patch-2.0.31 linux/drivers/scsi/ide-scsi.c

• Lines: 602
• Date: Mon Aug 4 11:45:55 1997
• Orig file: v2.0.30/linux/drivers/scsi/ide-scsi.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.0.30/linux/drivers/scsi/ide-scsi.c linux/drivers/scsi/ide-scsi.c
@@ -0,0 +1,601 @@
+/*
+ * linux/drivers/scsi/ide-scsi.c	Version 0.3 - ALPHA	Jul  24, 1997
+ *
+ * Copyright (C) 1996, 1997 Gadi Oxman <gadio@netvision.net.il>
+ */
+
+/*
+ * Emulation of a SCSI host adapter for IDE ATAPI devices.
+ *
+ * With this driver, one can use the Linux SCSI drivers instead of the
+ * native IDE ATAPI drivers.
+ *
+ * Ver 0.1   Dec  3 96   Initial version.
+ * Ver 0.2   Jan 26 97   Fixed bug in cleanup_module() and added emulation
+ *                        of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
+ *                        to Janos Farkas for pointing this out.
+ *                       Avoid using bitfields in structures for m68k.
+ *                       Added Scather/Gather and DMA support.
+ * Ver 0.3   Jul 24 97   Add support for ATAPI PD/CD drives.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/blkdev.h>
+#include <linux/errno.h>
+#include <linux/hdreg.h>
+#include <linux/malloc.h>
+
+#include <asm/io.h>
+#include <asm/bitops.h>
+
+#include "../block/ide.h"
+
+#include "scsi.h"
+#include "hosts.h"
+#include "sd.h"
+#include "ide-scsi.h"
+
+#define IDESCSI_DEBUG_LOG		0
+
+typedef struct idescsi_pc_s {
+	u8 c[12];				/* Actual packet bytes */
+	int request_transfer;			/* Bytes to transfer */
+	int actually_transferred;		/* Bytes actually transferred */
+	int buffer_size;			/* Size of our data buffer */
+	struct request *rq;			/* The corresponding request */
+	byte *buffer;				/* Data buffer */
+	byte *current_position;			/* Pointer into the above buffer */
+	struct scatterlist *sg;			/* Scather gather table */
+	int b_count;				/* Bytes transferred from current entry */
+	Scsi_Cmnd *scsi_cmd;			/* SCSI command */
+	void (*done)(Scsi_Cmnd *);		/* Scsi completion routine */
+	unsigned int flags;			/* Status/Action flags */
+} idescsi_pc_t;
+
+/*
+ *	Packet command status bits.
+ */
+#define PC_DMA_IN_PROGRESS		0	/* 1 while DMA in progress */
+#define PC_WRITING			1	/* Data direction */
+
+typedef struct {
+	ide_drive_t *drive;
+	idescsi_pc_t *pc;			/* Current packet command */
+	unsigned int flags;			/* Status/Action flags */
+	int media;
+} idescsi_scsi_t;
+
+/*
+ *	Per ATAPI device status bits.
+ */
+#define IDESCSI_DRQ_INTERRUPT		0	/* DRQ interrupt device */
+
+/*
+ *	ide-scsi requests.
+ */
+#define IDESCSI_PC_RQ			90
+
+/*
+ *	Bits of the interrupt reason register.
+ */
+#define IDESCSI_IREASON_COD	0x1		/* Information transferred is command */
+#define IDESCSI_IREASON_IO	0x2		/* The device requests us to read */
+
+#define IDE_MIN(a,b)      ((a)<(b) ? (a):(b))
+#define IDE_MAX(a,b)      ((a)>(b) ? (a):(b))
+
+static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
+{
+	while (bcount--)
+		IN_BYTE (IDE_DATA_REG);
+}
+
+static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
+{
+	while (bcount--)
+		OUT_BYTE (0, IDE_DATA_REG);
+}
+
+/*
+ *	PIO data transfer routines using the scather gather table.
