From 68fb0d203f4f62c8d1ac24d8ef2473582d8ea9db Mon Sep 17 00:00:00 2001
From: Roy Zang <tie-fei.zang@freescale.com>
Date: Wed, 13 Jun 2007 17:13:42 +0800
Subject: [PATCH] [POWERPC] 85xx: Fix 8548CDS reset bug

Begin with MPC8548 a new reset control register is added that asserts
HRESET_REQ to board logic.

This register is used for chip reset.

Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
---
 arch/powerpc/boot/dts/mpc8548cds.dts |  6 ++++++
 arch/powerpc/platforms/85xx/misc.c   | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/arch/powerpc/boot/dts/mpc8548cds.dts b/arch/powerpc/boot/dts/mpc8548cds.dts
index ad96381..0550a3c 100644
--- a/arch/powerpc/boot/dts/mpc8548cds.dts
+++ b/arch/powerpc/boot/dts/mpc8548cds.dts
@@ -177,6 +177,12 @@
 			interrupt-parent = <&mpic>;
 		};
 
+		global-utilities@e0000 {	//global utilities reg
+			compatible = "fsl,mpc8548-guts";
+			reg = <e0000 1000>;
+			fsl,has-rstcr;
+		};
+
 		pci1: pci@8000 {
 			interrupt-map-mask = <1f800 0 0 7>;
 			interrupt-map = <
diff --git a/arch/powerpc/platforms/85xx/misc.c b/arch/powerpc/platforms/85xx/misc.c
index 3e62fcb..4fe376e 100644
--- a/arch/powerpc/platforms/85xx/misc.c
+++ b/arch/powerpc/platforms/85xx/misc.c
@@ -13,11 +13,43 @@
 #include <linux/irq.h>
 #include <linux/module.h>
 #include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/prom.h>
+#include <sysdev/fsl_soc.h>
+
+static __be32 __iomem *rstcr;
 
 extern void abort(void);
 
+static int __init mpc85xx_rstcr(void)
+{
+	struct device_node *np;
+	np = of_find_node_by_name(NULL, "global-utilities");
+	if ((np && of_get_property(np, "fsl,has-rstcr", NULL))) {
+		const u32 *prop = of_get_property(np, "reg", NULL);
+		if (prop) {
+			/* map reset control register
+			 * 0xE00B0 is offset of reset control register
+			 */
+			rstcr = ioremap(get_immrbase() + *prop + 0xB0, 0xff);
+			if (!rstcr)
+				printk (KERN_EMERG "Error: reset control "
+						"register not mapped!\n");
+		}
+	} else
+		printk (KERN_INFO "rstcr compatible register does not exist!\n");
+	if (np)
+		of_node_put(np);
+	return 0;
+}
+
+arch_initcall(mpc85xx_rstcr);
+
 void mpc85xx_restart(char *cmd)
 {
 	local_irq_disable();
+	if (rstcr)
+		/* set reset control register */
+		out_be32(rstcr, 0x2);	/* HRESET_REQ */
 	abort();
 }
-- 
2.7.4