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

Message ID 1421329328-18070-6-git-send-email-akshay.s@samsung.com
State Changes Requested
Delegated to: Minkyu Kang
Headers show

Commit Message

Akshay Saraswat Jan. 15, 2015, 1:42 p.m. UTC 
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@samsung.com>
---
 arch/arm/cpu/armv7/exynos/soc.c | 9 +++++++++
 1 file changed, 9 insertions(+)

Comments

Simon Glass Jan. 28, 2015, 4:10 a.m. UTC | #1 
On 15 January 2015 at 06:42, Akshay Saraswat <akshay.s@samsung.com> wrote:
> 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@samsung.com>
> ---
>  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
>  }

Reviewed-by: Simon Glass <sjg@chromium.org>

Tested on snow, pit, pi
Tested-by: Simon Glass <sjg@chromium.org>
diff mbox

Patch

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
 }
 
 /*