[linux-2.6-block.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 "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, X86_FAMILY_ANY, 0x37, 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) {
			pr_err("request_threaded_irq ret %d\n", err);
			goto error_irq;
		}
	}

	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);
error_irq:
	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>
3a2419f8	21	#include "intel_soc_dts_iosf.h"
bc40b5e3 SP	22
	23	#define CRITICAL_OFFSET_FROM_TJ_MAX 5000
	24
bc40b5e3 SP	25	static int crit_offset = CRITICAL_OFFSET_FROM_TJ_MAX;
	26	module_param(crit_offset, int, 0644);
	27	MODULE_PARM_DESC(crit_offset,
	28	"Critical Temperature offset from tj max in millidegree Celsius.");
	29
3a2419f8 SP	30	/* IRQ 86 is a fixed APIC interrupt for BYT DTS Aux threshold notifications */
3a2419f8 SP	31	#define BYT_SOC_DTS_APIC_IRQ 86
bc40b5e3	32
3a2419f8 SP	33	static int soc_dts_thres_irq;
3a2419f8 SP	34	static struct intel_soc_dts_sensors *soc_dts;
bc40b5e3 SP	35
	36	static irqreturn_t soc_irq_thread_fn(int irq, void *dev_data)
	37	{
bc40b5e3	38	pr_debug("proc_thermal_interrupt\n");
3a2419f8	39	intel_soc_dts_iosf_interrupt_handler(soc_dts);
bc40b5e3 SP	40
	41	return IRQ_HANDLED;
	42	}
	43
	44	static const struct x86_cpu_id soc_thermal_ids[] = {
	45	{ X86_VENDOR_INTEL, X86_FAMILY_ANY, 0x37, 0, BYT_SOC_DTS_APIC_IRQ},
	46	{}
	47	};
	48	MODULE_DEVICE_TABLE(x86cpu, soc_thermal_ids);
	49
	50	static int __init intel_soc_thermal_init(void)
	51	{
bc40b5e3	52	int err = 0;
bc40b5e3 SP	53	const struct x86_cpu_id *match_cpu;
	54
	55	match_cpu = x86_match_cpu(soc_thermal_ids);
	56	if (!match_cpu)
	57	return -ENODEV;
	58
3a2419f8 SP	59	/* Create a zone with 2 trips with marked as read only */
	60	soc_dts = intel_soc_dts_iosf_init(INTEL_SOC_DTS_INTERRUPT_APIC, 2, 1);
	61	if (IS_ERR(soc_dts)) {
	62	err = PTR_ERR(soc_dts);
	63	return err;
bc40b5e3 SP	64	}
bc40b5e3 SP	65
3a2419f8	66	soc_dts_thres_irq = (int)match_cpu->driver_data;
bc40b5e3	67
6c355faf SP	68	if (soc_dts_thres_irq) {
	69	err = request_threaded_irq(soc_dts_thres_irq, NULL,
	70	soc_irq_thread_fn,
	71	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	72	"soc_dts", soc_dts);
	73	if (err) {
	74	pr_err("request_threaded_irq ret %d\n", err);
3a2419f8	75	goto error_irq;
6c355faf	76	}
bc40b5e3 SP	77	}
bc40b5e3 SP	78
3a2419f8 SP	79	err = intel_soc_dts_iosf_add_read_only_critical_trip(soc_dts,
	80	crit_offset);
	81	if (err)
	82	goto error_trips;
bc40b5e3 SP	83
	84	return 0;
	85
3a2419f8	86	error_trips:
6c355faf SP	87	if (soc_dts_thres_irq)
6c355faf SP	88	free_irq(soc_dts_thres_irq, soc_dts);
3a2419f8 SP	89	error_irq:
3a2419f8 SP	90	intel_soc_dts_iosf_exit(soc_dts);
bc40b5e3 SP	91
	92	return err;
	93	}
	94
	95	static void __exit intel_soc_thermal_exit(void)
	96	{
6c355faf SP	97	if (soc_dts_thres_irq)
6c355faf SP	98	free_irq(soc_dts_thres_irq, soc_dts);
3a2419f8	99	intel_soc_dts_iosf_exit(soc_dts);
bc40b5e3 SP	100	}
	101
	102	module_init(intel_soc_thermal_init)
	103	module_exit(intel_soc_thermal_exit)
	104
	105	MODULE_DESCRIPTION("Intel SoC DTS Thermal Driver");
	106	MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
	107	MODULE_LICENSE("GPL v2");