linux-kernel - [PATCH 20/32] Blackfin arch: dma

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Message-Id: <11797421863363-git-send-email-bryan.wu@analog.com>
Date:	Mon, 21 May 2007 18:09:28 +0800
From:	Bryan Wu <bryan.wu@...log.com>
To:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Cc:	Aubrey Li <aubrey.li@...log.com>, Bryan Wu <bryan.wu@...log.com>
Subject: [PATCH 20/32] Blackfin arch: dma_memcpy borken for > 64K

From: Aubrey Li <aubrey.li@...log.com>

Signed-off-by: Aubrey Li <aubrey.li@...log.com>
Signed-off-by: Bryan Wu <bryan.wu@...log.com>
---
 arch/blackfin/kernel/bfin_dma_5xx.c |   17 ++++++++++++++++-
 1 files changed, 16 insertions(+), 1 deletions(-)

diff --git a/arch/blackfin/kernel/bfin_dma_5xx.c b/arch/blackfin/kernel/bfin_dma_5xx.c
index 1c344ac..0ccb0dc 100644
--- a/arch/blackfin/kernel/bfin_dma_5xx.c
+++ b/arch/blackfin/kernel/bfin_dma_5xx.c
@@ -595,7 +595,7 @@ unsigned short get_dma_curr_ycount(unsigned int channel)
 }
 EXPORT_SYMBOL(get_dma_curr_ycount);
 
-void *dma_memcpy(void *dest, const void *src, size_t size)
+void *_dma_memcpy(void *dest, const void *src, size_t size)
 {
 	int direction;	/* 1 - address decrease, 0 - address increase */
 	int flag_align;	/* 1 - address aligned,  0 - address unaligned */
@@ -734,6 +734,21 @@ void *dma_memcpy(void *dest, const void *src, size_t size)
 
 	return dest;
 }
+
+void *dma_memcpy(void *dest, const void *src, size_t size)
+{
+	size_t bulk;
+	size_t rest;
+	void * addr;
+
+	bulk = (size >> 16) << 16;
+	rest = size - bulk;
+	if (bulk)
+		_dma_memcpy(dest, src, bulk);
+	addr = _dma_memcpy(dest+bulk, src+bulk, rest);
+	return addr;
+}
+
 EXPORT_SYMBOL(dma_memcpy);
 
 void *safe_dma_memcpy(void *dest, const void *src, size_t size)
-- 
1.5.1.2
-
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