[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 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)
{
	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 VK	30	struct private_data {
d2f31f1d VK	31	struct device *cpu_dev;
d2f31f1d	32	struct thermal_cooling_device *cdev;
050794aa	33	const char *reg_name;
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;
95ceafd4	45
78c3ba5d VK	46	return dev_pm_opp_set_rate(priv->cpu_dev,
78c3ba5d VK	47	policy->freq_table[index].frequency * 1000);
95ceafd4 SG	48	}
95ceafd4 SG	49
050794aa VK	50	/*
	51	* An earlier version of opp-v1 bindings used to name the regulator
	52	* "cpu0-supply", we still need to handle that for backwards compatibility.
	53	*/
df2c8ec2	54	static const char find_supply_name(struct device dev)
050794aa	55	{
df2c8ec2	56	struct device_node *np;
050794aa VK	57	struct property *pp;
050794aa VK	58	int cpu = dev->id;
df2c8ec2 VK	59	const char *name = NULL;
	60
	61	np = of_node_get(dev->of_node);
	62
	63	/* This must be valid for sure */
	64	if (WARN_ON(!np))
	65	return NULL;
050794aa VK	66
	67	/* Try "cpu0" for older DTs */
	68	if (!cpu) {
	69	pp = of_find_property(np, "cpu0-supply", NULL);
df2c8ec2 VK	70	if (pp) {
	71	name = "cpu0";
	72	goto node_put;
	73	}
050794aa VK	74	}
	75
	76	pp = of_find_property(np, "cpu-supply", NULL);
df2c8ec2 VK	77	if (pp) {
	78	name = "cpu";
	79	goto node_put;
	80	}
050794aa VK	81
050794aa VK	82	dev_dbg(dev, "no regulator for cpu%d\n", cpu);
df2c8ec2 VK	83	node_put:
	84	of_node_put(np);
	85	return name;
050794aa VK	86	}
050794aa VK	87
dd02a3d9	88	static int resources_available(void)
95ceafd4	89	{
d2f31f1d VK	90	struct device *cpu_dev;
	91	struct regulator *cpu_reg;
	92	struct clk *cpu_clk;
	93	int ret = 0;
dd02a3d9	94	const char *name;
95ceafd4	95
dd02a3d9	96	cpu_dev = get_cpu_device(0);
e1825b25	97	if (!cpu_dev) {
dd02a3d9	98	pr_err("failed to get cpu0 device\n");
e1825b25 SH	99	return -ENODEV;
e1825b25 SH	100	}
6754f556	101
dd02a3d9 VK	102	cpu_clk = clk_get(cpu_dev, NULL);
dd02a3d9 VK	103	ret = PTR_ERR_OR_ZERO(cpu_clk);
b331bc20	104	if (ret) {
fc31d6f5	105	/*
dd02a3d9 VK	106	* If cpu's clk node is present, but clock is not yet
dd02a3d9 VK	107	* registered, we should try defering probe.
fc31d6f5	108	*/
dd02a3d9 VK	109	if (ret == -EPROBE_DEFER)
	110	dev_dbg(cpu_dev, "clock not ready, retry\n");
	111	else
	112	dev_err(cpu_dev, "failed to get clock: %d\n", ret);
2d2c5e0e	113
dd02a3d9	114	return ret;
fc31d6f5 NM	115	}
fc31d6f5 NM	116
dd02a3d9 VK	117	clk_put(cpu_clk);
	118
	119	name = find_supply_name(cpu_dev);
	120	/* Platform doesn't require regulator */
	121	if (!name)
	122	return 0;
d2f31f1d	123
dd02a3d9 VK	124	cpu_reg = regulator_get_optional(cpu_dev, name);
	125	ret = PTR_ERR_OR_ZERO(cpu_reg);
	126	if (ret) {
48a8624b	127	/*
dd02a3d9 VK	128	* If cpu's regulator supply node is present, but regulator is
dd02a3d9 VK	129	* not yet registered, we should try defering probe.
