[PATCH v10] Add support for PCI in AArch64

[Liviu Dudau <Liviu.Dudau@arm.com>]

Hi,

This patch adds support for PCIe to AArch64. It depends on my v10 patch
that adds support for creating generic host bridge resources from device
trees. With that in place, I was able to boot a platform that
has PCIe host bridge support and use a PCIe network card.

Changes from v9:
 - Moved the pcibios_add_device() patch that parses the IRQ number from DT into here.
 - Moved the arm64-specific redefine of pgprot_device here from the generic patchset.
 - Readability fix for definition of IO_SPACE_LIMIT

Changes from v8:
  - Added support for generic PCI domains

Changes from v7:
  - Rebased to v3.16-rc3
  - Removed pci_ioremap_io() function as it is provided by my v8 generic
    PCI host bridge patches under a different name.

Changes from v6:
  - Guard the pci_domain_nr() inline implementation with #ifdef CONFIG_PCI as
    to avoid conflict with default empty version present in include/linux/pci.h.
    Thanks to Jingoo Han for catching this.

Changes from v5:
  - Removed pcibios_fixup_bridge_ranges() as the week default version is fine.
  - Removed the ALIGN() call in pcibios_align_resource()
  - Stopped exporting pcibios_align_resource()

Changes from v4:
  - Fixed the pci_domain_nr() implementation for arm64. Now we use
    find_pci_host_bride() to find the host bridge before we retrieve
    the domain number.

Changes from v3:
  - Added Acks accumulated so far ;)
  - Still carrying Catalin's patch for moving the PCI_IO_BASE until it
    lands in linux-next or mainline, in order to ease applying the series

Changes from v2:
  - Implement an arch specific version of pci_register_io_range() and
    pci_address_to_pio().
  - Return 1 from pci_proc_domain().

Changes from v1:
  - Added Catalin's patch for moving the PCI_IO_BASE location and extend
    its size to 16MB
  - Integrated Arnd's version of pci_ioremap_io that uses a bitmap for
    keeping track of assigned IO space and returns an io_offset. At the
    moment the code is added in arch/arm64 but it can be moved in drivers/pci.
  - Added a fix for the generic ioport_map() function when !CONFIG_GENERIC_IOMAP
    as suggested by Arnd.

v9 thread here: https://lkml.org/lkml/2014/8/12/394
v8 thread here: https://lkml.org/lkml/2014/7/1/705
v7 thread here: https://lkml.org/lkml/2014/3/14/320
v6 thread here: https://lkml.org/lkml/2014/3/5/41
v5 thread here: https://lkml.org/lkml/2014/3/4/307
v4 thread here: https://lkml.org/lkml/2014/3/3/298
v3 thread here: https://lkml.org/lkml/2014/2/28/211
v2 thread here: https://lkml.org/lkml/2014/2/27/255
v1 thread here: https://lkml.org/lkml/2014/2/3/389

Best regards,
Liviu


Liviu Dudau (1):
  arm64: Add architectural support for PCIe

 arch/arm64/Kconfig               | 22 ++++++++++++++-
 arch/arm64/include/asm/Kbuild    |  1 +
 arch/arm64/include/asm/io.h      |  3 +-
 arch/arm64/include/asm/pci.h     | 37 +++++++++++++++++++++++++
 arch/arm64/include/asm/pgtable.h |  2 ++
 arch/arm64/kernel/Makefile       |  1 +
 arch/arm64/kernel/pci.c          | 59 ++++++++++++++++++++++++++++++++++++++++
 7 files changed, 123 insertions(+), 2 deletions(-)
 create mode 100644 arch/arm64/include/asm/pci.h
 create mode 100644 arch/arm64/kernel/pci.c

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2.0.4