+ */
+static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
+{
+	int count;
+
+	while (bcount) {
+		if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
+			printk (KERN_ERR "ide-scsi: scather gather table too small, discarding data\n");
+			idescsi_discard_data (drive, bcount);
+			return;
+		}
+		count = IDE_MIN (pc->sg->length - pc->b_count, bcount);
+		atapi_input_bytes (drive, pc->sg->address + pc->b_count, count);
+		bcount -= count; pc->b_count += count;
+		if (pc->b_count == pc->sg->length) {
+			pc->sg++;
+			pc->b_count = 0;
+		}
+	}
+}
+
+static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
+{
+	int count;
+
+	while (bcount) {
+		if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
+			printk (KERN_ERR "ide-scsi: scather gather table too small, padding with zeros\n");
+			idescsi_output_zeros (drive, bcount);
+			return;
+		}
+		count = IDE_MIN (pc->sg->length - pc->b_count, bcount);
+		atapi_output_bytes (drive, pc->sg->address + pc->b_count, count);
+		bcount -= count; pc->b_count += count;
+		if (pc->b_count == pc->sg->length) {
+			pc->sg++;
+			pc->b_count = 0;
+		}
+	}
+}
+
+/*
+ *	Most of the SCSI commands are supported directly by ATAPI devices.
+ *	idescsi_transform_pc handles the few exceptions.
+ */
+static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc)
+{
+	idescsi_scsi_t *scsi = drive->scsi;
+	u8 *c = pc->c, *buf = pc->buffer, *sc = pc->scsi_cmd->cmnd;
+	int i;
+
+	if (scsi->media == TYPE_ROM) {
+		if (c[0] == READ_6 || c[0] == WRITE_6) {
+			c[8] = c[4];		c[5] = c[3];		c[4] = c[2];
+			c[3] = c[1] & 0x1f;	c[2] = 0;		c[1] &= 0xe0;
+			c[0] += (READ_10 - READ_6);
+		}
+		if (c[0] == MODE_SENSE || (c[0] == MODE_SELECT && buf[3] == 8)) {
+			pc->request_transfer -= 4;
+			memset (c, 0, 12);
+			c[0] = sc[0] | 0x40;	c[2] = sc[2];		c[8] = sc[4] - 4;
+			if (c[0] == MODE_SENSE_10) return;
+			for (i = 0; i <= 7; i++) buf[i] = 0;
+			for (i = 8; i < pc->buffer_size - 4; i++) buf[i] = buf[i + 4];
+		}
+	}
+}
+
+static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc)
+{
+	idescsi_scsi_t *scsi = drive->scsi;
+	u8 *buf = pc->buffer;
+	int i;
+
+	if (scsi->media == TYPE_ROM) {
+		if (pc->c[0] == MODE_SENSE_10 && pc->scsi_cmd->cmnd[0] == MODE_SENSE) {
+			buf[0] = buf[1];	buf[1] = buf[2];
+			buf[2] = 0;		buf[3] = 8;
+			for (i = pc->buffer_size - 1; i >= 12; i--) buf[i] = buf[i - 4];
+			for (i = 11; i >= 4; i--) buf[i] = 0;
+		}
+		if (pc->c[0] == INQUIRY)
+			buf[2] |= 2;
+	}
+}
+
+static inline void idescsi_free_bh (struct buffer_head *bh)
+{
+	struct buffer_head *bhp;
+
+	while (bh) {
+		bhp = bh;
+		bh = bh->b_reqnext;
+		kfree (bhp);
+	}
+}
+
+void idescsi_end_request (byte uptodate, ide_hwgroup_t *hwgroup)
+{
+	ide_drive_t *drive = hwgroup->drive;
+	idescsi_scsi_t *scsi = drive->scsi;
+	struct request *rq = hwgroup->rq;
+	idescsi_pc_t *pc = (idescsi_pc_t *) rq->buffer;
+
+	if (rq->cmd != IDESCSI_PC_RQ) {
+		ide_end_request (uptodate, hwgroup);
+		return;
+	}
+	ide_end_drive_cmd (drive, 0, 0);
+	if (rq->errors >= ERROR_MAX) {
+#if IDESCSI_DEBUG_LOG
+		printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
