blob: 9a81f778d6b22216469b641d0dbe44c809667fd8 [file] [log] [blame]
David Brownellf96411a2008-10-20 23:50:05 +02001/*
Balaji T Kef3b7d02009-12-13 21:30:48 +01002 * rtc-twl.c -- TWL Real Time Clock interface
David Brownellf96411a2008-10-20 23:50:05 +02003 *
4 * Copyright (C) 2007 MontaVista Software, Inc
5 * Author: Alexandre Rusev <source@mvista.com>
6 *
7 * Based on original TI driver twl4030-rtc.c
8 * Copyright (C) 2006 Texas Instruments, Inc.
9 *
10 * Based on rtc-omap.c
11 * Copyright (C) 2003 MontaVista Software, Inc.
12 * Author: George G. Davis <gdavis@mvista.com> or <source@mvista.com>
13 * Copyright (C) 2006 David Brownell
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 */
20
21#include <linux/kernel.h>
Anton Vorontsov2fac6672009-01-06 14:42:11 -080022#include <linux/errno.h>
David Brownellf96411a2008-10-20 23:50:05 +020023#include <linux/init.h>
24#include <linux/module.h>
25#include <linux/types.h>
26#include <linux/rtc.h>
27#include <linux/bcd.h>
28#include <linux/platform_device.h>
29#include <linux/interrupt.h>
30
Santosh Shilimkarb07682b2009-12-13 20:05:51 +010031#include <linux/i2c/twl.h>
David Brownellf96411a2008-10-20 23:50:05 +020032
33
34/*
35 * RTC block register offsets (use TWL_MODULE_RTC)
36 */
Balaji T Ka6b49ff2009-12-13 22:16:31 +010037enum {
38 REG_SECONDS_REG = 0,
39 REG_MINUTES_REG,
40 REG_HOURS_REG,
41 REG_DAYS_REG,
42 REG_MONTHS_REG,
43 REG_YEARS_REG,
44 REG_WEEKS_REG,
David Brownellf96411a2008-10-20 23:50:05 +020045
Balaji T Ka6b49ff2009-12-13 22:16:31 +010046 REG_ALARM_SECONDS_REG,
47 REG_ALARM_MINUTES_REG,
48 REG_ALARM_HOURS_REG,
49 REG_ALARM_DAYS_REG,
50 REG_ALARM_MONTHS_REG,
51 REG_ALARM_YEARS_REG,
David Brownellf96411a2008-10-20 23:50:05 +020052
Balaji T Ka6b49ff2009-12-13 22:16:31 +010053 REG_RTC_CTRL_REG,
54 REG_RTC_STATUS_REG,
55 REG_RTC_INTERRUPTS_REG,
David Brownellf96411a2008-10-20 23:50:05 +020056
Balaji T Ka6b49ff2009-12-13 22:16:31 +010057 REG_RTC_COMP_LSB_REG,
58 REG_RTC_COMP_MSB_REG,
59};
Tobias Klauser2e840672010-03-05 13:44:23 -080060static const u8 twl4030_rtc_reg_map[] = {
Balaji T Ka6b49ff2009-12-13 22:16:31 +010061 [REG_SECONDS_REG] = 0x00,
62 [REG_MINUTES_REG] = 0x01,
63 [REG_HOURS_REG] = 0x02,
64 [REG_DAYS_REG] = 0x03,
65 [REG_MONTHS_REG] = 0x04,
66 [REG_YEARS_REG] = 0x05,
67 [REG_WEEKS_REG] = 0x06,
68
69 [REG_ALARM_SECONDS_REG] = 0x07,
70 [REG_ALARM_MINUTES_REG] = 0x08,
