[PATCH] ppc32: add 440GX erratum 440_43 workaround

This patch adds workaround for PPC 440GX erratum 440_43. According to
this erratum spurious MachineChecks (caused by L1 cache parity) can
happen during DataTLB miss processing. We disable L1 cache parity
checking for 440GX rev.C and rev.F

Signed-off-by: Eugene Surovegin <ebs@ebshome.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>

4 files changed, 18 insertions, 2 deletions

diff --git a/arch/ppc/platforms/4xx/ocotea.c b/arch/ppc/platforms/4xx/ocotea.c
index f841972f1fa9..554776d4b8ac 100644
--- a/arch/ppc/platforms/4xx/ocotea.c
+++ b/arch/ppc/platforms/4xx/ocotea.c
@@ -331,7 +331,7 @@ static void __init ocotea_init(void)
 void __init platform_init(unsigned long r3, unsigned long r4,
                 unsigned long r5, unsigned long r6, unsigned long r7)
 {
-        ibm44x_platform_init(r3, r4, r5, r6, r7);
+        ibm440gx_platform_init(r3, r4, r5, r6, r7);
 
         ppc_md.setup_arch = ocotea_setup_arch;
         ppc_md.show_cpuinfo = ocotea_show_cpuinfo;
diff --git a/arch/ppc/syslib/ibm440gx_common.c b/arch/ppc/syslib/ibm440gx_common.c
index a7dd55f1c63e..f6cc16888527 100644
--- a/arch/ppc/syslib/ibm440gx_common.c
+++ b/arch/ppc/syslib/ibm440gx_common.c
@@ -2,7 +2,7 @@
  * PPC440GX system library
  *
  * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
- * Copyright (c) 2003, 2004 Zultys Technologies
+ * Copyright (c) 2003 - 2006 Zultys Technologies
  *
  * 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
@@ -282,3 +282,14 @@ int ibm440gx_show_cpuinfo(struct seq_file *m){
         return 0;
 }
 
+void __init ibm440gx_platform_init(unsigned long r3, unsigned long r4,
+                                   unsigned long r5, unsigned long r6,
+                                   unsigned long r7)
+{
+        /* Erratum 440_43 workaround, disable L1 cache parity checking */
+        if (!strcmp(cur_cpu_spec->cpu_name, "440GX Rev. C") ||
+            !strcmp(cur_cpu_spec->cpu_name, "440GX Rev. F"))
+                mtspr(SPRN_CCR1, mfspr(SPRN_CCR1) | CCR1_DPC);
+
+        ibm44x_platform_init(r3, r4, r5, r6, r7);
+}
diff --git a/arch/ppc/syslib/ibm440gx_common.h b/arch/ppc/syslib/ibm440gx_common.h
index a2ab9fab8e34..a03ec6022e8f 100644
--- a/arch/ppc/syslib/ibm440gx_common.h
+++ b/arch/ppc/syslib/ibm440gx_common.h
@@ -29,6 +29,10 @@
 void ibm440gx_get_clocks(struct ibm44x_clocks*, unsigned int sys_clk,
         unsigned int ser_clk) __init;
 
+/* common 440GX platform init */
+void ibm440gx_platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
+                            unsigned long r6, unsigned long r7) __init;
+
 /* Enable L2 cache */
 void ibm440gx_l2c_enable(void) __init;
 
diff --git a/include/asm-ppc/reg_booke.h b/include/asm-ppc/reg_booke.h
index 00ad9c754c78..4944c0fb8bea 100644
--- a/include/asm-ppc/reg_booke.h
+++ b/include/asm-ppc/reg_booke.h
@@ -237,6 +237,7 @@ do {						\
 #endif
 
 /* Bit definitions for CCR1. */
+#define CCR1_DPC        0x00000100 /* Disable L1 I-Cache/D-Cache parity checking */
 #define CCR1_TCS        0x00000080 /* Timer Clock Select */
 
 /* Bit definitions for the MCSR. */