Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 678 insertions, 0 deletions

diff --git a/drivers/scsi/aha1740.c b/drivers/scsi/aha1740.c
new file mode 100644
index 000000000..786bf7f32
--- /dev/null
+++ b/drivers/scsi/aha1740.c
@@ -0,0 +1,678 @@
+/*  $Id$
+ *  1993/03/31
+ *  linux/kernel/aha1740.c
+ *
+ *  Based loosely on aha1542.c which is
+ *  Copyright (C) 1992  Tommy Thorn and
+ *  Modified by Eric Youngdale
+ *
+ *  This file is aha1740.c, written and
+ *  Copyright (C) 1992,1993  Brad McLean
+ *  brad@saturn.gaylord.com or brad@bradpc.gaylord.com.
+ *  
+ *  Modifications to makecode and queuecommand
+ *  for proper handling of multiple devices courteously
+ *  provided by Michael Weller, March, 1993
+ *
+ *  Multiple adapter support, extended translation detection,
+ *  update to current scsi subsystem changes, proc fs support,
+ *  working (!) module support based on patches from Andreas Arens,
+ *  by Andreas Degert <ad@papyrus.hamburg.com>, 2/1997
+ *
+ * aha1740_makecode may still need even more work
+ * if it doesn't work for your devices, take a look.
+ *
+ * Reworked for new_eh and new locking by Alan Cox <alan@lxorguk.ukuu.org.uk>
+ *
+ * Converted to EISA and generic DMA APIs by Marc Zyngier
+ * <maz@wild-wind.fr.eu.org>, 4/2003.
+ *
+ * Shared interrupt support added by Rask Ingemann Lambertsen
+ * <rask@sygehus.dk>, 10/2003
+ *
+ * For the avoidance of doubt the "preferred form" of this code is one which
+ * is in an open non patent encumbered format. Where cryptographic key signing
+ * forms part of the process of creating an executable the information
+ * including keys needed to generate an equivalently functional executable
+ * are deemed to be part of the source code.
+ */
+
+#include <linux/blkdev.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/ioport.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/eisa.h>
+#include <linux/dma-mapping.h>
+#include <linux/gfp.h>
+
+#include <asm/dma.h>
+#include <asm/io.h>
+
+#include "scsi.h"
+#include <scsi/scsi_host.h>
+#include "aha1740.h"
+
+/* IF YOU ARE HAVING PROBLEMS WITH THIS DRIVER, AND WANT TO WATCH
+   IT WORK, THEN:
+#define DEBUG
+*/
+#ifdef DEBUG
+#define DEB(x) x
+#else
+#define DEB(x)
+#endif
+
+struct aha1740_hostdata {
+	struct eisa_device *edev;
+	unsigned int translation;
+	unsigned int last_ecb_used;
+	dma_addr_t ecb_dma_addr;
+	struct ecb ecb[AHA1740_ECBS];
+};
+
+struct aha1740_sg {
+	struct aha1740_chain sg_chain[AHA1740_SCATTER];
+	dma_addr_t sg_dma_addr;
+	dma_addr_t buf_dma_addr;
+};
+
+#define HOSTDATA(host) ((struct aha1740_hostdata *) &host->hostdata)
+
+static inline struct ecb *ecb_dma_to_cpu (struct Scsi_Host *host,
+					  dma_addr_t dma)
+{
+	struct aha1740_hostdata *hdata = HOSTDATA (host);
+	dma_addr_t offset;
+
+	offset = dma - hdata->ecb_dma_addr;
+
+	return (struct ecb *)(((char *) hdata->ecb) + (unsigned int) offset);