48a8624b VK	130	*/
48a8624b VK	131	if (ret == -EPROBE_DEFER)
dd02a3d9	132	dev_dbg(cpu_dev, "cpu0 regulator not ready, retry\n");
48a8624b	133	else
dd02a3d9 VK	134	dev_dbg(cpu_dev, "no regulator for cpu0: %d\n", ret);
	135
	136	return ret;
d2f31f1d VK	137	}
d2f31f1d VK	138
dd02a3d9 VK	139	regulator_put(cpu_reg);
dd02a3d9 VK	140	return 0;
d2f31f1d VK	141	}
d2f31f1d VK	142
bbcf0719	143	static int cpufreq_init(struct cpufreq_policy *policy)
d2f31f1d VK	144	{
d2f31f1d VK	145	struct cpufreq_frequency_table *freq_table;
d2f31f1d VK	146	struct private_data *priv;
d2f31f1d VK	147	struct device *cpu_dev;
d2f31f1d	148	struct clk *cpu_clk;
953ba9ff	149	struct dev_pm_opp *suspend_opp;
d2f31f1d	150	unsigned int transition_latency;
1530b996	151	bool fallback = false;
050794aa	152	const char *name;
d2f31f1d VK	153	int ret;
d2f31f1d VK	154
dd02a3d9 VK	155	cpu_dev = get_cpu_device(policy->cpu);
	156	if (!cpu_dev) {
	157	pr_err("failed to get cpu%d device\n", policy->cpu);
	158	return -ENODEV;
	159	}
	160
	161	cpu_clk = clk_get(cpu_dev, NULL);
	162	if (IS_ERR(cpu_clk)) {
	163	ret = PTR_ERR(cpu_clk);
	164	dev_err(cpu_dev, "%s: failed to get clk: %d\n", __func__, ret);
d2f31f1d VK	165	return ret;
d2f31f1d VK	166	}
48a8624b	167
2e02d872	168	/* Get OPP-sharing information from "operating-points-v2" bindings */
8f8d37b2	169	ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, policy->cpus);
2e02d872	170	if (ret) {
1530b996 VK	171	if (ret != -ENOENT)
	172	goto out_put_clk;
	173
2e02d872 VK	174	/*
2e02d872 VK	175	* operating-points-v2 not supported, fallback to old method of
1530b996 VK	176	* finding shared-OPPs for backward compatibility if the
1530b996 VK	177	* platform hasn't set sharing CPUs.
2e02d872	178	*/
1530b996 VK	179	if (dev_pm_opp_get_sharing_cpus(cpu_dev, policy->cpus))
1530b996 VK	180	fallback = true;
2e02d872 VK	181	}
2e02d872 VK	182
050794aa VK	183	/*
	184	* OPP layer will be taking care of regulators now, but it needs to know
	185	* the name of the regulator first.
	186	*/
df2c8ec2	187	name = find_supply_name(cpu_dev);
050794aa VK	188	if (name) {
	189	ret = dev_pm_opp_set_regulator(cpu_dev, name);
	190	if (ret) {
	191	dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n",
	192	policy->cpu, ret);
dd02a3d9	193	goto out_put_clk;
050794aa VK	194	}
	195	}
	196
2e02d872 VK	197	/*
	198	* Initialize OPP tables for all policy->cpus. They will be shared by
	199	* all CPUs which have marked their CPUs shared with OPP bindings.
	200	*
	201	* For platforms not using operating-points-v2 bindings, we do this
	202	* before updating policy->cpus. Otherwise, we will end up creating
	203	* duplicate OPPs for policy->cpus.
	204	*
	205	* OPPs might be populated at runtime, don't check for error here
	206	*/
8f8d37b2	207	dev_pm_opp_of_cpumask_add_table(policy->cpus);
2e02d872	208
7d5d0c8b VK	209	/*
	210	* But we need OPP table to function so if it is not there let's
	211	* give platform code chance to provide it for us.
