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>
19#include <linux/interrupt.h>
20#include <asm/cpu_device_id.h>
21#include "intel_soc_dts_iosf.h"
22
23#define CRITICAL_OFFSET_FROM_TJ_MAX	5000
24
25static int crit_offset = CRITICAL_OFFSET_FROM_TJ_MAX;
26module_param(crit_offset, int, 0644);
27MODULE_PARM_DESC(crit_offset,
28	"Critical Temperature offset from tj max in millidegree Celsius.");
29
30/* IRQ 86 is a fixed APIC interrupt for BYT DTS Aux threshold notifications */
31#define BYT_SOC_DTS_APIC_IRQ	86
32
33static int soc_dts_thres_irq;
34static struct intel_soc_dts_sensors *soc_dts;
35
36static irqreturn_t soc_irq_thread_fn(int irq, void *dev_data)
37{
38	pr_debug("proc_thermal_interrupt\n");
39	intel_soc_dts_iosf_interrupt_handler(soc_dts);
40
41	return IRQ_HANDLED;
42}
43
44static const struct x86_cpu_id soc_thermal_ids[] = {
45	{ X86_VENDOR_INTEL, X86_FAMILY_ANY, 0x37, 0, BYT_SOC_DTS_APIC_IRQ},
46	{}
47};
48MODULE_DEVICE_TABLE(x86cpu, soc_thermal_ids);
49
50static int __init intel_soc_thermal_init(void)
51{
52	int err = 0;
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
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;
64	}
65
66	soc_dts_thres_irq = (int)match_cpu->driver_data;
67
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);
75			goto error_irq;
76		}
77	}
78
79	err = intel_soc_dts_iosf_add_read_only_critical_trip(soc_dts,
80							     crit_offset);
81	if (err)
82		goto error_trips;
83
84	return 0;
85
86error_trips:
87	if (soc_dts_thres_irq)
88		free_irq(soc_dts_thres_irq, soc_dts);
89error_irq:
90	intel_soc_dts_iosf_exit(soc_dts);
91
92	return err;
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	intel_soc_dts_iosf_exit(soc_dts);
100}
101
102module_init(intel_soc_thermal_init)
103module_exit(intel_soc_thermal_exit)
104
105MODULE_DESCRIPTION("Intel SoC DTS Thermal Driver");
106MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
107MODULE_LICENSE("GPL v2");
108