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SubjectRE: [v3] dmaengine: fsl-edma: Add eDMA support for QorIQ LS1028A platform
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On 2019/12/9 17:03 Peng Ma <peng.ma@nxp.com> wrote:
> Our platforms(such as LS1021A, LS1012A, LS1043A, LS1046A, LS1028A) with
> below registers(CHCFG0 - CHCFG15) of eDMA as follows:
> *-----------------------------------------------------------*
> | Offset | OTHERS | LS1028A |
> |--------------|--------------------|-----------------------|
> | 0x0 | CHCFG0 | CHCFG3 |
> |--------------|--------------------|-----------------------|
> | 0x1 | CHCFG1 | CHCFG2 |
> |--------------|--------------------|-----------------------|
> | 0x2 | CHCFG2 | CHCFG1 |
> |--------------|--------------------|-----------------------|
> | 0x3 | CHCFG3 | CHCFG0 |
> |--------------|--------------------|-----------------------|
> | ... | ...... | ...... |
> |--------------|--------------------|-----------------------|
> | 0xC | CHCFG12 | CHCFG15 |
> |--------------|--------------------|-----------------------|
> | 0xD | CHCFG13 | CHCFG14 |
> |--------------|--------------------|-----------------------|
> | 0xE | CHCFG14 | CHCFG13 |
> |--------------|--------------------|-----------------------|
> | 0xF | CHCFG15 | CHCFG12 |
> *-----------------------------------------------------------*
>
> This patch is to improve edma driver to fit LS1028A platform.
>
> Signed-off-by: Peng Ma <peng.ma@nxp.com>
> ---
> Changed for v3:
> - Rename struct soc_device_attribute
>
> drivers/dma/fsl-edma-common.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/dma/fsl-edma-common.c
> b/drivers/dma/fsl-edma-common.c index b1a7ca9..10234e1 100644
> --- a/drivers/dma/fsl-edma-common.c
> +++ b/drivers/dma/fsl-edma-common.c
> @@ -7,6 +7,7 @@
> #include <linux/module.h>
> #include <linux/slab.h>
> #include <linux/dma-mapping.h>
> +#include <linux/sys_soc.h>
>
> #include "fsl-edma-common.h"
>
> @@ -42,6 +43,11 @@
>
> #define EDMA_TCD 0x1000
>
> +static struct soc_device_attribute mux_byte_swap_quirk[] = {
> + { .family = "QorIQ LS1028A"},
> + { },
> +};
> +
How about add 'mux_swap' into 'struct fsl_edma_drvdata' instead
of involving any soc type into the common fsl-edma-common.c? Then
soc type could be added into chip level driver fsl-edma.c like "fsl,vf610-edma"/
"fsl,imx7ulp-edma".

> static void fsl_edma_enable_request(struct fsl_edma_chan *fsl_chan) {
> struct edma_regs *regs = &fsl_chan->edma->regs; @@ -109,10 +115,16
> @@ 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};
> u32 dmamux_nr = fsl_chan->edma->drvdata->dmamuxs;
>
> 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 &&
> + soc_device_match(mux_byte_swap_quirk))
> + ch_off += endian_diff[ch_off % 4];
> +
> muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux];
> slot = EDMAMUX_CHCFG_SOURCE(slot);
>
> --
> 2.9.5

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