ide-floppy.c 37.2 KB
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/*
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 * IDE ATAPI floppy driver.
 *
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 * Copyright (C) 1996-1999  Gadi Oxman <gadio@netvision.net.il>
 * Copyright (C) 2000-2002  Paul Bristow <paul@paulbristow.net>
 * Copyright (C) 2005       Bartlomiej Zolnierkiewicz
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 *
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 * This driver supports the following IDE floppy drives:
 *
 * LS-120/240 SuperDisk
 * Iomega Zip 100/250
 * Iomega PC Card Clik!/PocketZip
 *
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 * For a historical changelog see
 * Documentation/ide/ChangeLog.ide-floppy.1996-2002
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 */

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#define DRV_NAME "ide-floppy"

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#define IDEFLOPPY_VERSION "1.00"
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#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/slab.h>
#include <linux/cdrom.h>
#include <linux/ide.h>
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#include <linux/hdreg.h>
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#include <linux/bitops.h>
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#include <linux/mutex.h>
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#include <scsi/scsi_ioctl.h>

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#include <asm/byteorder.h>
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#include <linux/irq.h>
#include <linux/uaccess.h>
#include <linux/io.h>
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#include <asm/unaligned.h>

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/* define to see debug info */
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#define IDEFLOPPY_DEBUG_LOG		0

/* #define IDEFLOPPY_DEBUG(fmt, args...) printk(KERN_INFO fmt, ## args) */
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#define IDEFLOPPY_DEBUG(fmt, args...)
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#if IDEFLOPPY_DEBUG_LOG
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#define debug_log(fmt, args...) \
	printk(KERN_INFO "ide-floppy: " fmt, ## args)
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#else
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#define debug_log(fmt, args...) do {} while (0)
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#endif


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/* Some drives require a longer irq timeout. */
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#define IDEFLOPPY_WAIT_CMD		(5 * WAIT_CMD)

/*
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 * After each failed packet command we issue a request sense command and retry
 * the packet command IDEFLOPPY_MAX_PC_RETRIES times.
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 */
#define IDEFLOPPY_MAX_PC_RETRIES	3

/*
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 * With each packet command, we allocate a buffer of IDEFLOPPY_PC_BUFFER_SIZE
 * bytes.
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 */
#define IDEFLOPPY_PC_BUFFER_SIZE	256

/*
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 * In various places in the driver, we need to allocate storage for packet
 * commands and requests, which will remain valid while	we leave the driver to
 * wait for an interrupt or a timeout event.
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 */
#define IDEFLOPPY_PC_STACK		(10 + IDEFLOPPY_MAX_PC_RETRIES)

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/* format capacities descriptor codes */
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#define CAPACITY_INVALID	0x00
#define CAPACITY_UNFORMATTED	0x01
#define CAPACITY_CURRENT	0x02
#define CAPACITY_NO_CARTRIDGE	0x03

/*
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 * Most of our global data which we need to save even as we leave the driver
 * due to an interrupt or a timer event is stored in a variable of type
 * idefloppy_floppy_t, defined below.
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 */
typedef struct ide_floppy_obj {
	ide_drive_t	*drive;
	ide_driver_t	*driver;
	struct gendisk	*disk;
	struct kref	kref;
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	unsigned int	openers;	/* protected by BKL for now */
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	/* Current packet command */
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	struct ide_atapi_pc *pc;
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	/* Last failed packet command */
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	struct ide_atapi_pc *failed_pc;
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	/* Packet command stack */
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	struct ide_atapi_pc pc_stack[IDEFLOPPY_PC_STACK];
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	/* Next free packet command storage space */
	int pc_stack_index;
	struct request rq_stack[IDEFLOPPY_PC_STACK];
	/* We implement a circular array */
	int rq_stack_index;

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	/* Last error information */
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	u8 sense_key, asc, ascq;
	/* delay this long before sending packet command */
	u8 ticks;
	int progress_indication;

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	/* Device information */
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	/* Current format */
	int blocks, block_size, bs_factor;
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	/* Last format capacity descriptor */
	u8 cap_desc[8];
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	/* Copy of the flexible disk page */
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	u8 flexible_disk_page[32];
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	/* Write protect */
	int wp;
	/* Supports format progress report */
	int srfp;
} idefloppy_floppy_t;

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#define IDEFLOPPY_TICKS_DELAY	HZ/20	/* default delay for ZIP 100 (50ms) */
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/* Defines for the MODE SENSE command */
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#define MODE_SENSE_CURRENT		0x00
#define MODE_SENSE_CHANGEABLE		0x01
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#define MODE_SENSE_DEFAULT		0x02
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#define MODE_SENSE_SAVED		0x03

