drivers/usb/storage/isd200.c

/* Transport & Protocol Driver for In-System Design, Inc. ISD200 ASIC
 *
 * Current development and maintenance:
 *   (C) 2001-2002 Björn Stenberg (bjorn@haxx.se)
 *
 * Developed with the assistance of:
 *   (C) 2002 Alan Stern <stern@rowland.org>
 *
 * Initial work:
 *   (C) 2000 In-System Design, Inc. (support@in-system.com)
 *
 * The ISD200 ASIC does not natively support ATA devices.  The chip
 * does implement an interface, the ATA Command Block (ATACB) which provides
 * a means of passing ATA commands and ATA register accesses to a device.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * History:
 *
 *  2002-10-19: Removed the specialized transfer routines.
 *		(Alan Stern <stern@rowland.harvard.edu>)
 *  2001-02-24: Removed lots of duplicate code and simplified the structure.
 *	      (bjorn@haxx.se)
 *  2002-01-16: Fixed endianness bug so it works on the ppc arch.
 *	      (Luc Saillard <luc@saillard.org>)
 *  2002-01-17: All bitfields removed.
 *	      (bjorn@haxx.se)
 */


/* Include files */

#include <linux/jiffies.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/ata.h>
#include <linux/hdreg.h>
#include <linux/scatterlist.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>

#include "usb.h"
#include "transport.h"
#include "protocol.h"
#include "debug.h"
#include "scsiglue.h"

MODULE_DESCRIPTION("Driver for In-System Design, Inc. ISD200 ASIC");
MODULE_AUTHOR("Björn Stenberg <bjorn@haxx.se>");
MODULE_LICENSE("GPL");

static int isd200_Initialization(struct us_data *us);


/*
 * The table of devices
 */
#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
		    vendorName, productName, useProtocol, useTransport, \
		    initFunction, flags) \
{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
  .driver_info = (flags)|(USB_US_TYPE_STOR<<24) }

struct usb_device_id isd200_usb_ids[] = {
#	include "unusual_isd200.h"
	{ }		/* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, isd200_usb_ids);

#undef UNUSUAL_DEV
#undef USUAL_DEV

/*
 * The flags table
 */
#define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
		    vendor_name, product_name, use_protocol, use_transport, \
		    init_function, Flags) \
{ \
	.vendorName = vendor_name,	\
	.productName = product_name,	\
	.useProtocol = use_protocol,	\
	.useTransport = use_transport,	\
	.initFunction = init_function,	\
}

static struct us_unusual_dev isd200_unusual_dev_list[] = {
#	include "unusual_isd200.h"
	{ }		/* Terminating entry */
};

#undef UNUSUAL_DEV
#undef USUAL_DEV


/* Timeout defines (in Seconds) */

#define ISD200_ENUM_BSY_TIMEOUT		35
#define ISD200_ENUM_DETECT_TIMEOUT      30
#define ISD200_DEFAULT_TIMEOUT		30

/* device flags */
#define DF_ATA_DEVICE		0x0001
#define DF_MEDIA_STATUS_ENABLED	0x0002
#define DF_REMOVABLE_MEDIA	0x0004

/* capability bit definitions */
#define CAPABILITY_DMA		0x01
#define CAPABILITY_LBA		0x02

/* command_setX bit definitions */
#define COMMANDSET_REMOVABLE	0x02
#define COMMANDSET_MEDIA_STATUS 0x10

/* ATA Vendor Specific defines */
#define ATA_ADDRESS_DEVHEAD_STD      0xa0
#define ATA_ADDRESS_DEVHEAD_LBA_MODE 0x40    
#define ATA_ADDRESS_DEVHEAD_SLAVE    0x10

/* Action Select bits */
#define ACTION_SELECT_0	     0x01
#define ACTION_SELECT_1	     0x02
#define ACTION_SELECT_2	     0x04
#define ACTION_SELECT_3	     0x08
#define ACTION_SELECT_4	     0x10
#define ACTION_SELECT_5	     0x20
#define ACTION_SELECT_6	     0x40
#define ACTION_SELECT_7	     0x80

/* Register Select bits */
#define REG_ALTERNATE_STATUS	0x01
#define REG_DEVICE_CONTROL	0x01
#define REG_ERROR		0x02
#define REG_FEATURES		0x02
#define REG_SECTOR_COUNT	0x04
#define REG_SECTOR_NUMBER	0x08
#define REG_CYLINDER_LOW	0x10
#define REG_CYLINDER_HIGH	0x20
#define REG_DEVICE_HEAD		0x40
#define REG_STATUS		0x80
#define REG_COMMAND		0x80

/* ATA registers offset definitions */
#define ATA_REG_ERROR_OFFSET		1
#define ATA_REG_LCYL_OFFSET		4
#define ATA_REG_HCYL_OFFSET		5
#define ATA_REG_STATUS_OFFSET		7

/* ATA error definitions not in <linux/hdreg.h> */
#define ATA_ERROR_MEDIA_CHANGE		0x20

/* ATA command definitions not in <linux/hdreg.h> */
#define ATA_COMMAND_GET_MEDIA_STATUS	0xDA
#define ATA_COMMAND_MEDIA_EJECT		0xED

/* ATA drive control definitions */
#define ATA_DC_DISABLE_INTERRUPTS	0x02
#define ATA_DC_RESET_CONTROLLER		0x04
#define ATA_DC_REENABLE_CONTROLLER	0x00

/*
 *  General purpose return codes
 */ 

#define ISD200_ERROR		-1
#define ISD200_GOOD		 0

/*
 * Transport return codes
 */

#define ISD200_TRANSPORT_GOOD       0   /* Transport good, command good     */
#define ISD200_TRANSPORT_FAILED     1   /* Transport good, command failed   */
#define ISD200_TRANSPORT_ERROR      2   /* Transport bad (i.e. device dead) */

/* driver action codes */
#define	ACTION_READ_STATUS	0
#define	ACTION_RESET		1
#define	ACTION_REENABLE		2
#define	ACTION_SOFT_RESET	3
#define	ACTION_ENUM		4
#define	ACTION_IDENTIFY		5


/*
 * ata_cdb struct
 */


union ata_cdb {
	struct {
		unsigned char SignatureByte0;
		unsigned char SignatureByte1;
		unsigned char ActionSelect;
		unsigned char RegisterSelect;
		unsigned char TransferBlockSize;
		unsigned char WriteData3F6;
		unsigned char WriteData1F1;
		unsigned char WriteData1F2;
		unsigned char WriteData1F3;
		unsigned char WriteData1F4;
		unsigned char WriteData1F5;
		unsigned char WriteData1F6;
		unsigned char WriteData1F7;
		unsigned char Reserved[3];
	} generic;

	struct {
		unsigned char SignatureByte0;
		unsigned char SignatureByte1;
		unsigned char ActionSelect;
		unsigned char RegisterSelect;
		unsigned char TransferBlockSize;
		unsigned char AlternateStatusByte;
		unsigned char ErrorByte;
		unsigned char SectorCountByte;
		unsigned char SectorNumberByte;
		unsigned char CylinderLowByte;
		unsigned char CylinderHighByte;
		unsigned char DeviceHeadByte;
		unsigned char StatusByte;
		unsigned char Reserved[3];
	} read;

	struct {
		unsigned char SignatureByte0;
		unsigned char SignatureByte1;
		unsigned char ActionSelect;
		unsigned char RegisterSelect;
		unsigned char TransferBlockSize;
		unsigned char DeviceControlByte;
		unsigned char FeaturesByte;
		unsigned char SectorCountByte;
		unsigned char SectorNumberByte;
		unsigned char CylinderLowByte;
		unsigned char CylinderHighByte;
		unsigned char DeviceHeadByte;
		unsigned char CommandByte;
		unsigned char Reserved[3];
	} write;
};


