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freebsd-dev/sys/dev/ppbus/vpo.c

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/*-
* Copyright (c) 1997 Nicolas Souchu
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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: vpo.c,v 1.3 1997/08/28 10:15:20 msmith Exp $
*
*/
#ifdef KERNEL
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/buf.h>
#include <machine/clock.h>
#endif /* KERNEL */
#include <scsi/scsi_disk.h>
#include <scsi/scsiconf.h>
#ifdef KERNEL
#include <sys/kernel.h>
#endif /*KERNEL */
#include <dev/ppbus/ppbconf.h>
#include <dev/ppbus/vpo.h>
/* --------------------------------------------------------------------
* HERE ARE THINGS YOU MAY HAVE/WANT TO CHANGE
*/
/*
* XXX
* We may add a timeout queue to avoid active polling on nACK.
*/
#define VP0_SELTMO 5000 /* select timeout */
#define VP0_FAST_SPINTMO 500000 /* wait status timeout */
#define VP0_LOW_SPINTMO 5000000 /* wait status timeout */
/*
* DO NOT MODIFY ANYTHING UNDER THIS LINE
* --------------------------------------------------------------------
*/
static inline int vpoio_do_scsi(struct vpo_data *, int, int, char *, int,
char *, int, int *, int *);
static int32_t vpo_scsi_cmd(struct scsi_xfer *);
static void vpominphys(struct buf *);
static u_int32_t vpo_adapter_info(int);
static int vpo_detect(struct vpo_data *vpo);
static int nvpo = 0;
#define MAXVP0 8 /* XXX not much better! */
static struct vpo_data *vpodata[MAXVP0];
#ifdef KERNEL
static struct scsi_adapter vpo_switch =
{
vpo_scsi_cmd,
vpominphys,
0,
0,
vpo_adapter_info,
"vpo",
{ 0, 0 }
};
/*
* The below structure is so we have a default dev struct
* for out link struct.
*/
static struct scsi_device vpo_dev =
{
NULL, /* Use default error handler */
NULL, /* have a queue, served by this */
NULL, /* have no async handler */
NULL, /* Use default 'done' routine */
"vpo",
0,
{ 0, 0 }
};
/*
* Make ourselves visible as a ppbus driver
*/
static struct ppb_device *vpoprobe(struct ppb_data *ppb);
static int vpoattach(struct ppb_device *dev);
static struct ppb_driver vpodriver = {
vpoprobe, vpoattach, "vpo"
};
DATA_SET(ppbdriver_set, vpodriver);
#endif /* KERNEL */
static u_int32_t
vpo_adapter_info(int unit)
{
return 1;
}
/*
* vpoprobe()
*
* Called by ppb_attachdevs().
*/
static struct ppb_device *
vpoprobe(struct ppb_data *ppb)
{
struct vpo_data *vpo;
if (nvpo >= MAXVP0) {
printf("vpo: Too many devices (max %d)\n", MAXVP0);
return(NULL);
}
vpo = (struct vpo_data *)malloc(sizeof(struct vpo_data),
M_DEVBUF, M_NOWAIT);
if (!vpo) {
printf("vpo: cannot malloc!\n");
return(NULL);
}
bzero(vpo, sizeof(struct vpo_data));
vpodata[nvpo] = vpo;
/* vpo dependent initialisation */
vpo->vpo_unit = nvpo;
/* ppbus dependent initialisation */
vpo->vpo_dev.id_unit = vpo->vpo_unit;
vpo->vpo_dev.ppb = ppb;
/* now, try to initialise the drive */
if (vpo_detect(vpo)) {
free(vpo, M_DEVBUF);
return (NULL);
}
/* ok, go to next device on next probe */
nvpo ++;
return (&vpo->vpo_dev);
}
/*
* vpoattach()
*
* Called by ppb_attachdevs().
*/
static int
vpoattach(struct ppb_device *dev)
{
struct scsibus_data *scbus;
struct vpo_data *vpo = vpodata[dev->id_unit];
vpo->sc_link.adapter_unit = vpo->vpo_unit;
vpo->sc_link.adapter_targ = VP0_INITIATOR;
vpo->sc_link.adapter = &vpo_switch;
vpo->sc_link.device = &vpo_dev;
vpo->sc_link.opennings = VP0_OPENNINGS;
/*
* Report ourselves
*/
printf("vpo%d: <Adaptec aic7110 scsi> on ppbus %d\n",
dev->id_unit, dev->ppb->ppb_link->adapter_unit);
/*
* Prepare the scsibus_data area for the upperlevel
* scsi code.
