acornscsi.c

h内核

		host->host->host_no, acornscsi_target(host));
	return 0;
    }

    residual = host->SCpnt->request_bufflen - host->scsi.SCp.scsi_xferred;

    sbic_arm_write(host->scsi.io_port, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer);
    sbic_arm_writenext(host->scsi.io_port, residual >> 16);
    sbic_arm_writenext(host->scsi.io_port, residual >> 8);
    sbic_arm_writenext(host->scsi.io_port, residual);
    acornscsi_sbic_issuecmd(host, CMND_XFERINFO);
    return 1;
}

/* =========================================================================================
 * Connection & Disconnection
 */
/*
 * Function : acornscsi_reconnect(AS_Host *host)
 * Purpose  : reconnect a previously disconnected command
 * Params   : host - host specific data
 * Remarks  : SCSI spec says:
 *		'The set of active pointers is restored from the set
 *		 of saved pointers upon reconnection of the I/O process'
 */
static
int acornscsi_reconnect(AS_Host *host)
{
    unsigned int target, lun, ok = 0;

    target = sbic_arm_read(host->scsi.io_port, SBIC_SOURCEID);

    if (!(target & 8))
	printk(KERN_ERR "scsi%d: invalid source id after reselection "
		"- device fault?\n",
		host->host->host_no);

    target &= 7;

    if (host->SCpnt && !host->scsi.disconnectable) {
	printk(KERN_ERR "scsi%d.%d: reconnected while command in "
		"progress to target %d?\n",
		host->host->host_no, target, host->SCpnt->device->id);
	host->SCpnt = NULL;
    }

    lun = sbic_arm_read(host->scsi.io_port, SBIC_DATA) & 7;

    host->scsi.reconnected.target = target;
    host->scsi.reconnected.lun = lun;
    host->scsi.reconnected.tag = 0;

    if (host->scsi.disconnectable && host->SCpnt &&
	host->SCpnt->device->id == target && host->SCpnt->device->lun == lun)
	ok = 1;

    if (!ok && queue_probetgtlun(&host->queues.disconnected, target, lun))
	ok = 1;

    ADD_STATUS(target, 0x81, host->scsi.phase, 0);

    if (ok) {
	host->scsi.phase = PHASE_RECONNECTED;
    } else {
	/* this doesn't seem to work */
	printk(KERN_ERR "scsi%d.%c: reselected with no command "
		"to reconnect with\n",
		host->host->host_no, '0' + target);
	acornscsi_dumplog(host, target);
	acornscsi_abortcmd(host, 0);
	if (host->SCpnt) {
	    queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt);
	    host->SCpnt = NULL;
	}
    }
    acornscsi_sbic_issuecmd(host, CMND_NEGATEACK);
    return !ok;
}

/*
 * Function: int acornscsi_reconect_finish(AS_Host *host)
 * Purpose : finish reconnecting a command
 * Params  : host - host to complete
 * Returns : 0 if failed
 */
static
int acornscsi_reconnect_finish(AS_Host *host)
{
    if (host->scsi.disconnectable && host->SCpnt) {
	host->scsi.disconnectable = 0;
	if (host->SCpnt->device->id  == host->scsi.reconnected.target &&
	    host->SCpnt->device->lun == host->scsi.reconnected.lun &&
	    host->SCpnt->tag         == host->scsi.reconnected.tag) {
#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
	    DBG(host->SCpnt, printk("scsi%d.%c: reconnected",
		    host->host->host_no, acornscsi_target(host)));
#endif
	} else {
	    queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt);
#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
	    DBG(host->SCpnt, printk("scsi%d.%c: had to move command "
		    "to disconnected queue\n",
		    host->host->host_no, acornscsi_target(host)));
#endif
	    host->SCpnt = NULL;
	}
    }
    if (!host->SCpnt) {
	host->SCpnt = queue_remove_tgtluntag(&host->queues.disconnected,
				host->scsi.reconnected.target,
				host->scsi.reconnected.lun,
				host->scsi.reconnected.tag);
#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
	DBG(host->SCpnt, printk("scsi%d.%c: had to get command",
		host->host->host_no, acornscsi_target(host)));
#endif
    }

