Commit e0dc09ff authored by Timur Tabi's avatar Timur Tabi Committed by Kumar Gala
Browse files

powerpc/watchdog: Make default timeout for Book-E watchdog a Kconfig option 



The PowerPC Book-E watchdog driver (booke_wdt.c) defines a default timeout
value in the code based on whether it's a Freescale Book-E part of not.
Instead of having hard-coded values in the driver, make it a Kconfig
option.

As newer chips gets faster, the current default values become less
appropriate, since the timeout sometimes occurs before the kernel finishes
booting.  Making the value a Kconfig option allows BSPs to configure a new
value without requiring the wdt_period command-line parameter to be set.

Signed-off-by: default avatarTimur Tabi <timur@freescale.com>
Signed-off-by: default avatarKumar Gala <galak@kernel.crashing.org>
parent abd12fe4

drivers/watchdog/Kconfig

+17 −0
Original line number Diff line number Diff line
@@ -966,6 +966,23 @@ config BOOKE_WDT 
	  Please see Documentation/watchdog/watchdog-api.txt for

	  more information.



config BOOKE_WDT_DEFAULT_TIMEOUT

	int "PowerPC Book-E Watchdog Timer Default Timeout"

	depends on BOOKE_WDT

	default 38 if FSL_BOOKE

	range 0 63 if FSL_BOOKE

	default 3 if !FSL_BOOKE

	range 0 3 if !FSL_BOOKE

	help

	  Select the default watchdog timer period to be used by the PowerPC

	  Book-E watchdog driver.  A watchdog "event" occurs when the bit

	  position represented by this number transitions from zero to one.



	  For Freescale Book-E processors, this is a number between 0 and 63.

	  For other Book-E processors, this is a number between 0 and 3.



	  The value can be overidden by the wdt_period command-line parameter.



# PPC64 Architecture



config WATCHDOG_RTAS

drivers/watchdog/booke_wdt.c

+1 −7
Original line number Diff line number Diff line
@@ -33,14 +33,8 @@ 
 * occur, and the final time the board will reset.

 */



#ifdef	CONFIG_FSL_BOOKE

#define WDT_PERIOD_DEFAULT 38	/* Ex. wdt_period=28 bus=333Mhz,reset=~40sec */

#else

#define WDT_PERIOD_DEFAULT 3	/* Refer to the PPC40x and PPC4xx manuals */

#endif				/* for timing information */



u32 booke_wdt_enabled;

u32 booke_wdt_period = WDT_PERIOD_DEFAULT;

u32 booke_wdt_period = CONFIG_BOOKE_WDT_DEFAULT_TIMEOUT;



#ifdef	CONFIG_FSL_BOOKE

#define WDTP(x)		((((x)&0x3)<<30)|(((x)&0x3c)<<15))

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