1/*
2 * linux/include/video/vga.h -- standard VGA chipset interaction
3 *
4 * Copyright 1999 Jeff Garzik <jgarzik@pobox.com>
5 *
6 * Copyright history from vga16fb.c:
7 * Copyright 1999 Ben Pfaff and Petr Vandrovec
8 * Based on VGA info at http://www.osdever.net/FreeVGA/home.htm
9 * Based on VESA framebuffer (c) 1998 Gerd Knorr
10 *
11 * This file is subject to the terms and conditions of the GNU General
12 * Public License. See the file COPYING in the main directory of this
13 * archive for more details.
14 *
15 */
16
17#ifndef HW_VGA_REGS_H
18#define HW_VGA_REGS_H
19
20/* Some of the code below is taken from SVGAlib. The original,
21 unmodified copyright notice for that code is below. */
22/* VGAlib version 1.2 - (c) 1993 Tommy Frandsen */
23/* */
24/* This library is free software; you can redistribute it and/or */
25/* modify it without any restrictions. This library is distributed */
26/* in the hope that it will be useful, but without any warranty. */
27
28/* Multi-chipset support Copyright 1993 Harm Hanemaayer */
29/* partially copyrighted (C) 1993 by Hartmut Schirmer */
30
31/* VGA data register ports */
32#define VGA_CRT_DC 0x3D5 /* CRT Controller Data Register - color emulation */
33#define VGA_CRT_DM 0x3B5 /* CRT Controller Data Register - mono emulation */
34#define VGA_ATT_R 0x3C1 /* Attribute Controller Data Read Register */
35#define VGA_ATT_W 0x3C0 /* Attribute Controller Data Write Register */
36#define VGA_GFX_D 0x3CF /* Graphics Controller Data Register */
37#define VGA_SEQ_D 0x3C5 /* Sequencer Data Register */
38#define VGA_MIS_R 0x3CC /* Misc Output Read Register */
39#define VGA_MIS_W 0x3C2 /* Misc Output Write Register */
40#define VGA_FTC_R 0x3CA /* Feature Control Read Register */
41#define VGA_IS1_RC 0x3DA /* Input Status Register 1 - color emulation */
42#define VGA_IS1_RM 0x3BA /* Input Status Register 1 - mono emulation */
43#define VGA_PEL_D 0x3C9 /* PEL Data Register */
44#define VGA_PEL_MSK 0x3C6 /* PEL mask register */
45
46/* EGA-specific registers */
47#define EGA_GFX_E0 0x3CC /* Graphics enable processor 0 */
48#define EGA_GFX_E1 0x3CA /* Graphics enable processor 1 */
49
50/* VGA index register ports */
51#define VGA_CRT_IC 0x3D4 /* CRT Controller Index - color emulation */
52#define VGA_CRT_IM 0x3B4 /* CRT Controller Index - mono emulation */
53#define VGA_ATT_IW 0x3C0 /* Attribute Controller Index & Data Write Register */
54#define VGA_GFX_I 0x3CE /* Graphics Controller Index */
55#define VGA_SEQ_I 0x3C4 /* Sequencer Index */
56#define VGA_PEL_IW 0x3C8 /* PEL Write Index */
57#define VGA_PEL_IR 0x3C7 /* PEL Read Index */
58
59/* standard VGA indexes max counts */
60#define VGA_CRT_C 0x19 /* Number of CRT Controller Registers */
61#define VGA_ATT_C 0x15 /* Number of Attribute Controller Registers */
62#define VGA_GFX_C 0x09 /* Number of Graphics Controller Registers */
63#define VGA_SEQ_C 0x05 /* Number of Sequencer Registers */
64#define VGA_MIS_C 0x01 /* Number of Misc Output Register */
65
66/* VGA misc register bit masks */
67#define VGA_MIS_COLOR 0x01
68#define VGA_MIS_ENB_MEM_ACCESS 0x02
69#define VGA_MIS_DCLK_28322_720 0x04
70#define VGA_MIS_ENB_PLL_LOAD (0x04 | 0x08)
