[U-Boot-Users] [PATCH] Feed the watchdog in u-boot for 8610 board.

[Jason Jin]

The watchdog on 8610 board is enabled by setting sw[6]
to on. Once enabled, the watchdog can not be disabled
by software. So feed the dog in u-boot is necessary for
normal operation.

Signed-off-by: Jason Jin <Jason.jin at freescale.com>
---
 cpu/mpc86xx/cpu.c             |   14 ++++++++++++++
 cpu/mpc86xx/interrupts.c      |    1 +
 include/asm-ppc/immap_86xx.h  |   14 +++++++++++++-
 include/configs/MPC8610HPCD.h |    3 ++-
 4 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/cpu/mpc86xx/cpu.c b/cpu/mpc86xx/cpu.c
index bf4e651..6dd0655 100644
--- a/cpu/mpc86xx/cpu.c
+++ b/cpu/mpc86xx/cpu.c
@@ -213,6 +213,20 @@ get_tbclk(void)
 void
 watchdog_reset(void)
 {
+
+#if defined(CONFIG_MPC8610)
+/*This actually feed the hard enabled watchdog*/
+	volatile immap_t *immap = (immap_t *)CFG_IMMR;
+	volatile ccsr_wdt_t *wdt = &immap->im_wdt;
+	volatile ccsr_gur_t *gur = &immap->im_gur;
+	u32 tmp = gur->pordevsr;
+
+	if(tmp & 0x4000) {
+		wdt->swsrr = 0x556c;
+		wdt->swsrr = 0xaa39;
+	}
+#endif
+
 }
 #endif	/* CONFIG_WATCHDOG */
 
diff --git a/cpu/mpc86xx/interrupts.c b/cpu/mpc86xx/interrupts.c
index d9f634f..f16744b 100644
--- a/cpu/mpc86xx/interrupts.c
+++ b/cpu/mpc86xx/interrupts.c
@@ -36,6 +36,7 @@
 #include <command.h>
 #include <asm/processor.h>
 #include <ppc_asm.tmpl>
+#include <watchdog.h>
 
 unsigned long decrementer_count;    /* count value for 1e6/HZ microseconds */
 unsigned long timestamp;
diff --git a/include/asm-ppc/immap_86xx.h b/include/asm-ppc/immap_86xx.h
index 7526061..93a4eb7 100644
--- a/include/asm-ppc/immap_86xx.h
+++ b/include/asm-ppc/immap_86xx.h
@@ -1304,9 +1304,19 @@ typedef struct ccsr_gur {
 	uint    lynxdcr1;        /* 0xe0f08 - Lynx debug control register 1*/
 	int     res14[6];
 	uint    ddrioovcr;      /* 0xe0f24 - DDR IO Overdrive Control register */
-	char	res15[61656];
+	char	res15[216];
 } ccsr_gur_t;
 
+/*Watchdog register block(0xe_4000-0xe_4fff)*/
+typedef struct ccsr_wdt {
+	uint	res0;
+	uint	swcrr; /* System watchdog control register */
+	uint	swcnr; /* System watchdog count register */
+	char	res1[2];
+	ushort	swsrr; /* System watchdog service register */
+	char	res2[4080];
+}ccsr_wdt_t;
+
 typedef struct immap {
 	ccsr_local_mcm_t	im_local_mcm;
 	ccsr_ddr_t		im_ddr1;
@@ -1330,6 +1340,8 @@ typedef struct immap {
 	char                    res5[389120];
 	ccsr_rio_t		im_rio;
 	ccsr_gur_t		im_gur;
+	char			res6[12288];
+	ccsr_wdt_t		im_wdt;
 } immap_t;
 
 extern immap_t  *immr;
diff --git a/include/configs/MPC8610HPCD.h b/include/configs/MPC8610HPCD.h
index 53d6955..4d61a61 100644
--- a/include/configs/MPC8610HPCD.h
+++ b/include/configs/MPC8610HPCD.h
@@ -486,7 +486,8 @@
 #endif
 
 
-#undef CONFIG_WATCHDOG			/* watchdog disabled */
+#define CONFIG_WATCHDOG		/* watchdog enabled */
+#define CFG_WATCHDOG_FREQ	5000	/*Feed interval, 5s*/
 
 /*DIU Configuration*/
 #define DIU_CONNECT_TO_DVI		/* DIU controller connects to DVI encoder*/
-- 
1.5.2