71 [REG_ALARM_HOURS_REG] = 0x09,
72 [REG_ALARM_DAYS_REG] = 0x0A,
73 [REG_ALARM_MONTHS_REG] = 0x0B,
74 [REG_ALARM_YEARS_REG] = 0x0C,
75
76 [REG_RTC_CTRL_REG] = 0x0D,
77 [REG_RTC_STATUS_REG] = 0x0E,
78 [REG_RTC_INTERRUPTS_REG] = 0x0F,
79
80 [REG_RTC_COMP_LSB_REG] = 0x10,
81 [REG_RTC_COMP_MSB_REG] = 0x11,
82};
Tobias Klauser2e840672010-03-05 13:44:23 -080083static const u8 twl6030_rtc_reg_map[] = {
Balaji T Ka6b49ff2009-12-13 22:16:31 +010084 [REG_SECONDS_REG] = 0x00,
85 [REG_MINUTES_REG] = 0x01,
86 [REG_HOURS_REG] = 0x02,
87 [REG_DAYS_REG] = 0x03,
88 [REG_MONTHS_REG] = 0x04,
89 [REG_YEARS_REG] = 0x05,
90 [REG_WEEKS_REG] = 0x06,
91
92 [REG_ALARM_SECONDS_REG] = 0x08,
93 [REG_ALARM_MINUTES_REG] = 0x09,
94 [REG_ALARM_HOURS_REG] = 0x0A,
95 [REG_ALARM_DAYS_REG] = 0x0B,
96 [REG_ALARM_MONTHS_REG] = 0x0C,
97 [REG_ALARM_YEARS_REG] = 0x0D,
98
99 [REG_RTC_CTRL_REG] = 0x10,
100 [REG_RTC_STATUS_REG] = 0x11,
101 [REG_RTC_INTERRUPTS_REG] = 0x12,
102
103 [REG_RTC_COMP_LSB_REG] = 0x13,
104 [REG_RTC_COMP_MSB_REG] = 0x14,
105};
David Brownellf96411a2008-10-20 23:50:05 +0200106
107/* RTC_CTRL_REG bitfields */
108#define BIT_RTC_CTRL_REG_STOP_RTC_M 0x01
109#define BIT_RTC_CTRL_REG_ROUND_30S_M 0x02
110#define BIT_RTC_CTRL_REG_AUTO_COMP_M 0x04
111#define BIT_RTC_CTRL_REG_MODE_12_24_M 0x08
112#define BIT_RTC_CTRL_REG_TEST_MODE_M 0x10
113#define BIT_RTC_CTRL_REG_SET_32_COUNTER_M 0x20
114#define BIT_RTC_CTRL_REG_GET_TIME_M 0x40
115
116/* RTC_STATUS_REG bitfields */
117#define BIT_RTC_STATUS_REG_RUN_M 0x02
118#define BIT_RTC_STATUS_REG_1S_EVENT_M 0x04
119#define BIT_RTC_STATUS_REG_1M_EVENT_M 0x08
120#define BIT_RTC_STATUS_REG_1H_EVENT_M 0x10
121#define BIT_RTC_STATUS_REG_1D_EVENT_M 0x20
122#define BIT_RTC_STATUS_REG_ALARM_M 0x40
123#define BIT_RTC_STATUS_REG_POWER_UP_M 0x80
124
125/* RTC_INTERRUPTS_REG bitfields */
126#define BIT_RTC_INTERRUPTS_REG_EVERY_M 0x03
127#define BIT_RTC_INTERRUPTS_REG_IT_TIMER_M 0x04
128#define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M 0x08
129
130
131/* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */
132#define ALL_TIME_REGS 6
133
134/*----------------------------------------------------------------------*/
Balaji T Ka6b49ff2009-12-13 22:16:31 +0100135static u8 *rtc_reg_map;
David Brownellf96411a2008-10-20 23:50:05 +0200136
137/*
Balaji T Kef3b7d02009-12-13 21:30:48 +0100138 * Supports 1 byte read from TWL RTC register.
