mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Viresh Kumar](/assets/img/avatar_default.png)
Set the newly added .register_em() callback with cpufreq_register_em_with_opp() to register with the EM core. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
375 lines
8.8 KiB
C
375 lines
8.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) 2012 Freescale Semiconductor, Inc.
|
|
*
|
|
* Copyright (C) 2014 Linaro.
|
|
* Viresh Kumar <viresh.kumar@linaro.org>
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/clk.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/cpufreq.h>
|
|
#include <linux/cpumask.h>
|
|
#include <linux/err.h>
|
|
#include <linux/list.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/pm_opp.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regulator/consumer.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/thermal.h>
|
|
|
|
#include "cpufreq-dt.h"
|
|
|
|
struct private_data {
|
|
struct list_head node;
|
|
|
|
cpumask_var_t cpus;
|
|
struct device *cpu_dev;
|
|
struct opp_table *opp_table;
|
|
struct cpufreq_frequency_table *freq_table;
|
|
bool have_static_opps;
|
|
};
|
|
|
|
static LIST_HEAD(priv_list);
|
|
|
|
static struct freq_attr *cpufreq_dt_attr[] = {
|
|
&cpufreq_freq_attr_scaling_available_freqs,
|
|
NULL, /* Extra space for boost-attr if required */
|
|
NULL,
|
|
};
|
|
|
|
static struct private_data *cpufreq_dt_find_data(int cpu)
|
|
{
|
|
struct private_data *priv;
|
|
|
|
list_for_each_entry(priv, &priv_list, node) {
|
|
if (cpumask_test_cpu(cpu, priv->cpus))
|
|
return priv;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int set_target(struct cpufreq_policy *policy, unsigned int index)
|
|
{
|
|
struct private_data *priv = policy->driver_data;
|
|
unsigned long freq = policy->freq_table[index].frequency;
|
|
|
|
return dev_pm_opp_set_rate(priv->cpu_dev, freq * 1000);
|
|
}
|
|
|
|
/*
|
|
* An earlier version of opp-v1 bindings used to name the regulator
|
|
* "cpu0-supply", we still need to handle that for backwards compatibility.
|
|
*/
|
|
static const char *find_supply_name(struct device *dev)
|
|
{
|
|
struct device_node *np;
|
|
struct property *pp;
|
|
int cpu = dev->id;
|
|
const char *name = NULL;
|
|
|
|
np = of_node_get(dev->of_node);
|
|
|
|
/* This must be valid for sure */
|
|
if (WARN_ON(!np))
|
|
return NULL;
|
|
|
|
/* Try "cpu0" for older DTs */
|
|
if (!cpu) {
|
|
pp = of_find_property(np, "cpu0-supply", NULL);
|
|
if (pp) {
|
|
name = "cpu0";
|
|
goto node_put;
|
|
}
|
|
}
|
|
|
|
pp = of_find_property(np, "cpu-supply", NULL);
|
|
if (pp) {
|
|
name = "cpu";
|
|
goto node_put;
|
|
}
|
|
|
|
dev_dbg(dev, "no regulator for cpu%d\n", cpu);
|
|
node_put:
|
|
of_node_put(np);
|
|
return name;
|
|
}
|
|
|
|
static int cpufreq_init(struct cpufreq_policy *policy)
|
|
{
|
|
struct private_data *priv;
|
|
struct device *cpu_dev;
|
|
struct clk *cpu_clk;
|
|
unsigned int transition_latency;
|
|
int ret;
|
|
|
|
priv = cpufreq_dt_find_data(policy->cpu);
|
|
if (!priv) {
|
|
pr_err("failed to find data for cpu%d\n", policy->cpu);
|
|
return -ENODEV;
|
|
}
|
|
cpu_dev = priv->cpu_dev;
|
|
|
|
cpu_clk = clk_get(cpu_dev, NULL);
|
|
if (IS_ERR(cpu_clk)) {
|
|
ret = PTR_ERR(cpu_clk);
|
|
dev_err(cpu_dev, "%s: failed to get clk: %d\n", __func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev);
|
|
if (!transition_latency)
|
|
transition_latency = CPUFREQ_ETERNAL;
|
|
|
|
cpumask_copy(policy->cpus, priv->cpus);
|
|
policy->driver_data = priv;
|
|
