drivers/thermal/imx8mm_thermal.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright 2020 NXP.
   4  *
   5  * Author: Anson Huang <Anson.Huang@nxp.com>
   6  */
   7
   8 #include <linux/bitfield.h>
   9 #include <linux/clk.h>
  10 #include <linux/err.h>
  11 #include <linux/io.h>
  12 #include <linux/module.h>
  13 #include <linux/of.h>
  14 #include <linux/of_device.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/thermal.h>
  17
  18 #include "thermal_core.h"
  19
  20 #define TER                     0x0     /* TMU enable */
  21 #define TPS                     0x4
  22 #define TRITSR                  0x20    /* TMU immediate temp */
  23
  24 #define TER_EN                  BIT(31)
  25 #define TRITSR_TEMP0_VAL_MASK   0xff
  26 #define TRITSR_TEMP1_VAL_MASK   0xff0000
  27
  28 #define PROBE_SEL_ALL           GENMASK(31, 30)
  29
  30 #define probe_status_offset(x)  (30 + x)
  31 #define SIGN_BIT                BIT(7)
  32 #define TEMP_VAL_MASK           GENMASK(6, 0)
  33
  34 #define VER1_TEMP_LOW_LIMIT     10000
  35 #define VER2_TEMP_LOW_LIMIT     -40000
  36 #define VER2_TEMP_HIGH_LIMIT    125000
  37
  38 #define TMU_VER1                0x1
  39 #define TMU_VER2                0x2
  40
  41 struct thermal_soc_data {
  42         u32 num_sensors;
  43         u32 version;
  44         int (*get_temp)(void *, int *);
  45 };
  46
  47 struct tmu_sensor {
  48         struct imx8mm_tmu *priv;
  49         u32 hw_id;
  50         struct thermal_zone_device *tzd;
  51 };
  52
  53 struct imx8mm_tmu {
  54         void __iomem *base;
  55         struct clk *clk;
  56         const struct thermal_soc_data *socdata;
  57         struct tmu_sensor sensors[0];
  58 };
  59
  60 static int imx8mm_tmu_get_temp(void *data, int *temp)
  61 {
  62         struct tmu_sensor *sensor = data;
  63         struct imx8mm_tmu *tmu = sensor->priv;
  64         u32 val;
  65
  66         val = readl_relaxed(tmu->base + TRITSR) & TRITSR_TEMP0_VAL_MASK;
  67         *temp = val * 1000;
  68         if (*temp < VER1_TEMP_LOW_LIMIT)
  69                 return -EAGAIN;
  70
  71         return 0;
  72 }
  73
  74 static int imx8mp_tmu_get_temp(void *data, int *temp)
  75 {
  76         struct tmu_sensor *sensor = data;
  77         struct imx8mm_tmu *tmu = sensor->priv;
  78         unsigned long val;
  79         bool ready;
  80
  81         val = readl_relaxed(tmu->base + TRITSR);
  82         ready = test_bit(probe_status_offset(sensor->hw_id), &val);
  83         if (!ready)
  84                 return -EAGAIN;
  85
  86         val = sensor->hw_id ? FIELD_GET(TRITSR_TEMP1_VAL_MASK, val) :
  87               FIELD_GET(TRITSR_TEMP0_VAL_MASK, val);
  88         if (val & SIGN_BIT) /* negative */
  89                 val = (~(val & TEMP_VAL_MASK) + 1);
  90
  91         *temp = val * 1000;
  92         if (*temp < VER2_TEMP_LOW_LIMIT || *temp > VER2_TEMP_HIGH_LIMIT)
  93                 return -EAGAIN;
  94
  95         return 0;
  96 }
  97
  98 static int tmu_get_temp(void *data, int *temp)
  99 {
 100         struct tmu_sensor *sensor = data;
 101         struct imx8mm_tmu *tmu = sensor->priv;
 102
 103         return tmu->socdata->get_temp(data, temp);
 104 }
 105
 106 static struct thermal_zone_of_device_ops tmu_tz_ops = {
 107         .get_temp = tmu_get_temp,
 108 };
 109
 110 static void imx8mm_tmu_enable(struct imx8mm_tmu *tmu, bool enable)
 111 {
 112         u32 val;
 113
 114         val = readl_relaxed(tmu->base + TER);
 115         val = enable ? (val | TER_EN) : (val & ~TER_EN);
 116         writel_relaxed(val, tmu->base + TER);
 117 }
 118
 119 static void imx8mm_tmu_probe_sel_all(struct imx8mm_tmu *tmu)
 120 {
 121         u32 val;
 122
 123         val = readl_relaxed(tmu->base + TPS);
 124         val |= PROBE_SEL_ALL;
 125         writel_relaxed(val, tmu->base + TPS);
 126 }
 127
