mpc5200: a4m2k: Implement custom "dynamic" watchdog support
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>
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 @@
* 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 @@
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