[linux-2.6-block.git] / drivers / cpufreq / dbx500-cpufreq.c

/*
 * Copyright (C) STMicroelectronics 2009
 * Copyright (C) ST-Ericsson SA 2010-2012
 *
 * License Terms: GNU General Public License v2
 * Author: Sundar Iyer <sundar.iyer@stericsson.com>
 * Author: Martin Persson <martin.persson@stericsson.com>
 * Author: Jonas Aaberg <jonas.aberg@stericsson.com>
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/cpufreq.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/clk.h>

static struct cpufreq_frequency_table *freq_table;
static struct clk *armss_clk;

static int dbx500_cpufreq_target(struct cpufreq_policy *policy,
				unsigned int index)
{
	/* update armss clk frequency */
	return clk_set_rate(armss_clk, freq_table[index].frequency * 1000);
}

static unsigned int dbx500_cpufreq_getspeed(unsigned int cpu)
{
	int i = 0;
	unsigned long freq = clk_get_rate(armss_clk) / 1000;

	/* The value is rounded to closest frequency in the defined table. */
	while (freq_table[i + 1].frequency != CPUFREQ_TABLE_END) {
		if (freq < freq_table[i].frequency +
		   (freq_table[i + 1].frequency - freq_table[i].frequency) / 2)
			return freq_table[i].frequency;
		i++;
	}

	return freq_table[i].frequency;
}

static int dbx500_cpufreq_init(struct cpufreq_policy *policy)
{
	return cpufreq_generic_init(policy, freq_table, 20 * 1000);
}

static struct cpufreq_driver dbx500_cpufreq_driver = {
	.flags  = CPUFREQ_STICKY | CPUFREQ_CONST_LOOPS,
	.verify = cpufreq_generic_frequency_table_verify,
	.target_index = dbx500_cpufreq_target,
	.get    = dbx500_cpufreq_getspeed,
	.init   = dbx500_cpufreq_init,
	.name   = "DBX500",
	.attr   = cpufreq_generic_attr,
};

static int dbx500_cpufreq_probe(struct platform_device *pdev)
{
	int i = 0;

	freq_table = dev_get_platdata(&pdev->dev);
	if (!freq_table) {
		pr_err("dbx500-cpufreq: Failed to fetch cpufreq table\n");
		return -ENODEV;
	}

	armss_clk = clk_get(&pdev->dev, "armss");
	if (IS_ERR(armss_clk)) {
		pr_err("dbx500-cpufreq: Failed to get armss clk\n");
		return PTR_ERR(armss_clk);
	}

	pr_info("dbx500-cpufreq: Available frequencies:\n");
	while (freq_table[i].frequency != CPUFREQ_TABLE_END) {
		pr_info("  %d Mhz\n", freq_table[i].frequency/1000);
		i++;
	}

	return cpufreq_register_driver(&dbx500_cpufreq_driver);
}

static struct platform_driver dbx500_cpufreq_plat_driver = {
	.driver = {
		.name = "cpufreq-ux500",
		.owner = THIS_MODULE,
	},
	.probe = dbx500_cpufreq_probe,
};

