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 #include <linux/psci.h>
  17
  18 #include <asm/cputype.h>
  19 #include <asm/smp_plat.h>
  20
  21 /* Macros for consistency checks of the GICC subtable of MADT */
  22 #define ACPI_MADT_GICC_LENGTH   \
  23         (acpi_gbl_FADT.header.revision < 6 ? 76 : 80)
  24
  25 #define BAD_MADT_GICC_ENTRY(entry, end)                                         \
  26         (!(entry) || (unsigned long)(entry) + sizeof(*(entry)) > (end) ||       \
  27          (entry)->header.length != ACPI_MADT_GICC_LENGTH)
  28
  29 /* Basic configuration for ACPI */
  30 #ifdef  CONFIG_ACPI
  31 /* ACPI table mapping after acpi_gbl_permanent_mmap is set */
  32 static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys,
  33                                             acpi_size size)
  34 {
  35         if (!page_is_ram(phys >> PAGE_SHIFT))
  36                 return ioremap(phys, size);
  37
  38         return ioremap_cache(phys, size);
  39 }
  40 #define acpi_os_ioremap acpi_os_ioremap
  41
  42 typedef u64 phys_cpuid_t;
  43 #define PHYS_CPUID_INVALID INVALID_HWID
  44
  45 #define acpi_strict 1   /* No out-of-spec workarounds on ARM64 */
  46 extern int acpi_disabled;
  47 extern int acpi_noirq;
  48 extern int acpi_pci_disabled;
  49
  50 static inline void disable_acpi(void)
  51 {
  52         acpi_disabled = 1;
  53         acpi_pci_disabled = 1;
  54         acpi_noirq = 1;
  55 }
  56
  57 static inline void enable_acpi(void)
  58 {
  59         acpi_disabled = 0;
  60         acpi_pci_disabled = 0;
  61         acpi_noirq = 0;
  62 }
  63
  64 /*
  65  * The ACPI processor driver for ACPI core code needs this macro
  66  * to find out this cpu was already mapped (mapping from CPU hardware
  67  * ID to CPU logical ID) or not.
  68  */
  69 #define cpu_physical_id(cpu) cpu_logical_map(cpu)
  70
  71 /*
  72  * It's used from ACPI core in kdump to boot UP system with SMP kernel,
  73  * with this check the ACPI core will not override the CPU index
  74  * obtained from GICC with 0 and not print some error message as well.
  75  * Since MADT must provide at least one GICC structure for GIC
  76  * initialization, CPU will be always available in MADT on ARM64.
  77  */
  78 static inline bool acpi_has_cpu_in_madt(void)
  79 {
  80         return true;
  81 }
  82
  83 static inline void arch_fix_phys_package_id(int num, u32 slot) { }
  84 void __init acpi_init_cpus(void);
  85
  86 #else
  87 static inline void acpi_init_cpus(void) { }
  88 #endif /* CONFIG_ACPI */
  89
  90 static inline const char *acpi_get_enable_method(int cpu)
  91 {
  92         return acpi_psci_present() ? "psci" : NULL;
  93 }
  94
  95 #ifdef  CONFIG_ACPI_APEI
  96 pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr);
  97 #endif
  98
  99 #endif /*_ASM_ACPI_H*/