![Lee Jones](/assets/img/avatar_default.png)
This is the traditional way of obtaining a device driver's register address space. The aim of this driver is to supply controller specific information to the ST Thermal Core. Signed-off-by: Ajit Pal Singh <ajitpal.singh@st.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
210 lines
5.9 KiB
C
210 lines
5.9 KiB
C
/*
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* ST Thermal Sensor Driver for memory mapped sensors.
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* Author: Ajit Pal Singh <ajitpal.singh@st.com>
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*
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* Copyright (C) 2003-2014 STMicroelectronics (R&D) Limited
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/of.h>
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#include <linux/module.h>
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#include "st_thermal.h"
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#define STIH416_MPE_CONF 0x0
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#define STIH416_MPE_STATUS 0x4
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#define STIH416_MPE_INT_THRESH 0x8
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#define STIH416_MPE_INT_EN 0xC
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/* Power control bits for the memory mapped thermal sensor */
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#define THERMAL_PDN BIT(4)
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#define THERMAL_SRSTN BIT(10)
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static const struct reg_field st_mmap_thermal_regfields[MAX_REGFIELDS] = {
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/*
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* According to the STIH416 MPE temp sensor data sheet -
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* the PDN (Power Down Bit) and SRSTN (Soft Reset Bit) need to be
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* written simultaneously for powering on and off the temperature
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* sensor. regmap_update_bits() will be used to update the register.
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*/
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[INT_THRESH_HI] = REG_FIELD(STIH416_MPE_INT_THRESH, 0, 7),
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[DCORRECT] = REG_FIELD(STIH416_MPE_CONF, 5, 9),
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[OVERFLOW] = REG_FIELD(STIH416_MPE_STATUS, 9, 9),
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[DATA] = REG_FIELD(STIH416_MPE_STATUS, 11, 18),
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[INT_ENABLE] = REG_FIELD(STIH416_MPE_INT_EN, 0, 0),
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};
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static irqreturn_t st_mmap_thermal_trip_handler(int irq, void *sdata)
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{
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struct st_thermal_sensor *sensor = sdata;
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thermal_zone_device_update(sensor->thermal_dev);
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return IRQ_HANDLED;
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}
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/* Private ops for the Memory Mapped based thermal sensors */
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static int st_mmap_power_ctrl(struct st_thermal_sensor *sensor,
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enum st_thermal_power_state power_state)
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{
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const unsigned int mask = (THERMAL_PDN | THERMAL_SRSTN);
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const unsigned int val = power_state ? mask : 0;
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return regmap_update_bits(sensor->regmap, STIH416_MPE_CONF, mask, val);
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}
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static int st_mmap_alloc_regfields(struct st_thermal_sensor *sensor)
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{
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struct device *dev = sensor->dev;
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struct regmap *regmap = sensor->regmap;
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const struct reg_field *reg_fields = sensor->cdata->reg_fields;
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sensor->int_thresh_hi = devm_regmap_field_alloc(dev, regmap,
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reg_fields[INT_THRESH_HI]);
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sensor->int_enable = devm_regmap_field_alloc(dev, regmap,
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reg_fields[INT_ENABLE]);
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if (IS_ERR(sensor->int_thresh_hi) || IS_ERR(sensor->int_enable)) {
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dev_err(dev, "failed to alloc mmap regfields\n");
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return -EINVAL;
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}
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return 0;
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}
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static int st_mmap_enable_irq(struct st_thermal_sensor *sensor)
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{
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int ret;
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/* Set upper critical threshold */
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ret = regmap_field_write(sensor->int_thresh_hi,
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sensor->cdata->crit_temp -
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sensor->cdata->temp_adjust_val);
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if (ret)
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return ret;
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return regmap_field_write(sensor->int_enable, 1);
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}
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static int st_mmap_register_enable_irq(struct st_thermal_sensor *sensor)
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{
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struct device *dev = sensor->dev;
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struct platform_device *pdev = to_platform_device(dev);
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int ret;
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sensor->irq = platform_get_irq(pdev, 0);
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if (sensor->irq < 0) {
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dev_err(dev, "failed to register IRQ\n");
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return sensor->irq;
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}
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ret = devm_request_threaded_irq(dev, sensor->irq,
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NULL, st_mmap_thermal_trip_handler,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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dev->driver->name, sensor);
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if (ret) {
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dev_err(dev, "failed to register IRQ %d\n", sensor->irq);
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return ret;
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}
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return st_mmap_enable_irq(sensor);
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}
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static const struct regmap_config st_416mpe_regmap_config = {
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = 4,
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};
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static int st_mmap_regmap_init(struct st_thermal_sensor *sensor)
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{
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struct device *dev = sensor->dev;
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struct platform_device *pdev = to_platform_device(dev);
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struct resource *res;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(dev, "no memory resources defined\n");
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return -ENODEV;
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}
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sensor->mmio_base = devm_ioremap_resource(dev, res);
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if (IS_ERR(sensor->mmio_base)) {
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dev_err(dev, "failed to remap IO\n");
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return PTR_ERR(sensor->mmio_base);
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}
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sensor->regmap = devm_regmap_init_mmio(dev, sensor->mmio_base,
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&st_416mpe_regmap_config);
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if (IS_ERR(sensor->regmap)) {
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dev_err(dev, "failed to initialise regmap\n");
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return PTR_ERR(sensor->regmap);
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}
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return 0;
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}
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static const struct st_thermal_sensor_ops st_mmap_sensor_ops = {
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.power_ctrl = st_mmap_power_ctrl,
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.alloc_regfields = st_mmap_alloc_regfields,
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.regmap_init = st_mmap_regmap_init,
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.register_enable_irq = st_mmap_register_enable_irq,
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.enable_irq = st_mmap_enable_irq,
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};
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/* Compatible device data stih416 mpe thermal sensor */
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const struct st_thermal_compat_data st_416mpe_cdata = {
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.reg_fields = st_mmap_thermal_regfields,
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.ops = &st_mmap_sensor_ops,
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.calibration_val = 14,
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.temp_adjust_val = -95,
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.crit_temp = 120,
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};
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/* Compatible device data stih407 thermal sensor */
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const struct st_thermal_compat_data st_407_cdata = {
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.reg_fields = st_mmap_thermal_regfields,
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.ops = &st_mmap_sensor_ops,
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.calibration_val = 16,
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.temp_adjust_val = -95,
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.crit_temp = 120,
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};
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static struct of_device_id st_mmap_thermal_of_match[] = {
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{ .compatible = "st,stih416-mpe-thermal", .data = &st_416mpe_cdata },
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{ .compatible = "st,stih407-thermal", .data = &st_407_cdata },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, st_mmap_thermal_of_match);
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int st_mmap_probe(struct platform_device *pdev)
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{
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return st_thermal_register(pdev, st_mmap_thermal_of_match);
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}
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int st_mmap_remove(struct platform_device *pdev)
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{
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return st_thermal_unregister(pdev);
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}
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static struct platform_driver st_mmap_thermal_driver = {
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.driver = {
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.name = "st_thermal_mmap",
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.owner = THIS_MODULE,
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.pm = &st_thermal_pm_ops,
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.of_match_table = st_mmap_thermal_of_match,
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},
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.probe = st_mmap_probe,
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.remove = st_mmap_remove,
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};
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module_platform_driver(st_mmap_thermal_driver);
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MODULE_AUTHOR("STMicroelectronics (R&D) Limited <ajitpal.singh@st.com>");
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MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver");
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MODULE_LICENSE("GPL v2");
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