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: Mikko Perttunen <mperttunen@nvidia.com> Acked-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Mikko Perttunen
Thierry Reding
parent
ac8a1eb05f
commit
7afebede62
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@ -54,7 +54,7 @@ obj-$(CONFIG_INTEL_BXT_PMIC_THERMAL) += intel_bxt_pmic_thermal.o
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obj-$(CONFIG_INTEL_PCH_THERMAL) += intel_pch_thermal.o
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obj-$(CONFIG_ST_THERMAL) += st/
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obj-$(CONFIG_QCOM_TSENS) += qcom/
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obj-$(CONFIG_TEGRA_SOCTHERM) += tegra/
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obj-y += tegra/
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obj-$(CONFIG_HISI_THERMAL) += hisi_thermal.o
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obj-$(CONFIG_MTK_THERMAL) += mtk_thermal.o
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obj-$(CONFIG_GENERIC_ADC_THERMAL) += thermal-generic-adc.o
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@ -10,4 +10,11 @@ config TEGRA_SOCTHERM
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zones to manage temperatures. This option is also required for the
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emergency thermal reset (thermtrip) feature to function.
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config TEGRA_BPMP_THERMAL
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tristate "Tegra BPMP thermal sensing"
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depends on TEGRA_BPMP || COMPILE_TEST
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help
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Enable this option for support for sensing system temperature of NVIDIA
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Tegra systems-on-chip with the BPMP coprocessor (Tegra186).
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endmenu
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@ -1,4 +1,5 @@
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obj-$(CONFIG_TEGRA_SOCTHERM) += tegra-soctherm.o
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obj-$(CONFIG_TEGRA_SOCTHERM) += tegra-soctherm.o
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obj-$(CONFIG_TEGRA_BPMP_THERMAL) += tegra-bpmp-thermal.o
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tegra-soctherm-y := soctherm.o soctherm-fuse.o
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tegra-soctherm-$(CONFIG_ARCH_TEGRA_124_SOC) += tegra124-soctherm.o
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263
drivers/thermal/tegra/tegra-bpmp-thermal.c
Normal file
263
drivers/thermal/tegra/tegra-bpmp-thermal.c
Normal file
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@ -0,0 +1,263 @@
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/*
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* Copyright (c) 2015-2017, NVIDIA CORPORATION. All rights reserved.
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*
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* Author:
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* Mikko Perttunen <mperttunen@nvidia.com>
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* Aapo Vienamo <avienamo@nvidia.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/thermal.h>
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#include <linux/workqueue.h>
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#include <soc/tegra/bpmp.h>
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#include <soc/tegra/bpmp-abi.h>
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struct tegra_bpmp_thermal_zone {
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struct tegra_bpmp_thermal *tegra;
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struct thermal_zone_device *tzd;
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struct work_struct tz_device_update_work;
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unsigned int idx;
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};
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struct tegra_bpmp_thermal {
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struct device *dev;
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struct tegra_bpmp *bpmp;
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unsigned int num_zones;
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struct tegra_bpmp_thermal_zone **zones;
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};
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static int tegra_bpmp_thermal_get_temp(void *data, int *out_temp)
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{
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struct tegra_bpmp_thermal_zone *zone = data;
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struct mrq_thermal_host_to_bpmp_request req;
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union mrq_thermal_bpmp_to_host_response reply;
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struct tegra_bpmp_message msg;
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int err;
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memset(&req, 0, sizeof(req));
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req.type = CMD_THERMAL_GET_TEMP;
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req.get_temp.zone = zone->idx;
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memset(&msg, 0, sizeof(msg));
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msg.mrq = MRQ_THERMAL;
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msg.tx.data = &req;
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msg.tx.size = sizeof(req);
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msg.rx.data = &reply;
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msg.rx.size = sizeof(reply);
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err = tegra_bpmp_transfer(zone->tegra->bpmp, &msg);
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if (err)
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return err;
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*out_temp = reply.get_temp.temp;
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return 0;
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}
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static int tegra_bpmp_thermal_set_trips(void *data, int low, int high)
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{
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struct tegra_bpmp_thermal_zone *zone = data;
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struct mrq_thermal_host_to_bpmp_request req;
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struct tegra_bpmp_message msg;
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memset(&req, 0, sizeof(req));
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req.type = CMD_THERMAL_SET_TRIP;
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req.set_trip.zone = zone->idx;
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req.set_trip.enabled = true;
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req.set_trip.low = low;
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req.set_trip.high = high;
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memset(&msg, 0, sizeof(msg));
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msg.mrq = MRQ_THERMAL;
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msg.tx.data = &req;
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msg.tx.size = sizeof(req);
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return tegra_bpmp_transfer(zone->tegra->bpmp, &msg);
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}
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static void tz_device_update_work_fn(struct work_struct *work)
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{
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struct tegra_bpmp_thermal_zone *zone;
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zone = container_of(work, struct tegra_bpmp_thermal_zone,
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tz_device_update_work);
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thermal_zone_device_update(zone->tzd, THERMAL_TRIP_VIOLATED);
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}
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static void bpmp_mrq_thermal(unsigned int mrq, struct tegra_bpmp_channel *ch,
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void *data)
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{
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struct mrq_thermal_bpmp_to_host_request *req;
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struct tegra_bpmp_thermal *tegra = data;
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int i;
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req = (struct mrq_thermal_bpmp_to_host_request *)ch->ib->data;
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if (req->type != CMD_THERMAL_HOST_TRIP_REACHED) {
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dev_err(tegra->dev, "%s: invalid request type: %d\n",
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__func__, req->type);
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tegra_bpmp_mrq_return(ch, -EINVAL, NULL, 0);
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return;
