dingusppc/devices/common/scsi/ncr53c94.h
2021-10-26 19:00:04 +02:00

90 lines
2.4 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 NCR 53C94 SCSI controller definitions. */
/* NOTE: Power Macintosh computers don't have a real NCR 53C94 chip.
The corresponding functionality is provided by the 53C94 compatible
cell in the custom Curio IC (Am79C950).
*/
#ifndef NCR53C94_H
#define NCR53C94_H
#include <cinttypes>
/** NCR 53C94 read registers */
namespace Read {
enum Reg53C94 : uint8_t {
Xfer_Cnt_LSB = 0,
Xfer_Cnt_MSB = 1,
FIFO = 2,
Command = 3,
Status = 4,
Interrupt = 5,
Seq_Step = 6,
FIFO_Flags = 7,
Config_1 = 8,
Config_2 = 0xB,
Config_3 = 0xC,
Config_4 = 0xD, // Curio extension?
Xfer_Cnt_Hi = 0xE, // Curio extension?
DMA = 0xF, // Curio extension?
};
};
/** NCR 53C94 write registers */
namespace Write {
enum Reg53C94 : uint8_t {
Xfer_Cnt_LSB = 0,
Xfer_Cnt_MSB = 1,
FIFO = 2,
Command = 3,
Dest_Bus_ID = 4,
Sel_Timeout = 5,
Synch_Period = 6,
Synch_Offset = 7,
Config_1 = 8,
Clk_Conv_Fac = 9,
Test_Mode = 0xA,
Config_2 = 0xB,
Config_3 = 0xC,
Config_4 = 0xD, // Curio extension?
Chip_ID = 0xE, // Curio extension?
DMA = 0xF, // Curio extension?
};
};
class Ncr53C94 {
public:
Ncr53C94() = default;
~Ncr53C94() = default;
// NCR 53C94 registers access
uint8_t read(uint8_t reg_offset);
void write(uint8_t reg_offset, uint8_t value);
private:
uint8_t chip_id;
};
#endif // NCR53C94_H