+}
+
+static inline dma_addr_t ecb_cpu_to_dma (struct Scsi_Host *host, void *cpu)
+{
+	struct aha1740_hostdata *hdata = HOSTDATA (host);
+	dma_addr_t offset;
+    
+	offset = (char *) cpu - (char *) hdata->ecb;
+
+	return hdata->ecb_dma_addr + offset;
+}
+
+static int aha1740_show_info(struct seq_file *m, struct Scsi_Host *shpnt)
+{
+	struct aha1740_hostdata *host = HOSTDATA(shpnt);
+	seq_printf(m, "aha174x at IO:%lx, IRQ %d, SLOT %d.\n"
+		      "Extended translation %sabled.\n",
+		      shpnt->io_port, shpnt->irq, host->edev->slot,
+		      host->translation ? "en" : "dis");
+	return 0;
+}
+
+static int aha1740_makecode(unchar *sense, unchar *status)
+{
+	struct statusword
+	{
+		ushort	don:1,	/* Command Done - No Error */
+			du:1,	/* Data underrun */
+		    :1,	qf:1,	/* Queue full */
+		        sc:1,	/* Specification Check */
+		        dor:1,	/* Data overrun */
+		        ch:1,	/* Chaining Halted */
+		        intr:1,	/* Interrupt issued */
+		        asa:1,	/* Additional Status Available */
+		        sns:1,	/* Sense information Stored */
+		    :1,	ini:1,	/* Initialization Required */
+			me:1,	/* Major error or exception */
+		    :1,	eca:1,  /* Extended Contingent alliance */
+		    :1;
+	} status_word;
+	int retval = DID_OK;
+
+	status_word = * (struct statusword *) status;
+#ifdef DEBUG
+	printk("makecode from %x,%x,%x,%x %x,%x,%x,%x",
+	       status[0], status[1], status[2], status[3],
+	       sense[0], sense[1], sense[2], sense[3]);
+#endif
+	if (!status_word.don) { /* Anything abnormal was detected */
+		if ( (status[1]&0x18) || status_word.sc ) {
+			/*Additional info available*/
+			/* Use the supplied info for further diagnostics */
+			switch ( status[2] ) {
+			case 0x12:
+				if ( status_word.dor )
+					retval=DID_ERROR; /* It's an Overrun */
+				/* If not overrun, assume underrun and
+				 * ignore it! */
+			case 0x00: /* No info, assume no error, should
+				    * not occur */
+				break;
+			case 0x11:
+			case 0x21:
+				retval=DID_TIME_OUT;
+				break;
+			case 0x0a:
+				retval=DID_BAD_TARGET;
+				break;
+			case 0x04:
+			case 0x05:
+				retval=DID_ABORT;
+				/* Either by this driver or the
+				 * AHA1740 itself */
+				break;
+			default:
+				retval=DID_ERROR; /* No further
+						   * diagnostics
+						   * possible */
+			}
+		} else {
+			/* Michael suggests, and Brad concurs: */
+			if ( status_word.qf ) {
+				retval = DID_TIME_OUT; /* forces a redo */
+				/* I think this specific one should
+				 * not happen -Brad */
+				printk("aha1740.c: WARNING: AHA1740 queue overflow!\n");
+			} else
+				if ( status[0]&0x60 ) {
+					 /* Didn't find a better error */
+					retval = DID_ERROR;
+				}
+			/* In any other case return DID_OK so for example
+			   CONDITION_CHECKS make it through to the appropriate
+			   device driver */
+		}
+	}
+	/* Under all circumstances supply the target status -Michael */
