181 lines
7.0 KiB
C++
181 lines
7.0 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-22 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/** @file Constructs the Gossamer machine.
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Author: Max Poliakovski
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*/
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#include <cpu/ppc/ppcemu.h>
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#include <devices/common/i2c/athens.h>
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#include <devices/common/i2c/i2cprom.h>
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#include <devices/common/machineid.h>
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#include <devices/floppy/floppyimg.h>
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#include <devices/ioctrl/macio.h>
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#include <devices/memctrl/mpc106.h>
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#include <devices/memctrl/spdram.h>
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#include <devices/sound/soundserver.h>
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#include <devices/video/atirage.h>
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#include <loguru.hpp>
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#include <machines/machinebase.h>
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#include <machines/machinefactory.h>
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#include <machines/machineproperties.h>
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#include <cinttypes>
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#include <memory>
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#include <string>
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// Bit definitions for the Gossamer system register at 0xFF000004
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enum : uint16_t {
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FDC_TYPE_SWIM3 = (1 << 15), // Macintosh style floppy disk controller
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FDC_TYPE_MFDC = (0 << 15), // PC style floppy disk controller
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BURST_ROM_FALSE = (1 << 14), // burst ROM not present
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BURST_ROM_TRUE = (0 << 14), // burst ROM present
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PCI_C_PRSNT_POS = 12, // PRSNT bits for the PCI Slot C
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PCI_B_PRSNT_POS = 10, // PRSNT bits for the PCI Slot B
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PCI_A_PRSNT_POS = 8, // PRSNT bits for the PCI Slot A
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PCM_PID_POS = 5, // Processor und Cache module ID
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PCM_PID_MASK = 0xE0,
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AIO_PRSNT_FALSE = (1 << 4), // Whisper/Wings style card in the PERCH slot
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AIO_PRSNT_TRUE = (0 << 4), // All-in-one style card in the PERCH slot
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BUS_SPEED_POS = 1, // bus speed code, see below
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BUS_SPEED_MASK = 0x0E,
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UNKNOWN_BIT_0 = 1 // Don't know what this bit is for
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};
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// Gossamer bus speed frequency codes
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enum : uint8_t {
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BUS_FREQ_75P00A = 0, // 75.00 MHz
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BUS_FREQ_70P00 = 1, // 70.00 MHz
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BUS_FREQ_78P75 = 2, // 78.75 MHz
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BUS_FREQ_TRI = 3, // clock output tristated
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BUS_FREQ_75P00B = 4, // 75.00 MHz
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BUS_FREQ_60P00 = 5, // 60.00 MHz
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BUS_FREQ_66P82 = 6, // 66.82 MHz
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BUS_FREQ_83P00 = 7, // 83.00 MHz
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};
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// EEPROM ID content for a Whisper personality card.
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const uint8_t WhisperID[16] = {
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0x0F, 0xAA, 0x55, 0xAA, 0x57, 0x68, 0x69, 0x73, 0x70, 0x65, 0x72, 0x00,
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0x00, 0x00, 0x00, 0x02
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};
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static void setup_ram_slot(std::string name, int i2c_addr, int capacity_megs) {
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if (!capacity_megs)
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return;
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gMachineObj->add_device(name, std::unique_ptr<SpdSdram168>(new SpdSdram168(i2c_addr)));
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SpdSdram168* ram_dimm = dynamic_cast<SpdSdram168*>(gMachineObj->get_comp_by_name(name));
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ram_dimm->set_capacity(capacity_megs);
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// register RAM DIMM with the I2C bus
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I2CBus* i2c_bus = dynamic_cast<I2CBus*>(gMachineObj->get_comp_by_type(HWCompType::I2C_HOST));
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i2c_bus->register_device(i2c_addr, ram_dimm);
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}
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int initialize_gossamer(std::string& id)
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{
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LOG_F(INFO, "Building machine Gossamer...");
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// get pointer to the memory controller/PCI host bridge object
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MPC106* grackle_obj = dynamic_cast<MPC106*>(gMachineObj->get_comp_by_name("Grackle"));
