linux-kernel - Re: [PATCH] arch: m32r: include: asm: add ioread*_rep() and iowrite*

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Message-ID: <51CC06C5.2040702@asianux.com>
Date:	Thu, 27 Jun 2013 17:32:53 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Arnd Bergmann <arnd@...db.de>,
	Hirokazu Takata <takata@...ux-m32r.org>,
	linux-m32r@...linux-m32r.org, linux-m32r-ja@...linux-m32r.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH] arch: m32r: include: asm: add ioread*_rep() and iowrite*_rep()

On 06/27/2013 05:28 PM, Geert Uytterhoeven wrote:
> On Thu, Jun 27, 2013 at 10:55 AM, Chen Gang <gang.chen@...anux.com> wrote:
>> > On 06/27/2013 03:07 PM, Geert Uytterhoeven wrote:
>>> >> On Thu, Jun 27, 2013 at 6:37 AM, Chen Gang <gang.chen@...anux.com> wrote:
>>>> >>> --- a/arch/m32r/include/asm/io.h
>>>> >>> +++ b/arch/m32r/include/asm/io.h
>>>> >>> @@ -169,6 +169,20 @@ static inline void _writel(unsigned long l, unsigned long addr)
>>>> >>>  #define iowrite16 writew
>>>> >>>  #define iowrite32 writel
>>>> >>>
>>>> >>> +#define ioread8_rep(p, dst, count) \
>>>> >>> +       insb((unsigned long) (p), (dst), (count))
>>> >>
>>> >> As ioread8() is mapped to readb() (I/O memory space), not inb() (I/O
>>> >> port space),
>>> >> ioread8_rep() should map to readsb() (which m32r doesn't have yet
>>> >> BTW), not insb().
>>> >> For m32r this does matter, as inb() and readb() use different mechanisms
>>> >> internally.
>>> >>
>> >
>> > Reasonable, but excuse me, I am not quite familiar with it, can any
>> > other members (or maintainer) to help implement it ?
>> >
>> > Thanks firstly.
>> >
>> > :-)
>> >
>>> >> It seems include/asm-generic/io.h also has this wrong?
>>> >>
>> >
>> > I think it need improvement, if readsb has been defined, it should use
>> > readsb() instead, or just use insb().
> I think m32r can mostly use asm-generic/io.h.
> I.e. arch/m32r/include/asm/io.h has to #define all the operations it implements
> itself, and defer the rest to asm-generic/io.h.

Really it is, if Arnd's patch for asm-generic/io.h pass checking and is
applied, thanks.


Hello Arnd:

Can you help to send the related patch too, since you have already send
the patch for asm-generic/io.h, which this patch depends on.


Thanks.
-- 
Chen Gang
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