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 proper device tree and a GPIO 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. The device tree patch is not included here, as it depends on the GPIO driver which is still work-in-progress. Nevertheless, I feel comfortable submitting "PCI: apple: Add driver for the Apple M1". I expect review feedback will be concentrated on the device tree bindings. These bindings are a mish-mash of what's in the Marc's initial driver, Corellium driver, and Mark's U-Boot downstream. They differ from Maz's bindings by including nodes necessary for hardware bring-up, but are simplified from Corellium's bindings by omitting tunables which are handled by the Asahi Linux bootloader (m1n1). I am new to device tree and expect "dt-bindings: PCI: Add Apple PCI controller" to need changes. This was my first time working with YAML bindings; please be gentle :-) I've collected the patches required to test this branch on this branch: https://github.com/mu-one/linux/commits/pcie This branch is based on linux-next and contains a GPIO (pinctrl) driver, this series, and updates to the M1 (T8103) device tree. The type-A ports and Ethernet should work out-of-the-box on that tree, provided the kernel is booted through m1n1. This is a noticeable improvement 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. Alyssa Rosenzweig (2): dt-bindings: PCI: Add Apple PCI controller PCI: apple: Add driver for the Apple M1 .../devicetree/bindings/pci/apple,pcie.yaml | 153 ++++++ MAINTAINERS | 7 + drivers/pci/controller/Kconfig | 13 + drivers/pci/controller/Makefile | 1 + drivers/pci/controller/pcie-apple.c | 466 ++++++++++++++++++ 5 files changed, 640 insertions(+) create mode 100644 Documentation/devicetree/bindings/pci/apple,pcie.yaml create mode 100644 drivers/pci/controller/pcie-apple.c -- 2.30.2
