arm64: psci: factor invocation code to drivers
To enable sharing with arm, move the core PSCI framework code to drivers/firmware. This results in a minor gain in lines of code, but this will quickly be amortised by the removal of code currently duplicated in arch/arm. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org> Tested-by: Hanjun Guo <hanjun.guo@linaro.org> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Mark Rutland
Will Deacon
Родитель
bc0195aad0
Коммит
bff60792f9
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@ -20,6 +20,7 @@ config ARM64
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select ARM_GIC_V2M if PCI_MSI
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select ARM_GIC_V3
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select ARM_GIC_V3_ITS if PCI_MSI
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select ARM_PSCI_FW
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select BUILDTIME_EXTABLE_SORT
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select CLONE_BACKWARDS
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select COMMON_CLK
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@ -12,11 +12,11 @@
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#ifndef _ASM_ACPI_H
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#define _ASM_ACPI_H
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#include <linux/mm.h>
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#include <linux/irqchip/arm-gic-acpi.h>
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#include <linux/mm.h>
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#include <linux/psci.h>
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#include <asm/cputype.h>
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#include <asm/psci.h>
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#include <asm/smp_plat.h>
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/* Macros for consistency checks of the GICC subtable of MADT */
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@ -1,28 +0,0 @@
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Copyright (C) 2013 ARM Limited
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*/
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#ifndef __ASM_PSCI_H
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#define __ASM_PSCI_H
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int __init psci_dt_init(void);
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#ifdef CONFIG_ACPI
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int __init psci_acpi_init(void);
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bool __init acpi_psci_present(void);
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bool __init acpi_psci_use_hvc(void);
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#else
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static inline int psci_acpi_init(void) { return 0; }
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static inline bool acpi_psci_present(void) { return false; }
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#endif
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#endif /* __ASM_PSCI_H */
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@ -18,23 +18,17 @@
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/smp.h>
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#include <linux/reboot.h>
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#include <linux/pm.h>
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#include <linux/delay.h>
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#include <linux/psci.h>
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#include <linux/slab.h>
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#include <uapi/linux/psci.h>
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#include <asm/compiler.h>
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#include <asm/cputype.h>
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#include <asm/cpu_ops.h>
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#include <asm/errno.h>
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#include <asm/psci.h>
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#include <asm/smp_plat.h>
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#include <asm/suspend.h>
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#include <asm/system_misc.h>
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#define PSCI_POWER_STATE_TYPE_STANDBY 0
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#define PSCI_POWER_STATE_TYPE_POWER_DOWN 1
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static bool psci_power_state_loses_context(u32 state)
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{
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@ -50,122 +44,8 @@ static bool psci_power_state_is_valid(u32 state)
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return !(state & ~valid_mask);
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}
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/*
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* The CPU any Trusted OS is resident on. The trusted OS may reject CPU_OFF
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* calls to its resident CPU, so we must avoid issuing those. We never migrate
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* a Trusted OS even if it claims to be capable of migration -- doing so will
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* require cooperation with a Trusted OS driver.
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*/
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static int resident_cpu = -1;
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struct psci_operations {
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int (*cpu_suspend)(u32 state, unsigned long entry_point);
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int (*cpu_off)(u32 state);
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int (*cpu_on)(unsigned long cpuid, unsigned long entry_point);
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int (*migrate)(unsigned long cpuid);
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int (*affinity_info)(unsigned long target_affinity,
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unsigned long lowest_affinity_level);
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int (*migrate_info_type)(void);
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};
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static struct psci_operations psci_ops;
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typedef unsigned long (psci_fn)(unsigned long, unsigned long,
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unsigned long, unsigned long);
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asmlinkage psci_fn __invoke_psci_fn_hvc;
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asmlinkage psci_fn __invoke_psci_fn_smc;
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static psci_fn *invoke_psci_fn;
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enum psci_function {
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PSCI_FN_CPU_SUSPEND,
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PSCI_FN_CPU_ON,
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PSCI_FN_CPU_OFF,
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PSCI_FN_MIGRATE,
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PSCI_FN_MAX,
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};
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static DEFINE_PER_CPU_READ_MOSTLY(u32 *, psci_power_state);
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static u32 psci_function_id[PSCI_FN_MAX];
