isd200.c

自己根据lkd和情境分析

	if (need_auto_sense)
		if (isd200_read_regs(us) == ISD200_GOOD)
			isd200_build_sense(us, srb);

	/* Regardless of auto-sense, if we _know_ we have an error
	 * condition, show that in the result code
	 */
	if (transferStatus == ISD200_TRANSPORT_FAILED)
		srb->result = CHECK_CONDITION;
}


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


	US_DEBUGP("Entering isd200_write_config\n");

	US_DEBUGP("   Writing the following ISD200 Config Data:\n");
	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.ATAPICommandBlockSize);
	US_DEBUGP("      Master/Slave Selection: 0x%x\n", info->ConfigData.MasterSlaveSelection);
	US_DEBUGP("      ATAPI Reset: 0x%x\n", info->ConfigData.ATAPIReset);
	US_DEBUGP("      ATA Timing: 0x%x\n", info->ConfigData.ATATiming);
	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.InitStatus);
	US_DEBUGP("      Config Descriptor 2: 0x%x\n", info->ConfigData.ConfigDescriptor2);
	US_DEBUGP("      Skip Device Boot: 0x%x\n", info->ConfigData.SkipDeviceBoot);
	US_DEBUGP("      ATA 3 State Supsend: 0x%x\n", info->ConfigData.ATA3StateSuspend);
	US_DEBUGP("      Descriptor Override: 0x%x\n", info->ConfigData.DescriptOverride);
	US_DEBUGP("      Last LUN Identifier: 0x%x\n", info->ConfigData.LastLUNIdentifier);
	US_DEBUGP("      SRST Enable: 0x%x\n", info->ConfigData.SRSTEnable);

	/* let's send the command via the control pipe */
	result = usb_stor_control_msg(
                us, 
                usb_sndctrlpipe(us->pusb_dev,0),
                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");

		/* STALL must be cleared when they are detected */
		if (result == -EPIPE) {
			US_DEBUGP("-- Stall on control pipe. Clearing\n");
			result = usb_stor_clear_halt(us->pusb_dev,
						     usb_sndctrlpipe(us->pusb_dev, 0));
			US_DEBUGP("-- usb_stor_clear_halt() returns %d\n", result);

		}
		retStatus = ISD200_ERROR;
        }

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


/**************************************************************************
 * isd200_read_config
 *                                                                         
 * Reads the ISD200 Configuraton data
 *
 * RETURNS:
 *    ISD status code
 */                                                                        
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_control_msg(
                us, 
                usb_rcvctrlpipe(us->pusb_dev,0),
                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");
		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.ATAPICommandBlockSize);
		US_DEBUGP("      Master/Slave Selection: 0x%x\n", info->ConfigData.MasterSlaveSelection);
		US_DEBUGP("      ATAPI Reset: 0x%x\n", info->ConfigData.ATAPIReset);
		US_DEBUGP("      ATA Timing: 0x%x\n", info->ConfigData.ATATiming);
		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.InitStatus);
		US_DEBUGP("      Config Descriptor 2: 0x%x\n", info->ConfigData.ConfigDescriptor2);
		US_DEBUGP("      Skip Device Boot: 0x%x\n", info->ConfigData.SkipDeviceBoot);
		US_DEBUGP("      ATA 3 State Supsend: 0x%x\n", info->ConfigData.ATA3StateSuspend);
		US_DEBUGP("      Descriptor Override: 0x%x\n", info->ConfigData.DescriptOverride);
		US_DEBUGP("      Last LUN Identifier: 0x%x\n", info->ConfigData.LastLUNIdentifier);
		US_DEBUGP("      SRST Enable: 0x%x\n", info->ConfigData.SRSTEnable);
        } else {
		US_DEBUGP("   Request to get ISD200 Config Data failed!\n");

		/* STALL must be cleared when they are detected */
		if (result == -EPIPE) {
			US_DEBUGP("-- Stall on control pipe. Clearing\n");
			result = usb_stor_clear_halt(us->pusb_dev,   
						     usb_sndctrlpipe(us->pusb_dev, 0));
			US_DEBUGP("-- usb_stor_clear_halt() returns %d\n", result);

		}
		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
 */                                                                        
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
 */                                                                        
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 */
		wait_ms(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 */
			wait_ms(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 char regs[8];
	unsigned long endTime;
	struct isd200_info *info = (struct isd200_info *)us->extra;
	int recheckAsMaster = FALSE;

	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(TRUE) {
#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, sizeof(regs) );
		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 == FALSE)) {
				US_DEBUGP("   Identified ATAPI device as slave.  Rechecking again as master\n");
				recheckAsMaster = TRUE;
				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");
		}

		/* check for timeout on this request */
		if (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
 */                                                                        
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, FALSE );
		if (retStatus == ISD200_GOOD)
			retStatus = isd200_try_enum( us, ATA_ADDRESS_DEVHEAD_SLAVE, FALSE );

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

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

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


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

	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 Commmand Identify */
			transferStatus = isd200_action( us, ACTION_IDENTIFY,
							&info->drive, 
							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;

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

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

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

				/* Fix-up the return data from an INQUIRY command to show 
				 * ANSI SCSI rev 2 so we don't confuse the SCSI layers above us
				 * in Linux.
				 */
				info->InquiryData.Versions = 0x2;