mach-ux500: factor out l2x0 handling code

Following mach-imx we break out the l2x0 handling into its
own file, avoiding some ifdefs. Also remove unnecessary creation
of local pointers when there is already one file-local readily
available.

Cc: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Cc: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

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 0000000..9d09e4d
--- /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);