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Tushar Davezhang-rui
Tushar Dave
authored and
zhang-rui
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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>
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‎drivers/thermal/Kconfig

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@@ -340,6 +340,14 @@ config ACPI_THERMAL_REL
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tristate
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depends on ACPI
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config INTEL_PCH_THERMAL
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tristate "Intel PCH Thermal Reporting Driver"
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depends on X86 && PCI
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help
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Enable this to support thermal reporting on certain intel PCHs.
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Thermal reporting device will provide temperature reading,
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programmable trip points and other information.
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menu "Texas Instruments thermal drivers"
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source "drivers/thermal/ti-soc-thermal/Kconfig"
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endmenu

‎drivers/thermal/Makefile

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@@ -41,6 +41,7 @@ obj-$(CONFIG_INTEL_SOC_DTS_THERMAL) += intel_soc_dts_thermal.o
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obj-$(CONFIG_INTEL_QUARK_DTS_THERMAL) += intel_quark_dts_thermal.o
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obj-$(CONFIG_TI_SOC_THERMAL) += ti-soc-thermal/
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obj-$(CONFIG_INT340X_THERMAL) += int340x_thermal/
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obj-$(CONFIG_INTEL_PCH_THERMAL) += intel_pch_thermal.o
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obj-$(CONFIG_ST_THERMAL) += st/
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obj-$(CONFIG_TEGRA_SOCTHERM) += tegra_soctherm.o
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obj-$(CONFIG_HISI_THERMAL) += hisi_thermal.o

