[mirror_ubuntu-artful-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/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;
};

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;

	return dev_pm_opp_set_rate(priv->cpu_dev,
				   policy->freq_table[index].frequency * 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 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;
		}
	}

	/*
	 * 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
	 */
	dev_pm_opp_of_cpumask_add_table(policy->cpus);

	/*
	 * 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);
	}

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

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

	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_priv;
	}

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

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

	ret = cpufreq_table_validate_and_show(policy, freq_table);
	if (ret) {
		dev_err(cpu_dev, "%s: invalid frequency table: %d\n", __func__,
			ret);
		goto out_free_cpufreq_table;
	}

	/* 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;

	return 0;

out_free_cpufreq_table:
	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
out_free_priv:
	kfree(priv);
out_free_opp:
	dev_pm_opp_of_cpumask_remove_table(policy->cpus);
	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);
	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;
	struct device_node *np = of_node_get(priv->cpu_dev->of_node);

	if (WARN_ON(!np))
		return;

	/*
	 * For now, just loading the cooling device;
	 * thermal DT code takes care of matching them.
	 */
	if (of_find_property(np, "#cooling-cells", NULL)) {
		u32 power_coefficient = 0;

		of_property_read_u32(np, "dynamic-power-coefficient",
				     &power_coefficient);

		priv->cdev = of_cpufreq_power_cooling_register(np,
				policy, power_coefficient, NULL);
		if (IS_ERR(priv->cdev)) {
			dev_err(priv->cpu_dev,
				"running cpufreq without cooling device: %ld\n",
				PTR_ERR(priv->cdev));

			priv->cdev = NULL;
		}
	}

	of_node_put(np);
}

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 && data->have_governor_per_policy)
		dt_cpufreq_driver.flags |= CPUFREQ_HAVE_GOVERNOR_PER_POLICY;

