mirror of
https://github.com/dingusdev/dingusppc.git
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244 lines
6.4 KiB
C++
244 lines
6.4 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 SCSI bus definitions. */
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#ifndef SCSI_H
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#define SCSI_H
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#include <devices/common/hwcomponent.h>
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#include <array>
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#include <cinttypes>
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#include <functional>
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#include <string>
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/** SCSI control signals.
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Bit positions follow the MESH controller convention for easier mapping.
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*/
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enum {
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SCSI_CTRL_IO = 1 << 0,
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SCSI_CTRL_CD = 1 << 1,
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SCSI_CTRL_MSG = 1 << 2,
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SCSI_CTRL_ATN = 1 << 3,
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SCSI_CTRL_ACK = 1 << 4,
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SCSI_CTRL_REQ = 1 << 5,
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SCSI_CTRL_SEL = 1 << 6,
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SCSI_CTRL_BSY = 1 << 7,
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SCSI_CTRL_RST = 1 << 8,
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};
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namespace ScsiPhase {
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enum : int {
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BUS_FREE = 0,
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ARBITRATION,
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SELECTION,
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RESELECTION,
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COMMAND,
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DATA_IN,
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DATA_OUT,
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STATUS,
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MESSAGE_IN,
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MESSAGE_OUT,
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RESET,
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};
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};
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namespace ScsiStatus {
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enum : uint8_t {
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GOOD = 0,
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CHECK_CONDITION = 2,
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};
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};
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namespace ScsiMessage {
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enum : uint8_t {
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COMMAND_COMPLETE = 0,
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};
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};
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enum ScsiMsg : int {
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CONFIRM_SEL = 1,
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BUS_PHASE_CHANGE,
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SEND_CMD_BEGIN,
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SEND_CMD_END,
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MESSAGE_BEGIN,
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MESSAGE_END,
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};
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enum ScsiCommand : int {
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TEST_UNIT_READY = 0x0,
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REWIND = 0x1,
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REQ_SENSE = 0x3,
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FORMAT = 0x4,
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READ_BLK_LIMITS = 0x5,
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READ_6 = 0x8,
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WRITE_6 = 0xA,
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SEEK_6 = 0xB,
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INQUIRY = 0x12,
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VERIFY_6 = 0x13,
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MODE_SELECT_6 = 0x15,
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RELEASE_UNIT = 0x17,
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ERASE_6 = 0x19,
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MODE_SENSE_6 = 0x1A,
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DIAG_RESULTS = 0x1C,
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SEND_DIAGS = 0x1D,
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READ_CAPAC_10 = 0x25,
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READ_10 = 0x28,
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WRITE_10 = 0x2A,
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VERIFY_10 = 0x2F,
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READ_LONG_10 = 0x35,
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};
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enum ScsiSense : int {
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NO_SENSE = 0x0,
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RECOVERED = 0x1,
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NOT_READY = 0x2,
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MEDIUM_ERR = 0x3,
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HW_ERROR = 0x4,
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ILLEGAL_REQ = 0x5,
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UNIT_ATTENTION = 0x6,
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DATA_PROTECT = 0x7,
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BLANK_CHECK = 0x8,
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VOL_OVERFLOW = 0xD,
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MISCOMPARE = 0xE,
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COMPLETED = 0xF
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};
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enum ScsiError : int {
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NO_ERROR = 0x0,
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NO_SECTOR = 0x1,
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WRITE_FAULT = 0x3,
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DEV_NOT_READY = 0x4,
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INVALID_CMD = 0x20,
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INVALID_LBA = 0x21,
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INVALID_CDB = 0x24,
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INVALID_LUN = 0x25,
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WRITE_PROTECT = 0x27
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};
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/** Standard SCSI bus timing values measured in ns. */
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#define BUS_SETTLE_DELAY 400
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#define BUS_FREE_DELAY 800
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#define BUS_CLEAR_DELAY 800
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#define ARB_DELAY 2400
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#define SEL_ABORT_TIME 200000
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#define SEL_TIME_OUT 250000000
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#define SCSI_MAX_DEVS 8
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class ScsiBus;
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typedef std::function<void()> action_callback;
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class ScsiDevice : public HWComponent {
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public:
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ScsiDevice(int my_id) {
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this->scsi_id = my_id;
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this->cur_phase = ScsiPhase::BUS_FREE;
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};
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~ScsiDevice() = default;
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virtual void notify(ScsiBus* bus_obj, ScsiMsg msg_type, int param);
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virtual void next_step(ScsiBus* bus_obj);
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virtual void prepare_xfer(ScsiBus* bus_obj, int& bytes_in, int& bytes_out);
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virtual void switch_phase(const int new_phase);
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virtual bool has_data() { return this->data_size != 0; };
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virtual int send_data(uint8_t* dst_ptr, int count);
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virtual int rcv_data(const uint8_t* src_ptr, const int count);
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virtual bool prepare_data() = 0;
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virtual void process_command() = 0;
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protected:
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uint8_t cmd_buf[16] = {};
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uint8_t msg_buf[16] = {}; // TODO: clarify how big this one should be
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int scsi_id;
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int initiator_id;
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int cur_phase;
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uint8_t* data_ptr = nullptr;
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int data_size;
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int incoming_size;
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uint8_t status;
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ScsiBus* bus_obj;
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action_callback pre_xfer_action = nullptr;
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action_callback post_xfer_action = nullptr;
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};
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/** This class provides a higher level abstraction for the SCSI bus. */
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class ScsiBus : public HWComponent {
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public:
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ScsiBus();
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~ScsiBus() = default;
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// low-level state management
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void register_device(int id, ScsiDevice* dev_obj);
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int current_phase() { return this->cur_phase; };
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int get_initiator_id() { return this->initiator_id; };
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int get_target_id() { return this->target_id; };
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// reading/writing control lines
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void assert_ctrl_line(int id, uint16_t mask);
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void release_ctrl_line(int id, uint16_t mask);
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void release_ctrl_lines(int id);
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uint16_t test_ctrl_lines(uint16_t mask);
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// reading/writing data lines
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uint8_t get_data_lines() { return this->data_lines; };
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// high-level control/status
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int switch_phase(int id, int new_phase);
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bool begin_arbitration(int id);
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bool end_arbitration(int id);
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bool begin_selection(int initiator_id, int target_id, bool atn);
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void confirm_selection(int target_id);
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bool end_selection(int initiator_id, int target_id);
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void disconnect(int dev_id);
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bool pull_data(const int id, uint8_t* dst_ptr, const int size);
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bool push_data(const int id, const uint8_t* src_ptr, const int size);
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void target_next_step();
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bool negotiate_xfer(int& bytes_in, int& bytes_out);
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protected:
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void change_bus_phase(int initiator_id);
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private:
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std::string name;
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// SCSI devices registered with this bus
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std::array<ScsiDevice*, SCSI_MAX_DEVS> devices;
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// per-device state of the control lines
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uint16_t dev_ctrl_lines[SCSI_MAX_DEVS] = {};
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uint16_t ctrl_lines;
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int cur_phase;
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int arb_winner_id;
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int initiator_id;
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int target_id;
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uint8_t data_lines;
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};
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#endif // SCSI_H
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