[linux-2.6-block.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/cpu_cooling.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;
	struct thermal_cooling_device *cdev;
	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;

	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_exit(struct cpufreq_policy *policy)
{
	struct private_data *priv = policy->driver_data;

	cpufreq_cooling_unregister(priv->cdev);
	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 void cpufreq_ready(struct cpufreq_policy *policy)
{
	struct private_data *priv = policy->driver_data;

	priv->cdev = of_cpufreq_cooling_register(policy);
}

static struct cpufreq_driver dt_cpufreq_driver = {
	.flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK,
	.verify = cpufreq_generic_frequency_table_verify,
	.target_index = set_target,
	.get = cpufreq_generic_get,
	.init = cpufreq_init,
	.exit = cpufreq_exit,
	.ready = cpufreq_ready,
	.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>
77cff592	16	#include <linux/cpu_cooling.h>
95ceafd4	17	#include <linux/cpufreq.h>
77cff592	18	#include <linux/cpumask.h>
95ceafd4 SG	19	#include <linux/err.h>
	20	#include <linux/module.h>
	21	#include <linux/of.h>
e4db1c74	22	#include <linux/pm_opp.h>
5553f9e2	23	#include <linux/platform_device.h>
95ceafd4 SG	24	#include <linux/regulator/consumer.h>
95ceafd4 SG	25	#include <linux/slab.h>
77cff592	26	#include <linux/thermal.h>
95ceafd4	27
297a6622 VK	28	#include "cpufreq-dt.h"
297a6622 VK	29
d2f31f1d	30	struct private_data {
91291d9a	31	struct opp_table *opp_table;
d2f31f1d	32	struct device *cpu_dev;
d2f31f1d	33	struct thermal_cooling_device *cdev;
050794aa	34	const char *reg_name;
51c99dd2	35	bool have_static_opps;
d2f31f1d	36	};
95ceafd4	37
21c36d35 BZ	38	static struct freq_attr *cpufreq_dt_attr[] = {
	39	&cpufreq_freq_attr_scaling_available_freqs,
	40	NULL, /* Extra space for boost-attr if required */
	41	NULL,
	42	};
	43
bbcf0719	44	static int set_target(struct cpufreq_policy *policy, unsigned int index)
95ceafd4	45	{
d2f31f1d	46	struct private_data *priv = policy->driver_data;
400ec74d DE	47	unsigned long freq = policy->freq_table[index].frequency;
400ec74d DE	48	int ret;
95ceafd4	49
400ec74d DE	50	ret = dev_pm_opp_set_rate(priv->cpu_dev, freq * 1000);
	51
	52	if (!ret) {
	53	arch_set_freq_scale(policy->related_cpus, freq,
	54	policy->cpuinfo.max_freq);
	55	}
	56
	57	return ret;
95ceafd4 SG	58	}
95ceafd4 SG	59
050794aa VK	60	/*
	61	* An earlier version of opp-v1 bindings used to name the regulator
	62	* "cpu0-supply", we still need to handle that for backwards compatibility.
	63	*/
df2c8ec2	64	static const char find_supply_name(struct device dev)
050794aa	65	{
df2c8ec2	66	struct device_node *np;
050794aa VK	67	struct property *pp;
050794aa VK	68	int cpu = dev->id;
df2c8ec2 VK	69	const char *name = NULL;
	70
	71	np = of_node_get(dev->of_node);
	72
	73	/* This must be valid for sure */
	74	if (WARN_ON(!np))
	75	return NULL;
050794aa VK	76
	77	/* Try "cpu0" for older DTs */
	78	if (!cpu) {
	79	pp = of_find_property(np, "cpu0-supply", NULL);
df2c8ec2 VK	80	if (pp) {
	81	name = "cpu0";
	82	goto node_put;
	83	}
050794aa VK	84	}
	85
	86	pp = of_find_property(np, "cpu-supply", NULL);
df2c8ec2 VK	87	if (pp) {
	88	name = "cpu";
	89	goto node_put;
	90	}
050794aa VK	91
050794aa VK	92	dev_dbg(dev, "no regulator for cpu%d\n", cpu);
df2c8ec2 VK	93	node_put:
	94	of_node_put(np);
	95	return name;
050794aa VK	96	}
050794aa VK	97
dd02a3d9	98	static int resources_available(void)
95ceafd4	99	{
d2f31f1d VK	100	struct device *cpu_dev;
	101	struct regulator *cpu_reg;
	102	struct clk *cpu_clk;
	103	int ret = 0;
dd02a3d9	104	const char *name;
95ceafd4	105
dd02a3d9	106	cpu_dev = get_cpu_device(0);
e1825b25	107	if (!cpu_dev) {
dd02a3d9	108	pr_err("failed to get cpu0 device\n");
e1825b25 SK	109	return -ENODEV;
e1825b25 SK	110	}
6754f556	111
dd02a3d9 VK	112	cpu_clk = clk_get(cpu_dev, NULL);
dd02a3d9 VK	113	ret = PTR_ERR_OR_ZERO(cpu_clk);
b331bc20	114	if (ret) {
fc31d6f5	115	/*
dd02a3d9 VK	116	* If cpu's clk node is present, but clock is not yet
dd02a3d9 VK	117	* registered, we should try defering probe.
