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

	dev_pm_opp_of_register_em(cpu_dev, policy->cpus);

	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,
	.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, &reg_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");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
95ceafd4 SG	2	/*
	3	* Copyright (C) 2012 Freescale Semiconductor, Inc.
	4	*
748c8766 VK	5	* Copyright (C) 2014 Linaro.
748c8766 VK	6	* Viresh Kumar <viresh.kumar@linaro.org>
95ceafd4 SG	7	*/
	8
	9	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	10
	11	#include <linux/clk.h>
e1825b25	12	#include <linux/cpu.h>
95ceafd4	13	#include <linux/cpufreq.h>
77cff592	14	#include <linux/cpumask.h>
95ceafd4	15	#include <linux/err.h>
dc279ac6	16	#include <linux/list.h>
95ceafd4 SG	17	#include <linux/module.h>
95ceafd4 SG	18	#include <linux/of.h>
e4db1c74	19	#include <linux/pm_opp.h>
5553f9e2	20	#include <linux/platform_device.h>
95ceafd4 SG	21	#include <linux/regulator/consumer.h>
95ceafd4 SG	22	#include <linux/slab.h>
77cff592	23	#include <linux/thermal.h>
95ceafd4	24
297a6622 VK	25	#include "cpufreq-dt.h"
297a6622 VK	26
d2f31f1d	27	struct private_data {
dc279ac6 SG	28	struct list_head node;
	29
	30	cpumask_var_t cpus;
d2f31f1d	31	struct device *cpu_dev;
dc279ac6	32	struct opp_table *opp_table;
873c9851	33	struct cpufreq_frequency_table *freq_table;
51c99dd2	34	bool have_static_opps;
d2f31f1d	35	};
95ceafd4	36
dc279ac6 SG	37	static LIST_HEAD(priv_list);
dc279ac6 SG	38
21c36d35 BZ	39	static struct freq_attr *cpufreq_dt_attr[] = {
	40	&cpufreq_freq_attr_scaling_available_freqs,
	41	NULL, /* Extra space for boost-attr if required */
	42	NULL,
	43	};
	44
dc279ac6 SG	45	static struct private_data *cpufreq_dt_find_data(int cpu)
	46	{
	47	struct private_data *priv;
	48
	49	list_for_each_entry(priv, &priv_list, node) {
	50	if (cpumask_test_cpu(cpu, priv->cpus))
	51	return priv;
	52	}
	53
	54	return NULL;
	55	}
	56
bbcf0719	57	static int set_target(struct cpufreq_policy *policy, unsigned int index)
95ceafd4	58	{
d2f31f1d	59	struct private_data *priv = policy->driver_data;
400ec74d	60	unsigned long freq = policy->freq_table[index].frequency;
95ceafd4	61
1a0419b0	62	return dev_pm_opp_set_rate(priv->cpu_dev, freq * 1000);
95ceafd4 SG	63	}
95ceafd4 SG	64
050794aa VK	65	/*
	66	* An earlier version of opp-v1 bindings used to name the regulator
	67	* "cpu0-supply", we still need to handle that for backwards compatibility.
