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// dc_hw.c - Hardware found on the ARM7/AICA side of the Dreamcast
#include "ao.h"
#include "dc_hw.h"
#include "aica.h"
#define DK_CORE (1)
#if DK_CORE
#include "arm7.h"
#else
#include "arm7core.h"
#endif
static void aica_irq(struct sARM7 *cpu, int irq)
{
if (irq > 0)
{
#if DK_CORE
ARM7_SetFIQ(cpu, TRUE);
#else
set_irq_line(ARM7_FIRQ_LINE, 1);
#endif
}
else
{
#if DK_CORE
ARM7_SetFIQ(cpu, FALSE);
#else
set_irq_line(ARM7_FIRQ_LINE, 0);
#endif
}
}
#define MIXER_PAN_LEFT 1
#define MIXER_PAN_RIGHT 2
#define MIXER(level,pan) ((level & 0xff) | ((pan & 0x03) << 8))
#define YM3012_VOL(LVol,LPan,RVol,RPan) (MIXER(LVol,LPan)|(MIXER(RVol,RPan) << 16))
uint8 dc_read8(struct sARM7 *cpu, int addr)
{
if (addr < 0x800000)
{
return cpu->dc_ram[addr];
}
if ((addr >= 0x800000) && (addr <= 0x807fff))
{
int foo = AICA_0_r(cpu->AICA, (addr-0x800000)/2, 0);
if (addr & 1)
{
return foo>>8;
}
else
{
return foo & 0xff;
}
}
printf("R8 @ %x\n", addr);
return -1;
}
uint16 dc_read16(struct sARM7 *cpu, int addr)
{
if (addr < 0x800000)
{
return cpu->dc_ram[addr] | (cpu->dc_ram[addr+1]<<8);
}
if ((addr >= 0x800000) && (addr <= 0x807fff))
{
return AICA_0_r(cpu->AICA, (addr-0x800000)/2, 0);
}
printf("R16 @ %x\n", addr);
return -1;
}
uint32 dc_read32(struct sARM7 *cpu, int addr)
{
if (addr < 0x800000)
{
return cpu->dc_ram[addr] | (cpu->dc_ram[addr+1]<<8) | (cpu->dc_ram[addr+2]<<16) | (cpu->dc_ram[addr+3]<<24);
}
if ((addr >= 0x800000) && (addr <= 0x807fff))
{
addr &= 0x7fff;
return AICA_0_r(cpu->AICA, addr/2, 0) & 0xffff;
}
// printf("R32 @ %x\n", addr);
return 0;
}
void dc_write8(struct sARM7 *cpu, int addr, uint8 data)
{
if (addr < 0x800000)
{
cpu->dc_ram[addr] = data;
return;
}
if ((addr >= 0x800000) && (addr <= 0x807fff))
{
addr -= 0x800000;
if ((addr & 1))
AICA_0_w(cpu->AICA, addr>>1, data<<8, 0x00ff);
else
AICA_0_w(cpu->AICA, addr>>1, data, 0xff00);
return;
}
printf("W8 %x @ %x\n", data, addr);
}
void dc_write16(struct sARM7 *cpu, int addr, uint16 data)
{
if (addr < 0x800000)
{
cpu->dc_ram[addr] = data&0xff;
cpu->dc_ram[addr+1] = (data>>8) & 0xff;
return;
}
if ((addr >= 0x800000) && (addr <= 0x807fff))
{
AICA_0_w(cpu->AICA, (addr-0x800000)/2, data, 0);
return;
}
printf("W16 %x @ %x\n", data, addr);
}
void dc_write32(struct sARM7 *cpu, int addr, uint32 data)
{
if (addr < 0x800000)
{
cpu->dc_ram[addr] = data&0xff;
cpu->dc_ram[addr+1] = (data>>8) & 0xff;
cpu->dc_ram[addr+2] = (data>>16) & 0xff;
cpu->dc_ram[addr+3] = (data>>24) & 0xff;
return;
}
if ((addr >= 0x800000) && (addr <= 0x807fff))
{
addr -= 0x800000;
AICA_0_w(cpu->AICA, (addr>>1), data&0xffff, 0x0000);
AICA_0_w(cpu->AICA, (addr>>1)+1, data>>16, 0x0000);
return;
}
printf("W32 %x @ %x\n", data, addr);
}
void dc_hw_init(struct sARM7 *cpu)
{
#if 0
static struct AICAinterface aica_interface =
{
1,
{ cpu->dc_ram, },
{ YM3012_VOL(100, MIXER_PAN_LEFT, 100, MIXER_PAN_RIGHT) },
{ aica_irq, },
};
#endif
cpu->aica_interface.num = 1;
cpu->aica_interface.region[0] = cpu->dc_ram;
cpu->aica_interface.mixing_level[0] = YM3012_VOL(100, MIXER_PAN_LEFT, 100, MIXER_PAN_RIGHT);
cpu->aica_interface.irq_callback[0] = aica_irq;
cpu->aica_interface.cpu = cpu;
cpu->AICA = aica_start(&cpu->aica_interface);
}
void dc_hw_free (struct sARM7 *cpu) {
aica_stop (cpu->AICA);
cpu->AICA = NULL;
}
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