[mirror_ubuntu-bionic-kernel.git] / drivers / thermal / intel_soc_dts_thermal.c

/*
 * intel_soc_dts_thermal.c
 * Copyright (c) 2014, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#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_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_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SILVERMONT, 0,
		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_irq = (int)match_cpu->driver_data;

	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);
	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);
	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");
Commit	Line	Data
bc40b5e3 SP	1	/*
	2	* intel_soc_dts_thermal.c
	3	* Copyright (c) 2014, Intel Corporation.
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms and conditions of the GNU General Public License,
	7	* version 2, as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	* more details.
	13	*
	14	*/
	15
	16	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	17
	18	#include <linux/module.h>
bc40b5e3	19	#include <linux/interrupt.h>
bc40b5e3	20	#include <asm/cpu_device_id.h>
ce53da02	21	#include <asm/intel-family.h>
3a2419f8	22	#include "intel_soc_dts_iosf.h"
bc40b5e3 SP	23
	24	#define CRITICAL_OFFSET_FROM_TJ_MAX 5000
	25
bc40b5e3 SP	26	static int crit_offset = CRITICAL_OFFSET_FROM_TJ_MAX;
	27	module_param(crit_offset, int, 0644);
	28	MODULE_PARM_DESC(crit_offset,
	29	"Critical Temperature offset from tj max in millidegree Celsius.");
	30
3a2419f8 SP	31	/* IRQ 86 is a fixed APIC interrupt for BYT DTS Aux threshold notifications */
3a2419f8 SP	32	#define BYT_SOC_DTS_APIC_IRQ 86
bc40b5e3	33
3a2419f8 SP	34	static int soc_dts_thres_irq;
3a2419f8 SP	35	static struct intel_soc_dts_sensors *soc_dts;
bc40b5e3 SP	36
	37	static irqreturn_t soc_irq_thread_fn(int irq, void *dev_data)
	38	{
bc40b5e3	39	pr_debug("proc_thermal_interrupt\n");
3a2419f8	40	intel_soc_dts_iosf_interrupt_handler(soc_dts);
bc40b5e3 SP	41
	42	return IRQ_HANDLED;
	43	}
	44
	45	static const struct x86_cpu_id soc_thermal_ids[] = {
2811e5d5	46	{ X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SILVERMONT, 0,
ce53da02	47	BYT_SOC_DTS_APIC_IRQ},
bc40b5e3 SP	48	{}
	49	};
	50	MODULE_DEVICE_TABLE(x86cpu, soc_thermal_ids);
	51
	52	static int __init intel_soc_thermal_init(void)
	53	{
bc40b5e3	54	int err = 0;
bc40b5e3 SP	55	const struct x86_cpu_id *match_cpu;
	56
	57	match_cpu = x86_match_cpu(soc_thermal_ids);
	58	if (!match_cpu)
	59	return -ENODEV;
	60
3a2419f8 SP	61	/* Create a zone with 2 trips with marked as read only */
	62	soc_dts = intel_soc_dts_iosf_init(INTEL_SOC_DTS_INTERRUPT_APIC, 2, 1);
	63	if (IS_ERR(soc_dts)) {
	64	err = PTR_ERR(soc_dts);
	65	return err;
bc40b5e3 SP	66	}
bc40b5e3 SP	67
3a2419f8	68	soc_dts_thres_irq = (int)match_cpu->driver_data;
bc40b5e3	69
6c355faf SP	70	if (soc_dts_thres_irq) {
	71	err = request_threaded_irq(soc_dts_thres_irq, NULL,
	72	soc_irq_thread_fn,
	73	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	74	"soc_dts", soc_dts);
	75	if (err) {
68b2440b BB	76	/*
	77	* Do not just error out because the user space thermal
	78	* daemon such as DPTF may use polling instead of being
	79	* interrupt driven.
	80	*/
	81	pr_warn("request_threaded_irq ret %d\n", err);
6c355faf	82	}
bc40b5e3 SP	83	}
bc40b5e3 SP	84
3a2419f8 SP	85	err = intel_soc_dts_iosf_add_read_only_critical_trip(soc_dts,
	86	crit_offset);
	87	if (err)
	88	goto error_trips;
bc40b5e3 SP	89
	90	return 0;
	91
3a2419f8	92	error_trips:
6c355faf SP	93	if (soc_dts_thres_irq)
6c355faf SP	94	free_irq(soc_dts_thres_irq, soc_dts);
3a2419f8	95	intel_soc_dts_iosf_exit(soc_dts);
bc40b5e3 SP	96
	97	return err;
	98	}
	99
	100	static void __exit intel_soc_thermal_exit(void)
	101	{
6c355faf SP	102	if (soc_dts_thres_irq)
6c355faf SP	103	free_irq(soc_dts_thres_irq, soc_dts);
3a2419f8	104	intel_soc_dts_iosf_exit(soc_dts);
bc40b5e3 SP	105	}
	106
	107	module_init(intel_soc_thermal_init)
	108	module_exit(intel_soc_thermal_exit)
	109
	110	MODULE_DESCRIPTION("Intel SoC DTS Thermal Driver");
	111	MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
	112	MODULE_LICENSE("GPL v2");