drivers/thermal/intel_pch_thermal.c

   1 /* intel_pch_thermal.c - Intel PCH Thermal driver
   2  *
   3  * Copyright (c) 2015, Intel Corporation.
   4  *
   5  * Authors:
   6  *     Tushar Dave <tushar.n.dave@intel.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms and conditions of the GNU General Public License,
  10  * version 2, as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/types.h>
  21 #include <linux/init.h>
  22 #include <linux/pci.h>
  23 #include <linux/acpi.h>
  24 #include <linux/thermal.h>
  25 #include <linux/pm.h>
  26
  27 /* Intel PCH thermal Device IDs */
  28 #define PCH_THERMAL_DID_HSW_1   0x9C24 /* Haswell PCH */
  29 #define PCH_THERMAL_DID_HSW_2   0x8C24 /* Haswell PCH */
  30 #define PCH_THERMAL_DID_WPT     0x9CA4 /* Wildcat Point */
  31 #define PCH_THERMAL_DID_SKL     0x9D31 /* Skylake PCH */
  32
  33 /* Wildcat Point-LP  PCH Thermal registers */
  34 #define WPT_TEMP        0x0000  /* Temperature */
  35 #define WPT_TSC 0x04    /* Thermal Sensor Control */
  36 #define WPT_TSS 0x06    /* Thermal Sensor Status */
  37 #define WPT_TSEL        0x08    /* Thermal Sensor Enable and Lock */
  38 #define WPT_TSREL       0x0A    /* Thermal Sensor Report Enable and Lock */
  39 #define WPT_TSMIC       0x0C    /* Thermal Sensor SMI Control */
  40 #define WPT_CTT 0x0010  /* Catastrophic Trip Point */
  41 #define WPT_TAHV        0x0014  /* Thermal Alert High Value */
  42 #define WPT_TALV        0x0018  /* Thermal Alert Low Value */
  43 #define WPT_TL          0x00000040      /* Throttle Value */
  44 #define WPT_PHL 0x0060  /* PCH Hot Level */
  45 #define WPT_PHLC        0x62    /* PHL Control */
  46 #define WPT_TAS 0x80    /* Thermal Alert Status */
  47 #define WPT_TSPIEN      0x82    /* PCI Interrupt Event Enables */
  48 #define WPT_TSGPEN      0x84    /* General Purpose Event Enables */
  49
  50 /*  Wildcat Point-LP  PCH Thermal Register bit definitions */
  51 #define WPT_TEMP_TSR    0x00ff  /* Temp TS Reading */
  52 #define WPT_TSC_CPDE    0x01    /* Catastrophic Power-Down Enable */
  53 #define WPT_TSS_TSDSS   0x10    /* Thermal Sensor Dynamic Shutdown Status */
  54 #define WPT_TSS_GPES    0x08    /* GPE status */
  55 #define WPT_TSEL_ETS    0x01    /* Enable TS */
  56 #define WPT_TSEL_PLDB   0x80    /* TSEL Policy Lock-Down Bit */
  57 #define WPT_TL_TOL      0x000001FF      /* T0 Level */
  58 #define WPT_TL_T1L      0x1ff00000      /* T1 Level */
  59 #define WPT_TL_TTEN     0x20000000      /* TT Enable */
  60
  61 static char driver_name[] = "Intel PCH thermal driver";
  62
  63 struct pch_thermal_device {
  64         void __iomem *hw_base;
  65         const struct pch_dev_ops *ops;
  66         struct pci_dev *pdev;
  67         struct thermal_zone_device *tzd;
  68         int crt_trip_id;
  69         unsigned long crt_temp;
  70         int hot_trip_id;
  71         unsigned long hot_temp;
  72         int psv_trip_id;
  73         unsigned long psv_temp;
  74         bool bios_enabled;
  75 };
  76
  77 #ifdef CONFIG_ACPI
  78
  79 /*
  80  * On some platforms, there is a companion ACPI device, which adds
  81  * passive trip temperature using _PSV method. There is no specific
  82  * passive temperature setting in MMIO interface of this PCI device.