    if (!host->SCpnt)
	acornscsi_abortcmd(host, host->scsi.reconnected.tag);
    else {
	/*
	 * Restore data pointer from SAVED pointers.
	 */
	host->scsi.SCp = host->SCpnt->SCp;
#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
	printk(", data pointers: [%p, %X]",
		host->scsi.SCp.ptr, host->scsi.SCp.this_residual);
#endif
    }
#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
    printk("\n");
#endif

    host->dma.transferred = host->scsi.SCp.scsi_xferred;

    return host->SCpnt != NULL;
}

/*
 * Function: void acornscsi_disconnect_unexpected(AS_Host *host)
 * Purpose : handle an unexpected disconnect
 * Params  : host - host on which disconnect occurred
 */
static
void acornscsi_disconnect_unexpected(AS_Host *host)
{
    printk(KERN_ERR "scsi%d.%c: unexpected disconnect\n",
	    host->host->host_no, acornscsi_target(host));
#if (DEBUG & DEBUG_ABORT)
    acornscsi_dumplog(host, 8);
#endif

    acornscsi_done(host, &host->SCpnt, DID_ERROR);
}

/*
 * Function: void acornscsi_abortcmd(AS_host *host, unsigned char tag)
 * Purpose : abort a currently executing command
 * Params  : host - host with connected command to abort
 *	     tag  - tag to abort
 */
static
void acornscsi_abortcmd(AS_Host *host, unsigned char tag)
{
    host->scsi.phase = PHASE_ABORTED;
    sbic_arm_write(host->scsi.io_port, SBIC_CMND, CMND_ASSERTATN);

    msgqueue_flush(&host->scsi.msgs);
#ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
    if (tag)
	msgqueue_addmsg(&host->scsi.msgs, 2, ABORT_TAG, tag);
    else
#endif
	msgqueue_addmsg(&host->scsi.msgs, 1, ABORT);
}

/* ==========================================================================================
 * Interrupt routines.
 */
/*
 * Function: int acornscsi_sbicintr(AS_Host *host)
 * Purpose : handle interrupts from SCSI device
 * Params  : host - host to process
 * Returns : INTR_PROCESS if expecting another SBIC interrupt
 *	     INTR_IDLE if no interrupt
 *	     INTR_NEXT_COMMAND if we have finished processing the command
 */
static
intr_ret_t acornscsi_sbicintr(AS_Host *host, int in_irq)
{
    unsigned int asr, ssr;

    asr = sbic_arm_read(host->scsi.io_port, SBIC_ASR);
    if (!(asr & ASR_INT))
	return INTR_IDLE;

    ssr = sbic_arm_read(host->scsi.io_port, SBIC_SSR);

#if (DEBUG & DEBUG_PHASES)
    print_sbic_status(asr, ssr, host->scsi.phase);
#endif

    ADD_STATUS(8, ssr, host->scsi.phase, in_irq);

    if (host->SCpnt && !host->scsi.disconnectable)
	ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq);

    switch (ssr) {
    case 0x00:				/* reset state - not advanced			*/
	printk(KERN_ERR "scsi%d: reset in standard mode but wanted advanced mode.\n",
		host->host->host_no);
	/* setup sbic - WD33C93A */
	sbic_arm_write(host->scsi.io_port, SBIC_OWNID, OWNID_EAF | host->host->this_id);
	sbic_arm_write(host->scsi.io_port, SBIC_CMND, CMND_RESET);
	return INTR_IDLE;

    case 0x01:				/* reset state - advanced			*/
	sbic_arm_write(host->scsi.io_port, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI);
	sbic_arm_write(host->scsi.io_port, SBIC_TIMEOUT, TIMEOUT_TIME);
	sbic_arm_write(host->scsi.io_port, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA);
	sbic_arm_write(host->scsi.io_port, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP);
	msgqueue_flush(&host->scsi.msgs);
	return INTR_IDLE;

    case 0x41:				/* unexpected disconnect aborted command	*/
	acornscsi_disconnect_unexpected(host);
	return INTR_NEXT_COMMAND;
    }

    switch (host->scsi.phase) {
    case PHASE_CONNECTING:		/* STATE: command removed from issue queue	*/
	switch (ssr) {
	case 0x11:			/* -> PHASE_CONNECTED				*/
	    /* BUS FREE -> SELECTION */
	    host->scsi.phase = PHASE_CONNECTED;
	    msgqueue_flush(&host->scsi.msgs);
	    host->dma.transferred = host->scsi.SCp.scsi_xferred;
	    /* 33C93 gives next interrupt indicating bus phase */
	    asr = sbic_arm_read(host->scsi.io_port, SBIC_ASR);
	    if (!(asr & ASR_INT))
		break;
	    ssr = sbic_arm_read(host->scsi.io_port, SBIC_SSR);
	    ADD_STATUS(8, ssr, host->scsi.phase, 1);
	    ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, 1);
	    goto connected;
	    
