drivers/thermal/imx_sc_thermal.c

   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 = tz->devdata;
  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_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 imx_sc_sensor *sensor;
  79         const int *resource_id;
  80         int i, ret;
  81
  82         ret = imx_scu_get_handle(&thermal_ipc_handle);
  83         if (ret)
  84                 return ret;
  85
  86         resource_id = of_device_get_match_data(&pdev->dev);
  87         if (!resource_id)
  88                 return -EINVAL;
  89
  90         for (i = 0; resource_id[i] >= 0; i++) {
  91
  92                 sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
  93                 if (!sensor)
  94                         return -ENOMEM;
  95
  96                 sensor->resource_id = resource_id[i];
  97
  98                 sensor->tzd = devm_thermal_of_zone_register(&pdev->dev, sensor->resource_id,
  99                                                             sensor, &imx_sc_thermal_ops);
 100                 if (IS_ERR(sensor->tzd)) {
 101                         /*
 102                          * Save the error value before freeing the
 103                          * sensor pointer, otherwise we endup with a
 104                          * use-after-free error
 105                          */
 106                         ret = PTR_ERR(sensor->tzd);
 107
 108                         devm_kfree(&pdev->dev, sensor);
 109
 110                         /*
 111                          * The thermal framework notifies us there is
 112                          * no thermal zone description for such a
 113                          * sensor id
 114                          */
 115                         if (ret == -ENODEV)
 116                                 continue;
 117
 118                         dev_err(&pdev->dev, "failed to register thermal zone\n");
 119                         return ret;
 120                 }
 121
 122                 if (devm_thermal_add_hwmon_sysfs(sensor->tzd))
 123                         dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n");
 124         }
 125
 126         return 0;
 127 }
 128
 129 static const int imx_sc_sensors[] = {
 130         IMX_SC_R_SYSTEM, IMX_SC_R_PMIC_0,
 131         IMX_SC_R_AP_0, IMX_SC_R_AP_1,
 132         IMX_SC_R_GPU_0_PID0, IMX_SC_R_GPU_1_PID0,
 133         IMX_SC_R_DRC_0, -1 };
 134
 135 static const struct of_device_id imx_sc_thermal_table[] = {
 136         { .compatible = "fsl,imx-sc-thermal", .data =  imx_sc_sensors },
 137         {}
 138 };
 139 MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
 140
 141 static struct platform_driver imx_sc_thermal_driver = {
 142                 .probe = imx_sc_thermal_probe,
 143                 .driver = {
 144                         .name = "imx-sc-thermal",
 145                         .of_match_table = imx_sc_thermal_table,
 146                 },
 147 };
 148 module_platform_driver(imx_sc_thermal_driver);
 149
 150 MODULE_AUTHOR("Anson Huang <[email protected]>");
 151 MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
 152 MODULE_LICENSE("GPL v2");