drivers/thermal/int340x_thermal/processor_thermal_device.c

   1 /*
   2  * processor_thermal_device.c
   3  * Copyright (c) 2014, 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 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/pci.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/acpi.h>
  22 #include <linux/thermal.h>
  23 #include "int340x_thermal_zone.h"
  24 #include "../intel_soc_dts_iosf.h"
  25
  26 /* Broadwell-U/HSB thermal reporting device */
  27 #define PCI_DEVICE_ID_PROC_BDW_THERMAL  0x1603
  28 #define PCI_DEVICE_ID_PROC_HSB_THERMAL  0x0A03
  29
  30 /* Skylake thermal reporting device */
  31 #define PCI_DEVICE_ID_PROC_SKL_THERMAL  0x1903
  32
  33 /* Braswell thermal reporting device */
  34 #define PCI_DEVICE_ID_PROC_BSW_THERMAL  0x22DC
  35
  36 /* Broxton thermal reporting device */
  37 #define PCI_DEVICE_ID_PROC_BXT0_THERMAL  0x0A8C
  38 #define PCI_DEVICE_ID_PROC_BXT1_THERMAL  0x1A8C
  39 #define PCI_DEVICE_ID_PROC_BXTX_THERMAL  0x4A8C
  40 #define PCI_DEVICE_ID_PROC_BXTP_THERMAL  0x5A8C
  41
  42 struct power_config {
  43         u32     index;
  44         u32     min_uw;
  45         u32     max_uw;
  46         u32     tmin_us;
  47         u32     tmax_us;
  48         u32     step_uw;
  49 };
  50
  51 struct proc_thermal_device {
  52         struct device *dev;
  53         struct acpi_device *adev;
  54         struct power_config power_limits[2];
  55         struct int34x_thermal_zone *int340x_zone;
  56         struct intel_soc_dts_sensors *soc_dts;
  57 };
  58
  59 enum proc_thermal_emum_mode_type {
  60         PROC_THERMAL_NONE,
  61         PROC_THERMAL_PCI,
  62         PROC_THERMAL_PLATFORM_DEV
  63 };
  64
  65 /*
  66  * We can have only one type of enumeration, PCI or Platform,
  67  * not both. So we don't need instance specific data.
  68  */
  69 static enum proc_thermal_emum_mode_type proc_thermal_emum_mode =
  70                                                         PROC_THERMAL_NONE;
  71
  72 #define POWER_LIMIT_SHOW(index, suffix) \
  73 static ssize_t power_limit_##index##_##suffix##_show(struct device *dev, \
  74                                         struct device_attribute *attr, \
  75                                         char *buf) \
  76 { \
  77         struct pci_dev *pci_dev; \
  78         struct platform_device *pdev; \
  79         struct proc_thermal_device *proc_dev; \
  80 \
  81         if (proc_thermal_emum_mode == PROC_THERMAL_PLATFORM_DEV) { \
  82                 pdev = to_platform_device(dev); \
  83                 proc_dev = platform_get_drvdata(pdev); \
  84         } else { \
  85                 pci_dev = to_pci_dev(dev); \
  86                 proc_dev = pci_get_drvdata(pci_dev); \
  87         } \
  88         return sprintf(buf, "%lu\n",\
  89         (unsigned long)proc_dev->power_limits[index].suffix * 1000); \
  90 }
  91
  92 POWER_LIMIT_SHOW(0, min_uw)
  93 POWER_LIMIT_SHOW(0, max_uw)
  94 POWER_LIMIT_SHOW(0, step_uw)
  95 POWER_LIMIT_SHOW(0, tmin_us)
  96 POWER_LIMIT_SHOW(0, tmax_us)
  97
  98 POWER_LIMIT_SHOW(1, min_uw)
  99 POWER_LIMIT_SHOW(1, max_uw)
 100 POWER_LIMIT_SHOW(1, step_uw)
 101 POWER_LIMIT_SHOW(1, tmin_us)
 102 POWER_LIMIT_SHOW(1, tmax_us)
 103
 104 static DEVICE_ATTR_RO(power_limit_0_min_uw);
 105 static DEVICE_ATTR_RO(power_limit_0_max_uw);
 106 static DEVICE_ATTR_RO(power_limit_0_step_uw);
 107 static DEVICE_ATTR_RO(power_limit_0_tmin_us);
 108 static DEVICE_ATTR_RO(power_limit_0_tmax_us);
 109
 110 static DEVICE_ATTR_RO(power_limit_1_min_uw);
