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 #define PCH_THERMAL_DID_SKL_H   0xA131 /* Skylake PCH 100 series */
  33
  34 /* Wildcat Point-LP  PCH Thermal registers */
  35 #define WPT_TEMP        0x0000  /* Temperature */
  36 #define WPT_TSC 0x04    /* Thermal Sensor Control */
  37 #define WPT_TSS 0x06    /* Thermal Sensor Status */
  38 #define WPT_TSEL        0x08    /* Thermal Sensor Enable and Lock */
  39 #define WPT_TSREL       0x0A    /* Thermal Sensor Report Enable and Lock */
  40 #define WPT_TSMIC       0x0C    /* Thermal Sensor SMI Control */
  41 #define WPT_CTT 0x0010  /* Catastrophic Trip Point */
  42 #define WPT_TAHV        0x0014  /* Thermal Alert High Value */
  43 #define WPT_TALV        0x0018  /* Thermal Alert Low Value */
  44 #define WPT_TL          0x00000040      /* Throttle Value */
  45 #define WPT_PHL 0x0060  /* PCH Hot Level */
  46 #define WPT_PHLC        0x62    /* PHL Control */
  47 #define WPT_TAS 0x80    /* Thermal Alert Status */
  48 #define WPT_TSPIEN      0x82    /* PCI Interrupt Event Enables */
  49 #define WPT_TSGPEN      0x84    /* General Purpose Event Enables */
  50
  51 /*  Wildcat Point-LP  PCH Thermal Register bit definitions */
  52 #define WPT_TEMP_TSR    0x01ff  /* Temp TS Reading */
  53 #define WPT_TSC_CPDE    0x01    /* Catastrophic Power-Down Enable */
  54 #define WPT_TSS_TSDSS   0x10    /* Thermal Sensor Dynamic Shutdown Status */
  55 #define WPT_TSS_GPES    0x08    /* GPE status */
  56 #define WPT_TSEL_ETS    0x01    /* Enable TS */
  57 #define WPT_TSEL_PLDB   0x80    /* TSEL Policy Lock-Down Bit */
  58 #define WPT_TL_TOL      0x000001FF      /* T0 Level */
  59 #define WPT_TL_T1L      0x1ff00000      /* T1 Level */
  60 #define WPT_TL_TTEN     0x20000000      /* TT Enable */
  61
  62 static char driver_name[] = "Intel PCH thermal driver";
  63
  64 struct pch_thermal_device {
  65         void __iomem *hw_base;
  66         const struct pch_dev_ops *ops;
  67         struct pci_dev *pdev;
  68         struct thermal_zone_device *tzd;
  69         int crt_trip_id;
  70         unsigned long crt_temp;
  71         int hot_trip_id;
  72         unsigned long hot_temp;
  73         int psv_trip_id;
  74         unsigned long psv_temp;
  75         bool bios_enabled;
  76 };
  77
  78 #ifdef CONFIG_ACPI
  79
  80 /*
  81  * On some platforms, there is a companion ACPI device, which adds
  82  * passive trip temperature using _PSV method. There is no specific
  83  * passive temperature setting in MMIO interface of this PCI device.
  84  */
  85 static void pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,
  86                                       int *nr_trips)
  87 {
  88         struct acpi_device *adev;
  89
  90         ptd->psv_trip_id = -1;
  91
  92         adev = ACPI_COMPANION(&ptd->pdev->dev);
  93         if (adev) {
  94                 unsigned long long r;
  95                 acpi_status status;
  96
  97                 status = acpi_evaluate_integer(adev->handle, "_PSV", NULL,
  98                                                &r);
  99                 if (ACPI_SUCCESS(status)) {
 100                         unsigned long trip_temp;
 101
 102                         trip_temp = DECI_KELVIN_TO_MILLICELSIUS(r);
 103                         if (trip_temp) {
 104                                 ptd->psv_temp = trip_temp;
 105                                 ptd->psv_trip_id = *nr_trips;
 106                                 ++(*nr_trips);
 107                         }
 108                 }
 109         }
 110 }
 111 #else
 112 static void pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,
 113                                       int *nr_trips)
 114 {
 115         ptd->psv_trip_id = -1;
 116
 117 }
 118 #endif
 119
 120 static int pch_wpt_init(struct pch_thermal_device *ptd, int *nr_trips)
 121 {
 122         u8 tsel;
 123         u16 trip_temp;
 124
 125         *nr_trips = 0;
 126
 127         /* Check if BIOS has already enabled thermal sensor */
 128         if (WPT_TSEL_ETS & readb(ptd->hw_base + WPT_TSEL)) {
 129                 ptd->bios_enabled = true;
 130                 goto read_trips;
 131         }
 132
 133         tsel = readb(ptd->hw_base + WPT_TSEL);
 134         /*
 135          * When TSEL's Policy Lock-Down bit is 1, TSEL become RO.
 136          * If so, thermal sensor cannot enable. Bail out.