*/
scbus = scsi_alloc_bus();
if(!scbus)
return (0);
scbus->adapter_link = &vpo->sc_link;
scsi_attachdevs(scbus);
return (1);
}
static void
vpominphys(struct buf *bp)
{
if (bp->b_bcount > VP0_BUFFER_SIZE)
bp->b_bcount = VP0_BUFFER_SIZE;
return;
}
#ifdef VP0_WARNING
static inline void
vpo_warning(struct vpo_data *vpo, struct scsi_xfer *xs, int timeout)
{
switch (timeout) {
case 0:
case VP0_ESELECT_TIMEOUT:
/* log(LOG_WARNING,
"vpo%d: select timeout\n", vpo->vpo_unit); */
break;
case VP0_EDISCONNECT:
log(LOG_WARNING,
"vpo%d: can't get printer state\n", vpo->vpo_unit);
break;
case VP0_ECONNECT:
log(LOG_WARNING,
"vpo%d: can't get disk state\n", vpo->vpo_unit);
break;
case VP0_ECMD_TIMEOUT:
log(LOG_WARNING,
"vpo%d: command timeout\n", vpo->vpo_unit);
break;
case VP0_EPPDATA_TIMEOUT:
log(LOG_WARNING,
"vpo%d: EPP data timeout\n", vpo->vpo_unit);
break;
case VP0_ESTATUS_TIMEOUT:
log(LOG_WARNING,
"vpo%d: status timeout\n", vpo->vpo_unit);
break;
case VP0_EDATA_OVERFLOW:
log(LOG_WARNING,
"vpo%d: data overflow\n", vpo->vpo_unit);
break;
case VP0_EINTR:
log(LOG_WARNING,
"vpo%d: ppb request interrupted\n", vpo->vpo_unit);
break;
default:
log(LOG_WARNING,
"vpo%d: timeout = %d\n", vpo->vpo_unit, timeout);
break;
}
}
#endif /* VP0_WARNING */
/*
* vpointr()
*/
static inline void
vpointr(struct vpo_data *vpo, struct scsi_xfer *xs)
{
int errno; /* error in errno.h */
if (xs->datalen && !(xs->flags & SCSI_DATA_IN))
bcopy(xs->data, vpo->vpo_buffer, xs->datalen);
errno = vpoio_do_scsi(vpo, VP0_INITIATOR,
xs->sc_link->target, (char *)xs->cmd, xs->cmdlen,
vpo->vpo_buffer, xs->datalen, &vpo->vpo_stat, &vpo->vpo_count);
#ifdef VP0_DEBUG
printf("vpo_do_scsi = %d, status = 0x%x, count = %d, vpo_error = %d\n",
errno, vpo->vpo_stat, vpo->vpo_count, vpo->vpo_error);
#endif
if (errno) {
#ifdef VP0_WARNING
log(LOG_WARNING, "vpo%d: errno = %d\n", vpo->vpo_unit, errno);
#endif
/* connection to ppbus interrupted */
xs->error = XS_DRIVER_STUFFUP;
goto error;
}
/* if a timeout occured, no sense */
if (vpo->vpo_error) {
#ifdef VP0_WARNING
vpo_warning(vpo, xs, vpo->vpo_error);
#endif
xs->error = XS_TIMEOUT;
goto error;
}
#define RESERVED_BITS_MASK 0x3e /* 00111110b */
#define NO_SENSE 0x0
#define CHECK_CONDITION 0x02
switch (vpo->vpo_stat & RESERVED_BITS_MASK) {
case NO_SENSE:
break;
case CHECK_CONDITION:
vpo->vpo_sense.cmd.op_code = REQUEST_SENSE;
vpo->vpo_sense.cmd.length = sizeof(xs->sense);
vpo->vpo_sense.cmd.control = 0;
errno = vpoio_do_scsi(vpo, VP0_INITIATOR,
xs->sc_link->target, (char *)&vpo->vpo_sense.cmd,
sizeof(vpo->vpo_sense.cmd),
(char *)&xs->sense, sizeof(xs->sense),
&vpo->vpo_sense.stat, &vpo->vpo_sense.count);
if (errno)
/* connection to ppbus interrupted */
xs->error = XS_DRIVER_STUFFUP;
else
xs->error = XS_SENSE;
