--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Amlogic Thermal Sensor Driver
+ *
+ * Copyright (C) 2017 Huan Biao <huan.biao@amlogic.com>
+ * Copyright (C) 2019 Guillaume La Roque <glaroque@baylibre.com>
+ *
+ * Register value to celsius temperature formulas:
+ * Read_Val m * U
+ * U = ---------, Uptat = ---------
+ * 2^16 1 + n * U
+ *
+ * Temperature = A * ( Uptat + u_efuse / 2^16 )- B
+ *
+ * A B m n : calibration parameters
+ * u_efuse : fused calibration value, it's a signed 16 bits value
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/thermal.h>
+
+#include "thermal_core.h"
+
+#define TSENSOR_CFG_REG1 0x4
+ #define TSENSOR_CFG_REG1_RSET_VBG BIT(12)
+ #define TSENSOR_CFG_REG1_RSET_ADC BIT(11)
+ #define TSENSOR_CFG_REG1_VCM_EN BIT(10)
+ #define TSENSOR_CFG_REG1_VBG_EN BIT(9)
+ #define TSENSOR_CFG_REG1_OUT_CTL BIT(6)
+ #define TSENSOR_CFG_REG1_FILTER_EN BIT(5)
+ #define TSENSOR_CFG_REG1_DEM_EN BIT(3)
+ #define TSENSOR_CFG_REG1_CH_SEL GENMASK(1, 0)
+ #define TSENSOR_CFG_REG1_ENABLE \
+ (TSENSOR_CFG_REG1_FILTER_EN | \
+ TSENSOR_CFG_REG1_VCM_EN | \
+ TSENSOR_CFG_REG1_VBG_EN | \
+ TSENSOR_CFG_REG1_DEM_EN | \
+ TSENSOR_CFG_REG1_CH_SEL)
+
+#define TSENSOR_STAT0 0x40
+
+#define TSENSOR_STAT9 0x64
+
+#define TSENSOR_READ_TEMP_MASK GENMASK(15, 0)
+#define TSENSOR_TEMP_MASK GENMASK(11, 0)
+
+#define TSENSOR_TRIM_SIGN_MASK BIT(15)
+#define TSENSOR_TRIM_TEMP_MASK GENMASK(14, 0)
+#define TSENSOR_TRIM_VERSION_MASK GENMASK(31, 24)
+
+#define TSENSOR_TRIM_VERSION(_version) \
+ FIELD_GET(TSENSOR_TRIM_VERSION_MASK, _version)
+
+#define TSENSOR_TRIM_CALIB_VALID_MASK (GENMASK(3, 2) | BIT(7))
+
+#define TSENSOR_CALIB_OFFSET 1
+#define TSENSOR_CALIB_SHIFT 4
+
+/**
+ * struct amlogic_thermal_soc_calib_data
+ * @A, B, m, n: calibration parameters
+ * This structure is required for configuration of amlogic thermal driver.
+ */
+struct amlogic_thermal_soc_calib_data {
+ int A;
+ int B;
+ int m;
+ int n;
+};
+
+/**
+ * struct amlogic_thermal_data
+ * @u_efuse_off: register offset to read fused calibration value
+ * @calibration_parameters: calibration parameters structure pointer
+ * @regmap_config: regmap config for the device
+ * This structure is required for configuration of amlogic thermal driver.
+ */
+struct amlogic_thermal_data {
+ int u_efuse_off;
+ const struct amlogic_thermal_soc_calib_data *calibration_parameters;
+ const struct regmap_config *regmap_config;
+};
+
+struct amlogic_thermal {
+ struct platform_device *pdev;
+ const struct amlogic_thermal_data *data;
+ struct regmap *regmap;
+ struct regmap *sec_ao_map;
+ struct clk *clk;
+ struct thermal_zone_device *tzd;
+ u32 trim_info;
+};
+
+/*
+ * Calculate a temperature value from a temperature code.
