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Linux kernel mirror (for testing)
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linux
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.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/types.h>
21#include <asm/io.h>
22#ifndef CONFIG_AMIGA
23#include <asm/vga.h>
24#else
25/*
26 * FIXME
27 * Ugh, we don't have PCI space, so map readb() and friends to use Zorro space
28 * for MMIO accesses. This should make cirrusfb work again on Amiga
29 */
30#undef inb_p
31#undef inw_p
32#undef outb_p
33#undef outw
34#undef readb
35#undef writeb
36#undef writew
37#define inb_p(port) 0
38#define inw_p(port) 0
39#define outb_p(port, val) do { } while (0)
40#define outw(port, val) do { } while (0)
41#define readb z_readb
42#define writeb z_writeb
43#define writew z_writew
44#endif
45#include <asm/byteorder.h>
46
47
48/* Some of the code below is taken from SVGAlib. The original,
49 unmodified copyright notice for that code is below. */
50/* VGAlib version 1.2 - (c) 1993 Tommy Frandsen */
51/* */
52/* This library is free software; you can redistribute it and/or */
53/* modify it without any restrictions. This library is distributed */
54/* in the hope that it will be useful, but without any warranty. */
55
56/* Multi-chipset support Copyright 1993 Harm Hanemaayer */
57/* partially copyrighted (C) 1993 by Hartmut Schirmer */
58
59/* VGA data register ports */
60#define VGA_CRT_DC 0x3D5 /* CRT Controller Data Register - color emulation */
61#define VGA_CRT_DM 0x3B5 /* CRT Controller Data Register - mono emulation */
62#define VGA_ATT_R 0x3C1 /* Attribute Controller Data Read Register */
63#define VGA_ATT_W 0x3C0 /* Attribute Controller Data Write Register */
64#define VGA_GFX_D 0x3CF /* Graphics Controller Data Register */
65#define VGA_SEQ_D 0x3C5 /* Sequencer Data Register */
66#define VGA_MIS_R 0x3CC /* Misc Output Read Register */
67#define VGA_MIS_W 0x3C2 /* Misc Output Write Register */
68#define VGA_FTC_R 0x3CA /* Feature Control Read Register */
69#define VGA_IS1_RC 0x3DA /* Input Status Register 1 - color emulation */
70#define VGA_IS1_RM 0x3BA /* Input Status Register 1 - mono emulation */
71#define VGA_PEL_D 0x3C9 /* PEL Data Register */
72#define VGA_PEL_MSK 0x3C6 /* PEL mask register */
73
74/* EGA-specific registers */
75#define EGA_GFX_E0 0x3CC /* Graphics enable processor 0 */
76#define EGA_GFX_E1 0x3CA /* Graphics enable processor 1 */
77
78/* VGA index register ports */
79#define VGA_CRT_IC 0x3D4 /* CRT Controller Index - color emulation */
80#define VGA_CRT_IM 0x3B4 /* CRT Controller Index - mono emulation */
81#define VGA_ATT_IW 0x3C0 /* Attribute Controller Index & Data Write Register */
82#define VGA_GFX_I 0x3CE /* Graphics Controller Index */
83#define VGA_SEQ_I 0x3C4 /* Sequencer Index */
84#define VGA_PEL_IW 0x3C8 /* PEL Write Index */
85#define VGA_PEL_IR 0x3C7 /* PEL Read Index */
86
87/* standard VGA indexes max counts */
88#define VGA_CRT_C 0x19 /* Number of CRT Controller Registers */
