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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * intel_soc_dts_thermal.c4 * Copyright (c) 2014, Intel Corporation.5 */6 7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt8 9#include <linux/acpi.h>10#include <linux/module.h>11#include <linux/interrupt.h>12#include <asm/cpu_device_id.h>13#include <asm/intel-family.h>14#include "intel_soc_dts_iosf.h"15 16#define CRITICAL_OFFSET_FROM_TJ_MAX 500017 18static int crit_offset = CRITICAL_OFFSET_FROM_TJ_MAX;19module_param(crit_offset, int, 0644);20MODULE_PARM_DESC(crit_offset,21 "Critical Temperature offset from tj max in millidegree Celsius.");22 23/* IRQ 86 is a fixed APIC interrupt for BYT DTS Aux threshold notifications */24#define BYT_SOC_DTS_APIC_IRQ 8625 26static int soc_dts_thres_gsi;27static int soc_dts_thres_irq;28static struct intel_soc_dts_sensors *soc_dts;29 30static irqreturn_t soc_irq_thread_fn(int irq, void *dev_data)31{32 pr_debug("proc_thermal_interrupt\n");33 intel_soc_dts_iosf_interrupt_handler(soc_dts);34 35 return IRQ_HANDLED;36}37 38static const struct x86_cpu_id soc_thermal_ids[] = {39 X86_MATCH_VFM(INTEL_ATOM_SILVERMONT, BYT_SOC_DTS_APIC_IRQ),40 {}41};42MODULE_DEVICE_TABLE(x86cpu, soc_thermal_ids);43 44static int __init intel_soc_thermal_init(void)45{46 int err = 0;47 const struct x86_cpu_id *match_cpu;48 49 match_cpu = x86_match_cpu(soc_thermal_ids);50 if (!match_cpu)51 return -ENODEV;52 53 /* Create a zone with 2 trips with marked as read only */54 soc_dts = intel_soc_dts_iosf_init(INTEL_SOC_DTS_INTERRUPT_APIC, true,55 crit_offset);56 if (IS_ERR(soc_dts)) {57 err = PTR_ERR(soc_dts);58 return err;59 }60 61 soc_dts_thres_gsi = (int)match_cpu->driver_data;62 if (soc_dts_thres_gsi) {63 /*64 * Note the flags here MUST match the firmware defaults, rather65 * then the request_irq flags, otherwise we get an EBUSY error.66 */67 soc_dts_thres_irq = acpi_register_gsi(NULL, soc_dts_thres_gsi,68 ACPI_LEVEL_SENSITIVE,69 ACPI_ACTIVE_LOW);70 if (soc_dts_thres_irq < 0) {71 pr_warn("intel_soc_dts: Could not get IRQ for GSI %d, err %d\n",72 soc_dts_thres_gsi, soc_dts_thres_irq);73 soc_dts_thres_irq = 0;74 }75 }76 77 if (soc_dts_thres_irq) {78 err = request_threaded_irq(soc_dts_thres_irq, NULL,79 soc_irq_thread_fn,80 IRQF_TRIGGER_RISING | IRQF_ONESHOT,81 "soc_dts", soc_dts);82 if (err) {83 /*84 * Do not just error out because the user space thermal85 * daemon such as DPTF may use polling instead of being86 * interrupt driven.87 */88 pr_warn("request_threaded_irq ret %d\n", err);89 }90 }91 92 return 0;93}94 95static void __exit intel_soc_thermal_exit(void)96{97 if (soc_dts_thres_irq) {98 free_irq(soc_dts_thres_irq, soc_dts);99 acpi_unregister_gsi(soc_dts_thres_gsi);100 }101 intel_soc_dts_iosf_exit(soc_dts);102}103 104module_init(intel_soc_thermal_init)105module_exit(intel_soc_thermal_exit)106 107MODULE_DESCRIPTION("Intel SoC DTS Thermal Driver");108MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");109MODULE_LICENSE("GPL v2");110