1 files changed, 242 insertions, 0 deletions
diff --git a/drivers/thermal/imx_sc_thermal.c b/drivers/thermal/imx_sc_thermal.c
new file mode 100644
index 000000000000..8c5049020cd8
--- /dev/null
+++ b/drivers/thermal/imx_sc_thermal.c
@@ -0,0 +1,242 @@
+/*
+ * Copyright 2017-2018 NXP.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/device_cooling.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/slab.h>
+#include <linux/thermal.h>
+#include <soc/imx8/sc/sci.h>
+
+#include "thermal_core.h"
+
+#define IMX_SC_TEMP_PASSIVE_COOL_DELTA	10000
+
+struct imx_sc_sensor {
+	struct thermal_zone_device *tzd;
+	struct thermal_cooling_device *cdev;
+	sc_rsrc_t hw_id;
+	int temp_passive;
+	int temp_critical;
+};
+
+struct imx_sc_tsens_device {
+	u32 sensor_num;
+	struct imx_sc_sensor sensor[0];
+};
+
+/* The driver support 1 passive trip point and 1 critical trip point */
+enum imx_thermal_trip {
+	IMX_TRIP_PASSIVE,
+	IMX_TRIP_CRITICAL,
+	IMX_TRIP_NUM,
+};
+
+static const sc_rsrc_t imx8qm_sensor_hw_id[] = {
+	SC_R_A53, SC_R_A72, SC_R_GPU_0_PID0, SC_R_GPU_1_PID0,
+	SC_R_DRC_0, SC_R_PMIC_0, SC_R_PMIC_1, SC_R_PMIC_2,
+};
+
+static const sc_rsrc_t imx8qxp_sensor_hw_id[] = {
+	SC_R_SYSTEM, SC_R_DRC_0, SC_R_PMIC_0,
+	SC_R_PMIC_1, SC_R_PMIC_2,
+};
+
+const int *sensor_hw_id;
+sc_ipc_t tsens_ipcHandle;
+
+static int imx_sc_tsens_get_temp(void *data, int *temp)
+{
+	struct imx_sc_sensor *sensor = data;
+	sc_err_t sciErr;
+	int16_t celsius;
+	int8_t tenths;
+
+	sciErr = sc_misc_get_temp(tsens_ipcHandle, sensor->hw_id,
+			SC_C_TEMP, &celsius, &tenths);
+	/*
+	 * if the SS power domain is down, read temp will fail, so
+	 * we can return the temp of CPU domain instead.
+	 */
+	if (sciErr != SC_ERR_NONE) {
+		sciErr = sc_misc_get_temp(tsens_ipcHandle,
+			sensor_hw_id[topology_physical_package_id(smp_processor_id())],
+			SC_C_TEMP, &celsius, &tenths);
+		if (sciErr != SC_ERR_NONE) {
+			pr_err("read temp sensor:%d failed\n", sensor->hw_id);
+			return -EINVAL;
+		}
+	}
+	*temp = celsius * 1000 + tenths * 100;
+
+	return 0;
+}
+
+static int imx_sc_tsens_get_trend(void *p, int trip, enum thermal_trend *trend)
+{
+	int trip_temp;
+	struct imx_sc_sensor *sensor = p;
+
+	if (!sensor->tzd)
+		return 0;
+
+	trip_temp = (trip == IMX_TRIP_PASSIVE) ? sensor->temp_passive :
+					     sensor->temp_critical;
+
+	if (sensor->tzd->temperature >=
+		(trip_temp - IMX_SC_TEMP_PASSIVE_COOL_DELTA))
+		*trend = THERMAL_TREND_RAISE_FULL;
+	else
+		*trend = THERMAL_TREND_DROP_FULL;
+
+	return 0;
+}
+
+static int imx_sc_set_trip_temp(void *p, int trip,
+			     int temp)
+{
+	struct imx_sc_sensor *sensor = p;
+
+	if (trip == IMX_TRIP_CRITICAL)
+		sensor->temp_critical = temp;
+
+	if (trip == IMX_TRIP_PASSIVE)
+		sensor->temp_passive = temp;
+
+	return 0;
+}
+
+static const struct thermal_zone_of_device_ops imx_sc_tsens_ops = {
+	.get_temp = imx_sc_tsens_get_temp,
+	.get_trend = imx_sc_tsens_get_trend,
+	.set_trip_temp = imx_sc_set_trip_temp,
+};
+
+static const struct of_device_id imx_sc_tsens_table[] = {
+	{ .compatible = "nxp,imx8qm-sc-tsens", .data = &imx8qm_sensor_hw_id, },