+	return status[3] | retval << 16;
+}
+
+static int aha1740_test_port(unsigned int base)
+{
+	if ( inb(PORTADR(base)) & PORTADDR_ENH )
+		return 1;   /* Okay, we're all set */
+	
+	printk("aha174x: Board detected, but not in enhanced mode, so disabled it.\n");
+	return 0;
+}
+
+/* A "high" level interrupt handler */
+static irqreturn_t aha1740_intr_handle(int irq, void *dev_id)
+{
+	struct Scsi_Host *host = (struct Scsi_Host *) dev_id;
+        void (*my_done)(struct scsi_cmnd *);
+	int errstatus, adapstat;
+	int number_serviced;
+	struct ecb *ecbptr;
+	struct scsi_cmnd *SCtmp;
+	unsigned int base;
+	unsigned long flags;
+	int handled = 0;
+	struct aha1740_sg *sgptr;
+	struct eisa_device *edev;
+	
+	if (!host)
+		panic("aha1740.c: Irq from unknown host!\n");
+	spin_lock_irqsave(host->host_lock, flags);
+	base = host->io_port;
+	number_serviced = 0;
+	edev = HOSTDATA(host)->edev;
+
+	while(inb(G2STAT(base)) & G2STAT_INTPEND) {
+		handled = 1;
+		DEB(printk("aha1740_intr top of loop.\n"));
+		adapstat = inb(G2INTST(base));
+		ecbptr = ecb_dma_to_cpu (host, inl(MBOXIN0(base)));
+		outb(G2CNTRL_IRST,G2CNTRL(base)); /* interrupt reset */
+      
+		switch ( adapstat & G2INTST_MASK ) {
+		case	G2INTST_CCBRETRY:
+		case	G2INTST_CCBERROR:
+		case	G2INTST_CCBGOOD:
+			/* Host Ready -> Mailbox in complete */
+			outb(G2CNTRL_HRDY,G2CNTRL(base));
+			if (!ecbptr) {
+				printk("Aha1740 null ecbptr in interrupt (%x,%x,%x,%d)\n",
+				       inb(G2STAT(base)),adapstat,
+				       inb(G2INTST(base)), number_serviced++);
+				continue;
+			}
+			SCtmp = ecbptr->SCpnt;
+			if (!SCtmp) {
+				printk("Aha1740 null SCtmp in interrupt (%x,%x,%x,%d)\n",
+				       inb(G2STAT(base)),adapstat,
+				       inb(G2INTST(base)), number_serviced++);
+				continue;
+			}
+			sgptr = (struct aha1740_sg *) SCtmp->host_scribble;
+			scsi_dma_unmap(SCtmp);
+
+			/* Free the sg block */
+			dma_free_coherent (&edev->dev,
+					   sizeof (struct aha1740_sg),
+					   SCtmp->host_scribble,
+					   sgptr->sg_dma_addr);
+	    
+			/* Fetch the sense data, and tuck it away, in
+			   the required slot.  The Adaptec
+			   automatically fetches it, and there is no
+			   guarantee that we will still have it in the
+			   cdb when we come back */
+			if ( (adapstat & G2INTST_MASK) == G2INTST_CCBERROR ) {
+				memcpy(SCtmp->sense_buffer, ecbptr->sense, 
+				       SCSI_SENSE_BUFFERSIZE);
+				errstatus = aha1740_makecode(ecbptr->sense,ecbptr->status);
+			} else
+				errstatus = 0;
+			DEB(if (errstatus)
+			    printk("aha1740_intr_handle: returning %6x\n",
+				   errstatus));
+			SCtmp->result = errstatus;
+			my_done = ecbptr->done;
+			memset(ecbptr,0,sizeof(struct ecb)); 
+			if ( my_done )
+				my_done(SCtmp);
+			break;
+			
+		case	G2INTST_HARDFAIL:
+			printk(KERN_ALERT "aha1740 hardware failure!\n");
+			panic("aha1740.c");	/* Goodbye */
