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