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[ARM] 4500/1: Add locking around the background L2x0 cache operations

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The background operations of the L2x0 cache controllers are aborted if
another operation is issued on the same or different core. This patch
protects the maintenance operation issuing/polling with a spinlock.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Catalin Marinas 2007-07-20 11:42:40 +01:00 committed by Russell King
parent 13a63ab289
commit 0762097625
1 changed files with 6 additions and 0 deletions
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6
arch/arm/mm/cache-l2x0.c
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@ -17,6 +17,7 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/ */
#include <linux/init.h> #include <linux/init.h>
#include <linux/spinlock.h>
#include <asm/cacheflush.h> #include <asm/cacheflush.h>
#include <asm/io.h> #include <asm/io.h>
@ -25,14 +26,19 @@
#define CACHE_LINE_SIZE 32 #define CACHE_LINE_SIZE 32
static void __iomem *l2x0_base; static void __iomem *l2x0_base;
static DEFINE_SPINLOCK(l2x0_lock);
static inline void sync_writel(unsigned long val, unsigned long reg, static inline void sync_writel(unsigned long val, unsigned long reg,
unsigned long complete_mask) unsigned long complete_mask)
{ {
unsigned long flags;
spin_lock_irqsave(&l2x0_lock, flags);
writel(val, l2x0_base + reg); writel(val, l2x0_base + reg);
/* wait for the operation to complete */ /* wait for the operation to complete */
while (readl(l2x0_base + reg) & complete_mask) while (readl(l2x0_base + reg) & complete_mask)
; ;
spin_unlock_irqrestore(&l2x0_lock, flags);
} }
static inline void cache_sync(void) static inline void cache_sync(void)