Re: [PATCH 2/4] serial: sh-sci: Allow for compressed SCIF address

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Hi Chris,

On Fri, Jul 27, 2018 at 11:09 PM Chris Brandt <chris.brandt@xxxxxxxxxxx> wrote:
> Some devices with SCIx_SH4_SCIF_REGTYPE have no space between registers.
> Use the register area size to determine the spacing between register.
>
> Signed-off-by: Chris Brandt <chris.brandt@xxxxxxxxxxx>
> ---
>  drivers/tty/serial/sh-sci.c | 22 +++++++++++++---------
>  1 file changed, 13 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
> index 6ff6f2bf3b9b..138296ec9a7d 100644
> --- a/drivers/tty/serial/sh-sci.c
> +++ b/drivers/tty/serial/sh-sci.c
> @@ -348,15 +348,15 @@ static const struct sci_port_params sci_port_params[SCIx_NR_REGTYPES] = {
>         [SCIx_SH4_SCIF_REGTYPE] = {
>                 .regs = {
>                         [SCSMR]         = { 0x00, 16 },
> -                       [SCBRR]         = { 0x04,  8 },
> -                       [SCSCR]         = { 0x08, 16 },
> -                       [SCxTDR]        = { 0x0c,  8 },
> -                       [SCxSR]         = { 0x10, 16 },
> -                       [SCxRDR]        = { 0x14,  8 },
> -                       [SCFCR]         = { 0x18, 16 },
> -                       [SCFDR]         = { 0x1c, 16 },
> -                       [SCSPTR]        = { 0x20, 16 },
> -                       [SCLSR]         = { 0x24, 16 },
> +                       [SCBRR]         = { 0x02,  8 },
> +                       [SCSCR]         = { 0x04, 16 },
> +                       [SCxTDR]        = { 0x06,  8 },
> +                       [SCxSR]         = { 0x08, 16 },
> +                       [SCxRDR]        = { 0x0a,  8 },
> +                       [SCFCR]         = { 0x0c, 16 },
> +                       [SCFDR]         = { 0x0e, 16 },
> +                       [SCSPTR]        = { 0x10, 16 },
> +                       [SCLSR]         = { 0x12, 16 },
>                 },
>                 .fifosize = 16,
>                 .overrun_reg = SCLSR,
> @@ -2939,6 +2939,10 @@ static int sci_init_single(struct platform_device *dev,
>                         port->regshift = 1;
>         }
>
> +       if (p->regtype == SCIx_SH4_SCIF_REGTYPE)
> +               if (sci_port->reg_size >= 0x20)
> +                       port->regshift = 1;

I've accidentally discovered this breaks SCIF on SH7751R2D (QEMU), as the
board code doesn't fill in regtype, so it is 0 = SCIx_PROBE_REGTYPE.
The proper (default) regtype of SCIx_SH4_SCIF_REGTYPE is derived by
sci_probe_regmap(). However, that value is never fed back to sci_init_single(),
as plat_sci_port is const. So regshift ends up being wrong.

I made it work by changing the check to:

-       if (p->regtype == SCIx_SH4_SCIF_REGTYPE)
+       if (p->regtype == SCIx_SH4_SCIF_REGTYPE ||
+           (p->regtype == SCIx_PROBE_REGTYPE && port->type == PORT_SCIF))

Perhaps there's a better way?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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