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rtc: s5m: add support for S2MPS14 RTC
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Add support for S2MPS14 to the rtc-s5m driver.  Differences in S2MPS14
(in comparison to S5M8767):

 - Layout of registers
 - Lack of century support for time and alarms (7 registers used for
   storing time/alarm)
 - Two buffer control registers: WUDR and RUDR
 - No register for enabling writing time
 - RTC interrupts are reported in main PMIC I2C device

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Sangbeom Kim <sbkim73@samsung.com>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@krzk @torvalds
krzk authored and torvalds committed Jun 10, 2014
1 parent f8b23bb commit 0c5deb1
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Showing 2 changed files with 86 additions and 19 deletions.
4 changes: 2 additions & 2 deletions drivers/rtc/Kconfig
View file
Original file line number Diff line number Diff line change
Expand Up @@ -530,11 +530,11 @@ config RTC_DRV_RV3029C2
will be called rtc-rv3029c2.

config RTC_DRV_S5M
tristate "Samsung S5M series"
tristate "Samsung S2M/S5M series"
depends on MFD_SEC_CORE
help
If you say yes here you will get support for the
RTC of Samsung S5M PMIC series.
RTC of Samsung S2MPS14 and S5M PMIC series.

This driver can also be built as a module. If so, the module
will be called rtc-s5m.
Expand Down
101 changes: 84 additions & 17 deletions drivers/rtc/rtc-s5m.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -17,16 +17,14 @@

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/bcd.h>
#include <linux/bitops.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/mfd/samsung/core.h>
#include <linux/mfd/samsung/irq.h>
#include <linux/mfd/samsung/rtc.h>
#include <linux/mfd/samsung/s2mps14.h>

/*
* Maximum number of retries for checking changes in UDR field
Expand Down Expand Up @@ -74,6 +72,21 @@ static const struct s5m_rtc_reg_config s5m_rtc_regs = {
.rtc_udr_mask = S5M_RTC_UDR_MASK,
};

/*
* Register map for S2MPS14.
* It may be also suitable for S2MPS11 but this was not tested.
*/
static const struct s5m_rtc_reg_config s2mps_rtc_regs = {
.regs_count = 7,
.time = S2MPS_RTC_SEC,
.ctrl = S2MPS_RTC_CTRL,
.alarm0 = S2MPS_ALARM0_SEC,
.alarm1 = S2MPS_ALARM1_SEC,
.smpl_wtsr = S2MPS_WTSR_SMPL_CNTL,
.rtc_udr_update = S2MPS_RTC_UDR_CON,
.rtc_udr_mask = S2MPS_RTC_WUDR_MASK,
};

struct s5m_rtc_info {
struct device *dev;
struct i2c_client *i2c;
Expand Down Expand Up @@ -178,6 +191,11 @@ static inline int s5m_check_peding_alarm_interrupt(struct s5m_rtc_info *info,
ret = regmap_read(info->regmap, S5M_RTC_STATUS, &val);
val &= S5M_ALARM0_STATUS;
break;
case S2MPS14X:
ret = regmap_read(info->s5m87xx->regmap_pmic, S2MPS14_REG_ST2,
&val);
val &= S2MPS_ALARM0_STATUS;
break;
default:
return -EINVAL;
}
Expand All @@ -203,8 +221,9 @@ static inline int s5m8767_rtc_set_time_reg(struct s5m_rtc_info *info)
return ret;
}

data |= S5M_RTC_TIME_EN_MASK;
data |= info->regs->rtc_udr_mask;
if (info->device_type == S5M8763X || info->device_type == S5M8767X)
data |= S5M_RTC_TIME_EN_MASK;

ret = regmap_write(info->regmap, info->regs->rtc_udr_update, data);
if (ret < 0) {
Expand All @@ -229,8 +248,18 @@ static inline int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info)
return ret;
}

data &= ~S5M_RTC_TIME_EN_MASK;
data |= info->regs->rtc_udr_mask;
switch (info->device_type) {
case S5M8763X:
case S5M8767X:
data &= ~S5M_RTC_TIME_EN_MASK;
break;
case S2MPS14X:
data |= S2MPS_RTC_RUDR_MASK;
break;
default:
return -EINVAL;
}

ret = regmap_write(info->regmap, info->regs->rtc_udr_update, data);
if (ret < 0) {
Expand Down Expand Up @@ -282,6 +311,17 @@ static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm)
u8 data[info->regs->regs_count];
int ret;

if (info->device_type == S2MPS14X) {
ret = regmap_update_bits(info->regmap,
info->regs->rtc_udr_update,
S2MPS_RTC_RUDR_MASK, S2MPS_RTC_RUDR_MASK);
if (ret) {
dev_err(dev,
"Failed to prepare registers for time reading: %d\n",
ret);
return ret;
}
}
ret = regmap_bulk_read(info->regmap, info->regs->time, data,
info->regs->regs_count);
if (ret < 0)
Expand All @@ -293,6 +333,7 @@ static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm)
break;

case S5M8767X:
case S2MPS14X:
s5m8767_data_to_tm(data, tm, info->rtc_24hr_mode);
break;

