mfd: ab8500-sysctrl: Add new reset function

Add a new reset function which uses the AB WD with 0 timeout.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>

2 files changed, 69 insertions, 0 deletions

diff --git a/drivers/mfd/ab8500-sysctrl.c b/drivers/mfd/ab8500-sysctrl.c
index 6ac63a05893c..f43c42b9f32c 100644
--- a/drivers/mfd/ab8500-sysctrl.c
+++ b/drivers/mfd/ab8500-sysctrl.c
@@ -15,6 +15,12 @@
 #include <linux/mfd/abx500/ab8500.h>
 #include <linux/mfd/abx500/ab8500-sysctrl.h>
 
+/* RtcCtrl bits */
+#define AB8500_ALARM_MIN_LOW  0x08
+#define AB8500_ALARM_MIN_MID 0x09
+#define RTC_CTRL 0x0B
+#define RTC_ALARM_ENABLE 0x4
+
 static struct device *sysctrl_dev;
 
 void ab8500_power_off(void)
@@ -79,6 +85,63 @@ shutdown:
         }
 }
 
+/*
+ * Use the AB WD to reset the platform. It will perform a hard
+ * reset instead of a soft reset. Write the reset reason to
+ * the AB before reset, which can be read upon restart.
+ */
+void ab8500_restart(char mode, const char *cmd)
+{
+        struct ab8500_platform_data *plat;
+        struct ab8500_sysctrl_platform_data *pdata;
+        u16 reason = 0;
+        u8 val;
+
+        if (sysctrl_dev == NULL) {
+                pr_err("%s: sysctrl not initialized\n", __func__);
+                return;
+        }
+
+        plat = dev_get_platdata(sysctrl_dev->parent);
+        pdata = plat->sysctrl;
+        if (pdata->reboot_reason_code)
+                reason = pdata->reboot_reason_code(cmd);
+        else
+                pr_warn("[%s] No reboot reason set. Default reason %d\n",
+                        __func__, reason);
+
+        /*
+         * Disable RTC alarm, just a precaution so that no alarm
+         * is running when WD reset is executed.
+         */
+        abx500_get_register_interruptible(sysctrl_dev, AB8500_RTC,
+                RTC_CTRL , &val);
+        abx500_set_register_interruptible(sysctrl_dev, AB8500_RTC,
+                RTC_CTRL , (val & ~RTC_ALARM_ENABLE));
+
+        /*
+         * Android is not using the RTC alarm registers during reboot
+         * so we borrow them for writing the reason of reset
+         */
+
+        /* reason[8 LSB] */
+        val = reason & 0xFF;
+        abx500_set_register_interruptible(sysctrl_dev, AB8500_RTC,
+                AB8500_ALARM_MIN_LOW , val);
+
+        /* reason[8 MSB] */
+        val = (reason>>8) & 0xFF;
+        abx500_set_register_interruptible(sysctrl_dev, AB8500_RTC,
+                AB8500_ALARM_MIN_MID , val);
+
+        /* Setting WD timeout to 0 */
+        ab8500_sysctrl_write(AB8500_MAINWDOGTIMER, 0xFF, 0x0);
+
+        /* Setting the parameters to AB8500 WD*/
+        ab8500_sysctrl_write(AB8500_MAINWDOGCTRL, 0xFF, (AB8500_ENABLE_WD |
+                AB8500_WD_RESTART_ON_EXPIRE | AB8500_KICK_WD));
+}
+
 static inline bool valid_bank(u8 bank)
 {
         return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
diff --git a/include/linux/mfd/abx500/ab8500-sysctrl.h b/include/linux/mfd/abx500/ab8500-sysctrl.h
index ebf12e793db9..990bc93f46e1 100644
--- a/include/linux/mfd/abx500/ab8500-sysctrl.h
+++ b/include/linux/mfd/abx500/ab8500-sysctrl.h
@@ -12,6 +12,7 @@
 
 int ab8500_sysctrl_read(u16 reg, u8 *value);
 int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value);
+void ab8500_restart(char mode, const char *cmd);
 
 #else
 
@@ -40,6 +41,7 @@ static inline int ab8500_sysctrl_clear(u16 reg, u8 bits)
 /* Configuration data for SysClkReq1RfClkBuf - SysClkReq8RfClkBuf */
 struct ab8500_sysctrl_platform_data {
         u8 initial_req_buf_config[8];
+        u16 (*reboot_reason_code)(const char *cmd);
 };
 
 /* Registers */
@@ -299,4 +301,8 @@ struct ab8500_sysctrl_platform_data {
 #define AB9540_SYSCLK12BUF4VALID_SYSCLK12BUF4VALID_MASK 0xFF
 #define AB9540_SYSCLK12BUF4VALID_SYSCLK12BUF4VALID_SHIFT 0
 
+#define AB8500_ENABLE_WD 0x1
+#define AB8500_KICK_WD 0x2
+#define AB8500_WD_RESTART_ON_EXPIRE 0x10
+
 #endif /* __AB8500_SYSCTRL_H */