blob: 600971407aace469fcbd22d679dce74bbc525d5c [file] [log] [blame]
David Brownelldb68b182006-12-06 20:38:36 -08001/*
2 * TI OMAP1 Real Time Clock interface for Linux
3 *
4 * Copyright (C) 2003 MontaVista Software, Inc.
5 * Author: George G. Davis <gdavis@mvista.com> or <source@mvista.com>
6 *
7 * Copyright (C) 2006 David Brownell (new RTC framework)
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/module.h>
18#include <linux/ioport.h>
19#include <linux/delay.h>
20#include <linux/rtc.h>
21#include <linux/bcd.h>
22#include <linux/platform_device.h>
Afzal Mohammed9e0344d2012-12-17 16:02:15 -080023#include <linux/of.h>
24#include <linux/of_device.h>
Vaibhav Hiremathfc9bd902012-12-17 16:02:18 -080025#include <linux/pm_runtime.h>
David Brownelldb68b182006-12-06 20:38:36 -080026
27#include <asm/io.h>
David Brownelldb68b182006-12-06 20:38:36 -080028
29
30/* The OMAP1 RTC is a year/month/day/hours/minutes/seconds BCD clock
31 * with century-range alarm matching, driven by the 32kHz clock.
32 *
33 * The main user-visible ways it differs from PC RTCs are by omitting
34 * "don't care" alarm fields and sub-second periodic IRQs, and having
35 * an autoadjust mechanism to calibrate to the true oscillator rate.
36 *
37 * Board-specific wiring options include using split power mode with
38 * RTC_OFF_NOFF used as the reset signal (so the RTC won't be reset),
39 * and wiring RTC_WAKE_INT (so the RTC alarm can wake the system from
Sekhar Norifa5b0782010-10-27 15:33:05 -070040 * low power modes) for OMAP1 boards (OMAP-L138 has this built into
41 * the SoC). See the BOARD-SPECIFIC CUSTOMIZATION comment.
David Brownelldb68b182006-12-06 20:38:36 -080042 */
43
Afzal Mohammedcab14582012-12-17 16:02:11 -080044#define DRIVER_NAME "omap_rtc"
45
David Brownelldb68b182006-12-06 20:38:36 -080046#define OMAP_RTC_BASE 0xfffb4800
47
48/* RTC registers */
49#define OMAP_RTC_SECONDS_REG 0x00
50#define OMAP_RTC_MINUTES_REG 0x04
51#define OMAP_RTC_HOURS_REG 0x08
52#define OMAP_RTC_DAYS_REG 0x0C
53#define OMAP_RTC_MONTHS_REG 0x10
54#define OMAP_RTC_YEARS_REG 0x14
55#define OMAP_RTC_WEEKS_REG 0x18
56
57#define OMAP_RTC_ALARM_SECONDS_REG 0x20
58#define OMAP_RTC_ALARM_MINUTES_REG 0x24
59#define OMAP_RTC_ALARM_HOURS_REG 0x28
60#define OMAP_RTC_ALARM_DAYS_REG 0x2c
61#define OMAP_RTC_ALARM_MONTHS_REG 0x30
62#define OMAP_RTC_ALARM_YEARS_REG 0x34
63
64#define OMAP_RTC_CTRL_REG 0x40
65#define OMAP_RTC_STATUS_REG 0x44
66#define OMAP_RTC_INTERRUPTS_REG 0x48
67
68#define OMAP_RTC_COMP_LSB_REG 0x4c
69#define OMAP_RTC_COMP_MSB_REG 0x50
70#define OMAP_RTC_OSC_REG 0x54
71
Afzal Mohammedcab14582012-12-17 16:02:11 -080072#define OMAP_RTC_KICK0_REG 0x6c
73#define OMAP_RTC_KICK1_REG 0x70
74
David Brownelldb68b182006-12-06 20:38:36 -080075/* OMAP_RTC_CTRL_REG bit fields: */
