Commit d64f84f6 authored by Lorenzo Pieralisi's avatar Lorenzo Pieralisi Committed by Catalin Marinas

arm64: kernel: introduce cpu_init_idle CPU operation

The CPUidle subsystem on ARM64 machines requires the idle states
implementation back-end to initialize idle states parameter upon
boot. This patch adds a hook in the CPU operations structure that
should be initialized by the CPU operations back-end in order to
provide a function that initializes cpu idle states.

This patch also adds the infrastructure to arm64 kernel required
to export the CPU operations based initialization interface, so
that drivers (ie CPUidle) can use it when they are initialized
at probe time.
Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 714f5992
...@@ -28,6 +28,8 @@ struct device_node; ...@@ -28,6 +28,8 @@ struct device_node;
* enable-method property. * enable-method property.
* @cpu_init: Reads any data necessary for a specific enable-method from the * @cpu_init: Reads any data necessary for a specific enable-method from the
* devicetree, for a given cpu node and proposed logical id. * devicetree, for a given cpu node and proposed logical id.
* @cpu_init_idle: Reads any data necessary to initialize CPU idle states from
* devicetree, for a given cpu node and proposed logical id.
* @cpu_prepare: Early one-time preparation step for a cpu. If there is a * @cpu_prepare: Early one-time preparation step for a cpu. If there is a
* mechanism for doing so, tests whether it is possible to boot * mechanism for doing so, tests whether it is possible to boot
* the given CPU. * the given CPU.
...@@ -47,6 +49,7 @@ struct device_node; ...@@ -47,6 +49,7 @@ struct device_node;
struct cpu_operations { struct cpu_operations {
const char *name; const char *name;
int (*cpu_init)(struct device_node *, unsigned int); int (*cpu_init)(struct device_node *, unsigned int);
int (*cpu_init_idle)(struct device_node *, unsigned int);
int (*cpu_prepare)(unsigned int); int (*cpu_prepare)(unsigned int);
int (*cpu_boot)(unsigned int); int (*cpu_boot)(unsigned int);
void (*cpu_postboot)(void); void (*cpu_postboot)(void);
......
#ifndef __ASM_CPUIDLE_H
#define __ASM_CPUIDLE_H
#ifdef CONFIG_CPU_IDLE
extern int cpu_init_idle(unsigned int cpu);
#else
static inline int cpu_init_idle(unsigned int cpu)
{
return -EOPNOTSUPP;
}
#endif
#endif
...@@ -26,6 +26,7 @@ arm64-obj-$(CONFIG_PERF_EVENTS) += perf_regs.o ...@@ -26,6 +26,7 @@ arm64-obj-$(CONFIG_PERF_EVENTS) += perf_regs.o
arm64-obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o arm64-obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o
arm64-obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o arm64-obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
arm64-obj-$(CONFIG_ARM64_CPU_SUSPEND) += sleep.o suspend.o arm64-obj-$(CONFIG_ARM64_CPU_SUSPEND) += sleep.o suspend.o
arm64-obj-$(CONFIG_CPU_IDLE) += cpuidle.o
arm64-obj-$(CONFIG_JUMP_LABEL) += jump_label.o arm64-obj-$(CONFIG_JUMP_LABEL) += jump_label.o
arm64-obj-$(CONFIG_KGDB) += kgdb.o arm64-obj-$(CONFIG_KGDB) += kgdb.o
arm64-obj-$(CONFIG_EFI) += efi.o efi-stub.o efi-entry.o arm64-obj-$(CONFIG_EFI) += efi.o efi-stub.o efi-entry.o
......
/*
* ARM64 CPU idle arch support
*
* Copyright (C) 2014 ARM Ltd.
* Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
*
* 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.
*/
#include <linux/of.h>
#include <linux/of_device.h>
#include <asm/cpuidle.h>
#include <asm/cpu_ops.h>
int cpu_init_idle(unsigned int cpu)
{
int ret = -EOPNOTSUPP;
struct device_node *cpu_node = of_cpu_device_node_get(cpu);
if (!cpu_node)
return -ENODEV;
if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_init_idle)
ret = cpu_ops[cpu]->cpu_init_idle(cpu_node, cpu);
of_node_put(cpu_node);
return ret;
}
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment