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authorStefan Roese <sr@denx.de>2013-02-07 02:10:28 +0000
committerWolfgang Denk <wd@denx.de>2013-03-09 08:19:21 +0100
commitaed7548448951f1b25102306f7a149cc33b3a10c (patch)
treecfdec4bd4593cde20225839b8c5db1e913fa9296 /board/a3m071
parentd4451d3503e630fa0d70a58dcfc759e07a9017d1 (diff)
downloadblackbird-obmc-uboot-aed7548448951f1b25102306f7a149cc33b3a10c.tar.gz
blackbird-obmc-uboot-aed7548448951f1b25102306f7a149cc33b3a10c.zip
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>
Diffstat (limited to 'board/a3m071')
-rw-r--r--board/a3m071/a3m071.c56
1 files changed, 55 insertions, 1 deletions
diff --git a/board/a3m071/a3m071.c b/board/a3m071/a3m071.c
index 0a86e9abc1..0f9f883e90 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
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