| /* |
| * Copyright (C) 2017 Spreadtrum Communications Inc. |
| * |
| * SPDX-License-Identifier: GPL-2.0 |
| */ |
| |
| #include <linux/bitops.h> |
| #include <linux/delay.h> |
| #include <linux/err.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/platform_device.h> |
| #include <linux/regmap.h> |
| #include <linux/rtc.h> |
| |
| #define SPRD_RTC_SEC_CNT_VALUE 0x0 |
| #define SPRD_RTC_MIN_CNT_VALUE 0x4 |
| #define SPRD_RTC_HOUR_CNT_VALUE 0x8 |
| #define SPRD_RTC_DAY_CNT_VALUE 0xc |
| #define SPRD_RTC_SEC_CNT_UPD 0x10 |
| #define SPRD_RTC_MIN_CNT_UPD 0x14 |
| #define SPRD_RTC_HOUR_CNT_UPD 0x18 |
| #define SPRD_RTC_DAY_CNT_UPD 0x1c |
| #define SPRD_RTC_SEC_ALM_UPD 0x20 |
| #define SPRD_RTC_MIN_ALM_UPD 0x24 |
| #define SPRD_RTC_HOUR_ALM_UPD 0x28 |
| #define SPRD_RTC_DAY_ALM_UPD 0x2c |
| #define SPRD_RTC_INT_EN 0x30 |
| #define SPRD_RTC_INT_RAW_STS 0x34 |
| #define SPRD_RTC_INT_CLR 0x38 |
| #define SPRD_RTC_INT_MASK_STS 0x3C |
| #define SPRD_RTC_SEC_ALM_VALUE 0x40 |
| #define SPRD_RTC_MIN_ALM_VALUE 0x44 |
| #define SPRD_RTC_HOUR_ALM_VALUE 0x48 |
| #define SPRD_RTC_DAY_ALM_VALUE 0x4c |
| #define SPRD_RTC_SPG_VALUE 0x50 |
| #define SPRD_RTC_SPG_UPD 0x54 |
| #define SPRD_RTC_PWR_CTRL 0x58 |
| #define SPRD_RTC_PWR_STS 0x5c |
| #define SPRD_RTC_SEC_AUXALM_UPD 0x60 |
| #define SPRD_RTC_MIN_AUXALM_UPD 0x64 |
| #define SPRD_RTC_HOUR_AUXALM_UPD 0x68 |
| #define SPRD_RTC_DAY_AUXALM_UPD 0x6c |
| |
| /* BIT & MASK definition for SPRD_RTC_INT_* registers */ |
| #define SPRD_RTC_SEC_EN BIT(0) |
| #define SPRD_RTC_MIN_EN BIT(1) |
| #define SPRD_RTC_HOUR_EN BIT(2) |
| #define SPRD_RTC_DAY_EN BIT(3) |
| #define SPRD_RTC_ALARM_EN BIT(4) |
| #define SPRD_RTC_HRS_FORMAT_EN BIT(5) |
| #define SPRD_RTC_AUXALM_EN BIT(6) |
| #define SPRD_RTC_SPG_UPD_EN BIT(7) |
| #define SPRD_RTC_SEC_UPD_EN BIT(8) |
| #define SPRD_RTC_MIN_UPD_EN BIT(9) |
| #define SPRD_RTC_HOUR_UPD_EN BIT(10) |
| #define SPRD_RTC_DAY_UPD_EN BIT(11) |
| #define SPRD_RTC_ALMSEC_UPD_EN BIT(12) |
| #define SPRD_RTC_ALMMIN_UPD_EN BIT(13) |
| #define SPRD_RTC_ALMHOUR_UPD_EN BIT(14) |
| #define SPRD_RTC_ALMDAY_UPD_EN BIT(15) |
| #define SPRD_RTC_INT_MASK GENMASK(15, 0) |
| |
| #define SPRD_RTC_TIME_INT_MASK \ |
| (SPRD_RTC_SEC_UPD_EN | SPRD_RTC_MIN_UPD_EN | \ |
| SPRD_RTC_HOUR_UPD_EN | SPRD_RTC_DAY_UPD_EN) |
| |
| #define SPRD_RTC_ALMTIME_INT_MASK \ |
| (SPRD_RTC_ALMSEC_UPD_EN | SPRD_RTC_ALMMIN_UPD_EN | \ |
| SPRD_RTC_ALMHOUR_UPD_EN | SPRD_RTC_ALMDAY_UPD_EN) |
| |
| #define SPRD_RTC_ALM_INT_MASK \ |
| (SPRD_RTC_SEC_EN | SPRD_RTC_MIN_EN | \ |
| SPRD_RTC_HOUR_EN | SPRD_RTC_DAY_EN | \ |
