231 lines
7.3 KiB
C
Executable file
231 lines
7.3 KiB
C
Executable file
/*
|
|
* Generic OPP Interface
|
|
*
|
|
* Copyright (C) 2009-2010 Texas Instruments Incorporated.
|
|
* Nishanth Menon
|
|
* Romit Dasgupta
|
|
* Kevin Hilman
|
|
*
|
|
* 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 __DRIVER_OPP_H__
|
|
#define __DRIVER_OPP_H__
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/kref.h>
|
|
#include <linux/list.h>
|
|
#include <linux/limits.h>
|
|
#include <linux/pm_opp.h>
|
|
#include <linux/notifier.h>
|
|
|
|
struct clk;
|
|
struct regulator;
|
|
|
|
/* Lock to allow exclusive modification to the device and opp lists */
|
|
extern struct mutex opp_table_lock;
|
|
|
|
extern struct list_head opp_tables;
|
|
|
|
/*
|
|
* Internal data structure organization with the OPP layer library is as
|
|
* follows:
|
|
* opp_tables (root)
|
|
* |- device 1 (represents voltage domain 1)
|
|
* | |- opp 1 (availability, freq, voltage)
|
|
* | |- opp 2 ..
|
|
* ... ...
|
|
* | `- opp n ..
|
|
* |- device 2 (represents the next voltage domain)
|
|
* ...
|
|
* `- device m (represents mth voltage domain)
|
|
* device 1, 2.. are represented by opp_table structure while each opp
|
|
* is represented by the opp structure.
|
|
*/
|
|
|
|
/**
|
|
* struct dev_pm_opp - Generic OPP description structure
|
|
* @node: opp table node. The nodes are maintained throughout the lifetime
|
|
* of boot. It is expected only an optimal set of OPPs are
|
|
* added to the library by the SoC framework.
|
|
* IMPORTANT: the opp nodes should be maintained in increasing
|
|
* order.
|
|
* @kref: for reference count of the OPP.
|
|
* @available: true/false - marks if this OPP as available or not
|
|
* @dynamic: not-created from static DT entries.
|
|
* @turbo: true if turbo (boost) OPP
|
|
* @suspend: true if suspend OPP
|
|
* @pstate: Device's power domain's performance state.
|
|
* @rate: Frequency in hertz
|
|
* @supplies: Power supplies voltage/current values
|
|
* @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
|
|
* frequency from any other OPP's frequency.
|
|
* @opp_table: points back to the opp_table struct this opp belongs to
|
|
* @np: OPP's device node.
|
|
* @dentry: debugfs dentry pointer (per opp)
|
|
*
|
|
* This structure stores the OPP information for a given device.
|
|
*/
|
|
struct dev_pm_opp {
|
|
struct list_head node;
|
|
struct kref kref;
|
|
|
|
bool available;
|
|
bool dynamic;
|
|
bool turbo;
|
|
bool suspend;
|
|
unsigned int pstate;
|
|
unsigned long rate;
|
|
|
|
struct dev_pm_opp_supply *supplies;
|
|
|
|
unsigned long clock_latency_ns;
|
|
|
|
struct opp_table *opp_table;
|
|
|
|
struct device_node *np;
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
struct dentry *dentry;
|
|
#endif
|
|
};
|
|
|
|
/**
|
|
* struct opp_device - devices managed by 'struct opp_table'
|
|
* @node: list node
|
|
* @dev: device to which the struct object belongs
|
|
* @dentry: debugfs dentry pointer (per device)
|
|
*
|
|
* This is an internal data structure maintaining the devices that are managed
|
|
* by 'struct opp_table'.
|
|
*/
|
|
struct opp_device {
|
|
struct list_head node;
|
|
const struct device *dev;
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
struct dentry *dentry;
|
|
#endif
|
|
};
|
|
|
|
enum opp_table_access {
|
|
OPP_TABLE_ACCESS_UNKNOWN = 0,
|
|
OPP_TABLE_ACCESS_EXCLUSIVE = 1,
|
|
OPP_TABLE_ACCESS_SHARED = 2,
|
|
};
|
|
|
|
/**
|
|
* struct opp_table - Device opp structure
|
|
* @node: table node - contains the devices with OPPs that
|
|
* have been registered. Nodes once added are not modified in this
|
|
* table.
|
|
* @head: notifier head to notify the OPP availability changes.
|
|
* @dev_list: list of devices that share these OPPs
|
|
* @opp_list: table of opps
|
|
* @kref: for reference count of the table.
|
|
* @lock: mutex protecting the opp_list.
|
|
* @np: struct device_node pointer for opp's DT node.
|
|
* @clock_latency_ns_max: Max clock latency in nanoseconds.