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/* IOCTLs used in low-level formatting. */
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#define	IDEFLOPPY_IOCTL_FORMAT_SUPPORTED	0x4600
#define	IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY	0x4601
#define	IDEFLOPPY_IOCTL_FORMAT_START		0x4602
#define IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS	0x4603

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/* Error code returned in rq->errors to the higher part of the driver. */
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#define	IDEFLOPPY_ERROR_GENERAL		101

/*
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 * Pages of the SELECT SENSE / MODE SENSE packet commands.
 * See SFF-8070i spec.
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 */
#define	IDEFLOPPY_CAPABILITIES_PAGE	0x1b
#define IDEFLOPPY_FLEXIBLE_DISK_PAGE	0x05

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static DEFINE_MUTEX(idefloppy_ref_mutex);
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#define to_ide_floppy(obj) container_of(obj, struct ide_floppy_obj, kref)

#define ide_floppy_g(disk) \
	container_of((disk)->private_data, struct ide_floppy_obj, driver)

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static void idefloppy_cleanup_obj(struct kref *);

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static struct ide_floppy_obj *ide_floppy_get(struct gendisk *disk)
{
	struct ide_floppy_obj *floppy = NULL;

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	mutex_lock(&idefloppy_ref_mutex);
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	floppy = ide_floppy_g(disk);
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	if (floppy) {
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		if (ide_device_get(floppy->drive))
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			floppy = NULL;
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		else
			kref_get(&floppy->kref);
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	}
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	mutex_unlock(&idefloppy_ref_mutex);
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	return floppy;
}

static void ide_floppy_put(struct ide_floppy_obj *floppy)
{
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	ide_drive_t *drive = floppy->drive;

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	mutex_lock(&idefloppy_ref_mutex);
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	kref_put(&floppy->kref, idefloppy_cleanup_obj);
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	ide_device_put(drive);
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	mutex_unlock(&idefloppy_ref_mutex);
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}

/*
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 * Used to finish servicing a request. For read/write requests, we will call
 * ide_end_request to pass to the next buffer.
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 */
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static int idefloppy_end_request(ide_drive_t *drive, int uptodate, int nsecs)
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{
	idefloppy_floppy_t *floppy = drive->driver_data;
	struct request *rq = HWGROUP(drive)->rq;
	int error;

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	debug_log("Reached %s\n", __func__);
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	switch (uptodate) {
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	case 0: error = IDEFLOPPY_ERROR_GENERAL; break;
	case 1: error = 0; break;
	default: error = uptodate;
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	}
	if (error)
		floppy->failed_pc = NULL;
	/* Why does this happen? */
	if (!rq)
		return 0;
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	if (!blk_special_request(rq)) {
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		/* our real local end request function */
		ide_end_request(drive, uptodate, nsecs);
		return 0;
	}
	rq->errors = error;
	/* fixme: need to move this local also */
	ide_end_drive_cmd(drive, 0, 0);
	return 0;
}

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static void ide_floppy_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
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				  unsigned int bcount, int direction)
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{
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	ide_hwif_t *hwif = drive->hwif;
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	struct request *rq = pc->rq;
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	struct req_iterator iter;
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	struct bio_vec *bvec;
	unsigned long flags;
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	int count, done = 0;
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	char *data;

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	rq_for_each_segment(bvec, rq, iter) {
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		if (!bcount)
			break;
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		count = min(bvec->bv_len, bcount);
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		data = bvec_kmap_irq(bvec, &flags);
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		if (direction)
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			hwif->tp_ops->output_data(drive, NULL, data, count);
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		else
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			hwif->tp_ops->input_data(drive, NULL, data, count);
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		bvec_kunmap_irq(data, &flags);
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		bcount -= count;
		pc->b_count += count;
		done += count;
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	}

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	idefloppy_end_request(drive, 1, done >> 9);
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	if (bcount) {
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		printk(KERN_ERR "%s: leftover data in %s, bcount == %d\n",
				drive->name, __func__, bcount);
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		ide_pad_transfer(drive, direction, bcount);
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	}
}

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static void idefloppy_update_buffers(ide_drive_t *drive,
				struct ide_atapi_pc *pc)
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{
	struct request *rq = pc->rq;
	struct bio *bio = rq->bio;

	while ((bio = rq->bio) != NULL)
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		idefloppy_end_request(drive, 1, 0);
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}