	case 0x42:			/* select timed out				*/
					/* -> PHASE_IDLE				*/
	    acornscsi_done(host, &host->SCpnt, DID_NO_CONNECT);
	    return INTR_NEXT_COMMAND;

	case 0x81:			/* -> PHASE_RECONNECTED or PHASE_ABORTED	*/
	    /* BUS FREE -> RESELECTION */
	    host->origSCpnt = host->SCpnt;
	    host->SCpnt = NULL;
	    msgqueue_flush(&host->scsi.msgs);
	    acornscsi_reconnect(host);
	    break;

	default:
	    printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTING, SSR %02X?\n",
		    host->host->host_no, acornscsi_target(host), ssr);
	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
	    acornscsi_abortcmd(host, host->SCpnt->tag);
	}
	return INTR_PROCESSING;

    connected:
    case PHASE_CONNECTED:		/* STATE: device selected ok			*/
	switch (ssr) {
#ifdef NONSTANDARD
	case 0x8a:			/* -> PHASE_COMMAND, PHASE_COMMANDPAUSED	*/
	    /* SELECTION -> COMMAND */
	    acornscsi_sendcommand(host);
	    break;

	case 0x8b:			/* -> PHASE_STATUS				*/
	    /* SELECTION -> STATUS */
	    acornscsi_readstatusbyte(host);
	    host->scsi.phase = PHASE_STATUSIN;
	    break;
#endif

	case 0x8e:			/* -> PHASE_MSGOUT				*/
	    /* SELECTION ->MESSAGE OUT */
	    host->scsi.phase = PHASE_MSGOUT;
	    acornscsi_buildmessages(host);
	    acornscsi_sendmessage(host);
	    break;

	/* these should not happen */
	case 0x85:			/* target disconnected				*/
	    acornscsi_done(host, &host->SCpnt, DID_ERROR);
	    break;

	default:
	    printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTED, SSR %02X?\n",
		    host->host->host_no, acornscsi_target(host), ssr);
	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
	    acornscsi_abortcmd(host, host->SCpnt->tag);
	}
	return INTR_PROCESSING;

    case PHASE_MSGOUT:			/* STATE: connected & sent IDENTIFY message	*/
	/*
	 * SCSI standard says that MESSAGE OUT phases can be followed by a
	 * DATA phase, STATUS phase, MESSAGE IN phase or COMMAND phase
	 */
	switch (ssr) {
	case 0x8a:			/* -> PHASE_COMMAND, PHASE_COMMANDPAUSED	*/
	case 0x1a:			/* -> PHASE_COMMAND, PHASE_COMMANDPAUSED	*/
	    /* MESSAGE OUT -> COMMAND */
	    acornscsi_sendcommand(host);
	    break;

	case 0x8b:			/* -> PHASE_STATUS				*/
	case 0x1b:			/* -> PHASE_STATUS				*/
	    /* MESSAGE OUT -> STATUS */
	    acornscsi_readstatusbyte(host);
	    host->scsi.phase = PHASE_STATUSIN;
	    break;

	case 0x8e:			/* -> PHASE_MSGOUT				*/
	    /* MESSAGE_OUT(MESSAGE_IN) ->MESSAGE OUT */
	    acornscsi_sendmessage(host);
	    break;

	case 0x4f:			/* -> PHASE_MSGIN, PHASE_DISCONNECT		*/
	case 0x1f:			/* -> PHASE_MSGIN, PHASE_DISCONNECT		*/
	    /* MESSAGE OUT -> MESSAGE IN */
	    acornscsi_message(host);
	    break;

	default:
	    printk(KERN_ERR "scsi%d.%c: PHASE_MSGOUT, SSR %02X?\n",
		    host->host->host_no, acornscsi_target(host), ssr);
	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
	}
	return INTR_PROCESSING;

