[ARM] Kirkwood: disable propagation of mbus error to the CPU local bus

Disable propagation of mbus errors to the CPU local bus, as this causes
mbus errors (which can occur for example for PCI aborts) to throw CPU
aborts, which we're not set up to deal with.

Reported-by: Dieter Kiermaier <dk-arm-linux@gmx.de>
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: Nicolas Pitre <nico@marvell.com>

diff --git a/arch/arm/mach-kirkwood/common.c b/arch/arm/mach-kirkwood/common.c
index 7177c4aa63421e22e5f57afcadf00e60a98a79fe..242dd077534336269804795d30c4afb04fe1739b 100644 (file)
--- a/arch/arm/mach-kirkwood/common.c
+++ b/arch/arm/mach-kirkwood/common.c
@@ -915,6 +915,14 @@ void __init kirkwood_init(void)
        kirkwood_uart0_data[0].uartclk = kirkwood_tclk;
        kirkwood_uart1_data[0].uartclk = kirkwood_tclk;
 
+       /*
+        * Disable propagation of mbus errors to the CPU local bus,
+        * as this causes mbus errors (which can occur for example
+        * for PCI aborts) to throw CPU aborts, which we're not set
+        * up to deal with.
+        */
+       writel(readl(CPU_CONFIG) & ~CPU_CONFIG_ERROR_PROP, CPU_CONFIG);
+
        kirkwood_setup_cpu_mbus();
 
 #ifdef CONFIG_CACHE_FEROCEON_L2

diff --git a/arch/arm/mach-kirkwood/include/mach/bridge-regs.h b/arch/arm/mach-kirkwood/include/mach/bridge-regs.h
index 9e80d9232c831e315783509b71a837de115b92b9..418f5017c50e1d916468ebc99e5b958a706d98f6 100644 (file)
--- a/arch/arm/mach-kirkwood/include/mach/bridge-regs.h
+++ b/arch/arm/mach-kirkwood/include/mach/bridge-regs.h
@@ -13,6 +13,9 @@
 
 #include <mach/kirkwood.h>
 
+#define CPU_CONFIG             (BRIDGE_VIRT_BASE | 0x0100)
+#define CPU_CONFIG_ERROR_PROP  0x00000004
+
 #define CPU_CONTROL            (BRIDGE_VIRT_BASE | 0x0104)
 #define CPU_RESET              0x00000002