	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;
d2f31f1d	35	};
95ceafd4	36
21c36d35 BZ	37	static struct freq_attr *cpufreq_dt_attr[] = {
	38	&cpufreq_freq_attr_scaling_available_freqs,
	39	NULL, /* Extra space for boost-attr if required */
	40	NULL,
	41	};
	42
bbcf0719	43	static int set_target(struct cpufreq_policy *policy, unsigned int index)
95ceafd4	44	{
d2f31f1d	45	struct private_data *priv = policy->driver_data;
95ceafd4	46
78c3ba5d VK	47	return dev_pm_opp_set_rate(priv->cpu_dev,
78c3ba5d VK	48	policy->freq_table[index].frequency * 1000);
95ceafd4 SG	49	}
95ceafd4 SG	50
050794aa VK	51	/*
	52	* An earlier version of opp-v1 bindings used to name the regulator
	53	* "cpu0-supply", we still need to handle that for backwards compatibility.
	54	*/
df2c8ec2	55	static const char find_supply_name(struct device dev)
050794aa	56	{
df2c8ec2	57	struct device_node *np;
050794aa VK	58	struct property *pp;
050794aa VK	59	int cpu = dev->id;
df2c8ec2 VK	60	const char *name = NULL;
	61
	62	np = of_node_get(dev->of_node);
	63
	64	/* This must be valid for sure */
	65	if (WARN_ON(!np))
	66	return NULL;
050794aa VK	67
	68	/* Try "cpu0" for older DTs */
	69	if (!cpu) {
	70	pp = of_find_property(np, "cpu0-supply", NULL);
df2c8ec2 VK	71	if (pp) {
	72	name = "cpu0";
	73	goto node_put;
	74	}
050794aa VK	75	}
	76
	77	pp = of_find_property(np, "cpu-supply", NULL);
df2c8ec2 VK	78	if (pp) {
	79	name = "cpu";
	80	goto node_put;
	81	}
050794aa VK	82
050794aa VK	83	dev_dbg(dev, "no regulator for cpu%d\n", cpu);
df2c8ec2 VK	84	node_put:
	85	of_node_put(np);
	86	return name;
050794aa VK	87	}
050794aa VK	88
dd02a3d9	89	static int resources_available(void)
95ceafd4	90	{
d2f31f1d VK	91	struct device *cpu_dev;
	92	struct regulator *cpu_reg;
	93	struct clk *cpu_clk;
	94	int ret = 0;
dd02a3d9	95	const char *name;
95ceafd4	96
dd02a3d9	97	cpu_dev = get_cpu_device(0);
e1825b25	98	if (!cpu_dev) {
dd02a3d9	99	pr_err("failed to get cpu0 device\n");
e1825b25 SH	100	return -ENODEV;
e1825b25 SH	101	}
6754f556	102
dd02a3d9 VK	103	cpu_clk = clk_get(cpu_dev, NULL);
dd02a3d9 VK	104	ret = PTR_ERR_OR_ZERO(cpu_clk);
b331bc20	105	if (ret) {
fc31d6f5	106	/*
dd02a3d9 VK	107	* If cpu's clk node is present, but clock is not yet
dd02a3d9 VK	108	* registered, we should try defering probe.
fc31d6f5	109	*/
dd02a3d9 VK	110	if (ret == -EPROBE_DEFER)
	111	dev_dbg(cpu_dev, "clock not ready, retry\n");
	112	else
	113	dev_err(cpu_dev, "failed to get clock: %d\n", ret);
2d2c5e0e	114
dd02a3d9	115	return ret;
fc31d6f5 NM	116	}
fc31d6f5 NM	117
dd02a3d9 VK	118	clk_put(cpu_clk);
	119
	120	name = find_supply_name(cpu_dev);
	121	/* Platform doesn't require regulator */
	122	if (!name)
	123	return 0;
d2f31f1d	124
dd02a3d9 VK	125	cpu_reg = regulator_get_optional(cpu_dev, name);
	126	ret = PTR_ERR_OR_ZERO(cpu_reg);
	127	if (ret) {
48a8624b	128	/*
dd02a3d9 VK	129	* If cpu's regulator supply node is present, but regulator is
dd02a3d9 VK	130	* not yet registered, we should try defering probe.
48a8624b VK	131	*/
48a8624b VK	132	if (ret == -EPROBE_DEFER)
dd02a3d9	133	dev_dbg(cpu_dev, "cpu0 regulator not ready, retry\n");
48a8624b	134	else
dd02a3d9 VK	135	dev_dbg(cpu_dev, "no regulator for cpu0: %d\n", ret);
	136
	137	return ret;
d2f31f1d VK	138	}
d2f31f1d VK	139
dd02a3d9 VK	140	regulator_put(cpu_reg);
dd02a3d9 VK	141	return 0;
d2f31f1d VK	142	}
d2f31f1d VK	143
bbcf0719	144	static int cpufreq_init(struct cpufreq_policy *policy)
d2f31f1d VK	145	{
d2f31f1d VK	146	struct cpufreq_frequency_table *freq_table;
91291d9a	147	struct opp_table *opp_table = NULL;
d2f31f1d VK	148	struct private_data *priv;
d2f31f1d VK	149	struct device *cpu_dev;
d2f31f1d VK	150	struct clk *cpu_clk;
d2f31f1d VK	151	unsigned int transition_latency;
1530b996	152	bool fallback = false;
050794aa	153	const char *name;
d2f31f1d VK	154	int ret;
d2f31f1d VK	155
dd02a3d9 VK	156	cpu_dev = get_cpu_device(policy->cpu);
	157	if (!cpu_dev) {
	158	pr_err("failed to get cpu%d device\n", policy->cpu);
	159	return -ENODEV;
	160	}
	161
	162	cpu_clk = clk_get(cpu_dev, NULL);
	163	if (IS_ERR(cpu_clk)) {
	164	ret = PTR_ERR(cpu_clk);
	165	dev_err(cpu_dev, "%s: failed to get clk: %d\n", __func__, ret);
