1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * intel_soc_dts_thermal.c |
4 | * Copyright (c) 2014, Intel Corporation. |
5 | */ |
6 | |
7 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
8 | |
9 | #include <linux/acpi.h> |
10 | #include <linux/module.h> |
11 | #include <linux/interrupt.h> |
12 | #include <asm/cpu_device_id.h> |
13 | #include <asm/intel-family.h> |
14 | #include "intel_soc_dts_iosf.h" |
15 | |
16 | #define CRITICAL_OFFSET_FROM_TJ_MAX 5000 |
17 | |
18 | static int crit_offset = CRITICAL_OFFSET_FROM_TJ_MAX; |
19 | module_param(crit_offset, int, 0644); |
20 | MODULE_PARM_DESC(crit_offset, |
21 | "Critical Temperature offset from tj max in millidegree Celsius." ); |
22 | |
23 | /* IRQ 86 is a fixed APIC interrupt for BYT DTS Aux threshold notifications */ |
24 | #define BYT_SOC_DTS_APIC_IRQ 86 |
25 | |
26 | static int soc_dts_thres_gsi; |
27 | static int soc_dts_thres_irq; |
28 | static struct intel_soc_dts_sensors *soc_dts; |
29 | |
30 | static irqreturn_t soc_irq_thread_fn(int irq, void *dev_data) |
31 | { |
32 | pr_debug("proc_thermal_interrupt\n" ); |
33 | intel_soc_dts_iosf_interrupt_handler(sensors: soc_dts); |
34 | |
35 | return IRQ_HANDLED; |
36 | } |
37 | |
38 | static const struct x86_cpu_id soc_thermal_ids[] = { |
39 | X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT, BYT_SOC_DTS_APIC_IRQ), |
40 | {} |
41 | }; |
42 | MODULE_DEVICE_TABLE(x86cpu, soc_thermal_ids); |
43 | |
44 | static int __init intel_soc_thermal_init(void) |
45 | { |
46 | int err = 0; |
47 | const struct x86_cpu_id *match_cpu; |
48 | |
49 | match_cpu = x86_match_cpu(match: soc_thermal_ids); |
50 | if (!match_cpu) |
51 | return -ENODEV; |
52 | |
53 | /* Create a zone with 2 trips with marked as read only */ |
54 | soc_dts = intel_soc_dts_iosf_init(intr_type: INTEL_SOC_DTS_INTERRUPT_APIC, critical_trip: true, |
55 | crit_offset); |
56 | if (IS_ERR(ptr: soc_dts)) { |
57 | err = PTR_ERR(ptr: soc_dts); |
58 | return err; |
59 | } |
60 | |
61 | soc_dts_thres_gsi = (int)match_cpu->driver_data; |
62 | if (soc_dts_thres_gsi) { |
63 | /* |
64 | * Note the flags here MUST match the firmware defaults, rather |
65 | * then the request_irq flags, otherwise we get an EBUSY error. |
66 | */ |
67 | soc_dts_thres_irq = acpi_register_gsi(NULL, gsi: soc_dts_thres_gsi, |
68 | ACPI_LEVEL_SENSITIVE, |
69 | ACPI_ACTIVE_LOW); |
70 | if (soc_dts_thres_irq < 0) { |
71 | pr_warn("intel_soc_dts: Could not get IRQ for GSI %d, err %d\n" , |
72 | soc_dts_thres_gsi, soc_dts_thres_irq); |
73 | soc_dts_thres_irq = 0; |
74 | } |
75 | } |
76 | |
77 | if (soc_dts_thres_irq) { |
78 | err = request_threaded_irq(irq: soc_dts_thres_irq, NULL, |
79 | thread_fn: soc_irq_thread_fn, |
80 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, |
81 | name: "soc_dts" , dev: soc_dts); |
82 | if (err) { |
83 | /* |
84 | * Do not just error out because the user space thermal |
85 | * daemon such as DPTF may use polling instead of being |
86 | * interrupt driven. |
87 | */ |
88 | pr_warn("request_threaded_irq ret %d\n" , err); |
89 | } |
90 | } |
91 | |
92 | return 0; |
93 | } |
94 | |
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 | acpi_unregister_gsi(gsi: soc_dts_thres_gsi); |
100 | } |
101 | intel_soc_dts_iosf_exit(sensors: soc_dts); |
102 | } |
103 | |
104 | module_init(intel_soc_thermal_init) |
105 | module_exit(intel_soc_thermal_exit) |
106 | |
107 | MODULE_DESCRIPTION("Intel SoC DTS Thermal Driver" ); |
108 | MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>" ); |
109 | MODULE_LICENSE("GPL v2" ); |
110 | |