mirror of
https://github.com/dingusdev/dingusppc.git
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298 lines
9.0 KiB
C++
298 lines
9.0 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 Sander-Wozniak Machine 3 (SWIM3) emulation. */
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#include <core/timermanager.h>
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#include <devices/common/hwinterrupt.h>
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#include <devices/floppy/superdrive.h>
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#include <devices/floppy/swim3.h>
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#include <loguru.hpp>
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#include <machines/machinebase.h>
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#include <cinttypes>
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#include <memory>
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using namespace Swim3;
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Swim3Ctrl::Swim3Ctrl()
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{
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this->name = "SWIM3";
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this->supported_types = HWCompType::FLOPPY_CTRL;
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this->setup_reg = 0;
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this->mode_reg = 0;
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this->int_reg = 0;
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this->int_flags = 0;
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this->int_mask = 0;
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this->error = 0;
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this->xfer_cnt = 0;
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this->first_sec = 0xFF;
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// Attach virtual Superdrive to the internal drive connector
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// TODO: make SWIM3/drive wiring user selectable
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this->int_drive = std::unique_ptr<MacSuperdrive::MacSuperDrive>
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(new MacSuperdrive::MacSuperDrive());
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gMachineObj->add_subdevice("Superdrive", this->int_drive.get());
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}
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int Swim3Ctrl::device_postinit()
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{
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this->int_ctrl = dynamic_cast<InterruptCtrl*>(
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gMachineObj->get_comp_by_type(HWCompType::INT_CTRL));
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this->irq_id = this->int_ctrl->register_dev_int(IntSrc::SWIM3);
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return 0;
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};
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uint8_t Swim3Ctrl::read(uint8_t reg_offset)
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{
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uint8_t status_addr, old_int_flags, old_error;
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switch(reg_offset) {
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case Swim3Reg::Error:
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old_error = this->error;
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this->error = 0;
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return old_error;
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case Swim3Reg::Phase:
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return this->phase_lines;
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case Swim3Reg::Setup:
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return this->setup_reg;
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case Swim3Reg::Handshake_Mode1:
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if (this->mode_reg & 2) { // internal drive?
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status_addr = ((this->mode_reg & 0x20) >> 2) | (this->phase_lines & 7);
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return ((this->int_drive->status(status_addr) & 1) << 2);
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}
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return 4;
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case Swim3Reg::Interrupt_Flags:
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old_int_flags = this->int_flags;
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this->int_flags = 0; // read from this register clears all flags
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update_irq();
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return old_int_flags;
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case Swim3Reg::Current_Track:
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return this->cur_track;
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case Swim3Reg::Current_Sector:
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return this->cur_sector;
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case Swim3Reg::Gap_Format:
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return this->format;
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case Swim3Reg::First_Sector:
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return this->first_sec;
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case Swim3Reg::Sectors_To_Xfer:
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return this->xfer_cnt;
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case Swim3Reg::Interrupt_Mask:
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return this->int_mask;
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default:
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LOG_F(INFO, "SWIM3: reading from 0x%X register", reg_offset);
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}
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return 0;
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}
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void Swim3Ctrl::write(uint8_t reg_offset, uint8_t value)
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{
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uint8_t old_mode_reg;
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switch(reg_offset) {
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case Swim3Reg::Param_Data:
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this->pram = value;
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break;
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case Swim3Reg::Phase:
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this->phase_lines = value & 0xF;
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if (value & 8) {
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if (this->mode_reg & 2) { // internal drive?
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this->int_drive->command(
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((this->mode_reg & 0x20) >> 3) | (this->phase_lines & 3),
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(value >> 2) & 1
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);
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}
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}
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break;
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case Swim3Reg::Setup:
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this->setup_reg = value;
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break;
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case Swim3Reg::Status_Mode0:
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// ones in value clear the corresponding bits in the mode register
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if ((this->mode_reg & value) & (SWIM3_GO | SWIM3_GO_STEP)) {
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if (value & SWIM3_GO_STEP) {
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stop_stepping();
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} else {
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stop_disk_access();
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}
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}
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this->mode_reg &= ~value;
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break;
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case Swim3Reg::Handshake_Mode1:
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// ones in value set the corresponding bits in the mode register
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if ((this->mode_reg ^ value) & (SWIM3_GO | SWIM3_GO_STEP)) {
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if (value & SWIM3_GO_STEP) {
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start_stepping();
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} else {
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start_disk_access();
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}
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}
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this->mode_reg |= value;
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break;
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case Swim3Reg::Step:
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this->step_count = value;
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break;
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case Swim3Reg::Gap_Format:
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this->gap_size = value;
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break;
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case Swim3Reg::First_Sector:
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this->first_sec = value;
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break;
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case Swim3Reg::Sectors_To_Xfer:
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this->xfer_cnt = value;
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break;
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case Swim3Reg::Interrupt_Mask:
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this->int_mask = value;
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break;
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default:
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LOG_F(INFO, "SWIM3: writing 0x%X to register 0x%X", value, reg_offset);
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}
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}
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void Swim3Ctrl::update_irq()
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{
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if (this->mode_reg & SWIM3_INT_ENA) {
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uint8_t new_irq = !!(this->int_flags & this->int_mask);
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if (new_irq != this->irq) {
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this->irq = new_irq;
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this->int_ctrl->ack_int(this->irq_id, new_irq);
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}
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}
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}
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void Swim3Ctrl::do_step()
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{
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if (this->mode_reg & SWIM3_GO_STEP && this->step_count) { // are we still stepping?
