drivers/thermal/imx8mm_thermal.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright 2020 NXP.
   4  *
   5  * Author: Anson Huang <[email protected]>
   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/nvmem-consumer.h>
  14 #include <linux/of.h>
  15 #include <linux/of_device.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/slab.h>
  18 #include <linux/thermal.h>
  19
  20 #include "thermal_hwmon.h"
  21
  22 #define TER                     0x0     /* TMU enable */
  23 #define TPS                     0x4
  24 #define TRITSR                  0x20    /* TMU immediate temp */
  25 /* TMU calibration data registers */
  26 #define TASR                    0x28
  27 #define TASR_BUF_SLOPE_MASK     GENMASK(19, 16)
  28 #define TASR_BUF_VREF_MASK      GENMASK(4, 0)   /* TMU_V1 */
  29 #define TASR_BUF_VERF_SEL_MASK  GENMASK(1, 0)   /* TMU_V2 */
  30 #define TCALIV(n)               (0x30 + ((n) * 4))
  31 #define TCALIV_EN               BIT(31)
  32 #define TCALIV_HR_MASK          GENMASK(23, 16) /* TMU_V1 */
  33 #define TCALIV_RT_MASK          GENMASK(7, 0)   /* TMU_V1 */
  34 #define TCALIV_SNSR105C_MASK    GENMASK(27, 16) /* TMU_V2 */
  35 #define TCALIV_SNSR25C_MASK     GENMASK(11, 0)  /* TMU_V2 */
  36 #define TRIM                    0x3c
  37 #define TRIM_BJT_CUR_MASK       GENMASK(23, 20)
  38 #define TRIM_BGR_MASK           GENMASK(31, 28)
  39 #define TRIM_VLSB_MASK          GENMASK(15, 12)
  40 #define TRIM_EN_CH              BIT(7)
  41
  42 #define TER_ADC_PD              BIT(30)
  43 #define TER_EN                  BIT(31)
  44 #define TRITSR_TEMP0_VAL_MASK   GENMASK(7, 0)
  45 #define TRITSR_TEMP1_VAL_MASK   GENMASK(23, 16)
  46
  47 #define PROBE_SEL_ALL           GENMASK(31, 30)
  48
  49 #define probe_status_offset(x)  (30 + x)
  50 #define SIGN_BIT                BIT(7)
  51 #define TEMP_VAL_MASK           GENMASK(6, 0)
  52
  53 /* TMU OCOTP calibration data bitfields */
  54 #define ANA0_EN                 BIT(25)
  55 #define ANA0_BUF_VREF_MASK      GENMASK(24, 20)
  56 #define ANA0_BUF_SLOPE_MASK     GENMASK(19, 16)
  57 #define ANA0_HR_MASK            GENMASK(15, 8)
  58 #define ANA0_RT_MASK            GENMASK(7, 0)
  59 #define TRIM2_VLSB_MASK         GENMASK(23, 20)
  60 #define TRIM2_BGR_MASK          GENMASK(19, 16)
  61 #define TRIM2_BJT_CUR_MASK      GENMASK(15, 12)
  62 #define TRIM2_BUF_SLOP_SEL_MASK GENMASK(11, 8)
  63 #define TRIM2_BUF_VERF_SEL_MASK GENMASK(7, 6)
  64 #define TRIM3_TCA25_0_LSB_MASK  GENMASK(31, 28)
  65 #define TRIM3_TCA40_0_MASK      GENMASK(27, 16)
  66 #define TRIM4_TCA40_1_MASK      GENMASK(31, 20)
  67 #define TRIM4_TCA105_0_MASK     GENMASK(19, 8)
  68 #define TRIM4_TCA25_0_MSB_MASK  GENMASK(7, 0)
  69 #define TRIM5_TCA105_1_MASK     GENMASK(23, 12)
  70 #define TRIM5_TCA25_1_MASK      GENMASK(11, 0)
  71
  72 #define VER1_TEMP_LOW_LIMIT     10000
  73 #define VER2_TEMP_LOW_LIMIT     -40000
  74 #define VER2_TEMP_HIGH_LIMIT    125000
  75
  76 #define TMU_VER1                0x1
  77 #define TMU_VER2                0x2
  78
  79 struct thermal_soc_data {
  80         u32 num_sensors;
  81         u32 version;
  82         int (*get_temp)(void *, int *);
  83 };
  84
  85 struct tmu_sensor {
  86         struct imx8mm_tmu *priv;
  87         u32 hw_id;
  88         struct thermal_zone_device *tzd;
  89 };
  90
  91 struct imx8mm_tmu {
  92         void __iomem *base;
  93         struct clk *clk;
  94         const struct thermal_soc_data *socdata;
  95         struct tmu_sensor sensors[];
  96 };
  97
  98 static int imx8mm_tmu_get_temp(void *data, int *temp)