+			
+		case	G2INTST_ASNEVENT:
+			printk("aha1740 asynchronous event: %02x %02x %02x %02x %02x\n",
+			       adapstat,
+			       inb(MBOXIN0(base)),
+			       inb(MBOXIN1(base)),
+			       inb(MBOXIN2(base)),
+			       inb(MBOXIN3(base))); /* Say What? */
+			/* Host Ready -> Mailbox in complete */
+			outb(G2CNTRL_HRDY,G2CNTRL(base));
+			break;
+			
+		case	G2INTST_CMDGOOD:
+			/* set immediate command success flag here: */
+			break;
+			
+		case	G2INTST_CMDERROR:
+			/* Set immediate command failure flag here: */
+			break;
+		}
+		number_serviced++;
+	}
+
+	spin_unlock_irqrestore(host->host_lock, flags);
+	return IRQ_RETVAL(handled);
+}
+
+static int aha1740_queuecommand_lck(struct scsi_cmnd * SCpnt,
+				    void (*done)(struct scsi_cmnd *))
+{
+	unchar direction;
+	unchar *cmd = (unchar *) SCpnt->cmnd;
+	unchar target = scmd_id(SCpnt);
+	struct aha1740_hostdata *host = HOSTDATA(SCpnt->device->host);
+	unsigned long flags;
+	dma_addr_t sg_dma;
+	struct aha1740_sg *sgptr;
+	int ecbno, nseg;
+	DEB(int i);
+
+	if(*cmd == REQUEST_SENSE) {
+		SCpnt->result = 0;
+		done(SCpnt); 
+		return 0;
+	}
+
+#ifdef DEBUG
+	if (*cmd == READ_10 || *cmd == WRITE_10)
+		i = xscsi2int(cmd+2);
+	else if (*cmd == READ_6 || *cmd == WRITE_6)
+		i = scsi2int(cmd+2);
+	else
+		i = -1;
+	printk("aha1740_queuecommand: dev %d cmd %02x pos %d len %d ",
+	       target, *cmd, i, bufflen);
+	printk("scsi cmd:");
+	for (i = 0; i < SCpnt->cmd_len; i++) printk("%02x ", cmd[i]);
+	printk("\n");
+#endif
+
+	/* locate an available ecb */
+	spin_lock_irqsave(SCpnt->device->host->host_lock, flags);
+	ecbno = host->last_ecb_used + 1; /* An optimization */
+	if (ecbno >= AHA1740_ECBS)
+		ecbno = 0;
+	do {
+		if (!host->ecb[ecbno].cmdw)
+			break;
+		ecbno++;
+		if (ecbno >= AHA1740_ECBS)
+			ecbno = 0;
+	} while (ecbno != host->last_ecb_used);
+
+	if (host->ecb[ecbno].cmdw)
+		panic("Unable to find empty ecb for aha1740.\n");
+
+	host->ecb[ecbno].cmdw = AHA1740CMD_INIT; /* SCSI Initiator Command
+						    doubles as reserved flag */
+
+	host->last_ecb_used = ecbno;    
+	spin_unlock_irqrestore(SCpnt->device->host->host_lock, flags);
+
+#ifdef DEBUG
+	printk("Sending command (%d %x)...", ecbno, done);
+#endif
+
+	host->ecb[ecbno].cdblen = SCpnt->cmd_len; /* SCSI Command
+						   * Descriptor Block
+						   * Length */
+
+	direction = 0;
+	if (*cmd == READ_10 || *cmd == READ_6)
+		direction = 1;
+	else if (*cmd == WRITE_10 || *cmd == WRITE_6)
+		direction = 0;
+
+	memcpy(host->ecb[ecbno].cdb, cmd, SCpnt->cmd_len);
+
+	SCpnt->host_scribble = dma_alloc_coherent (&host->edev->dev,
+						   sizeof (struct aha1740_sg),
+						   &sg_dma, GFP_ATOMIC);
+	if(SCpnt->host_scribble == NULL) {
+		printk(KERN_WARNING "aha1740: out of memory in queuecommand!\n");
+		return 1;
+	}
+	sgptr = (struct aha1740_sg *) SCpnt->host_scribble;
+	sgptr->sg_dma_addr = sg_dma;