71#define VGA_MIS_SEL_HIGH_PAGE 0x20
72
73/* VGA CRT controller register indices */
74#define VGA_CRTC_H_TOTAL 0
75#define VGA_CRTC_H_DISP 1
76#define VGA_CRTC_H_BLANK_START 2
77#define VGA_CRTC_H_BLANK_END 3
78#define VGA_CRTC_H_SYNC_START 4
79#define VGA_CRTC_H_SYNC_END 5
80#define VGA_CRTC_V_TOTAL 6
81#define VGA_CRTC_OVERFLOW 7
82#define VGA_CRTC_PRESET_ROW 8
83#define VGA_CRTC_MAX_SCAN 9
84#define VGA_CRTC_CURSOR_START 0x0A
85#define VGA_CRTC_CURSOR_END 0x0B
86#define VGA_CRTC_START_HI 0x0C
87#define VGA_CRTC_START_LO 0x0D
88#define VGA_CRTC_CURSOR_HI 0x0E
89#define VGA_CRTC_CURSOR_LO 0x0F
90#define VGA_CRTC_V_SYNC_START 0x10
91#define VGA_CRTC_V_SYNC_END 0x11
92#define VGA_CRTC_V_DISP_END 0x12
93#define VGA_CRTC_OFFSET 0x13
94#define VGA_CRTC_UNDERLINE 0x14
95#define VGA_CRTC_V_BLANK_START 0x15
96#define VGA_CRTC_V_BLANK_END 0x16
97#define VGA_CRTC_MODE 0x17
98#define VGA_CRTC_LINE_COMPARE 0x18
99#define VGA_CRTC_REGS VGA_CRT_C
100
101/* VGA CRT controller bit masks */
102#define VGA_CR11_LOCK_CR0_CR7 0x80 /* lock writes to CR0 - CR7 */
103#define VGA_CR17_H_V_SIGNALS_ENABLED 0x80
104
105/* VGA attribute controller register indices */
106#define VGA_ATC_PALETTE0 0x00
107#define VGA_ATC_PALETTE1 0x01
108#define VGA_ATC_PALETTE2 0x02
109#define VGA_ATC_PALETTE3 0x03
110#define VGA_ATC_PALETTE4 0x04
111#define VGA_ATC_PALETTE5 0x05
112#define VGA_ATC_PALETTE6 0x06
113#define VGA_ATC_PALETTE7 0x07
114#define VGA_ATC_PALETTE8 0x08
115#define VGA_ATC_PALETTE9 0x09
116#define VGA_ATC_PALETTEA 0x0A
117#define VGA_ATC_PALETTEB 0x0B
118#define VGA_ATC_PALETTEC 0x0C
119#define VGA_ATC_PALETTED 0x0D
120#define VGA_ATC_PALETTEE 0x0E
121#define VGA_ATC_PALETTEF 0x0F
122#define VGA_ATC_MODE 0x10
123#define VGA_ATC_OVERSCAN 0x11
124#define VGA_ATC_PLANE_ENABLE 0x12
125#define VGA_ATC_PEL 0x13
126#define VGA_ATC_COLOR_PAGE 0x14
127
128#define VGA_AR_ENABLE_DISPLAY 0x20
129
130/* VGA sequencer register indices */
131#define VGA_SEQ_RESET 0x00
132#define VGA_SEQ_CLOCK_MODE 0x01
133#define VGA_SEQ_PLANE_WRITE 0x02
134#define VGA_SEQ_CHARACTER_MAP 0x03
135#define VGA_SEQ_MEMORY_MODE 0x04
136
137/* VGA sequencer register bit masks */
138#define VGA_SR01_CHAR_CLK_8DOTS 0x01 /* bit 0: character clocks 8 dots wide are generated */
139#define VGA_SR01_SCREEN_OFF 0x20 /* bit 5: Screen is off */
140#define VGA_SR02_ALL_PLANES 0x0F /* bits 3-0: enable access to all planes */
141#define VGA_SR04_EXT_MEM 0x02 /* bit 1: allows complete mem access to 256K */
142#define VGA_SR04_SEQ_MODE 0x04 /* bit 2: directs system to use a sequential addressing mode */
143#define VGA_SR04_CHN_4M 0x08 /* bit 3: selects modulo 4 addressing for CPU access to display memory */
144
145/* VGA graphics controller register indices */
146#define VGA_GFX_SR_VALUE 0x00
147#define VGA_GFX_SR_ENABLE 0x01
148#define VGA_GFX_COMPARE_VALUE 0x02
149#define VGA_GFX_DATA_ROTATE 0x03
150#define VGA_GFX_PLANE_READ 0x04
151#define VGA_GFX_MODE 0x05
152#define VGA_GFX_MISC 0x06
153#define VGA_GFX_COMPARE_MASK 0x07
154#define VGA_GFX_BIT_MASK 0x08
155
156/* VGA graphics controller bit masks */
157#define VGA_GR06_GRAPHICS_MODE 0x01
158
159#endif /* HW_VGA_REGS_H */
160