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/acpi.h>
24 #include <linux/thermal.h>
27 /* Intel PCH thermal Device IDs */
28 #define PCH_THERMAL_DID_WPT 0x9CA4 /* Wildcat Point */
29 #define PCH_THERMAL_DID_SKL 0x9D31 /* Skylake PCH */
31 /* Wildcat Point-LP PCH Thermal registers */
32 #define WPT_TEMP 0x0000 /* Temperature */
33 #define WPT_TSC 0x04 /* Thermal Sensor Control */
34 #define WPT_TSS 0x06 /* Thermal Sensor Status */
35 #define WPT_TSEL 0x08 /* Thermal Sensor Enable and Lock */
36 #define WPT_TSREL 0x0A /* Thermal Sensor Report Enable and Lock */
37 #define WPT_TSMIC 0x0C /* Thermal Sensor SMI Control */
38 #define WPT_CTT 0x0010 /* Catastrophic Trip Point */
39 #define WPT_TAHV 0x0014 /* Thermal Alert High Value */
40 #define WPT_TALV 0x0018 /* Thermal Alert Low Value */
41 #define WPT_TL 0x00000040 /* Throttle Value */
42 #define WPT_PHL 0x0060 /* PCH Hot Level */
43 #define WPT_PHLC 0x62 /* PHL Control */
44 #define WPT_TAS 0x80 /* Thermal Alert Status */
45 #define WPT_TSPIEN 0x82 /* PCI Interrupt Event Enables */
46 #define WPT_TSGPEN 0x84 /* General Purpose Event Enables */
48 /* Wildcat Point-LP PCH Thermal Register bit definitions */
49 #define WPT_TEMP_TSR 0x00ff /* Temp TS Reading */
50 #define WPT_TSC_CPDE 0x01 /* Catastrophic Power-Down Enable */
51 #define WPT_TSS_TSDSS 0x10 /* Thermal Sensor Dynamic Shutdown Status */
52 #define WPT_TSS_GPES 0x08 /* GPE status */
53 #define WPT_TSEL_ETS 0x01 /* Enable TS */
54 #define WPT_TSEL_PLDB 0x80 /* TSEL Policy Lock-Down Bit */
55 #define WPT_TL_TOL 0x000001FF /* T0 Level */
56 #define WPT_TL_T1L 0x1ff00000 /* T1 Level */
57 #define WPT_TL_TTEN 0x20000000 /* TT Enable */
59 static char driver_name[] = "Intel PCH thermal driver";
61 struct pch_thermal_device {
62 void __iomem *hw_base;
63 const struct pch_dev_ops *ops;
65 struct thermal_zone_device *tzd;
67 unsigned long crt_temp;
69 unsigned long hot_temp;
71 unsigned long psv_temp;
78 * On some platforms, there is a companion ACPI device, which adds
79 * passive trip temperature using _PSV method. There is no specific
80 * passive temperature setting in MMIO interface of this PCI device.
82 static void pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,
85 struct acpi_device *adev;
87 ptd->psv_trip_id = -1;
89 adev = ACPI_COMPANION(&ptd->pdev->dev);
94 status = acpi_evaluate_integer(adev->handle, "_PSV", NULL,
96 if (ACPI_SUCCESS(status)) {
97 unsigned long trip_temp;
99 trip_temp = DECI_KELVIN_TO_MILLICELSIUS(r);
101 ptd->psv_temp = trip_temp;
102 ptd->psv_trip_id = *nr_trips;
109 static void pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,
112 ptd->psv_trip_id = -1;
117 static int pch_wpt_init(struct pch_thermal_device *ptd, int *nr_trips)
124 /* Check if BIOS has already enabled thermal sensor */
125 if (WPT_TSS_TSDSS & readb(ptd->hw_base + WPT_TSS)) {
126 ptd->bios_enabled = true;
130 tsel = readb(ptd->hw_base + WPT_TSEL);
132 * When TSEL's Policy Lock-Down bit is 1, TSEL become RO.
133 * If so, thermal sensor cannot enable. Bail out.
