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![Alexandre Belloni](/assets/img/avatar_default.png)
dpm_sysfs_remove() and device_pm_remove() are already called by device_del() on device removal so there is no need to call device_init_wakeup(dev, false) from the driver and it allows to remove the .remove callback. Link: https://lore.kernel.org/r/20191021155806.3625-4-alexandre.belloni@bootlin.com Reviewed-by: Baolin Wang <baolin.wang@linaro.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
681 lines
18 KiB
C
681 lines
18 KiB
C
/*
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* Copyright (C) 2017 Spreadtrum Communications Inc.
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#include <linux/bitops.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/rtc.h>
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#define SPRD_RTC_SEC_CNT_VALUE 0x0
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#define SPRD_RTC_MIN_CNT_VALUE 0x4
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#define SPRD_RTC_HOUR_CNT_VALUE 0x8
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#define SPRD_RTC_DAY_CNT_VALUE 0xc
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#define SPRD_RTC_SEC_CNT_UPD 0x10
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#define SPRD_RTC_MIN_CNT_UPD 0x14
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#define SPRD_RTC_HOUR_CNT_UPD 0x18
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#define SPRD_RTC_DAY_CNT_UPD 0x1c
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#define SPRD_RTC_SEC_ALM_UPD 0x20
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#define SPRD_RTC_MIN_ALM_UPD 0x24
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#define SPRD_RTC_HOUR_ALM_UPD 0x28
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#define SPRD_RTC_DAY_ALM_UPD 0x2c
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#define SPRD_RTC_INT_EN 0x30
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#define SPRD_RTC_INT_RAW_STS 0x34
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#define SPRD_RTC_INT_CLR 0x38
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#define SPRD_RTC_INT_MASK_STS 0x3C
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#define SPRD_RTC_SEC_ALM_VALUE 0x40
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#define SPRD_RTC_MIN_ALM_VALUE 0x44
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#define SPRD_RTC_HOUR_ALM_VALUE 0x48
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#define SPRD_RTC_DAY_ALM_VALUE 0x4c
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#define SPRD_RTC_SPG_VALUE 0x50
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#define SPRD_RTC_SPG_UPD 0x54
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#define SPRD_RTC_PWR_CTRL 0x58
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#define SPRD_RTC_PWR_STS 0x5c
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#define SPRD_RTC_SEC_AUXALM_UPD 0x60
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#define SPRD_RTC_MIN_AUXALM_UPD 0x64
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#define SPRD_RTC_HOUR_AUXALM_UPD 0x68
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#define SPRD_RTC_DAY_AUXALM_UPD 0x6c
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/* BIT & MASK definition for SPRD_RTC_INT_* registers */
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#define SPRD_RTC_SEC_EN BIT(0)
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#define SPRD_RTC_MIN_EN BIT(1)
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#define SPRD_RTC_HOUR_EN BIT(2)
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#define SPRD_RTC_DAY_EN BIT(3)
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#define SPRD_RTC_ALARM_EN BIT(4)
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#define SPRD_RTC_HRS_FORMAT_EN BIT(5)
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#define SPRD_RTC_AUXALM_EN BIT(6)
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#define SPRD_RTC_SPG_UPD_EN BIT(7)
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#define SPRD_RTC_SEC_UPD_EN BIT(8)
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#define SPRD_RTC_MIN_UPD_EN BIT(9)
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#define SPRD_RTC_HOUR_UPD_EN BIT(10)
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#define SPRD_RTC_DAY_UPD_EN BIT(11)
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#define SPRD_RTC_ALMSEC_UPD_EN BIT(12)
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#define SPRD_RTC_ALMMIN_UPD_EN BIT(13)
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#define SPRD_RTC_ALMHOUR_UPD_EN BIT(14)
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#define SPRD_RTC_ALMDAY_UPD_EN BIT(15)
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#define SPRD_RTC_INT_MASK GENMASK(15, 0)
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#define SPRD_RTC_TIME_INT_MASK \
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(SPRD_RTC_SEC_UPD_EN | SPRD_RTC_MIN_UPD_EN | \
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SPRD_RTC_HOUR_UPD_EN | SPRD_RTC_DAY_UPD_EN)
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#define SPRD_RTC_ALMTIME_INT_MASK \
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(SPRD_RTC_ALMSEC_UPD_EN | SPRD_RTC_ALMMIN_UPD_EN | \
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SPRD_RTC_ALMHOUR_UPD_EN | SPRD_RTC_ALMDAY_UPD_EN)
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#define SPRD_RTC_ALM_INT_MASK \
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(SPRD_RTC_SEC_EN | SPRD_RTC_MIN_EN | \
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SPRD_RTC_HOUR_EN | SPRD_RTC_DAY_EN | \
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SPRD_RTC_ALARM_EN | SPRD_RTC_AUXALM_EN)
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/* second/minute/hour/day values mask definition */
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#define SPRD_RTC_SEC_MASK GENMASK(5, 0)
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#define SPRD_RTC_MIN_MASK GENMASK(5, 0)
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#define SPRD_RTC_HOUR_MASK GENMASK(4, 0)
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#define SPRD_RTC_DAY_MASK GENMASK(15, 0)
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/* alarm lock definition for SPRD_RTC_SPG_UPD register */
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#define SPRD_RTC_ALMLOCK_MASK GENMASK(7, 0)
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#define SPRD_RTC_ALM_UNLOCK 0xa5
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#define SPRD_RTC_ALM_LOCK (~SPRD_RTC_ALM_UNLOCK & \
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SPRD_RTC_ALMLOCK_MASK)
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/* SPG values definition for SPRD_RTC_SPG_UPD register */
