linux/drivers/rtc/rtc-mt6397.c
Linus Torvalds eadc4e40e6 RTC for 5.6
Subsystem:
  - the VL_READ and VL_CLR ioctls are now documented and their behavior is
    unified across all the drivers.
  - RTC_I2C_AND_SPI Kconfig option rework to avoid selecting both REGMAP_I2C and
    REGMAP_SPI unecessarily.
 
 Drivers:
  - at91rm9200: remove deprecated procfs, add sam9x60, sama5d4 and sama5d2
    compatibles.
  - cmos: solve lost interrupts issue on MS Surface 3
  - hym8563: return proper errno when time is invalid
  - rv3029: many fixes, nvram support
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Merge tag 'rtc-5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux

Pull RTC updates from Alexandre Belloni:
 "The VL_READ and VL_CLR ioctls have been reworked to be more useful.
  This will not break userspace as there are very few users and they are
  using the integer value as a boolean.

  Apart from that, two drivers were reworked and a few fixes here and
  there for a net reduction of number of lines.

  Summary:

  Subsystem:
   - the VL_READ and VL_CLR ioctls are now documented and their behavior
     is unified across all the drivers.
   - RTC_I2C_AND_SPI Kconfig option rework to avoid selecting both
     REGMAP_I2C and REGMAP_SPI unecessarily.

  Drivers:
   - at91rm9200: remove deprecated procfs, add sam9x60, sama5d4 and
     sama5d2 compatibles.
   - cmos: solve lost interrupts issue on MS Surface 3
   - hym8563: return proper errno when time is invalid
   - rv3029: many fixes, nvram support"

* tag 'rtc-5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (63 commits)
  dt-bindings: rtc: at91rm9200: document clocks property
  rtc: i2c/spi: Avoid inclusion of REGMAP support when not needed
  rtc: Kconfig: select REGMAP_I2C when necessary
  rtc: Kconfig: properly indent sd3078 entry
  rtc: cmos: Refactor code by using the new dmi_get_bios_year() helper
  rtc: cmos: Use predefined value for RTC IRQ on legacy x86
  rtc: cmos: Stop using shared IRQ
  rtc: tps6586x: Use IRQ_NOAUTOEN flag
  rtc: at91rm9200: use FIELD_PREP/FIELD_GET
  rtc: at91rm9200: avoid time readout in at91_rtc_setalarm
  rtc: at91rm9200: move register definitions to C file
  rtc: at91rm9200: add sama5d4 and sama5d2 compatibles
  dt-bindings: rtc: at91rm9200: convert bindings to json-schema
  rtc: at91rm9200: remove procfs information
  dt-bindings: atmel, at91rm9200-rtc: add microchip, sam9x60-rtc
  rtc: pcf8563: Use BIT
  rtc: moxart: Convert to SPDX identifier
  rtc: ds1343: Remove unused struct spi_device in struct ds1343_priv
  rtc: rx8025: Remove struct i2c_client from struct rx8025_data
  rtc: hym8563: Read the valid flag directly instead of caching it
  ...
2020-02-04 07:03:40 +00:00

