Import of NetBSD ATA/IDE stuff.

Introduction of home-grown

To enable this stuff in your configuration, look at the NEWATA conf file
and go through

dev/isa/files.isa
dev/pci/files.pci
conf/files
arch/i386/conf/files.i386

and follow the instructions on commenting/uncommenting stuff

1 files changed, 994 insertions, 0 deletions

diff --git a/sys/dev/atapiscsi/atapiscsi.c b/sys/dev/atapiscsi/atapiscsi.c
new file mode 100644
index 00000000000..01aefe60750
--- /dev/null
+++ b/sys/dev/atapiscsi/atapiscsi.c
@@ -0,0 +1,994 @@
+/*      $OpenBSD: atapiscsi.c,v 1.1 1999/07/18 21:25:18 csapuntz Exp $     */
+
+/*
+ * This code is derived from code with the copyright below.
+ */
+
+/*
+ * Copyright (c) 1996, 1998 Manuel Bouyer.
+ *
+ * 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 Manuel Bouyer.
+ * 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.
+ *
+ */
+
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/device.h>
+#include <sys/buf.h>
+#include <sys/dkstat.h>
+#include <sys/disklabel.h>
+#include <sys/dkstat.h>
+#include <sys/malloc.h>
+#include <sys/proc.h>
+#include <sys/reboot.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <scsi/scsi_all.h>
+#include <scsi/scsi_disk.h>
+#include <scsi/scsiconf.h>
+
+#include <vm/vm.h>
+
+#include <machine/bus.h>
+#include <machine/cpu.h>
+#include <machine/intr.h>
+
+#ifndef __BUS_SPACE_HAS_STREAM_METHODS
+#define    bus_space_write_multi_stream_2    bus_space_write_multi_2
+#define    bus_space_write_multi_stream_4    bus_space_write_multi_4
+#define    bus_space_read_multi_stream_2    bus_space_read_multi_2
+#define    bus_space_read_multi_stream_4    bus_space_read_multi_4
+#endif /* __BUS_SPACE_HAS_STREAM_METHODS */
+
+#include <dev/ata/atareg.h>
+#include <dev/ata/atavar.h>
+#include <dev/ic/wdcreg.h>
+#include <dev/ic/wdcvar.h>
+
+#include <dev/atapiscsi/atapiconf.h>
+
+#define WDCDEBUG
+#define DEBUG_INTR   0x01
+#define DEBUG_XFERS  0x02
+#define DEBUG_STATUS 0x04
+#define DEBUG_FUNCS  0x08
+#define DEBUG_PROBE  0x10
+#ifdef WDCDEBUG
+int wdcdebug_atapi_mask = 0xFF;
+#define WDCDEBUG_PRINT(args, level) \
+	if (wdcdebug_atapi_mask & (level)) \
+		printf args
+#else
+#define WDCDEBUG_PRINT(args, level)
+#endif
+
+#define ATAPI_DELAY 10	/* 10 ms, this is used only before sending a cmd */
+
+void  wdc_atapi_minphys  __P((struct buf *bp));
+void  wdc_atapi_start	__P((struct channel_softc *,struct wdc_xfer *));
+int   wdc_atapi_intr	 __P((struct channel_softc *, struct wdc_xfer *, int));
+int   wdc_atapi_ctrl	 __P((struct channel_softc *, struct wdc_xfer *, int));
+void  wdc_atapi_done	 __P((struct channel_softc *, struct wdc_xfer *));
+void  wdc_atapi_reset	 __P((struct channel_softc *, struct wdc_xfer *));
+int   wdc_atapi_send_cmd __P((struct scsi_xfer *sc_xfer));
+
+#define MAX_SIZE MAXPHYS
+
+struct atapiscsi_softc;
+struct atapiscsi_xfer;
+
+static int atapiscsi_match __P((struct device *, void *, void *));
+static void atapiscsi_attach __P((struct device *, struct device *, void *));
+
+int	wdc_atapi_get_params __P((struct atapiscsi_softc *, u_int8_t, int,
+	    struct ataparams *)); 
+
+#define XS_SHORTSENSE XS_SENSE
+#define XS_RESET XS_DRIVER_STUFFUP
+#define ATAPI_TO_SCSI_SENSE(sc, atapi_error) \
+   (sc)->error_code = XS_SHORTSENSE; (sc)->flags = (atapi_error) >> 4; 
+
+struct atapiscsi_softc {
+	struct device  sc_dev;
+	struct  scsi_link  sc_adapterlink;
+	struct  wdc_softc  *sc_wdc;
+
+	u_int8_t sc_channel;  /* Channel we represent */
+	struct   scsi_link  sc_link[2];
+	int  valid[2];
