www.pudn.com > cdrecord.zip > scsi-linux-pg.c
/* @(#)scsi-linux-pg.c 1.6 98/10/07 Copyright 1997 J. Schilling */
#ifndef lint
static char ___sccsid[] =
"@(#)scsi-linux-pg.c 1.6 98/10/07 Copyright 1997 J. Schilling";
#endif
/*
* Interface for the Linux PARIDE implementation.
*
* We emulate the functionality of the scg driver, via the pg driver.
*
* Copyright (c) 1997 J. Schilling
* Copyright (c) 1998 Grant R. Guenther
* Under the terms of the GNU public license.
*/
/*
* 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 2, 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; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include
#ifdef USE_PG_ONLY
#define MAX_SCG 1 /* Max # of SCSI controllers */
#define MAX_TGT 8
#define MAX_LUN 8
LOCAL char *SCSIbuf = (char *)-1;
LOCAL short scgfiles[MAX_SCG][MAX_TGT][MAX_LUN];
#else
#define scsi_open pg_open
#define scsi_send pg_send
#define scsi_maxdma pg_maxdma
#define scsi_isatapi pg_isatapi
#define scsireset pg_reset
LOCAL int pg_open __PR((char *device, int busno, int tgt, int tlun));
LOCAL long pg_maxdma __PR((void));
LOCAL int pg_isatapi __PR((void));
LOCAL int pg_reset __PR((void));
#endif
LOCAL int pgbus = -2; /* Make it different from all */
LOCAL int do_scsi_cmd __PR((int f, struct scg_cmd *sp));
LOCAL int do_scsi_sense __PR((int f, struct scg_cmd *sp));
LOCAL int scsi_send __PR((int f, struct scg_cmd *sp));
EXPORT
int scsi_open(device, busno, tgt, tlun)
char *device;
int busno;
int tgt;
int tlun;
{
register int f;
register int b;
#ifdef USE_PG_ONLY
register int t;
register int l;
#endif
register int nopen = 0;
char devname[32];
#ifndef USE_PG_ONLY
for (b=0; b < MAX_SCG; b++) {
if (buscookies[b] == -1) {
pgbus = b;
break;
}
}
if (debug)
printf("PP Bus: %d\n", pgbus);
#else
for (b=0; b < MAX_SCG; b++) {
for (t=0; t < MAX_TGT; t++) {
for (l=0; l < MAX_LUN ; l++)
scgfiles[b][t][l] = (short)-1;
}
}
#endif
if (pgbus < 0)
pgbus = 0;
if (*device != '\0' || (busno == -2 && tgt == -2))
goto openbydev;
if (busno >= 0 && tgt >= 0 && tlun >= 0) {
if (busno >= MAX_SCG || tgt >= MAX_TGT || tlun >= MAX_LUN)
return (-1);
#ifndef USE_PG_ONLY
if (pgbus != busno)
return (0);
#endif
sprintf(devname, "/dev/pg%d", tgt);
f = open(devname, 2);
if (f < 0) {
comerr("Cannot open '%s'.\n", devname);
return (0);
}
scgfiles[busno][tgt][tlun] = f;
return 1;
} else {
/* scsibus = 0; lun = 0;*/
tlun = 0;
for(tgt=0;tgt= 0) {
scgfiles[pgbus][tgt][tlun] = f;
nopen++;
}
}
}
openbydev:
if (*device != '\0') {
char *p;
if (tlun < 0)
return (0);
f = open(device, 2);
if (f < 0 && errno == ENOENT)
return (0);
p = device + strlen(device) -1;
tgt = *p - '0';
if (tgt < 0 || tgt > 9)
return (0);
scsibus = pgbus;
target = tgt;
lun = tlun;
scgfiles[pgbus][tgt][tlun] = f;
return (++nopen);
}
return (nopen);
}
LOCAL long
scsi_maxdma()
{
return (PG_MAX_DATA);
}
#ifdef USE_PG_ONLY
EXPORT void *
scsi_getbuf(amt)
long amt;
{
char *ret;
if (scg_maxdma == 0)
scg_maxdma = scsi_maxdma();
if (amt <= 0 || amt > scg_maxdma)
return ((void *)0);
if (debug)
printf("scsi_getbuf: %ld bytes\n", amt);
ret = valloc((size_t)(amt+getpagesize()));
if (ret == NULL)
return (ret);
ret += getpagesize();
SCSIbuf = ret;
return ((void *)ret);
}
EXPORT
BOOL scsi_havebus(busno)
int busno;
{
register int t;
register int l;
if (busno < 0 || busno >= MAX_SCG)
return (FALSE);
for (t=0; t < MAX_TGT; t++) {
for (l=0; l < MAX_LUN ; l++)
if (scgfiles[busno][t][l] >= 0)
return (TRUE);
}
return (FALSE);
}
EXPORT
int scsi_fileno(busno, tgt, tlun)
int busno;
int tgt;
int tlun;
{
if (busno < 0 || busno >= MAX_SCG ||
