linux-kernel - Re: [V2] dmaengine: fsl-edma: Add eDMA support for QorIQ LS1028A platform

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Date:   Mon, 21 Oct 2019 19:25:32 -0500
From:   Li Yang <leoyang.li@....com>
To:     Peng Ma <peng.ma@....com>, "vkoul@...nel.org" <vkoul@...nel.org>,
        Robin Gong <yibin.gong@....com>
Cc:     "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "k.kozlowski.k@...il.com" <k.kozlowski.k@...il.com>,
        Fabio Estevam <fabio.estevam@....com>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [V2] dmaengine: fsl-edma: Add eDMA support for QorIQ LS1028A platform

On Mon, Oct 21, 2019 at 4:57 PM Leo Li <leoyang.li@....com> wrote:
>
>
>
> > -----Original Message-----
> > From: Peng Ma <peng.ma@....com>
> > Sent: Sunday, October 20, 2019 9:22 PM
> > To: vkoul@...nel.org
> > Cc: dan.j.williams@...el.com; Leo Li <leoyang.li@....com>;
> > k.kozlowski.k@...il.com; Fabio Estevam <fabio.estevam@....com>;
> > dmaengine@...r.kernel.org; linux-kernel@...r.kernel.org; Peng Ma
> > <peng.ma@....com>
> > Subject: [V2] dmaengine: fsl-edma: Add eDMA support for QorIQ LS1028A
> > platform
> >
> > Our platforms(such as LS1021A, LS1012A, LS1043A, LS1046A, LS1028A) with
> > below
>
> You only covered QorIQ SoCs, how about the situation for IMX SoCs?
>
> > 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 V2:
> >       - Explaining what's the "Our platforms"
> >
> >  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..611186b 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 soc_fixup_tuning[] = {
> > +     { .family = "QorIQ LS1028A"},
> > +     { },
> > +};
> > +
> >  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(soc_fixup_tuning))
> > +             ch_off += endian_diff[ch_off % 4];
> > +
>
> This probably is not the best fix now.  There is a new mux_configure32() API added but it doesn't consider endianness.  How about making it properly taken care of endianness?  And use it to set these registers?

You can ignore this comment.  The mux_configure32() seems to deal with
a different register layout(32-bit register per CH).

Considering the register per channel is defined as 8-bit in the
reference manual, the hardware seems to be weird to require
byte-swapping as if the register is 32-bit.  Probably you can rename
soc_fixup_tuning something like mux_byte_swap_quirk.

>
> >       muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux];
> >       slot = EDMAMUX_CHCFG_SOURCE(slot);
> >
> > --
> > 2.9.5
>