scsi-linux-pg.c
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上传日期:2007-01-06
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- /* @(#)scsi-linux-pg.c 1.21 99/11/30 Copyright 1997 J. Schilling */
- #ifndef lint
- static char ___sccsid[] =
- "@(#)scsi-linux-pg.c 1.21 99/11/30 Copyright 1997 J. Schilling";
- #endif
- /*
- * Interface for the Linux PARIDE implementation.
- *
- * We emulate the functionality of the scg driver, via the pg driver.
- *
- * Warning: you may change this source, but if you do that
- * you need to change the _scg_version and _scg_auth* string below.
- * You may not return "schily" for an SCG_AUTHOR request anymore.
- * Choose your name instead of "schily" and make clear that the version
- * string is related to a modified source.
- *
- * Copyright (c) 1997 J. Schilling
- * Copyright (c) 1998 Grant R. Guenther <grant@torque.net>
- * 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.
- */
- #ifdef HAVE_LINUX_PG_H
- #include <linux/pg.h>
- #else
- #include "pg.h" /* Use local version as Linux sometimes doesn't have */
- #endif /* installed. Now libscg always supports PP SCSI */
- /*
- * Warning: you may change this source, but if you do that
- * you need to change the _scg_version and _scg_auth* string below.
- * You may not return "schily" for an SCG_AUTHOR request anymore.
- * Choose your name instead of "schily" and make clear that the version
- * string is related to a modified source.
- */
- LOCAL char _scg_trans_version_pg[] = "scsi-linux-pg.c-1.21"; /* The version for this transport*/
- #ifdef USE_PG_ONLY
- #define MAX_SCG 1 /* Max # of SCSI controllers */
- #define MAX_TGT 8
- #define MAX_LUN 8
- struct scg_local {
- short scgfiles[MAX_SCG][MAX_TGT][MAX_LUN];
- short buscookies[MAX_SCG];
- int pgbus;
- char *SCSIbuf;
- };
- #define scglocal(p) ((struct scg_local *)((p)->local))
- #else
- #define scg__version pg_version
- #define scsi_open pg_open
- #define scsi_close pg_close
- #define scsi_send pg_send
- #define scsi_maxdma pg_maxdma
- #define scsi_initiator_id pg_initiator_id
- #define scsi_isatapi pg_isatapi
- #define scsireset pg_reset
- EXPORT char *pg_version __PR((SCSI *scgp, int what));
- LOCAL int pg_open __PR((SCSI *scgp, char *device, int busno, int tgt, int tlun));
- LOCAL int pg_close __PR((SCSI *scgp));
- LOCAL long pg_maxdma __PR((SCSI *scgp));
- LOCAL int pg_initiator_id __PR((SCSI *scgp));
- LOCAL int pg_isatapi __PR((SCSI *scgp));
- LOCAL int pg_reset __PR((SCSI *scgp));
- LOCAL int pg_send __PR((SCSI *scgp, int f, struct scg_cmd *sp));
- #endif
- LOCAL int do_scsi_cmd __PR((SCSI *scgp, int f, struct scg_cmd *sp));
- LOCAL int do_scsi_sense __PR((SCSI *scgp, int f, struct scg_cmd *sp));
- /*
- * Return version information for the low level SCSI transport code.
- * This has been introduced to make it easier to trace down problems
- * in applications.
- */
- EXPORT char *
- scg__version(scgp, what)
- SCSI *scgp;
- int what;
- {
- if (scgp != (SCSI *)0) {
- switch (what) {
- case SCG_VERSION:
- return (_scg_trans_version_pg);
- /*
- * If you changed this source, you are not allowed to
- * return "schily" for the SCG_AUTHOR request.
