[RFC PATCH 0/9] USB host support for Raspberry Pi 4 board

[Sylwester Nawrocki]

Hi all,

This patch series adds USB host support for Raspberry Pi 4 board. 
It includes the Broadcom STB PCIe driver ported from Linux kernel,
a memory mapping update for the xHCI controller behind the PCIe bridge
for 32-bit and 64-bit system builds and some related fixes and updates
in the usb/xhci and the pci driver core code.

One of the issues I run into with RPI4 was not working accesses to 
64-bit xHCI IO registers with readq/writeq.  I am not entirely sure 
if that limitation comes from the VL805 USB host controller or from the
BCM2711 PCI Express Root Complex, or if it's a matter of some missing 
configuration steps for one of these devices.
In Linux kernel quad word accesses for 64-bit xHCI registers are never
used, the best I could come up with so far is a Kconfig option which 
allows to disable readq/writeq for selected target.  Any suggestions 
on how to better solve this are appreciated.

This patch series is based on v2020.04 tag.

Regards,
Sylwester


Marek Szyprowski (4):
  rpi4: shorten a mapping for the DRAM
  rpi4: add a mapping for the PCIe XHCI controller MMIO registers (ARM
    64bit)
  rpi4: add a mapping for the PCIe XHCI controller MMIO registers (ARM
    32bit)
  config: Enable support for the XHCI controller on RPI4 board

Sylwester Nawrocki (5):
  usb: xhci: Add missing cache flush in the scratchpad array
    initialization
  pci: Move some PCIe register offset definitions to a common header
  usb: xhci: Allow accessing 64-bit registers with DWORD accesses only
  pci: Add some PCI Express capability register offset definitions
  pci: Add driver for Broadcom STB PCIe controller

 arch/arm/mach-bcm283x/Kconfig             |   1 +
 arch/arm/mach-bcm283x/include/mach/base.h |   7 +
 arch/arm/mach-bcm283x/init.c              |  72 ++-
 configs/rpi_4_32b_defconfig               |   9 +
 configs/rpi_4_defconfig                   |  10 +
 configs/rpi_arm64_defconfig               |   9 +-
 drivers/pci/Kconfig                       |   5 +
 drivers/pci/Makefile                      |   1 +
 drivers/pci/pci-rcar-gen3.c               |   8 -
 drivers/pci/pcie_brcmstb.c                | 844 ++++++++++++++++++++++++++++++
 drivers/pci/pcie_intel_fpga.c             |   3 -
 drivers/usb/host/Kconfig                  |   7 +
 drivers/usb/host/xhci-mem.c               |   3 +
 include/pci.h                             |  20 +
 include/usb/xhci.h                        |   4 +-
 15 files changed, 985 insertions(+), 18 deletions(-)
 create mode 100644 drivers/pci/pcie_brcmstb.c

-- 
2.7.4