drivers/hwmon/smpro-hwmon.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Ampere Computing SoC's SMPro Hardware Monitoring Driver
   4  *
   5  * Copyright (c) 2022, Ampere Computing LLC
   6  */
   7 #include <linux/bitfield.h>
   8 #include <linux/bitops.h>
   9 #include <linux/hwmon.h>
  10 #include <linux/hwmon-sysfs.h>
  11 #include <linux/kernel.h>
  12 #include <linux/mod_devicetable.h>
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/property.h>
  16 #include <linux/regmap.h>
  17
  18 /* Logical Power Sensor Registers */
  19 #define SOC_TEMP                0x10
  20 #define SOC_VRD_TEMP            0x11
  21 #define DIMM_VRD_TEMP           0x12
  22 #define CORE_VRD_TEMP           0x13
  23 #define CH0_DIMM_TEMP           0x14
  24 #define CH1_DIMM_TEMP           0x15
  25 #define CH2_DIMM_TEMP           0x16
  26 #define CH3_DIMM_TEMP           0x17
  27 #define CH4_DIMM_TEMP           0x18
  28 #define CH5_DIMM_TEMP           0x19
  29 #define CH6_DIMM_TEMP           0x1A
  30 #define CH7_DIMM_TEMP           0x1B
  31 #define RCA_VRD_TEMP            0x1C
  32
  33 #define CORE_VRD_PWR            0x20
  34 #define SOC_PWR                 0x21
  35 #define DIMM_VRD1_PWR           0x22
  36 #define DIMM_VRD2_PWR           0x23
  37 #define CORE_VRD_PWR_MW         0x26
  38 #define SOC_PWR_MW              0x27
  39 #define DIMM_VRD1_PWR_MW        0x28
  40 #define DIMM_VRD2_PWR_MW        0x29
  41 #define RCA_VRD_PWR             0x2A
  42 #define RCA_VRD_PWR_MW          0x2B
  43
  44 #define MEM_HOT_THRESHOLD       0x32
  45 #define SOC_VR_HOT_THRESHOLD    0x33
  46 #define CORE_VRD_VOLT           0x34
  47 #define SOC_VRD_VOLT            0x35
  48 #define DIMM_VRD1_VOLT          0x36
  49 #define DIMM_VRD2_VOLT          0x37
  50 #define RCA_VRD_VOLT            0x38
  51
  52 #define CORE_VRD_CURR           0x39
  53 #define SOC_VRD_CURR            0x3A
  54 #define DIMM_VRD1_CURR          0x3B
  55 #define DIMM_VRD2_CURR          0x3C
  56 #define RCA_VRD_CURR            0x3D
  57
  58 struct smpro_hwmon {
  59         struct regmap *regmap;
  60 };
  61
  62 struct smpro_sensor {
  63         const u8 reg;
  64         const u8 reg_ext;
  65         const char *label;
  66 };
  67
  68 static const struct smpro_sensor temperature[] = {
  69         {
  70                 .reg = SOC_TEMP,
  71                 .label = "temp1 SoC"
  72         },
  73         {
  74                 .reg = SOC_VRD_TEMP,
  75                 .reg_ext = SOC_VR_HOT_THRESHOLD,
  76                 .label = "temp2 SoC VRD"
  77         },
  78         {
  79                 .reg = DIMM_VRD_TEMP,
  80                 .label = "temp3 DIMM VRD"
  81         },
  82         {
  83                 .reg = CORE_VRD_TEMP,
  84                 .label = "temp4 CORE VRD"
  85         },
  86         {
  87                 .reg = CH0_DIMM_TEMP,
  88                 .reg_ext = MEM_HOT_THRESHOLD,
  89                 .label = "temp5 CH0 DIMM"
  90         },
  91         {
  92                 .reg = CH1_DIMM_TEMP,
  93                 .reg_ext = MEM_HOT_THRESHOLD,
  94                 .label = "temp6 CH1 DIMM"
  95         },
  96         {
  97                 .reg = CH2_DIMM_TEMP,
  98                 .reg_ext = MEM_HOT_THRESHOLD,
  99                 .label = "temp7 CH2 DIMM"
 100         },
 101         {
 102                 .reg = CH3_DIMM_TEMP,
 103                 .reg_ext = MEM_HOT_THRESHOLD,
 104                 .label = "temp8 CH3 DIMM"
 105         },
 106         {
 107                 .reg = CH4_DIMM_TEMP,
 108                 .reg_ext = MEM_HOT_THRESHOLD,
 109                 .label = "temp9 CH4 DIMM"
 110         },
 111         {
 112                 .reg = CH5_DIMM_TEMP,
 113                 .reg_ext = MEM_HOT_THRESHOLD,
 114                 .label = "temp10 CH5 DIMM"
 115         },
 116         {
 117                 .reg = CH6_DIMM_TEMP,
 118                 .reg_ext = MEM_HOT_THRESHOLD,
 119                 .label = "temp11 CH6 DIMM"
 120         },
 121         {
 122                 .reg = CH7_DIMM_TEMP,
 123                 .reg_ext = MEM_HOT_THRESHOLD,
