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/*
* Vexpress 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) 2013 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/opp.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/vexpress.h>
#include "arm_big_little.h"
static int vexpress_init_opp_table(struct device *cpu_dev)
{
int i = -1, count, cluster = cpu_to_cluster(cpu_dev->id);
u32 *table;
int ret;
count = vexpress_spc_get_freq_table(cluster, &table);
if (!table || !count) {
pr_err("SPC controller returned invalid freq table");
return -EINVAL;
}
while (++i < count) {
/* FIXME: Voltage value */
ret = opp_add(cpu_dev, table[i] * 1000, 900000);
if (ret) {
dev_warn(cpu_dev, "%s: Failed to add OPP %d, err: %d\n",
__func__, table[i] * 1000, ret);
return ret;
}
}
return 0;
}
static int vexpress_get_transition_latency(struct device *cpu_dev)
{
/* 1 ms */
return 1000000;
}
static struct cpufreq_arm_bL_ops vexpress_bL_ops = {
.name = "vexpress-bL",
.get_transition_latency = vexpress_get_transition_latency,
.init_opp_table = vexpress_init_opp_table,
};
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_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
MODULE_DESCRIPTION("ARM Vexpress big LITTLE cpufreq driver");
MODULE_LICENSE("GPL");
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