goto error;
default: /* BUSY or RESERVATION_CONFLICT */
xs->error = XS_TIMEOUT;
goto error;
}
if (xs->datalen && (xs->flags & SCSI_DATA_IN))
bcopy(vpo->vpo_buffer, xs->data, xs->datalen);
done:
xs->resid = 0;
xs->error = XS_NOERROR;
error:
xs->flags |= ITSDONE;
scsi_done(xs);
return;
}
static int32_t
vpo_scsi_cmd(struct scsi_xfer *xs)
{
int s;
if (xs->sc_link->lun > 0) {
xs->error = XS_DRIVER_STUFFUP;
return TRY_AGAIN_LATER;
}
if (xs->flags & SCSI_DATA_UIO) {
printf("UIO not supported by vpo_driver !\n");
xs->error = XS_DRIVER_STUFFUP;
return TRY_AGAIN_LATER;
}
#ifdef VP0_DEBUG
printf("vpo_scsi_cmd(): xs->flags = 0x%x, "\
"xs->data = 0x%x, xs->datalen = %d\ncommand : %*D\n",
xs->flags, xs->data, xs->datalen,
xs->cmdlen, xs->cmd, " " );
#endif
if (xs->flags & SCSI_NOMASK) {
vpointr(vpodata[xs->sc_link->adapter_unit], xs);
return COMPLETE;
}
s = VP0_SPL();
vpointr(vpodata[xs->sc_link->adapter_unit], xs);
splx(s);
return SUCCESSFULLY_QUEUED;
}
#define vpoio_d_pulse(vpo,b) { \
ppb_wdtr(&(vpo)->vpo_dev, b); \
ppb_wctr(&(vpo)->vpo_dev, H_AUTO | H_nSELIN | H_INIT | H_STROBE); \
ppb_wctr(&(vpo)->vpo_dev, H_nAUTO | H_nSELIN | H_INIT | H_STROBE); \
ppb_wctr(&(vpo)->vpo_dev, H_nAUTO | H_nSELIN | H_INIT | H_STROBE); \
ppb_wctr(&(vpo)->vpo_dev, H_nAUTO | H_nSELIN | H_INIT | H_STROBE); \
ppb_wctr(&(vpo)->vpo_dev, H_AUTO | H_nSELIN | H_INIT | H_STROBE); \
ppb_wctr(&(vpo)->vpo_dev, H_AUTO | H_SELIN | H_INIT | H_STROBE); \
ppb_wctr(&(vpo)->vpo_dev, H_AUTO | H_SELIN | H_INIT | H_STROBE); \
ppb_wctr(&(vpo)->vpo_dev, H_AUTO | H_SELIN | H_INIT | H_STROBE); \
ppb_wctr(&(vpo)->vpo_dev, H_AUTO | H_nSELIN | H_INIT | H_STROBE); \
ppb_wctr(&(vpo)->vpo_dev, H_AUTO | H_nSELIN | H_INIT | H_STROBE); \
ppb_wctr(&(vpo)->vpo_dev, H_AUTO | H_nSELIN | H_INIT | H_STROBE); \
}
#define vpoio_c_pulse(vpo,b) { \
ppb_wdtr(&(vpo)->vpo_dev, b); \
ppb_wctr(&(vpo)->vpo_dev, H_AUTO | H_nSELIN | H_INIT | H_STROBE); \
ppb_wctr(&(vpo)->vpo_dev, H_AUTO | H_SELIN | H_INIT | H_STROBE); \
ppb_wctr(&(vpo)->vpo_dev, H_nAUTO | H_SELIN | H_INIT | H_STROBE); \
ppb_wctr(&(vpo)->vpo_dev, H_nAUTO | H_SELIN | H_INIT | H_STROBE); \
ppb_wctr(&(vpo)->vpo_dev, H_nAUTO | H_SELIN | H_INIT | H_STROBE); \
ppb_wctr(&(vpo)->vpo_dev, H_AUTO | H_SELIN | H_INIT | H_STROBE); \
ppb_wctr(&(vpo)->vpo_dev, H_AUTO | H_nSELIN | H_INIT | H_STROBE); \
ppb_wctr(&(vpo)->vpo_dev, H_AUTO | H_nSELIN | H_INIT | H_STROBE); \
ppb_wctr(&(vpo)->vpo_dev, H_AUTO | H_nSELIN | H_INIT | H_STROBE); \
}
static int
vpoio_disconnect(struct vpo_data *vpo)
{
vpoio_d_pulse(vpo, 0);
vpoio_d_pulse(vpo, 0x3c);
vpoio_d_pulse(vpo, 0x20);
vpoio_d_pulse(vpo, 0xf);
return (ppb_release_bus(&vpo->vpo_dev));
}
/*
* how : PPB_WAIT or PPB_DONTWAIT
*/
static int
vpoio_connect(struct vpo_data *vpo, int how)
{
int error;