| SPRD_RTC_ALARM_EN | SPRD_RTC_AUXALM_EN) |
| |
| /* second/minute/hour/day values mask definition */ |
| #define SPRD_RTC_SEC_MASK GENMASK(5, 0) |
| #define SPRD_RTC_MIN_MASK GENMASK(5, 0) |
| #define SPRD_RTC_HOUR_MASK GENMASK(4, 0) |
| #define SPRD_RTC_DAY_MASK GENMASK(15, 0) |
| |
| /* alarm lock definition for SPRD_RTC_SPG_UPD register */ |
| #define SPRD_RTC_ALMLOCK_MASK GENMASK(7, 0) |
| #define SPRD_RTC_ALM_UNLOCK 0xa5 |
| #define SPRD_RTC_ALM_LOCK (~SPRD_RTC_ALM_UNLOCK & \ |
| SPRD_RTC_ALMLOCK_MASK) |
| |
| /* SPG values definition for SPRD_RTC_SPG_UPD register */ |
| #define SPRD_RTC_POWEROFF_ALM_FLAG BIT(8) |
| |
| /* power control/status definition */ |
| #define SPRD_RTC_POWER_RESET_VALUE 0x96 |
| #define SPRD_RTC_POWER_STS_CLEAR GENMASK(7, 0) |
| #define SPRD_RTC_POWER_STS_SHIFT 8 |
| #define SPRD_RTC_POWER_STS_VALID \ |
| (~SPRD_RTC_POWER_RESET_VALUE << SPRD_RTC_POWER_STS_SHIFT) |
| |
| /* timeout of synchronizing time and alarm registers (us) */ |
| #define SPRD_RTC_POLL_TIMEOUT 200000 |
| #define SPRD_RTC_POLL_DELAY_US 20000 |
| |
| struct sprd_rtc { |
| struct rtc_device *rtc; |
| struct regmap *regmap; |
| struct device *dev; |
| u32 base; |
| int irq; |
| bool valid; |
| }; |
| |
| /* |
| * The Spreadtrum RTC controller has 3 groups registers, including time, normal |
| * alarm and auxiliary alarm. The time group registers are used to set RTC time, |
| * the normal alarm registers are used to set normal alarm, and the auxiliary |
| * alarm registers are used to set auxiliary alarm. Both 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. |
| */ |
| enum sprd_rtc_reg_types { |
| SPRD_RTC_TIME, |
| SPRD_RTC_ALARM, |
| SPRD_RTC_AUX_ALARM, |
| }; |
| |
| static int sprd_rtc_clear_alarm_ints(struct sprd_rtc *rtc) |
| { |
| return regmap_write(rtc->regmap, rtc->base + SPRD_RTC_INT_CLR, |
| SPRD_RTC_ALM_INT_MASK); |
| } |
| |
| static int sprd_rtc_lock_alarm(struct sprd_rtc *rtc, bool lock) |
| { |
| int ret; |
| u32 val; |
| |
| ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_SPG_VALUE, &val); |
| if (ret) |
| return ret; |
| |
| val &= ~SPRD_RTC_ALMLOCK_MASK; |
| if (lock) |
| val |= SPRD_RTC_ALM_LOCK; |
| else |
| val |= SPRD_RTC_ALM_UNLOCK | SPRD_RTC_POWEROFF_ALM_FLAG; |
| |
| ret = regmap_write(rtc->regmap, rtc->base + SPRD_RTC_SPG_UPD, val); |
| if (ret) |
| return ret; |
| |
| /* wait until the SPG value is updated successfully */ |
| ret = regmap_read_poll_timeout(rtc->regmap, |
| rtc->base + SPRD_RTC_INT_RAW_STS, val, |
| (val & SPRD_RTC_SPG_UPD_EN), |
| SPRD_RTC_POLL_DELAY_US, |
| SPRD_RTC_POLL_TIMEOUT); |
| if (ret) { |
