forked from Minki/linux
0f0783365c
The code that initializes cpus on arm64 is currently split in two different code paths that carry out DT and ACPI cpus initialization. Most of the code executing SMP initialization is common and should be merged to reduce discrepancies between ACPI and DT initialization and to have code initializing cpus in a single common place in the kernel. This patch refactors arm64 SMP cpus initialization code to merge ACPI and DT boot paths in a common file and to create sanity checks that can be reused by both boot methods. Current code assumes PSCI is the only available boot method when arm64 boots with ACPI; this can be easily extended if/when the ACPI parking protocol is merged into the kernel. Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Hanjun Guo <hanjun.guo@linaro.org> Acked-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Hanjun Guo <hanjun.guo@linaro.org> Tested-by: Mark Rutland <mark.rutland@arm.com> [DT] Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
101 lines
2.7 KiB
C
101 lines
2.7 KiB
C
/*
|
|
* Copyright (C) 2013-2014, Linaro Ltd.
|
|
* Author: Al Stone <al.stone@linaro.org>
|
|
* Author: Graeme Gregory <graeme.gregory@linaro.org>
|
|
* Author: Hanjun Guo <hanjun.guo@linaro.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation;
|
|
*/
|
|
|
|
#ifndef _ASM_ACPI_H
|
|
#define _ASM_ACPI_H
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/irqchip/arm-gic-acpi.h>
|
|
|
|
#include <asm/cputype.h>
|
|
#include <asm/smp_plat.h>
|
|
|
|
/* Basic configuration for ACPI */
|
|
#ifdef CONFIG_ACPI
|
|
/* ACPI table mapping after acpi_gbl_permanent_mmap is set */
|
|
static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys,
|
|
acpi_size size)
|
|
{
|
|
if (!page_is_ram(phys >> PAGE_SHIFT))
|
|
return ioremap(phys, size);
|
|
|
|
return ioremap_cache(phys, size);
|
|
}
|
|
#define acpi_os_ioremap acpi_os_ioremap
|
|
|
|
typedef u64 phys_cpuid_t;
|
|
#define PHYS_CPUID_INVALID INVALID_HWID
|
|
|
|
#define acpi_strict 1 /* No out-of-spec workarounds on ARM64 */
|
|
extern int acpi_disabled;
|
|
extern int acpi_noirq;
|
|
extern int acpi_pci_disabled;
|
|
|
|
/* 1 to indicate PSCI 0.2+ is implemented */
|
|
static inline bool acpi_psci_present(void)
|
|
{
|
|
return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_COMPLIANT;
|
|
}
|
|
|
|
/* 1 to indicate HVC must be used instead of SMC as the PSCI conduit */
|
|
static inline bool acpi_psci_use_hvc(void)
|
|
{
|
|
return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_USE_HVC;
|
|
}
|
|
|
|
static inline void disable_acpi(void)
|
|
{
|
|
acpi_disabled = 1;
|
|
acpi_pci_disabled = 1;
|
|
acpi_noirq = 1;
|
|
}
|
|
|
|
static inline void enable_acpi(void)
|
|
{
|
|
acpi_disabled = 0;
|
|
acpi_pci_disabled = 0;
|
|
acpi_noirq = 0;
|
|
}
|
|
|
|
/*
|
|
* The ACPI processor driver for ACPI core code needs this macro
|
|
* to find out this cpu was already mapped (mapping from CPU hardware
|
|
* ID to CPU logical ID) or not.
|
|
*/
|
|
#define cpu_physical_id(cpu) cpu_logical_map(cpu)
|
|
|
|
/*
|
|
* It's used from ACPI core in kdump to boot UP system with SMP kernel,
|
|
* with this check the ACPI core will not override the CPU index
|
|
* obtained from GICC with 0 and not print some error message as well.
|
|
* Since MADT must provide at least one GICC structure for GIC
|
|
* initialization, CPU will be always available in MADT on ARM64.
|
|
*/
|
|
static inline bool acpi_has_cpu_in_madt(void)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline void arch_fix_phys_package_id(int num, u32 slot) { }
|
|
void __init acpi_init_cpus(void);
|
|
|
|
#else
|
|
static inline bool acpi_psci_present(void) { return false; }
|
|
static inline bool acpi_psci_use_hvc(void) { return false; }
|
|
static inline void acpi_init_cpus(void) { }
|
|
#endif /* CONFIG_ACPI */
|
|
|
|
static inline const char *acpi_get_enable_method(int cpu)
|
|
{
|
|
return acpi_psci_present() ? "psci" : NULL;
|
|
}
|
|
#endif /*_ASM_ACPI_H*/
|