    case PHASE_COMMAND: 		/* STATE: connected & command sent		*/
	switch (ssr) {
	case 0x18:			/* -> PHASE_DATAOUT				*/
	    /* COMMAND -> DATA OUT */
	    if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len)
		acornscsi_abortcmd(host, host->SCpnt->tag);
	    acornscsi_dma_setup(host, DMA_OUT);
	    if (!acornscsi_starttransfer(host))
		acornscsi_abortcmd(host, host->SCpnt->tag);
	    host->scsi.phase = PHASE_DATAOUT;
	    return INTR_IDLE;

	case 0x19:			/* -> PHASE_DATAIN				*/
	    /* COMMAND -> DATA IN */
	    if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len)
		acornscsi_abortcmd(host, host->SCpnt->tag);
	    acornscsi_dma_setup(host, DMA_IN);
	    if (!acornscsi_starttransfer(host))
		acornscsi_abortcmd(host, host->SCpnt->tag);
	    host->scsi.phase = PHASE_DATAIN;
	    return INTR_IDLE;

	case 0x1b:			/* -> PHASE_STATUS				*/
	    /* COMMAND -> STATUS */
	    acornscsi_readstatusbyte(host);
	    host->scsi.phase = PHASE_STATUSIN;
	    break;

	case 0x1e:			/* -> PHASE_MSGOUT				*/
	    /* COMMAND -> MESSAGE OUT */
	    acornscsi_sendmessage(host);
	    break;

	case 0x1f:			/* -> PHASE_MSGIN, PHASE_DISCONNECT		*/
	    /* COMMAND -> MESSAGE IN */
	    acornscsi_message(host);
	    break;

	default:
	    printk(KERN_ERR "scsi%d.%c: PHASE_COMMAND, SSR %02X?\n",
		    host->host->host_no, acornscsi_target(host), ssr);
	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
	}
	return INTR_PROCESSING;

    case PHASE_DISCONNECT:		/* STATE: connected, received DISCONNECT msg	*/
	if (ssr == 0x85) {		/* -> PHASE_IDLE				*/
	    host->scsi.disconnectable = 1;
	    host->scsi.reconnected.tag = 0;
	    host->scsi.phase = PHASE_IDLE;
	    host->stats.disconnects += 1;
	} else {
	    printk(KERN_ERR "scsi%d.%c: PHASE_DISCONNECT, SSR %02X instead of disconnect?\n",
		    host->host->host_no, acornscsi_target(host), ssr);
	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
	}
	return INTR_NEXT_COMMAND;

    case PHASE_IDLE:			/* STATE: disconnected				*/
	if (ssr == 0x81)		/* -> PHASE_RECONNECTED or PHASE_ABORTED	*/
	    acornscsi_reconnect(host);
	else {
	    printk(KERN_ERR "scsi%d.%c: PHASE_IDLE, SSR %02X while idle?\n",
		    host->host->host_no, acornscsi_target(host), ssr);
	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
	}
	return INTR_PROCESSING;

    case PHASE_RECONNECTED:		/* STATE: device reconnected to initiator	*/
	/*
	 * Command reconnected - if MESGIN, get message - it may be
	 * the tag.  If not, get command out of disconnected queue
	 */
	/*
	 * If we reconnected and we're not in MESSAGE IN phase after IDENTIFY,
	 * reconnect I_T_L command
	 */
	if (ssr != 0x8f && !acornscsi_reconnect_finish(host))
	    return INTR_IDLE;
	ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq);
	switch (ssr) {
	case 0x88:			/* data out phase				*/
					/* -> PHASE_DATAOUT				*/
	    /* MESSAGE IN -> DATA OUT */
	    acornscsi_dma_setup(host, DMA_OUT);
	    if (!acornscsi_starttransfer(host))
		acornscsi_abortcmd(host, host->SCpnt->tag);
	    host->scsi.phase = PHASE_DATAOUT;
	    return INTR_IDLE;

	case 0x89:			/* data in phase				*/
					/* -> PHASE_DATAIN				*/
	    /* MESSAGE IN -> DATA IN */
	    acornscsi_dma_setup(host, DMA_IN);
	    if (!acornscsi_starttransfer(host))
		acornscsi_abortcmd(host, host->SCpnt->tag);
	    host->scsi.phase = PHASE_DATAIN;
	    return INTR_IDLE;

	case 0x8a:			/* command out					*/
	    /* MESSAGE IN -> COMMAND */
	    acornscsi_sendcommand(host);/* -