[lkml]   [2014]   [Mar]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH v7 3/3] arm64: Add architecture support for PCI
On Wednesday 19 March 2014 12:53:11 Rob Herring wrote:
> I've successfully used the preceeding series on ARM converting the
> Versatile PCI support to use it. The main part of the process was just
> copying this arm64 code to arm which tells me the code is in the wrong
> place. There are still some differences in pcibios_fixup_bus, and it
> is not clear to me whether the arm version should be doing all the
> things the arm64 version does and vice-versa. Certainly that should be
> sorted out. The other issues I see is pci_ioremap_io still has to be
> called by the driver and is not aligned at least for the prototype as
> I pointed out. Seems all these issues could be fixed with a simple

I don't even think we need a CONFIG option: Any architecture that wants
to provide pci_ioremap_io (or whatever we end up calling the new version)
needs to pass the virtual base address to the common code, and the
easiest way to do that is using a macro (e.g. PCI_IO_VIRT_BASE).

What I think we should end up with is a generic implementation like

* architectures with special needs may provide their own version,
* but most should be able to use this one.
unsigned long __weak pci_ioremap_iospace(struct resource *bus, unsigned long cpu)
/* find free space, ioremap the bus address, return the offset */

/* this architecture doesn't have memory mapped I/O space,
so this function should never be called */
return -ENODEV;


 \ /
  Last update: 2014-03-19 20:01    [W:0.084 / U:24.648 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site