mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
194 lines
5.5 KiB
194 lines
5.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* ST Thermal Sensor Driver for memory mapped sensors. |
|
* Author: Ajit Pal Singh <[email protected]> |
|
* |
|
* Copyright (C) 2003-2014 STMicroelectronics (R&D) Limited |
|
*/ |
|
|
|
#include <linux/of.h> |
|
#include <linux/module.h> |
|
|
|
#include "st_thermal.h" |
|
|
|
#define STIH416_MPE_CONF 0x0 |
|
#define STIH416_MPE_STATUS 0x4 |
|
#define STIH416_MPE_INT_THRESH 0x8 |
|
#define STIH416_MPE_INT_EN 0xC |
|
|
|
/* Power control bits for the memory mapped thermal sensor */ |
|
#define THERMAL_PDN BIT(4) |
|
#define THERMAL_SRSTN BIT(10) |
|
|
|
static const struct reg_field st_mmap_thermal_regfields[MAX_REGFIELDS] = { |
|
/* |
|
* According to the STIH416 MPE temp sensor data sheet - |
|
* the PDN (Power Down Bit) and SRSTN (Soft Reset Bit) need to be |
|
* written simultaneously for powering on and off the temperature |
|
* sensor. regmap_update_bits() will be used to update the register. |
|
*/ |
|
[INT_THRESH_HI] = REG_FIELD(STIH416_MPE_INT_THRESH, 0, 7), |
|
[DCORRECT] = REG_FIELD(STIH416_MPE_CONF, 5, 9), |
|
[OVERFLOW] = REG_FIELD(STIH416_MPE_STATUS, 9, 9), |
|
[DATA] = REG_FIELD(STIH416_MPE_STATUS, 11, 18), |
|
[INT_ENABLE] = REG_FIELD(STIH416_MPE_INT_EN, 0, 0), |
|
}; |
|
|
|
static irqreturn_t st_mmap_thermal_trip_handler(int irq, void *sdata) |
|
{ |
|
struct st_thermal_sensor *sensor = sdata; |
|
|
|
thermal_zone_device_update(sensor->thermal_dev, |
|
THERMAL_EVENT_UNSPECIFIED); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
/* Private ops for the Memory Mapped based thermal sensors */ |
|
static int st_mmap_power_ctrl(struct st_thermal_sensor *sensor, |
|
enum st_thermal_power_state power_state) |
|
{ |
|
const unsigned int mask = (THERMAL_PDN | THERMAL_SRSTN); |
|
const unsigned int val = power_state ? mask : 0; |
|
|
|
return regmap_update_bits(sensor->regmap, STIH416_MPE_CONF, mask, val); |
|
} |
|
|
|
static int st_mmap_alloc_regfields(struct st_thermal_sensor *sensor) |
|
{ |
|
struct device *dev = sensor->dev; |
|
struct regmap *regmap = sensor->regmap; |
|
const struct reg_field *reg_fields = sensor->cdata->reg_fields; |
|
|
|
sensor->int_thresh_hi = devm_regmap_field_alloc(dev, regmap, |
|
reg_fields[INT_THRESH_HI]); |
|
sensor->int_enable = devm_regmap_field_alloc(dev, regmap, |
|
reg_fields[INT_ENABLE]); |
|
|
|
if (IS_ERR(sensor->int_thresh_hi) || IS_ERR(sensor->int_enable)) { |
|
dev_err(dev, "failed to alloc mmap regfields\n"); |
|
return -EINVAL; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int st_mmap_enable_irq(struct st_thermal_sensor *sensor) |
|
{ |
|
int ret; |
|
|
|
/* Set upper critical threshold */ |
|
ret = regmap_field_write(sensor->int_thresh_hi, |
|
sensor->cdata->crit_temp - |
|
sensor->cdata->temp_adjust_val); |
|
if (ret) |
|
return ret; |
|
|
|
return regmap_field_write(sensor->int_enable, 1); |
|
} |
|
|
|
static int st_mmap_register_enable_irq(struct st_thermal_sensor *sensor) |
|
{ |
|
struct device *dev = sensor->dev; |
|