135 if (tsel & WPT_TSEL_PLDB) {
136 dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
140 writeb(tsel|WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL);
141 if (!(WPT_TSS_TSDSS & readb(ptd->hw_base + WPT_TSS))) {
142 dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
147 ptd->crt_trip_id = -1;
148 trip_temp = readw(ptd->hw_base + WPT_CTT);
151 /* Resolution of 1/2 degree C and an offset of -50C */
152 ptd->crt_temp = trip_temp * 1000 / 2 - 50000;
153 ptd->crt_trip_id = 0;
157 ptd->hot_trip_id = -1;
158 trip_temp = readw(ptd->hw_base + WPT_PHL);
161 /* Resolution of 1/2 degree C and an offset of -50C */
162 ptd->hot_temp = trip_temp * 1000 / 2 - 50000;
163 ptd->hot_trip_id = *nr_trips;
167 pch_wpt_add_acpi_psv_trip(ptd, nr_trips);
172 static int pch_wpt_get_temp(struct pch_thermal_device *ptd, int *temp)
176 wpt_temp = WPT_TEMP_TSR & readl(ptd->hw_base + WPT_TEMP);
178 /* Resolution of 1/2 degree C and an offset of -50C */
179 *temp = (wpt_temp * 1000 / 2 - 50000);
184 static int pch_wpt_suspend(struct pch_thermal_device *ptd)
188 if (ptd->bios_enabled)
191 tsel = readb(ptd->hw_base + WPT_TSEL);
193 writeb(tsel & 0xFE, ptd->hw_base + WPT_TSEL);
198 static int pch_wpt_resume(struct pch_thermal_device *ptd)
202 if (ptd->bios_enabled)
205 tsel = readb(ptd->hw_base + WPT_TSEL);
207 writeb(tsel | WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL);
213 int (*hw_init)(struct pch_thermal_device *ptd, int *nr_trips);
214 int (*get_temp)(struct pch_thermal_device *ptd, int *temp);
215 int (*suspend)(struct pch_thermal_device *ptd);
216 int (*resume)(struct pch_thermal_device *ptd);
220 /* dev ops for Wildcat Point */
221 static const struct pch_dev_ops pch_dev_ops_wpt = {
222 .hw_init = pch_wpt_init,
223 .get_temp = pch_wpt_get_temp,
224 .suspend = pch_wpt_suspend,
225 .resume = pch_wpt_resume,
228 static int pch_thermal_get_temp(struct thermal_zone_device *tzd, int *temp)
230 struct pch_thermal_device *ptd = tzd->devdata;
232 return ptd->ops->get_temp(ptd, temp);
235 static int pch_get_trip_type(struct thermal_zone_device *tzd, int trip,
236 enum thermal_trip_type *type)
238 struct pch_thermal_device *ptd = tzd->devdata;
240 if (ptd->crt_trip_id == trip)
241 *type = THERMAL_TRIP_CRITICAL;
242 else if (ptd->hot_trip_id == trip)
243 *type = THERMAL_TRIP_HOT;
244 else if (ptd->psv_trip_id == trip)
245 *type = THERMAL_TRIP_PASSIVE;
252 static int pch_get_trip_temp(struct thermal_zone_device *tzd, int trip, int *temp)
254 struct pch_thermal_device *ptd = tzd->devdata;
256 if (ptd->crt_trip_id == trip)
257 *temp = ptd->crt_temp;
258 else if (ptd->hot_trip_id == trip)
259 *temp = ptd->hot_temp;
260 else if (ptd->psv_trip_id == trip)
261 *temp = ptd->psv_temp;
268 static struct thermal_zone_device_ops tzd_ops = {
269 .get_temp = pch_thermal_get_temp,
270 .get_trip_type = pch_get_trip_type,
271 .get_trip_temp = pch_get_trip_temp,
275 static int intel_pch_thermal_probe(struct pci_dev *pdev,
276 const struct pci_device_id *id)
278 struct pch_thermal_device *ptd;
283 ptd = devm_kzalloc(&pdev->dev, sizeof(*ptd), GFP_KERNEL);
287 switch (pdev->device) {
288 case PCH_THERMAL_DID_WPT:
289 ptd->ops = &pch_dev_ops_wpt;
290 dev_name = "pch_wildcat_point";
292 case PCH_THERMAL_DID_SKL:
293 ptd->ops = &pch_dev_ops_wpt;
294 dev_name = "pch_skylake";
297 dev_err(&pdev->dev, "unknown pch thermal device\n");
301 pci_set_drvdata(pdev, ptd);
304 err = pci_enable_device(pdev);
306 dev_err(&pdev->dev, "failed to enable pci device\n");
310 err = pci_request_regions(pdev, driver_name);
312 dev_err(&pdev->dev, "failed to request pci region\n");
316 ptd->hw_base = pci_ioremap_bar(pdev, 0);
319 dev_err(&pdev->dev, "failed to map mem base\n");
323 err = ptd->ops->hw_init(ptd, &nr_trips);
327 ptd->tzd = thermal_zone_device_register(dev_name, nr_trips, 0, ptd,
328 &tzd_ops, NULL, 0, 0);
329 if (IS_ERR(ptd->tzd)) {
330 dev_err(&pdev->dev, "Failed to register thermal zone %s\n",
332 err = PTR_ERR(ptd->tzd);
339 iounmap(ptd->hw_base);
341 pci_release_regions(pdev);
343 pci_disable_device(pdev);
344 dev_err(&pdev->dev, "pci device failed to probe\n");
348 static void intel_pch_thermal_remove(struct pci_dev *pdev)
350 struct pch_thermal_device *ptd = pci_get_drvdata(pdev);
352 thermal_zone_device_unregister(ptd->tzd);
353 iounmap(ptd->hw_base);
354 pci_set_drvdata(pdev, NULL);
355 pci_release_region(pdev, 0);
356 pci_disable_device(pdev);
359 static int intel_pch_thermal_suspend(struct device *device)
361 struct pci_dev *pdev = to_pci_dev(device);
362 struct pch_thermal_device *ptd = pci_get_drvdata(pdev);
364 return ptd->ops->suspend(ptd);
367 static int intel_pch_thermal_resume(struct device *device)
369 struct pci_dev *pdev = to_pci_dev(device);
370 struct pch_thermal_device *ptd = pci_get_drvdata(pdev);
372 return ptd->ops->resume(ptd);
375 static struct pci_device_id intel_pch_thermal_id[] = {
376 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_WPT) },
377 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_SKL) },
380 MODULE_DEVICE_TABLE(pci, intel_pch_thermal_id);
382 static const struct dev_pm_ops intel_pch_pm_ops = {
383 .suspend = intel_pch_thermal_suspend,
384 .resume = intel_pch_thermal_resume,
387 static struct pci_driver intel_pch_thermal_driver = {
388 .name = "intel_pch_thermal",
389 .id_table = intel_pch_thermal_id,
390 .probe = intel_pch_thermal_probe,
391 .remove = intel_pch_thermal_remove,
392 .driver.pm = &intel_pch_pm_ops,
395 module_pci_driver(intel_pch_thermal_driver);
397 MODULE_LICENSE("GPL v2");
398 MODULE_DESCRIPTION("Intel PCH Thermal driver");