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1// SPDX-License-Identifier: GPL-2.0+2/*3 * Amlogic Thermal Sensor Driver4 *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 * U10 * U = ---------, Uptat = ---------11 * 2^16 1 + n * U12 *13 * Temperature = A * ( Uptat + u_efuse / 2^16 )- B14 *15 * A B m n : calibration parameters16 * u_efuse : fused calibration value, it's a signed 16 bits value17 */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 0x432 #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 0x4048 49#define TSENSOR_STAT9 0x6450 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 164#define TSENSOR_CALIB_SHIFT 465 66/**67 * struct amlogic_thermal_soc_calib_data68 * @A: calibration parameters69 * @B: calibration parameters70 * @m: calibration parameters71 * @n: calibration parameters72 *73 * This structure is required for configuration of amlogic thermal driver.74 */75struct amlogic_thermal_soc_calib_data {76 int A;77 int B;78 int m;79 int n;80};81 82/**83 * struct amlogic_thermal_data84 * @u_efuse_off: register offset to read fused calibration value85 * @calibration_parameters: calibration parameters structure pointer86 * @regmap_config: regmap config for the device87 * This structure is required for configuration of amlogic thermal driver.88 */89struct 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 95struct 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 */109static 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 136static 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 156static 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 170static 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 177static 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 193static const struct thermal_zone_device_ops amlogic_thermal_ops = {194 .get_temp = amlogic_thermal_get_temp,195};196 197static 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 204static const struct amlogic_thermal_soc_calib_data amlogic_thermal_g12a = {205 .A = 9411,206 .B = 3159,207 .m = 424,208 .n = 324,209};210 211static 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 217static 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 223static 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 229static 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};244MODULE_DEVICE_TABLE(of, of_amlogic_thermal_match);245 246static 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_phandle275 (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 302static 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 309static 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 318static 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 325static DEFINE_SIMPLE_DEV_PM_OPS(amlogic_thermal_pm_ops,326 amlogic_thermal_suspend,327 amlogic_thermal_resume);328 329static 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_new = amlogic_thermal_remove,337};338 339module_platform_driver(amlogic_thermal_driver);340 341MODULE_AUTHOR("Guillaume La Roque <glaroque@baylibre.com>");342MODULE_DESCRIPTION("Amlogic thermal driver");343MODULE_LICENSE("GPL v2");344