MLK-14972-02 driver: thermal: Add i.MX8QM/QXP thermal support

Add i.MX8QM/QXP thermal driver support.

Signed-off-by: Bai Ping <ping.bai@nxp.com>

drivers/thermal/Kconfig

@@ -195,6 +195,15 @@ config IMX_THERMAL
 	  cpufreq is used as the cooling device to throttle CPUs when the
 	  passive trip is crossed.
 
+config IMX_SC_THERMAL
+	tristate "thermal sensor driver for NXP i.MX8 SoCs"
+	depends on THERMAL_OF && ARCH_MXC_ARM64
+	help
+	  Support for Temperature Monitor (TEMPMON) found on NXP i.MX SOCs
+	  with system controller.
+	  cpufreq is used as the cooling device to throttle CPUs when the
+	  passive trip is crossed.
+
 config MAX77620_THERMAL
 	tristate "Temperature sensor driver for Maxim MAX77620 PMIC"
 	depends on MFD_MAX77620

drivers/thermal/Makefile

@@ -37,6 +37,7 @@ obj-$(CONFIG_DB8500_THERMAL)	+= db8500_thermal.o
 obj-$(CONFIG_ARMADA_THERMAL)	+= armada_thermal.o
 obj-$(CONFIG_TANGO_THERMAL)	+= tango_thermal.o
 obj-$(CONFIG_IMX_THERMAL)	+= imx_thermal.o
+obj-$(CONFIG_IMX_SC_THERMAL)	+= imx_sc_thermal.o
 obj-$(CONFIG_MAX77620_THERMAL)	+= max77620_thermal.o
 obj-$(CONFIG_QORIQ_THERMAL)	+= qoriq_thermal.o
 obj-$(CONFIG_DEVICE_THERMAL)	+= device_cooling.o

drivers/thermal/imx_sc_thermal.c

@@ -0,0 +1,169 @@
+/*
+ * Copyright 2017 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/platform_device.h>
+#include <linux/pm.h>
+#include <linux/slab.h>
+#include <linux/thermal.h>
+#include <soc/imx8/sc/sci.h>
+
+struct imx_sc_sensor {
+	struct thermal_zone_device *tzd;
+	sc_rsrc_t hw_id;
+};
+
+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_DRC_1, SC_R_VPU_PID0, SC_R_PMIC_0,
+	SC_R_PMIC_1, SC_R_PMIC_2,
+};
+
+static const sc_rsrc_t imx8qxp_sensor_hw_id[] = {
+	SC_R_DRC_0,
+};
+
+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 A53 CPU domain instead.
+	 */
+	if (sciErr != SC_ERR_NONE) {
+		sciErr = sc_misc_get_temp(tsens_ipcHandle, sensor_hw_id[0],
+				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;
+
+	return 0;
+}
+
+static int imx_sc_tsens_get_trend(void *p, int trip, enum thermal_trend *trend)
+{
+	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,
+};
+
+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 *np = pdev->dev.of_node;
+	struct imx_sc_tsens_device *tsens_dev;
+	struct imx_sc_sensor *sensor;
+	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;
+
+	for (sensor_id = 0; sensor_id < tsens_num; sensor_id++) {
+		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;
+	}
+
+	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 = "i.MX-sc-tsens",
+			.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");