89#define VGA_ATT_C 0x15 /* Number of Attribute Controller Registers */
90#define VGA_GFX_C 0x09 /* Number of Graphics Controller Registers */
91#define VGA_SEQ_C 0x05 /* Number of Sequencer Registers */
92#define VGA_MIS_C 0x01 /* Number of Misc Output Register */
93
94/* VGA misc register bit masks */
95#define VGA_MIS_COLOR 0x01
96#define VGA_MIS_ENB_MEM_ACCESS 0x02
97#define VGA_MIS_DCLK_28322_720 0x04
98#define VGA_MIS_ENB_PLL_LOAD (0x04 | 0x08)
99#define VGA_MIS_SEL_HIGH_PAGE 0x20
100
101/* VGA CRT controller register indices */
102#define VGA_CRTC_H_TOTAL 0
103#define VGA_CRTC_H_DISP 1
104#define VGA_CRTC_H_BLANK_START 2
105#define VGA_CRTC_H_BLANK_END 3
106#define VGA_CRTC_H_SYNC_START 4
107#define VGA_CRTC_H_SYNC_END 5
108#define VGA_CRTC_V_TOTAL 6
109#define VGA_CRTC_OVERFLOW 7
110#define VGA_CRTC_PRESET_ROW 8
111#define VGA_CRTC_MAX_SCAN 9
112#define VGA_CRTC_CURSOR_START 0x0A
113#define VGA_CRTC_CURSOR_END 0x0B
114#define VGA_CRTC_START_HI 0x0C
115#define VGA_CRTC_START_LO 0x0D
116#define VGA_CRTC_CURSOR_HI 0x0E
117#define VGA_CRTC_CURSOR_LO 0x0F
118#define VGA_CRTC_V_SYNC_START 0x10
119#define VGA_CRTC_V_SYNC_END 0x11
120#define VGA_CRTC_V_DISP_END 0x12
121#define VGA_CRTC_OFFSET 0x13
122#define VGA_CRTC_UNDERLINE 0x14
123#define VGA_CRTC_V_BLANK_START 0x15
124#define VGA_CRTC_V_BLANK_END 0x16
125#define VGA_CRTC_MODE 0x17
126#define VGA_CRTC_LINE_COMPARE 0x18
127#define VGA_CRTC_REGS VGA_CRT_C
128
129/* VGA CRT controller bit masks */
130#define VGA_CR11_LOCK_CR0_CR7 0x80 /* lock writes to CR0 - CR7 */
131#define VGA_CR17_H_V_SIGNALS_ENABLED 0x80
132
133/* VGA attribute controller register indices */
134#define VGA_ATC_PALETTE0 0x00
135#define VGA_ATC_PALETTE1 0x01
136#define VGA_ATC_PALETTE2 0x02
137#define VGA_ATC_PALETTE3 0x03
138#define VGA_ATC_PALETTE4 0x04
139#define VGA_ATC_PALETTE5 0x05
140#define VGA_ATC_PALETTE6 0x06
141#define VGA_ATC_PALETTE7 0x07
142#define VGA_ATC_PALETTE8 0x08
143#define VGA_ATC_PALETTE9 0x09
144#define VGA_ATC_PALETTEA 0x0A
145#define VGA_ATC_PALETTEB 0x0B
146#define VGA_ATC_PALETTEC 0x0C
147#define VGA_ATC_PALETTED 0x0D
148#define VGA_ATC_PALETTEE 0x0E
149#define VGA_ATC_PALETTEF 0x0F
150#define VGA_ATC_MODE 0x10
151#define VGA_ATC_OVERSCAN 0x11
152#define VGA_ATC_PLANE_ENABLE 0x12
153#define VGA_ATC_PEL 0x13
154#define VGA_ATC_COLOR_PAGE 0x14
155
156#define VGA_AR_ENABLE_DISPLAY 0x20
157
158/* VGA sequencer register indices */
159#define VGA_SEQ_RESET 0x00
160#define VGA_SEQ_CLOCK_MODE 0x01
161#define VGA_SEQ_PLANE_WRITE 0x02
162#define VGA_SEQ_CHARACTER_MAP 0x03
163#define VGA_SEQ_MEMORY_MODE 0x04
164
165/* VGA sequencer register bit masks */
166#define VGA_SR01_CHAR_CLK_8DOTS 0x01 /* bit 0: character clocks 8 dots wide are generated */
167#define VGA_SR01_SCREEN_OFF 0x20 /* bit 5: Screen is off */
168#define VGA_SR02_ALL_PLANES 0x0F /* bits 3-0: enable access to all planes */
169#define VGA_SR04_EXT_MEM 0x02 /* bit 1: allows complete mem access to 256K */
