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SWIM3: track seeking and header reading.
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@ -43,6 +43,7 @@ Swim3Ctrl::Swim3Ctrl()
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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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@ -64,9 +65,13 @@ int Swim3Ctrl::device_postinit()
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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;
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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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@ -82,6 +87,16 @@ uint8_t Swim3Ctrl::read(uint8_t reg_offset)
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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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@ -118,7 +133,7 @@ void Swim3Ctrl::write(uint8_t reg_offset, uint8_t value)
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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_action();
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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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@ -129,7 +144,7 @@ void Swim3Ctrl::write(uint8_t reg_offset, uint8_t value)
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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_action();
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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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@ -137,6 +152,15 @@ void Swim3Ctrl::write(uint8_t reg_offset, uint8_t value)
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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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@ -176,6 +200,16 @@ void Swim3Ctrl::start_stepping()
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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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@ -208,11 +242,54 @@ void Swim3Ctrl::stop_stepping()
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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_action()
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void Swim3Ctrl::start_disk_access()
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{
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LOG_F(INFO, "SWIM3: action started!");
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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_action()
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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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@ -56,12 +56,14 @@ enum Swim3Reg : uint8_t {
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/** Mode register bits. */
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enum {
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SWIM3_GO = 0x08,
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SWIM3_WR_MODE = 0x10,
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SWIM3_GO_STEP = 0x80,
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};
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/** Interrupt flags. */
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enum {
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INT_STEP_DONE = 0x02,
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INT_ID_READ = 0x04,
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};
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class Swim3Ctrl : public HWComponent {
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@ -80,24 +82,30 @@ protected:
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void start_stepping();
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void do_step();
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void stop_stepping();
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void start_action();
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void stop_action();
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void start_disk_access();
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void stop_disk_access();
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private:
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std::unique_ptr<MacSuperdrive::MacSuperDrive> int_drive;
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uint8_t setup_reg;
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uint8_t mode_reg;
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uint8_t error;
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uint8_t phase_lines;
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uint8_t int_reg;
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uint8_t int_flags; // interrupt flags
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uint8_t int_mask;
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uint8_t pram; // parameter RAM: two nibbles = {late_time, early_time}
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uint8_t step_count;
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uint8_t cur_track;
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uint8_t cur_sector;
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uint8_t format; // format byte from the last GCR/MFM address field
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uint8_t first_sec;
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uint8_t xfer_cnt;
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uint8_t gap_size;
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int step_timer_id = 0;
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int step_timer_id = 0;
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int access_timer_id = 0;
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// Interrupt related stuff
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InterruptCtrl* int_ctrl = nullptr;
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