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static int psci_to_linux_errno(int errno)
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{
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switch (errno) {
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case PSCI_RET_SUCCESS:
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return 0;
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case PSCI_RET_NOT_SUPPORTED:
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return -EOPNOTSUPP;
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case PSCI_RET_INVALID_PARAMS:
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return -EINVAL;
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case PSCI_RET_DENIED:
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return -EPERM;
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};
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return -EINVAL;
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}
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static u32 psci_get_version(void)
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{
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return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
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}
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static int psci_cpu_suspend(u32 state, unsigned long entry_point)
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{
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int err;
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u32 fn;
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fn = psci_function_id[PSCI_FN_CPU_SUSPEND];
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err = invoke_psci_fn(fn, state, entry_point, 0);
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return psci_to_linux_errno(err);
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}
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static int psci_cpu_off(u32 state)
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{
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int err;
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u32 fn;
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fn = psci_function_id[PSCI_FN_CPU_OFF];
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err = invoke_psci_fn(fn, state, 0, 0);
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return psci_to_linux_errno(err);
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}
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static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point)
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{
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int err;
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u32 fn;
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fn = psci_function_id[PSCI_FN_CPU_ON];
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err = invoke_psci_fn(fn, cpuid, entry_point, 0);
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return psci_to_linux_errno(err);
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}
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static int psci_migrate(unsigned long cpuid)
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{
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int err;
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u32 fn;
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fn = psci_function_id[PSCI_FN_MIGRATE];
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err = invoke_psci_fn(fn, cpuid, 0, 0);
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return psci_to_linux_errno(err);
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}
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static int psci_affinity_info(unsigned long target_affinity,
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unsigned long lowest_affinity_level)
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{
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return invoke_psci_fn(PSCI_0_2_FN64_AFFINITY_INFO, target_affinity,
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lowest_affinity_level, 0);
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}
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static int psci_migrate_info_type(void)
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{
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return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);
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}
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static unsigned long psci_migrate_info_up_cpu(void)
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{
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return invoke_psci_fn(PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU, 0, 0, 0);
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}
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static int __maybe_unused cpu_psci_cpu_init_idle(unsigned int cpu)
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{
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int i, ret, count = 0;
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@ -230,238 +110,6 @@ free_mem:
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return ret;
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}
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static int get_set_conduit_method(struct device_node *np)
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{
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const char *method;
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pr_info("probing for conduit method from DT.\n");
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if (of_property_read_string(np, "method", &method)) {
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pr_warn("missing \"method\" property\n");
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return -ENXIO;
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}
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if (!strcmp("hvc", method)) {
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invoke_psci_fn = __invoke_psci_fn_hvc;
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} else if (!strcmp("smc", method)) {
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invoke_psci_fn = __invoke_psci_fn_smc;
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} else {
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pr_warn("invalid \"method\" property: %s\n", method);
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return -EINVAL;
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}
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return 0;
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}
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static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd)
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{
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invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
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}
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static void psci_sys_poweroff(void)
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{
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invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
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}
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/*
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* Detect the presence of a resident Trusted OS which may cause CPU_OFF to
