Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc

* 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc:
  [POWERPC] Enable restart support for lite5200 board
  [POWERPC] Add restart support for mpc52xx based platforms
  [POWERPC] Update device tree binding for mpc5200 gpt
  [POWERPC] Add mpc52xx_find_and_map_path(), refactor utility functions
  [POWERPC] bestcomm: Restrict bus prefetch bugfix to original mpc5200 silicon.

2 files changed, 71 insertions, 4 deletions

diff --git a/arch/powerpc/platforms/52xx/lite5200.c b/arch/powerpc/platforms/52xx/lite5200.c
index 65b7ae426238..25d2bfa3d9dc 100644
--- a/arch/powerpc/platforms/52xx/lite5200.c
+++ b/arch/powerpc/platforms/52xx/lite5200.c
@@ -145,6 +145,9 @@ static void __init lite5200_setup_arch(void)
 	/* Some mpc5200 & mpc5200b related configuration */
 	mpc5200_setup_xlb_arbiter();
 
+	/* Map wdt for mpc52xx_restart() */
+	mpc52xx_map_wdt();
+
 #ifdef CONFIG_PM
 	mpc52xx_suspend.board_suspend_prepare = lite5200_suspend_prepare;
 	mpc52xx_suspend.board_resume_finish = lite5200_resume_finish;
@@ -183,5 +186,6 @@ define_machine(lite5200) {
 	.init		= mpc52xx_declare_of_platform_devices,
 	.init_IRQ 	= mpc52xx_init_irq,
 	.get_irq 	= mpc52xx_get_irq,
+	.restart	= mpc52xx_restart,
 	.calibrate_decr	= generic_calibrate_decr,
 };
diff --git a/arch/powerpc/platforms/52xx/mpc52xx_common.c b/arch/powerpc/platforms/52xx/mpc52xx_common.c
index 3bc201e07e6b..9850685c5429 100644
--- a/arch/powerpc/platforms/52xx/mpc52xx_common.c
+++ b/arch/powerpc/platforms/52xx/mpc52xx_common.c
@@ -18,15 +18,20 @@
 #include <asm/prom.h>
 #include <asm/mpc52xx.h>
 
+/*
+ * This variable is mapped in mpc52xx_map_wdt() and used in mpc52xx_restart().
+ * Permanent mapping is required because mpc52xx_restart() can be called
+ * from interrupt context while node mapping (which calls ioremap())
+ * cannot be used at such point.
+ */
+static volatile struct mpc52xx_gpt *mpc52xx_wdt = NULL;
 
-void __iomem *
-mpc52xx_find_and_map(const char *compatible)
+static void __iomem *
+mpc52xx_map_node(struct device_node *ofn)
 {
-	struct device_node *ofn;
 	const u32 *regaddr_p;
 	u64 regaddr64, size64;
 
-	ofn = of_find_compatible_node(NULL, NULL, compatible);
 	if (!ofn)
 		return NULL;
 
@@ -42,8 +47,23 @@ mpc52xx_find_and_map(const char *compatible)
 
 	return ioremap((u32)regaddr64, (u32)size64);
 }
+
+void __iomem *
+mpc52xx_find_and_map(const char *compatible)
+{
+	return mpc52xx_map_node(
+		of_find_compatible_node(NULL, NULL, compatible));
+}
+
 EXPORT_SYMBOL(mpc52xx_find_and_map);
 
+void __iomem *
+mpc52xx_find_and_map_path(const char *path)
+{
+	return mpc52xx_map_node(of_find_node_by_path(path));
+}
+
+EXPORT_SYMBOL(mpc52xx_find_and_map_path);
 
 /**
  * 	mpc52xx_find_ipb_freq - Find the IPB bus frequency for a device
@@ -113,3 +133,46 @@ mpc52xx_declare_of_platform_devices(void)
 			"Error while probing of_platform bus\n");
 }
 
+void __init
+mpc52xx_map_wdt(void)
+{
+	const void *has_wdt;
+	struct device_node *np;
+
+	/* mpc52xx_wdt is mapped here and used in mpc52xx_restart,
+	 * possibly from a interrupt context. wdt is only implement
+	 * on a gpt0, so check has-wdt property before mapping.
+	 */
+	for_each_compatible_node(np, NULL, "fsl,mpc5200-gpt") {
+		has_wdt = of_get_property(np, "fsl,has-wdt", NULL);
+		if (has_wdt) {
+			mpc52xx_wdt = mpc52xx_map_node(np);
+			return;
+		}
+	}
+	for_each_compatible_node(np, NULL, "mpc5200-gpt") {
+		has_wdt = of_get_property(np, "has-wdt", NULL);
+		if (has_wdt) {
+			mpc52xx_wdt = mpc52xx_map_node(np);
+			return;
+		}
+	}
+}
+
+void
+mpc52xx_restart(char *cmd)
+{
+	local_irq_disable();
+
+	/* Turn on the watchdog and wait for it to expire.
+	 * It effectively does a reset. */
+	if (mpc52xx_wdt) {
+		out_be32(&mpc52xx_wdt->mode, 0x00000000);
+		out_be32(&mpc52xx_wdt->count, 0x000000ff);
+		out_be32(&mpc52xx_wdt->mode, 0x00009004);
+	} else
+		printk("mpc52xx_restart: Can't access wdt. "
+			"Restart impossible, system halted.\n");
+
+	while (1);
+}