Date: Mon, 7 Aug 2006 19:05:00 GMT From: Warner Losh <imp@FreeBSD.org> To: Perforce Change Reviews <perforce@freebsd.org> Subject: PERFORCE change 103389 for review Message-ID: <200608071905.k77J50o7054589@repoman.freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=103389 Change 103389 by imp@imp_bugs on 2006/08/07 19:04:23 Implement watchdog. The OS has 30s to load and get to the point of disabling the watchdog before we reboot. 64s is the absolute max, and 30s seemed a good number. Usually it takes like 5s-10s. Affected files ... .. //depot/projects/arm/src/sys/boot/arm/at91/libat91/lib.h#13 edit .. //depot/projects/arm/src/sys/boot/arm/at91/libat91/reset.c#2 edit Differences ... ==== //depot/projects/arm/src/sys/boot/arm/at91/libat91/lib.h#13 (text) ==== @@ -40,7 +40,8 @@ /* XMODEM protocol */ int xmodem_rx(char *dst); -/* Reboot! Reset! */ +/* */ +void start_wdog(void); void reset(void); /* Delay us */ ==== //depot/projects/arm/src/sys/boot/arm/at91/libat91/reset.c#2 (text+ko) ==== @@ -28,10 +28,11 @@ #include "lib.h" /* - * int getc(int seconds) + * void reset() * - * Reads a character from the DBGU port, if one is available within about - * seconds seconds. It assumes that DBGU has already been initialized. + * Forces a reset of the system. Uses watchdog timer of '1', which + * corresponds to 128 / SLCK seconds (SLCK is 32,768 Hz, so 128/32768 is + * 1 / 256 ~= 5.4ms */ void reset(void) @@ -40,3 +41,17 @@ AT91C_BASE_ST->ST_WDMR = 1 | AT91C_ST_RSTEN; AT91C_BASE_ST->ST_CR = AT91C_ST_WDRST; } + +/* + * void start_wdog() + * + * Starts a watchdog timer. We force the boot process to get to the point + * it can kick the watch dog part of the ST part for the OS's driver. + */ +void +start_wdog(void) +{ + // The following should effect a reset after 30 seconds. + AT91C_BASE_ST->ST_WDMR = (30 * (32768 / 128)) | AT91C_ST_RSTEN; + AT91C_BASE_ST->ST_CR = AT91C_ST_WDRST; +}
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