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122 lines
3.1 KiB
122 lines
3.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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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#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_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT, 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 <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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