forked from Minki/linux
01fb4d3c39
OPP bindings (for few properties) allow a platform to choose a
value/range among a set of available options. The options are present as
opp-<prop>-<name>, where the platform needs to supply the <name> string.
The OPP properties which allow such an option are: opp-microvolt and
opp-microamp.
Add support to the OPP-core to parse these bindings, by introducing
dev_pm_opp_{set|put}_prop_name() APIs.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
198 lines
6.4 KiB
C
198 lines
6.4 KiB
C
/*
|
|
* 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/list.h>
|
|
#include <linux/limits.h>
|
|
#include <linux/pm_opp.h>
|
|
#include <linux/rculist.h>
|
|
#include <linux/rcupdate.h>
|
|
|
|
/* Lock to allow exclusive modification to the device and opp lists */
|
|
extern struct mutex dev_opp_list_lock;
|
|
|
|
/*
|
|
* Internal data structure organization with the OPP layer library is as
|
|
* follows:
|
|
* dev_opp_list (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 dev_opp structure while each opp
|
|
* is represented by the opp structure.
|
|
*/
|
|
|
|
/**
|
|
* struct dev_pm_opp - Generic OPP description structure
|
|
* @node: opp list 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.
|
|
* RCU usage: opp list is traversed with RCU locks. node
|
|
* modification is possible realtime, hence the modifications
|
|
* are protected by the dev_opp_list_lock for integrity.
|
|
* IMPORTANT: the opp nodes should be maintained in increasing
|
|
* order.
|
|
* @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
|
|
* @rate: Frequency in hertz
|
|
* @u_volt: Target voltage in microvolts corresponding to this OPP
|
|
* @u_volt_min: Minimum voltage in microvolts corresponding to this OPP
|
|
* @u_volt_max: Maximum voltage in microvolts corresponding to this OPP
|
|
* @u_amp: Maximum current drawn by the device in microamperes
|
|
* @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
|
|
* frequency from any other OPP's frequency.
|
|
* @dev_opp: points back to the device_opp struct this opp belongs to
|
|
* @rcu_head: RCU callback head used for deferred freeing
|
|
* @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;
|
|
|
|
bool available;
|
|
bool dynamic;
|
|
bool turbo;
|
|
bool suspend;
|
|
unsigned long rate;
|
|
|
|
unsigned long u_volt;
|
|
unsigned long u_volt_min;
|
|
unsigned long u_volt_max;
|
|
unsigned long u_amp;
|
|
unsigned long clock_latency_ns;
|
|
|
|
struct device_opp *dev_opp;
|
|
struct rcu_head rcu_head;
|
|
|
|
struct device_node *np;
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
struct dentry *dentry;
|
|
#endif
|
|
};
|
|
|
|
/**
|
|
* struct device_list_opp - devices managed by 'struct device_opp'
|
|
* @node: list node
|
|
* @dev: device to which the struct object belongs
|
|
* @rcu_head: RCU callback head used for deferred freeing
|
|
* @dentry: debugfs dentry pointer (per device)
|
|
*
|
|
* This is an internal data structure maintaining the list of devices that are
|
|
* managed by 'struct device_opp'.
|
|
*/
|
|
struct device_list_opp {
|
|
struct list_head node;
|
|
const struct device *dev;
|
|
struct rcu_head rcu_head;
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
struct dentry *dentry;
|
|
#endif
|
|
};
|
|
|
|
/**
|
|
* struct device_opp - Device opp structure
|
|
* @node: list node - contains the devices with OPPs that
|
|
* have been registered. Nodes once added are not modified in this
|
|
* list.
|
|
* RCU usage: nodes are not modified in the list of device_opp,
|
|
* however addition is possible and is secured by dev_opp_list_lock
|
|
* @srcu_head: notifier head to notify the OPP availability changes.
|
|
* @rcu_head: RCU callback head used for deferred freeing
|
|
* @dev_list: list of devices that share these OPPs
|
|
* @opp_list: list of opps
|
|
* @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.
|
|
* @dentry: debugfs dentry pointer of the real device directory (not links).
|
|
* @dentry_name: Name of the real dentry.
|
|
*
|
|
* 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.
|
|
*
|
|
* Because the opp structures can be used from both rcu and srcu readers, we
|
|
* need to wait for the grace period of both of them before freeing any
|
|
* resources. And so we have used kfree_rcu() from within call_srcu() handlers.
|
|
*/
|
|
struct device_opp {
|
|
struct list_head node;
|
|
|
|
struct srcu_notifier_head srcu_head;
|
|
struct rcu_head rcu_head;
|
|
struct list_head dev_list;
|
|
struct list_head opp_list;
|
|
|
|
struct device_node *np;
|
|
unsigned long clock_latency_ns_max;
|
|
bool shared_opp;
|
|
struct dev_pm_opp *suspend_opp;
|
|
|
|
unsigned int *supported_hw;
|
|
unsigned int supported_hw_count;
|
|
const char *prop_name;
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
struct dentry *dentry;
|
|
char dentry_name[NAME_MAX];
|
|
#endif
|
|
};
|
|
|
|
/* Routines internal to opp core */
|
|
struct device_opp *_find_device_opp(struct device *dev);
|
|
struct device_list_opp *_add_list_dev(const struct device *dev,
|
|
struct device_opp *dev_opp);
|
|
struct device_node *_of_get_opp_desc_node(struct device *dev);
|
|
|
|
#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 device_opp *dev_opp);
|
|
int opp_debug_register(struct device_list_opp *list_dev,
|
|
struct device_opp *dev_opp);
|
|
void opp_debug_unregister(struct device_list_opp *list_dev,
|
|
struct device_opp *dev_opp);
|
|
#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 device_opp *dev_opp)
|
|
{ return 0; }
|
|
static inline int opp_debug_register(struct device_list_opp *list_dev,
|
|
struct device_opp *dev_opp)
|
|
{ return 0; }
|
|
|
|
static inline void opp_debug_unregister(struct device_list_opp *list_dev,
|
|
struct device_opp *dev_opp)
|
|
{ }
|
|
#endif /* DEBUG_FS */
|
|
|
|
#endif /* __DRIVER_OPP_H__ */
|