403 lines
9.6 KiB
C
403 lines
9.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2012 Freescale Semiconductor, Inc.
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*
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* Copyright (C) 2014 Linaro.
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* Viresh Kumar <viresh.kumar@linaro.org>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/clk.h>
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#include <linux/cpu.h>
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#include <linux/cpufreq.h>
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#include <linux/cpumask.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/of.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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#include <linux/thermal.h>
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#include "cpufreq-dt.h"
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struct private_data {
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struct opp_table *opp_table;
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struct device *cpu_dev;
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const char *reg_name;
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bool have_static_opps;
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};
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static struct freq_attr *cpufreq_dt_attr[] = {
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&cpufreq_freq_attr_scaling_available_freqs,
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NULL, /* Extra space for boost-attr if required */
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NULL,
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};
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static int set_target(struct cpufreq_policy *policy, unsigned int index)
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{
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struct private_data *priv = policy->driver_data;
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unsigned long freq = policy->freq_table[index].frequency;
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int ret;
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ret = dev_pm_opp_set_rate(priv->cpu_dev, freq * 1000);
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if (!ret) {
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arch_set_freq_scale(policy->related_cpus, freq,
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policy->cpuinfo.max_freq);
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}
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return ret;
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}
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/*
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* An earlier version of opp-v1 bindings used to name the regulator
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* "cpu0-supply", we still need to handle that for backwards compatibility.
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*/
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static const char *find_supply_name(struct device *dev)
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{
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struct device_node *np;
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struct property *pp;
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int cpu = dev->id;
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const char *name = NULL;
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np = of_node_get(dev->of_node);
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/* This must be valid for sure */
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if (WARN_ON(!np))
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return NULL;
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/* Try "cpu0" for older DTs */
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if (!cpu) {
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pp = of_find_property(np, "cpu0-supply", NULL);
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if (pp) {
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name = "cpu0";
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goto node_put;
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}
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}
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pp = of_find_property(np, "cpu-supply", NULL);
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if (pp) {
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name = "cpu";
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goto node_put;
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}
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dev_dbg(dev, "no regulator for cpu%d\n", cpu);
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node_put:
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of_node_put(np);
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return name;
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}
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static int resources_available(void)
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{
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struct device *cpu_dev;
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struct regulator *cpu_reg;
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struct clk *cpu_clk;
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int ret = 0;
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const char *name;
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cpu_dev = get_cpu_device(0);
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if (!cpu_dev) {
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pr_err("failed to get cpu0 device\n");
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return -ENODEV;
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}
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cpu_clk = clk_get(cpu_dev, NULL);
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ret = PTR_ERR_OR_ZERO(cpu_clk);
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if (ret) {
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/*
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* If cpu's clk node is present, but clock is not yet
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* registered, we should try defering probe.
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*/
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if (ret == -EPROBE_DEFER)
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dev_dbg(cpu_dev, "clock not ready, retry\n");
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else
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dev_err(cpu_dev, "failed to get clock: %d\n", ret);
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return ret;
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}
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clk_put(cpu_clk);
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ret = dev_pm_opp_of_find_icc_paths(cpu_dev, NULL);
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if (ret)
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return ret;
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name = find_supply_name(cpu_dev);
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/* Platform doesn't require regulator */
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if (!name)
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return 0;
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cpu_reg = regulator_get_optional(cpu_dev, name);
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ret = PTR_ERR_OR_ZERO(cpu_reg);
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if (ret) {
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/*
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* If cpu's regulator supply node is present, but regulator is
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* not yet registered, we should try defering probe.
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*/
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if (ret == -EPROBE_DEFER)
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dev_dbg(cpu_dev, "cpu0 regulator not ready, retry\n");
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else
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dev_dbg(cpu_dev, "no regulator for cpu0: %d\n", ret);
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return ret;
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}
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regulator_put(cpu_reg);
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return 0;
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}
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static int cpufreq_init(struct cpufreq_policy *policy)
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{
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struct cpufreq_frequency_table *freq_table;
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struct opp_table *opp_table = NULL;
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struct private_data *priv;
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struct device *cpu_dev;
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struct clk *cpu_clk;
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unsigned int transition_latency;
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bool fallback = false;
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const char *name;
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int ret;
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cpu_dev = get_cpu_device(policy->cpu);
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if (!cpu_dev) {
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pr_err("failed to get cpu%d device\n", policy->cpu);
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return -ENODEV;
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}
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cpu_clk = clk_get(cpu_dev, NULL);
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if (IS_ERR(cpu_clk)) {
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ret = PTR_ERR(cpu_clk);
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dev_err(cpu_dev, "%s: failed to get clk: %d\n", __func__, ret);
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return ret;
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}
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/* Get OPP-sharing information from "operating-points-v2" bindings */
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ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, policy->cpus);
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if (ret) {
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if (ret != -ENOENT)
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goto out_put_clk;
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/*
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* operating-points-v2 not supported, fallback to old method of
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* finding shared-OPPs for backward compatibility if the
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* platform hasn't set sharing CPUs.
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*/
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if (dev_pm_opp_get_sharing_cpus(cpu_dev, policy->cpus))
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fallback = true;
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}
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/*
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* OPP layer will be taking care of regulators now, but it needs to know
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* the name of the regulator first.
