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-rw-r--r--arch/arm/mm/cache-l2x0.c25
1 files changed, 16 insertions, 9 deletions
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index b480f1d3591..747f9a9021b 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -99,18 +99,25 @@ void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
l2x0_base = base;
- /* disable L2X0 */
- writel(0, l2x0_base + L2X0_CTRL);
+ /*
+ * Check if l2x0 controller is already enabled.
+ * If you are booting from non-secure mode
+ * accessing the below registers will fault.
+ */
+ if (!(readl(l2x0_base + L2X0_CTRL) & 1)) {
- aux = readl(l2x0_base + L2X0_AUX_CTRL);
- aux &= aux_mask;
- aux |= aux_val;
- writel(aux, l2x0_base + L2X0_AUX_CTRL);
+ /* l2x0 controller is disabled */
- l2x0_inv_all();
+ aux = readl(l2x0_base + L2X0_AUX_CTRL);
+ aux &= aux_mask;
+ aux |= aux_val;
+ writel(aux, l2x0_base + L2X0_AUX_CTRL);
- /* enable L2X0 */
- writel(1, l2x0_base + L2X0_CTRL);
+ l2x0_inv_all();
+
+ /* enable L2X0 */
+ writel(1, l2x0_base + L2X0_CTRL);
+ }
outer_cache.inv_range = l2x0_inv_range;
outer_cache.clean_range = l2x0_clean_range;