add sbus frontend for isp

2 files changed, 601 insertions, 1 deletions

diff --git a/sys/dev/sbus/files.sbus b/sys/dev/sbus/files.sbus
index 235071d330f..71839ace6a4 100644
--- a/sys/dev/sbus/files.sbus
+++ b/sys/dev/sbus/files.sbus
@@ -1,4 +1,4 @@
-#	$OpenBSD: files.sbus,v 1.6 2001/09/30 00:45:17 jason Exp $
+#	$OpenBSD: files.sbus,v 1.7 2001/10/06 02:03:24 jason Exp $
 #	$NetBSD: files.sbus,v 1.16 2000/12/08 17:29:12 martin Exp $
 #
 # Config file and device description for machine-independent SBUS code.
@@ -48,3 +48,6 @@ file	dev/sbus/if_hme_sbus.c		hme_sbus
 device	audiocs: audio, auconv
 attach	audiocs at sbus
 file	dev/sbus/cs4231.c		audiocs
+
+attach	isp at sbus with isp_sbus
+file	dev/sbus/isp_sbus.c		isp_sbus
diff --git a/sys/dev/sbus/isp_sbus.c b/sys/dev/sbus/isp_sbus.c
new file mode 100644
index 00000000000..ae987f268e8
--- /dev/null
+++ b/sys/dev/sbus/isp_sbus.c
@@ -0,0 +1,597 @@
+/*	$OpenBSD: isp_sbus.c,v 1.1 2001/10/06 02:03:24 jason Exp $	*/
+/* $NetBSD: isp_sbus.c,v 1.46 2001/09/26 20:53:14 eeh 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/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/queue.h>
+
+#include <machine/bus.h>
+#include <machine/intr.h>
+#include <machine/autoconf.h>
+
+#include <dev/ic/isp_openbsd.h>
+#if	defined(ISP_COMPILE_FW) || defined(ISP_COMPILE_1000_FW)
+#include <dev/microcode/isp/asm_sbus.h>
+#endif
+#include <dev/sbus/sbusvar.h>
+#include <sys/reboot.h>
+
+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,
+	NULL,
+	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_dma_tag_t	sbus_dmatag;
+	bus_space_handle_t sbus_reg;
+	int		sbus_node;
+	int		sbus_pri;
+	struct ispmdvec	sbus_mdvec;
+	bus_dmamap_t	*sbus_dmamap;
+	bus_dmamap_t	sbus_rquest_dmamap;
+	bus_dmamap_t	sbus_result_dmamap;
+	int16_t		sbus_poff[_NREG_BLKS];
+};
+
+
+static int isp_match(struct device *, void *, void *);
+static void isp_sbus_attach(struct device *, struct device *, void *);
+struct cfattach isp_sbus_ca = {
+	sizeof (struct isp_sbussoftc), isp_match, isp_sbus_attach
+};
+
+static int
+isp_match(struct device *parent, void *vcf, void *aux)
+{
+	struct cfdata *cf = vcf;
+	int rv;
+#ifdef DEBUG
+	static int oneshot = 1;
+#endif
+	struct sbus_attach_args *sa = aux;
+
+	rv = (strcmp(cf->cf_driver->cd_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;
+	sbc->sbus_dmatag = sa->sa_dmatag;
+	if (sa->sa_nintr != 0)
+		sbc->sbus_pri = sa->sa_pri;
+	sbc->sbus_mdvec = mdvec;
+
+	if (sa->sa_npromvaddrs != 0) {
+		sbc->sbus_reg = (bus_space_handle_t)sa->sa_promvaddrs[0];
+	} else {
+		if (sbus_bus_map(sa->sa_bustag, sa->sa_slot, sa->sa_offset,
+				 sa->sa_size, BUS_SPACE_MAP_LINEAR, 0,
+				 &sbc->sbus_reg) != 0) {
