25cb20a212
On some SoCs the Adaptive Voltage Scaling (AVS) technique is employed to optimize the operating voltage of a device. At a given frequency, the hardware monitors dynamic factors and either makes a suggestion for how much to adjust a voltage for the current frequency, or it automatically adjusts the voltage without software intervention. Add an API to the OPP library for the former case, so that AVS type devices can update the voltages for an OPP when the hardware determines the voltage should change. The assumption is that drivers like CPUfreq or devfreq will register for the OPP notifiers and adjust the voltage according to suggestions that AVS makes. This patch is derived from [1] submitted by Stephen. [1] https://lore.kernel.org/patchwork/patch/599279/ Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> [Roger Lu: Changed to rcu less implementation] Signed-off-by: Roger Lu <roger.lu@mediatek.com> [s.nawrocki@samsung.com: added handling of OPP min/max voltage] Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
414 lines
12 KiB
C
414 lines
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Generic OPP Interface
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*
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* Copyright (C) 2009-2010 Texas Instruments Incorporated.
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* Nishanth Menon
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* Romit Dasgupta
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* Kevin Hilman
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*/
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#ifndef __LINUX_OPP_H__
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#define __LINUX_OPP_H__
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#include <linux/err.h>
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#include <linux/notifier.h>
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struct clk;
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struct regulator;
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struct dev_pm_opp;
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struct device;
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struct opp_table;
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enum dev_pm_opp_event {
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OPP_EVENT_ADD, OPP_EVENT_REMOVE, OPP_EVENT_ENABLE, OPP_EVENT_DISABLE,
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OPP_EVENT_ADJUST_VOLTAGE,
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};
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/**
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* struct dev_pm_opp_supply - Power supply voltage/current values
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* @u_volt: Target voltage in microvolts corresponding to this OPP
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* @u_volt_min: Minimum voltage in microvolts corresponding to this OPP
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* @u_volt_max: Maximum voltage in microvolts corresponding to this OPP
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* @u_amp: Maximum current drawn by the device in microamperes
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*
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* This structure stores the voltage/current values for a single power supply.
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*/
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struct dev_pm_opp_supply {
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unsigned long u_volt;
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unsigned long u_volt_min;
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unsigned long u_volt_max;
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unsigned long u_amp;
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};
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/**
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* struct dev_pm_opp_info - OPP freq/voltage/current values
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* @rate: Target clk rate in hz
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* @supplies: Array of voltage/current values for all power supplies
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*
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* This structure stores the freq/voltage/current values for a single OPP.
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*/
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struct dev_pm_opp_info {
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unsigned long rate;
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struct dev_pm_opp_supply *supplies;
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};
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/**
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* struct dev_pm_set_opp_data - Set OPP data
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* @old_opp: Old OPP info
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* @new_opp: New OPP info
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* @regulators: Array of regulator pointers
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* @regulator_count: Number of regulators
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* @clk: Pointer to clk
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* @dev: Pointer to the struct device
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*
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* This structure contains all information required for setting an OPP.
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*/
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struct dev_pm_set_opp_data {
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struct dev_pm_opp_info old_opp;
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struct dev_pm_opp_info new_opp;
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struct regulator **regulators;
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unsigned int regulator_count;
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struct clk *clk;
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struct device *dev;
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};
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#if defined(CONFIG_PM_OPP)
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struct opp_table *dev_pm_opp_get_opp_table(struct device *dev);
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struct opp_table *dev_pm_opp_get_opp_table_indexed(struct device *dev, int index);
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void dev_pm_opp_put_opp_table(struct opp_table *opp_table);
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unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);
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unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
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unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp);
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bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp);
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int dev_pm_opp_get_opp_count(struct device *dev);
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unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev);
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unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev);
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unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev);
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unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev);
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struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
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unsigned long freq,
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bool available);
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struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
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unsigned int level);
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struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
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unsigned long *freq);
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struct dev_pm_opp *dev_pm_opp_find_freq_ceil_by_volt(struct device *dev,
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unsigned long u_volt);
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struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
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unsigned long *freq);
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void dev_pm_opp_put(struct dev_pm_opp *opp);
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int dev_pm_opp_add(struct device *dev, unsigned long freq,
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unsigned long u_volt);
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void dev_pm_opp_remove(struct device *dev, unsigned long freq);
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void dev_pm_opp_remove_all_dynamic(struct device *dev);
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int dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq,
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unsigned long u_volt, unsigned long u_volt_min,
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unsigned long u_volt_max);
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int dev_pm_opp_enable(struct device *dev, unsigned long freq);
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int dev_pm_opp_disable(struct device *dev, unsigned long freq);
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int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb);
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int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb);
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struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions, unsigned int count);
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void dev_pm_opp_put_supported_hw(struct opp_table *opp_table);
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struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name);
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void dev_pm_opp_put_prop_name(struct opp_table *opp_table);
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struct opp_table *dev_pm_opp_set_regulators(struct device *dev, const char * const names[], unsigned int count);
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void dev_pm_opp_put_regulators(struct opp_table *opp_table);
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struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char * name);
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void dev_pm_opp_put_clkname(struct opp_table *opp_table);
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struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev, int (*set_opp)(struct dev_pm_set_opp_data *data));
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void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table);
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struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, const char **names, struct device ***virt_devs);
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void dev_pm_opp_detach_genpd(struct opp_table *opp_table);
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int dev_pm_opp_xlate_performance_state(struct opp_table *src_table, struct opp_table *dst_table, unsigned int pstate);
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int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq);
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int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const struct cpumask *cpumask);
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int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask);
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void dev_pm_opp_remove_table(struct device *dev);
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void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask);
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#else
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static inline struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline struct opp_table *dev_pm_opp_get_opp_table_indexed(struct device *dev, int index)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline void dev_pm_opp_put_opp_table(struct opp_table *opp_table) {}
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static inline unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
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{
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return 0;
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}
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static inline unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
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{
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return 0;
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}
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static inline unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp)
