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NetBSD/sys/dev/sbus/isp_sbus.c
keihan b8702f530b netbsd.org -> NetBSD.org 
This was the last commit of this kind to src/sys, which is now totally
"NetBSD.org clean".  Thanks for the patiance, and sorry for all the commits.
2003-12-04 13:57:30 +00:00

612 lines
17 KiB
C
Raw Blame History

/* $NetBSD: isp_sbus.c,v 1.61 2003/12/04 13:57:31 keihan Exp $ */
/*
* This driver, which is contained in NetBSD in the files:
*
* sys/dev/ic/isp.c
* sys/dev/ic/isp_inline.h
* sys/dev/ic/isp_netbsd.c
* sys/dev/ic/isp_netbsd.h
* sys/dev/ic/isp_target.c
* sys/dev/ic/isp_target.h
* sys/dev/ic/isp_tpublic.h
* sys/dev/ic/ispmbox.h
* sys/dev/ic/ispreg.h
* sys/dev/ic/ispvar.h
* sys/microcode/isp/asm_sbus.h
* sys/microcode/isp/asm_1040.h
* sys/microcode/isp/asm_1080.h
* sys/microcode/isp/asm_12160.h
* sys/microcode/isp/asm_2100.h
* sys/microcode/isp/asm_2200.h
* sys/pci/isp_pci.c
* sys/sbus/isp_sbus.c
*
* Is being actively maintained by Matthew Jacob (mjacob@NetBSD.org).
* This driver also is shared source with FreeBSD, OpenBSD, Linux, Solaris,
* Linux versions. This tends to be an interesting maintenance problem.
*
* Please coordinate with Matthew Jacob on changes you wish to make here.
*/
/*
* SBus specific probe and attach routines for Qlogic ISP SCSI adapters.
*
* Copyright (c) 1997, 2001 by Matthew Jacob
* NASA AMES Research Center
* 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 immediately at the beginning of the file, without modification,
* 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.
*
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: isp_sbus.c,v 1.61 2003/12/04 13:57:31 keihan Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <dev/ic/isp_netbsd.h>
#include <machine/intr.h>
#include <machine/autoconf.h>
#include <dev/microcode/isp/asm_sbus.h>
#include <dev/sbus/sbusvar.h>
#include <sys/reboot.h>
static void isp_sbus_reset1(struct ispsoftc *);
static int isp_sbus_intr(void *);
static int
isp_sbus_rd_isr(struct ispsoftc *, u_int16_t *, u_int16_t *, u_int16_t *);
static u_int16_t isp_sbus_rd_reg(struct ispsoftc *, int);
static void isp_sbus_wr_reg (struct ispsoftc *, int, u_int16_t);
static int isp_sbus_mbxdma(struct ispsoftc *);
static int isp_sbus_dmasetup(struct ispsoftc *, XS_T *, ispreq_t *, u_int16_t *,
u_int16_t);
static void isp_sbus_dmateardown(struct ispsoftc *, XS_T *, u_int16_t);
#ifndef ISP_1000_RISC_CODE
#define ISP_1000_RISC_CODE NULL
#endif
static struct ispmdvec mdvec = {
isp_sbus_rd_isr,
isp_sbus_rd_reg,
isp_sbus_wr_reg,
isp_sbus_mbxdma,
isp_sbus_dmasetup,
isp_sbus_dmateardown,
NULL,
isp_sbus_reset1,
NULL,
ISP_1000_RISC_CODE
};
struct isp_sbussoftc {
struct ispsoftc sbus_isp;
struct sbusdev sbus_sd;
sdparam sbus_dev;
bus_space_tag_t sbus_bustag;
bus_space_handle_t sbus_reg;
int sbus_node;
int sbus_pri;
struct ispmdvec sbus_mdvec;
