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
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
30 /* IRQ 86 is a fixed APIC interrupt for BYT DTS Aux threshold notifications */
31 #define BYT_SOC_DTS_APIC_IRQ 86
32
33 static int soc_dts_thres_irq;
34 static struct intel_soc_dts_sensors *soc_dts;
35
soc_irq_thread_fn(int irq,void * dev_data)36 static 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
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
intel_soc_thermal_init(void)50 static 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
86 error_trips:
87 if (soc_dts_thres_irq)
88 free_irq(soc_dts_thres_irq, soc_dts);
89 error_irq:
90 intel_soc_dts_iosf_exit(soc_dts);
91
92 return err;
93 }
94
intel_soc_thermal_exit(void)95 static 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
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");
108