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https://github.com/fhgwright/SCSI2SD.git
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124 lines
2.9 KiB
C
Executable File
124 lines
2.9 KiB
C
Executable File
// Copyright (C) 2013 Michael McMaster <michael@codesrc.com>
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//
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// This file is part of SCSI2SD.
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//
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// SCSI2SD 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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//
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// SCSI2SD 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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//
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// You should have received a copy of the GNU General Public License
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// along with SCSI2SD. If not, see <http://www.gnu.org/licenses/>.
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#ifndef SCSI_H
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#define SCSI_H
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#include "geometry.h"
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#include "sense.h"
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typedef enum
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{
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// internal bits
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__scsiphase_msg = 1,
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__scsiphase_cd = 2,
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__scsiphase_io = 4,
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BUS_FREE = -1,
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BUS_BUSY = -2,
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ARBITRATION = -3,
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SELECTION = -4,
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RESELECTION = -5,
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STATUS = __scsiphase_cd | __scsiphase_io,
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COMMAND = __scsiphase_cd,
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DATA_IN = __scsiphase_io,
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DATA_OUT = 0,
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MESSAGE_IN = __scsiphase_msg | __scsiphase_cd | __scsiphase_io,
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MESSAGE_OUT = __scsiphase_msg | __scsiphase_cd
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} SCSI_PHASE;
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typedef enum
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{
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GOOD = 0,
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CHECK_CONDITION = 2,
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BUSY = 0x8,
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INTERMEDIATE = 0x10,
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CONFLICT = 0x18
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} SCSI_STATUS;
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typedef enum
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{
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MSG_COMMAND_COMPLETE = 0,
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MSG_REJECT = 0x7,
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MSG_LINKED_COMMAND_COMPLETE = 0x0A,
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MSG_LINKED_COMMAND_COMPLETE_WITH_FLAG = 0x0B
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} SCSI_MESSAGE;
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// Maximum value for bytes-per-sector.
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#define MAX_SECTOR_SIZE 8192
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#define MIN_SECTOR_SIZE 64
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typedef struct
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{
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uint8_t scsiIdMask;
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// Set to true (1) if the ATN flag was set, and we need to
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// enter the MESSAGE_OUT phase.
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volatile int atnFlag;
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// Set to true (1) if the RST flag was set.
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volatile int resetFlag;
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// Set to true (1) if a parity error was observed.
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int parityError;
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int phase;
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uint8 data[MAX_SECTOR_SIZE];
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int dataPtr; // Index into data, reset on [re]selection to savedDataPtr
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int savedDataPtr; // Index into data, initially 0.
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int dataLen;
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uint8 cdb[12]; // command descriptor block
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uint8 cdbLen; // 6, 10, or 12 byte message.
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int8 lun; // Target lun, set by IDENTIFY message.
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// Only let the reserved initiator talk to us.
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// A 3rd party may be sending the RESERVE/RELEASE commands
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int initiatorId; // 0 -> 7. Set during the selection phase.
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int reservedId; // 0 -> 7 if reserved. -1 if not reserved.
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int reserverId; // 0 -> 7 if reserved. -1 if not reserved.
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// SCSI_STATUS value.
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// Change to SCSI_STATUS_CHECK_CONDITION when setting a SENSE value
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uint8 status;
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ScsiSense sense;
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uint16 unitAttention; // Set to the sense qualifier key to be returned.
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uint8 msgIn;
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uint8 msgOut;
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void (*postDataOutHook)(void);
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uint8 cmdCount;
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uint8 selCount;
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uint8 rstCount;
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uint8 msgCount;
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uint8 watchdogTick;
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uint8 lastStatus;
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uint8 lastSense;
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} ScsiDevice;
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extern ScsiDevice scsiDev;
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void scsiInit(void);
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void scsiPoll(void);
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#endif
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