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[davej-history.git] / drivers / block / ide-floppy.c

/*
 * linux/drivers/block/ide-floppy.c     Version 0.8             Dec   7, 1997
 *
 * Copyright (C) 1996, 1997 Gadi Oxman <gadio@netvision.net.il>
 */

/*
 * IDE ATAPI floppy driver.
 *
 * The driver currently doesn't have any fancy features, just the bare
 * minimum read/write support.
 *
 * Many thanks to Lode Leroy <Lode.Leroy@www.ibase.be>, who tested so many
 * ALPHA patches to this driver on an EASYSTOR LS-120 ATAPI floppy drive.
 *
 * Ver 0.1   Oct 17 96   Initial test version, mostly based on ide-tape.c.
 * Ver 0.2   Oct 31 96   Minor changes.
 * Ver 0.3   Dec  2 96   Fixed error recovery bug.
 * Ver 0.4   Jan 26 97   Add support for the HDIO_GETGEO ioctl.
 * Ver 0.5   Feb 21 97   Add partitions support.
 *                       Use the minimum of the LBA and CHS capacities.
 *                       Avoid hwgroup->rq == NULL on the last irq.
 *                       Fix potential null dereferencing with DEBUG_LOG.
 * Ver 0.8   Dec  7 97   Increase irq timeout from 10 to 50 seconds.
 *                       Add media write-protect detection.
 *                       Issue START command only if TEST UNIT READY fails.
 *                       Add work-around for IOMEGA ZIP revision 21.D.
 *                       Remove idefloppy_get_capabilities().
 */

#define IDEFLOPPY_VERSION "0.8"

#include <linux/config.h>
#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/malloc.h>
#include <linux/cdrom.h>
#include <linux/ide.h>

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

/*
 *      The following are used to debug the driver.
 */
#define IDEFLOPPY_DEBUG_LOG             0
#define IDEFLOPPY_DEBUG_INFO            0
#define IDEFLOPPY_DEBUG_BUGS            1

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

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

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

/*
 *      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.
 */
#define IDEFLOPPY_PC_STACK              (10 + IDEFLOPPY_MAX_PC_RETRIES)

/*
 *      Our view of a packet command.
 */
typedef struct idefloppy_packet_command_s {
        u8 c[12];                               /* Actual packet bytes */
        int retries;                            /* On each retry, we increment retries */
        int error;                              /* Error code */
        int request_transfer;                   /* Bytes to transfer */
        int actually_transferred;               /* Bytes actually transferred */
        int buffer_size;                        /* Size of our data buffer */
        char *b_data;                           /* Pointer which runs on the buffers */
        int b_count;                            /* Missing/Available data on the current buffer */
        struct request *rq;                     /* The corresponding request */
        byte *buffer;                           /* Data buffer */
        byte *current_position;                 /* Pointer into the above buffer */
        void (*callback) (ide_drive_t *);       /* Called when this packet command is completed */
        byte pc_buffer[IDEFLOPPY_PC_BUFFER_SIZE];       /* Temporary buffer */
        unsigned int flags;                     /* Status/Action bit flags */
} idefloppy_pc_t;

/*
 *      Packet command flag bits.
 */
#define PC_ABORT                        0       /* Set when an error is considered normal - We won't retry */
#define PC_DMA_RECOMMENDED              2       /* 1 when we prefer to use DMA if possible */
#define PC_DMA_IN_PROGRESS              3       /* 1 while DMA in progress */
#define PC_DMA_ERROR                    4       /* 1 when encountered problem during DMA */
#define PC_WRITING                      5       /* Data direction */

/*
 *      Removable Block Access Capabilities Page
 */
typedef struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
        unsigned        page_code       :6;     /* Page code - Should be 0x1b */
        unsigned        reserved1_6     :1;     /* Reserved */
        unsigned        ps              :1;     /* Should be 0 */
#elif defined(__BIG_ENDIAN_BITFIELD)
        unsigned        ps              :1;     /* Should be 0 */
        unsigned        reserved1_6     :1;     /* Reserved */
        unsigned        page_code       :6;     /* Page code - Should be 0x1b */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        u8              page_length;            /* Page Length - Should be 0xa */
#if defined(__LITTLE_ENDIAN_BITFIELD)
        unsigned        reserved2       :6;
        unsigned        srfp            :1;     /* Supports reporting progress of format */
        unsigned        sflp            :1;     /* System floppy type device */
        unsigned        tlun            :3;     /* Total logical units supported by the device */
        unsigned        reserved3       :3;
        unsigned        sml             :1;     /* Single / Multiple lun supported */
        unsigned        ncd             :1;     /* Non cd optical device */
#elif defined(__BIG_ENDIAN_BITFIELD)
        unsigned        sflp            :1;     /* System floppy type device */
        unsigned        srfp            :1;     /* Supports reporting progress of format */
        unsigned        reserved2       :6;
        unsigned        ncd             :1;     /* Non cd optical device */
        unsigned        sml             :1;     /* Single / Multiple lun supported */
        unsigned        reserved3       :3;
        unsigned        tlun            :3;     /* Total logical units supported by the device */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        u8              reserved[8];
} idefloppy_capabilities_page_t;

