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isd200.c

/* Transport & Protocol Driver for In-System Design, Inc. ISD200 ASIC
 *
 * $Id: isd200.c,v 1.16 2002/04/22 03:39:43 mdharm Exp $
 *
 * 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/slab.h>
#include <linux/hdreg.h>
#include <linux/ide.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"
#include "isd200.h"


/* 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 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;
      struct hd_driveid *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;
      struct scsi_cmnd srb;
};


/*
 * 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[IDE_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 & MCR_ERR) {
            buf->ErrorCode = 0x70 | SENSE_ERRCODE_VALID;
            buf->AdditionalSenseLength = 0xb;
            buf->Flags =  UNIT_ATTENTION;
            buf->AdditionalSenseCode = 0;
            buf->AdditionalSenseCodeQualifier = 0;
      } else if(error & TRK0_ERR) {
            buf->ErrorCode = 0x70 | SENSE_ERRCODE_VALID;
            buf->AdditionalSenseLength = 0xb;
            buf->Flags =  NOT_READY;
            buf->AdditionalSenseCode = 0;
            buf->AdditionalSenseCodeQualifier = 0;
      } else if(error & ECC_ERR) {
            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_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;
      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));
      memset(&srb_dev, 0, sizeof(srb_dev));
      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;
            srb->sc_data_direction = DMA_FROM_DEVICE;
            srb->request_buffer = pointer;
            srb->request_bufflen = 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;
            srb->sc_data_direction = DMA_NONE;
            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;
            srb->sc_data_direction = DMA_NONE;
            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;
            srb->sc_data_direction = DMA_NONE;
            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 = WIN_SRST;
            srb->sc_data_direction = DMA_NONE;
            break;

      case ACTION_IDENTIFY:
            US_DEBUGP("   isd200_action(IDENTIFY)\n");
            ata.generic.RegisterSelect = REG_COMMAND;
            ata.write.CommandByte = WIN_IDENTIFY;
            srb->sc_data_direction = DMA_FROM_DEVICE;
            srb->request_buffer = (void *) info->id;
            srb->request_bufflen = sizeof(struct hd_driveid);
            break;

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

      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[IDE_ERROR_OFFSET] = 0x%x\n", 
                    info->ATARegs[IDE_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->flags)) {
            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 ((srb->resid > 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->flags)) {
                  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->flags);
      /* 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[IDE_STATUS_OFFSET] & BUSY_STAT ) {
                        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 BUSY_STAT and */
            /* WRERR_STAT (workaround ATA Zip drive) and */ 
            /* ERR_STAT (workaround for Archos CD-ROM) */
            else if (regs[IDE_STATUS_OFFSET] & 
                   (BUSY_STAT | WRERR_STAT | ERR_STAT )) {
                  US_DEBUGP("   Status indicates it is not ready, try again...\n");
            }
            /* check for DRDY, ATA devices set DRDY after SRST */
            else if (regs[IDE_STATUS_OFFSET] & READY_STAT) {
                  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[IDE_HCYL_OFFSET] == 0xEB) &&
                   (regs[IDE_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);
}

/*
 *    We are the last non IDE user of the legacy IDE ident structures
 *    and we thus want to keep a private copy of this function so the
 *    driver can be used without the obsolete drivers/ide layer
 */

