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![Rafael J. Wysocki](/assets/img/avatar_default.png)
* pm-devfreq: PM / devfreq: Modify the device name as devfreq(X) for sysfs PM / devfreq: Simplify the sysfs name of devfreq-event device PM / devfreq: Remove unnecessary separate _remove_devfreq() PM / devfreq: Fix wrong trans_stat of passive devfreq device PM / devfreq: Fix available_governor sysfs PM / devfreq: exynos-ppmu: Show the registred device for ppmu device PM / devfreq: Fix the wrong description for userspace governor PM / devfreq: Fix the checkpatch warnings PM / devfreq: exynos-bus: Print the real clock rate of bus PM / devfreq: exynos-ppmu: Use the regmap interface to handle the registers PM / devfreq: exynos-bus: Add the detailed correlation for Exynos5433 PM / devfreq: Don't delete sysfs group twice
568 lines
14 KiB
C
568 lines
14 KiB
C
/*
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* Generic Exynos Bus frequency driver with DEVFREQ Framework
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*
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* Copyright (c) 2016 Samsung Electronics Co., Ltd.
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* Author : Chanwoo Choi <cw00.choi@samsung.com>
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*
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* This driver support Exynos Bus frequency feature by using
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* DEVFREQ framework and is based on drivers/devfreq/exynos/exynos4_bus.c.
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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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#include <linux/clk.h>
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#include <linux/devfreq.h>
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#include <linux/devfreq-event.h>
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#include <linux/device.h>
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#include <linux/export.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/pm_opp.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/consumer.h>
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#include <linux/slab.h>
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#define DEFAULT_SATURATION_RATIO 40
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#define DEFAULT_VOLTAGE_TOLERANCE 2
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struct exynos_bus {
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struct device *dev;
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struct devfreq *devfreq;
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struct devfreq_event_dev **edev;
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unsigned int edev_count;
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struct mutex lock;
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unsigned long curr_freq;
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struct regulator *regulator;
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struct clk *clk;
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unsigned int voltage_tolerance;
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unsigned int ratio;
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};
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/*
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* Control the devfreq-event device to get the current state of bus
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*/
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#define exynos_bus_ops_edev(ops) \
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static int exynos_bus_##ops(struct exynos_bus *bus) \
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{ \
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int i, ret; \
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\
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for (i = 0; i < bus->edev_count; i++) { \
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if (!bus->edev[i]) \
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continue; \
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ret = devfreq_event_##ops(bus->edev[i]); \
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if (ret < 0) \
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return ret; \
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} \
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\
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return 0; \
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}
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exynos_bus_ops_edev(enable_edev);
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exynos_bus_ops_edev(disable_edev);
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exynos_bus_ops_edev(set_event);
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static int exynos_bus_get_event(struct exynos_bus *bus,
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struct devfreq_event_data *edata)
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{
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struct devfreq_event_data event_data;
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unsigned long load_count = 0, total_count = 0;
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int i, ret = 0;
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for (i = 0; i < bus->edev_count; i++) {
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if (!bus->edev[i])
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continue;
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ret = devfreq_event_get_event(bus->edev[i], &event_data);
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if (ret < 0)
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return ret;
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if (i == 0 || event_data.load_count > load_count) {
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load_count = event_data.load_count;
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total_count = event_data.total_count;
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}
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}
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edata->load_count = load_count;
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edata->total_count = total_count;
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return ret;
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}
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/*
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* Must necessary function for devfreq simple-ondemand governor
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*/
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static int exynos_bus_target(struct device *dev, unsigned long *freq, u32 flags)
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{
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struct exynos_bus *bus = dev_get_drvdata(dev);
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struct dev_pm_opp *new_opp;
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unsigned long old_freq, new_freq, new_volt, tol;
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int ret = 0;
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/* Get new opp-bus instance according to new bus clock */
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new_opp = devfreq_recommended_opp(dev, freq, flags);
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if (IS_ERR(new_opp)) {
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dev_err(dev, "failed to get recommended opp instance\n");
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return PTR_ERR(new_opp);
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}
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new_freq = dev_pm_opp_get_freq(new_opp);
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new_volt = dev_pm_opp_get_voltage(new_opp);
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dev_pm_opp_put(new_opp);
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old_freq = bus->curr_freq;
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if (old_freq == new_freq)
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return 0;
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tol = new_volt * bus->voltage_tolerance / 100;
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/* Change voltage and frequency according to new OPP level */
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mutex_lock(&bus->lock);
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if (old_freq < new_freq) {
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ret = regulator_set_voltage_tol(bus->regulator, new_volt, tol);
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if (ret < 0) {
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dev_err(bus->dev, "failed to set voltage\n");
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goto out;
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}
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}
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ret = clk_set_rate(bus->clk, new_freq);
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if (ret < 0) {
