linux-kernel - Re: [PATCH 03/12] m68k/mac: Don't remap SWIM MMIO region

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Date:   Tue, 10 Apr 2018 14:38:21 +1200
From:   Michael Schmitz <schmitzmic@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Finn Thain <fthain@...egraphics.com.au>,
        Laurent Vivier <lvivier@...hat.com>,
        Jens Axboe <axboe@...nel.dk>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/12] m68k/mac: Don't remap SWIM MMIO region

Hi Geert,

I haven't seen that weird behaviour in quite some time - we discussed
changing the arch_initcall to some later priority at that time but I
never got around to trying that. No change to mappings in head.S
either as far as I could see.

Was there any rearrangement of MM init relative to arch init since?

Cheers,

  Michael


On Tue, Apr 10, 2018 at 12:54 AM, Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
> Hi Finn,
>
> On Sun, Apr 1, 2018 at 3:41 AM, Finn Thain <fthain@...egraphics.com.au> wrote:
>> For reasons I don't understand, calling ioremap() then iounmap() on
>> the SWIM MMIO region causes a hang on 68030 (but not on 68040).
>
> Michael Schmitz also notices strange things with ioremap() on '030.
>
>> There's no need to call ioremap() for the SWIM address range, as it lies
>> within the usual IO device region at 0x5000 0000, which is already mapped.
>
> by head.S, right?
>
>> --- a/drivers/block/swim.c
>> +++ b/drivers/block/swim.c
>> @@ -911,7 +911,7 @@ static int swim_probe(struct platform_device *dev)
>>                 goto out;
>>         }
>>
>> -       swim_base = ioremap(res->start, resource_size(res));
>> +       swim_base = (struct swim __iomem *)res->start;
>
> I guess you need a __force to please sparse?
>
> 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
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