[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>

2 files changed, 12 insertions, 0 deletions

diff --git a/arch/arm/mach-orion5x/common.c b/arch/arm/mach-orion5x/common.c
index b44f26d7613b..8f2146bd8a94 100644
--- 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 f52a7d65bec2..77978dbd5a92 100644
--- 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