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* return DENIED (which would be fatal).
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*/
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static void __init psci_init_migrate(void)
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{
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unsigned long cpuid;
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int type, cpu;
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type = psci_ops.migrate_info_type();
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if (type == PSCI_0_2_TOS_MP) {
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pr_info("Trusted OS migration not required\n");
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return;
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}
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if (type == PSCI_RET_NOT_SUPPORTED) {
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pr_info("MIGRATE_INFO_TYPE not supported.\n");
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return;
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}
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if (type != PSCI_0_2_TOS_UP_MIGRATE &&
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type != PSCI_0_2_TOS_UP_NO_MIGRATE) {
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pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
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return;
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}
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cpuid = psci_migrate_info_up_cpu();
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if (cpuid & ~MPIDR_HWID_BITMASK) {
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pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n",
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cpuid);
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return;
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}
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cpu = get_logical_index(cpuid);
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resident_cpu = cpu >= 0 ? cpu : -1;
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pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid);
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}
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static void __init psci_0_2_set_functions(void)
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{
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pr_info("Using standard PSCI v0.2 function IDs\n");
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psci_function_id[PSCI_FN_CPU_SUSPEND] = PSCI_0_2_FN64_CPU_SUSPEND;
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psci_ops.cpu_suspend = psci_cpu_suspend;
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psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF;
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psci_ops.cpu_off = psci_cpu_off;
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psci_function_id[PSCI_FN_CPU_ON] = PSCI_0_2_FN64_CPU_ON;
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psci_ops.cpu_on = psci_cpu_on;
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psci_function_id[PSCI_FN_MIGRATE] = PSCI_0_2_FN64_MIGRATE;
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psci_ops.migrate = psci_migrate;
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psci_ops.affinity_info = psci_affinity_info;
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psci_ops.migrate_info_type = psci_migrate_info_type;
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arm_pm_restart = psci_sys_reset;
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pm_power_off = psci_sys_poweroff;
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}
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/*
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* Probe function for PSCI firmware versions >= 0.2
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*/
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static int __init psci_probe(void)
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{
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u32 ver = psci_get_version();
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pr_info("PSCIv%d.%d detected in firmware.\n",
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PSCI_VERSION_MAJOR(ver),
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PSCI_VERSION_MINOR(ver));
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if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) {
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pr_err("Conflicting PSCI version detected.\n");
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return -EINVAL;
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}
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psci_0_2_set_functions();
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psci_init_migrate();
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return 0;
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}
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typedef int (*psci_initcall_t)(const struct device_node *);
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/*
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* PSCI init function for PSCI versions >=0.2
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*
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* Probe based on PSCI PSCI_VERSION function
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*/
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static int __init psci_0_2_init(struct device_node *np)
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{
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int err;
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err = get_set_conduit_method(np);
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if (err)
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goto out_put_node;
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/*
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* Starting with v0.2, the PSCI specification introduced a call
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* (PSCI_VERSION) that allows probing the firmware version, so
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* that PSCI function IDs and version specific initialization
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* can be carried out according to the specific version reported
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* by firmware
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*/
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err = psci_probe();
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out_put_node:
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of_node_put(np);
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return err;
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}
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/*
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* PSCI < v0.2 get PSCI Function IDs via DT.
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*/
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static int __init psci_0_1_init(struct device_node *np)
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{
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u32 id;
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int err;
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err = get_set_conduit_method(np);
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if (err)
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goto out_put_node;
