[ARM] Kirkwood: add support for L2 cache WB/WT selection

Feroceon L2 cache can work in eighther write through or write back mode
on Kirkwood. Add the option to configure this mode according to Kconfig.

Signed-off-by: Ronen Shitrit <rshitrit@marvell.com>
Signed-off-by: Nicolas Pitre <nico@marvell.com>

1 files changed, 9 insertions, 3 deletions

diff --git a/arch/arm/mach-kirkwood/common.c b/arch/arm/mach-kirkwood/common.c
index c8516e352d1..85cad05d8c5 100644
--- a/arch/arm/mach-kirkwood/common.c
+++ b/arch/arm/mach-kirkwood/common.c
@@ -588,9 +588,15 @@ static char * __init kirkwood_id(void)
         }
 }
 
-static int __init is_l2_writethrough(void)
+static void __init kirkwood_l2_init(void)
 {
-        return !!(readl(L2_CONFIG_REG) & L2_WRITETHROUGH);
+#ifdef CONFIG_CACHE_FEROCEON_L2_WRITETHROUGH
+        writel(readl(L2_CONFIG_REG) | L2_WRITETHROUGH, L2_CONFIG_REG);
+        feroceon_l2_init(1);
+#else
+        writel(readl(L2_CONFIG_REG) & ~L2_WRITETHROUGH, L2_CONFIG_REG);
+        feroceon_l2_init(0);
+#endif
 }
 
 void __init kirkwood_init(void)
@@ -605,6 +611,6 @@ void __init kirkwood_init(void)
         kirkwood_setup_cpu_mbus();
 
 #ifdef CONFIG_CACHE_FEROCEON_L2
-        feroceon_l2_init(is_l2_writethrough());
+        kirkwood_l2_init();
 #endif
 }