408 строки
10 KiB
C
408 строки
10 KiB
C
/* intel_pch_thermal.c - Intel PCH Thermal driver
|
|
*
|
|
* Copyright (c) 2015, Intel Corporation.
|
|
*
|
|
* Authors:
|
|
* Tushar Dave <tushar.n.dave@intel.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/init.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/thermal.h>
|
|
#include <linux/pm.h>
|
|
|
|
/* Intel PCH thermal Device IDs */
|
|
#define PCH_THERMAL_DID_HSW_1 0x9C24 /* Haswell PCH */
|
|
#define PCH_THERMAL_DID_HSW_2 0x8C24 /* Haswell PCH */
|
|
#define PCH_THERMAL_DID_WPT 0x9CA4 /* Wildcat Point */
|
|
#define PCH_THERMAL_DID_SKL 0x9D31 /* Skylake PCH */
|
|
|
|
/* Wildcat Point-LP PCH Thermal registers */
|
|
#define WPT_TEMP 0x0000 /* Temperature */
|
|
#define WPT_TSC 0x04 /* Thermal Sensor Control */
|
|
#define WPT_TSS 0x06 /* Thermal Sensor Status */
|
|
#define WPT_TSEL 0x08 /* Thermal Sensor Enable and Lock */
|
|
#define WPT_TSREL 0x0A /* Thermal Sensor Report Enable and Lock */
|
|
#define WPT_TSMIC 0x0C /* Thermal Sensor SMI Control */
|
|
#define WPT_CTT 0x0010 /* Catastrophic Trip Point */
|
|
#define WPT_TAHV 0x0014 /* Thermal Alert High Value */
|
|
#define WPT_TALV 0x0018 /* Thermal Alert Low Value */
|
|
#define WPT_TL 0x00000040 /* Throttle Value */
|
|
#define WPT_PHL 0x0060 /* PCH Hot Level */
|
|
#define WPT_PHLC 0x62 /* PHL Control */
|
|
#define WPT_TAS 0x80 /* Thermal Alert Status */
|
|
#define WPT_TSPIEN 0x82 /* PCI Interrupt Event Enables */
|
|
#define WPT_TSGPEN 0x84 /* General Purpose Event Enables */
|
|
|
|
/* Wildcat Point-LP PCH Thermal Register bit definitions */
|
|
#define WPT_TEMP_TSR 0x00ff /* Temp TS Reading */
|
|
#define WPT_TSC_CPDE 0x01 /* Catastrophic Power-Down Enable */
|
|
#define WPT_TSS_TSDSS 0x10 /* Thermal Sensor Dynamic Shutdown Status */
|
|
#define WPT_TSS_GPES 0x08 /* GPE status */
|
|
#define WPT_TSEL_ETS 0x01 /* Enable TS */
|
|
#define WPT_TSEL_PLDB 0x80 /* TSEL Policy Lock-Down Bit */
|
|
#define WPT_TL_TOL 0x000001FF /* T0 Level */
|
|
#define WPT_TL_T1L 0x1ff00000 /* T1 Level */
|
|
#define WPT_TL_TTEN 0x20000000 /* TT Enable */
|
|
|
|
static char driver_name[] = "Intel PCH thermal driver";
|
|
|
|
struct pch_thermal_device {
|
|
void __iomem *hw_base;
|
|
const struct pch_dev_ops *ops;
|
|
struct pci_dev *pdev;
|
|
struct thermal_zone_device *tzd;
|
|
int crt_trip_id;
|
|
unsigned long crt_temp;
|
|
int hot_trip_id;
|
|
unsigned long hot_temp;
|
|
int psv_trip_id;
|
|
unsigned long psv_temp;
|
|
bool bios_enabled;
|
|
};
|
|
|
|
#ifdef CONFIG_ACPI
|
|
|
|
/*
|
|
* On some platforms, there is a companion ACPI device, which adds
|
|
* passive trip temperature using _PSV method. There is no specific
|
|
* passive temperature setting in MMIO interface of this PCI device.