Expand All @@ -318,6 +359,7 @@ static int s5m_rtc_set_time(struct device *dev, struct rtc_time *tm)
s5m8763_tm_to_data(tm, data);
break;
case S5M8767X:
case S2MPS14X:
ret = s5m8767_tm_to_data(tm, data);
break;
default:
Expand Down Expand Up @@ -364,6 +406,7 @@ static int s5m_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
break;

case S5M8767X:
case S2MPS14X:
s5m8767_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
alrm->enabled = 0;
for (i = 0; i < info->regs->regs_count; i++) {
Expand Down Expand Up @@ -411,6 +454,7 @@ static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info)
break;

case S5M8767X:
case S2MPS14X:
for (i = 0; i < info->regs->regs_count; i++)
data[i] &= ~ALARM_ENABLE_MASK;

Expand Down Expand Up @@ -454,6 +498,7 @@ static int s5m_rtc_start_alarm(struct s5m_rtc_info *info)
break;

case S5M8767X:
case S2MPS14X:
data[RTC_SEC] |= ALARM_ENABLE_MASK;
data[RTC_MIN] |= ALARM_ENABLE_MASK;
data[RTC_HOUR] |= ALARM_ENABLE_MASK;
Expand Down Expand Up @@ -492,6 +537,7 @@ static int s5m_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
break;

case S5M8767X:
case S2MPS14X:
s5m8767_tm_to_data(&alrm->time, data);
break;

Expand Down Expand Up @@ -578,19 +624,33 @@ static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info)
u8 data[2];
int ret;

/* UDR update time. Default of 7.32 ms is too long. */
ret = regmap_update_bits(info->regmap, S5M_RTC_UDR_CON,
S5M_RTC_UDR_T_MASK, S5M_RTC_UDR_T_450_US);
if (ret < 0)
dev_err(info->dev, "%s: fail to change UDR time: %d\n",
__func__, ret);
switch (info->device_type) {
case S5M8763X:
case S5M8767X:
/* UDR update time. Default of 7.32 ms is too long. */
ret = regmap_update_bits(info->regmap, S5M_RTC_UDR_CON,
S5M_RTC_UDR_T_MASK, S5M_RTC_UDR_T_450_US);
if (ret < 0)
dev_err(info->dev, "%s: fail to change UDR time: %d\n",
__func__, ret);

/* Set RTC control register : Binary mode, 24hour mode */
data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
/* Set RTC control register : Binary mode, 24hour mode */
data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);

ret = regmap_raw_write(info->regmap, S5M_ALARM0_CONF, data, 2);
break;

case S2MPS14X:
data[0] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
ret = regmap_write(info->regmap, info->regs->ctrl, data[0]);
break;

default:
return -EINVAL;
}

info->rtc_24hr_mode = 1;
ret = regmap_raw_write(info->regmap, S5M_ALARM0_CONF, data, 2);
if (ret < 0) {
dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
__func__, ret);
Expand Down Expand Up @@ -620,6 +680,7 @@ static int s5m_rtc_probe(struct platform_device *pdev)
switch (pdata->device_type) {
case S2MPS14X:
regmap_cfg = &s2mps14_rtc_regmap_config;
info->regs = &s2mps_rtc_regs;
break;
case S5M8763X:
regmap_cfg = &s5m_rtc_regmap_config;
Expand Down Expand Up @@ -654,6 +715,11 @@ static int s5m_rtc_probe(struct platform_device *pdev)
info->wtsr_smpl = s5m87xx->wtsr_smpl;

switch (pdata->device_type) {
case S2MPS14X:
info->irq = regmap_irq_get_virq(s5m87xx->irq_data,
S2MPS14_IRQ_RTCA0);
break;

case S5M8763X:
info->irq = regmap_irq_get_virq(s5m87xx->irq_data,
S5M8763_IRQ_ALARM0);
Expand Down Expand Up @@ -768,7 +834,8 @@ static int s5m_rtc_suspend(struct device *dev)
static SIMPLE_DEV_PM_OPS(s5m_rtc_pm_ops, s5m_rtc_suspend, s5m_rtc_resume);

static const struct platform_device_id s5m_rtc_id[] = {
{ "s5m-rtc", 0 },
{ "s5m-rtc", S5M8767X },
{ "s2mps14-rtc", S2MPS14X },
};

static struct platform_driver s5m_rtc_driver = {
Expand All @@ -787,6 +854,6 @@ module_platform_driver(s5m_rtc_driver);

/* Module information */
MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
MODULE_DESCRIPTION("Samsung S5M RTC driver");
MODULE_DESCRIPTION("Samsung S5M/S2MPS14 RTC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:s5m-rtc");

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