/*
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 * Generate a new packet command request in front of the request queue, before
 * the current request so that it will be processed immediately, on the next
 * pass through the driver.
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 */
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static void idefloppy_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc,
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		struct request *rq)
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{
	struct ide_floppy_obj *floppy = drive->driver_data;

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	blk_rq_init(NULL, rq);
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	rq->buffer = (char *) pc;
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	rq->cmd_type = REQ_TYPE_SPECIAL;
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	rq->cmd_flags |= REQ_PREEMPT;
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	rq->rq_disk = floppy->disk;
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	memcpy(rq->cmd, pc->c, 12);
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	ide_do_drive_cmd(drive, rq);
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}

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static struct ide_atapi_pc *idefloppy_next_pc_storage(ide_drive_t *drive)
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{
	idefloppy_floppy_t *floppy = drive->driver_data;

	if (floppy->pc_stack_index == IDEFLOPPY_PC_STACK)
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		floppy->pc_stack_index = 0;
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	return (&floppy->pc_stack[floppy->pc_stack_index++]);
}

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static struct request *idefloppy_next_rq_storage(ide_drive_t *drive)
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{
	idefloppy_floppy_t *floppy = drive->driver_data;

	if (floppy->rq_stack_index == IDEFLOPPY_PC_STACK)
		floppy->rq_stack_index = 0;
	return (&floppy->rq_stack[floppy->rq_stack_index++]);
}

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static void ide_floppy_callback(ide_drive_t *drive)
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{
	idefloppy_floppy_t *floppy = drive->driver_data;
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	struct ide_atapi_pc *pc = floppy->pc;
	int uptodate = pc->error ? 0 : 1;
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	debug_log("Reached %s\n", __func__);

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	if (floppy->failed_pc == pc)
		floppy->failed_pc = NULL;

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	if (pc->c[0] == GPCMD_READ_10 || pc->c[0] == GPCMD_WRITE_10 ||
	    (pc->rq && blk_pc_request(pc->rq)))
		uptodate = 1; /* FIXME */
	else if (pc->c[0] == GPCMD_REQUEST_SENSE) {
		u8 *buf = floppy->pc->buf;
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		if (!pc->error) {
			floppy->sense_key = buf[2] & 0x0F;
			floppy->asc = buf[12];
			floppy->ascq = buf[13];
			floppy->progress_indication = buf[15] & 0x80 ?
				(u16)get_unaligned((u16 *)&buf[16]) : 0x10000;
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			if (floppy->failed_pc)
				debug_log("pc = %x, ", floppy->failed_pc->c[0]);
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			debug_log("sense key = %x, asc = %x, ascq = %x\n",
				  floppy->sense_key, floppy->asc, floppy->ascq);
		} else
			printk(KERN_ERR "Error in REQUEST SENSE itself - "
					"Aborting request!\n");
	}
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	idefloppy_end_request(drive, uptodate, 0);
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}

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static void idefloppy_init_pc(struct ide_atapi_pc *pc)
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{
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	memset(pc, 0, sizeof(*pc));
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	pc->buf = pc->pc_buf;
	pc->buf_size = IDEFLOPPY_PC_BUFFER_SIZE;
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}

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static void idefloppy_create_request_sense_cmd(struct ide_atapi_pc *pc)
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{
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	idefloppy_init_pc(pc);
	pc->c[0] = GPCMD_REQUEST_SENSE;
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	pc->c[4] = 255;
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	pc->req_xfer = 18;
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}

/*
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 * Called when an error was detected during the last packet command. We queue a
 * request sense packet command in the head of the request list.
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 */
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static void idefloppy_retry_pc(ide_drive_t *drive)
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{
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	struct ide_atapi_pc *pc;
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	struct request *rq;

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	(void)ide_read_error(drive);
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	pc = idefloppy_next_pc_storage(drive);
	rq = idefloppy_next_rq_storage(drive);
	idefloppy_create_request_sense_cmd(pc);
	idefloppy_queue_pc_head(drive, pc, rq);
}

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/* The usual interrupt handler called during a packet command. */
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static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
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{
	idefloppy_floppy_t *floppy = drive->driver_data;

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	return ide_pc_intr(drive, floppy->pc, idefloppy_pc_intr,
			   IDEFLOPPY_WAIT_CMD, NULL, idefloppy_update_buffers,
			   idefloppy_retry_pc, NULL, ide_floppy_io_buffers);
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}