+
+	nseg = scsi_dma_map(SCpnt);
+	BUG_ON(nseg < 0);
+	if (nseg) {
+		struct scatterlist *sg;
+		struct aha1740_chain * cptr;
+		int i;
+		DEB(unsigned char * ptr);
+
+		host->ecb[ecbno].sg = 1;  /* SCSI Initiator Command
+					   * w/scatter-gather*/
+		cptr = sgptr->sg_chain;
+		scsi_for_each_sg(SCpnt, sg, nseg, i) {
+			cptr[i].datalen = sg_dma_len (sg);
+			cptr[i].dataptr = sg_dma_address (sg);
+		}
+		host->ecb[ecbno].datalen = nseg * sizeof(struct aha1740_chain);
+		host->ecb[ecbno].dataptr = sg_dma;
+#ifdef DEBUG
+		printk("cptr %x: ",cptr);
+		ptr = (unsigned char *) cptr;
+		for(i=0;i<24;i++) printk("%02x ", ptr[i]);
+#endif
+	} else {
+		host->ecb[ecbno].datalen = 0;
+		host->ecb[ecbno].dataptr = 0;
+	}
+	host->ecb[ecbno].lun = SCpnt->device->lun;
+	host->ecb[ecbno].ses = 1; /* Suppress underrun errors */
+	host->ecb[ecbno].dir = direction;
+	host->ecb[ecbno].ars = 1; /* Yes, get the sense on an error */
+	host->ecb[ecbno].senselen = 12;
+	host->ecb[ecbno].senseptr = ecb_cpu_to_dma (SCpnt->device->host,
+						    host->ecb[ecbno].sense);
+	host->ecb[ecbno].statusptr = ecb_cpu_to_dma (SCpnt->device->host,
+						     host->ecb[ecbno].status);
+	host->ecb[ecbno].done = done;
+	host->ecb[ecbno].SCpnt = SCpnt;
+#ifdef DEBUG
+	{
+		int i;
+		printk("aha1740_command: sending.. ");
+		for (i = 0; i < sizeof(host->ecb[ecbno]) - 10; i++)
+			printk("%02x ", ((unchar *)&host->ecb[ecbno])[i]);
+	}
+	printk("\n");
+#endif
+	if (done) {
+	/* The Adaptec Spec says the card is so fast that the loops
+           will only be executed once in the code below. Even if this
+           was true with the fastest processors when the spec was
+           written, it doesn't seem to be true with today's fast
+           processors. We print a warning if the code is executed more
+           often than LOOPCNT_WARN. If this happens, it should be
+           investigated. If the count reaches LOOPCNT_MAX, we assume
+           something is broken; since there is no way to return an
+           error (the return value is ignored by the mid-level scsi
+           layer) we have to panic (and maybe that's the best thing we
+           can do then anyhow). */
+
+#define LOOPCNT_WARN 10		/* excessive mbxout wait -> syslog-msg */
+#define LOOPCNT_MAX 1000000	/* mbxout deadlock -> panic() after ~ 2 sec. */
+		int loopcnt;
+		unsigned int base = SCpnt->device->host->io_port;
+		DEB(printk("aha1740[%d] critical section\n",ecbno));
+
+		spin_lock_irqsave(SCpnt->device->host->host_lock, flags);
+		for (loopcnt = 0; ; loopcnt++) {
+			if (inb(G2STAT(base)) & G2STAT_MBXOUT) break;
+			if (loopcnt == LOOPCNT_WARN) {
+				printk("aha1740[%d]_mbxout wait!\n",ecbno);
+			}
+			if (loopcnt == LOOPCNT_MAX)
+				panic("aha1740.c: mbxout busy!\n");
+		}
+		outl (ecb_cpu_to_dma (SCpnt->device->host, host->ecb + ecbno),
+		      MBOXOUT0(base));