 111 static DEVICE_ATTR_RO(power_limit_1_max_uw);
 112 static DEVICE_ATTR_RO(power_limit_1_step_uw);
 113 static DEVICE_ATTR_RO(power_limit_1_tmin_us);
 114 static DEVICE_ATTR_RO(power_limit_1_tmax_us);
 115
 116 static struct attribute *power_limit_attrs[] = {
 117         &dev_attr_power_limit_0_min_uw.attr,
 118         &dev_attr_power_limit_1_min_uw.attr,
 119         &dev_attr_power_limit_0_max_uw.attr,
 120         &dev_attr_power_limit_1_max_uw.attr,
 121         &dev_attr_power_limit_0_step_uw.attr,
 122         &dev_attr_power_limit_1_step_uw.attr,
 123         &dev_attr_power_limit_0_tmin_us.attr,
 124         &dev_attr_power_limit_1_tmin_us.attr,
 125         &dev_attr_power_limit_0_tmax_us.attr,
 126         &dev_attr_power_limit_1_tmax_us.attr,
 127         NULL
 128 };
 129
 130 static struct attribute_group power_limit_attribute_group = {
 131         .attrs = power_limit_attrs,
 132         .name = "power_limits"
 133 };
 134
 135 static int stored_tjmax; /* since it is fixed, we can have local storage */
 136
 137 static int get_tjmax(void)
 138 {
 139         u32 eax, edx;
 140         u32 val;
 141         int err;
 142
 143         err = rdmsr_safe(MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
 144         if (err)
 145                 return err;
 146
 147         val = (eax >> 16) & 0xff;
 148         if (val)
 149                 return val;
 150
 151         return -EINVAL;
 152 }
 153
 154 static int read_temp_msr(int *temp)
 155 {
 156         int cpu;
 157         u32 eax, edx;
 158         int err;
 159         unsigned long curr_temp_off = 0;
 160
 161         *temp = 0;
 162
 163         for_each_online_cpu(cpu) {
 164                 err = rdmsr_safe_on_cpu(cpu, MSR_IA32_THERM_STATUS, &eax,
 165                                         &edx);
 166                 if (err)
 167                         goto err_ret;
 168                 else {
 169                         if (eax & 0x80000000) {
 170                                 curr_temp_off = (eax >> 16) & 0x7f;
 171                                 if (!*temp || curr_temp_off < *temp)
 172                                         *temp = curr_temp_off;
 173                         } else {
 174                                 err = -EINVAL;
 175                                 goto err_ret;
 176                         }
 177                 }
 178         }
 179
 180         return 0;
 181 err_ret:
 182         return err;
 183 }
 184
 185 static int proc_thermal_get_zone_temp(struct thermal_zone_device *zone,
 186                                          int *temp)
 187 {
 188         int ret;
 189
 190         ret = read_temp_msr(temp);
 191         if (!ret)
 192                 *temp = (stored_tjmax - *temp) * 1000;
 193
 194         return ret;
 195 }
 196
 197 static struct thermal_zone_device_ops proc_thermal_local_ops = {
 198         .get_temp       = proc_thermal_get_zone_temp,
 199 };
 200
 201 static int proc_thermal_read_ppcc(struct proc_thermal_device *proc_priv)
 202 {
 203         int i;
 204         acpi_status status;
 205         struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
 206         union acpi_object *elements, *ppcc;
 207         union acpi_object *p;
 208         int ret = 0;
 209
 210         status = acpi_evaluate_object(proc_priv->adev->handle, "PPCC",
 211                                       NULL, &buf);
 212         if (ACPI_FAILURE(status))
 213                 return -ENODEV;
 214
 215         p = buf.pointer;
 216         if (!p || (p->type != ACPI_TYPE_PACKAGE)) {
