drivers/thermal/intel_soc_dts_iosf.c

   1 /*
   2  * intel_soc_dts_iosf.c
   3  * Copyright (c) 2015, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  */
  15
  16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  17
  18 #include <linux/module.h>
  19 #include <linux/slab.h>
  20 #include <linux/interrupt.h>
  21 #include <asm/iosf_mbi.h>
  22 #include "intel_soc_dts_iosf.h"
  23
  24 #define SOC_DTS_OFFSET_ENABLE           0xB0
  25 #define SOC_DTS_OFFSET_TEMP             0xB1
  26
  27 #define SOC_DTS_OFFSET_PTPS             0xB2
  28 #define SOC_DTS_OFFSET_PTTS             0xB3
  29 #define SOC_DTS_OFFSET_PTTSS            0xB4
  30 #define SOC_DTS_OFFSET_PTMC             0x80
  31 #define SOC_DTS_TE_AUX0                 0xB5
  32 #define SOC_DTS_TE_AUX1                 0xB6
  33
  34 #define SOC_DTS_AUX0_ENABLE_BIT         BIT(0)
  35 #define SOC_DTS_AUX1_ENABLE_BIT         BIT(1)
  36 #define SOC_DTS_CPU_MODULE0_ENABLE_BIT  BIT(16)
  37 #define SOC_DTS_CPU_MODULE1_ENABLE_BIT  BIT(17)
  38 #define SOC_DTS_TE_SCI_ENABLE           BIT(9)
  39 #define SOC_DTS_TE_SMI_ENABLE           BIT(10)
  40 #define SOC_DTS_TE_MSI_ENABLE           BIT(11)
  41 #define SOC_DTS_TE_APICA_ENABLE         BIT(14)
  42 #define SOC_DTS_PTMC_APIC_DEASSERT_BIT  BIT(4)
  43
  44 /* DTS encoding for TJ MAX temperature */
  45 #define SOC_DTS_TJMAX_ENCODING          0x7F
  46
  47 /* Only 2 out of 4 is allowed for OSPM */
  48 #define SOC_MAX_DTS_TRIPS               2
  49
  50 /* Mask for two trips in status bits */
  51 #define SOC_DTS_TRIP_MASK               0x03
  52
  53 /* DTS0 and DTS 1 */
  54 #define SOC_MAX_DTS_SENSORS             2
  55
  56 static int get_tj_max(u32 *tj_max)
  57 {
  58         u32 eax, edx;
  59         u32 val;
  60         int err;
  61
  62         err = rdmsr_safe(MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
  63         if (err)
  64                 goto err_ret;
  65         else {
  66                 val = (eax >> 16) & 0xff;
  67                 if (val)
  68                         *tj_max = val * 1000;
  69                 else {
  70                         err = -EINVAL;
  71                         goto err_ret;
  72                 }
  73         }
  74
  75         return 0;
  76 err_ret:
  77         *tj_max = 0;
  78
  79         return err;
  80 }
  81
  82 static int sys_get_trip_temp(struct thermal_zone_device *tzd, int trip,
  83                              int *temp)
  84 {
  85         int status;
  86         u32 out;
  87         struct intel_soc_dts_sensor_entry *dts;
  88         struct intel_soc_dts_sensors *sensors;
  89
  90         dts = tzd->devdata;
  91         sensors = dts->sensors;
  92         mutex_lock(&sensors->dts_update_lock);
  93         status = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
  94                                SOC_DTS_OFFSET_PTPS, &out);
  95         mutex_unlock(&sensors->dts_update_lock);
  96         if (status)
  97                 return status;
  98
  99         out = (out >> (trip * 8)) & SOC_DTS_TJMAX_ENCODING;
 100         if (!out)
 101                 *temp = 0;
 102         else
 103                 *temp = sensors->tj_max - out * 1000;
 104
 105         return 0;
 106 }
 107
 108 static int update_trip_temp(struct intel_soc_dts_sensor_entry *dts,
 109                             int thres_index, int temp,
 110                             enum thermal_trip_type trip_type)
 111 {
 112         int status;
 113         u32 temp_out;
 114         u32 out;
 115         u32 store_ptps;
 116         u32 store_ptmc;
 117         u32 store_te_out;
 118         u32 te_out;
 119         u32 int_enable_bit = SOC_DTS_TE_APICA_ENABLE;
 120         struct intel_soc_dts_sensors *sensors = dts->sensors;
 121
 122         if (sensors->intr_type == INTEL_SOC_DTS_INTERRUPT_MSI)
 123                 int_enable_bit |= SOC_DTS_TE_MSI_ENABLE;
 124
 125         temp_out = (sensors->tj_max - temp) / 1000;
 126
 127         status = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
 128                                SOC_DTS_OFFSET_PTPS, &store_ptps);
 129         if (status)
 130                 return status;
 131
 132         out = (store_ptps & ~(0xFF << (thres_index * 8)));
 133         out |= (temp_out & 0xFF) << (thres_index * 8);
 134         status = iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
 135                                 SOC_DTS_OFFSET_PTPS, out);
 136         if (status)