349 lines
8.7 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2014-2015 MediaTek Inc.
* Author: Tianping.Fang <tianping.fang@mediatek.com>
*/
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/mfd/mt6397/core.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
#include <linux/mfd/mt6397/rtc.h>
#include <linux/mod_devicetable.h>
static int mtk_rtc_write_trigger(struct mt6397_rtc *rtc)
{
int ret;
u32 data;
ret = regmap_write(rtc->regmap, rtc->addr_base + RTC_WRTGR, 1);
if (ret < 0)
return ret;
ret = regmap_read_poll_timeout(rtc->regmap,
rtc->addr_base + RTC_BBPU, data,
!(data & RTC_BBPU_CBUSY),
MTK_RTC_POLL_DELAY_US,
MTK_RTC_POLL_TIMEOUT);
if (ret < 0)
dev_err(rtc->dev, "failed to write WRTGE: %d\n", ret);
return ret;
}
static irqreturn_t mtk_rtc_irq_handler_thread(int irq, void *data)
{
struct mt6397_rtc *rtc = data;
u32 irqsta, irqen;
int ret;
ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_IRQ_STA, &irqsta);
if ((ret >= 0) && (irqsta & RTC_IRQ_STA_AL)) {
rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);
irqen = irqsta & ~RTC_IRQ_EN_AL;
mutex_lock(&rtc->lock);
if (regmap_write(rtc->regmap, rtc->addr_base + RTC_IRQ_EN,
irqen) == 0)
mtk_rtc_write_trigger(rtc);
mutex_unlock(&rtc->lock);
return IRQ_HANDLED;
}
return IRQ_NONE;
}
static int __mtk_rtc_read_time(struct mt6397_rtc *rtc,
struct rtc_time *tm, int *sec)
{
int ret;
u16 data[RTC_OFFSET_COUNT];
mutex_lock(&rtc->lock);
ret = regmap_bulk_read(rtc->regmap, rtc->addr_base + RTC_TC_SEC,
data, RTC_OFFSET_COUNT);
if (ret < 0)
goto exit;
tm->tm_sec = data[RTC_OFFSET_SEC];
tm->tm_min = data[RTC_OFFSET_MIN];
tm->tm_hour = data[RTC_OFFSET_HOUR];
tm->tm_mday = data[RTC_OFFSET_DOM];
tm->tm_mon = data[RTC_OFFSET_MTH];
tm->tm_year = data[RTC_OFFSET_YEAR];
ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_TC_SEC, sec);
exit:
mutex_unlock(&rtc->lock);
return ret;
}
static int mtk_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
time64_t time;
struct mt6397_rtc *rtc = dev_get_drvdata(dev);
int days, sec, ret;
do {
ret = __mtk_rtc_read_time(rtc, tm, &sec);
if (ret < 0)
goto exit;
} while (sec < tm->tm_sec);
/* HW register use 7 bits to store year data, minus
* RTC_MIN_YEAR_OFFSET before write year data to register, and plus
* RTC_MIN_YEAR_OFFSET back after read year from register
*/
tm->tm_year += RTC_MIN_YEAR_OFFSET;
/* HW register start mon from one, but tm_mon start from zero. */
tm->tm_mon--;
time = rtc_tm_to_time64(tm);
/* rtc_tm_to_time64 covert Gregorian date to seconds since
* 01-01-1970 00:00:00, and this date is Thursday.
*/
days = div_s64(time, 86400);
tm->tm_wday = (days + 4) % 7;
exit:
return ret;
}
static int mtk_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct mt6397_rtc *rtc = dev_get_drvdata(dev);
int ret;
u16 data[RTC_OFFSET_COUNT];
tm->tm_year -= RTC_MIN_YEAR_OFFSET;
tm->tm_mon++;
data[RTC_OFFSET_SEC] = tm->tm_sec;
data[RTC_OFFSET_MIN] = tm->tm_min;
data[RTC_OFFSET_HOUR] = tm->tm_hour;
data[RTC_OFFSET_DOM] = tm->tm_mday;
data[RTC_OFFSET_MTH] = tm->tm_mon;
data[RTC_OFFSET_YEAR] = tm->tm_year;
mutex_lock(&rtc->lock);
ret = regmap_bulk_write(rtc->regmap, rtc->addr_base + RTC_TC_SEC,
data, RTC_OFFSET_COUNT);
if (ret < 0)
goto exit;
/* Time register write to hardware after call trigger function */
ret = mtk_rtc_write_trigger(rtc);
exit:
mutex_unlock(&rtc->lock);
return ret;
}
static int mtk_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
struct rtc_time *tm = &alm->time;
struct mt6397_rtc *rtc = dev_get_drvdata(dev);
u32 irqen, pdn2;
int ret;
u16 data[RTC_OFFSET_COUNT];
mutex_lock(&rtc->lock);
ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_IRQ_EN, &irqen);
if (ret < 0)
goto err_exit;
ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_PDN2, &pdn2);
if (ret < 0)
goto err_exit;
ret = regmap_bulk_read(rtc->regmap, rtc->addr_base + RTC_AL_SEC,
data, RTC_OFFSET_COUNT);
if (ret < 0)
goto err_exit;
alm->enabled = !!(irqen & RTC_IRQ_EN_AL);
alm->pending = !!(pdn2 & RTC_PDN2_PWRON_ALARM);
mutex_unlock(&rtc->lock);
tm->tm_sec = data[RTC_OFFSET_SEC] & RTC_AL_SEC_MASK;
tm->tm_min = data[RTC_OFFSET_MIN] & RTC_AL_MIN_MASK;
tm->tm_hour = data[RTC_OFFSET_HOUR] & RTC_AL_HOU_MASK;
