mirror of
https://github.com/dingusdev/dingusppc.git
synced 2024-08-28 05:29:15 +00:00
128 lines
3.2 KiB
C++
128 lines
3.2 KiB
C++
/*
|
|
DingusPPC - The Experimental PowerPC Macintosh emulator
|
|
Copyright (C) 2018-21 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 <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/** @file Sander-Wozniak Machine 3 (SWIM3) definitions. */
|
|
|
|
#ifndef SWIM3_H
|
|
#define SWIM3_H
|
|
|
|
#include <devices/common/dmacore.h>
|
|
#include <devices/common/hwcomponent.h>
|
|
#include <devices/common/hwinterrupt.h>
|
|
#include <devices/floppy/superdrive.h>
|
|
|
|
#include <cinttypes>
|
|
#include <memory>
|
|
|
|
/** SWIM3 registers offsets. */
|
|
namespace Swim3 {
|
|
|
|
enum Swim3Reg : uint8_t {
|
|
Data = 0,
|
|
Timer = 1,
|
|
Error = 2,
|
|
Param_Data = 3,
|
|
Phase = 4,
|
|
Setup = 5,
|
|
Status_Mode0 = 6, // read: Status, write: zeroes to the mode register
|
|
Handshake_Mode1 = 7, // read: Handshake, write: ones to the mode register
|
|
Interrupt_Flags = 8,
|
|
Step = 9,
|
|
Current_Track = 10,
|
|
Current_Sector = 11,
|
|
Gap_Format = 12,
|
|
First_Sector = 13,
|
|
Sectors_To_Xfer = 14,
|
|
Interrupt_Mask = 15
|
|
};
|
|
|
|
/** Mode register bits. */
|
|
enum {
|
|
SWIM3_INT_ENA = 0x01,
|
|
SWIM3_GO = 0x08,
|
|
SWIM3_WR_MODE = 0x10,
|
|
SWIM3_GO_STEP = 0x80,
|
|
};
|
|
|
|
/** Interrupt flags. */
|
|
enum {
|
|
INT_STEP_DONE = 0x02,
|
|
INT_ID_READ = 0x04,
|
|
INT_SECT_DONE = 0x08,
|
|
};
|
|
|
|
class Swim3Ctrl : public HWComponent {
|
|
public:
|
|
Swim3Ctrl();
|
|
~Swim3Ctrl() = default;
|
|
|
|
int device_postinit();
|
|
|
|
// SWIM3 registers access
|
|
uint8_t read(uint8_t reg_offset);
|
|
void write(uint8_t reg_offset, uint8_t value);
|
|
|
|
void set_dma_channel(DmaBidirChannel *dma_ch) {
|
|
this->dma_ch = dma_ch;
|
|
};
|
|
|
|
protected:
|
|
void update_irq();
|
|
void start_stepping();
|
|
void do_step();
|
|
void stop_stepping();
|
|
void start_disk_access();
|
|
void stop_disk_access();
|
|
|
|
private:
|
|
std::unique_ptr<MacSuperdrive::MacSuperDrive> int_drive;
|
|
|
|
DmaBidirChannel* dma_ch;
|
|
|
|
uint8_t setup_reg;
|
|
uint8_t mode_reg;
|
|
uint8_t error;
|
|
uint8_t phase_lines;
|
|
uint8_t int_reg;
|
|
uint8_t int_flags; // interrupt flags
|
|
uint8_t int_mask;
|
|
uint8_t pram; // parameter RAM: two nibbles = {late_time, early_time}
|
|
uint8_t step_count;
|
|
uint8_t cur_track;
|
|
uint8_t cur_sector;
|
|
uint8_t format; // format byte from the last GCR/MFM address field
|
|
uint8_t first_sec;
|
|
uint8_t xfer_cnt;
|
|
uint8_t gap_size;
|
|
|
|
int step_timer_id = 0;
|
|
int access_timer_id = 0;
|
|
|
|
// Interrupt related stuff
|
|
InterruptCtrl* int_ctrl = nullptr;
|
|
uint32_t irq_id = 0;
|
|
uint8_t irq = 0;
|
|
};
|
|
|
|
}; // namespace Swim3
|
|
|
|
#endif // SWIM3_H
|