 137                 return status;
 138
 139         pr_debug("update_trip_temp PTPS = %x\n", out);
 140         status = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
 141                                SOC_DTS_OFFSET_PTMC, &out);
 142         if (status)
 143                 goto err_restore_ptps;
 144
 145         store_ptmc = out;
 146
 147         status = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
 148                                SOC_DTS_TE_AUX0 + thres_index,
 149                                &te_out);
 150         if (status)
 151                 goto err_restore_ptmc;
 152
 153         store_te_out = te_out;
 154         /* Enable for CPU module 0 and module 1 */
 155         out |= (SOC_DTS_CPU_MODULE0_ENABLE_BIT |
 156                                         SOC_DTS_CPU_MODULE1_ENABLE_BIT);
 157         if (temp) {
 158                 if (thres_index)
 159                         out |= SOC_DTS_AUX1_ENABLE_BIT;
 160                 else
 161                         out |= SOC_DTS_AUX0_ENABLE_BIT;
 162                 te_out |= int_enable_bit;
 163         } else {
 164                 if (thres_index)
 165                         out &= ~SOC_DTS_AUX1_ENABLE_BIT;
 166                 else
 167                         out &= ~SOC_DTS_AUX0_ENABLE_BIT;
 168                 te_out &= ~int_enable_bit;
 169         }
 170         status = iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
 171                                 SOC_DTS_OFFSET_PTMC, out);
 172         if (status)
 173                 goto err_restore_te_out;
 174
 175         status = iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
 176                                 SOC_DTS_TE_AUX0 + thres_index,
 177                                 te_out);
 178         if (status)
 179                 goto err_restore_te_out;
 180
 181         dts->trip_types[thres_index] = trip_type;
 182
 183         return 0;
 184 err_restore_te_out:
 185         iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
 186                        SOC_DTS_OFFSET_PTMC, store_te_out);
 187 err_restore_ptmc:
 188         iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
 189                        SOC_DTS_OFFSET_PTMC, store_ptmc);
 190 err_restore_ptps:
 191         iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
 192                        SOC_DTS_OFFSET_PTPS, store_ptps);
 193         /* Nothing we can do if restore fails */
 194
 195         return status;
 196 }
 197
 198 static int sys_set_trip_temp(struct thermal_zone_device *tzd, int trip,
 199                              int temp)
 200 {
 201         struct intel_soc_dts_sensor_entry *dts = tzd->devdata;
 202         struct intel_soc_dts_sensors *sensors = dts->sensors;
 203         int status;
 204
 205         if (temp > sensors->tj_max)
 206                 return -EINVAL;
 207
 208         mutex_lock(&sensors->dts_update_lock);
 209         status = update_trip_temp(tzd->devdata, trip, temp,
 210                                   dts->trip_types[trip]);
 211         mutex_unlock(&sensors->dts_update_lock);
 212
 213         return status;
 214 }
 215
 216 static int sys_get_trip_type(struct thermal_zone_device *tzd,
 217                              int trip, enum thermal_trip_type *type)
 218 {
 219         struct intel_soc_dts_sensor_entry *dts;
 220
 221         dts = tzd->devdata;
 222
 223         *type = dts->trip_types[trip];
 224
 225         return 0;
 226 }
 227
 228 static int sys_get_curr_temp(struct thermal_zone_device *tzd,
 229                              int *temp)
 230 {
 231         int status;
 232         u32 out;
 233         struct intel_soc_dts_sensor_entry *dts;
 234         struct intel_soc_dts_sensors *sensors;
 235
 236         dts = tzd->devdata;
 237         sensors = dts->sensors;
 238         status = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
 239                                SOC_DTS_OFFSET_TEMP, &out);
 240         if (status)
 241                 return status;
 242
 243         out = (out & dts->temp_mask) >> dts->temp_shift;
 244         out -= SOC_DTS_TJMAX_ENCODING;
 245         *temp = sensors->tj_max - out * 1000;
 246
 247         return 0;
 248 }
 249
 250 static struct thermal_zone_device_ops tzone_ops = {
 251         .get_temp = sys_get_curr_temp,
 252         .get_trip_temp = sys_get_trip_temp,
 253         .get_trip_type = sys_get_trip_type,
 254         .set_trip_temp = sys_set_trip_temp,
