File: /usr/src/linux/drivers/video/vga.h
1 /*
2 * linux/include/video/vga.h -- standard VGA chipset interaction
3 *
4 * Copyright 1999 Jeff Garzik <jgarzik@mandrakesoft.com>
5 *
6 * Copyright history from vga16fb.c:
7 * Copyright 1999 Ben Pfaff and Petr Vandrovec
8 * Based on VGA info at http://www.goodnet.com/~tinara/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 __linux_video_vga_h__
18 #define __linux_video_vga_h__
19
20 #include <linux/config.h>
21 #include <linux/types.h>
22 #include <asm/io.h>
23 #ifndef CONFIG_AMIGA
24 #include <asm/vga.h>
25 #endif
26 #include <asm/byteorder.h>
27
28
29 /* Some of the code below is taken from SVGAlib. The original,
30 unmodified copyright notice for that code is below. */
31 /* VGAlib version 1.2 - (c) 1993 Tommy Frandsen */
32 /* */
33 /* This library is free software; you can redistribute it and/or */
34 /* modify it without any restrictions. This library is distributed */
35 /* in the hope that it will be useful, but without any warranty. */
36
37 /* Multi-chipset support Copyright 1993 Harm Hanemaayer */
38 /* partially copyrighted (C) 1993 by Hartmut Schirmer */
39
40 /* VGA data register ports */
41 #define VGA_CRT_DC 0x3D5 /* CRT Controller Data Register - color emulation */
42 #define VGA_CRT_DM 0x3B5 /* CRT Controller Data Register - mono emulation */
43 #define VGA_ATT_R 0x3C1 /* Attribute Controller Data Read Register */
44 #define VGA_ATT_W 0x3C0 /* Attribute Controller Data Write Register */
45 #define VGA_GFX_D 0x3CF /* Graphics Controller Data Register */
46 #define VGA_SEQ_D 0x3C5 /* Sequencer Data Register */
47 #define VGA_MIS_R 0x3CC /* Misc Output Read Register */
48 #define VGA_MIS_W 0x3C2 /* Misc Output Write Register */
49 #define VGA_FTC_R 0x3CA /* Feature Control Read Register */
50 #define VGA_IS1_RC 0x3DA /* Input Status Register 1 - color emulation */
51 #define VGA_IS1_RM 0x3BA /* Input Status Register 1 - mono emulation */
52 #define VGA_PEL_D 0x3C9 /* PEL Data Register */
53 #define VGA_PEL_MSK 0x3C6 /* PEL mask register */
54
55 /* EGA-specific registers */
56 #define EGA_GFX_E0 0x3CC /* Graphics enable processor 0 */
57 #define EGA_GFX_E1 0x3CA /* Graphics enable processor 1 */
58
59 /* VGA index register ports */
60 #define VGA_CRT_IC 0x3D4 /* CRT Controller Index - color emulation */
61 #define VGA_CRT_IM 0x3B4 /* CRT Controller Index - mono emulation */
62 #define VGA_ATT_IW 0x3C0 /* Attribute Controller Index & Data Write Register */
63 #define VGA_GFX_I 0x3CE /* Graphics Controller Index */
64 #define VGA_SEQ_I 0x3C4 /* Sequencer Index */
65 #define VGA_PEL_IW 0x3C8 /* PEL Write Index */
66 #define VGA_PEL_IR 0x3C7 /* PEL Read Index */
67
68 /* standard VGA indexes max counts */