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dev_err(dev, "failed to change clock of bus\n");
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clk_set_rate(bus->clk, old_freq);
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goto out;
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}
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if (old_freq > new_freq) {
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ret = regulator_set_voltage_tol(bus->regulator, new_volt, tol);
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if (ret < 0) {
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dev_err(bus->dev, "failed to set voltage\n");
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goto out;
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}
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}
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bus->curr_freq = new_freq;
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dev_dbg(dev, "Set the frequency of bus (%luHz -> %luHz, %luHz)\n",
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old_freq, new_freq, clk_get_rate(bus->clk));
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out:
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mutex_unlock(&bus->lock);
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return ret;
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}
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static int exynos_bus_get_dev_status(struct device *dev,
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struct devfreq_dev_status *stat)
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{
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struct exynos_bus *bus = dev_get_drvdata(dev);
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struct devfreq_event_data edata;
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int ret;
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stat->current_frequency = bus->curr_freq;
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ret = exynos_bus_get_event(bus, &edata);
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if (ret < 0) {
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stat->total_time = stat->busy_time = 0;
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goto err;
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}
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stat->busy_time = (edata.load_count * 100) / bus->ratio;
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stat->total_time = edata.total_count;
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dev_dbg(dev, "Usage of devfreq-event : %lu/%lu\n", stat->busy_time,
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stat->total_time);
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err:
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ret = exynos_bus_set_event(bus);
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if (ret < 0) {
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dev_err(dev, "failed to set event to devfreq-event devices\n");
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return ret;
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}
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return ret;
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}
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static void exynos_bus_exit(struct device *dev)
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{
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struct exynos_bus *bus = dev_get_drvdata(dev);
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int ret;
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ret = exynos_bus_disable_edev(bus);
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if (ret < 0)
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dev_warn(dev, "failed to disable the devfreq-event devices\n");
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if (bus->regulator)
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regulator_disable(bus->regulator);
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dev_pm_opp_of_remove_table(dev);
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clk_disable_unprepare(bus->clk);
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}
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/*
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* Must necessary function for devfreq passive governor
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*/
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static int exynos_bus_passive_target(struct device *dev, unsigned long *freq,
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u32 flags)
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{
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struct exynos_bus *bus = dev_get_drvdata(dev);
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struct dev_pm_opp *new_opp;
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unsigned long old_freq, new_freq;
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int ret = 0;
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/* Get new opp-bus instance according to new bus clock */
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new_opp = devfreq_recommended_opp(dev, freq, flags);
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if (IS_ERR(new_opp)) {
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dev_err(dev, "failed to get recommended opp instance\n");
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return PTR_ERR(new_opp);
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}
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new_freq = dev_pm_opp_get_freq(new_opp);
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dev_pm_opp_put(new_opp);
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old_freq = bus->curr_freq;
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if (old_freq == new_freq)
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return 0;
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/* Change the frequency according to new OPP level */
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mutex_lock(&bus->lock);
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ret = clk_set_rate(bus->clk, new_freq);
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if (ret < 0) {
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dev_err(dev, "failed to set the clock of bus\n");
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goto out;
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}
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*freq = new_freq;
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bus->curr_freq = new_freq;
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dev_dbg(dev, "Set the frequency of bus (%luHz -> %luHz, %luHz)\n",
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old_freq, new_freq, clk_get_rate(bus->clk));
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out:
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mutex_unlock(&bus->lock);
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return ret;
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}
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static void exynos_bus_passive_exit(struct device *dev)
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{
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struct exynos_bus *bus = dev_get_drvdata(dev);
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dev_pm_opp_of_remove_table(dev);
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clk_disable_unprepare(bus->clk);
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}
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static int exynos_bus_parent_parse_of(struct device_node *np,
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struct exynos_bus *bus)
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{
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struct device *dev = bus->dev;
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int i, ret, count, size;
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/* Get the regulator to provide each bus with the power */
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bus->regulator = devm_regulator_get(dev, "vdd");
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if (IS_ERR(bus->regulator)) {
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dev_err(dev, "failed to get VDD regulator\n");
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return PTR_ERR(bus->regulator);
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}
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ret = regulator_enable(bus->regulator);
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if (ret < 0) {
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dev_err(dev, "failed to enable VDD regulator\n");
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return ret;
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}
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/*
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* Get the devfreq-event devices to get the current utilization of
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* buses. This raw data will be used in devfreq ondemand governor.