|
|
*/
|
|
static void pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,
|
|
int *nr_trips)
|
|
{
|
|
struct acpi_device *adev;
|
|
|
|
ptd->psv_trip_id = -1;
|
|
|
|
adev = ACPI_COMPANION(&ptd->pdev->dev);
|
|
if (adev) {
|
|
unsigned long long r;
|
|
acpi_status status;
|
|
|
|
status = acpi_evaluate_integer(adev->handle, "_PSV", NULL,
|
|
&r);
|
|
if (ACPI_SUCCESS(status)) {
|
|
unsigned long trip_temp;
|
|
|
|
trip_temp = DECI_KELVIN_TO_MILLICELSIUS(r);
|
|
if (trip_temp) {
|
|
ptd->psv_temp = trip_temp;
|
|
ptd->psv_trip_id = *nr_trips;
|
|
++(*nr_trips);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#else
|
|
static void pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,
|
|
int *nr_trips)
|
|
{
|
|
ptd->psv_trip_id = -1;
|
|
|
|
}
|
|
#endif
|
|
|
|
static int pch_wpt_init(struct pch_thermal_device *ptd, int *nr_trips)
|
|
{
|
|
u8 tsel;
|
|
u16 trip_temp;
|
|
|
|
*nr_trips = 0;
|
|
|
|
/* Check if BIOS has already enabled thermal sensor */
|
|
if (WPT_TSS_TSDSS & readb(ptd->hw_base + WPT_TSS)) {
|
|
ptd->bios_enabled = true;
|
|
goto read_trips;
|
|
}
|
|
|
|
tsel = readb(ptd->hw_base + WPT_TSEL);
|
|
/*
|
|
* When TSEL's Policy Lock-Down bit is 1, TSEL become RO.
|
|
* If so, thermal sensor cannot enable. Bail out.
|
|
*/
|
|
if (tsel & WPT_TSEL_PLDB) {
|
|
dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
writeb(tsel|WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL);
|
|
if (!(WPT_TSS_TSDSS & readb(ptd->hw_base + WPT_TSS))) {
|
|
dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
read_trips:
|
|
ptd->crt_trip_id = -1;
|
|
trip_temp = readw(ptd->hw_base + WPT_CTT);
|
|
trip_temp &= 0x1FF;
|
|
if (trip_temp) {
|
|
/* Resolution of 1/2 degree C and an offset of -50C */
|
|
ptd->crt_temp = trip_temp * 1000 / 2 - 50000;
|
|
ptd->crt_trip_id = 0;
|
|
++(*nr_trips);
|
|
}
|
|
|
|
ptd->hot_trip_id = -1;
|
|
trip_temp = readw(ptd->hw_base + WPT_PHL);
|
|
trip_temp &= 0x1FF;
|
|
if (trip_temp) {
|
|
/* Resolution of 1/2 degree C and an offset of -50C */
|
|
ptd->hot_temp = trip_temp * 1000 / 2 - 50000;
|
|
ptd->hot_trip_id = *nr_trips;
|
|
++(*nr_trips);
|
|
}
|
|
|
|
pch_wpt_add_acpi_psv_trip(ptd, nr_trips);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pch_wpt_get_temp(struct pch_thermal_device *ptd, int *temp)
|
|
{
|
|
u8 wpt_temp;
|
|
|
|
wpt_temp = WPT_TEMP_TSR & readl(ptd->hw_base + WPT_TEMP);
|
|
|
|
/* Resolution of 1/2 degree C and an offset of -50C */
|
|
*temp = (wpt_temp * 1000 / 2 - 50000);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pch_wpt_suspend(struct pch_thermal_device *ptd)
|
|
{
|
|
u8 tsel;
|
|
|
|
if (ptd->bios_enabled)
|
|
return 0;
|
|
|
|
tsel = readb(ptd->hw_base + WPT_TSEL);
|
|
|
|
writeb(tsel & 0xFE, ptd->hw_base + WPT_TSEL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pch_wpt_resume(struct pch_thermal_device *ptd)