/*
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 * What we have here is a classic case of a top half / bottom half interrupt
 * service routine. In interrupt mode, the device sends an interrupt to signal
 * that it is ready to receive a packet. However, we need to delay about 2-3
 * ticks before issuing the packet or we gets in trouble.
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 */
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static int idefloppy_transfer_pc(ide_drive_t *drive)
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{
	idefloppy_floppy_t *floppy = drive->driver_data;

	/* Send the actual packet */
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	drive->hwif->tp_ops->output_data(drive, NULL, floppy->pc->c, 12);
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	/* Timeout for the packet command */
	return IDEFLOPPY_WAIT_CMD;
}

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/*
 * Called as an interrupt (or directly). When the device says it's ready for a
 * packet, we schedule the packet transfer to occur about 2-3 ticks later in
 * transfer_pc.
 */
static ide_startstop_t idefloppy_start_pc_transfer(ide_drive_t *drive)
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{
	idefloppy_floppy_t *floppy = drive->driver_data;
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	struct ide_atapi_pc *pc = floppy->pc;
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	ide_expiry_t *expiry;
	unsigned int timeout;
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	/*
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	 * The following delay solves a problem with ATAPI Zip 100 drives
	 * where the Busy flag was apparently being deasserted before the
	 * unit was ready to receive data. This was happening on a
	 * 1200 MHz Athlon system. 10/26/01 25msec is too short,
	 * 40 and 50msec work well. idefloppy_pc_intr will not be actually
	 * used until after the packet is moved in about 50 msec.
	 */
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	if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
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		timeout = floppy->ticks;
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		expiry = &idefloppy_transfer_pc;
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	} else {
		timeout = IDEFLOPPY_WAIT_CMD;
		expiry = NULL;
	}

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	return ide_transfer_pc(drive, pc, idefloppy_pc_intr, timeout, expiry);
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}

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static void ide_floppy_report_error(idefloppy_floppy_t *floppy,
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				    struct ide_atapi_pc *pc)
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{
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	/* supress error messages resulting from Medium not present */
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	if (floppy->sense_key == 0x02 &&
	    floppy->asc       == 0x3a &&
	    floppy->ascq      == 0x00)
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		return;

	printk(KERN_ERR "ide-floppy: %s: I/O error, pc = %2x, key = %2x, "
			"asc = %2x, ascq = %2x\n",
			floppy->drive->name, pc->c[0], floppy->sense_key,
			floppy->asc, floppy->ascq);

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}

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static ide_startstop_t idefloppy_issue_pc(ide_drive_t *drive,
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		struct ide_atapi_pc *pc)
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{
	idefloppy_floppy_t *floppy = drive->driver_data;

	if (floppy->failed_pc == NULL &&
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	    pc->c[0] != GPCMD_REQUEST_SENSE)
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		floppy->failed_pc = pc;
	/* Set the current packet command */
	floppy->pc = pc;

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	if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES) {
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		if (!(pc->flags & PC_FLAG_SUPPRESS_ERROR))
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			ide_floppy_report_error(floppy, pc);
		/* Giving up */
		pc->error = IDEFLOPPY_ERROR_GENERAL;

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		floppy->failed_pc = NULL;
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		drive->pc_callback(drive);
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		return ide_stopped;
	}

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	debug_log("Retry number - %d\n", pc->retries);
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	pc->retries++;

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	return ide_issue_pc(drive, pc, idefloppy_start_pc_transfer,
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			    IDEFLOPPY_WAIT_CMD, NULL);
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}

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static void idefloppy_create_prevent_cmd(struct ide_atapi_pc *pc, int prevent)
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{
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	debug_log("creating prevent removal command, prevent = %d\n", prevent);
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	idefloppy_init_pc(pc);
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	pc->c[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
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	pc->c[4] = prevent;
}

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static void idefloppy_create_read_capacity_cmd(struct ide_atapi_pc *pc)
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{
	idefloppy_init_pc(pc);
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	pc->c[0] = GPCMD_READ_FORMAT_CAPACITIES;
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	pc->c[7] = 255;
	pc->c[8] = 255;
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	pc->req_xfer = 255;
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}

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static void idefloppy_create_format_unit_cmd(struct ide_atapi_pc *pc, int b,
		int l, int flags)
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{
	idefloppy_init_pc(pc);
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	pc->c[0] = GPCMD_FORMAT_UNIT;
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	pc->c[1] = 0x17;

