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/thermal.h>
  24
  25 /* Intel PCH thermal Device IDs */
  26 #define PCH_THERMAL_DID_WPT     0x9CA4 /* Wildcat Point */
  27 #define PCH_THERMAL_DID_SKL     0x9D31 /* Skylake PCH */
  28
  29 /* Wildcat Point-LP  PCH Thermal registers */
  30 #define WPT_TEMP        0x0000  /* Temperature */
  31 #define WPT_TSC 0x04    /* Thermal Sensor Control */
  32 #define WPT_TSS 0x06    /* Thermal Sensor Status */
  33 #define WPT_TSEL        0x08    /* Thermal Sensor Enable and Lock */
  34 #define WPT_TSREL       0x0A    /* Thermal Sensor Report Enable and Lock */
  35 #define WPT_TSMIC       0x0C    /* Thermal Sensor SMI Control */
  36 #define WPT_CTT 0x0010  /* Catastrophic Trip Point */
  37 #define WPT_TAHV        0x0014  /* Thermal Alert High Value */
  38 #define WPT_TALV        0x0018  /* Thermal Alert Low Value */
  39 #define WPT_TL          0x00000040      /* Throttle Value */
  40 #define WPT_PHL 0x0060  /* PCH Hot Level */
  41 #define WPT_PHLC        0x62    /* PHL Control */
  42 #define WPT_TAS 0x80    /* Thermal Alert Status */
  43 #define WPT_TSPIEN      0x82    /* PCI Interrupt Event Enables */
  44 #define WPT_TSGPEN      0x84    /* General Purpose Event Enables */
  45
  46 /*  Wildcat Point-LP  PCH Thermal Register bit definitions */
  47 #define WPT_TEMP_TSR    0x00ff  /* Temp TS Reading */
  48 #define WPT_TSC_CPDE    0x01    /* Catastrophic Power-Down Enable */
  49 #define WPT_TSS_TSDSS   0x10    /* Thermal Sensor Dynamic Shutdown Status */
  50 #define WPT_TSS_GPES    0x08    /* GPE status */
  51 #define WPT_TSEL_ETS    0x01    /* Enable TS */
  52 #define WPT_TSEL_PLDB   0x80    /* TSEL Policy Lock-Down Bit */
  53 #define WPT_TL_TOL      0x000001FF      /* T0 Level */
  54 #define WPT_TL_T1L      0x1ff00000      /* T1 Level */
  55 #define WPT_TL_TTEN     0x20000000      /* TT Enable */
  56
  57 static char driver_name[] = "Intel PCH thermal driver";
  58
  59 struct pch_thermal_device {
  60         void __iomem *hw_base;
  61         const struct pch_dev_ops *ops;
  62         struct pci_dev *pdev;
  63         struct thermal_zone_device *tzd;
  64         int crt_trip_id;
  65         unsigned long crt_temp;
  66         int hot_trip_id;
  67         unsigned long hot_temp;
  68 };
  69
  70 static int pch_wpt_init(struct pch_thermal_device *ptd, int *nr_trips)
  71 {
  72         u8 tsel;
  73         u16 trip_temp;
  74
  75         *nr_trips = 0;
  76
  77         /* Check if BIOS has already enabled thermal sensor */
  78         if (WPT_TSS_TSDSS & readb(ptd->hw_base + WPT_TSS))
  79                 goto read_trips;
  80
  81         tsel = readb(ptd->hw_base + WPT_TSEL);
  82         /*
  83          * When TSEL's Policy Lock-Down bit is 1, TSEL become RO.
  84          * If so, thermal sensor cannot enable. Bail out.
  85          */
  86         if (tsel & WPT_TSEL_PLDB) {
  87                 dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
  88                 return -ENODEV;
  89         }
  90
  91         writeb(tsel|WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL);
  92         if (!(WPT_TSS_TSDSS & readb(ptd->hw_base + WPT_TSS))) {
  93                 dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
  94                 return -ENODEV;
  95         }
  96
  97 read_trips:
  98         ptd->crt_trip_id = -1;
  99         trip_temp = readw(ptd->hw_base + WPT_CTT);
 100         trip_temp &= 0x1FF;
 101         if (trip_temp) {
 102                 /* Resolution of 1/2 degree C and an offset of -50C */
 103                 ptd->crt_temp = trip_temp * 1000 / 2 - 50000;
 104                 ptd->crt_trip_id = 0;
 105                 ++(*nr_trips);
 106         }
 107
 108         ptd->hot_trip_id = -1;
 109         trip_temp = readw(ptd->hw_base + WPT_PHL);
 110         trip_temp &= 0x1FF;
 111         if (trip_temp) {
 112                 /* Resolution of 1/2 degree C and an offset of -50C */
 113                 ptd->hot_temp = trip_temp * 1000 / 2 - 50000;
 114                 ptd->hot_trip_id = *nr_trips;
 115                 ++(*nr_trips);
 116         }
 117
 118         return 0;
 119 }
 120
 121 static int pch_wpt_get_temp(struct pch_thermal_device *ptd, int *temp)
 122 {
 123         u8 wpt_temp;
 124
 125         wpt_temp = WPT_TEMP_TSR & readl(ptd->hw_base + WPT_TEMP);
 126
 127         /* Resolution of 1/2 degree C and an offset of -50C */
 128         *temp = (wpt_temp * 1000 / 2 - 50000);
 129
 130         return 0;
 131 }
 132
 133 struct pch_dev_ops {
 134         int (*hw_init)(struct pch_thermal_device *ptd, int *nr_trips);
 135         int (*get_temp)(struct pch_thermal_device *ptd, int *temp);
 136 };
 137
 138
 139 /* dev ops for Wildcat Point */
 140 static const struct pch_dev_ops pch_dev_ops_wpt = {
 141         .hw_init = pch_wpt_init,
 142         .get_temp = pch_wpt_get_temp,
 143 };
 144