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*/
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name = find_supply_name(cpu_dev);
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if (name) {
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opp_table = dev_pm_opp_set_regulators(cpu_dev, &name, 1);
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if (IS_ERR(opp_table)) {
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ret = PTR_ERR(opp_table);
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dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n",
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policy->cpu, ret);
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goto out_put_clk;
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}
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}
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv) {
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ret = -ENOMEM;
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goto out_put_regulator;
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}
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priv->reg_name = name;
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priv->opp_table = opp_table;
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/*
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* Initialize OPP tables for all policy->cpus. They will be shared by
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* all CPUs which have marked their CPUs shared with OPP bindings.
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*
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* For platforms not using operating-points-v2 bindings, we do this
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* before updating policy->cpus. Otherwise, we will end up creating
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* duplicate OPPs for policy->cpus.
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*
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* OPPs might be populated at runtime, don't check for error here
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*/
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if (!dev_pm_opp_of_cpumask_add_table(policy->cpus))
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priv->have_static_opps = true;
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/*
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* But we need OPP table to function so if it is not there let's
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* give platform code chance to provide it for us.
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*/
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ret = dev_pm_opp_get_opp_count(cpu_dev);
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if (ret <= 0) {
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dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n");
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ret = -EPROBE_DEFER;
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goto out_free_opp;
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}
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if (fallback) {
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cpumask_setall(policy->cpus);
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/*
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* OPP tables are initialized only for policy->cpu, do it for
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* others as well.
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*/
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ret = dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
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if (ret)
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dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
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__func__, ret);
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}
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ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
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if (ret) {
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dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
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goto out_free_opp;
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}
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priv->cpu_dev = cpu_dev;
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policy->driver_data = priv;
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policy->clk = cpu_clk;
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policy->freq_table = freq_table;
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policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000;
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/* Support turbo/boost mode */
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if (policy_has_boost_freq(policy)) {
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/* This gets disabled by core on driver unregister */
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ret = cpufreq_enable_boost_support();
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if (ret)
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goto out_free_cpufreq_table;
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cpufreq_dt_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs;
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}
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transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev);
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if (!transition_latency)
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transition_latency = CPUFREQ_ETERNAL;
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policy->cpuinfo.transition_latency = transition_latency;
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policy->dvfs_possible_from_any_cpu = true;
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dev_pm_opp_of_register_em(policy->cpus);
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return 0;
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out_free_cpufreq_table:
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dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
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out_free_opp:
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if (priv->have_static_opps)
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dev_pm_opp_of_cpumask_remove_table(policy->cpus);
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kfree(priv);
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out_put_regulator:
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if (name)
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dev_pm_opp_put_regulators(opp_table);
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out_put_clk:
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clk_put(cpu_clk);
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return ret;
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}
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static int cpufreq_online(struct cpufreq_policy *policy)
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{
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/* We did light-weight tear down earlier, nothing to do here */
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return 0;
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}
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static int cpufreq_offline(struct cpufreq_policy *policy)
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{
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/*
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* Preserve policy->driver_data and don't free resources on light-weight
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* tear down.
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*/
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return 0;
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}
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static int cpufreq_exit(struct cpufreq_policy *policy)
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{
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struct private_data *priv = policy->driver_data;
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dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
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if (priv->have_static_opps)
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dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
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if (priv->reg_name)
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dev_pm_opp_put_regulators(priv->opp_table);
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clk_put(policy->clk);
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kfree(priv);
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return 0;
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}
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static struct cpufreq_driver dt_cpufreq_driver = {
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.flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK |
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CPUFREQ_IS_COOLING_DEV,
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.verify = cpufreq_generic_frequency_table_verify,
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.target_index = set_target,
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.get = cpufreq_generic_get,
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.init = cpufreq_init,
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.exit = cpufreq_exit,
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.online = cpufreq_online,
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.offline = cpufreq_offline,
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.name = "cpufreq-dt",
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.attr = cpufreq_dt_attr,
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.suspend = cpufreq_generic_suspend,
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};
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static int dt_cpufreq_probe(struct platform_device *pdev)
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{
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struct cpufreq_dt_platform_data *data = dev_get_platdata(&pdev->dev);
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int ret;
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/*
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* All per-cluster (CPUs sharing clock/voltages) initialization is done
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* from ->init(). In probe(), we just need to make sure that clk and
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* regulators are available. Else defer probe and retry.
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*
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* FIXME: Is checking this only for CPU0 sufficient ?
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*/
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ret = resources_available();
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if (ret)
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return ret;
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if (data) {
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if (data->have_governor_per_policy)
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dt_cpufreq_driver.flags |= CPUFREQ_HAVE_GOVERNOR_PER_POLICY;
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dt_cpufreq_driver.resume = data->resume;
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if (data->suspend)
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dt_cpufreq_driver.suspend = data->suspend;
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if (data->get_intermediate) {
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dt_cpufreq_driver.target_intermediate = data->target_intermediate;
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dt_cpufreq_driver.get_intermediate = data->get_intermediate;
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}
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}
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ret = cpufreq_register_driver(&dt_cpufreq_driver);
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if (ret)
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dev_err(&pdev->dev, "failed register driver: %d\n", ret);
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return ret;
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}
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static int dt_cpufreq_remove(struct platform_device *pdev)
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{
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cpufreq_unregister_driver(&dt_cpufreq_driver);
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return 0;
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}
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static struct platform_driver dt_cpufreq_platdrv = {
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.driver = {
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.name = "cpufreq-dt",
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},
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.probe = dt_cpufreq_probe,
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.remove = dt_cpufreq_remove,
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};
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module_platform_driver(dt_cpufreq_platdrv);
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MODULE_ALIAS("platform:cpufreq-dt");
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MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
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MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
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MODULE_DESCRIPTION("Generic cpufreq driver");
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MODULE_LICENSE("GPL");
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