|
|
{
|
|
u8 tsel;
|
|
|
|
if (ptd->bios_enabled)
|
|
return 0;
|
|
|
|
tsel = readb(ptd->hw_base + WPT_TSEL);
|
|
|
|
writeb(tsel | WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct pch_dev_ops {
|
|
int (*hw_init)(struct pch_thermal_device *ptd, int *nr_trips);
|
|
int (*get_temp)(struct pch_thermal_device *ptd, int *temp);
|
|
int (*suspend)(struct pch_thermal_device *ptd);
|
|
int (*resume)(struct pch_thermal_device *ptd);
|
|
};
|
|
|
|
|
|
/* dev ops for Wildcat Point */
|
|
static const struct pch_dev_ops pch_dev_ops_wpt = {
|
|
.hw_init = pch_wpt_init,
|
|
.get_temp = pch_wpt_get_temp,
|
|
.suspend = pch_wpt_suspend,
|
|
.resume = pch_wpt_resume,
|
|
};
|
|
|
|
static int pch_thermal_get_temp(struct thermal_zone_device *tzd, int *temp)
|
|
{
|
|
struct pch_thermal_device *ptd = tzd->devdata;
|
|
|
|
return ptd->ops->get_temp(ptd, temp);
|
|
}
|
|
|
|
static int pch_get_trip_type(struct thermal_zone_device *tzd, int trip,
|
|
enum thermal_trip_type *type)
|
|
{
|
|
struct pch_thermal_device *ptd = tzd->devdata;
|
|
|
|
if (ptd->crt_trip_id == trip)
|
|
*type = THERMAL_TRIP_CRITICAL;
|
|
else if (ptd->hot_trip_id == trip)
|
|
*type = THERMAL_TRIP_HOT;
|
|
else if (ptd->psv_trip_id == trip)
|
|
*type = THERMAL_TRIP_PASSIVE;
|
|
else
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pch_get_trip_temp(struct thermal_zone_device *tzd, int trip, int *temp)
|
|
{
|
|
struct pch_thermal_device *ptd = tzd->devdata;
|
|
|
|
if (ptd->crt_trip_id == trip)
|
|
*temp = ptd->crt_temp;
|
|
else if (ptd->hot_trip_id == trip)
|
|
*temp = ptd->hot_temp;
|
|
else if (ptd->psv_trip_id == trip)
|
|
*temp = ptd->psv_temp;
|
|
else
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct thermal_zone_device_ops tzd_ops = {
|
|
.get_temp = pch_thermal_get_temp,
|
|
.get_trip_type = pch_get_trip_type,
|
|
.get_trip_temp = pch_get_trip_temp,
|
|
};
|
|
|
|
|
|
static int intel_pch_thermal_probe(struct pci_dev *pdev,
|
|
const struct pci_device_id *id)
|
|
{
|
|
struct pch_thermal_device *ptd;
|
|
int err;
|
|
int nr_trips;
|
|
char *dev_name;
|
|
|
|
ptd = devm_kzalloc(&pdev->dev, sizeof(*ptd), GFP_KERNEL);
|
|
if (!ptd)
|
|
return -ENOMEM;
|
|
|
|
switch (pdev->device) {
|
|
case PCH_THERMAL_DID_WPT:
|
|
ptd->ops = &pch_dev_ops_wpt;
|
|
dev_name = "pch_wildcat_point";
|
|
break;
|
|
case PCH_THERMAL_DID_SKL:
|
|
ptd->ops = &pch_dev_ops_wpt;
|
|
dev_name = "pch_skylake";
|
|
break;
|
|
case PCH_THERMAL_DID_HSW_1:
|
|
case PCH_THERMAL_DID_HSW_2:
|
|
ptd->ops = &pch_dev_ops_wpt;
|
|
dev_name = "pch_haswell";
|
|
break;
|
|
default:
|
|
dev_err(&pdev->dev, "unknown pch thermal device\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
pci_set_drvdata(pdev, ptd);
|
|
ptd->pdev = pdev;
|
|
|
|
