[mirror_ubuntu-jammy-kernel.git] / drivers / cpufreq / cpufreq-dt.c

/*
 * Copyright (C) 2012 Freescale Semiconductor, Inc.
 *
 * Copyright (C) 2014 Linaro.
 * Viresh Kumar <viresh.kumar@linaro.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#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/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 opp_table *opp_table;
	struct device *cpu_dev;
	const char *reg_name;
	bool have_static_opps;
};

static struct freq_attr *cpufreq_dt_attr[] = {
	&cpufreq_freq_attr_scaling_available_freqs,
	NULL,   /* Extra space for boost-attr if required */
	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;
	int ret;

	ret = dev_pm_opp_set_rate(priv->cpu_dev, freq * 1000);

	if (!ret) {
		arch_set_freq_scale(policy->related_cpus, freq,
				    policy->cpuinfo.max_freq);
	}

	return ret;
}

/*
 * 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 resources_available(void)
{
	struct device *cpu_dev;
	struct regulator *cpu_reg;
	struct clk *cpu_clk;
	int ret = 0;
	const char *name;

	cpu_dev = get_cpu_device(0);
	if (!cpu_dev) {
		pr_err("failed to get cpu0 device\n");
		return -ENODEV;
	}

	cpu_clk = clk_get(cpu_dev, NULL);
	ret = PTR_ERR_OR_ZERO(cpu_clk);
	if (ret) {
		/*
		 * If cpu's clk node is present, but clock is not yet
		 * registered, we should try defering probe.
		 */
		if (ret == -EPROBE_DEFER)
			dev_dbg(cpu_dev, "clock not ready, retry\n");
		else
			dev_err(cpu_dev, "failed to get clock: %d\n", ret);

		return ret;
	}

	clk_put(cpu_clk);

	name = find_supply_name(cpu_dev);
	/* Platform doesn't require regulator */
	if (!name)
		return 0;

	cpu_reg = regulator_get_optional(cpu_dev, name);
	ret = PTR_ERR_OR_ZERO(cpu_reg);
	if (ret) {
		/*
		 * If cpu's regulator supply node is present, but regulator is
		 * not yet registered, we should try defering probe.
		 */
		if (ret == -EPROBE_DEFER)
			dev_dbg(cpu_dev, "cpu0 regulator not ready, retry\n");
		else
			dev_dbg(cpu_dev, "no regulator for cpu0: %d\n", ret);

		return ret;
	}

	regulator_put(cpu_reg);
	return 0;
}

static int cpufreq_init(struct cpufreq_policy *policy)
{
	struct cpufreq_frequency_table *freq_table;
	struct opp_table *opp_table = NULL;
	struct private_data *priv;
	struct device *cpu_dev;
	struct clk *cpu_clk;
	unsigned int transition_latency;
	bool fallback = false;
	const char *name;
	int ret;

	cpu_dev = get_cpu_device(policy->cpu);
	if (!cpu_dev) {
		pr_err("failed to get cpu%d device\n", policy->cpu);
		return -ENODEV;
	}

	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;
	}

	/* Get OPP-sharing information from "operating-points-v2" bindings */
	ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, policy->cpus);
	if (ret) {
		if (ret != -ENOENT)
			goto out_put_clk;

		/*
		 * operating-points-v2 not supported, fallback to old method of
		 * finding shared-OPPs for backward compatibility if the
		 * platform hasn't set sharing CPUs.
		 */
		if (dev_pm_opp_get_sharing_cpus(cpu_dev, policy->cpus))
			fallback = true;
	}

	/*
	 * OPP layer will be taking care of regulators now, but it needs to know
	 * the name of the regulator first.
	 */
	name = find_supply_name(cpu_dev);
	if (name) {
		opp_table = dev_pm_opp_set_regulators(cpu_dev, &name, 1);
		if (IS_ERR(opp_table)) {
			ret = PTR_ERR(opp_table);
			dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n",
				policy->cpu, ret);
			goto out_put_clk;
		}
	}

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv) {
		ret = -ENOMEM;
		goto out_put_regulator;
	}

	priv->reg_name = name;
	priv->opp_table = opp_table;

