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 --- board/a3m071/a3m071.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++- include/configs/a3m071.h | 5 +++++ 2 files changed, 60 insertions(+), 1 deletion(-)

diff --git a/board/a3m071/a3m071.c b/board/a3m071/a3m071.c index 0a86e9a..0f9f883 100644 --- a/board/a3m071/a3m071.c +++ b/board/a3m071/a3m071.c @@ -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 diff --git a/include/configs/a3m071.h b/include/configs/a3m071.h index d8559d8..13f3226 100644 --- a/include/configs/a3m071.h +++ b/include/configs/a3m071.h @@ -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