/*
 *      Flexible disk page.
 */
typedef struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
        unsigned        page_code       :6;     /* Page code - Should be 0x5 */
        unsigned        reserved1_6     :1;     /* Reserved */
        unsigned        ps              :1;     /* The device is capable of saving the page */
#elif defined(__BIG_ENDIAN_BITFIELD)
        unsigned        ps              :1;     /* The device is capable of saving the page */
        unsigned        reserved1_6     :1;     /* Reserved */
        unsigned        page_code       :6;     /* Page code - Should be 0x5 */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        u8              page_length;            /* Page Length - Should be 0x1e */
        u16             transfer_rate;          /* In kilobits per second */
        u8              heads, sectors;         /* Number of heads, Number of sectors per track */
        u16             sector_size;            /* Byes per sector */
        u16             cyls;                   /* Number of cylinders */
        u8              reserved10[10];
        u8              motor_delay;            /* Motor off delay */
        u8              reserved21[7];
        u16             rpm;                    /* Rotations per minute */
        u8              reserved30[2];
} idefloppy_flexible_disk_page_t;
 
/*
 *      Format capacity
 */
typedef struct {
        u8              reserved[3];
        u8              length;                 /* Length of the following descriptors in bytes */
} idefloppy_capacity_header_t;

typedef struct {
        u32             blocks;                 /* Number of blocks */
#if defined(__LITTLE_ENDIAN_BITFIELD)
        unsigned        dc              :2;     /* Descriptor Code */
        unsigned        reserved        :6;
#elif defined(__BIG_ENDIAN_BITFIELD)
        unsigned        reserved        :6;
        unsigned        dc              :2;     /* Descriptor Code */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        u8              length_msb;             /* Block Length (MSB)*/
        u16             length;                 /* Block Length */
} idefloppy_capacity_descriptor_t;

#define CAPACITY_INVALID        0x00
#define CAPACITY_UNFORMATTED    0x01
#define CAPACITY_CURRENT        0x02
#define CAPACITY_NO_CARTRIDGE   0x03

/*
 *      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.
 */
typedef struct {
        ide_drive_t *drive;

        idefloppy_pc_t *pc;                     /* Current packet command */
        idefloppy_pc_t *failed_pc;              /* Last failed packet command */
        idefloppy_pc_t pc_stack[IDEFLOPPY_PC_STACK];/* Packet command stack */
        int pc_stack_index;                     /* Next free packet command storage space */
        struct request rq_stack[IDEFLOPPY_PC_STACK];
        int rq_stack_index;                     /* We implement a circular array */

        /*
         *      Last error information
         */
        byte sense_key, asc, ascq;

        /*
         *      Device information
         */
        int blocks, block_size, bs_factor;                      /* Current format */
        idefloppy_capacity_descriptor_t capacity;               /* Last format capacity */
        idefloppy_flexible_disk_page_t flexible_disk_page;      /* Copy of the flexible disk page */
        int wp;                                                 /* Write protect */

        unsigned int flags;                     /* Status/Action flags */
} idefloppy_floppy_t;

/*
 *      Floppy flag bits values.
 */
#define IDEFLOPPY_DRQ_INTERRUPT         0       /* DRQ interrupt device */
#define IDEFLOPPY_MEDIA_CHANGED         1       /* Media may have changed */
#define IDEFLOPPY_USE_READ12            2       /* Use READ12/WRITE12 or READ10/WRITE10 */

