[PATCH v9 03/12] PCI: Introduce helper functions to deal with PCI I/O ranges.

On Tue, Aug 12, 2014 at 05:25:16PM +0100, Liviu Dudau wrote:

Some architectures do not have a simple view of the PCI I/O space
and instead use a range of CPU addresses that map to bus addresses.
For some architectures these ranges will be expressed by OF bindings
in a device tree file.

This patch introduces a pci_register_io_range() helper function with
a generic implementation that can be used by such architectures to
keep track of the I/O ranges described by the PCI bindings. If the
PCI_IOBASE macro is not defined that signals lack of support for PCI
and we return an error.

In order to retrieve the CPU address associated with an I/O port, a
new helper function pci_pio_to_address() is introduced. This will
search in the list of ranges registered with pci_register_io_range()
and return the CPU address that corresponds to the given port.

Cc: Grant Likely <redacted>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
---
 drivers/of/address.c       | 95 ++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/of_address.h |  2 +
 2 files changed, 97 insertions(+)

Actually, I think we moved too much code into drivers/of/. Is there
anything OF specific about this code to live here (apart from
OF_BAD_ADDR)? I think driver/pci/ more appropriate?

Otherwise it looks fine to me.

-- 
Catalin