d2f31f1d VK	166	return ret;
d2f31f1d VK	167	}
48a8624b	168
2e02d872	169	/* Get OPP-sharing information from "operating-points-v2" bindings */
8f8d37b2	170	ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, policy->cpus);
2e02d872	171	if (ret) {
1530b996 VK	172	if (ret != -ENOENT)
	173	goto out_put_clk;
	174
2e02d872 VK	175	/*
2e02d872 VK	176	* operating-points-v2 not supported, fallback to old method of
1530b996 VK	177	* finding shared-OPPs for backward compatibility if the
1530b996 VK	178	* platform hasn't set sharing CPUs.
2e02d872	179	*/
1530b996 VK	180	if (dev_pm_opp_get_sharing_cpus(cpu_dev, policy->cpus))
1530b996 VK	181	fallback = true;
2e02d872 VK	182	}
2e02d872 VK	183
050794aa VK	184	/*
	185	* OPP layer will be taking care of regulators now, but it needs to know
	186	* the name of the regulator first.
	187	*/
df2c8ec2	188	name = find_supply_name(cpu_dev);
050794aa	189	if (name) {
dfbe4678	190	opp_table = dev_pm_opp_set_regulators(cpu_dev, &name, 1);
91291d9a SB	191	if (IS_ERR(opp_table)) {
91291d9a SB	192	ret = PTR_ERR(opp_table);
050794aa VK	193	dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n",
050794aa VK	194	policy->cpu, ret);
dd02a3d9	195	goto out_put_clk;
050794aa VK	196	}
	197	}
	198
2e02d872 VK	199	/*
	200	* Initialize OPP tables for all policy->cpus. They will be shared by
	201	* all CPUs which have marked their CPUs shared with OPP bindings.
	202	*
	203	* For platforms not using operating-points-v2 bindings, we do this
	204	* before updating policy->cpus. Otherwise, we will end up creating
	205	* duplicate OPPs for policy->cpus.
	206	*
	207	* OPPs might be populated at runtime, don't check for error here
	208	*/
8f8d37b2	209	dev_pm_opp_of_cpumask_add_table(policy->cpus);
2e02d872	210
7d5d0c8b VK	211	/*
	212	* But we need OPP table to function so if it is not there let's
	213	* give platform code chance to provide it for us.
	214	*/
	215	ret = dev_pm_opp_get_opp_count(cpu_dev);
	216	if (ret <= 0) {
896d6a4c	217	dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n");
7d5d0c8b VK	218	ret = -EPROBE_DEFER;
	219	goto out_free_opp;
	220	}
	221
1530b996	222	if (fallback) {
eb96924a	223	cpumask_setall(policy->cpus);
2e02d872 VK	224
	225	/*
	226	* OPP tables are initialized only for policy->cpu, do it for
	227	* others as well.
	228	*/
8f8d37b2	229	ret = dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
8bc86284 VK	230	if (ret)
	231	dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
	232	__func__, ret);
2e02d872	233	}
95ceafd4	234
d2f31f1d VK	235	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	236	if (!priv) {
	237	ret = -ENOMEM;
2f0f609f	238	goto out_free_opp;
95ceafd4 SG	239	}
95ceafd4 SG	240
050794aa	241	priv->reg_name = name;
91291d9a	242	priv->opp_table = opp_table;
95ceafd4	243
045ee45c LS	244	ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
045ee45c LS	245	if (ret) {
896d6a4c	246	dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
045ee45c LS	247	goto out_free_priv;
	248	}
	249
d2f31f1d	250	priv->cpu_dev = cpu_dev;
d2f31f1d	251	policy->driver_data = priv;
d2f31f1d	252	policy->clk = cpu_clk;
953ba9ff	253
3aa26a3b	254	policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000;
953ba9ff	255
34e5a527 TP	256	ret = cpufreq_table_validate_and_show(policy, freq_table);
	257	if (ret) {
	258	dev_err(cpu_dev, "%s: invalid frequency table: %d\n", __func__,
	259	ret);
9a004428	260	goto out_free_cpufreq_table;
d15fa862 VK	261	}
	262
	263	/* Support turbo/boost mode */
	264	if (policy_has_boost_freq(policy)) {
	265	/* This gets disabled by core on driver unregister */
	266	ret = cpufreq_enable_boost_support();
	267	if (ret)
	268	goto out_free_cpufreq_table;
21c36d35	269	cpufreq_dt_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs;
34e5a527 TP	270	}
34e5a527 TP	271
755b888f VK	272	transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev);
	273	if (!transition_latency)
	274	transition_latency = CPUFREQ_ETERNAL;
	275
34e5a527 TP	276	policy->cpuinfo.transition_latency = transition_latency;
34e5a527 TP	277
95ceafd4 SG	278	return 0;
95ceafd4 SG	279
9a004428	280	out_free_cpufreq_table:
