drivers/thermal/intel/intel_soc_dts_iosf.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * intel_soc_dts_iosf.c
   4  * Copyright (c) 2015, Intel Corporation.
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   8
   9 #include <linux/bitops.h>
  10 #include <linux/module.h>
  11 #include <linux/slab.h>
  12 #include <linux/interrupt.h>
  13 #include <asm/iosf_mbi.h>
  14 #include "intel_soc_dts_iosf.h"
  15
  16 #define SOC_DTS_OFFSET_ENABLE           0xB0
  17 #define SOC_DTS_OFFSET_TEMP             0xB1
  18
  19 #define SOC_DTS_OFFSET_PTPS             0xB2
  20 #define SOC_DTS_OFFSET_PTTS             0xB3
  21 #define SOC_DTS_OFFSET_PTTSS            0xB4
  22 #define SOC_DTS_OFFSET_PTMC             0x80
  23 #define SOC_DTS_TE_AUX0                 0xB5
  24 #define SOC_DTS_TE_AUX1                 0xB6
  25
  26 #define SOC_DTS_AUX0_ENABLE_BIT         BIT(0)
  27 #define SOC_DTS_AUX1_ENABLE_BIT         BIT(1)
  28 #define SOC_DTS_CPU_MODULE0_ENABLE_BIT  BIT(16)
  29 #define SOC_DTS_CPU_MODULE1_ENABLE_BIT  BIT(17)
  30 #define SOC_DTS_TE_SCI_ENABLE           BIT(9)
  31 #define SOC_DTS_TE_SMI_ENABLE           BIT(10)
  32 #define SOC_DTS_TE_MSI_ENABLE           BIT(11)
  33 #define SOC_DTS_TE_APICA_ENABLE         BIT(14)
  34 #define SOC_DTS_PTMC_APIC_DEASSERT_BIT  BIT(4)
  35
  36 /* DTS encoding for TJ MAX temperature */
  37 #define SOC_DTS_TJMAX_ENCODING          0x7F
  38
  39 /* Only 2 out of 4 is allowed for OSPM */
  40 #define SOC_MAX_DTS_TRIPS               2
  41
  42 /* Mask for two trips in status bits */
  43 #define SOC_DTS_TRIP_MASK               0x03
  44
  45 /* DTS0 and DTS 1 */
  46 #define SOC_MAX_DTS_SENSORS             2
  47
  48 static int get_tj_max(u32 *tj_max)
  49 {
  50         u32 eax, edx;
  51         u32 val;
  52         int err;
  53
  54         err = rdmsr_safe(MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
  55         if (err)
  56                 goto err_ret;
  57         else {
  58                 val = (eax >> 16) & 0xff;
  59                 if (val)
  60                         *tj_max = val * 1000;
  61                 else {
  62                         err = -EINVAL;
  63                         goto err_ret;
  64                 }
  65         }
  66
  67         return 0;
  68 err_ret:
  69         *tj_max = 0;
  70
  71         return err;
  72 }
  73
  74 static int sys_get_trip_temp(struct thermal_zone_device *tzd, int trip,
  75                              int *temp)
  76 {
  77         int status;
  78         u32 out;
  79         struct intel_soc_dts_sensor_entry *dts;
  80         struct intel_soc_dts_sensors *sensors;
  81
  82         dts = tzd->devdata;
  83         sensors = dts->sensors;
  84         mutex_lock(&sensors->dts_update_lock);
  85         status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
  86                                SOC_DTS_OFFSET_PTPS, &out);
  87         mutex_unlock(&sensors->dts_update_lock);
  88         if (status)
  89                 return status;
  90
  91         out = (out >> (trip * 8)) & SOC_DTS_TJMAX_ENCODING;
  92         if (!out)
  93                 *temp = 0;
  94         else
  95                 *temp = sensors->tj_max - out * 1000;
  96
  97         return 0;
  98 }
  99
 100 static int update_trip_temp(struct intel_soc_dts_sensor_entry *dts,
 101                             int thres_index, int temp,
 102                             enum thermal_trip_type trip_type)
 103 {
 104         int status;
 105         u32 temp_out;
 106         u32 out;
 107         unsigned long update_ptps;
 108         u32 store_ptps;
 109         u32 store_ptmc;
 110         u32 store_te_out;
 111         u32 te_out;
 112         u32 int_enable_bit = SOC_DTS_TE_APICA_ENABLE;
 113         struct intel_soc_dts_sensors *sensors = dts->sensors;
 114
 115         if (sensors->intr_type == INTEL_SOC_DTS_INTERRUPT_MSI)
 116                 int_enable_bit |= SOC_DTS_TE_MSI_ENABLE;
 117
 118         temp_out = (sensors->tj_max - temp) / 1000;
 119
 120         status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
 121                                SOC_DTS_OFFSET_PTPS, &store_ptps);
 122         if (status)
 123                 return status;
 124
 125         update_ptps = store_ptps;
 126         bitmap_set_value8(&update_ptps, temp_out & 0xFF, thres_index * 8);
 127         out = update_ptps;
 128
 129         status = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
