extractedLnx/linux-2.6.9/drivers/scsi/arm/acornscsi.c_acornscsi_sbicintr.c

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);/* -> PHASE_COMMAND, PHASE_COMMANDPAUSED	*/
	    break;

	case 0x8b:			/* status in					*/
					/* -> PHASE_STATUSIN				*/
	    /* MESSAGE IN -> STATUS */
	    acornscsi_readstatusbyte(host);
	    host->scsi.phase = PHASE_STATUSIN;
	    break;

	case 0x8e:			/* message out					*/
					/* -> PHASE_MSGOUT				*/
	    /* MESSAGE IN -> MESSAGE OUT */
	    acornscsi_sendmessage(host);
	    break;

	case 0x8f:			/* message in					*/
	    acornscsi_message(host);	/* -> PHASE_MSGIN, PHASE_DISCONNECT		*/
	    break;

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

    case PHASE_DATAIN:			/* STATE: transferred data in			*/
	/*
	 * This is simple - if we disconnect then the DMA address & count is
	 * correct.
	 */
	switch (ssr) {
	case 0x19:			/* -> PHASE_DATAIN				*/
	case 0x89:			/* -> PHASE_DATAIN				*/
	    acornscsi_abortcmd(host, host->SCpnt->tag);
	    return INTR_IDLE;

	case 0x1b:			/* -> PHASE_STATUSIN				*/
	case 0x4b:			/* -> PHASE_STATUSIN				*/
	case 0x8b:			/* -> PHASE_STATUSIN				*/
	    /* DATA IN -> STATUS */
	    host->scsi.SCp.scsi_xferred = host->SCpnt->request_bufflen -
					  acornscsi_sbic_xfcount(host);
	    acornscsi_dma_stop(host);
	    acornscsi_readstatusbyte(host);
	    host->scsi.phase = PHASE_STATUSIN;
	    break;

	case 0x1e:			/* -> PHASE_MSGOUT				*/
	case 0x4e:			/* -> PHASE_MSGOUT				*/
	case 0x8e:			/* -> PHASE_MSGOUT				*/
	    /* DATA IN -> MESSAGE OUT */
	    host->scsi.SCp.scsi_xferred = host->SCpnt->request_bufflen -
					  acornscsi_sbic_xfcount(host);
	    acornscsi_dma_stop(host);
	    acornscsi_sendmessage(host);
	    break;

	case 0x1f:			/* message in					*/
	case 0x4f:			/* message in					*/
	case 0x8f:			/* message in					*/
	    /* DATA IN -> MESSAGE IN */
	    host->scsi.SCp.scsi_xferred = host->SCpnt->request_bufflen -
					  acornscsi_sbic_xfcount(host);
	    acornscsi_dma_stop(host);
	    acornscsi_message(host);	/* -> PHASE_MSGIN, PHASE_DISCONNECT		*/
	    break;

	default:
	    printk(KERN_ERR "scsi%d.%c: PHASE_DATAIN, 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_DATAOUT: 		/* STATE: transferred data out			*/
	/*
	 * This is more complicated - if we disconnect, the DMA could be 12
	 * bytes ahead of us.  We need to correct this.
	 */
	switch (ssr) {
	case 0x18:			/* -> PHASE_DATAOUT				*/
	case 0x88:			/* -> PHASE_DATAOUT				*/
	    acornscsi_abortcmd(host, host->SCpnt->tag);
	    return INTR_IDLE;

	case 0x1b:			/* -> PHASE_STATUSIN				*/
	case 0x4b:			/* -> PHASE_STATUSIN				*/
	case 0x8b:			/* -> PHASE_STATUSIN				*/
	    /* DATA OUT -> STATUS */
	    host->scsi.SCp.scsi_xferred = host->SCpnt->request_bufflen -
					  acornscsi_sbic_xfcount(host);
	    acornscsi_dma_stop(host);
	    acornscsi_dma_adjust(host);
	    acornscsi_readstatusbyte(host);
	    host->scsi.phase = PHASE_STATUSIN;
	    break;

	case 0x1e:			/* -> PHASE_MSGOUT				*/
	case 0x4e:			/* -> PHASE_MSGOUT				*/
	case 0x8e:			/* -> PHASE_MSGOUT				*/
	    /* DATA OUT -> MESSAGE OUT */
	    host->scsi.SCp.scsi_xferred = host->SCpnt->request_bufflen -
					  acornscsi_sbic_xfcount(host);
	    acornscsi_dma_stop(host);
	    acornscsi_dma_adjust(host);
	    acornscsi_sendmessage(host);
	    break;

	case 0x1f:			/* message in					*/
	case 0x4f:			/* message in					*/
	case 0x8f:			/* message in					*/
	    /* DATA OUT -> MESSAGE IN */
	    host->scsi.SCp.scsi_xferred = host->SCpnt->request_bufflen -
					  acornscsi_sbic_xfcount(host);
	    acornscsi_dma_stop(host);
	    acornscsi_dma_adjust(host);
	    acornscsi_message(host);	/* -> PHASE_MSGIN, PHASE_DISCONNECT		*/
	    break;

	default:
	    printk(KERN_ERR "scsi%d.%c: PHASE_DATAOUT, 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_STATUSIN:		/* STATE: status in complete			*/
	switch (ssr) {
	case 0x1f:			/* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
	case 0x8f:			/* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
	    /* STATUS -> MESSAGE IN */
	    acornscsi_message(host);
	    break;

	case 0x1e:			/* -> PHASE_MSGOUT				*/
	case 0x8e:			/* -> PHASE_MSGOUT				*/
	    /* STATUS -> MESSAGE OUT */
	    acornscsi_sendmessage(host);
	    break;

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

    case PHASE_MSGIN:			/* STATE: message in				*/
	switch (ssr) {
	case 0x1e:			/* -> PHASE_MSGOUT				*/
	case 0x4e:			/* -> PHASE_MSGOUT				*/
	case 0x8e:			/* -> PHASE_MSGOUT				*/
	    /* MESSAGE IN -> MESSAGE OUT */
	    acornscsi_sendmessage(host);
	    break;

	case 0x1f:			/* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
	case 0x2f:
	case 0x4f:
	case 0x8f:
	    acornscsi_message(host);
	    break;

	case 0x85:
	    printk("scsi%d.%c: strange message in disconnection\n",
		host->host->host_no, acornscsi_target(host));
	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
	    acornscsi_done(host, &host->SCpnt, DID_ERROR);
	    break;

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

    case PHASE_DONE:			/* STATE: received status & message		*/
	switch (ssr) {
	case 0x85:			/* -> PHASE_IDLE				*/
	    acornscsi_done(host, &host->SCpnt, DID_OK);
	    return INTR_NEXT_COMMAND;

	case 0x1e:
	case 0x8e:
	    acornscsi_sendmessage(host);
	    break;

	default:
	    printk(KERN_ERR "scsi%d.%c: PHASE_DONE, 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_PROCESSING;

    case PHASE_ABORTED:
	switch (ssr) {
	case 0x85:
	    if (host->SCpnt)
		acornscsi_done(host, &host->SCpnt, DID_ABORT);
	    else {
		clear_bit(host->scsi.reconnected.target * 8 + host->scsi.reconnected.lun,
			  host->busyluns);
		host->scsi.phase = PHASE_IDLE;
	    }
	    return INTR_NEXT_COMMAND;

	case 0x1e:
	case 0x2e:
	case 0x4e:
	case 0x8e:
	    acornscsi_sendmessage(host);
	    break;

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

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