bus_dmamap_t *sbus_dmamap;
int16_t sbus_poff[_NREG_BLKS];
};
static int isp_match(struct device *, struct cfdata *, void *);
static void isp_sbus_attach(struct device *, struct device *, void *);
CFATTACH_DECL(isp_sbus, sizeof (struct isp_sbussoftc),
isp_match, isp_sbus_attach, NULL, NULL);
static int
isp_match(struct device *parent, struct cfdata *cf, void *aux)
{
int rv;
#ifdef DEBUG
static int oneshot = 1;
#endif
struct sbus_attach_args *sa = aux;
rv = (strcmp(cf->cf_name, sa->sa_name) == 0 ||
strcmp("PTI,ptisp", sa->sa_name) == 0 ||
strcmp("ptisp", sa->sa_name) == 0 ||
strcmp("SUNW,isp", sa->sa_name) == 0 ||
strcmp("QLGC,isp", sa->sa_name) == 0);
#ifdef DEBUG
if (rv && oneshot) {
oneshot = 0;
printf("Qlogic ISP Driver, NetBSD (sbus) Platform Version "
"%d.%d Core Version %d.%d\n",
ISP_PLATFORM_VERSION_MAJOR, ISP_PLATFORM_VERSION_MINOR,
ISP_CORE_VERSION_MAJOR, ISP_CORE_VERSION_MINOR);
}
#endif
return (rv);
}
static void
isp_sbus_attach(struct device *parent, struct device *self, void *aux)
{
int freq, ispburst, sbusburst;
struct sbus_attach_args *sa = aux;
struct isp_sbussoftc *sbc = (struct isp_sbussoftc *) self;
struct ispsoftc *isp = &sbc->sbus_isp;
printf(" for %s\n", sa->sa_name);
sbc->sbus_bustag = sa->sa_bustag;
if (sa->sa_nintr != 0)
sbc->sbus_pri = sa->sa_pri;
sbc->sbus_mdvec = mdvec;
if (sa->sa_npromvaddrs) {
sbus_promaddr_to_handle(sa->sa_bustag,
sa->sa_promvaddrs[0], &sbc->sbus_reg);
} else {
if (sbus_bus_map(sa->sa_bustag, sa->sa_slot, sa->sa_offset,
sa->sa_size, 0, &sbc->sbus_reg) != 0) {
printf("%s: cannot map registers\n", self->dv_xname);
return;
}
}
sbc->sbus_node = sa->sa_node;
freq = PROM_getpropint(sa->sa_node, "clock-frequency", 0);
if (freq) {
/*
* Convert from HZ to MHz, rounding up.
*/
freq = (freq + 500000)/1000000;
#if 0
printf("%s: %d MHz\n", self->dv_xname, freq);
#endif
}
sbc->sbus_mdvec.dv_clock = freq;
/*
* Now figure out what the proper burst sizes, etc., to use.
* Unfortunately, there is no ddi_dma_burstsizes here which
* walks up the tree finding the limiting burst size node (if
* any).
*/
sbusburst = ((struct sbus_softc *)parent)->sc_burst;
if (sbusburst == 0)
sbusburst = SBUS_BURST_32 - 1;
ispburst = PROM_getpropint(sa->sa_node, "burst-sizes", -1);
if (ispburst == -1) {
ispburst = sbusburst;
}
ispburst &= sbusburst;
ispburst &= ~(1 << 7);
ispburst &= ~(1 << 6);
sbc->sbus_mdvec.dv_conf1 = 0;
if (ispburst & (1 << 5)) {
sbc->sbus_mdvec.dv_conf1 = BIU_SBUS_CONF1_FIFO_32;
} else if (ispburst & (1 << 4)) {
sbc->sbus_mdvec.dv_conf1 = BIU_SBUS_CONF1_FIFO_16;
} else if (ispburst & (1 << 3)) {
sbc->sbus_mdvec.dv_conf1 =
BIU_SBUS_CONF1_BURST8 | BIU_SBUS_CONF1_FIFO_8;
}
if (sbc->sbus_mdvec.dv_conf1) {
sbc->sbus_mdvec.dv_conf1 |= BIU_BURST_ENABLE;
}
/*
* Some early versions of the PTI SBus adapter
* would fail in trying to download (via poking)
* FW. We give up on them.