/*
 * Inquiry data structure. This is the data returned from the target
 * after it receives an inquiry.
 *
 * This structure may be extended by the number of bytes specified
 * in the field AdditionalLength. The defined size constant only
 * includes fields through ProductRevisionLevel.
 */

/*
 * DeviceType field
 */
#define DIRECT_ACCESS_DEVICE	    0x00    /* disks */
#define DEVICE_REMOVABLE		0x80

struct inquiry_data {
   	unsigned char DeviceType;
	unsigned char DeviceTypeModifier;
	unsigned char Versions;
	unsigned char Format; 
	unsigned char AdditionalLength;
	unsigned char Reserved[2];
	unsigned char Capability;
	unsigned char VendorId[8];
	unsigned char ProductId[16];
	unsigned char ProductRevisionLevel[4];
	unsigned char VendorSpecific[20];
	unsigned char Reserved3[40];
} __attribute__ ((packed));

/*
 * INQUIRY data buffer size
 */

#define INQUIRYDATABUFFERSIZE 36


/*
 * ISD200 CONFIG data struct
 */

#define ATACFG_TIMING	  0x0f
#define ATACFG_ATAPI_RESET     0x10
#define ATACFG_MASTER	  0x20
#define ATACFG_BLOCKSIZE       0xa0

#define ATACFGE_LAST_LUN       0x07
#define ATACFGE_DESC_OVERRIDE  0x08
#define ATACFGE_STATE_SUSPEND  0x10
#define ATACFGE_SKIP_BOOT      0x20
#define ATACFGE_CONF_DESC2     0x40
#define ATACFGE_INIT_STATUS    0x80

#define CFG_CAPABILITY_SRST    0x01

struct isd200_config {
	unsigned char EventNotification;
	unsigned char ExternalClock;
	unsigned char ATAInitTimeout;
	unsigned char ATAConfig;
	unsigned char ATAMajorCommand;
	unsigned char ATAMinorCommand;
	unsigned char ATAExtraConfig;
	unsigned char Capability;
}__attribute__ ((packed));


/*
 * ISD200 driver information struct
 */

struct isd200_info {
	struct inquiry_data InquiryData;
	u16 *id;
	struct isd200_config ConfigData;
	unsigned char *RegsBuf;
	unsigned char ATARegs[8];
	unsigned char DeviceHead;
	unsigned char DeviceFlags;

	/* maximum number of LUNs supported */
	unsigned char MaxLUNs;
	unsigned char cmnd[BLK_MAX_CDB];
	struct scsi_cmnd srb;
	struct scatterlist sg;
};


/*
 * Read Capacity Data - returned in Big Endian format
 */

struct read_capacity_data {
	__be32 LogicalBlockAddress;
	__be32 BytesPerBlock;
};

/*
 * Read Block Limits Data - returned in Big Endian format
 * This structure returns the maximum and minimum block
 * size for a TAPE device.
 */

struct read_block_limits {
	unsigned char Reserved;
	unsigned char BlockMaximumSize[3];
	unsigned char BlockMinimumSize[2];
};


/*
 * Sense Data Format
 */

#define SENSE_ERRCODE	   0x7f
#define SENSE_ERRCODE_VALID     0x80
#define SENSE_FLAG_SENSE_KEY    0x0f
#define SENSE_FLAG_BAD_LENGTH   0x20
#define SENSE_FLAG_END_OF_MEDIA 0x40
#define SENSE_FLAG_FILE_MARK    0x80
struct sense_data {
	unsigned char ErrorCode;
	unsigned char SegmentNumber;
	unsigned char Flags;
	unsigned char Information[4];
	unsigned char AdditionalSenseLength;
	unsigned char CommandSpecificInformation[4];
	unsigned char AdditionalSenseCode;
	unsigned char AdditionalSenseCodeQualifier;
	unsigned char FieldReplaceableUnitCode;
	unsigned char SenseKeySpecific[3];
} __attribute__ ((packed));

/*
 * Default request sense buffer size
 */

#define SENSE_BUFFER_SIZE 18

/***********************************************************************
 * Helper routines
 ***********************************************************************/

/**************************************************************************
 * isd200_build_sense
 *									 
 *  Builds an artificial sense buffer to report the results of a 
 *  failed command.
 *								       
 * RETURNS:
 *    void
 */
static void isd200_build_sense(struct us_data *us, struct scsi_cmnd *srb)
{
	struct isd200_info *info = (struct isd200_info *)us->extra;
	struct sense_data *buf = (struct sense_data *) &srb->sense_buffer[0];
	unsigned char error = info->ATARegs[ATA_REG_ERROR_OFFSET];

	if(error & ATA_ERROR_MEDIA_CHANGE) {
		buf->ErrorCode = 0x70 | SENSE_ERRCODE_VALID;
		buf->AdditionalSenseLength = 0xb;
		buf->Flags = UNIT_ATTENTION;
		buf->AdditionalSenseCode = 0;
		buf->AdditionalSenseCodeQualifier = 0;
	} else if (error & ATA_MCR) {
		buf->ErrorCode = 0x70 | SENSE_ERRCODE_VALID;
		buf->AdditionalSenseLength = 0xb;
		buf->Flags =  UNIT_ATTENTION;
		buf->AdditionalSenseCode = 0;
		buf->AdditionalSenseCodeQualifier = 0;
	} else if (error & ATA_TRK0NF) {
		buf->ErrorCode = 0x70 | SENSE_ERRCODE_VALID;
		buf->AdditionalSenseLength = 0xb;
		buf->Flags =  NOT_READY;
		buf->AdditionalSenseCode = 0;
		buf->AdditionalSenseCodeQualifier = 0;
	} else if (error & ATA_UNC) {
		buf->ErrorCode = 0x70 | SENSE_ERRCODE_VALID;
		buf->AdditionalSenseLength = 0xb;
		buf->Flags =  DATA_PROTECT;
		buf->AdditionalSenseCode = 0;
		buf->AdditionalSenseCodeQualifier = 0;
	} else {
		buf->ErrorCode = 0;
		buf->AdditionalSenseLength = 0;
		buf->Flags =  0;
		buf->AdditionalSenseCode = 0;
		buf->AdditionalSenseCodeQualifier = 0;
	}
}


/***********************************************************************
 * Transport routines
 ***********************************************************************/

/**************************************************************************
 *  isd200_set_srb(), isd200_srb_set_bufflen()
 *
 * Two helpers to facilitate in initialization of scsi_cmnd structure
 * Will need to change when struct scsi_cmnd changes
 */
static void isd200_set_srb(struct isd200_info *info,
	enum dma_data_direction dir, void* buff, unsigned bufflen)
{
	struct scsi_cmnd *srb = &info->srb;

	if (buff)
		sg_init_one(&info->sg, buff, bufflen);

	srb->sc_data_direction = dir;
	srb->sdb.table.sgl = buff ? &info->sg : NULL;
	srb->sdb.length = bufflen;
	srb->sdb.table.nents = buff ? 1 : 0;
}

static void isd200_srb_set_bufflen(struct scsi_cmnd *srb, unsigned bufflen)
{
	srb->sdb.length = bufflen;
}