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#define SPRD_RTC_POWEROFF_ALM_FLAG BIT(8)
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/* power control/status definition */
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#define SPRD_RTC_POWER_RESET_VALUE 0x96
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#define SPRD_RTC_POWER_STS_CLEAR GENMASK(7, 0)
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#define SPRD_RTC_POWER_STS_SHIFT 8
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#define SPRD_RTC_POWER_STS_VALID \
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(~SPRD_RTC_POWER_RESET_VALUE << SPRD_RTC_POWER_STS_SHIFT)
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/* timeout of synchronizing time and alarm registers (us) */
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#define SPRD_RTC_POLL_TIMEOUT 200000
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#define SPRD_RTC_POLL_DELAY_US 20000
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struct sprd_rtc {
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struct rtc_device *rtc;
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struct regmap *regmap;
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struct device *dev;
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u32 base;
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int irq;
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bool valid;
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};
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/*
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* The Spreadtrum RTC controller has 3 groups registers, including time, normal
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* alarm and auxiliary alarm. The time group registers are used to set RTC time,
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* the normal alarm registers are used to set normal alarm, and the auxiliary
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* alarm registers are used to set auxiliary alarm. Both alarm event and
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* auxiliary alarm event can wake up system from deep sleep, but only alarm
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* event can power up system from power down status.
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*/
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enum sprd_rtc_reg_types {
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SPRD_RTC_TIME,
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SPRD_RTC_ALARM,
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SPRD_RTC_AUX_ALARM,
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};
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static int sprd_rtc_clear_alarm_ints(struct sprd_rtc *rtc)
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{
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return regmap_write(rtc->regmap, rtc->base + SPRD_RTC_INT_CLR,
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SPRD_RTC_ALM_INT_MASK);
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}
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static int sprd_rtc_lock_alarm(struct sprd_rtc *rtc, bool lock)
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{
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int ret;
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u32 val;
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ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_SPG_VALUE, &val);
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if (ret)
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return ret;
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val &= ~SPRD_RTC_ALMLOCK_MASK;
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if (lock)
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val |= SPRD_RTC_ALM_LOCK;
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else
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val |= SPRD_RTC_ALM_UNLOCK | SPRD_RTC_POWEROFF_ALM_FLAG;
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ret = regmap_write(rtc->regmap, rtc->base + SPRD_RTC_SPG_UPD, val);
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if (ret)
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return ret;
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/* wait until the SPG value is updated successfully */
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ret = regmap_read_poll_timeout(rtc->regmap,
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rtc->base + SPRD_RTC_INT_RAW_STS, val,
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(val & SPRD_RTC_SPG_UPD_EN),
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SPRD_RTC_POLL_DELAY_US,
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SPRD_RTC_POLL_TIMEOUT);
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if (ret) {
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dev_err(rtc->dev, "failed to update SPG value:%d\n", ret);
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return ret;
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}
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return regmap_write(rtc->regmap, rtc->base + SPRD_RTC_INT_CLR,
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SPRD_RTC_SPG_UPD_EN);
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}
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static int sprd_rtc_get_secs(struct sprd_rtc *rtc, enum sprd_rtc_reg_types type,
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time64_t *secs)
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{
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u32 sec_reg, min_reg, hour_reg, day_reg;
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u32 val, sec, min, hour, day;
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int ret;
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switch (type) {
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case SPRD_RTC_TIME:
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sec_reg = SPRD_RTC_SEC_CNT_VALUE;
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min_reg = SPRD_RTC_MIN_CNT_VALUE;
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hour_reg = SPRD_RTC_HOUR_CNT_VALUE;
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day_reg = SPRD_RTC_DAY_CNT_VALUE;
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break;
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case SPRD_RTC_ALARM:
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sec_reg = SPRD_RTC_SEC_ALM_VALUE;
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min_reg = SPRD_RTC_MIN_ALM_VALUE;
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hour_reg = SPRD_RTC_HOUR_ALM_VALUE;
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day_reg = SPRD_RTC_DAY_ALM_VALUE;