*/
if (strcmp("PTI,ptisp", sa->sa_name) == 0 ||
strcmp("ptisp", sa->sa_name) == 0) {
sbc->sbus_mdvec.dv_ispfw = NULL;
}
isp->isp_mdvec = &sbc->sbus_mdvec;
isp->isp_bustype = ISP_BT_SBUS;
isp->isp_type = ISP_HA_SCSI_UNKNOWN;
isp->isp_param = &sbc->sbus_dev;
isp->isp_dmatag = sa->sa_dmatag;
MEMZERO(isp->isp_param, sizeof (sdparam));
sbc->sbus_poff[BIU_BLOCK >> _BLK_REG_SHFT] = BIU_REGS_OFF;
sbc->sbus_poff[MBOX_BLOCK >> _BLK_REG_SHFT] = SBUS_MBOX_REGS_OFF;
sbc->sbus_poff[SXP_BLOCK >> _BLK_REG_SHFT] = SBUS_SXP_REGS_OFF;
sbc->sbus_poff[RISC_BLOCK >> _BLK_REG_SHFT] = SBUS_RISC_REGS_OFF;
sbc->sbus_poff[DMA_BLOCK >> _BLK_REG_SHFT] = DMA_REGS_OFF;
/* Establish interrupt channel */
bus_intr_establish(sbc->sbus_bustag, sbc->sbus_pri, IPL_BIO,
isp_sbus_intr, sbc);
sbus_establish(&sbc->sbus_sd, &sbc->sbus_isp.isp_osinfo._dev);
/*
* Set up logging levels.
*/
#ifdef ISP_LOGDEFAULT
isp->isp_dblev = ISP_LOGDEFAULT;
#else
isp->isp_dblev = ISP_LOGWARN|ISP_LOGERR;
if (bootverbose)
isp->isp_dblev |= ISP_LOGCONFIG|ISP_LOGINFO;
#ifdef SCSIDEBUG
isp->isp_dblev |= ISP_LOGDEBUG1|ISP_LOGDEBUG2;
#endif
#ifdef DEBUG
isp->isp_dblev |= ISP_LOGDEBUG0;
#endif
#endif
isp->isp_confopts = self->dv_cfdata->cf_flags;
isp->isp_role = ISP_DEFAULT_ROLES;
/*
* There's no tool on sparc to set NVRAM for ISPs, so ignore it.
*/
isp->isp_confopts |= ISP_CFG_NONVRAM;
ISP_LOCK(isp);
isp->isp_osinfo.no_mbox_ints = 1;
isp_reset(isp);
if (isp->isp_state != ISP_RESETSTATE) {
ISP_UNLOCK(isp);
return;
}
ENABLE_INTS(isp);
isp_init(isp);
if (isp->isp_state != ISP_INITSTATE) {
isp_uninit(isp);
ISP_UNLOCK(isp);
return;
}
/*
* do generic attach.
