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author | Tushar Dave <tushar.n.dave@intel.com> | 2015-06-10 13:34:24 -0700 |
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committer | Zhang Rui <rui.zhang@intel.com> | 2015-08-04 10:06:08 +0800 |
commit | d0a12625d2ff2c63321b3cf48c48184748ab577a (patch) | |
tree | 62862e5ff7093cd72f4e64f4d318a76067468fb6 /drivers/thermal/intel_pch_thermal.c | |
parent | 1f22dc4494e203d6987fc708f414b4adf8614036 (diff) | |
download | linux-stable-d0a12625d2ff2c63321b3cf48c48184748ab577a.tar.gz linux-stable-d0a12625d2ff2c63321b3cf48c48184748ab577a.tar.bz2 linux-stable-d0a12625d2ff2c63321b3cf48c48184748ab577a.zip |
thermal: Add Intel PCH thermal driver
This change adds a thermal driver for Wildcat Point platform controller
hub. This driver register PCH thermal sensor as a thermal zone and
associate critical and hot trips if present.
Signed-off-by: Tushar Dave <tushar.n.dave@intel.com>
Reviewed-by: Pandruvada, Srinivas <srinivas.pandruvada@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Diffstat (limited to 'drivers/thermal/intel_pch_thermal.c')
-rw-r--r-- | drivers/thermal/intel_pch_thermal.c | 286 |
1 files changed, 286 insertions, 0 deletions
diff --git a/drivers/thermal/intel_pch_thermal.c b/drivers/thermal/intel_pch_thermal.c new file mode 100644 index 000000000000..1650a62484bd --- /dev/null +++ b/drivers/thermal/intel_pch_thermal.c @@ -0,0 +1,286 @@ +/* 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/thermal.h> + +/* Intel PCH thermal Device IDs */ +#define PCH_THERMAL_DID_WPT 0x9CA4 /* Wildcat Point */ + +/* 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; +}; + +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)) + 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); + } + + return 0; +} + +static int pch_wpt_get_temp(struct pch_thermal_device *ptd, + unsigned long *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; +} + +struct pch_dev_ops { + int (*hw_init)(struct pch_thermal_device *ptd, int *nr_trips); + int (*get_temp)(struct pch_thermal_device *ptd, unsigned long *temp); +}; + + +/* dev ops for Wildcat Point */ +static struct pch_dev_ops pch_dev_ops_wpt = { + .hw_init = pch_wpt_init, + .get_temp = pch_wpt_get_temp, +}; + +static int pch_thermal_get_temp(struct thermal_zone_device *tzd, + unsigned long *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 + return -EINVAL; + + return 0; +} + +static int pch_get_trip_temp(struct thermal_zone_device *tzd, int trip, + unsigned long *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 + 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; + 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 struct pci_device_id intel_pch_thermal_id[] = { + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_WPT) }, + { 0, }, +}; +MODULE_DEVICE_TABLE(pci, intel_pch_thermal_id); + +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, +}; + +module_pci_driver(intel_pch_thermal_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Intel PCH Thermal driver"); |