 124                 .label = "temp12 CH7 DIMM"
 125         },
 126         {
 127                 .reg = RCA_VRD_TEMP,
 128                 .label = "temp13 RCA VRD"
 129         },
 130 };
 131
 132 static const struct smpro_sensor voltage[] = {
 133         {
 134                 .reg = CORE_VRD_VOLT,
 135                 .label = "vout0 CORE VRD"
 136         },
 137         {
 138                 .reg = SOC_VRD_VOLT,
 139                 .label = "vout1 SoC VRD"
 140         },
 141         {
 142                 .reg = DIMM_VRD1_VOLT,
 143                 .label = "vout2 DIMM VRD1"
 144         },
 145         {
 146                 .reg = DIMM_VRD2_VOLT,
 147                 .label = "vout3 DIMM VRD2"
 148         },
 149         {
 150                 .reg = RCA_VRD_VOLT,
 151                 .label = "vout4 RCA VRD"
 152         },
 153 };
 154
 155 static const struct smpro_sensor curr_sensor[] = {
 156         {
 157                 .reg = CORE_VRD_CURR,
 158                 .label = "iout1 CORE VRD"
 159         },
 160         {
 161                 .reg = SOC_VRD_CURR,
 162                 .label = "iout2 SoC VRD"
 163         },
 164         {
 165                 .reg = DIMM_VRD1_CURR,
 166                 .label = "iout3 DIMM VRD1"
 167         },
 168         {
 169                 .reg = DIMM_VRD2_CURR,
 170                 .label = "iout4 DIMM VRD2"
 171         },
 172         {
 173                 .reg = RCA_VRD_CURR,
 174                 .label = "iout5 RCA VRD"
 175         },
 176 };
 177
 178 static const struct smpro_sensor power[] = {
 179         {
 180                 .reg = CORE_VRD_PWR,
 181                 .reg_ext = CORE_VRD_PWR_MW,
 182                 .label = "power1 CORE VRD"
 183         },
 184         {
 185                 .reg = SOC_PWR,
 186                 .reg_ext = SOC_PWR_MW,
 187                 .label = "power2 SoC"
 188         },
 189         {
 190                 .reg = DIMM_VRD1_PWR,
 191                 .reg_ext = DIMM_VRD1_PWR_MW,
 192                 .label = "power3 DIMM VRD1"
 193         },
 194         {
 195                 .reg = DIMM_VRD2_PWR,
 196                 .reg_ext = DIMM_VRD2_PWR_MW,
 197                 .label = "power4 DIMM VRD2"
 198         },
 199         {
 200                 .reg = RCA_VRD_PWR,
 201                 .reg_ext = RCA_VRD_PWR_MW,
 202                 .label = "power5 RCA VRD"
 203         },
 204 };
 205
 206 static int smpro_read_temp(struct device *dev, u32 attr, int channel, long *val)
 207 {
 208         struct smpro_hwmon *hwmon = dev_get_drvdata(dev);
 209         unsigned int value;
 210         int ret;
 211
 212         switch (attr) {
 213         case hwmon_temp_input:
 214                 ret = regmap_read(hwmon->regmap, temperature[channel].reg, &value);
 215                 if (ret)
 216                         return ret;
 217                 break;
 218         case hwmon_temp_crit:
 219                 ret = regmap_read(hwmon->regmap, temperature[channel].reg_ext, &value);
 220                 if (ret)
 221                         return ret;
 222                 break;
 223         default:
 224                 return -EOPNOTSUPP;
 225         }
 226
 227         *val = sign_extend32(value, 8) * 1000;
 228         return 0;
 229 }
 230
 231 static int smpro_read_in(struct device *dev, u32 attr, int channel, long *val)
 232 {
 233         struct smpro_hwmon *hwmon = dev_get_drvdata(dev);
 234         unsigned int value;
 235         int ret;
 236
 237         switch (attr) {
 238         case hwmon_in_input:
 239                 ret = regmap_read(hwmon->regmap, voltage[channel].reg, &value);
 240                 if (ret < 0)
 241                         return ret;
 242                 /* 15-bit value in 1mV */
 243                 *val = value & 0x7fff;
 244                 return 0;
 245         default:
 246                 return -EOPNOTSUPP;
 247         }
 248 }
 249
 250 static int smpro_read_curr(struct device *dev, u32 attr, int channel, long *val)
 251 {
 252         struct smpro_hwmon *hwmon = dev_get_drvdata(dev);
 253         unsigned int value;
 254         int ret;
 255