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

      id->config         = __le16_to_cpu(id->config);
      id->cyls           = __le16_to_cpu(id->cyls);
      id->reserved2      = __le16_to_cpu(id->reserved2);
      id->heads          = __le16_to_cpu(id->heads);
      id->track_bytes    = __le16_to_cpu(id->track_bytes);
      id->sector_bytes   = __le16_to_cpu(id->sector_bytes);
      id->sectors        = __le16_to_cpu(id->sectors);
      id->vendor0        = __le16_to_cpu(id->vendor0);
      id->vendor1        = __le16_to_cpu(id->vendor1);
      id->vendor2        = __le16_to_cpu(id->vendor2);
      stringcast = (u16 *)&id->serial_no[0];
      for (i = 0; i < (20/2); i++)
            stringcast[i] = __le16_to_cpu(stringcast[i]);
      id->buf_type       = __le16_to_cpu(id->buf_type);
      id->buf_size       = __le16_to_cpu(id->buf_size);
      id->ecc_bytes      = __le16_to_cpu(id->ecc_bytes);
      stringcast = (u16 *)&id->fw_rev[0];
      for (i = 0; i < (8/2); i++)
            stringcast[i] = __le16_to_cpu(stringcast[i]);
      stringcast = (u16 *)&id->model[0];
      for (i = 0; i < (40/2); i++)
            stringcast[i] = __le16_to_cpu(stringcast[i]);
      id->dword_io       = __le16_to_cpu(id->dword_io);
      id->reserved50     = __le16_to_cpu(id->reserved50);
      id->field_valid    = __le16_to_cpu(id->field_valid);
      id->cur_cyls       = __le16_to_cpu(id->cur_cyls);
      id->cur_heads      = __le16_to_cpu(id->cur_heads);
      id->cur_sectors    = __le16_to_cpu(id->cur_sectors);
      id->cur_capacity0  = __le16_to_cpu(id->cur_capacity0);
      id->cur_capacity1  = __le16_to_cpu(id->cur_capacity1);
      id->lba_capacity   = __le32_to_cpu(id->lba_capacity);
      id->dma_1word      = __le16_to_cpu(id->dma_1word);
      id->dma_mword      = __le16_to_cpu(id->dma_mword);
      id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
      id->eide_dma_min   = __le16_to_cpu(id->eide_dma_min);
      id->eide_dma_time  = __le16_to_cpu(id->eide_dma_time);
      id->eide_pio       = __le16_to_cpu(id->eide_pio);
      id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
      for (i = 0; i < 2; ++i)
            id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
      for (i = 0; i < 4; ++i)
            id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
      id->queue_depth    = __le16_to_cpu(id->queue_depth);
      for (i = 0; i < 4; ++i)
            id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
      id->major_rev_num  = __le16_to_cpu(id->major_rev_num);
      id->minor_rev_num  = __le16_to_cpu(id->minor_rev_num);
      id->command_set_1  = __le16_to_cpu(id->command_set_1);
      id->command_set_2  = __le16_to_cpu(id->command_set_2);
      id->cfsse          = __le16_to_cpu(id->cfsse);
      id->cfs_enable_1   = __le16_to_cpu(id->cfs_enable_1);
      id->cfs_enable_2   = __le16_to_cpu(id->cfs_enable_2);
      id->csf_default    = __le16_to_cpu(id->csf_default);
      id->dma_ultra      = __le16_to_cpu(id->dma_ultra);
      id->trseuc         = __le16_to_cpu(id->trseuc);
      id->trsEuc         = __le16_to_cpu(id->trsEuc);
      id->CurAPMvalues   = __le16_to_cpu(id->CurAPMvalues);
      id->mprc           = __le16_to_cpu(id->mprc);
      id->hw_config      = __le16_to_cpu(id->hw_config);
      id->acoustic       = __le16_to_cpu(id->acoustic);
      id->msrqs          = __le16_to_cpu(id->msrqs);
      id->sxfert         = __le16_to_cpu(id->sxfert);
      id->sal            = __le16_to_cpu(id->sal);
      id->spg            = __le32_to_cpu(id->spg);
      id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
      for (i = 0; i < 22; i++)
            id->words104_125[i]   = __le16_to_cpu(id->words104_125[i]);
      id->last_lun       = __le16_to_cpu(id->last_lun);
      id->word127        = __le16_to_cpu(id->word127);
      id->dlf            = __le16_to_cpu(id->dlf);
      id->csfo           = __le16_to_cpu(id->csfo);
      for (i = 0; i < 26; i++)
            id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
      id->word156        = __le16_to_cpu(id->word156);
      for (i = 0; i < 3; i++)
            id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
      id->cfa_power      = __le16_to_cpu(id->cfa_power);
      for (i = 0; i < 14; i++)
            id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
      for (i = 0; i < 31; i++)
            id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
      for (i = 0; i < 48; i++)
            id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
      id->integrity_word  = __le16_to_cpu(id->integrity_word);
# else
#  error "Please fix <asm/byteorder.h>"
# endif
#endif
}


/**************************************************************************
 * 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;
      struct hd_driveid *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, 
                                          sizeof(struct hd_driveid) );
                  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);