| dev_err(rtc->dev, "failed to update SPG value:%d\n", ret); |
| return ret; |
| } |
| |
| return regmap_write(rtc->regmap, rtc->base + SPRD_RTC_INT_CLR, |
| SPRD_RTC_SPG_UPD_EN); |
| } |
| |
| static int sprd_rtc_get_secs(struct sprd_rtc *rtc, enum sprd_rtc_reg_types type, |
| time64_t *secs) |
| { |
| u32 sec_reg, min_reg, hour_reg, day_reg; |
| u32 val, sec, min, hour, day; |
| int ret; |
| |
| switch (type) { |
| case SPRD_RTC_TIME: |
| sec_reg = SPRD_RTC_SEC_CNT_VALUE; |
| min_reg = SPRD_RTC_MIN_CNT_VALUE; |
| hour_reg = SPRD_RTC_HOUR_CNT_VALUE; |
| day_reg = SPRD_RTC_DAY_CNT_VALUE; |
| break; |
| case SPRD_RTC_ALARM: |
| sec_reg = SPRD_RTC_SEC_ALM_VALUE; |
| min_reg = SPRD_RTC_MIN_ALM_VALUE; |
| hour_reg = SPRD_RTC_HOUR_ALM_VALUE; |
| day_reg = SPRD_RTC_DAY_ALM_VALUE; |
| break; |
| case SPRD_RTC_AUX_ALARM: |
| sec_reg = SPRD_RTC_SEC_AUXALM_UPD; |
| min_reg = SPRD_RTC_MIN_AUXALM_UPD; |
| hour_reg = SPRD_RTC_HOUR_AUXALM_UPD; |
| day_reg = SPRD_RTC_DAY_AUXALM_UPD; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| ret = regmap_read(rtc->regmap, rtc->base + sec_reg, &val); |
| if (ret) |
| return ret; |
| |
| sec = val & SPRD_RTC_SEC_MASK; |
| |
| ret = regmap_read(rtc->regmap, rtc->base + min_reg, &val); |
| if (ret) |
| return ret; |
| |
| min = val & SPRD_RTC_MIN_MASK; |
| |
| ret = regmap_read(rtc->regmap, rtc->base + hour_reg, &val); |
| if (ret) |
| return ret; |
| |
| hour = val & SPRD_RTC_HOUR_MASK; |
| |
| ret = regmap_read(rtc->regmap, rtc->base + day_reg, &val); |
| if (ret) |
| return ret; |
| |
| day = val & SPRD_RTC_DAY_MASK; |
| *secs = (((time64_t)(day * 24) + hour) * 60 + min) * 60 + sec; |
| return 0; |
| } |
| |
| static int sprd_rtc_set_secs(struct sprd_rtc *rtc, enum sprd_rtc_reg_types type, |
| time64_t secs) |
| { |
| u32 sec_reg, min_reg, hour_reg, day_reg, sts_mask; |
| u32 sec, min, hour, day, val; |
| int ret, rem; |
| |
| /* convert seconds to RTC time format */ |
| day = div_s64_rem(secs, 86400, &rem); |
| hour = rem / 3600; |
| rem -= hour * 3600; |
| min = rem / 60; |
| sec = rem - min * 60; |
| |
| switch (type) { |
| case SPRD_RTC_TIME: |
| sec_reg = SPRD_RTC_SEC_CNT_UPD; |
| min_reg = SPRD_RTC_MIN_CNT_UPD; |
| hour_reg = SPRD_RTC_HOUR_CNT_UPD; |
| day_reg = SPRD_RTC_DAY_CNT_UPD; |
| sts_mask = SPRD_RTC_TIME_INT_MASK; |
| break; |
| case SPRD_RTC_ALARM: |
| sec_reg = SPRD_RTC_SEC_ALM_UPD; |
| min_reg = SPRD_RTC_MIN_ALM_UPD; |
| hour_reg = SPRD_RTC_HOUR_ALM_UPD; |
| day_reg = SPRD_RTC_DAY_ALM_UPD; |
| sts_mask = SPRD_RTC_ALMTIME_INT_MASK; |
| break; |
| case SPRD_RTC_AUX_ALARM: |
| sec_reg = SPRD_RTC_SEC_AUXALM_UPD; |
