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/of_device.h> 12 #include <linux/platform_device.h> 13 #include <linux/slab.h> 14 #include <linux/thermal.h> 15 16 #include "thermal_hwmon.h" 17 18 #define IMX_SC_MISC_FUNC_GET_TEMP 13 19 20 static struct imx_sc_ipc *thermal_ipc_handle; 21 22 struct imx_sc_sensor { 23 struct thermal_zone_device *tzd; 24 u32 resource_id; 25 }; 26 27 struct req_get_temp { 28 u16 resource_id; 29 u8 type; 30 } __packed __aligned(4); 31 32 struct resp_get_temp { 33 s16 celsius; 34 s8 tenths; 35 } __packed __aligned(4); 36 37 struct imx_sc_msg_misc_get_temp { 38 struct imx_sc_rpc_msg hdr; 39 union { 40 struct req_get_temp req; 41 struct resp_get_temp resp; 42 } data; 43 } __packed __aligned(4); 44 45 static int imx_sc_thermal_get_temp(struct thermal_zone_device *tz, int *temp) 46 { 47 struct imx_sc_msg_misc_get_temp msg; 48 struct imx_sc_rpc_msg *hdr = &msg.hdr; 49 struct imx_sc_sensor *sensor = thermal_zone_device_priv(tz); 50 int ret; 51 52 msg.data.req.resource_id = sensor->resource_id; 53 msg.data.req.type = IMX_SC_C_TEMP; 54 55 hdr->ver = IMX_SC_RPC_VERSION; 56 hdr->svc = IMX_SC_RPC_SVC_MISC; 57 hdr->func = IMX_SC_MISC_FUNC_GET_TEMP; 58 hdr->size = 2; 59 60 ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true); 61 if (ret) 62 return ret; 63 64 *temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100; 65 66 return 0; 67 } 68 69 static const struct thermal_zone_device_ops imx_sc_thermal_ops = { 70 .get_temp = imx_sc_thermal_get_temp, 71 }; 72 73 static int imx_sc_thermal_probe(struct platform_device *pdev) 74 { 75 struct imx_sc_sensor *sensor; 76 const int *resource_id; 77 int i, ret; 78 79 ret = imx_scu_get_handle(&thermal_ipc_handle); 80 if (ret) 81 return ret; 82 83 resource_id = of_device_get_match_data(&pdev->dev); 84 if (!resource_id) 85 return -EINVAL; 86 87 for (i = 0; resource_id[i] >= 0; i++) { 88 89 sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL); 90 if (!sensor) 91 return -ENOMEM; 92 93 sensor->resource_id = resource_id[i]; 94 95 sensor->tzd = devm_thermal_of_zone_register(&pdev->dev, sensor->resource_id, 96 sensor, &imx_sc_thermal_ops); 97 if (IS_ERR(sensor->tzd)) { 98 /* 99 * Save the error value before freeing the 100 * sensor pointer, otherwise we endup with a 101 * use-after-free error 102 */ 103 ret = PTR_ERR(sensor->tzd); 104 105 devm_kfree(&pdev->dev, sensor); 106 107 /* 108 * The thermal framework notifies us there is 109 * no thermal zone description for such a 110 * sensor id 111 */ 112 if (ret == -ENODEV) 113 continue; 114 115 dev_err(&pdev->dev, "failed to register thermal zone\n"); 116 return ret; 117 } 118 119 devm_thermal_add_hwmon_sysfs(&pdev->dev, sensor->tzd); 120 } 121 122 return 0; 123 } 124 125 static const int imx_sc_sensors[] = { 126 IMX_SC_R_SYSTEM, IMX_SC_R_PMIC_0, 127 IMX_SC_R_AP_0, IMX_SC_R_AP_1, 128 IMX_SC_R_GPU_0_PID0, IMX_SC_R_GPU_1_PID0, 129 IMX_SC_R_DRC_0, -1 }; 130 131 static const struct of_device_id imx_sc_thermal_table[] = { 132 { .compatible = "fsl,imx-sc-thermal", .data = imx_sc_sensors }, 133 {} 134 }; 135 MODULE_DEVICE_TABLE(of, imx_sc_thermal_table); 136 137 static struct platform_driver imx_sc_thermal_driver = { 138 .probe = imx_sc_thermal_probe, 139 .driver = { 140 .name = "imx-sc-thermal", 141 .of_match_table = imx_sc_thermal_table, 142 }, 143 }; 144 module_platform_driver(imx_sc_thermal_driver); 145 146 MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>"); 147 MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller"); 148 MODULE_LICENSE("GPL v2"); 149