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break;
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case SPRD_RTC_AUX_ALARM:
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sec_reg = SPRD_RTC_SEC_AUXALM_UPD;
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min_reg = SPRD_RTC_MIN_AUXALM_UPD;
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hour_reg = SPRD_RTC_HOUR_AUXALM_UPD;
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day_reg = SPRD_RTC_DAY_AUXALM_UPD;
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break;
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default:
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return -EINVAL;
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}
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ret = regmap_read(rtc->regmap, rtc->base + sec_reg, &val);
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if (ret)
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return ret;
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sec = val & SPRD_RTC_SEC_MASK;
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ret = regmap_read(rtc->regmap, rtc->base + min_reg, &val);
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if (ret)
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return ret;
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min = val & SPRD_RTC_MIN_MASK;
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ret = regmap_read(rtc->regmap, rtc->base + hour_reg, &val);
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if (ret)
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return ret;
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hour = val & SPRD_RTC_HOUR_MASK;
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ret = regmap_read(rtc->regmap, rtc->base + day_reg, &val);
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if (ret)
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return ret;
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day = val & SPRD_RTC_DAY_MASK;
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*secs = (((time64_t)(day * 24) + hour) * 60 + min) * 60 + sec;
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return 0;
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}
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static int sprd_rtc_set_secs(struct sprd_rtc *rtc, enum sprd_rtc_reg_types type,
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time64_t secs)
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{
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u32 sec_reg, min_reg, hour_reg, day_reg, sts_mask;
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u32 sec, min, hour, day, val;
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int ret, rem;
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/* convert seconds to RTC time format */
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day = div_s64_rem(secs, 86400, &rem);
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hour = rem / 3600;
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rem -= hour * 3600;
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min = rem / 60;
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sec = rem - min * 60;
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switch (type) {
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case SPRD_RTC_TIME:
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sec_reg = SPRD_RTC_SEC_CNT_UPD;
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min_reg = SPRD_RTC_MIN_CNT_UPD;
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hour_reg = SPRD_RTC_HOUR_CNT_UPD;
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day_reg = SPRD_RTC_DAY_CNT_UPD;
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sts_mask = SPRD_RTC_TIME_INT_MASK;
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break;
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case SPRD_RTC_ALARM:
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sec_reg = SPRD_RTC_SEC_ALM_UPD;
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min_reg = SPRD_RTC_MIN_ALM_UPD;
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hour_reg = SPRD_RTC_HOUR_ALM_UPD;
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day_reg = SPRD_RTC_DAY_ALM_UPD;
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sts_mask = SPRD_RTC_ALMTIME_INT_MASK;
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break;
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case SPRD_RTC_AUX_ALARM:
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sec_reg = SPRD_RTC_SEC_AUXALM_UPD;
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min_reg = SPRD_RTC_MIN_AUXALM_UPD;
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hour_reg = SPRD_RTC_HOUR_AUXALM_UPD;
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day_reg = SPRD_RTC_DAY_AUXALM_UPD;
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sts_mask = 0;
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break;
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default:
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return -EINVAL;
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}
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ret = regmap_write(rtc->regmap, rtc->base + sec_reg, sec);
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if (ret)
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return ret;
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ret = regmap_write(rtc->regmap, rtc->base + min_reg, min);
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if (ret)
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return ret;
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ret = regmap_write(rtc->regmap, rtc->base + hour_reg, hour);
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if (ret)
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return ret;
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ret = regmap_write(rtc->regmap, rtc->base + day_reg, day);
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if (ret)
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return ret;
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if (type == SPRD_RTC_AUX_ALARM)
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return 0;
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/*
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* Since the time and normal alarm registers are put in always-power-on
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* region supplied by VDDRTC, then these registers changing time will
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* be very long, about 125ms. Thus here we should wait until all
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* values are updated successfully.
