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/*
* pt: Processor Type driver.
*
* Copyright (C) 1995, HD Associates, Inc.
* PO Box 276
* Pepperell, MA 01463
* 508 433 5266
* dufault@hda.com
*
* This code is contributed to the University of California at Berkeley:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: pt.c,v 1.4 1995/05/03 18:09:09 dufault Exp $
*/
/*
* XXX dufault@hda.com: We need the "kern devconf" stuff, but I'm not
* going to add it until it is done in a simple way that provides
* base behavior in scsi_driver.c
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <scsi/scsi_all.h>
#include <scsi/scsiconf.h>
struct scsi_data {
struct buf *buf_queue; /* the queue of pending IO operations */
};
void ptstart(u_int32 unit, u_int32 flags);
void pt_strategy(struct buf *bp, struct scsi_link *sc_link);
int pt_sense(struct scsi_xfer *scsi_xfer);
SCSI_DEVICE_ENTRIES(pt)
struct scsi_device pt_switch =
{
pt_sense,
ptstart, /* we have a queue, and this is how we service it */
NULL,
NULL,
"pt",
0,
{0, 0},
SDEV_ONCE_ONLY, /* Only one open allowed */
0,
"Processor",
ptopen,
sizeof(struct scsi_data),
T_PROCESSOR,
0,
0,
0,
0,
0,
pt_strategy,
};
/*
* ptstart looks to see if there is a buf waiting for the device
* and that the device is not already busy. If both are true,
* It dequeues the buf and creates a scsi command to perform the
* transfer required. The transfer request will call scsi_done
* on completion, which will in turn call this routine again
* so that the next queued transfer is performed.
* The bufs are queued by the strategy routine (ptstrategy)
*
* This routine is also called after other non-queued requests
* have been made of the scsi driver, to ensure that the queue
* continues to be drained.
* ptstart() is called at splbio
*/
void
ptstart(unit, flags)
u_int32 unit;
u_int32 flags;
{
struct scsi_link *sc_link = SCSI_LINK(&pt_switch, unit);
struct scsi_data *pt = sc_link->sd;
register struct buf *bp = 0;
struct
{
#define PROCESSOR_SEND 0x0A
#define PROCESSOR_RECEIVE 0x08
u_char op_code;
u_char byte2;
u_char len[3];
u_char control;
} cmd;
SC_DEBUG(sc_link, SDEV_DB2, ("ptstart "));
/*
* See if there is a buf to do and we are not already
* doing one
*/
while (sc_link->opennings != 0) {
/* if a special awaits, let it proceed first */
if (sc_link->flags & SDEV_WAITING) {
sc_link->flags &= ~SDEV_WAITING;
wakeup((caddr_t)sc_link);
return;
}
if ((bp = pt->buf_queue) == NULL) {
return; /* no work to bother with */
}
pt->buf_queue = bp->b_actf;
/*
* Fill out the scsi command
*/
bzero(&cmd, sizeof(cmd));
if ((bp->b_flags & B_READ) == B_WRITE) {
cmd.op_code = PROCESSOR_SEND;
flags |= SCSI_DATA_OUT;
} else {
cmd.op_code = PROCESSOR_RECEIVE;
flags |= SCSI_DATA_IN;
}
scsi_uto3b(bp->b_bcount, cmd.len);
/*
* go ask the adapter to do all this for us
*/
if (scsi_scsi_cmd(sc_link,
(struct scsi_generic *) &cmd,
sizeof(cmd),
(u_char *) bp->b_un.b_addr,
bp->b_bcount,
0,
10000,
bp,
flags) == SUCCESSFULLY_QUEUED) {
} else {
printf("pt%ld: oops not queued\n", unit);
bp->b_flags |= B_ERROR;
bp->b_error = EIO;
biodone(bp);
}
} /* go back and see if we can cram more work in.. */
}
void
pt_strategy(struct buf *bp, struct scsi_link *sc_link)
{
struct buf **dp;
unsigned char unit;
u_int32 opri;
struct scsi_data *pt;
unit = minor((bp->b_dev));
pt = sc_link->sd;
opri = splbio();
/*
* Use a bounce buffer if necessary
*/
#ifdef BOUNCE_BUFFERS
if (sc_link->flags & SDEV_BOUNCE)
vm_bounce_alloc(bp);
#endif
/*
* Place it in the queue of activities for this tape
* at the end (a bit silly because we only have one user..
* (but it could fork() ))
*/
dp = &(pt->buf_queue);
while (*dp) {
dp = &((*dp)->b_actf);
}
*dp = bp;
bp->b_actf = NULL;
/*
* Tell the device to get going on the transfer if it's
* not doing anything, otherwise just wait for completion
* (All a bit silly if we're only allowing 1 open but..)
*/
ptstart(unit, 0);
splx(opri);
return;
}
/*
* sense handler: Called to determine what to do when the
* device returns a CHECK CONDITION.
*
* For the processor type devices we try to handle the "info" field.
*/
int pt_sense(struct scsi_xfer *xs)
{
struct scsi_sense_data *sense = &(xs->sense);
struct buf *bp;
long resid;
if ((sense->error_code & SSD_ERRCODE_VALID) == 0 ||
(sense->ext.extended.flags & SSD_ILI) == 0) {
return SCSIRET_CONTINUE; /* let the default handler handle it */
}
resid = ntohl(*((int32 *) sense->ext.extended.info));
bp = xs->bp;
if (resid < 0) {
/* It synthesized data in order to fill our request.
* Move resid back to cover this.
*/
xs->resid = -resid;
xs->flags |= SCSI_RESID_VALID;
return 0;
}
else {
/* It wanted to send more data. We can't really do anything
* about this.
*/
return SCSIRET_CONTINUE;
}
}
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