 128 static int imx8mm_tmu_probe(struct platform_device *pdev)
 129 {
 130         const struct thermal_soc_data *data;
 131         struct imx8mm_tmu *tmu;
 132         int ret;
 133         int i;
 134
 135         data = of_device_get_match_data(&pdev->dev);
 136
 137         tmu = devm_kzalloc(&pdev->dev, struct_size(tmu, sensors,
 138                            data->num_sensors), GFP_KERNEL);
 139         if (!tmu)
 140                 return -ENOMEM;
 141
 142         tmu->socdata = data;
 143
 144         tmu->base = devm_platform_ioremap_resource(pdev, 0);
 145         if (IS_ERR(tmu->base))
 146                 return PTR_ERR(tmu->base);
 147
 148         tmu->clk = devm_clk_get(&pdev->dev, NULL);
 149         if (IS_ERR(tmu->clk)) {
 150                 ret = PTR_ERR(tmu->clk);
 151                 if (ret != -EPROBE_DEFER)
 152                         dev_err(&pdev->dev,
 153                                 "failed to get tmu clock: %d\n", ret);
 154                 return ret;
 155         }
 156
 157         ret = clk_prepare_enable(tmu->clk);
 158         if (ret) {
 159                 dev_err(&pdev->dev, "failed to enable tmu clock: %d\n", ret);
 160                 return ret;
 161         }
 162
 163         /* disable the monitor during initialization */
 164         imx8mm_tmu_enable(tmu, false);
 165
 166         for (i = 0; i < data->num_sensors; i++) {
 167                 tmu->sensors[i].priv = tmu;
 168                 tmu->sensors[i].tzd =
 169                         devm_thermal_zone_of_sensor_register(&pdev->dev, i,
 170                                                              &tmu->sensors[i],
 171                                                              &tmu_tz_ops);
 172                 if (IS_ERR(tmu->sensors[i].tzd)) {
 173                         dev_err(&pdev->dev,
 174                                 "failed to register thermal zone sensor[%d]: %d\n",
 175                                 i, ret);
 176                         return PTR_ERR(tmu->sensors[i].tzd);
 177                 }
 178                 tmu->sensors[i].hw_id = i;
 179         }
 180
 181         platform_set_drvdata(pdev, tmu);
 182
 183         /* enable all the probes for V2 TMU */
 184         if (tmu->socdata->version == TMU_VER2)
 185                 imx8mm_tmu_probe_sel_all(tmu);
 186
 187         /* enable the monitor */
 188         imx8mm_tmu_enable(tmu, true);
 189
 190         return 0;
 191 }
 192
 193 static int imx8mm_tmu_remove(struct platform_device *pdev)
 194 {
 195         struct imx8mm_tmu *tmu = platform_get_drvdata(pdev);
 196
 197         /* disable TMU */
 198         imx8mm_tmu_enable(tmu, false);
 199
 200         clk_disable_unprepare(tmu->clk);
 201         platform_set_drvdata(pdev, NULL);
 202
 203         return 0;
 204 }
 205
 206 static struct thermal_soc_data imx8mm_tmu_data = {
 207         .num_sensors = 1,
 208         .version = TMU_VER1,
 209         .get_temp = imx8mm_tmu_get_temp,
 210 };
 211
 212 static struct thermal_soc_data imx8mp_tmu_data = {
 213         .num_sensors = 2,
 214         .version = TMU_VER2,
 215         .get_temp = imx8mp_tmu_get_temp,
 216 };
 217
 218 static const struct of_device_id imx8mm_tmu_table[] = {
 219         { .compatible = "fsl,imx8mm-tmu", .data = &imx8mm_tmu_data, },
 220         { .compatible = "fsl,imx8mp-tmu", .data = &imx8mp_tmu_data, },
 221         { },
 222 };
 223
 224 static struct platform_driver imx8mm_tmu = {
 225         .driver = {
 226                 .name   = "i.mx8mm_thermal",
 227                 .of_match_table = imx8mm_tmu_table,
 228         },
 229         .probe = imx8mm_tmu_probe,
 230         .remove = imx8mm_tmu_remove,
 231 };
 232 module_platform_driver(imx8mm_tmu);
 233
 234 MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
 235 MODULE_DESCRIPTION("i.MX8MM Thermal Monitor Unit driver");
 236 MODULE_LICENSE("GPL v2");