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pr_info("Using PSCI v0.1 Function IDs from DT\n");
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if (!of_property_read_u32(np, "cpu_suspend", &id)) {
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psci_function_id[PSCI_FN_CPU_SUSPEND] = id;
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psci_ops.cpu_suspend = psci_cpu_suspend;
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}
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if (!of_property_read_u32(np, "cpu_off", &id)) {
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psci_function_id[PSCI_FN_CPU_OFF] = id;
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psci_ops.cpu_off = psci_cpu_off;
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}
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if (!of_property_read_u32(np, "cpu_on", &id)) {
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psci_function_id[PSCI_FN_CPU_ON] = id;
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psci_ops.cpu_on = psci_cpu_on;
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}
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if (!of_property_read_u32(np, "migrate", &id)) {
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psci_function_id[PSCI_FN_MIGRATE] = id;
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psci_ops.migrate = psci_migrate;
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}
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out_put_node:
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of_node_put(np);
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return err;
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}
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static const struct of_device_id psci_of_match[] __initconst = {
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{ .compatible = "arm,psci", .data = psci_0_1_init},
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{ .compatible = "arm,psci-0.2", .data = psci_0_2_init},
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{},
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};
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int __init psci_dt_init(void)
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{
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struct device_node *np;
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const struct of_device_id *matched_np;
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psci_initcall_t init_fn;
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np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
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if (!np)
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return -ENODEV;
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init_fn = (psci_initcall_t)matched_np->data;
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return init_fn(np);
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}
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#ifdef CONFIG_ACPI
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/*
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* We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
|
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* explicitly clarified in SBBR
|
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*/
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int __init psci_acpi_init(void)
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{
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if (!acpi_psci_present()) {
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pr_info("is not implemented in ACPI.\n");
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return -EOPNOTSUPP;
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}
|
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pr_info("probing for conduit method from ACPI.\n");
|
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|
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if (acpi_psci_use_hvc())
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invoke_psci_fn = __invoke_psci_fn_hvc;
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else
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invoke_psci_fn = __invoke_psci_fn_smc;
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return psci_probe();
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}
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#endif
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#ifdef CONFIG_SMP
|
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|
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static int __init cpu_psci_cpu_init(unsigned int cpu)
|
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|
|
@ -489,11 +137,6 @@ static int cpu_psci_cpu_boot(unsigned int cpu)
|
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}
|
||||
|
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#ifdef CONFIG_HOTPLUG_CPU
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static bool psci_tos_resident_on(int cpu)
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{
|
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return cpu == resident_cpu;
|
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}
|
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|
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static int cpu_psci_cpu_disable(unsigned int cpu)
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{
|
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/* Fail early if we don't have CPU_OFF support */
|
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|
|
|
|||
|
|
@ -46,6 +46,7 @@
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#include <linux/of_platform.h>
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#include <linux/efi.h>
|
||||
#include <linux/personality.h>
|
||||
#include <linux/psci.h>
|
||||
|
||||
#include <asm/acpi.h>
|
||||
#include <asm/fixmap.h>
|
||||
|
|
@ -61,7 +62,6 @@
|
|||
#include <asm/tlbflush.h>
|
||||
#include <asm/traps.h>
|
||||
#include <asm/memblock.h>
|
||||
#include <asm/psci.h>
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||||
#include <asm/efi.h>
|
||||
#include <asm/virt.h>
|
||||
#include <asm/xen/hypervisor.h>
|
||||
|
|
|
|||
|
|
@ -5,6 +5,9 @@
|
|||
|
||||
menu "Firmware Drivers"
|
||||
|
||||
config ARM_PSCI_FW
|
||||
bool
|
||||
|
||||
config EDD
|
||||
tristate "BIOS Enhanced Disk Drive calls determine boot disk"
|
||||
depends on X86
|
||||
|
|
|
|||
|
|
@ -1,6 +1,7 @@
|
|||
#
|
||||
# Makefile for the linux kernel.
|
||||
#
|
||||
obj-$(CONFIG_ARM_PSCI_FW) += psci.o
|
||||
obj-$(CONFIG_DMI) += dmi_scan.o
|
||||
obj-$(CONFIG_DMI_SYSFS) += dmi-sysfs.o
|
||||
obj-$(CONFIG_EDD) += edd.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,369 @@
|
|||
/*
|
||||
* 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.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* Copyright (C) 2015 ARM Limited
|
||||
*/
|
||||
|
||||
#define pr_fmt(fmt) "psci: " fmt
|
||||
|
||||
#include <linux/errno.h>
|
||||
#include <linux/linkage.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/pm.h>
|
||||
#include <linux/printk.h>
|
||||
#include <linux/psci.h>
|
||||
#include <linux/reboot.h>
|
||||
|
||||
#include <uapi/linux/psci.h>
|
||||
|
||||
#include <asm/cputype.h>
|
||||
#include <asm/system_misc.h>
|
||||
#include <asm/smp_plat.h>
|
||||
|
||||
/*
|
||||
* The CPU any Trusted OS is resident on. The trusted OS may reject CPU_OFF
|
||||
* calls to its resident CPU, so we must avoid issuing those. We never migrate
|
||||
* a Trusted OS even if it claims to be capable of migration -- doing so will
|
||||
* require cooperation with a Trusted OS driver.
