| /* |
| * 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; |
| |
| 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 *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; |
| |
| 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; |
| 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 = "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"); |