- */
- case SCG_AUTHOR:
- return (_scg_auth_schily);
- case SCG_SCCS_ID:
- return (___sccsid);
- }
- }
- return ((char *)0);
- }
- EXPORT int
- scsi_open(scgp, device, busno, tgt, tlun)
- SCSI *scgp;
- 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];
- if (busno >= MAX_SCG || tgt >= MAX_TGT || tlun >= MAX_LUN) {
- errno = EINVAL;
- if (scgp->errstr)
- js_snprintf(scgp->errstr, SCSI_ERRSTR_SIZE,
- "Illegal value for busno, target or lun '%d,%d,%d'",
- busno, tgt, tlun);
- return (-1);
- }
- #ifndef USE_PG_ONLY
- /*
- * We need to find a fake bus number for the parallel port interface.
- * Unfortunatly, the buscookie array may contain holes if
- * SCSI_IOCTL_GET_BUS_NUMBER works, so we are searching backwards
- * for some place for us.
- * XXX Should add extra space in buscookies for a "PP bus".
- */
- if (scglocal(scgp)->buscookies[MAX_SCG-1] != (short)-1)
- return (0); /* No space for pgbus */
- for (b=MAX_SCG-1; b >= 0; b--) {
- if (scglocal(scgp)->buscookies[b] != (short)-1) {
- scglocal(scgp)->pgbus = ++b;
- break;
- }
- }
- if (scgp->debug)
- printf("PP Bus: %dn", scglocal(scgp)->pgbus);
- #else
- if (scgp->local == NULL) {
- scgp->local = malloc(sizeof(struct scg_local));
- if (scgp->local == NULL)
- return (0);
- scglocal(scgp)->pgbus = -2;
- scglocal(scgp)->SCSIbuf = (char *)-1;
- for (b=0; b < MAX_SCG; b++) {
- for (t=0; t < MAX_TGT; t++) {
- for (l=0; l < MAX_LUN ; l++)
- scglocal(scgp)->scgfiles[b][t][l] = (short)-1;
- }
- }
- }
- #endif
- if (scglocal(scgp)->pgbus < 0)
- scglocal(scgp)->pgbus = 0;
- if ((device != NULL && *device != ' ') || (busno == -2 && tgt == -2))
- goto openbydev;
- if (busno >= 0 && tgt >= 0 && tlun >= 0) {
- #ifndef USE_PG_ONLY
- if (scglocal(scgp)->pgbus != busno)
- return (0);
- #endif
- sprintf(devname, "/dev/pg%d", tgt);
- f = open(devname, 2);
- if (f < 0) {
- if (scgp->errstr)
- js_snprintf(scgp->errstr, SCSI_ERRSTR_SIZE,
- "Cannot open '%s'", devname);
- return (0);
- }
- scglocal(scgp)->scgfiles[busno][tgt][tlun] = f;
- return 1;
- } else {
- /* scgp->scsibus = 0; scgp->lun = 0;*/
- tlun = 0;
- for(tgt=0;tgt<MAX_TGT;tgt++) {
- sprintf(devname, "/dev/pg%d", tgt);
- f = open(devname, 2);
- if (f >= 0) {
- scglocal(scgp)->scgfiles[scglocal(scgp)->pgbus][tgt][tlun] = f;
- nopen++;
- }
- }
- }
- openbydev:
- if (device != NULL && *device != ' ') {
- 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);
- scgp->scsibus = scglocal(scgp)->pgbus;
- scgp->target = tgt;
- scgp->lun = tlun;
- scglocal(scgp)->scgfiles[scglocal(scgp)->pgbus][tgt][tlun] = f;
- return (++nopen);
- }
- return (nopen);
- }
- EXPORT int
- scsi_close(scgp)
- SCSI *scgp;
- {
- register int f;
- register int b;
- register int t;
- register int l;
- if (scgp->local == NULL)
- return (-1);
- if (scglocal(scgp)->pgbus < 0)
- return (0);
- b = scglocal(scgp)->pgbus;
- scglocal(scgp)->buscookies[b] = (short)-1;
- for (t=0; t < MAX_TGT; t++) {
- for (l=0; l < MAX_LUN ; l++)
- f = scglocal(scgp)->scgfiles[b][t][l];
- if (f >= 0)
- close(f);
- scglocal(scgp)->scgfiles[b][t][l] = (short)-1;
- }
