forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
647 lines
17 KiB
647 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* Copyright (C) 2017 Spreadtrum Communications Inc. |
|
* |
|
*/ |
|
|
|
#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_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; |
|
|
|
/* |
|
* The RTC core checks to see if there is an alarm already set in RTC |
|
* hardware, and we always read the normal alarm at this time. |
|
*/ |
|
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; |
|
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 = devm_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 <[email protected]>");
|
|
|