David Brownellf96411a2008-10-20 23:50:05 +0200139 */
Balaji T Kef3b7d02009-12-13 21:30:48 +0100140static int twl_rtc_read_u8(u8 *data, u8 reg)
David Brownellf96411a2008-10-20 23:50:05 +0200141{
142 int ret;
143
Balaji T Ka6b49ff2009-12-13 22:16:31 +0100144 ret = twl_i2c_read_u8(TWL_MODULE_RTC, data, (rtc_reg_map[reg]));
David Brownellf96411a2008-10-20 23:50:05 +0200145 if (ret < 0)
Balaji T Kef3b7d02009-12-13 21:30:48 +0100146 pr_err("twl_rtc: Could not read TWL"
David Brownellf96411a2008-10-20 23:50:05 +0200147 "register %X - error %d\n", reg, ret);
148 return ret;
149}
150
151/*
Balaji T Kef3b7d02009-12-13 21:30:48 +0100152 * Supports 1 byte write to TWL RTC registers.
David Brownellf96411a2008-10-20 23:50:05 +0200153 */
Balaji T Kef3b7d02009-12-13 21:30:48 +0100154static int twl_rtc_write_u8(u8 data, u8 reg)
David Brownellf96411a2008-10-20 23:50:05 +0200155{
156 int ret;
157
Balaji T Ka6b49ff2009-12-13 22:16:31 +0100158 ret = twl_i2c_write_u8(TWL_MODULE_RTC, data, (rtc_reg_map[reg]));
David Brownellf96411a2008-10-20 23:50:05 +0200159 if (ret < 0)
Balaji T Kef3b7d02009-12-13 21:30:48 +0100160 pr_err("twl_rtc: Could not write TWL"
David Brownellf96411a2008-10-20 23:50:05 +0200161 "register %X - error %d\n", reg, ret);
162 return ret;
163}
164
165/*
166 * Cache the value for timer/alarm interrupts register; this is
167 * only changed by callers holding rtc ops lock (or resume).
168 */
169static unsigned char rtc_irq_bits;
170
171/*
Alessandro Zummoa7483842009-01-15 13:50:52 -0800172 * Enable 1/second update and/or alarm interrupts.
David Brownellf96411a2008-10-20 23:50:05 +0200173 */
174static int set_rtc_irq_bit(unsigned char bit)
175{
176 unsigned char val;
177 int ret;
178
179 val = rtc_irq_bits | bit;
Alessandro Zummoa7483842009-01-15 13:50:52 -0800180 val &= ~BIT_RTC_INTERRUPTS_REG_EVERY_M;
Balaji T Kef3b7d02009-12-13 21:30:48 +0100181 ret = twl_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
David Brownellf96411a2008-10-20 23:50:05 +0200182 if (ret == 0)
183 rtc_irq_bits = val;
184
185 return ret;
186}
187
188/*
Alessandro Zummoa7483842009-01-15 13:50:52 -0800189 * Disable update and/or alarm interrupts.
David Brownellf96411a2008-10-20 23:50:05 +0200190 */
191static int mask_rtc_irq_bit(unsigned char bit)
192{
193 unsigned char val;
194 int ret;
195
196 val = rtc_irq_bits & ~bit;
Balaji T Kef3b7d02009-12-13 21:30:48 +0100197 ret = twl_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
David Brownellf96411a2008-10-20 23:50:05 +0200198 if (ret == 0)
199 rtc_irq_bits = val;
200
201 return ret;
202}
203
Balaji T Kef3b7d02009-12-13 21:30:48 +0100204static int twl_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
David Brownellf96411a2008-10-20 23:50:05 +0200205{
206 int ret;
207
208 if (enabled)
209 ret = set_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
210 else
211 ret = mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
212
213 return ret;
214}
215
David Brownellf96411a2008-10-20 23:50:05 +0200216/*
Balaji T Kef3b7d02009-12-13 21:30:48 +0100217 * Gets current TWL RTC time and date parameters.
