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