| // SPDX-License-Identifier: GPL-2.0-only |
| /* intel_pch_thermal.c - Intel PCH Thermal driver |
| * |
| * Copyright (c) 2015, Intel Corporation. |
| * |
| * Authors: |
| * Tushar Dave <tushar.n.dave@intel.com> |
| */ |
| |
| #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 */ |
| #define PCH_THERMAL_DID_SKL_H 0xA131 /* Skylake PCH 100 series */ |
| #define PCH_THERMAL_DID_CNL 0x9Df9 /* CNL PCH */ |
| #define PCH_THERMAL_DID_CNL_H 0xA379 /* CNL-H 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 0x01ff /* 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_TSEL_ETS & readb(ptd->hw_base + WPT_TSEL)) { |
| 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_TSEL_ETS & readb(ptd->hw_base + WPT_TSEL))) { |
| 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) |
| { |
| u16 wpt_temp; |
| |
| wpt_temp = WPT_TEMP_TSR & readw(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, |
| }; |
| |
| enum board_ids { |
| board_hsw, |
| board_wpt, |
| board_skl, |
| board_cnl, |
| }; |
| |
| static const struct board_info { |
| const char *name; |
| const struct pch_dev_ops *ops; |
| } board_info[] = { |
| [board_hsw] = { |
| .name = "pch_haswell", |
| .ops = &pch_dev_ops_wpt, |
| }, |
| [board_wpt] = { |
| .name = "pch_wildcat_point", |
| .ops = &pch_dev_ops_wpt, |
| }, |
| [board_skl] = { |
| .name = "pch_skylake", |
| .ops = &pch_dev_ops_wpt, |
| }, |
| [board_cnl] = { |
| .name = "pch_cannonlake", |
| .ops = &pch_dev_ops_wpt, |
| }, |
| }; |
| |
| static int intel_pch_thermal_probe(struct pci_dev *pdev, |
| const struct pci_device_id *id) |
| { |
| enum board_ids board_id = id->driver_data; |
| const struct board_info *bi = &board_info[board_id]; |
| struct pch_thermal_device *ptd; |
| int err; |
| int nr_trips; |
| |
| ptd = devm_kzalloc(&pdev->dev, sizeof(*ptd), GFP_KERNEL); |
| if (!ptd) |
| return -ENOMEM; |
| |
| ptd->ops = bi->ops; |
| |
| 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(bi->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", |
| bi->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 pch_thermal_device *ptd = dev_get_drvdata(device); |
| |
| return ptd->ops->suspend(ptd); |
| } |
| |
| static int intel_pch_thermal_resume(struct device *device) |
| { |
| struct pch_thermal_device *ptd = dev_get_drvdata(device); |
| |
| return ptd->ops->resume(ptd); |
| } |
| |
| static const struct pci_device_id intel_pch_thermal_id[] = { |
| { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_HSW_1), |
| .driver_data = board_hsw, }, |
| { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_HSW_2), |
| .driver_data = board_hsw, }, |
| { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_WPT), |
| .driver_data = board_wpt, }, |
| { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_SKL), |
| .driver_data = board_skl, }, |
| { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_SKL_H), |
| .driver_data = board_skl, }, |
| { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_CNL), |
| .driver_data = board_cnl, }, |
| { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_CNL_H), |
| .driver_data = board_cnl, }, |
| { 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"); |