*/
ISP_UNLOCK(isp);
isp_attach(isp);
if (isp->isp_state != ISP_RUNSTATE) {
ISP_LOCK(isp);
isp_uninit(isp);
ISP_UNLOCK(isp);
}
}
static void
isp_sbus_reset1(struct ispsoftc *isp)
{
if (isp->isp_osinfo.no_mbox_ints == 0) {
ENABLE_INTS(isp);
}
}
static int
isp_sbus_intr(void *arg)
{
u_int16_t isr, sema, mbox;
struct ispsoftc *isp = arg;
if (ISP_READ_ISR(isp, &isr, &sema, &mbox) == 0) {
isp->isp_intbogus++;
return (0);
} else {
struct isp_sbussoftc *sbc = arg;
sbc->sbus_isp.isp_osinfo.onintstack = 1;
isp_intr(isp, isr, sema, mbox);
sbc->sbus_isp.isp_osinfo.onintstack = 0;
return (1);
}
}
#define IspVirt2Off(a, x) \
(((struct isp_sbussoftc *)a)->sbus_poff[((x) & _BLK_REG_MASK) >> \
_BLK_REG_SHFT] + ((x) & 0xff))
#define BXR2(sbc, off) \
bus_space_read_2(sbc->sbus_bustag, sbc->sbus_reg, off)
static int
isp_sbus_rd_isr(struct ispsoftc *isp, u_int16_t *isrp,
u_int16_t *semap, u_int16_t *mbp)
{
struct isp_sbussoftc *sbc = (struct isp_sbussoftc *) isp;
u_int16_t isr, sema;
isr = BXR2(sbc, IspVirt2Off(isp, BIU_ISR));
sema = BXR2(sbc, IspVirt2Off(isp, BIU_SEMA));
isp_prt(isp, ISP_LOGDEBUG3, "ISR 0x%x SEMA 0x%x", isr, sema);
isr &= INT_PENDING_MASK(isp);
sema &= BIU_SEMA_LOCK;
if (isr == 0 && sema == 0) {
return (0);
}
*isrp = isr;
if ((*semap = sema) != 0) {
*mbp = BXR2(sbc, IspVirt2Off(isp, OUTMAILBOX0));
}
return (1);
}
static u_int16_t
isp_sbus_rd_reg(struct ispsoftc *isp, int regoff)
{
struct isp_sbussoftc *sbc = (struct isp_sbussoftc *) isp;
int offset = sbc->sbus_poff[(regoff & _BLK_REG_MASK) >> _BLK_REG_SHFT];
offset += (regoff & 0xff);
return (bus_space_read_2(sbc->sbus_bustag, sbc->sbus_reg, offset));
}
static void
isp_sbus_wr_reg(struct ispsoftc *isp, int regoff, u_int16_t val)
{
struct isp_sbussoftc *sbc = (struct isp_sbussoftc *) isp;
int offset = sbc->sbus_poff[(regoff & _BLK_REG_MASK) >> _BLK_REG_SHFT];
offset += (regoff & 0xff);
bus_space_write_2(sbc->sbus_bustag, sbc->sbus_reg, offset, val);
}
static int
isp_sbus_mbxdma(struct ispsoftc *isp)
{
struct isp_sbussoftc *sbc = (struct isp_sbussoftc *) isp;
bus_dma_segment_t reqseg, rspseg;
int reqrs, rsprs, i, progress;
size_t n;
bus_size_t len;
if (isp->isp_rquest_dma)
return (0);
n = isp->isp_maxcmds * sizeof (XS_T *);
isp->isp_xflist = (XS_T **) malloc(n, M_DEVBUF, M_WAITOK);
if (isp->isp_xflist == NULL) {
isp_prt(isp, ISP_LOGERR, "cannot alloc xflist array");
return (1);
}
MEMZERO(isp->isp_xflist, n);
n = sizeof (bus_dmamap_t) * isp->isp_maxcmds;
sbc->sbus_dmamap = (bus_dmamap_t *) malloc(n, M_DEVBUF, M_WAITOK);
if (sbc->sbus_dmamap == NULL) {
free(isp->isp_xflist, M_DEVBUF);
isp->isp_xflist = NULL;
isp_prt(isp, ISP_LOGERR, "cannot alloc dmamap array");
return (1);
}
for (i = 0; i < isp->isp_maxcmds; i++) {
/* Allocate a DMA handle */
if (bus_dmamap_create(isp->isp_dmatag, MAXPHYS, 1, MAXPHYS, 0,