76#define OMAP_RTC_CTRL_SPLIT (1<<7)
77#define OMAP_RTC_CTRL_DISABLE (1<<6)
78#define OMAP_RTC_CTRL_SET_32_COUNTER (1<<5)
79#define OMAP_RTC_CTRL_TEST (1<<4)
80#define OMAP_RTC_CTRL_MODE_12_24 (1<<3)
81#define OMAP_RTC_CTRL_AUTO_COMP (1<<2)
82#define OMAP_RTC_CTRL_ROUND_30S (1<<1)
83#define OMAP_RTC_CTRL_STOP (1<<0)
84
85/* OMAP_RTC_STATUS_REG bit fields: */
86#define OMAP_RTC_STATUS_POWER_UP (1<<7)
87#define OMAP_RTC_STATUS_ALARM (1<<6)
88#define OMAP_RTC_STATUS_1D_EVENT (1<<5)
89#define OMAP_RTC_STATUS_1H_EVENT (1<<4)
90#define OMAP_RTC_STATUS_1M_EVENT (1<<3)
91#define OMAP_RTC_STATUS_1S_EVENT (1<<2)
92#define OMAP_RTC_STATUS_RUN (1<<1)
93#define OMAP_RTC_STATUS_BUSY (1<<0)
94
95/* OMAP_RTC_INTERRUPTS_REG bit fields: */
96#define OMAP_RTC_INTERRUPTS_IT_ALARM (1<<3)
97#define OMAP_RTC_INTERRUPTS_IT_TIMER (1<<2)
98
Afzal Mohammedcab14582012-12-17 16:02:11 -080099/* OMAP_RTC_KICKER values */
100#define KICK0_VALUE 0x83e70b13
101#define KICK1_VALUE 0x95a4f1e0
102
103#define OMAP_RTC_HAS_KICKER 0x1
104
Mark A. Greer8cfde8c2009-12-15 16:46:11 -0800105static void __iomem *rtc_base;
David Brownelldb68b182006-12-06 20:38:36 -0800106
Afzal Mohammedcab14582012-12-17 16:02:11 -0800107#define rtc_read(addr) readb(rtc_base + (addr))
108#define rtc_write(val, addr) writeb(val, rtc_base + (addr))
109
110#define rtc_writel(val, addr) writel(val, rtc_base + (addr))
David Brownelldb68b182006-12-06 20:38:36 -0800111
112
David Brownelldb68b182006-12-06 20:38:36 -0800113/* we rely on the rtc framework to handle locking (rtc->ops_lock),
114 * so the only other requirement is that register accesses which
115 * require BUSY to be clear are made with IRQs locally disabled
116 */
117static void rtc_wait_not_busy(void)
118{
119 int count = 0;
120 u8 status;
121
122 /* BUSY may stay active for 1/32768 second (~30 usec) */
123 for (count = 0; count < 50; count++) {
124 status = rtc_read(OMAP_RTC_STATUS_REG);
125 if ((status & (u8)OMAP_RTC_STATUS_BUSY) == 0)
126 break;
127 udelay(1);
128 }
129 /* now we have ~15 usec to read/write various registers */
130}
131
David Brownellab6a2d72007-05-08 00:33:30 -0700132static irqreturn_t rtc_irq(int irq, void *rtc)
David Brownelldb68b182006-12-06 20:38:36 -0800133{
134 unsigned long events = 0;
135 u8 irq_data;
136
137 irq_data = rtc_read(OMAP_RTC_STATUS_REG);
138
139 /* alarm irq? */
140 if (irq_data & OMAP_RTC_STATUS_ALARM) {
141 rtc_write(OMAP_RTC_STATUS_ALARM, OMAP_RTC_STATUS_REG);
142 events |= RTC_IRQF | RTC_AF;
143 }
144
145 /* 1/sec periodic/update irq? */
146 if (irq_data & OMAP_RTC_STATUS_1S_EVENT)
147 events |= RTC_IRQF | RTC_UF;
148
David Brownellab6a2d72007-05-08 00:33:30 -0700149 rtc_update_irq(rtc, 1, events);
David Brownelldb68b182006-12-06 20:38:36 -0800150