‎drivers/thermal/intel_pch_thermal.c

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/* intel_pch_thermal.c - Intel PCH Thermal driver
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*
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* Copyright (c) 2015, Intel Corporation.
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*
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* Authors:
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* Tushar Dave <tushar.n.dave@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/thermal.h>
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/* Intel PCH thermal Device IDs */
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#define PCH_THERMAL_DID_WPT 0x9CA4 /* Wildcat Point */
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/* Wildcat Point-LP PCH Thermal registers */
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#define WPT_TEMP 0x0000 /* Temperature */
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#define WPT_TSC 0x04 /* Thermal Sensor Control */
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#define WPT_TSS 0x06 /* Thermal Sensor Status */
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#define WPT_TSEL 0x08 /* Thermal Sensor Enable and Lock */
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#define WPT_TSREL 0x0A /* Thermal Sensor Report Enable and Lock */
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#define WPT_TSMIC 0x0C /* Thermal Sensor SMI Control */
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#define WPT_CTT 0x0010 /* Catastrophic Trip Point */
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#define WPT_TAHV 0x0014 /* Thermal Alert High Value */
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#define WPT_TALV 0x0018 /* Thermal Alert Low Value */
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#define WPT_TL 0x00000040 /* Throttle Value */
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#define WPT_PHL 0x0060 /* PCH Hot Level */
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#define WPT_PHLC 0x62 /* PHL Control */
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#define WPT_TAS 0x80 /* Thermal Alert Status */
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#define WPT_TSPIEN 0x82 /* PCI Interrupt Event Enables */
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#define WPT_TSGPEN 0x84 /* General Purpose Event Enables */
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/* Wildcat Point-LP PCH Thermal Register bit definitions */
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#define WPT_TEMP_TSR 0x00ff /* Temp TS Reading */
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#define WPT_TSC_CPDE 0x01 /* Catastrophic Power-Down Enable */
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#define WPT_TSS_TSDSS 0x10 /* Thermal Sensor Dynamic Shutdown Status */
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#define WPT_TSS_GPES 0x08 /* GPE status */
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#define WPT_TSEL_ETS 0x01 /* Enable TS */
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#define WPT_TSEL_PLDB 0x80 /* TSEL Policy Lock-Down Bit */
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#define WPT_TL_TOL 0x000001FF /* T0 Level */
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#define WPT_TL_T1L 0x1ff00000 /* T1 Level */
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#define WPT_TL_TTEN 0x20000000 /* TT Enable */
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static char driver_name[] = "Intel PCH thermal driver";
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struct pch_thermal_device {
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void __iomem *hw_base;
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const struct pch_dev_ops *ops;
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struct pci_dev *pdev;
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struct thermal_zone_device *tzd;
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int crt_trip_id;
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unsigned long crt_temp;
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int hot_trip_id;
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unsigned long hot_temp;
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};
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static int pch_wpt_init(struct pch_thermal_device *ptd, int *nr_trips)
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{
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u8 tsel;
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u16 trip_temp;
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*nr_trips = 0;
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/* Check if BIOS has already enabled thermal sensor */
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if (WPT_TSS_TSDSS & readb(ptd->hw_base + WPT_TSS))
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goto read_trips;
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tsel = readb(ptd->hw_base + WPT_TSEL);
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/*
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* When TSEL's Policy Lock-Down bit is 1, TSEL become RO.
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* If so, thermal sensor cannot enable. Bail out.
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*/
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if (tsel & WPT_TSEL_PLDB) {
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dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
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return -ENODEV;
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}
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writeb(tsel|WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL);
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if (!(WPT_TSS_TSDSS & readb(ptd->hw_base + WPT_TSS))) {
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dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
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return -ENODEV;
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}
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read_trips:
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ptd->crt_trip_id = -1;
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trip_temp = readw(ptd->hw_base + WPT_CTT);
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trip_temp &= 0x1FF;
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if (trip_temp) {
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/* Resolution of 1/2 degree C and an offset of -50C */
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ptd->crt_temp = trip_temp * 1000 / 2 - 50000;
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ptd->crt_trip_id = 0;
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++(*nr_trips);
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}
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ptd->hot_trip_id = -1;
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trip_temp = readw(ptd->hw_base + WPT_PHL);
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trip_temp &= 0x1FF;
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if (trip_temp) {
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/* Resolution of 1/2 degree C and an offset of -50C */
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ptd->hot_temp = trip_temp * 1000 / 2 - 50000;
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ptd->hot_trip_id = *nr_trips;
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++(*nr_trips);
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}
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return 0;
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}
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static int pch_wpt_get_temp(struct pch_thermal_device *ptd,
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unsigned long *temp)
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{
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u8 wpt_temp;
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wpt_temp = WPT_TEMP_TSR & readl(ptd->hw_base + WPT_TEMP);
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/* Resolution of 1/2 degree C and an offset of -50C */
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*temp = (wpt_temp * 1000 / 2 - 50000);
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return 0;
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}
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struct pch_dev_ops {
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int (*hw_init)(struct pch_thermal_device *ptd, int *nr_trips);
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int (*get_temp)(struct pch_thermal_device *ptd, unsigned long *temp);
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};
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/* dev ops for Wildcat Point */
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static struct pch_dev_ops pch_dev_ops_wpt = {
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.hw_init = pch_wpt_init,
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.get_temp = pch_wpt_get_temp,
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};
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static int pch_thermal_get_temp(struct thermal_zone_device *tzd,
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unsigned long *temp)
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{
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struct pch_thermal_device *ptd = tzd->devdata;
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return ptd->ops->get_temp(ptd, temp);
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}
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static int pch_get_trip_type(struct thermal_zone_device *tzd, int trip,
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enum thermal_trip_type *type)
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{
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struct pch_thermal_device *ptd = tzd->devdata;
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if (ptd->crt_trip_id == trip)
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*type = THERMAL_TRIP_CRITICAL;
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else if (ptd->hot_trip_id == trip)
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*type = THERMAL_TRIP_HOT;
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else
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return -EINVAL;
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return 0;
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}
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static int pch_get_trip_temp(struct thermal_zone_device *tzd, int trip,
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unsigned long *temp)
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{
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struct pch_thermal_device *ptd = tzd->devdata;
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if (ptd->crt_trip_id == trip)
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*temp = ptd->crt_temp;
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else if (ptd->hot_trip_id == trip)
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*temp = ptd->hot_temp;
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else
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return -EINVAL;
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return 0;
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}
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static struct thermal_zone_device_ops tzd_ops = {
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.get_temp = pch_thermal_get_temp,
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.get_trip_type = pch_get_trip_type,
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.get_trip_temp = pch_get_trip_temp,
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};
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static int intel_pch_thermal_probe(struct pci_dev *pdev,
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const struct pci_device_id *id)
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{
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struct pch_thermal_device *ptd;
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int err;
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int nr_trips;
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char *dev_name;
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ptd = devm_kzalloc(&pdev->dev, sizeof(*ptd), GFP_KERNEL);
199+
if (!ptd)
200+
return -ENOMEM;
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switch (pdev->device) {
203+
case PCH_THERMAL_DID_WPT:
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ptd->ops = &pch_dev_ops_wpt;
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dev_name = "pch_wildcat_point";
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break;
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default:
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dev_err(&pdev->dev, "unknown pch thermal device\n");
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return -ENODEV;
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}
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pci_set_drvdata(pdev, ptd);
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ptd->pdev = pdev;
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err = pci_enable_device(pdev);
216+
if (err) {
217+
dev_err(&pdev->dev, "failed to enable pci device\n");
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return err;
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}
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err = pci_request_regions(pdev, driver_name);
222+
if (err) {
223+
dev_err(&pdev->dev, "failed to request pci region\n");
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goto error_disable;
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}
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ptd->hw_base = pci_ioremap_bar(pdev, 0);
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if (!ptd->hw_base) {
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err = -ENOMEM;
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dev_err(&pdev->dev, "failed to map mem base\n");
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goto error_release;
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}
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err = ptd->ops->hw_init(ptd, &nr_trips);
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if (err)
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goto error_cleanup;
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ptd->tzd = thermal_zone_device_register(dev_name, nr_trips, 0, ptd,
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&tzd_ops, NULL, 0, 0);
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if (IS_ERR(ptd->tzd)) {
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dev_err(&pdev->dev, "Failed to register thermal zone %s\n",
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dev_name);
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err = PTR_ERR(ptd->tzd);
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goto error_cleanup;
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}
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return 0;
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error_cleanup:
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iounmap(ptd->hw_base);
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error_release:
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pci_release_regions(pdev);
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error_disable:
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pci_disable_device(pdev);
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dev_err(&pdev->dev, "pci device failed to probe\n");
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return err;
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}
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static void intel_pch_thermal_remove(struct pci_dev *pdev)
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{
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struct pch_thermal_device *ptd = pci_get_drvdata(pdev);
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thermal_zone_device_unregister(ptd->tzd);
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iounmap(ptd->hw_base);
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pci_set_drvdata(pdev, NULL);
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pci_release_region(pdev, 0);
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pci_disable_device(pdev);
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}
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static struct pci_device_id intel_pch_thermal_id[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_WPT) },
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{ 0, },
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};
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MODULE_DEVICE_TABLE(pci, intel_pch_thermal_id);
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static struct pci_driver intel_pch_thermal_driver = {
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.name = "intel_pch_thermal",
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.id_table = intel_pch_thermal_id,
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.probe = intel_pch_thermal_probe,
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.remove = intel_pch_thermal_remove,
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};
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module_pci_driver(intel_pch_thermal_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Intel PCH Thermal driver");

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