/**************************************************************************
 *  isd200_action
 *
 * Routine for sending commands to the isd200
 *
 * RETURNS:
 *    ISD status code
 */
static int isd200_action( struct us_data *us, int action, 
			  void* pointer, int value )
{
	union ata_cdb ata;
	/* static to prevent this large struct being placed on the valuable stack */
	static struct scsi_device srb_dev;
	struct isd200_info *info = (struct isd200_info *)us->extra;
	struct scsi_cmnd *srb = &info->srb;
	int status;

	memset(&ata, 0, sizeof(ata));
	srb->cmnd = info->cmnd;
	srb->device = &srb_dev;
	++srb->serial_number;

	ata.generic.SignatureByte0 = info->ConfigData.ATAMajorCommand;
	ata.generic.SignatureByte1 = info->ConfigData.ATAMinorCommand;
	ata.generic.TransferBlockSize = 1;

	switch ( action ) {
	case ACTION_READ_STATUS:
		US_DEBUGP("   isd200_action(READ_STATUS)\n");
		ata.generic.ActionSelect = ACTION_SELECT_0|ACTION_SELECT_2;
		ata.generic.RegisterSelect =
		  REG_CYLINDER_LOW | REG_CYLINDER_HIGH |
		  REG_STATUS | REG_ERROR;
		isd200_set_srb(info, DMA_FROM_DEVICE, pointer, value);
		break;

	case ACTION_ENUM:
		US_DEBUGP("   isd200_action(ENUM,0x%02x)\n",value);
		ata.generic.ActionSelect = ACTION_SELECT_1|ACTION_SELECT_2|
					   ACTION_SELECT_3|ACTION_SELECT_4|
					   ACTION_SELECT_5;
		ata.generic.RegisterSelect = REG_DEVICE_HEAD;
		ata.write.DeviceHeadByte = value;
		isd200_set_srb(info, DMA_NONE, NULL, 0);
		break;

	case ACTION_RESET:
		US_DEBUGP("   isd200_action(RESET)\n");
		ata.generic.ActionSelect = ACTION_SELECT_1|ACTION_SELECT_2|
					   ACTION_SELECT_3|ACTION_SELECT_4;
		ata.generic.RegisterSelect = REG_DEVICE_CONTROL;
		ata.write.DeviceControlByte = ATA_DC_RESET_CONTROLLER;
		isd200_set_srb(info, DMA_NONE, NULL, 0);
		break;

	case ACTION_REENABLE:
		US_DEBUGP("   isd200_action(REENABLE)\n");
		ata.generic.ActionSelect = ACTION_SELECT_1|ACTION_SELECT_2|
					   ACTION_SELECT_3|ACTION_SELECT_4;
		ata.generic.RegisterSelect = REG_DEVICE_CONTROL;
		ata.write.DeviceControlByte = ATA_DC_REENABLE_CONTROLLER;
		isd200_set_srb(info, DMA_NONE, NULL, 0);
		break;

	case ACTION_SOFT_RESET:
		US_DEBUGP("   isd200_action(SOFT_RESET)\n");
		ata.generic.ActionSelect = ACTION_SELECT_1|ACTION_SELECT_5;
		ata.generic.RegisterSelect = REG_DEVICE_HEAD | REG_COMMAND;
		ata.write.DeviceHeadByte = info->DeviceHead;
		ata.write.CommandByte = ATA_CMD_DEV_RESET;
		isd200_set_srb(info, DMA_NONE, NULL, 0);
		break;

	case ACTION_IDENTIFY:
		US_DEBUGP("   isd200_action(IDENTIFY)\n");
		ata.generic.RegisterSelect = REG_COMMAND;
		ata.write.CommandByte = ATA_CMD_ID_ATA;
		isd200_set_srb(info, DMA_FROM_DEVICE, info->id,
				ATA_ID_WORDS * 2);
		break;

	default:
		US_DEBUGP("Error: Undefined action %d\n",action);
		return ISD200_ERROR;
	}

	memcpy(srb->cmnd, &ata, sizeof(ata.generic));
	srb->cmd_len = sizeof(ata.generic);
	status = usb_stor_Bulk_transport(srb, us);
	if (status == USB_STOR_TRANSPORT_GOOD)
		status = ISD200_GOOD;
	else {
		US_DEBUGP("   isd200_action(0x%02x) error: %d\n",action,status);
		status = ISD200_ERROR;
		/* need to reset device here */
	}

	return status;
}

/**************************************************************************
 * isd200_read_regs
 *									 
 * Read ATA Registers
 *
 * RETURNS:
 *    ISD status code
 */
static int isd200_read_regs( struct us_data *us )
{
	struct isd200_info *info = (struct isd200_info *)us->extra;
	int retStatus = ISD200_GOOD;
	int transferStatus;

	US_DEBUGP("Entering isd200_IssueATAReadRegs\n");

	transferStatus = isd200_action( us, ACTION_READ_STATUS,
				    info->RegsBuf, sizeof(info->ATARegs) );
	if (transferStatus != ISD200_TRANSPORT_GOOD) {
		US_DEBUGP("   Error reading ATA registers\n");
		retStatus = ISD200_ERROR;
	} else {
		memcpy(info->ATARegs, info->RegsBuf, sizeof(info->ATARegs));
		US_DEBUGP("   Got ATA Register[ATA_REG_ERROR_OFFSET] = 0x%x\n",
			  info->ATARegs[ATA_REG_ERROR_OFFSET]);
	}

	return retStatus;
}


/**************************************************************************
 * Invoke the transport and basic error-handling/recovery methods
 *
 * This is used by the protocol layers to actually send the message to
 * the device and receive the response.
 */
static void isd200_invoke_transport( struct us_data *us, 
			      struct scsi_cmnd *srb, 
			      union ata_cdb *ataCdb )
{
	int need_auto_sense = 0;
	int transferStatus;
	int result;

	/* send the command to the transport layer */
	memcpy(srb->cmnd, ataCdb, sizeof(ataCdb->generic));
	srb->cmd_len = sizeof(ataCdb->generic);
	transferStatus = usb_stor_Bulk_transport(srb, us);