151 return IRQ_HANDLED;
152}
153
John Stultz16380c12011-02-02 17:02:41 -0800154static int omap_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
155{
156 u8 reg;
157
158 local_irq_disable();
159 rtc_wait_not_busy();
160 reg = rtc_read(OMAP_RTC_INTERRUPTS_REG);
161 if (enabled)
162 reg |= OMAP_RTC_INTERRUPTS_IT_ALARM;
163 else
164 reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM;
165 rtc_wait_not_busy();
166 rtc_write(reg, OMAP_RTC_INTERRUPTS_REG);
167 local_irq_enable();
168
169 return 0;
170}
171
David Brownelldb68b182006-12-06 20:38:36 -0800172/* this hardware doesn't support "don't care" alarm fields */
173static int tm2bcd(struct rtc_time *tm)
174{
175 if (rtc_valid_tm(tm) != 0)
176 return -EINVAL;
177
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700178 tm->tm_sec = bin2bcd(tm->tm_sec);
179 tm->tm_min = bin2bcd(tm->tm_min);
180 tm->tm_hour = bin2bcd(tm->tm_hour);
181 tm->tm_mday = bin2bcd(tm->tm_mday);
David Brownelldb68b182006-12-06 20:38:36 -0800182
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700183 tm->tm_mon = bin2bcd(tm->tm_mon + 1);
David Brownelldb68b182006-12-06 20:38:36 -0800184
185 /* epoch == 1900 */
186 if (tm->tm_year < 100 || tm->tm_year > 199)
187 return -EINVAL;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700188 tm->tm_year = bin2bcd(tm->tm_year - 100);
David Brownelldb68b182006-12-06 20:38:36 -0800189
190 return 0;
191}
192
193static void bcd2tm(struct rtc_time *tm)
194{
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700195 tm->tm_sec = bcd2bin(tm->tm_sec);
196 tm->tm_min = bcd2bin(tm->tm_min);
197 tm->tm_hour = bcd2bin(tm->tm_hour);
198 tm->tm_mday = bcd2bin(tm->tm_mday);
199 tm->tm_mon = bcd2bin(tm->tm_mon) - 1;
David Brownelldb68b182006-12-06 20:38:36 -0800200 /* epoch == 1900 */
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700201 tm->tm_year = bcd2bin(tm->tm_year) + 100;
David Brownelldb68b182006-12-06 20:38:36 -0800202}
203
204
205static int omap_rtc_read_time(struct device *dev, struct rtc_time *tm)
206{
207 /* we don't report wday/yday/isdst ... */
208 local_irq_disable();
209 rtc_wait_not_busy();
210
211 tm->tm_sec = rtc_read(OMAP_RTC_SECONDS_REG);
212 tm->tm_min = rtc_read(OMAP_RTC_MINUTES_REG);
213 tm->tm_hour = rtc_read(OMAP_RTC_HOURS_REG);
214 tm->tm_mday = rtc_read(OMAP_RTC_DAYS_REG);
215 tm->tm_mon = rtc_read(OMAP_RTC_MONTHS_REG);
216 tm->tm_year = rtc_read(OMAP_RTC_YEARS_REG);
217
218 local_irq_enable();
219
220 bcd2tm(tm);
221 return 0;
222}
223
224static int omap_rtc_set_time(struct device *dev, struct rtc_time *tm)
225{
226 if (tm2bcd(tm) < 0)
227 return -EINVAL;
228 local_irq_disable();
229 rtc_wait_not_busy();
230
231 rtc_write(tm->tm_year, OMAP_RTC_YEARS_REG);
