[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>
 *
 * The OPP code in function set_target() is reused from
 * drivers/cpufreq/omap-cpufreq.c
 *
 * 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/cpufreq-dt.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 opp_v1 = 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) {
		/*
		 * operating-points-v2 not supported, fallback to old method of
		 * finding shared-OPPs for backward compatibility.
		 */
		if (ret == -ENOENT)
			opp_v1 = true;
		else
			goto out_put_clk;
	}

	/*
	 * 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 (opp_v1) {
		struct cpufreq_dt_platform_data *pd = cpufreq_get_driver_data();

		if (!pd || !pd->independent_clocks)
			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	*
bbcf0719	7	* The OPP code in function set_target() is reused from
95ceafd4 SG	8	* drivers/cpufreq/omap-cpufreq.c
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*/
	14
	15	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	16
	17	#include <linux/clk.h>
e1825b25	18	#include <linux/cpu.h>
77cff592	19	#include <linux/cpu_cooling.h>
95ceafd4	20	#include <linux/cpufreq.h>
34e5a527	21	#include <linux/cpufreq-dt.h>
77cff592	22	#include <linux/cpumask.h>
95ceafd4 SG	23	#include <linux/err.h>
	24	#include <linux/module.h>
	25	#include <linux/of.h>
e4db1c74	26	#include <linux/pm_opp.h>
5553f9e2	27	#include <linux/platform_device.h>
95ceafd4 SG	28	#include <linux/regulator/consumer.h>
95ceafd4 SG	29	#include <linux/slab.h>
77cff592	30	#include <linux/thermal.h>
95ceafd4	31
d2f31f1d VK	32	struct private_data {
d2f31f1d VK	33	struct device *cpu_dev;
d2f31f1d	34	struct thermal_cooling_device *cdev;
050794aa	35	const char *reg_name;
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;
95ceafd4	47
78c3ba5d VK	48	return dev_pm_opp_set_rate(priv->cpu_dev,
78c3ba5d VK	49	policy->freq_table[index].frequency * 1000);
95ceafd4 SG	50	}
95ceafd4 SG	51
050794aa VK	52	/*
	53	* An earlier version of opp-v1 bindings used to name the regulator
	54	* "cpu0-supply", we still need to handle that for backwards compatibility.
	55	*/
df2c8ec2	56	static const char find_supply_name(struct device dev)
050794aa	57	{
df2c8ec2	58	struct device_node *np;
050794aa VK	59	struct property *pp;
050794aa VK	60	int cpu = dev->id;
df2c8ec2 VK	61	const char *name = NULL;
	62
	63	np = of_node_get(dev->of_node);
	64
	65	/* This must be valid for sure */
	66	if (WARN_ON(!np))
	67	return NULL;
050794aa VK	68
	69	/* Try "cpu0" for older DTs */
	70	if (!cpu) {
	71	pp = of_find_property(np, "cpu0-supply", NULL);
df2c8ec2 VK	72	if (pp) {
	73	name = "cpu0";
	74	goto node_put;
	75	}
050794aa VK	76	}
	77
	78	pp = of_find_property(np, "cpu-supply", NULL);
df2c8ec2 VK	79	if (pp) {
	80	name = "cpu";
	81	goto node_put;
	82	}
050794aa VK	83
050794aa VK	84	dev_dbg(dev, "no regulator for cpu%d\n", cpu);
df2c8ec2 VK	85	node_put:
	86	of_node_put(np);
	87	return name;
050794aa VK	88	}
050794aa VK	89
dd02a3d9	90	static int resources_available(void)
95ceafd4	91	{
d2f31f1d VK	92	struct device *cpu_dev;
	93	struct regulator *cpu_reg;
	94	struct clk *cpu_clk;
	95	int ret = 0;
dd02a3d9	96	const char *name;
95ceafd4	97
dd02a3d9	98	cpu_dev = get_cpu_device(0);
e1825b25	99	if (!cpu_dev) {
dd02a3d9	100	pr_err("failed to get cpu0 device\n");
e1825b25 SK	101	return -ENODEV;
e1825b25 SK	102	}
6754f556	103
dd02a3d9 VK	104	cpu_clk = clk_get(cpu_dev, NULL);
dd02a3d9 VK	105	ret = PTR_ERR_OR_ZERO(cpu_clk);
b331bc20	106	if (ret) {
fc31d6f5	107	/*
dd02a3d9 VK	108	* If cpu's clk node is present, but clock is not yet
dd02a3d9 VK	109	* registered, we should try defering probe.
fc31d6f5	110	*/
dd02a3d9 VK	111	if (ret == -EPROBE_DEFER)
	112	dev_dbg(cpu_dev, "clock not ready, retry\n");
	113	else
	114	dev_err(cpu_dev, "failed to get clock: %d\n", ret);
2d2c5e0e	115
dd02a3d9	116	return ret;
fc31d6f5 NM	117	}
fc31d6f5 NM	118
dd02a3d9 VK	119	clk_put(cpu_clk);
	120
	121	name = find_supply_name(cpu_dev);
	122	/* Platform doesn't require regulator */
	123	if (!name)
	124	return 0;
d2f31f1d	125
dd02a3d9 VK	126	cpu_reg = regulator_get_optional(cpu_dev, name);
	127	ret = PTR_ERR_OR_ZERO(cpu_reg);
	128	if (ret) {
48a8624b	129	/*
dd02a3d9 VK	130	* If cpu's regulator supply node is present, but regulator is
dd02a3d9 VK	131	* not yet registered, we should try defering probe.