	/* if the command gets aborted by the higher layers, we need to
	 * short-circuit all other processing
	 */
	if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
		US_DEBUGP("-- command was aborted\n");
		goto Handle_Abort;
	}

	switch (transferStatus) {

	case USB_STOR_TRANSPORT_GOOD:
		/* Indicate a good result */
		srb->result = SAM_STAT_GOOD;
		break;

	case USB_STOR_TRANSPORT_NO_SENSE:
		US_DEBUGP("-- transport indicates protocol failure\n");
		srb->result = SAM_STAT_CHECK_CONDITION;
		return;

	case USB_STOR_TRANSPORT_FAILED:
		US_DEBUGP("-- transport indicates command failure\n");
		need_auto_sense = 1;
		break;

	case USB_STOR_TRANSPORT_ERROR:
		US_DEBUGP("-- transport indicates transport error\n");
		srb->result = DID_ERROR << 16;
		/* Need reset here */
		return;
    
	default:
		US_DEBUGP("-- transport indicates unknown error\n");   
		srb->result = DID_ERROR << 16;
		/* Need reset here */
		return;
	}

	if ((scsi_get_resid(srb) > 0) &&
	    !((srb->cmnd[0] == REQUEST_SENSE) ||
	      (srb->cmnd[0] == INQUIRY) ||
	      (srb->cmnd[0] == MODE_SENSE) ||
	      (srb->cmnd[0] == LOG_SENSE) ||
	      (srb->cmnd[0] == MODE_SENSE_10))) {
		US_DEBUGP("-- unexpectedly short transfer\n");
		need_auto_sense = 1;
	}

	if (need_auto_sense) {
		result = isd200_read_regs(us);
		if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
			US_DEBUGP("-- auto-sense aborted\n");
			goto Handle_Abort;
		}
		if (result == ISD200_GOOD) {
			isd200_build_sense(us, srb);
			srb->result = SAM_STAT_CHECK_CONDITION;

			/* If things are really okay, then let's show that */
			if ((srb->sense_buffer[2] & 0xf) == 0x0)
				srb->result = SAM_STAT_GOOD;
		} else {
			srb->result = DID_ERROR << 16;
			/* Need reset here */
		}
	}

	/* Regardless of auto-sense, if we _know_ we have an error
	 * condition, show that in the result code
	 */
	if (transferStatus == USB_STOR_TRANSPORT_FAILED)
		srb->result = SAM_STAT_CHECK_CONDITION;
	return;

	/* abort processing: the bulk-only transport requires a reset
	 * following an abort */
	Handle_Abort:
	srb->result = DID_ABORT << 16;

	/* permit the reset transfer to take place */
	clear_bit(US_FLIDX_ABORTING, &us->dflags);
	/* Need reset here */
}

#ifdef CONFIG_USB_STORAGE_DEBUG
static void isd200_log_config( struct isd200_info* info )
{
	US_DEBUGP("      Event Notification: 0x%x\n", 
		  info->ConfigData.EventNotification);
	US_DEBUGP("      External Clock: 0x%x\n", 
		  info->ConfigData.ExternalClock);
	US_DEBUGP("      ATA Init Timeout: 0x%x\n", 
		  info->ConfigData.ATAInitTimeout);
	US_DEBUGP("      ATAPI Command Block Size: 0x%x\n", 
		  (info->ConfigData.ATAConfig & ATACFG_BLOCKSIZE) >> 6);
	US_DEBUGP("      Master/Slave Selection: 0x%x\n", 
		  info->ConfigData.ATAConfig & ATACFG_MASTER);
	US_DEBUGP("      ATAPI Reset: 0x%x\n",
		  info->ConfigData.ATAConfig & ATACFG_ATAPI_RESET);
	US_DEBUGP("      ATA Timing: 0x%x\n",
		  info->ConfigData.ATAConfig & ATACFG_TIMING);
	US_DEBUGP("      ATA Major Command: 0x%x\n", 
		  info->ConfigData.ATAMajorCommand);
	US_DEBUGP("      ATA Minor Command: 0x%x\n", 
		  info->ConfigData.ATAMinorCommand);
	US_DEBUGP("      Init Status: 0x%x\n", 
		  info->ConfigData.ATAExtraConfig & ATACFGE_INIT_STATUS);
	US_DEBUGP("      Config Descriptor 2: 0x%x\n", 
		  info->ConfigData.ATAExtraConfig & ATACFGE_CONF_DESC2);
	US_DEBUGP("      Skip Device Boot: 0x%x\n",
		  info->ConfigData.ATAExtraConfig & ATACFGE_SKIP_BOOT);
	US_DEBUGP("      ATA 3 State Supsend: 0x%x\n",
		  info->ConfigData.ATAExtraConfig & ATACFGE_STATE_SUSPEND);
	US_DEBUGP("      Descriptor Override: 0x%x\n", 
		  info->ConfigData.ATAExtraConfig & ATACFGE_DESC_OVERRIDE);
	US_DEBUGP("      Last LUN Identifier: 0x%x\n",
		  info->ConfigData.ATAExtraConfig & ATACFGE_LAST_LUN);
	US_DEBUGP("      SRST Enable: 0x%x\n", 
		  info->ConfigData.ATAExtraConfig & CFG_CAPABILITY_SRST);
}
#endif

/**************************************************************************
 * isd200_write_config
 *									 
 * Write the ISD200 Configuration data
 *
 * RETURNS:
 *    ISD status code
 */
static int isd200_write_config( struct us_data *us ) 
{
	struct isd200_info *info = (struct isd200_info *)us->extra;
	int retStatus = ISD200_GOOD;
	int result;

#ifdef CONFIG_USB_STORAGE_DEBUG
	US_DEBUGP("Entering isd200_write_config\n");
	US_DEBUGP("   Writing the following ISD200 Config Data:\n");
	isd200_log_config(info);
#endif

	/* let's send the command via the control pipe */
	result = usb_stor_ctrl_transfer(
		us, 
		us->send_ctrl_pipe,
		0x01, 
		USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
		0x0000, 
		0x0002, 
		(void *) &info->ConfigData, 
		sizeof(info->ConfigData));

	if (result >= 0) {
		US_DEBUGP("   ISD200 Config Data was written successfully\n");
	} else {
		US_DEBUGP("   Request to write ISD200 Config Data failed!\n");
		retStatus = ISD200_ERROR;
	}

	US_DEBUGP("Leaving isd200_write_config %08X\n", retStatus);
	return retStatus;
}


/**************************************************************************
 * isd200_read_config
 *									 
 * Reads the ISD200 Configuration data
 *
 * RETURNS:
 *    ISD status code
 */
static int isd200_read_config( struct us_data *us ) 
{
	struct isd200_info *info = (struct isd200_info *)us->extra;
	int retStatus = ISD200_GOOD;
	int result;

	US_DEBUGP("Entering isd200_read_config\n");

	/* read the configuration information from ISD200.  Use this to */
	/* determine what the special ATA CDB bytes are.		*/

	result = usb_stor_ctrl_transfer(
		us, 
		us->recv_ctrl_pipe,
		0x02, 
		USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
		0x0000, 
		0x0002, 
		(void *) &info->ConfigData, 
		sizeof(info->ConfigData));


	if (result >= 0) {
		US_DEBUGP("   Retrieved the following ISD200 Config Data:\n");
#ifdef CONFIG_USB_STORAGE_DEBUG
		isd200_log_config(info);
#endif
	} else {
		US_DEBUGP("   Request to get ISD200 Config Data failed!\n");
		retStatus = ISD200_ERROR;
	}

	US_DEBUGP("Leaving isd200_read_config %08X\n", retStatus);
	return retStatus;
}


/**************************************************************************
 * isd200_atapi_soft_reset
 *									 
 * Perform an Atapi Soft Reset on the device
 *
 * RETURNS:
 *    NT status code
 */
static int isd200_atapi_soft_reset( struct us_data *us ) 
{
	int retStatus = ISD200_GOOD;
	int transferStatus;

	US_DEBUGP("Entering isd200_atapi_soft_reset\n");

	transferStatus = isd200_action( us, ACTION_SOFT_RESET, NULL, 0 );
	if (transferStatus != ISD200_TRANSPORT_GOOD) {
		US_DEBUGP("   Error issuing Atapi Soft Reset\n");
		retStatus = ISD200_ERROR;
	}

