Merge back earlier cpuidle material for v4.1. (cdde51b9) · Commits · e / devices / android_kernel_oneplus_sm7250

arch/arm/include/asm/cpuidle.h

+23 −0

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		#ifndef __ASM_ARM_CPUIDLE_H
		#define __ASM_ARM_CPUIDLE_H

		#include <asm/proc-fns.h>

		#ifdef CONFIG_CPU_IDLE
		extern int arm_cpuidle_simple_enter(struct cpuidle_device *dev,
		struct cpuidle_driver *drv, int index);
		@@ -25,4 +27,25 @@ static inline int arm_cpuidle_simple_enter(struct cpuidle_device *dev,
		*/
		#define ARM_CPUIDLE_WFI_STATE ARM_CPUIDLE_WFI_STATE_PWR(UINT_MAX)

		struct device_node;

		struct cpuidle_ops {
		int (*suspend)(int cpu, unsigned long arg);
		int (init)(struct device_node , int cpu);
		};

		struct of_cpuidle_method {
		const char *method;
		struct cpuidle_ops *ops;
		};

		#define CPUIDLE_METHOD_OF_DECLARE(name, _method, _ops) \
		static const struct of_cpuidle_method __cpuidle_method_of_table_##name \
		__used __section(__cpuidle_method_of_table) \
		= { .method = _method, .ops = _ops }

		extern int arm_cpuidle_suspend(int index);

		extern int arm_cpuidle_init(int cpu);

		#endif

arch/arm/kernel/cpuidle.c

+132 −1

Original line number	Diff line number	Diff line
		@@ -10,8 +10,28 @@
		*/

		#include <linux/cpuidle.h>
		#include <asm/proc-fns.h>
		#include <linux/of.h>
		#include <linux/of_device.h>
		#include <asm/cpuidle.h>

		extern struct of_cpuidle_method __cpuidle_method_of_table[];

		static const struct of_cpuidle_method __cpuidle_method_of_table_sentinel
		__used __section(__cpuidle_method_of_table_end);

		static struct cpuidle_ops cpuidle_ops[NR_CPUS];

		/**
		* arm_cpuidle_simple_enter() - a wrapper to cpu_do_idle()
		* @dev: not used
		* @drv: not used
		* @index: not used
		*
		* A trivial wrapper to allow the cpu_do_idle function to be assigned as a
		* cpuidle callback by matching the function signature.
		*
		* Returns the index passed as parameter
		*/
		int arm_cpuidle_simple_enter(struct cpuidle_device *dev,
		struct cpuidle_driver *drv, int index)
		{
		@@ -19,3 +39,114 @@ int arm_cpuidle_simple_enter(struct cpuidle_device *dev,

		return index;
		}

		/**
		* arm_cpuidle_suspend() - function to enter low power idle states
		* @index: an integer used as an identifier for the low level PM callbacks
		*
		* This function calls the underlying arch specific low level PM code as
		* registered at the init time.
		*
		* Returns -EOPNOTSUPP if no suspend callback is defined, the result of the
		* callback otherwise.
		*/
		int arm_cpuidle_suspend(int index)
		{
		int ret = -EOPNOTSUPP;
		int cpu = smp_processor_id();

		if (cpuidle_ops[cpu].suspend)
		ret = cpuidle_ops[cpu].suspend(cpu, index);

		return ret;
		}

		/**
		* arm_cpuidle_get_ops() - find a registered cpuidle_ops by name
		* @method: the method name
		*
		* Search in the __cpuidle_method_of_table array the cpuidle ops matching the
		* method name.
		*
		* Returns a struct cpuidle_ops pointer, NULL if not found.
		*/
		static struct cpuidle_ops __init arm_cpuidle_get_ops(const char method)
		{
		struct of_cpuidle_method *m = __cpuidle_method_of_table;

		for (; m->method; m++)
		if (!strcmp(m->method, method))
		return m->ops;

		return NULL;
		}

		/**
		* arm_cpuidle_read_ops() - Initialize the cpuidle ops with the device tree
		* @dn: a pointer to a struct device node corresponding to a cpu node
		* @cpu: the cpu identifier
		*
		* Get the method name defined in the 'enable-method' property, retrieve the
		* associated cpuidle_ops and do a struct copy. This copy is needed because all
		* cpuidle_ops are tagged __initdata and will be unloaded after the init
		* process.
		*
		* Return 0 on sucess, -ENOENT if no 'enable-method' is defined, -EOPNOTSUPP if
		* no cpuidle_ops is registered for the 'enable-method'.
		*/
		static int __init arm_cpuidle_read_ops(struct device_node *dn, int cpu)
		{
		const char *enable_method;
		struct cpuidle_ops *ops;

		enable_method = of_get_property(dn, "enable-method", NULL);
		if (!enable_method)
		return -ENOENT;

		ops = arm_cpuidle_get_ops(enable_method);
		if (!ops) {
		pr_warn("%s: unsupported enable-method property: %s\n",
		dn->full_name, enable_method);
		return -EOPNOTSUPP;
		}

		cpuidle_ops[cpu] = ops; / structure copy */

		pr_notice("cpuidle: enable-method property '%s'"
		" found operations\n", enable_method);

		return 0;
		}

		/**
		* arm_cpuidle_init() - Initialize cpuidle_ops for a specific cpu
		* @cpu: the cpu to be initialized
		*
		* Initialize the cpuidle ops with the device for the cpu and then call
		* the cpu's idle initialization callback. This may fail if the underlying HW
		* is not operational.
		*
		* Returns:
		* 0 on success,
		* -ENODEV if it fails to find the cpu node in the device tree,
		* -EOPNOTSUPP if it does not find a registered cpuidle_ops for this cpu,
		* -ENOENT if it fails to find an 'enable-method' property,
		* -ENXIO if the HW reports a failure or a misconfiguration,
		* -ENOMEM if the HW report an memory allocation failure
		*/
		int __init arm_cpuidle_init(int cpu)
		{
		struct device_node *cpu_node = of_cpu_device_node_get(cpu);
		int ret;

		if (!cpu_node)
		return -ENODEV;

		ret = arm_cpuidle_read_ops(cpu_node, cpu);
		if (!ret && cpuidle_ops[cpu].init)
		ret = cpuidle_ops[cpu].init(cpu_node, cpu);

		of_node_put(cpu_node);

		return ret;
		}

arch/arm/mach-davinci/cpuidle.c

+0 −1

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		@@ -17,7 +17,6 @@
		#include <linux/cpuidle.h>
		#include <linux/io.h>
		#include <linux/export.h>
		#include <asm/proc-fns.h>
		#include <asm/cpuidle.h>

		#include <mach/cpuidle.h>

arch/arm/mach-imx/cpuidle-imx6q.c

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		@@ -9,7 +9,6 @@
		#include <linux/cpuidle.h>
		#include <linux/module.h>
		#include <asm/cpuidle.h>
		#include <asm/proc-fns.h>

		#include "common.h"
		#include "cpuidle.h"

arch/arm/mach-imx/cpuidle-imx6sl.c

+0 −1

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		@@ -9,7 +9,6 @@
		#include <linux/cpuidle.h>
		#include <linux/module.h>
		#include <asm/cpuidle.h>
		#include <asm/proc-fns.h>

		#include "common.h"
		#include "cpuidle.h"