On Fri, Jan 09, 2015 at 08:34:39PM -0600, Rob Herring wrote:
> Many PCI controllers' configuration space accesses are memory mapped
> varying only in address calculation and access checks. There are 2 main
> access methods: a decoded address space such as ECAM or a single address
> and data register similar to x86. This implementation can support both
> cases as well as be used in cases that need additional pre or post access
> handling.
> 
> A new pci_ops member map_bus is introduced which can do access checks and
> any necessary setup. It returns the address to use for the configuration
> space access. The access types supported are 32-bit only accesses or
> correct byte, word, or dword sized accesses.
> 
> Signed-off-by: Rob Herring <robh@kernel.org>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Cc: linux-pci@vger.kernel.org
> ---
>  drivers/pci/access.c | 87 ++++++++++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/pci.h  | 11 +++++++
>  2 files changed, 98 insertions(+)

Reviewed-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>