From ce72e36ed1a57ba086270039c7d6fac9bf1c5fbc Mon Sep 17 00:00:00 2001 From: Lennert Buytenhek Date: Sat, 9 Aug 2008 15:17:27 +0200 Subject: [PATCH] [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 Signed-off-by: Nicolas Pitre Acked-by: Martin Michlmayr --- arch/arm/mach-orion5x/common.c | 11 +++++++++++ arch/arm/mach-orion5x/include/mach/orion5x.h | 1 + 2 files changed, 12 insertions(+) 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 -- 2.20.1