+#endif /* IDESCSI_DEBUG_LOG */
+		pc->scsi_cmd->result = DID_ERROR << 16;
+	} else if (rq->errors) {
+#if IDESCSI_DEBUG_LOG
+		printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
+#endif /* IDESCSI_DEBUG_LOG */
+		pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
+	} else {
+#if IDESCSI_DEBUG_LOG
+		printk ("ide-scsi: %s: success for %lu\n", drive->name, pc->scsi_cmd->serial_number);
+#endif /* IDESCSI_DEBUG_LOG */
+		pc->scsi_cmd->result = DID_OK << 16;
+		idescsi_transform_pc2 (drive, pc);
+	}
+	pc->done(pc->scsi_cmd);
+	idescsi_free_bh (rq->bh);
+	kfree(pc); kfree(rq);
+	scsi->pc = NULL;
+}
+
+/*
+ *	Our interrupt handler.
+ */
+static void idescsi_pc_intr (ide_drive_t *drive)
+{
+	idescsi_scsi_t *scsi = drive->scsi;
+	byte status, ireason;
+	int bcount;
+	idescsi_pc_t *pc=scsi->pc;
+	struct request *rq = pc->rq;
+	unsigned int temp;
+
+#if IDESCSI_DEBUG_LOG
+	printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
+#endif /* IDESCSI_DEBUG_LOG */
+
+	if (clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
+#if IDESCSI_DEBUG_LOG
+		printk ("ide-scsi: %s: DMA complete\n", drive->name);
+#endif /* IDESCSI_DEBUG_LOG */
+		pc->actually_transferred=pc->request_transfer;
+		(void) (HWIF(drive)->dmaproc(ide_dma_abort, drive));
+	}
+
+	status = GET_STAT();						/* Clear the interrupt */
+
+	if ((status & DRQ_STAT) == 0) {					/* No more interrupts */
+#if IDESCSI_DEBUG_LOG
+		printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
+#endif /* IDESCSI_DEBUG_LOG */
+		sti();
+		if (status & ERR_STAT)
+			rq->errors++;
+		idescsi_end_request (1, HWGROUP(drive));
+		return;
+	}
+	bcount = IN_BYTE (IDE_BCOUNTH_REG) << 8 | IN_BYTE (IDE_BCOUNTL_REG);
+	ireason = IN_BYTE (IDE_IREASON_REG);
+
+	if (ireason & IDESCSI_IREASON_COD) {
+		printk (KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
+		ide_do_reset (drive);
+		return;
+	}
+	if (ireason & IDESCSI_IREASON_IO) {
+		temp = pc->actually_transferred + bcount;
+		if ( temp > pc->request_transfer) {
+			if (temp > pc->buffer_size) {
+				printk (KERN_ERR "ide-scsi: The scsi wants to send us more data than expected - discarding data\n");
+				idescsi_discard_data (drive,bcount);
+				ide_set_handler (drive,&idescsi_pc_intr,WAIT_CMD);
+				return;
+			}
+#if IDESCSI_DEBUG_LOG
+			printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
+#endif /* IDESCSI_DEBUG_LOG */
+		}
+	}
+	if (ireason & IDESCSI_IREASON_IO) {
+		if (pc->sg)
+			idescsi_input_buffers (drive, pc, bcount);
+		else
+			atapi_input_bytes (drive,pc->current_position,bcount);
+	} else {
+		if (pc->sg)
+			idescsi_output_buffers (drive, pc, bcount);
+		else
+			atapi_output_bytes (drive,pc->current_position,bcount);
+	}
+	pc->actually_transferred+=bcount;				/* Update the current position */
+	pc->current_position+=bcount;
+
+	ide_set_handler (drive,&idescsi_pc_intr,WAIT_CMD);		/* And set the interrupt handler again */
+}
+
+static void idescsi_transfer_pc (ide_drive_t *drive)
+{
+	idescsi_scsi_t *scsi = drive->scsi;
+	byte ireason;
+
+	if (ide_wait_stat (drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
