From mboxrd@z Thu Jan 1 00:00:00 1970 From: ccross@android.com (Colin Cross) Date: Sun, 23 Jan 2011 18:01:09 -0800 Subject: [PATCH v2 04/28] ARM: mm: cache-l2x0: Add support for re-enabling l2x0 In-Reply-To: <1295834493-5019-1-git-send-email-ccross@android.com> References: <1295834493-5019-1-git-send-email-ccross@android.com> Message-ID: <1295834493-5019-5-git-send-email-ccross@android.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Remove __init annotation from l2x0_init so it can be used to reinitialize the l2x0 after it has been reset during suspend. Add l2x0_enable to re-enable the l2x0 after l2x0_disable if the l2x0 was not reset. l2x0_disable cannot use writel, as writel calls wmb(), and wmb() may call outer_cache_sync, which takes the same spinlock as l2x0_disable. Signed-off-by: Colin Cross --- arch/arm/include/asm/hardware/cache-l2x0.h | 3 ++- arch/arm/mm/cache-l2x0.c | 14 ++++++++++++-- 2 files changed, 14 insertions(+), 3 deletions(-) diff --git a/arch/arm/include/asm/hardware/cache-l2x0.h b/arch/arm/include/asm/hardware/cache-l2x0.h index 5aeec1e..2b4479f 100644 --- a/arch/arm/include/asm/hardware/cache-l2x0.h +++ b/arch/arm/include/asm/hardware/cache-l2x0.h @@ -72,7 +72,8 @@ #define L2X0_AUX_CTRL_EARLY_BRESP_SHIFT 30 #ifndef __ASSEMBLY__ -extern void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask); +extern void l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask); +extern void l2x0_enable(void); #endif #endif diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c index 170c9bb..e525449 100644 --- a/arch/arm/mm/cache-l2x0.c +++ b/arch/arm/mm/cache-l2x0.c @@ -252,16 +252,26 @@ static void l2x0_flush_range(unsigned long start, unsigned long end) spin_unlock_irqrestore(&l2x0_lock, flags); } +/* enables l2x0 after l2x0_disable, does not invalidate */ +void l2x0_enable(void) +{ + unsigned long flags; + + spin_lock_irqsave(&l2x0_lock, flags); + writel_relaxed(1, l2x0_base + L2X0_CTRL); + 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); + writel_relaxed(0, l2x0_base + L2X0_CTRL); spin_unlock_irqrestore(&l2x0_lock, flags); } -void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask) +void l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask) { __u32 aux; __u32 cache_id; -- 1.7.3.1