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/*
* Vexpress big.LITTLE CPUFreq Interface driver
*
* It provides necessary ops to arm_big_little cpufreq driver and gets
* information from spc controller.
*
* Copyright (C) 2012 ARM Ltd.
* Author: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
*
* 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/types.h>
#include <linux/vexpress.h>
#include "arm_big_little.h"
static struct cpufreq_frequency_table *vexpress_get_freq_tbl(u32 cluster,
int *count)
{
unsigned int *table = vexpress_spc_get_freq_table(cluster, count);
if (!table || !*count) {
pr_err("SPC controller returned invalid freq table");
return NULL;
}
return arm_bL_copy_table_from_array(table, *count);
}
static void vexpress_put_freq_tbl(u32 cluster)
{
arm_bL_free_freq_table(cluster);
}
static struct cpufreq_arm_bL_ops vexpress_bL_ops = {
.name = "vexpress-bL",
.get_freq_tbl = vexpress_get_freq_tbl,
.put_freq_tbl = vexpress_put_freq_tbl,
};
static int vexpress_bL_init(void)
{
if (!vexpress_spc_check_loaded()) {
pr_info("%s: No SPC found\n", __func__);
return -ENOENT;
}
return bL_cpufreq_register(&vexpress_bL_ops);
}
module_init(vexpress_bL_init);
static void vexpress_bL_exit(void)
{
return bL_cpufreq_unregister(&vexpress_bL_ops);
}
module_exit(vexpress_bL_exit);
MODULE_DESCRIPTION("ARM Vexpress big LITTLE cpufreq driver");
MODULE_LICENSE("GPL");
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