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// SPDX-License-Identifier: GPL-2.0+
/*
* Author: zhanghongchen <zhanghongchen@loongson.cn>
* Yinbo Zhu <zhuyinbo@loongson.cn>
* Copyright (C) 2022-2023 Loongson Technology Corporation Limited
*/
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/minmax.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/thermal.h>
#include <linux/units.h>
#include "thermal_hwmon.h"
#define LOONGSON2_MAX_SENSOR_SEL_NUM 3
#define LOONGSON2_THSENS_CTRL_HI_REG 0x0
#define LOONGSON2_THSENS_CTRL_LOW_REG 0x8
#define LOONGSON2_THSENS_STATUS_REG 0x10
#define LOONGSON2_THSENS_OUT_REG 0x14
#define LOONGSON2_THSENS_INT_LO BIT(0)
#define LOONGSON2_THSENS_INT_HIGH BIT(1)
#define LOONGSON2_THSENS_INT_EN (LOONGSON2_THSENS_INT_LO | \
LOONGSON2_THSENS_INT_HIGH)
#define LOONGSON2_THSENS_OUT_MASK 0xFF
/*
* This flag is used to indicate the temperature reading
* method of the Loongson-2K2000
*/
#define LS2K2000_THSENS_OUT_FLAG BIT(0)
struct loongson2_thermal_chip_data {
unsigned int thermal_sensor_sel;
unsigned int flags;
};
struct loongson2_thermal_data {
void __iomem *ctrl_reg;
void __iomem *temp_reg;
const struct loongson2_thermal_chip_data *chip_data;
};
static void loongson2_set_ctrl_regs(struct loongson2_thermal_data *data,
int ctrl_data, bool low, bool enable)
{
int reg_ctrl = 0;
int reg_off = data->chip_data->thermal_sensor_sel * 2;
int ctrl_reg = low ? LOONGSON2_THSENS_CTRL_LOW_REG : LOONGSON2_THSENS_CTRL_HI_REG;
reg_ctrl = ctrl_data + HECTO;
reg_ctrl |= enable ? 0x100 : 0;
writew(reg_ctrl, data->ctrl_reg + ctrl_reg + reg_off);
}
static int loongson2_thermal_set(struct loongson2_thermal_data *data,
int low, int high, bool enable)
{
/* Set low temperature threshold */
loongson2_set_ctrl_regs(data, clamp(-40, low, high), true, enable);
/* Set high temperature threshold */
loongson2_set_ctrl_regs(data, clamp(125, low, high), false, enable);
return 0;
}
static int loongson2_2k1000_get_temp(struct thermal_zone_device *tz, int *temp)
{
int val;
struct loongson2_thermal_data *data = thermal_zone_device_priv(tz);
val = readl(data->ctrl_reg + LOONGSON2_THSENS_OUT_REG);
*temp = ((val & LOONGSON2_THSENS_OUT_MASK) - HECTO) * KILO;
return 0;
}
static int loongson2_2k2000_get_temp(struct thermal_zone_device *tz, int *temp)
{
int val;
struct loongson2_thermal_data *data = thermal_zone_device_priv(tz);
val = readl(data->temp_reg);
*temp = ((val & 0xffff) * 820 / 0x4000 - 311) * KILO;
return 0;
}
static irqreturn_t loongson2_thermal_irq_thread(int irq, void *dev)
{
struct thermal_zone_device *tzd = dev;
struct loongson2_thermal_data *data = thermal_zone_device_priv(tzd);
writeb(LOONGSON2_THSENS_INT_EN, data->ctrl_reg + LOONGSON2_THSENS_STATUS_REG);
thermal_zone_device_update(tzd, THERMAL_EVENT_UNSPECIFIED);
return IRQ_HANDLED;
}
static int loongson2_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)
{
struct loongson2_thermal_data *data = thermal_zone_device_priv(tz);
return loongson2_thermal_set(data, low/MILLI, high/MILLI, true);
}
static struct thermal_zone_device_ops loongson2_of_thermal_ops = {
.get_temp = loongson2_2k1000_get_temp,
.set_trips = loongson2_thermal_set_trips,
};
static int loongson2_thermal_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct loongson2_thermal_data *data;
struct thermal_zone_device *tzd;
int ret, irq, i;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->chip_data = device_get_match_data(dev);
data->ctrl_reg = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(data->ctrl_reg))
return PTR_ERR(data->ctrl_reg);
/* The temperature output register is separate for Loongson-2K2000 */
if (data->chip_data->flags & LS2K2000_THSENS_OUT_FLAG) {
data->temp_reg = devm_platform_ioremap_resource(pdev, 1);
if (IS_ERR(data->temp_reg))
return PTR_ERR(data->temp_reg);
loongson2_of_thermal_ops.get_temp = loongson2_2k2000_get_temp;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
writeb(LOONGSON2_THSENS_INT_EN, data->ctrl_reg + LOONGSON2_THSENS_STATUS_REG);
loongson2_thermal_set(data, 0, 0, false);
for (i = 0; i <= LOONGSON2_MAX_SENSOR_SEL_NUM; i++) {
tzd = devm_thermal_of_zone_register(dev, i, data,
&loongson2_of_thermal_ops);
if (!IS_ERR(tzd))
break;
if (PTR_ERR(tzd) != -ENODEV)
continue;
return dev_err_probe(dev, PTR_ERR(tzd), "failed to register");
}
ret = devm_request_threaded_irq(dev, irq, NULL, loongson2_thermal_irq_thread,
IRQF_ONESHOT, "loongson2_thermal", tzd);
if (ret < 0)
return dev_err_probe(dev, ret, "failed to request alarm irq\n");
devm_thermal_add_hwmon_sysfs(dev, tzd);
return 0;
}
static const struct loongson2_thermal_chip_data loongson2_thermal_ls2k1000_data = {
.thermal_sensor_sel = 0,
.flags = 0,
};
static const struct loongson2_thermal_chip_data loongson2_thermal_ls2k2000_data = {
.thermal_sensor_sel = 0,
.flags = LS2K2000_THSENS_OUT_FLAG,
};
static const struct of_device_id of_loongson2_thermal_match[] = {
{
.compatible = "loongson,ls2k1000-thermal",
.data = &loongson2_thermal_ls2k1000_data,
},
{
.compatible = "loongson,ls2k2000-thermal",
.data = &loongson2_thermal_ls2k2000_data,
},
{ /* end */ }
};
MODULE_DEVICE_TABLE(of, of_loongson2_thermal_match);
static struct platform_driver loongson2_thermal_driver = {
.driver = {
.name = "loongson2_thermal",
.of_match_table = of_loongson2_thermal_match,
},
.probe = loongson2_thermal_probe,
};
module_platform_driver(loongson2_thermal_driver);
MODULE_DESCRIPTION("Loongson2 thermal driver");
MODULE_AUTHOR("Loongson Technology Corporation Limited");
MODULE_LICENSE("GPL");
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