linux-kernel - RE: [v3] dmaengine: fsl-edma: Add eDMA support for QorIQ LS1028A platform

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Date:   Mon, 9 Dec 2019 09:15:50 +0000
From:   Robin Gong <yibin.gong@....com>
To:     Peng Ma <peng.ma@....com>, "vkoul@...nel.org" <vkoul@...nel.org>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        Leo Li <leoyang.li@....com>
CC:     "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [v3] dmaengine: fsl-edma: Add eDMA support for QorIQ LS1028A
 platform

On 2019/12/9 17:03 Peng Ma <peng.ma@....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@....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