1 files changed, 432 insertions, 0 deletions

diff --git a/drivers/thermal/intel/intel_pch_thermal.c b/drivers/thermal/intel/intel_pch_thermal.c
new file mode 100644
index 000000000000..8a7f69b4b022
--- /dev/null
+++ b/drivers/thermal/intel/intel_pch_thermal.c
@@ -0,0 +1,432 @@
+/* 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 */
+#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 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 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");