+	struct ata_drive_datas *sc_drvs;	/* array supplied by adapter */
+};
+
+static struct scsi_adapter atapiscsi_switch = 
+{
+	wdc_atapi_send_cmd,
+	wdc_atapi_minphys,
+	NULL,
+	NULL,
+};
+
+static struct scsi_device atapiscsi_dev = 
+{
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+};
+
+/* Inital version shares bus_link structure so it can easily
+   be "attached to current" wdc driver */
+
+struct cfattach atapiscsi_ca = {
+	sizeof(struct atapiscsi_softc), atapiscsi_match, atapiscsi_attach
+};
+
+struct cfdriver atapiscsi_cd = {
+	NULL, "atapiscsi", DV_DULL
+};
+
+
+int atapiscsi_match(parent, match, aux)
+	struct device *parent;
+	void *match, *aux;
+
+{
+	struct ata_atapi_attach *aa_link = aux;
+	struct cfdata *cf = match;
+
+	if (aa_link == NULL)
+		return (0);
+	if (aa_link->aa_type != T_ATAPI)
+		return (0);
+
+	if (cf->cf_loc[0] != aa_link->aa_channel &&
+	    cf->cf_loc[0] != -1)
+		return (0);
+
+	return (1);
+}
+
+void
+atapiscsi_attach(parent, self, aux)
+	struct device *parent, *self;
+	void *aux;
+
+{
+	struct atapiscsi_softc *as = (struct atapiscsi_softc *)self;
+	struct ata_atapi_attach *aa_link = aux;
+	struct ataparams ids;
+	struct ataparams *id = &ids;
+	int drive;
+
+	/* Ouch */
+	as->valid[0] = as->valid[1] = 0;
+
+	as->sc_wdc = (struct wdc_softc *)parent;
+	as->sc_drvs = aa_link->aa_drv_data;
+	as->sc_channel = aa_link->aa_channel;
+	as->sc_adapterlink.adapter_softc = as;
+	as->sc_adapterlink.adapter_target = 7;
+	as->sc_adapterlink.adapter = &atapiscsi_switch;
+	as->sc_adapterlink.device = &atapiscsi_dev;
+	as->sc_adapterlink.openings = 1;
+	as->sc_wdc->channels[as->sc_channel]->ch_as = as;
+
+	for (drive = 0; drive < 2 ; drive++ ) {
+		if (wdc_atapi_get_params(as, drive,
+		    SCSI_POLL|SCSI_NOSLEEP, id) == COMPLETE) {
+			struct ata_drive_datas *drvp = &as->sc_drvs[drive];
+
+			as->valid[drive] = 1;
+
+			/* This is wrong. All the devices on the ATAPI bus
+			   will be called atapibus by the IDE side of the
+			   driver. */
+			drvp->drv_softc = (struct device *)as;
+			wdc_probe_caps(drvp);		
+		}
+	}
+
+#if 0
+	config_found(self, &as->sc_adapterlink, scsiprint);
+#endif
+}
+
+
+void
+wdc_atapibus_final_attach(chp)
+	struct channel_softc *chp;
+{
+	if (chp->ch_as)
+		config_found((struct device *)chp->ch_as, 
+			     &chp->ch_as->sc_adapterlink, scsiprint);
+}
+
+void
+wdc_atapibus_attach(chp)
+	struct channel_softc *chp;
+{
+	struct wdc_softc *wdc = chp->wdc;
+	int channel = chp->channel;
+	struct ata_atapi_attach aa_link;
+
+	/*
+	 * Fill in the adapter.
+	 */
+	memset(&aa_link, 0, sizeof(struct ata_atapi_attach));
+	aa_link.aa_type = T_ATAPI;
+	aa_link.aa_channel = channel;
+	aa_link.aa_openings = 1;
+	aa_link.aa_drv_data = chp->ch_drive; /* pass the whole array */
+#if 0
+	aa_link.aa_bus_private = &wdc->sc_atapi_adapter;
+#endif
+	(void)config_found(&wdc->sc_dev, (void *)&aa_link, atapi_print);
+}
+
+void
+wdc_atapi_minphys (struct buf *bp)
+{
+	if(bp->b_bcount > MAX_SIZE)
+		bp->b_bcount = MAX_SIZE;
+	minphys(bp);
+}
+
+
+/*
+ *  The scsi_cmd interface works as follows:
+ *
+ */
+
+int
+wdc_atapi_get_params(as, drive, flags, id)
+	struct atapiscsi_softc *as;
+	u_int8_t drive;
+	int flags;
+	struct ataparams *id;
+{
+	struct wdc_softc *wdc = as->sc_wdc;
+	struct channel_softc *chp =
+	    wdc->channels[as->sc_channel];
+	struct wdc_command wdc_c;
+
+	/* if no ATAPI device detected at wdc attach time, skip */
+	/*
+	 * XXX this will break scsireprobe if this is of any interest for
+	 * ATAPI devices one day.