  83  */
  84 static void pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,
  85                                       int *nr_trips)
  86 {
  87         struct acpi_device *adev;
  88
  89         ptd->psv_trip_id = -1;
  90
  91         adev = ACPI_COMPANION(&ptd->pdev->dev);
  92         if (adev) {
  93                 unsigned long long r;
  94                 acpi_status status;
  95
  96                 status = acpi_evaluate_integer(adev->handle, "_PSV", NULL,
  97                                                &r);
  98                 if (ACPI_SUCCESS(status)) {
  99                         unsigned long trip_temp;
 100
 101                         trip_temp = DECI_KELVIN_TO_MILLICELSIUS(r);
 102                         if (trip_temp) {
 103                                 ptd->psv_temp = trip_temp;
 104                                 ptd->psv_trip_id = *nr_trips;
 105                                 ++(*nr_trips);
 106                         }
 107                 }
 108         }
 109 }
 110 #else
 111 static void pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,
 112                                       int *nr_trips)
 113 {
 114         ptd->psv_trip_id = -1;
 115
 116 }
 117 #endif
 118
 119 static int pch_wpt_init(struct pch_thermal_device *ptd, int *nr_trips)
 120 {
 121         u8 tsel;
 122         u16 trip_temp;
 123
 124         *nr_trips = 0;
 125
 126         /* Check if BIOS has already enabled thermal sensor */
 127         if (WPT_TSS_TSDSS & readb(ptd->hw_base + WPT_TSS)) {
 128                 ptd->bios_enabled = true;
 129                 goto read_trips;
 130         }
 131
 132         tsel = readb(ptd->hw_base + WPT_TSEL);
 133         /*
 134          * When TSEL's Policy Lock-Down bit is 1, TSEL become RO.
 135          * If so, thermal sensor cannot enable. Bail out.
 136          */
 137         if (tsel & WPT_TSEL_PLDB) {
 138                 dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
 139                 return -ENODEV;
 140         }
 141
 142         writeb(tsel|WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL);
 143         if (!(WPT_TSS_TSDSS & readb(ptd->hw_base + WPT_TSS))) {
 144                 dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
 145                 return -ENODEV;
 146         }
 147
 148 read_trips:
 149         ptd->crt_trip_id = -1;
 150         trip_temp = readw(ptd->hw_base + WPT_CTT);
 151         trip_temp &= 0x1FF;
 152         if (trip_temp) {
 153                 /* Resolution of 1/2 degree C and an offset of -50C */
 154                 ptd->crt_temp = trip_temp * 1000 / 2 - 50000;
 155                 ptd->crt_trip_id = 0;
 156                 ++(*nr_trips);
 157         }
 158
 159         ptd->hot_trip_id = -1;
 160         trip_temp = readw(ptd->hw_base + WPT_PHL);
 161         trip_temp &= 0x1FF;
 162         if (trip_temp) {
 163                 /* Resolution of 1/2 degree C and an offset of -50C */
 164                 ptd->hot_temp = trip_temp * 1000 / 2 - 50000;
 165                 ptd->hot_trip_id = *nr_trips;
 166                 ++(*nr_trips);
 167         }
 168
 169         pch_wpt_add_acpi_psv_trip(ptd, nr_trips);
 170
 171         return 0;
 172 }
 173
 174 static int pch_wpt_get_temp(struct pch_thermal_device *ptd, int *temp)
 175 {
 176         u8 wpt_temp;
 177
 178         wpt_temp = WPT_TEMP_TSR & readl(ptd->hw_base + WPT_TEMP);
 179
 180         /* Resolution of 1/2 degree C and an offset of -50C */
 181         *temp = (wpt_temp * 1000 / 2 - 50000);
 182
 183         return 0;
 184 }
 185
 186 static int pch_wpt_suspend(struct pch_thermal_device *ptd)
 187 {
 188         u8 tsel;
 189
 190         if (ptd->bios_enabled)