David Brownellf96411a2008-10-20 23:50:05 +0200218 *
219 * The RTC's time/alarm representation is not what gmtime(3) requires
220 * Linux to use:
221 *
222 * - Months are 1..12 vs Linux 0-11
223 * - Years are 0..99 vs Linux 1900..N (we assume 21st century)
224 */
Balaji T Kef3b7d02009-12-13 21:30:48 +0100225static int twl_rtc_read_time(struct device *dev, struct rtc_time *tm)
David Brownellf96411a2008-10-20 23:50:05 +0200226{
227 unsigned char rtc_data[ALL_TIME_REGS + 1];
228 int ret;
229 u8 save_control;
230
Balaji T Kef3b7d02009-12-13 21:30:48 +0100231 ret = twl_rtc_read_u8(&save_control, REG_RTC_CTRL_REG);
David Brownellf96411a2008-10-20 23:50:05 +0200232 if (ret < 0)
233 return ret;
234
235 save_control |= BIT_RTC_CTRL_REG_GET_TIME_M;
236
Balaji T Kef3b7d02009-12-13 21:30:48 +0100237 ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
David Brownellf96411a2008-10-20 23:50:05 +0200238 if (ret < 0)
239 return ret;
240
Balaji T Kef3b7d02009-12-13 21:30:48 +0100241 ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
Balaji T Ka6b49ff2009-12-13 22:16:31 +0100242 (rtc_reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
David Brownellf96411a2008-10-20 23:50:05 +0200243
244 if (ret < 0) {
245 dev_err(dev, "rtc_read_time error %d\n", ret);
246 return ret;
247 }
248
249 tm->tm_sec = bcd2bin(rtc_data[0]);
250 tm->tm_min = bcd2bin(rtc_data[1]);
251 tm->tm_hour = bcd2bin(rtc_data[2]);
252 tm->tm_mday = bcd2bin(rtc_data[3]);
253 tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
254 tm->tm_year = bcd2bin(rtc_data[5]) + 100;
255
256 return ret;
257}
258
Balaji T Kef3b7d02009-12-13 21:30:48 +0100259static int twl_rtc_set_time(struct device *dev, struct rtc_time *tm)
David Brownellf96411a2008-10-20 23:50:05 +0200260{
261 unsigned char save_control;
262 unsigned char rtc_data[ALL_TIME_REGS + 1];
263 int ret;
264
265 rtc_data[1] = bin2bcd(tm->tm_sec);
266 rtc_data[2] = bin2bcd(tm->tm_min);
267 rtc_data[3] = bin2bcd(tm->tm_hour);
268 rtc_data[4] = bin2bcd(tm->tm_mday);
269 rtc_data[5] = bin2bcd(tm->tm_mon + 1);
270 rtc_data[6] = bin2bcd(tm->tm_year - 100);
271
272 /* Stop RTC while updating the TC registers */
Balaji T Kef3b7d02009-12-13 21:30:48 +0100273 ret = twl_rtc_read_u8(&save_control, REG_RTC_CTRL_REG);
David Brownellf96411a2008-10-20 23:50:05 +0200274 if (ret < 0)
275 goto out;
276
277 save_control &= ~BIT_RTC_CTRL_REG_STOP_RTC_M;
Jesper Juhl8f6b0dd2011-07-25 17:13:34 -0700278 ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
David Brownellf96411a2008-10-20 23:50:05 +0200279 if (ret < 0)
280 goto out;
281
282 /* update all the time registers in one shot */
Balaji T Kef3b7d02009-12-13 21:30:48 +0100283 ret = twl_i2c_write(TWL_MODULE_RTC, rtc_data,
Balaji T Ka6b49ff2009-12-13 22:16:31 +0100284 (rtc_reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
David Brownellf96411a2008-10-20 23:50:05 +0200285 if (ret < 0) {
286 dev_err(dev, "rtc_set_time error %d\n", ret);
287 goto out;
288 }
289
290 /* Start back RTC */
291 save_control |= BIT_RTC_CTRL_REG_STOP_RTC_M;
Balaji T Kef3b7d02009-12-13 21:30:48 +0100292 ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
David Brownellf96411a2008-10-20 23:50:05 +0200293
294out:
295 return ret;
296}
297
298/*
Balaji T Kef3b7d02009-12-13 21:30:48 +0100299 * Gets current TWL RTC alarm time.
