15f00baf7b
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> 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>
249 lines
6.4 KiB
C
249 lines
6.4 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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 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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#if defined(CONFIG_PM_OPP)
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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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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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struct dev_pm_opp *dev_pm_opp_get_suspend_opp(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_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(struct device *dev,
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unsigned long *freq);
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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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int dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq,
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unsigned long u_volt);
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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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struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev);
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int dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions,
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unsigned int count);
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void dev_pm_opp_put_supported_hw(struct device *dev);
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int dev_pm_opp_set_prop_name(struct device *dev, const char *name);
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void dev_pm_opp_put_prop_name(struct device *dev);
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struct opp_table *dev_pm_opp_set_regulator(struct device *dev, const char *name);
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void dev_pm_opp_put_regulator(struct opp_table *opp_table);
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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 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 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 struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev)
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{
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return NULL;
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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_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(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 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 int
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dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq,
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unsigned long u_volt)
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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 struct srcu_notifier_head *dev_pm_opp_get_notifier(
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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 int 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 -ENOTSUPP;
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}
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static inline void dev_pm_opp_put_supported_hw(struct device *dev) {}
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static inline int dev_pm_opp_set_prop_name(struct device *dev, const char *name)
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{
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return -ENOTSUPP;
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}
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static inline void dev_pm_opp_put_prop_name(struct device *dev) {}
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static inline struct opp_table *dev_pm_opp_set_regulator(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_regulator(struct opp_table *opp_table) {}
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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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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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#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 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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#endif
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#endif /* __LINUX_OPP_H__ */
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