 130                                 SOC_DTS_OFFSET_PTPS, out);
 131         if (status)
 132                 return status;
 133
 134         pr_debug("update_trip_temp PTPS = %x\n", out);
 135         status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
 136                                SOC_DTS_OFFSET_PTMC, &out);
 137         if (status)
 138                 goto err_restore_ptps;
 139
 140         store_ptmc = out;
 141
 142         status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
 143                                SOC_DTS_TE_AUX0 + thres_index,
 144                                &te_out);
 145         if (status)
 146                 goto err_restore_ptmc;
 147
 148         store_te_out = te_out;
 149         /* Enable for CPU module 0 and module 1 */
 150         out |= (SOC_DTS_CPU_MODULE0_ENABLE_BIT |
 151                                         SOC_DTS_CPU_MODULE1_ENABLE_BIT);
 152         if (temp) {
 153                 if (thres_index)
 154                         out |= SOC_DTS_AUX1_ENABLE_BIT;
 155                 else
 156                         out |= SOC_DTS_AUX0_ENABLE_BIT;
 157                 te_out |= int_enable_bit;
 158         } else {
 159                 if (thres_index)
 160                         out &= ~SOC_DTS_AUX1_ENABLE_BIT;
 161                 else
 162                         out &= ~SOC_DTS_AUX0_ENABLE_BIT;
 163                 te_out &= ~int_enable_bit;
 164         }
 165         status = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
 166                                 SOC_DTS_OFFSET_PTMC, out);
 167         if (status)
 168                 goto err_restore_te_out;
 169
 170         status = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
 171                                 SOC_DTS_TE_AUX0 + thres_index,
 172                                 te_out);
 173         if (status)
 174                 goto err_restore_te_out;
 175
 176         dts->trip_types[thres_index] = trip_type;
 177
 178         return 0;
 179 err_restore_te_out:
 180         iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
 181                        SOC_DTS_OFFSET_PTMC, store_te_out);
 182 err_restore_ptmc:
 183         iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
 184                        SOC_DTS_OFFSET_PTMC, store_ptmc);
 185 err_restore_ptps:
 186         iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
 187                        SOC_DTS_OFFSET_PTPS, store_ptps);
 188         /* Nothing we can do if restore fails */
 189
 190         return status;
 191 }
 192
 193 static int sys_set_trip_temp(struct thermal_zone_device *tzd, int trip,
 194                              int temp)
 195 {
 196         struct intel_soc_dts_sensor_entry *dts = tzd->devdata;
 197         struct intel_soc_dts_sensors *sensors = dts->sensors;
 198         int status;
 199
 200         if (temp > sensors->tj_max)
 201                 return -EINVAL;
 202
 203         mutex_lock(&sensors->dts_update_lock);
 204         status = update_trip_temp(tzd->devdata, trip, temp,
 205                                   dts->trip_types[trip]);
 206         mutex_unlock(&sensors->dts_update_lock);
 207
 208         return status;
 209 }
 210
 211 static int sys_get_trip_type(struct thermal_zone_device *tzd,
 212                              int trip, enum thermal_trip_type *type)
 213 {
 214         struct intel_soc_dts_sensor_entry *dts;
 215
 216         dts = tzd->devdata;
 217
 218         *type = dts->trip_types[trip];
 219
 220         return 0;
 221 }
 222
 223 static int sys_get_curr_temp(struct thermal_zone_device *tzd,
 224                              int *temp)
 225 {
 226         int status;
 227         u32 out;
 228         struct intel_soc_dts_sensor_entry *dts;
 229         struct intel_soc_dts_sensors *sensors;
 230         unsigned long raw;
 231
 232         dts = tzd->devdata;
 233         sensors = dts->sensors;
 234         status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
 235                                SOC_DTS_OFFSET_TEMP, &out);
 236         if (status)
 237                 return status;
 238
 239         raw = out;
 240         out = bitmap_get_value8(&raw, dts->id * 8) - SOC_DTS_TJMAX_ENCODING;
 241         *temp = sensors->tj_max - out * 1000;
 242
 243         return 0;
 244 }
 245
 246 static struct thermal_zone_device_ops tzone_ops = {
 247         .get_temp = sys_get_curr_temp,
 248         .get_trip_temp = sys_get_trip_temp,
 249         .get_trip_type = sys_get_trip_type,
