1 /* intel_pch_thermal.c - Intel PCH Thermal driver
3 * Copyright (c) 2015, Intel Corporation.
6 * Tushar Dave <tushar.n.dave@intel.com>
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.
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
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>
25 /* Intel PCH thermal Device IDs */
26 #define PCH_THERMAL_DID_WPT 0x9CA4 /* Wildcat Point */
28 /* Wildcat Point-LP PCH Thermal registers */
29 #define WPT_TEMP 0x0000 /* Temperature */
30 #define WPT_TSC 0x04 /* Thermal Sensor Control */
31 #define WPT_TSS 0x06 /* Thermal Sensor Status */
32 #define WPT_TSEL 0x08 /* Thermal Sensor Enable and Lock */
33 #define WPT_TSREL 0x0A /* Thermal Sensor Report Enable and Lock */
34 #define WPT_TSMIC 0x0C /* Thermal Sensor SMI Control */
35 #define WPT_CTT 0x0010 /* Catastrophic Trip Point */
36 #define WPT_TAHV 0x0014 /* Thermal Alert High Value */
37 #define WPT_TALV 0x0018 /* Thermal Alert Low Value */
38 #define WPT_TL 0x00000040 /* Throttle Value */
39 #define WPT_PHL 0x0060 /* PCH Hot Level */
40 #define WPT_PHLC 0x62 /* PHL Control */
41 #define WPT_TAS 0x80 /* Thermal Alert Status */
42 #define WPT_TSPIEN 0x82 /* PCI Interrupt Event Enables */
43 #define WPT_TSGPEN 0x84 /* General Purpose Event Enables */
45 /* Wildcat Point-LP PCH Thermal Register bit definitions */
46 #define WPT_TEMP_TSR 0x00ff /* Temp TS Reading */
47 #define WPT_TSC_CPDE 0x01 /* Catastrophic Power-Down Enable */
48 #define WPT_TSS_TSDSS 0x10 /* Thermal Sensor Dynamic Shutdown Status */
49 #define WPT_TSS_GPES 0x08 /* GPE status */
50 #define WPT_TSEL_ETS 0x01 /* Enable TS */
51 #define WPT_TSEL_PLDB 0x80 /* TSEL Policy Lock-Down Bit */
52 #define WPT_TL_TOL 0x000001FF /* T0 Level */
53 #define WPT_TL_T1L 0x1ff00000 /* T1 Level */
54 #define WPT_TL_TTEN 0x20000000 /* TT Enable */
56 static char driver_name[] = "Intel PCH thermal driver";
58 struct pch_thermal_device {
59 void __iomem *hw_base;
60 const struct pch_dev_ops *ops;
62 struct thermal_zone_device *tzd;
64 unsigned long crt_temp;
66 unsigned long hot_temp;
69 static int pch_wpt_init(struct pch_thermal_device *ptd, int *nr_trips)
76 /* Check if BIOS has already enabled thermal sensor */
77 if (WPT_TSS_TSDSS & readb(ptd->hw_base + WPT_TSS))
80 tsel = readb(ptd->hw_base + WPT_TSEL);
82 * When TSEL's Policy Lock-Down bit is 1, TSEL become RO.
83 * If so, thermal sensor cannot enable. Bail out.