232 rtc_write(tm->tm_mon, OMAP_RTC_MONTHS_REG);
233 rtc_write(tm->tm_mday, OMAP_RTC_DAYS_REG);
234 rtc_write(tm->tm_hour, OMAP_RTC_HOURS_REG);
235 rtc_write(tm->tm_min, OMAP_RTC_MINUTES_REG);
236 rtc_write(tm->tm_sec, OMAP_RTC_SECONDS_REG);
237
238 local_irq_enable();
239
240 return 0;
241}
242
243static int omap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
244{
245 local_irq_disable();
246 rtc_wait_not_busy();
247
248 alm->time.tm_sec = rtc_read(OMAP_RTC_ALARM_SECONDS_REG);
249 alm->time.tm_min = rtc_read(OMAP_RTC_ALARM_MINUTES_REG);
250 alm->time.tm_hour = rtc_read(OMAP_RTC_ALARM_HOURS_REG);
251 alm->time.tm_mday = rtc_read(OMAP_RTC_ALARM_DAYS_REG);
252 alm->time.tm_mon = rtc_read(OMAP_RTC_ALARM_MONTHS_REG);
253 alm->time.tm_year = rtc_read(OMAP_RTC_ALARM_YEARS_REG);
254
255 local_irq_enable();
256
257 bcd2tm(&alm->time);
David Brownella2db8df2006-12-13 00:35:08 -0800258 alm->enabled = !!(rtc_read(OMAP_RTC_INTERRUPTS_REG)
David Brownelldb68b182006-12-06 20:38:36 -0800259 & OMAP_RTC_INTERRUPTS_IT_ALARM);
David Brownelldb68b182006-12-06 20:38:36 -0800260
261 return 0;
262}
263
264static int omap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
265{
266 u8 reg;
267
David Brownelldb68b182006-12-06 20:38:36 -0800268 if (tm2bcd(&alm->time) < 0)
269 return -EINVAL;
270
271 local_irq_disable();
272 rtc_wait_not_busy();
273
274 rtc_write(alm->time.tm_year, OMAP_RTC_ALARM_YEARS_REG);
275 rtc_write(alm->time.tm_mon, OMAP_RTC_ALARM_MONTHS_REG);
276 rtc_write(alm->time.tm_mday, OMAP_RTC_ALARM_DAYS_REG);
277 rtc_write(alm->time.tm_hour, OMAP_RTC_ALARM_HOURS_REG);
278 rtc_write(alm->time.tm_min, OMAP_RTC_ALARM_MINUTES_REG);
279 rtc_write(alm->time.tm_sec, OMAP_RTC_ALARM_SECONDS_REG);
280
281 reg = rtc_read(OMAP_RTC_INTERRUPTS_REG);
282 if (alm->enabled)
283 reg |= OMAP_RTC_INTERRUPTS_IT_ALARM;
284 else
285 reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM;
286 rtc_write(reg, OMAP_RTC_INTERRUPTS_REG);
287
288 local_irq_enable();
289
290 return 0;
291}
292
293static struct rtc_class_ops omap_rtc_ops = {
David Brownelldb68b182006-12-06 20:38:36 -0800294 .read_time = omap_rtc_read_time,
295 .set_time = omap_rtc_set_time,
296 .read_alarm = omap_rtc_read_alarm,
297 .set_alarm = omap_rtc_set_alarm,
John Stultz16380c12011-02-02 17:02:41 -0800298 .alarm_irq_enable = omap_rtc_alarm_irq_enable,
David Brownelldb68b182006-12-06 20:38:36 -0800299};
300
301static int omap_rtc_alarm;
302static int omap_rtc_timer;
303
Afzal Mohammed9e0344d2012-12-17 16:02:15 -0800304#define OMAP_RTC_DATA_DA830_IDX 1
305
Afzal Mohammedcab14582012-12-17 16:02:11 -0800306static struct platform_device_id omap_rtc_devtype[] = {
307 {
308 .name = DRIVER_NAME,
309 }, {
310 .name = "da830-rtc",
311 .driver_data = OMAP_RTC_HAS_KICKER,
312 },
313 {},
314};