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*/
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count = devfreq_event_get_edev_count(dev);
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if (count < 0) {
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dev_err(dev, "failed to get the count of devfreq-event dev\n");
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ret = count;
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goto err_regulator;
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}
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bus->edev_count = count;
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size = sizeof(*bus->edev) * count;
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bus->edev = devm_kzalloc(dev, size, GFP_KERNEL);
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if (!bus->edev) {
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ret = -ENOMEM;
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goto err_regulator;
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}
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for (i = 0; i < count; i++) {
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bus->edev[i] = devfreq_event_get_edev_by_phandle(dev, i);
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if (IS_ERR(bus->edev[i])) {
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ret = -EPROBE_DEFER;
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goto err_regulator;
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}
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}
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/*
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* Optionally, Get the saturation ratio according to Exynos SoC
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* When measuring the utilization of each AXI bus with devfreq-event
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* devices, the measured real cycle might be much lower than the
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* total cycle of bus during sampling rate. In result, the devfreq
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* simple-ondemand governor might not decide to change the current
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* frequency due to too utilization (= real cycle/total cycle).
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* So, this property is used to adjust the utilization when calculating
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* the busy_time in exynos_bus_get_dev_status().
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*/
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if (of_property_read_u32(np, "exynos,saturation-ratio", &bus->ratio))
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bus->ratio = DEFAULT_SATURATION_RATIO;
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if (of_property_read_u32(np, "exynos,voltage-tolerance",
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&bus->voltage_tolerance))
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bus->voltage_tolerance = DEFAULT_VOLTAGE_TOLERANCE;
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return 0;
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err_regulator:
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regulator_disable(bus->regulator);
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return ret;
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}
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static int exynos_bus_parse_of(struct device_node *np,
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struct exynos_bus *bus)
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{
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struct device *dev = bus->dev;
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struct dev_pm_opp *opp;
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unsigned long rate;
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int ret;
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/* Get the clock to provide each bus with source clock */
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bus->clk = devm_clk_get(dev, "bus");
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if (IS_ERR(bus->clk)) {
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dev_err(dev, "failed to get bus clock\n");
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return PTR_ERR(bus->clk);
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}
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ret = clk_prepare_enable(bus->clk);
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if (ret < 0) {
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dev_err(dev, "failed to get enable clock\n");
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return ret;
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}
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/* Get the freq and voltage from OPP table to scale the bus freq */
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ret = dev_pm_opp_of_add_table(dev);
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if (ret < 0) {
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dev_err(dev, "failed to get OPP table\n");
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goto err_clk;
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}
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rate = clk_get_rate(bus->clk);
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opp = devfreq_recommended_opp(dev, &rate, 0);
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if (IS_ERR(opp)) {
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dev_err(dev, "failed to find dev_pm_opp\n");
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ret = PTR_ERR(opp);
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goto err_opp;
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}
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bus->curr_freq = dev_pm_opp_get_freq(opp);
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dev_pm_opp_put(opp);
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return 0;
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err_opp:
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dev_pm_opp_of_remove_table(dev);
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err_clk:
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clk_disable_unprepare(bus->clk);
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return ret;
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}
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static int exynos_bus_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node, *node;
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struct devfreq_dev_profile *profile;
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struct devfreq_simple_ondemand_data *ondemand_data;
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struct devfreq_passive_data *passive_data;
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struct devfreq *parent_devfreq;
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struct exynos_bus *bus;
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int ret, max_state;
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unsigned long min_freq, max_freq;
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if (!np) {
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dev_err(dev, "failed to find devicetree node\n");
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return -EINVAL;
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}
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bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);
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if (!bus)
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return -ENOMEM;
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mutex_init(&bus->lock);
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bus->dev = &pdev->dev;
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platform_set_drvdata(pdev, bus);
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/* Parse the device-tree to get the resource information */
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ret = exynos_bus_parse_of(np, bus);
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if (ret < 0)
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return ret;
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profile = devm_kzalloc(dev, sizeof(*profile), GFP_KERNEL);
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if (!profile) {
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ret = -ENOMEM;
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goto err;
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}
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node = of_parse_phandle(dev->of_node, "devfreq", 0);
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if (node) {
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of_node_put(node);
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goto passive;
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} else {
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ret = exynos_bus_parent_parse_of(np, bus);
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}
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if (ret < 0)
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goto err;
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/* Initialize the struct profile and governor data for parent device */
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profile->polling_ms = 50;
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profile->target = exynos_bus_target;
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profile->get_dev_status = exynos_bus_get_dev_status;
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profile->exit = exynos_bus_exit;
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ondemand_data = devm_kzalloc(dev, sizeof(*ondemand_data), GFP_KERNEL);
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if (!ondemand_data) {
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ret = -ENOMEM;
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goto err;
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}
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ondemand_data->upthreshold = 40;
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ondemand_data->downdifferential = 5;
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/* Add devfreq device to monitor and handle the exynos bus */
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bus->devfreq = devm_devfreq_add_device(dev, profile, "simple_ondemand",
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ondemand_data);
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if (IS_ERR(bus->devfreq)) {
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dev_err(dev, "failed to add devfreq device\n");
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ret = PTR_ERR(bus->devfreq);
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goto err;
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}
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/* Register opp_notifier to catch the change of OPP */
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ret = devm_devfreq_register_opp_notifier(dev, bus->devfreq);
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if (ret < 0) {
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dev_err(dev, "failed to register opp notifier\n");
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goto err;
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}
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/*
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* Enable devfreq-event to get raw data which is used to determine
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* current bus load.