+	 */
+	if ((chp->ch_drive[drive].drive_flags & DRIVE_ATAPI) == 0) {
+		WDCDEBUG_PRINT(("wdc_atapi_get_params: drive %d not present\n",
+		    drive), DEBUG_PROBE);
+		return -1;
+	}
+	memset(&wdc_c, 0, sizeof(struct wdc_command));
+	wdc_c.r_command = ATAPI_SOFT_RESET;
+	wdc_c.r_st_bmask = 0;
+	wdc_c.r_st_pmask = 0;
+	wdc_c.flags = AT_POLL;
+	wdc_c.timeout = WDC_RESET_WAIT;
+	if (wdc_exec_command(&chp->ch_drive[drive], &wdc_c) != WDC_COMPLETE) {
+		printf("wdc_atapi_get_params: ATAPI_SOFT_RESET failed for"
+		    " drive %s:%d:%d: driver failed\n",
+		    chp->wdc->sc_dev.dv_xname, chp->channel, drive);
+		panic("wdc_atapi_get_params");
+	}
+	if (wdc_c.flags & (AT_ERROR | AT_TIMEOU | AT_DF)) {
+		WDCDEBUG_PRINT(("wdc_atapi_get_params: ATAPI_SOFT_RESET "
+		    "failed for drive %s:%d:%d: error 0x%x\n",
+		    chp->wdc->sc_dev.dv_xname, chp->channel, drive, 
+		    wdc_c.r_error), DEBUG_PROBE);
+		return -1;
+	}
+	chp->ch_drive[drive].state = 0;
+
+	bus_space_read_1(chp->cmd_iot, chp->cmd_ioh, wd_status);
+	
+	/* Some ATAPI devices need a bit more time after software reset. */
+	delay(5000);
+	if (ata_get_params(&chp->ch_drive[drive], AT_POLL, id) != 0) {
+		WDCDEBUG_PRINT(("wdc_atapi_get_params: ATAPI_IDENTIFY_DEVICE "
+		    "failed for drive %s:%d:%d: error 0x%x\n",
+		    chp->wdc->sc_dev.dv_xname, chp->channel, drive, 
+		    wdc_c.r_error), DEBUG_PROBE);
+		return -1;
+	}
+	return COMPLETE;
+}
+
+int
+wdc_atapi_send_cmd(sc_xfer)
+	struct scsi_xfer *sc_xfer;
+{
+	struct atapiscsi_softc *as = sc_xfer->sc_link->adapter_softc;
+	struct wdc_softc *wdc = as->sc_wdc;
+	struct wdc_xfer *xfer;
+	int flags = sc_xfer->flags;
+	int channel = as->sc_channel;
+	int drive = sc_xfer->sc_link->target;
+	int s, ret;
+
+	WDCDEBUG_PRINT(("wdc_atapi_send_cmd %s:%d:%d\n",
+	    wdc->sc_dev.dv_xname, channel, drive), DEBUG_XFERS);
+
+	if (drive > 1 || !as->valid[drive]) {
+		sc_xfer->error = XS_DRIVER_STUFFUP;
+		return COMPLETE;
+	}
+
+	xfer = wdc_get_xfer(flags & SCSI_NOSLEEP ? WDC_NOSLEEP : WDC_CANSLEEP);
+	if (xfer == NULL) {
+		return TRY_AGAIN_LATER;
+	}
+	if (sc_xfer->flags & SCSI_POLL)
+		xfer->c_flags |= C_POLL;
+	xfer->drive = drive;
+	xfer->c_flags |= C_ATAPI;
+	xfer->cmd = sc_xfer;
+	xfer->databuf = sc_xfer->data;
+	xfer->c_bcount = sc_xfer->datalen;
+	xfer->c_start = wdc_atapi_start;
+	xfer->c_intr = wdc_atapi_intr;
+	s = splbio();
+	wdc_exec_xfer(wdc->channels[channel], xfer);
+#ifdef DIAGNOSTIC
+	if ((sc_xfer->flags & SCSI_POLL) != 0 &&
+	    (sc_xfer->flags & ITSDONE) == 0)
+		panic("wdc_atapi_send_cmd: polled command not done");
+#endif
+	ret = (sc_xfer->flags & ITSDONE) ? COMPLETE : SUCCESSFULLY_QUEUED;
+	splx(s);
+	return ret;
+}
+
+void
+wdc_atapi_start(chp, xfer)
+	struct channel_softc *chp;
+	struct wdc_xfer *xfer;
+{
+	struct scsi_xfer *sc_xfer = xfer->cmd;
+	struct ata_drive_datas *drvp = &chp->ch_drive[xfer->drive];
+
+	WDCDEBUG_PRINT(("wdc_atapi_start %s:%d:%d, scsi flags 0x%x \n",
+	    chp->wdc->sc_dev.dv_xname, chp->channel, drvp->drive,
+	    sc_xfer->flags), DEBUG_XFERS);
+	/* Adjust C_DMA, it may have changed if we are requesting sense */
+	if ((drvp->drive_flags & (DRIVE_DMA | DRIVE_UDMA)) &&
+	    (sc_xfer->datalen > 0 || (xfer->c_flags & C_SENSE)))
+		xfer->c_flags |= C_DMA;
+	else
+		xfer->c_flags &= ~C_DMA;
+	/* Do control operations specially. */
+	if (drvp->state < READY) {
+		if (drvp->state != PIOMODE) {
+			printf("%s:%d:%d: bad state %d in wdc_atapi_start\n",
+			    chp->wdc->sc_dev.dv_xname, chp->channel,
+			    xfer->drive, drvp->state);
+			panic("wdc_atapi_start: bad state");
+		}
+		wdc_atapi_ctrl(chp, xfer, 0);
+		return;
+	}
+	bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_sdh,
+	    WDSD_IBM | (xfer->drive << 4));
+	if (wait_for_unbusy(chp, ATAPI_DELAY) < 0) {
+		printf("wdc_atapi_start: not ready, st = %02x\n",
+		    chp->ch_status);
+		sc_xfer->error = XS_TIMEOUT;
+		wdc_atapi_reset(chp, xfer);
+		return;
+	}
+
+	/*
+	 * Even with WDCS_ERR, the device should accept a command packet
+	 * Limit length to what can be stuffed into the cylinder register
+	 * (16 bits).  Some CD-ROMs seem to interpret '0' as 65536,
+	 * but not all devices do that and it's not obvious from the
+	 * ATAPI spec that that behaviour should be expected.  If more
+	 * data is necessary, multiple data transfer phases will be done.