 255 };
 256
 257 static int soc_dts_enable(int id)
 258 {
 259         u32 out;
 260         int ret;
 261
 262         ret = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
 263                             SOC_DTS_OFFSET_ENABLE, &out);
 264         if (ret)
 265                 return ret;
 266
 267         if (!(out & BIT(id))) {
 268                 out |= BIT(id);
 269                 ret = iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
 270                                      SOC_DTS_OFFSET_ENABLE, out);
 271                 if (ret)
 272                         return ret;
 273         }
 274
 275         return ret;
 276 }
 277
 278 static void remove_dts_thermal_zone(struct intel_soc_dts_sensor_entry *dts)
 279 {
 280         if (dts) {
 281                 iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
 282                                SOC_DTS_OFFSET_ENABLE, dts->store_status);
 283                 thermal_zone_device_unregister(dts->tzone);
 284         }
 285 }
 286
 287 static int add_dts_thermal_zone(int id, struct intel_soc_dts_sensor_entry *dts,
 288                                 bool notification_support, int trip_cnt,
 289                                 int read_only_trip_cnt)
 290 {
 291         char name[10];
 292         int trip_count = 0;
 293         int trip_mask = 0;
 294         u32 store_ptps;
 295         int ret;
 296         int i;
 297
 298         /* Store status to restor on exit */
 299         ret = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
 300                             SOC_DTS_OFFSET_ENABLE,
 301                             &dts->store_status);
 302         if (ret)
 303                 goto err_ret;
 304
 305         dts->id = id;
 306         dts->temp_mask = 0x00FF << (id * 8);
 307         dts->temp_shift = id * 8;
 308         if (notification_support) {
 309                 trip_count = min(SOC_MAX_DTS_TRIPS, trip_cnt);
 310                 trip_mask = BIT(trip_count - read_only_trip_cnt) - 1;
 311         }
 312
 313         /* Check if the writable trip we provide is not used by BIOS */
 314         ret = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
 315                             SOC_DTS_OFFSET_PTPS, &store_ptps);
 316         if (ret)
 317                 trip_mask = 0;
 318         else {
 319                 for (i = 0; i < trip_count; ++i) {
 320                         if (trip_mask & BIT(i))
 321                                 if (store_ptps & (0xff << (i * 8)))
 322                                         trip_mask &= ~BIT(i);
 323                 }
 324         }
 325         dts->trip_mask = trip_mask;
 326         dts->trip_count = trip_count;
 327         snprintf(name, sizeof(name), "soc_dts%d", id);
 328         dts->tzone = thermal_zone_device_register(name,
 329                                                   trip_count,
 330                                                   trip_mask,
 331                                                   dts, &tzone_ops,
 332                                                   NULL, 0, 0);
 333         if (IS_ERR(dts->tzone)) {
 334                 ret = PTR_ERR(dts->tzone);
 335                 goto err_ret;
 336         }
 337
 338         ret = soc_dts_enable(id);
 339         if (ret)
 340                 goto err_enable;
 341
 342         return 0;
 343 err_enable:
 344         thermal_zone_device_unregister(dts->tzone);
 345 err_ret:
 346         return ret;
 347 }
 348
 349 int intel_soc_dts_iosf_add_read_only_critical_trip(
 350         struct intel_soc_dts_sensors *sensors, int critical_offset)
 351 {
 352         int i, j;
 353
 354         for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
 355                 for (j = 0; j < sensors->soc_dts[i].trip_count; ++j) {
 356                         if (!(sensors->soc_dts[i].trip_mask & BIT(j))) {
 357                                 return update_trip_temp(&sensors->soc_dts[i], j,
 358                                         sensors->tj_max - critical_offset,
 359                                         THERMAL_TRIP_CRITICAL);
 360                         }
 361                 }
 362         }
 363
 364         return -EINVAL;
 365 }
 366 EXPORT_SYMBOL_GPL(intel_soc_dts_iosf_add_read_only_critical_trip);
 367
 368 void intel_soc_dts_iosf_interrupt_handler(struct intel_soc_dts_sensors *sensors)
 369 {
 370         u32 sticky_out;
 371         int status;