315MODULE_DEVICE_TABLE(platform, omap_rtc_devtype);
316
Afzal Mohammed9e0344d2012-12-17 16:02:15 -0800317static const struct of_device_id omap_rtc_of_match[] = {
318 { .compatible = "ti,da830-rtc",
319 .data = &omap_rtc_devtype[OMAP_RTC_DATA_DA830_IDX],
320 },
321 {},
322};
323MODULE_DEVICE_TABLE(of, omap_rtc_of_match);
324
David Brownell71fc8222008-07-23 21:30:38 -0700325static int __init omap_rtc_probe(struct platform_device *pdev)
David Brownelldb68b182006-12-06 20:38:36 -0800326{
327 struct resource *res, *mem;
328 struct rtc_device *rtc;
329 u8 reg, new_ctrl;
Afzal Mohammedcab14582012-12-17 16:02:11 -0800330 const struct platform_device_id *id_entry;
Afzal Mohammed9e0344d2012-12-17 16:02:15 -0800331 const struct of_device_id *of_id;
332
333 of_id = of_match_device(omap_rtc_of_match, &pdev->dev);
334 if (of_id)
335 pdev->id_entry = of_id->data;
David Brownelldb68b182006-12-06 20:38:36 -0800336
337 omap_rtc_timer = platform_get_irq(pdev, 0);
338 if (omap_rtc_timer <= 0) {
339 pr_debug("%s: no update irq?\n", pdev->name);
340 return -ENOENT;
341 }
342
343 omap_rtc_alarm = platform_get_irq(pdev, 1);
344 if (omap_rtc_alarm <= 0) {
345 pr_debug("%s: no alarm irq?\n", pdev->name);
346 return -ENOENT;
347 }
348
David Brownelldb68b182006-12-06 20:38:36 -0800349 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
Mark A. Greer8cfde8c2009-12-15 16:46:11 -0800350 if (!res) {
351 pr_debug("%s: RTC resource data missing\n", pdev->name);
David Brownelldb68b182006-12-06 20:38:36 -0800352 return -ENOENT;
353 }
354
Mark A. Greer8cfde8c2009-12-15 16:46:11 -0800355 mem = request_mem_region(res->start, resource_size(res), pdev->name);
David Brownelldb68b182006-12-06 20:38:36 -0800356 if (!mem) {
357 pr_debug("%s: RTC registers at %08x are not free\n",
Mark A. Greer8cfde8c2009-12-15 16:46:11 -0800358 pdev->name, res->start);
David Brownelldb68b182006-12-06 20:38:36 -0800359 return -EBUSY;
360 }
361
Mark A. Greer8cfde8c2009-12-15 16:46:11 -0800362 rtc_base = ioremap(res->start, resource_size(res));
363 if (!rtc_base) {
364 pr_debug("%s: RTC registers can't be mapped\n", pdev->name);
365 goto fail;
366 }
367
Vaibhav Hiremathfc9bd902012-12-17 16:02:18 -0800368 /* Enable the clock/module so that we can access the registers */
369 pm_runtime_enable(&pdev->dev);
370 pm_runtime_get_sync(&pdev->dev);
371
Afzal Mohammedcab14582012-12-17 16:02:11 -0800372 id_entry = platform_get_device_id(pdev);
373 if (id_entry && (id_entry->driver_data & OMAP_RTC_HAS_KICKER)) {
374 rtc_writel(KICK0_VALUE, OMAP_RTC_KICK0_REG);
375 rtc_writel(KICK1_VALUE, OMAP_RTC_KICK1_REG);
376 }
377
David Brownelldb68b182006-12-06 20:38:36 -0800378 rtc = rtc_device_register(pdev->name, &pdev->dev,
379 &omap_rtc_ops, THIS_MODULE);
380 if (IS_ERR(rtc)) {
