1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright 2018-2020 NXP. 4 */ 5 6 #include <linux/err.h> 7 #include <linux/firmware/imx/sci.h> 8 #include <linux/firmware/imx/types.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_core.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(void *data, 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 = data; 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 dev_err(&sensor->tzd->device, "read temp sensor %d failed, ret %d\n", 63 sensor->resource_id, ret); 64 return ret; 65 } 66 67 *temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100; 68 69 return 0; 70 } 71 72 static const struct thermal_zone_of_device_ops imx_sc_thermal_ops = { 73 .get_temp = imx_sc_thermal_get_temp, 74 }; 75 76 static int imx_sc_thermal_probe(struct platform_device *pdev) 77 { 78 struct device_node *np, *child, *sensor_np; 79 struct imx_sc_sensor *sensor; 80 int ret; 81 82 ret = imx_scu_get_handle(&thermal_ipc_handle); 83 if (ret) 84 return ret; 85 86 np = of_find_node_by_name(NULL, "thermal-zones"); 87 if (!np) 88 return -ENODEV; 89 90 sensor_np = of_node_get(pdev->dev.of_node); 91 92 for_each_available_child_of_node(np, child) { 93 sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL); 94 if (!sensor) { 95 of_node_put(sensor_np); 96 return -ENOMEM; 97 } 98 99 ret = thermal_zone_of_get_sensor_id(child, 100 sensor_np, 101 &sensor->resource_id); 102 if (ret < 0) { 103 dev_err(&pdev->dev, 104 "failed to get valid sensor resource id: %d\n", 105 ret); 106 break; 107 } 108 109 sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev, 110 sensor->resource_id, 111 sensor, 112 &imx_sc_thermal_ops); 113 if (IS_ERR(sensor->tzd)) { 114 dev_err(&pdev->dev, "failed to register thermal zone\n"); 115 ret = PTR_ERR(sensor->tzd); 116 break; 117 } 118 } 119 120 of_node_put(sensor_np); 121 122 return ret; 123 } 124 125 static int imx_sc_thermal_remove(struct platform_device *pdev) 126 { 127 return 0; 128 } 129 130 static const struct of_device_id imx_sc_thermal_table[] = { 131 { .compatible = "fsl,imx-sc-thermal", }, 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 .remove = imx_sc_thermal_remove, 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