dmaengine: imx-sdma: Add FIFO stride support for multi FIFO script

The peripheral may have several FIFOs, but some case just select
some FIFOs from them for data transfer, which means FIFO0 and FIFO2
may be selected. So add FIFO address stride support, 0 means all FIFOs
are continuous, 1 means 1 word stride between FIFOs. All stride between
FIFOs should be same.

Another option words_per_fifo means how many audio channel data copied
to one FIFO one time, 1 means one channel per FIFO, 2 means 2 channels
per FIFO.

If 'n_fifos_src =  4' and 'words_per_fifo = 2', it means the first two
words(channels) fetch from FIFO0 and then jump to FIFO1 for next two words,
and so on after the last FIFO3 fetched, roll back to FIFO0.

Signed-off-by: Joy Zou <joy.zou@nxp.com>
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://lore.kernel.org/r/1657162829-9273-1-git-send-email-shengjiu.wang@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/linux/dma/imx-dma.h b/include/linux/dma/imx-dma.h
index 8887762360d4..f487a4fa103a 100644
--- a/include/linux/dma/imx-dma.h
+++ b/include/linux/dma/imx-dma.h
@@ -70,6 +70,16 @@ static inline int imx_dma_is_general_purpose(struct dma_chan *chan)
  * struct sdma_peripheral_config - SDMA config for audio
  * @n_fifos_src: Number of FIFOs for recording
  * @n_fifos_dst: Number of FIFOs for playback
+ * @stride_fifos_src: FIFO address stride for recording, 0 means all FIFOs are
+ *                    continuous, 1 means 1 word stride between FIFOs. All stride
+ *                    between FIFOs should be same.
+ * @stride_fifos_dst: FIFO address stride for playback
+ * @words_per_fifo: numbers of words per FIFO fetch/fill, 1 means
+ *                  one channel per FIFO, 2 means 2 channels per FIFO..
+ *                  If 'n_fifos_src =  4' and 'words_per_fifo = 2', it
+ *                  means the first two words(channels) fetch from FIFO0
+ *                  and then jump to FIFO1 for next two words, and so on
+ *                  after the last FIFO3 fetched, roll back to FIFO0.
  * @sw_done: Use software done. Needed for PDM (micfil)
  *
  * Some i.MX Audio devices (SAI, micfil) have multiple successive FIFO
@@ -82,6 +92,9 @@ static inline int imx_dma_is_general_purpose(struct dma_chan *chan)
 struct sdma_peripheral_config {
 	int n_fifos_src;
 	int n_fifos_dst;
+	int stride_fifos_src;
+	int stride_fifos_dst;
+	int words_per_fifo;
 	bool sw_done;
 };