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ARM: Improve the L2 cache performance when PL310 is used

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With this L2 cache controller, the cache maintenance by PA and sync
operations are atomic and do not require a "wait" loop. This patch
conditionally defines the cache_wait() function.

Since L2x0 cache controllers do not work with ARMv7 CPUs, the patch
automatically enables CACHE_PL310 when only CPU_V7 is defined.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Catalin Marinas 2010-08-31 13:05:22 +01:00 committed by Santosh Shilimkar
parent 899611ee7d
commit 9a6655e49f
2 changed files with 20 additions and 3 deletions
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8
arch/arm/mm/Kconfig
View file

@ -779,6 +779,14 @@ config CACHE_L2X0
help
This option enables the L2x0 PrimeCell.
config CACHE_PL310
bool
depends on CACHE_L2X0
default y if CPU_V7 && !CPU_V6
help
This option enables optimisations for the PL310 cache
controller.
config CACHE_TAUROS2
bool "Enable the Tauros2 L2 cache controller"
depends on (ARCH_DOVE || ARCH_MMP)

15
arch/arm/mm/cache-l2x0.c
View file

@ -29,13 +29,22 @@ static void __iomem *l2x0_base;
static DEFINE_SPINLOCK(l2x0_lock);
static uint32_t l2x0_way_mask; /* Bitmask of active ways */
static inline void cache_wait(void __iomem *reg, unsigned long mask)
static inline void cache_wait_way(void __iomem *reg, unsigned long mask)
{
/* wait for the operation to complete */
/* wait for cache operation by line or way to complete */
while (readl_relaxed(reg) & mask)
;
}
#ifdef CONFIG_CACHE_PL310
static inline void cache_wait(void __iomem *reg, unsigned long mask)
{
/* cache operations by line are atomic on PL310 */
}
#else
#define cache_wait cache_wait_way
#endif
static inline void cache_sync(void)
{
void __iomem *base = l2x0_base;
@ -110,7 +119,7 @@ static inline void l2x0_inv_all(void)
/* invalidate all ways */
spin_lock_irqsave(&l2x0_lock, flags);
writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_INV_WAY);
cache_wait(l2x0_base + L2X0_INV_WAY, l2x0_way_mask);
cache_wait_way(l2x0_base + L2X0_INV_WAY, l2x0_way_mask);
cache_sync();
spin_unlock_irqrestore(&l2x0_lock, flags);
}