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linux/drivers/rtc/rtc-tps65910.c
Laxman Dewangan 225ccc2872 drivers/rtc/rtc-tps65910.c: set irq flag to IRQF_EARLY_RESUME during irq request 
All interrupt get disabled during system suspend and enabled during system
resume.  The enabling/disabling of interrupt happen in sequence of
interrupt registration with framework.

Therefore, in resume, the parent interrupt of this device enabled before
the RTC irq interrupt enabled.  If RTC is enabled for alarm wake and if
system wake by alarm then there is interrupt pending for RTC.  In resume,
the parent interrupt get enabled before the rtc interrupt and hence ISR
get served.  In ISR, it founds that rtc interrupt is disabled and so it
does not call the rtc isr handler and hence it misses the interrupt.

Setting flag for early resume so that rtc interrupt get enabled before
parent interrupt and so rtc interrupt get enabled when parent interrupt
handler check for interrupt of device and call the rtc handler if it is
there.  This way it will not miss the interrupt.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-21 17:22:28 -08:00

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/*
* rtc-tps65910.c -- TPS65910 Real Time Clock interface
*
* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
* Author: Venu Byravarasu <vbyravarasu@nvidia.com>
*
* Based on original TI driver rtc-twl.c
* Copyright (C) 2007 MontaVista Software, Inc
* Author: Alexandre Rusev <source@mvista.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/interrupt.h>
#include <linux/mfd/tps65910.h>
struct tps65910_rtc {
struct rtc_device *rtc;
int irq;
};
/* Total number of RTC registers needed to set time*/
#define NUM_TIME_REGS (TPS65910_YEARS - TPS65910_SECONDS + 1)
static int tps65910_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
{
struct tps65910 *tps = dev_get_drvdata(dev->parent);
u8 val = 0;
if (enabled)
val = TPS65910_RTC_INTERRUPTS_IT_ALARM;
return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, val);
}
/*
* Gets current tps65910 RTC time and date parameters.
*
* The RTC's time/alarm representation is not what gmtime(3) requires
* Linux to use:
*
* - Months are 1..12 vs Linux 0-11
* - Years are 0..99 vs Linux 1900..N (we assume 21st century)
*/
static int tps65910_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
unsigned char rtc_data[NUM_TIME_REGS];
struct tps65910 *tps = dev_get_drvdata(dev->parent);
int ret;
/* Copy RTC counting registers to static registers or latches */
ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
TPS65910_RTC_CTRL_GET_TIME, TPS65910_RTC_CTRL_GET_TIME);
if (ret < 0) {
dev_err(dev, "RTC CTRL reg update failed with err:%d\n", ret);
return ret;
}
ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, rtc_data,
NUM_TIME_REGS);
if (ret < 0) {
dev_err(dev, "reading from RTC failed with err:%d\n", ret);
return ret;
}
tm->tm_sec = bcd2bin(rtc_data[0]);
tm->tm_min = bcd2bin(rtc_data[1]);
tm->tm_hour = bcd2bin(rtc_data[2]);
tm->tm_mday = bcd2bin(rtc_data[3]);
tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
tm->tm_year = bcd2bin(rtc_data[5]) + 100;
return ret;
}
static int tps65910_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
unsigned char rtc_data[NUM_TIME_REGS];
struct tps65910 *tps = dev_get_drvdata(dev->parent);
int ret;
rtc_data[0] = bin2bcd(tm->tm_sec);
rtc_data[1] = bin2bcd(tm->tm_min);
rtc_data[2] = bin2bcd(tm->tm_hour);
rtc_data[3] = bin2bcd(tm->tm_mday);
rtc_data[4] = bin2bcd(tm->tm_mon + 1);
rtc_data[5] = bin2bcd(tm->tm_year - 100);
/* Stop RTC while updating the RTC time registers */
ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
TPS65910_RTC_CTRL_STOP_RTC, 0);
if (ret < 0) {
dev_err(dev, "RTC stop failed with err:%d\n", ret);
return ret;
}
/* update all the time registers in one shot */
ret = regmap_bulk_write(tps->regmap, TPS65910_SECONDS, rtc_data,
NUM_TIME_REGS);
if (ret < 0) {
dev_err(dev, "rtc_set_time error %d\n", ret);
return ret;
}
/* Start back RTC */
ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
TPS65910_RTC_CTRL_STOP_RTC, 1);
if (ret < 0)
dev_err(dev, "RTC start failed with err:%d\n", ret);
return ret;
}
/*
* Gets current tps65910 RTC alarm time.
*/
static int tps65910_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
unsigned char alarm_data[NUM_TIME_REGS];
u32 int_val;
struct tps65910 *tps = dev_get_drvdata(dev->parent);
int ret;
ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, alarm_data,
NUM_TIME_REGS);
if (ret < 0) {
dev_err(dev, "rtc_read_alarm error %d\n", ret);
return ret;
}
alm->time.tm_sec = bcd2bin(alarm_data[0]);
alm->time.tm_min = bcd2bin(alarm_data[1]);
alm->time.tm_hour = bcd2bin(alarm_data[2]);
alm->time.tm_mday = bcd2bin(alarm_data[3]);
alm->time.tm_mon = bcd2bin(alarm_data[4]) - 1;