 217                 dev_err(proc_priv->dev, "Invalid PPCC data\n");
 218                 ret = -EFAULT;
 219                 goto free_buffer;
 220         }
 221
 222         if (!p->package.count) {
 223                 dev_err(proc_priv->dev, "Invalid PPCC package size\n");
 224                 ret = -EFAULT;
 225                 goto free_buffer;
 226         }
 227
 228         for (i = 0; i < min((int)p->package.count - 1, 2); ++i) {
 229                 elements = &(p->package.elements[i+1]);
 230                 if (elements->type != ACPI_TYPE_PACKAGE ||
 231                     elements->package.count != 6) {
 232                         ret = -EFAULT;
 233                         goto free_buffer;
 234                 }
 235                 ppcc = elements->package.elements;
 236                 proc_priv->power_limits[i].index = ppcc[0].integer.value;
 237                 proc_priv->power_limits[i].min_uw = ppcc[1].integer.value;
 238                 proc_priv->power_limits[i].max_uw = ppcc[2].integer.value;
 239                 proc_priv->power_limits[i].tmin_us = ppcc[3].integer.value;
 240                 proc_priv->power_limits[i].tmax_us = ppcc[4].integer.value;
 241                 proc_priv->power_limits[i].step_uw = ppcc[5].integer.value;
 242         }
 243
 244 free_buffer:
 245         kfree(buf.pointer);
 246
 247         return ret;
 248 }
 249
 250 #define PROC_POWER_CAPABILITY_CHANGED   0x83
 251 static void proc_thermal_notify(acpi_handle handle, u32 event, void *data)
 252 {
 253         struct proc_thermal_device *proc_priv = data;
 254
 255         if (!proc_priv)
 256                 return;
 257
 258         switch (event) {
 259         case PROC_POWER_CAPABILITY_CHANGED:
 260                 proc_thermal_read_ppcc(proc_priv);
 261                 int340x_thermal_zone_device_update(proc_priv->int340x_zone,
 262                                 THERMAL_DEVICE_POWER_CAPABILITY_CHANGED);
 263                 break;
 264         default:
 265                 dev_err(proc_priv->dev, "Unsupported event [0x%x]\n", event);
 266                 break;
 267         }
 268 }
 269
 270
 271 static int proc_thermal_add(struct device *dev,
 272                             struct proc_thermal_device **priv)
 273 {
 274         struct proc_thermal_device *proc_priv;
 275         struct acpi_device *adev;
 276         acpi_status status;
 277         unsigned long long tmp;
 278         struct thermal_zone_device_ops *ops = NULL;
 279         int ret;
 280
 281         adev = ACPI_COMPANION(dev);
 282         if (!adev)
 283                 return -ENODEV;
 284
 285         proc_priv = devm_kzalloc(dev, sizeof(*proc_priv), GFP_KERNEL);
 286         if (!proc_priv)
 287                 return -ENOMEM;
 288
 289         proc_priv->dev = dev;
 290         proc_priv->adev = adev;
 291         *priv = proc_priv;
 292
 293         ret = proc_thermal_read_ppcc(proc_priv);
 294         if (!ret) {
 295                 ret = sysfs_create_group(&dev->kobj,
 296                                          &power_limit_attribute_group);
 297
 298         }
 299         if (ret)
 300                 return ret;
 301
 302         status = acpi_evaluate_integer(adev->handle, "_TMP", NULL, &tmp);
 303         if (ACPI_FAILURE(status)) {
 304                 /* there is no _TMP method, add local method */
 305                 stored_tjmax = get_tjmax();
 306                 if (stored_tjmax > 0)
 307                         ops = &proc_thermal_local_ops;