BUS_DMA_NOWAIT, &sbc->sbus_dmamap[i]) != 0) {
isp_prt(isp, ISP_LOGERR, "cmd DMA maps create error");
break;
}
}
if (i < isp->isp_maxcmds) {
while (--i >= 0) {
bus_dmamap_destroy(isp->isp_dmatag,
sbc->sbus_dmamap[i]);
}
free(isp->isp_xflist, M_DEVBUF);
free(sbc->sbus_dmamap, M_DEVBUF);
isp->isp_xflist = NULL;
sbc->sbus_dmamap = NULL;
return (1);
}
/*
* Allocate and map the request and response queues
*/
progress = 0;
len = ISP_QUEUE_SIZE(RQUEST_QUEUE_LEN(isp));
if (bus_dmamem_alloc(isp->isp_dmatag, len, 0, 0, &reqseg, 1, &reqrs,
BUS_DMA_NOWAIT)) {
goto dmafail;
}
progress++;
if (bus_dmamem_map(isp->isp_dmatag, &reqseg, reqrs, len,
(caddr_t *)&isp->isp_rquest, BUS_DMA_NOWAIT|BUS_DMA_COHERENT)) {
goto dmafail;
}
progress++;
if (bus_dmamap_create(isp->isp_dmatag, len, 1, len, 0, BUS_DMA_NOWAIT,
&isp->isp_rqdmap) != 0) {
goto dmafail;
}
progress++;
if (bus_dmamap_load(isp->isp_dmatag, isp->isp_rqdmap,
isp->isp_rquest, len, NULL, BUS_DMA_NOWAIT) != 0) {
goto dmafail;
}
progress++;
isp->isp_rquest_dma = isp->isp_rqdmap->dm_segs[0].ds_addr;
len = ISP_QUEUE_SIZE(RESULT_QUEUE_LEN(isp));
if (bus_dmamem_alloc(isp->isp_dmatag, len, 0, 0, &rspseg, 1, &rsprs,
BUS_DMA_NOWAIT)) {
goto dmafail;
}
progress++;
if (bus_dmamem_map(isp->isp_dmatag, &rspseg, rsprs, len,
(caddr_t *)&isp->isp_result, BUS_DMA_NOWAIT|BUS_DMA_COHERENT)) {
goto dmafail;
}
progress++;
if (bus_dmamap_create(isp->isp_dmatag, len, 1, len, 0, BUS_DMA_NOWAIT,
&isp->isp_rsdmap) != 0) {
goto dmafail;
}
progress++;
if (bus_dmamap_load(isp->isp_dmatag, isp->isp_rsdmap,
isp->isp_result, len, NULL, BUS_DMA_NOWAIT) != 0) {
goto dmafail;
}
isp->isp_result_dma = isp->isp_rsdmap->dm_segs[0].ds_addr;
return (0);
dmafail:
isp_prt(isp, ISP_LOGERR, "Mailbox DMA Setup Failure");
if (progress >= 8) {
bus_dmamap_unload(isp->isp_dmatag, isp->isp_rsdmap);
}
if (progress >= 7) {
bus_dmamap_destroy(isp->isp_dmatag, isp->isp_rsdmap);
}
if (progress >= 6) {
bus_dmamem_unmap(isp->isp_dmatag,
isp->isp_result, ISP_QUEUE_SIZE(RESULT_QUEUE_LEN(isp)));
}
if (progress >= 5) {
bus_dmamem_free(isp->isp_dmatag, &rspseg, rsprs);
}
if (progress >= 4) {
bus_dmamap_unload(isp->isp_dmatag, isp->isp_rqdmap);
}
if (progress >= 3) {
bus_dmamap_destroy(isp->isp_dmatag, isp->isp_rqdmap);
}
if (progress >= 2) {
bus_dmamem_unmap(isp->isp_dmatag,
isp->isp_rquest, ISP_QUEUE_SIZE(RQUEST_QUEUE_LEN(isp)));
}
if (progress >= 1) {
bus_dmamem_free(isp->isp_dmatag, &reqseg, reqrs);
}
for (i = 0; i < isp->isp_maxcmds; i++) {
bus_dmamap_destroy(isp->isp_dmatag, sbc->sbus_dmamap[i]);
}
free(sbc->sbus_dmamap, M_DEVBUF);
free(isp->isp_xflist, M_DEVBUF);
isp->isp_xflist = NULL;
sbc->sbus_dmamap = NULL;
return (1);
}
/*
* Map a DMA request.
* We're guaranteed that rq->req_handle is a value from 1 to isp->isp_maxcmds.
