/*	$OpenBSD: umass_scsi.c,v 1.6 2004/01/14 02:00:41 krw Exp $ */
/*	$NetBSD: umass_scsipi.c,v 1.9 2003/02/16 23:14:08 augustss Exp $	*/
/*
 * Copyright (c) 2001 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Lennart Augustsson (lennart@augustsson.net) at
 * Carlstedt Research & Technology.
 *
 * 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 the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 "atapiscsi.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/buf.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>

#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdi_util.h>
#include <dev/usb/usbdevs.h>

#include <dev/usb/umassvar.h>
#include <dev/usb/umass_scsi.h>

#include <scsi/scsi_all.h>
#include <scsi/scsiconf.h>
#include <scsi/scsi_disk.h>
#include <machine/bus.h>

struct umass_scsi_softc {
	struct umassbus_softc	base;
	struct scsi_link	sc_link;
	struct scsi_adapter	sc_adapter;

	usbd_status		sc_sync_status;
	struct scsi_sense	sc_sense_cmd;
};


#define SHORT_INQUIRY_LENGTH    36 /* XXX */

#define UMASS_SCSIID_HOST	0x00
#define UMASS_SCSIID_DEVICE	0x01

#define UMASS_ATAPI_DRIVE	0

int umass_scsi_cmd(struct scsi_xfer *);
void umass_scsi_minphys(struct buf *);

void umass_scsi_cb(struct umass_softc *sc, void *priv, int residue,
		   int status);
void umass_scsi_sense_cb(struct umass_softc *sc, void *priv, int residue,
			 int status);
struct umass_scsi_softc *umass_scsi_setup(struct umass_softc *);

struct scsi_device umass_scsi_dev = { NULL, NULL, NULL, NULL, };

#if NATAPISCSI > 0
struct scsi_device umass_atapiscsi_dev = { NULL, NULL, NULL, NULL, };
#endif

int
umass_scsi_attach(struct umass_softc *sc)
{
	struct umass_scsi_softc *scbus;

	scbus = umass_scsi_setup(sc);
	scbus->sc_link.adapter_target = UMASS_SCSIID_HOST;
	scbus->sc_link.luns = sc->maxlun + 1;
	scbus->sc_link.flags &= ~SDEV_ATAPI;
	scbus->sc_link.device = &umass_scsi_dev;

	DPRINTF(UDMASS_USB, ("%s: umass_attach_bus: SCSI\n"
			     "sc = 0x%x, scbus = 0x%x\n",
			     USBDEVNAME(sc->sc_dev), sc, scbus));

	sc->sc_refcnt++;
	scbus->base.sc_child =
	  config_found((struct device *)sc, &scbus->sc_link, scsiprint);
	if (--sc->sc_refcnt < 0)
		usb_detach_wakeup(USBDEV(sc->sc_dev));

	return (0);
}

#if NATAPISCSI > 0
int
umass_atapi_attach(struct umass_softc *sc)
{
	struct umass_scsi_softc *scbus;

	scbus = umass_scsi_setup(sc);
	scbus->sc_link.adapter_target = UMASS_SCSIID_HOST;
	scbus->sc_link.luns = 1;
	scbus->sc_link.openings = 1;
	scbus->sc_link.flags |= SDEV_ATAPI;
	scbus->sc_link.device = &umass_atapiscsi_dev;

	DPRINTF(UDMASS_USB, ("%s: umass_attach_bus: ATAPI\n"
			     "sc = 0x%x, scbus = 0x%x\n",
			     USBDEVNAME(sc->sc_dev), sc, scbus));

	sc->sc_refcnt++;
	scbus->base.sc_child =
	  config_found((struct device *)sc, &scbus->sc_link, scsiprint);
	if (--sc->sc_refcnt < 0)
		usb_detach_wakeup(USBDEV(sc->sc_dev));

	return (0);
}
#endif

struct umass_scsi_softc *
umass_scsi_setup(struct umass_softc *sc)
{
	struct umass_scsi_softc *scbus;

	scbus = malloc(sizeof(struct umass_scsi_softc), M_DEVBUF, M_WAITOK);
	memset(&scbus->sc_link, 0, sizeof(struct scsi_link));
	memset(&scbus->sc_adapter, 0, sizeof(struct scsi_adapter));

	sc->bus = (struct umassbus_softc *)scbus;

