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