alm->time.tm_year = bcd2bin(alarm_data[5]) + 100;
ret = regmap_read(tps->regmap, TPS65910_RTC_INTERRUPTS, &int_val);
if (ret < 0)
return ret;
if (int_val & TPS65910_RTC_INTERRUPTS_IT_ALARM)
alm->enabled = 1;
return ret;
}
static int tps65910_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
unsigned char alarm_data[NUM_TIME_REGS];
struct tps65910 *tps = dev_get_drvdata(dev->parent);
int ret;
ret = tps65910_rtc_alarm_irq_enable(dev, 0);
if (ret)
return ret;
alarm_data[0] = bin2bcd(alm->time.tm_sec);
alarm_data[1] = bin2bcd(alm->time.tm_min);
alarm_data[2] = bin2bcd(alm->time.tm_hour);
alarm_data[3] = bin2bcd(alm->time.tm_mday);
alarm_data[4] = bin2bcd(alm->time.tm_mon + 1);
alarm_data[5] = bin2bcd(alm->time.tm_year - 100);
/* update all the alarm registers in one shot */
ret = regmap_bulk_write(tps->regmap, TPS65910_ALARM_SECONDS,
alarm_data, NUM_TIME_REGS);
if (ret) {
dev_err(dev, "rtc_set_alarm error %d\n", ret);
return ret;
}
if (alm->enabled)
ret = tps65910_rtc_alarm_irq_enable(dev, 1);
return ret;
}
static irqreturn_t tps65910_rtc_interrupt(int irq, void *rtc)
{
struct device *dev = rtc;
unsigned long events = 0;
struct tps65910 *tps = dev_get_drvdata(dev->parent);
struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev);
int ret;
u32 rtc_reg;
ret = regmap_read(tps->regmap, TPS65910_RTC_STATUS, &rtc_reg);
if (ret)
return IRQ_NONE;
if (rtc_reg & TPS65910_RTC_STATUS_ALARM)
events = RTC_IRQF | RTC_AF;
ret = regmap_write(tps->regmap, TPS65910_RTC_STATUS, rtc_reg);
if (ret)
return IRQ_NONE;
/* Notify RTC core on event */
rtc_update_irq(tps_rtc->rtc, 1, events);
return IRQ_HANDLED;
}
static const struct rtc_class_ops tps65910_rtc_ops = {
.read_time = tps65910_rtc_read_time,
.set_time = tps65910_rtc_set_time,
.read_alarm = tps65910_rtc_read_alarm,
.set_alarm = tps65910_rtc_set_alarm,
.alarm_irq_enable = tps65910_rtc_alarm_irq_enable,
};
static int tps65910_rtc_probe(struct platform_device *pdev)
{
struct tps65910 *tps65910 = NULL;
struct tps65910_rtc *tps_rtc = NULL;
int ret;
int irq;
u32 rtc_reg;
tps65910 = dev_get_drvdata(pdev->dev.parent);
tps_rtc = devm_kzalloc(&pdev->dev, sizeof(struct tps65910_rtc),
GFP_KERNEL);
if (!tps_rtc)
return -ENOMEM;
/* Clear pending interrupts */
ret = regmap_read(tps65910->regmap, TPS65910_RTC_STATUS, &rtc_reg);
if (ret < 0)
return ret;
ret = regmap_write(tps65910->regmap, TPS65910_RTC_STATUS, rtc_reg);
if (ret < 0)
return ret;
dev_dbg(&pdev->dev, "Enabling rtc-tps65910.\n");
/* Enable RTC digital power domain */
ret = regmap_update_bits(tps65910->regmap, TPS65910_DEVCTRL,
DEVCTRL_RTC_PWDN_MASK, 0 << DEVCTRL_RTC_PWDN_SHIFT);
if (ret < 0)
return ret;
rtc_reg = TPS65910_RTC_CTRL_STOP_RTC;
ret = regmap_write(tps65910->regmap, TPS65910_RTC_CTRL, rtc_reg);
if (ret < 0)
return ret;
irq = platform_get_irq(pdev, 0);
if (irq <= 0) {
dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n",
irq);
return ret;
}
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
tps65910_rtc_interrupt, IRQF_TRIGGER_LOW | IRQF_EARLY_RESUME,
dev_name(&pdev->dev), &pdev->dev);
if (ret < 0) {
dev_err(&pdev->dev, "IRQ is not free.\n");
return ret;
}
tps_rtc->irq = irq;
device_set_wakeup_capable(&pdev->dev, 1);
tps_rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
&tps65910_rtc_ops, THIS_MODULE);
if (IS_ERR(tps_rtc->rtc)) {
ret = PTR_ERR(tps_rtc->rtc);
dev_err(&pdev->dev, "RTC device register: err %d\n", ret);
return ret;
}
platform_set_drvdata(pdev, tps_rtc);
return 0;
}
/*
* Disable tps65910 RTC interrupts.
* Sets status flag to free.
*/
static int tps65910_rtc_remove(struct platform_device *pdev)
{
/* leave rtc running, but disable irqs */
struct tps65910_rtc *tps_rtc = platform_get_drvdata(pdev);
tps65910_rtc_alarm_irq_enable(&pdev->dev, 0);
rtc_device_unregister(tps_rtc->rtc);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int tps65910_rtc_suspend(struct device *dev)
{
struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev);
if (device_may_wakeup(dev))
enable_irq_wake(tps_rtc->irq);
return 0;
}
static int tps65910_rtc_resume(struct device *dev)
{
struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev);
if (device_may_wakeup(dev))
disable_irq_wake(tps_rtc->irq);
return 0;
}
#endif
static const struct dev_pm_ops tps65910_rtc_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(tps65910_rtc_suspend, tps65910_rtc_resume)
};
static struct platform_driver tps65910_rtc_driver = {
.probe = tps65910_rtc_probe,
.remove = tps65910_rtc_remove,
.driver = {
.owner = THIS_MODULE,
.name = "tps65910-rtc",
.pm = &tps65910_rtc_pm_ops,
},
};
module_platform_driver(tps65910_rtc_driver);
MODULE_ALIAS("platform:rtc-tps65910");
MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
MODULE_LICENSE("GPL");
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