David Brownellf96411a2008-10-20 23:50:05 +0200300 */
Balaji T Kef3b7d02009-12-13 21:30:48 +0100301static int twl_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
David Brownellf96411a2008-10-20 23:50:05 +0200302{
303 unsigned char rtc_data[ALL_TIME_REGS + 1];
304 int ret;
305
Balaji T Kef3b7d02009-12-13 21:30:48 +0100306 ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
Balaji T Ka6b49ff2009-12-13 22:16:31 +0100307 (rtc_reg_map[REG_ALARM_SECONDS_REG]), ALL_TIME_REGS);
David Brownellf96411a2008-10-20 23:50:05 +0200308 if (ret < 0) {
309 dev_err(dev, "rtc_read_alarm error %d\n", ret);
310 return ret;
311 }
312
313 /* some of these fields may be wildcard/"match all" */
314 alm->time.tm_sec = bcd2bin(rtc_data[0]);
315 alm->time.tm_min = bcd2bin(rtc_data[1]);
316 alm->time.tm_hour = bcd2bin(rtc_data[2]);
317 alm->time.tm_mday = bcd2bin(rtc_data[3]);
318 alm->time.tm_mon = bcd2bin(rtc_data[4]) - 1;
319 alm->time.tm_year = bcd2bin(rtc_data[5]) + 100;
320
321 /* report cached alarm enable state */
322 if (rtc_irq_bits & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M)
323 alm->enabled = 1;
324
325 return ret;
326}
327
Balaji T Kef3b7d02009-12-13 21:30:48 +0100328static int twl_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
David Brownellf96411a2008-10-20 23:50:05 +0200329{
330 unsigned char alarm_data[ALL_TIME_REGS + 1];
331 int ret;
332
Balaji T Kef3b7d02009-12-13 21:30:48 +0100333 ret = twl_rtc_alarm_irq_enable(dev, 0);
David Brownellf96411a2008-10-20 23:50:05 +0200334 if (ret)
335 goto out;
336
337 alarm_data[1] = bin2bcd(alm->time.tm_sec);
338 alarm_data[2] = bin2bcd(alm->time.tm_min);
339 alarm_data[3] = bin2bcd(alm->time.tm_hour);
340 alarm_data[4] = bin2bcd(alm->time.tm_mday);
341 alarm_data[5] = bin2bcd(alm->time.tm_mon + 1);
342 alarm_data[6] = bin2bcd(alm->time.tm_year - 100);
343
344 /* update all the alarm registers in one shot */
Balaji T Kef3b7d02009-12-13 21:30:48 +0100345 ret = twl_i2c_write(TWL_MODULE_RTC, alarm_data,
Balaji T Ka6b49ff2009-12-13 22:16:31 +0100346 (rtc_reg_map[REG_ALARM_SECONDS_REG]), ALL_TIME_REGS);
David Brownellf96411a2008-10-20 23:50:05 +0200347 if (ret) {
348 dev_err(dev, "rtc_set_alarm error %d\n", ret);
349 goto out;
350 }
351
352 if (alm->enabled)
Balaji T Kef3b7d02009-12-13 21:30:48 +0100353 ret = twl_rtc_alarm_irq_enable(dev, 1);
David Brownellf96411a2008-10-20 23:50:05 +0200354out:
355 return ret;
356}
357
Balaji T Kef3b7d02009-12-13 21:30:48 +0100358static irqreturn_t twl_rtc_interrupt(int irq, void *rtc)
David Brownellf96411a2008-10-20 23:50:05 +0200359{
360 unsigned long events = 0;
361 int ret = IRQ_NONE;
362 int res;
363 u8 rd_reg;
364
365#ifdef CONFIG_LOCKDEP
366 /* WORKAROUND for lockdep forcing IRQF_DISABLED on us, which
367 * we don't want and can't tolerate. Although it might be
368 * friendlier not to borrow this thread context...
369 */
370 local_irq_enable();
371#endif
372
Balaji T Kef3b7d02009-12-13 21:30:48 +0100373 res = twl_rtc_read_u8(&rd_reg, REG_RTC_STATUS_REG);
David Brownellf96411a2008-10-20 23:50:05 +0200374 if (res)
375 goto out;
376 /*
377 * Figure out source of interrupt: ALARM or TIMER in RTC_STATUS_REG.
