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RISC-V: ACPI: Enable SPCR table for console output on RISC-V

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The ACPI SPCR code has been used to enable console output for ARM64 and
X86. The same code can be reused for RISC-V. Furthermore, SPCR table is
mandated for headless system as outlined in the RISC-V BRS
Specification, chapter 6.

Signed-off-by: Sia Jee Heng <jeeheng.sia@starfivetech.com>
Reviewed-by: Sunil V L <sunilvl@ventanamicro.com>
Link: https://lore.kernel.org/r/20240502073751.102093-2-jeeheng.sia@starfivetech.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Sia Jee Heng 2024-05-02 00:37:51 -07:00 committed by Palmer Dabbelt
parent 1613e604df
commit 38738947db
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2 changed files with 12 additions and 1 deletions
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1
arch/riscv/Kconfig
View File

@ -14,6 +14,7 @@ config RISCV
def_bool y
select ACPI_GENERIC_GSI if ACPI
select ACPI_REDUCED_HARDWARE_ONLY if ACPI
select ACPI_SPCR_TABLE if ACPI
select ARCH_DMA_DEFAULT_COHERENT
select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION
select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2

12
arch/riscv/kernel/acpi.c
View File

@ -17,7 +17,9 @@
#include <linux/efi.h>
#include <linux/io.h>
#include <linux/memblock.h>
#include <linux/of_fdt.h>
#include <linux/pci.h>
#include <linux/serial_core.h>
int acpi_noirq = 1; /* skip ACPI IRQ initialization */
int acpi_disabled = 1;
@ -131,7 +133,7 @@ void __init acpi_boot_table_init(void)
if (param_acpi_off ||
(!param_acpi_on && !param_acpi_force &&
efi.acpi20 == EFI_INVALID_TABLE_ADDR))
return;
goto done;
/*
* ACPI is disabled at this point. Enable it in order to parse
@ -151,6 +153,14 @@ void __init acpi_boot_table_init(void)
if (!param_acpi_force)
disable_acpi();
}
done:
if (acpi_disabled) {
if (earlycon_acpi_spcr_enable)
early_init_dt_scan_chosen_stdout();
} else {
acpi_parse_spcr(earlycon_acpi_spcr_enable, true);
}
}
static int acpi_parse_madt_rintc(union acpi_subtable_headers *header, const unsigned long end)