85 if (tsel & WPT_TSEL_PLDB) {
86 dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
90 writeb(tsel|WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL);
91 if (!(WPT_TSS_TSDSS & readb(ptd->hw_base + WPT_TSS))) {
92 dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
97 ptd->crt_trip_id = -1;
98 trip_temp = readw(ptd->hw_base + WPT_CTT);
101 /* Resolution of 1/2 degree C and an offset of -50C */
102 ptd->crt_temp = trip_temp * 1000 / 2 - 50000;
103 ptd->crt_trip_id = 0;
107 ptd->hot_trip_id = -1;
108 trip_temp = readw(ptd->hw_base + WPT_PHL);
111 /* Resolution of 1/2 degree C and an offset of -50C */
112 ptd->hot_temp = trip_temp * 1000 / 2 - 50000;
113 ptd->hot_trip_id = *nr_trips;
120 static int pch_wpt_get_temp(struct pch_thermal_device *ptd, int *temp)
124 wpt_temp = WPT_TEMP_TSR & readl(ptd->hw_base + WPT_TEMP);
126 /* Resolution of 1/2 degree C and an offset of -50C */
127 *temp = (wpt_temp * 1000 / 2 - 50000);
133 int (*hw_init)(struct pch_thermal_device *ptd, int *nr_trips);
134 int (*get_temp)(struct pch_thermal_device *ptd, int *temp);
138 /* dev ops for Wildcat Point */
139 static struct pch_dev_ops pch_dev_ops_wpt = {
140 .hw_init = pch_wpt_init,
141 .get_temp = pch_wpt_get_temp,
144 static int pch_thermal_get_temp(struct thermal_zone_device *tzd, int *temp)
146 struct pch_thermal_device *ptd = tzd->devdata;
148 return ptd->ops->get_temp(ptd, temp);
151 static int pch_get_trip_type(struct thermal_zone_device *tzd, int trip,
152 enum thermal_trip_type *type)
154 struct pch_thermal_device *ptd = tzd->devdata;
156 if (ptd->crt_trip_id == trip)
157 *type = THERMAL_TRIP_CRITICAL;
158 else if (ptd->hot_trip_id == trip)
159 *type = THERMAL_TRIP_HOT;
166 static int pch_get_trip_temp(struct thermal_zone_device *tzd, int trip, int *temp)
168 struct pch_thermal_device *ptd = tzd->devdata;
170 if (ptd->crt_trip_id == trip)
171 *temp = ptd->crt_temp;
172 else if (ptd->hot_trip_id == trip)
173 *temp = ptd->hot_temp;
180 static struct thermal_zone_device_ops tzd_ops = {
181 .get_temp = pch_thermal_get_temp,
182 .get_trip_type = pch_get_trip_type,
183 .get_trip_temp = pch_get_trip_temp,
187 static int intel_pch_thermal_probe(struct pci_dev *pdev,
188 const struct pci_device_id *id)
190 struct pch_thermal_device *ptd;
195 ptd = devm_kzalloc(&pdev->dev, sizeof(*ptd), GFP_KERNEL);
199 switch (pdev->device) {
200 case PCH_THERMAL_DID_WPT:
201 ptd->ops = &pch_dev_ops_wpt;
202 dev_name = "pch_wildcat_point";
205 dev_err(&pdev->dev, "unknown pch thermal device\n");
209 pci_set_drvdata(pdev, ptd);
212 err = pci_enable_device(pdev);
214 dev_err(&pdev->dev, "failed to enable pci device\n");
218 err = pci_request_regions(pdev, driver_name);
220 dev_err(&pdev->dev, "failed to request pci region\n");
224 ptd->hw_base = pci_ioremap_bar(pdev, 0);
227 dev_err(&pdev->dev, "failed to map mem base\n");
231 err = ptd->ops->hw_init(ptd, &nr_trips);
235 ptd->tzd = thermal_zone_device_register(dev_name, nr_trips, 0, ptd,
236 &tzd_ops, NULL, 0, 0);
237 if (IS_ERR(ptd->tzd)) {
238 dev_err(&pdev->dev, "Failed to register thermal zone %s\n",
240 err = PTR_ERR(ptd->tzd);
247 iounmap(ptd->hw_base);
249 pci_release_regions(pdev);
251 pci_disable_device(pdev);
252 dev_err(&pdev->dev, "pci device failed to probe\n");
256 static void intel_pch_thermal_remove(struct pci_dev *pdev)
258 struct pch_thermal_device *ptd = pci_get_drvdata(pdev);
260 thermal_zone_device_unregister(ptd->tzd);
261 iounmap(ptd->hw_base);
262 pci_set_drvdata(pdev, NULL);
263 pci_release_region(pdev, 0);
264 pci_disable_device(pdev);
267 static struct pci_device_id intel_pch_thermal_id[] = {
268 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_WPT) },
271 MODULE_DEVICE_TABLE(pci, intel_pch_thermal_id);
273 static struct pci_driver intel_pch_thermal_driver = {
274 .name = "intel_pch_thermal",
275 .id_table = intel_pch_thermal_id,
276 .probe = intel_pch_thermal_probe,
277 .remove = intel_pch_thermal_remove,
280 module_pci_driver(intel_pch_thermal_driver);
282 MODULE_LICENSE("GPL v2");
283 MODULE_DESCRIPTION("Intel PCH Thermal driver");