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

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>
hifive-unleashed-5.1
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
*/
#include <linux/init.h>
#include <linux/spinlock.h>
#include <asm/cacheflush.h>
#include <asm/io.h>
@ -25,14 +26,19 @@
#define CACHE_LINE_SIZE 32
static void __iomem *l2x0_base;
static DEFINE_SPINLOCK(l2x0_lock);
static inline void sync_writel(unsigned long val, unsigned long reg,
unsigned long complete_mask)
{
unsigned long flags;
spin_lock_irqsave(&l2x0_lock, flags);
writel(val, l2x0_base + reg);
/* wait for the operation to complete */
while (readl(l2x0_base + reg) & complete_mask)
;
spin_unlock_irqrestore(&l2x0_lock, flags);
}
static inline void cache_sync(void)