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authorIra Snyder <iws@ovro.caltech.edu>2009-05-15 22:33:20 +0400
committerLi Yang <leoli@freescale.com>2009-05-22 12:53:56 +0400
commit776c8943f2766f2819fafd88fdfbaf418ecd6e41 (patch)
tree6309f7faa86f2c0f7b843b9263ccc13bf379ec64 /drivers/dma
parentbcfb7465c03a8c62c89da374677df56f6b894d44 (diff)
downloadlinux-776c8943f2766f2819fafd88fdfbaf418ecd6e41.tar.xz
fsldma: snooping is not enabled for last entry in descriptor chain
On the 83xx controller, snooping is necessary for the DMA controller to ensure cache coherence with the CPU when transferring to/from RAM. The last descriptor in a chain will always have the End-of-Chain interrupt bit set, so we can set the snoop bit while adding the End-of-Chain interrupt bit. Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu> Signed-off-by: Li Yang <leoli@freescale.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/fsldma.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index 7313a1ae5f83..ff9194d7ebb7 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -179,9 +179,14 @@ static void dma_halt(struct fsl_dma_chan *fsl_chan)
static void set_ld_eol(struct fsl_dma_chan *fsl_chan,
struct fsl_desc_sw *desc)
{
+ u64 snoop_bits;
+
+ snoop_bits = ((fsl_chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_83XX)
+ ? FSL_DMA_SNEN : 0;
+
desc->hw.next_ln_addr = CPU_TO_DMA(fsl_chan,
- DMA_TO_CPU(fsl_chan, desc->hw.next_ln_addr, 64) | FSL_DMA_EOL,
- 64);
+ DMA_TO_CPU(fsl_chan, desc->hw.next_ln_addr, 64) | FSL_DMA_EOL
+ | snoop_bits, 64);
}
static void append_ld_queue(struct fsl_dma_chan *fsl_chan,