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deb2d2ec | 1 | /* |
e2d4304b JB |
2 | * The VGA aribiter manages VGA space routing and VGA resource decode to |
3 | * allow multiple VGA devices to be used in a system in a safe way. | |
deb2d2ec BH |
4 | * |
5 | * (C) Copyright 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org> | |
6 | * (C) Copyright 2007 Paulo R. Zanoni <przanoni@gmail.com> | |
7 | * (C) Copyright 2007, 2009 Tiago Vignatti <vignatti@freedesktop.org> | |
c0db9cbc TV |
8 | * |
9 | * Permission is hereby granted, free of charge, to any person obtaining a | |
10 | * copy of this software and associated documentation files (the "Software"), | |
11 | * to deal in the Software without restriction, including without limitation | |
12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
13 | * and/or sell copies of the Software, and to permit persons to whom the | |
14 | * Software is furnished to do so, subject to the following conditions: | |
15 | * | |
16 | * The above copyright notice and this permission notice (including the next | |
17 | * paragraph) shall be included in all copies or substantial portions of the | |
18 | * Software. | |
19 | * | |
20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
23 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
25 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
26 | * DEALINGS | |
27 | * IN THE SOFTWARE. | |
28 | * | |
deb2d2ec BH |
29 | */ |
30 | ||
31 | #ifndef LINUX_VGA_H | |
a6a1a095 | 32 | #define LINUX_VGA_H |
deb2d2ec | 33 | |
1a39b310 | 34 | #include <video/vga.h> |
deb2d2ec BH |
35 | |
36 | /* Legacy VGA regions */ | |
37 | #define VGA_RSRC_NONE 0x00 | |
38 | #define VGA_RSRC_LEGACY_IO 0x01 | |
39 | #define VGA_RSRC_LEGACY_MEM 0x02 | |
40 | #define VGA_RSRC_LEGACY_MASK (VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM) | |
41 | /* Non-legacy access */ | |
42 | #define VGA_RSRC_NORMAL_IO 0x04 | |
43 | #define VGA_RSRC_NORMAL_MEM 0x08 | |
44 | ||
45 | /* Passing that instead of a pci_dev to use the system "default" | |
46 | * device, that is the one used by vgacon. Archs will probably | |
47 | * have to provide their own vga_default_device(); | |
48 | */ | |
49 | #define VGA_DEFAULT_DEVICE (NULL) | |
50 | ||
6069a4c9 RD |
51 | struct pci_dev; |
52 | ||
deb2d2ec BH |
53 | /* For use by clients */ |
54 | ||
55 | /** | |
56 | * vga_set_legacy_decoding | |
57 | * | |
58 | * @pdev: pci device of the VGA card | |
59 | * @decodes: bit mask of what legacy regions the card decodes | |
60 | * | |
61 | * Indicates to the arbiter if the card decodes legacy VGA IOs, | |
62 | * legacy VGA Memory, both, or none. All cards default to both, | |
63 | * the card driver (fbdev for example) should tell the arbiter | |
64 | * if it has disabled legacy decoding, so the card can be left | |
65 | * out of the arbitration process (and can be safe to take | |
66 | * interrupts at any time. | |
67 | */ | |
0ea18b40 | 68 | #if defined(CONFIG_VGA_ARB) |
deb2d2ec | 69 | extern void vga_set_legacy_decoding(struct pci_dev *pdev, |
7c329288 | 70 | unsigned int decodes); |
0ea18b40 AW |
71 | #else |
72 | static inline void vga_set_legacy_decoding(struct pci_dev *pdev, | |
73 | unsigned int decodes) { }; | |
74 | #endif | |
deb2d2ec | 75 | |
04cbe1de CW |
76 | #if defined(CONFIG_VGA_ARB) |
77 | extern int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible); | |
78 | #else | |
