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mfd: ab8500-sysctrl: Add new reset function

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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>
This commit is contained in:
Lee Jones 2013-02-12 15:11:19 +00:00
parent 9581ae39de
commit 7593209460
2 changed files with 69 additions and 0 deletions
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63
drivers/mfd/ab8500-sysctrl.c
View file

@ -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) ||

6
include/linux/mfd/abx500/ab8500-sysctrl.h
View file

@ -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 */