// Writes a word to the PI MMIO register space.
int write_pi_regs(void *opaque, uint32_t address, uint32_t word, uint32_t dqm) {
struct pi_controller *pi = (struct pi_controller *) opaque;
unsigned offset = address - PI_REGS_BASE_ADDRESS;
enum pi_register reg = (offset >> 2);
debug_mmio_write(pi, pi_register_mnemonics[reg], word, dqm);
if (reg == PI_STATUS_REG) {
if (word & 0x1)
pi->regs[reg] = 0;
if (word & 0x2) {
clear_rcp_interrupt(pi->bus->vr4300, MI_INTR_PI);
pi->regs[reg] &= ~0x8;
}
}
else {
pi->regs[reg] &= ~dqm;
pi->regs[reg] |= word;
if (reg == PI_CART_ADDR_REG)
dd_pi_write(pi->bus->dd, word);
else if (reg == PI_WR_LEN_REG) {
if (pi->regs[PI_DRAM_ADDR_REG] == 0xFFFFFFFF) {
pi->regs[PI_STATUS_REG] &= ~0x1;
pi->regs[PI_STATUS_REG] |= 0x8;
signal_rcp_interrupt(pi->bus->vr4300, MI_INTR_PI);
return 0;
}
pi->bytes_to_copy = (pi->regs[PI_WR_LEN_REG] & 0xFFFFFF) + 1;
pi->counter = pi->bytes_to_copy / 2 + 100; // Assume ~2 bytes/clock?
pi->regs[PI_STATUS_REG] |= 0x9; // I'm busy!
pi->is_dma_read = false;
}
else if (reg == PI_RD_LEN_REG) {
if (pi->regs[PI_DRAM_ADDR_REG] == 0xFFFFFFFF) {
pi->regs[PI_STATUS_REG] &= ~0x1;
pi->regs[PI_STATUS_REG] |= 0x8;
signal_rcp_interrupt(pi->bus->vr4300, MI_INTR_PI);
return 0;
}
pi->bytes_to_copy = (pi->regs[PI_RD_LEN_REG] & 0xFFFFFF) + 1;
pi->counter = pi->bytes_to_copy / 2 + 100; // Assume ~2 bytes/clock?
pi->regs[PI_STATUS_REG] |= 0x9; // I'm busy!
pi->is_dma_read = true;
}
}
return 0;
}
// Writes a word to the AI MMIO register space.
int write_ai_regs(void *opaque, uint32_t address, uint32_t word, uint32_t dqm) {
struct ai_controller *ai = (struct ai_controller *) opaque;
unsigned offset = address - AI_REGS_BASE_ADDRESS;
enum ai_register reg = (offset >> 2);
debug_mmio_write(ai, ai_register_mnemonics[reg], word, dqm);
if (reg == AI_DRAM_ADDR_REG)
ai->regs[AI_DRAM_ADDR_REG] = word & 0xFFFFF8;
else if (reg == AI_LEN_REG) {
ai->regs[AI_LEN_REG] = word & 0x3FFF8;
if (ai->fifo_count == 2)
return 0;
// Fill the next FIFO entry in the DMA engine.
ai->fifo[ai->fifo_wi].address = ai->regs[AI_DRAM_ADDR_REG];
ai->fifo[ai->fifo_wi].length = ai->regs[AI_LEN_REG];
ai->fifo_wi = (ai->fifo_wi == 1) ? 0 : 1;
ai->fifo_count++;
if (ai->fifo_count == 2)
ai->regs[AI_STATUS_REG] |= 0x80000001U;
// If we're not DMA-ing already, start DMA engine.
if (!(ai->regs[AI_STATUS_REG] & 0x40000000U))
ai_dma(ai);
}
else if (reg == AI_STATUS_REG) {
struct bus_controller *bus;
memcpy(&bus, ai, sizeof(bus));
clear_rcp_interrupt(bus->vr4300, MI_INTR_AI);
}
else if (reg == AI_DACRATE_REG) {
ai->regs[AI_DACRATE_REG] = word & 0x3FFF;
ai->ctx.frequency = (double) NTSC_DAC_FREQ /
(ai->regs[AI_DACRATE_REG] + 1);
}
else if (reg == AI_BITRATE_REG)
ai->regs[AI_BITRATE_REG] = word & 0xF;
else
ai->regs[reg] = word;
return 0;
}
// Writes a word to the MI MMIO register space.
int write_mi_regs(void *opaque, uint32_t address, uint32_t word, uint32_t dqm) {
struct vr4300 *vr4300 = (struct vr4300 *) opaque;
uint32_t offset = address - MI_REGS_BASE_ADDRESS;
enum mi_register reg = (offset >> 2);
uint32_t result;
debug_mmio_write(mi, mi_register_mnemonics[reg], word, dqm);
// Change mode settings?
if (reg == MI_INIT_MODE_REG) {
result = word & 0x3FF;
if (word & 0x0080)
result &= ~MI_INIT_MODE;
else if (word & 0x0100)
result |= MI_INIT_MODE;
if (word & 0x0200)
result &= ~MI_EBUS_TEST_MODE;
else if (word & 0x0400)
result |= MI_EBUS_TEST_MODE;
if (word & 0x0800) {
vr4300->mi_regs[MI_INTR_REG] &= ~MI_INTR_DP;
check_for_interrupts(vr4300); // TODO/FIXME: ???
}
if (word & 0x1000)
result &= ~MI_RDRAM_REG_MODE;
else if (word & 0x2000)
result |= MI_RDRAM_REG_MODE;
vr4300->mi_regs[MI_INIT_MODE_REG] = result;
}
// Change interrupt mask?
else if (reg == MI_INTR_MASK_REG) {
if (word & 0x0001)
vr4300->mi_regs[MI_INTR_MASK_REG] &= ~MI_INTR_SP;
else if (word & 0x0002)
vr4300->mi_regs[MI_INTR_MASK_REG] |= MI_INTR_SP;
if (word & 0x0004)
vr4300->mi_regs[MI_INTR_MASK_REG] &= ~MI_INTR_SI;
else if (word & 0x0008)
vr4300->mi_regs[MI_INTR_MASK_REG] |= MI_INTR_SI;
if (word & 0x0010)
vr4300->mi_regs[MI_INTR_MASK_REG] &= ~MI_INTR_AI;
else if (word & 0x0020)
vr4300->mi_regs[MI_INTR_MASK_REG] |= MI_INTR_AI;
if (word & 0x0040)
vr4300->mi_regs[MI_INTR_MASK_REG] &= ~MI_INTR_VI;
else if (word & 0x0080)
vr4300->mi_regs[MI_INTR_MASK_REG] |= MI_INTR_VI;
if (word & 0x0100)
vr4300->mi_regs[MI_INTR_MASK_REG] &= ~MI_INTR_PI;
else if (word & 0x0200)
vr4300->mi_regs[MI_INTR_MASK_REG] |= MI_INTR_PI;
if (word & 0x0400)
vr4300->mi_regs[MI_INTR_MASK_REG] &= ~MI_INTR_DP;
else if (word & 0x0800)
vr4300->mi_regs[MI_INTR_MASK_REG] |= MI_INTR_DP;
check_for_interrupts(vr4300); // TODO/FIXME: ???
}
else {
vr4300->mi_regs[reg] &= ~dqm;
vr4300->mi_regs[reg] |= word;
}
return 0;
}