2 * linux/include/video/vga.h -- standard VGA chipset interaction
4 * Copyright 1999 Jeff Garzik <jgarzik@pobox.com>
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
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.
17 #ifndef __linux_video_vga_h__
18 #define __linux_video_vga_h__
20 #include <linux/config.h>
21 #include <linux/types.h>
28 * Ugh, we don't have PCI space, so map readb() and friends to use Zorro space
29 * for MMIO accesses. This should make cirrusfb work again on Amiga
40 #define outb_p(port, val) do { } while (0)
41 #define outw(port, val) do { } while (0)
43 #define writeb z_writeb
44 #define writew z_writew
46 #include <asm/byteorder.h>
49 /* Some of the code below is taken from SVGAlib. The original,
50 unmodified copyright notice for that code is below. */
51 /* VGAlib version 1.2 - (c) 1993 Tommy Frandsen */
53 /* This library is free software; you can redistribute it and/or */
54 /* modify it without any restrictions. This library is distributed */
55 /* in the hope that it will be useful, but without any warranty. */
57 /* Multi-chipset support Copyright 1993 Harm Hanemaayer */
58 /* partially copyrighted (C) 1993 by Hartmut Schirmer */
60 /* VGA data register ports */
61 #define VGA_CRT_DC 0x3D5 /* CRT Controller Data Register - color emulation */
62 #define VGA_CRT_DM 0x3B5 /* CRT Controller Data Register - mono emulation */
63 #define VGA_ATT_R 0x3C1 /* Attribute Controller Data Read Register */
64 #define VGA_ATT_W 0x3C0 /* Attribute Controller Data Write Register */
65 #define VGA_GFX_D 0x3CF /* Graphics Controller Data Register */
66 #define VGA_SEQ_D 0x3C5 /* Sequencer Data Register */
67 #define VGA_MIS_R 0x3CC /* Misc Output Read Register */
68 #define VGA_MIS_W 0x3C2 /* Misc Output Write Register */
69 #define VGA_FTC_R 0x3CA /* Feature Control Read Register */
70 #define VGA_IS1_RC 0x3DA /* Input Status Register 1 - color emulation */
71 #define VGA_IS1_RM 0x3BA /* Input Status Register 1 - mono emulation */
72 #define VGA_PEL_D 0x3C9 /* PEL Data Register */
73 #define VGA_PEL_MSK 0x3C6 /* PEL mask register */
75 /* EGA-specific registers */
76 #define EGA_GFX_E0 0x3CC /* Graphics enable processor 0 */
77 #define EGA_GFX_E1 0x3CA /* Graphics enable processor 1 */
79 /* VGA index register ports */
80 #define VGA_CRT_IC 0x3D4 /* CRT Controller Index - color emulation */
81 #define VGA_CRT_IM 0x3B4 /* CRT Controller Index - mono emulation */
82 #define VGA_ATT_IW 0x3C0 /* Attribute Controller Index & Data Write Register */
83 #define VGA_GFX_I 0x3CE /* Graphics Controller Index */
84 #define VGA_SEQ_I 0x3C4 /* Sequencer Index */
85 #define VGA_PEL_IW 0x3C8 /* PEL Write Index */
86 #define VGA_PEL_IR 0x3C7 /* PEL Read Index */
88 /* standard VGA indexes max counts */
89 #define VGA_CRT_C 0x19 /* Number of CRT Controller Registers */
90 #define VGA_ATT_C 0x15 /* Number of Attribute Controller Registers */
91 #define VGA_GFX_C 0x09 /* Number of Graphics Controller Registers */
92 #define VGA_SEQ_C 0x05 /* Number of Sequencer Registers */
93 #define VGA_MIS_C 0x01 /* Number of Misc Output Register */
95 /* VGA misc register bit masks */
96 #define VGA_MIS_COLOR 0x01
97 #define VGA_MIS_ENB_MEM_ACCESS 0x02
98 #define VGA_MIS_DCLK_28322_720 0x04
99 #define VGA_MIS_ENB_PLL_LOAD (0x04 | 0x08)
100 #define VGA_MIS_SEL_HIGH_PAGE 0x20
102 /* VGA CRT controller register indices */
103 #define VGA_CRTC_H_TOTAL 0
104 #define VGA_CRTC_H_DISP 1
105 #define VGA_CRTC_H_BLANK_START 2
106 #define VGA_CRTC_H_BLANK_END 3