*/
static int
isp_sbus_dmasetup(struct ispsoftc *isp, XS_T *xs, ispreq_t *rq,
u_int16_t *nxtip, u_int16_t optr)
{
struct isp_sbussoftc *sbc = (struct isp_sbussoftc *) isp;
bus_dmamap_t dmap;
ispreq_t *qep;
int error, cansleep = (xs->xs_control & XS_CTL_NOSLEEP) == 0;
int in = (xs->xs_control & XS_CTL_DATA_IN) != 0;
qep = (ispreq_t *) ISP_QUEUE_ENTRY(isp->isp_rquest, isp->isp_reqidx);
if (xs->datalen == 0) {
rq->req_seg_count = 1;
goto mbxsync;
}
dmap = sbc->sbus_dmamap[isp_handle_index(rq->req_handle)];
if (dmap->dm_nsegs != 0) {
panic("%s: DMA map already allocated", isp->isp_name);
/* NOTREACHED */
}
error = bus_dmamap_load(isp->isp_dmatag, dmap, xs->data, xs->datalen,
NULL, (cansleep ? BUS_DMA_WAITOK : BUS_DMA_NOWAIT) |
BUS_DMA_STREAMING);
if (error != 0) {
XS_SETERR(xs, HBA_BOTCH);
if (error == EAGAIN || error == ENOMEM)
return (CMD_EAGAIN);
else
return (CMD_COMPLETE);
}
bus_dmamap_sync(isp->isp_dmatag, dmap, 0, xs->datalen,
in? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
if (in) {
rq->req_flags |= REQFLAG_DATA_IN;
} else {
rq->req_flags |= REQFLAG_DATA_OUT;
}
if (XS_CDBLEN(xs) > 12) {
u_int16_t onxti;
ispcontreq_t local, *crq = &local, *cqe;
onxti = *nxtip;
cqe = (ispcontreq_t *) ISP_QUEUE_ENTRY(isp->isp_rquest, onxti);
*nxtip = ISP_NXT_QENTRY(onxti, RQUEST_QUEUE_LEN(isp));
if (*nxtip == optr) {
isp_prt(isp, ISP_LOGDEBUG0, "Request Queue Overflow++");
bus_dmamap_unload(isp->isp_dmatag, dmap);
XS_SETERR(xs, HBA_BOTCH);
return (CMD_EAGAIN);
}
rq->req_seg_count = 2;
MEMZERO((void *)crq, sizeof (*crq));
crq->req_header.rqs_entry_count = 1;
crq->req_header.rqs_entry_type = RQSTYPE_DATASEG;
crq->req_dataseg[0].ds_count = xs->datalen;
crq->req_dataseg[0].ds_base = dmap->dm_segs[0].ds_addr;
isp_put_cont_req(isp, crq, cqe);
MEMORYBARRIER(isp, SYNC_REQUEST, onxti, QENTRY_LEN);
} else {
rq->req_seg_count = 1;
rq->req_dataseg[0].ds_count = xs->datalen;
rq->req_dataseg[0].ds_base = dmap->dm_segs[0].ds_addr;
}
mbxsync:
if (XS_CDBLEN(xs) > 12) {
isp_put_extended_request(isp,
(ispextreq_t *)rq, (ispextreq_t *) qep);
} else {
isp_put_request(isp, rq, qep);
}
return (CMD_QUEUED);
}
static void
isp_sbus_dmateardown(struct ispsoftc *isp, XS_T *xs, u_int16_t handle)
{
struct isp_sbussoftc *sbc = (struct isp_sbussoftc *) isp;
bus_dmamap_t dmap;
dmap = sbc->sbus_dmamap[isp_handle_index(handle)];
if (dmap->dm_nsegs == 0) {
panic("%s: DMA map not already allocated", isp->isp_name);
/* NOTREACHED */
}
bus_dmamap_sync(isp->isp_dmatag, dmap, 0,
xs->datalen, (xs->xs_control & XS_CTL_DATA_IN)?
BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(isp->isp_dmatag, dmap);
}
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