	68	*/
df2c8ec2	69	static const char find_supply_name(struct device dev)
050794aa	70	{
df2c8ec2	71	struct device_node *np;
050794aa VK	72	struct property *pp;
050794aa VK	73	int cpu = dev->id;
df2c8ec2 VK	74	const char *name = NULL;
	75
	76	np = of_node_get(dev->of_node);
	77
	78	/* This must be valid for sure */
	79	if (WARN_ON(!np))
	80	return NULL;
050794aa VK	81
	82	/* Try "cpu0" for older DTs */
	83	if (!cpu) {
	84	pp = of_find_property(np, "cpu0-supply", NULL);
df2c8ec2 VK	85	if (pp) {
	86	name = "cpu0";
	87	goto node_put;
	88	}
050794aa VK	89	}
	90
	91	pp = of_find_property(np, "cpu-supply", NULL);
df2c8ec2 VK	92	if (pp) {
	93	name = "cpu";
	94	goto node_put;
	95	}
050794aa VK	96
050794aa VK	97	dev_dbg(dev, "no regulator for cpu%d\n", cpu);
df2c8ec2 VK	98	node_put:
	99	of_node_put(np);
	100	return name;
050794aa VK	101	}
050794aa VK	102
bbcf0719	103	static int cpufreq_init(struct cpufreq_policy *policy)
d2f31f1d	104	{
d2f31f1d VK	105	struct private_data *priv;
d2f31f1d VK	106	struct device *cpu_dev;
d2f31f1d VK	107	struct clk *cpu_clk;
	108	unsigned int transition_latency;
	109	int ret;
	110
dc279ac6 SG	111	priv = cpufreq_dt_find_data(policy->cpu);
	112	if (!priv) {
	113	pr_err("failed to find data for cpu%d\n", policy->cpu);
dd02a3d9 VK	114	return -ENODEV;
dd02a3d9 VK	115	}
dc279ac6	116	cpu_dev = priv->cpu_dev;
dc279ac6	117
dd02a3d9 VK	118	cpu_clk = clk_get(cpu_dev, NULL);
	119	if (IS_ERR(cpu_clk)) {
	120	ret = PTR_ERR(cpu_clk);
	121	dev_err(cpu_dev, "%s: failed to get clk: %d\n", __func__, ret);
d2f31f1d VK	122	return ret;
d2f31f1d VK	123	}
48a8624b	124
873c9851 VK	125	transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev);
	126	if (!transition_latency)
	127	transition_latency = CPUFREQ_ETERNAL;
045ee45c	128
873c9851	129	cpumask_copy(policy->cpus, priv->cpus);
d2f31f1d	130	policy->driver_data = priv;
d2f31f1d	131	policy->clk = cpu_clk;
873c9851	132	policy->freq_table = priv->freq_table;
3aa26a3b	133	policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000;
873c9851 VK	134	policy->cpuinfo.transition_latency = transition_latency;
873c9851 VK	135	policy->dvfs_possible_from_any_cpu = true;
953ba9ff	136
d15fa862 VK	137	/* Support turbo/boost mode */
	138	if (policy_has_boost_freq(policy)) {
	139	/* This gets disabled by core on driver unregister */
	140	ret = cpufreq_enable_boost_support();
	141	if (ret)
873c9851	142	goto out_clk_put;
21c36d35	143	cpufreq_dt_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs;
34e5a527 TP	144	}
34e5a527 TP	145
0e0ffa85	146	dev_pm_opp_of_register_em(cpu_dev, policy->cpus);
76d004bf	147
95ceafd4 SG	148	return 0;
95ceafd4 SG	149
873c9851	150	out_clk_put:
ed4b053c	151	clk_put(cpu_clk);
d2f31f1d VK	152
	153	return ret;
	154	}
	155
263abfe7 VK	156	static int cpufreq_online(struct cpufreq_policy *policy)
	157	{
	158	/* We did light-weight tear down earlier, nothing to do here */
	159	return 0;
	160	}
	161
	162	static int cpufreq_offline(struct cpufreq_policy *policy)
	163	{
	164	/*
	165	* Preserve policy->driver_data and don't free resources on light-weight
	166	* tear down.
