68b2440b2a
The interrupt request call in Intel SoC DTS driver may fail if there is no underlying BIOS support. However, the user space thermal daemon can still use the thermal zones created by the SoC DTS driver in polling mode, therefore, instead of bailing out on interrupt request failures, it is better just to log a warning message and continue the init process. Signed-off-by: Brian Bian <brian.bian@intel.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
113 lines
2.9 KiB
C
113 lines
2.9 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/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_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_SILVERMONT1, 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_irq = (int)match_cpu->driver_data;
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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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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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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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