 137          */
 138         if (tsel & WPT_TSEL_PLDB) {
 139                 dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
 140                 return -ENODEV;
 141         }
 142
 143         writeb(tsel|WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL);
 144         if (!(WPT_TSEL_ETS & readb(ptd->hw_base + WPT_TSEL))) {
 145                 dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
 146                 return -ENODEV;
 147         }
 148
 149 read_trips:
 150         ptd->crt_trip_id = -1;
 151         trip_temp = readw(ptd->hw_base + WPT_CTT);
 152         trip_temp &= 0x1FF;
 153         if (trip_temp) {
 154                 /* Resolution of 1/2 degree C and an offset of -50C */
 155                 ptd->crt_temp = trip_temp * 1000 / 2 - 50000;
 156                 ptd->crt_trip_id = 0;
 157                 ++(*nr_trips);
 158         }
 159
 160         ptd->hot_trip_id = -1;
 161         trip_temp = readw(ptd->hw_base + WPT_PHL);
 162         trip_temp &= 0x1FF;
 163         if (trip_temp) {
 164                 /* Resolution of 1/2 degree C and an offset of -50C */
 165                 ptd->hot_temp = trip_temp * 1000 / 2 - 50000;
 166                 ptd->hot_trip_id = *nr_trips;
 167                 ++(*nr_trips);
 168         }
 169
 170         pch_wpt_add_acpi_psv_trip(ptd, nr_trips);
 171
 172         return 0;
 173 }
 174
 175 static int pch_wpt_get_temp(struct pch_thermal_device *ptd, int *temp)
 176 {
 177         u16 wpt_temp;
 178
 179         wpt_temp = WPT_TEMP_TSR & readw(ptd->hw_base + WPT_TEMP);
 180
 181         /* Resolution of 1/2 degree C and an offset of -50C */
 182         *temp = (wpt_temp * 1000 / 2 - 50000);
 183
 184         return 0;
 185 }
 186
 187 static int pch_wpt_suspend(struct pch_thermal_device *ptd)
 188 {
 189         u8 tsel;
 190
 191         if (ptd->bios_enabled)
 192                 return 0;
 193
 194         tsel = readb(ptd->hw_base + WPT_TSEL);
 195
 196         writeb(tsel & 0xFE, ptd->hw_base + WPT_TSEL);
 197
 198         return 0;
 199 }
 200
 201 static int pch_wpt_resume(struct pch_thermal_device *ptd)
 202 {
 203         u8 tsel;
 204
 205         if (ptd->bios_enabled)
 206                 return 0;
 207
 208         tsel = readb(ptd->hw_base + WPT_TSEL);
 209
 210         writeb(tsel | WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL);
 211
 212         return 0;
 213 }
 214
 215 struct pch_dev_ops {
 216         int (*hw_init)(struct pch_thermal_device *ptd, int *nr_trips);
 217         int (*get_temp)(struct pch_thermal_device *ptd, int *temp);
 218         int (*suspend)(struct pch_thermal_device *ptd);
 219         int (*resume)(struct pch_thermal_device *ptd);
 220 };
 221
 222
 223 /* dev ops for Wildcat Point */
 224 static const struct pch_dev_ops pch_dev_ops_wpt = {
 225         .hw_init = pch_wpt_init,
 226         .get_temp = pch_wpt_get_temp,
 227         .suspend = pch_wpt_suspend,
 228         .resume = pch_wpt_resume,
 229 };
 230
 231 static int pch_thermal_get_temp(struct thermal_zone_device *tzd, int *temp)
 232 {
 233         struct pch_thermal_device *ptd = tzd->devdata;
 234
 235         return  ptd->ops->get_temp(ptd, temp);
 236 }
 237
 238 static int pch_get_trip_type(struct thermal_zone_device *tzd, int trip,
 239                              enum thermal_trip_type *type)
 240 {
 241         struct pch_thermal_device *ptd = tzd->devdata;
 242
 243         if (ptd->crt_trip_id == trip)
 244                 *type = THERMAL_TRIP_CRITICAL;
 245         else if (ptd->hot_trip_id == trip)
 246                 *type = THERMAL_TRIP_HOT;
 247         else if (ptd->psv_trip_id == trip)
 248                 *type = THERMAL_TRIP_PASSIVE;
 249         else
 250                 return -EINVAL;
 251
 252         return 0;
 253 }
 254
 255 static int pch_get_trip_temp(struct thermal_zone_device *tzd, int trip, int *temp)
 256 {
 257         struct pch_thermal_device *ptd = tzd->devdata;
 258
 259         if (ptd->crt_trip_id == trip)
 260                 *temp = ptd->crt_temp;
 261         else if (ptd->hot_trip_id == trip)
 262                 *temp = ptd->hot_temp;
 263         else if (ptd->psv_trip_id == trip)
 264                 *temp = ptd->psv_temp;
 265         else
 266                 return -EINVAL;
 267
 268         return 0;
 269 }
 270
 271 static struct thermal_zone_device_ops tzd_ops = {
 272         .get_temp = pch_thermal_get_temp,
 273         .get_trip_type = pch_get_trip_type,
 274         .get_trip_temp = pch_get_trip_temp,
 275 };
 276
 277 enum board_ids {
 278         board_hsw,
 279         board_wpt,
 280         board_skl,
 281 };
 282
 283 static const struct board_info {
 284         const char *name;
 285         const struct pch_dev_ops *ops;