|
||||
*/
|
||||
static int resident_cpu = -1;
|
||||
|
||||
bool psci_tos_resident_on(int cpu)
|
||||
{
|
||||
return cpu == resident_cpu;
|
||||
}
|
||||
|
||||
struct psci_operations psci_ops;
|
||||
|
||||
typedef unsigned long (psci_fn)(unsigned long, unsigned long,
|
||||
unsigned long, unsigned long);
|
||||
asmlinkage psci_fn __invoke_psci_fn_hvc;
|
||||
asmlinkage psci_fn __invoke_psci_fn_smc;
|
||||
static psci_fn *invoke_psci_fn;
|
||||
|
||||
enum psci_function {
|
||||
PSCI_FN_CPU_SUSPEND,
|
||||
PSCI_FN_CPU_ON,
|
||||
PSCI_FN_CPU_OFF,
|
||||
PSCI_FN_MIGRATE,
|
||||
PSCI_FN_MAX,
|
||||
};
|
||||
|
||||
static u32 psci_function_id[PSCI_FN_MAX];
|
||||
|
||||
static int psci_to_linux_errno(int errno)
|
||||
{
|
||||
switch (errno) {
|
||||
case PSCI_RET_SUCCESS:
|
||||
return 0;
|
||||
case PSCI_RET_NOT_SUPPORTED:
|
||||
return -EOPNOTSUPP;
|
||||
case PSCI_RET_INVALID_PARAMS:
|
||||
return -EINVAL;
|
||||
case PSCI_RET_DENIED:
|
||||
return -EPERM;
|
||||
};
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static u32 psci_get_version(void)
|
||||
{
|
||||
return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
|
||||
}
|
||||
|
||||
static int psci_cpu_suspend(u32 state, unsigned long entry_point)
|
||||
{
|
||||
int err;
|
||||
u32 fn;
|
||||
|
||||
fn = psci_function_id[PSCI_FN_CPU_SUSPEND];
|
||||
err = invoke_psci_fn(fn, state, entry_point, 0);
|
||||
return psci_to_linux_errno(err);
|
||||
}
|
||||
|
||||
static int psci_cpu_off(u32 state)
|
||||
{
|
||||
int err;
|
||||
u32 fn;
|
||||
|
||||
fn = psci_function_id[PSCI_FN_CPU_OFF];
|
||||
err = invoke_psci_fn(fn, state, 0, 0);
|
||||
return psci_to_linux_errno(err);
|
||||
}
|
||||
|
||||
static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point)
|
||||
{
|
||||
int err;
|
||||
u32 fn;
|
||||
|
||||
fn = psci_function_id[PSCI_FN_CPU_ON];
|
||||
err = invoke_psci_fn(fn, cpuid, entry_point, 0);
|
||||
return psci_to_linux_errno(err);
|
||||
}
|
||||
|
||||
static int psci_migrate(unsigned long cpuid)
|
||||
{
|
||||
int err;
|
||||
u32 fn;
|
||||
|
||||
fn = psci_function_id[PSCI_FN_MIGRATE];
|
||||
err = invoke_psci_fn(fn, cpuid, 0, 0);
|
||||
return psci_to_linux_errno(err);
|
||||
}
|
||||
|
||||
static int psci_affinity_info(unsigned long target_affinity,
|
||||
unsigned long lowest_affinity_level)
|
||||
{
|
||||
return invoke_psci_fn(PSCI_0_2_FN64_AFFINITY_INFO, target_affinity,
|
||||
lowest_affinity_level, 0);
|
||||
}
|
||||
|
||||
static int psci_migrate_info_type(void)
|
||||
{
|
||||
return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);
|
||||
}
|
||||
|
||||
static unsigned long psci_migrate_info_up_cpu(void)
|
||||
{
|
||||
return invoke_psci_fn(PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU, 0, 0, 0);
|
||||
}
|
||||
|
||||
static int get_set_conduit_method(struct device_node *np)
|
||||
{
|
||||
const char *method;
|
||||
|
||||
pr_info("probing for conduit method from DT.\n");
|
||||
|
||||
if (of_property_read_string(np, "method", &method)) {
|
||||
pr_warn("missing \"method\" property\n");
|
||||
return -ENXIO;
|
||||
}
|
||||
|
||||
if (!strcmp("hvc", method)) {
|
||||
invoke_psci_fn = __invoke_psci_fn_hvc;
|
||||
} else if (!strcmp("smc", method)) {
|
||||
invoke_psci_fn = __invoke_psci_fn_smc;
|
||||
} else {
|
||||
pr_warn("invalid \"method\" property: %s\n", method);
|
||||
return -EINVAL;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd)
|
||||
{
|
||||
invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
|
||||
}
|
||||
|
||||
static void psci_sys_poweroff(void)
|
||||
{
|
||||
invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
|
||||
}
|
||||
|
||||
/*
|
||||
* Detect the presence of a resident Trusted OS which may cause CPU_OFF to
|
||||
* return DENIED (which would be fatal).