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}
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for (i = 0; i < tegra->num_zones; ++i) {
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if (tegra->zones[i]->idx != req->host_trip_reached.zone)
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continue;
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schedule_work(&tegra->zones[i]->tz_device_update_work);
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tegra_bpmp_mrq_return(ch, 0, NULL, 0);
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return;
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}
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dev_err(tegra->dev, "%s: invalid thermal zone: %d\n", __func__,
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req->host_trip_reached.zone);
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tegra_bpmp_mrq_return(ch, -EINVAL, NULL, 0);
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}
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static int tegra_bpmp_thermal_get_num_zones(struct tegra_bpmp *bpmp,
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int *num_zones)
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{
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struct mrq_thermal_host_to_bpmp_request req;
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union mrq_thermal_bpmp_to_host_response reply;
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struct tegra_bpmp_message msg;
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int err;
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memset(&req, 0, sizeof(req));
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req.type = CMD_THERMAL_GET_NUM_ZONES;
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memset(&msg, 0, sizeof(msg));
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msg.mrq = MRQ_THERMAL;
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msg.tx.data = &req;
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msg.tx.size = sizeof(req);
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msg.rx.data = &reply;
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msg.rx.size = sizeof(reply);
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err = tegra_bpmp_transfer(bpmp, &msg);
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if (err)
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return err;
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*num_zones = reply.get_num_zones.num;
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return 0;
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}
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static const struct thermal_zone_of_device_ops tegra_bpmp_of_thermal_ops = {
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.get_temp = tegra_bpmp_thermal_get_temp,
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.set_trips = tegra_bpmp_thermal_set_trips,
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};
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static int tegra_bpmp_thermal_probe(struct platform_device *pdev)
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{
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struct tegra_bpmp *bpmp = dev_get_drvdata(pdev->dev.parent);
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struct tegra_bpmp_thermal *tegra;
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struct thermal_zone_device *tzd;
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unsigned int i, max_num_zones;
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int err;
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tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
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if (!tegra)
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return -ENOMEM;
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tegra->dev = &pdev->dev;
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tegra->bpmp = bpmp;
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err = tegra_bpmp_thermal_get_num_zones(bpmp, &max_num_zones);
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if (err) {
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dev_err(&pdev->dev, "failed to get the number of zones: %d\n",
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err);
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return err;
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}
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tegra->zones = devm_kcalloc(&pdev->dev, max_num_zones,
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sizeof(*tegra->zones), GFP_KERNEL);
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if (!tegra->zones)
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return -ENOMEM;
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for (i = 0; i < max_num_zones; ++i) {
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struct tegra_bpmp_thermal_zone *zone;
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int temp;
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zone = devm_kzalloc(&pdev->dev, sizeof(*zone), GFP_KERNEL);
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if (!zone)
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return -ENOMEM;
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zone->idx = i;
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zone->tegra = tegra;
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err = tegra_bpmp_thermal_get_temp(zone, &temp);
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if (err < 0) {
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devm_kfree(&pdev->dev, zone);
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continue;
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}
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tzd = devm_thermal_zone_of_sensor_register(
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&pdev->dev, i, zone, &tegra_bpmp_of_thermal_ops);
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if (IS_ERR(tzd)) {
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if (PTR_ERR(tzd) == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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devm_kfree(&pdev->dev, zone);
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continue;
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}
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zone->tzd = tzd;
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INIT_WORK(&zone->tz_device_update_work,
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tz_device_update_work_fn);
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tegra->zones[tegra->num_zones++] = zone;
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}
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err = tegra_bpmp_request_mrq(bpmp, MRQ_THERMAL, bpmp_mrq_thermal,
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tegra);
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if (err) {
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dev_err(&pdev->dev, "failed to register mrq handler: %d\n",
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err);
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return err;
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}
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platform_set_drvdata(pdev, tegra);
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return 0;
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}
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static int tegra_bpmp_thermal_remove(struct platform_device *pdev)
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{
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struct tegra_bpmp_thermal *tegra = platform_get_drvdata(pdev);
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tegra_bpmp_free_mrq(tegra->bpmp, MRQ_THERMAL, tegra);
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return 0;
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}
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static const struct of_device_id tegra_bpmp_thermal_of_match[] = {
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{ .compatible = "nvidia,tegra186-bpmp-thermal" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, tegra_bpmp_thermal_of_match);
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static struct platform_driver tegra_bpmp_thermal_driver = {
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.probe = tegra_bpmp_thermal_probe,
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.remove = tegra_bpmp_thermal_remove,
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.driver = {
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.name = "tegra-bpmp-thermal",
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.of_match_table = tegra_bpmp_thermal_of_match,
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},
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};
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module_platform_driver(tegra_bpmp_thermal_driver);
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MODULE_AUTHOR("Mikko Perttunen <mperttunen@nvidia.com>");
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MODULE_DESCRIPTION("NVIDIA Tegra BPMP thermal sensor driver");
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MODULE_LICENSE("GPL v2");
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