linux-kernel - Re: [PATCH] m68k/mac: Revisit floppy disc controller base addresses

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Date:   Mon, 8 Jul 2019 09:26:51 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Finn Thain <fthain@...egraphics.com.au>
Cc:     Joshua Thompson <funaho@...ai.org>,
        Laurent Vivier <lvivier@...hat.com>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] m68k/mac: Revisit floppy disc controller base addresses

Hi Finn,

Thanks for your patch!

On Thu, Feb 14, 2019 at 11:22 PM Finn Thain <fthain@...egraphics.com.au> wrote:
> Rename floppy_type macros to make them more consistent with the scsi_type
> macros, which are named after classes of models with similar memory maps.
>
> The documentation for LC-class machines has the IO devices at offsets
> from $50F0 0000. Use these addresses (consistent with mac_scsi resources)
> because they may not be aliased elsewhere in the memory map, e.g. at
> offsets from $5000 0000.

I guess the others do have aliases at 0x50000000? ...

>
> Add comments with controller type information from 'Designing Cards and
> Drivers for the Macintosh Family', relevant Developer Notes and
> http://mess.redump.net/mess/driver_info/mac_technical_notes
>
> Adopt phys_addr_t to avoid type casts.
>
> Cc: Laurent Vivier <lvivier@...hat.com>
> Tested-by: Stan Johnson <userm57@...oo.com>
> Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
> Acked-by: Laurent Vivier <lvivier@...hat.com>

> --- a/arch/m68k/mac/config.c
> +++ b/arch/m68k/mac/config.c

> @@ -973,22 +973,22 @@ int __init mac_platform_init(void)
>          */
>
>         switch (macintosh_config->floppy_type) {
> -       case MAC_FLOPPY_SWIM_ADDR1:
> -               swim_base = (u8 *)(VIA1_BASE + 0x1E000);
> +       case MAC_FLOPPY_QUADRA:
> +               swim_base = 0x5001E000;
>                 break;
> -       case MAC_FLOPPY_SWIM_ADDR2:
> -               swim_base = (u8 *)(VIA1_BASE + 0x16000);
> +       case MAC_FLOPPY_OLD:
> +               swim_base = 0x50016000;

... so that's why you change them from 0x50fxxxxx to 0x500xxxxx?

If that is correct, please mention that in the patch description.

Thanks!

>                 break;
> -       default:
> -               swim_base = NULL;
> +       case MAC_FLOPPY_LC:
> +               swim_base = 0x50F16000;
>                 break;
>         }
>
>         if (swim_base) {
>                 struct resource swim_rsrc = {
>                         .flags = IORESOURCE_MEM,
> -                       .start = (resource_size_t)swim_base,
> -                       .end   = (resource_size_t)swim_base + 0x1FFF,
> +                       .start = swim_base,
> +                       .end   = swim_base + 0x1FFF,
>                 };
>
>                 platform_device_register_simple("swim", -1, &swim_rsrc, 1);

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