273 lines
7.1 KiB
C
273 lines
7.1 KiB
C
/*
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* sctarg: Processor Type driver.
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*
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* Copyright (C) 1995, HD Associates, Inc.
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* PO Box 276
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* Pepperell, MA 01463
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* 508 433 5266
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* dufault@hda.com
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*
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* This code is contributed to the University of California at Berkeley:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: sctarg.c,v 1.3 1995/05/30 08:13:49 rgrimes Exp $
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*/
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/*
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* XXX dufault@hda.com: We need the "kern devconf" stuff, but I'm not
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* going to add it until it is done in a simple way that provides
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* base behavior in scsi_driver.c
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/buf.h>
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#include <sys/proc.h>
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#include <scsi/scsi_all.h>
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#include <scsi/scsiconf.h>
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#define OPEN 0x01
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struct scsi_data {
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struct buf *buf_queue; /* the queue of pending IO operations */
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int flags; /* Already open */
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};
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errval sctarg_open(dev_t dev, int flags, int fmt, struct proc *p,
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struct scsi_link *sc_link);
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void sctargstart(u_int32 unit, u_int32 unused_flags);
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errval sctarg_close(dev_t dev, int flag, int fmt, struct proc *p,
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struct scsi_link *sc_link);
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void sctarg_strategy(struct buf *bp, struct scsi_link *sc_link);
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SCSI_DEVICE_ENTRIES(sctarg)
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struct scsi_device sctarg_switch =
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{
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NULL,
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sctargstart, /* we have a queue, and this is how we service it */
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NULL,
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NULL,
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"sctarg",
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0,
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{0, 0},
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SDEV_ONCE_ONLY,
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0,
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"Processor Target",
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sctargopen,
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sizeof(struct scsi_data),
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T_TARGET,
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0,
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0,
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sctarg_open,
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0,
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0,
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sctarg_strategy,
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};
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errval sctarg_open(dev_t dev, int flags, int fmt, struct proc *p,
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struct scsi_link *sc_link)
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{
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int ret = 0;
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/* Does this host adapter support target mode operation?
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*/
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if ((sc_link->flags & SDEV_TARGET_OPS) == 0)
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return ENODEV; /* Operation not supported */
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if (SCSI_FIXED(dev)) {
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sc_link->scsibus = SCSI_BUS(dev);
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scsi_set_bus(sc_link->scsibus, sc_link);
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sc_link->target = SCSI_ID(dev);
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sc_link->lun = SCSI_LUN(dev);
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}
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if (sc_link->scsibus == SCCONF_UNSPEC ||
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sc_link->target == SCCONF_UNSPEC ||
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sc_link->lun == SCCONF_UNSPEC)
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return ENXIO;
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/* XXX: You can have more than one target device on a single
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* host adapter. We need a reference count.
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*/
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if ((sc_link->sd->flags & OPEN) == 0) /* Enable target mode */
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{
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ret = scsi_target_mode(sc_link, 1);
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sc_link->sd->flags |= OPEN;
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}
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return ret;
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}
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errval sctarg_close(dev_t dev, int flags, int fmt, struct proc *p,
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struct scsi_link *sc_link)
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{
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int ret = 0;
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/* XXX: You can have more than one target device on a single
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* host adapter. We need a reference count.
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*/
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ret = scsi_target_mode(sc_link, 0);
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sc_link->sd->flags &= ~OPEN;
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return ret;
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}
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/*
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* sctargstart looks to see if there is a buf waiting for the device
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* and that the device is not already busy. If both are true,
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* It dequeues the buf and creates a scsi command to perform the
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* transfer required. The transfer request will call scsi_done
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* on completion, which will in turn call this routine again
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* so that the next queued transfer is performed.
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* The bufs are queued by the strategy routine (sctargstrategy)
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*
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* This routine is also called after other non-queued requests
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* have been made of the scsi driver, to ensure that the queue
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* continues to be drained.
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* sctargstart() is called at splbio
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*/
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void
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sctargstart(unit, unused_flags)
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u_int32 unit;
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u_int32 unused_flags;
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{
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struct scsi_link *sc_link = SCSI_LINK(&sctarg_switch, unit);
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struct scsi_data *sctarg = sc_link->sd;
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register struct buf *bp = 0;
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struct
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{
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#define PROCESSOR_SEND 0x0A
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#define PROCESSOR_RECEIVE 0x08
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u_char op_code;
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u_char byte2;
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u_char len[3];
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u_char control;
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} cmd;
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u_int32 flags;
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SC_DEBUG(sc_link, SDEV_DB2, ("sctargstart "));
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/*
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* See if there is a buf to do and we are not already
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* doing one
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*/
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while (sc_link->opennings != 0) {
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/* if a special awaits, let it proceed first */
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if (sc_link->flags & SDEV_WAITING) {
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sc_link->flags &= ~SDEV_WAITING;
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wakeup((caddr_t)sc_link);
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return;
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}
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if ((bp = sctarg->buf_queue) == NULL) {
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return; /* no work to bother with */
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}
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sctarg->buf_queue = bp->b_actf;
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/*
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* Fill out the scsi command
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*/
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bzero(&cmd, sizeof(cmd));
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flags = SCSI_TARGET;
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if ((bp->b_flags & B_READ) == B_WRITE) {
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cmd.op_code = PROCESSOR_SEND;
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flags |= SCSI_DATA_OUT;
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} else {
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cmd.op_code = PROCESSOR_RECEIVE;
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flags |= SCSI_DATA_IN;
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}
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scsi_uto3b(bp->b_bcount, cmd.len);
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/*
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* go ask the adapter to do all this for us
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*/
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if (scsi_scsi_cmd(sc_link,
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(struct scsi_generic *) &cmd,
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sizeof(cmd),
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(u_char *) bp->b_un.b_addr,
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bp->b_bcount,
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0,
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100000,
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bp,
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flags | SCSI_NOSLEEP) == SUCCESSFULLY_QUEUED) {
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} else {
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printf("sctarg%ld: oops not queued\n", unit);
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bp->b_flags |= B_ERROR;
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bp->b_error = EIO;
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biodone(bp);
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}
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} /* go back and see if we can cram more work in.. */
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}
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void
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sctarg_strategy(struct buf *bp, struct scsi_link *sc_link)
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{
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struct buf **dp;
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unsigned char unit;
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u_int32 opri;
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struct scsi_data *sctarg;
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unit = minor((bp->b_dev));
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sctarg = sc_link->sd;
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opri = splbio();
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/*
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* Use a bounce buffer if necessary
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*/
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#ifdef BOUNCE_BUFFERS
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if (sc_link->flags & SDEV_BOUNCE)
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vm_bounce_alloc(bp);
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#endif
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/*
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* Place it at the end of the queue of activities for this device.
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*/
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dp = &(sctarg->buf_queue);
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while (*dp) {
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dp = &((*dp)->b_actf);
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}
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*dp = bp;
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bp->b_actf = NULL;
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/*
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* Tell the device to get going on the transfer if it's
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* not doing anything, otherwise just wait for completion
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* (All a bit silly if we're only allowing 1 open but..)
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*/
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sctargstart(unit, 0);
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splx(opri);
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return;
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}
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