Messages in this thread Patch in this message | | | From | Arnd Bergmann <> | Subject | Re: [PATCH 5/6] ARM: convert PCI defines to variables | Date | Sat, 2 Jul 2011 11:21:46 +0200 |
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Hi Rob,
On Wednesday 29 June 2011 18:46:58 Rob Herring wrote: > From: Rob Herring <rob.herring@calxeda.com> > > Convert PCIBIOS_MIN_IO and PCIBIOS_MIN_MEM to variables to allow > multi-platform builds. This also removes the requirement for a platform to > have a mach/hardware.h.
Good idea.
> @@ -24,6 +23,12 @@ EXPORT_SYMBOL(ioport_unmap); > #endif > > #ifdef CONFIG_PCI > +unsigned long pcibios_min_io; > +EXPORT_SYMBOL(pcibios_min_io); > + > +unsigned long pcibios_min_mem; > +EXPORT_SYMBOL(pcibios_min_mem); > +
How about setting these to sensible defaults that will work on most platforms, so that the majority won't have to set them at all?
Basically, the defaults should clearly be
unsigned long pcibios_min_io = 0x1000; unsigned long pcibios_min_mem = 0x01000000;
This just gets us out of the ISA bus range, so an ISA card behind a bridge can use all cards correctly. Most of the ones that currently set both to zero can probably just use those defaults as well, but some architectures have multiple buses or don't start the memory range at zero, so they might need higher values.
> --- a/arch/arm/mach-versatile/include/mach/hardware.h > +++ b/arch/arm/mach-versatile/include/mach/hardware.h > @@ -30,10 +30,6 @@ > #define VERSATILE_PCI_VIRT_BASE (void __iomem *)0xe8000000ul > #define VERSATILE_PCI_CFG_VIRT_BASE (void __iomem *)0xe9000000ul > > -/* CIK guesswork */ > -#define PCIBIOS_MIN_IO 0x44000000 > -#define PCIBIOS_MIN_MEM 0x50000000 > - > /* macro to get at IO space when running virtually */ > #define IO_ADDRESS(x) (((x) & 0x0fffffff) + (((x) >> 4) & 0x0f000000) + 0xf0000000) >
This PCIBIOS_MIN_IO setting is wrong, and PIO doesn't work on versatile because of this. I have an older patch series that I should dig out again to fix them and make versatile use the defaults. Don't worry about this one.
Arnd
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