fc31d6f5	118	*/
dd02a3d9 VK	119	if (ret == -EPROBE_DEFER)
	120	dev_dbg(cpu_dev, "clock not ready, retry\n");
	121	else
	122	dev_err(cpu_dev, "failed to get clock: %d\n", ret);
2d2c5e0e	123
dd02a3d9	124	return ret;
fc31d6f5 NM	125	}
fc31d6f5 NM	126
dd02a3d9 VK	127	clk_put(cpu_clk);
	128
	129	name = find_supply_name(cpu_dev);
	130	/* Platform doesn't require regulator */
	131	if (!name)
	132	return 0;
d2f31f1d	133
dd02a3d9 VK	134	cpu_reg = regulator_get_optional(cpu_dev, name);
	135	ret = PTR_ERR_OR_ZERO(cpu_reg);
	136	if (ret) {
48a8624b	137	/*
dd02a3d9 VK	138	* If cpu's regulator supply node is present, but regulator is
dd02a3d9 VK	139	* not yet registered, we should try defering probe.
48a8624b VK	140	*/
48a8624b VK	141	if (ret == -EPROBE_DEFER)
dd02a3d9	142	dev_dbg(cpu_dev, "cpu0 regulator not ready, retry\n");
48a8624b	143	else
dd02a3d9 VK	144	dev_dbg(cpu_dev, "no regulator for cpu0: %d\n", ret);
	145
	146	return ret;
d2f31f1d VK	147	}
d2f31f1d VK	148
dd02a3d9 VK	149	regulator_put(cpu_reg);
dd02a3d9 VK	150	return 0;
d2f31f1d VK	151	}
d2f31f1d VK	152
bbcf0719	153	static int cpufreq_init(struct cpufreq_policy *policy)
d2f31f1d VK	154	{
d2f31f1d VK	155	struct cpufreq_frequency_table *freq_table;
91291d9a	156	struct opp_table *opp_table = NULL;
d2f31f1d VK	157	struct private_data *priv;
d2f31f1d VK	158	struct device *cpu_dev;
d2f31f1d VK	159	struct clk *cpu_clk;
d2f31f1d VK	160	unsigned int transition_latency;
1530b996	161	bool fallback = false;
050794aa	162	const char *name;
d2f31f1d VK	163	int ret;
d2f31f1d VK	164
dd02a3d9 VK	165	cpu_dev = get_cpu_device(policy->cpu);
	166	if (!cpu_dev) {
	167	pr_err("failed to get cpu%d device\n", policy->cpu);
	168	return -ENODEV;
	169	}
	170
	171	cpu_clk = clk_get(cpu_dev, NULL);
	172	if (IS_ERR(cpu_clk)) {
	173	ret = PTR_ERR(cpu_clk);
	174	dev_err(cpu_dev, "%s: failed to get clk: %d\n", __func__, ret);
d2f31f1d VK	175	return ret;
d2f31f1d VK	176	}
48a8624b	177
2e02d872	178	/* Get OPP-sharing information from "operating-points-v2" bindings */
8f8d37b2	179	ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, policy->cpus);
2e02d872	180	if (ret) {
1530b996 VK	181	if (ret != -ENOENT)
	182	goto out_put_clk;
	183
2e02d872 VK	184	/*
2e02d872 VK	185	* operating-points-v2 not supported, fallback to old method of
1530b996 VK	186	* finding shared-OPPs for backward compatibility if the
1530b996 VK	187	* platform hasn't set sharing CPUs.