+		printk (KERN_ERR "ide-scsi: Strange, packet command initiated yet DRQ isn't asserted\n");
+		return;
+	}
+	ireason = IN_BYTE (IDE_IREASON_REG);
+	if ((ireason & (IDESCSI_IREASON_IO | IDESCSI_IREASON_COD)) != IDESCSI_IREASON_COD) {
+		printk (KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while issuing a packet command\n");
+		ide_do_reset (drive);
+		return;
+	}
+	ide_set_handler (drive, &idescsi_pc_intr, WAIT_CMD);	/* Set the interrupt routine */
+	atapi_output_bytes (drive, scsi->pc->c, 12);		/* Send the actual packet */
+}
+
+/*
+ *	Issue a packet command
+ */
+static void idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
+{
+	idescsi_scsi_t *scsi = drive->scsi;
+	int bcount;
+	struct request *rq = pc->rq;
+	int dma_ok = 0;
+
+	scsi->pc=pc;							/* Set the current packet command */
+	pc->actually_transferred=0;					/* We haven't transferred any data yet */
+	pc->current_position=pc->buffer;
+	bcount = IDE_MIN (pc->request_transfer, 63 * 1024);		/* Request to transfer the entire buffer at once */
+
+	if (drive->using_dma && rq->bh)
+		dma_ok=!HWIF(drive)->dmaproc(test_bit (PC_WRITING, &pc->flags) ? ide_dma_write : ide_dma_read, drive);
+
+	OUT_BYTE (drive->ctl,IDE_CONTROL_REG);
+	OUT_BYTE (dma_ok,IDE_FEATURE_REG);
+	OUT_BYTE (bcount >> 8,IDE_BCOUNTH_REG);
+	OUT_BYTE (bcount & 0xff,IDE_BCOUNTL_REG);
+	OUT_BYTE (drive->select.all,IDE_SELECT_REG);
+
+	if (dma_ok) {
+		set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
+		(void) (HWIF(drive)->dmaproc(ide_dma_begin, drive));
+	}
+	if (test_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
+		ide_set_handler (drive, &idescsi_transfer_pc, WAIT_CMD);
+		OUT_BYTE (WIN_PACKETCMD, IDE_COMMAND_REG);		/* Issue the packet command */
+	} else {
+		OUT_BYTE (WIN_PACKETCMD, IDE_COMMAND_REG);
+		idescsi_transfer_pc (drive);
+	}
+}
+
+/*
+ *	idescsi_do_request is our request handling function.
+ */
+void idescsi_do_request (ide_drive_t *drive, struct request *rq, unsigned long block)
+{
+#if IDESCSI_DEBUG_LOG
+	printk (KERN_INFO "rq_status: %d, rq_dev: %u, cmd: %d, errors: %d\n",rq->rq_status,(unsigned int) rq->rq_dev,rq->cmd,rq->errors);
+	printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %ld\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
+#endif /* IDESCSI_DEBUG_LOG */
+
+	if (rq->cmd == IDESCSI_PC_RQ) {
+		idescsi_issue_pc (drive, (idescsi_pc_t *) rq->buffer);
+		return;
+	}
+	printk (KERN_ERR "ide-scsi: %s: unsupported command in request queue (%x)\n", drive->name, rq->cmd);
+	idescsi_end_request (0,HWGROUP (drive));
+}
+
+int idescsi_open (struct inode *inode, struct file *filp, ide_drive_t *drive)
+{
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+void idescsi_ide_release (struct inode *inode, struct file *filp, ide_drive_t *drive)
+{
+	MOD_DEC_USE_COUNT;
+}
+
+static ide_drive_t *idescsi_drives[MAX_HWIFS * MAX_DRIVES];
+static int idescsi_initialized = 0;
+
+int idescsi_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+	return -EINVAL;
+}
+
+static struct proc_dir_entry idescsi_proc_dir = {PROC_SCSI_IDESCSI, 8, "ide-scsi", S_IFDIR | S_IRUGO | S_IXUGO, 2};
+
+/*
+ *	idescsi_setup will register the driver for each scsi.
