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mpc5200: a4m2k: Implement custom "dynamic" watchdog support

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This patch adds a custom U-Boot command "wdogtoggle" which enables the
external hardware watchdog toggling via an GPIO pin on the a4m2k
board. After issuing this commands, the watchdog will be serviced
by U-Boot so that the user can use all U-Boot commands from the
prompt.

Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Stefan Roese 2013-02-07 02:10:28 +00:00 committed by Wolfgang Denk
parent d4451d3503
commit aed7548448
2 changed files with 60 additions and 1 deletions
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56
board/a3m071/a3m071.c
View file

@ -255,7 +255,7 @@ void spl_board_init(void)
* MPC5XXX_WU_GPIO_DIR direction is already 0 (INPUT)
* set bit 0(msb) to 1
*/
setbits_be32((void *)MPC5XXX_WU_GPIO_ENABLE, 1 << (31 - 0));
setbits_be32((void *)MPC5XXX_WU_GPIO_ENABLE, CONFIG_WDOG_GPIO_PIN);
#if defined(CONFIG_A4M2K)
/* Setup USB[x] as MPCDiag[0..3] GPIO outputs */
@ -410,3 +410,57 @@ int spl_start_uboot(void)
return 1;
}
#endif
#if defined(CONFIG_HW_WATCHDOG)
static int watchdog_toggle;
void hw_watchdog_reset(void)
{
int val;
/*
* Check if watchdog is enabled via user command
*/
if ((gd->flags & GD_FLG_RELOC) && watchdog_toggle) {
/* Set direction to output */
setbits_be32((void *)MPC5XXX_WU_GPIO_DIR, CONFIG_WDOG_GPIO_PIN);
/*
* Toggle watchdog output
*/
val = (in_be32((void *)MPC5XXX_WU_GPIO_DATA_O) &
CONFIG_WDOG_GPIO_PIN);
if (val) {
clrbits_be32((void *)MPC5XXX_WU_GPIO_DATA_O,
CONFIG_WDOG_GPIO_PIN);
} else {
setbits_be32((void *)MPC5XXX_WU_GPIO_DATA_O,
CONFIG_WDOG_GPIO_PIN);
}
}
}
int do_wdog_toggle(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
if (argc != 2)
goto usage;
if (strncmp(argv[1], "on", 2) == 0)
watchdog_toggle = 1;
else if (strncmp(argv[1], "off", 3) == 0)
watchdog_toggle = 0;
else
goto usage;
return 0;
usage:
printf("Usage: wdogtoggle %s\n", cmdtp->usage);
return 1;
}
U_BOOT_CMD(
wdogtoggle, CONFIG_SYS_MAXARGS, 2, do_wdog_toggle,
"toggle GPIO pin to service watchdog",
"[on/off] - Switch watchdog toggling via GPIO pin on/off"
);
#endif

5
include/configs/a3m071.h
View file

@ -166,6 +166,11 @@
#define CONFIG_SYS_GPS_PORT_CONFIG_2 0x1005C005
#endif
#define CONFIG_WDOG_GPIO_PIN GPIO_WKUP_7
#if defined(CONFIG_A4M2K) && !defined(CONFIG_SPL_BUILD)
#define CONFIG_HW_WATCHDOG /* Use external HW-Watchdog */
#endif
/*
* Configuration matrix
* MSB LSB