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/irqchip/arm-gic-acpi.h> 17 18 #include <asm/cputype.h> 19 #include <asm/smp_plat.h> 20 21 /* Basic configuration for ACPI */ 22 #ifdef CONFIG_ACPI 23 /* ACPI table mapping after acpi_gbl_permanent_mmap is set */ 24 static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys, 25 acpi_size size) 26 { 27 if (!page_is_ram(phys >> PAGE_SHIFT)) 28 return ioremap(phys, size); 29 30 return ioremap_cache(phys, size); 31 } 32 #define acpi_os_ioremap acpi_os_ioremap 33 34 typedef u64 phys_cpuid_t; 35 #define PHYS_CPUID_INVALID INVALID_HWID 36 37 #define acpi_strict 1 /* No out-of-spec workarounds on ARM64 */ 38 extern int acpi_disabled; 39 extern int acpi_noirq; 40 extern int acpi_pci_disabled; 41 42 /* 1 to indicate PSCI 0.2+ is implemented */ 43 static inline bool acpi_psci_present(void) 44 { 45 return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_COMPLIANT; 46 } 47 48 /* 1 to indicate HVC must be used instead of SMC as the PSCI conduit */ 49 static inline bool acpi_psci_use_hvc(void) 50 { 51 return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_USE_HVC; 52 } 53 54 static inline void disable_acpi(void) 55 { 56 acpi_disabled = 1; 57 acpi_pci_disabled = 1; 58 acpi_noirq = 1; 59 } 60 61 static inline void enable_acpi(void) 62 { 63 acpi_disabled = 0; 64 acpi_pci_disabled = 0; 65 acpi_noirq = 0; 66 } 67 68 /* 69 * The ACPI processor driver for ACPI core code needs this macro 70 * to find out this cpu was already mapped (mapping from CPU hardware 71 * ID to CPU logical ID) or not. 72 */ 73 #define cpu_physical_id(cpu) cpu_logical_map(cpu) 74 75 /* 76 * It's used from ACPI core in kdump to boot UP system with SMP kernel, 77 * with this check the ACPI core will not override the CPU index 78 * obtained from GICC with 0 and not print some error message as well. 79 * Since MADT must provide at least one GICC structure for GIC 80 * initialization, CPU will be always available in MADT on ARM64. 81 */ 82 static inline bool acpi_has_cpu_in_madt(void) 83 { 84 return true; 85 } 86 87 static inline void arch_fix_phys_package_id(int num, u32 slot) { } 88 void __init acpi_init_cpus(void); 89 90 #else 91 static inline bool acpi_psci_present(void) { return false; } 92 static inline bool acpi_psci_use_hvc(void) { return false; } 93 static inline void acpi_init_cpus(void) { } 94 #endif /* CONFIG_ACPI */ 95 96 #endif /*_ASM_ACPI_H*/ 97