5d4879cd	281	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
045ee45c LS	282	out_free_priv:
045ee45c LS	283	kfree(priv);
2f0f609f	284	out_free_opp:
8f8d37b2	285	dev_pm_opp_of_cpumask_remove_table(policy->cpus);
050794aa	286	if (name)
dfbe4678	287	dev_pm_opp_put_regulators(opp_table);
dd02a3d9	288	out_put_clk:
ed4b053c	289	clk_put(cpu_clk);
d2f31f1d VK	290
	291	return ret;
	292	}
	293
bbcf0719	294	static int cpufreq_exit(struct cpufreq_policy *policy)
d2f31f1d VK	295	{
	296	struct private_data *priv = policy->driver_data;
	297
17ad13ba	298	cpufreq_cooling_unregister(priv->cdev);
d2f31f1d	299	dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
8f8d37b2	300	dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
050794aa	301	if (priv->reg_name)
dfbe4678	302	dev_pm_opp_put_regulators(priv->opp_table);
050794aa	303
d2f31f1d	304	clk_put(policy->clk);
d2f31f1d VK	305	kfree(priv);
	306
	307	return 0;
	308	}
	309
9a004428 VK	310	static void cpufreq_ready(struct cpufreq_policy *policy)
	311	{
	312	struct private_data *priv = policy->driver_data;
	313	struct device_node *np = of_node_get(priv->cpu_dev->of_node);
	314
	315	if (WARN_ON(!np))
	316	return;
	317
	318	/*
	319	* For now, just loading the cooling device;
	320	* thermal DT code takes care of matching them.
	321	*/
	322	if (of_find_property(np, "#cooling-cells", NULL)) {
f8fa8ae0 PA	323	u32 power_coefficient = 0;
	324
	325	of_property_read_u32(np, "dynamic-power-coefficient",
	326	&power_coefficient);
	327
	328	priv->cdev = of_cpufreq_power_cooling_register(np,
4d753aa7	329	policy, power_coefficient, NULL);
9a004428 VK	330	if (IS_ERR(priv->cdev)) {
	331	dev_err(priv->cpu_dev,
	332	"running cpufreq without cooling device: %ld\n",
	333	PTR_ERR(priv->cdev));
	334
	335	priv->cdev = NULL;
	336	}
	337	}
	338
	339	of_node_put(np);
	340	}
	341
bbcf0719	342	static struct cpufreq_driver dt_cpufreq_driver = {
d2f31f1d VK	343	.flags = CPUFREQ_STICKY \| CPUFREQ_NEED_INITIAL_FREQ_CHECK,
d2f31f1d VK	344	.verify = cpufreq_generic_frequency_table_verify,
bbcf0719	345	.target_index = set_target,
d2f31f1d	346	.get = cpufreq_generic_get,
bbcf0719 VK	347	.init = cpufreq_init,
bbcf0719 VK	348	.exit = cpufreq_exit,
9a004428	349	.ready = cpufreq_ready,
bbcf0719	350	.name = "cpufreq-dt",
21c36d35	351	.attr = cpufreq_dt_attr,
953ba9ff	352	.suspend = cpufreq_generic_suspend,
d2f31f1d VK	353	};
d2f31f1d VK	354
bbcf0719	355	static int dt_cpufreq_probe(struct platform_device *pdev)
d2f31f1d	356	{
297a6622	357	struct cpufreq_dt_platform_data *data = dev_get_platdata(&pdev->dev);
d2f31f1d VK	358	int ret;
	359
	360	/*
	361	* All per-cluster (CPUs sharing clock/voltages) initialization is done
	362	* from ->init(). In probe(), we just need to make sure that clk and
	363	* regulators are available. Else defer probe and retry.
	364	*
	365	* FIXME: Is checking this only for CPU0 sufficient ?
	366	*/
dd02a3d9	367	ret = resources_available();
d2f31f1d VK	368	if (ret)
	369	return ret;
	370
297a6622 VK	371	if (data && data->have_governor_per_policy)
	372	dt_cpufreq_driver.flags \|= CPUFREQ_HAVE_GOVERNOR_PER_POLICY;
	373
bbcf0719	374	ret = cpufreq_register_driver(&dt_cpufreq_driver);
d2f31f1d	375	if (ret)
dd02a3d9	376	dev_err(&pdev->dev, "failed register driver: %d\n", ret);
d2f31f1d	377
95ceafd4 SG	378	return ret;
95ceafd4 SG	379	}
5553f9e2	380
bbcf0719	381	static int dt_cpufreq_remove(struct platform_device *pdev)
5553f9e2	382	{
bbcf0719	383	cpufreq_unregister_driver(&dt_cpufreq_driver);
5553f9e2 SG	384	return 0;
	385	}
	386
bbcf0719	387	static struct platform_driver dt_cpufreq_platdrv = {
5553f9e2	388	.driver = {
bbcf0719	389	.name = "cpufreq-dt",
5553f9e2	390	},
bbcf0719 VK	391	.probe = dt_cpufreq_probe,
bbcf0719 VK	392	.remove = dt_cpufreq_remove,
5553f9e2	393	};
bbcf0719	394	module_platform_driver(dt_cpufreq_platdrv);
95ceafd4	395
07949bf9	396	MODULE_ALIAS("platform:cpufreq-dt");
748c8766	397	MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
95ceafd4	398	MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
bbcf0719	399	MODULE_DESCRIPTION("Generic cpufreq driver");
95ceafd4	400	MODULE_LICENSE("GPL");