	US_DEBUGP("Leaving isd200_atapi_soft_reset %08X\n", retStatus);
	return retStatus;
}


/**************************************************************************
 * isd200_srst
 *									 
 * Perform an SRST on the device
 *
 * RETURNS:
 *    ISD status code
 */
static int isd200_srst( struct us_data *us ) 
{
	int retStatus = ISD200_GOOD;
	int transferStatus;

	US_DEBUGP("Entering isd200_SRST\n");

	transferStatus = isd200_action( us, ACTION_RESET, NULL, 0 );

	/* check to see if this request failed */
	if (transferStatus != ISD200_TRANSPORT_GOOD) {
		US_DEBUGP("   Error issuing SRST\n");
		retStatus = ISD200_ERROR;
	} else {
		/* delay 10ms to give the drive a chance to see it */
		msleep(10);

		transferStatus = isd200_action( us, ACTION_REENABLE, NULL, 0 );
		if (transferStatus != ISD200_TRANSPORT_GOOD) {
			US_DEBUGP("   Error taking drive out of reset\n");
			retStatus = ISD200_ERROR;
		} else {
			/* delay 50ms to give the drive a chance to recover after SRST */
			msleep(50);
		}
	}

	US_DEBUGP("Leaving isd200_srst %08X\n", retStatus);
	return retStatus;
}


/**************************************************************************
 * isd200_try_enum
 *									 
 * Helper function for isd200_manual_enum(). Does ENUM and READ_STATUS
 * and tries to analyze the status registers
 *
 * RETURNS:
 *    ISD status code
 */
static int isd200_try_enum(struct us_data *us, unsigned char master_slave,
			   int detect )
{
	int status = ISD200_GOOD;
	unsigned long endTime;
	struct isd200_info *info = (struct isd200_info *)us->extra;
	unsigned char *regs = info->RegsBuf;
	int recheckAsMaster = 0;

	if ( detect )
		endTime = jiffies + ISD200_ENUM_DETECT_TIMEOUT * HZ;
	else
		endTime = jiffies + ISD200_ENUM_BSY_TIMEOUT * HZ;

	/* loop until we detect !BSY or timeout */
	while(1) {
#ifdef CONFIG_USB_STORAGE_DEBUG
		char* mstr = master_slave == ATA_ADDRESS_DEVHEAD_STD ?
			"Master" : "Slave";
#endif

		status = isd200_action( us, ACTION_ENUM, NULL, master_slave );
		if ( status != ISD200_GOOD )
			break;

		status = isd200_action( us, ACTION_READ_STATUS, 
					regs, 8 );
		if ( status != ISD200_GOOD )
			break;

		if (!detect) {
			if (regs[ATA_REG_STATUS_OFFSET] & ATA_BUSY) {
				US_DEBUGP("   %s status is still BSY, try again...\n",mstr);
			} else {
				US_DEBUGP("   %s status !BSY, continue with next operation\n",mstr);
				break;
			}
		}
		/* check for ATA_BUSY and */
		/* ATA_DF (workaround ATA Zip drive) and */
		/* ATA_ERR (workaround for Archos CD-ROM) */
		else if (regs[ATA_REG_STATUS_OFFSET] &
			 (ATA_BUSY | ATA_DF | ATA_ERR)) {
			US_DEBUGP("   Status indicates it is not ready, try again...\n");
		}
		/* check for DRDY, ATA devices set DRDY after SRST */
		else if (regs[ATA_REG_STATUS_OFFSET] & ATA_DRDY) {
			US_DEBUGP("   Identified ATA device\n");
			info->DeviceFlags |= DF_ATA_DEVICE;
			info->DeviceHead = master_slave;
			break;
		} 
		/* check Cylinder High/Low to
		   determine if it is an ATAPI device
		*/
		else if (regs[ATA_REG_HCYL_OFFSET] == 0xEB &&
			 regs[ATA_REG_LCYL_OFFSET] == 0x14) {
			/* It seems that the RICOH 
			   MP6200A CD/RW drive will 
			   report itself okay as a
			   slave when it is really a
			   master. So this check again
			   as a master device just to
			   make sure it doesn't report
			   itself okay as a master also
			*/
			if ((master_slave & ATA_ADDRESS_DEVHEAD_SLAVE) &&
			    !recheckAsMaster) {
				US_DEBUGP("   Identified ATAPI device as slave.  Rechecking again as master\n");
				recheckAsMaster = 1;
				master_slave = ATA_ADDRESS_DEVHEAD_STD;
			} else {
				US_DEBUGP("   Identified ATAPI device\n");
				info->DeviceHead = master_slave;
			      
				status = isd200_atapi_soft_reset(us);
				break;
			}
		} else {
 			US_DEBUGP("   Not ATA, not ATAPI. Weird.\n");
			break;
		}

		/* check for timeout on this request */
		if (time_after_eq(jiffies, endTime)) {
			if (!detect)
				US_DEBUGP("   BSY check timeout, just continue with next operation...\n");
			else
				US_DEBUGP("   Device detect timeout!\n");
			break;
		}
	}

	return status;
}

/**************************************************************************
 * isd200_manual_enum
 *									 
 * Determines if the drive attached is an ATA or ATAPI and if it is a
 * master or slave.
 *
 * RETURNS:
 *    ISD status code
 */
static int isd200_manual_enum(struct us_data *us)
{
	struct isd200_info *info = (struct isd200_info *)us->extra;
	int retStatus = ISD200_GOOD;

	US_DEBUGP("Entering isd200_manual_enum\n");

	retStatus = isd200_read_config(us);
	if (retStatus == ISD200_GOOD) {
		int isslave;
		/* master or slave? */
		retStatus = isd200_try_enum( us, ATA_ADDRESS_DEVHEAD_STD, 0);
		if (retStatus == ISD200_GOOD)
			retStatus = isd200_try_enum( us, ATA_ADDRESS_DEVHEAD_SLAVE, 0);

		if (retStatus == ISD200_GOOD) {
			retStatus = isd200_srst(us);
			if (retStatus == ISD200_GOOD)
				/* ata or atapi? */
				retStatus = isd200_try_enum( us, ATA_ADDRESS_DEVHEAD_STD, 1);
		}

		isslave = (info->DeviceHead & ATA_ADDRESS_DEVHEAD_SLAVE) ? 1 : 0;
		if (!(info->ConfigData.ATAConfig & ATACFG_MASTER)) {
			US_DEBUGP("   Setting Master/Slave selection to %d\n", isslave);
			info->ConfigData.ATAConfig &= 0x3f;
			info->ConfigData.ATAConfig |= (isslave<<6);
			retStatus = isd200_write_config(us);
		}
	}