if ((error = ppb_request_bus(&vpo->vpo_dev, how)))
return error;
vpoio_c_pulse(vpo, 0);
vpoio_c_pulse(vpo, 0x3c);
vpoio_c_pulse(vpo, 0x20);
if (PPB_IN_EPP_MODE(&vpo->vpo_dev)) {
vpoio_c_pulse(vpo, 0xcf);
} else {
vpoio_c_pulse(vpo, 0x8f);
}
return (0);
}
/*
* vpoio_in_disk_mode()
*
* Check if we are in disk mode
*/
static int
vpoio_in_disk_mode(struct vpo_data *vpo)
{
/* first, set H_AUTO high */
ppb_wctr(&vpo->vpo_dev, H_AUTO | H_nSELIN | H_INIT | H_STROBE);
/* when H_AUTO is set low, H_FLT should be high */
ppb_wctr(&vpo->vpo_dev, H_nAUTO | H_nSELIN | H_INIT | H_STROBE);
if ((ppb_rstr(&vpo->vpo_dev) & H_FLT) == 0)
return (0);
/* when H_AUTO is set high, H_FLT should be low */
ppb_wctr(&vpo->vpo_dev, H_AUTO | H_nSELIN | H_INIT | H_STROBE);
if ((ppb_rstr(&vpo->vpo_dev) & H_FLT) != 0)
return (0);
return (1);
}
/*
* vpoio_reset()
*
* SCSI reset signal, the drive must be in disk mode
*/
static void
vpoio_reset (struct vpo_data *vpo)
{
/*
* SCSI reset signal.
*/
ppb_wdtr(&vpo->vpo_dev, (1 << 7));
ppb_wctr(&vpo->vpo_dev, H_AUTO | H_nSELIN | H_nINIT | H_STROBE);
DELAY(25);
ppb_wctr(&vpo->vpo_dev, H_AUTO | H_nSELIN | H_INIT | H_STROBE);
return;
}
/*
* vpo_detect()
*
* Detect and initialise the VP0 adapter.
*/
static int
vpo_detect(struct vpo_data *vpo)
{
vpoio_disconnect(vpo);
vpoio_connect(vpo, PPB_DONTWAIT);
if (!vpoio_in_disk_mode(vpo)) {
vpoio_disconnect(vpo);
return (VP0_EINITFAILED);
}
/* send SCSI reset signal */
vpoio_reset (vpo);
vpoio_disconnect(vpo);
if (vpoio_in_disk_mode(vpo))
return (VP0_EINITFAILED);
return (0);
}
#define vpo_wctr(dev,byte,delay) { \
int i; int iter = delay / MHZ_16_IO_DURATION; \
for (i = 0; i < iter; i++) { \
ppb_wctr(dev, byte); \
} \
}
#define vpoio_spp_outbyte(vpo,byte) { \
ppb_wdtr(&vpo->vpo_dev, byte); \
ppb_wctr(&vpo->vpo_dev, H_nAUTO | H_nSELIN | H_INIT | H_STROBE); \
vpo_wctr(&vpo->vpo_dev, H_AUTO | H_nSELIN | H_INIT | H_STROBE, \
VP0_SPP_WRITE_PULSE); \
}
#define vpoio_nibble_inbyte(vpo,buffer) { \
register char h, l; \
vpo_wctr(&vpo->vpo_dev, H_AUTO | H_SELIN | H_INIT | H_STROBE, \
VP0_NIBBLE_READ_PULSE); \
h = ppb_rstr(&vpo->vpo_dev); \
ppb_wctr(&vpo->vpo_dev, H_nAUTO | H_SELIN | H_INIT | H_STROBE); \
l = ppb_rstr(&vpo->vpo_dev); \
*buffer = ((l >> 4) & 0x0f) + (h & 0xf0); \
}
#define vpoio_ps2_inbyte(vpo,buffer) { \
*buffer = ppb_rdtr(&vpo->vpo_dev); \
ppb_wctr(&vpo->vpo_dev, PCD | H_nAUTO | H_SELIN | H_INIT | H_nSTROBE); \
ppb_wctr(&vpo->vpo_dev, PCD | H_AUTO | H_SELIN | H_INIT | H_nSTROBE); \
}
/*
* vpoio_outstr()
*/
static int
vpoio_outstr(struct vpo_data *vpo, char *buffer, int size)
{
register int k;
int error = 0;
int r, mode, epp;
mode = ppb_get_mode(&vpo->vpo_dev);
switch (mode) {
case PPB_NIBBLE:
case PPB_PS2:
for (k = 0; k < size; k++) {
