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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015-2017, NVIDIA CORPORATION. All rights reserved.
*
* Author:
* Mikko Perttunen <mperttunen@nvidia.com>
* Aapo Vienamo <avienamo@nvidia.com>
*/
#include <linux/err.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/thermal.h>
#include <linux/workqueue.h>
#include <soc/tegra/bpmp.h>
#include <soc/tegra/bpmp-abi.h>
struct tegra_bpmp_thermal_zone {
struct tegra_bpmp_thermal *tegra;
struct thermal_zone_device *tzd;
struct work_struct tz_device_update_work;
unsigned int idx;
};
struct tegra_bpmp_thermal {
struct device *dev;
struct tegra_bpmp *bpmp;
unsigned int num_zones;
struct tegra_bpmp_thermal_zone **zones;
};
static int __tegra_bpmp_thermal_get_temp(struct tegra_bpmp_thermal_zone *zone,
int *out_temp)
{
struct mrq_thermal_host_to_bpmp_request req;
union mrq_thermal_bpmp_to_host_response reply;
struct tegra_bpmp_message msg;
int err;
memset(&req, 0, sizeof(req));
req.type = CMD_THERMAL_GET_TEMP;
req.get_temp.zone = zone->idx;
memset(&msg, 0, sizeof(msg));
msg.mrq = MRQ_THERMAL;
msg.tx.data = &req;
msg.tx.size = sizeof(req);
msg.rx.data = &reply;
msg.rx.size = sizeof(reply);
err = tegra_bpmp_transfer(zone->tegra->bpmp, &msg);
if (err)
return err;
if (msg.rx.ret)
return -EINVAL;
*out_temp = reply.get_temp.temp;
return 0;
}
static int tegra_bpmp_thermal_get_temp(struct thermal_zone_device *tz, int *out_temp)
{
return __tegra_bpmp_thermal_get_temp(tz->devdata, out_temp);
}
static int tegra_bpmp_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)
{
struct tegra_bpmp_thermal_zone *zone = tz->devdata;
struct mrq_thermal_host_to_bpmp_request req;
struct tegra_bpmp_message msg;
int err;
memset(&req, 0, sizeof(req));
req.type = CMD_THERMAL_SET_TRIP;
req.set_trip.zone = zone->idx;
req.set_trip.enabled = true;
req.set_trip.low = low;
req.set_trip.high = high;
memset(&msg, 0, sizeof(msg));
msg.mrq = MRQ_THERMAL;
msg.tx.data = &req;
msg.tx.size = sizeof(req);
err = tegra_bpmp_transfer(zone->tegra->bpmp, &msg);
if (err)
return err;
if (msg.rx.ret)
return -EINVAL;
return 0;
}
static void tz_device_update_work_fn(struct work_struct *work)
{
struct tegra_bpmp_thermal_zone *zone;
zone = container_of(work, struct tegra_bpmp_thermal_zone,
tz_device_update_work);
thermal_zone_device_update(zone->tzd, THERMAL_TRIP_VIOLATED);
}
static void bpmp_mrq_thermal(unsigned int mrq, struct tegra_bpmp_channel *ch,
void *data)
{
struct mrq_thermal_bpmp_to_host_request *req;
struct tegra_bpmp_thermal *tegra = data;
int i;
req = (struct mrq_thermal_bpmp_to_host_request *)ch->ib->data;
if (req->type != CMD_THERMAL_HOST_TRIP_REACHED) {
dev_err(tegra->dev, "%s: invalid request type: %d\n",
__func__, req->type);
tegra_bpmp_mrq_return(ch, -EINVAL, NULL, 0);
return;
}
for (i = 0; i < tegra->num_zones; ++i) {
if (tegra->zones[i]->idx != req->host_trip_reached.zone)
continue;
schedule_work(&tegra->zones[i]->tz_device_update_work);
tegra_bpmp_mrq_return(ch, 0, NULL, 0);
return;
}
dev_err(tegra->dev, "%s: invalid thermal zone: %d\n", __func__,
req->host_trip_reached.zone);
tegra_bpmp_mrq_return(ch, -EINVAL, NULL, 0);
