/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-24 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see .
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
GrandCentral::GrandCentral() : PCIDevice("mac-io/grandcentral"), InterruptCtrl()
{
supports_types(HWCompType::MMIO_DEV | HWCompType::PCI_DEV | HWCompType::INT_CTRL);
// populate my PCI config header
this->vendor_id = PCI_VENDOR_APPLE;
this->device_id = 0x0002;
this->class_rev = 0xFF000002;
this->cache_ln_sz = 8;
this->setup_bars({{0, 0xFFFE0000UL}}); // declare 128Kb of memory-mapped I/O space
this->pci_notify_bar_change = [this](int bar_num) {
this->notify_bar_change(bar_num);
};
// NVRAM connection
this->nvram = dynamic_cast(gMachineObj->get_comp_by_name("NVRAM"));
// connect Cuda
this->viacuda = dynamic_cast(gMachineObj->get_comp_by_name("ViaCuda"));
// initialize sound chip and its DMA output channel, then wire them together
this->awacs = std::unique_ptr (new AwacsScreamer());
this->snd_out_dma = std::unique_ptr (new DMAChannel());
this->awacs->set_dma_out(this->snd_out_dma.get());
this->snd_out_dma->set_callbacks(
std::bind(&AwacsScreamer::dma_out_start, this->awacs.get()),
std::bind(&AwacsScreamer::dma_out_stop, this->awacs.get())
);
// connect serial HW
this->escc = dynamic_cast(gMachineObj->get_comp_by_name("Escc"));
// connect SCSI HW
this->scsi_0 = dynamic_cast(gMachineObj->get_comp_by_name("Sc53C94"));
// connect Ethernet HW
this->mace = dynamic_cast(gMachineObj->get_comp_by_name("Mace"));
// connect floppy disk HW
this->swim3 = dynamic_cast(gMachineObj->get_comp_by_name("Swim3"));
this->floppy_dma = std::unique_ptr (new DMAChannel());
this->swim3->set_dma_channel(this->floppy_dma.get());
}
void GrandCentral::notify_bar_change(int bar_num)
{
if (bar_num) // only BAR0 is supported
return;
if (this->base_addr != (this->bars[bar_num] & 0xFFFFFFF0UL)) {
if (this->base_addr) {
LOG_F(WARNING, "GC: deallocating I/O memory not implemented");
}
this->base_addr = this->bars[0] & 0xFFFFFFF0UL;
this->host_instance->pci_register_mmio_region(this->base_addr, 0x20000, this);
LOG_F(INFO, "%s: base address set to 0x%X", this->pci_name.c_str(), this->base_addr);
}
}
uint32_t GrandCentral::read(uint32_t rgn_start, uint32_t offset, int size)
{
if (offset & 0x10000) { // Device register space
unsigned subdev_num = (offset >> 12) & 0xF;
switch (subdev_num) {
case 0: // Curio SCSI
return this->scsi_0->read((offset >> 4) & 0xF);
case 1: // MACE
return this->mace->read((offset >> 4) & 0x1F);
case 2: // ESCC compatible addressing
if ((offset & 0xFF) < 16) {
return this->escc->read(compat_to_macrisc[(offset >> 1) & 0xF]);
}
// fallthrough
case 3: // ESCC MacRISC addressing
return this->escc->read((offset >> 4) & 0xF);
case 4: // AWACS
return this->awacs->snd_ctrl_read(offset & 0xFF, size);
case 5: // SWIM3
return this->swim3->read((offset >> 4) & 0xF);
case 6:
case 7: // VIA-CUDA
return this->viacuda->read((offset >> 9) & 0xF);
case 0xA: // IOBus dev #1
case 0xB: // IOBus dev #2
case 0xC: // IOBus dev #3
case 0xE: // IOBus dev #5
if (this->iobus_devs[subdev_num - 10] != nullptr) {
uint32_t result = this->iobus_devs[subdev_num - 10]->iodev_read(
(offset >> 4) & 0x1F);
result &= 0xFFFFFFFFUL >> (4 - size) * 8; // strip unused bits
return BYTESWAP_SIZED(result, size);
} else {
LOG_F(ERROR, "GC: IOBus device #%d doesn't exist", subdev_num - 9);
return 0;
}
break;
case 0xF: // NVRAM Data (IOBus dev #6)
return this->nvram->read_byte(
(this->nvram_addr_hi << 5) + ((offset >> 4) & 0x1F));
}
} else if (offset & 0x8000) { // DMA register space
unsigned subdev_num = (offset >> 8) & 0xF;
switch (subdev_num) {
case 1:
return this->floppy_dma->reg_read(offset & 0xFF, size);
case 8:
return this->snd_out_dma->reg_read(offset & 0xFF, size);
default:
LOG_F(WARNING, "GC: unimplemented DMA register at 0x%X",
this->base_addr + offset);
}
} else { // Interrupt related registers
switch (offset) {
case MIO_INT_EVENTS1:
return BYTESWAP_32(this->int_events);
case MIO_INT_MASK1:
return BYTESWAP_32(this->int_mask);
case MIO_INT_CLEAR1:
// some Mac OS drivers reads from this write-only register
// so we return zero here as real HW does
return 0;
case MIO_INT_LEVELS1:
return BYTESWAP_32(this->int_levels);
}
}
LOG_F(WARNING, "GC: reading from unmapped I/O memory 0x%X", this->base_addr + offset);
return 0;
}
void GrandCentral::write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size)
{
if (offset & 0x10000) { // Device register space
unsigned subdev_num = (offset >> 12) & 0xF;
