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irqchip: Add RISC-V incoming MSI controller early driver

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The RISC-V advanced interrupt architecture (AIA) specification
defines a new MSI controller called incoming message signalled
interrupt controller (IMSIC) which manages MSI on per-HART (or
per-CPU) basis. It also supports IPIs as software injected MSIs.
(For more details refer https://github.com/riscv/riscv-aia)

Add an early irqchip driver for RISC-V IMSIC which sets up the
IMSIC state and provide IPIs.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Björn Töpel <bjorn@rivosinc.com>
Reviewed-by: Björn Töpel <bjorn@rivosinc.com>
Link: https://lore.kernel.org/r/20240307140307.646078-3-apatel@ventanamicro.com
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Anup Patel 2024-03-07 19:33:00 +05:30 • committed by Thomas Gleixner
commit 21a8f8a0eb
7 changed files with 1269 additions and 0 deletions
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