381 pr_debug("%s: can't register RTC device, err %ld\n",
382 pdev->name, PTR_ERR(rtc));
Mark A. Greer8cfde8c2009-12-15 16:46:11 -0800383 goto fail0;
David Brownelldb68b182006-12-06 20:38:36 -0800384 }
385 platform_set_drvdata(pdev, rtc);
David Brownell558a40f2007-05-16 22:11:14 -0700386 dev_set_drvdata(&rtc->dev, mem);
David Brownelldb68b182006-12-06 20:38:36 -0800387
388 /* clear pending irqs, and set 1/second periodic,
389 * which we'll use instead of update irqs
390 */
391 rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
392
393 /* clear old status */
394 reg = rtc_read(OMAP_RTC_STATUS_REG);
395 if (reg & (u8) OMAP_RTC_STATUS_POWER_UP) {
396 pr_info("%s: RTC power up reset detected\n",
397 pdev->name);
398 rtc_write(OMAP_RTC_STATUS_POWER_UP, OMAP_RTC_STATUS_REG);
399 }
400 if (reg & (u8) OMAP_RTC_STATUS_ALARM)
401 rtc_write(OMAP_RTC_STATUS_ALARM, OMAP_RTC_STATUS_REG);
402
403 /* handle periodic and alarm irqs */
Yong Zhang2f6e5f92012-03-23 15:02:34 -0700404 if (request_irq(omap_rtc_timer, rtc_irq, 0,
Kay Sievers744bcb12009-03-24 16:38:22 -0700405 dev_name(&rtc->dev), rtc)) {
David Brownelldb68b182006-12-06 20:38:36 -0800406 pr_debug("%s: RTC timer interrupt IRQ%d already claimed\n",
407 pdev->name, omap_rtc_timer);
Mark A. Greer8cfde8c2009-12-15 16:46:11 -0800408 goto fail1;
David Brownelldb68b182006-12-06 20:38:36 -0800409 }
Mark A. Greer8cfde8c2009-12-15 16:46:11 -0800410 if ((omap_rtc_timer != omap_rtc_alarm) &&
Yong Zhang2f6e5f92012-03-23 15:02:34 -0700411 (request_irq(omap_rtc_alarm, rtc_irq, 0,
Mark A. Greer8cfde8c2009-12-15 16:46:11 -0800412 dev_name(&rtc->dev), rtc))) {
David Brownelldb68b182006-12-06 20:38:36 -0800413 pr_debug("%s: RTC alarm interrupt IRQ%d already claimed\n",
414 pdev->name, omap_rtc_alarm);
Mark A. Greer8cfde8c2009-12-15 16:46:11 -0800415 goto fail2;
David Brownelldb68b182006-12-06 20:38:36 -0800416 }
417
418 /* On boards with split power, RTC_ON_NOFF won't reset the RTC */
419 reg = rtc_read(OMAP_RTC_CTRL_REG);
420 if (reg & (u8) OMAP_RTC_CTRL_STOP)
421 pr_info("%s: already running\n", pdev->name);
422
423 /* force to 24 hour mode */
Daniel Glöckner12b3e032011-08-03 16:21:02 -0700424 new_ctrl = reg & (OMAP_RTC_CTRL_SPLIT|OMAP_RTC_CTRL_AUTO_COMP);
David Brownelldb68b182006-12-06 20:38:36 -0800425 new_ctrl |= OMAP_RTC_CTRL_STOP;
426
427 /* BOARD-SPECIFIC CUSTOMIZATION CAN GO HERE:
428 *
Sekhar Norifa5b0782010-10-27 15:33:05 -0700429 * - Device wake-up capability setting should come through chip
430 * init logic. OMAP1 boards should initialize the "wakeup capable"
431 * flag in the platform device if the board is wired right for
432 * being woken up by RTC alarm. For OMAP-L138, this capability
433 * is built into the SoC by the "Deep Sleep" capability.
