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1// SPDX-License-Identifier: GPL-2.0+2/*3 * Copyright 2018-2020 NXP.4 */5 6#include <dt-bindings/firmware/imx/rsrc.h>7#include <linux/err.h>8#include <linux/firmware/imx/sci.h>9#include <linux/module.h>10#include <linux/of.h>11#include <linux/platform_device.h>12#include <linux/slab.h>13#include <linux/thermal.h>14 15#include "thermal_hwmon.h"16 17#define IMX_SC_MISC_FUNC_GET_TEMP 1318 19static struct imx_sc_ipc *thermal_ipc_handle;20 21struct imx_sc_sensor {22 struct thermal_zone_device *tzd;23 u32 resource_id;24};25 26struct req_get_temp {27 u16 resource_id;28 u8 type;29} __packed __aligned(4);30 31struct resp_get_temp {32 s16 celsius;33 s8 tenths;34} __packed __aligned(4);35 36struct imx_sc_msg_misc_get_temp {37 struct imx_sc_rpc_msg hdr;38 union {39 struct req_get_temp req;40 struct resp_get_temp resp;41 } data;42} __packed __aligned(4);43 44static int imx_sc_thermal_get_temp(struct thermal_zone_device *tz, int *temp)45{46 struct imx_sc_msg_misc_get_temp msg;47 struct imx_sc_rpc_msg *hdr = &msg.hdr;48 struct imx_sc_sensor *sensor = thermal_zone_device_priv(tz);49 int ret;50 51 msg.data.req.resource_id = sensor->resource_id;52 msg.data.req.type = IMX_SC_C_TEMP;53 54 hdr->ver = IMX_SC_RPC_VERSION;55 hdr->svc = IMX_SC_RPC_SVC_MISC;56 hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;57 hdr->size = 2;58 59 ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);60 if (ret)61 return ret;62 63 *temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;64 65 return 0;66}67 68static const struct thermal_zone_device_ops imx_sc_thermal_ops = {69 .get_temp = imx_sc_thermal_get_temp,70};71 72static int imx_sc_thermal_probe(struct platform_device *pdev)73{74 struct imx_sc_sensor *sensor;75 const int *resource_id;76 int i, ret;77 78 ret = imx_scu_get_handle(&thermal_ipc_handle);79 if (ret)80 return ret;81 82 resource_id = of_device_get_match_data(&pdev->dev);83 if (!resource_id)84 return -EINVAL;85 86 for (i = 0; resource_id[i] >= 0; i++) {87 88 sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);89 if (!sensor)90 return -ENOMEM;91 92 sensor->resource_id = resource_id[i];93 94 sensor->tzd = devm_thermal_of_zone_register(&pdev->dev, sensor->resource_id,95 sensor, &imx_sc_thermal_ops);96 if (IS_ERR(sensor->tzd)) {97 /*98 * Save the error value before freeing the99 * sensor pointer, otherwise we endup with a100 * use-after-free error101 */102 ret = PTR_ERR(sensor->tzd);103 104 devm_kfree(&pdev->dev, sensor);105 106 /*107 * The thermal framework notifies us there is108 * no thermal zone description for such a109 * sensor id110 */111 if (ret == -ENODEV)112 continue;113 114 return dev_err_probe(&pdev->dev, ret, "failed to register thermal zone\n");115 }116 117 devm_thermal_add_hwmon_sysfs(&pdev->dev, sensor->tzd);118 }119 120 return 0;121}122 123static const int imx_sc_sensors[] = {124 IMX_SC_R_SYSTEM, IMX_SC_R_PMIC_0,125 IMX_SC_R_AP_0, IMX_SC_R_AP_1,126 IMX_SC_R_GPU_0_PID0, IMX_SC_R_GPU_1_PID0,127 IMX_SC_R_DRC_0, -1 };128 129static const struct of_device_id imx_sc_thermal_table[] = {130 { .compatible = "fsl,imx-sc-thermal", .data = imx_sc_sensors },131 {}132};133MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);134 135static struct platform_driver imx_sc_thermal_driver = {136 .probe = imx_sc_thermal_probe,137 .driver = {138 .name = "imx-sc-thermal",139 .of_match_table = imx_sc_thermal_table,140 },141};142module_platform_driver(imx_sc_thermal_driver);143 144MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");145MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");146MODULE_LICENSE("GPL v2");147