[PATCH V2 00/16] Add Tegra194 PCIe support

[Vidya Sagar <vidyas@nvidia.com>]

Tegra194 has six PCIe controllers based on Synopsys DesignWare core.
There are two Universal PHY (UPHY) blocks with each supporting 12(HSIO:
Hisg Speed IO) and 8(NVHS: NVIDIA High Speed) lanes respectively.
Controllers:0~4 use UPHY lanes from HSIO brick whereas Controller:5 uses
UPHY lanes from NVHS brick. Lane mapping in HSIO UPHY brick to each PCIe
controller (0~4) is controlled in XBAR module by BPMP-FW. Since PCIe
core has PIPE interface, a glue module called PIPE-to-UPHY (P2U) is used
to connect each UPHY lane (applicable to both HSIO and NVHS UPHY bricks)
to PCIe controller
This patch series
- Adds support for P2U PHY driver
- Adds support for PCIe host controller
- Adds device tree nodes each PCIe controllers
- Enables nodes applicable to p2972-0000 platform
- Adds helper APIs in Designware core driver to get capability regs offset
- Adds defines for new feature registers of PCIe spec revision 4
- Makes changes in DesignWare core driver to get Tegra194 PCIe working

Testing done on P2972-0000 platform
- Able to get PCIe link up with on-board Marvel eSATA controller
- Able to get PCIe link up with NVMe cards connected to M.2 Key-M slot
- Able to do data transfers with both SATA drives and NVMe cards

Note
- Enabling x8 slot on P2972-0000 platform requires pinmux driver for Tegra194.
  It is being worked on currently and hence Controller:5 (i.e. x8 slot) is
  disabled in this patch series. A future patch series would enable this.
- This series is based on top of the following series
  Jisheng's patches to add support to .remove() in Designware sub-system
  https://patchwork.kernel.org/project/linux-pci/list/?series=98559
  My patches made on top of Jisheng's patches to export various symbols
  https://patchwork.kernel.org/project/linux-pci/list/?series=101259

Changes since [v1]:
* Addressed review comments from Bjorn, Thierry, Jonathan, Rob & Kishon
* Added more patches in v2 series

Vidya Sagar (16):
  PCI: Add #defines for PCIe spec r4.0 features
  PCI/PME: Export pcie_pme_disable_msi() API
  PCI: Export pcie_bus_config symbol
  PCI: dwc: Perform dbi regs write lock towards the end
  PCI: dwc: Move config space capability search API
  PCI: dwc: Add ext config space capability search API
  dt-bindings: PCI: designware: Add binding for CDM register check
  PCI: dwc: Add support to enable CDM register check
  Documentation/devicetree: Add PCIe supports-clkreq property
  dt-bindings: PCI: tegra: Add device tree support for T194
  dt-bindings: PHY: P2U: Add Tegra 194 P2U block
  arm64: tegra: Add P2U and PCIe controller nodes to Tegra194 DT
  arm64: tegra: Enable PCIe slots in P2972-0000 board
  phy: tegra: Add PCIe PIPE2UPHY support
  PCI: tegra: Add Tegra194 PCIe support
  arm64: Add Tegra194 PCIe driver to defconfig

 .../devicetree/bindings/pci/designware-pcie.txt    |    4 +
 .../bindings/pci/nvidia,tegra194-pcie.txt          |  181 ++
 Documentation/devicetree/bindings/pci/pci.txt      |    5 +
 .../devicetree/bindings/phy/phy-tegra194-p2u.txt   |   28 +
 arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi     |    2 +-
 arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts |   50 +
 arch/arm64/boot/dts/nvidia/tegra194.dtsi           |  449 +++++
 arch/arm64/configs/defconfig                       |    1 +
 drivers/pci/controller/dwc/Kconfig                 |   11 +
 drivers/pci/controller/dwc/Makefile                |    1 +
 drivers/pci/controller/dwc/pcie-designware-ep.c    |   37 +-
 drivers/pci/controller/dwc/pcie-designware-host.c  |    3 -
 drivers/pci/controller/dwc/pcie-designware.c       |   81 +
 drivers/pci/controller/dwc/pcie-designware.h       |   12 +
 drivers/pci/controller/dwc/pcie-tegra194.c         | 1760 ++++++++++++++++++++
 drivers/pci/pci.c                                  |    1 +
 drivers/pci/pcie/pme.c                             |    6 +
 drivers/pci/pcie/portdrv.h                         |    5 +-
 drivers/phy/tegra/Kconfig                          |    7 +
 drivers/phy/tegra/Makefile                         |    1 +
 drivers/phy/tegra/pcie-p2u-tegra194.c              |  120 ++
 include/uapi/linux/pci_regs.h                      |   22 +-
 22 files changed, 2743 insertions(+), 44 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt
 create mode 100644 Documentation/devicetree/bindings/phy/phy-tegra194-p2u.txt
 create mode 100644 drivers/pci/controller/dwc/pcie-tegra194.c
 create mode 100644 drivers/phy/tegra/pcie-p2u-tegra194.c

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2.7.4