arch/arm64/include/asm/acpi.h

   1 /*
   2  *  Copyright (C) 2013-2014, Linaro Ltd.
   3  *      Author: Al Stone <al.stone@linaro.org>
   4  *      Author: Graeme Gregory <graeme.gregory@linaro.org>
   5  *      Author: Hanjun Guo <hanjun.guo@linaro.org>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation;
  10  */
  11
  12 #ifndef _ASM_ACPI_H
  13 #define _ASM_ACPI_H
  14
  15 #include <linux/mm.h>
  16
  17 /* Basic configuration for ACPI */
  18 #ifdef  CONFIG_ACPI
  19 /* ACPI table mapping after acpi_gbl_permanent_mmap is set */
  20 static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys,
  21                                             acpi_size size)
  22 {
  23         if (!page_is_ram(phys >> PAGE_SHIFT))
  24                 return ioremap(phys, size);
  25
  26         return ioremap_cache(phys, size);
  27 }
  28 #define acpi_os_ioremap acpi_os_ioremap
  29
  30 #define acpi_strict 1   /* No out-of-spec workarounds on ARM64 */
  31 extern int acpi_disabled;
  32 extern int acpi_noirq;
  33 extern int acpi_pci_disabled;
  34
  35 /* 1 to indicate PSCI 0.2+ is implemented */
  36 static inline bool acpi_psci_present(void)
  37 {
  38         return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_COMPLIANT;
  39 }
  40
  41 /* 1 to indicate HVC must be used instead of SMC as the PSCI conduit */
  42 static inline bool acpi_psci_use_hvc(void)
  43 {
  44         return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_USE_HVC;
  45 }
  46
  47 static inline void disable_acpi(void)
  48 {
  49         acpi_disabled = 1;
  50         acpi_pci_disabled = 1;
  51         acpi_noirq = 1;
  52 }
  53
  54 static inline void enable_acpi(void)
  55 {
  56         acpi_disabled = 0;
  57         acpi_pci_disabled = 0;
  58         acpi_noirq = 0;
  59 }
  60
  61 /*
  62  * It's used from ACPI core in kdump to boot UP system with SMP kernel,
  63  * with this check the ACPI core will not override the CPU index
  64  * obtained from GICC with 0 and not print some error message as well.
  65  * Since MADT must provide at least one GICC structure for GIC
  66  * initialization, CPU will be always available in MADT on ARM64.
  67  */
  68 static inline bool acpi_has_cpu_in_madt(void)
  69 {
  70         return true;
  71 }
  72
  73 static inline void arch_fix_phys_package_id(int num, u32 slot) { }
  74 void __init acpi_init_cpus(void);
  75
  76 #else
  77 static inline bool acpi_psci_present(void) { return false; }
  78 static inline bool acpi_psci_use_hvc(void) { return false; }
  79 static inline void acpi_init_cpus(void) { }
  80 #endif /* CONFIG_ACPI */
  81
  82 #endif /*_ASM_ACPI_H*/