378 * only one (ALARM or RTC) interrupt source may be enabled
379 * at time, we also could check our results
380 * by reading RTS_INTERRUPTS_REGISTER[IT_TIMER,IT_ALARM]
381 */
382 if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
383 events |= RTC_IRQF | RTC_AF;
384 else
385 events |= RTC_IRQF | RTC_UF;
386
Balaji T Kef3b7d02009-12-13 21:30:48 +0100387 res = twl_rtc_write_u8(rd_reg | BIT_RTC_STATUS_REG_ALARM_M,
David Brownellf96411a2008-10-20 23:50:05 +0200388 REG_RTC_STATUS_REG);
389 if (res)
390 goto out;
391
Balaji T Ka6b49ff2009-12-13 22:16:31 +0100392 if (twl_class_is_4030()) {
393 /* Clear on Read enabled. RTC_IT bit of TWL4030_INT_PWR_ISR1
394 * needs 2 reads to clear the interrupt. One read is done in
395 * do_twl_pwrirq(). Doing the second read, to clear
396 * the bit.
397 *
398 * FIXME the reason PWR_ISR1 needs an extra read is that
399 * RTC_IF retriggered until we cleared REG_ALARM_M above.
400 * But re-reading like this is a bad hack; by doing so we
401 * risk wrongly clearing status for some other IRQ (losing
402 * the interrupt). Be smarter about handling RTC_UF ...
403 */
404 res = twl_i2c_read_u8(TWL4030_MODULE_INT,
David Brownellf96411a2008-10-20 23:50:05 +0200405 &rd_reg, TWL4030_INT_PWR_ISR1);
Balaji T Ka6b49ff2009-12-13 22:16:31 +0100406 if (res)
407 goto out;
408 }
David Brownellf96411a2008-10-20 23:50:05 +0200409
410 /* Notify RTC core on event */
411 rtc_update_irq(rtc, 1, events);
412
413 ret = IRQ_HANDLED;
414out:
415 return ret;
416}
417
Balaji T Kef3b7d02009-12-13 21:30:48 +0100418static struct rtc_class_ops twl_rtc_ops = {
419 .read_time = twl_rtc_read_time,
420 .set_time = twl_rtc_set_time,
421 .read_alarm = twl_rtc_read_alarm,
422 .set_alarm = twl_rtc_set_alarm,
423 .alarm_irq_enable = twl_rtc_alarm_irq_enable,
David Brownellf96411a2008-10-20 23:50:05 +0200424};
425
426/*----------------------------------------------------------------------*/
427
Balaji T Kef3b7d02009-12-13 21:30:48 +0100428static int __devinit twl_rtc_probe(struct platform_device *pdev)
David Brownellf96411a2008-10-20 23:50:05 +0200429{
430 struct rtc_device *rtc;
431 int ret = 0;
432 int irq = platform_get_irq(pdev, 0);
433 u8 rd_reg;
434
Anton Vorontsov2fac6672009-01-06 14:42:11 -0800435 if (irq <= 0)
436 return -EINVAL;
David Brownellf96411a2008-10-20 23:50:05 +0200437
438 rtc = rtc_device_register(pdev->name,
Balaji T Kef3b7d02009-12-13 21:30:48 +0100439 &pdev->dev, &twl_rtc_ops, THIS_MODULE);
David Brownellf96411a2008-10-20 23:50:05 +0200440 if (IS_ERR(rtc)) {
Alessandro Zummoa7483842009-01-15 13:50:52 -0800441 ret = PTR_ERR(rtc);
David Brownellf96411a2008-10-20 23:50:05 +0200442 dev_err(&pdev->dev, "can't register RTC device, err %ld\n",
