blackfin: Move blackfin watchdog driver out of the blackfin arch folder.

- Enable hw_watchdog_init() in watchdog.h if CONFIG_HW_WATCHDOG is defined.
- Move blackfin hw watchdog driver to the generic driver folder.
- Call hw_watchdog_init() from blackfin board init code.
- Reuse macro CONFIG_WATCHDOG_TIMEOUT_MSECS
- Update README.watchdog accordingly

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>

4 files changed, 22 insertions, 33 deletions

diff --git a/arch/blackfin/cpu/Makefile b/arch/blackfin/cpu/Makefile
index 0a72ec5..145f63e 100644
--- a/arch/blackfin/cpu/Makefile
+++ b/arch/blackfin/cpu/Makefile
@@ -25,7 +25,6 @@ COBJS-y  += os_log.o
 COBJS-y  += reset.o
 COBJS-y  += serial.o
 COBJS-y  += traps.o
-COBJS-$(CONFIG_HW_WATCHDOG)  += watchdog.o
 
 SRCS     := $(SEXTRA:.o=.S) $(SOBJS:.o=.S) $(COBJS-y:.o=.c)
 OBJS     := $(addprefix $(obj),$(COBJS-y) $(SOBJS))
diff --git a/arch/blackfin/cpu/initcode.c b/arch/blackfin/cpu/initcode.c
index 8ef0b92..078209f 100644
--- a/arch/blackfin/cpu/initcode.c
+++ b/arch/blackfin/cpu/initcode.c
@@ -13,6 +13,7 @@
 
 #include <config.h>
 #include <asm/blackfin.h>
+#include <asm/mach-common/bits/watchdog.h>
 #include <asm/mach-common/bits/bootrom.h>
 #include <asm/mach-common/bits/core.h>
 
@@ -468,9 +469,11 @@ program_early_devices(ADI_BOOT_DATA *bs, uint *sdivB, uint *divB, uint *vcoB)
 		bfin_write_SEC_GCTL(0x1);
 		bfin_write_SEC_CCTL(0x1);
 #endif
+		bfin_write_WDOG_CTL(WDDIS);
+		SSYNC();
 		bfin_write_WDOG_CNT(MSEC_TO_SCLK(CONFIG_HW_WATCHDOG_TIMEOUT_INITCODE));
 #if CONFIG_BFIN_BOOT_MODE != BFIN_BOOT_UART
-		bfin_write_WDOG_CTL(0);
+		bfin_write_WDOG_CTL(WDEN);
 #endif
 		serial_putc('f');
 	}
diff --git a/arch/blackfin/cpu/start.S b/arch/blackfin/cpu/start.S
index 7155fc8..1c6ae35 100644
--- a/arch/blackfin/cpu/start.S
+++ b/arch/blackfin/cpu/start.S
@@ -32,6 +32,7 @@
 
 #include <config.h>
 #include <asm/blackfin.h>
+#include <asm/mach-common/bits/watchdog.h>
 #include <asm/mach-common/bits/core.h>
 #include <asm/mach-common/bits/pll.h>
 
@@ -65,20 +66,29 @@ ENTRY(_start)
 	p5.h = HI(COREMMR_BASE);
 
 #ifdef CONFIG_HW_WATCHDOG
-#ifndef __ADSPBF60x__
-# ifndef CONFIG_HW_WATCHDOG_TIMEOUT_START
-#  define CONFIG_HW_WATCHDOG_TIMEOUT_START 5000
-# endif
-	/* Program the watchdog with an initial timeout of ~5 seconds.
+	/* Program the watchdog with default timeout of ~5 seconds.
 	 * That should be long enough to bootstrap ourselves up and
 	 * then the common u-boot code can take over.
 	 */
+	r1 = WDDIS;
+# ifdef __ADSPBF60x__
+	[p4 + (WDOG_CTL - SYSMMR_BASE)] = r1;
+# else
+	W[p4 + (WDOG_CTL - SYSMMR_BASE)] = r1;
+# endif
+	SSYNC;
 	r0 = 0;
-	r0.h = HI(MSEC_TO_SCLK(CONFIG_HW_WATCHDOG_TIMEOUT_START));
+	r0.h = HI(MSEC_TO_SCLK(CONFIG_WATCHDOG_TIMEOUT_MSECS));
 	[p4 + (WDOG_CNT - SYSMMR_BASE)] = r0;
+	SSYNC;
+	r1 = WDEN;
 	/* fire up the watchdog - R0.L above needs to be 0x0000 */
-	W[p4 + (WDOG_CTL - SYSMMR_BASE)] = r0;
-#endif
+# ifdef __ADSPBF60x__
+	[p4 + (WDOG_CTL - SYSMMR_BASE)] = r1;
+# else
+	W[p4 + (WDOG_CTL - SYSMMR_BASE)] = r1;
+# endif
+	SSYNC;
 #endif
 
 	/* Turn on the serial for debugging the init process */
diff --git a/arch/blackfin/cpu/watchdog.c b/arch/blackfin/cpu/watchdog.c
deleted file mode 100644
index 1886bda..0000000
--- a/arch/blackfin/cpu/watchdog.c
+++ /dev/null
@@ -1,23 +0,0 @@
-/*
- * watchdog.c - driver for Blackfin on-chip watchdog
- *
- * Copyright (c) 2007-2009 Analog Devices Inc.
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <common.h>
-#include <watchdog.h>
-#include <asm/blackfin.h>
-
-void hw_watchdog_reset(void)
-{
-	bfin_write_WDOG_STAT(0);
-}
-
-void hw_watchdog_init(void)
-{
-	bfin_write_WDOG_CNT(5 * get_sclk());	/* 5 second timeout */
-	hw_watchdog_reset();
-	bfin_write_WDOG_CTL(0x0);
-}