                        US_DEBUGP("   Identify Data Structure:\n");
                        US_DEBUGP("      config = 0x%x\n", id->config);
                        US_DEBUGP("      cyls = 0x%x\n", id->cyls);
                        US_DEBUGP("      heads = 0x%x\n", id->heads);
                        US_DEBUGP("      track_bytes = 0x%x\n", id->track_bytes);
                        US_DEBUGP("      sector_bytes = 0x%x\n", id->sector_bytes);
                        US_DEBUGP("      sectors = 0x%x\n", id->sectors);
                        US_DEBUGP("      serial_no[0] = 0x%x\n", id->serial_no[0]);
                        US_DEBUGP("      buf_type = 0x%x\n", id->buf_type);
                        US_DEBUGP("      buf_size = 0x%x\n", id->buf_size);
                        US_DEBUGP("      ecc_bytes = 0x%x\n", id->ecc_bytes);
                        US_DEBUGP("      fw_rev[0] = 0x%x\n", id->fw_rev[0]);
                        US_DEBUGP("      model[0] = 0x%x\n", id->model[0]);
                        US_DEBUGP("      max_multsect = 0x%x\n", id->max_multsect);
                        US_DEBUGP("      dword_io = 0x%x\n", id->dword_io);
                        US_DEBUGP("      capability = 0x%x\n", id->capability);
                        US_DEBUGP("      tPIO = 0x%x\n", id->tPIO);
                        US_DEBUGP("      tDMA = 0x%x\n", id->tDMA);
                        US_DEBUGP("      field_valid = 0x%x\n", id->field_valid);
                        US_DEBUGP("      cur_cyls = 0x%x\n", id->cur_cyls);
                        US_DEBUGP("      cur_heads = 0x%x\n", id->cur_heads);
                        US_DEBUGP("      cur_sectors = 0x%x\n", id->cur_sectors);
                        US_DEBUGP("      cur_capacity = 0x%x\n", (id->cur_capacity1 << 16) + id->cur_capacity0 );
                        US_DEBUGP("      multsect = 0x%x\n", id->multsect);
                        US_DEBUGP("      lba_capacity = 0x%x\n", id->lba_capacity);
                        US_DEBUGP("      command_set_1 = 0x%x\n", id->command_set_1);
                        US_DEBUGP("      command_set_2 = 0x%x\n", id->command_set_2);

                        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->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->model;
                        dest = (__u16*)info->InquiryData.VendorId;
                        for (i=0;i<4;i++)
                              dest[i] = be16_to_cpu(src[i]);

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

                        src = (__be16*)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->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);
                  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;
      struct hd_driveid *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;
                  srb->request_bufflen = 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;
                  srb->request_bufflen = 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 (id->capability & CAPABILITY_LBA ) {
                  capacity = id->lba_capacity - 1;
            } else {
                  capacity = (id->heads *
                            id->cyls *
                            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 (id->capability & CAPABILITY_LBA) {
                  sectnum = (unsigned char)(lba);
                  cylinder = (unsigned short)(lba>>8);
                  head = ATA_ADDRESS_DEVHEAD_LBA_MODE | (unsigned char)(lba>>24 & 0x0F);
            } else {
                  sectnum = (unsigned char)((lba % id->sectors) + 1);
                  cylinder = (unsigned short)(lba / (id->sectors *
                                             id->heads));
                  head = (unsigned char)((lba / id->sectors) %
                                     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 = WIN_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 (id->capability & CAPABILITY_LBA) {
                  sectnum = (unsigned char)(lba);
                  cylinder = (unsigned short)(lba>>8);
                  head = ATA_ADDRESS_DEVHEAD_LBA_MODE | (unsigned char)(lba>>24 & 0x0F);
            } else {
                  sectnum = (unsigned char)((lba % id->sectors) + 1);
                  cylinder = (unsigned short)(lba / (id->sectors * id->heads));
                  head = (unsigned char)((lba / id->sectors) % 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 = WIN_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) ?
                        WIN_DOORLOCK : WIN_DOORUNLOCK;
                  srb->request_bufflen = 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;
                  srb->request_bufflen = 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);
      }
}

/**************************************************************************
 * 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 = (struct hd_driveid *)
                        kzalloc(sizeof(struct hd_driveid), GFP_KERNEL);
            info->RegsBuf = (unsigned char *)
                        kmalloc(sizeof(info->ATARegs), GFP_KERNEL);
            if (!info->id || !info->RegsBuf) {
                  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 
 */

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).
 *
 */

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

      /* Make sure driver was initialized */

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

      /* Convert command */
      srb->resid = 0;
      sendToTransport = isd200_scsi_to_ata(srb, us, &ataCdb);

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

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