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gems-kernel/source/THIRDPARTY/linux-old/drivers/scsi/scsi.h
Sam Sneed 58217f5900 GEMS Kernel is going to be better than ever... 
WOO HOO!
2024-06-03 11:16:15 -05:00

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/*
* scsi.h Copyright (C) 1992 Drew Eckhardt
* generic SCSI package header file by
* Drew Eckhardt
*
* <drew@colorado.edu>
*
* Modified by Eric Youngdale eric@tantalus.nrl.navy.mil to
* add scatter-gather, multiple outstanding request, and other
* enhancements.
*/
#ifndef _SCSI_H
#define _SCSI_H
/*
$Header: /usr/src/linux/kernel/blk_drv/scsi/RCS/scsi.h,v 1.3 1993/09/24 12:20:33 drew Exp $
For documentation on the OPCODES, MESSAGES, and SENSE values,
please consult the SCSI standard.
*/
/*
SCSI opcodes
*/
#define TEST_UNIT_READY 0x00
#define REZERO_UNIT 0x01
#define REQUEST_SENSE 0x03
#define FORMAT_UNIT 0x04
#define READ_BLOCK_LIMITS 0x05
#define REASSIGN_BLOCKS 0x07
#define READ_6 0x08
#define WRITE_6 0x0a
#define SEEK_6 0x0b
#define READ_REVERSE 0x0f
#define WRITE_FILEMARKS 0x10
#define SPACE 0x11
#define INQUIRY 0x12
#define RECOVER_BUFFERED_DATA 0x14
#define MODE_SELECT 0x15
#define RESERVE 0x16
#define RELEASE 0x17
#define COPY 0x18
#define ERASE 0x19
#define MODE_SENSE 0x1a
#define START_STOP 0x1b
#define RECEIVE_DIAGNOSTIC 0x1c
#define SEND_DIAGNOSTIC 0x1d
#define ALLOW_MEDIUM_REMOVAL 0x1e
#define READ_CAPACITY 0x25
#define READ_10 0x28
#define WRITE_10 0x2a
#define SEEK_10 0x2b
#define WRITE_VERIFY 0x2e
#define VERIFY 0x2f
#define SEARCH_HIGH 0x30
#define SEARCH_EQUAL 0x31
#define SEARCH_LOW 0x32
#define SET_LIMITS 0x33
#define PRE_FETCH 0x34
#define READ_POSITION 0x34
#define SYNCRONIZE_CACHE 0x35
#define LOCK_UNLOCK_CACHE 0x36
#define READ_DEFECT_DATA 0x37
#define COMPARE 0x39
#define COPY_VERIFY 0x3a
#define WRITE_BUFFER 0x3b
#define READ_BUFFER 0x3c
#define READ_LONG 0x3e
#define CHANGE_DEFINITION 0x40
#define LOG_SELECT 0x4c
#define LOG_SENSE 0x4d
#define MODE_SELECT_10 0x55
#define MODE_SENSE_10 0x5a
extern const unsigned char scsi_command_size[8];
#define COMMAND_SIZE(opcode) scsi_command_size[((opcode) >> 5) & 7]
/*
MESSAGE CODES
*/
#define COMMAND_COMPLETE 0x00
#define EXTENDED_MESSAGE 0x01
#define SAVE_POINTERS 0x02
#define RESTORE_POINTERS 0x03
#define DISCONNECT 0x04
#define INITIATOR_ERROR 0x05
#define ABORT 0x06
#define MESSAGE_REJECT 0x07
#define NOP 0x08
#define MSG_PARITY_ERROR 0x09
#define LINKED_CMD_COMPLETE 0x0a
#define LINKED_FLG_CMD_COMPLETE 0x0b
#define BUS_DEVICE_RESET 0x0c
#define SIMPLE_QUEUE_TAG 0x20
#define HEAD_OF_QUEUE_TAG 0x21
#define ORDERED_QUEUE_TAG 0x22
#define IDENTIFY_BASE 0x80
#define IDENTIFY(can_disconnect, lun) (IDENTIFY_BASE |\
((can_disconnect) ? 0x40 : 0) |\
((lun) & 0x07))
/*
Status codes
*/
#define GOOD 0x00
#define CHECK_CONDITION 0x01
#define CONDITION_GOOD 0x02
#define BUSY 0x04
#define INTERMEDIATE_GOOD 0x08
#define INTERMEDIATE_C_GOOD 0x0a
#define RESERVATION_CONFLICT 0x0c
#define STATUS_MASK 0x1e
/*
the return of the status word will be in the following format :
The low byte is the status returned by the SCSI command,
with vendor specific bits masked.
