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