[U-Boot] [PATCH v2 07/11] Exynos542x: cache: Disable clean/evict push to external

[Akshay Saraswat]

L2 Auxiliary Control Register provides configuration
and control options for the L2 memory system. Bit 3
of L2ACTLR stands for clean/evict push to external.
Setting bit 3 disables clean/evict which is what
this patch intends to do.

Signed-off-by: Akshay Saraswat <akshay.s at samsung.com>
Reviewed-by: Simon Glass <sjg at chromium.org>
Tested-by: Simon Glass <sjg at chromium.org>
---
Changes since v1:
	- Added Reviewed-by & Tested-by.

 arch/arm/cpu/armv7/exynos/soc.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm/cpu/armv7/exynos/soc.c b/arch/arm/cpu/armv7/exynos/soc.c
index 8c7d7d8..7268b9b 100644
--- a/arch/arm/cpu/armv7/exynos/soc.c
+++ b/arch/arm/cpu/armv7/exynos/soc.c
@@ -45,6 +45,15 @@ static void exynos5_set_l2cache_params(void)
 		CACHE_DATA_RAM_LATENCY;
 
 	asm volatile("mcr p15, 1, %0, c9, c0, 2\n" : : "r"(val));
+
+#ifdef CONFIG_EXYNOS5420
+	/* Read CP15 L2ACTLR value */
+	asm volatile("mrc	p15, 1, %0, c15, c0, 0" : "=r" (val));
+	/* Disable clean/evict push to external */
+	val |= (0x1 << 3);
+	/* Write new vlaue to L2ACTLR */
+	asm volatile("mcr	p15, 1, %0, c15, c0, 0" : : "r" (val));
+#endif
 }
 
 /*
-- 
1.9.1