+	 */
+
+	wdccommand(chp, xfer->drive, ATAPI_PKT_CMD, 
+	    sc_xfer->datalen <= 0xffff ? sc_xfer->datalen : 0xffff,
+	    0, 0, 0, 
+	    (xfer->c_flags & C_DMA) ? ATAPI_PKT_CMD_FTRE_DMA : 0);
+	
+	/*
+	 * If there is no interrupt for CMD input, busy-wait for it (done in 
+	 * the interrupt routine. If it is a polled command, call the interrupt
+	 * routine until command is done.
+	 */
+	if (
+#ifndef __OpenBSD__
+	    (sc_xfer->sc_link->scsi_atapi.cap  & ATAPI_CFG_DRQ_MASK) !=
+	    ATAPI_CFG_IRQ_DRQ || (sc_xfer->flags & SCSI_POLL)
+#else
+	    1
+#endif
+	) {
+		/* Wait for at last 400ns for status bit to be valid */
+		DELAY(1);
+		wdc_atapi_intr(chp, xfer, 0);
+	} else {
+		chp->ch_flags |= WDCF_IRQ_WAIT;
+		timeout(wdctimeout, chp, hz);
+	}
+
+	if (sc_xfer->flags & SCSI_POLL) {
+		while ((sc_xfer->flags & ITSDONE) == 0) {
+			/* Wait for at last 400ns for status bit to be valid */
+			DELAY(1);
+			wdc_atapi_intr(chp, xfer, 0);
+		}
+	}
+}
+
+int
+wdc_atapi_intr(chp, xfer, irq)
+	struct channel_softc *chp;
+	struct wdc_xfer *xfer;
+	int irq;
+{
+	struct scsi_xfer *sc_xfer = xfer->cmd;
+	struct ata_drive_datas *drvp = &chp->ch_drive[xfer->drive];
+	int len, phase, i, retries=0;
+	int ire, dma_err = 0;
+	int dma_flags = 0;
+	struct scsi_generic _cmd_reqsense;
+	struct scsi_sense *cmd_reqsense =
+	    (struct scsi_sense *)&_cmd_reqsense;
+	u_int32_t cmd[4];
+	int  cmdlen =12;  /* XXX - Not true for all ATAPI devices */
+
+	memset (cmd, 0, sizeof(cmd));
+
+	WDCDEBUG_PRINT(("wdc_atapi_intr %s:%d:%d\n",
+	    chp->wdc->sc_dev.dv_xname, chp->channel, drvp->drive), DEBUG_INTR);
+
+	/* Is it not a transfer, but a control operation? */
+	if (drvp->state < READY) {
+		printf("%s:%d:%d: bad state %d in wdc_atapi_intr\n",
+		    chp->wdc->sc_dev.dv_xname, chp->channel, xfer->drive,
+		    drvp->state);
+		panic("wdc_atapi_intr: bad state\n");
+	}
+	/* Ack interrupt done in wait_for_unbusy */
+	bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_sdh,
+	    WDSD_IBM | (xfer->drive << 4));
+	if (wait_for_unbusy(chp,
+	    (irq == 0) ? sc_xfer->timeout : 0) != 0) {
+		if (irq && (xfer->c_flags & C_TIMEOU) == 0)
+			return 0; /* IRQ was not for us */
+		printf("%s:%d:%d: device timeout, c_bcount=%d, c_skip=%d\n",
+		    chp->wdc->sc_dev.dv_xname, chp->channel, xfer->drive,
+		    xfer->c_bcount, xfer->c_skip);
+		if (xfer->c_flags & C_DMA)
+			drvp->n_dmaerrs++;
+		sc_xfer->error = XS_TIMEOUT;
+		wdc_atapi_reset(chp, xfer);
+		return 1;
+	}
+	/* If we missed an IRQ and were using DMA, flag it as a DMA error */
+	if ((xfer->c_flags & C_TIMEOU) && (xfer->c_flags & C_DMA))
+		drvp->n_dmaerrs++;
+	/* 
+	 * if the request sense command was aborted, report the short sense
+	 * previously recorded, else continue normal processing
+	 */
+
+	if ((xfer->c_flags & C_SENSE) != 0 &&
+	    (chp->ch_status & WDCS_ERR) != 0 &&
+	    (chp->ch_error & WDCE_ABRT) != 0) {
+		WDCDEBUG_PRINT(("wdc_atapi_intr: request_sense aborted, "
+		    "calling wdc_atapi_done()"
+		    ), DEBUG_INTR);
+		wdc_atapi_done(chp, xfer);
+		return 1;
+	}
+
+	if (xfer->c_flags & C_DMA) {
+		dma_flags = ((sc_xfer->flags & SCSI_DATA_IN) ||
+		    (xfer->c_flags & C_SENSE)) ?  WDC_DMA_READ : 0;
+		dma_flags |= sc_xfer->flags & SCSI_POLL ? WDC_DMA_POLL : 0;
+	}
+again:
+	len = bus_space_read_1(chp->cmd_iot, chp->cmd_ioh, wd_cyl_lo) +
+	    256 * bus_space_read_1(chp->cmd_iot, chp->cmd_ioh, wd_cyl_hi);
+	ire = bus_space_read_1(chp->cmd_iot, chp->cmd_ioh, wd_ireason);
+	phase = (ire & (WDCI_CMD | WDCI_IN)) | (chp->ch_status & WDCS_DRQ);
+	WDCDEBUG_PRINT(("wdc_atapi_intr: c_bcount %d len %d st 0x%x err 0x%x "
+	    "ire 0x%x :", xfer->c_bcount,
+	    len, chp->ch_status, chp->ch_error, ire), DEBUG_INTR);
+
+	switch (phase) {
+	case PHASE_CMDOUT:
+		if (xfer->c_flags & C_SENSE) {
+			memset(cmd_reqsense, 0, sizeof(struct scsi_generic));
