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board: freescale: p1_p2_rdb_pc: Turn off watchdog before reset

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P1/P2 RDB boards have external max6370 watchdog connected to CPLD and this
watchdog is not deactivated on board reset. So if it is active during board
reset, it can trigger another reset when CPU is booting U-Boot. To prevent
possible infinite reset loop caused by external watchdog, turn it off
before reset.

Do it via a new board_reset_prepare() callback which is called from
do_reset() function before any reset sequence.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
This commit is contained in:
Pali Rohár
2022-08-01 15:31:46 +02:00
committed by Peng Fan
parent 7e962cb132
commit 44366be10a
2 changed files with 16 additions and 0 deletions
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4
arch/powerpc/cpu/mpc85xx/cpu.c
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@@ -44,6 +44,7 @@ __board_reset(void)
{
/* Do nothing */
}
void board_reset_prepare(void) __attribute__((weak, alias("__board_reset")));
void board_reset(void) __attribute__((weak, alias("__board_reset")));
void board_reset_last(void) __attribute__((weak, alias("__board_reset")));
@@ -320,6 +321,9 @@ int do_reset(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
#else
volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
/* Call board-specific preparation for reset */
board_reset_prepare();
/* Attempt board-specific reset */
board_reset();