[PATCH 3/4] dmaengine: fsl-edma: support little endian for edma driver

Peng Ma
2019-05-06T09:11:50Z

improve edma driver to support little endian.

Signed-off-by: Peng Ma <peng.ma@nxp.com>
---
drivers/dma/fsl-edma-common.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c
index 680b2a0..6bf238e 100644
--- a/drivers/dma/fsl-edma-common.c
+++ b/drivers/dma/fsl-edma-common.c
@@ -83,9 +83,14 @@ void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
u32 ch = fsl_chan->vchan.chan.chan_id;
void __iomem *muxaddr;
unsigned int chans_per_mux, ch_off;
+ int endian_diff[4] = {3, 1, -1, -3};

chans_per_mux = fsl_chan->edma->n_chans / DMAMUX_NR;
ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux;
+
+ if (!fsl_chan->edma->big_endian)
+ ch_off += endian_diff[ch_off % 4];
+
muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux];
slot = EDMAMUX_CHCFG_SOURCE(slot);

--
1.7.1