+			cmd_reqsense->opcode = REQUEST_SENSE;
+			cmd_reqsense->length = xfer->c_bcount;
+			bcopy(cmd_reqsense, cmd, sizeof(struct scsi_generic));
+		} else {
+			bcopy(sc_xfer->cmd, cmd, sc_xfer->cmdlen);
+		}
+		WDCDEBUG_PRINT(("PHASE_CMDOUT\n"), DEBUG_INTR);
+		/* Init the DMA channel if necessary */
+		if (xfer->c_flags & C_DMA) {
+			if ((*chp->wdc->dma_init)(chp->wdc->dma_arg,
+			    chp->channel, xfer->drive,
+			    xfer->databuf, xfer->c_bcount, dma_flags) != 0) {
+				sc_xfer->error = XS_DRIVER_STUFFUP;
+				break;
+			}
+		}
+		/* send packet command */
+		/* Commands are 12 or 16 bytes long. It's 32-bit aligned */
+		if ((chp->wdc->cap & WDC_CAPABILITY_ATAPI_NOSTREAM)) {
+			if (drvp->drive_flags & DRIVE_CAP32) {
+				bus_space_write_multi_4(chp->data32iot,
+				    chp->data32ioh, 0,
+				    (u_int32_t *)cmd,
+				    cmdlen >> 2);
+			} else {
+				bus_space_write_multi_2(chp->cmd_iot,
+				    chp->cmd_ioh, wd_data,
+				    (u_int16_t *)cmd,
+				    cmdlen >> 1);
+			}
+		} else {
+			if (drvp->drive_flags & DRIVE_CAP32) {
+				bus_space_write_multi_stream_4(chp->data32iot,
+				    chp->data32ioh, 0,
+				    (u_int32_t *)cmd,
+				    cmdlen >> 2);
+			} else {
+				bus_space_write_multi_stream_2(chp->cmd_iot,
+				    chp->cmd_ioh, wd_data,
+				    (u_int16_t *)cmd,
+				    cmdlen >> 1);
+			}
+		}
+		/* Start the DMA channel if necessary */
+		if (xfer->c_flags & C_DMA) {
+			(*chp->wdc->dma_start)(chp->wdc->dma_arg,
+			    chp->channel, xfer->drive, dma_flags);
+		}
+
+		if ((sc_xfer->flags & SCSI_POLL) == 0) {
+			chp->ch_flags |= WDCF_IRQ_WAIT;
+			timeout(wdctimeout, chp, sc_xfer->timeout * hz / 1000);
+		}
+		return 1;
+
+	 case PHASE_DATAOUT:
+		/* write data */
+		WDCDEBUG_PRINT(("PHASE_DATAOUT\n"), DEBUG_INTR);
+		if ((sc_xfer->flags & SCSI_DATA_OUT) == 0 ||
+		    (xfer->c_flags & C_DMA) != 0) {
+			printf("wdc_atapi_intr: bad data phase DATAOUT\n");
+			if (xfer->c_flags & C_DMA) {
+				(*chp->wdc->dma_finish)(chp->wdc->dma_arg,
+				    chp->channel, xfer->drive, dma_flags);
+				drvp->n_dmaerrs++;
+			}
+			sc_xfer->error = XS_TIMEOUT;
+			wdc_atapi_reset(chp, xfer);
+			return 1;
+		}
+		if (xfer->c_bcount < len) {
+			printf("wdc_atapi_intr: warning: write only "
+			    "%d of %d requested bytes\n", xfer->c_bcount, len);
+			if ((chp->wdc->cap & WDC_CAPABILITY_ATAPI_NOSTREAM)) {
+				bus_space_write_multi_2(chp->cmd_iot,
+				    chp->cmd_ioh, wd_data,
+				    (u_int16_t *)((char *)xfer->databuf +
+				                  xfer->c_skip),
+				    xfer->c_bcount >> 1);
+			} else {
+				bus_space_write_multi_stream_2(chp->cmd_iot,
+				    chp->cmd_ioh, wd_data,
+				    (u_int16_t *)((char *)xfer->databuf +
+				                  xfer->c_skip),
+				    xfer->c_bcount >> 1);
+			}
+			for (i = xfer->c_bcount; i < len; i += 2)
+				bus_space_write_2(chp->cmd_iot, chp->cmd_ioh,
+				    wd_data, 0);
+			xfer->c_skip += xfer->c_bcount;
+			xfer->c_bcount = 0;
+		} else {
+			if (drvp->drive_flags & DRIVE_CAP32) {
+			    if ((chp->wdc->cap & WDC_CAPABILITY_ATAPI_NOSTREAM))
+				bus_space_write_multi_4(chp->data32iot,
+				    chp->data32ioh, 0,
+				    (u_int32_t *)((char *)xfer->databuf +
+				                  xfer->c_skip),
+				    len >> 2);
+			    else
+				bus_space_write_multi_stream_4(chp->data32iot,
+				    chp->data32ioh, wd_data,
+				    (u_int32_t *)((char *)xfer->databuf +
+				                  xfer->c_skip),
+				    len >> 2);
+
+			    xfer->c_skip += len & 0xfffffffc;
+			    xfer->c_bcount -= len & 0xfffffffc;
+			    len = len & 0x03;
+			}
+			if (len > 0) {
+			    if ((chp->wdc->cap & WDC_CAPABILITY_ATAPI_NOSTREAM))
+				bus_space_write_multi_2(chp->cmd_iot,
+				    chp->cmd_ioh, wd_data,
+				    (u_int16_t *)((char *)xfer->databuf +
+				                  xfer->c_skip),
+				    len >> 1);
+			    else