  99 {
 100         struct tmu_sensor *sensor = data;
 101         struct imx8mm_tmu *tmu = sensor->priv;
 102         u32 val;
 103
 104         val = readl_relaxed(tmu->base + TRITSR) & TRITSR_TEMP0_VAL_MASK;
 105
 106         /*
 107          * Do not validate against the V bit (bit 31) due to errata
 108          * ERR051272: TMU: Bit 31 of registers TMU_TSCR/TMU_TRITSR/TMU_TRATSR invalid
 109          */
 110
 111         *temp = val * 1000;
 112         if (*temp < VER1_TEMP_LOW_LIMIT || *temp > VER2_TEMP_HIGH_LIMIT)
 113                 return -EAGAIN;
 114
 115         return 0;
 116 }
 117
 118 static int imx8mp_tmu_get_temp(void *data, int *temp)
 119 {
 120         struct tmu_sensor *sensor = data;
 121         struct imx8mm_tmu *tmu = sensor->priv;
 122         unsigned long val;
 123         bool ready;
 124
 125         val = readl_relaxed(tmu->base + TRITSR);
 126         ready = test_bit(probe_status_offset(sensor->hw_id), &val);
 127         if (!ready)
 128                 return -EAGAIN;
 129
 130         val = sensor->hw_id ? FIELD_GET(TRITSR_TEMP1_VAL_MASK, val) :
 131               FIELD_GET(TRITSR_TEMP0_VAL_MASK, val);
 132         if (val & SIGN_BIT) /* negative */
 133                 val = (~(val & TEMP_VAL_MASK) + 1);
 134
 135         *temp = val * 1000;
 136         if (*temp < VER2_TEMP_LOW_LIMIT || *temp > VER2_TEMP_HIGH_LIMIT)
 137                 return -EAGAIN;
 138
 139         return 0;
 140 }
 141
 142 static int tmu_get_temp(struct thermal_zone_device *tz, int *temp)
 143 {
 144         struct tmu_sensor *sensor = thermal_zone_device_priv(tz);
 145         struct imx8mm_tmu *tmu = sensor->priv;
 146
 147         return tmu->socdata->get_temp(sensor, temp);
 148 }
 149
 150 static const struct thermal_zone_device_ops tmu_tz_ops = {
 151         .get_temp = tmu_get_temp,
 152 };
 153
 154 static void imx8mm_tmu_enable(struct imx8mm_tmu *tmu, bool enable)
 155 {
 156         u32 val;
 157
 158         val = readl_relaxed(tmu->base + TER);
 159         val = enable ? (val | TER_EN) : (val & ~TER_EN);
 160         if (tmu->socdata->version == TMU_VER2)
 161                 val = enable ? (val & ~TER_ADC_PD) : (val | TER_ADC_PD);
 162         writel_relaxed(val, tmu->base + TER);
 163 }
 164
 165 static void imx8mm_tmu_probe_sel_all(struct imx8mm_tmu *tmu)
 166 {
 167         u32 val;
 168
 169         val = readl_relaxed(tmu->base + TPS);
 170         val |= PROBE_SEL_ALL;
 171         writel_relaxed(val, tmu->base + TPS);
 172 }
 173
 174 static int imx8mm_tmu_probe_set_calib_v1(struct platform_device *pdev,
 175                                          struct imx8mm_tmu *tmu)
 176 {
 177         struct device *dev = &pdev->dev;
 178         u32 ana0;
 179         int ret;
 180
 181         ret = nvmem_cell_read_u32(&pdev->dev, "calib", &ana0);
 182         if (ret) {
 183                 dev_warn(dev, "Failed to read OCOTP nvmem cell (%d).\n", ret);
 184                 return ret;
 185         }
 186
 187         writel(FIELD_PREP(TASR_BUF_VREF_MASK,
 188                           FIELD_GET(ANA0_BUF_VREF_MASK, ana0)) |
 189                FIELD_PREP(TASR_BUF_SLOPE_MASK,
 190                           FIELD_GET(ANA0_BUF_SLOPE_MASK, ana0)),
 191                tmu->base + TASR);
 192
 193         writel(FIELD_PREP(TCALIV_RT_MASK, FIELD_GET(ANA0_RT_MASK, ana0)) |
 194                FIELD_PREP(TCALIV_HR_MASK, FIELD_GET(ANA0_HR_MASK, ana0)) |
 195                ((ana0 & ANA0_EN) ? TCALIV_EN : 0),
 196                tmu->base + TCALIV(0));
 197
 198         return 0;
