[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>

struct private_data {
	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 private_data *priv;
	struct device *cpu_dev;
	struct clk *cpu_clk;
	struct dev_pm_opp *suspend_opp;
	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) {
		ret = dev_pm_opp_set_regulator(cpu_dev, name);
		if (ret) {
			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;

	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;

	rcu_read_lock();
	suspend_opp = dev_pm_opp_get_suspend_opp(cpu_dev);
	if (suspend_opp)
		policy->suspend_freq = dev_pm_opp_get_freq(suspend_opp) / 1000;
	rcu_read_unlock();

	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_regulator(cpu_dev);
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_regulator(priv->cpu_dev);

	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->related_cpus, 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)
{
	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;

	dt_cpufreq_driver.driver_data = dev_get_platdata(&pdev->dev);

	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
d2f31f1d VK	28	struct private_data {
d2f31f1d VK	29	struct device *cpu_dev;
d2f31f1d	30	struct thermal_cooling_device *cdev;
050794aa	31	const char *reg_name;
d2f31f1d	32	};
95ceafd4	33
21c36d35 BZ	34	static struct freq_attr *cpufreq_dt_attr[] = {
	35	&cpufreq_freq_attr_scaling_available_freqs,
	36	NULL, /* Extra space for boost-attr if required */
	37	NULL,
	38	};
	39
bbcf0719	40	static int set_target(struct cpufreq_policy *policy, unsigned int index)
95ceafd4	41	{
d2f31f1d	42	struct private_data *priv = policy->driver_data;
95ceafd4	43
78c3ba5d VK	44	return dev_pm_opp_set_rate(priv->cpu_dev,
78c3ba5d VK	45	policy->freq_table[index].frequency * 1000);
95ceafd4 SG	46	}
95ceafd4 SG	47
050794aa VK	48	/*
	49	* An earlier version of opp-v1 bindings used to name the regulator
	50	* "cpu0-supply", we still need to handle that for backwards compatibility.
	51	*/
df2c8ec2	52	static const char find_supply_name(struct device dev)
050794aa	53	{
df2c8ec2	54	struct device_node *np;
050794aa VK	55	struct property *pp;
050794aa VK	56	int cpu = dev->id;
df2c8ec2 VK	57	const char *name = NULL;
	58
	59	np = of_node_get(dev->of_node);
	60
	61	/* This must be valid for sure */
	62	if (WARN_ON(!np))
	63	return NULL;
050794aa VK	64
	65	/* Try "cpu0" for older DTs */
	66	if (!cpu) {
	67	pp = of_find_property(np, "cpu0-supply", NULL);
df2c8ec2 VK	68	if (pp) {
	69	name = "cpu0";
	70	goto node_put;
	71	}
050794aa VK	72	}
	73
	74	pp = of_find_property(np, "cpu-supply", NULL);
df2c8ec2 VK	75	if (pp) {
	76	name = "cpu";
	77	goto node_put;
	78	}
050794aa VK	79
050794aa VK	80	dev_dbg(dev, "no regulator for cpu%d\n", cpu);
df2c8ec2 VK	81	node_put:
	82	of_node_put(np);
	83	return name;
050794aa VK	84	}
050794aa VK	85
dd02a3d9	86	static int resources_available(void)
95ceafd4	87	{
d2f31f1d VK	88	struct device *cpu_dev;
	89	struct regulator *cpu_reg;
	90	struct clk *cpu_clk;
	91	int ret = 0;
dd02a3d9	92	const char *name;
95ceafd4	93
dd02a3d9	94	cpu_dev = get_cpu_device(0);
e1825b25	95	if (!cpu_dev) {