+				bus_space_write_multi_stream_2(chp->cmd_iot,
+				    chp->cmd_ioh, wd_data,
+				    (u_int16_t *)((char *)xfer->databuf +
+				                  xfer->c_skip),
+				    len >> 1);
+			    xfer->c_skip += len;
+			    xfer->c_bcount -= len;
+			}
+		}
+		if ((sc_xfer->flags & SCSI_POLL) == 0) {
+			chp->ch_flags |= WDCF_IRQ_WAIT;
+			timeout(wdctimeout, chp, sc_xfer->timeout * hz / 1000);
+		}
+		return 1;
+
+	case PHASE_DATAIN:
+		/* Read data */
+		WDCDEBUG_PRINT(("PHASE_DATAIN\n"), DEBUG_INTR);
+		if (((sc_xfer->flags & SCSI_DATA_IN) == 0 &&
+		    (xfer->c_flags & C_SENSE) == 0) || 
+		    (xfer->c_flags & C_DMA) != 0) {
+			printf("wdc_atapi_intr: bad data phase DATAIN\n");
+			if (xfer->c_flags & C_DMA) {
+				(*chp->wdc->dma_finish)(chp->wdc->dma_arg,
+				    chp->channel, xfer->drive, dma_flags);
+				drvp->n_dmaerrs++;
+			}
+			sc_xfer->error = XS_TIMEOUT;
+			wdc_atapi_reset(chp, xfer);
+			return 1;
+		}
+		if (xfer->c_bcount < len) {
+			printf("wdc_atapi_intr: warning: reading only "
+			    "%d of %d bytes\n", xfer->c_bcount, len);
+			if ((chp->wdc->cap & WDC_CAPABILITY_ATAPI_NOSTREAM)) {
+			    bus_space_read_multi_2(chp->cmd_iot,
+			    chp->cmd_ioh, wd_data,
+			    (u_int16_t *)((char *)xfer->databuf +
+			                  xfer->c_skip),
+			    xfer->c_bcount >> 1);
+			} else {
+			    bus_space_read_multi_stream_2(chp->cmd_iot,
+			    chp->cmd_ioh, wd_data,
+			    (u_int16_t *)((char *)xfer->databuf +
+			                  xfer->c_skip),
+			    xfer->c_bcount >> 1);
+			}
+			wdcbit_bucket(chp, len - xfer->c_bcount);
+			xfer->c_skip += xfer->c_bcount;
+			xfer->c_bcount = 0;
+		} else {
+			if (drvp->drive_flags & DRIVE_CAP32) {
+			    if ((chp->wdc->cap & WDC_CAPABILITY_ATAPI_NOSTREAM))
+				bus_space_read_multi_4(chp->data32iot,
+				    chp->data32ioh, 0,
+				    (u_int32_t *)((char *)xfer->databuf +
+				                  xfer->c_skip),
+				    len >> 2);
+			    else
+				bus_space_read_multi_stream_4(chp->data32iot,
+				    chp->data32ioh, wd_data,
+				    (u_int32_t *)((char *)xfer->databuf +
+				                  xfer->c_skip),
+				    len >> 2);
+				
+			    xfer->c_skip += len & 0xfffffffc;
+			    xfer->c_bcount -= len & 0xfffffffc;
+			    len = len & 0x03;
+			}
+			if (len > 0) {
+			    if ((chp->wdc->cap & WDC_CAPABILITY_ATAPI_NOSTREAM))
+				bus_space_read_multi_2(chp->cmd_iot,
+				    chp->cmd_ioh, wd_data,
+				    (u_int16_t *)((char *)xfer->databuf +
+				                  xfer->c_skip), 
+				    len >> 1);
+			    else
+				bus_space_read_multi_stream_2(chp->cmd_iot,
+				    chp->cmd_ioh, wd_data,
+				    (u_int16_t *)((char *)xfer->databuf +
+				                  xfer->c_skip), 
+				    len >> 1);
+			    xfer->c_skip += len;
+			    xfer->c_bcount -=len;
+			}
+		}
+		if ((sc_xfer->flags & SCSI_POLL) == 0) {
+			chp->ch_flags |= WDCF_IRQ_WAIT;
+			timeout(wdctimeout, chp, sc_xfer->timeout * hz / 1000);
+		}
+		return 1;
+
+	case PHASE_ABORTED:
+	case PHASE_COMPLETED:
+		WDCDEBUG_PRINT(("PHASE_COMPLETED\n"), DEBUG_INTR);
+		/* turn off DMA channel */
+		if (xfer->c_flags & C_DMA) {
+			dma_err = (*chp->wdc->dma_finish)(chp->wdc->dma_arg,
+			    chp->channel, xfer->drive, dma_flags);
+			if (xfer->c_flags & C_SENSE)
+				xfer->c_bcount -=
+				    sizeof(sc_xfer->sense);
+			else
+				xfer->c_bcount -= sc_xfer->datalen;
+		}
+		if (xfer->c_flags & C_SENSE) {
+			if ((chp->ch_status & WDCS_ERR) || dma_err < 0) {
+				/*
+				 * request sense failed ! it's not suppossed
+				 * to be possible
+				 */
+				if (dma_err < 0)
+					drvp->n_dmaerrs++;
+				sc_xfer->error = XS_RESET;
+				wdc_atapi_reset(chp, xfer);
+				return (1);
+			} else if (xfer->c_bcount <
+			    sizeof(sc_xfer->sense)) {
+				/* use the sense we just read */
+				sc_xfer->error = XS_SENSE;
+			} else {
+				/*
+				 * command completed, but no data was read.