	/* Fill in the adapter. */
	scbus->sc_adapter.scsi_cmd = umass_scsi_cmd;
	scbus->sc_adapter.scsi_minphys = umass_scsi_minphys;

	/* Fill in the link. */
	scbus->sc_link.adapter_buswidth = 2;
	scbus->sc_link.adapter = &scbus->sc_adapter;
	scbus->sc_link.adapter_softc = sc;
	scbus->sc_link.openings = 1;
	scbus->sc_link.quirks |= PQUIRK_ONLYBIG | PQUIRK_NOMODESENSE |
		sc->sc_busquirks;

	return (scbus);
}

int
umass_scsi_cmd(struct scsi_xfer *xs)
{
	struct scsi_link *sc_link = xs->sc_link;
	struct umass_softc *sc = sc_link->adapter_softc;
	struct umass_scsi_softc *scbus = (struct umass_scsi_softc *)sc->bus;

	struct scsi_generic *cmd, trcmd;
	int cmdlen, dir, s;

#ifdef UMASS_DEBUG
	microtime(&sc->tv);
#endif

	memset(&trcmd, 0, sizeof(trcmd));

	DIF(UDMASS_UPPER, sc_link->flags |= SCSIDEBUG_LEVEL);

	DPRINTF(UDMASS_CMD, ("%s: umass_scsi_cmd: at %lu.%06lu: %d:%d "
		"xs=%p cmd=0x%02x datalen=%d (quirks=0x%x, poll=%d)\n",
		USBDEVNAME(sc->sc_dev), sc->tv.tv_sec, sc->tv.tv_usec,
		sc_link->target, sc_link->lun, xs, xs->cmd->opcode,
		xs->datalen, sc_link->quirks, xs->flags & SCSI_POLL));

#if defined(USB_DEBUG) && defined(SCSIDEBUG)
	if (umassdebug & UDMASS_SCSI)
		show_scsi_xs(xs);
	else if (umassdebug & ~UDMASS_CMD)
		show_scsi_cmd(xs);
#endif

	if (sc->sc_dying) {
		xs->error = XS_DRIVER_STUFFUP;
		goto done;
	}

#if defined(UMASS_DEBUG)
	if (sc_link->target != UMASS_SCSIID_DEVICE) {
		DPRINTF(UDMASS_SCSI, ("%s: wrong SCSI ID %d\n",
			USBDEVNAME(sc->sc_dev), sc_link->target));
		xs->error = XS_DRIVER_STUFFUP;
		goto done;
	}
#endif

	cmd = xs->cmd;
	cmdlen = xs->cmdlen;

	if (cmd->opcode == MODE_SENSE &&
	    (sc_link->quirks & SDEV_NOMODESENSE)) {
		xs->error = XS_TIMEOUT;
		goto done;
	}

	if (cmd->opcode == START_STOP &&
	    (sc->sc_quirks & UMASS_QUIRK_NO_START_STOP)) {
		xs->error = XS_NOERROR;
		goto done;
	}

	if (cmd->opcode == INQUIRY &&
	    (sc->sc_quirks & UMASS_QUIRK_FORCE_SHORT_INQUIRY)) {
			/*
			 * Some drives wedge when asked for full inquiry
			 * information.
			 */
		memcpy(&trcmd, cmd, sizeof(trcmd));
		trcmd.bytes[4] = SHORT_INQUIRY_LENGTH;
		cmd = &trcmd;
		xs->datalen = SHORT_INQUIRY_LENGTH;
	}