	212	*/
	213	ret = dev_pm_opp_get_opp_count(cpu_dev);
	214	if (ret <= 0) {
896d6a4c	215	dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n");
7d5d0c8b VK	216	ret = -EPROBE_DEFER;
	217	goto out_free_opp;
	218	}
	219
1530b996	220	if (fallback) {
eb96924a	221	cpumask_setall(policy->cpus);
2e02d872 VK	222
	223	/*
	224	* OPP tables are initialized only for policy->cpu, do it for
	225	* others as well.
	226	*/
8f8d37b2	227	ret = dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
8bc86284 VK	228	if (ret)
	229	dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
	230	__func__, ret);
2e02d872	231	}
95ceafd4	232
d2f31f1d VK	233	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	234	if (!priv) {
	235	ret = -ENOMEM;
2f0f609f	236	goto out_free_opp;
95ceafd4 SG	237	}
95ceafd4 SG	238
050794aa	239	priv->reg_name = name;
95ceafd4	240
045ee45c LS	241	ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
045ee45c LS	242	if (ret) {
896d6a4c	243	dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
045ee45c LS	244	goto out_free_priv;
	245	}
	246
d2f31f1d	247	priv->cpu_dev = cpu_dev;
d2f31f1d	248	policy->driver_data = priv;
d2f31f1d	249	policy->clk = cpu_clk;
953ba9ff BZ	250
	251	rcu_read_lock();
	252	suspend_opp = dev_pm_opp_get_suspend_opp(cpu_dev);
	253	if (suspend_opp)
	254	policy->suspend_freq = dev_pm_opp_get_freq(suspend_opp) / 1000;
	255	rcu_read_unlock();
	256
34e5a527 TP	257	ret = cpufreq_table_validate_and_show(policy, freq_table);
	258	if (ret) {
	259	dev_err(cpu_dev, "%s: invalid frequency table: %d\n", __func__,
	260	ret);
9a004428	261	goto out_free_cpufreq_table;
d15fa862 VK	262	}
	263
	264	/* Support turbo/boost mode */
	265	if (policy_has_boost_freq(policy)) {
	266	/* This gets disabled by core on driver unregister */
	267	ret = cpufreq_enable_boost_support();
	268	if (ret)
	269	goto out_free_cpufreq_table;
21c36d35	270	cpufreq_dt_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs;
34e5a527 TP	271	}
34e5a527 TP	272
755b888f VK	273	transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev);
	274	if (!transition_latency)
	275	transition_latency = CPUFREQ_ETERNAL;
	276
34e5a527 TP	277	policy->cpuinfo.transition_latency = transition_latency;
34e5a527 TP	278
95ceafd4 SG	279	return 0;
95ceafd4 SG	280
9a004428	281	out_free_cpufreq_table:
5d4879cd	282	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
045ee45c LS	283	out_free_priv:
045ee45c LS	284	kfree(priv);
2f0f609f	285	out_free_opp:
8f8d37b2	286	dev_pm_opp_of_cpumask_remove_table(policy->cpus);
050794aa VK	287	if (name)
050794aa VK	288	dev_pm_opp_put_regulator(cpu_dev);
dd02a3d9	289	out_put_clk:
ed4b053c	290	clk_put(cpu_clk);
d2f31f1d VK	291
	292	return ret;
	293	}
	294
bbcf0719	295	static int cpufreq_exit(struct cpufreq_policy *policy)
d2f31f1d VK	296	{
	297	struct private_data *priv = policy->driver_data;
	298
17ad13ba	299	cpufreq_cooling_unregister(priv->cdev);
d2f31f1d	300	dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
8f8d37b2	301	dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
050794aa VK	302	if (priv->reg_name)
	303	dev_pm_opp_put_regulator(priv->cpu_dev);
	304
d2f31f1d	305	clk_put(policy->clk);
d2f31f1d VK	306	kfree(priv);
	307
	308	return 0;
	309	}
	310
9a004428 VK	311	static void cpufreq_ready(struct cpufreq_policy *policy)
	312	{
	313	struct private_data *priv = policy->driver_data;
	314	struct device_node *np = of_node_get(priv->cpu_dev->of_node);
	315
	316	if (WARN_ON(!np))
	317	return;
	318
	319	/*
	320	* For now, just loading the cooling device;
	321	* thermal DT code takes care of matching them.