107 #define VGA_CRTC_H_SYNC_START 4
108 #define VGA_CRTC_H_SYNC_END 5
109 #define VGA_CRTC_V_TOTAL 6
110 #define VGA_CRTC_OVERFLOW 7
111 #define VGA_CRTC_PRESET_ROW 8
112 #define VGA_CRTC_MAX_SCAN 9
113 #define VGA_CRTC_CURSOR_START 0x0A
114 #define VGA_CRTC_CURSOR_END 0x0B
115 #define VGA_CRTC_START_HI 0x0C
116 #define VGA_CRTC_START_LO 0x0D
117 #define VGA_CRTC_CURSOR_HI 0x0E
118 #define VGA_CRTC_CURSOR_LO 0x0F
119 #define VGA_CRTC_V_SYNC_START 0x10
120 #define VGA_CRTC_V_SYNC_END 0x11
121 #define VGA_CRTC_V_DISP_END 0x12
122 #define VGA_CRTC_OFFSET 0x13
123 #define VGA_CRTC_UNDERLINE 0x14
124 #define VGA_CRTC_V_BLANK_START 0x15
125 #define VGA_CRTC_V_BLANK_END 0x16
126 #define VGA_CRTC_MODE 0x17
127 #define VGA_CRTC_LINE_COMPARE 0x18
128 #define VGA_CRTC_REGS VGA_CRT_C
130 /* VGA CRT controller bit masks */
131 #define VGA_CR11_LOCK_CR0_CR7 0x80 /* lock writes to CR0 - CR7 */
132 #define VGA_CR17_H_V_SIGNALS_ENABLED 0x80
134 /* VGA attribute controller register indices */
135 #define VGA_ATC_PALETTE0 0x00
136 #define VGA_ATC_PALETTE1 0x01
137 #define VGA_ATC_PALETTE2 0x02
138 #define VGA_ATC_PALETTE3 0x03
139 #define VGA_ATC_PALETTE4 0x04
140 #define VGA_ATC_PALETTE5 0x05
141 #define VGA_ATC_PALETTE6 0x06
142 #define VGA_ATC_PALETTE7 0x07
143 #define VGA_ATC_PALETTE8 0x08
144 #define VGA_ATC_PALETTE9 0x09
145 #define VGA_ATC_PALETTEA 0x0A
146 #define VGA_ATC_PALETTEB 0x0B
147 #define VGA_ATC_PALETTEC 0x0C
148 #define VGA_ATC_PALETTED 0x0D
149 #define VGA_ATC_PALETTEE 0x0E
150 #define VGA_ATC_PALETTEF 0x0F
151 #define VGA_ATC_MODE 0x10
152 #define VGA_ATC_OVERSCAN 0x11
153 #define VGA_ATC_PLANE_ENABLE 0x12
154 #define VGA_ATC_PEL 0x13
155 #define VGA_ATC_COLOR_PAGE 0x14
157 #define VGA_AR_ENABLE_DISPLAY 0x20
159 /* VGA sequencer register indices */
160 #define VGA_SEQ_RESET 0x00
161 #define VGA_SEQ_CLOCK_MODE 0x01
162 #define VGA_SEQ_PLANE_WRITE 0x02
163 #define VGA_SEQ_CHARACTER_MAP 0x03
164 #define VGA_SEQ_MEMORY_MODE 0x04
166 /* VGA sequencer register bit masks */
167 #define VGA_SR01_CHAR_CLK_8DOTS 0x01 /* bit 0: character clocks 8 dots wide are generated */
168 #define VGA_SR01_SCREEN_OFF 0x20 /* bit 5: Screen is off */
169 #define VGA_SR02_ALL_PLANES 0x0F /* bits 3-0: enable access to all planes */
170 #define VGA_SR04_EXT_MEM 0x02 /* bit 1: allows complete mem access to 256K */
171 #define VGA_SR04_SEQ_MODE 0x04 /* bit 2: directs system to use a sequential addressing mode */
172 #define VGA_SR04_CHN_4M 0x08 /* bit 3: selects modulo 4 addressing for CPU access to display memory */
174 /* VGA graphics controller register indices */
175 #define VGA_GFX_SR_VALUE 0x00
176 #define VGA_GFX_SR_ENABLE 0x01
177 #define VGA_GFX_COMPARE_VALUE 0x02
178 #define VGA_GFX_DATA_ROTATE 0x03
179 #define VGA_GFX_PLANE_READ 0x04
180 #define VGA_GFX_MODE 0x05
181 #define VGA_GFX_MISC 0x06
182 #define VGA_GFX_COMPARE_MASK 0x07
183 #define VGA_GFX_BIT_MASK 0x08
185 /* VGA graphics controller bit masks */
186 #define VGA_GR06_GRAPHICS_MODE 0x01
188 /* macro for composing an 8-bit VGA register index and value
189 * into a single 16-bit quantity */
190 #define VGA_OUT16VAL(v, r) (((v) << 8) | (r))
192 /* decide whether we should enable the faster 16-bit VGA register writes */
193 #ifdef __LITTLE_ENDIAN
194 #define VGA_OUTW_WRITE
197 /* VGA State Save and Restore */
198 #define VGA_SAVE_FONT0 1 /* save/restore plane 2 fonts */
199 #define VGA_SAVE_FONT1 2 /* save/restore plane 3 fonts */
200 #define VGA_SAVE_TEXT 4 /* save/restore plane 0/1 fonts */