/*
 *      ATAPI floppy drive packet commands
 */
#define IDEFLOPPY_FORMAT_UNIT_CMD       0x04
#define IDEFLOPPY_INQUIRY_CMD           0x12
#define IDEFLOPPY_MODE_SELECT_CMD       0x55
#define IDEFLOPPY_MODE_SENSE_CMD        0x5a
#define IDEFLOPPY_READ10_CMD            0x28
#define IDEFLOPPY_READ12_CMD            0xa8
#define IDEFLOPPY_READ_CAPACITY_CMD     0x23
#define IDEFLOPPY_REQUEST_SENSE_CMD     0x03
#define IDEFLOPPY_PREVENT_REMOVAL_CMD   0x1e
#define IDEFLOPPY_SEEK_CMD              0x2b
#define IDEFLOPPY_START_STOP_CMD        0x1b
#define IDEFLOPPY_TEST_UNIT_READY_CMD   0x00
#define IDEFLOPPY_VERIFY_CMD            0x2f
#define IDEFLOPPY_WRITE10_CMD           0x2a
#define IDEFLOPPY_WRITE12_CMD           0xaa
#define IDEFLOPPY_WRITE_VERIFY_CMD      0x2e

/*
 *      Defines for the mode sense command
 */
#define MODE_SENSE_CURRENT              0x00
#define MODE_SENSE_CHANGEABLE           0x01
#define MODE_SENSE_DEFAULT              0x02 
#define MODE_SENSE_SAVED                0x03

/*
 *      Special requests for our block device strategy routine.
 */
#define IDEFLOPPY_FIRST_RQ              90

/*
 *      IDEFLOPPY_PC_RQ is used to queue a packet command in the request queue.
 */
#define IDEFLOPPY_PC_RQ                 90

#define IDEFLOPPY_LAST_RQ               90

/*
 *      A macro which can be used to check if a given request command
 *      originated in the driver or in the buffer cache layer.
 */
#define IDEFLOPPY_RQ_CMD(cmd)           ((cmd >= IDEFLOPPY_FIRST_RQ) && (cmd <= IDEFLOPPY_LAST_RQ))

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

/*
 *      The ATAPI Status Register.
 */
typedef union {
        unsigned all                    :8;
        struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
                unsigned check          :1;     /* Error occurred */
                unsigned idx            :1;     /* Reserved */
                unsigned corr           :1;     /* Correctable error occurred */
                unsigned drq            :1;     /* Data is request by the device */
                unsigned dsc            :1;     /* Media access command finished */
                unsigned reserved5      :1;     /* Reserved */
                unsigned drdy           :1;     /* Ignored for ATAPI commands (ready to accept ATA command) */
                unsigned bsy            :1;     /* The device has access to the command block */
#elif defined(__BIG_ENDIAN_BITFIELD)
                unsigned bsy            :1;     /* The device has access to the command block */
                unsigned drdy           :1;     /* Ignored for ATAPI commands (ready to accept ATA command) */
                unsigned reserved5      :1;     /* Reserved */
                unsigned dsc            :1;     /* Media access command finished */
                unsigned drq            :1;     /* Data is request by the device */
                unsigned corr           :1;     /* Correctable error occurred */
                unsigned idx            :1;     /* Reserved */
                unsigned check          :1;     /* Error occurred */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        } b;
} idefloppy_status_reg_t;

/*
 *      The ATAPI error register.
 */
typedef union {
        unsigned all                    :8;
        struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
                unsigned ili            :1;     /* Illegal Length Indication */
                unsigned eom            :1;     /* End Of Media Detected */
                unsigned abrt           :1;     /* Aborted command - As defined by ATA */
                unsigned mcr            :1;     /* Media Change Requested - As defined by ATA */
                unsigned sense_key      :4;     /* Sense key of the last failed packet command */
#elif defined(__BIG_ENDIAN_BITFIELD)
                unsigned sense_key      :4;     /* Sense key of the last failed packet command */
                unsigned mcr            :1;     /* Media Change Requested - As defined by ATA */
                unsigned abrt           :1;     /* Aborted command - As defined by ATA */
                unsigned eom            :1;     /* End Of Media Detected */
                unsigned ili            :1;     /* Illegal Length Indication */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        } b;
} idefloppy_error_reg_t;

