linux-kernel - Re: [PATCH v3 1/3] asm-generic/io.h: Implement generic {read,write}s*()

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Message-ID: <20140805091426.GA28220@ravnborg.org>
Date:	Tue, 5 Aug 2014 11:14:26 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Thierry Reding <thierry.reding@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/3] asm-generic/io.h: Implement generic
 {read,write}s*()

> >
> > So xxx_p is for pause (or something like that).
> > This also matches that m68k do some tricks with delay() in the _p variants.
> > Thanks for the explanation.
> 
> m68k's isa_delay() uses the same approach as x86's slow_down_io(),
> but only for Q40/Q60, which has a "real" ISA bus that accepts legacy
> ISA expansion cards (http://www.q40.de/).
Based on the nice description from James I have on my todo list
to cook up a patch to io.h to document this.
Had just not got around to do it yet.

	Sam
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