 250         .set_trip_temp = sys_set_trip_temp,
 251 };
 252
 253 static int soc_dts_enable(int id)
 254 {
 255         u32 out;
 256         int ret;
 257
 258         ret = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
 259                             SOC_DTS_OFFSET_ENABLE, &out);
 260         if (ret)
 261                 return ret;
 262
 263         if (!(out & BIT(id))) {
 264                 out |= BIT(id);
 265                 ret = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
 266                                      SOC_DTS_OFFSET_ENABLE, out);
 267                 if (ret)
 268                         return ret;
 269         }
 270
 271         return ret;
 272 }
 273
 274 static void remove_dts_thermal_zone(struct intel_soc_dts_sensor_entry *dts)
 275 {
 276         if (dts) {
 277                 iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
 278                                SOC_DTS_OFFSET_ENABLE, dts->store_status);
 279                 thermal_zone_device_unregister(dts->tzone);
 280         }
 281 }
 282
 283 static int add_dts_thermal_zone(int id, struct intel_soc_dts_sensor_entry *dts,
 284                                 bool notification_support, int trip_cnt,
 285                                 int read_only_trip_cnt)
 286 {
 287         char name[10];
 288         unsigned long trip;
 289         int trip_count = 0;
 290         int trip_mask = 0;
 291         int writable_trip_cnt = 0;
 292         unsigned long ptps;
 293         u32 store_ptps;
 294         unsigned long i;
 295         int ret;
 296
 297         /* Store status to restor on exit */
 298         ret = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
 299                             SOC_DTS_OFFSET_ENABLE, &dts->store_status);
 300         if (ret)
 301                 goto err_ret;
 302
 303         dts->id = id;
 304         if (notification_support) {
 305                 trip_count = min(SOC_MAX_DTS_TRIPS, trip_cnt);
 306                 writable_trip_cnt = trip_count - read_only_trip_cnt;
 307                 trip_mask = GENMASK(writable_trip_cnt - 1, 0);
 308         }
 309
 310         /* Check if the writable trip we provide is not used by BIOS */
 311         ret = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
 312                             SOC_DTS_OFFSET_PTPS, &store_ptps);
 313         if (ret)
 314                 trip_mask = 0;
 315         else {
 316                 ptps = store_ptps;
 317                 for_each_set_clump8(i, trip, &ptps, writable_trip_cnt * 8)
 318                         trip_mask &= ~BIT(i / 8);
 319         }
 320         dts->trip_mask = trip_mask;
 321         dts->trip_count = trip_count;
 322         snprintf(name, sizeof(name), "soc_dts%d", id);
 323         dts->tzone = thermal_zone_device_register(name,
 324                                                   trip_count,
 325                                                   trip_mask,
 326                                                   dts, &tzone_ops,
 327                                                   NULL, 0, 0);
 328         if (IS_ERR(dts->tzone)) {
 329                 ret = PTR_ERR(dts->tzone);
 330                 goto err_ret;
 331         }
 332
 333         ret = soc_dts_enable(id);
 334         if (ret)
 335                 goto err_enable;
 336
 337         return 0;
 338 err_enable:
 339         thermal_zone_device_unregister(dts->tzone);
 340 err_ret:
 341         return ret;
 342 }
 343
 344 int intel_soc_dts_iosf_add_read_only_critical_trip(
 345         struct intel_soc_dts_sensors *sensors, int critical_offset)
 346 {
 347         int i, j;
 348
 349         for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
 350                 for (j = 0; j < sensors->soc_dts[i].trip_count; ++j) {
 351                         if (!(sensors->soc_dts[i].trip_mask & BIT(j))) {
 352                                 return update_trip_temp(&sensors->soc_dts[i], j,
 353                                         sensors->tj_max - critical_offset,
 354                                         THERMAL_TRIP_CRITICAL);
 355                         }
 356                 }
 357         }
 358
 359         return -EINVAL;
 360 }
 361 EXPORT_SYMBOL_GPL(intel_soc_dts_iosf_add_read_only_critical_trip);
 362
 363 void intel_soc_dts_iosf_interrupt_handler(struct intel_soc_dts_sensors *sensors)
 364 {
 365         u32 sticky_out;
 366         int status;
 367         u32 ptmc_out;
