linux-kernel - RE: [PATCH4/4] [POWERPC] Fix cpm

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Date:	Wed, 26 Sep 2007 15:32:29 -0500
From:	"Rune Torgersen" <runet@...ovsys.com>
To:	"Scott Wood" <scottwood@...escale.com>,
	"Dan Malek" <dan@...eddedalley.com>
Cc:	<linuxppc-embedded@...abs.org>, <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH4/4] [POWERPC] Fix cpm_uart driver

> From: Scott Wood
> Maybe that's how it was, but the current code initializes it (more or
> less) directly with IMAP_ADDR, which also gets fed into ioremap.
> 
> One of the two has got to be wrong.

arch/ppc maps the immr area 1:1 into kernel memory, so ioremap and
physical are the same.
See arch/ppc/syslib/m8260_setup.c, line 208 (function m8260_map_io)

Here quoted:
arch/ppc/syslib/m8260_setup.c
196 /* Map the IMMR, plus anything else we can cover
197  * in that upper space according to the memory controller
198  * chip select mapping.  Grab another bunch of space
199  * below that for stuff we can't cover in the upper.
200  */
201 static void __init
202 m8260_map_io(void)
203 {
204         uint addr;
205
206         /* Map IMMR region to a 256MB BAT */
207         addr = (cpm2_immr != NULL) ? (uint)cpm2_immr : CPM_MAP_ADDR;
208         io_block_mapping(addr, addr, 0x10000000, _PAGE_IO);
209
210         /* Map I/O region to a 256MB BAT */
211         io_block_mapping(IO_VIRT_ADDR, IO_PHYS_ADDR, 0x10000000,
_PAGE_IO);
212 }
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