OMAP2+: wd_timer: separate watchdog disable code from the rest of mach-omap2/devices.c

Split the wd_timer disable code out into its own file,
mach-omap2/wd_timer.c; it belongs in its own file rather than
cluttering up devices.c.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Charulatha Varadarajan <charu@ti.com>

4 files changed, 91 insertions, 51 deletions

diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index 1b699d3c6cb8..4a8ea79a2b0c 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -4,7 +4,7 @@
 
 # Common support
 obj-y := id.o io.o control.o mux.o devices.o serial.o gpmc.o timer-gp.o pm.o \
-         common.o gpio.o dma.o
+         common.o gpio.o dma.o wd_timer.o
 
 omap-2-3-common                         = irq.o sdrc.o prm2xxx_3xxx.o
 hwmod-common                            = omap_hwmod.o \
diff --git a/arch/arm/mach-omap2/devices.c b/arch/arm/mach-omap2/devices.c
index 1bca147ac91d..9221a486b51f 100644
--- a/arch/arm/mach-omap2/devices.c
+++ b/arch/arm/mach-omap2/devices.c
@@ -33,6 +33,7 @@
 
 #include "mux.h"
 #include "control.h"
+#include "wd_timer.h"
 
 #if defined(CONFIG_VIDEO_OMAP2) || defined(CONFIG_VIDEO_OMAP2_MODULE)
 
@@ -955,69 +956,23 @@ static inline void omap_init_vout(void) {}
 
 /*-------------------------------------------------------------------------*/
 
-/*
- * Inorder to avoid any assumptions from bootloader regarding WDT
- * settings, WDT module is reset during init. This enables the watchdog
- * timer. Hence it is required to disable the watchdog after the WDT reset
- * during init. Otherwise the system would reboot as per the default
- * watchdog timer registers settings.
- */
-#define OMAP_WDT_WPS    (0x34)
-#define OMAP_WDT_SPR    (0x48)
-
 static int omap2_disable_wdt(struct omap_hwmod *oh, void *unused)
 {
-        void __iomem *base;
-        int ret;
-
-        if (!oh) {
-                pr_err("%s: Could not look up wdtimer_hwmod\n", __func__);
-                return -EINVAL;
-        }
-
-        base = omap_hwmod_get_mpu_rt_va(oh);
-        if (!base) {
-                pr_err("%s: Could not get the base address for %s\n",
-                                oh->name, __func__);
-                return -EINVAL;
-        }
-
-        /* Enable the clocks before accessing the WDT registers */
-        ret = omap_hwmod_enable(oh);
-        if (ret) {
-                pr_err("%s: Could not enable clocks for %s\n",
-                                oh->name, __func__);
-                return ret;
-        }
-
-        /* sequence required to disable watchdog */
-        __raw_writel(0xAAAA, base + OMAP_WDT_SPR);
-        while (__raw_readl(base + OMAP_WDT_WPS) & 0x10)
-                cpu_relax();
-
-        __raw_writel(0x5555, base + OMAP_WDT_SPR);
-        while (__raw_readl(base + OMAP_WDT_WPS) & 0x10)
-                cpu_relax();
-
-        ret = omap_hwmod_idle(oh);
-        if (ret)
-                pr_err("%s: Could not disable clocks for %s\n",
-                                oh->name, __func__);
-
-        return ret;
+        return omap2_wd_timer_disable(oh);
 }
 
 static void __init omap_disable_wdt(void)
 {
         if (cpu_class_is_omap2())
                 omap_hwmod_for_each_by_class("wd_timer",
-                                                omap2_disable_wdt, NULL);
+                                             omap2_disable_wdt, NULL);
         return;
 }
 
 static int __init omap2_init_devices(void)
 {
-        /* please keep these calls, and their implementations above,
+        /*
+         * please keep these calls, and their implementations above,
          * in alphabetical order so they're easier to sort through.
          */
         omap_disable_wdt();
diff --git a/arch/arm/mach-omap2/wd_timer.c b/arch/arm/mach-omap2/wd_timer.c
new file mode 100644
index 000000000000..06c256d38988
--- /dev/null
+++ b/arch/arm/mach-omap2/wd_timer.c
@@ -0,0 +1,68 @@
+/*
+ * OMAP2+ MPU WD_TIMER-specific code
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/err.h>
+
+#include <plat/omap_hwmod.h>
+
+/*
+ * In order to avoid any assumptions from bootloader regarding WDT
+ * settings, WDT module is reset during init. This enables the watchdog
+ * timer. Hence it is required to disable the watchdog after the WDT reset
+ * during init. Otherwise the system would reboot as per the default
+ * watchdog timer registers settings.
+ */
+#define OMAP_WDT_WPS            0x34
+#define OMAP_WDT_SPR            0x48
+
+
+int omap2_wd_timer_disable(struct omap_hwmod *oh)
+{
+        void __iomem *base;
+        int ret;
+
+        if (!oh) {
+                pr_err("%s: Could not look up wdtimer_hwmod\n", __func__);
+                return -EINVAL;
+        }
+
+        base = omap_hwmod_get_mpu_rt_va(oh);
+        if (!base) {
+                pr_err("%s: Could not get the base address for %s\n",
+                                oh->name, __func__);
+                return -EINVAL;
+        }
+
+        /* Enable the clocks before accessing the WDT registers */
+        ret = omap_hwmod_enable(oh);
+        if (ret) {
+                pr_err("%s: Could not enable clocks for %s\n",
+                                oh->name, __func__);
+                return ret;
+        }
+
+        /* sequence required to disable watchdog */
+        __raw_writel(0xAAAA, base + OMAP_WDT_SPR);
+        while (__raw_readl(base + OMAP_WDT_WPS) & 0x10)
+                cpu_relax();
+
+        __raw_writel(0x5555, base + OMAP_WDT_SPR);
+        while (__raw_readl(base + OMAP_WDT_WPS) & 0x10)
+                cpu_relax();
+
+        ret = omap_hwmod_idle(oh);
+        if (ret)
+                pr_err("%s: Could not disable clocks for %s\n",
+                                oh->name, __func__);
+
+        return ret;
+}
+
diff --git a/arch/arm/mach-omap2/wd_timer.h b/arch/arm/mach-omap2/wd_timer.h
new file mode 100644
index 000000000000..e0054a2d5505
--- /dev/null
+++ b/arch/arm/mach-omap2/wd_timer.h
@@ -0,0 +1,17 @@
+/*
+ * OMAP2+ MPU WD_TIMER-specific function prototypes
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __ARCH_ARM_MACH_OMAP2_WD_TIMER_H
+#define __ARCH_ARM_MACH_OMAP2_WD_TIMER_H
+
+#include <plat/omap_hwmod.h>
+
+extern int omap2_wd_timer_disable(struct omap_hwmod *oh);
+
+#endif