69 #define VGA_CRT_C 0x19 /* Number of CRT Controller Registers */
70 #define VGA_ATT_C 0x15 /* Number of Attribute Controller Registers */
71 #define VGA_GFX_C 0x09 /* Number of Graphics Controller Registers */
72 #define VGA_SEQ_C 0x05 /* Number of Sequencer Registers */
73 #define VGA_MIS_C 0x01 /* Number of Misc Output Register */
74
75 /* VGA misc register bit masks */
76 #define VGA_MIS_COLOR 0x01
77 #define VGA_MIS_ENB_MEM_ACCESS 0x02
78 #define VGA_MIS_DCLK_28322_720 0x04
79 #define VGA_MIS_ENB_PLL_LOAD (0x04 | 0x08)
80 #define VGA_MIS_SEL_HIGH_PAGE 0x20
81
82 /* VGA CRT controller register indices */
83 #define VGA_CRTC_H_TOTAL 0
84 #define VGA_CRTC_H_DISP 1
85 #define VGA_CRTC_H_BLANK_START 2
86 #define VGA_CRTC_H_BLANK_END 3
87 #define VGA_CRTC_H_SYNC_START 4
88 #define VGA_CRTC_H_SYNC_END 5
89 #define VGA_CRTC_V_TOTAL 6
90 #define VGA_CRTC_OVERFLOW 7
91 #define VGA_CRTC_PRESET_ROW 8
92 #define VGA_CRTC_MAX_SCAN 9
93 #define VGA_CRTC_CURSOR_START 0x0A
94 #define VGA_CRTC_CURSOR_END 0x0B
95 #define VGA_CRTC_START_HI 0x0C
96 #define VGA_CRTC_START_LO 0x0D
97 #define VGA_CRTC_CURSOR_HI 0x0E
98 #define VGA_CRTC_CURSOR_LO 0x0F
99 #define VGA_CRTC_V_SYNC_START 0x10
100 #define VGA_CRTC_V_SYNC_END 0x11
101 #define VGA_CRTC_V_DISP_END 0x12
102 #define VGA_CRTC_OFFSET 0x13
103 #define VGA_CRTC_UNDERLINE 0x14
104 #define VGA_CRTC_V_BLANK_START 0x15
105 #define VGA_CRTC_V_BLANK_END 0x16
106 #define VGA_CRTC_MODE 0x17
107 #define VGA_CRTC_LINE_COMPARE 0x18
108 #define VGA_CRTC_REGS VGA_CRT_C
109
110 /* VGA CRT controller bit masks */
111 #define VGA_CR11_LOCK_CR0_CR7 0x80 /* lock writes to CR0 - CR7 */
112 #define VGA_CR17_H_V_SIGNALS_ENABLED 0x80
113
114 /* VGA attribute controller register indices */
115 #define VGA_ATC_PALETTE0 0x00
116 #define VGA_ATC_PALETTE1 0x01
117 #define VGA_ATC_PALETTE2 0x02
118 #define VGA_ATC_PALETTE3 0x03
119 #define VGA_ATC_PALETTE4 0x04
120 #define VGA_ATC_PALETTE5 0x05
121 #define VGA_ATC_PALETTE6 0x06
122 #define VGA_ATC_PALETTE7 0x07
123 #define VGA_ATC_PALETTE8 0x08
124 #define VGA_ATC_PALETTE9 0x09
125 #define VGA_ATC_PALETTEA 0x0A
126 #define VGA_ATC_PALETTEB 0x0B
127 #define VGA_ATC_PALETTEC 0x0C
128 #define VGA_ATC_PALETTED 0x0D
129 #define VGA_ATC_PALETTEE 0x0E
130 #define VGA_ATC_PALETTEF 0x0F
131 #define VGA_ATC_MODE 0x10
132 #define VGA_ATC_OVERSCAN 0x11
133 #define VGA_ATC_PLANE_ENABLE 0x12
134 #define VGA_ATC_PEL 0x13
135 #define VGA_ATC_COLOR_PAGE 0x14
136
137 #define VGA_AR_ENABLE_DISPLAY 0x20
138
139 /* VGA sequencer register indices */
140 #define VGA_SEQ_RESET 0x00
141 #define VGA_SEQ_CLOCK_MODE 0x01
142 #define VGA_SEQ_PLANE_WRITE 0x02
143 #define VGA_SEQ_CHARACTER_MAP 0x03
144 #define VGA_SEQ_MEMORY_MODE 0x04
145
146 /* VGA sequencer register bit masks */