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*/
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ret = exynos_bus_enable_edev(bus);
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if (ret < 0) {
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dev_err(dev, "failed to enable devfreq-event devices\n");
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goto err;
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}
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ret = exynos_bus_set_event(bus);
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if (ret < 0) {
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dev_err(dev, "failed to set event to devfreq-event devices\n");
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goto err;
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}
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goto out;
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passive:
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/* Initialize the struct profile and governor data for passive device */
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profile->target = exynos_bus_passive_target;
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profile->exit = exynos_bus_passive_exit;
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/* Get the instance of parent devfreq device */
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parent_devfreq = devfreq_get_devfreq_by_phandle(dev, 0);
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if (IS_ERR(parent_devfreq)) {
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ret = -EPROBE_DEFER;
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goto err;
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}
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passive_data = devm_kzalloc(dev, sizeof(*passive_data), GFP_KERNEL);
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if (!passive_data) {
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ret = -ENOMEM;
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goto err;
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}
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passive_data->parent = parent_devfreq;
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/* Add devfreq device for exynos bus with passive governor */
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bus->devfreq = devm_devfreq_add_device(dev, profile, "passive",
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passive_data);
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if (IS_ERR(bus->devfreq)) {
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dev_err(dev,
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"failed to add devfreq dev with passive governor\n");
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ret = PTR_ERR(bus->devfreq);
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goto err;
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}
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out:
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max_state = bus->devfreq->profile->max_state;
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min_freq = (bus->devfreq->profile->freq_table[0] / 1000);
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max_freq = (bus->devfreq->profile->freq_table[max_state - 1] / 1000);
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pr_info("exynos-bus: new bus device registered: %s (%6ld KHz ~ %6ld KHz)\n",
|
|
dev_name(dev), min_freq, max_freq);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
dev_pm_opp_of_remove_table(dev);
|
|
clk_disable_unprepare(bus->clk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int exynos_bus_resume(struct device *dev)
|
|
{
|
|
struct exynos_bus *bus = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
ret = exynos_bus_enable_edev(bus);
|
|
if (ret < 0) {
|
|
dev_err(dev, "failed to enable the devfreq-event devices\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int exynos_bus_suspend(struct device *dev)
|
|
{
|
|
struct exynos_bus *bus = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
ret = exynos_bus_disable_edev(bus);
|
|
if (ret < 0) {
|
|
dev_err(dev, "failed to disable the devfreq-event devices\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static const struct dev_pm_ops exynos_bus_pm = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(exynos_bus_suspend, exynos_bus_resume)
|
|
};
|
|
|
|
static const struct of_device_id exynos_bus_of_match[] = {
|
|
{ .compatible = "samsung,exynos-bus", },
|
|
{ /* sentinel */ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, exynos_bus_of_match);
|
|
|
|
static struct platform_driver exynos_bus_platdrv = {
|
|
.probe = exynos_bus_probe,
|
|
.driver = {
|
|
.name = "exynos-bus",
|
|
.pm = &exynos_bus_pm,
|
|
.of_match_table = of_match_ptr(exynos_bus_of_match),
|
|
},
|
|
};
|
|
module_platform_driver(exynos_bus_platdrv);
|
|
|
|
MODULE_DESCRIPTION("Generic Exynos Bus frequency driver");
|
|
MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
|
|
MODULE_LICENSE("GPL v2");
|