| min_reg = SPRD_RTC_MIN_AUXALM_UPD; |
| hour_reg = SPRD_RTC_HOUR_AUXALM_UPD; |
| day_reg = SPRD_RTC_DAY_AUXALM_UPD; |
| sts_mask = 0; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| ret = regmap_write(rtc->regmap, rtc->base + sec_reg, sec); |
| if (ret) |
| return ret; |
| |
| ret = regmap_write(rtc->regmap, rtc->base + min_reg, min); |
| if (ret) |
| return ret; |
| |
| ret = regmap_write(rtc->regmap, rtc->base + hour_reg, hour); |
| if (ret) |
| return ret; |
| |
| ret = regmap_write(rtc->regmap, rtc->base + day_reg, day); |
| if (ret) |
| return ret; |
| |
| if (type == SPRD_RTC_AUX_ALARM) |
| return 0; |
| |
| /* |
| * Since the time and normal alarm registers are put in always-power-on |
| * region supplied by VDDRTC, then these registers changing time will |
| * be very long, about 125ms. Thus here we should wait until all |
| * values are updated successfully. |
| */ |
| ret = regmap_read_poll_timeout(rtc->regmap, |
| rtc->base + SPRD_RTC_INT_RAW_STS, val, |
| ((val & sts_mask) == sts_mask), |
| SPRD_RTC_POLL_DELAY_US, |
| SPRD_RTC_POLL_TIMEOUT); |
| if (ret < 0) { |
| dev_err(rtc->dev, "set time/alarm values timeout\n"); |
| return ret; |
| } |
| |
| return regmap_write(rtc->regmap, rtc->base + SPRD_RTC_INT_CLR, |
| sts_mask); |
| } |
| |
| static int sprd_rtc_read_aux_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
| { |
| struct sprd_rtc *rtc = dev_get_drvdata(dev); |
| time64_t secs; |
| u32 val; |
| int ret; |
| |
| ret = sprd_rtc_get_secs(rtc, SPRD_RTC_AUX_ALARM, &secs); |
| if (ret) |
| return ret; |
| |
| rtc_time64_to_tm(secs, &alrm->time); |
| |
| ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_INT_EN, &val); |
| if (ret) |
| return ret; |
| |
| alrm->enabled = !!(val & SPRD_RTC_AUXALM_EN); |
| |
| ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_INT_RAW_STS, &val); |
| if (ret) |
| return ret; |
| |
| alrm->pending = !!(val & SPRD_RTC_AUXALM_EN); |
| return 0; |
| } |
| |
| static int sprd_rtc_set_aux_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
| { |
| struct sprd_rtc *rtc = dev_get_drvdata(dev); |
| time64_t secs = rtc_tm_to_time64(&alrm->time); |
| int ret; |
| |
| /* clear the auxiliary alarm interrupt status */ |
| ret = regmap_write(rtc->regmap, rtc->base + SPRD_RTC_INT_CLR, |
| SPRD_RTC_AUXALM_EN); |
| if (ret) |
| return ret; |
| |
| ret = sprd_rtc_set_secs(rtc, SPRD_RTC_AUX_ALARM, secs); |
| if (ret) |
| return ret; |
| |
| if (alrm->enabled) { |
| ret = regmap_update_bits(rtc->regmap, |
| rtc->base + SPRD_RTC_INT_EN, |
| SPRD_RTC_AUXALM_EN, |
| SPRD_RTC_AUXALM_EN); |
| } else { |