 368         unsigned long flags;
 369
 370         spin_lock_irqsave(&sensors->intr_notify_lock, flags);
 371
 372         status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
 373                                SOC_DTS_OFFSET_PTMC, &ptmc_out);
 374         ptmc_out |= SOC_DTS_PTMC_APIC_DEASSERT_BIT;
 375         status = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
 376                                 SOC_DTS_OFFSET_PTMC, ptmc_out);
 377
 378         status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
 379                                SOC_DTS_OFFSET_PTTSS, &sticky_out);
 380         pr_debug("status %d PTTSS %x\n", status, sticky_out);
 381         if (sticky_out & SOC_DTS_TRIP_MASK) {
 382                 int i;
 383                 /* reset sticky bit */
 384                 status = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
 385                                         SOC_DTS_OFFSET_PTTSS, sticky_out);
 386                 spin_unlock_irqrestore(&sensors->intr_notify_lock, flags);
 387
 388                 for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
 389                         pr_debug("TZD update for zone %d\n", i);
 390                         thermal_zone_device_update(sensors->soc_dts[i].tzone,
 391                                                    THERMAL_EVENT_UNSPECIFIED);
 392                 }
 393         } else
 394                 spin_unlock_irqrestore(&sensors->intr_notify_lock, flags);
 395 }
 396 EXPORT_SYMBOL_GPL(intel_soc_dts_iosf_interrupt_handler);
 397
 398 struct intel_soc_dts_sensors *intel_soc_dts_iosf_init(
 399         enum intel_soc_dts_interrupt_type intr_type, int trip_count,
 400         int read_only_trip_count)
 401 {
 402         struct intel_soc_dts_sensors *sensors;
 403         bool notification;
 404         u32 tj_max;
 405         int ret;
 406         int i;
 407
 408         if (!iosf_mbi_available())
 409                 return ERR_PTR(-ENODEV);
 410
 411         if (!trip_count || read_only_trip_count > trip_count)
 412                 return ERR_PTR(-EINVAL);
 413
 414         if (get_tj_max(&tj_max))
 415                 return ERR_PTR(-EINVAL);
 416
 417         sensors = kzalloc(sizeof(*sensors), GFP_KERNEL);
 418         if (!sensors)
 419                 return ERR_PTR(-ENOMEM);
 420
 421         spin_lock_init(&sensors->intr_notify_lock);
 422         mutex_init(&sensors->dts_update_lock);
 423         sensors->intr_type = intr_type;
 424         sensors->tj_max = tj_max;
 425         if (intr_type == INTEL_SOC_DTS_INTERRUPT_NONE)
 426                 notification = false;
 427         else
 428                 notification = true;
 429         for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
 430                 sensors->soc_dts[i].sensors = sensors;
 431                 ret = add_dts_thermal_zone(i, &sensors->soc_dts[i],
 432                                            notification, trip_count,
 433                                            read_only_trip_count);
 434                 if (ret)
 435                         goto err_free;
 436         }
 437
 438         for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
 439                 ret = update_trip_temp(&sensors->soc_dts[i], 0, 0,
 440                                        THERMAL_TRIP_PASSIVE);
 441                 if (ret)
 442                         goto err_remove_zone;
 443
 444                 ret = update_trip_temp(&sensors->soc_dts[i], 1, 0,
 445                                        THERMAL_TRIP_PASSIVE);
 446                 if (ret)
 447                         goto err_remove_zone;
 448         }
 449
 450         return sensors;
 451 err_remove_zone:
 452         for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i)
 453                 remove_dts_thermal_zone(&sensors->soc_dts[i]);
 454
 455 err_free:
 456         kfree(sensors);
 457         return ERR_PTR(ret);
 458 }
 459 EXPORT_SYMBOL_GPL(intel_soc_dts_iosf_init);
 460
 461 void intel_soc_dts_iosf_exit(struct intel_soc_dts_sensors *sensors)
 462 {
 463         int i;
 464
 465         for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
 466                 update_trip_temp(&sensors->soc_dts[i], 0, 0, 0);
 467                 update_trip_temp(&sensors->soc_dts[i], 1, 0, 0);
 468                 remove_dts_thermal_zone(&sensors->soc_dts[i]);
 469         }
 470         kfree(sensors);
 471 }
 472 EXPORT_SYMBOL_GPL(intel_soc_dts_iosf_exit);
 473
 474 MODULE_LICENSE("GPL v2");