 286 } board_info[] = {
 287         [board_hsw] = {
 288                 .name = "pch_haswell",
 289                 .ops = &pch_dev_ops_wpt,
 290         },
 291         [board_wpt] = {
 292                 .name = "pch_wildcat_point",
 293                 .ops = &pch_dev_ops_wpt,
 294         },
 295         [board_skl] = {
 296                 .name = "pch_skylake",
 297                 .ops = &pch_dev_ops_wpt,
 298         },
 299 };
 300
 301 static int intel_pch_thermal_probe(struct pci_dev *pdev,
 302                                    const struct pci_device_id *id)
 303 {
 304         enum board_ids board_id = id->driver_data;
 305         const struct board_info *bi = &board_info[board_id];
 306         struct pch_thermal_device *ptd;
 307         int err;
 308         int nr_trips;
 309
 310         ptd = devm_kzalloc(&pdev->dev, sizeof(*ptd), GFP_KERNEL);
 311         if (!ptd)
 312                 return -ENOMEM;
 313
 314         ptd->ops = bi->ops;
 315
 316         pci_set_drvdata(pdev, ptd);
 317         ptd->pdev = pdev;
 318
 319         err = pci_enable_device(pdev);
 320         if (err) {
 321                 dev_err(&pdev->dev, "failed to enable pci device\n");
 322                 return err;
 323         }
 324
 325         err = pci_request_regions(pdev, driver_name);
 326         if (err) {
 327                 dev_err(&pdev->dev, "failed to request pci region\n");
 328                 goto error_disable;
 329         }
 330
 331         ptd->hw_base = pci_ioremap_bar(pdev, 0);
 332         if (!ptd->hw_base) {
 333                 err = -ENOMEM;
 334                 dev_err(&pdev->dev, "failed to map mem base\n");
 335                 goto error_release;
 336         }
 337
 338         err = ptd->ops->hw_init(ptd, &nr_trips);
 339         if (err)
 340                 goto error_cleanup;
 341
 342         ptd->tzd = thermal_zone_device_register(bi->name, nr_trips, 0, ptd,
 343                                                 &tzd_ops, NULL, 0, 0);
 344         if (IS_ERR(ptd->tzd)) {
 345                 dev_err(&pdev->dev, "Failed to register thermal zone %s\n",
 346                         bi->name);
 347                 err = PTR_ERR(ptd->tzd);
 348                 goto error_cleanup;
 349         }
 350
 351         return 0;
 352
 353 error_cleanup:
 354         iounmap(ptd->hw_base);
 355 error_release:
 356         pci_release_regions(pdev);
 357 error_disable:
 358         pci_disable_device(pdev);
 359         dev_err(&pdev->dev, "pci device failed to probe\n");
 360         return err;
 361 }
 362
 363 static void intel_pch_thermal_remove(struct pci_dev *pdev)
 364 {
 365         struct pch_thermal_device *ptd = pci_get_drvdata(pdev);
 366
 367         thermal_zone_device_unregister(ptd->tzd);
 368         iounmap(ptd->hw_base);
 369         pci_set_drvdata(pdev, NULL);
 370         pci_release_region(pdev, 0);
 371         pci_disable_device(pdev);
 372 }
 373
 374 static int intel_pch_thermal_suspend(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->suspend(ptd);
 380 }
 381
 382 static int intel_pch_thermal_resume(struct device *device)
 383 {
 384         struct pci_dev *pdev = to_pci_dev(device);
 385         struct pch_thermal_device *ptd = pci_get_drvdata(pdev);
 386
 387         return ptd->ops->resume(ptd);
 388 }
 389
 390 static const struct pci_device_id intel_pch_thermal_id[] = {
 391         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_HSW_1),
 392                 .driver_data = board_hsw, },
 393         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_HSW_2),
 394                 .driver_data = board_hsw, },
 395         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_WPT),
 396                 .driver_data = board_wpt, },
 397         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_SKL),
 398                 .driver_data = board_skl, },
 399         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_SKL_H),
 400                 .driver_data = board_skl, },
 401         { 0, },
 402 };
 403 MODULE_DEVICE_TABLE(pci, intel_pch_thermal_id);
 404
 405 static const struct dev_pm_ops intel_pch_pm_ops = {
 406         .suspend = intel_pch_thermal_suspend,
 407         .resume = intel_pch_thermal_resume,
 408 };
 409
 410 static struct pci_driver intel_pch_thermal_driver = {
 411         .name           = "intel_pch_thermal",
 412         .id_table       = intel_pch_thermal_id,
 413         .probe          = intel_pch_thermal_probe,
 414         .remove         = intel_pch_thermal_remove,
 415         .driver.pm      = &intel_pch_pm_ops,
 416 };
 417
 418 module_pci_driver(intel_pch_thermal_driver);
 419
 420 MODULE_LICENSE("GPL v2");
 421 MODULE_DESCRIPTION("Intel PCH Thermal driver");