[U-Boot] [PATCH v4 06/10] 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 v3:
	- No change.

Changes since v2:
	- Replaced #ifdef with if(proid_id_soc()) check.

Changes since v1:
	- Added Reviewed-by & Tested-by.

 arch/arm/cpu/armv7/exynos/soc.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/arch/arm/cpu/armv7/exynos/soc.c b/arch/arm/cpu/armv7/exynos/soc.c
index 8c7d7d8..427f54c 100644
--- a/arch/arm/cpu/armv7/exynos/soc.c
+++ b/arch/arm/cpu/armv7/exynos/soc.c
@@ -13,7 +13,9 @@ enum l2_cache_params {
 	CACHE_TAG_RAM_SETUP = (1 << 9),
 	CACHE_DATA_RAM_SETUP = (1 << 5),
 	CACHE_TAG_RAM_LATENCY = (2 << 6),
-	CACHE_DATA_RAM_LATENCY = (2 << 0)
+	CACHE_DATA_RAM_LATENCY = (2 << 0),
+	CACHE_ENABLE_CLEAN_EVICT = (0 << 3),
+	CACHE_DISABLE_CLEAN_EVICT = (1 << 3)
 };
 
 void reset_cpu(ulong addr)
@@ -37,14 +39,28 @@ static void exynos5_set_l2cache_params(void)
 {
 	unsigned int val = 0;
 
+	/* Read L2CTLR value */
 	asm volatile("mrc p15, 1, %0, c9, c0, 2\n" : "=r"(val));
 
+	/* Set cache setup and latency cycles */
 	val |= CACHE_TAG_RAM_SETUP |
 		CACHE_DATA_RAM_SETUP |
 		CACHE_TAG_RAM_LATENCY |
 		CACHE_DATA_RAM_LATENCY;
 
+	/* Write new vlaue to L2CTLR */
 	asm volatile("mcr p15, 1, %0, c9, c0, 2\n" : : "r"(val));
+
+	if (proid_is_exynos5420() || proid_is_exynos5800()) {
+		/* Read L2ACTLR value */
+		asm volatile("mrc	p15, 1, %0, c15, c0, 0" : "=r" (val));
+
+		/* Disable clean/evict push to external */
+		val |= CACHE_DISABLE_CLEAN_EVICT;
+
+		/* Write new vlaue to L2ACTLR */
+		asm volatile("mcr	p15, 1, %0, c15, c0, 0" : : "r" (val));
+	}
 }
 
 /*
-- 
1.9.1