dingusppc/devices/common/scsi/mesh.h

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/*
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 MESH (Macintosh Enhanced SCSI Hardware) controller definitions. */
#ifndef MESH_H
#define MESH_H
#include <devices/common/hwcomponent.h>
#include <cinttypes>
#include <memory>
// Chip ID returned by the MESH cell inside the Heathrow ASIC
#define HeathrowMESHID 4
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namespace MeshScsi {
// MESH registers offsets
enum MeshReg : uint8_t {
XferCount0 = 0,
XferCount1 = 1,
FIFO = 2,
Sequence = 3,
BusStatus0 = 4,
BusStatus1 = 5,
FIFOCount = 6,
Exception = 7,
Error = 8,
IntMask = 9,
Interrupt = 0xA,
SourceID = 0xB,
DestID = 0xC,
SyncParms = 0xD,
MeshID = 0xE,
SelTimeOut = 0xF
};
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}; // namespace MeshScsi
class MESHController : public HWComponent {
public:
MESHController(uint8_t mesh_id) {
supports_types(HWCompType::SCSI_HOST | HWCompType::SCSI_DEV);
this->chip_id = mesh_id;
};
~MESHController() = default;
static std::unique_ptr<HWComponent> create() {
return std::unique_ptr<MESHController>(new MESHController(HeathrowMESHID));
}
// MESH registers access
uint8_t read(uint8_t reg_offset);
void write(uint8_t reg_offset, uint8_t value);
private:
uint8_t chip_id; // Chip ID for the MESH controller
};
#endif // MESH_H