linux-kernel - Re: [PATCH 4/4] sh: machvec: remove custom ioport

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Date:   Wed, 13 Sep 2023 16:13:04 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Arnd Bergmann <arnd@...nel.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        linux-sh@...r.kernel.org, Rich Felker <dalias@...c.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] sh: machvec: remove custom ioport_{un,}map()

Hi Arnd,

On Wed, Sep 13, 2023 at 4:08 PM Arnd Bergmann <arnd@...db.de> wrote:
> On Wed, Sep 13, 2023, at 14:32, Geert Uytterhoeven wrote:
> > On Wed, Aug 2, 2023 at 8:49 PM Arnd Bergmann <arnd@...nel.org> wrote:
> >> From: Arnd Bergmann <arnd@...db.de>
> >>
> >> These functions were only used on the microdev
> >> board that is now gone, so remove them to simplify
> >> the ioport handling.
> >>
> >> This could be further simplified to use the generic
> >> I/O port accessors now.
> >>
> >> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> >
> >> --- a/arch/sh/include/asm/io.h
> >> +++ b/arch/sh/include/asm/io.h
> >> @@ -181,7 +181,7 @@ static inline void pfx##out##bwlq##p(type val, unsigned long port)  \
> >>  {                                                                      \
> >>         volatile type *__addr;                                          \
> >>                                                                         \
> >> -       __addr = __ioport_map(port, sizeof(type));                      \
> >> +       __addr = (void __iomem *)sh_io_port_base + port;                \
> >
> > Note that this adds unconditional users of sh_io_port_base, while
> > sh_io_port_base is provided by arch/sh/kernel/ioport.c, which is
> > currently only built if CONFIG_GENERIC_IOMAP=n.
> >
> > This is not a problem yet, as the final part to enable GENERIC_IOMAP
> > on SH never made it upstream.  However, Sato-san's series enables
> > GENERIC_IOMAP for SH_DEVICE_TREE=y builds, leading to a link failure.
>
> Do you have a link to that series? I don't understand why you'd
> want to enable GENERIC_IOMAP on sh, given that its PIO accesses
> are always memory mapped in the end.

"[RESEND RFC PATCH 00/12] DeviceTree support for SH7751 based boards."
https://lore.kernel.org/linux-sh/cover.1693444193.git.ysato@users.sourceforge.jp/

In the meantime, there is a v2, which I wasn't aware of when I wrote
my previous email, so perhaps my comment is no longer valid.
"[RFC PATCH v2 00/30] Device Tree support for SH7751 based board"
https://lore.kernel.org/linux-sh/cover.1694596125.git.ysato@users.sourceforge.jp

> Is this needed for the trapped_io CF stuff?

I don't know.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

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