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_add(struct device *dev,
 202                             struct proc_thermal_device **priv)
 203 {
 204         struct proc_thermal_device *proc_priv;
 205         struct acpi_device *adev;
 206         acpi_status status;
 207         struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
 208         union acpi_object *elements, *ppcc;
 209         union acpi_object *p;
 210         unsigned long long tmp;
 211         struct thermal_zone_device_ops *ops = NULL;
 212         int i;
 213         int ret;
 214
 215         adev = ACPI_COMPANION(dev);
 216         if (!adev)
 217                 return -ENODEV;
 218
 219         status = acpi_evaluate_object(adev->handle, "PPCC", NULL, &buf);
 220         if (ACPI_FAILURE(status))
 221                 return -ENODEV;
 222
 223         p = buf.pointer;
 224         if (!p || (p->type != ACPI_TYPE_PACKAGE)) {
 225                 dev_err(dev, "Invalid PPCC data\n");
 226                 ret = -EFAULT;
 227                 goto free_buffer;
 228         }
 229         if (!p->package.count) {
 230                 dev_err(dev, "Invalid PPCC package size\n");
 231                 ret = -EFAULT;
 232                 goto free_buffer;
 233         }
 234
 235         proc_priv = devm_kzalloc(dev, sizeof(*proc_priv), GFP_KERNEL);
 236         if (!proc_priv) {
 237                 ret = -ENOMEM;
 238                 goto free_buffer;
 239         }
 240
 241         proc_priv->dev = dev;
 242         proc_priv->adev = adev;
 243
 244         for (i = 0; i < min((int)p->package.count - 1, 2); ++i) {
 245                 elements = &(p->package.elements[i+1]);
 246                 if (elements->type != ACPI_TYPE_PACKAGE ||
 247                     elements->package.count != 6) {
 248                         ret = -EFAULT;
 249                         goto free_buffer;
 250                 }
 251                 ppcc = elements->package.elements;
 252                 proc_priv->power_limits[i].index = ppcc[0].integer.value;
 253                 proc_priv->power_limits[i].min_uw = ppcc[1].integer.value;
 254                 proc_priv->power_limits[i].max_uw = ppcc[2].integer.value;
 255                 proc_priv->power_limits[i].tmin_us = ppcc[3].integer.value;
 256                 proc_priv->power_limits[i].tmax_us = ppcc[4].integer.value;
 257                 proc_priv->power_limits[i].step_uw = ppcc[5].integer.value;
 258         }
 259
 260         *priv = proc_priv;
 261
 262         ret = sysfs_create_group(&dev->kobj,
 263                                  &power_limit_attribute_group);
 264         if (ret)
 265                 goto free_buffer;
 266
 267         status = acpi_evaluate_integer(adev->handle, "_TMP", NULL, &tmp);
 268         if (ACPI_FAILURE(status)) {
 269                 /* there is no _TMP method, add local method */
 270                 stored_tjmax = get_tjmax();
 271                 if (stored_tjmax > 0)
 272                         ops = &proc_thermal_local_ops;
 273         }
 274
 275         proc_priv->int340x_zone = int340x_thermal_zone_add(adev, ops);
 276         if (IS_ERR(proc_priv->int340x_zone)) {
 277                 sysfs_remove_group(&proc_priv->dev->kobj,
 278                            &power_limit_attribute_group);
 279                 ret = PTR_ERR(proc_priv->int340x_zone);
 280         } else
 281                 ret = 0;
 282
 283 free_buffer:
 284         kfree(buf.pointer);
 285
 286         return ret;
 287 }
 288
 289 static void proc_thermal_remove(struct proc_thermal_device *proc_priv)
 290 {
 291         int340x_thermal_zone_remove(proc_priv->int340x_zone);
 292         sysfs_remove_group(&proc_priv->dev->kobj,
 293                            &power_limit_attribute_group);
 294 }
 295
 296 static int int3401_add(struct platform_device *pdev)
 297 {
 298         struct proc_thermal_device *proc_priv;
 299         int ret;
 300
 301         if (proc_thermal_emum_mode == PROC_THERMAL_PCI) {
 302                 dev_err(&pdev->dev, "error: enumerated as PCI dev\n");
 303                 return -ENODEV;
 304         }
 305
 306         ret = proc_thermal_add(&pdev->dev, &proc_priv);
 307         if (ret)
 308                 return ret;
 309
 310         platform_set_drvdata(pdev, proc_priv);
 311         proc_thermal_emum_mode = PROC_THERMAL_PLATFORM_DEV;
 312
 313         return 0;
 314 }
 315
 316 static int int3401_remove(struct platform_device *pdev)
 317 {
 318         proc_thermal_remove(platform_get_drvdata(pdev));
 319
 320         return 0;
 321 }
 322
 323 static irqreturn_t proc_thermal_pci_msi_irq(int irq, void *devid)
 324 {
 325         struct proc_thermal_device *proc_priv;
 326         struct pci_dev *pdev = devid;
 327
 328         proc_priv = pci_get_drvdata(pdev);
 329
 330         intel_soc_dts_iosf_interrupt_handler(proc_priv->soc_dts);
 331
 332         return IRQ_HANDLED;
 333 }
 334
 335 static int  proc_thermal_pci_probe(struct pci_dev *pdev,
 336                                    const struct pci_device_id *unused)
 337 {
 338         struct proc_thermal_device *proc_priv;
 339         int ret;
 340
 341         if (proc_thermal_emum_mode == PROC_THERMAL_PLATFORM_DEV) {
 342                 dev_err(&pdev->dev, "error: enumerated as platform dev\n");
 343                 return -ENODEV;
 344         }
 345
 346         ret = pci_enable_device(pdev);
 347         if (ret < 0) {
 348                 dev_err(&pdev->dev, "error: could not enable device\n");
 349                 return ret;
 350         }
 351
 352         ret = proc_thermal_add(&pdev->dev, &proc_priv);
 353         if (ret) {
 354                 pci_disable_device(pdev);
 355                 return ret;
 356         }
 357
 358         pci_set_drvdata(pdev, proc_priv);
 359         proc_thermal_emum_mode = PROC_THERMAL_PCI;
 360
 361         if (pdev->device == PCI_DEVICE_ID_PROC_BSW_THERMAL) {
 362                 /*
 363                  * Enumerate additional DTS sensors available via IOSF.