	/*
	 * Initialize OPP tables for all policy->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 policy->cpus. Otherwise, we will end up creating
	 * duplicate OPPs for policy->cpus.
	 *
	 * OPPs might be populated at runtime, don't check for error here
	 */
	if (!dev_pm_opp_of_cpumask_add_table(policy->cpus))
		priv->have_static_opps = true;

	/*
	 * But we need OPP table to function so if it is not there let's
	 * give platform code chance to provide it for us.
	 */
	ret = dev_pm_opp_get_opp_count(cpu_dev);
	if (ret <= 0) {
		dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n");
		ret = -EPROBE_DEFER;
		goto out_free_opp;
	}

	if (fallback) {
		cpumask_setall(policy->cpus);

		/*
		 * OPP tables are initialized only for policy->cpu, do it for
		 * others as well.
		 */
		ret = dev_pm_opp_set_sharing_cpus(cpu_dev, policy->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, &freq_table);
	if (ret) {
		dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
		goto out_free_opp;
	}

	priv->cpu_dev = cpu_dev;
	policy->driver_data = priv;
	policy->clk = cpu_clk;
	policy->freq_table = freq_table;

	policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000;

	/* 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_free_cpufreq_table;
		cpufreq_dt_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs;
	}

	transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev);
	if (!transition_latency)
		transition_latency = CPUFREQ_ETERNAL;

	policy->cpuinfo.transition_latency = transition_latency;
	policy->dvfs_possible_from_any_cpu = true;

	dev_pm_opp_of_register_em(policy->cpus);

	return 0;

out_free_cpufreq_table:
	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
out_free_opp:
	if (priv->have_static_opps)
		dev_pm_opp_of_cpumask_remove_table(policy->cpus);
	kfree(priv);
out_put_regulator:
	if (name)
		dev_pm_opp_put_regulators(opp_table);
out_put_clk:
	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)
{
	struct private_data *priv = policy->driver_data;

	dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
	if (priv->have_static_opps)
		dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
	if (priv->reg_name)
		dev_pm_opp_put_regulators(priv->opp_table);

	clk_put(policy->clk);
	kfree(priv);

	return 0;
}

static struct cpufreq_driver dt_cpufreq_driver = {
	.flags = CPUFREQ_STICKY | 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,
	.name = "cpufreq-dt",
	.attr = cpufreq_dt_attr,
	.suspend = cpufreq_generic_suspend,
};

static int dt_cpufreq_probe(struct platform_device *pdev)
{
	struct cpufreq_dt_platform_data *data = dev_get_platdata(&pdev->dev);
	int ret;

	/*
	 * All per-cluster (CPUs sharing clock/voltages) initialization is done
	 * from ->init(). In probe(), we just need to make sure that clk and
	 * regulators are available. Else defer probe and retry.
	 *
	 * FIXME: Is checking this only for CPU0 sufficient ?
	 */
	ret = resources_available();
	if (ret)
		return ret;

	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;
	}

	ret = cpufreq_register_driver(&dt_cpufreq_driver);
	if (ret)
		dev_err(&pdev->dev, "failed register driver: %d\n", ret);

