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| author | Shengjiu Wang <shengjiu.wang@nxp.com> | 2022-07-07 11:00:29 +0800 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2022-07-21 18:28:35 +0530 |
| commit | e0c7ea83f006ce8c3264ef8b6508a891d886ad4f (patch) | |
| tree | 8d0edf8188b518cede2a4ef70eb53b5ad2f2d14d /drivers/dma | |
| parent | d0b55afa47694f6f61b40f578ede7bde1648fe48 (diff) | |
| download | lwn-e0c7ea83f006ce8c3264ef8b6508a891d886ad4f.tar.gz lwn-e0c7ea83f006ce8c3264ef8b6508a891d886ad4f.zip | |
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>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/imx-sdma.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index 8a5d4d4a4dff..e302089784ed 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -183,6 +183,8 @@ BIT(DMA_DEV_TO_DEV)) #define SDMA_WATERMARK_LEVEL_N_FIFOS GENMASK(15, 12) +#define SDMA_WATERMARK_LEVEL_OFF_FIFOS GENMASK(19, 16) +#define SDMA_WATERMARK_LEVEL_WORDS_PER_FIFO GENMASK(31, 28) #define SDMA_WATERMARK_LEVEL_SW_DONE BIT(23) #define SDMA_DONE0_CONFIG_DONE_SEL BIT(7) @@ -429,6 +431,9 @@ struct sdma_desc { * @n_fifos_src: number of source device fifos * @n_fifos_dst: number of destination device fifos * @sw_done: software done flag + * @stride_fifos_src: stride for source device FIFOs + * @stride_fifos_dst: stride for destination device FIFOs + * @words_per_fifo: copy number of words one time for one FIFO */ struct sdma_channel { struct virt_dma_chan vc; @@ -456,6 +461,9 @@ struct sdma_channel { bool is_ram_script; unsigned int n_fifos_src; unsigned int n_fifos_dst; + unsigned int stride_fifos_src; + unsigned int stride_fifos_dst; + unsigned int words_per_fifo; bool sw_done; }; @@ -1245,17 +1253,29 @@ static void sdma_set_watermarklevel_for_p2p(struct sdma_channel *sdmac) static void sdma_set_watermarklevel_for_sais(struct sdma_channel *sdmac) { unsigned int n_fifos; + unsigned int stride_fifos; + unsigned int words_per_fifo; if (sdmac->sw_done) sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_SW_DONE; - if (sdmac->direction == DMA_DEV_TO_MEM) + if (sdmac->direction == DMA_DEV_TO_MEM) { n_fifos = sdmac->n_fifos_src; - else + stride_fifos = sdmac->stride_fifos_src; + } else { n_fifos = sdmac->n_fifos_dst; + stride_fifos = sdmac->stride_fifos_dst; + } + + words_per_fifo = sdmac->words_per_fifo; sdmac->watermark_level |= FIELD_PREP(SDMA_WATERMARK_LEVEL_N_FIFOS, n_fifos); + sdmac->watermark_level |= + FIELD_PREP(SDMA_WATERMARK_LEVEL_OFF_FIFOS, stride_fifos); + if (words_per_fifo) + sdmac->watermark_level |= + FIELD_PREP(SDMA_WATERMARK_LEVEL_WORDS_PER_FIFO, (words_per_fifo - 1)); } static int sdma_config_channel(struct dma_chan *chan) @@ -1769,6 +1789,9 @@ static int sdma_config(struct dma_chan *chan, } sdmac->n_fifos_src = sdmacfg->n_fifos_src; sdmac->n_fifos_dst = sdmacfg->n_fifos_dst; + sdmac->stride_fifos_src = sdmacfg->stride_fifos_src; + sdmac->stride_fifos_dst = sdmacfg->stride_fifos_dst; + sdmac->words_per_fifo = sdmacfg->words_per_fifo; sdmac->sw_done = sdmacfg->sw_done; } |