 191                 return 0;
 192
 193         tsel = readb(ptd->hw_base + WPT_TSEL);
 194
 195         writeb(tsel & 0xFE, ptd->hw_base + WPT_TSEL);
 196
 197         return 0;
 198 }
 199
 200 static int pch_wpt_resume(struct pch_thermal_device *ptd)
 201 {
 202         u8 tsel;
 203
 204         if (ptd->bios_enabled)
 205                 return 0;
 206
 207         tsel = readb(ptd->hw_base + WPT_TSEL);
 208
 209         writeb(tsel | WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL);
 210
 211         return 0;
 212 }
 213
 214 struct pch_dev_ops {
 215         int (*hw_init)(struct pch_thermal_device *ptd, int *nr_trips);
 216         int (*get_temp)(struct pch_thermal_device *ptd, int *temp);
 217         int (*suspend)(struct pch_thermal_device *ptd);
 218         int (*resume)(struct pch_thermal_device *ptd);
 219 };
 220
 221
 222 /* dev ops for Wildcat Point */
 223 static const struct pch_dev_ops pch_dev_ops_wpt = {
 224         .hw_init = pch_wpt_init,
 225         .get_temp = pch_wpt_get_temp,
 226         .suspend = pch_wpt_suspend,
 227         .resume = pch_wpt_resume,
 228 };
 229
 230 static int pch_thermal_get_temp(struct thermal_zone_device *tzd, int *temp)
 231 {
 232         struct pch_thermal_device *ptd = tzd->devdata;
 233
 234         return  ptd->ops->get_temp(ptd, temp);
 235 }
 236
 237 static int pch_get_trip_type(struct thermal_zone_device *tzd, int trip,
 238                              enum thermal_trip_type *type)
 239 {
 240         struct pch_thermal_device *ptd = tzd->devdata;
 241
 242         if (ptd->crt_trip_id == trip)
 243                 *type = THERMAL_TRIP_CRITICAL;
 244         else if (ptd->hot_trip_id == trip)
 245                 *type = THERMAL_TRIP_HOT;
 246         else if (ptd->psv_trip_id == trip)
 247                 *type = THERMAL_TRIP_PASSIVE;
 248         else
 249                 return -EINVAL;
 250
 251         return 0;
 252 }
 253
 254 static int pch_get_trip_temp(struct thermal_zone_device *tzd, int trip, int *temp)
 255 {
 256         struct pch_thermal_device *ptd = tzd->devdata;
 257
 258         if (ptd->crt_trip_id == trip)
 259                 *temp = ptd->crt_temp;
 260         else if (ptd->hot_trip_id == trip)
 261                 *temp = ptd->hot_temp;
 262         else if (ptd->psv_trip_id == trip)
 263                 *temp = ptd->psv_temp;
 264         else
 265                 return -EINVAL;
 266
 267         return 0;
 268 }
 269
 270 static struct thermal_zone_device_ops tzd_ops = {
 271         .get_temp = pch_thermal_get_temp,
 272         .get_trip_type = pch_get_trip_type,
 273         .get_trip_temp = pch_get_trip_temp,
 274 };
 275
 276
 277 static int intel_pch_thermal_probe(struct pci_dev *pdev,
 278                                    const struct pci_device_id *id)
 279 {
 280         struct pch_thermal_device *ptd;
 281         int err;
 282         int nr_trips;
 283         char *dev_name;
 284
 285         ptd = devm_kzalloc(&pdev->dev, sizeof(*ptd), GFP_KERNEL);
 286         if (!ptd)
 287                 return -ENOMEM;
 288
 289         switch (pdev->device) {
 290         case PCH_THERMAL_DID_WPT:
 291                 ptd->ops = &pch_dev_ops_wpt;
 292                 dev_name = "pch_wildcat_point";
 293                 break;
 294         case PCH_THERMAL_DID_SKL:
 295                 ptd->ops = &pch_dev_ops_wpt;
 296                 dev_name = "pch_skylake";
 297                 break;
 298         case PCH_THERMAL_DID_HSW_1:
 299         case PCH_THERMAL_DID_HSW_2:
 300                 ptd->ops = &pch_dev_ops_wpt;
 301                 dev_name = "pch_haswell";
 302                 break;
 303         default:
