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authorIra Snyder <iws@ovro.caltech.edu>2009-05-15 11:33:20 -0700
committerLi Yang <leoli@freescale.com>2009-05-22 16:53:56 +0800
commit776c8943f2766f2819fafd88fdfbaf418ecd6e41 (patch)
tree6309f7faa86f2c0f7b843b9263ccc13bf379ec64
parentbcfb7465c03a8c62c89da374677df56f6b894d44 (diff)
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>
-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 7313a1ae5f8..ff9194d7ebb 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,