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*/
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ret = regmap_read_poll_timeout(rtc->regmap,
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rtc->base + SPRD_RTC_INT_RAW_STS, val,
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((val & sts_mask) == sts_mask),
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SPRD_RTC_POLL_DELAY_US,
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SPRD_RTC_POLL_TIMEOUT);
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if (ret < 0) {
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dev_err(rtc->dev, "set time/alarm values timeout\n");
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return ret;
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}
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return regmap_write(rtc->regmap, rtc->base + SPRD_RTC_INT_CLR,
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sts_mask);
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}
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static int sprd_rtc_read_aux_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct sprd_rtc *rtc = dev_get_drvdata(dev);
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time64_t secs;
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u32 val;
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int ret;
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ret = sprd_rtc_get_secs(rtc, SPRD_RTC_AUX_ALARM, &secs);
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if (ret)
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return ret;
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rtc_time64_to_tm(secs, &alrm->time);
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ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_INT_EN, &val);
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if (ret)
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return ret;
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alrm->enabled = !!(val & SPRD_RTC_AUXALM_EN);
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ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_INT_RAW_STS, &val);
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if (ret)
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return ret;
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alrm->pending = !!(val & SPRD_RTC_AUXALM_EN);
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return 0;
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}
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static int sprd_rtc_set_aux_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct sprd_rtc *rtc = dev_get_drvdata(dev);
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time64_t secs = rtc_tm_to_time64(&alrm->time);
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int ret;
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/* clear the auxiliary alarm interrupt status */
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ret = regmap_write(rtc->regmap, rtc->base + SPRD_RTC_INT_CLR,
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SPRD_RTC_AUXALM_EN);
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if (ret)
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return ret;
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ret = sprd_rtc_set_secs(rtc, SPRD_RTC_AUX_ALARM, secs);
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if (ret)
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return ret;
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if (alrm->enabled) {
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ret = regmap_update_bits(rtc->regmap,
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rtc->base + SPRD_RTC_INT_EN,
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SPRD_RTC_AUXALM_EN,
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SPRD_RTC_AUXALM_EN);
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} else {
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ret = regmap_update_bits(rtc->regmap,
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rtc->base + SPRD_RTC_INT_EN,
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SPRD_RTC_AUXALM_EN, 0);
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}
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return ret;
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}
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static int sprd_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct sprd_rtc *rtc = dev_get_drvdata(dev);
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time64_t secs;
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int ret;
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if (!rtc->valid) {
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dev_warn(dev, "RTC values are invalid\n");
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return -EINVAL;
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}
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ret = sprd_rtc_get_secs(rtc, SPRD_RTC_TIME, &secs);
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if (ret)
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return ret;
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rtc_time64_to_tm(secs, tm);
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return 0;
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}
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static int sprd_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct sprd_rtc *rtc = dev_get_drvdata(dev);
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time64_t secs = rtc_tm_to_time64(tm);
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int ret;
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ret = sprd_rtc_set_secs(rtc, SPRD_RTC_TIME, secs);
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if (ret)
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return ret;
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if (!rtc->valid) {
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/* Clear RTC power status firstly */
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ret = regmap_write(rtc->regmap, rtc->base + SPRD_RTC_PWR_CTRL,
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SPRD_RTC_POWER_STS_CLEAR);
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if (ret)
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return ret;
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/*
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* Set RTC power status to indicate now RTC has valid time
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* values.
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*/
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ret = regmap_write(rtc->regmap, rtc->base + SPRD_RTC_PWR_CTRL,
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SPRD_RTC_POWER_STS_VALID);
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if (ret)
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return ret;
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rtc->valid = true;
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}
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return 0;
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}
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static int sprd_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct sprd_rtc *rtc = dev_get_drvdata(dev);
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time64_t secs;
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int ret;
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u32 val;
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/*
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* Before RTC device is registered, it will check to see if there is an
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* alarm already set in RTC hardware, and we always read the normal
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* alarm at this time.
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*
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* Or if aie_timer is enabled, we should get the normal alarm time.
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* Otherwise we should get auxiliary alarm time.
