scsiconf.h

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

/*	$OpenBSD: scsiconf.h,v 1.31 2001/10/26 10:50:26 krw Exp $	*/
/*	$NetBSD: scsiconf.h,v 1.35 1997/04/02 02:29:38 mycroft Exp $	*/

/*
 * Copyright (c) 1993, 1994, 1995 Charles Hannum.  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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Charles Hannum.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 */

/*
 * Originally written by Julian Elischer ([e-mail])
 * for TRW Financial Systems for use under the MACH(2.5) operating system.
 *
 * TRW Financial Systems, in accordance with their agreement with Carnegie
 * Mellon University, makes this software available to CMU to distribute
 * or use in any manner that they see fit as long as this message is kept with
 * the software. For this reason TFS also grants any other persons or
 * organisations permission to use or modify this software.
 *
 * TFS supplies this software to be publicly redistributed
 * on the understanding that TFS is not responsible for the correct
 * functioning of this software in any circumstances.
 *
 * Ported to run under 386BSD by Julian Elischer ([e-mail]) Sept 1992
 */

#ifndef	SCSI_SCSICONF_H
#define SCSI_SCSICONF_H 1

typedef	int			boolean;

#include <sys/queue.h>
#include <machine/cpu.h>
#include <scsi/scsi_debug.h>

/*
 * The following documentation tries to describe the relationship between the
 * various structures defined in this file:
 *
 * each adapter type has a scsi_adapter struct. This describes the adapter and
 *    identifies routines that can be called to use the adapter.
 * each device type has a scsi_device struct. This describes the device and
 *    identifies routines that can be called to use the device.
 * each existing device position (scsibus + target + lun)
 *    can be described by a scsi_link struct.
 *    Only scsi positions that actually have devices, have a scsi_link
 *    structure assigned. so in effect each device has scsi_link struct.
 *    The scsi_link structure contains information identifying both the
 *    device driver and the adapter driver for that position on that scsi bus,
 *    and can be said to 'link' the two.
 * each individual scsi bus has an array that points to all the scsi_link
 *    structs associated with that scsi bus. Slots with no device have
 *    a NULL pointer.
 * each individual device also knows the address of it's own scsi_link
 *    structure.
 *
 *				-------------
 *
 * The key to all this is the scsi_link structure which associates all the
 * other structures with each other in the correct configuration.  The
 * scsi_link is the connecting information that allows each part of the
 * scsi system to find the associated other parts.
 */

struct buf;
struct scsi_xfer;
struct scsi_link;

/*
 * Temporary hack 
 */
extern int scsi_autoconf;

/*
 * These entrypoints are called by the high-end drivers to get services from
 * whatever low-end drivers they are attached to each adapter type has one of
 * these statically allocated.
 */
struct scsi_adapter {
	int		(*scsi_cmd) __P((struct scsi_xfer *));
	void		(*scsi_minphys) __P((struct buf *));
	int		(*open_target_lu) __P((void));
	int		(*close_target_lu) __P((void));
	int		(*ioctl) __P((struct scsi_link *, u_long cmd,
			    caddr_t addrp, int flag));
};

/*
 * return values for scsi_cmd()
 */
#define SUCCESSFULLY_QUEUED	0
#define TRY_AGAIN_LATER		1
#define	COMPLETE		2
#define	ESCAPE_NOT_SUPPORTED	3

/*
 * Device Specific Sense Handlers return either an errno
 * or one of these three items.
 */

#define SCSIRET_NOERROR   0	/* No Error */
#define SCSIRET_RETRY    -1	/* Retry the command that got this sense */
#define SCSIRET_CONTINUE -2	/* Continue with standard sense processing */

/*
 * These entry points are called by the low-end drivers to get services from
 * whatever high-end drivers they are attached to.  Each device type has one
 * of these statically allocated.
 */
struct scsi_device {
	int	(*err_handler) __P((struct scsi_xfer *));
			/* returns -1 to say err processing done */
	void	(*start) __P((void *));

	int	(*async) __P((void));
	/*
	 * When called with `0' as the second argument, we expect status
	 * back from the upper-level driver.  When called with a `1',
	 * we're simply notifying the upper-level driver that the command
	 * is complete and expect no status back.
	 */
	void	(*done)  __P((struct scsi_xfer *));
};