	dir = DIR_NONE;
	if (xs->datalen) {
		switch (xs->flags & (SCSI_DATA_IN | SCSI_DATA_OUT)) {
		case SCSI_DATA_IN:
			dir = DIR_IN;
			break;
		case SCSI_DATA_OUT:
			dir = DIR_OUT;
			break;
		}
	}

	if (xs->datalen > UMASS_MAX_TRANSFER_SIZE) {
		printf("umass_cmd: large datalen, %d\n", xs->datalen);
		xs->error = XS_DRIVER_STUFFUP;
		goto done;
	}

	if (xs->flags & SCSI_POLL) {
		/* Use sync transfer. XXX Broken! */
		DPRINTF(UDMASS_SCSI, ("umass_scsi_cmd: sync dir=%d\n", dir));
		sc->sc_xfer_flags = USBD_SYNCHRONOUS;
		scbus->sc_sync_status = USBD_INVAL;
		sc->sc_methods->wire_xfer(sc, sc_link->lun, cmd, cmdlen,
					  xs->data, xs->datalen, dir,
					  xs->timeout, 0, xs);
		sc->sc_xfer_flags = 0;
		DPRINTF(UDMASS_SCSI, ("umass_scsi_cmd: done err=%d\n",
				      scbus->sc_sync_status));
		switch (scbus->sc_sync_status) {
		case USBD_NORMAL_COMPLETION:
			xs->error = XS_NOERROR;
			break;
		case USBD_TIMEOUT:
			xs->error = XS_TIMEOUT;
			break;
		default:
			xs->error = XS_DRIVER_STUFFUP;
			break;
		}
		goto done;
	} else {
		DPRINTF(UDMASS_SCSI,
			("umass_scsi_cmd: async dir=%d, cmdlen=%d"
			 " datalen=%d\n",
			 dir, cmdlen, xs->datalen));
		sc->sc_methods->wire_xfer(sc, sc_link->lun, cmd, cmdlen,
					  xs->data, xs->datalen, dir,
					  xs->timeout, umass_scsi_cb, xs);
		return (SUCCESSFULLY_QUEUED);
	}

	/* Return if command finishes early. */
 done:
	xs->flags |= ITSDONE;
	
	s = splbio();
	scsi_done(xs);
	splx(s);
	if (xs->flags & SCSI_POLL)
		return (COMPLETE);
	else
		return (SUCCESSFULLY_QUEUED);
}

void
umass_scsi_minphys(struct buf *bp)
{
	if (bp->b_bcount > UMASS_MAX_TRANSFER_SIZE)
		bp->b_bcount = UMASS_MAX_TRANSFER_SIZE;

	minphys(bp);
}

void
umass_scsi_cb(struct umass_softc *sc, void *priv, int residue, int status)
{
	struct umass_scsi_softc *scbus = (struct umass_scsi_softc *)sc->bus;
	struct scsi_xfer *xs = priv;
	struct scsi_link *link = xs->sc_link;
	int cmdlen;
	int s;
#ifdef UMASS_DEBUG
	struct timeval tv;
	u_int delta;
	microtime(&tv);
	delta = (tv.tv_sec - sc->tv.tv_sec) * 1000000 +
		tv.tv_usec - sc->tv.tv_usec;
#endif

	DPRINTF(UDMASS_CMD,
		("umass_scsi_cb: at %lu.%06lu, delta=%u: xs=%p residue=%d"
		 " status=%d\n", tv.tv_sec, tv.tv_usec, delta, xs, residue,
		 status));

	xs->resid = residue;

	switch (status) {
	case STATUS_CMD_OK:
		xs->error = XS_NOERROR;
		break;

	case STATUS_CMD_UNKNOWN:
		DPRINTF(UDMASS_CMD, ("umass_scsi_cb: status cmd unknown\n"));
		/* we can't issue REQUEST SENSE */
		if (xs->sc_link->quirks & PQUIRK_NOSENSE) {
			/*
			 * If no residue and no other USB error,
			 * command succeeded.
			 */
			if (residue == 0) {
				xs->error = XS_NOERROR;
				break;
			}

