linux-kernel - Re: [PATCH 09/12] unicore32 machine related files: hardware registers

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Date:	Tue, 22 Feb 2011 15:19:03 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	"Guan Xuetao" <gxt@...c.pku.edu.cn>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	"'Greg KH'" <greg@...ah.com>
Subject: Re: [PATCH 09/12] unicore32 machine related files: hardware registers

On Tuesday 22 February 2011, Guan Xuetao wrote:
> > > diff --git a/arch/unicore32/include/mach/hardware.h b/arch/unicore32/include/mach/hardware.h
> > > index 3fb7236..ebce7de 100644
> > > --- a/arch/unicore32/include/mach/hardware.h
> > > +++ b/arch/unicore32/include/mach/hardware.h
> > > @@ -17,19 +17,14 @@
> > >
> > >  #include "PKUnity.h"
> > >
> > > -#define io_p2v(x)  ((x) - PKUNITY_IOSPACE_BASE)
> > > -#define io_v2p(x)  ((x) + PKUNITY_IOSPACE_BASE)
> > > +#define io_p2v(x)  ((x) - PKUNITY_MMIO_BASE)
> > > +#define io_v2p(x)  ((x) + PKUNITY_MMIO_BASE)
> > >
> I apply the patch as following:
> 
> @@ -22,8 +22,7 @@
>  
>  #ifndef __ASSEMBLY__
>  
> -# define __REG(x)      (*((volatile unsigned long *)io_p2v(x)))
> -# define __PREG(x)     (io_v2p((unsigned long)&(x)))
> +# define __REG(x)      (void __iomem *)io_p2v(x)

The patch looks correct, but if you make the the definition for
PKUNITY_MMIO_BASE contain the cast to (void __iomem *), you no
longer need another cast.

> __REG reserved only for all registers prefix.
> And all using for __REG converted to readl/writel.

Fair enough.

	Arnd
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