LXR linux/include/video/vga.h

   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 __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__ */
 482