Kars de Jong jongk at linux-m68k.org
Thu Mar 18 10:48:21 GMT 2004

On Thu, 2004-03-18 at 10:14, Geert Uytterhoeven wrote:
> On Wed, 17 Mar 2004, Kars de Jong wrote:
> > - drivers/pcmcia/rsrc_mgr.c:
> >   Uses readl() on ioremapped() PCMCIA common memory, but we don't define
> >   readl() unless CONFIG_PCI is defined. I added isa_readl() and
> >   isa_writel() and defined readl() and writel() to use those when
> >   CONFIG_ISA is enabled. Gayle can handle these just fine, I don't know
> >   how to define isa_mtl() for CONFIG_Q40 and CONFIG_GG2 though. Richard?
> That's a bug in rsrc_mgr.c: since PCMCIA is ISA, it should use isa_readl()
> instead of readl().

I don't think so: isa_read{b,w,l}() are for backwards compatibility when
not using an ioremapped() address.

readl{b,w,l}() should be legal on any value returned by ioremap()
according to Documentation/DocBook/deviceiobook.tmpl:

ISA legacy functions

On older kernels (2.2 and earlier) the ISA bus could be read or       
written with these functions and without ioremap being used. This is no
longer true in Linux 2.4. A set of equivalent functions exist for easy
legacy driver porting. The functions available are prefixed with 'isa_'
and are isa_readb, isa_writeb, isa_readw, isa_writew, isa_readl,
isa_writel, isa_memcpy_fromio and isa_memcpy_toio.

These functions should not be used in new drivers, and will eventually
be going away.

Kind regards,


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