1 /* SPDX-License-Identifier: MIT */
2
3 /*
4 * The VGA aribiter manages VGA space routing and VGA resource decode to
5 * allow multiple VGA devices to be used in a system in a safe way.
6 *
7 * (C) Copyright 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>
8 * (C) Copyright 2007 Paulo R. Zanoni <przanoni@gmail.com>
9 * (C) Copyright 2007, 2009 Tiago Vignatti <vignatti@freedesktop.org>
10 */
11
12 #ifndef LINUX_VGA_H
13 #define LINUX_VGA_H
14
15 #include <video/vga.h>
16
17 struct pci_dev;
18
19 /* Legacy VGA regions */
20 #define VGA_RSRC_NONE 0x00
21 #define VGA_RSRC_LEGACY_IO 0x01
22 #define VGA_RSRC_LEGACY_MEM 0x02
23 #define VGA_RSRC_LEGACY_MASK (VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM)
24 /* Non-legacy access */
25 #define VGA_RSRC_NORMAL_IO 0x04
26 #define VGA_RSRC_NORMAL_MEM 0x08
27
28 #ifdef CONFIG_VGA_ARB
29 void vga_set_legacy_decoding(struct pci_dev *pdev, unsigned int decodes);
30 int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible);
31 void vga_put(struct pci_dev *pdev, unsigned int rsrc);
32 struct pci_dev *vga_default_device(void);
33 void vga_set_default_device(struct pci_dev *pdev);
34 int vga_remove_vgacon(struct pci_dev *pdev);
35 int vga_client_register(struct pci_dev *pdev,
36 unsigned int (*set_decode)(struct pci_dev *pdev, bool state));
37 #else /* CONFIG_VGA_ARB */
38 static inline void vga_set_legacy_decoding(struct pci_dev *pdev,
39 unsigned int decodes)
40 {
41 };
42 static inline int vga_get(struct pci_dev *pdev, unsigned int rsrc,
43 int interruptible)
44 {
45 return 0;
46 }
47 static inline void vga_put(struct pci_dev *pdev, unsigned int rsrc)
48 {
49 }
50 static inline struct pci_dev *vga_default_device(void)
51 {
52 return NULL;
53 }
54 static inline void vga_set_default_device(struct pci_dev *pdev)
55 {
56 }
57 static inline int vga_remove_vgacon(struct pci_dev *pdev)
58 {
59 return 0;
60 }
61 static inline int vga_client_register(struct pci_dev *pdev,
62 unsigned int (*set_decode)(struct pci_dev *pdev, bool state))
63 {
64 return 0;
65 }
66 #endif /* CONFIG_VGA_ARB */
67
68 /**
69 * vga_get_interruptible
70 * @pdev: pci device of the VGA card or NULL for the system default
71 * @rsrc: bit mask of resources to acquire and lock
72 *
73 * Shortcut to vga_get with interruptible set to true.
74 *
75 * On success, release the VGA resource again with vga_put().
76 */
77 static inline int vga_get_interruptible(struct pci_dev *pdev,
78 unsigned int rsrc)
79 {
80 return vga_get(pdev, rsrc, 1);
81 }
82
83 /**
84 * vga_get_uninterruptible - shortcut to vga_get()
85 * @pdev: pci device of the VGA card or NULL for the system default
86 * @rsrc: bit mask of resources to acquire and lock
87 *
88 * Shortcut to vga_get with interruptible set to false.
89 *
90 * On success, release the VGA resource again with vga_put().
91 */
92 static inline int vga_get_uninterruptible(struct pci_dev *pdev,
93 unsigned int rsrc)
94 {
95 return vga_get(pdev, rsrc, 0);
96 }
97
98 static inline void vga_client_unregister(struct pci_dev *pdev)
99 {
100 vga_client_register(pdev, NULL);
101 }
102
103 #endif /* LINUX_VGA_H */
104
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