48a8624b VK	132	*/
48a8624b VK	133	if (ret == -EPROBE_DEFER)
dd02a3d9	134	dev_dbg(cpu_dev, "cpu0 regulator not ready, retry\n");
48a8624b	135	else
dd02a3d9 VK	136	dev_dbg(cpu_dev, "no regulator for cpu0: %d\n", ret);
	137
	138	return ret;
d2f31f1d VK	139	}
d2f31f1d VK	140
dd02a3d9 VK	141	regulator_put(cpu_reg);
dd02a3d9 VK	142	return 0;
d2f31f1d VK	143	}
d2f31f1d VK	144
bbcf0719	145	static int cpufreq_init(struct cpufreq_policy *policy)
d2f31f1d VK	146	{
d2f31f1d VK	147	struct cpufreq_frequency_table *freq_table;
d2f31f1d VK	148	struct private_data *priv;
d2f31f1d VK	149	struct device *cpu_dev;
d2f31f1d	150	struct clk *cpu_clk;
953ba9ff	151	struct dev_pm_opp *suspend_opp;
d2f31f1d	152	unsigned int transition_latency;
457e99e6	153	bool opp_v1 = false;
050794aa	154	const char *name;
d2f31f1d VK	155	int ret;
d2f31f1d VK	156
dd02a3d9 VK	157	cpu_dev = get_cpu_device(policy->cpu);
	158	if (!cpu_dev) {
	159	pr_err("failed to get cpu%d device\n", policy->cpu);
	160	return -ENODEV;
	161	}
	162
	163	cpu_clk = clk_get(cpu_dev, NULL);
	164	if (IS_ERR(cpu_clk)) {
	165	ret = PTR_ERR(cpu_clk);
	166	dev_err(cpu_dev, "%s: failed to get clk: %d\n", __func__, ret);
d2f31f1d VK	167	return ret;
d2f31f1d VK	168	}
48a8624b	169
2e02d872	170	/* Get OPP-sharing information from "operating-points-v2" bindings */
8f8d37b2	171	ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, policy->cpus);
2e02d872 VK	172	if (ret) {
	173	/*
	174	* operating-points-v2 not supported, fallback to old method of
	175	* finding shared-OPPs for backward compatibility.
	176	*/
	177	if (ret == -ENOENT)
457e99e6	178	opp_v1 = true;
2e02d872	179	else
dd02a3d9	180	goto out_put_clk;
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
457e99e6	220	if (opp_v1) {
2e02d872 VK	221	struct cpufreq_dt_platform_data *pd = cpufreq_get_driver_data();
	222
	223	if (!pd \|\| !pd->independent_clocks)
	224	cpumask_setall(policy->cpus);
	225
	226	/*
	227	* OPP tables are initialized only for policy->cpu, do it for
	228	* others as well.
	229	*/
8f8d37b2	230	ret = dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
8bc86284 VK	231	if (ret)
	232	dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
	233	__func__, ret);
2e02d872	234	}
95ceafd4	235
d2f31f1d VK	236	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	237	if (!priv) {
	238	ret = -ENOMEM;
2f0f609f	239	goto out_free_opp;
95ceafd4 SG	240	}
95ceafd4 SG	241
050794aa	242	priv->reg_name = name;
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 BZ	253
	254	rcu_read_lock();
	255	suspend_opp = dev_pm_opp_get_suspend_opp(cpu_dev);
	256	if (suspend_opp)
	257	policy->suspend_freq = dev_pm_opp_get_freq(suspend_opp) / 1000;
	258	rcu_read_unlock();
	259
34e5a527 TP	260	ret = cpufreq_table_validate_and_show(policy, freq_table);
	261	if (ret) {
	262	dev_err(cpu_dev, "%s: invalid frequency table: %d\n", __func__,
	263	ret);
9a004428	264	goto out_free_cpufreq_table;
d15fa862 VK	265	}
	266
	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 TP	280	policy->cpuinfo.transition_latency = transition_latency;
34e5a527 TP	281
95ceafd4 SG	282	return 0;
95ceafd4 SG	283
9a004428	284	out_free_cpufreq_table:
5d4879cd	285	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
045ee45c LS	286	out_free_priv:
045ee45c LS	287	kfree(priv);
2f0f609f	288	out_free_opp:
8f8d37b2	289	dev_pm_opp_of_cpumask_remove_table(policy->cpus);
050794aa VK	290	if (name)
050794aa VK	291	dev_pm_opp_put_regulator(cpu_dev);
dd02a3d9	292	out_put_clk:
ed4b053c	293	clk_put(cpu_clk);
d2f31f1d VK	294
	295	return ret;
	296	}
	297
bbcf0719	298	static int cpufreq_exit(struct cpufreq_policy *policy)
d2f31f1d VK	299	{
	300	struct private_data *priv = policy->driver_data;
	301
17ad13ba	302	cpufreq_cooling_unregister(priv->cdev);
d2f31f1d	303	dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
8f8d37b2	304	dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
050794aa VK	305	if (priv->reg_name)
	306	dev_pm_opp_put_regulator(priv->cpu_dev);
	307
d2f31f1d	308	clk_put(policy->clk);
d2f31f1d VK	309	kfree(priv);
	310
	311	return 0;
	312	}
	313
9a004428 VK	314	static void cpufreq_ready(struct cpufreq_policy *policy)
	315	{
	316	struct private_data *priv = policy->driver_data;
	317	struct device_node *np = of_node_get(priv->cpu_dev->of_node);
	318
	319	if (WARN_ON(!np))
	320	return;
	321
	322	/*
	323	* For now, just loading the cooling device;
	324	* thermal DT code takes care of matching them.
