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/*
* SCPI CPUFreq Interface driver
*
* It provides necessary ops to arm_big_little cpufreq driver.
*
* Copyright (C) 2014 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/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 int scpi_init_opp_table(struct device *cpu_dev)
{
u8 domain = topology_physical_package_id(cpu_dev->id);
struct scpi_opp *opps;
int idx, ret = 0, max_opp;
struct scpi_opp_entry *opp;
opps = scpi_dvfs_get_opps(domain);
if (IS_ERR(opps))
return PTR_ERR(opps);
opp = opps->opp;
max_opp = opps->count;
for (idx = 0; idx < max_opp; idx++, opp++) {
ret = dev_pm_opp_add(cpu_dev, opp->freq_hz, opp->volt_mv*1000);
if (ret) {
dev_warn(cpu_dev, "failed to add opp %uHz %umV\n",
opp->freq_hz, opp->volt_mv);
return ret;
}
}
return ret;
}
static int scpi_get_transition_latency(struct device *cpu_dev)
{
u8 domain = topology_physical_package_id(cpu_dev->id);
struct scpi_opp *opp;
opp = scpi_dvfs_get_opps(domain);
if (IS_ERR(opp))
return PTR_ERR(opp);
return opp->latency * 1000; /* SCPI returns in uS */
}
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,
};
static int scpi_cpufreq_probe(struct platform_device *pdev)
{
return bL_cpufreq_register(&scpi_cpufreq_ops);
}
static int scpi_cpufreq_remove(struct platform_device *pdev)
{
bL_cpufreq_unregister(&scpi_cpufreq_ops);
return 0;
}
static struct of_device_id scpi_cpufreq_of_match[] = {
{ .compatible = "arm,scpi-cpufreq" },
{},
};
MODULE_DEVICE_TABLE(of, scpi_cpufreq_of_match);
static struct platform_driver scpi_cpufreq_platdrv = {
.driver = {
.name = "scpi-cpufreq",
.owner = THIS_MODULE,
.of_match_table = scpi_cpufreq_of_match,
},
.probe = scpi_cpufreq_probe,
.remove = scpi_cpufreq_remove,
};
module_platform_driver(scpi_cpufreq_platdrv);
MODULE_LICENSE("GPL");
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