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// configure the Gossamer system register
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uint16_t sys_reg = FDC_TYPE_SWIM3 | BURST_ROM_TRUE
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| (0x3F << PCI_A_PRSNT_POS) // pull up all PRSNT bits
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| (1 << PCM_PID_POS) // CPU/Cache speed ratio = 2:1
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| AIO_PRSNT_FALSE // this machine is not All-in-one
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| (BUS_FREQ_66P82 << BUS_SPEED_POS) // set bus frequency
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| UNKNOWN_BIT_0; // pull up bit 0
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gMachineObj->add_device("MachineID", std::unique_ptr<GossamerID>(new GossamerID(sys_reg)));
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grackle_obj->add_mmio_region(
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0xFF000000, 4096, dynamic_cast<MMIODevice*>(gMachineObj->get_comp_by_name("MachineID")));
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// allocate ROM region
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if (!grackle_obj->add_rom_region(0xFFC00000, 0x400000)) {
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LOG_F(ERROR, "Could not allocate ROM region!");
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return -1;
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}
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// configure RAM slots
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setup_ram_slot("RAM_DIMM_1", 0x57, GET_INT_PROP("rambank1_size"));
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setup_ram_slot("RAM_DIMM_2", 0x56, GET_INT_PROP("rambank2_size"));
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setup_ram_slot("RAM_DIMM_3", 0x55, GET_INT_PROP("rambank3_size"));
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// add pci devices
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grackle_obj->pci_register_device(
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DEV_FUN(0x10,0), dynamic_cast<PCIDevice*>(gMachineObj->get_comp_by_name("Heathrow")));
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grackle_obj->pci_register_device(
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DEV_FUN(0x12,0), dynamic_cast<PCIDevice*>(gMachineObj->get_comp_by_name(id == "pmg3twr" ? "AtiRagePro" : "AtiRageGT")));
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// add Athens clock generator device and register it with the I2C host
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gMachineObj->add_device("Athens", std::unique_ptr<AthensClocks>(new AthensClocks(0x28)));
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I2CBus* i2c_bus = dynamic_cast<I2CBus*>(gMachineObj->get_comp_by_type(HWCompType::I2C_HOST));
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i2c_bus->register_device(0x28, dynamic_cast<I2CDevice*>(gMachineObj->get_comp_by_name("Athens")));
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// create ID EEPROM for the Whisper personality card and register it with the I2C host
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gMachineObj->add_device("Perch", std::unique_ptr<I2CProm>(new I2CProm(0x53, 256)));
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I2CProm* perch_id = dynamic_cast<I2CProm*>(gMachineObj->get_comp_by_name("Perch"));
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perch_id->fill_memory(0, 256, 0);
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perch_id->fill_memory(32, 223, 0xFF);
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perch_id->set_memory(0, WhisperID, sizeof(WhisperID));
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i2c_bus->register_device(0x53, perch_id);
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// configure CPU clocks
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uint64_t bus_freq = 66820000ULL;
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uint64_t timebase_freq = bus_freq / 4;
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// initialize virtual CPU and request MPC750 CPU aka G3
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ppc_cpu_init(grackle_obj, PPC_VER::MPC750, timebase_freq);
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// set CPU PLL ratio to 3.5
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ppc_state.spr[SPR::HID1] = 0xE << 28;
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return 0;
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}
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static const PropMap gossamer_settings = {
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{"rambank1_size",
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new IntProperty(256, vector<uint32_t>({8, 16, 32, 64, 128, 256}))},
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{"rambank2_size",
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new IntProperty( 0, vector<uint32_t>({0, 8, 16, 32, 64, 128, 256}))},
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{"rambank3_size",
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new IntProperty( 0, vector<uint32_t>({0, 8, 16, 32, 64, 128, 256}))},
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{"emmo",
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new BinProperty(0)},
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};
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static vector<string> pmg3_devices = {
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"Grackle", "Heathrow", "AtiRageGT"
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};
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static const MachineDescription pmg3dt_descriptor = {
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.name = "pmg3dt",
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.description = "Power Macintosh G3 (Beige) Desktop",
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.devices = pmg3_devices,
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.settings = gossamer_settings,
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.init_func = &initialize_gossamer
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};
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REGISTER_MACHINE(pmg3dt, pmg3dt_descriptor);
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