	return ret;
}

static int dt_cpufreq_remove(struct platform_device *pdev)
{
	cpufreq_unregister_driver(&dt_cpufreq_driver);
	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");
Commit	Line	Data
95ceafd4 SG	1	/*
	2	* Copyright (C) 2012 Freescale Semiconductor, Inc.
	3	*
748c8766 VK	4	* Copyright (C) 2014 Linaro.
	5	* Viresh Kumar <viresh.kumar@linaro.org>
	6	*
95ceafd4 SG	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
	12	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	13
	14	#include <linux/clk.h>
e1825b25	15	#include <linux/cpu.h>
95ceafd4	16	#include <linux/cpufreq.h>
77cff592	17	#include <linux/cpumask.h>
95ceafd4 SG	18	#include <linux/err.h>
	19	#include <linux/module.h>
	20	#include <linux/of.h>
e4db1c74	21	#include <linux/pm_opp.h>
5553f9e2	22	#include <linux/platform_device.h>
95ceafd4 SG	23	#include <linux/regulator/consumer.h>
95ceafd4 SG	24	#include <linux/slab.h>
77cff592	25	#include <linux/thermal.h>
95ceafd4	26
297a6622 VK	27	#include "cpufreq-dt.h"
297a6622 VK	28
d2f31f1d	29	struct private_data {
91291d9a	30	struct opp_table *opp_table;
d2f31f1d	31	struct device *cpu_dev;
050794aa	32	const char *reg_name;
51c99dd2	33	bool have_static_opps;
d2f31f1d	34	};
95ceafd4	35
21c36d35 BZ	36	static struct freq_attr *cpufreq_dt_attr[] = {
	37	&cpufreq_freq_attr_scaling_available_freqs,
	38	NULL, /* Extra space for boost-attr if required */
	39	NULL,
	40	};
	41
bbcf0719	42	static int set_target(struct cpufreq_policy *policy, unsigned int index)
95ceafd4	43	{
d2f31f1d	44	struct private_data *priv = policy->driver_data;
400ec74d DE	45	unsigned long freq = policy->freq_table[index].frequency;
400ec74d DE	46	int ret;
95ceafd4	47
400ec74d DE	48	ret = dev_pm_opp_set_rate(priv->cpu_dev, freq * 1000);
	49
	50	if (!ret) {
	51	arch_set_freq_scale(policy->related_cpus, freq,
	52	policy->cpuinfo.max_freq);
	53	}
	54
	55	return ret;
95ceafd4 SG	56	}
95ceafd4 SG	57
050794aa VK	58	/*
	59	* An earlier version of opp-v1 bindings used to name the regulator
	60	* "cpu0-supply", we still need to handle that for backwards compatibility.
	61	*/
df2c8ec2	62	static const char find_supply_name(struct device dev)
050794aa	63	{
df2c8ec2	64	struct device_node *np;
050794aa VK	65	struct property *pp;
050794aa VK	66	int cpu = dev->id;
df2c8ec2 VK	67	const char *name = NULL;
	68
	69	np = of_node_get(dev->of_node);
	70
	71	/* This must be valid for sure */
	72	if (WARN_ON(!np))
	73	return NULL;
050794aa VK	74
	75	/* Try "cpu0" for older DTs */
	76	if (!cpu) {
	77	pp = of_find_property(np, "cpu0-supply", NULL);
df2c8ec2 VK	78	if (pp) {
	79	name = "cpu0";
	80	goto node_put;
	81	}
050794aa VK	82	}
	83
	84	pp = of_find_property(np, "cpu-supply", NULL);
df2c8ec2 VK	85	if (pp) {
	86	name = "cpu";
	87	goto node_put;
	88	}
050794aa VK	89
050794aa VK	90	dev_dbg(dev, "no regulator for cpu%d\n", cpu);
df2c8ec2 VK	91	node_put:
	92	of_node_put(np);
	93	return name;
050794aa VK	94	}
050794aa VK	95
dd02a3d9	96	static int resources_available(void)
95ceafd4	97	{
d2f31f1d VK	98	struct device *cpu_dev;
	99	struct regulator *cpu_reg;
	100	struct clk *cpu_clk;
	101	int ret = 0;
dd02a3d9	102	const char *name;
95ceafd4	103
dd02a3d9	104	cpu_dev = get_cpu_device(0);
e1825b25	105	if (!cpu_dev) {
dd02a3d9	106	pr_err("failed to get cpu0 device\n");
e1825b25 SH	107	return -ENODEV;
e1825b25 SH	108	}
6754f556	109
