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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2019, The Linux Foundation. All rights reserved.
*/
#define pr_fmt(fmt) "devfreq-qcom-qoslat: " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/platform_device.h>
#include <linux/devfreq.h>
#include <linux/pm_opp.h>
#include <linux/of.h>
#include <linux/mailbox_client.h>
#include <linux/mailbox/qmp.h>
struct qoslat_data {
struct mbox_client mbox_cl;
struct mbox_chan *mbox;
struct devfreq *df;
struct devfreq_dev_profile profile;
unsigned int qos_level;
};
#define QOS_LEVEL_OFF 1
#define QOS_LEVEL_ON 2
#define MAX_MSG_LEN 96
static int update_qos_level(struct device *dev, struct qoslat_data *d)
{
struct qmp_pkt pkt;
char mbox_msg[MAX_MSG_LEN + 1] = {0};
char *qos_msg = "off";
int ret;
if (d->qos_level == QOS_LEVEL_ON)
qos_msg = "on";
snprintf(mbox_msg, MAX_MSG_LEN, "{class: ddr, perfmode: %s}", qos_msg);
pkt.size = MAX_MSG_LEN;
pkt.data = mbox_msg;
ret = mbox_send_message(d->mbox, &pkt);
if (ret < 0) {
dev_err(dev, "Failed to send mbox message: %d\n", ret);
return ret;
}
return 0;
}
static int dev_target(struct device *dev, unsigned long *freq, u32 flags)
{
struct qoslat_data *d = dev_get_drvdata(dev);
struct dev_pm_opp *opp;
opp = devfreq_recommended_opp(dev, freq, flags);
if (!IS_ERR(opp))
dev_pm_opp_put(opp);
else
return PTR_ERR(opp);
if (*freq == d->qos_level)
return 0;
d->qos_level = *freq;
return update_qos_level(dev, d);
}
static int dev_get_cur_freq(struct device *dev, unsigned long *freq)
{
struct qoslat_data *d = dev_get_drvdata(dev);
*freq = d->qos_level;
return 0;
}
static int devfreq_qcom_qoslat_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct qoslat_data *d;
struct devfreq_dev_profile *p;
const char *gov_name;
int ret = 0;
d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
if (!d)
return -ENOMEM;
dev_set_drvdata(dev, d);
if (!of_find_property(dev->of_node, "mboxes", NULL)) {
dev_err(dev, "Couldn't find AOP mbox\n");
return -EINVAL;
}
d->mbox_cl.dev = dev;
d->mbox_cl.tx_block = true;
d->mbox_cl.tx_tout = 1000;
d->mbox_cl.knows_txdone = false;
d->mbox = mbox_request_channel(&d->mbox_cl, 0);
if (IS_ERR(d->mbox)) {
ret = PTR_ERR(d->mbox);
dev_err(dev, "Failed to get mailbox channel: %d\n", ret);
return ret;
}
d->qos_level = QOS_LEVEL_OFF;
p = &d->profile;
p->target = dev_target;
p->get_cur_freq = dev_get_cur_freq;
p->polling_ms = 10;
ret = dev_pm_opp_of_add_table(dev);
if (ret < 0)
dev_err(dev, "Couldn't parse OPP table: %d\n", ret);
if (of_property_read_string(dev->of_node, "governor", &gov_name))
gov_name = "powersave";
d->df = devfreq_add_device(dev, p, gov_name, NULL);
if (IS_ERR(d->df)) {
ret = PTR_ERR(d->df);
dev_err(dev, "Failed to add devfreq device: %d\n", ret);
return ret;
}
return 0;
}
static const struct of_device_id devfreq_qoslat_match_table[] = {
{ .compatible = "qcom,devfreq-qoslat" },
{}
};
static struct platform_driver devfreq_qcom_qoslat_driver = {
.probe = devfreq_qcom_qoslat_probe,
.driver = {
.name = "devfreq-qcom-qoslat",
.of_match_table = devfreq_qoslat_match_table,
},
};
module_platform_driver(devfreq_qcom_qoslat_driver);
MODULE_DESCRIPTION("Device driver for setting memory latency qos level");
MODULE_LICENSE("GPL v2");
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