struct platform_device *pdev = to_platform_device(dev); |
|
int ret; |
|
|
|
sensor->irq = platform_get_irq(pdev, 0); |
|
if (sensor->irq < 0) |
|
return sensor->irq; |
|
|
|
ret = devm_request_threaded_irq(dev, sensor->irq, |
|
NULL, st_mmap_thermal_trip_handler, |
|
IRQF_TRIGGER_RISING | IRQF_ONESHOT, |
|
dev->driver->name, sensor); |
|
if (ret) { |
|
dev_err(dev, "failed to register IRQ %d\n", sensor->irq); |
|
return ret; |
|
} |
|
|
|
return st_mmap_enable_irq(sensor); |
|
} |
|
|
|
static const struct regmap_config st_416mpe_regmap_config = { |
|
.reg_bits = 32, |
|
.val_bits = 32, |
|
.reg_stride = 4, |
|
}; |
|
|
|
static int st_mmap_regmap_init(struct st_thermal_sensor *sensor) |
|
{ |
|
struct device *dev = sensor->dev; |
|
struct platform_device *pdev = to_platform_device(dev); |
|
|
|
sensor->mmio_base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL); |
|
if (IS_ERR(sensor->mmio_base)) |
|
return PTR_ERR(sensor->mmio_base); |
|
|
|
sensor->regmap = devm_regmap_init_mmio(dev, sensor->mmio_base, |
|
&st_416mpe_regmap_config); |
|
if (IS_ERR(sensor->regmap)) { |
|
dev_err(dev, "failed to initialise regmap\n"); |
|
return PTR_ERR(sensor->regmap); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static const struct st_thermal_sensor_ops st_mmap_sensor_ops = { |
|
.power_ctrl = st_mmap_power_ctrl, |
|
.alloc_regfields = st_mmap_alloc_regfields, |
|
.regmap_init = st_mmap_regmap_init, |
|
.register_enable_irq = st_mmap_register_enable_irq, |
|
.enable_irq = st_mmap_enable_irq, |
|
}; |
|
|
|
/* Compatible device data stih416 mpe thermal sensor */ |
|
static const struct st_thermal_compat_data st_416mpe_cdata = { |
|
.reg_fields = st_mmap_thermal_regfields, |
|
.ops = &st_mmap_sensor_ops, |
|
.calibration_val = 14, |
|
.temp_adjust_val = -95, |
|
.crit_temp = 120, |
|
}; |
|
|
|
/* Compatible device data stih407 thermal sensor */ |
|
static const struct st_thermal_compat_data st_407_cdata = { |
|
.reg_fields = st_mmap_thermal_regfields, |
|
.ops = &st_mmap_sensor_ops, |
|
.calibration_val = 16, |
|
.temp_adjust_val = -95, |
|
.crit_temp = 120, |
|
}; |
|
|
|
static const struct of_device_id st_mmap_thermal_of_match[] = { |
|
{ .compatible = "st,stih416-mpe-thermal", .data = &st_416mpe_cdata }, |
|
{ .compatible = "st,stih407-thermal", .data = &st_407_cdata }, |
|
{ /* sentinel */ } |
|
}; |
|
MODULE_DEVICE_TABLE(of, st_mmap_thermal_of_match); |
|
|
|
static int st_mmap_probe(struct platform_device *pdev) |
|
{ |
|
return st_thermal_register(pdev, st_mmap_thermal_of_match); |
|
} |
|
|
|
static int st_mmap_remove(struct platform_device *pdev) |
|
{ |
|
return st_thermal_unregister(pdev); |
|
} |
|
|
|
static struct platform_driver st_mmap_thermal_driver = { |
|
.driver = { |
|
.name = "st_thermal_mmap", |
|
.pm = &st_thermal_pm_ops, |
|
.of_match_table = st_mmap_thermal_of_match, |
|
}, |
|
.probe = st_mmap_probe, |
|
.remove = st_mmap_remove, |
|
}; |
|
|
|
module_platform_driver(st_mmap_thermal_driver); |
|
|
|
MODULE_AUTHOR("STMicroelectronics (R&D) Limited <[email protected]>"); |
|
MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|