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Kernel: Add character device driver for the RPi "mini UART" (UART1)

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While the PL011-based UART0 is currently reserved for the kernel
console, UART1 is free to be exposed to the userspace as `/dev/ttyS0`.
This will be used as the stdout of `run-tests-and-shutdown.sh` when
testing the AArch64 kernel.
This commit is contained in:
Daniel Bertalan 2023-05-15 07:51:46 +02:00 • committed by Andrew Kaster
parent 3beb488887
commit c460b84ebe
4 changed files with 186 additions and 0 deletions
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3
Kernel/Arch/init.cpp
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@ -63,6 +63,7 @@
#elif ARCH(AARCH64)
# include <Kernel/Arch/aarch64/RPi/Framebuffer.h>
# include <Kernel/Arch/aarch64/RPi/Mailbox.h>
# include <Kernel/Arch/aarch64/RPi/MiniUART.h>
#endif
// Defined in the linker script
@ -359,6 +360,8 @@ void init_stage2(void*)
(void)SerialDevice::must_create(1).leak_ref();
(void)SerialDevice::must_create(2).leak_ref();
(void)SerialDevice::must_create(3).leak_ref();
#elif ARCH(AARCH64)
(void)MUST(RPi::MiniUART::create()).leak_ref();
#endif
#if ARCH(X86_64)