1 files changed, 24 insertions, 1 deletions

diff --git a/arch/arm/mach-ux500/cpu.c b/arch/arm/mach-ux500/cpu.c
index 1da23bb87c16..8aa104a4711a 100644
--- a/arch/arm/mach-ux500/cpu.c
+++ b/arch/arm/mach-ux500/cpu.c
@@ -99,7 +99,27 @@ static void ux500_l2x0_inv_all(void)
         ux500_cache_sync();
 }
 
-static int ux500_l2x0_init(void)
+static int __init ux500_l2x0_unlock(void)
+{
+        int i;
+
+        /*
+         * Unlock Data and Instruction Lock if locked. Ux500 U-Boot versions
+         * apparently locks both caches before jumping to the kernel. The
+         * l2x0 core will not touch the unlock registers if the l2x0 is
+         * already enabled, so we do it right here instead. The PL310 has
+         * 8 sets of registers, one per possible CPU.
+         */
+        for (i = 0; i < 8; i++) {
+                writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_D_BASE +
+                               i * L2X0_LOCKDOWN_STRIDE);
+                writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_I_BASE +
+                               i * L2X0_LOCKDOWN_STRIDE);
+        }
+        return 0;
+}
+
+static int __init ux500_l2x0_init(void)
 {
         if (cpu_is_u5500())
                 l2x0_base = __io_address(U5500_L2CC_BASE);
@@ -108,6 +128,9 @@ static int ux500_l2x0_init(void)
         else
                 ux500_unknown_soc();
 
+        /* Unlock before init */
+        ux500_l2x0_unlock();
+
         /* 64KB way size, 8 way associativity, force WA */
         l2x0_init(l2x0_base, 0x3e060000, 0xc0000fff);