170#define VGA_SR04_SEQ_MODE 0x04 /* bit 2: directs system to use a sequential addressing mode */
171#define VGA_SR04_CHN_4M 0x08 /* bit 3: selects modulo 4 addressing for CPU access to display memory */
172
173/* VGA graphics controller register indices */
174#define VGA_GFX_SR_VALUE 0x00
175#define VGA_GFX_SR_ENABLE 0x01
176#define VGA_GFX_COMPARE_VALUE 0x02
177#define VGA_GFX_DATA_ROTATE 0x03
178#define VGA_GFX_PLANE_READ 0x04
179#define VGA_GFX_MODE 0x05
180#define VGA_GFX_MISC 0x06
181#define VGA_GFX_COMPARE_MASK 0x07
182#define VGA_GFX_BIT_MASK 0x08
183
184/* VGA graphics controller bit masks */
185#define VGA_GR06_GRAPHICS_MODE 0x01
186
187/* macro for composing an 8-bit VGA register index and value
188 * into a single 16-bit quantity */
189#define VGA_OUT16VAL(v, r) (((v) << 8) | (r))
190
191/* decide whether we should enable the faster 16-bit VGA register writes */
192#ifdef __LITTLE_ENDIAN
193#define VGA_OUTW_WRITE
194#endif
195
196/* VGA State Save and Restore */
197#define VGA_SAVE_FONT0 1 /* save/restore plane 2 fonts */
198#define VGA_SAVE_FONT1 2 /* save/restore plane 3 fonts */
199#define VGA_SAVE_TEXT 4 /* save/restore plane 0/1 fonts */
200#define VGA_SAVE_FONTS 7 /* save/restore all fonts */
201#define VGA_SAVE_MODE 8 /* save/restore video mode */
202#define VGA_SAVE_CMAP 16 /* save/restore color map/DAC */
203
204struct vgastate {
205 void __iomem *vgabase; /* mmio base, if supported */
206 unsigned long membase; /* VGA window base, 0 for default - 0xA000 */
207 __u32 memsize; /* VGA window size, 0 for default 64K */
208 __u32 flags; /* what state[s] to save (see VGA_SAVE_*) */
209 __u32 depth; /* current fb depth, not important */
210 __u32 num_attr; /* number of att registers, 0 for default */
211 __u32 num_crtc; /* number of crt registers, 0 for default */
212 __u32 num_gfx; /* number of gfx registers, 0 for default */
213 __u32 num_seq; /* number of seq registers, 0 for default */
214 void *vidstate;
215};
216
217extern int save_vga(struct vgastate *state);
218extern int restore_vga(struct vgastate *state);
219
220/*
221 * generic VGA port read/write
222 */
223
224static inline unsigned char vga_io_r (unsigned short port)
225{
226 return inb_p(port);
227}
228
229static inline void vga_io_w (unsigned short port, unsigned char val)
230{
231 outb_p(val, port);
232}
233
234static inline void vga_io_w_fast (unsigned short port, unsigned char reg,
235 unsigned char val)
236{
237 outw(VGA_OUT16VAL (val, reg), port);
238}
239
240static inline unsigned char vga_mm_r (void __iomem *regbase, unsigned short port)
241{
242 return readb (regbase + port);
243}
244
245static inline void vga_mm_w (void __iomem *regbase, unsigned short port, unsigned char val)
246{
247 writeb (val, regbase + port);
248}
249
250static inline void vga_mm_w_fast (void __iomem *regbase, unsigned short port,
251 unsigned char reg, unsigned char val)
252{
253 writew (VGA_OUT16VAL (val, reg), regbase + port);
254}
255