|
|
* @shared_opp: OPP is shared between multiple devices.
|
|
* @suspend_opp: Pointer to OPP to be used during device suspend.
|
|
* @supported_hw: Array of version number to support.
|
|
* @supported_hw_count: Number of elements in supported_hw array.
|
|
* @prop_name: A name to postfix to many DT properties, while parsing them.
|
|
* @clk: Device's clock handle
|
|
* @regulators: Supply regulators
|
|
* @regulator_count: Number of power supply regulators. Its value can be -1
|
|
* (uninitialized), 0 (no opp-microvolt property) or > 0 (has opp-microvolt
|
|
* property).
|
|
* @genpd_performance_state: Device's power domain support performance state.
|
|
* @set_opp: Platform specific set_opp callback
|
|
* @set_opp_data: Data to be passed to set_opp callback
|
|
* @dentry: debugfs dentry pointer of the real device directory (not links).
|
|
* @dentry_name: Name of the real dentry.
|
|
*
|
|
* @voltage_tolerance_v1: In percentage, for v1 bindings only.
|
|
*
|
|
* This is an internal data structure maintaining the link to opps attached to
|
|
* a device. This structure is not meant to be shared to users as it is
|
|
* meant for book keeping and private to OPP library.
|
|
*/
|
|
struct opp_table {
|
|
struct list_head node;
|
|
|
|
struct blocking_notifier_head head;
|
|
struct list_head dev_list;
|
|
struct list_head opp_list;
|
|
struct kref kref;
|
|
struct mutex lock;
|
|
|
|
struct device_node *np;
|
|
unsigned long clock_latency_ns_max;
|
|
|
|
/* For backward compatibility with v1 bindings */
|
|
unsigned int voltage_tolerance_v1;
|
|
|
|
enum opp_table_access shared_opp;
|
|
struct dev_pm_opp *suspend_opp;
|
|
|
|
unsigned int *supported_hw;
|
|
unsigned int supported_hw_count;
|
|
const char *prop_name;
|
|
struct clk *clk;
|
|
struct regulator **regulators;
|
|
int regulator_count;
|
|
bool genpd_performance_state;
|
|
|
|
int (*set_opp)(struct dev_pm_set_opp_data *data);
|
|
struct dev_pm_set_opp_data *set_opp_data;
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
struct dentry *dentry;
|
|
char dentry_name[NAME_MAX];
|
|
#endif
|
|
};
|
|
|
|
/* Routines internal to opp core */
|
|
void dev_pm_opp_get(struct dev_pm_opp *opp);
|
|
void _get_opp_table_kref(struct opp_table *opp_table);
|
|
int _get_opp_count(struct opp_table *opp_table);
|
|
struct opp_table *_find_opp_table(struct device *dev);
|
|
struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table);
|
|
void _dev_pm_opp_remove_table(struct opp_table *opp_table, struct device *dev, bool remove_all);
|
|
void _dev_pm_opp_find_and_remove_table(struct device *dev, bool remove_all);
|
|
struct dev_pm_opp *_opp_allocate(struct opp_table *opp_table);
|
|
void _opp_free(struct dev_pm_opp *opp);
|
|
int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table, bool rate_not_available);
|
|
int _opp_add_v1(struct opp_table *opp_table, struct device *dev, unsigned long freq, long u_volt, bool dynamic);
|
|
void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of);
|
|
struct opp_table *_add_opp_table(struct device *dev);
|
|
|
|
#ifdef CONFIG_OF
|
|
void _of_init_opp_table(struct opp_table *opp_table, struct device *dev);
|
|
#else
|
|
static inline void _of_init_opp_table(struct opp_table *opp_table, struct device *dev) {}
|
|
#endif
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
void opp_debug_remove_one(struct dev_pm_opp *opp);
|
|
int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table);
|
|
int opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table);
|
|
void opp_debug_unregister(struct opp_device *opp_dev, struct opp_table *opp_table);
|
|
#else
|
|
static inline void opp_debug_remove_one(struct dev_pm_opp *opp) {}
|
|
|
|
static inline int opp_debug_create_one(struct dev_pm_opp *opp,
|
|
struct opp_table *opp_table)
|
|
{ return 0; }
|
|
static inline int opp_debug_register(struct opp_device *opp_dev,
|
|
struct opp_table *opp_table)
|
|
{ return 0; }
|
|
|
|
static inline void opp_debug_unregister(struct opp_device *opp_dev,
|
|
struct opp_table *opp_table)
|
|
{ }
|
|
#endif /* DEBUG_FS */
|
|
|
|
#endif /* __DRIVER_OPP_H__ */
|