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*/
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if (rtc->rtc && rtc->rtc->registered && rtc->rtc->aie_timer.enabled == 0)
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return sprd_rtc_read_aux_alarm(dev, alrm);
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ret = sprd_rtc_get_secs(rtc, SPRD_RTC_ALARM, &secs);
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if (ret)
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return ret;
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rtc_time64_to_tm(secs, &alrm->time);
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ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_INT_EN, &val);
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if (ret)
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return ret;
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alrm->enabled = !!(val & SPRD_RTC_ALARM_EN);
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ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_INT_RAW_STS, &val);
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if (ret)
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return ret;
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alrm->pending = !!(val & SPRD_RTC_ALARM_EN);
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return 0;
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}
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static int sprd_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct sprd_rtc *rtc = dev_get_drvdata(dev);
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|
time64_t secs = rtc_tm_to_time64(&alrm->time);
|
|
struct rtc_time aie_time =
|
|
rtc_ktime_to_tm(rtc->rtc->aie_timer.node.expires);
|
|
int ret;
|
|
|
|
/*
|
|
* We have 2 groups alarms: normal alarm and auxiliary alarm. Since
|
|
* both normal alarm event and auxiliary alarm event can wake up system
|
|
* from deep sleep, but only alarm event can power up system from power
|
|
* down status. Moreover we do not need to poll about 125ms when
|
|
* updating auxiliary alarm registers. Thus we usually set auxiliary
|
|
* alarm when wake up system from deep sleep, and for other scenarios,
|
|
* we should set normal alarm with polling status.
|
|
*
|
|
* So here we check if the alarm time is set by aie_timer, if yes, we
|
|
* should set normal alarm, if not, we should set auxiliary alarm which
|
|
* means it is just a wake event.
|
|
*/
|
|
if (!rtc->rtc->aie_timer.enabled || rtc_tm_sub(&aie_time, &alrm->time))
|
|
return sprd_rtc_set_aux_alarm(dev, alrm);
|
|
|
|
/* clear the alarm interrupt status firstly */
|
|
ret = regmap_write(rtc->regmap, rtc->base + SPRD_RTC_INT_CLR,
|
|
SPRD_RTC_ALARM_EN);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = sprd_rtc_set_secs(rtc, SPRD_RTC_ALARM, secs);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (alrm->enabled) {
|
|
ret = regmap_update_bits(rtc->regmap,
|
|
rtc->base + SPRD_RTC_INT_EN,
|
|
SPRD_RTC_ALARM_EN,
|
|
SPRD_RTC_ALARM_EN);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* unlock the alarm to enable the alarm function. */
|
|
ret = sprd_rtc_lock_alarm(rtc, false);
|
|
} else {
|
|
regmap_update_bits(rtc->regmap,
|
|
rtc->base + SPRD_RTC_INT_EN,
|
|
SPRD_RTC_ALARM_EN, 0);
|
|
|
|
/*
|
|
* Lock the alarm function in case fake alarm event will power
|
|
* up systems.
|
|
*/
|
|
ret = sprd_rtc_lock_alarm(rtc, true);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int sprd_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
|
|
{
|
|
struct sprd_rtc *rtc = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
if (enabled) {
|
|
ret = regmap_update_bits(rtc->regmap,
|
|
rtc->base + SPRD_RTC_INT_EN,
|
|
SPRD_RTC_ALARM_EN | SPRD_RTC_AUXALM_EN,
|
|
SPRD_RTC_ALARM_EN | SPRD_RTC_AUXALM_EN);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = sprd_rtc_lock_alarm(rtc, false);
|
|
} else {
|
|
regmap_update_bits(rtc->regmap, rtc->base + SPRD_RTC_INT_EN,
|
|
SPRD_RTC_ALARM_EN | SPRD_RTC_AUXALM_EN, 0);
|
|
|
|
ret = sprd_rtc_lock_alarm(rtc, true);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct rtc_class_ops sprd_rtc_ops = {
|
|
.read_time = sprd_rtc_read_time,
|
|
.set_time = sprd_rtc_set_time,
|
|
.read_alarm = sprd_rtc_read_alarm,
|
|
.set_alarm = sprd_rtc_set_alarm,
|
|
.alarm_irq_enable = sprd_rtc_alarm_irq_enable,
|
|
};
|
|
|
|
static irqreturn_t sprd_rtc_handler(int irq, void *dev_id)
|
|
{
|
|
struct sprd_rtc *rtc = dev_id;
|
|
int ret;
|
|
|
|
ret = sprd_rtc_clear_alarm_ints(rtc);
|
|
if (ret)
|
|
return IRQ_RETVAL(ret);
|
|
|
|
rtc_update_irq(rtc->rtc, 1, RTC_AF | RTC_IRQF);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int sprd_rtc_check_power_down(struct sprd_rtc *rtc)
|
|
{
|
|
u32 val;
|
|
int ret;
|
|
|
|
ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_PWR_STS, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* If the RTC power status value is SPRD_RTC_POWER_RESET_VALUE, which
|
|
* means the RTC has been powered down, so the RTC time values are
|
|
* invalid.