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// instruct the drive to perform single step in current direction
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this->int_drive->command(MacSuperdrive::CommandAddr::Do_Step, 0);
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if (--this->step_count == 0) {
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if (this->step_timer_id) {
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this->stop_stepping();
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}
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this->int_flags |= INT_STEP_DONE;
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update_irq();
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}
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}
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}
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void Swim3Ctrl::start_stepping()
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{
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if (!this->step_count) {
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LOG_F(WARNING, "SWIM3: step_count is zero while go_step is active!");
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return;
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}
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if (this->mode_reg & SWIM3_GO_STEP || this->step_timer_id) {
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LOG_F(ERROR, "SWIM3: another stepping action is running!");
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return;
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}
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if (this->mode_reg & SWIM3_GO || this->access_timer_id) {
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LOG_F(ERROR, "SWIM3: stepping attempt while disk access is in progress!");
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return;
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}
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if ((((this->mode_reg & 0x20) >> 3) | (this->phase_lines & 3))
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!= MacSuperdrive::CommandAddr::Do_Step) {
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LOG_F(WARNING, "SWIM3: invalid command address on the phase lines!");
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return;
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}
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this->mode_reg |= SWIM3_GO_STEP;
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// step count > 1 requires periodic task
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if (this->step_count > 1) {
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this->step_timer_id = TimerManager::get_instance()->add_cyclic_timer(
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USECS_TO_NSECS(80),
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[this]() {
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this->do_step();
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}
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);
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}
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// perform the first step immediately
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do_step();
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}
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void Swim3Ctrl::stop_stepping()
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{
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// cancel stepping task
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if (this->step_timer_id) {
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TimerManager::get_instance()->cancel_timer(this->step_timer_id);
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}
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this->step_timer_id = 0;
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this->step_count = 0; // not sure this one is required
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}
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void Swim3Ctrl::start_disk_access()
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{
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if (this->mode_reg & SWIM3_GO || this->access_timer_id) {
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LOG_F(ERROR, "SWIM3: another disk access is running!");
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return;
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}
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if (this->mode_reg & SWIM3_GO_STEP || this->step_timer_id) {
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LOG_F(ERROR, "SWIM3: disk access attempt while stepping is in progress!");
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return;
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}
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if (this->mode_reg & SWIM3_WR_MODE) {
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LOG_F(ERROR, "SWIM3: writing not implemented yet");
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return;
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}
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this->mode_reg |= SWIM3_GO;
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LOG_F(INFO, "SWIM3: disk access started!");
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if (this->first_sec == 0xFF) {
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// $FF means no sector to match ->
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// generate ID_read interrups as long as the GO bit is set
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this->int_drive->init_track_search(-1); // start at random sector
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this->access_timer_id = TimerManager::get_instance()->add_cyclic_timer(
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static_cast<uint64_t>(this->int_drive->get_sector_delay() * NS_PER_SEC + 0.5f),
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[this]() {
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// get next sector's address field
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MacSuperdrive::SectorHdr addr = this->int_drive->next_sector_header();
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// set up the corresponding SWIM3 registers
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this->cur_track = ((addr.side & 1) << 7) | (addr.track & 0x7F);
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this->cur_sector = 0x80 /* CRC/checksum valid */ | (addr.sector & 0x7F);
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this->format = addr.format;
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// generate ID_read interrupt
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this->int_flags |= INT_ID_READ;
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update_irq();
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}
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);
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} else {
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LOG_F(ERROR, "SWIM3: unsupported first_sec value 0x%X", this->first_sec);
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}
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}
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void Swim3Ctrl::stop_disk_access()
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{
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// cancel disk access timer
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if (this->access_timer_id) {
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TimerManager::get_instance()->cancel_timer(this->access_timer_id);
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}
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this->access_timer_id = 0;
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}
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