|
||||
*/
|
||||
static void __init psci_init_migrate(void)
|
||||
{
|
||||
unsigned long cpuid;
|
||||
int type, cpu = -1;
|
||||
|
||||
type = psci_ops.migrate_info_type();
|
||||
|
||||
if (type == PSCI_0_2_TOS_MP) {
|
||||
pr_info("Trusted OS migration not required\n");
|
||||
return;
|
||||
}
|
||||
|
||||
if (type == PSCI_RET_NOT_SUPPORTED) {
|
||||
pr_info("MIGRATE_INFO_TYPE not supported.\n");
|
||||
return;
|
||||
}
|
||||
|
||||
if (type != PSCI_0_2_TOS_UP_MIGRATE &&
|
||||
type != PSCI_0_2_TOS_UP_NO_MIGRATE) {
|
||||
pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
|
||||
return;
|
||||
}
|
||||
|
||||
cpuid = psci_migrate_info_up_cpu();
|
||||
if (cpuid & ~MPIDR_HWID_BITMASK) {
|
||||
pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n",
|
||||
cpuid);
|
||||
return;
|
||||
}
|
||||
|
||||
cpu = get_logical_index(cpuid);
|
||||
resident_cpu = cpu >= 0 ? cpu : -1;
|
||||
|
||||
pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid);
|
||||
}
|
||||
|
||||
static void __init psci_0_2_set_functions(void)
|
||||
{
|
||||
pr_info("Using standard PSCI v0.2 function IDs\n");
|
||||
psci_function_id[PSCI_FN_CPU_SUSPEND] = PSCI_0_2_FN64_CPU_SUSPEND;
|
||||
psci_ops.cpu_suspend = psci_cpu_suspend;
|
||||
|
||||
psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF;
|
||||
psci_ops.cpu_off = psci_cpu_off;
|
||||
|
||||
psci_function_id[PSCI_FN_CPU_ON] = PSCI_0_2_FN64_CPU_ON;
|
||||
psci_ops.cpu_on = psci_cpu_on;
|
||||
|
||||
psci_function_id[PSCI_FN_MIGRATE] = PSCI_0_2_FN64_MIGRATE;
|
||||
psci_ops.migrate = psci_migrate;
|
||||
|
||||
psci_ops.affinity_info = psci_affinity_info;
|
||||
|
||||
psci_ops.migrate_info_type = psci_migrate_info_type;
|
||||
|
||||
arm_pm_restart = psci_sys_reset;
|
||||
|
||||
pm_power_off = psci_sys_poweroff;
|
||||
}
|
||||
|
||||
/*
|
||||
* Probe function for PSCI firmware versions >= 0.2
|
||||
*/
|
||||
static int __init psci_probe(void)
|
||||
{
|
||||
u32 ver = psci_get_version();
|
||||
|
||||
pr_info("PSCIv%d.%d detected in firmware.\n",
|
||||
PSCI_VERSION_MAJOR(ver),
|
||||
PSCI_VERSION_MINOR(ver));
|
||||
|
||||
if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) {
|
||||
pr_err("Conflicting PSCI version detected.\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
psci_0_2_set_functions();
|
||||
|
||||
psci_init_migrate();
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
typedef int (*psci_initcall_t)(const struct device_node *);
|
||||
|
||||
/*
|
||||
* PSCI init function for PSCI versions >=0.2
|
||||
*
|
||||
* Probe based on PSCI PSCI_VERSION function
|
||||
*/
|
||||
static int __init psci_0_2_init(struct device_node *np)
|
||||
{
|
||||
int err;
|
||||
|
||||
err = get_set_conduit_method(np);
|
||||
|
||||
if (err)
|
||||
goto out_put_node;
|
||||
/*
|
||||
* Starting with v0.2, the PSCI specification introduced a call
|
||||
* (PSCI_VERSION) that allows probing the firmware version, so
|
||||
* that PSCI function IDs and version specific initialization
|
||||
* can be carried out according to the specific version reported
|
||||
* by firmware
|
||||
*/
|
||||
err = psci_probe();
|
||||
|
||||
out_put_node:
|
||||
of_node_put(np);
|
||||
return err;
|
||||
}
|
||||
|
||||
/*
|
||||
* PSCI < v0.2 get PSCI Function IDs via DT.
