diff options
| author | Peng Ma <peng.ma@nxp.com> | 2019-06-13 10:27:08 +0000 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2019-06-25 09:57:41 +0530 |
| commit | 002905eca5bedab08bafd9e325bbbb41670c7712 (patch) | |
| tree | 8f2bb0e3be09201bdb435d8c35add80c97b89751 /drivers/dma/fsl-edma-common.c | |
| parent | c24a5c735f87d0549060de31367c095e8810b895 (diff) | |
| download | lwn-002905eca5bedab08bafd9e325bbbb41670c7712.tar.gz lwn-002905eca5bedab08bafd9e325bbbb41670c7712.zip | |
dmaengine: fsl-edma: support little endian for edma driver
Our platforms with below registers(CHCFG0 - CHCFG15) of eDMA
*-----------------------------------------------------------*
| Offset | Big endian Register| Little endian Register|
|--------------|--------------------|-----------------------|
| 0x0 | CHCFG0 | CHCFG3 |
|--------------|--------------------|-----------------------|
| 0x1 | CHCFG1 | CHCFG2 |
|--------------|--------------------|-----------------------|
| 0x2 | CHCFG2 | CHCFG1 |
|--------------|--------------------|-----------------------|
| 0x3 | CHCFG3 | CHCFG0 |
|--------------|--------------------|-----------------------|
| ... | ...... | ...... |
|--------------|--------------------|-----------------------|
| 0xC | CHCFG12 | CHCFG15 |
|--------------|--------------------|-----------------------|
| 0xD | CHCFG13 | CHCFG14 |
|--------------|--------------------|-----------------------|
| 0xE | CHCFG14 | CHCFG13 |
|--------------|--------------------|-----------------------|
| 0xF | CHCFG15 | CHCFG12 |
*-----------------------------------------------------------*
Current eDMA driver does not support Little endian, so this
patch is to improve edma driver to support little endian.
Signed-off-by: Peng Ma <peng.ma@nxp.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/fsl-edma-common.c')
| -rw-r--r-- | 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 680b2a00a953..6bf238e19d91 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); |