123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-only
|
||
|
|
/*
|
||
|
|
* intel_soc_dts_thermal.c
|
||
|
|
* Copyright (c) 2014, Intel Corporation.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
||
|
|
|
||
|
|
#include <linux/acpi.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/interrupt.h>
|
||
|
|
#include <asm/cpu_device_id.h>
|
||
|
|
#include <asm/intel-family.h>
|
||
|
|
#include "intel_soc_dts_iosf.h"
|
||
|
|
|
||
|
|
#define CRITICAL_OFFSET_FROM_TJ_MAX 5000
|
||
|
|
|
||
|
|
static int crit_offset = CRITICAL_OFFSET_FROM_TJ_MAX;
|
||
|
|
module_param(crit_offset, int, 0644);
|
||
|
|
MODULE_PARM_DESC(crit_offset,
|
||
|
|
"Critical Temperature offset from tj max in millidegree Celsius.");
|
||
|
|
|
||
|
|
/* IRQ 86 is a fixed APIC interrupt for BYT DTS Aux threshold notifications */
|
||
|
|
#define BYT_SOC_DTS_APIC_IRQ 86
|
||
|
|
|
||
|
|
static int soc_dts_thres_gsi;
|
||
|
|
static int soc_dts_thres_irq;
|
||
|
|
static struct intel_soc_dts_sensors *soc_dts;
|
||
|
|
|
||
|
|
static irqreturn_t soc_irq_thread_fn(int irq, void *dev_data)
|
||
|
|
{
|
||
|
|
pr_debug("proc_thermal_interrupt\n");
|
||
|
|
intel_soc_dts_iosf_interrupt_handler(soc_dts);
|
||
|
|
|
||
|
|
return IRQ_HANDLED;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct x86_cpu_id soc_thermal_ids[] = {
|
||
|
|
X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT, BYT_SOC_DTS_APIC_IRQ),
|
||
|
|
{}
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(x86cpu, soc_thermal_ids);
|
||
|
|
|
||
|
|
static int __init intel_soc_thermal_init(void)
|
||
|
|
{
|
||
|
|
int err = 0;
|
||
|
|
const struct x86_cpu_id *match_cpu;
|
||
|
|
|
||
|
|
match_cpu = x86_match_cpu(soc_thermal_ids);
|
||
|
|
if (!match_cpu)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
/* Create a zone with 2 trips with marked as read only */
|
||
|
|
soc_dts = intel_soc_dts_iosf_init(INTEL_SOC_DTS_INTERRUPT_APIC, 2, 1);
|
||
|
|
if (IS_ERR(soc_dts)) {
|
||
|
|
err = PTR_ERR(soc_dts);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
soc_dts_thres_gsi = (int)match_cpu->driver_data;
|
||
|
|
if (soc_dts_thres_gsi) {
|
||
|
|
/*
|
||
|
|
* Note the flags here MUST match the firmware defaults, rather
|
||
|
|
* then the request_irq flags, otherwise we get an EBUSY error.
|
||
|
|
*/
|
||
|
|
soc_dts_thres_irq = acpi_register_gsi(NULL, soc_dts_thres_gsi,
|
||
|
|
ACPI_LEVEL_SENSITIVE,
|
||
|
|
ACPI_ACTIVE_LOW);
|
||
|
|
if (soc_dts_thres_irq < 0) {
|
||
|
|
pr_warn("intel_soc_dts: Could not get IRQ for GSI %d, err %d\n",
|
||
|
|
soc_dts_thres_gsi, soc_dts_thres_irq);
|
||
|
|
soc_dts_thres_irq = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (soc_dts_thres_irq) {
|
||
|
|
err = request_threaded_irq(soc_dts_thres_irq, NULL,
|
||
|
|
soc_irq_thread_fn,
|
||
|
|
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
|
||
|
|
"soc_dts", soc_dts);
|
||
|
|
if (err) {
|
||
|
|
/*
|
||
|
|
* Do not just error out because the user space thermal
|
||
|
|
* daemon such as DPTF may use polling instead of being
|
||
|
|
* interrupt driven.
|
||
|
|
*/
|
||
|
|
pr_warn("request_threaded_irq ret %d\n", err);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
err = intel_soc_dts_iosf_add_read_only_critical_trip(soc_dts,
|
||
|
|
crit_offset);
|
||
|
|
if (err)
|
||
|
|
goto error_trips;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
error_trips:
|
||
|
|
if (soc_dts_thres_irq) {
|
||
|
|
free_irq(soc_dts_thres_irq, soc_dts);
|
||
|
|
acpi_unregister_gsi(soc_dts_thres_gsi);
|
||
|
|
}
|
||
|
|
intel_soc_dts_iosf_exit(soc_dts);
|
||
|
|
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit intel_soc_thermal_exit(void)
|
||
|
|
{
|
||
|
|
if (soc_dts_thres_irq) {
|
||
|
|
free_irq(soc_dts_thres_irq, soc_dts);
|
||
|
|
acpi_unregister_gsi(soc_dts_thres_gsi);
|
||
|
|
}
|
||
|
|
intel_soc_dts_iosf_exit(soc_dts);
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(intel_soc_thermal_init)
|
||
|
|
module_exit(intel_soc_thermal_exit)
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("Intel SoC DTS Thermal Driver");
|
||
|
|
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
|
||
|
|
MODULE_LICENSE("GPL v2");
|