 308         }
 309
 310         proc_priv->int340x_zone = int340x_thermal_zone_add(adev, ops);
 311         if (IS_ERR(proc_priv->int340x_zone)) {
 312                 ret = PTR_ERR(proc_priv->int340x_zone);
 313                 goto remove_group;
 314         } else
 315                 ret = 0;
 316
 317         ret = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
 318                                           proc_thermal_notify,
 319                                           (void *)proc_priv);
 320         if (ret)
 321                 goto remove_zone;
 322
 323         return 0;
 324
 325 remove_zone:
 326         int340x_thermal_zone_remove(proc_priv->int340x_zone);
 327 remove_group:
 328         sysfs_remove_group(&proc_priv->dev->kobj,
 329                            &power_limit_attribute_group);
 330
 331         return ret;
 332 }
 333
 334 static void proc_thermal_remove(struct proc_thermal_device *proc_priv)
 335 {
 336         acpi_remove_notify_handler(proc_priv->adev->handle,
 337                                    ACPI_DEVICE_NOTIFY, proc_thermal_notify);
 338         int340x_thermal_zone_remove(proc_priv->int340x_zone);
 339         sysfs_remove_group(&proc_priv->dev->kobj,
 340                            &power_limit_attribute_group);
 341 }
 342
 343 static int int3401_add(struct platform_device *pdev)
 344 {
 345         struct proc_thermal_device *proc_priv;
 346         int ret;
 347
 348         if (proc_thermal_emum_mode == PROC_THERMAL_PCI) {
 349                 dev_err(&pdev->dev, "error: enumerated as PCI dev\n");
 350                 return -ENODEV;
 351         }
 352
 353         ret = proc_thermal_add(&pdev->dev, &proc_priv);
 354         if (ret)
 355                 return ret;
 356
 357         platform_set_drvdata(pdev, proc_priv);
 358         proc_thermal_emum_mode = PROC_THERMAL_PLATFORM_DEV;
 359
 360         return 0;
 361 }
 362
 363 static int int3401_remove(struct platform_device *pdev)
 364 {
 365         proc_thermal_remove(platform_get_drvdata(pdev));
 366
 367         return 0;
 368 }
 369
 370 static irqreturn_t proc_thermal_pci_msi_irq(int irq, void *devid)
 371 {
 372         struct proc_thermal_device *proc_priv;
 373         struct pci_dev *pdev = devid;
 374
 375         proc_priv = pci_get_drvdata(pdev);
 376
 377         intel_soc_dts_iosf_interrupt_handler(proc_priv->soc_dts);
 378
 379         return IRQ_HANDLED;
 380 }
 381
 382 static int  proc_thermal_pci_probe(struct pci_dev *pdev,
 383                                    const struct pci_device_id *unused)
 384 {
 385         struct proc_thermal_device *proc_priv;
 386         int ret;
 387
 388         if (proc_thermal_emum_mode == PROC_THERMAL_PLATFORM_DEV) {
 389                 dev_err(&pdev->dev, "error: enumerated as platform dev\n");
 390                 return -ENODEV;
 391         }
 392
 393         ret = pci_enable_device(pdev);
 394         if (ret < 0) {
 395                 dev_err(&pdev->dev, "error: could not enable device\n");
 396                 return ret;
 397         }
 398
 399         ret = proc_thermal_add(&pdev->dev, &proc_priv);
 400         if (ret) {
 401                 pci_disable_device(pdev);
 402                 return ret;
 403         }
 404
 405         pci_set_drvdata(pdev, proc_priv);
 406         proc_thermal_emum_mode = PROC_THERMAL_PCI;
 407
 408         if (pdev->device == PCI_DEVICE_ID_PROC_BSW_THERMAL) {
 409                 /*
 410                  * Enumerate additional DTS sensors available via IOSF.
