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Diffstat (limited to 'arch/arm/mach-ux500/cache-l2x0.c')
-rw-r--r--arch/arm/mach-ux500/cache-l2x0.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/arch/arm/mach-ux500/cache-l2x0.c b/arch/arm/mach-ux500/cache-l2x0.c
new file mode 100644
index 000000000000..9d09e4d013b9
--- /dev/null
+++ b/arch/arm/mach-ux500/cache-l2x0.c
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2011
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#include <linux/io.h>
+#include <asm/cacheflush.h>
+#include <asm/hardware/cache-l2x0.h>
+#include <mach/hardware.h>
+#include <mach/id.h>
+
+static void __iomem *l2x0_base;
+
+static inline void ux500_cache_wait(void __iomem *reg, unsigned long mask)
+{
+ /* wait for the operation to complete */
+ while (readl_relaxed(reg) & mask)
+ cpu_relax();
+}
+
+static inline void ux500_cache_sync(void)
+{
+ writel_relaxed(0, l2x0_base + L2X0_CACHE_SYNC);
+ ux500_cache_wait(l2x0_base + L2X0_CACHE_SYNC, 1);
+}
+
+/*
+ * The L2 cache cannot be turned off in the non-secure world.
+ * Dummy until a secure service is in place.
+ */
+static void ux500_l2x0_disable(void)
+{
+}
+
+/*
+ * This is only called when doing a kexec, just after turning off the L2
+ * and L1 cache, and it is surrounded by a spinlock in the generic version.
+ * However, we're not really turning off the L2 cache right now and the
+ * PL310 does not support exclusive accesses (used to implement the spinlock).
+ * So, the invalidation needs to be done without the spinlock.
+ */
+static void ux500_l2x0_inv_all(void)
+{
+ uint32_t l2x0_way_mask = (1<<16) - 1; /* Bitmask of active ways */
+
+ /* invalidate all ways */
+ writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_INV_WAY);
+ ux500_cache_wait(l2x0_base + L2X0_INV_WAY, l2x0_way_mask);
+ ux500_cache_sync();
+}
+
+static int ux500_l2x0_init(void)
+{
+ if (cpu_is_u5500())
+ l2x0_base = __io_address(U5500_L2CC_BASE);
+ else if (cpu_is_u8500())
+ l2x0_base = __io_address(U8500_L2CC_BASE);
+ else
+ ux500_unknown_soc();
+
+ /* 64KB way size, 8 way associativity, force WA */
+ l2x0_init(l2x0_base, 0x3e060000, 0xc0000fff);
+
+ /* Override invalidate function */
+ outer_cache.disable = ux500_l2x0_disable;
+ outer_cache.inv_all = ux500_l2x0_inv_all;
+
+ return 0;
+}
+
+early_initcall(ux500_l2x0_init);