201 #define VGA_SAVE_FONTS 7 /* save/restore all fonts */
202 #define VGA_SAVE_MODE 8 /* save/restore video mode */
203 #define VGA_SAVE_CMAP 16 /* save/restore color map/DAC */
206 void __iomem *vgabase; /* mmio base, if supported */
207 unsigned long membase; /* VGA window base, 0 for default - 0xA000 */
208 __u32 memsize; /* VGA window size, 0 for default 64K */
209 __u32 flags; /* what state[s] to save (see VGA_SAVE_*) */
210 __u32 depth; /* current fb depth, not important */
211 __u32 num_attr; /* number of att registers, 0 for default */
212 __u32 num_crtc; /* number of crt registers, 0 for default */
213 __u32 num_gfx; /* number of gfx registers, 0 for default */
214 __u32 num_seq; /* number of seq registers, 0 for default */
218 extern int save_vga(struct vgastate *state);
219 extern int restore_vga(struct vgastate *state);
222 * generic VGA port read/write
225 static inline unsigned char vga_io_r (unsigned short port)
230 static inline void vga_io_w (unsigned short port, unsigned char val)
235 static inline void vga_io_w_fast (unsigned short port, unsigned char reg,
238 outw(VGA_OUT16VAL (val, reg), port);
241 static inline unsigned char vga_mm_r (void __iomem *regbase, unsigned short port)
243 return readb (regbase + port);
246 static inline void vga_mm_w (void __iomem *regbase, unsigned short port, unsigned char val)
248 writeb (val, regbase + port);
251 static inline void vga_mm_w_fast (void __iomem *regbase, unsigned short port,
252 unsigned char reg, unsigned char val)
254 writew (VGA_OUT16VAL (val, reg), regbase + port);
257 static inline unsigned char vga_r (void __iomem *regbase, unsigned short port)
260 return vga_mm_r (regbase, port);
262 return vga_io_r (port);
265 static inline void vga_w (void __iomem *regbase, unsigned short port, unsigned char val)
268 vga_mm_w (regbase, port, val);
270 vga_io_w (port, val);
274 static inline void vga_w_fast (void __iomem *regbase, unsigned short port,
275 unsigned char reg, unsigned char val)
278 vga_mm_w_fast (regbase, port, reg, val);
280 vga_io_w_fast (port, reg, val);
285 * VGA CRTC register read/write
288 static inline unsigned char vga_rcrt (void __iomem *regbase, unsigned char reg)
290 vga_w (regbase, VGA_CRT_IC, reg);
291 return vga_r (regbase, VGA_CRT_DC);
294 static inline void vga_wcrt (void __iomem *regbase, unsigned char reg, unsigned char val)
296 #ifdef VGA_OUTW_WRITE
297 vga_w_fast (regbase, VGA_CRT_IC, reg, val);
299 vga_w (regbase, VGA_CRT_IC, reg);
300 vga_w (regbase, VGA_CRT_DC, val);
301 #endif /* VGA_OUTW_WRITE */
304 static inline unsigned char vga_io_rcrt (unsigned char reg)
306 vga_io_w (VGA_CRT_IC, reg);
307 return vga_io_r (VGA_CRT_DC);
310 static inline void vga_io_wcrt (unsigned char reg, unsigned char val)
312 #ifdef VGA_OUTW_WRITE
313 vga_io_w_fast (VGA_CRT_IC, reg, val);
315 vga_io_w (VGA_CRT_IC, reg);
316 vga_io_w (VGA_CRT_DC, val);
317 #endif /* VGA_OUTW_WRITE */
320 static inline unsigned char vga_mm_rcrt (void __iomem *regbase, unsigned char reg)
322 vga_mm_w (regbase, VGA_CRT_IC, reg);
323 return vga_mm_r (regbase, VGA_CRT_DC);
326 static inline void vga_mm_wcrt (void __iomem *regbase, unsigned char reg, unsigned char val)
328 #ifdef VGA_OUTW_WRITE
329 vga_mm_w_fast (regbase, VGA_CRT_IC, reg, val);
331 vga_mm_w (regbase, VGA_CRT_IC, reg);
332 vga_mm_w (regbase, VGA_CRT_DC, val);
333 #endif /* VGA_OUTW_WRITE */
338 * VGA sequencer register read/write
341 static inline unsigned char vga_rseq (void __iomem *regbase, unsigned char reg)
