133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
/*
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* intel_soc_dts_thermal.c
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* Copyright (c) 2014, Intel Corporation.
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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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/acpi.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <asm/cpu_device_id.h>
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#include <asm/intel-family.h>
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#include "intel_soc_dts_iosf.h"
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#define CRITICAL_OFFSET_FROM_TJ_MAX 5000
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static int crit_offset = CRITICAL_OFFSET_FROM_TJ_MAX;
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module_param(crit_offset, int, 0644);
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MODULE_PARM_DESC(crit_offset,
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"Critical Temperature offset from tj max in millidegree Celsius.");
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/* IRQ 86 is a fixed APIC interrupt for BYT DTS Aux threshold notifications */
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#define BYT_SOC_DTS_APIC_IRQ 86
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static int soc_dts_thres_gsi;
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static int soc_dts_thres_irq;
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static struct intel_soc_dts_sensors *soc_dts;
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static irqreturn_t soc_irq_thread_fn(int irq, void *dev_data)
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{
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pr_debug("proc_thermal_interrupt\n");
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intel_soc_dts_iosf_interrupt_handler(soc_dts);
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return IRQ_HANDLED;
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}
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static const struct x86_cpu_id soc_thermal_ids[] = {
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{ X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SILVERMONT, 0,
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BYT_SOC_DTS_APIC_IRQ},
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{}
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};
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MODULE_DEVICE_TABLE(x86cpu, soc_thermal_ids);
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static int __init intel_soc_thermal_init(void)
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{
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int err = 0;
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const struct x86_cpu_id *match_cpu;
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match_cpu = x86_match_cpu(soc_thermal_ids);
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if (!match_cpu)
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return -ENODEV;
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/* Create a zone with 2 trips with marked as read only */
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soc_dts = intel_soc_dts_iosf_init(INTEL_SOC_DTS_INTERRUPT_APIC, 2, 1);
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if (IS_ERR(soc_dts)) {
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err = PTR_ERR(soc_dts);
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return err;
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}
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soc_dts_thres_gsi = (int)match_cpu->driver_data;
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if (soc_dts_thres_gsi) {
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/*
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* Note the flags here MUST match the firmware defaults, rather
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* then the request_irq flags, otherwise we get an EBUSY error.
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*/
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soc_dts_thres_irq = acpi_register_gsi(NULL, soc_dts_thres_gsi,
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ACPI_LEVEL_SENSITIVE,
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ACPI_ACTIVE_LOW);
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if (soc_dts_thres_irq < 0) {
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pr_warn("intel_soc_dts: Could not get IRQ for GSI %d, err %d\n",
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soc_dts_thres_gsi, soc_dts_thres_irq);
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soc_dts_thres_irq = 0;
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}
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}
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if (soc_dts_thres_irq) {
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err = request_threaded_irq(soc_dts_thres_irq, NULL,
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soc_irq_thread_fn,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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"soc_dts", soc_dts);
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if (err) {
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/*
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* Do not just error out because the user space thermal
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* daemon such as DPTF may use polling instead of being
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* interrupt driven.
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*/
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pr_warn("request_threaded_irq ret %d\n", err);
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}
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}
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err = intel_soc_dts_iosf_add_read_only_critical_trip(soc_dts,
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crit_offset);
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if (err)
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goto error_trips;
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return 0;
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error_trips:
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if (soc_dts_thres_irq) {
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free_irq(soc_dts_thres_irq, soc_dts);
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acpi_unregister_gsi(soc_dts_thres_gsi);
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}
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intel_soc_dts_iosf_exit(soc_dts);
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return err;
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}
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static void __exit intel_soc_thermal_exit(void)
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{
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if (soc_dts_thres_irq) {
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free_irq(soc_dts_thres_irq, soc_dts);
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acpi_unregister_gsi(soc_dts_thres_gsi);
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}
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intel_soc_dts_iosf_exit(soc_dts);
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}
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module_init(intel_soc_thermal_init)
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module_exit(intel_soc_thermal_exit)
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MODULE_DESCRIPTION("Intel SoC DTS Thermal Driver");
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MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
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MODULE_LICENSE("GPL v2");
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