79 | static inline int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible) { return 0; } | |
80 | #endif | |
deb2d2ec BH |
81 | |
82 | /** | |
b754b35b DV |
83 | * vga_get_interruptible |
84 | * @pdev: pci device of the VGA card or NULL for the system default | |
85 | * @rsrc: bit mask of resources to acquire and lock | |
deb2d2ec | 86 | * |
b754b35b DV |
87 | * Shortcut to vga_get with interruptible set to true. |
88 | * | |
89 | * On success, release the VGA resource again with vga_put(). | |
deb2d2ec | 90 | */ |
deb2d2ec | 91 | static inline int vga_get_interruptible(struct pci_dev *pdev, |
6ac3bd52 | 92 | unsigned int rsrc) |
deb2d2ec BH |
93 | { |
94 | return vga_get(pdev, rsrc, 1); | |
95 | } | |
96 | ||
97 | /** | |
b754b35b DV |
98 | * vga_get_uninterruptible - shortcut to vga_get() |
99 | * @pdev: pci device of the VGA card or NULL for the system default | |
100 | * @rsrc: bit mask of resources to acquire and lock | |
deb2d2ec | 101 | * |
b754b35b DV |
102 | * Shortcut to vga_get with interruptible set to false. |
103 | * | |
104 | * On success, release the VGA resource again with vga_put(). | |
deb2d2ec | 105 | */ |
deb2d2ec | 106 | static inline int vga_get_uninterruptible(struct pci_dev *pdev, |
6ac3bd52 | 107 | unsigned int rsrc) |
deb2d2ec BH |
108 | { |
109 | return vga_get(pdev, rsrc, 0); | |
110 | } | |
111 | ||
04cbe1de | 112 | #if defined(CONFIG_VGA_ARB) |
deb2d2ec | 113 | extern int vga_tryget(struct pci_dev *pdev, unsigned int rsrc); |
04cbe1de CW |
114 | #else |
115 | static inline int vga_tryget(struct pci_dev *pdev, unsigned int rsrc) { return 0; } | |
116 | #endif | |
deb2d2ec | 117 | |
04cbe1de | 118 | #if defined(CONFIG_VGA_ARB) |
deb2d2ec | 119 | extern void vga_put(struct pci_dev *pdev, unsigned int rsrc); |
04cbe1de CW |
120 | #else |
121 | #define vga_put(pdev, rsrc) | |
122 | #endif | |
deb2d2ec BH |
123 | |
124 | ||
6e079d53 | 125 | #ifdef CONFIG_VGA_ARB |
deb2d2ec | 126 | extern struct pci_dev *vga_default_device(void); |
1a39b310 | 127 | extern void vga_set_default_device(struct pci_dev *pdev); |
c6b38fbb | 128 | extern int vga_remove_vgacon(struct pci_dev *pdev); |
6e079d53 MG |
129 | #else |
130 | static inline struct pci_dev *vga_default_device(void) { return NULL; }; | |
131 | static inline void vga_set_default_device(struct pci_dev *pdev) { }; | |
c6b38fbb | 132 | static inline int vga_remove_vgacon(struct pci_dev *pdev) { return 0; }; |
6e079d53 | 133 | #endif |
deb2d2ec | 134 | |
b754b35b DV |
135 | /* |
136 | * Architectures should define this if they have several | |
137 | * independent PCI domains that can afford concurrent VGA | |
138 | * decoding | |
deb2d2ec | 139 | */ |
deb2d2ec BH |
140 | #ifndef __ARCH_HAS_VGA_CONFLICT |
141 | static inline int vga_conflicts(struct pci_dev *p1, struct pci_dev *p2) | |
142 | { | |
143 | return 1; | |
144 | } | |
145 | #endif | |
146 | ||
7c329288 | 147 | #if defined(CONFIG_VGA_ARB) |
deb2d2ec BH |
148 | int vga_client_register(struct pci_dev *pdev, void *cookie, |
149 | void (*irq_set_state)(void *cookie, bool state), | |
150 | unsigned int (*set_vga_decode)(void *cookie, bool state)); | |
7c329288 IM |
151 | #else |
152 | static inline int vga_client_register(struct pci_dev *pdev, void *cookie, | |
153 | void (*irq_set_state)(void *cookie, bool state), | |
154 | unsigned int (*set_vga_decode)(void *cookie, bool state)) | |
155 | { | |
156 | return 0; | |
157 | } | |
158 | #endif | |
deb2d2ec BH |
159 | |
160 | #endif /* LINUX_VGA_H */ |