linux-kernel - Re: [PATCH 4/4] ARM: convert PCI defines to variables

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Date:	Tue, 28 Jun 2011 21:32:13 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Michal Simek <monstr@...str.eu>,
	Rob Herring <rob.herring@...xeda.com>, nico@...xnic.net
Subject: Re: [PATCH 4/4] ARM: convert PCI defines to variables

On 06/28/2011 06:41 PM, Russell King - ARM Linux wrote:
> On Tue, Jun 28, 2011 at 05:57:39PM -0500, Rob Herring wrote:
>> From: Rob Herring <rob.herring@...xeda.com>
>>
>> Convert PCIBIOS_MIN_IO, PCIBIOS_MIN_MEM, and PCIMEM_BASE to variables to allow
>> multi-platform builds. This also removes the requirement for a platform to
>> have a mach/hardware.h.
> 
> Please don't include PCIMEM_BASE in that - move that into asm/vga.h and
> call it VGA_BASE because that's really what it is.  There's also the
> matter of a definition of a HAS_ symbol...
> 
Okay. I'm still setting vga_base (no point in this case for a define) in
the platforms' pci code as in all cases vga_base is set to PCI memory
space.

I don't follow your comment about HAS_ symbol.

>> diff --git a/arch/arm/include/asm/vga.h b/arch/arm/include/asm/vga.h
>> index 250a4dd..86290df 100644
>> --- a/arch/arm/include/asm/vga.h
>> +++ b/arch/arm/include/asm/vga.h
>> @@ -2,7 +2,7 @@
>>  #define ASMARM_VGA_H
>>  
>>  #include <linux/io.h>
>> -#include <mach/hardware.h>
>> +#include <asm/pci.h>
>>  
>>  #define VGA_MAP_MEM(x,s)	(PCIMEM_BASE + (x))
>>  
> 
> VGA is not dependent on having PCI - there have been ARM platforms which
> have VGA without PCI.
> 
>> diff --git a/arch/arm/mach-pxa/include/mach/hardware.h b/arch/arm/mach-pxa/include/mach/hardware.h
>> index b4ea392..de63ca3 100644
>> --- a/arch/arm/mach-pxa/include/mach/hardware.h
>> +++ b/arch/arm/mach-pxa/include/mach/hardware.h
>> @@ -337,8 +337,6 @@ extern unsigned long get_clock_tick_rate(void);
>>  #endif
>>  
>>  #if defined(CONFIG_MACH_ARMCORE) && defined(CONFIG_PCI)
>> -#define PCIBIOS_MIN_IO		0
>> -#define PCIBIOS_MIN_MEM		0
>>  #define ARCH_HAS_DMA_SET_COHERENT_MASK
>>  #endif
>>  
> 
> This definitely breaks because ARCH_HAS_DMA_SET_COHERENT_MASK needs to
> be picked up by linux/dma-mapping.h.  However, this may already be
> broken as there's no clear path where this reliably happens.

Looks like moving it to mach/memory.h would be the right header. This is
also something to make run-time. Hopefully, the dma mapping work will
address that.

Rob

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