|
|
*/
|
|
rtc->valid = val == SPRD_RTC_POWER_RESET_VALUE ? false : true;
|
|
return 0;
|
|
}
|
|
|
|
static int sprd_rtc_check_alarm_int(struct sprd_rtc *rtc)
|
|
{
|
|
u32 val;
|
|
int ret;
|
|
|
|
ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_SPG_VALUE, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* The SPRD_RTC_INT_EN register is not put in always-power-on region
|
|
* supplied by VDDRTC, so we should check if we need enable the alarm
|
|
* interrupt when system booting.
|
|
*
|
|
* If we have set SPRD_RTC_POWEROFF_ALM_FLAG which is saved in
|
|
* always-power-on region, that means we have set one alarm last time,
|
|
* so we should enable the alarm interrupt to help RTC core to see if
|
|
* there is an alarm already set in RTC hardware.
|
|
*/
|
|
if (!(val & SPRD_RTC_POWEROFF_ALM_FLAG))
|
|
return 0;
|
|
|
|
return regmap_update_bits(rtc->regmap, rtc->base + SPRD_RTC_INT_EN,
|
|
SPRD_RTC_ALARM_EN, SPRD_RTC_ALARM_EN);
|
|
}
|
|
|
|
static int sprd_rtc_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *node = pdev->dev.of_node;
|
|
struct sprd_rtc *rtc;
|
|
int ret;
|
|
|
|
rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
|
|
if (!rtc)
|
|
return -ENOMEM;
|
|
|
|
rtc->regmap = dev_get_regmap(pdev->dev.parent, NULL);
|
|
if (!rtc->regmap)
|
|
return -ENODEV;
|
|
|
|
ret = of_property_read_u32(node, "reg", &rtc->base);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to get RTC base address\n");
|
|
return ret;
|
|
}
|
|
|
|
rtc->irq = platform_get_irq(pdev, 0);
|
|
if (rtc->irq < 0)
|
|
return rtc->irq;
|
|
|
|
rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
|
|
if (IS_ERR(rtc->rtc))
|
|
return PTR_ERR(rtc->rtc);
|
|
|
|
rtc->dev = &pdev->dev;
|
|
platform_set_drvdata(pdev, rtc);
|
|
|
|
/* check if we need set the alarm interrupt */
|
|
ret = sprd_rtc_check_alarm_int(rtc);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to check RTC alarm interrupt\n");
|
|
return ret;
|
|
}
|
|
|
|
/* check if RTC time values are valid */
|
|
ret = sprd_rtc_check_power_down(rtc);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to check RTC time values\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
|
|
sprd_rtc_handler,
|
|
IRQF_ONESHOT | IRQF_EARLY_RESUME,
|
|
pdev->name, rtc);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "failed to request RTC irq\n");
|
|
return ret;
|
|
}
|
|
|
|
device_init_wakeup(&pdev->dev, 1);
|
|
|
|
rtc->rtc->ops = &sprd_rtc_ops;
|
|
rtc->rtc->range_min = 0;
|
|
rtc->rtc->range_max = 5662310399LL;
|
|
ret = rtc_register_device(rtc->rtc);
|
|
if (ret) {
|
|
device_init_wakeup(&pdev->dev, 0);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id sprd_rtc_of_match[] = {
|
|
{ .compatible = "sprd,sc2731-rtc", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, sprd_rtc_of_match);
|
|
|
|
static struct platform_driver sprd_rtc_driver = {
|
|
.driver = {
|
|
.name = "sprd-rtc",
|
|
.of_match_table = sprd_rtc_of_match,
|
|
},
|
|
.probe = sprd_rtc_probe,
|
|
};
|
|
module_platform_driver(sprd_rtc_driver);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("Spreadtrum RTC Device Driver");
|
|
MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");
|