+	{ .compatible = "nxp,imx8qxp-sc-tsens", .data = &imx8qxp_sensor_hw_id, },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, imx_sc_tsens_table);
+
+static int imx_sc_tsens_probe(struct platform_device *pdev)
+{
+	struct device_node *tz_np, *child_tz_np = NULL;
+	struct device_node *np = pdev->dev.of_node;
+	struct imx_sc_tsens_device *tsens_dev;
+	struct imx_sc_sensor *sensor;
+	const struct thermal_trip *trip;
+	struct thermal_zone_device *tzd;
+	sc_err_t sciErr;
+	uint32_t mu_id;
+	u32 tsens_num;
+	int ret, sensor_id;
+
+	sciErr = sc_ipc_getMuID(&mu_id);
+	if (sciErr != SC_ERR_NONE) {
+		dev_err(&pdev->dev, "Can not get the mu id: %d\n", sciErr);
+		return -ENODEV;
+	};
+
+	sciErr = sc_ipc_open(&tsens_ipcHandle, mu_id);
+	if (sciErr != SC_ERR_NONE) {
+		dev_err(&pdev->dev, "open mu channel failed: %d\n", sciErr);
+		return -EINVAL;
+	};
+	sensor_hw_id = of_device_get_match_data(&pdev->dev);
+
+	/* get the temp sensor number from device node */
+	of_property_read_u32(np, "tsens-num", &tsens_num);
+	if (!tsens_num) {
+		dev_err(&pdev->dev, "no temp sensor number provided!\n");
+		return -EINVAL;
+	}
+
+	tsens_dev = devm_kzalloc(&pdev->dev, sizeof(*tsens_dev) +
+				 tsens_num * sizeof(*sensor), GFP_KERNEL);
+	if (!tsens_dev)
+		return -ENOMEM;
+
+	tsens_dev->sensor_num = tsens_num;
+
+	tz_np = of_find_node_by_name(NULL, "thermal-zones");
+	if (!tz_np)
+		return -ENODEV;
+
+	for (sensor_id = 0; sensor_id < tsens_num; sensor_id++) {
+		child_tz_np = of_get_next_child(tz_np, child_tz_np);
+		if (!of_device_is_available(child_tz_np))
+			continue;
+
+		sensor = &tsens_dev->sensor[sensor_id];
+		sensor->hw_id = sensor_hw_id[sensor_id];
+		tzd = devm_thermal_zone_of_sensor_register(&pdev->dev, sensor_id, sensor,
+		 &imx_sc_tsens_ops);
+		if (IS_ERR(tzd)) {
+			dev_err(&pdev->dev, "failed to register temp sensor: %d\n", sensor_id);
+			ret = -EINVAL;
+			goto failed;
+		}
+		sensor->tzd = tzd;
+		trip = of_thermal_get_trip_points(sensor->tzd);
+		sensor->temp_passive = trip[0].temperature;
+		sensor->temp_critical = trip[1].temperature;
+
+		sensor->cdev = devfreq_cooling_register();
+		if (IS_ERR(sensor->cdev)) {
+			dev_err(&pdev->dev,
+				"failed to register devfreq cooling device: %d\n",
+				ret);
+			goto failed;
+		}
+
+		ret = thermal_zone_bind_cooling_device(sensor->tzd,
+			IMX_TRIP_PASSIVE,
+			sensor->cdev,
+			THERMAL_NO_LIMIT,
+			THERMAL_NO_LIMIT,
+			THERMAL_WEIGHT_DEFAULT);
+		if (ret) {
+			dev_err(&sensor->tzd->device,
+				"binding zone %s with cdev %s failed:%d\n",
+				sensor->tzd->type, sensor->cdev->type, ret);
+			devfreq_cooling_unregister(sensor->cdev);
+			goto failed;
+		}
+	}
+
+	return 0;
+failed:
+	return ret;
+}
+
+static int imx_sc_tsens_remove(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static struct platform_driver imx_sc_tsens_driver = {
+		.probe = imx_sc_tsens_probe,
+		.remove = imx_sc_tsens_remove,
+		.driver = {
+			.name = "imx-sc-thermal",
+			.of_match_table = imx_sc_tsens_table,
+		},
+};
+
+module_platform_driver(imx_sc_tsens_driver);
+
+MODULE_AUTHOR("Jacky Bai<ping.bai@nxp.com");
+MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
+MODULE_LICENSE("GPL v2");