[V3,00/16] Add Tegra194 PCIe support

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 [v2]:
* Addressed review comments from Thierry

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 some of PCIe spec r4.0 features
  PCI/PME: Export pcie_pme_disable_msi() & pcie_pme_no_msi() APIs
  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

 .../bindings/pci/designware-pcie.txt          |    5 +
 .../bindings/pci/nvidia,tegra194-pcie.txt     |  187 ++
 Documentation/devicetree/bindings/pci/pci.txt |    5 +
 .../bindings/phy/phy-tegra194-p2u.txt         |   28 +
 .../arm64/boot/dts/nvidia/tegra194-p2888.dtsi |    2 +-
 .../boot/dts/nvidia/tegra194-p2972-0000.dts   |   41 +
 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 +
 .../pci/controller/dwc/pcie-designware-ep.c   |   37 +-
 .../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                        |   14 +-
 drivers/pci/pcie/portdrv.h                    |   16 +-
 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, 2750 insertions(+), 54 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