443 PTR_ERR(rtc));
444 goto out0;
445
446 }
447
448 platform_set_drvdata(pdev, rtc);
449
Balaji T Kef3b7d02009-12-13 21:30:48 +0100450 ret = twl_rtc_read_u8(&rd_reg, REG_RTC_STATUS_REG);
David Brownellf96411a2008-10-20 23:50:05 +0200451 if (ret < 0)
452 goto out1;
453
454 if (rd_reg & BIT_RTC_STATUS_REG_POWER_UP_M)
455 dev_warn(&pdev->dev, "Power up reset detected.\n");
456
457 if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
458 dev_warn(&pdev->dev, "Pending Alarm interrupt detected.\n");
459
460 /* Clear RTC Power up reset and pending alarm interrupts */
Balaji T Kef3b7d02009-12-13 21:30:48 +0100461 ret = twl_rtc_write_u8(rd_reg, REG_RTC_STATUS_REG);
David Brownellf96411a2008-10-20 23:50:05 +0200462 if (ret < 0)
463 goto out1;
464
Balaji T Kef3b7d02009-12-13 21:30:48 +0100465 ret = request_irq(irq, twl_rtc_interrupt,
David Brownellf96411a2008-10-20 23:50:05 +0200466 IRQF_TRIGGER_RISING,
Kay Sievers744bcb12009-03-24 16:38:22 -0700467 dev_name(&rtc->dev), rtc);
David Brownellf96411a2008-10-20 23:50:05 +0200468 if (ret < 0) {
469 dev_err(&pdev->dev, "IRQ is not free.\n");
470 goto out1;
471 }
472
Balaji T Ka6b49ff2009-12-13 22:16:31 +0100473 if (twl_class_is_6030()) {
474 twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
475 REG_INT_MSK_LINE_A);
476 twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
477 REG_INT_MSK_STS_A);
478 }
479
David Brownellf96411a2008-10-20 23:50:05 +0200480 /* Check RTC module status, Enable if it is off */
Balaji T Kef3b7d02009-12-13 21:30:48 +0100481 ret = twl_rtc_read_u8(&rd_reg, REG_RTC_CTRL_REG);
David Brownellf96411a2008-10-20 23:50:05 +0200482 if (ret < 0)
483 goto out2;
484
485 if (!(rd_reg & BIT_RTC_CTRL_REG_STOP_RTC_M)) {
Balaji T Kef3b7d02009-12-13 21:30:48 +0100486 dev_info(&pdev->dev, "Enabling TWL-RTC.\n");
David Brownellf96411a2008-10-20 23:50:05 +0200487 rd_reg = BIT_RTC_CTRL_REG_STOP_RTC_M;
Balaji T Kef3b7d02009-12-13 21:30:48 +0100488 ret = twl_rtc_write_u8(rd_reg, REG_RTC_CTRL_REG);
David Brownellf96411a2008-10-20 23:50:05 +0200489 if (ret < 0)
490 goto out2;
491 }
492
493 /* init cached IRQ enable bits */
Balaji T Kef3b7d02009-12-13 21:30:48 +0100494 ret = twl_rtc_read_u8(&rtc_irq_bits, REG_RTC_INTERRUPTS_REG);
David Brownellf96411a2008-10-20 23:50:05 +0200495 if (ret < 0)
496 goto out2;
497
498 return ret;
499
David Brownellf96411a2008-10-20 23:50:05 +0200500out2:
501 free_irq(irq, rtc);
502out1:
503 rtc_device_unregister(rtc);
504out0:
505 return ret;
506}
507
508/*
Balaji T Kef3b7d02009-12-13 21:30:48 +0100509 * Disable all TWL RTC module interrupts.
David Brownellf96411a2008-10-20 23:50:05 +0200510 * Sets status flag to free.