+ * The unit of the temperature is degree milliCelsius.
+ */
+static int amlogic_thermal_code_to_millicelsius(struct amlogic_thermal *pdata,
+ int temp_code)
+{
+ const struct amlogic_thermal_soc_calib_data *param =
+ pdata->data->calibration_parameters;
+ int temp;
+ s64 factor, Uptat, uefuse;
+
+ uefuse = pdata->trim_info & TSENSOR_TRIM_SIGN_MASK ?
+ ~(pdata->trim_info & TSENSOR_TRIM_TEMP_MASK) + 1 :
+ (pdata->trim_info & TSENSOR_TRIM_TEMP_MASK);
+
+ factor = param->n * temp_code;
+ factor = div_s64(factor, 100);
+
+ Uptat = temp_code * param->m;
+ Uptat = div_s64(Uptat, 100);
+ Uptat = Uptat * BIT(16);
+ Uptat = div_s64(Uptat, BIT(16) + factor);
+
+ temp = (Uptat + uefuse) * param->A;
+ temp = div_s64(temp, BIT(16));
+ temp = (temp - param->B) * 100;
+
+ return temp;
+}
+
+static int amlogic_thermal_initialize(struct amlogic_thermal *pdata)
+{
+ int ret = 0;
+ int ver;
+
+ regmap_read(pdata->sec_ao_map, pdata->data->u_efuse_off,
+ &pdata->trim_info);
+
+ ver = TSENSOR_TRIM_VERSION(pdata->trim_info);
+
+ if ((ver & TSENSOR_TRIM_CALIB_VALID_MASK) == 0) {
+ ret = -EINVAL;
+ dev_err(&pdata->pdev->dev,
+ "tsensor thermal calibration not supported: 0x%x!\n",
+ ver);
+ }
+
+ return ret;
+}
+
+static int amlogic_thermal_enable(struct amlogic_thermal *data)
+{
+ int ret;
+
+ ret = clk_prepare_enable(data->clk);
+ if (ret)
+ return ret;
+
+ regmap_update_bits(data->regmap, TSENSOR_CFG_REG1,
+ TSENSOR_CFG_REG1_ENABLE, TSENSOR_CFG_REG1_ENABLE);
+
+ return 0;
+}
+
+static int amlogic_thermal_disable(struct amlogic_thermal *data)
+{
+ regmap_update_bits(data->regmap, TSENSOR_CFG_REG1,
+ TSENSOR_CFG_REG1_ENABLE, 0);
+ clk_disable_unprepare(data->clk);
+
+ return 0;
+}
+
+static int amlogic_thermal_get_temp(void *data, int *temp)
+{
+ unsigned int tval;
+ struct amlogic_thermal *pdata = data;
+
+ if (!data)
+ return -EINVAL;
+
+ regmap_read(pdata->regmap, TSENSOR_STAT0, &tval);
+ *temp =
+ amlogic_thermal_code_to_millicelsius(pdata,
+ tval & TSENSOR_READ_TEMP_MASK);
+
+ return 0;
+}
+
+static const struct thermal_zone_of_device_ops amlogic_thermal_ops = {
+ .get_temp = amlogic_thermal_get_temp,
+};
+
+static const struct regmap_config amlogic_thermal_regmap_config_g12a = {
+ .reg_bits = 8,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = TSENSOR_STAT9,
+};
+
+static const struct amlogic_thermal_soc_calib_data amlogic_thermal_g12a = {
+ .A = 9411,
+ .B = 3159,
+ .m = 424,
+ .n = 324,
+};
+
+static const struct amlogic_thermal_data amlogic_thermal_g12a_cpu_param = {
+ .u_efuse_off = 0x128,
+ .calibration_parameters = &amlogic_thermal_g12a,
+ .regmap_config = &amlogic_thermal_regmap_config_g12a,
+};
+
+static const struct amlogic_thermal_data amlogic_thermal_g12a_ddr_param = {
+ .u_efuse_off = 0xf0,
+ .calibration_parameters = &amlogic_thermal_g12a,
+ .regmap_config = &amlogic_thermal_regmap_config_g12a,
+};
+