+				 * use the short sense we saved previsouly.
+				 */
+				sc_xfer->error = XS_SHORTSENSE;
+			}
+		} else {
+			sc_xfer->resid = xfer->c_bcount;
+			if (chp->ch_status & WDCS_ERR) {
+				/* save the short sense */
+				sc_xfer->error = XS_SHORTSENSE;
+				ATAPI_TO_SCSI_SENSE(&sc_xfer->sense, chp->ch_error);
+				if ((sc_xfer->sc_link->quirks &
+				    SDEV_NOSENSE) == 0) {
+					/*
+					 * let the driver issue a
+					 * 'request sense'
+					 */
+					xfer->databuf = &sc_xfer->sense;
+					xfer->c_bcount =
+					    sizeof(sc_xfer->sense);
+					xfer->c_skip = 0;
+					xfer->c_flags |= C_SENSE;
+					wdc_atapi_start(chp, xfer);
+					return 1;
+				}
+			} else if (dma_err < 0) {
+				drvp->n_dmaerrs++;
+				sc_xfer->error = XS_RESET;
+				wdc_atapi_reset(chp, xfer);
+				return (1);
+			}
+		}
+		if (xfer->c_bcount != 0) {
+			WDCDEBUG_PRINT(("wdc_atapi_intr: bcount value is "
+			    "%d after io\n", xfer->c_bcount), DEBUG_XFERS);
+		}
+#ifdef DIAGNOSTIC
+		if (xfer->c_bcount < 0) {
+			printf("wdc_atapi_intr warning: bcount value "
+			    "is %d after io\n", xfer->c_bcount);
+		}
+#endif
+		break;
+
+	default:
+		if (++retries<500) {
+			DELAY(100);
+			chp->ch_status = bus_space_read_1(chp->cmd_iot,
+			    chp->cmd_ioh, wd_status);
+			chp->ch_error = bus_space_read_1(chp->cmd_iot,
+			    chp->cmd_ioh, wd_error);
+			goto again;
+		}
+		printf("wdc_atapi_intr: unknown phase 0x%x\n", phase);
+		if (chp->ch_status & WDCS_ERR) {
+			sc_xfer->error = XS_SHORTSENSE;
+			ATAPI_TO_SCSI_SENSE(&sc_xfer->sense, chp->ch_error);
+		} else {
+			sc_xfer->error = XS_RESET;
+			wdc_atapi_reset(chp, xfer);
+			return (1);
+		}
+	}
+	WDCDEBUG_PRINT(("wdc_atapi_intr: wdc_atapi_done() (end), error 0x%x "
+	    "\n", sc_xfer->error),
+	    DEBUG_INTR);
+	wdc_atapi_done(chp, xfer);
+	return (1);
+}
+
+int
+wdc_atapi_ctrl(chp, xfer, irq)
+	struct channel_softc *chp;
+	struct wdc_xfer *xfer;
+	int irq;
+{
+	struct scsi_xfer *sc_xfer = xfer->cmd;
+	struct ata_drive_datas *drvp = &chp->ch_drive[xfer->drive];
+	char *errstring = NULL;
+	int delay = (irq == 0) ? ATAPI_DELAY : 0;
+
+	/* Ack interrupt done in wait_for_unbusy */
+again:
+	WDCDEBUG_PRINT(("wdc_atapi_ctrl %s:%d:%d state %d\n",
+	    chp->wdc->sc_dev.dv_xname, chp->channel, drvp->drive, drvp->state),
+	    DEBUG_INTR | DEBUG_FUNCS);
+	bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_sdh,
+	    WDSD_IBM | (xfer->drive << 4));
+	switch (drvp->state) {
+	case PIOMODE:
+piomode:
+		/* Don't try to set mode if controller can't be adjusted */
+		if ((chp->wdc->cap & WDC_CAPABILITY_MODE) == 0)
+			goto ready;
+		/* Also don't try if the drive didn't report its mode */
+		if ((drvp->drive_flags & DRIVE_MODE) == 0)
+			goto ready;;
+		wdccommand(chp, drvp->drive, SET_FEATURES, 0, 0, 0,
+		    0x08 | drvp->PIO_mode, WDSF_SET_MODE);
+		drvp->state = PIOMODE_WAIT;
+		break;
+	case PIOMODE_WAIT:
+		errstring = "piomode";
+		if (wait_for_unbusy(chp, delay))
+			goto timeout;
+		if (chp->ch_status & WDCS_ERR) {
+			if (drvp->PIO_mode < 3) {
