1 files changed, 31 insertions, 11 deletions

diff --git a/arch/arm/mach-exynos/common.c b/arch/arm/mach-exynos/common.c
index c59e18871006..9ff38aa08fd0 100644
--- a/arch/arm/mach-exynos/common.c
+++ b/arch/arm/mach-exynos/common.c
@@ -26,10 +26,12 @@
 #include <asm/hardware/gic.h>
 #include <asm/mach/map.h>
 #include <asm/mach/irq.h>
+#include <asm/cacheflush.h>
 
 #include <mach/regs-irq.h>
 #include <mach/regs-pmu.h>
 #include <mach/regs-gpio.h>
+#include <mach/pmu.h>
 
 #include <plat/cpu.h>
 #include <plat/clock.h>
@@ -441,20 +443,38 @@ core_initcall(exynos4_core_init);
 #ifdef CONFIG_CACHE_L2X0
 static int __init exynos4_l2x0_cache_init(void)
 {
-        /* TAG, Data Latency Control: 2cycle */
-        __raw_writel(0x110, S5P_VA_L2CC + L2X0_TAG_LATENCY_CTRL);
+        if (!(__raw_readl(S5P_VA_L2CC + L2X0_CTRL) & 0x1)) {
+                l2x0_saved_regs.phy_base = EXYNOS4_PA_L2CC;
+                /* TAG, Data Latency Control: 2 cycles */
+                l2x0_saved_regs.tag_latency = 0x110;
 
-        if (soc_is_exynos4210())
-                __raw_writel(0x110, S5P_VA_L2CC + L2X0_DATA_LATENCY_CTRL);
-        else if (soc_is_exynos4212() || soc_is_exynos4412())
-                __raw_writel(0x120, S5P_VA_L2CC + L2X0_DATA_LATENCY_CTRL);
+                if (soc_is_exynos4212() || soc_is_exynos4412())
+                        l2x0_saved_regs.data_latency = 0x120;
+                else
+                        l2x0_saved_regs.data_latency = 0x110;
+
+                l2x0_saved_regs.prefetch_ctrl = 0x30000007;
+                l2x0_saved_regs.pwr_ctrl =
+                        (L2X0_DYNAMIC_CLK_GATING_EN | L2X0_STNDBY_MODE_EN);
+
+                l2x0_regs_phys = virt_to_phys(&l2x0_saved_regs);
 
-        /* L2X0 Prefetch Control */
-        __raw_writel(0x30000007, S5P_VA_L2CC + L2X0_PREFETCH_CTRL);
+                __raw_writel(l2x0_saved_regs.tag_latency,
+                                S5P_VA_L2CC + L2X0_TAG_LATENCY_CTRL);
+                __raw_writel(l2x0_saved_regs.data_latency,
+                                S5P_VA_L2CC + L2X0_DATA_LATENCY_CTRL);
 
-        /* L2X0 Power Control */
-        __raw_writel(L2X0_DYNAMIC_CLK_GATING_EN | L2X0_STNDBY_MODE_EN,
-                     S5P_VA_L2CC + L2X0_POWER_CTRL);
+                /* L2X0 Prefetch Control */
+                __raw_writel(l2x0_saved_regs.prefetch_ctrl,
+                                S5P_VA_L2CC + L2X0_PREFETCH_CTRL);
+
+                /* L2X0 Power Control */
+                __raw_writel(l2x0_saved_regs.pwr_ctrl,
+                                S5P_VA_L2CC + L2X0_POWER_CTRL);
+
+                clean_dcache_area(&l2x0_regs_phys, sizeof(unsigned long));
+                clean_dcache_area(&l2x0_saved_regs, sizeof(struct l2x0_regs));
+        }
 
         l2x0_init(S5P_VA_L2CC, 0x7C470001, 0xC200ffff);