| ret = regmap_update_bits(rtc->regmap, |
| rtc->base + SPRD_RTC_INT_EN, |
| SPRD_RTC_AUXALM_EN, 0); |
| } |
| |
| return ret; |
| } |
| |
| static int sprd_rtc_read_time(struct device *dev, struct rtc_time *tm) |
| { |
| struct sprd_rtc *rtc = dev_get_drvdata(dev); |
| time64_t secs; |
| int ret; |
| |
| if (!rtc->valid) { |
| dev_warn(dev, "RTC values are invalid\n"); |
| return -EINVAL; |
| } |
| |
| ret = sprd_rtc_get_secs(rtc, SPRD_RTC_TIME, &secs); |
| if (ret) |
| return ret; |
| |
| rtc_time64_to_tm(secs, tm); |
| return 0; |
| } |
| |
| static int sprd_rtc_set_time(struct device *dev, struct rtc_time *tm) |
| { |
| struct sprd_rtc *rtc = dev_get_drvdata(dev); |
| time64_t secs = rtc_tm_to_time64(tm); |
| int ret; |
| |
| ret = sprd_rtc_set_secs(rtc, SPRD_RTC_TIME, secs); |
| if (ret) |
| return ret; |
| |
| if (!rtc->valid) { |
| /* Clear RTC power status firstly */ |
| ret = regmap_write(rtc->regmap, rtc->base + SPRD_RTC_PWR_CTRL, |
| SPRD_RTC_POWER_STS_CLEAR); |
| if (ret) |
| return ret; |
| |
| /* |
| * Set RTC power status to indicate now RTC has valid time |
| * values. |
| */ |
| ret = regmap_write(rtc->regmap, rtc->base + SPRD_RTC_PWR_CTRL, |
| SPRD_RTC_POWER_STS_VALID); |
| if (ret) |
| return ret; |
| |
| rtc->valid = true; |
| } |
| |
| return 0; |
| } |
| |
| static int sprd_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
| { |
| struct sprd_rtc *rtc = dev_get_drvdata(dev); |
| time64_t secs; |
| int ret; |
| u32 val; |
| |
| /* |
| * Before RTC device is registered, it will check to see if there is an |
| * alarm already set in RTC hardware, and we always read the normal |
| * alarm at this time. |
| * |
| * Or if aie_timer is enabled, we should get the normal alarm time. |
| * Otherwise we should get auxiliary alarm time. |
| */ |
| if (rtc->rtc && rtc->rtc->registered && rtc->rtc->aie_timer.enabled == 0) |
| return sprd_rtc_read_aux_alarm(dev, alrm); |
| |
| ret = sprd_rtc_get_secs(rtc, SPRD_RTC_ALARM, &secs); |
| if (ret) |
| return ret; |
| |
| rtc_time64_to_tm(secs, &alrm->time); |
| |
| ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_INT_EN, &val); |
| if (ret) |
| return ret; |
| |
| alrm->enabled = !!(val & SPRD_RTC_ALARM_EN); |
| |
| ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_INT_RAW_STS, &val); |
| if (ret) |
| return ret; |
| |
| alrm->pending = !!(val & SPRD_RTC_ALARM_EN); |
| return 0; |
| } |
| |
| static int sprd_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
| { |
| struct sprd_rtc *rtc = dev_get_drvdata(dev); |
| 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>"); |