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1/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * ACPI PCI Hot Plug Controller Driver
4 *
5 * Copyright (C) 1995,2001 Compaq Computer Corporation
6 * Copyright (C) 2001 Greg Kroah-Hartman ([email protected])
7 * Copyright (C) 2001 IBM Corp.
8 * Copyright (C) 2002 Hiroshi Aono ([email protected])
9 * Copyright (C) 2002,2003 Takayoshi Kochi ([email protected])
10 * Copyright (C) 2002,2003 NEC Corporation
11 * Copyright (C) 2003-2005 Matthew Wilcox ([email protected])
12 * Copyright (C) 2003-2005 Hewlett Packard
13 *
14 * All rights reserved.
15 *
16 * Send feedback to <[email protected]>,
17 * <[email protected]>
18 *
19 */
20
21#ifndef _ACPIPHP_H
22#define _ACPIPHP_H
23
24#include <linux/acpi.h>
25#include <linux/mutex.h>
26#include <linux/pci_hotplug.h>
27
28struct acpiphp_context;
29struct acpiphp_bridge;
30struct acpiphp_slot;
31
32/*
33 * struct slot - slot information for each *physical* slot
34 */
35struct slot {
36 struct hotplug_slot hotplug_slot;
37 struct acpiphp_slot *acpi_slot;
38 unsigned int sun; /* ACPI _SUN (Slot User Number) value */
39};
40
41static inline const char *slot_name(struct slot *slot)
42{
43 return hotplug_slot_name(&slot->hotplug_slot);
44}
45
46static inline struct slot *to_slot(struct hotplug_slot *hotplug_slot)
47{
48 return container_of(hotplug_slot, struct slot, hotplug_slot);
49}
50
51/*
52 * struct acpiphp_bridge - PCI bridge information
53 *
54 * for each bridge device in ACPI namespace
55 */
56struct acpiphp_bridge {
57 struct list_head list;
58 struct list_head slots;
59 struct kref ref;
60
61 struct acpiphp_context *context;
62
63 int nr_slots;
64
65 /* This bus (host bridge) or Secondary bus (PCI-to-PCI bridge) */
66 struct pci_bus *pci_bus;
67
68 /* PCI-to-PCI bridge device */
69 struct pci_dev *pci_dev;
70
71 bool is_going_away;
72};
73
74
75/*
76 * struct acpiphp_slot - PCI slot information
77 *
78 * PCI slot information for each *physical* PCI slot
79 */
80struct acpiphp_slot {
81 struct list_head node;
82 struct pci_bus *bus;
83 struct list_head funcs; /* one slot may have different
84 objects (i.e. for each function) */
85 struct slot *slot;
86
87 u8 device; /* pci device# */
88 u32 flags; /* see below */
89};
90
91
92/*
93 * struct acpiphp_func - PCI function information
94 *
95 * PCI function information for each object in ACPI namespace
96 * typically 8 objects per slot (i.e. for each PCI function)
97 */
98struct acpiphp_func {
99 struct acpiphp_bridge *parent;
100 struct acpiphp_slot *slot;
101
102 struct list_head sibling;
103
104 u8 function; /* pci function# */
105 u32 flags; /* see below */
106};
107
108struct acpiphp_context {
109 struct acpi_hotplug_context hp;
110 struct acpiphp_func func;
111 struct acpiphp_bridge *bridge;
112 unsigned int refcount;
113};
114
115static inline struct acpiphp_context *to_acpiphp_context(struct acpi_hotplug_context *hp)
116{
117 return container_of(hp, struct acpiphp_context, hp);
118}
119
120static inline struct acpiphp_context *func_to_context(struct acpiphp_func *func)
121{
122 return container_of(func, struct acpiphp_context, func);
123}
124
125static inline struct acpi_device *func_to_acpi_device(struct acpiphp_func *func)
126{
127 return func_to_context(func)->hp.self;
128}
129
130static inline acpi_handle func_to_handle(struct acpiphp_func *func)
131{
132 return func_to_acpi_device(func)->handle;
133}
134
135struct acpiphp_root_context {
136 struct acpi_hotplug_context hp;
137 struct acpiphp_bridge *root_bridge;
138};
139
140static inline struct acpiphp_root_context *to_acpiphp_root_context(struct acpi_hotplug_context *hp)
141{
142 return container_of(hp, struct acpiphp_root_context, hp);
143}
144
145/*
146 * struct acpiphp_attention_info - device specific attention registration
147 *
148 * ACPI has no generic method of setting/getting attention status
149 * this allows for device specific driver registration
150 */
151struct acpiphp_attention_info {
152 int (*set_attn)(struct hotplug_slot *slot, u8 status);
153 int (*get_attn)(struct hotplug_slot *slot, u8 *status);
154 struct module *owner;
155};
156
157/* ACPI _STA method value (ignore bit 4; battery present) */
158#define ACPI_STA_ALL (0x0000000f)
159
160/* slot flags */
161
162#define SLOT_ENABLED (0x00000001)
163#define SLOT_IS_GOING_AWAY (0x00000002)
164
165/* function flags */
166
167#define FUNC_HAS_STA (0x00000001)
168#define FUNC_HAS_EJ0 (0x00000002)
169
170/* function prototypes */
171
172/* acpiphp_core.c */
173int acpiphp_register_attention(struct acpiphp_attention_info *info);
174int acpiphp_unregister_attention(struct acpiphp_attention_info *info);
175int acpiphp_register_hotplug_slot(struct acpiphp_slot *slot, unsigned int sun);
176void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *slot);
177
178int acpiphp_enable_slot(struct acpiphp_slot *slot);
179int acpiphp_disable_slot(struct acpiphp_slot *slot);
180u8 acpiphp_get_power_status(struct acpiphp_slot *slot);
181u8 acpiphp_get_latch_status(struct acpiphp_slot *slot);
182u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot);
183
184/* variables */
185extern bool acpiphp_disabled;
186
187#endif /* _ACPIPHP_H */