511 */
Balaji T Kef3b7d02009-12-13 21:30:48 +0100512static int __devexit twl_rtc_remove(struct platform_device *pdev)
David Brownellf96411a2008-10-20 23:50:05 +0200513{
514 /* leave rtc running, but disable irqs */
515 struct rtc_device *rtc = platform_get_drvdata(pdev);
516 int irq = platform_get_irq(pdev, 0);
517
518 mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
519 mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
Balaji T Ka6b49ff2009-12-13 22:16:31 +0100520 if (twl_class_is_6030()) {
521 twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
522 REG_INT_MSK_LINE_A);
523 twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
524 REG_INT_MSK_STS_A);
525 }
526
David Brownellf96411a2008-10-20 23:50:05 +0200527
528 free_irq(irq, rtc);
529
530 rtc_device_unregister(rtc);
531 platform_set_drvdata(pdev, NULL);
532 return 0;
533}
534
Balaji T Kef3b7d02009-12-13 21:30:48 +0100535static void twl_rtc_shutdown(struct platform_device *pdev)
David Brownellf96411a2008-10-20 23:50:05 +0200536{
Matti Halmecafa1d82009-01-15 13:50:56 -0800537 /* mask timer interrupts, but leave alarm interrupts on to enable
538 power-on when alarm is triggered */
539 mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
David Brownellf96411a2008-10-20 23:50:05 +0200540}
541
542#ifdef CONFIG_PM
543
544static unsigned char irqstat;
545
Balaji T Kef3b7d02009-12-13 21:30:48 +0100546static int twl_rtc_suspend(struct platform_device *pdev, pm_message_t state)
David Brownellf96411a2008-10-20 23:50:05 +0200547{
548 irqstat = rtc_irq_bits;
549
Kim Kyuwonf9930042009-05-12 13:19:38 -0700550 mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
David Brownellf96411a2008-10-20 23:50:05 +0200551 return 0;
552}
553
Balaji T Kef3b7d02009-12-13 21:30:48 +0100554static int twl_rtc_resume(struct platform_device *pdev)
David Brownellf96411a2008-10-20 23:50:05 +0200555{
556 set_rtc_irq_bit(irqstat);
557 return 0;
558}
559
560#else
Balaji T Kef3b7d02009-12-13 21:30:48 +0100561#define twl_rtc_suspend NULL
562#define twl_rtc_resume NULL
David Brownellf96411a2008-10-20 23:50:05 +0200563#endif
564
Balaji T Kef3b7d02009-12-13 21:30:48 +0100565MODULE_ALIAS("platform:twl_rtc");
David Brownellf96411a2008-10-20 23:50:05 +0200566
567static struct platform_driver twl4030rtc_driver = {
Balaji T Kef3b7d02009-12-13 21:30:48 +0100568 .probe = twl_rtc_probe,
569 .remove = __devexit_p(twl_rtc_remove),
570 .shutdown = twl_rtc_shutdown,
571 .suspend = twl_rtc_suspend,
572 .resume = twl_rtc_resume,
David Brownellf96411a2008-10-20 23:50:05 +0200573 .driver = {
574 .owner = THIS_MODULE,
Balaji T Kef3b7d02009-12-13 21:30:48 +0100575 .name = "twl_rtc",
David Brownellf96411a2008-10-20 23:50:05 +0200576 },
577};
578
Balaji T Kef3b7d02009-12-13 21:30:48 +0100579static int __init twl_rtc_init(void)
David Brownellf96411a2008-10-20 23:50:05 +0200580{
Balaji T Ka6b49ff2009-12-13 22:16:31 +0100581 if (twl_class_is_4030())
582 rtc_reg_map = (u8 *) twl4030_rtc_reg_map;
583 else
584 rtc_reg_map = (u8 *) twl6030_rtc_reg_map;
585
David Brownellf96411a2008-10-20 23:50:05 +0200586 return platform_driver_register(&twl4030rtc_driver);
587}
Balaji T Kef3b7d02009-12-13 21:30:48 +0100588module_init(twl_rtc_init);
David Brownellf96411a2008-10-20 23:50:05 +0200589
Balaji T Kef3b7d02009-12-13 21:30:48 +0100590static void __exit twl_rtc_exit(void)
David Brownellf96411a2008-10-20 23:50:05 +0200591{
592 platform_driver_unregister(&twl4030rtc_driver);
593}
Balaji T Kef3b7d02009-12-13 21:30:48 +0100594module_exit(twl_rtc_exit);
David Brownellf96411a2008-10-20 23:50:05 +0200595
596MODULE_AUTHOR("Texas Instruments, MontaVista Software");
597MODULE_LICENSE("GPL");