147 #define VGA_SR01_CHAR_CLK_8DOTS 0x01 /* bit 0: character clocks 8 dots wide are generated */
148 #define VGA_SR01_SCREEN_OFF 0x20 /* bit 5: Screen is off */
149 #define VGA_SR02_ALL_PLANES 0x0F /* bits 3-0: enable access to all planes */
150 #define VGA_SR04_EXT_MEM 0x02 /* bit 1: allows complete mem access to 256K */
151 #define VGA_SR04_SEQ_MODE 0x04 /* bit 2: directs system to use a sequential addressing mode */
152 #define VGA_SR04_CHN_4M 0x08 /* bit 3: selects modulo 4 addressing for CPU access to display memory */
153
154 /* VGA graphics controller register indices */
155 #define VGA_GFX_SR_VALUE 0x00
156 #define VGA_GFX_SR_ENABLE 0x01
157 #define VGA_GFX_COMPARE_VALUE 0x02
158 #define VGA_GFX_DATA_ROTATE 0x03
159 #define VGA_GFX_PLANE_READ 0x04
160 #define VGA_GFX_MODE 0x05
161 #define VGA_GFX_MISC 0x06
162 #define VGA_GFX_COMPARE_MASK 0x07
163 #define VGA_GFX_BIT_MASK 0x08
164
165 /* VGA graphics controller bit masks */
166 #define VGA_GR06_GRAPHICS_MODE 0x01
167
168 /* macro for composing an 8-bit VGA register index and value
169 * into a single 16-bit quantity */
170 #define VGA_OUT16VAL(v, r) (((v) << 8) | (r))
171
172 /* decide whether we should enable the faster 16-bit VGA register writes */
173 #ifdef __LITTLE_ENDIAN
174 #define VGA_OUTW_WRITE
175 #endif
176
177
178 /*
179 * generic VGA port read/write
180 */
181
182 static inline unsigned char vga_io_r (unsigned short port)
183 {
184 return inb (port);
185 }
186
187 static inline void vga_io_w (unsigned short port, unsigned char val)
188 {
189 outb (val, port);
190 }
191
192 static inline void vga_io_w_fast (unsigned short port, unsigned char reg,
193 unsigned char val)
194 {
195 outw (VGA_OUT16VAL (val, reg), port);
196 }
197
198 static inline unsigned char vga_mm_r (caddr_t regbase, unsigned short port)
199 {
200 return readb (regbase + port);
201 }
202
203 static inline void vga_mm_w (caddr_t regbase, unsigned short port, unsigned char val)
204 {
205 writeb (val, regbase + port);
206 }
207
208 static inline void vga_mm_w_fast (caddr_t regbase, unsigned short port,
209 unsigned char reg, unsigned char val)
210 {
211 writew (VGA_OUT16VAL (val, reg), regbase + port);
212 }
213
214 static inline unsigned char vga_r (caddr_t regbase, unsigned short port)
215 {
216 if (regbase)
217 return vga_mm_r (regbase, port);
218 else
219 return vga_io_r (port);
220 }
221
222 static inline void vga_w (caddr_t regbase, unsigned short port, unsigned char val)
223 {
224 if (regbase)
225 vga_mm_w (regbase, port, val);
226 else
227 vga_io_w (port, val);
228 }
229
230
231 static inline void vga_w_fast (caddr_t regbase, unsigned short port,
232 unsigned char reg, unsigned char val)
233 {
234 if (regbase)
235 vga_mm_w_fast (regbase, port, reg, val);