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{
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return 0;
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}
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static inline bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp)
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{
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return false;
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}
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static inline int dev_pm_opp_get_opp_count(struct device *dev)
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{
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return 0;
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}
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static inline unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
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{
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return 0;
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}
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static inline unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
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{
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return 0;
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}
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static inline unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev)
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{
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return 0;
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}
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static inline unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev)
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{
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return 0;
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}
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static inline struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
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unsigned long freq, bool available)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
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unsigned int level)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
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unsigned long *freq)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline struct dev_pm_opp *dev_pm_opp_find_freq_ceil_by_volt(struct device *dev,
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unsigned long u_volt)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
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unsigned long *freq)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline void dev_pm_opp_put(struct dev_pm_opp *opp) {}
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static inline int dev_pm_opp_add(struct device *dev, unsigned long freq,
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unsigned long u_volt)
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{
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return -ENOTSUPP;
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}
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static inline void dev_pm_opp_remove(struct device *dev, unsigned long freq)
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{
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}
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static inline void dev_pm_opp_remove_all_dynamic(struct device *dev)
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{
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}
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static inline int
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dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq,
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unsigned long u_volt, unsigned long u_volt_min,
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unsigned long u_volt_max)
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{
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return 0;
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}
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static inline int dev_pm_opp_enable(struct device *dev, unsigned long freq)
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{
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return 0;
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}
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static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq)
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{
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return 0;
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}
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static inline int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
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{
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return -ENOTSUPP;
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}
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static inline int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb)
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{
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return -ENOTSUPP;
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}
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static inline struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev,
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const u32 *versions,
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unsigned int count)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline void dev_pm_opp_put_supported_hw(struct opp_table *opp_table) {}
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static inline struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev,
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int (*set_opp)(struct dev_pm_set_opp_data *data))
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table) {}
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static inline struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline void dev_pm_opp_put_prop_name(struct opp_table *opp_table) {}
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static inline struct opp_table *dev_pm_opp_set_regulators(struct device *dev, const char * const names[], unsigned int count)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline void dev_pm_opp_put_regulators(struct opp_table *opp_table) {}
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static inline struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char * name)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline void dev_pm_opp_put_clkname(struct opp_table *opp_table) {}
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static inline struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, const char **names, struct device ***virt_devs)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline void dev_pm_opp_detach_genpd(struct opp_table *opp_table) {}
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static inline int dev_pm_opp_xlate_performance_state(struct opp_table *src_table, struct opp_table *dst_table, unsigned int pstate)
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{
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return -ENOTSUPP;
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}
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static inline int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
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{
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return -ENOTSUPP;
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}
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static inline int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const struct cpumask *cpumask)
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{
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return -ENOTSUPP;
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}
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static inline int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
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{
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return -EINVAL;
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}
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static inline void dev_pm_opp_remove_table(struct device *dev)
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{
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}
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static inline void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask)
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{
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}
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#endif /* CONFIG_PM_OPP */
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#if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)
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int dev_pm_opp_of_add_table(struct device *dev);
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int dev_pm_opp_of_add_table_indexed(struct device *dev, int index);
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void dev_pm_opp_of_remove_table(struct device *dev);
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int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask);
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void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask);
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int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask);
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struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev);
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struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp);
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int of_get_required_opp_performance_state(struct device_node *np, int index);
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void dev_pm_opp_of_register_em(struct cpumask *cpus);
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#else
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static inline int dev_pm_opp_of_add_table(struct device *dev)
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{
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return -ENOTSUPP;
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}
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static inline int dev_pm_opp_of_add_table_indexed(struct device *dev, int index)
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{
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return -ENOTSUPP;
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}
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static inline void dev_pm_opp_of_remove_table(struct device *dev)
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{
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}
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static inline int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask)
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{
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return -ENOTSUPP;
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}
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static inline void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask)
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{
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}
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static inline int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
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{
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return -ENOTSUPP;
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}
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static inline struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev)
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{
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return NULL;
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}
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static inline struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp)
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{
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return NULL;
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}
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static inline void dev_pm_opp_of_register_em(struct cpumask *cpus)
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{
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}
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static inline int of_get_required_opp_performance_state(struct device_node *np, int index)
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{
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return -ENOTSUPP;
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}
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#endif
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#endif /* __LINUX_OPP_H__ */
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