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/irqchip/arm-gic-acpi.h> 16 #include <linux/mm.h> 17 #include <linux/psci.h> 18 19 #include <asm/cputype.h> 20 #include <asm/smp_plat.h> 21 22 /* Macros for consistency checks of the GICC subtable of MADT */ 23 #define ACPI_MADT_GICC_LENGTH \ 24 (acpi_gbl_FADT.header.revision < 6 ? 76 : 80) 25 26 #define BAD_MADT_GICC_ENTRY(entry, end) \ 27 (!(entry) || (unsigned long)(entry) + sizeof(*(entry)) > (end) || \ 28 (entry)->header.length != ACPI_MADT_GICC_LENGTH) 29 30 /* Basic configuration for ACPI */ 31 #ifdef CONFIG_ACPI 32 /* ACPI table mapping after acpi_gbl_permanent_mmap is set */ 33 static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys, 34 acpi_size size) 35 { 36 if (!page_is_ram(phys >> PAGE_SHIFT)) 37 return ioremap(phys, size); 38 39 return ioremap_cache(phys, size); 40 } 41 #define acpi_os_ioremap acpi_os_ioremap 42 43 typedef u64 phys_cpuid_t; 44 #define PHYS_CPUID_INVALID INVALID_HWID 45 46 #define acpi_strict 1 /* No out-of-spec workarounds on ARM64 */ 47 extern int acpi_disabled; 48 extern int acpi_noirq; 49 extern int acpi_pci_disabled; 50 51 static inline void disable_acpi(void) 52 { 53 acpi_disabled = 1; 54 acpi_pci_disabled = 1; 55 acpi_noirq = 1; 56 } 57 58 static inline void enable_acpi(void) 59 { 60 acpi_disabled = 0; 61 acpi_pci_disabled = 0; 62 acpi_noirq = 0; 63 } 64 65 /* 66 * The ACPI processor driver for ACPI core code needs this macro 67 * to find out this cpu was already mapped (mapping from CPU hardware 68 * ID to CPU logical ID) or not. 69 */ 70 #define cpu_physical_id(cpu) cpu_logical_map(cpu) 71 72 /* 73 * It's used from ACPI core in kdump to boot UP system with SMP kernel, 74 * with this check the ACPI core will not override the CPU index 75 * obtained from GICC with 0 and not print some error message as well. 76 * Since MADT must provide at least one GICC structure for GIC 77 * initialization, CPU will be always available in MADT on ARM64. 78 */ 79 static inline bool acpi_has_cpu_in_madt(void) 80 { 81 return true; 82 } 83 84 static inline void arch_fix_phys_package_id(int num, u32 slot) { } 85 void __init acpi_init_cpus(void); 86 87 #else 88 static inline void acpi_init_cpus(void) { } 89 #endif /* CONFIG_ACPI */ 90 91 static inline const char *acpi_get_enable_method(int cpu) 92 { 93 return acpi_psci_present() ? "psci" : NULL; 94 } 95 #endif /*_ASM_ACPI_H*/ 96