dd02a3d9 VK	110	cpu_clk = clk_get(cpu_dev, NULL);
dd02a3d9 VK	111	ret = PTR_ERR_OR_ZERO(cpu_clk);
b331bc20	112	if (ret) {
fc31d6f5	113	/*
dd02a3d9 VK	114	* If cpu's clk node is present, but clock is not yet
dd02a3d9 VK	115	* registered, we should try defering probe.
fc31d6f5	116	*/
dd02a3d9 VK	117	if (ret == -EPROBE_DEFER)
	118	dev_dbg(cpu_dev, "clock not ready, retry\n");
	119	else
	120	dev_err(cpu_dev, "failed to get clock: %d\n", ret);
2d2c5e0e	121
dd02a3d9	122	return ret;
fc31d6f5 NM	123	}
fc31d6f5 NM	124
dd02a3d9 VK	125	clk_put(cpu_clk);
	126
	127	name = find_supply_name(cpu_dev);
	128	/* Platform doesn't require regulator */
	129	if (!name)
	130	return 0;
d2f31f1d	131
dd02a3d9 VK	132	cpu_reg = regulator_get_optional(cpu_dev, name);
	133	ret = PTR_ERR_OR_ZERO(cpu_reg);
	134	if (ret) {
48a8624b	135	/*
dd02a3d9 VK	136	* If cpu's regulator supply node is present, but regulator is
dd02a3d9 VK	137	* not yet registered, we should try defering probe.
48a8624b VK	138	*/
48a8624b VK	139	if (ret == -EPROBE_DEFER)
dd02a3d9	140	dev_dbg(cpu_dev, "cpu0 regulator not ready, retry\n");
48a8624b	141	else
dd02a3d9 VK	142	dev_dbg(cpu_dev, "no regulator for cpu0: %d\n", ret);
	143
	144	return ret;
d2f31f1d VK	145	}
d2f31f1d VK	146
dd02a3d9 VK	147	regulator_put(cpu_reg);
dd02a3d9 VK	148	return 0;
d2f31f1d VK	149	}
d2f31f1d VK	150
bbcf0719	151	static int cpufreq_init(struct cpufreq_policy *policy)
d2f31f1d VK	152	{
d2f31f1d VK	153	struct cpufreq_frequency_table *freq_table;
91291d9a	154	struct opp_table *opp_table = NULL;
d2f31f1d VK	155	struct private_data *priv;
d2f31f1d VK	156	struct device *cpu_dev;
d2f31f1d VK	157	struct clk *cpu_clk;
d2f31f1d VK	158	unsigned int transition_latency;
1530b996	159	bool fallback = false;
050794aa	160	const char *name;
d2f31f1d VK	161	int ret;
d2f31f1d VK	162
dd02a3d9 VK	163	cpu_dev = get_cpu_device(policy->cpu);
	164	if (!cpu_dev) {
	165	pr_err("failed to get cpu%d device\n", policy->cpu);
	166	return -ENODEV;
	167	}
	168
	169	cpu_clk = clk_get(cpu_dev, NULL);
	170	if (IS_ERR(cpu_clk)) {
	171	ret = PTR_ERR(cpu_clk);
	172	dev_err(cpu_dev, "%s: failed to get clk: %d\n", __func__, ret);
d2f31f1d VK	173	return ret;
d2f31f1d VK	174	}
48a8624b	175
2e02d872	176	/* Get OPP-sharing information from "operating-points-v2" bindings */
8f8d37b2	177	ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, policy->cpus);
2e02d872	178	if (ret) {
1530b996 VK	179	if (ret != -ENOENT)
	180	goto out_put_clk;
	181
2e02d872 VK	182	/*
2e02d872 VK	183	* operating-points-v2 not supported, fallback to old method of
1530b996 VK	184	* finding shared-OPPs for backward compatibility if the
1530b996 VK	185	* platform hasn't set sharing CPUs.
2e02d872	186	*/
1530b996 VK	187	if (dev_pm_opp_get_sharing_cpus(cpu_dev, policy->cpus))
1530b996 VK	188	fallback = true;
2e02d872 VK	189	}
2e02d872 VK	190
050794aa VK	191	/*
	192	* OPP layer will be taking care of regulators now, but it needs to know
	193	* the name of the regulator first.
	194	*/
df2c8ec2	195	name = find_supply_name(cpu_dev);
050794aa	196	if (name) {
dfbe4678	197	opp_table = dev_pm_opp_set_regulators(cpu_dev, &name, 1);
91291d9a SB	198	if (IS_ERR(opp_table)) {
91291d9a SB	199	ret = PTR_ERR(opp_table);
050794aa VK	200	dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n",
050794aa VK	201	policy->cpu, ret);
dd02a3d9	202	goto out_put_clk;
050794aa VK	203	}