 256         switch (attr) {
 257         case hwmon_curr_input:
 258                 ret = regmap_read(hwmon->regmap, curr_sensor[channel].reg, &value);
 259                 if (ret < 0)
 260                         return ret;
 261                 /* Scale reported by the hardware is 1mA */
 262                 *val = value & 0x7fff;
 263                 return 0;
 264         default:
 265                 return -EOPNOTSUPP;
 266         }
 267 }
 268
 269 static int smpro_read_power(struct device *dev, u32 attr, int channel, long *val_pwr)
 270 {
 271         struct smpro_hwmon *hwmon = dev_get_drvdata(dev);
 272         unsigned int val = 0, val_mw = 0;
 273         int ret;
 274
 275         switch (attr) {
 276         case hwmon_power_input:
 277                 ret = regmap_read(hwmon->regmap, power[channel].reg, &val);
 278                 if (ret)
 279                         return ret;
 280
 281                 ret = regmap_read(hwmon->regmap, power[channel].reg_ext, &val_mw);
 282                 if (ret)
 283                         return ret;
 284                 /* 10-bit value */
 285                 *val_pwr = (val & 0x3ff) * 1000000 + (val_mw & 0x3ff) * 1000;
 286                 return 0;
 287
 288         default:
 289                 return -EOPNOTSUPP;
 290         }
 291 }
 292
 293 static int smpro_read(struct device *dev, enum hwmon_sensor_types type,
 294                       u32 attr, int channel, long *val)
 295 {
 296         switch (type) {
 297         case hwmon_temp:
 298                 return smpro_read_temp(dev, attr, channel, val);
 299         case hwmon_in:
 300                 return smpro_read_in(dev, attr, channel, val);
 301         case hwmon_power:
 302                 return smpro_read_power(dev, attr, channel, val);
 303         case hwmon_curr:
 304                 return smpro_read_curr(dev, attr, channel, val);
 305         default:
 306                 return -EOPNOTSUPP;
 307         }
 308 }
 309
 310 static int smpro_read_string(struct device *dev, enum hwmon_sensor_types type,
 311                              u32 attr, int channel, const char **str)
 312 {
 313         switch (type) {
 314         case hwmon_temp:
 315                 switch (attr) {
 316                 case hwmon_temp_label:
 317                         *str = temperature[channel].label;
 318                         return 0;
 319                 default:
 320                         break;
 321                 }
 322                 break;
 323
 324         case hwmon_in:
 325                 switch (attr) {
 326                 case hwmon_in_label:
 327                         *str = voltage[channel].label;
 328                         return 0;
 329                 default:
 330                         break;
 331                 }
 332                 break;
 333
 334         case hwmon_curr:
 335                 switch (attr) {
 336                 case hwmon_curr_label:
 337                         *str = curr_sensor[channel].label;
 338                         return 0;
 339                 default:
 340                         break;
 341                 }
 342                 break;
 343
 344         case hwmon_power:
 345                 switch (attr) {
 346                 case hwmon_power_label:
 347                         *str = power[channel].label;
 348                         return 0;
 349                 default:
 350                         break;
 351                 }
 352                 break;
 353         default:
 354                 break;
 355         }
 356
 357         return -EOPNOTSUPP;
 358 }
 359
 360 static umode_t smpro_is_visible(const void *data, enum hwmon_sensor_types type,
 361                                 u32 attr, int channel)
 362 {
 363         const struct smpro_hwmon *hwmon = data;
 364         unsigned int value;
 365         int ret;
 366
 367         switch (type) {
 368         case hwmon_temp:
 369                 switch (attr) {
 370                 case hwmon_temp_input:
 371                 case hwmon_temp_label:
 372                 case hwmon_temp_crit:
 373                         ret = regmap_read(hwmon->regmap, temperature[channel].reg, &value);
