rtc: s5m: add support for S2MPS14 RTC

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>

2 files changed, 86 insertions, 19 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 71988b69eca6..0754f5c7cb3b 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -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.
diff --git a/drivers/rtc/rtc-s5m.c b/drivers/rtc/rtc-s5m.c
index 59860128a221..76287ebd0e35 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 i2c_client *i2c;
@@ -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;
         }
@@ -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) {
@@ -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) {
@@ -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)
@@ -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;
 
@@ -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:
@@ -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++) {
@@ -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;
 
@@ -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;
@@ -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;
 
@@ -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);
@@ -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;
@@ -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);
@@ -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 = {
@@ -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");