170 lines
4.3 KiB
C
170 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Author: zhanghongchen <zhanghongchen@loongson.cn>
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* Yinbo Zhu <zhuyinbo@loongson.cn>
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* Copyright (C) 2022-2023 Loongson Technology Corporation Limited
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*/
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/minmax.h>
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#include <linux/module.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/thermal.h>
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#include <linux/units.h>
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#include "thermal_hwmon.h"
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#define LOONGSON2_MAX_SENSOR_SEL_NUM 3
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#define LOONGSON2_THSENS_CTRL_HI_REG 0x0
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#define LOONGSON2_THSENS_CTRL_LOW_REG 0x8
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#define LOONGSON2_THSENS_STATUS_REG 0x10
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#define LOONGSON2_THSENS_OUT_REG 0x14
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#define LOONGSON2_THSENS_INT_LO BIT(0)
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#define LOONGSON2_THSENS_INT_HIGH BIT(1)
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#define LOONGSON2_THSENS_OUT_MASK 0xFF
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struct loongson2_thermal_chip_data {
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unsigned int thermal_sensor_sel;
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};
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struct loongson2_thermal_data {
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void __iomem *regs;
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const struct loongson2_thermal_chip_data *chip_data;
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};
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static int loongson2_thermal_set(struct loongson2_thermal_data *data,
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int low, int high, bool enable)
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{
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u64 reg_ctrl = 0;
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int reg_off = data->chip_data->thermal_sensor_sel * 2;
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low = clamp(-40, low, high);
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high = clamp(125, low, high);
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low += HECTO;
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high += HECTO;
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reg_ctrl = low;
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reg_ctrl |= enable ? 0x100 : 0;
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writew(reg_ctrl, data->regs + LOONGSON2_THSENS_CTRL_LOW_REG + reg_off);
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reg_ctrl = high;
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reg_ctrl |= enable ? 0x100 : 0;
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writew(reg_ctrl, data->regs + LOONGSON2_THSENS_CTRL_HI_REG + reg_off);
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return 0;
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}
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static int loongson2_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
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{
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u32 reg_val;
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struct loongson2_thermal_data *data = thermal_zone_device_priv(tz);
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reg_val = readl(data->regs + LOONGSON2_THSENS_OUT_REG);
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*temp = ((reg_val & LOONGSON2_THSENS_OUT_MASK) - HECTO) * KILO;
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return 0;
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}
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static irqreturn_t loongson2_thermal_irq_thread(int irq, void *dev)
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{
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struct thermal_zone_device *tzd = dev;
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struct loongson2_thermal_data *data = thermal_zone_device_priv(tzd);
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writeb(LOONGSON2_THSENS_INT_LO | LOONGSON2_THSENS_INT_HIGH, data->regs +
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LOONGSON2_THSENS_STATUS_REG);
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thermal_zone_device_update(tzd, THERMAL_EVENT_UNSPECIFIED);
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return IRQ_HANDLED;
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}
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static int loongson2_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)
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{
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struct loongson2_thermal_data *data = thermal_zone_device_priv(tz);
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return loongson2_thermal_set(data, low/MILLI, high/MILLI, true);
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}
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static const struct thermal_zone_device_ops loongson2_of_thermal_ops = {
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.get_temp = loongson2_thermal_get_temp,
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.set_trips = loongson2_thermal_set_trips,
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};
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static int loongson2_thermal_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct loongson2_thermal_data *data;
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struct thermal_zone_device *tzd;
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int ret, irq, i;
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->chip_data = device_get_match_data(dev);
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data->regs = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(data->regs))
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return PTR_ERR(data->regs);
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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writeb(LOONGSON2_THSENS_INT_LO | LOONGSON2_THSENS_INT_HIGH, data->regs +
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LOONGSON2_THSENS_STATUS_REG);
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loongson2_thermal_set(data, 0, 0, false);
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for (i = 0; i <= LOONGSON2_MAX_SENSOR_SEL_NUM; i++) {
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tzd = devm_thermal_of_zone_register(dev, i, data,
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&loongson2_of_thermal_ops);
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if (!IS_ERR(tzd))
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break;
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if (PTR_ERR(tzd) != -ENODEV)
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continue;
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return dev_err_probe(dev, PTR_ERR(tzd), "failed to register");
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}
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ret = devm_request_threaded_irq(dev, irq, NULL, loongson2_thermal_irq_thread,
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IRQF_ONESHOT, "loongson2_thermal", tzd);
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if (ret < 0)
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return dev_err_probe(dev, ret, "failed to request alarm irq\n");
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devm_thermal_add_hwmon_sysfs(dev, tzd);
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return 0;
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}
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static const struct loongson2_thermal_chip_data loongson2_thermal_ls2k1000_data = {
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.thermal_sensor_sel = 0,
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};
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static const struct of_device_id of_loongson2_thermal_match[] = {
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{
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.compatible = "loongson,ls2k1000-thermal",
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.data = &loongson2_thermal_ls2k1000_data,
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},
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{ /* end */ }
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};
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MODULE_DEVICE_TABLE(of, of_loongson2_thermal_match);
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static struct platform_driver loongson2_thermal_driver = {
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.driver = {
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.name = "loongson2_thermal",
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.of_match_table = of_loongson2_thermal_match,
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},
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.probe = loongson2_thermal_probe,
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};
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module_platform_driver(loongson2_thermal_driver);
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MODULE_DESCRIPTION("Loongson2 thermal driver");
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MODULE_LICENSE("GPL");
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