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Date: Thu, 7 Jul 2011 11:13:26 +0400
From: Alexey Charkov <alchark@...il.com>
To: Russell King - ARM Linux <linux@....linux.org.uk>
Cc: linux-arm-kernel@...ts.infradead.org,
vt8500-wm8505-linux-kernel@...glegroups.com,
Eric Miao <eric.y.miao@...il.com>,
Uwe Kleine-König
<u.kleine-koenig@...gutronix.de>,
Albin Tonnerre <albin.tonnerre@...e-electrons.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6 v8] ARM: Add basic architecture support for
VIA/WonderMedia 85xx SoC's
2011/7/6 Russell King - ARM Linux <linux@....linux.org.uk>:
> On Sun, Dec 19, 2010 at 08:40:17PM +0300, Alexey Charkov wrote:
>> +static struct map_desc vt8500_io_desc[] __initdata = {
>> + /* SoC MMIO registers, to be filled in later */
>> + [0] = {
>> + .type = MT_DEVICE
>> + },
>> + /* PCI I/O space, numbers tied to those in <mach/io.h> */
>> + [1] = {
>> + .virtual = 0xf0000000,
>> + .pfn = __phys_to_pfn(0xc0000000),
>> + .length = SZ_64K,
>> + .type = MT_DEVICE
>> + },
>> +};
> ...
>> diff --git a/arch/arm/mach-vt8500/include/mach/io.h b/arch/arm/mach-vt8500/include/mach/io.h
>> new file mode 100644
>> index 0000000..8dd55c8
>> --- /dev/null
>> +++ b/arch/arm/mach-vt8500/include/mach/io.h
>> +#ifndef __ASM_ARM_ARCH_IO_H
>> +#define __ASM_ARM_ARCH_IO_H
>> +
>> +#define IO_SPACE_LIMIT 0xffff
>> +
>> +#define __io(a) ((void __iomem *)((a) + 0xf0000000))
>> +#define __mem_pci(a) (a)
>
> Can you explain why you seem to have PCI IO space, yet don't have CONFIG_PCI
> selected? Do you have any drivers which use this space without CONFIG_PCI=y?
We have not yet created support for the PCI bridge (or even verified
its existence on the chip). These numbers are derived bit by bit from
vendor-published kernel sources and rather intended as a reference in
case somebody wishes to try and implement PCI support.
All the peripherals on these chips that I know of are statically
mapped platform devices programmed via MMIO registers. There may be
some boards which have support for external PCI devices, but I haven't
seen them.
Best,
Alexey
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