 372         u32 ptmc_out;
 373         unsigned long flags;
 374
 375         spin_lock_irqsave(&sensors->intr_notify_lock, flags);
 376
 377         status = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
 378                                SOC_DTS_OFFSET_PTMC, &ptmc_out);
 379         ptmc_out |= SOC_DTS_PTMC_APIC_DEASSERT_BIT;
 380         status = iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
 381                                 SOC_DTS_OFFSET_PTMC, ptmc_out);
 382
 383         status = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
 384                                SOC_DTS_OFFSET_PTTSS, &sticky_out);
 385         pr_debug("status %d PTTSS %x\n", status, sticky_out);
 386         if (sticky_out & SOC_DTS_TRIP_MASK) {
 387                 int i;
 388                 /* reset sticky bit */
 389                 status = iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
 390                                         SOC_DTS_OFFSET_PTTSS, sticky_out);
 391                 spin_unlock_irqrestore(&sensors->intr_notify_lock, flags);
 392
 393                 for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
 394                         pr_debug("TZD update for zone %d\n", i);
 395                         thermal_zone_device_update(sensors->soc_dts[i].tzone);
 396                 }
 397         } else
 398                 spin_unlock_irqrestore(&sensors->intr_notify_lock, flags);
 399 }
 400 EXPORT_SYMBOL_GPL(intel_soc_dts_iosf_interrupt_handler);
 401
 402 struct intel_soc_dts_sensors *intel_soc_dts_iosf_init(
 403         enum intel_soc_dts_interrupt_type intr_type, int trip_count,
 404         int read_only_trip_count)
 405 {
 406         struct intel_soc_dts_sensors *sensors;
 407         bool notification;
 408         u32 tj_max;
 409         int ret;
 410         int i;
 411
 412         if (!iosf_mbi_available())
 413                 return ERR_PTR(-ENODEV);
 414
 415         if (!trip_count || read_only_trip_count > trip_count)
 416                 return ERR_PTR(-EINVAL);
 417
 418         if (get_tj_max(&tj_max))
 419                 return ERR_PTR(-EINVAL);
 420
 421         sensors = kzalloc(sizeof(*sensors), GFP_KERNEL);
 422         if (!sensors)
 423                 return ERR_PTR(-ENOMEM);
 424
 425         spin_lock_init(&sensors->intr_notify_lock);
 426         mutex_init(&sensors->dts_update_lock);
 427         sensors->intr_type = intr_type;
 428         sensors->tj_max = tj_max;
 429         if (intr_type == INTEL_SOC_DTS_INTERRUPT_NONE)
 430                 notification = false;
 431         else
 432                 notification = true;
 433         for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
 434                 sensors->soc_dts[i].sensors = sensors;
 435                 ret = add_dts_thermal_zone(i, &sensors->soc_dts[i],
 436                                            notification, trip_count,
 437                                            read_only_trip_count);
 438                 if (ret)
 439                         goto err_free;
 440         }
 441
 442         for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
 443                 ret = update_trip_temp(&sensors->soc_dts[i], 0, 0,
 444                                        THERMAL_TRIP_PASSIVE);
 445                 if (ret)
 446                         goto err_remove_zone;
 447
 448                 ret = update_trip_temp(&sensors->soc_dts[i], 1, 0,
 449                                        THERMAL_TRIP_PASSIVE);
 450                 if (ret)
 451                         goto err_remove_zone;
 452         }
 453
 454         return sensors;
 455 err_remove_zone:
 456         for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i)
 457                 remove_dts_thermal_zone(&sensors->soc_dts[i]);
 458
 459 err_free:
 460         kfree(sensors);
 461         return ERR_PTR(ret);
 462 }
 463 EXPORT_SYMBOL_GPL(intel_soc_dts_iosf_init);
 464
 465 void intel_soc_dts_iosf_exit(struct intel_soc_dts_sensors *sensors)
 466 {
 467         int i;
 468
 469         for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
 470                 update_trip_temp(&sensors->soc_dts[i], 0, 0, 0);
 471                 update_trip_temp(&sensors->soc_dts[i], 1, 0, 0);
 472                 remove_dts_thermal_zone(&sensors->soc_dts[i]);
 473         }
 474         kfree(sensors);
 475 }
 476 EXPORT_SYMBOL_GPL(intel_soc_dts_iosf_exit);
 477
 478 MODULE_LICENSE("GPL v2");