/*
 *      ATAPI Feature Register
 */
typedef union {
        unsigned all                    :8;
        struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
                unsigned dma            :1;     /* Using DMA or PIO */
                unsigned reserved321    :3;     /* Reserved */
                unsigned reserved654    :3;     /* Reserved (Tag Type) */
                unsigned reserved7      :1;     /* Reserved */
#elif defined(__BIG_ENDIAN_BITFIELD)
                unsigned reserved7      :1;     /* Reserved */
                unsigned reserved654    :3;     /* Reserved (Tag Type) */
                unsigned reserved321    :3;     /* Reserved */
                unsigned dma            :1;     /* Using DMA or PIO */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        } b;
} idefloppy_feature_reg_t;

/*
 *      ATAPI Byte Count Register.
 */
typedef union {
        unsigned all                    :16;
        struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
                unsigned low            :8;     /* LSB */
                unsigned high           :8;     /* MSB */
#elif defined(__BIG_ENDIAN_BITFIELD)
                unsigned high           :8;     /* MSB */
                unsigned low            :8;     /* LSB */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        } b;
} idefloppy_bcount_reg_t;

/*
 *      ATAPI Interrupt Reason Register.
 */
typedef union {
        unsigned all                    :8;
        struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
                unsigned cod            :1;     /* Information transferred is command (1) or data (0) */
                unsigned io             :1;     /* The device requests us to read (1) or write (0) */
                unsigned reserved       :6;     /* Reserved */
#elif defined(__BIG_ENDIAN_BITFIELD)
                unsigned reserved       :6;     /* Reserved */
                unsigned io             :1;     /* The device requests us to read (1) or write (0) */
                unsigned cod            :1;     /* Information transferred is command (1) or data (0) */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        } b;
} idefloppy_ireason_reg_t;

/*
 *      ATAPI floppy Drive Select Register
 */
typedef union { 
        unsigned all                    :8;
        struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
                unsigned sam_lun        :3;     /* Logical unit number */
                unsigned reserved3      :1;     /* Reserved */
                unsigned drv            :1;     /* The responding drive will be drive 0 (0) or drive 1 (1) */
                unsigned one5           :1;     /* Should be set to 1 */
                unsigned reserved6      :1;     /* Reserved */
                unsigned one7           :1;     /* Should be set to 1 */
#elif defined(__BIG_ENDIAN_BITFIELD)
                unsigned one7           :1;     /* Should be set to 1 */
                unsigned reserved6      :1;     /* Reserved */
                unsigned one5           :1;     /* Should be set to 1 */
                unsigned drv            :1;     /* The responding drive will be drive 0 (0) or drive 1 (1) */
                unsigned reserved3      :1;     /* Reserved */
                unsigned sam_lun        :3;     /* Logical unit number */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        } b;
} idefloppy_drivesel_reg_t;

/*
 *      ATAPI Device Control Register
 */
typedef union {                 
        unsigned all                    :8;
        struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
                unsigned zero0          :1;     /* Should be set to zero */
                unsigned nien           :1;     /* Device interrupt is disabled (1) or enabled (0) */
                unsigned srst           :1;     /* ATA software reset. ATAPI devices should use the new ATAPI srst. */
                unsigned one3           :1;     /* Should be set to 1 */
                unsigned reserved4567   :4;     /* Reserved */
#elif defined(__BIG_ENDIAN_BITFIELD)
                unsigned reserved4567   :4;     /* Reserved */
                unsigned one3           :1;     /* Should be set to 1 */
                unsigned srst           :1;     /* ATA software reset. ATAPI devices should use the new ATAPI srst. */
                unsigned nien           :1;     /* Device interrupt is disabled (1) or enabled (0) */
                unsigned zero0          :1;     /* Should be set to zero */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        } b;
} idefloppy_control_reg_t;

/*
 *      The following is used to format the general configuration word of
 *      the ATAPI IDENTIFY DEVICE command.
 */
struct idefloppy_id_gcw {       
#if defined(__LITTLE_ENDIAN_BITFIELD)
        unsigned packet_size            :2;     /* Packet Size */
        unsigned reserved234            :3;     /* Reserved */
        unsigned drq_type               :2;     /* Command packet DRQ type */
        unsigned removable              :1;     /* Removable media */
        unsigned device_type            :5;     /* Device type */
        unsigned reserved13             :1;     /* Reserved */
        unsigned protocol               :2;     /* Protocol type */
#elif defined(__BIG_ENDIAN_BITFIELD)
        unsigned protocol               :2;     /* Protocol type */
        unsigned reserved13             :1;     /* Reserved */
        unsigned device_type            :5;     /* Device type */
        unsigned removable              :1;     /* Removable media */
        unsigned drq_type               :2;     /* Command packet DRQ type */
        unsigned reserved234            :3;     /* Reserved */
        unsigned packet_size            :2;     /* Packet Size */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
};

