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