David Brownelldb68b182006-12-06 20:38:36 -0800434 *
435 * - Boards wired so RTC_ON_nOFF is used as the reset signal,
436 * rather than nPWRON_RESET, should forcibly enable split
437 * power mode. (Some chip errata report that RTC_CTRL_SPLIT
438 * is write-only, and always reads as zero...)
439 */
David Brownelldb68b182006-12-06 20:38:36 -0800440
441 if (new_ctrl & (u8) OMAP_RTC_CTRL_SPLIT)
442 pr_info("%s: split power mode\n", pdev->name);
443
444 if (reg != new_ctrl)
445 rtc_write(new_ctrl, OMAP_RTC_CTRL_REG);
446
447 return 0;
448
Mark A. Greer8cfde8c2009-12-15 16:46:11 -0800449fail2:
Axel Lin2dd93c42011-04-17 10:02:58 +0800450 free_irq(omap_rtc_timer, rtc);
Mark A. Greer8cfde8c2009-12-15 16:46:11 -0800451fail1:
David Brownelldb68b182006-12-06 20:38:36 -0800452 rtc_device_unregister(rtc);
Mark A. Greer8cfde8c2009-12-15 16:46:11 -0800453fail0:
Afzal Mohammedcab14582012-12-17 16:02:11 -0800454 if (id_entry && (id_entry->driver_data & OMAP_RTC_HAS_KICKER))
455 rtc_writel(0, OMAP_RTC_KICK0_REG);
Vaibhav Hiremathfc9bd902012-12-17 16:02:18 -0800456 pm_runtime_put_sync(&pdev->dev);
457 pm_runtime_disable(&pdev->dev);
Mark A. Greer8cfde8c2009-12-15 16:46:11 -0800458 iounmap(rtc_base);
David Brownelldb68b182006-12-06 20:38:36 -0800459fail:
Axel Lin19412ce2011-01-12 17:00:05 -0800460 release_mem_region(mem->start, resource_size(mem));
David Brownelldb68b182006-12-06 20:38:36 -0800461 return -EIO;
462}
463
David Brownell71fc8222008-07-23 21:30:38 -0700464static int __exit omap_rtc_remove(struct platform_device *pdev)
David Brownelldb68b182006-12-06 20:38:36 -0800465{
Joe Perchesa419aef2009-08-18 11:18:35 -0700466 struct rtc_device *rtc = platform_get_drvdata(pdev);
Axel Lin19412ce2011-01-12 17:00:05 -0800467 struct resource *mem = dev_get_drvdata(&rtc->dev);
Afzal Mohammedcab14582012-12-17 16:02:11 -0800468 const struct platform_device_id *id_entry =
469 platform_get_device_id(pdev);
David Brownelldb68b182006-12-06 20:38:36 -0800470
471 device_init_wakeup(&pdev->dev, 0);
472
473 /* leave rtc running, but disable irqs */
474 rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
475
476 free_irq(omap_rtc_timer, rtc);
Mark A. Greer8cfde8c2009-12-15 16:46:11 -0800477
478 if (omap_rtc_timer != omap_rtc_alarm)
479 free_irq(omap_rtc_alarm, rtc);
David Brownelldb68b182006-12-06 20:38:36 -0800480
David Brownelldb68b182006-12-06 20:38:36 -0800481 rtc_device_unregister(rtc);
Afzal Mohammedcab14582012-12-17 16:02:11 -0800482 if (id_entry && (id_entry->driver_data & OMAP_RTC_HAS_KICKER))
483 rtc_writel(0, OMAP_RTC_KICK0_REG);
Vaibhav Hiremathfc9bd902012-12-17 16:02:18 -0800484
485 /* Disable the clock/module */
486 pm_runtime_put_sync(&pdev->dev);
487 pm_runtime_disable(&pdev->dev);
488
Axel Lin19412ce2011-01-12 17:00:05 -0800489 iounmap(rtc_base);
490 release_mem_region(mem->start, resource_size(mem));
David Brownelldb68b182006-12-06 20:38:36 -0800491 return 0;
492}
493
494#ifdef CONFIG_PM
495
David Brownelldb68b182006-12-06 20:38:36 -0800496static u8 irqstat;
497
498static int omap_rtc_suspend(struct platform_device *pdev, pm_message_t state)
499{
David Brownelldb68b182006-12-06 20:38:36 -0800500 irqstat = rtc_read(OMAP_RTC_INTERRUPTS_REG);
501
502 /* FIXME the RTC alarm is not currently acting as a wakeup event
503 * source, and in fact this enable() call is just saving a flag
504 * that's never used...
