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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2018-2020 NXP.
*/
#include <dt-bindings/firmware/imx/rsrc.h>
#include <linux/device_cooling.h>
#include <linux/err.h>
#include <linux/firmware/imx/sci.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/thermal.h>
#include "thermal_core.h"
#include "thermal_hwmon.h"
#define IMX_SC_MISC_FUNC_GET_TEMP 13
#define IMX_SC_TEMP_PASSIVE_COOL_DELTA 10000
static struct imx_sc_ipc *thermal_ipc_handle;
struct imx_sc_sensor {
struct thermal_zone_device *tzd;
u32 resource_id;
struct thermal_cooling_device *cdev;
int temp_passive;
int temp_critical;
};
struct imx_sc_thermal_data {
struct imx_sc_sensor *sensor;
};
/* 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,
};
struct req_get_temp {
u16 resource_id;
u8 type;
} __packed __aligned(4);
struct resp_get_temp {
s16 celsius;
s8 tenths;
} __packed __aligned(4);
struct imx_sc_msg_misc_get_temp {
struct imx_sc_rpc_msg hdr;
union {
struct req_get_temp req;
struct resp_get_temp resp;
} data;
} __packed __aligned(4);
static int imx_sc_thermal_get_temp(void *data, int *temp)
{
struct imx_sc_msg_misc_get_temp msg;
struct imx_sc_rpc_msg *hdr = &msg.hdr;
struct imx_sc_sensor *sensor = data;
int ret;
msg.data.req.resource_id = sensor->resource_id;
msg.data.req.type = IMX_SC_C_TEMP;
hdr->ver = IMX_SC_RPC_VERSION;
hdr->svc = IMX_SC_RPC_SVC_MISC;
hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;
hdr->size = 2;
ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
if (ret) {
/*
* if the SS power domain is down, read temp will fail, so
* we can print error once and return 0 directly.
*/
pr_err_once("read temp sensor %d failed, could be SS powered off, ret %d\n",
sensor->resource_id, ret);
*temp = 0;
return 0;
}
*temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;
return 0;
}
static int imx_sc_thermal_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_thermal_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_thermal_ops = {
.get_temp = imx_sc_thermal_get_temp,
.get_trend = imx_sc_thermal_get_trend,
.set_trip_temp = imx_sc_thermal_set_trip_temp,
};
static int imx_sc_thermal_probe(struct platform_device *pdev)
{
struct device_node *np, *child, *sensor_np;
struct imx_sc_sensor *sensor;
const struct thermal_trip *trip;
int ret;
ret = imx_scu_get_handle(&thermal_ipc_handle);
if (ret)
return ret;
np = of_find_node_by_name(NULL, "thermal-zones");
if (!np)
return -ENODEV;
sensor_np = of_node_get(pdev->dev.of_node);
for_each_available_child_of_node(np, child) {
sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
if (!sensor) {
of_node_put(child);
of_node_put(sensor_np);
return -ENOMEM;
}
ret = thermal_zone_of_get_sensor_id(child,
sensor_np,
&sensor->resource_id);
if (ret < 0) {
dev_err(&pdev->dev,
"failed to get valid sensor resource id: %d\n",
ret);
of_node_put(child);
break;
}
sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
sensor->resource_id,
sensor,
&imx_sc_thermal_ops);
if (IS_ERR(sensor->tzd)) {
dev_err(&pdev->dev, "failed to register thermal zone\n");
ret = PTR_ERR(sensor->tzd);
of_node_put(child);
break;
}
if (devm_thermal_add_hwmon_sysfs(sensor->tzd))
dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n");
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);
return ret;
}
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);
return ret;
}
}
of_node_put(sensor_np);
return ret;
}
static int imx_sc_thermal_remove(struct platform_device *pdev)
{
return 0;
}
static const struct of_device_id imx_sc_thermal_table[] = {
{ .compatible = "fsl,imx-sc-thermal", },
{}
};
MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
static struct platform_driver imx_sc_thermal_driver = {
.probe = imx_sc_thermal_probe,
.remove = imx_sc_thermal_remove,
.driver = {
.name = "imx-sc-thermal",
.of_match_table = imx_sc_thermal_table,
},
};
module_platform_driver(imx_sc_thermal_driver);
MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
MODULE_LICENSE("GPL v2");
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