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 <log.h>
  11 #include <thermal.h>
  12 #include <dm/device-internal.h>
  13 #include <dm/device.h>
  14 #include <asm/arch/sci/sci.h>
  15 #include <linux/delay.h>
  16 #include <linux/libfdt.h>
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 struct imx_sc_thermal_plat {
  21         int critical;
  22         int alert;
  23         int polling_delay;
  24         int id;
  25         bool zone_node;
  26 };
  27
  28 static int read_temperature(struct udevice *dev, int *temp)
  29 {
  30         s16 celsius;
  31         s8 tenths;
  32         int ret;
  33
  34         sc_rsrc_t *sensor_rsrc = (sc_rsrc_t *)dev_get_driver_data(dev);
  35
  36         struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);
  37
  38         if (!temp)
  39                 return -EINVAL;
  40
  41         ret = sc_misc_get_temp(-1, sensor_rsrc[pdata->id], SC_C_TEMP,
  42                                &celsius, &tenths);
  43         if (ret) {
  44                 printf("Error: get temperature failed! (error = %d)\n", ret);
  45                 return ret;
  46         }
  47
  48         *temp = celsius * 1000 + tenths * 100;
  49
  50         return 0;
  51 }
  52
  53 int imx_sc_thermal_get_temp(struct udevice *dev, int *temp)
  54 {
  55         struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);
  56         int cpu_temp = 0;
  57         int ret;
  58
  59         ret = read_temperature(dev, &cpu_temp);
  60         if (ret)
  61                 return ret;
  62
  63         while (cpu_temp >= pdata->alert) {
  64                 printf("CPU Temperature (%dC) beyond alert (%dC), close to critical (%dC)",
  65                        cpu_temp, pdata->alert, pdata->critical);
  66                 puts(" waiting...\n");
  67                 mdelay(pdata->polling_delay);
  68                 ret = read_temperature(dev, &cpu_temp);
  69                 if (ret)
  70                         return ret;
  71                 if (cpu_temp >= pdata->alert && !pdata->alert)
  72                         break;
  73         }
  74
  75         *temp = cpu_temp / 1000;
  76
  77         return 0;
  78 }
  79
  80 static const struct dm_thermal_ops imx_sc_thermal_ops = {
  81         .get_temp       = imx_sc_thermal_get_temp,
  82 };
  83
  84 static int imx_sc_thermal_probe(struct udevice *dev)
  85 {
  86         debug("%s dev name %s\n", __func__, dev->name);
  87         return 0;
  88 }
  89
  90 static int imx_sc_thermal_bind(struct udevice *dev)
  91 {
  92         struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);
  93         int reg, ret;
  94         int offset;
  95         const char *name;
  96         const void *prop;
  97
  98         debug("%s dev name %s\n", __func__, dev->name);
  99
 100         prop = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), "compatible",
 101                            NULL);
 102         if (!prop)
 103                 return 0;
 104
 105         pdata->zone_node = 1;
 106
 107         reg = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "tsens-num", 0);
 108         if (reg == 0) {
 109                 printf("%s: no temp sensor number provided!\n", __func__);
 110                 return -EINVAL;
 111         }
 112
 113         offset = fdt_subnode_offset(gd->fdt_blob, 0, "thermal-zones");
 114         fdt_for_each_subnode(offset, gd->fdt_blob, offset) {
 115                 /* Bind the subnode to this driver */
 116                 name = fdt_get_name(gd->fdt_blob, offset, NULL);
 117
 118                 ret = device_bind_with_driver_data(dev, dev->driver, name,
 119                                                    dev->driver_data,
 120                                                    offset_to_ofnode(offset),
 121                                                    NULL);
 122                 if (ret)
 123                         printf("Error binding driver '%s': %d\n",
 124                                dev->driver->name, ret);
 125         }
 126         return 0;
 127 }
 128
 129 static int imx_sc_thermal_ofdata_to_platdata(struct udevice *dev)
 130 {
 131         struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);
 132         struct fdtdec_phandle_args args;
 133         const char *type;
 134         int ret;
 135         int trips_np;
 136
 137         debug("%s dev name %s\n", __func__, dev->name);
 138
 139         if (pdata->zone_node)
 140                 return 0;
 141
 142         ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev),
 143                                              "thermal-sensors",
 144                                              "#thermal-sensor-cells",
 145                                              0, 0, &args);
 146         if (ret)
 147                 return ret;
 148
 149         if (args.node != dev_of_offset(dev->parent))
 150                 return -EFAULT;
 151
 152         if (args.args_count >= 1)
 153                 pdata->id = args.args[0];
 154         else
 155                 pdata->id = 0;
 156
 157         debug("args.args_count %d, id %d\n", args.args_count, pdata->id);
 158
 159         pdata->polling_delay = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
 160                                               "polling-delay", 1000);
 161
 162         trips_np = fdt_subnode_offset(gd->fdt_blob, dev_of_offset(dev),
 163                                       "trips");
 164         fdt_for_each_subnode(trips_np, gd->fdt_blob, trips_np) {
 165                 type = fdt_getprop(gd->fdt_blob, trips_np, "type", NULL);
 166                 if (type) {
 167                         if (strcmp(type, "critical") == 0) {
 168                                 pdata->critical = fdtdec_get_int(gd->fdt_blob,
 169                                                                  trips_np,
 170                                                                  "temperature",
 171                                                                  85);
 172                         } else if (strcmp(type, "passive") == 0) {
 173                                 pdata->alert = fdtdec_get_int(gd->fdt_blob,
 174                                                               trips_np,
 175                                                               "temperature",
 176                                                               80);
 177                         }
 178                 }
 179         }
 180
 181         debug("id %d polling_delay %d, critical %d, alert %d\n", pdata->id,
 182               pdata->polling_delay, pdata->critical, pdata->alert);
 183
 184         return 0;
 185 }
 186
 187 static const sc_rsrc_t imx8qm_sensor_rsrc[] = {
 188         SC_R_A53, SC_R_A72, SC_R_GPU_0_PID0, SC_R_GPU_1_PID0,
 189         SC_R_DRC_0, SC_R_DRC_1, SC_R_VPU_PID0, SC_R_PMIC_0,
 190         SC_R_PMIC_1, SC_R_PMIC_2,
 191 };
 192
 193 static const sc_rsrc_t imx8qxp_sensor_rsrc[] = {
 194         SC_R_SYSTEM, SC_R_DRC_0, SC_R_PMIC_0,
 195         SC_R_PMIC_1, SC_R_PMIC_2,
 196 };
 197
 198 static const struct udevice_id imx_sc_thermal_ids[] = {
 199         { .compatible = "nxp,imx8qm-sc-tsens", .data =
 200                 (ulong)&imx8qm_sensor_rsrc, },
 201         { .compatible = "nxp,imx8qxp-sc-tsens", .data =
 202                 (ulong)&imx8qxp_sensor_rsrc, },
 203         { }
 204 };
 205
 206 U_BOOT_DRIVER(imx_sc_thermal) = {
 207         .name   = "imx_sc_thermal",
 208         .id     = UCLASS_THERMAL,
 209         .ops    = &imx_sc_thermal_ops,
 210         .of_match = imx_sc_thermal_ids,
 211         .bind = imx_sc_thermal_bind,
 212         .probe  = imx_sc_thermal_probe,
 213         .ofdata_to_platdata = imx_sc_thermal_ofdata_to_platdata,
 214         .platdata_auto  = sizeof(struct imx_sc_thermal_plat),
 215         .flags  = DM_FLAG_PRE_RELOC,
 216 };