 411                  * But we are not treating as a failure condition, if
 412                  * there are no aux DTSs enabled or fails. This driver
 413                  * already exposes sensors, which can be accessed via
 414                  * ACPI/MSR. So we don't want to fail for auxiliary DTSs.
 415                  */
 416                 proc_priv->soc_dts = intel_soc_dts_iosf_init(
 417                                         INTEL_SOC_DTS_INTERRUPT_MSI, 2, 0);
 418
 419                 if (proc_priv->soc_dts && pdev->irq) {
 420                         ret = pci_enable_msi(pdev);
 421                         if (!ret) {
 422                                 ret = request_threaded_irq(pdev->irq, NULL,
 423                                                 proc_thermal_pci_msi_irq,
 424                                                 IRQF_ONESHOT, "proc_thermal",
 425                                                 pdev);
 426                                 if (ret) {
 427                                         intel_soc_dts_iosf_exit(
 428                                                         proc_priv->soc_dts);
 429                                         pci_disable_msi(pdev);
 430                                         proc_priv->soc_dts = NULL;
 431                                 }
 432                         }
 433                 } else
 434                         dev_err(&pdev->dev, "No auxiliary DTSs enabled\n");
 435         }
 436
 437         return 0;
 438 }
 439
 440 static void  proc_thermal_pci_remove(struct pci_dev *pdev)
 441 {
 442         struct proc_thermal_device *proc_priv = pci_get_drvdata(pdev);
 443
 444         if (proc_priv->soc_dts) {
 445                 intel_soc_dts_iosf_exit(proc_priv->soc_dts);
 446                 if (pdev->irq) {
 447                         free_irq(pdev->irq, pdev);
 448                         pci_disable_msi(pdev);
 449                 }
 450         }
 451         proc_thermal_remove(proc_priv);
 452         pci_disable_device(pdev);
 453 }
 454
 455 static const struct pci_device_id proc_thermal_pci_ids[] = {
 456         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BDW_THERMAL)},
 457         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_HSB_THERMAL)},
 458         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_SKL_THERMAL)},
 459         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BSW_THERMAL)},
 460         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BXT0_THERMAL)},
 461         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BXT1_THERMAL)},
 462         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BXTX_THERMAL)},
 463         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BXTP_THERMAL)},
 464         { 0, },
 465 };
 466
 467 MODULE_DEVICE_TABLE(pci, proc_thermal_pci_ids);
 468
 469 static struct pci_driver proc_thermal_pci_driver = {
 470         .name           = "proc_thermal",
 471         .probe          = proc_thermal_pci_probe,
 472         .remove         = proc_thermal_pci_remove,
 473         .id_table       = proc_thermal_pci_ids,
 474 };
 475
 476 static const struct acpi_device_id int3401_device_ids[] = {
 477         {"INT3401", 0},
 478         {"", 0},
 479 };
 480 MODULE_DEVICE_TABLE(acpi, int3401_device_ids);
 481
 482 static struct platform_driver int3401_driver = {
 483         .probe = int3401_add,
 484         .remove = int3401_remove,
 485         .driver = {
 486                 .name = "int3401 thermal",
 487                 .acpi_match_table = int3401_device_ids,
 488         },
 489 };
 490
 491 static int __init proc_thermal_init(void)
 492 {
 493         int ret;
 494
 495         ret = platform_driver_register(&int3401_driver);
 496         if (ret)
 497                 return ret;
 498
 499         ret = pci_register_driver(&proc_thermal_pci_driver);
 500
 501         return ret;
 502 }
 503
 504 static void __exit proc_thermal_exit(void)
 505 {
 506         platform_driver_unregister(&int3401_driver);
 507         pci_unregister_driver(&proc_thermal_pci_driver);
 508 }
 509
 510 module_init(proc_thermal_init);
 511 module_exit(proc_thermal_exit);
 512
 513 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
 514 MODULE_DESCRIPTION("Processor Thermal Reporting Device Driver");
 515 MODULE_LICENSE("GPL v2");