static int __init dbx500_cpufreq_register(void)
{
	return platform_driver_register(&dbx500_cpufreq_plat_driver);
}
device_initcall(dbx500_cpufreq_register);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("cpufreq driver for DBX500");
Commit	Line	Data
7c1a70e9	1	/*
7c1a70e9	2	* Copyright (C) STMicroelectronics 2009
0baf066f	3	* Copyright (C) ST-Ericsson SA 2010-2012
7c1a70e9 MP	4	*
7c1a70e9 MP	5	* License Terms: GNU General Public License v2
7c1a70e9 MP	6	* Author: Sundar Iyer <sundar.iyer@stericsson.com>
	7	* Author: Martin Persson <martin.persson@stericsson.com>
	8	* Author: Jonas Aaberg <jonas.aberg@stericsson.com>
7c1a70e9	9	*/
0baf066f	10
b4689444	11	#include <linux/module.h>
7c1a70e9 MP	12	#include <linux/kernel.h>
	13	#include <linux/cpufreq.h>
	14	#include <linux/delay.h>
72b2fd5c	15	#include <linux/slab.h>
b4689444	16	#include <linux/platform_device.h>
78e30d12	17	#include <linux/clk.h>
7c1a70e9	18
fdb44464	19	static struct cpufreq_frequency_table *freq_table;
78e30d12	20	static struct clk *armss_clk;
72b2fd5c	21
edb10c11	22	static int dbx500_cpufreq_target(struct cpufreq_policy *policy,
9c0ebcf7	23	unsigned int index)
7c1a70e9	24	{
78e30d12	25	/* update armss clk frequency */
d4019f0a	26	return clk_set_rate(armss_clk, freq_table[index].frequency * 1000);
7c1a70e9 MP	27	}
7c1a70e9 MP	28
edb10c11	29	static unsigned int dbx500_cpufreq_getspeed(unsigned int cpu)
7c1a70e9	30	{
fdb44464	31	int i = 0;
78e30d12	32	unsigned long freq = clk_get_rate(armss_clk) / 1000;
fdb44464	33
c7789669 MF	34	/* The value is rounded to closest frequency in the defined table. */
	35	while (freq_table[i + 1].frequency != CPUFREQ_TABLE_END) {
	36	if (freq < freq_table[i].frequency +
	37	(freq_table[i + 1].frequency - freq_table[i].frequency) / 2)
fdb44464 UH	38	return freq_table[i].frequency;
	39	i++;
	40	}
	41
c7789669	42	return freq_table[i].frequency;
7c1a70e9 MP	43	}
7c1a70e9 MP	44
2760984f	45	static int dbx500_cpufreq_init(struct cpufreq_policy *policy)
7c1a70e9	46	{
2b3dc761	47	return cpufreq_generic_init(policy, freq_table, 20 * 1000);
7c1a70e9 MP	48	}
7c1a70e9 MP	49
edb10c11	50	static struct cpufreq_driver dbx500_cpufreq_driver = {
ec669123	51	.flags = CPUFREQ_STICKY \| CPUFREQ_CONST_LOOPS,
47150e98	52	.verify = cpufreq_generic_frequency_table_verify,
9c0ebcf7	53	.target_index = dbx500_cpufreq_target,
edb10c11 LJ	54	.get = dbx500_cpufreq_getspeed,
	55	.init = dbx500_cpufreq_init,
	56	.name = "DBX500",
47150e98	57	.attr = cpufreq_generic_attr,
7c1a70e9 MP	58	};
7c1a70e9 MP	59
edb10c11	60	static int dbx500_cpufreq_probe(struct platform_device *pdev)
b4689444	61	{
3e27996c	62	int i = 0;
fdb44464	63
3e27996c	64	freq_table = dev_get_platdata(&pdev->dev);
fdb44464	65	if (!freq_table) {
edb10c11	66	pr_err("dbx500-cpufreq: Failed to fetch cpufreq table\n");
fdb44464 UH	67	return -ENODEV;
	68	}
	69
3e27996c UH	70	armss_clk = clk_get(&pdev->dev, "armss");
3e27996c UH	71	if (IS_ERR(armss_clk)) {
9291cf9d	72	pr_err("dbx500-cpufreq: Failed to get armss clk\n");
3e27996c UH	73	return PTR_ERR(armss_clk);
	74	}
	75
9291cf9d	76	pr_info("dbx500-cpufreq: Available frequencies:\n");
3e27996c UH	77	while (freq_table[i].frequency != CPUFREQ_TABLE_END) {
	78	pr_info(" %d Mhz\n", freq_table[i].frequency/1000);
	79	i++;
	80	}
	81
edb10c11	82	return cpufreq_register_driver(&dbx500_cpufreq_driver);
b4689444 UH	83	}
b4689444 UH	84
edb10c11	85	static struct platform_driver dbx500_cpufreq_plat_driver = {
b4689444	86	.driver = {
edb10c11	87	.name = "cpufreq-ux500",
b4689444 UH	88	.owner = THIS_MODULE,
b4689444 UH	89	},
edb10c11	90	.probe = dbx500_cpufreq_probe,
b4689444 UH	91	};
b4689444 UH	92
edb10c11	93	static int __init dbx500_cpufreq_register(void)
7c1a70e9	94	{
edb10c11	95	return platform_driver_register(&dbx500_cpufreq_plat_driver);
7c1a70e9	96	}
edb10c11	97	device_initcall(dbx500_cpufreq_register);
b4689444 UH	98
b4689444 UH	99	MODULE_LICENSE("GPL v2");
edb10c11	100	MODULE_DESCRIPTION("cpufreq driver for DBX500");