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

/*
 * Driver for Alauda-based card readers
 *
 * Current development and maintenance by:
 *   (c) 2005 Daniel Drake <dsd@gentoo.org>
 *
 * The 'Alauda' is a chip manufacturered by RATOC for OEM use.
 *
 * Alauda implements a vendor-specific command set to access two media reader
 * ports (XD, SmartMedia). This driver converts SCSI commands to the commands
 * which are accepted by these devices.
 *
 * The driver was developed through reverse-engineering, with the help of the
 * sddr09 driver which has many similarities, and with some help from the
 * (very old) vendor-supplied GPL sma03 driver.
 *
 * For protocol info, see http://alauda.sourceforge.net
 *
 * 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.
 */

#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 "alauda.h"

#define short_pack(lsb,msb) ( ((u16)(lsb)) | ( ((u16)(msb))<<8 ) )
#define LSB_of(s) ((s)&0xFF)
#define MSB_of(s) ((s)>>8)

#define MEDIA_PORT(us) us->srb->device->lun
#define MEDIA_INFO(us) ((struct alauda_info *)us->extra)->port[MEDIA_PORT(us)]

#define PBA_LO(pba) ((pba & 0xF) << 5)
#define PBA_HI(pba) (pba >> 3)
#define PBA_ZONE(pba) (pba >> 11)

/*
 * Media handling
 */

struct alauda_card_info {
	unsigned char id;		/* id byte */
	unsigned char chipshift;	/* 1<<cs bytes total capacity */
	unsigned char pageshift;	/* 1<<ps bytes in a page */
	unsigned char blockshift;	/* 1<<bs pages per block */
	unsigned char zoneshift;	/* 1<<zs blocks per zone */
};

static struct alauda_card_info alauda_card_ids[] = {
	/* NAND flash */
	{ 0x6e, 20, 8, 4, 8},	/* 1 MB */
	{ 0xe8, 20, 8, 4, 8},	/* 1 MB */
	{ 0xec, 20, 8, 4, 8},	/* 1 MB */
	{ 0x64, 21, 8, 4, 9}, 	/* 2 MB */
	{ 0xea, 21, 8, 4, 9},	/* 2 MB */
	{ 0x6b, 22, 9, 4, 9},	/* 4 MB */
	{ 0xe3, 22, 9, 4, 9},	/* 4 MB */
	{ 0xe5, 22, 9, 4, 9},	/* 4 MB */
	{ 0xe6, 23, 9, 4, 10},	/* 8 MB */
	{ 0x73, 24, 9, 5, 10},	/* 16 MB */
	{ 0x75, 25, 9, 5, 10},	/* 32 MB */
	{ 0x76, 26, 9, 5, 10},	/* 64 MB */
	{ 0x79, 27, 9, 5, 10},	/* 128 MB */
	{ 0x71, 28, 9, 5, 10},	/* 256 MB */

	/* MASK ROM */
	{ 0x5d, 21, 9, 4, 8},	/* 2 MB */
	{ 0xd5, 22, 9, 4, 9},	/* 4 MB */
	{ 0xd6, 23, 9, 4, 10},	/* 8 MB */
	{ 0x57, 24, 9, 4, 11},	/* 16 MB */
	{ 0x58, 25, 9, 4, 12},	/* 32 MB */
	{ 0,}
};

static struct alauda_card_info *alauda_card_find_id(unsigned char id) {
	int i;

	for (i = 0; alauda_card_ids[i].id != 0; i++)
		if (alauda_card_ids[i].id == id)
			return &(alauda_card_ids[i]);
	return NULL;
}

/*
 * ECC computation.
 */

static unsigned char parity[256];
static unsigned char ecc2[256];

static void nand_init_ecc(void) {
	int i, j, a;

	parity[0] = 0;
	for (i = 1; i < 256;