tgt < 0 || tgt >= MAX_TGT ||
tlun < 0 || tlun >= MAX_LUN)
return (-1);
return ((int)scgfiles[busno][tgt][tlun]);
}
#endif /* USE_PG_ONLY */
EXPORT
int scsi_isatapi()
{
return (TRUE);
}
EXPORT
int scsireset()
{
int f = scsi_fileno(scsibus, target, lun);
struct pg_write_hdr hdr = {PG_MAGIC, PG_RESET, 0};
return (write(f, (char *)&hdr, sizeof(hdr)));
}
#ifndef MAX
#define MAX(a,b) ((a)>(b)?(a):(b))
#endif
#define RHSIZE sizeof(struct pg_read_hdr)
#define WHSIZE sizeof(struct pg_write_hdr)
#define LEAD MAX(RHSIZE,WHSIZE)
LOCAL int
do_scsi_cmd(f, sp)
int f;
struct scg_cmd *sp;
{
char local[LEAD+PG_MAX_DATA];
int use_local, i, r;
int inward = (sp->flags & SCG_RECV_DATA);
struct pg_write_hdr *whp;
struct pg_read_hdr *rhp;
char *dbp;
if (sp->cdb_len > 12)
comerrno(EX_BAD, "Can't do %d byte command.\n", sp->cdb_len);
if (sp->addr == SCSIbuf) {
use_local = 0;
dbp = sp->addr;
} else {
use_local = 1;
dbp = &local[LEAD];
if (!inward)
movebytes(sp->addr, dbp, sp->size);
}
whp = (struct pg_write_hdr *)(dbp - WHSIZE);
rhp = (struct pg_read_hdr *)(dbp - RHSIZE);
whp->magic = PG_MAGIC;
whp->func = PG_COMMAND;
whp->dlen = sp->size;
whp->timeout = sp->timeout;
for(i=0;icdb_len;i++)
whp->packet[i] = sp->cdb.cmd_cdb[i];
i = WHSIZE;
if (!inward)
i += sp->size;
r = write(f, (char *)whp, i);
if (r < 0) { /* command was not sent */
sp->ux_errno = geterrno();
if (sp->ux_errno == ETIME) {
/*
* If the previous command timed out, we cannot send
* any further command until the command in the drive
* is ready. So we behave as if the drive did not
* respond to the command.
*/
sp->error = SCG_FATAL;
return 0;
}
return -1;
}
if (r != i)
errmsg("scsi_send(%s) wrote %d bytes (expected %d).\n",
scsi_command, r, i);
sp->ux_errno = 0;
sp->sense_count = 0;
r = read(f, (char *)rhp, RHSIZE+sp->size);
if (r < 0) {
sp->ux_errno = geterrno();
if (sp->ux_errno == ETIME) {
sp->error = SCG_TIMEOUT;
return 0;
}
sp->error = SCG_FATAL;
return -1;
}
i = rhp->dlen;
if (i > sp->size) {
/*
* "DMA overrun" should be handled in the kernel.
* However this may happen with flaky PP adapters.
*/
errmsgno(EX_BAD,
"DMA (read) overrun by %d bytes (requested %d bytes).\n",
i - sp->size, sp->size);
i = sp->size;
}
if (use_local && inward)
movebytes(dbp, sp->addr, i);
sp->resid = sp->size - i;
fillbytes(&sp->scb, sizeof(sp->scb), '\0');
fillbytes(&sp->u_sense.cmd_sense, sizeof(sp->u_sense.cmd_sense), '\0');
sp->error = SCG_NO_ERROR;
i = rhp->scsi?2:0;
sp->u_scb.cmd_scb[0] = i;
if (i) {
if (sp->ux_errno == 0)
sp->ux_errno = EIO;
sp->error = SCG_RETRYABLE;
}
return 0;
}
LOCAL int
do_scsi_sense(f, sp)
int f;
struct scg_cmd *sp;
{
int ret;
struct scg_cmd s_cmd;
if (sp->sense_len > SCG_MAX_SENSE)
sp->sense_len = SCG_MAX_SENSE;
fillbytes((caddr_t)&s_cmd, sizeof(s_cmd), '\0');
s_cmd.addr = sp->u_sense.cmd_sense;
s_cmd.size = sp->sense_len;
s_cmd.flags = SCG_RECV_DATA|SCG_DISRE_ENA;
s_cmd.cdb_len = SC_G0_CDBLEN;
s_cmd.sense_len = CCS_SENSE_LEN;
s_cmd.target = target;
s_cmd.cdb.g0_cdb.cmd = SC_REQUEST_SENSE;
s_cmd.cdb.g0_cdb.lun = sp->cdb.g0_cdb.lun;
s_cmd.cdb.g0_cdb.count = sp->sense_len;
ret = do_scsi_cmd(f, &s_cmd);
if (ret < 0)
return (ret);
sp->sense_count = sp->sense_len - s_cmd.resid;
return (ret);
}
LOCAL int
scsi_send(f, sp)
int f;
struct scg_cmd *sp;
{
int ret;
if (f < 0) {
sp->error = SCG_FATAL;
return (0);
}
ret = do_scsi_cmd(f, sp);
if (ret < 0)
return (ret);
if (sp->u_scb.cmd_scb[0])
ret = do_scsi_sense(f, sp);
return (ret);
}
/* end of scsi-linux-pg.c */
#ifndef USE_PG_ONLY
#undef scsi_open
#undef scsi_send
#undef scsi_maxdma
#undef scsi_isatapi
#undef scsireset
#endif