	167	*/
	168	return 0;
	169	}
	170
bbcf0719	171	static int cpufreq_exit(struct cpufreq_policy *policy)
d2f31f1d	172	{
d2f31f1d	173	clk_put(policy->clk);
d2f31f1d VK	174	return 0;
	175	}
	176
bbcf0719	177	static struct cpufreq_driver dt_cpufreq_driver = {
5ae4a4b4	178	.flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK \|
e248d8d3	179	CPUFREQ_IS_COOLING_DEV,
d2f31f1d	180	.verify = cpufreq_generic_frequency_table_verify,
bbcf0719	181	.target_index = set_target,
d2f31f1d	182	.get = cpufreq_generic_get,
bbcf0719 VK	183	.init = cpufreq_init,
bbcf0719 VK	184	.exit = cpufreq_exit,
263abfe7 VK	185	.online = cpufreq_online,
263abfe7 VK	186	.offline = cpufreq_offline,
bbcf0719	187	.name = "cpufreq-dt",
21c36d35	188	.attr = cpufreq_dt_attr,
953ba9ff	189	.suspend = cpufreq_generic_suspend,
d2f31f1d VK	190	};
d2f31f1d VK	191
dc279ac6	192	static int dt_cpufreq_early_init(struct device *dev, int cpu)
d2f31f1d	193	{
dc279ac6 SG	194	struct private_data *priv;
dc279ac6 SG	195	struct device *cpu_dev;
873c9851	196	bool fallback = false;
dc279ac6	197	const char *reg_name;
d2f31f1d VK	198	int ret;
d2f31f1d VK	199
dc279ac6 SG	200	/* Check if this CPU is already covered by some other policy */
	201	if (cpufreq_dt_find_data(cpu))
	202	return 0;
	203
	204	cpu_dev = get_cpu_device(cpu);
	205	if (!cpu_dev)
	206	return -EPROBE_DEFER;
	207
	208	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	209	if (!priv)
	210	return -ENOMEM;
	211
	212	if (!alloc_cpumask_var(&priv->cpus, GFP_KERNEL))
	213	return -ENOMEM;
	214
873c9851	215	cpumask_set_cpu(cpu, priv->cpus);
dc279ac6 SG	216	priv->cpu_dev = cpu_dev;
dc279ac6 SG	217
d2f31f1d	218	/*
dc279ac6 SG	219	* OPP layer will be taking care of regulators now, but it needs to know
dc279ac6 SG	220	* the name of the regulator first.
d2f31f1d	221	*/
dc279ac6 SG	222	reg_name = find_supply_name(cpu_dev);
dc279ac6 SG	223	if (reg_name) {
873c9851 VK	224	priv->opp_table = dev_pm_opp_set_regulators(cpu_dev, &reg_name,
	225	1);
	226	if (IS_ERR(priv->opp_table)) {
	227	ret = PTR_ERR(priv->opp_table);
dc279ac6 SG	228	if (ret != -EPROBE_DEFER)
	229	dev_err(cpu_dev, "failed to set regulators: %d\n",
	230	ret);
873c9851	231	goto free_cpumask;
dc279ac6 SG	232	}
	233	}
	234
dc279ac6 SG	235	/* Get OPP-sharing information from "operating-points-v2" bindings */
	236	ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, priv->cpus);
	237	if (ret) {
	238	if (ret != -ENOENT)
873c9851	239	goto out;
dc279ac6 SG	240
	241	/*
	242	* operating-points-v2 not supported, fallback to all CPUs share
	243	* OPP for backward compatibility if the platform hasn't set
	244	* sharing CPUs.
	245	*/
873c9851 VK	246	if (dev_pm_opp_get_sharing_cpus(cpu_dev, priv->cpus))
	247	fallback = true;
	248	}
	249
	250	/*
	251	* Initialize OPP tables for all priv->cpus. They will be shared by
	252	* all CPUs which have marked their CPUs shared with OPP bindings.
	253	*
	254	* For platforms not using operating-points-v2 bindings, we do this
	255	* before updating priv->cpus. Otherwise, we will end up creating
	256	* duplicate OPPs for the CPUs.
	257	*
c3135d28 QW	258	* OPPs might be populated at runtime, don't fail for error here unless
c3135d28 QW	259	* it is -EPROBE_DEFER.
873c9851	260	*/
c3135d28 QW	261	ret = dev_pm_opp_of_cpumask_add_table(priv->cpus);
c3135d28 QW	262	if (!ret) {
873c9851	263	priv->have_static_opps = true;
c3135d28 QW	264	} else if (ret == -EPROBE_DEFER) {
	265	goto out;
	266	}
873c9851 VK	267
	268	/*
	269	* The OPP table must be initialized, statically or dynamically, by this
	270	* point.