 364                  * But we are not treating as a failure condition, if
 365                  * there are no aux DTSs enabled or fails. This driver
 366                  * already exposes sensors, which can be accessed via
 367                  * ACPI/MSR. So we don't want to fail for auxiliary DTSs.
 368                  */
 369                 proc_priv->soc_dts = intel_soc_dts_iosf_init(
 370                                         INTEL_SOC_DTS_INTERRUPT_MSI, 2, 0);
 371
 372                 if (proc_priv->soc_dts && pdev->irq) {
 373                         ret = pci_enable_msi(pdev);
 374                         if (!ret) {
 375                                 ret = request_threaded_irq(pdev->irq, NULL,
 376                                                 proc_thermal_pci_msi_irq,
 377                                                 IRQF_ONESHOT, "proc_thermal",
 378                                                 pdev);
 379                                 if (ret) {
 380                                         intel_soc_dts_iosf_exit(
 381                                                         proc_priv->soc_dts);
 382                                         pci_disable_msi(pdev);
 383                                         proc_priv->soc_dts = NULL;
 384                                 }
 385                         }
 386                 } else
 387                         dev_err(&pdev->dev, "No auxiliary DTSs enabled\n");
 388         }
 389
 390         return 0;
 391 }
 392
 393 static void  proc_thermal_pci_remove(struct pci_dev *pdev)
 394 {
 395         struct proc_thermal_device *proc_priv = pci_get_drvdata(pdev);
 396
 397         if (proc_priv->soc_dts) {
 398                 intel_soc_dts_iosf_exit(proc_priv->soc_dts);
 399                 if (pdev->irq) {
 400                         free_irq(pdev->irq, pdev);
 401                         pci_disable_msi(pdev);
 402                 }
 403         }
 404         proc_thermal_remove(proc_priv);
 405         pci_disable_device(pdev);
 406 }
 407
 408 static const struct pci_device_id proc_thermal_pci_ids[] = {
 409         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BDW_THERMAL)},
 410         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_HSB_THERMAL)},
 411         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_SKL_THERMAL)},
 412         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BSW_THERMAL)},
 413         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BXT0_THERMAL)},
 414         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BXT1_THERMAL)},
 415         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BXTX_THERMAL)},
 416         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BXTP_THERMAL)},
 417         { 0, },
 418 };
 419
 420 MODULE_DEVICE_TABLE(pci, proc_thermal_pci_ids);
 421
 422 static struct pci_driver proc_thermal_pci_driver = {
 423         .name           = "proc_thermal",
 424         .probe          = proc_thermal_pci_probe,
 425         .remove         = proc_thermal_pci_remove,
 426         .id_table       = proc_thermal_pci_ids,
 427 };
 428
 429 static const struct acpi_device_id int3401_device_ids[] = {
 430         {"INT3401", 0},
 431         {"", 0},
 432 };
 433 MODULE_DEVICE_TABLE(acpi, int3401_device_ids);
 434
 435 static struct platform_driver int3401_driver = {
 436         .probe = int3401_add,
 437         .remove = int3401_remove,
 438         .driver = {
 439                 .name = "int3401 thermal",
 440                 .acpi_match_table = int3401_device_ids,
 441         },
 442 };
 443
 444 static int __init proc_thermal_init(void)
 445 {
 446         int ret;
 447
 448         ret = platform_driver_register(&int3401_driver);
 449         if (ret)
 450                 return ret;
 451
 452         ret = pci_register_driver(&proc_thermal_pci_driver);
 453
 454         return ret;
 455 }
 456
 457 static void __exit proc_thermal_exit(void)
 458 {
 459         platform_driver_unregister(&int3401_driver);
 460         pci_unregister_driver(&proc_thermal_pci_driver);
 461 }
 462
 463 module_init(proc_thermal_init);
 464 module_exit(proc_thermal_exit);
 465
 466 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
 467 MODULE_DESCRIPTION("Processor Thermal Reporting Device Driver");
 468 MODULE_LICENSE("GPL v2");