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rootRegs.cpp
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rootRegs.cpp
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#include "rootRegs.h"
#include <SDL2/SDL.h>
uint32_t rootRegsInit( tgRootRegs_t *regs )
{
regs->id = 0x80000000;
regs->version = 0x20241110;
regs->videoMuxMode = 0x0;
regs->videoVSync = 1;
regs->tickTimerValue = SDL_GetTicks();
regs->frameTimer = 0;
regs->mtime = 0;
regs->mtimeCmp = 0;
return RV_OK;
}
uint32_t rootRegsReadReg( tgRootRegs_t *regs, uint16_t addr )
{
switch( addr >> 2 )
{
case 0x00:
return regs->id;
break;
case 0x01:
return regs->version;
break;
case 0x02:
return regs->videoMuxMode;
break;
case 0x03:
if( regs->videoVSync )
{
regs->videoVSync = 0;
return 1;
}
else
{
return 0;
}
break;
case 0x04:
return 0;
case 0x05:
return regs->gpoPort;
break;
case 0x06:
//tick timer config
return 0;
break;
case 0x07:
//tick timer
return (uint32_t)( SDL_GetTicks() - regs->tickTimerValue );
break;
case 0x08:
//frame timer
return regs->frameTimer;
break;
case 0x0a:
//mtime lo
return (uint32_t)( regs->mtime & 0xffffffff );
case 0x0b:
//mtime hi
return (uint32_t)( ( regs->mtime >> 32 ) & 0xffffffff );
case 0x0c:
//mtimeCmp lo
return (uint32_t)( regs->mtimeCmp & 0xffffffff );
case 0x0d:
//mtimeCmp hi
return (uint32_t)( ( regs->mtimeCmp >> 32 ) & 0xffffffff );
}
return 0;
}
uint32_t rootRegsWriteReg( tgRootRegs_t *regs, sdcContext_t *sdctx, uint16_t addr, uint32_t value )
{
switch( addr >> 2 )
{
case 0x02:
regs->videoMuxMode = value & 0xffff;
break;
case 0x05:
regs->gpoPort = value;
sdcSPICE( sdctx, value & 1 ); //sd CE connected to GPIO 0
break;
case 0x06:
//reset tick timer
if( value & 1 )
{
regs->tickTimerValue = SDL_GetTicks();
}
break;
case 0x08:
//frame timer
regs->frameTimer = 0;
break;
case 0x0a:
//mtime lo
//return (uint32_t)( regs->mtime & 0xffffffff );
break;
case 0x0b:
//mtime hi
//return (uint32_t)( ( regs->mtime >> 32 ) & 0xffffffff );
break;
case 0x0c:
//mtimeCmp lo
regs->mtimeCmp &= 0xffffffff00000000;
regs->mtimeCmp |= (uint64_t)value;
break;
case 0x0d:
//mtimeCmp hi
regs->mtimeCmp &= 0x00000000ffffffff;
regs->mtimeCmp |= ( (uint64_t) value ) << 32;
break;
}
return RV_OK;
}