The next byte is the message which followed the SCSI status.
This allows a stos to be used, since the Intel is a little
endian machine.
The final byte is a host return code, which is one of the following.
IE
lsb msb
status msg host code
Our errors returned by OUR driver, NOT SCSI message. Orr'd with
SCSI message passed back to driver <IF any>.
*/
/* NO error */
#define DID_OK 0x00
/* Couldn't connect before timeout period */
#define DID_NO_CONNECT 0x01
/* BUS stayed busy through time out period */
#define DID_BUS_BUSY 0x02
/* TIMED OUT for other reason */
#define DID_TIME_OUT 0x03
/* BAD target. */
#define DID_BAD_TARGET 0x04
/* Told to abort for some other reason */
#define DID_ABORT 0x05
/*
Parity error
*/
#define DID_PARITY 0x06
/*
Internal error
*/
#define DID_ERROR 0x07
/*
Reset by somebody.
*/
#define DID_RESET 0x08
/*
Got an interrupt we weren't expecting.
*/
#define DID_BAD_INTR 0x09
/*
Driver status
*/
#define DRIVER_OK 0x00
/*
These indicate the error that occured, and what is available.
*/
#define DRIVER_BUSY 0x01
#define DRIVER_SOFT 0x02
#define DRIVER_MEDIA 0x03
#define DRIVER_ERROR 0x04
#define DRIVER_INVALID 0x05
#define DRIVER_TIMEOUT 0x06
#define DRIVER_HARD 0x07
#define SUGGEST_RETRY 0x10
#define SUGGEST_ABORT 0x20
#define SUGGEST_REMAP 0x30
#define SUGGEST_DIE 0x40
#define SUGGEST_SENSE 0x80
#define SUGGEST_IS_OK 0xff
#define DRIVER_SENSE 0x08
#define DRIVER_MASK 0x0f
#define SUGGEST_MASK 0xf0
/*
SENSE KEYS
*/
#define NO_SENSE 0x00
#define RECOVERED_ERROR 0x01
#define NOT_READY 0x02
#define MEDIUM_ERROR 0x03
#define HARDWARE_ERROR 0x04
#define ILLEGAL_REQUEST 0x05
#define UNIT_ATTENTION 0x06
#define DATA_PROTECT 0x07
#define BLANK_CHECK 0x08
#define COPY_ABORTED 0x0a
#define ABORTED_COMMAND 0x0b
#define VOLUME_OVERFLOW 0x0d
#define MISCOMPARE 0x0e
/*
DEVICE TYPES
*/
#define TYPE_DISK 0x00
#define TYPE_TAPE 0x01
#define TYPE_WORM 0x04 /* Treated as ROM by our system */
#define TYPE_ROM 0x05
#define TYPE_MOD 0x07 /* Magneto-optical disk - treated as TYPE_DISK */
#define TYPE_NO_LUN 0x7f
#define MAX_COMMAND_SIZE 12
/*
SCSI command sets
*/
#define SCSI_UNKNOWN 0
#define SCSI_1 1
#define SCSI_1_CCS 2
#define SCSI_2 3
/*
Every SCSI command starts with a one byte OP-code.
The next byte's high three bits are the LUN of the
device. Any multi-byte quantities are stored high byte
first, and may have a 5 bit MSB in the same byte
as the LUN.
*/
/*
The scsi_device struct contains what we know about each given scsi
device.
