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02158453 SJ |
1 | /* SPDX-License-Identifier: MIT */ |
2 | ||
deb2d2ec | 3 | /* |
e2d4304b JB |
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. | |
deb2d2ec BH |
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 | |
a6a1a095 | 13 | #define LINUX_VGA_H |
deb2d2ec | 14 | |
1a39b310 | 15 | #include <video/vga.h> |
deb2d2ec | 16 | |
6609176f CH |
17 | struct pci_dev; |
18 | ||
deb2d2ec BH |
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 | ||
6609176f CH |
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); | |
bf44e8ce CH |
35 | int vga_client_register(struct pci_dev *pdev, |
36 | unsigned int (*set_decode)(struct pci_dev *pdev, bool state)); | |
6609176f | 37 | #else /* CONFIG_VGA_ARB */ |
0ea18b40 | 38 | static inline void vga_set_legacy_decoding(struct pci_dev *pdev, |
6609176f CH |
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 | } | |
bf44e8ce CH |
61 | static inline int vga_client_register(struct pci_dev *pdev, |
62 | unsigned int (*set_decode)(struct pci_dev *pdev, bool state)) | |
6609176f CH |
63 | { |
64 | return 0; | |
65 | } | |
66 | #endif /* CONFIG_VGA_ARB */ | |
deb2d2ec BH |
67 | |
68 | /** | |
b754b35b DV |
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 | |
deb2d2ec | 72 | * |
b754b35b DV |
73 | * Shortcut to vga_get with interruptible set to true. |
74 | * | |
75 | * On success, release the VGA resource again with vga_put(). | |
deb2d2ec | 76 | */ |
deb2d2ec | 77 | static inline int vga_get_interruptible(struct pci_dev *pdev, |
6ac3bd52 | 78 | unsigned int rsrc) |
deb2d2ec | 79 | { |
cc64ca4b | 80 | return vga_get(pdev, rsrc, 1); |
deb2d2ec BH |
81 | } |
82 | ||
83 | /** | |
b754b35b DV |
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 | |
deb2d2ec | 87 | * |
b754b35b DV |
88 | * Shortcut to vga_get with interruptible set to false. |
89 | * | |
90 | * On success, release the VGA resource again with vga_put(). | |
deb2d2ec | 91 | */ |
deb2d2ec | 92 | static inline int vga_get_uninterruptible(struct pci_dev *pdev, |
6ac3bd52 | 93 | unsigned int rsrc) |
deb2d2ec | 94 | { |
cc64ca4b | 95 | return vga_get(pdev, rsrc, 0); |
deb2d2ec BH |
96 | } |
97 | ||
b8779475 CH |
98 | static inline void vga_client_unregister(struct pci_dev *pdev) |
99 | { | |
bf44e8ce | 100 | vga_client_register(pdev, NULL); |
b8779475 CH |
101 | } |
102 | ||
deb2d2ec | 103 | #endif /* LINUX_VGA_H */ |