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b10d79f760
This implements the following policy to decide whether ACPI should be used to boot the system: - acpi=off: ACPI will not be used to boot the system, even if there is no alternative available (e.g., device tree is empty) - acpi=force: only ACPI will be used to boot the system; if that fails, there will be no fallback to alternative methods (such as device tree) - otherwise, ACPI will be used as a fallback if the device tree turns out to lack a platform description; the heuristic to decide this is whether /chosen is the only node present at depth 1 CC: Catalin Marinas <catalin.marinas@arm.com> CC: Will Deacon <will.deacon@arm.com> CC: Rafael J. Wysocki <rjw@rjwysocki.net> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Grant Likely <grant.likely@linaro.org> Tested-by: Timur Tabi <timur@codeaurora.org> Signed-off-by: Al Stone <al.stone@linaro.org> Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org> Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
/*
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* Copyright (C) 2013-2014, Linaro Ltd.
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* Author: Al Stone <al.stone@linaro.org>
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* Author: Graeme Gregory <graeme.gregory@linaro.org>
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* Author: Hanjun Guo <hanjun.guo@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation;
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*/
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#ifndef _ASM_ACPI_H
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#define _ASM_ACPI_H
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#include <linux/mm.h>
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/* Basic configuration for ACPI */
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#ifdef CONFIG_ACPI
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/* ACPI table mapping after acpi_gbl_permanent_mmap is set */
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static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys,
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acpi_size size)
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{
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if (!page_is_ram(phys >> PAGE_SHIFT))
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return ioremap(phys, size);
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return ioremap_cache(phys, size);
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}
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#define acpi_os_ioremap acpi_os_ioremap
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#define acpi_strict 1 /* No out-of-spec workarounds on ARM64 */
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extern int acpi_disabled;
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extern int acpi_noirq;
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extern int acpi_pci_disabled;
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static inline void disable_acpi(void)
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{
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acpi_disabled = 1;
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acpi_pci_disabled = 1;
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acpi_noirq = 1;
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}
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static inline void enable_acpi(void)
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{
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acpi_disabled = 0;
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acpi_pci_disabled = 0;
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acpi_noirq = 0;
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}
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/*
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* It's used from ACPI core in kdump to boot UP system with SMP kernel,
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* with this check the ACPI core will not override the CPU index
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* obtained from GICC with 0 and not print some error message as well.
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* Since MADT must provide at least one GICC structure for GIC
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* initialization, CPU will be always available in MADT on ARM64.
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*/
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static inline bool acpi_has_cpu_in_madt(void)
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{
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return true;
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}
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static inline void arch_fix_phys_package_id(int num, u32 slot) { }
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#endif /* CONFIG_ACPI */
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#endif /*_ASM_ACPI_H*/
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