|
||||
*/
|
||||
static int __init psci_0_1_init(struct device_node *np)
|
||||
{
|
||||
u32 id;
|
||||
int err;
|
||||
|
||||
err = get_set_conduit_method(np);
|
||||
|
||||
if (err)
|
||||
goto out_put_node;
|
||||
|
||||
pr_info("Using PSCI v0.1 Function IDs from DT\n");
|
||||
|
||||
if (!of_property_read_u32(np, "cpu_suspend", &id)) {
|
||||
psci_function_id[PSCI_FN_CPU_SUSPEND] = id;
|
||||
psci_ops.cpu_suspend = psci_cpu_suspend;
|
||||
}
|
||||
|
||||
if (!of_property_read_u32(np, "cpu_off", &id)) {
|
||||
psci_function_id[PSCI_FN_CPU_OFF] = id;
|
||||
psci_ops.cpu_off = psci_cpu_off;
|
||||
}
|
||||
|
||||
if (!of_property_read_u32(np, "cpu_on", &id)) {
|
||||
psci_function_id[PSCI_FN_CPU_ON] = id;
|
||||
psci_ops.cpu_on = psci_cpu_on;
|
||||
}
|
||||
|
||||
if (!of_property_read_u32(np, "migrate", &id)) {
|
||||
psci_function_id[PSCI_FN_MIGRATE] = id;
|
||||
psci_ops.migrate = psci_migrate;
|
||||
}
|
||||
|
||||
out_put_node:
|
||||
of_node_put(np);
|
||||
return err;
|
||||
}
|
||||
|
||||
static const struct of_device_id psci_of_match[] __initconst = {
|
||||
{ .compatible = "arm,psci", .data = psci_0_1_init},
|
||||
{ .compatible = "arm,psci-0.2", .data = psci_0_2_init},
|
||||
{},
|
||||
};
|
||||
|
||||
int __init psci_dt_init(void)
|
||||
{
|
||||
struct device_node *np;
|
||||
const struct of_device_id *matched_np;
|
||||
psci_initcall_t init_fn;
|
||||
|
||||
np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
|
||||
|
||||
if (!np)
|
||||
return -ENODEV;
|
||||
|
||||
init_fn = (psci_initcall_t)matched_np->data;
|
||||
return init_fn(np);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_ACPI
|
||||
/*
|
||||
* We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
|
||||
* explicitly clarified in SBBR
|
||||
*/
|
||||
int __init psci_acpi_init(void)
|
||||
{
|
||||
if (!acpi_psci_present()) {
|
||||
pr_info("is not implemented in ACPI.\n");
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
|
||||
pr_info("probing for conduit method from ACPI.\n");
|
||||
|
||||
if (acpi_psci_use_hvc())
|
||||
invoke_psci_fn = __invoke_psci_fn_hvc;
|
||||
else
|
||||
invoke_psci_fn = __invoke_psci_fn_smc;
|
||||
|
||||
return psci_probe();
|
||||
}
|
||||
#endif
|
||||
|
|
@ -0,0 +1,52 @@
|
|||
/*
|
||||
* 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.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* Copyright (C) 2015 ARM Limited
|
||||
*/
|
||||
|
||||
#ifndef __LINUX_PSCI_H
|
||||
#define __LINUX_PSCI_H
|
||||
|
||||
#include <linux/init.h>
|
||||
#include <linux/types.h>
|
||||
|
||||
#define PSCI_POWER_STATE_TYPE_STANDBY 0
|
||||
#define PSCI_POWER_STATE_TYPE_POWER_DOWN 1
|
||||
|
||||
bool psci_tos_resident_on(int cpu);
|
||||
|
||||
struct psci_operations {
|
||||
int (*cpu_suspend)(u32 state, unsigned long entry_point);
|
||||
int (*cpu_off)(u32 state);
|
||||
int (*cpu_on)(unsigned long cpuid, unsigned long entry_point);
|
||||
int (*migrate)(unsigned long cpuid);
|
||||
int (*affinity_info)(unsigned long target_affinity,
|
||||
unsigned long lowest_affinity_level);
|
||||
int (*migrate_info_type)(void);
|
||||
};
|
||||
|
||||
extern struct psci_operations psci_ops;
|
||||
|
||||
#if defined(CONFIG_ARM_PSCI_FW)
|
||||
int __init psci_dt_init(void);
|
||||
#else
|
||||
static inline int psci_dt_init(void) { return 0; }
|
||||
#endif
|
||||
|
||||
#if defined(CONFIG_ARM_PSCI_FW) && defined(CONFIG_ACPI)
|
||||
int __init psci_acpi_init(void);
|
||||
bool __init acpi_psci_present(void);
|
||||
bool __init acpi_psci_use_hvc(void);
|
||||
#else
|
||||
static inline int psci_acpi_init(void) { return 0; }
|
||||
static inline bool acpi_psci_present(void) { return false; }
|
||||
#endif
|
||||
|
||||
#endif /* __LINUX_PSCI_H */
|
||||
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