diff options
Diffstat (limited to 'drivers/thermal/tegra/tegra-bpmp-thermal.c')
-rw-r--r-- | drivers/thermal/tegra/tegra-bpmp-thermal.c | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/drivers/thermal/tegra/tegra-bpmp-thermal.c b/drivers/thermal/tegra/tegra-bpmp-thermal.c new file mode 100644 index 000000000..b0980dbca --- /dev/null +++ b/drivers/thermal/tegra/tegra-bpmp-thermal.c @@ -0,0 +1,263 @@ +/* + * 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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