dd02a3d9	96	pr_err("failed to get cpu0 device\n");
e1825b25 SK	97	return -ENODEV;
e1825b25 SK	98	}
6754f556	99
dd02a3d9 VK	100	cpu_clk = clk_get(cpu_dev, NULL);
dd02a3d9 VK	101	ret = PTR_ERR_OR_ZERO(cpu_clk);
b331bc20	102	if (ret) {
fc31d6f5	103	/*
dd02a3d9 VK	104	* If cpu's clk node is present, but clock is not yet
dd02a3d9 VK	105	* registered, we should try defering probe.
fc31d6f5	106	*/
dd02a3d9 VK	107	if (ret == -EPROBE_DEFER)
	108	dev_dbg(cpu_dev, "clock not ready, retry\n");
	109	else
	110	dev_err(cpu_dev, "failed to get clock: %d\n", ret);
2d2c5e0e	111
dd02a3d9	112	return ret;
fc31d6f5 NM	113	}
fc31d6f5 NM	114
dd02a3d9 VK	115	clk_put(cpu_clk);
	116
	117	name = find_supply_name(cpu_dev);
	118	/* Platform doesn't require regulator */
	119	if (!name)
	120	return 0;
d2f31f1d	121
dd02a3d9 VK	122	cpu_reg = regulator_get_optional(cpu_dev, name);
	123	ret = PTR_ERR_OR_ZERO(cpu_reg);
	124	if (ret) {
48a8624b	125	/*
dd02a3d9 VK	126	* If cpu's regulator supply node is present, but regulator is
dd02a3d9 VK	127	* not yet registered, we should try defering probe.
48a8624b VK	128	*/
48a8624b VK	129	if (ret == -EPROBE_DEFER)
dd02a3d9	130	dev_dbg(cpu_dev, "cpu0 regulator not ready, retry\n");
48a8624b	131	else
dd02a3d9 VK	132	dev_dbg(cpu_dev, "no regulator for cpu0: %d\n", ret);
	133
	134	return ret;
d2f31f1d VK	135	}
d2f31f1d VK	136
dd02a3d9 VK	137	regulator_put(cpu_reg);
dd02a3d9 VK	138	return 0;
d2f31f1d VK	139	}
d2f31f1d VK	140
bbcf0719	141	static int cpufreq_init(struct cpufreq_policy *policy)
d2f31f1d VK	142	{
d2f31f1d VK	143	struct cpufreq_frequency_table *freq_table;
d2f31f1d VK	144	struct private_data *priv;
d2f31f1d VK	145	struct device *cpu_dev;
d2f31f1d	146	struct clk *cpu_clk;
953ba9ff	147	struct dev_pm_opp *suspend_opp;
d2f31f1d	148	unsigned int transition_latency;
1530b996	149	bool fallback = false;
050794aa	150	const char *name;
d2f31f1d VK	151	int ret;
d2f31f1d VK	152
dd02a3d9 VK	153	cpu_dev = get_cpu_device(policy->cpu);
	154	if (!cpu_dev) {
	155	pr_err("failed to get cpu%d device\n", policy->cpu);
	156	return -ENODEV;
	157	}
	158
	159	cpu_clk = clk_get(cpu_dev, NULL);
	160	if (IS_ERR(cpu_clk)) {
	161	ret = PTR_ERR(cpu_clk);
	162	dev_err(cpu_dev, "%s: failed to get clk: %d\n", __func__, ret);
d2f31f1d VK	163	return ret;
d2f31f1d VK	164	}
48a8624b	165
2e02d872	166	/* Get OPP-sharing information from "operating-points-v2" bindings */
8f8d37b2	167	ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, policy->cpus);
2e02d872	168	if (ret) {
1530b996 VK	169	if (ret != -ENOENT)
	170	goto out_put_clk;
	171
2e02d872 VK	172	/*
2e02d872 VK	173	* operating-points-v2 not supported, fallback to old method of
1530b996 VK	174	* finding shared-OPPs for backward compatibility if the
1530b996 VK	175	* platform hasn't set sharing CPUs.
2e02d872	176	*/
1530b996 VK	177	if (dev_pm_opp_get_sharing_cpus(cpu_dev, policy->cpus))
1530b996 VK	178	fallback = true;
2e02d872 VK	179	}
2e02d872 VK	180
050794aa VK	181	/*
	182	* OPP layer will be taking care of regulators now, but it needs to know
	183	* the name of the regulator first.
	184	*/
df2c8ec2	185	name = find_supply_name(cpu_dev);