switch (subdev_num) {
case 0: // Curio SCSI
this->scsi_0->write((offset >> 4) & 0xF, value);
break;
case 1: // MACE registers
this->mace->write((offset >> 4) & 0x1F, value);
break;
case 2: // ESCC compatible addressing
if ((offset & 0xFF) < 16) {
this->escc->write(compat_to_macrisc[(offset >> 1) & 0xF], value);
break;
}
// fallthrough
case 3: // ESCC MacRISC addressing
this->escc->write((offset >> 4) & 0xF, value);
break;
case 4: // AWACS
this->awacs->snd_ctrl_write(offset & 0xFF, value, size);
break;
case 5:
this->swim3->write((offset >> 4) & 0xF, value);
break;
case 6:
case 7: // VIA-CUDA
this->viacuda->write((offset >> 9) & 0xF, value);
break;
case 0xA: // IOBus dev #1
case 0xB: // IOBus dev #2
case 0xC: // IOBus dev #3
case 0xE: // IOBus dev #5
if (this->iobus_devs[subdev_num - 10] != nullptr) {
this->iobus_devs[subdev_num - 10]->iodev_write(
(offset >> 4) & 0x1F, value);
} else {
LOG_F(ERROR, "GC: IOBus device #%d doesn't exist", subdev_num - 9);
}
break;
case 0xD: // NVRAM High Address (IOBus dev #4)
switch (size) {
case 4:
this->nvram_addr_hi = BYTESWAP_32(value);
break;
case 2:
this->nvram_addr_hi = BYTESWAP_16(value);
break;
default:
this->nvram_addr_hi = value;
}
break;
case 0xF: // NVRAM Data (IOBus dev #6)
this->nvram->write_byte(
(this->nvram_addr_hi << 5) + ((offset >> 4) & 0x1F), value);
break;
default:
LOG_F(WARNING, "GC: writing to unmapped I/O memory 0x%X",
this->base_addr + offset);
}
} else if (offset & 0x8000) { // DMA register space
unsigned subdev_num = (offset >> 8) & 0xF;
switch (subdev_num) {
case 1:
this->floppy_dma->reg_write(offset & 0xFF, value, size);
break;
case 8:
this->snd_out_dma->reg_write(offset & 0xFF, value, size);
break;
default:
LOG_F(WARNING, "GC: unimplemented DMA register at 0x%X",
this->base_addr + offset);
}
} else { // Interrupt related registers
switch (offset) {
case MIO_INT_MASK1:
this->int_mask = BYTESWAP_32(value);
break;
case MIO_INT_CLEAR1:
if ((this->int_mask & MACIO_INT_MODE) && (value & MACIO_INT_CLR))
this->int_events = 0;
else
this->int_events &= ~(BYTESWAP_32(value) & 0x7FFFFFFFUL);
clear_cpu_int();
break;
case MIO_INT_LEVELS1:
break; // ignore writes to this read-only register
default:
LOG_F(WARNING, "GC: writing to unmapped I/O memory 0x%X",
this->base_addr + offset);
}
}
}
void GrandCentral::attach_iodevice(int dev_num, IobusDevice* dev_obj)
{
if (dev_num >= 0 && dev_num < 6) {
this->iobus_devs[dev_num] = dev_obj;
}
}
uint32_t GrandCentral::register_dev_int(IntSrc src_id) {
switch (src_id) {
case IntSrc::VIA_CUDA:
return 1 << 18;
case IntSrc::SCSI1:
return 1 << 12;
case IntSrc::SWIM3:
return 1 << 19;
default:
ABORT_F("%s: unknown interrupt source %d", this->name.c_str(), src_id);
}
return 0;
}
uint32_t GrandCentral::register_dma_int(IntSrc src_id) {
switch (src_id) {
case IntSrc::DMA_SCSI_CURIO: return 1 << 0;
case IntSrc::DMA_SWIM3: return 1 << 1;
case IntSrc::DMA_SCSI_MESH: return 1 << 10;
default:
ABORT_F("%s: unknown DMA interrupt source %d", this->name.c_str(), src_id);
}
return 0;
}
void GrandCentral::ack_int_common(uint32_t irq_id, uint8_t irq_line_state) {
// native mode: set IRQ bits in int_events1 on a 0-to-1 transition
// emulated mode: set IRQ bits in int_events1 on all transitions
if ((this->int_mask & MACIO_INT_MODE) ||
(irq_line_state && !(this->int_levels & irq_id))) {
this->int_events |= irq_id;
} else {
this->int_events &= ~irq_id;
}
this->int_events &= this->int_mask;
// update IRQ line state
if (irq_line_state) {
this->int_levels |= irq_id;
} else {
this->int_levels &= ~irq_id;
}
this->signal_cpu_int(irq_id);
}
void GrandCentral::ack_int(uint32_t irq_id, uint8_t irq_line_state) {
this->ack_int_common(irq_id, irq_line_state);
}
void GrandCentral::ack_dma_int(uint32_t irq_id, uint8_t irq_line_state) {
this->ack_int_common(irq_id, irq_line_state);
}
void GrandCentral::signal_cpu_int(uint32_t irq_id) {
if (this->int_events) {
if (!this->cpu_int_latch) {
this->cpu_int_latch = true;
ppc_assert_int();
LOG_F(5, "GC: CPU INT asserted, source: %d", irq_id);
} else {
LOG_F(5, "GC: CPU INT already latched");
}
}
}
void GrandCentral::clear_cpu_int() {
if (!this->int_events) {
this->cpu_int_latch = false;
ppc_release_int();
LOG_F(5, "%s: CPU INT latch cleared", this->name.c_str());
}
}
static const vector GCSubdevices = {
"NVRAM", "ViaCuda", "Escc", "Scsi0", "Sc53C94", "Mace", "Swim3"
};
static const DeviceDescription GC_Descriptor = {
GrandCentral::create, GCSubdevices, {}
};
REGISTER_DEVICE(GrandCentral, GC_Descriptor);