+		for (loopcnt = 0; ; loopcnt++) {
+			if (! (inb(G2STAT(base)) & G2STAT_BUSY)) break;
+			if (loopcnt == LOOPCNT_WARN) {
+				printk("aha1740[%d]_attn wait!\n",ecbno);
+			}
+			if (loopcnt == LOOPCNT_MAX)
+				panic("aha1740.c: attn wait failed!\n");
+		}
+		outb(ATTN_START | (target & 7), ATTN(base)); /* Start it up */
+		spin_unlock_irqrestore(SCpnt->device->host->host_lock, flags);
+		DEB(printk("aha1740[%d] request queued.\n",ecbno));
+	} else
+		printk(KERN_ALERT "aha1740_queuecommand: done can't be NULL\n");
+	return 0;
+}
+
+static DEF_SCSI_QCMD(aha1740_queuecommand)
+
+/* Query the board for its irq_level and irq_type.  Nothing else matters
+   in enhanced mode on an EISA bus. */
+
+static void aha1740_getconfig(unsigned int base, unsigned int *irq_level,
+			      unsigned int *irq_type,
+			      unsigned int *translation)
+{
+	static int intab[] = { 9, 10, 11, 12, 0, 14, 15, 0 };
+
+	*irq_level = intab[inb(INTDEF(base)) & 0x7];
+	*irq_type  = (inb(INTDEF(base)) & 0x8) >> 3;
+	*translation = inb(RESV1(base)) & 0x1;
+	outb(inb(INTDEF(base)) | 0x10, INTDEF(base));
+}
+
+static int aha1740_biosparam(struct scsi_device *sdev,
+			     struct block_device *dev,
+			     sector_t capacity, int* ip)
+{
+	int size = capacity;
+	int extended = HOSTDATA(sdev->host)->translation;
+
+	DEB(printk("aha1740_biosparam\n"));
+	if (extended && (ip[2] > 1024))	{
+		ip[0] = 255;
+		ip[1] = 63;
+		ip[2] = size / (255 * 63);
+	} else {
+		ip[0] = 64;
+		ip[1] = 32;
+		ip[2] = size >> 11;
+	}
+	return 0;
+}
+
+static int aha1740_eh_abort_handler (struct scsi_cmnd *dummy)
+{
+/*
+ * From Alan Cox :
+ * The AHA1740 has firmware handled abort/reset handling. The "head in
+ * sand" kernel code is correct for once 8)
+ *
+ * So we define a dummy handler just to keep the kernel SCSI code as
+ * quiet as possible...
+ */
+
+	return SUCCESS;
+}
+
+static struct scsi_host_template aha1740_template = {
+	.module           = THIS_MODULE,
+	.proc_name        = "aha1740",
+	.show_info        = aha1740_show_info,
+	.name             = "Adaptec 174x (EISA)",
+	.queuecommand     = aha1740_queuecommand,
+	.bios_param       = aha1740_biosparam,
+	.can_queue        = AHA1740_ECBS,
+	.this_id          = 7,
+	.sg_tablesize     = AHA1740_SCATTER,
+	.use_clustering   = ENABLE_CLUSTERING,
+	.eh_abort_handler = aha1740_eh_abort_handler,
+};
+
+static int aha1740_probe (struct device *dev)
+{
+	int slotbase, rc;
+	unsigned int irq_level, irq_type, translation;
+	struct Scsi_Host *shpnt;
+	struct aha1740_hostdata *host;
+	struct eisa_device *edev = to_eisa_device (dev);
+
+	DEB(printk("aha1740_probe: \n"));
+	
+	slotbase = edev->base_addr + EISA_VENDOR_ID_OFFSET;
+	if (!request_region(slotbase, SLOTSIZE, "aha1740")) /* See if in use */
+		return -EBUSY;
+	if (!aha1740_test_port(slotbase))
+		goto err_release_region;
+	aha1740_getconfig(slotbase,&irq_level,&irq_type,&translation);
