powerpc: mpc8xx: move watchdog into drivers/watchdog

In preparation of DM watchdog, move basic actions into drivers/watchdog

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>

arch/powerpc/Kconfig

@@ -34,7 +34,7 @@ config MPC8xx
 	bool "MPC8xx"
 	select BOARD_EARLY_INIT_F
 	imply CMD_REGINFO
-	imply HW_WATCHDOG
+	imply MPC8xx_WATCHDOG
 
 endchoice
 

arch/powerpc/cpu/mpc8xx/Kconfig

@@ -25,6 +25,10 @@ config MPC885
 
 endchoice
 
+config MPC8xx_WATCHDOG
+	bool "Watchdog"
+	select HW_WATCHDOG
+
 config 8xx_GCLK_FREQ
 	int "CPU GCLK Frequency"
 

arch/powerpc/cpu/mpc8xx/cpu.c

@@ -270,18 +270,6 @@ unsigned long get_tbclk(void)
 	return oscclk / 16;
 }
 
-/* ------------------------------------------------------------------------- */
-
-#if defined(CONFIG_HW_WATCHDOG)
-void hw_watchdog_reset(void)
-{
-	immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;
-
-	out_be16(&immr->im_siu_conf.sc_swsr, 0x556c);	/* write magic1 */
-	out_be16(&immr->im_siu_conf.sc_swsr, 0xaa39);	/* write magic2 */
-}
-#endif /* CONFIG_WATCHDOG */
-
 /*
  * Initializes on-chip ethernet controllers.
  * to override, implement board_eth_init()

drivers/watchdog/Makefile

@@ -23,3 +23,4 @@ obj-$(CONFIG_WDT_BCM6345) += bcm6345_wdt.o
 obj-$(CONFIG_BCM2835_WDT)       += bcm2835_wdt.o
 obj-$(CONFIG_WDT_ORION) += orion_wdt.o
 obj-$(CONFIG_WDT_CDNS) += cdns_wdt.o
+obj-$(CONFIG_MPC8xx_WATCHDOG) += mpc8xx_wdt.o

drivers/watchdog/mpc8xx_wdt.c

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2017 CS Systemes d'Information
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <mpc8xx.h>
+#include <asm/cpm_8xx.h>
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+void hw_watchdog_reset(void)
+{
+	immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
+
+	out_be16(&immap->im_siu_conf.sc_swsr, 0x556c);	/* write magic1 */
+	out_be16(&immap->im_siu_conf.sc_swsr, 0xaa39);	/* write magic2 */
+}
+