- return (0);
- }
- LOCAL long
- scsi_maxdma(scgp)
- SCSI *scgp;
- {
- return (PG_MAX_DATA);
- }
- #ifdef USE_PG_ONLY
- EXPORT void *
- scsi_getbuf(scgp, amt)
- SCSI *scgp;
- long amt;
- {
- char *ret;
- if (amt <= 0 || amt > scsi_maxdma(scgp))
- return ((void *)0);
- if (scgp->debug)
- printf("scsi_getbuf: %ld bytesn", amt);
- ret = valloc((size_t)(amt+getpagesize()));
- if (ret == NULL)
- return (ret);
- scgp->bufbase = ret;
- ret += getpagesize();
- scglocal(scgp)->SCSIbuf = ret;
- return ((void *)ret);
- }
- EXPORT void
- scsi_freebuf(scgp)
- SCSI *scgp;
- {
- if (scgp->bufbase)
- free(scgp->bufbase);
- scgp->bufbase = NULL;
- }
- EXPORT
- BOOL scsi_havebus(scgp, busno)
- SCSI *scgp;
- int busno;
- {
- register int t;
- register int l;
- if (busno < 0 || busno >= MAX_SCG)
- return (FALSE);
- if (scgp->local == NULL)
- return (FALSE);
- for (t=0; t < MAX_TGT; t++) {
- for (l=0; l < MAX_LUN ; l++)
- if (scglocal(scgp)->scgfiles[busno][t][l] >= 0)
- return (TRUE);
- }
- return (FALSE);
- }
- EXPORT
- int scsi_fileno(scgp, busno, tgt, tlun)
- SCSI *scgp;
- int busno;
- int tgt;
- int tlun;
- {
- if (busno < 0 || busno >= MAX_SCG ||
- tgt < 0 || tgt >= MAX_TGT ||
- tlun < 0 || tlun >= MAX_LUN)
- return (-1);
- if (scgp->local == NULL)
- return (-1);
- return ((int)scglocal(scgp)->scgfiles[busno][tgt][tlun]);
- }
- #endif /* USE_PG_ONLY */
- EXPORT int
- scsi_initiator_id(scgp)
- SCSI *scgp;
- {
- return (-1);
- }
- EXPORT
- int scsi_isatapi(scgp)
- SCSI *scgp;
- {
- return (TRUE);
- }
- EXPORT
- int scsireset(scgp)
- SCSI *scgp;
- {
- int f = scsi_fileno(scgp, scgp->scsibus, scgp->target, scgp->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(scgp, f, sp)
- SCSI *scgp;
- 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 == scglocal(scgp)->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; i<12; i++) {
- if (i < sp->cdb_len)
- whp->packet[i] = sp->cdb.cmd_cdb[i];
- else
- whp->packet[i] = 0;
- }
- 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",
- scgp->cmdname, 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), ' ');
- fillbytes(&sp->u_sense.cmd_sense, sizeof(sp->u_sense.cmd_sense), ' ');
- 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(scgp, f, sp)
- SCSI *scgp;
- 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), ' ');
- 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 = scgp->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(scgp, f, &s_cmd);
- if (ret < 0)
- return (ret);
- sp->sense_count = sp->sense_len - s_cmd.resid;
- return (ret);
- }
- LOCAL int
- scsi_send(scgp, f, sp)
- SCSI *scgp;
- int f;
- struct scg_cmd *sp;
- {
- int ret;
- if (f < 0) {
- sp->error = SCG_FATAL;
- return (0);
- }
- ret = do_scsi_cmd(scgp, f, sp);
- if (ret < 0)
- return (ret);
- if (sp->u_scb.cmd_scb[0])
- ret = do_scsi_sense(scgp, f, sp);
- return (ret);
- }
- /* end of scsi-linux-pg.c */
- #ifndef USE_PG_ONLY
- #undef scg__version
- #undef scsi_open
- #undef scsi_close
- #undef scsi_send
- #undef scsi_maxdma
- #undef scsi_initiator_id
- #undef scsi_isatapi
- #undef scsireset
- #endif