	322	*/
	323	if (of_find_property(np, "#cooling-cells", NULL)) {
f8fa8ae0 PA	324	u32 power_coefficient = 0;
	325
	326	of_property_read_u32(np, "dynamic-power-coefficient",
	327	&power_coefficient);
	328
	329	priv->cdev = of_cpufreq_power_cooling_register(np,
	330	policy->related_cpus, power_coefficient, NULL);
9a004428 VK	331	if (IS_ERR(priv->cdev)) {
	332	dev_err(priv->cpu_dev,
	333	"running cpufreq without cooling device: %ld\n",
	334	PTR_ERR(priv->cdev));
	335
	336	priv->cdev = NULL;
	337	}
	338	}
	339
	340	of_node_put(np);
	341	}
	342
bbcf0719	343	static struct cpufreq_driver dt_cpufreq_driver = {
d2f31f1d VK	344	.flags = CPUFREQ_STICKY \| CPUFREQ_NEED_INITIAL_FREQ_CHECK,
d2f31f1d VK	345	.verify = cpufreq_generic_frequency_table_verify,
bbcf0719	346	.target_index = set_target,
d2f31f1d	347	.get = cpufreq_generic_get,
bbcf0719 VK	348	.init = cpufreq_init,
bbcf0719 VK	349	.exit = cpufreq_exit,
9a004428	350	.ready = cpufreq_ready,
bbcf0719	351	.name = "cpufreq-dt",
21c36d35	352	.attr = cpufreq_dt_attr,
953ba9ff	353	.suspend = cpufreq_generic_suspend,
d2f31f1d VK	354	};
d2f31f1d VK	355
bbcf0719	356	static int dt_cpufreq_probe(struct platform_device *pdev)
d2f31f1d	357	{
297a6622	358	struct cpufreq_dt_platform_data *data = dev_get_platdata(&pdev->dev);
d2f31f1d VK	359	int ret;
	360
	361	/*
	362	* All per-cluster (CPUs sharing clock/voltages) initialization is done
	363	* from ->init(). In probe(), we just need to make sure that clk and
	364	* regulators are available. Else defer probe and retry.
	365	*
	366	* FIXME: Is checking this only for CPU0 sufficient ?
	367	*/
dd02a3d9	368	ret = resources_available();
d2f31f1d VK	369	if (ret)
	370	return ret;
	371
297a6622 VK	372	if (data && data->have_governor_per_policy)
	373	dt_cpufreq_driver.flags \|= CPUFREQ_HAVE_GOVERNOR_PER_POLICY;
	374
bbcf0719	375	ret = cpufreq_register_driver(&dt_cpufreq_driver);
d2f31f1d	376	if (ret)
dd02a3d9	377	dev_err(&pdev->dev, "failed register driver: %d\n", ret);
d2f31f1d	378
95ceafd4 SG	379	return ret;
95ceafd4 SG	380	}
5553f9e2	381
bbcf0719	382	static int dt_cpufreq_remove(struct platform_device *pdev)
5553f9e2	383	{
bbcf0719	384	cpufreq_unregister_driver(&dt_cpufreq_driver);
5553f9e2 SG	385	return 0;
	386	}
	387
bbcf0719	388	static struct platform_driver dt_cpufreq_platdrv = {
5553f9e2	389	.driver = {
bbcf0719	390	.name = "cpufreq-dt",
5553f9e2	391	},
bbcf0719 VK	392	.probe = dt_cpufreq_probe,
bbcf0719 VK	393	.remove = dt_cpufreq_remove,
5553f9e2	394	};
bbcf0719	395	module_platform_driver(dt_cpufreq_platdrv);
95ceafd4	396
07949bf9	397	MODULE_ALIAS("platform:cpufreq-dt");
748c8766	398	MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
95ceafd4	399	MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
bbcf0719	400	MODULE_DESCRIPTION("Generic cpufreq driver");
95ceafd4	401	MODULE_LICENSE("GPL");