050794aa VK	186	if (name) {
	187	ret = dev_pm_opp_set_regulator(cpu_dev, name);
	188	if (ret) {
	189	dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n",
	190	policy->cpu, ret);
dd02a3d9	191	goto out_put_clk;
050794aa VK	192	}
	193	}
	194
2e02d872 VK	195	/*
	196	* Initialize OPP tables for all policy->cpus. They will be shared by
	197	* all CPUs which have marked their CPUs shared with OPP bindings.
	198	*
	199	* For platforms not using operating-points-v2 bindings, we do this
	200	* before updating policy->cpus. Otherwise, we will end up creating
	201	* duplicate OPPs for policy->cpus.
	202	*
	203	* OPPs might be populated at runtime, don't check for error here
	204	*/
8f8d37b2	205	dev_pm_opp_of_cpumask_add_table(policy->cpus);
2e02d872	206
7d5d0c8b VK	207	/*
	208	* But we need OPP table to function so if it is not there let's
	209	* give platform code chance to provide it for us.
	210	*/
	211	ret = dev_pm_opp_get_opp_count(cpu_dev);
	212	if (ret <= 0) {
896d6a4c	213	dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n");
7d5d0c8b VK	214	ret = -EPROBE_DEFER;
	215	goto out_free_opp;
	216	}
	217
1530b996	218	if (fallback) {
eb96924a	219	cpumask_setall(policy->cpus);
2e02d872 VK	220
	221	/*
	222	* OPP tables are initialized only for policy->cpu, do it for
	223	* others as well.
	224	*/
8f8d37b2	225	ret = dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
8bc86284 VK	226	if (ret)
	227	dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
	228	__func__, ret);
2e02d872	229	}
95ceafd4	230
d2f31f1d VK	231	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	232	if (!priv) {
	233	ret = -ENOMEM;
2f0f609f	234	goto out_free_opp;
95ceafd4 SG	235	}
95ceafd4 SG	236
050794aa	237	priv->reg_name = name;
95ceafd4	238
045ee45c LS	239	ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
045ee45c LS	240	if (ret) {
896d6a4c	241	dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
045ee45c LS	242	goto out_free_priv;
	243	}
	244
d2f31f1d	245	priv->cpu_dev = cpu_dev;
d2f31f1d	246	policy->driver_data = priv;
d2f31f1d	247	policy->clk = cpu_clk;
953ba9ff BZ	248
	249	rcu_read_lock();
	250	suspend_opp = dev_pm_opp_get_suspend_opp(cpu_dev);
	251	if (suspend_opp)
	252	policy->suspend_freq = dev_pm_opp_get_freq(suspend_opp) / 1000;
	253	rcu_read_unlock();
	254
34e5a527 TP	255	ret = cpufreq_table_validate_and_show(policy, freq_table);
	256	if (ret) {
	257	dev_err(cpu_dev, "%s: invalid frequency table: %d\n", __func__,
	258	ret);
9a004428	259	goto out_free_cpufreq_table;
d15fa862 VK	260	}
	261
	262	/* Support turbo/boost mode */
	263	if (policy_has_boost_freq(policy)) {
	264	/* This gets disabled by core on driver unregister */
	265	ret = cpufreq_enable_boost_support();
	266	if (ret)
	267	goto out_free_cpufreq_table;
21c36d35	268	cpufreq_dt_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs;
34e5a527 TP	269	}
34e5a527 TP	270
755b888f VK	271	transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev);
	272	if (!transition_latency)
	273	transition_latency = CPUFREQ_ETERNAL;
	274
34e5a527 TP	275	policy->cpuinfo.transition_latency = transition_latency;