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	memset(pc->buf, 0, 12);
	pc->buf[1] = 0xA2;
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	/* Default format list header, u8 1: FOV/DCRT/IMM bits set */

	if (flags & 1)				/* Verify bit on... */
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		pc->buf[1] ^= 0x20;		/* ... turn off DCRT bit */
	pc->buf[3] = 8;
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	put_unaligned(cpu_to_be32(b), (unsigned int *)(&pc->buf[4]));
	put_unaligned(cpu_to_be32(l), (unsigned int *)(&pc->buf[8]));
	pc->buf_size = 12;
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	pc->flags |= PC_FLAG_WRITING;
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}

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/* A mode sense command is used to "sense" floppy parameters. */
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static void idefloppy_create_mode_sense_cmd(struct ide_atapi_pc *pc,
		u8 page_code, u8 type)
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{
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	u16 length = 8; /* sizeof(Mode Parameter Header) = 8 Bytes */
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	idefloppy_init_pc(pc);
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	pc->c[0] = GPCMD_MODE_SENSE_10;
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	pc->c[1] = 0;
	pc->c[2] = page_code + (type << 6);

	switch (page_code) {
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	case IDEFLOPPY_CAPABILITIES_PAGE:
		length += 12;
		break;
	case IDEFLOPPY_FLEXIBLE_DISK_PAGE:
		length += 32;
		break;
	default:
		printk(KERN_ERR "ide-floppy: unsupported page code "
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				"in create_mode_sense_cmd\n");
	}
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	put_unaligned(cpu_to_be16(length), (u16 *) &pc->c[7]);
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	pc->req_xfer = length;
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}

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static void idefloppy_create_start_stop_cmd(struct ide_atapi_pc *pc, int start)
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{
	idefloppy_init_pc(pc);
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	pc->c[0] = GPCMD_START_STOP_UNIT;
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	pc->c[4] = start;
}

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static void idefloppy_create_rw_cmd(idefloppy_floppy_t *floppy,
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				    struct ide_atapi_pc *pc, struct request *rq,
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				    unsigned long sector)
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{
	int block = sector / floppy->bs_factor;
	int blocks = rq->nr_sectors / floppy->bs_factor;
	int cmd = rq_data_dir(rq);

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	debug_log("create_rw10_cmd: block == %d, blocks == %d\n",
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		block, blocks);

	idefloppy_init_pc(pc);
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	pc->c[0] = cmd == READ ? GPCMD_READ_10 : GPCMD_WRITE_10;
	put_unaligned(cpu_to_be16(blocks), (unsigned short *)&pc->c[7]);
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	put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[2]);
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	memcpy(rq->cmd, pc->c, 12);

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	pc->rq = rq;
	pc->b_count = cmd == READ ? 0 : rq->bio->bi_size;
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	if (rq->cmd_flags & REQ_RW)
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		pc->flags |= PC_FLAG_WRITING;
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	pc->buf = NULL;
	pc->req_xfer = pc->buf_size = blocks * floppy->block_size;
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	pc->flags |= PC_FLAG_DMA_OK;
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}

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static void idefloppy_blockpc_cmd(idefloppy_floppy_t *floppy,
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		struct ide_atapi_pc *pc, struct request *rq)
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{
	idefloppy_init_pc(pc);
	memcpy(pc->c, rq->cmd, sizeof(pc->c));
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	pc->rq = rq;
	pc->b_count = rq->data_len;
	if (rq->data_len && rq_data_dir(rq) == WRITE)
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		pc->flags |= PC_FLAG_WRITING;
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	pc->buf = rq->data;
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	if (rq->bio)
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		pc->flags |= PC_FLAG_DMA_OK;
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	/*
	 * possibly problematic, doesn't look like ide-floppy correctly
	 * handled scattered requests if dma fails...
	 */
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	pc->req_xfer = pc->buf_size = rq->data_len;
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}

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static ide_startstop_t idefloppy_do_request(ide_drive_t *drive,
		struct request *rq, sector_t block_s)
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{
	idefloppy_floppy_t *floppy = drive->driver_data;
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	struct ide_atapi_pc *pc;
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	unsigned long block = (unsigned long)block_s;

