185 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * ST Thermal Sensor Driver for memory mapped sensors.4 * Author: Ajit Pal Singh <ajitpal.singh@st.com>5 *6 * Copyright (C) 2003-2014 STMicroelectronics (R&D) Limited7 */8 9#include <linux/of.h>10#include <linux/module.h>11 12#include "st_thermal.h"13 14#define STIH416_MPE_CONF 0x015#define STIH416_MPE_STATUS 0x416#define STIH416_MPE_INT_THRESH 0x817#define STIH416_MPE_INT_EN 0xC18 19/* Power control bits for the memory mapped thermal sensor */20#define THERMAL_PDN BIT(4)21#define THERMAL_SRSTN BIT(10)22 23static const struct reg_field st_mmap_thermal_regfields[MAX_REGFIELDS] = {24 /*25 * According to the STIH416 MPE temp sensor data sheet -26 * the PDN (Power Down Bit) and SRSTN (Soft Reset Bit) need to be27 * written simultaneously for powering on and off the temperature28 * sensor. regmap_update_bits() will be used to update the register.29 */30 [INT_THRESH_HI] = REG_FIELD(STIH416_MPE_INT_THRESH, 0, 7),31 [DCORRECT] = REG_FIELD(STIH416_MPE_CONF, 5, 9),32 [OVERFLOW] = REG_FIELD(STIH416_MPE_STATUS, 9, 9),33 [DATA] = REG_FIELD(STIH416_MPE_STATUS, 11, 18),34 [INT_ENABLE] = REG_FIELD(STIH416_MPE_INT_EN, 0, 0),35};36 37static irqreturn_t st_mmap_thermal_trip_handler(int irq, void *sdata)38{39 struct st_thermal_sensor *sensor = sdata;40 41 thermal_zone_device_update(sensor->thermal_dev,42 THERMAL_EVENT_UNSPECIFIED);43 44 return IRQ_HANDLED;45}46 47/* Private ops for the Memory Mapped based thermal sensors */48static int st_mmap_power_ctrl(struct st_thermal_sensor *sensor,49 enum st_thermal_power_state power_state)50{51 const unsigned int mask = (THERMAL_PDN | THERMAL_SRSTN);52 const unsigned int val = power_state ? mask : 0;53 54 return regmap_update_bits(sensor->regmap, STIH416_MPE_CONF, mask, val);55}56 57static int st_mmap_alloc_regfields(struct st_thermal_sensor *sensor)58{59 struct device *dev = sensor->dev;60 struct regmap *regmap = sensor->regmap;61 const struct reg_field *reg_fields = sensor->cdata->reg_fields;62 63 sensor->int_thresh_hi = devm_regmap_field_alloc(dev, regmap,64 reg_fields[INT_THRESH_HI]);65 sensor->int_enable = devm_regmap_field_alloc(dev, regmap,66 reg_fields[INT_ENABLE]);67 68 if (IS_ERR(sensor->int_thresh_hi) || IS_ERR(sensor->int_enable)) {69 dev_err(dev, "failed to alloc mmap regfields\n");70 return -EINVAL;71 }72 73 return 0;74}75 76static int st_mmap_enable_irq(struct st_thermal_sensor *sensor)77{78 int ret;79 80 /* Set upper critical threshold */81 ret = regmap_field_write(sensor->int_thresh_hi,82 sensor->cdata->crit_temp -83 sensor->cdata->temp_adjust_val);84 if (ret)85 return ret;86 87 return regmap_field_write(sensor->int_enable, 1);88}89 90static int st_mmap_register_enable_irq(struct st_thermal_sensor *sensor)91{92 struct device *dev = sensor->dev;93 struct platform_device *pdev = to_platform_device(dev);94 int ret;95 96 sensor->irq = platform_get_irq(pdev, 0);97 if (sensor->irq < 0)98 return sensor->irq;99 100 ret = devm_request_threaded_irq(dev, sensor->irq,101 NULL, st_mmap_thermal_trip_handler,102 IRQF_TRIGGER_RISING | IRQF_ONESHOT,103 dev->driver->name, sensor);104 if (ret) {105 dev_err(dev, "failed to register IRQ %d\n", sensor->irq);106 return ret;107 }108 109 return st_mmap_enable_irq(sensor);110}111 112static const struct regmap_config st_416mpe_regmap_config = {113 .reg_bits = 32,114 .val_bits = 32,115 .reg_stride = 4,116};117 118static int st_mmap_regmap_init(struct st_thermal_sensor *sensor)119{120 struct device *dev = sensor->dev;121 struct platform_device *pdev = to_platform_device(dev);122 123 sensor->mmio_base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);124 if (IS_ERR(sensor->mmio_base))125 return PTR_ERR(sensor->mmio_base);126 127 sensor->regmap = devm_regmap_init_mmio(dev, sensor->mmio_base,128 &st_416mpe_regmap_config);129 if (IS_ERR(sensor->regmap)) {130 dev_err(dev, "failed to initialise regmap\n");131 return PTR_ERR(sensor->regmap);132 }133 134 return 0;135}136 137static const struct st_thermal_sensor_ops st_mmap_sensor_ops = {138 .power_ctrl = st_mmap_power_ctrl,139 .alloc_regfields = st_mmap_alloc_regfields,140 .regmap_init = st_mmap_regmap_init,141 .register_enable_irq = st_mmap_register_enable_irq,142 .enable_irq = st_mmap_enable_irq,143};144 145/* Compatible device data stih407 thermal sensor */146static const struct st_thermal_compat_data st_407_cdata = {147 .reg_fields = st_mmap_thermal_regfields,148 .ops = &st_mmap_sensor_ops,149 .calibration_val = 16,150 .temp_adjust_val = -95,151 .crit_temp = 120,152};153 154static const struct of_device_id st_mmap_thermal_of_match[] = {155 { .compatible = "st,stih407-thermal", .data = &st_407_cdata },156 { /* sentinel */ }157};158MODULE_DEVICE_TABLE(of, st_mmap_thermal_of_match);159 160static int st_mmap_probe(struct platform_device *pdev)161{162 return st_thermal_register(pdev, st_mmap_thermal_of_match);163}164 165static void st_mmap_remove(struct platform_device *pdev)166{167 st_thermal_unregister(pdev);168}169 170static struct platform_driver st_mmap_thermal_driver = {171 .driver = {172 .name = "st_thermal_mmap",173 .pm = pm_sleep_ptr(&st_thermal_pm_ops),174 .of_match_table = st_mmap_thermal_of_match,175 },176 .probe = st_mmap_probe,177 .remove_new = st_mmap_remove,178};179 180module_platform_driver(st_mmap_thermal_driver);181 182MODULE_AUTHOR("STMicroelectronics (R&D) Limited <ajitpal.singh@st.com>");183MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver");184MODULE_LICENSE("GPL v2");185