236 else
237 vga_io_w_fast (port, reg, val);
238 }
239
240
241 /*
242 * VGA CRTC register read/write
243 */
244
245 static inline unsigned char vga_rcrt (caddr_t regbase, unsigned char reg)
246 {
247 vga_w (regbase, VGA_CRT_IC, reg);
248 return vga_r (regbase, VGA_CRT_DC);
249 }
250
251 static inline void vga_wcrt (caddr_t regbase, unsigned char reg, unsigned char val)
252 {
253 #ifdef VGA_OUTW_WRITE
254 vga_w_fast (regbase, VGA_CRT_IC, reg, val);
255 #else
256 vga_w (regbase, VGA_CRT_IC, reg);
257 vga_w (regbase, VGA_CRT_DC, val);
258 #endif /* VGA_OUTW_WRITE */
259 }
260
261 static inline unsigned char vga_io_rcrt (unsigned char reg)
262 {
263 vga_io_w (VGA_CRT_IC, reg);
264 return vga_io_r (VGA_CRT_DC);
265 }
266
267 static inline void vga_io_wcrt (unsigned char reg, unsigned char val)
268 {
269 #ifdef VGA_OUTW_WRITE
270 vga_io_w_fast (VGA_CRT_IC, reg, val);
271 #else
272 vga_io_w (VGA_CRT_IC, reg);
273 vga_io_w (VGA_CRT_DC, val);
274 #endif /* VGA_OUTW_WRITE */
275 }
276
277 static inline unsigned char vga_mm_rcrt (caddr_t regbase, unsigned char reg)
278 {
279 vga_mm_w (regbase, VGA_CRT_IC, reg);
280 return vga_mm_r (regbase, VGA_CRT_DC);
281 }
282
283 static inline void vga_mm_wcrt (caddr_t regbase, unsigned char reg, unsigned char val)
284 {
285 #ifdef VGA_OUTW_WRITE
286 vga_mm_w_fast (regbase, VGA_CRT_IC, reg, val);
287 #else
288 vga_mm_w (regbase, VGA_CRT_IC, reg);
289 vga_mm_w (regbase, VGA_CRT_DC, val);
290 #endif /* VGA_OUTW_WRITE */
291 }
292
293
294 /*
295 * VGA sequencer register read/write
296 */
297
298 static inline unsigned char vga_rseq (caddr_t regbase, unsigned char reg)
299 {
300 vga_w (regbase, VGA_SEQ_I, reg);
301 return vga_r (regbase, VGA_SEQ_D);
302 }
303
304 static inline void vga_wseq (caddr_t regbase, unsigned char reg, unsigned char val)
305 {
306 #ifdef VGA_OUTW_WRITE
307 vga_w_fast (regbase, VGA_SEQ_I, reg, val);
308 #else
309 vga_w (regbase, VGA_SEQ_I, reg);
310 vga_w (regbase, VGA_SEQ_D, val);
311 #endif /* VGA_OUTW_WRITE */
312 }
313
314 static inline unsigned char vga_io_rseq (unsigned char reg)
315 {
316 vga_io_w (VGA_SEQ_I, reg);
317 return vga_io_r (VGA_SEQ_D);
318 }
319
320 static inline void vga_io_wseq (unsigned char reg, unsigned char val)
321 {
322 #ifdef VGA_OUTW_WRITE
323 vga_io_w_fast (VGA_SEQ_I, reg, val);
324 #else
325 vga_io_w (VGA_SEQ_I, reg);
326 vga_io_w (VGA_SEQ_D, val);
327 #endif /* VGA_OUTW_WRITE */
328 }
329
330 static inline unsigned char vga_mm_rseq (caddr_t regbase, unsigned char reg)
331 {
332 vga_mm_w (regbase, VGA_SEQ_I, reg);
333 return vga_mm_r (regbase, VGA_SEQ_D);
334 }
335
336 static inline void vga_mm_wseq (caddr_t regbase, unsigned char reg, unsigned char val)
337 {
338 #ifdef VGA_OUTW_WRITE
