From: Thomas Gleixner <[tglx@xxxxxxxxxxxxx]>
Add flush_all, inv_all and disable functions to the l2x0 code. These
functions are called from kexec code to prevent random crashes in the
new kernel.
Platforms like OMAP which control L2 enable/disable via SMI mode can
override the outer_cache.disable() function to implement their own.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
---
arch/arm/mm/cache-l2x0.c | 28 +++++++++++++++++++++++++++-
1 files changed, 27 insertions(+), 1 deletions(-)
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index edb43ff..9310d61 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -112,12 +112,26 @@ static void l2x0_cache_sync(void)
spin_unlock_irqrestore(&l2x0_lock, flags);
}
-static inline void l2x0_inv_all(void)
+static void l2x0_flush_all(void)
+{
+ unsigned long flags;
+
+ /* clean all ways */
+ spin_lock_irqsave(&l2x0_lock, flags);
+ writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_CLEAN_INV_WAY);
+ cache_wait_way(l2x0_base + L2X0_CLEAN_INV_WAY, l2x0_way_mask);
+ cache_sync();
+ spin_unlock_irqrestore(&l2x0_lock, flags);
+}
+
+static void l2x0_inv_all(void)
{
unsigned long flags;
/* invalidate all ways */
spin_lock_irqsave(&l2x0_lock, flags);
+ /* Invalidating when L2 is enabled is a nono */
+ BUG_ON(readl(l2x0_base + L2X0_CTRL) & 1);
writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_INV_WAY);
cache_wait_way(l2x0_base + L2X0_INV_WAY, l2x0_way_mask);
cache_sync();
@@ -215,6 +229,15 @@ static void l2x0_flush_range(unsigned long start, unsigned long end)
spin_unlock_irqrestore(&l2x0_lock, flags);
}
+static void l2x0_disable(void)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&l2x0_lock, flags);
+ writel(0, l2x0_base + L2X0_CTRL);
+ spin_unlock_irqrestore(&l2x0_lock, flags);
+}
+
void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
{
__u32 aux;
@@ -272,6 +295,9 @@ void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
outer_cache.clean_range = l2x0_clean_range;
outer_cache.flush_range = l2x0_flush_range;
outer_cache.sync = l2x0_cache_sync;
+ outer_cache.flush_all = l2x0_flush_all;
+ outer_cache.inv_all = l2x0_inv_all;
+ outer_cache.disable = l2x0_disable;
printk(KERN_INFO "%s cache controller enabled\n", type);
printk(KERN_INFO "l2x0: %d ways, CACHE_ID 0x%08x, AUX_CTRL 0x%08x\n",
--
1.6.0.4
--
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