+			printf("%s: cannot map registers\n", self->dv_xname);
+			return;
+		}
+	}
+	sbc->sbus_node = sa->sa_node;
+
+	freq = 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 = 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;
+	bzero(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, 0,
+	    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;
+#ifdef	SCSIDEBUG
+	isp->isp_dblev |= ISP_LOGDEBUG1|ISP_LOGDEBUG2;
+#endif
+#ifdef	DEBUG
+	isp->isp_dblev |= ISP_LOGDEBUG0|ISP_LOGCONFIG|ISP_LOGINFO;
+#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 int
+isp_sbus_intr(void *arg)
+{
+	u_int16_t isr, sema, mbox;
+	struct ispsoftc *isp = arg;
+	struct isp_sbussoftc *sbc = arg;
+
+	bus_dmamap_sync(sbc->sbus_dmatag, sbc->sbus_result_dmamap, 0,
+	    sbc->sbus_result_dmamap->dm_mapsize, BUS_DMASYNC_POSTREAD);
+	if (ISP_READ_ISR(isp, &isr, &sema, &mbox)) {
+		sbc->sbus_isp.isp_osinfo.onintstack = 1;
+		isp_intr(isp, isr, sema, mbox);
+		sbc->sbus_isp.isp_osinfo.onintstack = 0;
+		return (1);
+	} else {
+		return (0);
+	}
+}
+
+#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_tag_t dmatag = sbc->sbus_dmatag;
+	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);
+	}
+	bzero(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(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(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(dmatag, len, 0, 0, &reqseg, 1, &reqrs,
+	    BUS_DMA_NOWAIT)) {
+		goto dmafail;
+	}
+	progress++;
+	if (bus_dmamem_map(dmatag, &reqseg, reqrs, len,
+	    (caddr_t *)&isp->isp_rquest, BUS_DMA_NOWAIT|BUS_DMA_COHERENT)) {
+		goto dmafail;
+	}
+	progress++;
+	if (bus_dmamap_create(dmatag, len, 1, len, 0, BUS_DMA_NOWAIT,
+	    &sbc->sbus_rquest_dmamap) != 0) {
+		goto dmafail;
+	}
+	progress++;
+	if (bus_dmamap_load(dmatag, sbc->sbus_rquest_dmamap,
+	    isp->isp_rquest, len, NULL, BUS_DMA_NOWAIT) != 0) {
+		goto dmafail;
+	}
+	progress++;
+	isp->isp_rquest_dma = sbc->sbus_rquest_dmamap->dm_segs[0].ds_addr;
+
+	len = ISP_QUEUE_SIZE(RESULT_QUEUE_LEN(isp));
+	if (bus_dmamem_alloc(dmatag, len, 0, 0, &rspseg, 1, &rsprs,
+	    BUS_DMA_NOWAIT)) {
+		goto dmafail;
+	}
+	progress++;
+	if (bus_dmamem_map(dmatag, &rspseg, rsprs, len,
+	    (caddr_t *)&isp->isp_result, BUS_DMA_NOWAIT|BUS_DMA_COHERENT)) {
+		goto dmafail;
+	}
+	progress++;
+	if (bus_dmamap_create(dmatag, len, 1, len, 0, BUS_DMA_NOWAIT,
+	    &sbc->sbus_result_dmamap) != 0) {
+		goto dmafail;
+	}
+	progress++;
+	if (bus_dmamap_load(dmatag, sbc->sbus_result_dmamap,
+	    isp->isp_result, len, NULL, BUS_DMA_NOWAIT) != 0) {
+		goto dmafail;
+	}
+	isp->isp_result_dma = sbc->sbus_result_dmamap->dm_segs[0].ds_addr;
+
+	return (0);
+