256static inline unsigned char vga_r (void __iomem *regbase, unsigned short port)
257{
258 if (regbase)
259 return vga_mm_r (regbase, port);
260 else
261 return vga_io_r (port);
262}
263
264static inline void vga_w (void __iomem *regbase, unsigned short port, unsigned char val)
265{
266 if (regbase)
267 vga_mm_w (regbase, port, val);
268 else
269 vga_io_w (port, val);
270}
271
272
273static inline void vga_w_fast (void __iomem *regbase, unsigned short port,
274 unsigned char reg, unsigned char val)
275{
276 if (regbase)
277 vga_mm_w_fast (regbase, port, reg, val);
278 else
279 vga_io_w_fast (port, reg, val);
280}
281
282
283/*
284 * VGA CRTC register read/write
285 */
286
287static inline unsigned char vga_rcrt (void __iomem *regbase, unsigned char reg)
288{
289 vga_w (regbase, VGA_CRT_IC, reg);
290 return vga_r (regbase, VGA_CRT_DC);
291}
292
293static inline void vga_wcrt (void __iomem *regbase, unsigned char reg, unsigned char val)
294{
295#ifdef VGA_OUTW_WRITE
296 vga_w_fast (regbase, VGA_CRT_IC, reg, val);
297#else
298 vga_w (regbase, VGA_CRT_IC, reg);
299 vga_w (regbase, VGA_CRT_DC, val);
300#endif /* VGA_OUTW_WRITE */
301}
302
303static inline unsigned char vga_io_rcrt (unsigned char reg)
304{
305 vga_io_w (VGA_CRT_IC, reg);
306 return vga_io_r (VGA_CRT_DC);
307}
308
309static inline void vga_io_wcrt (unsigned char reg, unsigned char val)
310{
311#ifdef VGA_OUTW_WRITE
312 vga_io_w_fast (VGA_CRT_IC, reg, val);
313#else
314 vga_io_w (VGA_CRT_IC, reg);
315 vga_io_w (VGA_CRT_DC, val);
316#endif /* VGA_OUTW_WRITE */
317}
318
319static inline unsigned char vga_mm_rcrt (void __iomem *regbase, unsigned char reg)
320{
321 vga_mm_w (regbase, VGA_CRT_IC, reg);
322 return vga_mm_r (regbase, VGA_CRT_DC);
323}
324
325static inline void vga_mm_wcrt (void __iomem *regbase, unsigned char reg, unsigned char val)
326{
327#ifdef VGA_OUTW_WRITE
328 vga_mm_w_fast (regbase, VGA_CRT_IC, reg, val);
329#else
330 vga_mm_w (regbase, VGA_CRT_IC, reg);
331 vga_mm_w (regbase, VGA_CRT_DC, val);
332#endif /* VGA_OUTW_WRITE */
333}
334
335
336/*
337 * VGA sequencer register read/write
338 */
339
340static inline unsigned char vga_rseq (void __iomem *regbase, unsigned char reg)
341{
342 vga_w (regbase, VGA_SEQ_I, reg);
343 return vga_r (regbase, VGA_SEQ_D);
344}
345
346static inline void vga_wseq (void __iomem *regbase, unsigned char reg, unsigned char val)
347{
348#ifdef VGA_OUTW_WRITE
349 vga_w_fast (regbase, VGA_SEQ_I, reg, val);
350#else
351 vga_w (regbase, VGA_SEQ_I, reg);
352 vga_w (regbase, VGA_SEQ_D, val);
353#endif /* VGA_OUTW_WRITE */
354}
355
356static inline unsigned char vga_io_rseq (unsigned char reg)
357{
358 vga_io_w (VGA_SEQ_I, reg);
359 return vga_io_r (VGA_SEQ_D);
360}
361
362static inline void vga_io_wseq (unsigned char reg, unsigned char val)
363{
364#ifdef VGA_OUTW_WRITE
365 vga_io_w_fast (VGA_SEQ_I, reg, val);
366#else
367 vga_io_w (VGA_SEQ_I, reg);
368 vga_io_w (VGA_SEQ_D, val);
369#endif /* VGA_OUTW_WRITE */
370}
371
372static inline unsigned char vga_mm_rseq (void __iomem *regbase, unsigned char reg)