err = pci_enable_device(pdev);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "failed to enable pci device\n");
|
|
return err;
|
|
}
|
|
|
|
err = pci_request_regions(pdev, driver_name);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "failed to request pci region\n");
|
|
goto error_disable;
|
|
}
|
|
|
|
ptd->hw_base = pci_ioremap_bar(pdev, 0);
|
|
if (!ptd->hw_base) {
|
|
err = -ENOMEM;
|
|
dev_err(&pdev->dev, "failed to map mem base\n");
|
|
goto error_release;
|
|
}
|
|
|
|
err = ptd->ops->hw_init(ptd, &nr_trips);
|
|
if (err)
|
|
goto error_cleanup;
|
|
|
|
ptd->tzd = thermal_zone_device_register(dev_name, nr_trips, 0, ptd,
|
|
&tzd_ops, NULL, 0, 0);
|
|
if (IS_ERR(ptd->tzd)) {
|
|
dev_err(&pdev->dev, "Failed to register thermal zone %s\n",
|
|
dev_name);
|
|
err = PTR_ERR(ptd->tzd);
|
|
goto error_cleanup;
|
|
}
|
|
|
|
return 0;
|
|
|
|
error_cleanup:
|
|
iounmap(ptd->hw_base);
|
|
error_release:
|
|
pci_release_regions(pdev);
|
|
error_disable:
|
|
pci_disable_device(pdev);
|
|
dev_err(&pdev->dev, "pci device failed to probe\n");
|
|
return err;
|
|
}
|
|
|
|
static void intel_pch_thermal_remove(struct pci_dev *pdev)
|
|
{
|
|
struct pch_thermal_device *ptd = pci_get_drvdata(pdev);
|
|
|
|
thermal_zone_device_unregister(ptd->tzd);
|
|
iounmap(ptd->hw_base);
|
|
pci_set_drvdata(pdev, NULL);
|
|
pci_release_region(pdev, 0);
|
|
pci_disable_device(pdev);
|
|
}
|
|
|
|
static int intel_pch_thermal_suspend(struct device *device)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(device);
|
|
struct pch_thermal_device *ptd = pci_get_drvdata(pdev);
|
|
|
|
return ptd->ops->suspend(ptd);
|
|
}
|
|
|
|
static int intel_pch_thermal_resume(struct device *device)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(device);
|
|
struct pch_thermal_device *ptd = pci_get_drvdata(pdev);
|
|
|
|
return ptd->ops->resume(ptd);
|
|
}
|
|
|
|
static struct pci_device_id intel_pch_thermal_id[] = {
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_WPT) },
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_SKL) },
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_HSW_1) },
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_HSW_2) },
|
|
{ 0, },
|
|
};
|
|
MODULE_DEVICE_TABLE(pci, intel_pch_thermal_id);
|
|
|
|
static const struct dev_pm_ops intel_pch_pm_ops = {
|
|
.suspend = intel_pch_thermal_suspend,
|
|
.resume = intel_pch_thermal_resume,
|
|
};
|
|
|
|
static struct pci_driver intel_pch_thermal_driver = {
|
|
.name = "intel_pch_thermal",
|
|
.id_table = intel_pch_thermal_id,
|
|
.probe = intel_pch_thermal_probe,
|
|
.remove = intel_pch_thermal_remove,
|
|
.driver.pm = &intel_pch_pm_ops,
|
|
};
|
|
|
|
module_pci_driver(intel_pch_thermal_driver);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("Intel PCH Thermal driver");
|