	US_DEBUGP("Leaving isd200_manual_enum %08X\n", retStatus);
	return(retStatus);
}

static void isd200_fix_driveid(u16 *id)
{
#ifndef __LITTLE_ENDIAN
# ifdef __BIG_ENDIAN
	int i;

	for (i = 0; i < ATA_ID_WORDS; i++)
		id[i] = __le16_to_cpu(id[i]);
# else
#  error "Please fix <asm/byteorder.h>"
# endif
#endif
}

static void isd200_dump_driveid(u16 *id)
{
	US_DEBUGP("   Identify Data Structure:\n");
	US_DEBUGP("      config = 0x%x\n",	  id[ATA_ID_CONFIG]);
	US_DEBUGP("      cyls = 0x%x\n",	  id[ATA_ID_CYLS]);
	US_DEBUGP("      heads = 0x%x\n",	  id[ATA_ID_HEADS]);
	US_DEBUGP("      track_bytes = 0x%x\n",	  id[4]);
	US_DEBUGP("      sector_bytes = 0x%x\n",  id[5]);
	US_DEBUGP("      sectors = 0x%x\n",	  id[ATA_ID_SECTORS]);
	US_DEBUGP("      serial_no[0] = 0x%x\n",  *(char *)&id[ATA_ID_SERNO]);
	US_DEBUGP("      buf_type = 0x%x\n",	  id[20]);
	US_DEBUGP("      buf_size = 0x%x\n",	  id[ATA_ID_BUF_SIZE]);
	US_DEBUGP("      ecc_bytes = 0x%x\n",	  id[22]);
	US_DEBUGP("      fw_rev[0] = 0x%x\n",	  *(char *)&id[ATA_ID_FW_REV]);
	US_DEBUGP("      model[0] = 0x%x\n",	  *(char *)&id[ATA_ID_PROD]);
	US_DEBUGP("      max_multsect = 0x%x\n",  id[ATA_ID_MAX_MULTSECT] & 0xff);
	US_DEBUGP("      dword_io = 0x%x\n",	  id[ATA_ID_DWORD_IO]);
	US_DEBUGP("      capability = 0x%x\n",	  id[ATA_ID_CAPABILITY] >> 8);
	US_DEBUGP("      tPIO = 0x%x\n",	  id[ATA_ID_OLD_PIO_MODES] >> 8);
	US_DEBUGP("      tDMA = 0x%x\n",	  id[ATA_ID_OLD_DMA_MODES] >> 8);
	US_DEBUGP("      field_valid = 0x%x\n",	  id[ATA_ID_FIELD_VALID]);
	US_DEBUGP("      cur_cyls = 0x%x\n",	  id[ATA_ID_CUR_CYLS]);
	US_DEBUGP("      cur_heads = 0x%x\n",	  id[ATA_ID_CUR_HEADS]);
	US_DEBUGP("      cur_sectors = 0x%x\n",	  id[ATA_ID_CUR_SECTORS]);
	US_DEBUGP("      cur_capacity = 0x%x\n",  ata_id_u32(id, 57));
	US_DEBUGP("      multsect = 0x%x\n",	  id[ATA_ID_MULTSECT] & 0xff);
	US_DEBUGP("      lba_capacity = 0x%x\n",  ata_id_u32(id, ATA_ID_LBA_CAPACITY));
	US_DEBUGP("      command_set_1 = 0x%x\n", id[ATA_ID_COMMAND_SET_1]);
	US_DEBUGP("      command_set_2 = 0x%x\n", id[ATA_ID_COMMAND_SET_2]);
}

/**************************************************************************
 * isd200_get_inquiry_data
 *
 * Get inquiry data
 *
 * RETURNS:
 *    ISD status code
 */
static int isd200_get_inquiry_data( struct us_data *us )
{
	struct isd200_info *info = (struct isd200_info *)us->extra;
	int retStatus = ISD200_GOOD;
	u16 *id = info->id;

	US_DEBUGP("Entering isd200_get_inquiry_data\n");

	/* set default to Master */
	info->DeviceHead = ATA_ADDRESS_DEVHEAD_STD;

	/* attempt to manually enumerate this device */
	retStatus = isd200_manual_enum(us);
	if (retStatus == ISD200_GOOD) {
		int transferStatus;

		/* check for an ATA device */
		if (info->DeviceFlags & DF_ATA_DEVICE) {
			/* this must be an ATA device */
			/* perform an ATA Command Identify */
			transferStatus = isd200_action( us, ACTION_IDENTIFY,
							id, ATA_ID_WORDS * 2);
			if (transferStatus != ISD200_TRANSPORT_GOOD) {
				/* Error issuing ATA Command Identify */
				US_DEBUGP("   Error issuing ATA Command Identify\n");
				retStatus = ISD200_ERROR;
			} else {
				/* ATA Command Identify successful */
				int i;
				__be16 *src;
				__u16 *dest;

				isd200_fix_driveid(id);
				isd200_dump_driveid(id);

				memset(&info->InquiryData, 0, sizeof(info->InquiryData));

				/* Standard IDE interface only supports disks */
				info->InquiryData.DeviceType = DIRECT_ACCESS_DEVICE;

				/* The length must be at least 36 (5 + 31) */
				info->InquiryData.AdditionalLength = 0x1F;

				if (id[ATA_ID_COMMAND_SET_1] & COMMANDSET_MEDIA_STATUS) {
					/* set the removable bit */
					info->InquiryData.DeviceTypeModifier = DEVICE_REMOVABLE;
					info->DeviceFlags |= DF_REMOVABLE_MEDIA;
				}

				/* Fill in vendor identification fields */
				src = (__be16 *)&id[ATA_ID_PROD];
				dest = (__u16*)info->InquiryData.VendorId;
				for (i=0;i<4;i++)
					dest[i] = be16_to_cpu(src[i]);

				src = (__be16 *)&id[ATA_ID_PROD + 8/2];
				dest = (__u16*)info->InquiryData.ProductId;
				for (i=0;i<8;i++)
					dest[i] = be16_to_cpu(src[i]);

				src = (__be16 *)&id[ATA_ID_FW_REV];
				dest = (__u16*)info->InquiryData.ProductRevisionLevel;
				for (i=0;i<2;i++)
					dest[i] = be16_to_cpu(src[i]);

				/* determine if it supports Media Status Notification */
				if (id[ATA_ID_COMMAND_SET_2] & COMMANDSET_MEDIA_STATUS) {
					US_DEBUGP("   Device supports Media Status Notification\n");

					/* Indicate that it is enabled, even though it is not
					 * This allows the lock/unlock of the media to work
					 * correctly.
					 */
					info->DeviceFlags |= DF_MEDIA_STATUS_ENABLED;
				}
				else
					info->DeviceFlags &= ~DF_MEDIA_STATUS_ENABLED;

			}
		} else {
			/* 
			 * this must be an ATAPI device 
			 * use an ATAPI protocol (Transparent SCSI)
			 */
			us->protocol_name = "Transparent SCSI";
			us->proto_handler = usb_stor_transparent_scsi_command;

			US_DEBUGP("Protocol changed to: %s\n", us->protocol_name);
	    
			/* Free driver structure */	    
			us->extra_destructor(info);
			kfree(info);
			us->extra = NULL;
			us->extra_destructor = NULL;
		}
	}

	US_DEBUGP("Leaving isd200_get_inquiry_data %08X\n", retStatus);

	return(retStatus);
}

/**************************************************************************
 * isd200_scsi_to_ata
 *									 
 * Translate SCSI commands to ATA commands.
 *
 * RETURNS:
 *    1 if the command needs to be sent to the transport layer
 *    0 otherwise
 */
static int isd200_scsi_to_ata(struct scsi_cmnd *srb, struct us_data *us,
			      union ata_cdb * ataCdb)
{
	struct isd200_info *info = (struct isd200_info *)us->extra;
	u16 *id = info->id;
	int sendToTransport = 1;
	unsigned char sectnum, head;
	unsigned short cylinder;
	unsigned long lba;
	unsigned long blockCount;
	unsigned char senseData[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };

	memset(ataCdb, 0, sizeof(union ata_cdb));