2e02d872	188	*/
1530b996 VK	189	if (dev_pm_opp_get_sharing_cpus(cpu_dev, policy->cpus))
1530b996 VK	190	fallback = true;
2e02d872 VK	191	}
2e02d872 VK	192
050794aa VK	193	/*
	194	* OPP layer will be taking care of regulators now, but it needs to know
	195	* the name of the regulator first.
	196	*/
df2c8ec2	197	name = find_supply_name(cpu_dev);
050794aa	198	if (name) {
dfbe4678	199	opp_table = dev_pm_opp_set_regulators(cpu_dev, &name, 1);
91291d9a SB	200	if (IS_ERR(opp_table)) {
91291d9a SB	201	ret = PTR_ERR(opp_table);
050794aa VK	202	dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n",
050794aa VK	203	policy->cpu, ret);
dd02a3d9	204	goto out_put_clk;
050794aa VK	205	}
	206	}
	207
51c99dd2 VK	208	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	209	if (!priv) {
	210	ret = -ENOMEM;
	211	goto out_put_regulator;
	212	}
	213
	214	priv->reg_name = name;
	215	priv->opp_table = opp_table;
	216
2e02d872 VK	217	/*
	218	* Initialize OPP tables for all policy->cpus. They will be shared by
	219	* all CPUs which have marked their CPUs shared with OPP bindings.
	220	*
	221	* For platforms not using operating-points-v2 bindings, we do this
	222	* before updating policy->cpus. Otherwise, we will end up creating
	223	* duplicate OPPs for policy->cpus.
	224	*
	225	* OPPs might be populated at runtime, don't check for error here
	226	*/
51c99dd2 VK	227	if (!dev_pm_opp_of_cpumask_add_table(policy->cpus))
51c99dd2 VK	228	priv->have_static_opps = true;
2e02d872	229
7d5d0c8b VK	230	/*
	231	* But we need OPP table to function so if it is not there let's
	232	* give platform code chance to provide it for us.
	233	*/
	234	ret = dev_pm_opp_get_opp_count(cpu_dev);
	235	if (ret <= 0) {
896d6a4c	236	dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n");
7d5d0c8b VK	237	ret = -EPROBE_DEFER;
	238	goto out_free_opp;
	239	}
	240
1530b996	241	if (fallback) {
eb96924a	242	cpumask_setall(policy->cpus);
2e02d872 VK	243
	244	/*
	245	* OPP tables are initialized only for policy->cpu, do it for
	246	* others as well.
	247	*/
8f8d37b2	248	ret = dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
8bc86284 VK	249	if (ret)
	250	dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
	251	__func__, ret);
2e02d872	252	}
95ceafd4	253
045ee45c LS	254	ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
045ee45c LS	255	if (ret) {
896d6a4c	256	dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
51c99dd2	257	goto out_free_opp;
045ee45c LS	258	}
045ee45c LS	259
d2f31f1d	260	priv->cpu_dev = cpu_dev;
d2f31f1d	261	policy->driver_data = priv;
d2f31f1d	262	policy->clk = cpu_clk;
29aa18a7	263	policy->freq_table = freq_table;
953ba9ff	264
3aa26a3b	265	policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000;
953ba9ff	266
d15fa862 VK	267	/* Support turbo/boost mode */
	268	if (policy_has_boost_freq(policy)) {
	269	/* This gets disabled by core on driver unregister */
	270	ret = cpufreq_enable_boost_support();
	271	if (ret)
	272	goto out_free_cpufreq_table;
21c36d35	273	cpufreq_dt_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs;
34e5a527 TP	274	}
34e5a527 TP	275
755b888f VK	276	transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev);
	277	if (!transition_latency)
	278	transition_latency = CPUFREQ_ETERNAL;
	279
34e5a527	280	policy->cpuinfo.transition_latency = transition_latency;
