[U-Boot] [PATCH 10/35] arm: socfpga: Add watchdog disable for socfpga

[Dinh Nguyen]

On 09/15/2014 06:06 AM, Marek Vasut wrote:
> From: Pavel Machek <pavel at denx.de>
> 
> This adds watchdog disable. It is neccessary for running Linux kernel.
> 
> Signed-off-by: Pavel Machek <pavel at denx.de>
> Signed-off-by: Marek Vasut <marex at denx.de>
> Cc: Chin Liang See <clsee at altera.com>
> Cc: Dinh Nguyen <dinguyen at altera.com>
> Cc: Albert Aribaud <albert.u.boot at aribaud.net>
> Cc: Tom Rini <trini at ti.com>
> Cc: Wolfgang Denk <wd at denx.de>
> Cc: Pavel Machek <pavel at denx.de>
> ---
>  arch/arm/cpu/armv7/socfpga/misc.c                 |  4 ++++
>  arch/arm/cpu/armv7/socfpga/reset_manager.c        | 13 +++++++++++++
>  arch/arm/include/asm/arch-socfpga/reset_manager.h |  2 ++
>  3 files changed, 19 insertions(+)
> 
> diff --git a/arch/arm/cpu/armv7/socfpga/misc.c b/arch/arm/cpu/armv7/socfpga/misc.c
> index ecae393..15cd8c2 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;
>  
> @@ -38,6 +39,9 @@ int overwrite_console(void)
>  
>  int misc_init_r(void)
>  {
> +	/* This is needed, otherwise kernel is rebooted by watchdog. */
> +	watchdog_disable();
> +
>  	return 0;
>  }
>  
> diff --git a/arch/arm/cpu/armv7/socfpga/reset_manager.c b/arch/arm/cpu/armv7/socfpga/reset_manager.c
> index e320c01..07b8c4f 100644
> --- a/arch/arm/cpu/armv7/socfpga/reset_manager.c
> +++ b/arch/arm/cpu/armv7/socfpga/reset_manager.c
> @@ -14,6 +14,19 @@ DECLARE_GLOBAL_DATA_PTR;
>  static const struct socfpga_reset_manager *reset_manager_base =
>  		(void *)SOCFPGA_RSTMGR_ADDRESS;
>  
> +#define RSTMGR_PERMODRST_L4WD0_LSB 6

Should this define go into -> arch-socfpga/reset_manager.h ?

Dinh


> +
> +/* Disable the watchdog (toggle reset to watchdog) */
> +void watchdog_disable(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 3e95476..e004343 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 watchdog_disable(void);
> +
>  struct socfpga_reset_manager {
>  	u32	status;
>  	u32	ctrl;
>