131 lines
3.5 KiB
C++
131 lines
3.5 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-23 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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/** PSX Memory Controller emulation. */
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#include <devices/deviceregistry.h>
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#include <devices/memctrl/psx.h>
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#include <loguru.hpp>
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#include <cinttypes>
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#include <string>
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PsxCtrl::PsxCtrl(int bridge_num, std::string name)
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{
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this->name = name;
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supports_types(HWCompType::MEM_CTRL | HWCompType::MMIO_DEV);
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// add MMIO region for the PSX control registers
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add_mmio_region(0xF8000000, 0x70, this);
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this->sys_id = 0x10000000;
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this->chip_rev = 0; // old PSX, what's about PSX+?
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this->sys_config = PSX_BUS_SPEED_50;
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}
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uint32_t PsxCtrl::read(uint32_t rgn_start, uint32_t offset, int size)
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{
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switch (offset >> 3) {
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case PsxReg::Sys_Id:
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return this->sys_id;
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case PsxReg::Revision:
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return this->chip_rev;
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case PsxReg::Sys_Config:
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return this->sys_config;
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default:
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LOG_F(WARNING, "PSX: read from unsupported control register at 0x%X", offset);
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return 0;
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}
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}
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void PsxCtrl::write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size)
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{
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switch (offset >> 3) {
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case PsxReg::Sys_Config:
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this->sys_config = value;
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break;
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case PsxReg::ROM_Config:
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this->rom_cfg = value;
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break;
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case PsxReg::DRAM_Config:
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this->dram_cfg = value;
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break;
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case PsxReg::DRAM_Refresh:
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this->dram_refresh = value;
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break;
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case PsxReg::Flash_Config:
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this->flash_cfg = value;
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break;
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case PsxReg::Page1_Mapping:
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case PsxReg::Page2_Mapping:
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case PsxReg::Page3_Mapping:
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case PsxReg::Page4_Mapping:
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case PsxReg::Page5_Mapping:
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this->pages_cfg[(offset >> 3) - PsxReg::Page1_Mapping] = value;
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break;
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default:
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LOG_F(WARNING, "PSX: write to unsupported/read-only control register at 0x%X", offset);
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};
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}
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void PsxCtrl::insert_ram_dimm(int slot_num, uint32_t capacity)
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{
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if (slot_num < 0 || slot_num >= 5) {
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ABORT_F("PSX: invalid DIMM slot %d", slot_num);
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}
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switch (capacity) {
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case DRAM_CAP_2MB:
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case DRAM_CAP_4MB:
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case DRAM_CAP_8MB:
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case DRAM_CAP_16MB:
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case DRAM_CAP_32MB:
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this->bank_sizes[slot_num] = capacity;
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break;
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default:
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ABORT_F("PSX: unsupported DRAM capacity %d", capacity);
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}
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}
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void PsxCtrl::map_phys_ram()
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{
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uint32_t total_ram = 0;
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for (int i = 0; i < 5; i++) {
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total_ram += this->bank_sizes[i];
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}
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if (total_ram > DRAM_CAP_32MB) {
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ABORT_F("PSX: RAM bigger than 32MB not supported yet");
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}
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if (!add_ram_region(0x00000000, total_ram)) {
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ABORT_F("PSX: could not allocate RAM storage");
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}
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}
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static const DeviceDescription Psx_Descriptor = {
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PsxCtrl::create, {}, {}
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};
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REGISTER_DEVICE(Psx, Psx_Descriptor);
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