linux-kernel - [RFC PATCH 0/7] Linux on Apple Silicon

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Date:   Wed, 20 Jan 2021 14:27:10 +0100
From:   Mohamed Mediouni <mohamed.mediouni@...amail.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Marc Zyngier <maz@...nel.org>,
        Hector Martin <marcan@...can.st>, linux-kernel@...r.kernel.org,
        Mohamed Mediouni <mohamed.mediouni@...amail.com>
Subject: [RFC PATCH 0/7] Linux on Apple Silicon

This patch series contains the changes for a minimal
Linux on Apple Silicon boot, including SMP.

(sorry for the resubmission, I didn't attach the drivers
to the ones beforehand, and didn't submit it properly)

The changes:

- Support for FIQ interrupts in-kernel

This is required for the timer and IPIs on Apple SoCs.

- WFI hook

Apple processors do not keep register state across WFI.
As such, put a mechanism in cpu_ops to put a custom
sleep function instead.

- use nGnRnE instead of nGnRE on Apple processors

Device-nGnRE writes go to nowhere on Apple processors, as
such use MAIR to change those to Device-nGnRE writes.

- Apple AIC driver

Driver for the Apple AIC interrupt controller.

- Apple CPU start driver

On Apple Macs, RVBAR is locked by the bootloader.
And the hardware doesn't have EL3 to provide PSCI
as an option either. This also implements the workaround
for WFI on the hardware.

What is not present:

- Device tree, will be present in a future version of this
patchset

- More devices.

Thank you,

Mohamed Mediouni (1):
  arm64: mm: use nGnRnE instead of nGnRE on Apple processors

Stan Skowronek (6):
  arm64: kernel: FIQ support
  arm64: kernel: Add a WFI hook.
  irqchip/apple-aic: Add support for Apple AIC
  arm64/Kconfig: Add Apple Silicon SoC platform
  arm64: kernel: Apple CPU start driver
  irqchip/apple-aic: add SMP support to the Apple AIC driver.

 .../devicetree/bindings/arm/cpus.yaml         |   1 +
 .../interrupt-controller/apple,aic.yaml       |  49 +++
 MAINTAINERS                                   |   6 +
 arch/arm64/Kconfig.platforms                  |   7 +
 arch/arm64/include/asm/arch_gicv3.h           |   2 +-
 arch/arm64/include/asm/assembler.h            |   8 +-
 arch/arm64/include/asm/cpu_ops.h              |   2 +
 arch/arm64/include/asm/daifflags.h            |   4 +-
 arch/arm64/include/asm/irq.h                  |   4 +
 arch/arm64/include/asm/irqflags.h             |   6 +-
 arch/arm64/kernel/Makefile                    |   1 +
 arch/arm64/kernel/apple_cpustart.c            | 153 ++++++++
 arch/arm64/kernel/cpu_ops.c                   |   6 +
 arch/arm64/kernel/entry.S                     |  74 +++-
 arch/arm64/kernel/irq.c                       |  14 +
 arch/arm64/kernel/process.c                   |  13 +-
 arch/arm64/mm/proc.S                          |  26 ++
 drivers/irqchip/Kconfig                       |   6 +
 drivers/irqchip/Makefile                      |   1 +
 drivers/irqchip/irq-apple-aic.c               | 364 ++++++++++++++++++
 20 files changed, 728 insertions(+), 19 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml
 create mode 100644 arch/arm64/kernel/apple_cpustart.c
 create mode 100644 drivers/irqchip/irq-apple-aic.c

--
2.29.2