Re: [PATCH 03/15] SPEAr13xx: Add mach/io.h

[Pratyush Anand <pratyush.anand@st.com>]

On 10/31/2012 3:15 AM, Arnd Bergmann wrote:
> On Monday 29 October 2012, Pratyush Anand wrote:
>> Any transaction between 0x80000000 to 0x8FFFFFFF can only be used for
>> any type(IO/MEM/CFG0/CFG1) of PCIe transaction. Therefore , we need to
>> have this mapping in io.h.
>
> No you don't.
>
> The I/O space window will only be in one place on a given system, so you
> should register that window using pci_ioremap_io() as all the other

Sorry, I could not find pci_ioremap_io function. May be you wanted to 
refer something else.

In case of SPEAr too , we can reserve first 32Kb per controller as PCIe 
IO space. So, lets say I fixed address 0x80000000--0x80007FFF for IO 
transaction. I need to register address range of this window somehow.

But, issue which faced was that I was not able to successfully 
request_resource(&ioport_resource, &res]) with res.start = 0x80000000 
and res.end = 0x80007fff.

So, I though first to change IO_SPACE_LIMIT. But I found it not a 
correct way.

May be I am missing something and not able to get how can I use 
pci_ioremap_io or something else to register 0x80000000--0x80007FFF 
window. A reference will help.


Regards
Pratyush
> modern platforms. There is no excuse for having a per-platform mach/io.h
> any more and that would prevent you from enabling spear in a multiplatform
> configuration.
>
> 	Arnd
> .
>