	271	*/
	272	ret = dev_pm_opp_get_opp_count(cpu_dev);
	273	if (ret <= 0) {
	274	dev_err(cpu_dev, "OPP table can't be empty\n");
	275	ret = -ENODEV;
	276	goto out;
	277	}
	278
	279	if (fallback) {
	280	cpumask_setall(priv->cpus);
	281	ret = dev_pm_opp_set_sharing_cpus(cpu_dev, priv->cpus);
	282	if (ret)
	283	dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
	284	__func__, ret);
	285	}
	286
	287	ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &priv->freq_table);
	288	if (ret) {
	289	dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
	290	goto out;
dc279ac6 SG	291	}
	292
	293	list_add(&priv->node, &priv_list);
	294	return 0;
	295
873c9851 VK	296	out:
	297	if (priv->have_static_opps)
	298	dev_pm_opp_of_cpumask_remove_table(priv->cpus);
5f6ffb8d	299	dev_pm_opp_put_regulators(priv->opp_table);
dc279ac6 SG	300	free_cpumask:
	301	free_cpumask_var(priv->cpus);
	302	return ret;
	303	}
	304
	305	static void dt_cpufreq_release(void)
	306	{
	307	struct private_data priv, tmp;
	308
	309	list_for_each_entry_safe(priv, tmp, &priv_list, node) {
873c9851 VK	310	dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &priv->freq_table);
	311	if (priv->have_static_opps)
	312	dev_pm_opp_of_cpumask_remove_table(priv->cpus);
5f6ffb8d	313	dev_pm_opp_put_regulators(priv->opp_table);
dc279ac6 SG	314	free_cpumask_var(priv->cpus);
	315	list_del(&priv->node);
	316	}
	317	}
	318
	319	static int dt_cpufreq_probe(struct platform_device *pdev)
	320	{
	321	struct cpufreq_dt_platform_data *data = dev_get_platdata(&pdev->dev);
	322	int ret, cpu;
	323
	324	/* Request resources early so we can return in case of -EPROBE_DEFER */
	325	for_each_possible_cpu(cpu) {
	326	ret = dt_cpufreq_early_init(&pdev->dev, cpu);
	327	if (ret)
	328	goto err;
	329	}
d2f31f1d	330
67782701 VK	331	if (data) {
	332	if (data->have_governor_per_policy)
	333	dt_cpufreq_driver.flags \|= CPUFREQ_HAVE_GOVERNOR_PER_POLICY;
	334
	335	dt_cpufreq_driver.resume = data->resume;
	336	if (data->suspend)
	337	dt_cpufreq_driver.suspend = data->suspend;
0c868627 PF	338	if (data->get_intermediate) {
	339	dt_cpufreq_driver.target_intermediate = data->target_intermediate;
	340	dt_cpufreq_driver.get_intermediate = data->get_intermediate;
	341	}
67782701	342	}
297a6622	343
bbcf0719	344	ret = cpufreq_register_driver(&dt_cpufreq_driver);
dc279ac6	345	if (ret) {
dd02a3d9	346	dev_err(&pdev->dev, "failed register driver: %d\n", ret);
dc279ac6 SG	347	goto err;
dc279ac6 SG	348	}
d2f31f1d	349
dc279ac6 SG	350	return 0;
	351	err:
	352	dt_cpufreq_release();
95ceafd4 SG	353	return ret;
95ceafd4 SG	354	}
5553f9e2	355
bbcf0719	356	static int dt_cpufreq_remove(struct platform_device *pdev)
5553f9e2	357	{
bbcf0719	358	cpufreq_unregister_driver(&dt_cpufreq_driver);
dc279ac6	359	dt_cpufreq_release();
5553f9e2 SG	360	return 0;
	361	}
	362
bbcf0719	363	static struct platform_driver dt_cpufreq_platdrv = {
5553f9e2	364	.driver = {
bbcf0719	365	.name = "cpufreq-dt",
5553f9e2	366	},
bbcf0719 VK	367	.probe = dt_cpufreq_probe,
bbcf0719 VK	368	.remove = dt_cpufreq_remove,
5553f9e2	369	};
bbcf0719	370	module_platform_driver(dt_cpufreq_platdrv);
95ceafd4	371
07949bf9	372	MODULE_ALIAS("platform:cpufreq-dt");
748c8766	373	MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
95ceafd4	374	MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
bbcf0719	375	MODULE_DESCRIPTION("Generic cpufreq driver");
95ceafd4	376	MODULE_LICENSE("GPL");