[ARM] Orion: support D0 5281 silicon

On D0 5281 SoCs, we need to disable the wait-for-interrupt
instruction due to an erratum.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: Nicolas Pitre <nico@marvell.com>
Acked-by: Martin Michlmayr <tbm@cyrius.com>

diff --git a/arch/arm/mach-orion5x/common.c b/arch/arm/mach-orion5x/common.c
index b44f26d..8f2146b 100644 (file)
--- a/arch/arm/mach-orion5x/common.c
+++ b/arch/arm/mach-orion5x/common.c
@@ -382,6 +382,8 @@ static void __init orion5x_id(u32 *dev, u32 *rev, char **dev_name)
                        *dev_name = "MV88F5281-D2";
                } else if (*rev == MV88F5281_REV_D1) {
                        *dev_name = "MV88F5281-D1";
+               } else if (*rev == MV88F5281_REV_D0) {
+                       *dev_name = "MV88F5281-D0";
                } else {
                        *dev_name = "MV88F5281-Rev-Unsupported";
                }
@@ -416,6 +418,15 @@ void __init orion5x_init(void)
         * Setup Orion address map
         */
        orion5x_setup_cpu_mbus_bridge();
+
+       /*
+        * Don't issue "Wait for Interrupt" instruction if we are
+        * running on D0 5281 silicon.
+        */
+       if (dev == MV88F5281_DEV_ID && rev == MV88F5281_REV_D0) {
+               printk(KERN_INFO "Orion: Applying 5281 D0 WFI workaround.\n");
+               disable_hlt();
+       }
 }
 
 /*

diff --git a/arch/arm/mach-orion5x/include/mach/orion5x.h b/arch/arm/mach-orion5x/include/mach/orion5x.h
index f52a7d6..77978db 100644 (file)
--- a/arch/arm/mach-orion5x/include/mach/orion5x.h
+++ b/arch/arm/mach-orion5x/include/mach/orion5x.h
@@ -73,6 +73,7 @@
 #define MV88F5182_REV_A2       2
 /* Orion-2 (88F5281) */
 #define MV88F5281_DEV_ID       0x5281
+#define MV88F5281_REV_D0       4
 #define MV88F5281_REV_D1       5
 #define MV88F5281_REV_D2       6