505 */
506 if (device_may_wakeup(&pdev->dev))
507 enable_irq_wake(omap_rtc_alarm);
508 else
509 rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
510
Vaibhav Hiremathfc9bd902012-12-17 16:02:18 -0800511 /* Disable the clock/module */
512 pm_runtime_put_sync(&pdev->dev);
513
David Brownelldb68b182006-12-06 20:38:36 -0800514 return 0;
515}
516
517static int omap_rtc_resume(struct platform_device *pdev)
518{
Vaibhav Hiremathfc9bd902012-12-17 16:02:18 -0800519 /* Enable the clock/module so that we can access the registers */
520 pm_runtime_get_sync(&pdev->dev);
521
David Brownelldb68b182006-12-06 20:38:36 -0800522 if (device_may_wakeup(&pdev->dev))
523 disable_irq_wake(omap_rtc_alarm);
524 else
525 rtc_write(irqstat, OMAP_RTC_INTERRUPTS_REG);
526 return 0;
527}
528
529#else
530#define omap_rtc_suspend NULL
531#define omap_rtc_resume NULL
532#endif
533
534static void omap_rtc_shutdown(struct platform_device *pdev)
535{
536 rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
537}
538
Kay Sieversad28a072008-04-10 21:29:25 -0700539MODULE_ALIAS("platform:omap_rtc");
David Brownelldb68b182006-12-06 20:38:36 -0800540static struct platform_driver omap_rtc_driver = {
David Brownell71fc8222008-07-23 21:30:38 -0700541 .remove = __exit_p(omap_rtc_remove),
David Brownelldb68b182006-12-06 20:38:36 -0800542 .suspend = omap_rtc_suspend,
543 .resume = omap_rtc_resume,
544 .shutdown = omap_rtc_shutdown,
545 .driver = {
Afzal Mohammedcab14582012-12-17 16:02:11 -0800546 .name = DRIVER_NAME,
David Brownelldb68b182006-12-06 20:38:36 -0800547 .owner = THIS_MODULE,
Afzal Mohammed9e0344d2012-12-17 16:02:15 -0800548 .of_match_table = of_match_ptr(omap_rtc_of_match),
David Brownelldb68b182006-12-06 20:38:36 -0800549 },
Afzal Mohammedcab14582012-12-17 16:02:11 -0800550 .id_table = omap_rtc_devtype,
David Brownelldb68b182006-12-06 20:38:36 -0800551};
552
553static int __init rtc_init(void)
554{
David Brownell71fc8222008-07-23 21:30:38 -0700555 return platform_driver_probe(&omap_rtc_driver, omap_rtc_probe);
David Brownelldb68b182006-12-06 20:38:36 -0800556}
557module_init(rtc_init);
558
559static void __exit rtc_exit(void)
560{
561 platform_driver_unregister(&omap_rtc_driver);
562}
563module_exit(rtc_exit);
564
565MODULE_AUTHOR("George G. Davis (and others)");
566MODULE_LICENSE("GPL");