+dmafail:
+	isp_prt(isp, ISP_LOGERR, "Mailbox DMA Setup Failure");
+
+	if (progress >= 8) {
+		bus_dmamap_unload(dmatag, sbc->sbus_result_dmamap);
+	}
+	if (progress >= 7) {
+		bus_dmamap_destroy(dmatag, sbc->sbus_result_dmamap);
+	}
+	if (progress >= 6) {
+		bus_dmamem_unmap(dmatag,
+		    isp->isp_result, ISP_QUEUE_SIZE(RESULT_QUEUE_LEN(isp)));
+	}
+	if (progress >= 5) {
+		bus_dmamem_free(dmatag, &rspseg, rsprs);
+	}
+
+	if (progress >= 4) {
+		bus_dmamap_unload(dmatag, sbc->sbus_rquest_dmamap);
+	}
+	if (progress >= 3) {
+		bus_dmamap_destroy(dmatag, sbc->sbus_rquest_dmamap);
+	}
+	if (progress >= 2) {
+		bus_dmamem_unmap(dmatag,
+		    isp->isp_rquest, ISP_QUEUE_SIZE(RQUEST_QUEUE_LEN(isp)));
+	}
+	if (progress >= 1) {
+		bus_dmamem_free(dmatag, &reqseg, reqrs);
+	}
+
+	for (i = 0; i < isp->isp_maxcmds; i++) {
+		bus_dmamap_destroy(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 *iptrp, u_int16_t optr)
+{
+	struct isp_sbussoftc *sbc = (struct isp_sbussoftc *) isp;
+	bus_dmamap_t dmap;
+	ispcontreq_t *crq;
+	int cansleep = (xs->flags & SCSI_NOSLEEP) == 0;
+	int in = (xs->flags & SCSI_DATA_IN) != 0;
+
+	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\n", isp->isp_name);
+		/* NOTREACHED */
+	}
+	if (bus_dmamap_load(sbc->sbus_dmatag, dmap, xs->data, xs->datalen,
+	    NULL, (cansleep ? BUS_DMA_WAITOK : BUS_DMA_NOWAIT) |
+	    BUS_DMA_STREAMING) != 0) {
+		XS_SETERR(xs, HBA_BOTCH);
+		return (CMD_COMPLETE);
+	}
+
+	bus_dmamap_sync(sbc->sbus_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) {
+		crq = (ispcontreq_t *) ISP_QUEUE_ENTRY(isp->isp_rquest, *iptrp);
+		*iptrp = ISP_NXT_QENTRY(*iptrp, RQUEST_QUEUE_LEN(isp));
+		if (*iptrp == optr) {
+			isp_prt(isp, ISP_LOGDEBUG0, "Request Queue Overflow++");
+			bus_dmamap_unload(sbc->sbus_dmatag, dmap);
+			XS_SETERR(xs, HBA_BOTCH);
+			return (CMD_EAGAIN);
+		}
+		rq->req_seg_count = 2;
+		rq->req_dataseg[0].ds_count = 0;
+		rq->req_dataseg[0].ds_base =  0;
+		bzero((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_SBUSIFY_ISPHDR(isp, &crq->req_header)
+	} else {
+		rq->req_dataseg[0].ds_count = xs->datalen;
+		rq->req_dataseg[0].ds_base = dmap->dm_segs[0].ds_addr;
+		rq->req_seg_count = 1;
+	}
+
+mbxsync:
+	ISP_SWIZZLE_REQUEST(isp, rq);
+	bus_dmamap_sync(sbc->sbus_dmatag, sbc->sbus_rquest_dmamap, 0,
+	     sbc->sbus_rquest_dmamap->dm_mapsize, BUS_DMASYNC_PREWRITE);
+	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\n", isp->isp_name);
+		/* NOTREACHED */
+	}
+	bus_dmamap_sync(sbc->sbus_dmatag, dmap, 0,
+	    xs->datalen, (xs->flags & SCSI_DATA_IN)?
+	    BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
+	bus_dmamap_unload(sbc->sbus_dmatag, dmap);
+}