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@linutronix.de>
Index: linux-2.6/arch/arm/mm/cache-l2x0.c
===================================================================
--- linux-2.6.orig/arch/arm/mm/cache-l2x0.c
+++ linux-2.6/arch/arm/mm/cache-l2x0.c
@@ -103,12 +103,26 @@ 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(l2x0_way_mask, l2x0_base + L2X0_CLEAN_INV_WAY);
+	cache_wait(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(l2x0_way_mask, l2x0_base + L2X0_INV_WAY);
 	cache_wait(l2x0_base + L2X0_INV_WAY, l2x0_way_mask);
 	cache_sync();
@@ -206,6 +220,15 @@ static void l2x0_flush_range(unsigned lo
 	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;
@@ -262,6 +285,9 @@ void __init l2x0_init(void __iomem *base
 	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",