Commit 7afebede authored by Mikko Perttunen's avatar Mikko Perttunen Committed by Thierry Reding
Browse files

thermal: Add Tegra BPMP thermal sensor driver 



On Tegra186, the BPMP (Boot and Power Management Processor) exposes an
interface to thermal sensors on the system-on-chip. This driver
implements access to the interface. It supports reading the
temperature, setting trip points and receiving notification of a
tripped trip point.

Signed-off-by: default avatarMikko Perttunen <mperttunen@nvidia.com>
Acked-by: default avatarZhang Rui <rui.zhang@intel.com>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent ac8a1eb0

drivers/thermal/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -54,7 +54,7 @@ obj-$(CONFIG_INTEL_BXT_PMIC_THERMAL) += intel_bxt_pmic_thermal.o 
obj-$(CONFIG_INTEL_PCH_THERMAL)	+= intel_pch_thermal.o

obj-$(CONFIG_ST_THERMAL)	+= st/

obj-$(CONFIG_QCOM_TSENS)	+= qcom/

obj-$(CONFIG_TEGRA_SOCTHERM)	+= tegra/

obj-y				+= tegra/

obj-$(CONFIG_HISI_THERMAL)     += hisi_thermal.o

obj-$(CONFIG_MTK_THERMAL)	+= mtk_thermal.o

obj-$(CONFIG_GENERIC_ADC_THERMAL)	+= thermal-generic-adc.o

drivers/thermal/tegra/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -10,4 +10,11 @@ config TEGRA_SOCTHERM 
	  zones to manage temperatures. This option is also required for the

	  emergency thermal reset (thermtrip) feature to function.



config TEGRA_BPMP_THERMAL

	tristate "Tegra BPMP thermal sensing"

	depends on TEGRA_BPMP || COMPILE_TEST

	help

	 Enable this option for support for sensing system temperature of NVIDIA

	 Tegra systems-on-chip with the BPMP coprocessor (Tegra186).



endmenu

drivers/thermal/tegra/Makefile

+2 −1
Original line number Diff line number Diff line 
obj-$(CONFIG_TEGRA_SOCTHERM)		+= tegra-soctherm.o

obj-$(CONFIG_TEGRA_BPMP_THERMAL)	+= tegra-bpmp-thermal.o



tegra-soctherm-y				:= soctherm.o soctherm-fuse.o

tegra-soctherm-$(CONFIG_ARCH_TEGRA_124_SOC)	+= tegra124-soctherm.o

drivers/thermal/tegra/tegra-bpmp-thermal.c

0 → 100644
+263 −0
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2015-2017, NVIDIA CORPORATION.  All rights reserved.

 *

 * Author:

 *	Mikko Perttunen <mperttunen@nvidia.com>

 *	Aapo Vienamo	<avienamo@nvidia.com>

 *

 * This software is licensed under the terms of the GNU General Public

 * License version 2, as published by the Free Software Foundation, and

 * may be copied, distributed, and modified under those terms.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 */



#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(void *data, int *out_temp)

{

	struct tegra_bpmp_thermal_zone *zone = data;

	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;



	*out_temp = reply.get_temp.temp;



	return 0;

}



static int tegra_bpmp_thermal_set_trips(void *data, int low, int high)

{

	struct tegra_bpmp_thermal_zone *zone = data;

	struct mrq_thermal_host_to_bpmp_request req;

	struct tegra_bpmp_message msg;



	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);



	return tegra_bpmp_transfer(zone->tegra->bpmp, &msg);

}



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;



	*num_zones = reply.get_num_zones.num;



	return 0;

}



static const struct thermal_zone_of_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_zone_of_sensor_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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