 199 }
 200
 201 static int imx8mm_tmu_probe_set_calib_v2(struct platform_device *pdev,
 202                                          struct imx8mm_tmu *tmu)
 203 {
 204         struct device *dev = &pdev->dev;
 205         struct nvmem_cell *cell;
 206         u32 trim[4] = { 0 };
 207         size_t len;
 208         void *buf;
 209
 210         cell = nvmem_cell_get(dev, "calib");
 211         if (IS_ERR(cell))
 212                 return PTR_ERR(cell);
 213
 214         buf = nvmem_cell_read(cell, &len);
 215         nvmem_cell_put(cell);
 216
 217         if (IS_ERR(buf))
 218                 return PTR_ERR(buf);
 219
 220         memcpy(trim, buf, min(len, sizeof(trim)));
 221         kfree(buf);
 222
 223         if (len != 16) {
 224                 dev_err(dev,
 225                         "OCOTP nvmem cell length is %zu, must be 16.\n", len);
 226                 return -EINVAL;
 227         }
 228
 229         /* Blank sample hardware */
 230         if (!trim[0] && !trim[1] && !trim[2] && !trim[3]) {
 231                 /* Use a default 25C binary codes */
 232                 writel(FIELD_PREP(TCALIV_SNSR25C_MASK, 0x63c),
 233                        tmu->base + TCALIV(0));
 234                 writel(FIELD_PREP(TCALIV_SNSR25C_MASK, 0x63c),
 235                        tmu->base + TCALIV(1));
 236                 return 0;
 237         }
 238
 239         writel(FIELD_PREP(TASR_BUF_VERF_SEL_MASK,
 240                           FIELD_GET(TRIM2_BUF_VERF_SEL_MASK, trim[0])) |
 241                FIELD_PREP(TASR_BUF_SLOPE_MASK,
 242                           FIELD_GET(TRIM2_BUF_SLOP_SEL_MASK, trim[0])),
 243                tmu->base + TASR);
 244
 245         writel(FIELD_PREP(TRIM_BJT_CUR_MASK,
 246                           FIELD_GET(TRIM2_BJT_CUR_MASK, trim[0])) |
 247                FIELD_PREP(TRIM_BGR_MASK, FIELD_GET(TRIM2_BGR_MASK, trim[0])) |
 248                FIELD_PREP(TRIM_VLSB_MASK, FIELD_GET(TRIM2_VLSB_MASK, trim[0])) |
 249                TRIM_EN_CH,
 250                tmu->base + TRIM);
 251
 252         writel(FIELD_PREP(TCALIV_SNSR25C_MASK,
 253                           FIELD_GET(TRIM3_TCA25_0_LSB_MASK, trim[1]) |
 254                           (FIELD_GET(TRIM4_TCA25_0_MSB_MASK, trim[2]) << 4)) |
 255                FIELD_PREP(TCALIV_SNSR105C_MASK,
 256                           FIELD_GET(TRIM4_TCA105_0_MASK, trim[2])),
 257                tmu->base + TCALIV(0));
 258
 259         writel(FIELD_PREP(TCALIV_SNSR25C_MASK,
 260                           FIELD_GET(TRIM5_TCA25_1_MASK, trim[3])) |
 261                FIELD_PREP(TCALIV_SNSR105C_MASK,
 262                           FIELD_GET(TRIM5_TCA105_1_MASK, trim[3])),
 263                tmu->base + TCALIV(1));
 264
 265         writel(FIELD_PREP(TCALIV_SNSR25C_MASK,
 266                           FIELD_GET(TRIM3_TCA40_0_MASK, trim[1])) |
 267                FIELD_PREP(TCALIV_SNSR105C_MASK,
 268                           FIELD_GET(TRIM4_TCA40_1_MASK, trim[2])),
 269                tmu->base + TCALIV(2));
 270
 271         return 0;
 272 }
 273
 274 static int imx8mm_tmu_probe_set_calib(struct platform_device *pdev,
 275                                       struct imx8mm_tmu *tmu)
 276 {
 277         struct device *dev = &pdev->dev;
 278
 279         /*
 280          * Lack of calibration data OCOTP reference is not considered
 281          * fatal to retain compatibility with old DTs. It is however
 282          * strongly recommended to update such old DTs to get correct
 283          * temperature compensation values for each SoC.