+ */
+void idescsi_setup (ide_drive_t *drive)
+{
+	idescsi_scsi_t *scsi;
+	int i, id;
+
+	if (!idescsi_initialized) {
+		idescsi_initialized = 1;
+		for (i = 0; i < MAX_HWIFS * MAX_DRIVES; i++)
+			idescsi_drives[i] = NULL;
+	}
+	if ((scsi = (idescsi_scsi_t *) kmalloc (sizeof (idescsi_scsi_t), GFP_KERNEL)) == NULL) {
+		printk (KERN_ERR "ide-scsi: %s: Can't allocate a scsi structure\n", drive->name);
+		return;
+	}
+	for (id = 0; id < MAX_HWIFS * MAX_DRIVES && idescsi_drives[id]; id++);
+	idescsi_drives[id] = drive;
+	drive->scsi = scsi;
+	drive->ready_stat = 0;
+	memset (scsi, 0, sizeof (idescsi_scsi_t));
+	scsi->drive = drive;
+	scsi->media = (drive->id->config >> 8) & 0x1f;
+	if (drive->id && (drive->id->config & 0x0060) == 0x20)
+		set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
+}
+
+int idescsi_detect (Scsi_Host_Template *host_template)
+{
+	struct Scsi_Host *host;
+	int id;
+
+	host_template->proc_dir = &idescsi_proc_dir;
+	host = scsi_register(host_template, 0);
+	for (id = 0; id < MAX_HWIFS * MAX_DRIVES && idescsi_drives[id]; id++);
+	host->max_id = id;
+	host->can_queue = host->cmd_per_lun * id;
+	return 1;
+}
+
+int idescsi_release (struct Scsi_Host *host)
+{
+	return 0;
+}
+
+const char *idescsi_info (struct Scsi_Host *host)
+{
+	return "SCSI host adapter emulation for IDE ATAPI devices";
+}
+
+static inline struct buffer_head *idescsi_kmalloc_bh (int count)
+{
+	struct buffer_head *bh, *bhp, *first_bh;
+
+	if ((first_bh = bhp = bh = kmalloc (sizeof(struct buffer_head), GFP_ATOMIC)) == NULL)
+		goto abort;
+	memset (bh, 0, sizeof (struct buffer_head));
+	bh->b_reqnext = NULL;
+	while (--count) {
+		if ((bh = kmalloc (sizeof(struct buffer_head), GFP_ATOMIC)) == NULL)
+			goto abort;
+		memset (bh, 0, sizeof (struct buffer_head));
+		bhp->b_reqnext = bh;
+		bhp = bh;
+		bh->b_reqnext = NULL;
+	}
+	return first_bh;
+abort:
+	idescsi_free_bh (first_bh);
+	return NULL;
+}
+
+static inline int idescsi_set_direction (idescsi_pc_t *pc)
+{
+	switch (pc->c[0]) {
+		case READ_6: case READ_10: case READ_12:
+			clear_bit (PC_WRITING, &pc->flags);
+			return 0;
+		case WRITE_6: case WRITE_10: case WRITE_12:
+			set_bit (PC_WRITING, &pc->flags);
+			return 0;
+		default:
+			return 1;
+	}
+}
+
+static inline struct buffer_head *idescsi_dma_bh (ide_drive_t *drive, idescsi_pc_t *pc)
+{
+	struct buffer_head *bh = NULL, *first_bh = NULL;
+	int segments = pc->scsi_cmd->use_sg;
+	struct scatterlist *sg = pc->scsi_cmd->request_buffer;
+
+	if (!drive->using_dma || pc->request_transfer % 1024)
+		return NULL;
+	if (idescsi_set_direction(pc))
+		return NULL;