 145 static int pch_thermal_get_temp(struct thermal_zone_device *tzd, int *temp)
 146 {
 147         struct pch_thermal_device *ptd = tzd->devdata;
 148
 149         return  ptd->ops->get_temp(ptd, temp);
 150 }
 151
 152 static int pch_get_trip_type(struct thermal_zone_device *tzd, int trip,
 153                              enum thermal_trip_type *type)
 154 {
 155         struct pch_thermal_device *ptd = tzd->devdata;
 156
 157         if (ptd->crt_trip_id == trip)
 158                 *type = THERMAL_TRIP_CRITICAL;
 159         else if (ptd->hot_trip_id == trip)
 160                 *type = THERMAL_TRIP_HOT;
 161         else
 162                 return -EINVAL;
 163
 164         return 0;
 165 }
 166
 167 static int pch_get_trip_temp(struct thermal_zone_device *tzd, int trip, int *temp)
 168 {
 169         struct pch_thermal_device *ptd = tzd->devdata;
 170
 171         if (ptd->crt_trip_id == trip)
 172                 *temp = ptd->crt_temp;
 173         else if (ptd->hot_trip_id == trip)
 174                 *temp = ptd->hot_temp;
 175         else
 176                 return -EINVAL;
 177
 178         return 0;
 179 }
 180
 181 static struct thermal_zone_device_ops tzd_ops = {
 182         .get_temp = pch_thermal_get_temp,
 183         .get_trip_type = pch_get_trip_type,
 184         .get_trip_temp = pch_get_trip_temp,
 185 };
 186
 187
 188 static int intel_pch_thermal_probe(struct pci_dev *pdev,
 189                                    const struct pci_device_id *id)
 190 {
 191         struct pch_thermal_device *ptd;
 192         int err;
 193         int nr_trips;
 194         char *dev_name;
 195
 196         ptd = devm_kzalloc(&pdev->dev, sizeof(*ptd), GFP_KERNEL);
 197         if (!ptd)
 198                 return -ENOMEM;
 199
 200         switch (pdev->device) {
 201         case PCH_THERMAL_DID_WPT:
 202                 ptd->ops = &pch_dev_ops_wpt;
 203                 dev_name = "pch_wildcat_point";
 204                 break;
 205         case PCH_THERMAL_DID_SKL:
 206                 ptd->ops = &pch_dev_ops_wpt;
 207                 dev_name = "pch_skylake";
 208                 break;
 209         default:
 210                 dev_err(&pdev->dev, "unknown pch thermal device\n");
 211                 return -ENODEV;
 212         }
 213
 214         pci_set_drvdata(pdev, ptd);
 215         ptd->pdev = pdev;
 216
 217         err = pci_enable_device(pdev);
 218         if (err) {
 219                 dev_err(&pdev->dev, "failed to enable pci device\n");
 220                 return err;
 221         }
 222
 223         err = pci_request_regions(pdev, driver_name);
 224         if (err) {
 225                 dev_err(&pdev->dev, "failed to request pci region\n");
 226                 goto error_disable;
 227         }
 228
 229         ptd->hw_base = pci_ioremap_bar(pdev, 0);
 230         if (!ptd->hw_base) {
 231                 err = -ENOMEM;
 232                 dev_err(&pdev->dev, "failed to map mem base\n");
 233                 goto error_release;
 234         }
 235
 236         err = ptd->ops->hw_init(ptd, &nr_trips);
 237         if (err)
 238                 goto error_cleanup;
 239
 240         ptd->tzd = thermal_zone_device_register(dev_name, nr_trips, 0, ptd,
 241                                                 &tzd_ops, NULL, 0, 0);
 242         if (IS_ERR(ptd->tzd)) {
 243                 dev_err(&pdev->dev, "Failed to register thermal zone %s\n",
 244                         dev_name);
 245                 err = PTR_ERR(ptd->tzd);
 246                 goto error_cleanup;
 247         }
 248
 249         return 0;
 250
 251 error_cleanup:
 252         iounmap(ptd->hw_base);
 253 error_release:
 254         pci_release_regions(pdev);
 255 error_disable:
 256         pci_disable_device(pdev);
 257         dev_err(&pdev->dev, "pci device failed to probe\n");
 258         return err;
 259 }
 260
 261 static void intel_pch_thermal_remove(struct pci_dev *pdev)
 262 {
 263         struct pch_thermal_device *ptd = pci_get_drvdata(pdev);
 264
 265         thermal_zone_device_unregister(ptd->tzd);
 266         iounmap(ptd->hw_base);
 267         pci_set_drvdata(pdev, NULL);
 268         pci_release_region(pdev, 0);
 269         pci_disable_device(pdev);
 270 }
 271
 272 static struct pci_device_id intel_pch_thermal_id[] = {
 273         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_WPT) },
 274         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_SKL) },
 275         { 0, },
 276 };
 277 MODULE_DEVICE_TABLE(pci, intel_pch_thermal_id);
 278
 279 static struct pci_driver intel_pch_thermal_driver = {
 280         .name           = "intel_pch_thermal",
 281         .id_table       = intel_pch_thermal_id,
 282         .probe          = intel_pch_thermal_probe,
 283         .remove         = intel_pch_thermal_remove,
 284 };
 285
 286 module_pci_driver(intel_pch_thermal_driver);
 287
 288 MODULE_LICENSE("GPL v2");
 289 MODULE_DESCRIPTION("Intel PCH Thermal driver");