	/* SCSI Command */
	switch (srb->cmnd[0]) {
	case INQUIRY:
		US_DEBUGP("   ATA OUT - INQUIRY\n");

		/* copy InquiryData */
		usb_stor_set_xfer_buf((unsigned char *) &info->InquiryData,
				sizeof(info->InquiryData), srb);
		srb->result = SAM_STAT_GOOD;
		sendToTransport = 0;
		break;

	case MODE_SENSE:
		US_DEBUGP("   ATA OUT - SCSIOP_MODE_SENSE\n");

		/* Initialize the return buffer */
		usb_stor_set_xfer_buf(senseData, sizeof(senseData), srb);

		if (info->DeviceFlags & DF_MEDIA_STATUS_ENABLED)
		{
			ataCdb->generic.SignatureByte0 = info->ConfigData.ATAMajorCommand;
			ataCdb->generic.SignatureByte1 = info->ConfigData.ATAMinorCommand;
			ataCdb->generic.TransferBlockSize = 1;
			ataCdb->generic.RegisterSelect = REG_COMMAND;
			ataCdb->write.CommandByte = ATA_COMMAND_GET_MEDIA_STATUS;
			isd200_srb_set_bufflen(srb, 0);
		} else {
			US_DEBUGP("   Media Status not supported, just report okay\n");
			srb->result = SAM_STAT_GOOD;
			sendToTransport = 0;
		}
		break;

	case TEST_UNIT_READY:
		US_DEBUGP("   ATA OUT - SCSIOP_TEST_UNIT_READY\n");

		if (info->DeviceFlags & DF_MEDIA_STATUS_ENABLED)
		{
			ataCdb->generic.SignatureByte0 = info->ConfigData.ATAMajorCommand;
			ataCdb->generic.SignatureByte1 = info->ConfigData.ATAMinorCommand;
			ataCdb->generic.TransferBlockSize = 1;
			ataCdb->generic.RegisterSelect = REG_COMMAND;
			ataCdb->write.CommandByte = ATA_COMMAND_GET_MEDIA_STATUS;
			isd200_srb_set_bufflen(srb, 0);
		} else {
			US_DEBUGP("   Media Status not supported, just report okay\n");
			srb->result = SAM_STAT_GOOD;
			sendToTransport = 0;
		}
		break;

	case READ_CAPACITY:
	{
		unsigned long capacity;
		struct read_capacity_data readCapacityData;

		US_DEBUGP("   ATA OUT - SCSIOP_READ_CAPACITY\n");

		if (ata_id_has_lba(id))
			capacity = ata_id_u32(id, ATA_ID_LBA_CAPACITY) - 1;
		else
			capacity = (id[ATA_ID_HEADS] * id[ATA_ID_CYLS] *
				    id[ATA_ID_SECTORS]) - 1;

		readCapacityData.LogicalBlockAddress = cpu_to_be32(capacity);
		readCapacityData.BytesPerBlock = cpu_to_be32(0x200);

		usb_stor_set_xfer_buf((unsigned char *) &readCapacityData,
				sizeof(readCapacityData), srb);
		srb->result = SAM_STAT_GOOD;
		sendToTransport = 0;
	}
	break;

	case READ_10:
		US_DEBUGP("   ATA OUT - SCSIOP_READ\n");

		lba = be32_to_cpu(*(__be32 *)&srb->cmnd[2]);
		blockCount = (unsigned long)srb->cmnd[7]<<8 | (unsigned long)srb->cmnd[8];

		if (ata_id_has_lba(id)) {
			sectnum = (unsigned char)(lba);
			cylinder = (unsigned short)(lba>>8);
			head = ATA_ADDRESS_DEVHEAD_LBA_MODE | (unsigned char)(lba>>24 & 0x0F);
		} else {
			sectnum = (u8)((lba % id[ATA_ID_SECTORS]) + 1);
			cylinder = (u16)(lba / (id[ATA_ID_SECTORS] *
					id[ATA_ID_HEADS]));
			head = (u8)((lba / id[ATA_ID_SECTORS]) %
					id[ATA_ID_HEADS]);
		}
		ataCdb->generic.SignatureByte0 = info->ConfigData.ATAMajorCommand;
		ataCdb->generic.SignatureByte1 = info->ConfigData.ATAMinorCommand;
		ataCdb->generic.TransferBlockSize = 1;
		ataCdb->generic.RegisterSelect =
		  REG_SECTOR_COUNT | REG_SECTOR_NUMBER |
		  REG_CYLINDER_LOW | REG_CYLINDER_HIGH |
		  REG_DEVICE_HEAD  | REG_COMMAND;
		ataCdb->write.SectorCountByte = (unsigned char)blockCount;
		ataCdb->write.SectorNumberByte = sectnum;
		ataCdb->write.CylinderHighByte = (unsigned char)(cylinder>>8);
		ataCdb->write.CylinderLowByte = (unsigned char)cylinder;
		ataCdb->write.DeviceHeadByte = (head | ATA_ADDRESS_DEVHEAD_STD);
		ataCdb->write.CommandByte = ATA_CMD_PIO_READ;
		break;

	case WRITE_10:
		US_DEBUGP("   ATA OUT - SCSIOP_WRITE\n");

		lba = be32_to_cpu(*(__be32 *)&srb->cmnd[2]);
		blockCount = (unsigned long)srb->cmnd[7]<<8 | (unsigned long)srb->cmnd[8];

		if (ata_id_has_lba(id)) {
			sectnum = (unsigned char)(lba);
			cylinder = (unsigned short)(lba>>8);
			head = ATA_ADDRESS_DEVHEAD_LBA_MODE | (unsigned char)(lba>>24 & 0x0F);
		} else {
			sectnum = (u8)((lba % id[ATA_ID_SECTORS]) + 1);
			cylinder = (u16)(lba / (id[ATA_ID_SECTORS] *
					id[ATA_ID_HEADS]));
			head = (u8)((lba / id[ATA_ID_SECTORS]) %
					id[ATA_ID_HEADS]);
		}
		ataCdb->generic.SignatureByte0 = info->ConfigData.ATAMajorCommand;
		ataCdb->generic.SignatureByte1 = info->ConfigData.ATAMinorCommand;
		ataCdb->generic.TransferBlockSize = 1;
		ataCdb->generic.RegisterSelect =
		  REG_SECTOR_COUNT | REG_SECTOR_NUMBER |
		  REG_CYLINDER_LOW | REG_CYLINDER_HIGH |
		  REG_DEVICE_HEAD  | REG_COMMAND;
		ataCdb->write.SectorCountByte = (unsigned char)blockCount;
		ataCdb->write.SectorNumberByte = sectnum;
		ataCdb->write.CylinderHighByte = (unsigned char)(cylinder>>8);
		ataCdb->write.CylinderLowByte = (unsigned char)cylinder;
		ataCdb->write.DeviceHeadByte = (head | ATA_ADDRESS_DEVHEAD_STD);
		ataCdb->write.CommandByte = ATA_CMD_PIO_WRITE;
		break;

