blob: 9b0ea8dc4007c83fdbeb6a6c77155d4537d65a00 [file] [log] [blame] [edit]
/*
* Copyright 2017-2018 NXP.
*
* 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.
*
*/
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/device_cooling.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/thermal.h>
#include <soc/imx8/sc/sci.h>
#include "thermal_core.h"
#define IMX_SC_TEMP_PASSIVE_COOL_DELTA 10000
struct imx_sc_sensor {
struct thermal_zone_device *tzd;
struct thermal_cooling_device *cdev;
sc_rsrc_t hw_id;
int temp_passive;
int temp_critical;
};
struct imx_sc_tsens_device {
u32 sensor_num;
struct imx_sc_sensor sensor[0];
};
/* The driver support 1 passive trip point and 1 critical trip point */
enum imx_thermal_trip {
IMX_TRIP_PASSIVE,
IMX_TRIP_CRITICAL,
IMX_TRIP_NUM,
};
static const sc_rsrc_t imx8qm_sensor_hw_id[] = {
SC_R_A53, SC_R_A72, SC_R_GPU_0_PID0, SC_R_GPU_1_PID0,
SC_R_DRC_0, SC_R_PMIC_0, SC_R_PMIC_1, SC_R_PMIC_2,
};
static const sc_rsrc_t imx8qxp_sensor_hw_id[] = {
SC_R_SYSTEM, SC_R_DRC_0, SC_R_PMIC_0,
SC_R_PMIC_1, SC_R_PMIC_2,
};
const int *sensor_hw_id;
sc_ipc_t tsens_ipcHandle;
static int imx_sc_tsens_get_temp(void *data, int *temp)
{
struct imx_sc_sensor *sensor = data;
sc_err_t sciErr;
int16_t celsius;
int8_t tenths;
sciErr = sc_misc_get_temp(tsens_ipcHandle, sensor->hw_id,
SC_C_TEMP, &celsius, &tenths);
/*
* if the SS power domain is down, read temp will fail, so
* we can return the temp of CPU domain instead.
*/
if (sciErr != SC_ERR_NONE) {
sciErr = sc_misc_get_temp(tsens_ipcHandle,
sensor_hw_id[topology_physical_package_id(smp_processor_id())],
SC_C_TEMP, &celsius, &tenths);
if (sciErr != SC_ERR_NONE) {
pr_err("read temp sensor:%d failed\n", sensor->hw_id);
return -EINVAL;
}
}
*temp = celsius * 1000 + tenths;
return 0;
}
static int imx_sc_tsens_get_trend(void *p, int trip, enum thermal_trend *trend)
{
int trip_temp;
struct imx_sc_sensor *sensor = p;
if (!sensor->tzd)
return 0;
trip_temp = (trip == IMX_TRIP_PASSIVE) ? sensor->temp_passive :
sensor->temp_critical;
if (sensor->tzd->temperature >=
(trip_temp - IMX_SC_TEMP_PASSIVE_COOL_DELTA))
*trend = THERMAL_TREND_RAISE_FULL;
else
*trend = THERMAL_TREND_DROP_FULL;
return 0;
}
static int imx_sc_set_trip_temp(void *p, int trip,
int temp)
{
struct imx_sc_sensor *sensor = p;
if (trip == IMX_TRIP_CRITICAL)
sensor->temp_critical = temp;
if (trip == IMX_TRIP_PASSIVE)
sensor->temp_passive = temp;
return 0;
}
static const struct thermal_zone_of_device_ops imx_sc_tsens_ops = {
.get_temp = imx_sc_tsens_get_temp,
.get_trend = imx_sc_tsens_get_trend,
.set_trip_temp = imx_sc_set_trip_temp,
};
static const struct of_device_id imx_sc_tsens_table[] = {
{ .compatible = "nxp,imx8qm-sc-tsens", .data = &imx8qm_sensor_hw_id, },
{ .compatible = "nxp,imx8qxp-sc-tsens", .data = &imx8qxp_sensor_hw_id, },
{},
};
MODULE_DEVICE_TABLE(of, imx_sc_tsens_table);
static int imx_sc_tsens_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct imx_sc_tsens_device *tsens_dev;
struct imx_sc_sensor *sensor;
const struct thermal_trip *trip;
struct thermal_zone_device *tzd;
sc_err_t sciErr;
uint32_t mu_id;
u32 tsens_num;
int ret, sensor_id;
sciErr = sc_ipc_getMuID(&mu_id);
if (sciErr != SC_ERR_NONE) {
dev_err(&pdev->dev, "Can not get the mu id: %d\n", sciErr);
return -ENODEV;
};
sciErr = sc_ipc_open(&tsens_ipcHandle, mu_id);
if (sciErr != SC_ERR_NONE) {
dev_err(&pdev->dev, "open mu channel failed: %d\n", sciErr);
return -EINVAL;
};
sensor_hw_id = of_device_get_match_data(&pdev->dev);
/* get the temp sensor number from device node */
of_property_read_u32(np, "tsens-num", &tsens_num);
if (!tsens_num) {
dev_err(&pdev->dev, "no temp sensor number provided!\n");
return -EINVAL;
}
tsens_dev = devm_kzalloc(&pdev->dev, sizeof(*tsens_dev) +
tsens_num * sizeof(*sensor), GFP_KERNEL);
if (!tsens_dev)
return -ENOMEM;
tsens_dev->sensor_num = tsens_num;
for (sensor_id = 0; sensor_id < tsens_num; sensor_id++) {
sensor = &tsens_dev->sensor[sensor_id];
sensor->hw_id = sensor_hw_id[sensor_id];
tzd = devm_thermal_zone_of_sensor_register(&pdev->dev, sensor_id, sensor,
&imx_sc_tsens_ops);
if (IS_ERR(tzd)) {
dev_err(&pdev->dev, "failed to register temp sensor: %d\n", sensor_id);
ret = -EINVAL;
goto failed;
}
sensor->tzd = tzd;
trip = of_thermal_get_trip_points(sensor->tzd);
sensor->temp_passive = trip[0].temperature;
sensor->temp_critical = trip[1].temperature;
sensor->cdev = devfreq_cooling_register();
if (IS_ERR(sensor->cdev)) {
dev_err(&pdev->dev,
"failed to register devfreq cooling device: %d\n",
ret);
goto failed;
}
ret = thermal_zone_bind_cooling_device(sensor->tzd,
IMX_TRIP_PASSIVE,
sensor->cdev,
THERMAL_NO_LIMIT,
THERMAL_NO_LIMIT,
THERMAL_WEIGHT_DEFAULT);
if (ret) {
dev_err(&sensor->tzd->device,
"binding zone %s with cdev %s failed:%d\n",
sensor->tzd->type, sensor->cdev->type, ret);
devfreq_cooling_unregister(sensor->cdev);
goto failed;
}
}
return 0;
failed:
return ret;
}
static int imx_sc_tsens_remove(struct platform_device *pdev)
{
return 0;
}
static struct platform_driver imx_sc_tsens_driver = {
.probe = imx_sc_tsens_probe,
.remove = imx_sc_tsens_remove,
.driver = {
.name = "i.MX-sc-tsens",
.of_match_table = imx_sc_tsens_table,
},
};
module_platform_driver(imx_sc_tsens_driver);
MODULE_AUTHOR("Jacky Bai<ping.bai@nxp.com");
MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
MODULE_LICENSE("GPL v2");