linux-kernel - [PATCH v11] Add support for PCI in AArch64

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Date:	Thu, 18 Sep 2014 02:31:12 +0100
From:	Liviu Dudau <Liviu.Dudau@....com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>, Arnd Bergmann <arnd@...db.de>,
	Rob Herring <robh+dt@...nel.org>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Russell King <linux@....linux.org.uk>,
	linux-pci <linux-pci@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>
Cc:	Tanmay Inamdar <tinamdar@....com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Sinan Kaya <okaya@...eaurora.org>,
	Jingoo Han <jg1.han@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Suravee Suthikulanit <suravee.suthikulpanit@....com>,
	linux-arch <linux-arch@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Device Tree ML <devicetree@...r.kernel.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH v11] Add support for PCI in AArch64

Hi,

This patch adds support for PCIe to AArch64. It depends on my v11 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 v10:
 - Added Catalin's Acked-by

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.

v10 thread here: https://lkml.org/lkml/2014/9/8/325
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

-- 
2.1.0

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