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/*
* System Control and Power Interface (SCPI) based CPUFreq Interface driver
*
* It provides necessary ops to arm_big_little cpufreq driver.
*
* Copyright (C) 2015 ARM Ltd.
* Sudeep Holla <sudeep.holla@arm.com>
*
* 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/cpu.h>
#include <linux/cpufreq.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/scpi_protocol.h>
#include <linux/types.h>
#include "arm_big_little.h"
static struct scpi_ops *scpi_ops;
static int scpi_get_transition_latency(struct device *cpu_dev)
{
return scpi_ops->get_transition_latency(cpu_dev);
}
static int scpi_init_opp_table(const struct cpumask *cpumask)
{
int ret;
struct device *cpu_dev = get_cpu_device(cpumask_first(cpumask));
ret = scpi_ops->add_opps_to_device(cpu_dev);
if (ret) {
dev_warn(cpu_dev, "failed to add opps to the device\n");
return ret;
}
ret = dev_pm_opp_set_sharing_cpus(cpu_dev, cpumask);
if (ret)
dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
__func__, ret);
return ret;
}
static struct cpufreq_arm_bL_ops scpi_cpufreq_ops = {
.name = "scpi",
.get_transition_latency = scpi_get_transition_latency,
.init_opp_table = scpi_init_opp_table,
.free_opp_table = dev_pm_opp_cpumask_remove_table,
};
static int scpi_cpufreq_probe(struct platform_device *pdev)
{
scpi_ops = get_scpi_ops();
if (!scpi_ops)
return -EIO;
return bL_cpufreq_register(&scpi_cpufreq_ops);
}
static int scpi_cpufreq_remove(struct platform_device *pdev)
{
bL_cpufreq_unregister(&scpi_cpufreq_ops);
scpi_ops = NULL;
return 0;
}
static struct platform_driver scpi_cpufreq_platdrv = {
.driver = {
.name = "scpi-cpufreq",
},
.probe = scpi_cpufreq_probe,
.remove = scpi_cpufreq_remove,
};
module_platform_driver(scpi_cpufreq_platdrv);
MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
MODULE_DESCRIPTION("ARM SCPI CPUFreq interface driver");
MODULE_LICENSE("GPL v2");
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