drivers/thermal/imx_scu_thermal.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2019 NXP
   4  */
   5
   6 #include <config.h>
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <errno.h>
  10 #include <thermal.h>
  11 #include <dm/device-internal.h>
  12 #include <dm/device.h>
  13 #include <asm/arch/sci/sci.h>
  14 #include <linux/libfdt.h>
  15
  16 DECLARE_GLOBAL_DATA_PTR;
  17
  18 struct imx_sc_thermal_plat {
  19         int critical;
  20         int alert;
  21         int polling_delay;
  22         int id;
  23         bool zone_node;
  24 };
  25
  26 static int read_temperature(struct udevice *dev, int *temp)
  27 {
  28         s16 celsius;
  29         s8 tenths;
  30         int ret;
  31
  32         sc_rsrc_t *sensor_rsrc = (sc_rsrc_t *)dev_get_driver_data(dev);
  33
  34         struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);
  35
  36         if (!temp)
  37                 return -EINVAL;
  38
  39         ret = sc_misc_get_temp(-1, sensor_rsrc[pdata->id], SC_C_TEMP,
  40                                &celsius, &tenths);
  41         if (ret) {
  42                 printf("Error: get temperature failed! (error = %d)\n", ret);
  43                 return ret;
  44         }
  45
  46         *temp = celsius * 1000 + tenths * 100;
  47
  48         return 0;
  49 }
  50
  51 int imx_sc_thermal_get_temp(struct udevice *dev, int *temp)
  52 {
  53         struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);
  54         int cpu_temp = 0;
  55         int ret;
  56
  57         ret = read_temperature(dev, &cpu_temp);
  58         if (ret)
  59                 return ret;
  60
  61         while (cpu_temp >= pdata->alert) {
  62                 printf("CPU Temperature (%dC) has beyond alert (%dC), close to critical (%dC)",
  63                        cpu_temp, pdata->alert, pdata->critical);
  64                 puts(" waiting...\n");
  65                 mdelay(pdata->polling_delay);
  66                 ret = read_temperature(dev, &cpu_temp);
  67                 if (ret)
  68                         return ret;
  69         }
  70
  71         *temp = cpu_temp / 1000;
  72
  73         return 0;
  74 }
  75
  76 static const struct dm_thermal_ops imx_sc_thermal_ops = {
  77         .get_temp       = imx_sc_thermal_get_temp,
  78 };
  79
  80 static int imx_sc_thermal_probe(struct udevice *dev)
  81 {
  82         debug("%s dev name %s\n", __func__, dev->name);
  83         return 0;
  84 }
  85
  86 static int imx_sc_thermal_bind(struct udevice *dev)
  87 {
  88         struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);
  89         int reg, ret;
  90         int offset;
  91         const char *name;
  92         const void *prop;
  93
  94         debug("%s dev name %s\n", __func__, dev->name);
  95
  96         prop = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), "compatible",
  97                            NULL);
  98         if (!prop)
  99                 return 0;
 100
 101         pdata->zone_node = 1;
 102
 103         reg = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "tsens-num", 0);
 104         if (reg == 0) {
 105                 printf("%s: no temp sensor number provided!\n", __func__);
 106                 return -EINVAL;
 107         }
 108
 109         offset = fdt_subnode_offset(gd->fdt_blob, 0, "thermal-zones");
 110         fdt_for_each_subnode(offset, gd->fdt_blob, offset) {
 111                 /* Bind the subnode to this driver */
 112                 name = fdt_get_name(gd->fdt_blob, offset, NULL);
 113
 114                 ret = device_bind_with_driver_data(dev, dev->driver, name,
 115                                                    dev->driver_data,
 116                                                    offset_to_ofnode(offset),
 117                                                    NULL);
 118                 if (ret)
 119                         printf("Error binding driver '%s': %d\n",
 120                                dev->driver->name, ret);
 121         }
 122         return 0;
 123 }
 124
 125 static int imx_sc_thermal_ofdata_to_platdata(struct udevice *dev)
 126 {
 127         struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);
 128         struct fdtdec_phandle_args args;
 129         const char *type;
 130         int ret;
 131         int trips_np;
 132
 133         debug("%s dev name %s\n", __func__, dev->name);
 134
 135         if (pdata->zone_node)
 136                 return 0;
 137
 138         ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev),
 139                                              "thermal-sensors",
 140                                              "#thermal-sensor-cells",
 141                                              0, 0, &args);
 142         if (ret)
 143                 return ret;
 144
 145         if (args.node != dev_of_offset(dev->parent))
 146                 return -EFAULT;
 147
 148         if (args.args_count >= 1)
 149                 pdata->id = args.args[0];
 150         else
 151                 pdata->id = 0;
 152
 153         debug("args.args_count %d, id %d\n", args.args_count, pdata->id);
 154
 155         pdata->polling_delay = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
 156                                               "polling-delay", 1000);
 157
 158         trips_np = fdt_subnode_offset(gd->fdt_blob, dev_of_offset(dev),
 159                                       "trips");
 160         fdt_for_each_subnode(trips_np, gd->fdt_blob, trips_np) {
 161                 type = fdt_getprop(gd->fdt_blob, trips_np, "type", NULL);
 162                 if (type) {
 163                         if (strcmp(type, "critical") == 0) {
 164                                 pdata->critical = fdtdec_get_int(gd->fdt_blob,
 165                                                                  trips_np,
 166                                                                  "temperature",
 167                                                                  85);
 168                         } else if (strcmp(type, "passive") == 0) {
 169                                 pdata->alert = fdtdec_get_int(gd->fdt_blob,
 170                                                               trips_np,
 171                                                               "temperature",
 172                                                               80);
 173                         }
 174                 }
 175         }
 176
 177         debug("id %d polling_delay %d, critical %d, alert %d\n", pdata->id,
 178               pdata->polling_delay, pdata->critical, pdata->alert);
 179
 180         return 0;
 181 }
 182
 183 static const sc_rsrc_t imx8qm_sensor_rsrc[] = {
 184         SC_R_A53, SC_R_A72, SC_R_GPU_0_PID0, SC_R_GPU_1_PID0,
 185         SC_R_DRC_0, SC_R_DRC_1, SC_R_VPU_PID0, SC_R_PMIC_0,
 186         SC_R_PMIC_1, SC_R_PMIC_2,
 187 };
 188
 189 static const sc_rsrc_t imx8qxp_sensor_rsrc[] = {
 190         SC_R_SYSTEM, SC_R_DRC_0, SC_R_PMIC_0,
 191         SC_R_PMIC_1, SC_R_PMIC_2,
 192 };
 193
 194 static const struct udevice_id imx_sc_thermal_ids[] = {
 195         { .compatible = "nxp,imx8qm-sc-tsens", .data =
 196                 (ulong)&imx8qm_sensor_rsrc, },
 197         { .compatible = "nxp,imx8qxp-sc-tsens", .data =
 198                 (ulong)&imx8qxp_sensor_rsrc, },
 199         { }
 200 };
 201
 202 U_BOOT_DRIVER(imx_sc_thermal) = {
 203         .name   = "imx_sc_thermal",
 204         .id     = UCLASS_THERMAL,
 205         .ops    = &imx_sc_thermal_ops,
 206         .of_match = imx_sc_thermal_ids,
 207         .bind = imx_sc_thermal_bind,
 208         .probe  = imx_sc_thermal_probe,
 209         .ofdata_to_platdata = imx_sc_thermal_ofdata_to_platdata,
 210         .platdata_auto_alloc_size = sizeof(struct imx_sc_thermal_plat),
 211         .flags  = DM_FLAG_PRE_RELOC,
 212 };