vpoio_spp_outbyte(vpo, *buffer++);
}
break;
case PPB_EPP:
case PPB_ECP_EPP:
epp = ppb_get_epp_protocol(&vpo->vpo_dev);
ppb_reset_epp_timeout(&vpo->vpo_dev);
ppb_wctr(&vpo->vpo_dev,
H_AUTO | H_SELIN | H_INIT | H_STROBE);
if (epp == EPP_1_7)
for (k = 0; k < size; k++) {
ppb_wepp(&vpo->vpo_dev, *buffer++);
if ((ppb_rstr(&vpo->vpo_dev) & TIMEOUT)) {
error = VP0_EPPDATA_TIMEOUT;
break;
}
}
else {
if (((long) buffer | size) & 0x03)
ppb_outsb_epp(&vpo->vpo_dev,
buffer, size);
else
ppb_outsl_epp(&vpo->vpo_dev,
buffer, size/4);
if ((ppb_rstr(&vpo->vpo_dev) & TIMEOUT)) {
error = VP0_EPPDATA_TIMEOUT;
break;
}
}
ppb_wctr(&vpo->vpo_dev,
H_AUTO | H_nSELIN | H_INIT | H_STROBE);
/* ppb_ecp_sync(&vpo->vpo_dev); */
break;
default:
printf("vpoio_outstr(): unknown transfer mode (%d)!\n",
mode);
return (1); /* XXX */
}
return (error);
}
/*
* vpoio_instr()
*/
static int
vpoio_instr(struct vpo_data *vpo, char *buffer, int size)
{
register int k;
int error = 0;
int r, mode, epp;
mode = ppb_get_mode(&vpo->vpo_dev);
switch (mode) {
case PPB_NIBBLE:
for (k = 0; k < size; k++) {
vpoio_nibble_inbyte(vpo, buffer++);
}
ppb_wctr(&vpo->vpo_dev,
H_AUTO | H_nSELIN | H_INIT | H_STROBE);
break;
case PPB_PS2:
ppb_wctr(&vpo->vpo_dev, PCD |
H_AUTO | H_SELIN | H_INIT | H_nSTROBE);
for (k = 0; k < size; k++) {
vpoio_ps2_inbyte(vpo, buffer++);
}
ppb_wctr(&vpo->vpo_dev,
H_AUTO | H_nSELIN | H_INIT | H_STROBE);
break;
case PPB_EPP:
case PPB_ECP_EPP:
epp = ppb_get_epp_protocol(&vpo->vpo_dev);
ppb_reset_epp_timeout(&vpo->vpo_dev);
ppb_wctr(&vpo->vpo_dev, PCD |
H_AUTO | H_SELIN | H_INIT | H_STROBE);
if (epp == EPP_1_7)
for (k = 0; k < size; k++) {
*buffer++ = ppb_repp(&vpo->vpo_dev);
if ((ppb_rstr(&vpo->vpo_dev) & TIMEOUT)) {
error = VP0_EPPDATA_TIMEOUT;
break;
}
}
else {
if (((long) buffer | size) & 0x03)
ppb_insb_epp(&vpo->vpo_dev,
buffer, size);
else
ppb_insl_epp(&vpo->vpo_dev,
buffer, size/4);
if ((ppb_rstr(&vpo->vpo_dev) & TIMEOUT)) {
error = VP0_EPPDATA_TIMEOUT;
break;
}
}
ppb_wctr(&vpo->vpo_dev, PCD |
H_AUTO | H_nSELIN | H_INIT | H_STROBE);
/* ppb_ecp_sync(&vpo->vpo_dev); */
break;
default:
printf("vpoio_instr(): unknown transfer mode (%d)!\n",
mode);
return (1); /* XXX */
}
return (error);
}
static inline char
vpoio_select(struct vpo_data *vpo, int initiator, int target)
{
register int k;
ppb_wdtr(&vpo->vpo_dev, (1 << target));
ppb_wctr(&vpo->vpo_dev, H_nAUTO | H_nSELIN | H_INIT | H_STROBE);
ppb_wctr(&vpo->vpo_dev, H_AUTO | H_nSELIN | H_INIT | H_STROBE);
ppb_wdtr(&vpo->vpo_dev, (1 << initiator));
ppb_wctr(&vpo->vpo_dev, H_AUTO | H_nSELIN | H_nINIT | H_STROBE);
k = 0;
while (!(ppb_rstr(&vpo->vpo_dev) & 0x40) && (k++ < VP0_SELTMO))
barrier();
if (k >= VP0_SELTMO)
return (VP0_ESELECT_TIMEOUT);
return (0);
}
/*
* vpoio_wait()
*
* H_SELIN must be low.