+				drvp->PIO_mode = 3;
+				goto piomode;
+			} else {
+				goto error;
+			}
+		}
+	/* fall through */
+
+	case DMAMODE:
+		if (drvp->drive_flags & DRIVE_UDMA) {
+			wdccommand(chp, drvp->drive, SET_FEATURES, 0, 0, 0,
+			    0x40 | drvp->UDMA_mode, WDSF_SET_MODE);
+		} else if (drvp->drive_flags & DRIVE_DMA) {
+			wdccommand(chp, drvp->drive, SET_FEATURES, 0, 0, 0,
+			    0x20 | drvp->DMA_mode, WDSF_SET_MODE);
+		} else {
+			goto ready;
+		}
+		drvp->state = DMAMODE_WAIT;
+		break;
+	case DMAMODE_WAIT:
+		errstring = "dmamode";
+		if (wait_for_unbusy(chp, delay))
+			goto timeout;
+		if (chp->ch_status & WDCS_ERR)
+			goto error;
+	/* fall through */
+
+	case READY:
+	ready:
+		drvp->state = READY;
+		xfer->c_intr = wdc_atapi_intr;
+		wdc_atapi_start(chp, xfer);
+		return 1;
+	}
+	if ((sc_xfer->flags & SCSI_POLL) == 0) {
+		chp->ch_flags |= WDCF_IRQ_WAIT;
+		xfer->c_intr = wdc_atapi_ctrl;
+		timeout(wdctimeout, chp, sc_xfer->timeout * hz / 1000);
+	} else {
+		goto again;
+	}
+	return 1;
+
+timeout:
+	if (irq && (xfer->c_flags & C_TIMEOU) == 0) {
+		return 0; /* IRQ was not for us */
+	}
+	printf("%s:%d:%d: %s timed out\n",
+	    chp->wdc->sc_dev.dv_xname, chp->channel, xfer->drive, errstring);
+	sc_xfer->error = XS_TIMEOUT;
+	wdc_atapi_reset(chp, xfer);
+	return 1;
+error:
+	printf("%s:%d:%d: %s ",
+	    chp->wdc->sc_dev.dv_xname, chp->channel, xfer->drive,
+	    errstring);
+	printf("error (0x%x)\n", chp->ch_error);
+	sc_xfer->error = XS_SHORTSENSE;
+	ATAPI_TO_SCSI_SENSE(&sc_xfer->sense, chp->ch_error);
+	wdc_atapi_reset(chp, xfer);
+	return 1;
+}
+
+void
+wdc_atapi_done(chp, xfer)
+	struct channel_softc *chp;
+	struct wdc_xfer *xfer;
+{
+	struct scsi_xfer *sc_xfer = xfer->cmd;
+	int need_done =  xfer->c_flags & C_NEEDDONE;
+	struct ata_drive_datas *drvp = &chp->ch_drive[xfer->drive];
+
+	WDCDEBUG_PRINT(("wdc_atapi_done %s:%d:%d: flags 0x%x\n",
+	    chp->wdc->sc_dev.dv_xname, chp->channel, xfer->drive,
+	    (u_int)xfer->c_flags), DEBUG_XFERS);
+	/* remove this command from xfer queue */
+	wdc_free_xfer(chp, xfer);
+	sc_xfer->flags |= ITSDONE;
+	if (drvp->n_dmaerrs ||
+	  (sc_xfer->error != XS_NOERROR && sc_xfer->error != XS_SENSE &&
+	  sc_xfer->error != XS_SHORTSENSE)) {
+		drvp->n_dmaerrs = 0;
+		wdc_downgrade_mode(drvp);
+	}
+	    
+	if (need_done) {
+		WDCDEBUG_PRINT(("wdc_atapi_done: scsi_done\n"), DEBUG_XFERS);
+		scsi_done(sc_xfer);
+	}
+	WDCDEBUG_PRINT(("wdcstart from wdc_atapi_done, flags 0x%x\n",
+	    chp->ch_flags), DEBUG_XFERS);
+	wdcstart(chp);
+}
+
+void
+wdc_atapi_reset(chp, xfer)
+	struct channel_softc *chp;
+	struct wdc_xfer *xfer;
+{
+	struct ata_drive_datas *drvp = &chp->ch_drive[xfer->drive];
+	struct scsi_xfer *sc_xfer = xfer->cmd;
+
+	wdccommandshort(chp, xfer->drive, ATAPI_SOFT_RESET);
+	drvp->state = 0;
+	if (wait_for_unbusy(chp, WDC_RESET_WAIT) != 0) {
+		printf("%s:%d:%d: reset failed\n",
+		    chp->wdc->sc_dev.dv_xname, chp->channel,
+		    xfer->drive);
+		sc_xfer->error = XS_SELTIMEOUT;
+	}
+	wdc_atapi_done(chp, xfer);
+	return;
+}
+