*/
typedef struct scsi_device {
unsigned char id, lun, index;
int access_count; /* Count of open channels/mounts */
struct wait_queue * device_wait; /* Used to wait if device is busy */
struct Scsi_Host * host;
char type;
char scsi_level;
unsigned writeable:1;
unsigned removable:1;
unsigned random:1;
unsigned changed:1; /* Data invalid due to media change */
unsigned busy:1; /* Used to prevent races */
unsigned lockable:1; /* Able to prevent media removal */
unsigned borken:1; /* Tell the Seagate driver to be
painfully slow on this device */
unsigned tagged_supported:1; /* Supports SCSI-II tagged queing */
unsigned tagged_queue:1; /*SCSI-II tagged queing enabled */
unsigned disconnect:1; /* can disconnect */
unsigned char current_tag; /* current tag */
} Scsi_Device;
/*
Use these to separate status msg and our bytes
*/
#define status_byte(result) (((result) >> 1) & 0xf)
#define msg_byte(result) (((result) >> 8) & 0xff)
#define host_byte(result) (((result) >> 16) & 0xff)
#define driver_byte(result) (((result) >> 24) & 0xff)
#define sugestion(result) (driver_byte(result) & SUGGEST_MASK)
#define sense_class(sense) (((sense) >> 4) & 0x7)
#define sense_error(sense) ((sense) & 0xf)
#define sense_valid(sense) ((sense) & 0x80);
/*
These are the SCSI devices available on the system.
*/
extern int NR_SCSI_DEVICES;
extern Scsi_Device * scsi_devices;
/*
Initializes all SCSI devices. This scans all scsi busses.
*/
extern unsigned long scsi_dev_init (unsigned long, unsigned long);
struct scatterlist {
char * address; /* Location data is to be transferred to */
char * alt_address; /* Location of actual if address is a
dma indirect buffer. NULL otherwise */
unsigned short length;
};
#define ISA_DMA_THRESHOLD (0x00ffffff)
void * scsi_malloc(unsigned int);
int scsi_free(void *, unsigned int);
extern unsigned int dma_free_sectors; /* How much room do we have left */
extern unsigned int need_isa_buffer; /* True if some devices need indirection
buffers */
/*
The Scsi_Cmnd structure is used by scsi.c internally, and for communication with
low level drivers that support multiple outstanding commands.
*/
typedef struct scsi_pointer {
char * ptr; /* data pointer */
int this_residual; /* left in this buffer */
struct scatterlist *buffer; /* which buffer */
int buffers_residual; /* how many buffers left */
volatile int Status;
volatile int Message;
volatile int have_data_in;
volatile int sent_command;
volatile int phase;
} Scsi_Pointer;
typedef struct scsi_cmnd {
struct Scsi_Host * host;
unsigned char target, lun, index;
struct scsi_cmnd *next, *prev;
/* These elements define the operation we are about to perform */
unsigned char cmnd[12];
unsigned request_bufflen; /* Actual request size */
void * request_buffer; /* Actual requested buffer */
/* These elements define the operation we ultimately want to perform */
unsigned char data_cmnd[12];
unsigned short old_use_sg; /* We save use_sg here when requesting
sense info */
unsigned short use_sg; /* Number of pieces of scatter-gather */
unsigned short sglist_len; /* size of malloc'd scatter-gather list */
unsigned bufflen; /* Size of data buffer */
void *buffer; /* Data buffer */
unsigned underflow; /* Return error if less than this amount is
transfered */
unsigned transfersize; /* How much we are guranteed to transfer with
each SCSI transfer (ie, between disconnect /
reconnects. Probably == sector size */
struct request request; /* A copy of the command we are working on*/
unsigned char sense_buffer[16]; /* Sense for this command, if needed*/
int retries;
int allowed;
int timeout_per_command, timeout_total, timeout;
/*
* We handle the timeout differently if it happens when a reset,
* abort, etc are in process.
*/
unsigned volatile char internal_timeout;
unsigned flags;
/* These variables are for the cdrom only. Once we have variable size buffers
in the buffer cache, they will go away. */
int this_count;
/* End of special cdrom variables */
/* Low-level done function - can be used by low-level driver to point
to completion function. Not used by mid/upper level code. */
void (*scsi_done)(struct scsi_cmnd *);
void (*done)(struct scsi_cmnd *); /* Mid-level done function */
/* The following fields can be written to by the host specific code.
Everything else should be left alone. */
Scsi_Pointer SCp; /* Scratchpad used by some host adapters */
unsigned char * host_scribble; /* The host adapter is allowed to
call scsi_malloc and get some memory
and hang it here. The host adapter
is also expected to call scsi_free
to release this memory. (The memory
obtained by scsi_malloc is guaranteed
to be at an address < 16Mb). */
int result; /* Status code from lower level driver */
unsigned char tag; /* SCSI-II queued command tag */
} Scsi_Cmnd;
/*
scsi_abort aborts the current command that is executing on host host.
