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.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
 204 struct 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
 217 extern int save_vga(struct vgastate *state);
 218 extern int restore_vga(struct vgastate *state);
 219
 220 /*
 221  * generic VGA port read/write
 222  */
 223
 224 static inline unsigned char vga_io_r (unsigned short port)
 225 {
 226         return inb_p(port);
 227 }
 228
 229 static inline void vga_io_w (unsigned short port, unsigned char val)
 230 {
 231         outb_p(val, port);
 232 }
 233
 234 static 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
 240 static inline unsigned char vga_mm_r (void __iomem *regbase, unsigned short port)
 241 {
 242         return readb (regbase + port);
 243 }
 244
 245 static inline void vga_mm_w (void __iomem *regbase, unsigned short port, unsigned char val)
 246 {
 247         writeb (val, regbase + port);
 248 }
 249
 250 static 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
 256 static 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
 264 static 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
 273 static 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
 287 static 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
 293 static 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
 303 static 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
 309 static 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
 319 static 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
 325 static 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
 340 static 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
 346 static 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
 356 static 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
 362 static 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
 372 static 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
 378 static 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
 392 static 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
 398 static 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
 408 static 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
 414 static 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
 424 static 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
 430 static 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
 445 static 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
 451 static 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
 457 static 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
 463 static 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
 469 static 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
 475 static 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__ */