 374                         if (ret || value == 0xFFFF)
 375                                 return 0;
 376                         break;
 377                 default:
 378                         break;
 379                 }
 380                 break;
 381         default:
 382                 break;
 383         }
 384
 385         return 0444;
 386 }
 387
 388 static const struct hwmon_channel_info * const smpro_info[] = {
 389         HWMON_CHANNEL_INFO(temp,
 390                            HWMON_T_INPUT | HWMON_T_LABEL,
 391                            HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
 392                            HWMON_T_INPUT | HWMON_T_LABEL,
 393                            HWMON_T_INPUT | HWMON_T_LABEL,
 394                            HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
 395                            HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
 396                            HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
 397                            HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
 398                            HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
 399                            HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
 400                            HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
 401                            HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
 402                            HWMON_T_INPUT | HWMON_T_LABEL),
 403         HWMON_CHANNEL_INFO(in,
 404                            HWMON_I_INPUT | HWMON_I_LABEL,
 405                            HWMON_I_INPUT | HWMON_I_LABEL,
 406                            HWMON_I_INPUT | HWMON_I_LABEL,
 407                            HWMON_I_INPUT | HWMON_I_LABEL,
 408                            HWMON_I_INPUT | HWMON_I_LABEL),
 409         HWMON_CHANNEL_INFO(power,
 410                            HWMON_P_INPUT | HWMON_P_LABEL,
 411                            HWMON_P_INPUT | HWMON_P_LABEL,
 412                            HWMON_P_INPUT | HWMON_P_LABEL,
 413                            HWMON_P_INPUT | HWMON_P_LABEL,
 414                            HWMON_P_INPUT | HWMON_P_LABEL),
 415         HWMON_CHANNEL_INFO(curr,
 416                            HWMON_C_INPUT | HWMON_C_LABEL,
 417                            HWMON_C_INPUT | HWMON_C_LABEL,
 418                            HWMON_C_INPUT | HWMON_C_LABEL,
 419                            HWMON_C_INPUT | HWMON_C_LABEL,
 420                            HWMON_C_INPUT | HWMON_C_LABEL),
 421         NULL
 422 };
 423
 424 static const struct hwmon_ops smpro_hwmon_ops = {
 425         .is_visible = smpro_is_visible,
 426         .read = smpro_read,
 427         .read_string = smpro_read_string,
 428 };
 429
 430 static const struct hwmon_chip_info smpro_chip_info = {
 431         .ops = &smpro_hwmon_ops,
 432         .info = smpro_info,
 433 };
 434
 435 static int smpro_hwmon_probe(struct platform_device *pdev)
 436 {
 437         struct smpro_hwmon *hwmon;
 438         struct device *hwmon_dev;
 439
 440         hwmon = devm_kzalloc(&pdev->dev, sizeof(struct smpro_hwmon), GFP_KERNEL);
 441         if (!hwmon)
 442                 return -ENOMEM;
 443
 444         hwmon->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 445         if (!hwmon->regmap)
 446                 return -ENODEV;
 447
 448         hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, "smpro_hwmon",
 449                                                          hwmon, &smpro_chip_info, NULL);
 450
 451         return PTR_ERR_OR_ZERO(hwmon_dev);
 452 }
 453
 454 static struct platform_driver smpro_hwmon_driver = {
 455         .probe          = smpro_hwmon_probe,
 456         .driver = {
 457                 .name   = "smpro-hwmon",
 458         },
 459 };
 460
 461 module_platform_driver(smpro_hwmon_driver);
 462
 463 MODULE_AUTHOR("Thu Nguyen <thu@os.amperecomputing.com>");
 464 MODULE_AUTHOR("Quan Nguyen <quan@os.amperecomputing.com>");
 465 MODULE_DESCRIPTION("Ampere Altra SMPro hwmon driver");
 466 MODULE_LICENSE("GPL");