policy->clk = cpu_clk;
|
|
policy->freq_table = priv->freq_table;
|
|
policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000;
|
|
policy->cpuinfo.transition_latency = transition_latency;
|
|
policy->dvfs_possible_from_any_cpu = true;
|
|
|
|
/* Support turbo/boost mode */
|
|
if (policy_has_boost_freq(policy)) {
|
|
/* This gets disabled by core on driver unregister */
|
|
ret = cpufreq_enable_boost_support();
|
|
if (ret)
|
|
goto out_clk_put;
|
|
cpufreq_dt_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_clk_put:
|
|
clk_put(cpu_clk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int cpufreq_online(struct cpufreq_policy *policy)
|
|
{
|
|
/* We did light-weight tear down earlier, nothing to do here */
|
|
return 0;
|
|
}
|
|
|
|
static int cpufreq_offline(struct cpufreq_policy *policy)
|
|
{
|
|
/*
|
|
* Preserve policy->driver_data and don't free resources on light-weight
|
|
* tear down.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
static int cpufreq_exit(struct cpufreq_policy *policy)
|
|
{
|
|
clk_put(policy->clk);
|
|
return 0;
|
|
}
|
|
|
|
static struct cpufreq_driver dt_cpufreq_driver = {
|
|
.flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK |
|
|
CPUFREQ_IS_COOLING_DEV,
|
|
.verify = cpufreq_generic_frequency_table_verify,
|
|
.target_index = set_target,
|
|
.get = cpufreq_generic_get,
|
|
.init = cpufreq_init,
|
|
.exit = cpufreq_exit,
|
|
.online = cpufreq_online,
|
|
.offline = cpufreq_offline,
|
|
.register_em = cpufreq_register_em_with_opp,
|
|
.name = "cpufreq-dt",
|
|
.attr = cpufreq_dt_attr,
|
|
.suspend = cpufreq_generic_suspend,
|
|
};
|
|
|
|
static int dt_cpufreq_early_init(struct device *dev, int cpu)
|
|
{
|
|
struct private_data *priv;
|
|
struct device *cpu_dev;
|
|
bool fallback = false;
|
|
const char *reg_name;
|
|
int ret;
|
|
|
|
/* Check if this CPU is already covered by some other policy */
|
|
if (cpufreq_dt_find_data(cpu))
|
|
return 0;
|
|
|
|
cpu_dev = get_cpu_device(cpu);
|
|
if (!cpu_dev)
|
|
return -EPROBE_DEFER;
|
|
|
|
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
if (!alloc_cpumask_var(&priv->cpus, GFP_KERNEL))
|
|
return -ENOMEM;
|
|
|
|
cpumask_set_cpu(cpu, priv->cpus);
|
|
priv->cpu_dev = cpu_dev;
|
|
|
|
/*
|
|
* OPP layer will be taking care of regulators now, but it needs to know
|
|
* the name of the regulator first.
|
|
*/
|
|
reg_name = find_supply_name(cpu_dev);
|
|
if (reg_name) {
|
|
priv->opp_table = dev_pm_opp_set_regulators(cpu_dev, ®_name,
|
|
1);
|
|
if (IS_ERR(priv->opp_table)) {
|
|
ret = PTR_ERR(priv->opp_table);
|
|
if (ret != -EPROBE_DEFER)
|
|
dev_err(cpu_dev, "failed to set regulators: %d\n",
|
|
ret);
|
|
goto free_cpumask;
|
|
}
|
|
}
|
|
|
|
/* Get OPP-sharing information from "operating-points-v2" bindings */
|
|
ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, priv->cpus);
|
|
if (ret) {
|
|
if (ret != -ENOENT)
|
|
goto out;
|
|
|
|
/*
|
|
* operating-points-v2 not supported, fallback to all CPUs share
|
|
* OPP for backward compatibility if the platform hasn't set
|
|
* sharing CPUs.
|
|
*/
|
|
if (dev_pm_opp_get_sharing_cpus(cpu_dev, priv->cpus))
|
|
fallback = true;
|
|
}
|
|
|
|
/*
|
|
* Initialize OPP tables for all priv->cpus. They will be shared by
|
|
* all CPUs which have marked their CPUs shared with OPP bindings.
|
|
*
|
|
* For platforms not using operating-points-v2 bindings, we do this
|
|
* before updating priv->cpus. Otherwise, we will end up creating
|
|
* duplicate OPPs for the CPUs.