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	debug_log("dev: %s, cmd_type: %x, errors: %d\n",
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			rq->rq_disk ? rq->rq_disk->disk_name : "?",
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			rq->cmd_type, rq->errors);
	debug_log("sector: %ld, nr_sectors: %ld, "
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			"current_nr_sectors: %d\n", (long)rq->sector,
			rq->nr_sectors, rq->current_nr_sectors);

	if (rq->errors >= ERROR_MAX) {
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		if (floppy->failed_pc)
			ide_floppy_report_error(floppy, floppy->failed_pc);
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		else
			printk(KERN_ERR "ide-floppy: %s: I/O error\n",
				drive->name);
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		idefloppy_end_request(drive, 0, 0);
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		return ide_stopped;
	}
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	if (blk_fs_request(rq)) {
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		if (((long)rq->sector % floppy->bs_factor) ||
		    (rq->nr_sectors % floppy->bs_factor)) {
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			printk(KERN_ERR "%s: unsupported r/w request size\n",
					drive->name);
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			idefloppy_end_request(drive, 0, 0);
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			return ide_stopped;
		}
		pc = idefloppy_next_pc_storage(drive);
		idefloppy_create_rw_cmd(floppy, pc, rq, block);
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	} else if (blk_special_request(rq)) {
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		pc = (struct ide_atapi_pc *) rq->buffer;
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	} else if (blk_pc_request(rq)) {
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		pc = idefloppy_next_pc_storage(drive);
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		idefloppy_blockpc_cmd(floppy, pc, rq);
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	} else {
		blk_dump_rq_flags(rq,
			"ide-floppy: unsupported command in queue");
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		idefloppy_end_request(drive, 0, 0);
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		return ide_stopped;
	}

	pc->rq = rq;
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	return idefloppy_issue_pc(drive, pc);
}

/*
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 * Add a special packet command request to the tail of the request queue,
 * and wait for it to be serviced.
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 */
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static int idefloppy_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc)
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{
	struct ide_floppy_obj *floppy = drive->driver_data;
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	struct request *rq;
	int error;
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	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
	rq->buffer = (char *) pc;
	rq->cmd_type = REQ_TYPE_SPECIAL;
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	memcpy(rq->cmd, pc->c, 12);
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	error = blk_execute_rq(drive->queue, floppy->disk, rq, 0);
	blk_put_request(rq);
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	return error;
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}

/*
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 * Look at the flexible disk page parameters. We ignore the CHS capacity
 * parameters and use the LBA parameters instead.
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 */
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static int ide_floppy_get_flexible_disk_page(ide_drive_t *drive)
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{
	idefloppy_floppy_t *floppy = drive->driver_data;
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	struct ide_atapi_pc pc;
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	u8 *page;
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	int capacity, lba_capacity;
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	u16 transfer_rate, sector_size, cyls, rpm;
	u8 heads, sectors;
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	idefloppy_create_mode_sense_cmd(&pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE,
					MODE_SENSE_CURRENT);

	if (idefloppy_queue_pc_tail(drive, &pc)) {
		printk(KERN_ERR "ide-floppy: Can't get flexible disk page"
				" parameters\n");
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		return 1;
	}
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	floppy->wp = !!(pc.buf[3] & 0x80);
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	set_disk_ro(floppy->disk, floppy->wp);
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	page = &pc.buf[8];
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	transfer_rate = be16_to_cpup((__be16 *)&pc.buf[8 + 2]);
	sector_size   = be16_to_cpup((__be16 *)&pc.buf[8 + 6]);
	cyls          = be16_to_cpup((__be16 *)&pc.buf[8 + 8]);
	rpm           = be16_to_cpup((__be16 *)&pc.buf[8 + 28]);
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	heads         = pc.buf[8 + 4];
	sectors       = pc.buf[8 + 5];
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	capacity = cyls * heads * sectors * sector_size;

	if (memcmp(page, &floppy->flexible_disk_page, 32))
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		printk(KERN_INFO "%s: %dkB, %d/%d/%d CHS, %d kBps, "
				"%d sector size, %d rpm\n",
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				drive->name, capacity / 1024, cyls, heads,
				sectors, transfer_rate / 8, sector_size, rpm);

	memcpy(&floppy->flexible_disk_page, page, 32);
	drive->bios_cyl = cyls;
	drive->bios_head = heads;
	drive->bios_sect = sectors;
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	lba_capacity = floppy->blocks * floppy->block_size;
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	if (capacity < lba_capacity) {
		printk(KERN_NOTICE "%s: The disk reports a capacity of %d "
			"bytes, but the drive only handles %d\n",
			drive->name, lba_capacity, capacity);
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		floppy->blocks = floppy->block_size ?
			capacity / floppy->block_size : 0;
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	}
	return 0;
}

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static int idefloppy_get_sfrp_bit(ide_drive_t *drive)
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{
	idefloppy_floppy_t *floppy = drive->driver_data;
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	struct ide_atapi_pc pc;
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	floppy->srfp = 0;
	idefloppy_create_mode_sense_cmd(&pc, IDEFLOPPY_CAPABILITIES_PAGE,
						 MODE_SENSE_CURRENT);

