This series adds support for R-Car Gen4 PCI host controller.

To fully support the controller, the following changes were made:
- Generic mechanism to support PCI child buses is added.
- Private data for PCI host bridge and means to access it are added.

The series also includes a workaround for proper ATU propramming and
optimizations to lessen the performance impact of that workaround.

The series was tested as a part of the pci-passthrough patches[1] and
build-tested standalone with enabled HAS_PCI and HAS_VPCI.

[1] https://github.com/Deedone/xen/tree/pci_passthrough_wip

v1->v2:
* see individual patches

Oleksandr Andrushchenko (4):
  xen/arm: allow PCI host bridge to have private data
  xen/arm: make pci_host_common_probe return the bridge
  xen/arm: add support for PCI child bus
  xen/arm: add support for R-Car Gen4 PCI host controller

Volodymyr Babchuk (3):
  xen/arm: rcar4: add delay after programming ATU
  xen/arm: rcar4: add simple optimization to avoid ATU reprogramming
  xen/arm: rcar4: program ATU to accesses to all functions

 xen/arch/arm/include/asm/pci.h      |  16 +-
 xen/arch/arm/pci/Makefile           |   2 +
 xen/arch/arm/pci/ecam.c             |  17 +-
 xen/arch/arm/pci/pci-access.c       |  37 ++-
 xen/arch/arm/pci/pci-designware.c   | 422 ++++++++++++++++++++++++++++
 xen/arch/arm/pci/pci-designware.h   | 105 +++++++
 xen/arch/arm/pci/pci-host-common.c  | 106 +++++--
 xen/arch/arm/pci/pci-host-generic.c |   2 +-
 xen/arch/arm/pci/pci-host-rcar4.c   | 104 +++++++
 xen/arch/arm/pci/pci-host-zynqmp.c  |   2 +-
 xen/arch/arm/vpci.c                 |  83 ++++--
 11 files changed, 846 insertions(+), 50 deletions(-)
 create mode 100644 xen/arch/arm/pci/pci-designware.c
 create mode 100644 xen/arch/arm/pci/pci-designware.h
 create mode 100644 xen/arch/arm/pci/pci-host-rcar4.c

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2.34.1