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 13 18 19 static struct imx_sc_ipc *thermal_ipc_handle; 20 21 struct imx_sc_sensor { 22 struct thermal_zone_device *tzd; 23 u32 resource_id; 24 }; 25 26 struct req_get_temp { 27 u16 resource_id; 28 u8 type; 29 } __packed __aligned(4); 30 31 struct resp_get_temp { 32 s16 celsius; 33 s8 tenths; 34 } __packed __aligned(4); 35 36 struct 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 44 static 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 68 static const struct thermal_zone_device_ops imx_sc_thermal_ops = { 69 .get_temp = imx_sc_thermal_get_temp, 70 }; 71 72 static 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 the 99 * sensor pointer, otherwise we endup with a 100 * use-after-free error 101 */ 102 ret = PTR_ERR(sensor->tzd); 103 104 devm_kfree(&pdev->dev, sensor); 105 106 /* 107 * The thermal framework notifies us there is 108 * no thermal zone description for such a 109 * sensor id 110 */ 111 if (ret == -ENODEV) 112 continue; 113 114 dev_err(&pdev->dev, "failed to register thermal zone\n"); 115 return ret; 116 } 117 118 devm_thermal_add_hwmon_sysfs(&pdev->dev, sensor->tzd); 119 } 120 121 return 0; 122 } 123 124 static const int imx_sc_sensors[] = { 125 IMX_SC_R_SYSTEM, IMX_SC_R_PMIC_0, 126 IMX_SC_R_AP_0, IMX_SC_R_AP_1, 127 IMX_SC_R_GPU_0_PID0, IMX_SC_R_GPU_1_PID0, 128 IMX_SC_R_DRC_0, -1 }; 129 130 static const struct of_device_id imx_sc_thermal_table[] = { 131 { .compatible = "fsl,imx-sc-thermal", .data = imx_sc_sensors }, 132 {} 133 }; 134 MODULE_DEVICE_TABLE(of, imx_sc_thermal_table); 135 136 static struct platform_driver imx_sc_thermal_driver = { 137 .probe = imx_sc_thermal_probe, 138 .driver = { 139 .name = "imx-sc-thermal", 140 .of_match_table = imx_sc_thermal_table, 141 }, 142 }; 143 module_platform_driver(imx_sc_thermal_driver); 144 145 MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>"); 146 MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller"); 147 MODULE_LICENSE("GPL v2"); 148