src/video/fbcon/3dfx_mmio.h

   1 /*
   2     SDL - Simple DirectMedia Layer
   3     Copyright (C) 1997-2009 Sam Lantinga
   4
   5     This library is free software; you can redistribute it and/or
   6     modify it under the terms of the GNU Lesser General Public
   7     License as published by the Free Software Foundation; either
   8     version 2.1 of the License, or (at your option) any later version.
   9
  10     This library is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13     Lesser General Public License for more details.
  14
  15     You should have received a copy of the GNU Lesser General Public
  16     License along with this library; if not, write to the Free Software
  17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18
  19     Sam Lantinga
  20     slouken@libsdl.org
  21 */
  22 #include "SDL_config.h"
  23
  24 /* 3Dfx register definitions */
  25
  26 #include "3dfx_regs.h"
  27
  28 /* 3Dfx control macros */
  29
  30 #define tdfx_in8(reg)           *(volatile Uint8  *)(mapped_io + (reg))
  31 #define tdfx_in32(reg)          *(volatile Uint32 *)(mapped_io + (reg))
  32
  33 #define tdfx_out8(reg,v)        *(volatile Uint8  *)(mapped_io + (reg)) = v;
  34 #define tdfx_out32(reg,v)       *(volatile Uint32 *)(mapped_io + (reg)) = v;
  35
  36
  37 /* Wait for fifo space */
  38 #define tdfx_wait(space)                                                \
  39 {                                                                       \
  40         while ( (tdfx_in8(TDFX_STATUS) & 0x1F) < space )                \
  41                 ;                                                       \
  42 }
  43
  44
  45 /* Wait for idle accelerator */
  46 #define tdfx_waitidle()                                                 \
  47 {                                                                       \
  48         int i = 0;                                                      \
  49                                                                         \
  50         tdfx_wait(1);                                                   \
  51         tdfx_out32(COMMAND_3D, COMMAND_3D_NOP);                         \
  52         do {                                                            \
  53                 i = (tdfx_in32(TDFX_STATUS) & STATUS_BUSY) ? 0 : i + 1; \
  54         } while ( i != 3 );                                             \
  55 }
  56