From: msalter@redhat.com (Mark Salter)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/3] define ARM-specific dma_coherent_write_sync
Date: Wed, 31 Aug 2011 17:30:13 -0400 [thread overview]
Message-ID: <1314826214-22428-3-git-send-email-msalter@redhat.com> (raw)
In-Reply-To: <1314826214-22428-1-git-send-email-msalter@redhat.com>
For ARM kernels using CONFIG_ARM_DMA_MEM_BUFFERABLE, this patch adds an ARM
specific dma_coherent_write_sync() to override the default version. This
routine forces out any data sitting in a write buffer between the CPU and
memory.
Signed-off-by: Mark Salter <msalter@redhat.com>
---
arch/arm/include/asm/dma-mapping.h | 10 ++++++++++
1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index 7a21d0b..e99562b 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -206,6 +206,16 @@ int dma_mmap_writecombine(struct device *, struct vm_area_struct *,
void *, dma_addr_t, size_t);
+#ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE
+#define ARCH_HAS_DMA_COHERENT_WRITE_SYNC
+
+static inline void dma_coherent_write_sync(void)
+{
+ dsb();
+ outer_sync();
+}
+#endif
+
#ifdef CONFIG_DMABOUNCE
/*
* For SA-1111, IXP425, and ADI systems the dma-mapping functions are "magic"
--
1.7.6
next prev parent reply other threads:[~2011-08-31 21:30 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-31 21:30 [PATCH 0/3] RFC: addition to DMA API Mark Salter
2011-08-31 21:30 ` [PATCH 1/3] add dma_coherent_write_sync " Mark Salter
2011-09-01 2:59 ` Josh Cartwright
2011-09-01 9:57 ` Michał Mirosław
2011-09-01 12:36 ` Mark Salter
2011-09-06 14:30 ` Catalin Marinas
2011-08-31 21:30 ` Mark Salter [this message]
2011-09-06 14:32 ` [PATCH 2/3] define ARM-specific dma_coherent_write_sync Catalin Marinas
2011-09-06 14:37 ` Mark Salter
2011-09-06 14:48 ` Catalin Marinas
2011-09-06 15:02 ` Mark Salter
2011-10-03 1:40 ` Jon Masters
2011-10-03 8:44 ` Catalin Marinas
2011-10-03 9:24 ` Jon Masters
2011-08-31 21:30 ` [PATCH 3/3] add dma_coherent_write_sync calls to USB EHCI driver Mark Salter
2011-09-01 2:33 ` Ming Lei
2011-09-01 2:09 ` [PATCH 0/3] RFC: addition to DMA API Ming Lei
2011-09-01 3:09 ` Alan Stern
2011-09-01 3:41 ` Ming Lei
2011-09-01 8:45 ` Will Deacon
2011-09-01 9:14 ` Ming Lei
2011-09-01 15:42 ` Alan Stern
2011-09-01 16:04 ` Russell King - ARM Linux
2011-09-01 17:31 ` Will Deacon
2011-09-01 18:07 ` Russell King - ARM Linux
2011-09-01 19:14 ` Mark Salter
2011-09-01 15:22 ` Alan Stern
2011-09-01 15:56 ` Ming Lei
2011-09-01 16:48 ` Alan Stern
2011-09-02 0:59 ` Ming Lei
2011-09-02 13:53 ` Alan Stern
2011-09-01 9:11 ` Will Deacon
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