PCI: MediaTek: Add host controller support for mt2712 and mt7622

From: Honghui Zhang <[email protected]>

MediaTek's PCIe host controller has two generation HWs, MT2712 and MT7622 using the new generation HW, which has two root ports. They share most probing flow with MT2701/MT7623. But the read/write config space logical is different. The per-port registers must be touched for read/write configuration space.

This patchset abstract the common probing flow, and add support for the new generation controller.

Changes since v3:
- Unify the macro define's names with PCIE_ prefix.
- Use lower/upper_32_bits macro and remove AHB2PCIE_BASEL/AHB2PCIE_BASEH.
- Factor out mtk_pcie_find_port to eliminate duplicate code.
- Use list_for_each_entry instead of list_for_each_entry_safe when search list.
- Simplify the mtk_pcie_hw_rd_cfg flow.
- Split a new patch to rename the parameter and function names.
- Update the subject and changelog to include specific SoC IDs.

Changes since v2:
- Split the Gen2 training change to a separate patch.
- Simplify the config_read/write logical and get rid of mtk_pcie_find_port.
- Using bus->sysdata to simplify the code.
- Rebase to commit 65b83b13204a ("PCI: mediatek: Explicitly request exclusive reset control")[1].
- Fix some misspells.
- Add review tags in commit message.

Changes since v1:
- Fix build warnings in arm arch.
- Using SoC specific compatible instead of generic compatible.
- Add devicetree binding example for mt7622.
- Unified the register define names with PCIE_ prefix.
- Cleanup some un-necessary condition determine when starup port.
- minor code cleanups.

[1] https://patchwork.kernel.org/patch/9852591/

Honghui Zhang (2):
PCI: mediatek: make the parameter and function names more accurate
PCI: mediatek: Add a structure to abstract the controller generations

Ryder Lee (5):
PCI: mediatek: Using readl_poll_timeout to wait Gen2 training
PCI: mediatek: switch to use platform_get_resource_byname()
dt-bindings: PCI: rename and cleanup MediaTek binding text
PCI: mediatek: Add controller support for mt2712 and mt7622
dt-bindings: PCI: add support for mt2712 and mt7622

 .../bindings/pci/mediatek,mt7623-pcie.txt          | 130 -----
 .../devicetree/bindings/pci/mediatek-pcie.txt      | 284 ++++++++++
 drivers/pci/host/Kconfig                           |   5 +-
 drivers/pci/host/pcie-mediatek.c                   | 598 ++++++++++++++++++---
 4 files changed, 820 insertions(+), 197 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/pci/mediatek,mt7623-pcie.txt
 create mode 100644 Documentation/devicetree/bindings/pci/mediatek-pcie.txt

2.6.4