34e5a527 TP	276
95ceafd4 SG	277	return 0;
95ceafd4 SG	278
9a004428	279	out_free_cpufreq_table:
5d4879cd	280	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
045ee45c LS	281	out_free_priv:
045ee45c LS	282	kfree(priv);
2f0f609f	283	out_free_opp:
8f8d37b2	284	dev_pm_opp_of_cpumask_remove_table(policy->cpus);
050794aa VK	285	if (name)
050794aa VK	286	dev_pm_opp_put_regulator(cpu_dev);
dd02a3d9	287	out_put_clk:
ed4b053c	288	clk_put(cpu_clk);
d2f31f1d VK	289
	290	return ret;
	291	}
	292
bbcf0719	293	static int cpufreq_exit(struct cpufreq_policy *policy)
d2f31f1d VK	294	{
	295	struct private_data *priv = policy->driver_data;
	296
17ad13ba	297	cpufreq_cooling_unregister(priv->cdev);
d2f31f1d	298	dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
8f8d37b2	299	dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
050794aa VK	300	if (priv->reg_name)
	301	dev_pm_opp_put_regulator(priv->cpu_dev);
	302
d2f31f1d	303	clk_put(policy->clk);
d2f31f1d VK	304	kfree(priv);
	305
	306	return 0;
	307	}
	308
9a004428 VK	309	static void cpufreq_ready(struct cpufreq_policy *policy)
	310	{
	311	struct private_data *priv = policy->driver_data;
	312	struct device_node *np = of_node_get(priv->cpu_dev->of_node);
	313
	314	if (WARN_ON(!np))
	315	return;
	316
	317	/*
	318	* For now, just loading the cooling device;
	319	* thermal DT code takes care of matching them.
	320	*/
	321	if (of_find_property(np, "#cooling-cells", NULL)) {
f8fa8ae0 PA	322	u32 power_coefficient = 0;
	323
	324	of_property_read_u32(np, "dynamic-power-coefficient",
	325	&power_coefficient);
	326
	327	priv->cdev = of_cpufreq_power_cooling_register(np,
	328	policy->related_cpus, power_coefficient, NULL);
9a004428 VK	329	if (IS_ERR(priv->cdev)) {
	330	dev_err(priv->cpu_dev,
	331	"running cpufreq without cooling device: %ld\n",
	332	PTR_ERR(priv->cdev));
	333
	334	priv->cdev = NULL;
	335	}
	336	}
	337
	338	of_node_put(np);
	339	}
	340
bbcf0719	341	static struct cpufreq_driver dt_cpufreq_driver = {
d2f31f1d VK	342	.flags = CPUFREQ_STICKY \| CPUFREQ_NEED_INITIAL_FREQ_CHECK,
d2f31f1d VK	343	.verify = cpufreq_generic_frequency_table_verify,
bbcf0719	344	.target_index = set_target,
d2f31f1d	345	.get = cpufreq_generic_get,
bbcf0719 VK	346	.init = cpufreq_init,
bbcf0719 VK	347	.exit = cpufreq_exit,
9a004428	348	.ready = cpufreq_ready,
bbcf0719	349	.name = "cpufreq-dt",
21c36d35	350	.attr = cpufreq_dt_attr,
953ba9ff	351	.suspend = cpufreq_generic_suspend,
d2f31f1d VK	352	};
d2f31f1d VK	353
bbcf0719	354	static int dt_cpufreq_probe(struct platform_device *pdev)
d2f31f1d	355	{
d2f31f1d VK	356	int ret;
	357
	358	/*
	359	* All per-cluster (CPUs sharing clock/voltages) initialization is done
	360	* from ->init(). In probe(), we just need to make sure that clk and
	361	* regulators are available. Else defer probe and retry.
	362	*
	363	* FIXME: Is checking this only for CPU0 sufficient ?
	364	*/
dd02a3d9	365	ret = resources_available();
d2f31f1d VK	366	if (ret)
	367	return ret;
	368
34e5a527 TP	369	dt_cpufreq_driver.driver_data = dev_get_platdata(&pdev->dev);
34e5a527 TP	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");