/*
* Copyright (c) 1994 Peter Galbavy. 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 Peter Galbavy.
* 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.
*/
/*
* ACB. Holds additional information for each SCSI command Comments: We
* need a separate scsi command block because we may need to overwrite it
* with a request sense command. Basically, we refrain from fiddling with
* the scsi_xfer struct (except do the expected updating of return values).
* We'll generally update: xs->{flags,resid,error,sense,status} and
* occasionally xs->retries.
*/
struct acb {
TAILQ_ENTRY(acb) chain;
struct scsipi_xfer *xs; /* SCSI xfer ctrl block from above */
int flags; /* Status */
#define ACB_QNONE 0
#define ACB_QFREE 1
#define ACB_QREADY 2
#define ACB_QNEXUS 3
#define ACB_QBITS 0x07
#define ACB_CHKSENSE 0x08
#define ACB_ABORTED 0x10
#define ACB_RESET 0x80
#define ACB_SETQ(e, q) do (e)->flags = ((e)->flags&~ACB_QBITS)|(q); while(0)
struct scsipi_generic cmd; /* SCSI command block */
int clen;
char *daddr; /* Saved data pointer */
int dleft; /* Residue */
u_char stat; /* SCSI status byte */
/*
* Some info about each (possible) target on the SCSI bus. This should
* probably have been a "per target+lunit" structure, but we'll leave it at
* this for now.
*/
struct spc_tinfo {
int cmds; /* #commands processed */
int dconns; /* #disconnects */
int touts; /* #timeouts */
int perrs; /* #parity errors */
int senses; /* #request sense commands sent */
ushort lubusy; /* What local units/subr. are busy? */
u_char flags;
#define T_NEED_TO_RESET 0x01 /* Should send a BUS_DEV_RESET */
#define T_NEGOTIATE 0x02 /* (Re)Negotiate synchronous options */
#define T_BUSY 0x04 /* Target is busy, i.e. cmd in progress */
#define T_SYNCMODE 0x08 /* sync mode has been negotiated */
#define T_SYNCHOFF 0x10 /* .. */
#define T_RSELECTOFF 0x20 /* .. */
u_char period; /* Period suggestion */
u_char offset; /* Offset suggestion */
u_char width; /* Width suggestion */
};
TAILQ_HEAD(, acb) free_list, ready_list, nexus_list;
struct acb *sc_nexus; /* current command */
struct acb sc_acb[8]; /* one per target */
struct spc_tinfo sc_tinfo[8];
/* Data about the current nexus (updated for every cmd switch) */
u_char *sc_dp; /* Current data pointer */
size_t sc_dleft; /* Data bytes left to transfer */
u_char *sc_cp; /* Current command pointer */
size_t sc_cleft; /* Command bytes left to transfer */
/* Adapter state */
int sc_phase; /* Copy of what bus phase we are in */
int sc_prevphase; /* Copy of what bus phase we were in */
u_char sc_state; /* State applicable to the adapter */
u_char sc_flags;
u_char sc_selid; /* Reselection ID */
volatile u_char sc_spcinitialized; /* */
/* Message stuff */
u_char sc_msgpriq; /* Messages we want to send */
u_char sc_msgout; /* What message is on its way out? */
u_char sc_msgoutq; /* Messages sent during last MESSAGE OUT */
u_char sc_lastmsg; /* Message last transmitted */
u_char sc_currmsg; /* Message currently ready to transmit */
#define SPC_MAX_MSG_LEN 8
u_char sc_omess[SPC_MAX_MSG_LEN];
u_char *sc_omp; /* Outgoing message pointer */
u_char sc_imess[SPC_MAX_MSG_LEN];
u_char *sc_imp; /* Incoming message pointer */
size_t sc_imlen;
/* Hardware stuff */
int sc_freq; /* Clock frequency in MHz */
int sc_id; /* our scsi id */
int sc_minsync; /* Minimum sync period / 4 */
int sc_maxsync; /* Maximum sync period / 4 */
/* values for sc_state */
#define SPC_INIT 0x00
#define SPC_IDLE 0x01 /* waiting for something to do */
#define ESP_TMP_UNAVAIL 0x02 /* Don't accept SCSI commands */
#define SPC_SELECTING 0x03 /* SCSI command is arbiting */
#define SPC_RESELECTED 0x04 /* Has been reselected */
#define SPC_HASNEXUS 0x05 /* Actively using the SCSI bus */
#define SPC_CLEANING 0x06
#define ESP_SBR 0x07 /* Expect a SCSI RST because we commanded it */
#define SPC_CONNECTED 0x08 /* Actively using the SCSI bus */
#define SPC_DISCONNECT 0x09 /* MSG_DISCONNECT received */
#define SPC_CMDCOMPLETE 0x0a /* MSG_CMDCOMPLETE received */
/* values for sc_flags */
#define SPC_DROP_MSGI 0x01 /* Discard all msgs (parity err detected) */
#define SPC_DOINGDMA 0x02 /* The FIFO data path is active! */
#define SPC_BUSFREE_OK 0x04 /* Bus free phase is OK. */
#define SPC_SYNCHNEGO 0x08 /* Synch negotiation in progress. */
#define SPC_DISCON 0x10 /* Target sent DISCONNECT msg */
#define SPC_ABORTING 0x20 /* Bailing out */
#define ESP_ICCS 0x40 /* Expect status phase results */
#define ESP_WAITI 0x80 /* Waiting for non-DMA data to arrive */
