path: root/drivers/usb/storage/isd200.c

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


/* Include files */

#include <linux/jiffies.h>
#include <linux/errno.h>
#include <linux/slab.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"
#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 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 str