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/*
* Generic big.LITTLE CPUFreq Interface driver
*
* It provides necessary ops to arm_big_little cpufreq driver and gets
* Frequency information from Device Tree. Freq table in DT must be in KHz.
*
* Copyright (C) 2012 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.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/cpufreq.h>
#include <linux/export.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/types.h>
#include "arm_big_little.h"
static struct cpufreq_frequency_table *generic_get_freq_tbl(u32 cluster,
int *count)
{
struct device_node *np = NULL;
const struct property *pp;
unsigned int *table = NULL;
int cluster_id;
struct cpufreq_frequency_table *cpufreq_table;
while ((np = of_find_node_by_name(np, "cluster"))) {
if (of_property_read_u32(np, "reg", &cluster_id))
continue;
if (cluster_id != cluster)
continue;
pp = of_find_property(np, "freqs", NULL);
if (!pp)
continue;
*count = pp->length / sizeof(u32);
if (!*count)
continue;
table = kmalloc(sizeof(*table) * (*count), GFP_KERNEL);
if (!table) {
pr_err("%s: Failed to allocate memory for table\n",
__func__);
return NULL;
}
of_property_read_u32_array(np, "freqs", table, *count);
break;
}
if (!table) {
pr_err("%s: Unable to retrieve Freq table from Device Tree",
__func__);
return NULL;
}
cpufreq_table = arm_bL_copy_table_from_array(table, *count);
kfree(table);
return cpufreq_table;
}
static void generic_put_freq_tbl(u32 cluster)
{
arm_bL_free_freq_table(cluster);
}
static struct cpufreq_arm_bL_ops generic_bL_ops = {
.name = "generic-bl",
.get_freq_tbl = generic_get_freq_tbl,
.put_freq_tbl = generic_put_freq_tbl,
};
static int generic_bL_init(void)
{
return bL_cpufreq_register(&generic_bL_ops);
}
module_init(generic_bL_init);
static void generic_bL_exit(void)
{
return bL_cpufreq_unregister(&generic_bL_ops);
}
module_exit(generic_bL_exit);
MODULE_DESCRIPTION("Generic ARM big LITTLE cpufreq driver");
MODULE_LICENSE("GPL");
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