/*
 * This structure describes the connection between an adapter driver and
 * a device driver, and is used by each to call services provided by
 * the other, and to allow generic scsi glue code to call these services
 * as well.
 */
struct scsi_link {
	u_int8_t scsi_version;		/* SCSI-I, SCSI-II, etc. */
	u_int8_t scsibus;		/* the Nth scsibus */
	u_int16_t target;		/* targ of this dev */
	u_int16_t lun;			/* lun of this dev */
	u_int16_t adapter_target;	/* what are we on the scsi bus */
	u_int16_t adapter_buswidth;	/* 8 (regular) or 16 (wide). (0 becomes 8) */
	u_int16_t openings;		/* available operations */
	u_int16_t active;		/* operations in progress */
	u_int16_t flags;		/* flags that all devices have */
#define	SDEV_REMOVABLE	 	0x0001	/* media is removable */
#define	SDEV_MEDIA_LOADED 	0x0002	/* device figures are still valid */
#define	SDEV_WAITING	 	0x0004	/* a process is waiting for this */
#define	SDEV_OPEN	 	0x0008	/* at least 1 open session */
#define	SDEV_DBX		0x00f0	/* debuging flags (scsi_debug.h) */
#define	SDEV_EJECTING		0x0100	/* eject on device close */
#define	SDEV_ATAPI		0x0200	/* device is ATAPI */
#define	SDEV_2NDBUS		0x0400	/* device is a 'second' bus device */
	u_int16_t quirks;		/* per-device oddities */
#define	SDEV_AUTOSAVE		0x0001	/* do implicit SAVEDATAPOINTER on disconnect */
#define	SDEV_NOSYNC		0x0002	/* does not grok SDTR */
#define	SDEV_NOWIDE		0x0004	/* does not grok WDTR */
#define	SDEV_NOTAGS		0x0008	/* lies about having tagged queueing */
#define	SDEV_NOLUNS		0x0010	/* does not grok LUNs */
#define	SDEV_FORCELUNS		0x0020	/* prehistoric drive/ctlr groks LUNs */
#define	SDEV_NOMODESENSE	0x0040	/* removable media/optical drives */
#define	SDEV_NOSTARTUNIT	0x0080	/* do not issue start unit requests in sd.c */
#define	SDEV_NOSYNCCACHE	0x0100	/* no SYNCHRONIZE_CACHE */
#define	ADEV_NOSENSE		0x0200	/* No request sense - ATAPI */
#define	ADEV_LITTLETOC		0x0400	/* little-endian TOC - ATAPI */
#define	ADEV_NOCAPACITY		0x0800
#define	ADEV_NOTUR		0x1000
#define	ADEV_NODOORLOCK		0x2000
#define SDEV_NOCDB6		0x4000  /* does not support 6 byte CDB */
	u_int8_t inquiry_flags;		/* copy of flags from probe INQUIRY */
	u_int8_t inquiry_flags2;	/* copy of flags2 from probe INQUIRY */
	struct	scsi_device *device;	/* device entry points etc. */
	void	*device_softc;		/* needed for call to foo_start */
	struct	scsi_adapter *adapter;	/* adapter entry points etc. */
	void	*adapter_softc;		/* needed for call to foo_scsi_cmd */
	u_char	luns;
};

int	scsiprint __P((void *, const char *));

/*
 * This describes matching information for scsi_inqmatch().  The more things
 * match, the higher the configuration priority.
 */
struct scsi_inquiry_pattern {
	u_int8_t type;
	boolean removable;
	char *vendor;
	char *product;
	char *revision;
};

/*
 * One of these is allocated and filled in for each scsi bus.
 * it holds pointers to allow the scsi bus to get to the driver
 * That is running each LUN on the bus
 * it also has a template entry which is the prototype struct
 * supplied by the adapter driver, this is used to initialise
 * the others, before they have the rest of the fields filled in
 */
struct scsibus_softc {
	struct device sc_dev;
	struct scsi_link *adapter_link;		/* prototype supplied by adapter */
	struct scsi_link ***sc_link;
	u_int16_t moreluns;
	u_int16_t sc_buswidth;
};

/*
 * This is used to pass information from the high-level configuration code
 * to the device-specific drivers.
 */
struct scsibus_attach_args {
	struct scsi_link *sa_sc_link;
	struct scsi_inquiry_data *sa_inqbuf;
};

/*
 * Each scsi transaction is fully described by one of these structures
 * It includes information about the source of the command and also the
 * device and adapter for which the command is destined.
 * (via the scsi_link structure)
 */