From fc5e709731429bc2db27897630e7c0089f297680 Mon Sep 17 00:00:00 2001
From: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Date: Fri, 5 Mar 2010 03:43:18 +0000
Subject: [PATCH] powerpc/476: add machine check handler for 47x core

The 47x core's MCSR varies from 44x, so it needs it's own machine check
handler.

Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/cputable.h |  1 +
 arch/powerpc/kernel/cputable.c      |  1 +
 arch/powerpc/kernel/traps.c         | 40 +++++++++++++++++++++++++++++
 3 files changed, 42 insertions(+)

diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
index 97ab5089df67..e3cba4e1eb34 100644
--- a/arch/powerpc/include/asm/cputable.h
+++ b/arch/powerpc/include/asm/cputable.h
@@ -72,6 +72,7 @@ extern int machine_check_4xx(struct pt_regs *regs);
 extern int machine_check_440A(struct pt_regs *regs);
 extern int machine_check_e500(struct pt_regs *regs);
 extern int machine_check_e200(struct pt_regs *regs);
+extern int machine_check_47x(struct pt_regs *regs);
 
 /* NOTE WELL: Update identify_cpu() if fields are added or removed! */
 struct cpu_spec {
diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c
index a1d845839727..ad6baf834a76 100644
--- a/arch/powerpc/kernel/cputable.c
+++ b/arch/powerpc/kernel/cputable.c
@@ -1712,6 +1712,7 @@ static struct cpu_spec __initdata cpu_specs[] = {
 			MMU_FTR_USE_TLBIVAX_BCAST | MMU_FTR_LOCK_BCAST_INVAL,
 		.icache_bsize		= 32,
 		.dcache_bsize		= 128,
+		.machine_check		= machine_check_47x,
 		.platform		= "ppc470",
 	},
 	{	/* default match */
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 29d128eb6c43..ca7ce85ebc2e 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -380,6 +380,46 @@ int machine_check_440A(struct pt_regs *regs)
 	}
 	return 0;
 }
+
+int machine_check_47x(struct pt_regs *regs)
+{
+	unsigned long reason = get_mc_reason(regs);
+	u32 mcsr;
+
+	printk(KERN_ERR "Machine check in kernel mode.\n");
+	if (reason & ESR_IMCP) {
+		printk(KERN_ERR
+		       "Instruction Synchronous Machine Check exception\n");
+		mtspr(SPRN_ESR, reason & ~ESR_IMCP);
+		return 0;
+	}
+	mcsr = mfspr(SPRN_MCSR);
+	if (mcsr & MCSR_IB)
+		printk(KERN_ERR "Instruction Read PLB Error\n");
+	if (mcsr & MCSR_DRB)
+		printk(KERN_ERR "Data Read PLB Error\n");
+	if (mcsr & MCSR_DWB)
+		printk(KERN_ERR "Data Write PLB Error\n");
+	if (mcsr & MCSR_TLBP)
+		printk(KERN_ERR "TLB Parity Error\n");
+	if (mcsr & MCSR_ICP) {
+		flush_instruction_cache();
+		printk(KERN_ERR "I-Cache Parity Error\n");
+	}
+	if (mcsr & MCSR_DCSP)
+		printk(KERN_ERR "D-Cache Search Parity Error\n");
+	if (mcsr & PPC47x_MCSR_GPR)
+		printk(KERN_ERR "GPR Parity Error\n");
+	if (mcsr & PPC47x_MCSR_FPR)
+		printk(KERN_ERR "FPR Parity Error\n");
+	if (mcsr & PPC47x_MCSR_IPR)
+		printk(KERN_ERR "Machine Check exception is imprecise\n");
+
+	/* Clear MCSR */
+	mtspr(SPRN_MCSR, mcsr);
+
+	return 0;
+}
 #elif defined(CONFIG_E500)
 int machine_check_e500(struct pt_regs *regs)
 {