 284          */
 285         if (!of_property_present(pdev->dev.of_node, "nvmem-cells")) {
 286                 dev_warn(dev,
 287                          "No OCOTP nvmem reference found, SoC-specific calibration not loaded. Please update your DT.\n");
 288                 return 0;
 289         }
 290
 291         if (tmu->socdata->version == TMU_VER1)
 292                 return imx8mm_tmu_probe_set_calib_v1(pdev, tmu);
 293
 294         return imx8mm_tmu_probe_set_calib_v2(pdev, tmu);
 295 }
 296
 297 static int imx8mm_tmu_probe(struct platform_device *pdev)
 298 {
 299         const struct thermal_soc_data *data;
 300         struct imx8mm_tmu *tmu;
 301         int ret;
 302         int i;
 303
 304         data = of_device_get_match_data(&pdev->dev);
 305
 306         tmu = devm_kzalloc(&pdev->dev, struct_size(tmu, sensors,
 307                            data->num_sensors), GFP_KERNEL);
 308         if (!tmu)
 309                 return -ENOMEM;
 310
 311         tmu->socdata = data;
 312
 313         tmu->base = devm_platform_ioremap_resource(pdev, 0);
 314         if (IS_ERR(tmu->base))
 315                 return PTR_ERR(tmu->base);
 316
 317         tmu->clk = devm_clk_get(&pdev->dev, NULL);
 318         if (IS_ERR(tmu->clk))
 319                 return dev_err_probe(&pdev->dev, PTR_ERR(tmu->clk),
 320                                      "failed to get tmu clock\n");
 321
 322         ret = clk_prepare_enable(tmu->clk);
 323         if (ret) {
 324                 dev_err(&pdev->dev, "failed to enable tmu clock: %d\n", ret);
 325                 return ret;
 326         }
 327
 328         /* disable the monitor during initialization */
 329         imx8mm_tmu_enable(tmu, false);
 330
 331         for (i = 0; i < data->num_sensors; i++) {
 332                 tmu->sensors[i].priv = tmu;
 333                 tmu->sensors[i].tzd =
 334                         devm_thermal_of_zone_register(&pdev->dev, i,
 335                                                       &tmu->sensors[i],
 336                                                       &tmu_tz_ops);
 337                 if (IS_ERR(tmu->sensors[i].tzd)) {
 338                         ret = PTR_ERR(tmu->sensors[i].tzd);
 339                         dev_err(&pdev->dev,
 340                                 "failed to register thermal zone sensor[%d]: %d\n",
 341                                 i, ret);
 342                         goto disable_clk;
 343                 }
 344                 tmu->sensors[i].hw_id = i;
 345
 346                 devm_thermal_add_hwmon_sysfs(&pdev->dev, tmu->sensors[i].tzd);
 347         }
 348
 349         platform_set_drvdata(pdev, tmu);
 350
 351         ret = imx8mm_tmu_probe_set_calib(pdev, tmu);
 352         if (ret)
 353                 goto disable_clk;
 354
 355         /* enable all the probes for V2 TMU */
 356         if (tmu->socdata->version == TMU_VER2)
 357                 imx8mm_tmu_probe_sel_all(tmu);
 358
 359         /* enable the monitor */
 360         imx8mm_tmu_enable(tmu, true);
 361
 362         return 0;
 363
 364 disable_clk:
 365         clk_disable_unprepare(tmu->clk);
 366         return ret;
 367 }
 368
 369 static int imx8mm_tmu_remove(struct platform_device *pdev)
 370 {
 371         struct imx8mm_tmu *tmu = platform_get_drvdata(pdev);
 372
 373         /* disable TMU */
 374         imx8mm_tmu_enable(tmu, false);
 375
 376         clk_disable_unprepare(tmu->clk);
 377         platform_set_drvdata(pdev, NULL);
 378
 379         return 0;
 380 }
 381
 382 static struct thermal_soc_data imx8mm_tmu_data = {
 383         .num_sensors = 1,
 384         .version = TMU_VER1,
 385         .get_temp = imx8mm_tmu_get_temp,
 386 };
 387
 388 static struct thermal_soc_data imx8mp_tmu_data = {
 389         .num_sensors = 2,
 390         .version = TMU_VER2,
 391         .get_temp = imx8mp_tmu_get_temp,
 392 };
 393
 394 static const struct of_device_id imx8mm_tmu_table[] = {
 395         { .compatible = "fsl,imx8mm-tmu", .data = &imx8mm_tmu_data, },
 396         { .compatible = "fsl,imx8mp-tmu", .data = &imx8mp_tmu_data, },
 397         { },
 398 };
 399 MODULE_DEVICE_TABLE(of, imx8mm_tmu_table);
 400
 401 static struct platform_driver imx8mm_tmu = {
 402         .driver = {
 403                 .name   = "i.mx8mm_thermal",
 404                 .of_match_table = imx8mm_tmu_table,
 405         },
 406         .probe = imx8mm_tmu_probe,
 407         .remove = imx8mm_tmu_remove,
 408 };
 409 module_platform_driver(imx8mm_tmu);
 410
 411 MODULE_AUTHOR("Anson Huang <[email protected]>");
 412 MODULE_DESCRIPTION("i.MX8MM Thermal Monitor Unit driver");
 413 MODULE_LICENSE("GPL v2");