diff options
| author | Pavel Machek <pavel@denx.de> | 2014-09-09 14:03:28 +0200 |
|---|---|---|
| committer | Marek Vasut <marex@denx.de> | 2014-10-06 17:46:48 +0200 |
| commit | de6da9255ac4017e6bf6c98f533829a6eb67f3f6 (patch) | |
| tree | b704a6d12e3bfaf45dbdcaea346ef3061320e44b /arch/arm | |
| parent | be324354eebcd809bf539d2414c7c0a370847f26 (diff) | |
arm: socfpga: Add watchdog disable for socfpga
This adds watchdog disable. It is neccessary for running Linux kernel.
Signed-off-by: Pavel Machek <pavel@denx.de>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@altera.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Tom Rini <trini@ti.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Pavel Machek <pavel@denx.de>
V2: Move RSTMGR_PERMODRST_L4WD0_LSB to reset_manager.h
Reset watchdog only if CONFIG_HW_WATCHDOG is undefined (the default)
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/cpu/armv7/socfpga/misc.c | 14 | ||||
| -rw-r--r-- | arch/arm/cpu/armv7/socfpga/reset_manager.c | 12 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-socfpga/reset_manager.h | 4 |
3 files changed, 30 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/socfpga/misc.c b/arch/arm/cpu/armv7/socfpga/misc.c index ecae393410..b633615208 100644 --- a/arch/arm/cpu/armv7/socfpga/misc.c +++ b/arch/arm/cpu/armv7/socfpga/misc.c @@ -8,6 +8,7 @@ #include <asm/io.h> #include <miiphy.h> #include <netdev.h> +#include <asm/arch/reset_manager.h> DECLARE_GLOBAL_DATA_PTR; @@ -36,6 +37,19 @@ int overwrite_console(void) } #endif +int arch_cpu_init(void) +{ + /* + * If the HW watchdog is NOT enabled, make sure it is not running, + * for example because it was enabled in the preloader. This might + * trigger a watchdog-triggered reboot of Linux kernel later. + */ +#ifndef CONFIG_HW_WATCHDOG + socfpga_watchdog_reset(); +#endif + return 0; +} + int misc_init_r(void) { return 0; diff --git a/arch/arm/cpu/armv7/socfpga/reset_manager.c b/arch/arm/cpu/armv7/socfpga/reset_manager.c index e320c011ae..5d7aba467f 100644 --- a/arch/arm/cpu/armv7/socfpga/reset_manager.c +++ b/arch/arm/cpu/armv7/socfpga/reset_manager.c @@ -14,6 +14,18 @@ DECLARE_GLOBAL_DATA_PTR; static const struct socfpga_reset_manager *reset_manager_base = (void *)SOCFPGA_RSTMGR_ADDRESS; +/* Toggle reset signal to watchdog (WDT is disabled after this operation!) */ +void socfpga_watchdog_reset(void) +{ + /* assert reset for watchdog */ + setbits_le32(&reset_manager_base->per_mod_reset, + 1 << RSTMGR_PERMODRST_L4WD0_LSB); + + /* deassert watchdog from reset (watchdog in not running state) */ + clrbits_le32(&reset_manager_base->per_mod_reset, + 1 << RSTMGR_PERMODRST_L4WD0_LSB); +} + /* * Write the reset manager register to cause reset */ diff --git a/arch/arm/include/asm/arch-socfpga/reset_manager.h b/arch/arm/include/asm/arch-socfpga/reset_manager.h index 3e95476828..18506e69fd 100644 --- a/arch/arm/include/asm/arch-socfpga/reset_manager.h +++ b/arch/arm/include/asm/arch-socfpga/reset_manager.h @@ -10,6 +10,8 @@ void reset_cpu(ulong addr); void reset_deassert_peripherals_handoff(void); +void socfpga_watchdog_reset(void); + struct socfpga_reset_manager { u32 status; u32 ctrl; @@ -27,4 +29,6 @@ struct socfpga_reset_manager { #define RSTMGR_CTRL_SWWARMRSTREQ_LSB 1 #endif +#define RSTMGR_PERMODRST_L4WD0_LSB 6 + #endif /* _RESET_MANAGER_H_ */ |