373{
374 vga_mm_w (regbase, VGA_SEQ_I, reg);
375 return vga_mm_r (regbase, VGA_SEQ_D);
376}
377
378static inline void vga_mm_wseq (void __iomem *regbase, unsigned char reg, unsigned char val)
379{
380#ifdef VGA_OUTW_WRITE
381 vga_mm_w_fast (regbase, VGA_SEQ_I, reg, val);
382#else
383 vga_mm_w (regbase, VGA_SEQ_I, reg);
384 vga_mm_w (regbase, VGA_SEQ_D, val);
385#endif /* VGA_OUTW_WRITE */
386}
387
388/*
389 * VGA graphics controller register read/write
390 */
391
392static inline unsigned char vga_rgfx (void __iomem *regbase, unsigned char reg)
393{
394 vga_w (regbase, VGA_GFX_I, reg);
395 return vga_r (regbase, VGA_GFX_D);
396}
397
398static inline void vga_wgfx (void __iomem *regbase, unsigned char reg, unsigned char val)
399{
400#ifdef VGA_OUTW_WRITE
401 vga_w_fast (regbase, VGA_GFX_I, reg, val);
402#else
403 vga_w (regbase, VGA_GFX_I, reg);
404 vga_w (regbase, VGA_GFX_D, val);
405#endif /* VGA_OUTW_WRITE */
406}
407
408static inline unsigned char vga_io_rgfx (unsigned char reg)
409{
410 vga_io_w (VGA_GFX_I, reg);
411 return vga_io_r (VGA_GFX_D);
412}
413
414static inline void vga_io_wgfx (unsigned char reg, unsigned char val)
415{
416#ifdef VGA_OUTW_WRITE
417 vga_io_w_fast (VGA_GFX_I, reg, val);
418#else
419 vga_io_w (VGA_GFX_I, reg);
420 vga_io_w (VGA_GFX_D, val);
421#endif /* VGA_OUTW_WRITE */
422}
423
424static inline unsigned char vga_mm_rgfx (void __iomem *regbase, unsigned char reg)
425{
426 vga_mm_w (regbase, VGA_GFX_I, reg);
427 return vga_mm_r (regbase, VGA_GFX_D);
428}
429
430static inline void vga_mm_wgfx (void __iomem *regbase, unsigned char reg, unsigned char val)
431{
432#ifdef VGA_OUTW_WRITE
433 vga_mm_w_fast (regbase, VGA_GFX_I, reg, val);
434#else
435 vga_mm_w (regbase, VGA_GFX_I, reg);
436 vga_mm_w (regbase, VGA_GFX_D, val);
437#endif /* VGA_OUTW_WRITE */
438}
439
440
441/*
442 * VGA attribute controller register read/write
443 */
444
445static inline unsigned char vga_rattr (void __iomem *regbase, unsigned char reg)
446{
447 vga_w (regbase, VGA_ATT_IW, reg);
448 return vga_r (regbase, VGA_ATT_R);
449}
450
451static inline void vga_wattr (void __iomem *regbase, unsigned char reg, unsigned char val)
452{
453 vga_w (regbase, VGA_ATT_IW, reg);
454 vga_w (regbase, VGA_ATT_W, val);
455}
456
457static inline unsigned char vga_io_rattr (unsigned char reg)
458{
459 vga_io_w (VGA_ATT_IW, reg);
460 return vga_io_r (VGA_ATT_R);
461}
462
463static inline void vga_io_wattr (unsigned char reg, unsigned char val)
464{
465 vga_io_w (VGA_ATT_IW, reg);
466 vga_io_w (VGA_ATT_W, val);
467}
468
469static inline unsigned char vga_mm_rattr (void __iomem *regbase, unsigned char reg)
470{
471 vga_mm_w (regbase, VGA_ATT_IW, reg);
472 return vga_mm_r (regbase, VGA_ATT_R);
473}
474
475static inline void vga_mm_wattr (void __iomem *regbase, unsigned char reg, unsigned char val)
476{
477 vga_mm_w (regbase, VGA_ATT_IW, reg);
478 vga_mm_w (regbase, VGA_ATT_W, val);
479}
480
481#endif /* __linux_video_vga_h__ */