[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>

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();
+	}
 }
 
 /*

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