owner = THIS_MODULE,
571 },
572};
573
Axel Lin0c4eae62012-01-10 15:10:48 -0800574module_platform_driver(ds1511_rtc_driver);
Andrew Sharp8f267952008-02-06 01:38:46 -0800575
Andrew Sharp5b73a412009-09-23 16:03:20 -0700576MODULE_AUTHOR("Andrew Sharp <andy.sharp@lsi.com>");
Andrew Sharp8f267952008-02-06 01:38:46 -0800577MODULE_DESCRIPTION("Dallas DS1511 RTC driver");
578MODULE_LICENSE("GPL");
579MODULE_VERSION(DRV_VERSION);