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authorRussell King <rmk+kernel@arm.linux.org.uk>2010-10-28 14:42:06 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-10-28 14:42:06 +0100
commitbe6786ac738801d39cfd264ec88c352efd029578 (patch)
tree3652ce6cfbfdb1dbb8cf5a664e5e84c6d3abd260 /arch/arm/mach-ux500
parentf9cef506815386df4bd7e463b59e0a0984ce0355 (diff)
parentae6948048c417d429b8a0f85fad13e483f7cc1a3 (diff)
downloadblackbird-op-linux-be6786ac738801d39cfd264ec88c352efd029578.tar.gz
blackbird-op-linux-be6786ac738801d39cfd264ec88c352efd029578.zip
Merge branch 'l2x0-pull-rmk' of git://dev.omapzoom.org/pub/scm/santosh/kernel-omap4-base into devel-stable
Diffstat (limited to 'arch/arm/mach-ux500')
-rw-r--r--arch/arm/mach-ux500/cpu.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/arm/mach-ux500/cpu.c b/arch/arm/mach-ux500/cpu.c
index e0fd747e447a..73fb1a551ec6 100644
--- a/arch/arm/mach-ux500/cpu.c
+++ b/arch/arm/mach-ux500/cpu.c
@@ -10,6 +10,7 @@
#include <linux/io.h>
#include <linux/clk.h>
+#include <asm/cacheflush.h>
#include <asm/hardware/cache-l2x0.h>
#include <asm/hardware/gic.h>
#include <asm/mach/map.h>
@@ -71,6 +72,46 @@ void __init ux500_init_irq(void)
}
#ifdef CONFIG_CACHE_L2X0
+static inline void ux500_cache_wait(void __iomem *reg, unsigned long mask)
+{
+ /* wait for the operation to complete */
+ while (readl(reg) & mask)
+ ;
+}
+
+static inline void ux500_cache_sync(void)
+{
+ void __iomem *base = __io_address(UX500_L2CC_BASE);
+ writel(0, base + L2X0_CACHE_SYNC);
+ ux500_cache_wait(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)
+{
+ void __iomem *l2x0_base = __io_address(UX500_L2CC_BASE);
+ uint32_t l2x0_way_mask = (1<<16) - 1; /* Bitmask of active ways */
+
+ /* invalidate all ways */
+ writel(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)
{
void __iomem *l2x0_base;
@@ -80,6 +121,10 @@ static int ux500_l2x0_init(void)
/* 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);
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