99d14d0e	281	policy->dvfs_possible_from_any_cpu = true;
34e5a527	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
bbcf0719	300	static int cpufreq_exit(struct cpufreq_policy *policy)
d2f31f1d VK	301	{
	302	struct private_data *priv = policy->driver_data;
	303
17ad13ba	304	cpufreq_cooling_unregister(priv->cdev);
d2f31f1d	305	dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
51c99dd2 VK	306	if (priv->have_static_opps)
51c99dd2 VK	307	dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
050794aa	308	if (priv->reg_name)
dfbe4678	309	dev_pm_opp_put_regulators(priv->opp_table);
050794aa	310
d2f31f1d	311	clk_put(policy->clk);
d2f31f1d VK	312	kfree(priv);
	313
	314	return 0;
	315	}
	316
9a004428 VK	317	static void cpufreq_ready(struct cpufreq_policy *policy)
	318	{
	319	struct private_data *priv = policy->driver_data;
9a004428	320
3ebb62ff	321	priv->cdev = of_cpufreq_cooling_register(policy);
9a004428 VK	322	}
9a004428 VK	323
bbcf0719	324	static struct cpufreq_driver dt_cpufreq_driver = {
d2f31f1d VK	325	.flags = CPUFREQ_STICKY \| CPUFREQ_NEED_INITIAL_FREQ_CHECK,
d2f31f1d VK	326	.verify = cpufreq_generic_frequency_table_verify,
bbcf0719	327	.target_index = set_target,
d2f31f1d	328	.get = cpufreq_generic_get,
bbcf0719 VK	329	.init = cpufreq_init,
bbcf0719 VK	330	.exit = cpufreq_exit,
9a004428	331	.ready = cpufreq_ready,
bbcf0719	332	.name = "cpufreq-dt",
21c36d35	333	.attr = cpufreq_dt_attr,
953ba9ff	334	.suspend = cpufreq_generic_suspend,
d2f31f1d VK	335	};
d2f31f1d VK	336
bbcf0719	337	static int dt_cpufreq_probe(struct platform_device *pdev)
d2f31f1d	338	{
297a6622	339	struct cpufreq_dt_platform_data *data = dev_get_platdata(&pdev->dev);
d2f31f1d VK	340	int ret;
	341
	342	/*
	343	* All per-cluster (CPUs sharing clock/voltages) initialization is done
	344	* from ->init(). In probe(), we just need to make sure that clk and
	345	* regulators are available. Else defer probe and retry.
	346	*
	347	* FIXME: Is checking this only for CPU0 sufficient ?
	348	*/
dd02a3d9	349	ret = resources_available();
d2f31f1d VK	350	if (ret)
	351	return ret;
	352
67782701 VK	353	if (data) {
	354	if (data->have_governor_per_policy)
	355	dt_cpufreq_driver.flags \|= CPUFREQ_HAVE_GOVERNOR_PER_POLICY;
	356
	357	dt_cpufreq_driver.resume = data->resume;
	358	if (data->suspend)
	359	dt_cpufreq_driver.suspend = data->suspend;
	360	}
297a6622	361
bbcf0719	362	ret = cpufreq_register_driver(&dt_cpufreq_driver);
d2f31f1d	363	if (ret)
dd02a3d9	364	dev_err(&pdev->dev, "failed register driver: %d\n", ret);
d2f31f1d	365
95ceafd4 SG	366	return ret;
95ceafd4 SG	367	}
5553f9e2	368
bbcf0719	369	static int dt_cpufreq_remove(struct platform_device *pdev)
5553f9e2	370	{
bbcf0719	371	cpufreq_unregister_driver(&dt_cpufreq_driver);
5553f9e2 SG	372	return 0;
	373	}
	374
bbcf0719	375	static struct platform_driver dt_cpufreq_platdrv = {
5553f9e2	376	.driver = {
bbcf0719	377	.name = "cpufreq-dt",
5553f9e2	378	},
bbcf0719 VK	379	.probe = dt_cpufreq_probe,
bbcf0719 VK	380	.remove = dt_cpufreq_remove,
5553f9e2	381	};
bbcf0719	382	module_platform_driver(dt_cpufreq_platdrv);
95ceafd4	383
07949bf9	384	MODULE_ALIAS("platform:cpufreq-dt");
748c8766	385	MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
95ceafd4	386	MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
bbcf0719	387	MODULE_DESCRIPTION("Generic cpufreq driver");
95ceafd4	388	MODULE_LICENSE("GPL");