The error code, if non zero is returned in the host byte, otherwise
DID_ABORT is returned in the hostbyte.
*/
extern int scsi_abort (Scsi_Cmnd *, int code);
extern void scsi_do_cmd (Scsi_Cmnd *, const void *cmnd ,
void *buffer, unsigned bufflen, void (*done)(struct scsi_cmnd *),
int timeout, int retries);
extern Scsi_Cmnd * allocate_device(struct request **, int, int);
extern Scsi_Cmnd * request_queueable(struct request *, int);
extern int scsi_reset (Scsi_Cmnd *);
extern int max_scsi_hosts;
extern int MAX_SD, NR_SD, MAX_ST, NR_ST, MAX_SR, NR_SR, NR_SG, MAX_SG;
extern unsigned long sd_init(unsigned long, unsigned long);
extern unsigned long sd_init1(unsigned long, unsigned long);
extern void sd_attach(Scsi_Device *);
extern unsigned long sr_init(unsigned long, unsigned long);
extern unsigned long sr_init1(unsigned long, unsigned long);
extern void sr_attach(Scsi_Device *);
extern unsigned long st_init(unsigned long, unsigned long);
extern unsigned long st_init1(unsigned long, unsigned long);
extern void st_attach(Scsi_Device *);
extern unsigned long sg_init(unsigned long, unsigned long);
extern unsigned long sg_init1(unsigned long, unsigned long);
extern void sg_attach(Scsi_Device *);
#if defined(MAJOR_NR) && (MAJOR_NR != SCSI_TAPE_MAJOR)
static void end_scsi_request(Scsi_Cmnd * SCpnt, int uptodate, int sectors)
{
struct request * req;
struct buffer_head * bh;
struct task_struct * p;
req = &SCpnt->request;
req->errors = 0;
if (!uptodate) {
printk(DEVICE_NAME " I/O error: dev %04x, sector %lu\n",
req->dev,req->sector);
}
do {
if ((bh = req->bh) != NULL) {
req->bh = bh->b_reqnext;
req->nr_sectors -= bh->b_size >> 9;
req->sector += bh->b_size >> 9;
bh->b_reqnext = NULL;
bh->b_uptodate = uptodate;
unlock_buffer(bh);
sectors -= bh->b_size >> 9;
if ((bh = req->bh) != NULL) {
req->current_nr_sectors = bh->b_size >> 9;
if (req->nr_sectors < req->current_nr_sectors) {
req->nr_sectors = req->current_nr_sectors;
printk("end_scsi_request: buffer-list destroyed\n");
}
}
}
} while(sectors && bh);
if (req->bh){
req->buffer = bh->b_data;
return;
};
DEVICE_OFF(req->dev);
if ((p = req->waiting) != NULL) {
req->waiting = NULL;
p->state = TASK_RUNNING;
if (p->counter > current->counter)
need_resched = 1;
}
req->dev = -1;
wake_up(&scsi_devices[SCpnt->index].device_wait);
return;
}
/* This is just like INIT_REQUEST, but we need to be aware of the fact
that an interrupt may start another request, so we run this with interrupts
turned off */
#define INIT_SCSI_REQUEST \
if (!CURRENT) {\
CLEAR_INTR; \
sti(); \
return; \
} \
if (MAJOR(CURRENT->dev) != MAJOR_NR) \
panic(DEVICE_NAME ": request list destroyed"); \
if (CURRENT->bh) { \
if (!CURRENT->bh->b_lock) \
panic(DEVICE_NAME ": block not locked"); \
}
#endif
#define SCSI_SLEEP(QUEUE, CONDITION) { \
if (CONDITION) { \
struct wait_queue wait = { current, NULL}; \
add_wait_queue(QUEUE, &wait); \
sleep_repeat: \
current->state = TASK_UNINTERRUPTIBLE; \
if (CONDITION) { \
schedule(); \
goto sleep_repeat; \
} \
remove_wait_queue(QUEUE, &wait); \
current->state = TASK_RUNNING; \
}; }
#endif
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