[PATCH 14/14] rtc: s5m: Add support for S2MPS14 RTC

Krzysztof Kozlowski
2014-02-11T13:03:57Z

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;

This patch also adds missing mfd_cell for RTC in the MFD core driver.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: rtc-linux@googlegroups.com
---
drivers/rtc/rtc-s5m.c | 89 +++++++++++++++++++++++++++++++++++++++++++------
1 file changed, 78 insertions(+), 11 deletions(-)

diff --git a/drivers/rtc/rtc-s5m.c b/drivers/rtc/rtc-s5m.c
index 6a1290f8709a..6e4faffe4b5b 100644
--- a/drivers/rtc/rtc-s5m.c
+++ b/drivers/rtc/rtc-s5m.c
@@ -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
@@ -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 sec_pmic_dev *s5m87xx;
@@ -163,6 +176,11 @@ 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;
}
@@ -188,8 +206,9 @@ 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) {
@@ -214,8 +233,18 @@ 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) {
@@ -267,6 +296,17 @@ 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)
@@ -278,6 +318,7 @@ 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;

@@ -303,6 +344,7 @@ 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:
@@ -349,6 +391,7 @@ 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++) {
@@ -396,6 +439,7 @@ 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;

@@ -439,6 +483,7 @@ 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;
@@ -477,6 +522,7 @@ 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;

@@ -563,12 +609,26 @@ static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info)
u8 data[2];
int 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);
+ switch (info->device_type) {
+ case S5M8763X:
+ case S5M8767X:
+ /* 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);
@@ -613,6 +673,12 @@ static int s5m_rtc_probe(struct platform_device *pdev)
info->regs = &s5m_rtc_regs;
break;

+ case S2MPS14X:
+ info->irq = regmap_irq_get_virq(s5m87xx->irq_data,
+ S2MPS14_IRQ_RTCA0);
+ info->regs = &s2mps_rtc_regs;
+ break;
+
default:
ret = -EINVAL;
dev_err(&pdev->dev, "Unsupported device type: %d\n", ret);
@@ -697,7 +763,8 @@ 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 = {
@@ -715,6 +782,6 @@ 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");
--
1.7.9.5