			/*
			 * Some devices return a short INQUIRY
			 * response, omitting response data from the
			 * "vendor specific data" on...
			 */
			if (xs->cmd->opcode == INQUIRY &&
			    residue < xs->datalen) {
				xs->error = XS_NOERROR;
				break;
			}

			xs->error = XS_DRIVER_STUFFUP;
			break;
		}
		/* FALLTHROUGH */
	case STATUS_CMD_FAILED:
		DPRINTF(UDMASS_CMD, ("umass_scsi_cb: status cmd failed for "
		    "scsi op 0x%02x\n", xs->cmd->opcode));
		/* fetch sense data */
		memset(&scbus->sc_sense_cmd, 0, sizeof(scbus->sc_sense_cmd));
		scbus->sc_sense_cmd.opcode = REQUEST_SENSE;
		scbus->sc_sense_cmd.byte2 = link->lun << SCSI_CMD_LUN_SHIFT;
		scbus->sc_sense_cmd.length = sizeof(xs->sense);

		cmdlen = sizeof(scbus->sc_sense_cmd);
		if (sc->sc_cmd == UMASS_CPROTO_UFI) /* XXX */
			cmdlen = UFI_COMMAND_LENGTH;
		sc->sc_methods->wire_xfer(sc, link->lun,
					  &scbus->sc_sense_cmd, cmdlen,
					  &xs->sense, sizeof(xs->sense),
					  DIR_IN, xs->timeout,
					  umass_scsi_sense_cb, xs);
		return;

	case STATUS_WIRE_FAILED:
		xs->error = XS_RESET;
		break;

	default:
		panic("%s: Unknown status %d in umass_scsi_cb",
		      USBDEVNAME(sc->sc_dev), status);
	}

	xs->flags |= ITSDONE;

	DPRINTF(UDMASS_CMD,("umass_scsi_cb: at %lu.%06lu: return error=%d, "
			    "status=0x%x resid=%d\n",
			    tv.tv_sec, tv.tv_usec,
			    xs->error, xs->status, xs->resid));

	s = splbio();
	scsi_done(xs);
	splx(s);
}

/*
 * Finalise a completed autosense operation
 */
void
umass_scsi_sense_cb(struct umass_softc *sc, void *priv, int residue,
		    int status)
{
	struct scsi_xfer *xs = priv;
	int s;

	DPRINTF(UDMASS_CMD,("umass_scsi_sense_cb: xs=%p residue=%d "
		"status=%d\n", xs, residue, status));

	switch (status) {
	case STATUS_CMD_OK:
	case STATUS_CMD_UNKNOWN:
		/* getting sense data succeeded */
		if (xs->cmd->opcode == INQUIRY && (xs->resid < xs->datalen ||
		    (sc->sc_quirks & UMASS_QUIRK_RS_NO_CLEAR_UA /* XXX */))) {
			/*
			 * Some drivers return SENSE errors even after INQUIRY.
			 * The upper layer doesn't like that.
			 */
			xs->error = XS_NOERROR;
			break;
		}
		/* XXX look at residue */
		if (residue == 0 || residue == 14)/* XXX */
			xs->error = XS_SENSE;
		else
			xs->error = XS_SHORTSENSE;
		break;
	default:
		DPRINTF(UDMASS_SCSI, ("%s: Autosense failed, status %d\n",
			USBDEVNAME(sc->sc_dev), status));
		xs->error = XS_DRIVER_STUFFUP;
		break;
	}

	xs->flags |= ITSDONE;

	DPRINTF(UDMASS_CMD,("umass_scsi_sense_cb: return xs->error=%d, "
		"xs->flags=0x%x xs->resid=%d\n", xs->error, xs->status,
		xs->resid));

	s = splbio();
	scsi_done(xs);
	splx(s);
}