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path: root/drivers/thermal/tegra/tegra-bpmp-thermal.c
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-rw-r--r--drivers/thermal/tegra/tegra-bpmp-thermal.c270
1 files changed, 270 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..eb84f0b9d
--- /dev/null
+++ b/drivers/thermal/tegra/tegra-bpmp-thermal.c
@@ -0,0 +1,270 @@
+// 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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-21 06:21:17 +0000