343 vga_w (regbase, VGA_SEQ_I, reg);
344 return vga_r (regbase, VGA_SEQ_D);
347 static inline void vga_wseq (void __iomem *regbase, unsigned char reg, unsigned char val)
349 #ifdef VGA_OUTW_WRITE
350 vga_w_fast (regbase, VGA_SEQ_I, reg, val);
352 vga_w (regbase, VGA_SEQ_I, reg);
353 vga_w (regbase, VGA_SEQ_D, val);
354 #endif /* VGA_OUTW_WRITE */
357 static inline unsigned char vga_io_rseq (unsigned char reg)
359 vga_io_w (VGA_SEQ_I, reg);
360 return vga_io_r (VGA_SEQ_D);
363 static inline void vga_io_wseq (unsigned char reg, unsigned char val)
365 #ifdef VGA_OUTW_WRITE
366 vga_io_w_fast (VGA_SEQ_I, reg, val);
368 vga_io_w (VGA_SEQ_I, reg);
369 vga_io_w (VGA_SEQ_D, val);
370 #endif /* VGA_OUTW_WRITE */
373 static inline unsigned char vga_mm_rseq (void __iomem *regbase, unsigned char reg)
375 vga_mm_w (regbase, VGA_SEQ_I, reg);
376 return vga_mm_r (regbase, VGA_SEQ_D);
379 static inline void vga_mm_wseq (void __iomem *regbase, unsigned char reg, unsigned char val)
381 #ifdef VGA_OUTW_WRITE
382 vga_mm_w_fast (regbase, VGA_SEQ_I, reg, val);
384 vga_mm_w (regbase, VGA_SEQ_I, reg);
385 vga_mm_w (regbase, VGA_SEQ_D, val);
386 #endif /* VGA_OUTW_WRITE */
390 * VGA graphics controller register read/write
393 static inline unsigned char vga_rgfx (void __iomem *regbase, unsigned char reg)
395 vga_w (regbase, VGA_GFX_I, reg);
396 return vga_r (regbase, VGA_GFX_D);
399 static inline void vga_wgfx (void __iomem *regbase, unsigned char reg, unsigned char val)
401 #ifdef VGA_OUTW_WRITE
402 vga_w_fast (regbase, VGA_GFX_I, reg, val);
404 vga_w (regbase, VGA_GFX_I, reg);
405 vga_w (regbase, VGA_GFX_D, val);
406 #endif /* VGA_OUTW_WRITE */
409 static inline unsigned char vga_io_rgfx (unsigned char reg)
411 vga_io_w (VGA_GFX_I, reg);
412 return vga_io_r (VGA_GFX_D);
415 static inline void vga_io_wgfx (unsigned char reg, unsigned char val)
417 #ifdef VGA_OUTW_WRITE
418 vga_io_w_fast (VGA_GFX_I, reg, val);
420 vga_io_w (VGA_GFX_I, reg);
421 vga_io_w (VGA_GFX_D, val);
422 #endif /* VGA_OUTW_WRITE */
425 static inline unsigned char vga_mm_rgfx (void __iomem *regbase, unsigned char reg)
427 vga_mm_w (regbase, VGA_GFX_I, reg);
428 return vga_mm_r (regbase, VGA_GFX_D);
431 static inline void vga_mm_wgfx (void __iomem *regbase, unsigned char reg, unsigned char val)
433 #ifdef VGA_OUTW_WRITE
434 vga_mm_w_fast (regbase, VGA_GFX_I, reg, val);
436 vga_mm_w (regbase, VGA_GFX_I, reg);
437 vga_mm_w (regbase, VGA_GFX_D, val);
438 #endif /* VGA_OUTW_WRITE */
443 * VGA attribute controller register read/write
446 static inline unsigned char vga_rattr (void __iomem *regbase, unsigned char reg)
448 vga_w (regbase, VGA_ATT_IW, reg);
449 return vga_r (regbase, VGA_ATT_R);
452 static inline void vga_wattr (void __iomem *regbase, unsigned char reg, unsigned char val)
454 vga_w (regbase, VGA_ATT_IW, reg);
455 vga_w (regbase, VGA_ATT_W, val);
458 static inline unsigned char vga_io_rattr (unsigned char reg)
460 vga_io_w (VGA_ATT_IW, reg);
461 return vga_io_r (VGA_ATT_R);
464 static inline void vga_io_wattr (unsigned char reg, unsigned char val)
466 vga_io_w (VGA_ATT_IW, reg);
467 vga_io_w (VGA_ATT_W, val);
470 static inline unsigned char vga_mm_rattr (void __iomem *regbase, unsigned char reg)
472 vga_mm_w (regbase, VGA_ATT_IW, reg);
473 return vga_mm_r (regbase, VGA_ATT_R);
476 static inline void vga_mm_wattr (void __iomem *regbase, unsigned char reg, unsigned char val)
478 vga_mm_w (regbase, VGA_ATT_IW, reg);
479 vga_mm_w (regbase, VGA_ATT_W, val);
482 #endif /* __linux_video_vga_h__ */