diff options
author | Lee Jones <lee.jones@linaro.org> | 2013-02-12 10:11:19 -0500 |
---|---|---|
committer | Lee Jones <lee.jones@linaro.org> | 2013-03-06 23:28:16 -0500 |
commit | 75932094601b404fc9ef28f7b6c0aa83dd619af0 (patch) | |
tree | 721cb5fc4835fa602eae0b011d1d08627cfb147f /drivers/mfd/ab8500-sysctrl.c | |
parent | 9581ae39de8833a7affaef24caadef2830603fef (diff) |
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>
Diffstat (limited to 'drivers/mfd/ab8500-sysctrl.c')
-rw-r--r-- | drivers/mfd/ab8500-sysctrl.c | 63 |
1 files changed, 63 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 @@ | |||
15 | #include <linux/mfd/abx500/ab8500.h> | 15 | #include <linux/mfd/abx500/ab8500.h> |
16 | #include <linux/mfd/abx500/ab8500-sysctrl.h> | 16 | #include <linux/mfd/abx500/ab8500-sysctrl.h> |
17 | 17 | ||
18 | /* RtcCtrl bits */ | ||
19 | #define AB8500_ALARM_MIN_LOW 0x08 | ||
20 | #define AB8500_ALARM_MIN_MID 0x09 | ||
21 | #define RTC_CTRL 0x0B | ||
22 | #define RTC_ALARM_ENABLE 0x4 | ||
23 | |||
18 | static struct device *sysctrl_dev; | 24 | static struct device *sysctrl_dev; |
19 | 25 | ||
20 | void ab8500_power_off(void) | 26 | void ab8500_power_off(void) |
@@ -79,6 +85,63 @@ shutdown: | |||
79 | } | 85 | } |
80 | } | 86 | } |
81 | 87 | ||
88 | /* | ||
89 | * Use the AB WD to reset the platform. It will perform a hard | ||
90 | * reset instead of a soft reset. Write the reset reason to | ||
91 | * the AB before reset, which can be read upon restart. | ||
92 | */ | ||
93 | void ab8500_restart(char mode, const char *cmd) | ||
94 | { | ||
95 | struct ab8500_platform_data *plat; | ||
96 | struct ab8500_sysctrl_platform_data *pdata; | ||
97 | u16 reason = 0; | ||
98 | u8 val; | ||
99 | |||
100 | if (sysctrl_dev == NULL) { | ||
101 | pr_err("%s: sysctrl not initialized\n", __func__); | ||
102 | return; | ||
103 | } | ||
104 | |||
105 | plat = dev_get_platdata(sysctrl_dev->parent); | ||
106 | pdata = plat->sysctrl; | ||
107 | if (pdata->reboot_reason_code) | ||
108 | reason = pdata->reboot_reason_code(cmd); | ||
109 | else | ||
110 | pr_warn("[%s] No reboot reason set. Default reason %d\n", | ||
111 | __func__, reason); | ||
112 | |||
113 | /* | ||
114 | * Disable RTC alarm, just a precaution so that no alarm | ||
115 | * is running when WD reset is executed. | ||
116 | */ | ||
117 | abx500_get_register_interruptible(sysctrl_dev, AB8500_RTC, | ||
118 | RTC_CTRL , &val); | ||
119 | abx500_set_register_interruptible(sysctrl_dev, AB8500_RTC, | ||
120 | RTC_CTRL , (val & ~RTC_ALARM_ENABLE)); | ||
121 | |||
122 | /* | ||
123 | * Android is not using the RTC alarm registers during reboot | ||
124 | * so we borrow them for writing the reason of reset | ||
125 | */ | ||
126 | |||
127 | /* reason[8 LSB] */ | ||
128 | val = reason & 0xFF; | ||
129 | abx500_set_register_interruptible(sysctrl_dev, AB8500_RTC, | ||
130 | AB8500_ALARM_MIN_LOW , val); | ||
131 | |||
132 | /* reason[8 MSB] */ | ||
133 | val = (reason>>8) & 0xFF; | ||
134 | abx500_set_register_interruptible(sysctrl_dev, AB8500_RTC, | ||
135 | AB8500_ALARM_MIN_MID , val); | ||
136 | |||
137 | /* Setting WD timeout to 0 */ | ||
138 | ab8500_sysctrl_write(AB8500_MAINWDOGTIMER, 0xFF, 0x0); | ||
139 | |||
140 | /* Setting the parameters to AB8500 WD*/ | ||
141 | ab8500_sysctrl_write(AB8500_MAINWDOGCTRL, 0xFF, (AB8500_ENABLE_WD | | ||
142 | AB8500_WD_RESTART_ON_EXPIRE | AB8500_KICK_WD)); | ||
143 | } | ||
144 | |||
82 | static inline bool valid_bank(u8 bank) | 145 | static inline bool valid_bank(u8 bank) |
83 | { | 146 | { |
84 | return ((bank == AB8500_SYS_CTRL1_BLOCK) || | 147 | return ((bank == AB8500_SYS_CTRL1_BLOCK) || |