	204	}
	205
51c99dd2 VK	206	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	207	if (!priv) {
	208	ret = -ENOMEM;
	209	goto out_put_regulator;
	210	}
	211
	212	priv->reg_name = name;
	213	priv->opp_table = opp_table;
	214
2e02d872 VK	215	/*
	216	* Initialize OPP tables for all policy->cpus. They will be shared by
	217	* all CPUs which have marked their CPUs shared with OPP bindings.
	218	*
	219	* For platforms not using operating-points-v2 bindings, we do this
	220	* before updating policy->cpus. Otherwise, we will end up creating
	221	* duplicate OPPs for policy->cpus.
	222	*
	223	* OPPs might be populated at runtime, don't check for error here
	224	*/
51c99dd2 VK	225	if (!dev_pm_opp_of_cpumask_add_table(policy->cpus))
51c99dd2 VK	226	priv->have_static_opps = true;
2e02d872	227
7d5d0c8b VK	228	/*
	229	* But we need OPP table to function so if it is not there let's
	230	* give platform code chance to provide it for us.
	231	*/
	232	ret = dev_pm_opp_get_opp_count(cpu_dev);
	233	if (ret <= 0) {
896d6a4c	234	dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n");
7d5d0c8b VK	235	ret = -EPROBE_DEFER;
	236	goto out_free_opp;
	237	}
	238
1530b996	239	if (fallback) {
eb96924a	240	cpumask_setall(policy->cpus);
2e02d872 VK	241
	242	/*
	243	* OPP tables are initialized only for policy->cpu, do it for
	244	* others as well.
	245	*/
8f8d37b2	246	ret = dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
8bc86284 VK	247	if (ret)
	248	dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
	249	__func__, ret);
2e02d872	250	}
95ceafd4	251
045ee45c LS	252	ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
045ee45c LS	253	if (ret) {
896d6a4c	254	dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
51c99dd2	255	goto out_free_opp;
045ee45c LS	256	}
045ee45c LS	257
d2f31f1d	258	priv->cpu_dev = cpu_dev;
d2f31f1d	259	policy->driver_data = priv;
d2f31f1d	260	policy->clk = cpu_clk;
29aa18a7	261	policy->freq_table = freq_table;
953ba9ff	262
3aa26a3b	263	policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000;
953ba9ff	264
d15fa862 VK	265	/* Support turbo/boost mode */
	266	if (policy_has_boost_freq(policy)) {
	267	/* This gets disabled by core on driver unregister */
	268	ret = cpufreq_enable_boost_support();
	269	if (ret)
	270	goto out_free_cpufreq_table;
21c36d35	271	cpufreq_dt_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs;
34e5a527 TP	272	}
34e5a527 TP	273
755b888f VK	274	transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev);
	275	if (!transition_latency)
	276	transition_latency = CPUFREQ_ETERNAL;
	277
34e5a527	278	policy->cpuinfo.transition_latency = transition_latency;
99d14d0e	279	policy->dvfs_possible_from_any_cpu = true;
34e5a527	280
76d004bf QP	281	dev_pm_opp_of_register_em(policy->cpus);
76d004bf QP	282
95ceafd4 SG	283	return 0;
95ceafd4 SG	284
9a004428	285	out_free_cpufreq_table:
5d4879cd	286	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
2f0f609f	287	out_free_opp:
51c99dd2 VK	288	if (priv->have_static_opps)
	289	dev_pm_opp_of_cpumask_remove_table(policy->cpus);
	290	kfree(priv);
	291	out_put_regulator:
050794aa	292	if (name)
dfbe4678	293	dev_pm_opp_put_regulators(opp_table);
dd02a3d9	294	out_put_clk:
ed4b053c	295	clk_put(cpu_clk);
d2f31f1d VK	296
	297	return ret;
	298	}
	299
263abfe7 VK	300	static int cpufreq_online(struct cpufreq_policy *policy)
	301	{
