drivers/thermal/amlogic_thermal.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Amlogic Thermal Sensor Driver
   4  *
   5  * Copyright (C) 2017 Huan Biao <huan.biao@amlogic.com>
   6  * Copyright (C) 2019 Guillaume La Roque <glaroque@baylibre.com>
   7  *
   8  * Register value to celsius temperature formulas:
   9  *      Read_Val            m * U
  10  * U = ---------, Uptat = ---------
  11  *      2^16              1 + n * U
  12  *
  13  * Temperature = A * ( Uptat + u_efuse / 2^16 )- B
  14  *
  15  *  A B m n : calibration parameters
  16  *  u_efuse : fused calibration value, it's a signed 16 bits value
  17  */
  18
  19 #include <linux/bitfield.h>
  20 #include <linux/clk.h>
  21 #include <linux/io.h>
  22 #include <linux/mfd/syscon.h>
  23 #include <linux/module.h>
  24 #include <linux/of.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/regmap.h>
  27 #include <linux/thermal.h>
  28
  29 #include "thermal_hwmon.h"
  30
  31 #define TSENSOR_CFG_REG1                        0x4
  32         #define TSENSOR_CFG_REG1_RSET_VBG       BIT(12)
  33         #define TSENSOR_CFG_REG1_RSET_ADC       BIT(11)
  34         #define TSENSOR_CFG_REG1_VCM_EN         BIT(10)
  35         #define TSENSOR_CFG_REG1_VBG_EN         BIT(9)
  36         #define TSENSOR_CFG_REG1_OUT_CTL        BIT(6)
  37         #define TSENSOR_CFG_REG1_FILTER_EN      BIT(5)
  38         #define TSENSOR_CFG_REG1_DEM_EN         BIT(3)
  39         #define TSENSOR_CFG_REG1_CH_SEL         GENMASK(1, 0)
  40         #define TSENSOR_CFG_REG1_ENABLE         \
  41                 (TSENSOR_CFG_REG1_FILTER_EN |   \
  42                  TSENSOR_CFG_REG1_VCM_EN |      \
  43                  TSENSOR_CFG_REG1_VBG_EN |      \
  44                  TSENSOR_CFG_REG1_DEM_EN |      \
  45                  TSENSOR_CFG_REG1_CH_SEL)
  46
  47 #define TSENSOR_STAT0                   0x40
  48
  49 #define TSENSOR_STAT9                   0x64
  50
  51 #define TSENSOR_READ_TEMP_MASK          GENMASK(15, 0)
  52 #define TSENSOR_TEMP_MASK               GENMASK(11, 0)
  53
  54 #define TSENSOR_TRIM_SIGN_MASK          BIT(15)
  55 #define TSENSOR_TRIM_TEMP_MASK          GENMASK(14, 0)
  56 #define TSENSOR_TRIM_VERSION_MASK       GENMASK(31, 24)
  57
  58 #define TSENSOR_TRIM_VERSION(_version)  \
  59         FIELD_GET(TSENSOR_TRIM_VERSION_MASK, _version)
  60
  61 #define TSENSOR_TRIM_CALIB_VALID_MASK   (GENMASK(3, 2) | BIT(7))
  62
  63 #define TSENSOR_CALIB_OFFSET    1
  64 #define TSENSOR_CALIB_SHIFT     4
  65
  66 /**
  67  * struct amlogic_thermal_soc_calib_data
  68  * @A: calibration parameters
  69  * @B: calibration parameters
  70  * @m: calibration parameters
  71  * @n: calibration parameters
  72  *
  73  * This structure is required for configuration of amlogic thermal driver.
  74  */
  75 struct amlogic_thermal_soc_calib_data {
  76         int A;
  77         int B;
  78         int m;
  79         int n;
  80 };
  81
  82 /**
  83  * struct amlogic_thermal_data
  84  * @u_efuse_off: register offset to read fused calibration value
  85  * @calibration_parameters: calibration parameters structure pointer
  86  * @regmap_config: regmap config for the device
  87  * This structure is required for configuration of amlogic thermal driver.
  88  */
  89 struct amlogic_thermal_data {
  90         int u_efuse_off;
  91         const struct amlogic_thermal_soc_calib_data *calibration_parameters;
  92         const struct regmap_config *regmap_config;
  93 };
  94
  95 struct amlogic_thermal {
  96         struct platform_device *pdev;
  97         const struct amlogic_thermal_data *data;
  98         struct regmap *regmap;
  99         struct regmap *sec_ao_map;
 100         struct clk *clk;
 101         struct thermal_zone_device *tzd;
 102         u32 trim_info;
 103 };
 104
 105 /*
 106  * Calculate a temperature value from a temperature code.