 304                 dev_err(&pdev->dev, "unknown pch thermal device\n");
 305                 return -ENODEV;
 306         }
 307
 308         pci_set_drvdata(pdev, ptd);
 309         ptd->pdev = pdev;
 310
 311         err = pci_enable_device(pdev);
 312         if (err) {
 313                 dev_err(&pdev->dev, "failed to enable pci device\n");
 314                 return err;
 315         }
 316
 317         err = pci_request_regions(pdev, driver_name);
 318         if (err) {
 319                 dev_err(&pdev->dev, "failed to request pci region\n");
 320                 goto error_disable;
 321         }
 322
 323         ptd->hw_base = pci_ioremap_bar(pdev, 0);
 324         if (!ptd->hw_base) {
 325                 err = -ENOMEM;
 326                 dev_err(&pdev->dev, "failed to map mem base\n");
 327                 goto error_release;
 328         }
 329
 330         err = ptd->ops->hw_init(ptd, &nr_trips);
 331         if (err)
 332                 goto error_cleanup;
 333
 334         ptd->tzd = thermal_zone_device_register(dev_name, nr_trips, 0, ptd,
 335                                                 &tzd_ops, NULL, 0, 0);
 336         if (IS_ERR(ptd->tzd)) {
 337                 dev_err(&pdev->dev, "Failed to register thermal zone %s\n",
 338                         dev_name);
 339                 err = PTR_ERR(ptd->tzd);
 340                 goto error_cleanup;
 341         }
 342
 343         return 0;
 344
 345 error_cleanup:
 346         iounmap(ptd->hw_base);
 347 error_release:
 348         pci_release_regions(pdev);
 349 error_disable:
 350         pci_disable_device(pdev);
 351         dev_err(&pdev->dev, "pci device failed to probe\n");
 352         return err;
 353 }
 354
 355 static void intel_pch_thermal_remove(struct pci_dev *pdev)
 356 {
 357         struct pch_thermal_device *ptd = pci_get_drvdata(pdev);
 358
 359         thermal_zone_device_unregister(ptd->tzd);
 360         iounmap(ptd->hw_base);
 361         pci_set_drvdata(pdev, NULL);
 362         pci_release_region(pdev, 0);
 363         pci_disable_device(pdev);
 364 }
 365
 366 static int intel_pch_thermal_suspend(struct device *device)
 367 {
 368         struct pci_dev *pdev = to_pci_dev(device);
 369         struct pch_thermal_device *ptd = pci_get_drvdata(pdev);
 370
 371         return ptd->ops->suspend(ptd);
 372 }
 373
 374 static int intel_pch_thermal_resume(struct device *device)
 375 {
 376         struct pci_dev *pdev = to_pci_dev(device);
 377         struct pch_thermal_device *ptd = pci_get_drvdata(pdev);
 378
 379         return ptd->ops->resume(ptd);
 380 }
 381
 382 static struct pci_device_id intel_pch_thermal_id[] = {
 383         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_WPT) },
 384         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_SKL) },
 385         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_HSW_1) },
 386         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_HSW_2) },
 387         { 0, },
 388 };
 389 MODULE_DEVICE_TABLE(pci, intel_pch_thermal_id);
 390
 391 static const struct dev_pm_ops intel_pch_pm_ops = {
 392         .suspend = intel_pch_thermal_suspend,
 393         .resume = intel_pch_thermal_resume,
 394 };
 395
 396 static struct pci_driver intel_pch_thermal_driver = {
 397         .name           = "intel_pch_thermal",
 398         .id_table       = intel_pch_thermal_id,
 399         .probe          = intel_pch_thermal_probe,
 400         .remove         = intel_pch_thermal_remove,
 401         .driver.pm      = &intel_pch_pm_ops,
 402 };
 403
 404 module_pci_driver(intel_pch_thermal_driver);
 405
 406 MODULE_LICENSE("GPL v2");
 407 MODULE_DESCRIPTION("Intel PCH Thermal driver");