339 vga_mm_w_fast (regbase, VGA_SEQ_I, reg, val);
340 #else
341 vga_mm_w (regbase, VGA_SEQ_I, reg);
342 vga_mm_w (regbase, VGA_SEQ_D, val);
343 #endif /* VGA_OUTW_WRITE */
344 }
345
346
347
348 /*
349 * VGA graphics controller register read/write
350 */
351
352 static inline unsigned char vga_rgfx (caddr_t regbase, unsigned char reg)
353 {
354 vga_w (regbase, VGA_GFX_I, reg);
355 return vga_r (regbase, VGA_GFX_D);
356 }
357
358 static inline void vga_wgfx (caddr_t regbase, unsigned char reg, unsigned char val)
359 {
360 #ifdef VGA_OUTW_WRITE
361 vga_w_fast (regbase, VGA_GFX_I, reg, val);
362 #else
363 vga_w (regbase, VGA_GFX_I, reg);
364 vga_w (regbase, VGA_GFX_D, val);
365 #endif /* VGA_OUTW_WRITE */
366 }
367
368 static inline unsigned char vga_io_rgfx (unsigned char reg)
369 {
370 vga_io_w (VGA_GFX_I, reg);
371 return vga_io_r (VGA_GFX_D);
372 }
373
374 static inline void vga_io_wgfx (unsigned char reg, unsigned char val)
375 {
376 #ifdef VGA_OUTW_WRITE
377 vga_io_w_fast (VGA_GFX_I, reg, val);
378 #else
379 vga_io_w (VGA_GFX_I, reg);
380 vga_io_w (VGA_GFX_D, val);
381 #endif /* VGA_OUTW_WRITE */
382 }
383
384 static inline unsigned char vga_mm_rgfx (caddr_t regbase, unsigned char reg)
385 {
386 vga_mm_w (regbase, VGA_GFX_I, reg);
387 return vga_mm_r (regbase, VGA_GFX_D);
388 }
389
390 static inline void vga_mm_wgfx (caddr_t regbase, unsigned char reg, unsigned char val)
391 {
392 #ifdef VGA_OUTW_WRITE
393 vga_mm_w_fast (regbase, VGA_GFX_I, reg, val);
394 #else
395 vga_mm_w (regbase, VGA_GFX_I, reg);
396 vga_mm_w (regbase, VGA_GFX_D, val);
397 #endif /* VGA_OUTW_WRITE */
398 }
399
400
401 /*
402 * VGA attribute controller register read/write
403 */
404
405 static inline unsigned char vga_rattr (caddr_t regbase, unsigned char reg)
406 {
407 vga_w (regbase, VGA_ATT_IW, reg);
408 return vga_r (regbase, VGA_ATT_R);
409 }
410
411 static inline void vga_wattr (caddr_t regbase, unsigned char reg, unsigned char val)
412 {
413 vga_w (regbase, VGA_ATT_IW, reg);
414 vga_w (regbase, VGA_ATT_W, val);
415 }
416
417 static inline unsigned char vga_io_rattr (unsigned char reg)
418 {
419 vga_io_w (VGA_ATT_IW, reg);
420 return vga_io_r (VGA_ATT_R);
421 }
422
423 static inline void vga_io_wattr (unsigned char reg, unsigned char val)
424 {
425 vga_io_w (VGA_ATT_IW, reg);
426 vga_io_w (VGA_ATT_W, val);
427 }
428
429 static inline unsigned char vga_mm_rattr (caddr_t regbase, unsigned char reg)
430 {
431 vga_mm_w (regbase, VGA_ATT_IW, reg);
432 return vga_mm_r (regbase, VGA_ATT_R);
433 }
434
435 static inline void vga_mm_wattr (caddr_t regbase, unsigned char reg, unsigned char val)
436 {
437 vga_mm_w (regbase, VGA_ATT_IW, reg);
438 vga_mm_w (regbase, VGA_ATT_W, val);
439 }
440
441
442
443
444 #endif /* __linux_video_vga_h__ */
445