+static const struct of_device_id of_amlogic_thermal_match[] = {
+ {
+ .compatible = "amlogic,g12a-ddr-thermal",
+ .data = &amlogic_thermal_g12a_ddr_param,
+ },
+ {
+ .compatible = "amlogic,g12a-cpu-thermal",
+ .data = &amlogic_thermal_g12a_cpu_param,
+ },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, of_amlogic_thermal_match);
+
+static int amlogic_thermal_probe(struct platform_device *pdev)
+{
+ struct amlogic_thermal *pdata;
+ struct device *dev = &pdev->dev;
+ void __iomem *base;
+ int ret;
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ pdata->data = of_device_get_match_data(dev);
+ pdata->pdev = pdev;
+ platform_set_drvdata(pdev, pdata);
+
+ base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(base)) {
+ dev_err(dev, "failed to get io address\n");
+ return PTR_ERR(base);
+ }
+
+ pdata->regmap = devm_regmap_init_mmio(dev, base,
+ pdata->data->regmap_config);
+ if (IS_ERR(pdata->regmap))
+ return PTR_ERR(pdata->regmap);
+
+ pdata->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(pdata->clk)) {
+ if (PTR_ERR(pdata->clk) != -EPROBE_DEFER)
+ dev_err(dev, "failed to get clock\n");
+ return PTR_ERR(pdata->clk);
+ }
+
+ pdata->sec_ao_map = syscon_regmap_lookup_by_phandle
+ (pdev->dev.of_node, "amlogic,ao-secure");
+ if (IS_ERR(pdata->sec_ao_map)) {
+ dev_err(dev, "syscon regmap lookup failed.\n");
+ return PTR_ERR(pdata->sec_ao_map);
+ }
+
+ pdata->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
+ 0,
+ pdata,
+ &amlogic_thermal_ops);
+ if (IS_ERR(pdata->tzd)) {
+ ret = PTR_ERR(pdata->tzd);
+ dev_err(dev, "Failed to register tsensor: %d\n", ret);
+ return ret;
+ }
+
+ ret = amlogic_thermal_initialize(pdata);
+ if (ret)
+ return ret;
+
+ ret = amlogic_thermal_enable(pdata);
+
+ return ret;
+}
+
+static int amlogic_thermal_remove(struct platform_device *pdev)
+{
+ struct amlogic_thermal *data = platform_get_drvdata(pdev);
+
+ return amlogic_thermal_disable(data);
+}
+
+static int __maybe_unused amlogic_thermal_suspend(struct device *dev)
+{
+ struct amlogic_thermal *data = dev_get_drvdata(dev);
+
+ return amlogic_thermal_disable(data);
+}
+
+static int __maybe_unused amlogic_thermal_resume(struct device *dev)
+{
+ struct amlogic_thermal *data = dev_get_drvdata(dev);
+
+ return amlogic_thermal_enable(data);
+}
+
+static SIMPLE_DEV_PM_OPS(amlogic_thermal_pm_ops,
+ amlogic_thermal_suspend, amlogic_thermal_resume);
+
+static struct platform_driver amlogic_thermal_driver = {
+ .driver = {
+ .name = "amlogic_thermal",
+ .pm = &amlogic_thermal_pm_ops,
+ .of_match_table = of_amlogic_thermal_match,
+ },
+ .probe = amlogic_thermal_probe,
+ .remove = amlogic_thermal_remove,
+};
+
+module_platform_driver(amlogic_thermal_driver);
+
+MODULE_AUTHOR("Guillaume La Roque <glaroque@baylibre.com>");
+MODULE_DESCRIPTION("Amlogic thermal driver");
+MODULE_LICENSE("GPL v2");
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