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>

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))

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');
 	}

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 */

arch/blackfin/lib/board.c

@@ -279,9 +279,9 @@ void board_init_f(ulong bootflag)
 	dcache_enable();
 #endif
 
-#ifdef CONFIG_WATCHDOG
+#ifdef CONFIG_HW_WATCHDOG
 	serial_early_puts("Setting up external watchdog\n");
-	watchdog_init();
+	hw_watchdog_init();
 #endif
 
 #ifdef DEBUG

doc/README.watchdog

@@ -30,3 +30,6 @@ CONFIG_IMX_WATCHDOG
 
 CONFIG_XILINX_TB_WATCHDOG
 	Available for Xilinx Axi platforms to service timebase watchdog timer.
+
+CONFIG_BFIN_WATCHDOG
+	Available for bf5xx and bf6xx to service the watchdog.

drivers/watchdog/Makefile

@@ -33,6 +33,7 @@ endif
 COBJS-$(CONFIG_TNETV107X_WATCHDOG) += tnetv107x_wdt.o
 COBJS-$(CONFIG_S5P)               += s5p_wdt.o
 COBJS-$(CONFIG_XILINX_TB_WATCHDOG) += xilinx_tb_wdt.o
+COBJS-$(CONFIG_BFIN_WATCHDOG)  += bfin_wdt.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)

arch/blackfin/cpu/watchdog.c → drivers/watchdog/bfin_wdt.c

@@ -9,6 +9,7 @@
 #include <common.h>
 #include <watchdog.h>
 #include <asm/blackfin.h>
+#include <asm/mach-common/bits/watchdog.h>
 
 void hw_watchdog_reset(void)
 {
@@ -17,7 +18,9 @@ void hw_watchdog_reset(void)
 
 void hw_watchdog_init(void)
 {
-	bfin_write_WDOG_CNT(5 * get_sclk());	/* 5 second timeout */
+	bfin_write_WDOG_CTL(WDDIS);
+	SSYNC();
+	bfin_write_WDOG_CNT(CONFIG_WATCHDOG_TIMEOUT_MSECS / 1000 * get_sclk());
 	hw_watchdog_reset();
-	bfin_write_WDOG_CTL(0x0);
+	bfin_write_WDOG_CTL(WDEN);
 }

include/configs/bfin_adi_common.h

@@ -314,5 +314,11 @@
 #define CONFIG_BFIN_SPI_GPIO_CS /* Only matters if BFIN_SPI is enabled */
 #define CONFIG_LZMA
 #define CONFIG_MONITOR_IS_IN_RAM
+#ifdef CONFIG_HW_WATCHDOG
+# define CONFIG_BFIN_WATCHDOG
+# ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS
+#  define CONFIG_WATCHDOG_TIMEOUT_MSECS 5000
+# endif
+#endif
 
 #endif

include/watchdog.h

@@ -108,8 +108,7 @@ int init_func_watchdog_reset(void);
 	void reset_4xx_watchdog(void);
 #endif
 
-/* Freescale i.MX */
-#if defined(CONFIG_IMX_WATCHDOG) && !defined(__ASSEMBLY__)
+#if defined(CONFIG_HW_WATCHDOG) && !defined(__ASSEMBLY__)
 	void hw_watchdog_init(void);
 #endif
 #endif /* _WATCHDOG_H_ */