[PATCH 2/2] ARM: EXYNOS: force mac ip to 32bit dma

[Kukjin Kim]

From: Girish K S <ks.giri at samsung.com>

The synopsys gigabit ethernet ip is compatible
with only 32 bit buffers. so restrict the driver
to use only 32 bit dma mapping.

Signed-off-by: Girish K S <ks.giri at samsung.com>
Signed-off-by: Siva Reddy <siva.kallam at samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim at samsung.com>
---
 arch/arm/mach-exynos/mach-exynos5-dt.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-exynos/mach-exynos5-dt.c b/arch/arm/mach-exynos/mach-exynos5-dt.c
index e47c2a5..9596861 100644
--- a/arch/arm/mach-exynos/mach-exynos5-dt.c
+++ b/arch/arm/mach-exynos/mach-exynos5-dt.c
@@ -25,6 +25,7 @@
 #include "common.h"
 
 static u64 dma_mask64 = DMA_BIT_MASK(64);
+static u64 dma_mask32 = DMA_BIT_MASK(32);
 
 static void __init exynos5_dt_map_io(void)
 {
@@ -41,6 +42,10 @@ static int exynos5440_platform_notifier(struct notifier_block *nb,
 
 	dev->dma_mask = &dma_mask64;
 	dev->coherent_dma_mask = DMA_BIT_MASK(64);
+
+	if (of_device_is_compatible(dev->of_node, "snps,dwmac-3.70a"))
+		dev->dma_mask = &dma_mask32;
+
 	return NOTIFY_OK;
 }
 
-- 
1.7.4.4