@@ -285,6 +285,14 @@ config ACPI_THERMAL_REL
tristate
depends on ACPI
+config INTEL_PCH_THERMAL
+ tristate "Intel PCH Thermal Reporting Driver"
+ depends on X86 && PCI
+ help
+ Enable this to support thermal reporting on certain intel PCHs.
+ Thermal reporting device will provide temperature reading,
+ programmable trip points and other information.
+
menu "Texas Instruments thermal drivers"
source "drivers/thermal/ti-soc-thermal/Kconfig"
endmenu
@@ -39,3 +39,4 @@ obj-$(CONFIG_TI_SOC_THERMAL) += ti-soc-thermal/
obj-$(CONFIG_INT340X_THERMAL) += int340x_thermal/
obj-$(CONFIG_ST_THERMAL) += st/
obj-$(CONFIG_TEGRA_SOCTHERM) += tegra_soctherm.o
+obj-$(CONFIG_INTEL_PCH_THERMAL) += intel_pch_thermal.o
new file mode 100644
@@ -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 */
+
+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 */
+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");