	case ALLOW_MEDIUM_REMOVAL:
		US_DEBUGP("   ATA OUT - SCSIOP_MEDIUM_REMOVAL\n");

		if (info->DeviceFlags & DF_REMOVABLE_MEDIA) {
			US_DEBUGP("   srb->cmnd[4] = 0x%X\n", srb->cmnd[4]);
	    
			ataCdb->generic.SignatureByte0 = info->ConfigData.ATAMajorCommand;
			ataCdb->generic.SignatureByte1 = info->ConfigData.ATAMinorCommand;
			ataCdb->generic.TransferBlockSize = 1;
			ataCdb->generic.RegisterSelect = REG_COMMAND;
			ataCdb->write.CommandByte = (srb->cmnd[4] & 0x1) ?
				ATA_CMD_MEDIA_LOCK : ATA_CMD_MEDIA_UNLOCK;
			isd200_srb_set_bufflen(srb, 0);
		} else {
			US_DEBUGP("   Not removeable media, just report okay\n");
			srb->result = SAM_STAT_GOOD;
			sendToTransport = 0;
		}
		break;

	case START_STOP:    
		US_DEBUGP("   ATA OUT - SCSIOP_START_STOP_UNIT\n");
		US_DEBUGP("   srb->cmnd[4] = 0x%X\n", srb->cmnd[4]);

		if ((srb->cmnd[4] & 0x3) == 0x2) {
			US_DEBUGP("   Media Eject\n");
			ataCdb->generic.SignatureByte0 = info->ConfigData.ATAMajorCommand;
			ataCdb->generic.SignatureByte1 = info->ConfigData.ATAMinorCommand;
			ataCdb->generic.TransferBlockSize = 0;
			ataCdb->generic.RegisterSelect = REG_COMMAND;
			ataCdb->write.CommandByte = ATA_COMMAND_MEDIA_EJECT;
		} else if ((srb->cmnd[4] & 0x3) == 0x1) {
			US_DEBUGP("   Get Media Status\n");
			ataCdb->generic.SignatureByte0 = info->ConfigData.ATAMajorCommand;
			ataCdb->generic.SignatureByte1 = info->ConfigData.ATAMinorCommand;
			ataCdb->generic.TransferBlockSize = 1;
			ataCdb->generic.RegisterSelect = REG_COMMAND;
			ataCdb->write.CommandByte = ATA_COMMAND_GET_MEDIA_STATUS;
			isd200_srb_set_bufflen(srb, 0);
		} else {
			US_DEBUGP("   Nothing to do, just report okay\n");
			srb->result = SAM_STAT_GOOD;
			sendToTransport = 0;
		}
		break;

	default:
		US_DEBUGP("Unsupported SCSI command - 0x%X\n", srb->cmnd[0]);
		srb->result = DID_ERROR << 16;
		sendToTransport = 0;
		break;
	}

	return(sendToTransport);
}


/**************************************************************************
 * isd200_free_info
 *
 * Frees the driver structure.
 */
static void isd200_free_info_ptrs(void *info_)
{
	struct isd200_info *info = (struct isd200_info *) info_;

	if (info) {
		kfree(info->id);
		kfree(info->RegsBuf);
		kfree(info->srb.sense_buffer);
	}
}

/**************************************************************************
 * isd200_init_info
 *									 
 * Allocates (if necessary) and initializes the driver structure.
 *
 * RETURNS:
 *    ISD status code
 */
static int isd200_init_info(struct us_data *us)
{
	int retStatus = ISD200_GOOD;
	struct isd200_info *info;

	info = (struct isd200_info *)
			kzalloc(sizeof(struct isd200_info), GFP_KERNEL);
	if (!info)
		retStatus = ISD200_ERROR;
	else {
		info->id = kzalloc(ATA_ID_WORDS * 2, GFP_KERNEL);
		info->RegsBuf = (unsigned char *)
				kmalloc(sizeof(info->ATARegs), GFP_KERNEL);
		info->srb.sense_buffer =
				kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_KERNEL);
		if (!info->id || !info->RegsBuf || !info->srb.sense_buffer) {
			isd200_free_info_ptrs(info);
			kfree(info);
			retStatus = ISD200_ERROR;
		}
	}

	if (retStatus == ISD200_GOOD) {
		us->extra = info;
		us->extra_destructor = isd200_free_info_ptrs;
	} else
		US_DEBUGP("ERROR - kmalloc failure\n");

	return retStatus;
}

/**************************************************************************
 * Initialization for the ISD200 
 */

static int isd200_Initialization(struct us_data *us)
{
	US_DEBUGP("ISD200 Initialization...\n");

	/* Initialize ISD200 info struct */

	if (isd200_init_info(us) == ISD200_ERROR) {
		US_DEBUGP("ERROR Initializing ISD200 Info struct\n");
	} else {
		/* Get device specific data */

		if (isd200_get_inquiry_data(us) != ISD200_GOOD)
			US_DEBUGP("ISD200 Initialization Failure\n");
		else
			US_DEBUGP("ISD200 Initialization complete\n");
	}

	return 0;
}


/**************************************************************************
 * Protocol and Transport for the ISD200 ASIC
 *
 * This protocol and transport are for ATA devices connected to an ISD200
 * ASIC.  An ATAPI device that is conected as a slave device will be
 * detected in the driver initialization function and the protocol will
 * be changed to an ATAPI protocol (Transparent SCSI).
 *
 */

static void isd200_ata_command(struct scsi_cmnd *srb, struct us_data *us)
{
	int sendToTransport = 1, orig_bufflen;
	union ata_cdb ataCdb;

	/* Make sure driver was initialized */

	if (us->extra == NULL)
		US_DEBUGP("ERROR Driver not initialized\n");

	scsi_set_resid(srb, 0);
	/* scsi_bufflen might change in protocol translation to ata */
	orig_bufflen = scsi_bufflen(srb);
	sendToTransport = isd200_scsi_to_ata(srb, us, &ataCdb);

	/* send the command to the transport layer */
	if (sendToTransport)
		isd200_invoke_transport(us, srb, &ataCdb);

	isd200_srb_set_bufflen(srb, orig_bufflen);
}

static int isd200_probe(struct usb_interface *intf,
			 const struct usb_device_id *id)
{
	struct us_data *us;
	int result;

	result = usb_stor_probe1(&us, intf, id,
			(id - isd200_usb_ids) + isd200_unusual_dev_list);
	if (result)
		return result;

	us->protocol_name = "ISD200 ATA/ATAPI";
	us->proto_handler = isd200_ata_command;

	result = usb_stor_probe2(us);
	return result;
}

static struct usb_driver isd200_driver = {
	.name =		"ums-isd200",
	.probe =	isd200_probe,
	.disconnect =	usb_stor_disconnect,
	.suspend =	usb_stor_suspend,
	.resume =	usb_stor_resume,
	.reset_resume =	usb_stor_reset_resume,
	.pre_reset =	usb_stor_pre_reset,
	.post_reset =	usb_stor_post_reset,
	.id_table =	isd200_usb_ids,
	.soft_unbind =	1,
};

static int __init isd200_init(void)
{
	return usb_register(&isd200_driver);
}

static void __exit isd200_exit(void)
{
	usb_deregister(&isd200_driver);
}

module_init(isd200_init);
module_exit(isd200_exit);