*/
static inline char
vpoio_wait(struct vpo_data *vpo, int tmo)
{
register int k;
register char r;
#if 0 /* broken */
if (ppb_poll_device(&vpo->vpo_dev, 150, nBUSY, nBUSY, PPB_INTR))
return (0);
return (ppb_rstr(&vpo->vpo_dev) & 0xf0);
#endif
k = 0;
while (!((r = ppb_rstr(&vpo->vpo_dev)) & nBUSY) && (k++ < tmo))
barrier();
/*
* Return some status information.
* Semantics : 0xc0 = ZIP wants more data
* 0xd0 = ZIP wants to send more data
* 0xe0 = ZIP wants command
* 0xf0 = end of transfer, ZIP is sending status
*/
if (k < tmo)
return (r & 0xf0);
return (0); /* command timed out */
}
static inline int
vpoio_do_scsi(struct vpo_data *vpo, int host, int target, char *command,
int clen, char *buffer, int blen, int *result, int *count)
{
register char r;
char l, h = 0;
int rw, len, error = 0;
register int k;
/*
* enter disk state, allocate the ppbus
*
* XXX
* Should we allow this call to be interruptible?
* The only way to report the interruption is to return
* EIO do upper SCSI code :^(
*/
if ((error = vpoio_connect(vpo, PPB_WAIT|PPB_INTR)))
return (error);
if (!vpoio_in_disk_mode(vpo)) {
vpo->vpo_error = VP0_ECONNECT; goto error;
}
if ((vpo->vpo_error = vpoio_select(vpo,host,target)))
goto error;
/*
* Send the command ...
*
* set H_SELIN low for vpoio_wait().
*/
ppb_wctr(&vpo->vpo_dev, H_AUTO | H_nSELIN | H_INIT | H_STROBE);
#ifdef VP0_DEBUG
printf("vpo%d: drive selected, now sending the command...\n",
vpo->vpo_unit);
#endif
for (k = 0; k < clen; k++) {
if (vpoio_wait(vpo, VP0_FAST_SPINTMO) != (char)0xe0) {
vpo->vpo_error = VP0_ECMD_TIMEOUT;
goto error;
}
if (vpoio_outstr(vpo, &command[k], 1)) {
vpo->vpo_error = VP0_EPPDATA_TIMEOUT;
goto error;
}
}
#ifdef VP0_DEBUG
printf("vpo%d: command sent, now completing the request...\n",
vpo->vpo_unit);
#endif
/*
* Completion ...
*/
rw = ((command[0] == READ_COMMAND) || (command[0] == READ_BIG) ||
(command[0] == WRITE_COMMAND) || (command[0] == WRITE_BIG));
*count = 0;
for (;;) {
if (!(r = vpoio_wait(vpo, VP0_LOW_SPINTMO))) {
vpo->vpo_error = VP0_ESTATUS_TIMEOUT; goto error;
}
/* stop when the ZIP wants to send status */
if (r == (char)0xf0)
break;
if (*count >= blen) {
vpo->vpo_error = VP0_EDATA_OVERFLOW;
goto error;
}
len = (rw && ((blen - *count) >= VP0_SECTOR_SIZE)) ?
VP0_SECTOR_SIZE : 1;
/* ZIP wants to send data? */
if (r == (char)0xc0)
error = vpoio_outstr(vpo, &buffer[*count], len);
else
error = vpoio_instr(vpo, &buffer[*count], len);
if (error) {
vpo->vpo_error = error;
goto error;
}
*count += len;
}
if (vpoio_instr(vpo, &l, 1)) {
vpo->vpo_error = VP0_EOTHER; goto error;
}
/* check if the ZIP wants to send more status */
if (vpoio_wait(vpo, VP0_FAST_SPINTMO) == (char)0xf0)
if (vpoio_instr(vpo, &h, 1)) {
vpo->vpo_error = VP0_EOTHER+2; goto error;
}
*result = ((int) h << 8) | ((int) l & 0xff);
error:
/* return to printer state, release the ppbus */
vpoio_disconnect(vpo);
return (0);
}
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