 107  * The unit of the temperature is degree milliCelsius.
 108  */
 109 static int amlogic_thermal_code_to_millicelsius(struct amlogic_thermal *pdata,
 110                                                 int temp_code)
 111 {
 112         const struct amlogic_thermal_soc_calib_data *param =
 113                                         pdata->data->calibration_parameters;
 114         int temp;
 115         s64 factor, Uptat, uefuse;
 116
 117         uefuse = pdata->trim_info & TSENSOR_TRIM_SIGN_MASK ?
 118                              ~(pdata->trim_info & TSENSOR_TRIM_TEMP_MASK) + 1 :
 119                              (pdata->trim_info & TSENSOR_TRIM_TEMP_MASK);
 120
 121         factor = param->n * temp_code;
 122         factor = div_s64(factor, 100);
 123
 124         Uptat = temp_code * param->m;
 125         Uptat = div_s64(Uptat, 100);
 126         Uptat = Uptat * BIT(16);
 127         Uptat = div_s64(Uptat, BIT(16) + factor);
 128
 129         temp = (Uptat + uefuse) * param->A;
 130         temp = div_s64(temp, BIT(16));
 131         temp = (temp - param->B) * 100;
 132
 133         return temp;
 134 }
 135
 136 static int amlogic_thermal_initialize(struct amlogic_thermal *pdata)
 137 {
 138         int ret = 0;
 139         int ver;
 140
 141         regmap_read(pdata->sec_ao_map, pdata->data->u_efuse_off,
 142                     &pdata->trim_info);
 143
 144         ver = TSENSOR_TRIM_VERSION(pdata->trim_info);
 145
 146         if ((ver & TSENSOR_TRIM_CALIB_VALID_MASK) == 0) {
 147                 ret = -EINVAL;
 148                 dev_err(&pdata->pdev->dev,
 149                         "tsensor thermal calibration not supported: 0x%x!\n",
 150                         ver);
 151         }
 152
 153         return ret;
 154 }
 155
 156 static int amlogic_thermal_enable(struct amlogic_thermal *data)
 157 {
 158         int ret;
 159
 160         ret = clk_prepare_enable(data->clk);
 161         if (ret)
 162                 return ret;
 163
 164         regmap_update_bits(data->regmap, TSENSOR_CFG_REG1,
 165                            TSENSOR_CFG_REG1_ENABLE, TSENSOR_CFG_REG1_ENABLE);
 166
 167         return 0;
 168 }
 169
 170 static void amlogic_thermal_disable(struct amlogic_thermal *data)
 171 {
 172         regmap_update_bits(data->regmap, TSENSOR_CFG_REG1,
 173                            TSENSOR_CFG_REG1_ENABLE, 0);
 174         clk_disable_unprepare(data->clk);
 175 }
 176
 177 static int amlogic_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
 178 {
 179         unsigned int tval;
 180         struct amlogic_thermal *pdata = thermal_zone_device_priv(tz);
 181
 182         if (!pdata)
 183                 return -EINVAL;
 184
 185         regmap_read(pdata->regmap, TSENSOR_STAT0, &tval);
 186         *temp =
 187            amlogic_thermal_code_to_millicelsius(pdata,
 188                                                 tval & TSENSOR_READ_TEMP_MASK);
 189
 190         return 0;
 191 }
 192
 193 static const struct thermal_zone_device_ops amlogic_thermal_ops = {
 194         .get_temp       = amlogic_thermal_get_temp,
 195 };
 196
 197 static const struct regmap_config amlogic_thermal_regmap_config_g12a = {
 198         .reg_bits = 8,
 199         .val_bits = 32,
 200         .reg_stride = 4,
 201         .max_register = TSENSOR_STAT9,
 202 };
 203
 204 static const struct amlogic_thermal_soc_calib_data amlogic_thermal_g12a = {
 205         .A = 9411,
 206         .B = 3159,
 207         .m = 424,
 208         .n = 324,
 209 };
 210
 211 static const struct amlogic_thermal_data amlogic_thermal_g12a_cpu_param = {
 212         .u_efuse_off = 0x128,
 213         .calibration_parameters = &amlogic_thermal_g12a,
 214         .regmap_config = &amlogic_thermal_regmap_config_g12a,
 215 };
 216
 217 static const struct amlogic_thermal_data amlogic_thermal_g12a_ddr_param = {
 218         .u_efuse_off = 0xf0,
 219         .calibration_parameters = &amlogic_thermal_g12a,
 220         .regmap_config = &amlogic_thermal_regmap_config_g12a,
 221 };
 222
 223 static const struct amlogic_thermal_data amlogic_thermal_a1_cpu_param = {
 224         .u_efuse_off = 0x114,
 225         .calibration_parameters = &amlogic_thermal_g12a,
 226         .regmap_config = &amlogic_thermal_regmap_config_g12a,