+	if ((inb(G2STAT(slotbase)) &
+	     (G2STAT_MBXOUT|G2STAT_BUSY)) != G2STAT_MBXOUT) {
+		/* If the card isn't ready, hard reset it */
+		outb(G2CNTRL_HRST, G2CNTRL(slotbase));
+		outb(0, G2CNTRL(slotbase));
+	}
+	printk(KERN_INFO "Configuring slot %d at IO:%x, IRQ %u (%s)\n",
+	       edev->slot, slotbase, irq_level, irq_type ? "edge" : "level");
+	printk(KERN_INFO "aha174x: Extended translation %sabled.\n",
+	       translation ? "en" : "dis");
+	shpnt = scsi_host_alloc(&aha1740_template,
+			      sizeof(struct aha1740_hostdata));
+	if(shpnt == NULL)
+		goto err_release_region;
+
+	shpnt->base = 0;
+	shpnt->io_port = slotbase;
+	shpnt->n_io_port = SLOTSIZE;
+	shpnt->irq = irq_level;
+	shpnt->dma_channel = 0xff;
+	host = HOSTDATA(shpnt);
+	host->edev = edev;
+	host->translation = translation;
+	host->ecb_dma_addr = dma_map_single (&edev->dev, host->ecb,
+					     sizeof (host->ecb),
+					     DMA_BIDIRECTIONAL);
+	if (!host->ecb_dma_addr) {
+		printk (KERN_ERR "aha1740_probe: Couldn't map ECB, giving up\n");
+		scsi_host_put (shpnt);
+		goto err_host_put;
+	}
+	
+	DEB(printk("aha1740_probe: enable interrupt channel %d\n",irq_level));
+	if (request_irq(irq_level,aha1740_intr_handle,irq_type ? 0 : IRQF_SHARED,
+			"aha1740",shpnt)) {
+		printk(KERN_ERR "aha1740_probe: Unable to allocate IRQ %d.\n",
+		       irq_level);
+		goto err_unmap;
+	}
+
+	eisa_set_drvdata (edev, shpnt);
+
+	rc = scsi_add_host (shpnt, dev);
+	if (rc)
+		goto err_irq;
+
+	scsi_scan_host (shpnt);
+	return 0;
+
+ err_irq:
+ 	free_irq(irq_level, shpnt);
+ err_unmap:
+	dma_unmap_single (&edev->dev, host->ecb_dma_addr,
+			  sizeof (host->ecb), DMA_BIDIRECTIONAL);
+ err_host_put:
+	scsi_host_put (shpnt);
+ err_release_region:
+	release_region(slotbase, SLOTSIZE);
+
+	return -ENODEV;
+}
+
+static int aha1740_remove (struct device *dev)
+{
+	struct Scsi_Host *shpnt = dev_get_drvdata(dev);
+	struct aha1740_hostdata *host = HOSTDATA (shpnt);
+
+	scsi_remove_host(shpnt);
+	
+	free_irq (shpnt->irq, shpnt);
+	dma_unmap_single (dev, host->ecb_dma_addr,
+			  sizeof (host->ecb), DMA_BIDIRECTIONAL);
+	release_region (shpnt->io_port, SLOTSIZE);
+
+	scsi_host_put (shpnt);
+	
+	return 0;
+}
+
+static struct eisa_device_id aha1740_ids[] = {
+	{ "ADP0000" },		/* 1740  */
+	{ "ADP0001" },		/* 1740A */
+	{ "ADP0002" },		/* 1742A */
+	{ "ADP0400" },		/* 1744  */
+	{ "" }
+};
+MODULE_DEVICE_TABLE(eisa, aha1740_ids);
+
+static struct eisa_driver aha1740_driver = {
+	.id_table = aha1740_ids,
+	.driver   = {
+		.name    = "aha1740",
+		.probe   = aha1740_probe,
+		.remove  = aha1740_remove,
+	},
+};
+
+static __init int aha1740_init (void)
+{
+	return eisa_driver_register (&aha1740_driver);
+}
+
+static __exit void aha1740_exit (void)
+{
+	eisa_driver_unregister (&aha1740_driver);
+}
+
+module_init (aha1740_init);
+module_exit (aha1740_exit);
+
+MODULE_LICENSE("GPL");