This adds a PCIe driver for the internal bus on the Apple M1 (and presumably other Apple system-on-chips). It's based on the work of Marc Zyngier, Mark Kettenis, and Stan Skowronek (Corellium). In conjunction with a pinctrl driver, this enables the USB type-A ports and the Ethernet port. It also paves the way for Wi-Fi and Bluetooth, but that requires further work. For the largest change since v1 of the series-- this now uses Mark Kettenis's device tree bindings for PCIe. This series contains Mark's patches (currently under discussion on the LKML) adding the device tree nodes required for PCIe. I have made minor modifications to Mark's original patches to get everything working under Linux: * In the bindings themselves, I've increased the maximum number of interrupts to accommodate the full set. * In the PCIe node, I've added the full set of interrupts. * I've added the PCIe DART nodes (IOMMUs) and the corresponding iommu-map(-mask) properties already covered in the bindings. * I've tweaked the sizes of the `reg` blocks. Otherwise I got a page fault early on. I've collected the patches required to test on this branch: https://github.com/mu-one/linux/commits/pcie-v2 This branch is based on linux-next and contains a GPIO (pinctrl) driver, a clock gate driver, additional device tree nodes, and this series. The type-A ports and Ethernet should work out-of-the-box on that tree, provided the kernel is booted through m1n1. This improves on Maz's initial PCIe driver, which required U-Boot to function. I've started using Linux on M1 as my workstation for Panfrost development, so this should have 40 hours of testing by this time next week. == Project Blurb == Asahi Linux is an open community project dedicated to developing and maintaining mainline support for Apple Silicon on Linux. Feel free to drop by #asahi and #asahi-dev on OFTC to chat with us, or check our website for more information on the project: == Changes == Changes for v2: - Cherrypicked Mark's device tree bindings and switched to using them. - Split up the PCI driver patch into 3. - Large numbers of minor changes to the driver better match upstream quality standards (using more helper functions, etc.) Alyssa Rosenzweig (3): PCI: apple: Add initial hardware bring-up PCI: apple: Set up reference clocks when probing PCI: apple: Add MSI handling Mark Kettenis (3): dt-bindings: pci: Add DT bindings for apple,pcie arm64: apple: Add pinctrl nodes arm64: apple: Add PCIe node .../devicetree/bindings/pci/apple,pcie.yaml | 166 +++++++ MAINTAINERS | 7 + arch/arm64/boot/dts/apple/t8103.dtsi | 207 ++++++++ drivers/pci/controller/Kconfig | 12 + drivers/pci/controller/Makefile | 1 + drivers/pci/controller/pcie-apple.c | 448 ++++++++++++++++++ 6 files changed, 841 insertions(+) create mode 100644 Documentation/devicetree/bindings/pci/apple,pcie.yaml create mode 100644 drivers/pci/controller/pcie-apple.c -- 2.30.2