	302	/* We did light-weight tear down earlier, nothing to do here */
	303	return 0;
	304	}
	305
	306	static int cpufreq_offline(struct cpufreq_policy *policy)
	307	{
	308	/*
	309	* Preserve policy->driver_data and don't free resources on light-weight
	310	* tear down.
	311	*/
	312	return 0;
	313	}
	314
bbcf0719	315	static int cpufreq_exit(struct cpufreq_policy *policy)
d2f31f1d VK	316	{
	317	struct private_data *priv = policy->driver_data;
	318
d2f31f1d	319	dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
51c99dd2 VK	320	if (priv->have_static_opps)
51c99dd2 VK	321	dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
050794aa	322	if (priv->reg_name)
dfbe4678	323	dev_pm_opp_put_regulators(priv->opp_table);
050794aa	324
d2f31f1d	325	clk_put(policy->clk);
d2f31f1d VK	326	kfree(priv);
	327
	328	return 0;
	329	}
	330
bbcf0719	331	static struct cpufreq_driver dt_cpufreq_driver = {
e248d8d3 AK	332	.flags = CPUFREQ_STICKY \| CPUFREQ_NEED_INITIAL_FREQ_CHECK \|
e248d8d3 AK	333	CPUFREQ_IS_COOLING_DEV,
d2f31f1d	334	.verify = cpufreq_generic_frequency_table_verify,
bbcf0719	335	.target_index = set_target,
d2f31f1d	336	.get = cpufreq_generic_get,
bbcf0719 VK	337	.init = cpufreq_init,
bbcf0719 VK	338	.exit = cpufreq_exit,
263abfe7 VK	339	.online = cpufreq_online,
263abfe7 VK	340	.offline = cpufreq_offline,
bbcf0719	341	.name = "cpufreq-dt",
21c36d35	342	.attr = cpufreq_dt_attr,
953ba9ff	343	.suspend = cpufreq_generic_suspend,
d2f31f1d VK	344	};
d2f31f1d VK	345
bbcf0719	346	static int dt_cpufreq_probe(struct platform_device *pdev)
d2f31f1d	347	{
297a6622	348	struct cpufreq_dt_platform_data *data = dev_get_platdata(&pdev->dev);
d2f31f1d VK	349	int ret;
	350
	351	/*
	352	* All per-cluster (CPUs sharing clock/voltages) initialization is done
	353	* from ->init(). In probe(), we just need to make sure that clk and
	354	* regulators are available. Else defer probe and retry.
	355	*
	356	* FIXME: Is checking this only for CPU0 sufficient ?
	357	*/
dd02a3d9	358	ret = resources_available();
d2f31f1d VK	359	if (ret)
	360	return ret;
	361
67782701 VK	362	if (data) {
	363	if (data->have_governor_per_policy)
	364	dt_cpufreq_driver.flags \|= CPUFREQ_HAVE_GOVERNOR_PER_POLICY;
	365
	366	dt_cpufreq_driver.resume = data->resume;
	367	if (data->suspend)
	368	dt_cpufreq_driver.suspend = data->suspend;
	369	}
297a6622	370
bbcf0719	371	ret = cpufreq_register_driver(&dt_cpufreq_driver);
d2f31f1d	372	if (ret)
dd02a3d9	373	dev_err(&pdev->dev, "failed register driver: %d\n", ret);
d2f31f1d	374
95ceafd4 SG	375	return ret;
95ceafd4 SG	376	}
5553f9e2	377
bbcf0719	378	static int dt_cpufreq_remove(struct platform_device *pdev)
5553f9e2	379	{
bbcf0719	380	cpufreq_unregister_driver(&dt_cpufreq_driver);
5553f9e2 SG	381	return 0;
	382	}
	383
bbcf0719	384	static struct platform_driver dt_cpufreq_platdrv = {
5553f9e2	385	.driver = {
bbcf0719	386	.name = "cpufreq-dt",
5553f9e2	387	},
bbcf0719 VK	388	.probe = dt_cpufreq_probe,
bbcf0719 VK	389	.remove = dt_cpufreq_remove,
5553f9e2	390	};
bbcf0719	391	module_platform_driver(dt_cpufreq_platdrv);
95ceafd4	392
07949bf9	393	MODULE_ALIAS("platform:cpufreq-dt");
748c8766	394	MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
95ceafd4	395	MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
bbcf0719	396	MODULE_DESCRIPTION("Generic cpufreq driver");
95ceafd4	397	MODULE_LICENSE("GPL");