tm->tm_mday = data[RTC_OFFSET_DOM] & RTC_AL_DOM_MASK;
tm->tm_mon = data[RTC_OFFSET_MTH] & RTC_AL_MTH_MASK;
tm->tm_year = data[RTC_OFFSET_YEAR] & RTC_AL_YEA_MASK;
tm->tm_year += RTC_MIN_YEAR_OFFSET;
tm->tm_mon--;
return 0;
err_exit:
mutex_unlock(&rtc->lock);
return ret;
}
static int mtk_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
struct rtc_time *tm = &alm->time;
struct mt6397_rtc *rtc = dev_get_drvdata(dev);
int ret;
u16 data[RTC_OFFSET_COUNT];
tm->tm_year -= RTC_MIN_YEAR_OFFSET;
tm->tm_mon++;
mutex_lock(&rtc->lock);
ret = regmap_bulk_read(rtc->regmap, rtc->addr_base + RTC_AL_SEC,
data, RTC_OFFSET_COUNT);
if (ret < 0)
goto exit;
data[RTC_OFFSET_SEC] = ((data[RTC_OFFSET_SEC] & ~(RTC_AL_SEC_MASK)) |
(tm->tm_sec & RTC_AL_SEC_MASK));
data[RTC_OFFSET_MIN] = ((data[RTC_OFFSET_MIN] & ~(RTC_AL_MIN_MASK)) |
(tm->tm_min & RTC_AL_MIN_MASK));
data[RTC_OFFSET_HOUR] = ((data[RTC_OFFSET_HOUR] & ~(RTC_AL_HOU_MASK)) |
(tm->tm_hour & RTC_AL_HOU_MASK));
data[RTC_OFFSET_DOM] = ((data[RTC_OFFSET_DOM] & ~(RTC_AL_DOM_MASK)) |
(tm->tm_mday & RTC_AL_DOM_MASK));
data[RTC_OFFSET_MTH] = ((data[RTC_OFFSET_MTH] & ~(RTC_AL_MTH_MASK)) |
(tm->tm_mon & RTC_AL_MTH_MASK));
data[RTC_OFFSET_YEAR] = ((data[RTC_OFFSET_YEAR] & ~(RTC_AL_YEA_MASK)) |
(tm->tm_year & RTC_AL_YEA_MASK));
if (alm->enabled) {
ret = regmap_bulk_write(rtc->regmap,
rtc->addr_base + RTC_AL_SEC,
data, RTC_OFFSET_COUNT);
if (ret < 0)
goto exit;
ret = regmap_write(rtc->regmap, rtc->addr_base + RTC_AL_MASK,
RTC_AL_MASK_DOW);
if (ret < 0)
goto exit;
ret = regmap_update_bits(rtc->regmap,
rtc->addr_base + RTC_IRQ_EN,
RTC_IRQ_EN_ONESHOT_AL,
RTC_IRQ_EN_ONESHOT_AL);
if (ret < 0)
goto exit;
} else {
ret = regmap_update_bits(rtc->regmap,
rtc->addr_base + RTC_IRQ_EN,
RTC_IRQ_EN_ONESHOT_AL, 0);
if (ret < 0)
goto exit;
}
/* All alarm time register write to hardware after calling
* mtk_rtc_write_trigger. This can avoid race condition if alarm
* occur happen during writing alarm time register.
*/
ret = mtk_rtc_write_trigger(rtc);
exit:
mutex_unlock(&rtc->lock);
return ret;
}
static const struct rtc_class_ops mtk_rtc_ops = {
.read_time = mtk_rtc_read_time,
.set_time = mtk_rtc_set_time,
.read_alarm = mtk_rtc_read_alarm,
.set_alarm = mtk_rtc_set_alarm,
};
static int mtk_rtc_probe(struct platform_device *pdev)
{
struct resource *res;
struct mt6397_chip *mt6397_chip = dev_get_drvdata(pdev->dev.parent);
struct mt6397_rtc *rtc;
int ret;
rtc = devm_kzalloc(&pdev->dev, sizeof(struct mt6397_rtc), GFP_KERNEL);
if (!rtc)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
rtc->addr_base = res->start;
rtc->irq = platform_get_irq(pdev, 0);
if (rtc->irq < 0)
return rtc->irq;
rtc->regmap = mt6397_chip->regmap;
mutex_init(&rtc->lock);
platform_set_drvdata(pdev, rtc);
rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
if (IS_ERR(rtc->rtc_dev))
return PTR_ERR(rtc->rtc_dev);
ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
mtk_rtc_irq_handler_thread,
IRQF_ONESHOT | IRQF_TRIGGER_HIGH,
"mt6397-rtc", rtc);
if (ret) {
dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
rtc->irq, ret);
return ret;
}
device_init_wakeup(&pdev->dev, 1);
rtc->rtc_dev->ops = &mtk_rtc_ops;
return rtc_register_device(rtc->rtc_dev);
}
#ifdef CONFIG_PM_SLEEP
static int mt6397_rtc_suspend(struct device *dev)
{
struct mt6397_rtc *rtc = dev_get_drvdata(dev);
if (device_may_wakeup(dev))
enable_irq_wake(rtc->irq);
return 0;
}
static int mt6397_rtc_resume(struct device *dev)
{
struct mt6397_rtc *rtc = dev_get_drvdata(dev);
if (device_may_wakeup(dev))
disable_irq_wake(rtc->irq);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(mt6397_pm_ops, mt6397_rtc_suspend,
mt6397_rtc_resume);
static const struct of_device_id mt6397_rtc_of_match[] = {
{ .compatible = "mediatek,mt6323-rtc", },
{ .compatible = "mediatek,mt6397-rtc", },
{ }
};
MODULE_DEVICE_TABLE(of, mt6397_rtc_of_match);
static struct platform_driver mtk_rtc_driver = {
.driver = {
.name = "mt6397-rtc",
.of_match_table = mt6397_rtc_of_match,
.pm = &mt6397_pm_ops,
},
.probe = mtk_rtc_probe,
};
module_platform_driver(mtk_rtc_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Tianping Fang <tianping.fang@mediatek.com>");
MODULE_DESCRIPTION("RTC Driver for MediaTek MT6397 PMIC");