1 files changed, 149 insertions, 0 deletions
diff --git a/drivers/thermal/imx_sc_thermal.c b/drivers/thermal/imx_sc_thermal.c
new file mode 100644
index 000000000..dfadb0358
--- /dev/null
+++ b/drivers/thermal/imx_sc_thermal.c
@@ -0,0 +1,149 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018-2020 NXP.
+ */
+
+#include <dt-bindings/firmware/imx/rsrc.h>
+#include <linux/err.h>
+#include <linux/firmware/imx/sci.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/thermal.h>
+
+#include "thermal_core.h"
+#include "thermal_hwmon.h"
+
+#define IMX_SC_MISC_FUNC_GET_TEMP	13
+
+static struct imx_sc_ipc *thermal_ipc_handle;
+
+struct imx_sc_sensor {
+	struct thermal_zone_device *tzd;
+	u32 resource_id;
+};
+
+struct req_get_temp {
+	u16 resource_id;
+	u8 type;
+} __packed __aligned(4);
+
+struct resp_get_temp {
+	s16 celsius;
+	s8 tenths;
+} __packed __aligned(4);
+
+struct imx_sc_msg_misc_get_temp {
+	struct imx_sc_rpc_msg hdr;
+	union {
+		struct req_get_temp req;
+		struct resp_get_temp resp;
+	} data;
+} __packed __aligned(4);
+
+static int imx_sc_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
+{
+	struct imx_sc_msg_misc_get_temp msg;
+	struct imx_sc_rpc_msg *hdr = &msg.hdr;
+	struct imx_sc_sensor *sensor = tz->devdata;
+	int ret;
+
+	msg.data.req.resource_id = sensor->resource_id;
+	msg.data.req.type = IMX_SC_C_TEMP;
+
+	hdr->ver = IMX_SC_RPC_VERSION;
+	hdr->svc = IMX_SC_RPC_SVC_MISC;
+	hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;
+	hdr->size = 2;
+
+	ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
+	if (ret) {
+		dev_err(&sensor->tzd->device, "read temp sensor %d failed, ret %d\n",
+			sensor->resource_id, ret);
+		return ret;
+	}
+
+	*temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;
+
+	return 0;
+}
+
+static const struct thermal_zone_device_ops imx_sc_thermal_ops = {
+	.get_temp = imx_sc_thermal_get_temp,
+};
+
+static int imx_sc_thermal_probe(struct platform_device *pdev)
+{
+	struct imx_sc_sensor *sensor;
+	const int *resource_id;
+	int i, ret;
+
+	ret = imx_scu_get_handle(&thermal_ipc_handle);
+	if (ret)
+		return ret;
+
+	resource_id = of_device_get_match_data(&pdev->dev);
+	if (!resource_id)
+		return -EINVAL;
+
+	for (i = 0; resource_id[i] >= 0; i++) {
+
+		sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
+		if (!sensor)
+			return -ENOMEM;
+
+		sensor->resource_id = resource_id[i];
+
+		sensor->tzd = devm_thermal_of_zone_register(&pdev->dev, sensor->resource_id,
+							    sensor, &imx_sc_thermal_ops);
+		if (IS_ERR(sensor->tzd)) {
+			/*
+			 * Save the error value before freeing the
+			 * sensor pointer, otherwise we endup with a
+			 * use-after-free error
+			 */
+			ret = PTR_ERR(sensor->tzd);
+
+			devm_kfree(&pdev->dev, sensor);
+
+			/*
+			 * The thermal framework notifies us there is
+			 * no thermal zone description for such a
+			 * sensor id
+			 */
+			if (ret == -ENODEV)
+				continue;
+
+			dev_err(&pdev->dev, "failed to register thermal zone\n");
+			return ret;
+		}
+
+		if (devm_thermal_add_hwmon_sysfs(sensor->tzd))
+			dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n");
+	}
+
+	return 0;
+}
+
+static const int imx_sc_sensors[] = { IMX_SC_R_SYSTEM, IMX_SC_R_PMIC_0, -1 };
+
+static const struct of_device_id imx_sc_thermal_table[] = {
+	{ .compatible = "fsl,imx-sc-thermal", .data =  imx_sc_sensors },
+	{}
+};
+MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
+
+static struct platform_driver imx_sc_thermal_driver = {
+		.probe = imx_sc_thermal_probe,
+		.driver = {
+			.name = "imx-sc-thermal",
+			.of_match_table = imx_sc_thermal_table,
+		},
+};
+module_platform_driver(imx_sc_thermal_driver);
+
+MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
+MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
+MODULE_LICENSE("GPL v2");