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| author | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2013-07-29 17:42:14 +0200 |
|---|---|---|
| committer | Dan Williams <djbw@fb.com> | 2013-08-22 22:57:37 -0700 |
| commit | e03bc654f85604bcd5304debb597f398d1d03778 (patch) | |
| tree | 380052c9f15b3b01034dac678acc1b3fcf21bf37 /drivers/dma/mv_xor.c | |
| parent | 5733c38ae3473115ac7df3fe19bd2502149d8c51 (diff) | |
| download | linux-e03bc654f85604bcd5304debb597f398d1d03778.tar.bz2 | |
mv_xor: support big endian systems using descriptor swap feature
The mv_xor driver had never been used in a big-endian context, and
therefore was not using the hardware features to support such an
execution environment. The hardware provides a "descriptor swap" bit
that automatically swaps the bytes of the DMA descriptors, within
blocks of 8 bytes. This requires a different DMA descriptor layout on
big-endian systems, as well as enabling this "descriptor swap" bit.
This mechanism is exactly identical to the one already used in the
mv643xx_eth network driver and the mvneta network driver.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Dan Williams <djbw@fb.com>
Diffstat (limited to 'drivers/dma/mv_xor.c')
| -rw-r--r-- | drivers/dma/mv_xor.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c index c026b27f76e1..d332b9e3f9ce 100644 --- a/drivers/dma/mv_xor.c +++ b/drivers/dma/mv_xor.c @@ -64,7 +64,7 @@ static u32 mv_desc_get_src_addr(struct mv_xor_desc_slot *desc, int src_idx) { struct mv_xor_desc *hw_desc = desc->hw_desc; - return hw_desc->phy_src_addr[src_idx]; + return hw_desc->phy_src_addr[mv_phy_src_idx(src_idx)]; } @@ -107,7 +107,7 @@ static void mv_desc_set_src_addr(struct mv_xor_desc_slot *desc, int index, dma_addr_t addr) { struct mv_xor_desc *hw_desc = desc->hw_desc; - hw_desc->phy_src_addr[index] = addr; + hw_desc->phy_src_addr[mv_phy_src_idx(index)] = addr; if (desc->type == DMA_XOR) hw_desc->desc_command |= (1 << index); } @@ -192,6 +192,13 @@ static void mv_set_mode(struct mv_xor_chan *chan, config &= ~0x7; config |= op_mode; + +#if defined(__BIG_ENDIAN) + config |= XOR_DESCRIPTOR_SWAP; +#else + config &= ~XOR_DESCRIPTOR_SWAP; +#endif + writel_relaxed(config, XOR_CONFIG(chan)); chan->current_type = type; } |