}
static int tegra_bpmp_thermal_get_num_zones(struct tegra_bpmp *bpmp,
int *num_zones)
{
struct mrq_thermal_host_to_bpmp_request req;
union mrq_thermal_bpmp_to_host_response reply;
struct tegra_bpmp_message msg;
int err;
memset(&req, 0, sizeof(req));
req.type = CMD_THERMAL_GET_NUM_ZONES;
memset(&msg, 0, sizeof(msg));
msg.mrq = MRQ_THERMAL;
msg.tx.data = &req;
msg.tx.size = sizeof(req);
msg.rx.data = &reply;
msg.rx.size = sizeof(reply);
err = tegra_bpmp_transfer(bpmp, &msg);
if (err)
return err;
if (msg.rx.ret)
return -EINVAL;
*num_zones = reply.get_num_zones.num;
return 0;
}
static const struct thermal_zone_device_ops tegra_bpmp_of_thermal_ops = {
.get_temp = tegra_bpmp_thermal_get_temp,
.set_trips = tegra_bpmp_thermal_set_trips,
};
static int tegra_bpmp_thermal_probe(struct platform_device *pdev)
{
struct tegra_bpmp *bpmp = dev_get_drvdata(pdev->dev.parent);
struct tegra_bpmp_thermal *tegra;
struct thermal_zone_device *tzd;
unsigned int i, max_num_zones;
int err;
tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
if (!tegra)
return -ENOMEM;
tegra->dev = &pdev->dev;
tegra->bpmp = bpmp;
err = tegra_bpmp_thermal_get_num_zones(bpmp, &max_num_zones);
if (err) {
dev_err(&pdev->dev, "failed to get the number of zones: %d\n",
err);
return err;
}
tegra->zones = devm_kcalloc(&pdev->dev, max_num_zones,
sizeof(*tegra->zones), GFP_KERNEL);
if (!tegra->zones)
return -ENOMEM;
for (i = 0; i < max_num_zones; ++i) {
struct tegra_bpmp_thermal_zone *zone;
int temp;
zone = devm_kzalloc(&pdev->dev, sizeof(*zone), GFP_KERNEL);
if (!zone)
return -ENOMEM;
zone->idx = i;
zone->tegra = tegra;
err = __tegra_bpmp_thermal_get_temp(zone, &temp);
if (err < 0) {
devm_kfree(&pdev->dev, zone);
continue;
}
tzd = devm_thermal_of_zone_register(
&pdev->dev, i, zone, &tegra_bpmp_of_thermal_ops);
if (IS_ERR(tzd)) {
if (PTR_ERR(tzd) == -EPROBE_DEFER)
return -EPROBE_DEFER;
devm_kfree(&pdev->dev, zone);
continue;
}
zone->tzd = tzd;
INIT_WORK(&zone->tz_device_update_work,
tz_device_update_work_fn);
tegra->zones[tegra->num_zones++] = zone;
}
err = tegra_bpmp_request_mrq(bpmp, MRQ_THERMAL, bpmp_mrq_thermal,
tegra);
if (err) {
dev_err(&pdev->dev, "failed to register mrq handler: %d\n",
err);
return err;
}
platform_set_drvdata(pdev, tegra);
return 0;
}
static int tegra_bpmp_thermal_remove(struct platform_device *pdev)
{
struct tegra_bpmp_thermal *tegra = platform_get_drvdata(pdev);
tegra_bpmp_free_mrq(tegra->bpmp, MRQ_THERMAL, tegra);
return 0;
}
static const struct of_device_id tegra_bpmp_thermal_of_match[] = {
{ .compatible = "nvidia,tegra186-bpmp-thermal" },
{ },
};
MODULE_DEVICE_TABLE(of, tegra_bpmp_thermal_of_match);
static struct platform_driver tegra_bpmp_thermal_driver = {
.probe = tegra_bpmp_thermal_probe,
.remove = tegra_bpmp_thermal_remove,
.driver = {
.name = "tegra-bpmp-thermal",
.of_match_table = tegra_bpmp_thermal_of_match,
},
};
module_platform_driver(tegra_bpmp_thermal_driver);
MODULE_AUTHOR("Mikko Perttunen <mperttunen@nvidia.com>");
MODULE_DESCRIPTION("NVIDIA Tegra BPMP thermal sensor driver");
MODULE_LICENSE("GPL v2");
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