|
|
*
|
|
* OPPs might be populated at runtime, don't fail for error here unless
|
|
* it is -EPROBE_DEFER.
|
|
*/
|
|
ret = dev_pm_opp_of_cpumask_add_table(priv->cpus);
|
|
if (!ret) {
|
|
priv->have_static_opps = true;
|
|
} else if (ret == -EPROBE_DEFER) {
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* The OPP table must be initialized, statically or dynamically, by this
|
|
* point.
|
|
*/
|
|
ret = dev_pm_opp_get_opp_count(cpu_dev);
|
|
if (ret <= 0) {
|
|
dev_err(cpu_dev, "OPP table can't be empty\n");
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
if (fallback) {
|
|
cpumask_setall(priv->cpus);
|
|
ret = dev_pm_opp_set_sharing_cpus(cpu_dev, priv->cpus);
|
|
if (ret)
|
|
dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
|
|
__func__, ret);
|
|
}
|
|
|
|
ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &priv->freq_table);
|
|
if (ret) {
|
|
dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
|
|
goto out;
|
|
}
|
|
|
|
list_add(&priv->node, &priv_list);
|
|
return 0;
|
|
|
|
out:
|
|
if (priv->have_static_opps)
|
|
dev_pm_opp_of_cpumask_remove_table(priv->cpus);
|
|
dev_pm_opp_put_regulators(priv->opp_table);
|
|
free_cpumask:
|
|
free_cpumask_var(priv->cpus);
|
|
return ret;
|
|
}
|
|
|
|
static void dt_cpufreq_release(void)
|
|
{
|
|
struct private_data *priv, *tmp;
|
|
|
|
list_for_each_entry_safe(priv, tmp, &priv_list, node) {
|
|
dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &priv->freq_table);
|
|
if (priv->have_static_opps)
|
|
dev_pm_opp_of_cpumask_remove_table(priv->cpus);
|
|
dev_pm_opp_put_regulators(priv->opp_table);
|
|
free_cpumask_var(priv->cpus);
|
|
list_del(&priv->node);
|
|
}
|
|
}
|
|
|
|
static int dt_cpufreq_probe(struct platform_device *pdev)
|
|
{
|
|
struct cpufreq_dt_platform_data *data = dev_get_platdata(&pdev->dev);
|
|
int ret, cpu;
|
|
|
|
/* Request resources early so we can return in case of -EPROBE_DEFER */
|
|
for_each_possible_cpu(cpu) {
|
|
ret = dt_cpufreq_early_init(&pdev->dev, cpu);
|
|
if (ret)
|
|
goto err;
|
|
}
|
|
|
|
if (data) {
|
|
if (data->have_governor_per_policy)
|
|
dt_cpufreq_driver.flags |= CPUFREQ_HAVE_GOVERNOR_PER_POLICY;
|
|
|
|
dt_cpufreq_driver.resume = data->resume;
|
|
if (data->suspend)
|
|
dt_cpufreq_driver.suspend = data->suspend;
|
|
if (data->get_intermediate) {
|
|
dt_cpufreq_driver.target_intermediate = data->target_intermediate;
|
|
dt_cpufreq_driver.get_intermediate = data->get_intermediate;
|
|
}
|
|
}
|
|
|
|
ret = cpufreq_register_driver(&dt_cpufreq_driver);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed register driver: %d\n", ret);
|
|
goto err;
|
|
}
|
|
|
|
return 0;
|
|
err:
|
|
dt_cpufreq_release();
|
|
return ret;
|
|
}
|
|
|
|
static int dt_cpufreq_remove(struct platform_device *pdev)
|
|
{
|
|
cpufreq_unregister_driver(&dt_cpufreq_driver);
|
|
dt_cpufreq_release();
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver dt_cpufreq_platdrv = {
|
|
.driver = {
|
|
.name = "cpufreq-dt",
|
|
},
|
|
.probe = dt_cpufreq_probe,
|
|
.remove = dt_cpufreq_remove,
|
|
};
|
|
module_platform_driver(dt_cpufreq_platdrv);
|
|
|
|
MODULE_ALIAS("platform:cpufreq-dt");
|
|
MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
|
|
MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
|
|
MODULE_DESCRIPTION("Generic cpufreq driver");
|
|
MODULE_LICENSE("GPL");
|