mpc85xx: watchdog initialisation added

Function to inititialize the cpu watchdog added.
Signed-off-by: NRainer Boschung <rainer.boschung@keymile.com>
[York Sun: Add prototype in watchdog.h]
Reviewed-by: NYork Sun <yorksun@freescale.com>

arch/powerpc/cpu/mpc85xx/cpu.c

@@ -310,6 +310,14 @@ __weak unsigned long get_tbclk (void)
 
 
 #if defined(CONFIG_WATCHDOG)
+#define WATCHDOG_MASK (TCR_WP(63) | TCR_WRC(3) | TCR_WIE)
+void
+init_85xx_watchdog(void)
+{
+	mtspr(SPRN_TCR, (mfspr(SPRN_TCR) & ~WATCHDOG_MASK) |
+	      TCR_WP(CONFIG_WATCHDOG_PRESC) | TCR_WRC(CONFIG_WATCHDOG_RC));
+}
+
 void
 reset_85xx_watchdog(void)
 {

include/watchdog.h

@@ -95,4 +95,8 @@ int init_func_watchdog_reset(void);
 #if defined(CONFIG_HW_WATCHDOG) && !defined(__ASSEMBLY__)
 	void hw_watchdog_init(void);
 #endif
+
+#if defined(CONFIG_MPC85xx) && !defined(__ASSEMBLY__)
+	void init_85xx_watchdog(void);
+#endif
 #endif /* _WATCHDOG_H_ */