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	pc.flags |= PC_FLAG_SUPPRESS_ERROR;
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	if (idefloppy_queue_pc_tail(drive, &pc))
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		return 1;

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	floppy->srfp = pc.buf[8 + 2] & 0x40;
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	return 0;
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}

/*
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 * Determine if a media is present in the floppy drive, and if so, its LBA
 * capacity.
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 */
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static int ide_floppy_get_capacity(ide_drive_t *drive)
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{
	idefloppy_floppy_t *floppy = drive->driver_data;
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	struct ide_atapi_pc pc;
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	u8 *cap_desc;
	u8 header_len, desc_cnt;
	int i, rc = 1, blocks, length;

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	drive->bios_cyl = 0;
	drive->bios_head = drive->bios_sect = 0;
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	floppy->blocks = 0;
	floppy->bs_factor = 1;
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	set_capacity(floppy->disk, 0);

	idefloppy_create_read_capacity_cmd(&pc);
	if (idefloppy_queue_pc_tail(drive, &pc)) {
		printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
		return 1;
	}
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	header_len = pc.buf[3];
	cap_desc = &pc.buf[4];
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	desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */

	for (i = 0; i < desc_cnt; i++) {
		unsigned int desc_start = 4 + i*8;

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		blocks = be32_to_cpup((__be32 *)&pc.buf[desc_start]);
		length = be16_to_cpup((__be16 *)&pc.buf[desc_start + 6]);
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		debug_log("Descriptor %d: %dkB, %d blocks, %d sector size\n",
				i, blocks * length / 1024, blocks, length);
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		if (i)
			continue;
		/*
		 * the code below is valid only for the 1st descriptor, ie i=0
		 */
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		switch (pc.buf[desc_start + 4] & 0x03) {
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		/* Clik! drive returns this instead of CAPACITY_CURRENT */
		case CAPACITY_UNFORMATTED:
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			if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
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				/*
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				 * If it is not a clik drive, break out
				 * (maintains previous driver behaviour)
				 */
				break;
		case CAPACITY_CURRENT:
			/* Normal Zip/LS-120 disks */
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			if (memcmp(cap_desc, &floppy->cap_desc, 8))
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				printk(KERN_INFO "%s: %dkB, %d blocks, %d "
					"sector size\n", drive->name,
					blocks * length / 1024, blocks, length);
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			memcpy(&floppy->cap_desc, cap_desc, 8);

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			if (!length || length % 512) {
				printk(KERN_NOTICE "%s: %d bytes block size "
					"not supported\n", drive->name, length);
			} else {
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				floppy->blocks = blocks;
				floppy->block_size = length;
				floppy->bs_factor = length / 512;
				if (floppy->bs_factor != 1)
					printk(KERN_NOTICE "%s: warning: non "
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						"512 bytes block size not "
						"fully supported\n",
						drive->name);
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				rc = 0;
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			}
			break;
		case CAPACITY_NO_CARTRIDGE:
			/*
			 * This is a KERN_ERR so it appears on screen
			 * for the user to see
			 */
			printk(KERN_ERR "%s: No disk in drive\n", drive->name);
			break;
		case CAPACITY_INVALID:
			printk(KERN_ERR "%s: Invalid capacity for disk "
				"in drive\n", drive->name);
			break;
		}
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		debug_log("Descriptor 0 Code: %d\n",
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			  pc.buf[desc_start + 4] & 0x03);
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	}

	/* Clik! disk does not support get_flexible_disk_page */
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	if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
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		(void) ide_floppy_get_flexible_disk_page(drive);
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	set_capacity(floppy->disk, floppy->blocks * floppy->bs_factor);
	return rc;
}

/*
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 * Obtain the list of formattable capacities.
 * Very similar to ide_floppy_get_capacity, except that we push the capacity
 * descriptors to userland, instead of our own structures.
 *
 * Userland gives us the following structure:
 *
 * struct idefloppy_format_capacities {
 *	int nformats;
 *	struct {
 *		int nblocks;
 *		int blocksize;
 *	} formats[];
 * };
 *
 * userland initializes nformats to the number of allocated formats[] records.
 * On exit we set nformats to the number of records we've actually initialized.
 */
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static int ide_floppy_get_format_capacities(ide_drive_t *drive, int __user *arg)
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{
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	struct ide_atapi_pc pc;
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	u8 header_len, desc_cnt;
	int i, blocks, length, u_array_size, u_index;
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	int __user *argp;

	if (get_user(u_array_size, arg))
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		return -EFAULT;
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	if (u_array_size <= 0)
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		return -EINVAL;
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	idefloppy_create_read_capacity_cmd(&pc);
	if (idefloppy_queue_pc_tail(drive, &pc)) {
		printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
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		return -EIO;
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	}
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	header_len = pc.buf[3];
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	desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
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	u_index = 0;
	argp = arg + 1;

