drivers/thermal/loongson2_thermal.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Author: zhanghongchen <zhanghongchen@loongson.cn>
   4  *         Yinbo Zhu <zhuyinbo@loongson.cn>
   5  * Copyright (C) 2022-2023 Loongson Technology Corporation Limited
   6  */
   7
   8 #include <linux/interrupt.h>
   9 #include <linux/io.h>
  10 #include <linux/minmax.h>
  11 #include <linux/mod_devicetable.h>
  12 #include <linux/module.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/property.h>
  15 #include <linux/thermal.h>
  16 #include <linux/units.h>
  17 #include "thermal_hwmon.h"
  18
  19 #define LOONGSON2_MAX_SENSOR_SEL_NUM                    3
  20
  21 #define LOONGSON2_THSENS_CTRL_HI_REG                    0x0
  22 #define LOONGSON2_THSENS_CTRL_LOW_REG                   0x8
  23 #define LOONGSON2_THSENS_STATUS_REG                     0x10
  24 #define LOONGSON2_THSENS_OUT_REG                        0x14
  25
  26 #define LOONGSON2_THSENS_INT_LO                         BIT(0)
  27 #define LOONGSON2_THSENS_INT_HIGH                       BIT(1)
  28 #define LOONGSON2_THSENS_OUT_MASK                       0xFF
  29
  30 struct loongson2_thermal_chip_data {
  31         unsigned int    thermal_sensor_sel;
  32 };
  33
  34 struct loongson2_thermal_data {
  35         void __iomem    *regs;
  36         const struct loongson2_thermal_chip_data *chip_data;
  37 };
  38
  39 static int loongson2_thermal_set(struct loongson2_thermal_data *data,
  40                                         int low, int high, bool enable)
  41 {
  42         u64 reg_ctrl = 0;
  43         int reg_off = data->chip_data->thermal_sensor_sel * 2;
  44
  45         low = clamp(-40, low, high);
  46         high = clamp(125, low, high);
  47
  48         low += HECTO;
  49         high += HECTO;
  50
  51         reg_ctrl = low;
  52         reg_ctrl |= enable ? 0x100 : 0;
  53         writew(reg_ctrl, data->regs + LOONGSON2_THSENS_CTRL_LOW_REG + reg_off);
  54
  55         reg_ctrl = high;
  56         reg_ctrl |= enable ? 0x100 : 0;
  57         writew(reg_ctrl, data->regs + LOONGSON2_THSENS_CTRL_HI_REG + reg_off);
  58
  59         return 0;
  60 }
  61
  62 static int loongson2_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
  63 {
  64         u32 reg_val;
  65         struct loongson2_thermal_data *data = thermal_zone_device_priv(tz);
  66
  67         reg_val = readl(data->regs + LOONGSON2_THSENS_OUT_REG);
  68         *temp = ((reg_val & LOONGSON2_THSENS_OUT_MASK) - HECTO) * KILO;
  69
  70         return 0;
  71 }
  72
  73 static irqreturn_t loongson2_thermal_irq_thread(int irq, void *dev)
  74 {
  75         struct thermal_zone_device *tzd = dev;
  76         struct loongson2_thermal_data *data = thermal_zone_device_priv(tzd);
  77
  78         writeb(LOONGSON2_THSENS_INT_LO | LOONGSON2_THSENS_INT_HIGH, data->regs +
  79                 LOONGSON2_THSENS_STATUS_REG);
  80
  81         thermal_zone_device_update(tzd, THERMAL_EVENT_UNSPECIFIED);
  82
  83         return IRQ_HANDLED;
  84 }
  85
  86 static int loongson2_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)
  87 {
  88         struct loongson2_thermal_data *data = thermal_zone_device_priv(tz);
  89
  90         return loongson2_thermal_set(data, low/MILLI, high/MILLI, true);
  91 }
  92
  93 static const struct thermal_zone_device_ops loongson2_of_thermal_ops = {
  94         .get_temp = loongson2_thermal_get_temp,
  95         .set_trips = loongson2_thermal_set_trips,
  96 };
  97
  98 static int loongson2_thermal_probe(struct platform_device *pdev)
  99 {
 100         struct device *dev = &pdev->dev;
 101         struct loongson2_thermal_data *data;
 102         struct thermal_zone_device *tzd;
 103         int ret, irq, i;
 104
 105         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 106         if (!data)
 107                 return -ENOMEM;
 108
 109         data->chip_data = device_get_match_data(dev);
 110
 111         data->regs = devm_platform_ioremap_resource(pdev, 0);
 112         if (IS_ERR(data->regs))
 113                 return PTR_ERR(data->regs);
 114
 115         irq = platform_get_irq(pdev, 0);
 116         if (irq < 0)
 117                 return irq;
 118
 119         writeb(LOONGSON2_THSENS_INT_LO | LOONGSON2_THSENS_INT_HIGH, data->regs +
 120                 LOONGSON2_THSENS_STATUS_REG);
 121
 122         loongson2_thermal_set(data, 0, 0, false);
 123
 124         for (i = 0; i <= LOONGSON2_MAX_SENSOR_SEL_NUM; i++) {
 125                 tzd = devm_thermal_of_zone_register(dev, i, data,
 126                         &loongson2_of_thermal_ops);
 127
 128                 if (!IS_ERR(tzd))
 129                         break;
 130
 131                 if (PTR_ERR(tzd) != -ENODEV)
 132                         continue;
 133
 134                 return dev_err_probe(dev, PTR_ERR(tzd), "failed to register");
 135         }
 136
 137         ret = devm_request_threaded_irq(dev, irq, NULL, loongson2_thermal_irq_thread,
 138                         IRQF_ONESHOT, "loongson2_thermal", tzd);
 139         if (ret < 0)
 140                 return dev_err_probe(dev, ret, "failed to request alarm irq\n");
 141
 142         devm_thermal_add_hwmon_sysfs(dev, tzd);
 143
 144         return 0;
 145 }
 146
 147 static const struct loongson2_thermal_chip_data loongson2_thermal_ls2k1000_data = {
 148         .thermal_sensor_sel = 0,
 149 };
 150
 151 static const struct of_device_id of_loongson2_thermal_match[] = {
 152         {
 153                 .compatible = "loongson,ls2k1000-thermal",
 154                 .data = &loongson2_thermal_ls2k1000_data,
 155         },
 156         { /* end */ }
 157 };
 158 MODULE_DEVICE_TABLE(of, of_loongson2_thermal_match);
 159
 160 static struct platform_driver loongson2_thermal_driver = {
 161         .driver = {
 162                 .name           = "loongson2_thermal",
 163                 .of_match_table = of_loongson2_thermal_match,
 164         },
 165         .probe  = loongson2_thermal_probe,
 166 };
 167 module_platform_driver(loongson2_thermal_driver);
 168
 169 MODULE_DESCRIPTION("Loongson2 thermal driver");
 170 MODULE_LICENSE("GPL");