	325	*/
	326	if (of_find_property(np, "#cooling-cells", NULL)) {
f8fa8ae0 PA	327	u32 power_coefficient = 0;
	328
	329	of_property_read_u32(np, "dynamic-power-coefficient",
	330	&power_coefficient);
	331
	332	priv->cdev = of_cpufreq_power_cooling_register(np,
	333	policy->related_cpus, power_coefficient, NULL);
9a004428 VK	334	if (IS_ERR(priv->cdev)) {
	335	dev_err(priv->cpu_dev,
	336	"running cpufreq without cooling device: %ld\n",
	337	PTR_ERR(priv->cdev));
	338
	339	priv->cdev = NULL;
	340	}
	341	}
	342
	343	of_node_put(np);
	344	}
	345
bbcf0719	346	static struct cpufreq_driver dt_cpufreq_driver = {
d2f31f1d VK	347	.flags = CPUFREQ_STICKY \| CPUFREQ_NEED_INITIAL_FREQ_CHECK,
d2f31f1d VK	348	.verify = cpufreq_generic_frequency_table_verify,
bbcf0719	349	.target_index = set_target,
d2f31f1d	350	.get = cpufreq_generic_get,
bbcf0719 VK	351	.init = cpufreq_init,
bbcf0719 VK	352	.exit = cpufreq_exit,
9a004428	353	.ready = cpufreq_ready,
bbcf0719	354	.name = "cpufreq-dt",
21c36d35	355	.attr = cpufreq_dt_attr,
953ba9ff	356	.suspend = cpufreq_generic_suspend,
d2f31f1d VK	357	};
d2f31f1d VK	358
bbcf0719	359	static int dt_cpufreq_probe(struct platform_device *pdev)
d2f31f1d	360	{
d2f31f1d VK	361	int ret;
	362
	363	/*
	364	* All per-cluster (CPUs sharing clock/voltages) initialization is done
	365	* from ->init(). In probe(), we just need to make sure that clk and
	366	* regulators are available. Else defer probe and retry.
	367	*
	368	* FIXME: Is checking this only for CPU0 sufficient ?
	369	*/
dd02a3d9	370	ret = resources_available();
d2f31f1d VK	371	if (ret)
	372	return ret;
	373
34e5a527 TP	374	dt_cpufreq_driver.driver_data = dev_get_platdata(&pdev->dev);
34e5a527 TP	375
bbcf0719	376	ret = cpufreq_register_driver(&dt_cpufreq_driver);
d2f31f1d	377	if (ret)
dd02a3d9	378	dev_err(&pdev->dev, "failed register driver: %d\n", ret);
d2f31f1d	379
95ceafd4 SG	380	return ret;
95ceafd4 SG	381	}
5553f9e2	382
bbcf0719	383	static int dt_cpufreq_remove(struct platform_device *pdev)
5553f9e2	384	{
bbcf0719	385	cpufreq_unregister_driver(&dt_cpufreq_driver);
5553f9e2 SG	386	return 0;
	387	}
	388
bbcf0719	389	static struct platform_driver dt_cpufreq_platdrv = {
5553f9e2	390	.driver = {
bbcf0719	391	.name = "cpufreq-dt",
5553f9e2	392	},
bbcf0719 VK	393	.probe = dt_cpufreq_probe,
bbcf0719 VK	394	.remove = dt_cpufreq_remove,
5553f9e2	395	};
bbcf0719	396	module_platform_driver(dt_cpufreq_platdrv);
95ceafd4	397
07949bf9	398	MODULE_ALIAS("platform:cpufreq-dt");
748c8766	399	MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
95ceafd4	400	MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
bbcf0719	401	MODULE_DESCRIPTION("Generic cpufreq driver");
95ceafd4	402	MODULE_LICENSE("GPL");