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From: Arnd Bergmann <arnd@arndb.de>
To: linuxppc-embedded@ozlabs.org
Subject: Re: ioremap and outb
Date: Fri, 4 Jan 2008 11:45:20 +0100
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On Friday 04 January 2008, Alessandro Rubini wrote:
> > =A0 =A0 =A0 =A0 =A0addr=3Dioremap(base_addr,size); =A0 =A0 =A0 =A0 =A0/=
/ Remap to Mem mapped
>=20
> Yes.

In newer drivers that are specific to powerpc, it's often easier
to use the of_iomap() function to map a device, so you don't
have to calculate the base address manually from the device tree.

> > =A0 =A0 =A0 =A0 =A0out_8(addr) and in_8(addr);=20
>=20
> It should be right, although __raw_readb() and __raw_writeb() may
> suffice for you.

Actually not. While they may work, the __raw_* functions do not have
a specific meaning in device drivers. Depending on the I/O model, they
may or may not work on a given platform. The {in,out}_{8,{be,le}{16,32,64}}
functions however are defined to operate on local (not PCI) ioremapped
mmio devices, and are usually more efficient than the {read,write}{b,w,l,q}
variant you'd use on PCI devices.

	Arnd <><