+	if (segments) {
+		if ((first_bh = bh = idescsi_kmalloc_bh (segments)) == NULL)
+			return NULL;
+#if IDESCSI_DEBUG_LOG
+		printk ("ide-scsi: %s: building DMA table, %d segments, %dkB total\n", drive->name, segments, pc->request_transfer >> 10);
+#endif /* IDESCSI_DEBUG_LOG */
+		while (segments--) {
+			bh->b_data = sg->address;
+			bh->b_size = sg->length;
+			bh = bh->b_reqnext;
+			sg++;
+		}
+	} else {
+		if ((first_bh = bh = idescsi_kmalloc_bh (1)) == NULL)
+			return NULL;
+#if IDESCSI_DEBUG_LOG
+		printk ("ide-scsi: %s: building DMA table for a single buffer (%dkB)\n", drive->name, pc->request_transfer >> 10);
+#endif /* IDESCSI_DEBUG_LOG */
+		bh->b_data = pc->scsi_cmd->request_buffer;
+		bh->b_size = pc->request_transfer;
+	}
+	return first_bh;
+}
+
+int idescsi_queue (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
+{
+	ide_drive_t *drive = idescsi_drives[cmd->target];
+	struct request *rq = NULL;
+	idescsi_pc_t *pc = NULL;
+
+#if IDESCSI_DEBUG_LOG
+	printk ("idescsi_queue called, serial = %lu, cmd[0] = %x, id = %d\n", cmd->serial_number, cmd->cmnd[0], cmd->target);
+#endif	/* IDESCSI_DEBUG_LOG */
+
+	if (!drive) {
+		printk (KERN_ERR "ide-scsi: drive id %d not present\n", cmd->target);
+		goto abort;
+	}
+	pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
+	rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
+	if (rq == NULL || pc == NULL) {
+		printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
+		goto abort;
+	}
+
+	memset (pc->c, 0, 12);
+	pc->flags = 0;
+	pc->rq = rq;
+	memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
+	if (cmd->use_sg) {
+		pc->buffer = NULL;
+		pc->sg = cmd->request_buffer;
+	} else {
+		pc->buffer = cmd->request_buffer;
+		pc->sg = NULL;
+	}
+	pc->b_count = 0;
+	pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
+	pc->scsi_cmd = cmd;
+	pc->done = done;
+	idescsi_transform_pc1 (drive, pc);
+
+	ide_init_drive_cmd (rq);
+	rq->buffer = (char *) pc;
+	rq->bh = idescsi_dma_bh (drive, pc);
+	rq->cmd = IDESCSI_PC_RQ;
+	(void) ide_do_drive_cmd (drive, rq, ide_end);
+	return 0;
+abort:
+	if (pc) kfree (pc);
+	if (rq) kfree (rq);
+	cmd->result = DID_ERROR << 16;
+	done(cmd);
+	return 0;
+}
+
+int idescsi_abort (Scsi_Cmnd *cmd)
+{
+	return SCSI_ABORT_SNOOZE;
+}
+
+int idescsi_reset (Scsi_Cmnd *cmd, unsigned int resetflags)
+{
+	return SCSI_RESET_PUNT;
+}
+
+int idescsi_bios (Disk *disk, kdev_t dev, int *parm)
+{
+	ide_drive_t *drive = idescsi_drives[disk->device->id];
+
+	if (drive->cyl && drive->head && drive->sect) {
+		parm[0] = drive->head;
+		parm[1] = drive->sect;
+		parm[2] = drive->cyl;
+	}
+	return 0;
+}