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 <aksha...@samsung.com>
Reviewed-by: Simon Glass <s...@chromium.org>
Tested-by: Simon Glass <s...@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
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