	/*
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	 * We always skip the first capacity descriptor.  That's the current
	 * capacity.  We are interested in the remaining descriptors, the
	 * formattable capacities.
	 */
	for (i = 1; i < desc_cnt; i++) {
		unsigned int desc_start = 4 + i*8;
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		if (u_index >= u_array_size)
			break;	/* User-supplied buffer too small */

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		blocks = be32_to_cpup((__be32 *)&pc.buf[desc_start]);
		length = be16_to_cpup((__be16 *)&pc.buf[desc_start + 6]);
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		if (put_user(blocks, argp))
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			return -EFAULT;

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		++argp;

		if (put_user(length, argp))
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			return -EFAULT;

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		++argp;

		++u_index;
	}

	if (put_user(u_index, arg))
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		return -EFAULT;

	return 0;
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}

/*
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 * Get ATAPI_FORMAT_UNIT progress indication.
 *
 * Userland gives a pointer to an int.  The int is set to a progress
 * indicator 0-65536, with 65536=100%.
 *
 * If the drive does not support format progress indication, we just check
 * the dsc bit, and return either 0 or 65536.
 */
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static int ide_floppy_get_format_progress(ide_drive_t *drive, int __user *arg)
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{
	idefloppy_floppy_t *floppy = drive->driver_data;
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	struct ide_atapi_pc pc;
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	int progress_indication = 0x10000;

	if (floppy->srfp) {
		idefloppy_create_request_sense_cmd(&pc);
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		if (idefloppy_queue_pc_tail(drive, &pc))
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			return -EIO;
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		if (floppy->sense_key == 2 &&
		    floppy->asc == 4 &&
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		    floppy->ascq == 4)
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			progress_indication = floppy->progress_indication;
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		/* Else assume format_unit has finished, and we're at 0x10000 */
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	} else {
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		ide_hwif_t *hwif = drive->hwif;
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		unsigned long flags;
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		u8 stat;
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		local_irq_save(flags);
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		stat = hwif->tp_ops->read_status(hwif);
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		local_irq_restore(flags);

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		progress_indication = ((stat & ATA_DSC) == 0) ? 0 : 0x10000;
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	}
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	if (put_user(progress_indication, arg))
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		return -EFAULT;
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	return 0;
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}

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static sector_t idefloppy_capacity(ide_drive_t *drive)
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{
	idefloppy_floppy_t *floppy = drive->driver_data;
	unsigned long capacity = floppy->blocks * floppy->bs_factor;

	return capacity;
}

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#ifdef CONFIG_IDE_PROC_FS
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ide_devset_rw(bios_cyl,  0, 1023, bios_cyl);
ide_devset_rw(bios_head, 0,  255, bios_head);
ide_devset_rw(bios_sect, 0,   63, bios_sect);

static int get_ticks(ide_drive_t *drive)
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{
	idefloppy_floppy_t *floppy = drive->driver_data;
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	return floppy->ticks;
}
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static int set_ticks(ide_drive_t *drive, int arg)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	floppy->ticks = arg;
	return 0;
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}
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IDE_DEVSET(ticks, S_RW, 0, 255, get_ticks, set_ticks);

static const struct ide_devset *idefloppy_settings[] = {
	&ide_devset_bios_cyl,
	&ide_devset_bios_head,
	&ide_devset_bios_sect,
	&ide_devset_ticks,
	NULL
};
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#endif
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static void idefloppy_setup(ide_drive_t *drive, idefloppy_floppy_t *floppy)
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{
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	u16 *id = drive->id;
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	u8 gcw[2];
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	*((u16 *)&gcw) = id[ATA_ID_CONFIG];
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	floppy->pc = floppy->pc_stack;
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	drive->pc_callback = ide_floppy_callback;
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	if (((gcw[0] & 0x60) >> 5) == 1)
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		drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
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	/*
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	 * We used to check revisions here. At this point however I'm giving up.
	 * Just assume they are all broken, its easier.
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	 *
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	 * The actual reason for the workarounds was likely a driver bug after
	 * all rather than a firmware bug, and the workaround below used to hide
	 * it. It should be fixed as of version 1.9, but to be on the safe side
	 * we'll leave the limitation below for the 2.2.x tree.
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	 */