 227 };
 228
 229 static const struct of_device_id of_amlogic_thermal_match[] = {
 230         {
 231                 .compatible = "amlogic,g12a-ddr-thermal",
 232                 .data = &amlogic_thermal_g12a_ddr_param,
 233         },
 234         {
 235                 .compatible = "amlogic,g12a-cpu-thermal",
 236                 .data = &amlogic_thermal_g12a_cpu_param,
 237         },
 238         {
 239                 .compatible = "amlogic,a1-cpu-thermal",
 240                 .data = &amlogic_thermal_a1_cpu_param,
 241         },
 242         { /* sentinel */ }
 243 };
 244 MODULE_DEVICE_TABLE(of, of_amlogic_thermal_match);
 245
 246 static int amlogic_thermal_probe(struct platform_device *pdev)
 247 {
 248         struct amlogic_thermal *pdata;
 249         struct device *dev = &pdev->dev;
 250         void __iomem *base;
 251         int ret;
 252
 253         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 254         if (!pdata)
 255                 return -ENOMEM;
 256
 257         pdata->data = of_device_get_match_data(dev);
 258         pdata->pdev = pdev;
 259         platform_set_drvdata(pdev, pdata);
 260
 261         base = devm_platform_ioremap_resource(pdev, 0);
 262         if (IS_ERR(base))
 263                 return PTR_ERR(base);
 264
 265         pdata->regmap = devm_regmap_init_mmio(dev, base,
 266                                               pdata->data->regmap_config);
 267         if (IS_ERR(pdata->regmap))
 268                 return PTR_ERR(pdata->regmap);
 269
 270         pdata->clk = devm_clk_get(dev, NULL);
 271         if (IS_ERR(pdata->clk))
 272                 return dev_err_probe(dev, PTR_ERR(pdata->clk), "failed to get clock\n");
 273
 274         pdata->sec_ao_map = syscon_regmap_lookup_by_phandle
 275                 (pdev->dev.of_node, "amlogic,ao-secure");
 276         if (IS_ERR(pdata->sec_ao_map)) {
 277                 dev_err(dev, "syscon regmap lookup failed.\n");
 278                 return PTR_ERR(pdata->sec_ao_map);
 279         }
 280
 281         pdata->tzd = devm_thermal_of_zone_register(&pdev->dev,
 282                                                    0,
 283                                                    pdata,
 284                                                    &amlogic_thermal_ops);
 285         if (IS_ERR(pdata->tzd)) {
 286                 ret = PTR_ERR(pdata->tzd);
 287                 dev_err(dev, "Failed to register tsensor: %d\n", ret);
 288                 return ret;
 289         }
 290
 291         devm_thermal_add_hwmon_sysfs(&pdev->dev, pdata->tzd);
 292
 293         ret = amlogic_thermal_initialize(pdata);
 294         if (ret)
 295                 return ret;
 296
 297         ret = amlogic_thermal_enable(pdata);
 298
 299         return ret;
 300 }
 301
 302 static void amlogic_thermal_remove(struct platform_device *pdev)
 303 {
 304         struct amlogic_thermal *data = platform_get_drvdata(pdev);
 305
 306         amlogic_thermal_disable(data);
 307 }
 308
 309 static int amlogic_thermal_suspend(struct device *dev)
 310 {
 311         struct amlogic_thermal *data = dev_get_drvdata(dev);
 312
 313         amlogic_thermal_disable(data);
 314
 315         return 0;
 316 }
 317
 318 static int amlogic_thermal_resume(struct device *dev)
 319 {
 320         struct amlogic_thermal *data = dev_get_drvdata(dev);
 321
 322         return amlogic_thermal_enable(data);
 323 }
 324
 325 static DEFINE_SIMPLE_DEV_PM_OPS(amlogic_thermal_pm_ops,
 326                                 amlogic_thermal_suspend,
 327                                 amlogic_thermal_resume);
 328
 329 static struct platform_driver amlogic_thermal_driver = {
 330         .driver = {
 331                 .name           = "amlogic_thermal",
 332                 .pm             = pm_ptr(&amlogic_thermal_pm_ops),
 333                 .of_match_table = of_amlogic_thermal_match,
 334         },
 335         .probe = amlogic_thermal_probe,
 336         .remove = amlogic_thermal_remove,
 337 };
 338
 339 module_platform_driver(amlogic_thermal_driver);
 340
 341 MODULE_AUTHOR("Guillaume La Roque <glaroque@baylibre.com>");
 342 MODULE_DESCRIPTION("Amlogic thermal driver");
 343 MODULE_LICENSE("GPL v2");