linux-kernel - Re: [PATCH 15/16] floppy: separate the FDC's base address from its registers

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Date:   Wed, 26 Feb 2020 16:46:40 +0100
From:   Willy Tarreau <w@....eu>
To:     Denis Efremov <efremov@...ux.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 15/16] floppy: separate the FDC's base address from its
 registers

On Wed, Feb 26, 2020 at 06:36:52PM +0300, Denis Efremov wrote:
> > One place in the ARM code used to check if the port was equal to FD_DOR,
> > this was changed to testing the register by applying a mask to the port,
> > as was already done in the sparc code.
> > 
> > The sparc, m68k and parisc code could now be slightly cleaned up to
> > benefit from the macro definitions above instead of the equivalent
> > hard-coded values.
> 
> Just to note for future ref: the mask (7) can be introduced as define
> during future clean up of these magic constants.

I'd rather not add it because if we finish to clean up the internal API,
then we can have fd_outb(value, base, reg) and fd_inb(base, reg) where
reg is one of FD_* and base the base address. In this context we don't
need the mask anymore since the register is placed there verbatim.

I do have another earlier patch which did just that, its just that I
attacked the problem from the wrong side, resulting in too many changes
at once for my taste. But I definitely see how we can finish that job
and make everything almost elegant.

Willy