/* 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 = 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);