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arm: Implement l2x0 cache disable functions 

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>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
This commit is contained in:
Thomas Gleixner 2010-07-31 21:05:24 +05:30 committed by Santosh Shilimkar
parent ae360a78f4
commit 2fd8658931
1 changed files with 27 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
arch/arm/mm/cache-l2x0.c
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@ -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",