/*
 *      INQUIRY packet command - Data Format
 */
typedef struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
        unsigned        device_type     :5;     /* Peripheral Device Type */
        unsigned        reserved0_765   :3;     /* Peripheral Qualifier - Reserved */
        unsigned        reserved1_6t0   :7;     /* Reserved */
        unsigned        rmb             :1;     /* Removable Medium Bit */
        unsigned        ansi_version    :3;     /* ANSI Version */
        unsigned        ecma_version    :3;     /* ECMA Version */
        unsigned        iso_version     :2;     /* ISO Version */
        unsigned        response_format :4;     /* Response Data Format */
        unsigned        reserved3_45    :2;     /* Reserved */
        unsigned        reserved3_6     :1;     /* TrmIOP - Reserved */
        unsigned        reserved3_7     :1;     /* AENC - Reserved */
#elif defined(__BIG_ENDIAN_BITFIELD)
        unsigned        reserved0_765   :3;     /* Peripheral Qualifier - Reserved */
        unsigned        device_type     :5;     /* Peripheral Device Type */
        unsigned        rmb             :1;     /* Removable Medium Bit */
        unsigned        reserved1_6t0   :7;     /* Reserved */
        unsigned        iso_version     :2;     /* ISO Version */
        unsigned        ecma_version    :3;     /* ECMA Version */
        unsigned        ansi_version    :3;     /* ANSI Version */
        unsigned        reserved3_7     :1;     /* AENC - Reserved */
        unsigned        reserved3_6     :1;     /* TrmIOP - Reserved */
        unsigned        reserved3_45    :2;     /* Reserved */
        unsigned        response_format :4;     /* Response Data Format */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        u8              additional_length;      /* Additional Length (total_length-4) */
        u8              rsv5, rsv6, rsv7;       /* Reserved */
        u8              vendor_id[8];           /* Vendor Identification */
        u8              product_id[16];         /* Product Identification */
        u8              revision_level[4];      /* Revision Level */
        u8              vendor_specific[20];    /* Vendor Specific - Optional */
        u8              reserved56t95[40];      /* Reserved - Optional */
                                                /* Additional information may be returned */
} idefloppy_inquiry_result_t;

/*
 *      REQUEST SENSE packet command result - Data Format.
 */
typedef struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
        unsigned        error_code      :7;     /* Current error (0x70) */
        unsigned        valid           :1;     /* The information field conforms to SFF-8070i */
        u8              reserved1       :8;     /* Reserved */
        unsigned        sense_key       :4;     /* Sense Key */
        unsigned        reserved2_4     :1;     /* Reserved */
        unsigned        ili             :1;     /* Incorrect Length Indicator */
        unsigned        reserved2_67    :2;
#elif defined(__BIG_ENDIAN_BITFIELD)
        unsigned        valid           :1;     /* The information field conforms to SFF-8070i */
        unsigned        error_code      :7;     /* Current error (0x70) */
        u8              reserved1       :8;     /* Reserved */
        unsigned        reserved2_67    :2;
        unsigned        ili             :1;     /* Incorrect Length Indicator */
        unsigned        reserved2_4     :1;     /* Reserved */
        unsigned        sense_key       :4;     /* Sense Key */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        u32             information __attribute__ ((packed));
        u8              asl;                    /* Additional sense length (n-7) */
        u32             command_specific;       /* Additional command specific information */
        u8              asc;                    /* Additional Sense Code */
        u8              ascq;                   /* Additional Sense Code Qualifier */
        u8              replaceable_unit_code;  /* Field Replaceable Unit Code */
        u8              reserved[3];
        u8              pad[2];                 /* Padding to 20 bytes */
} idefloppy_request_sense_result_t;

/*
 *      Pages of the SELECT SENSE / MODE SENSE packet commands.
 */
#define IDEFLOPPY_CAPABILITIES_PAGE     0x1b
#define IDEFLOPPY_FLEXIBLE_DISK_PAGE    0x05

/*
 *      Mode Parameter Header for the MODE SENSE packet command
 */
typedef struct {
        u16             mode_data_length;       /* Length of the following data transfer */
        u8              medium_type;            /* Medium Type */
#if defined(__LITTLE_ENDIAN_BITFIELD)
        unsigned        reserved3       :7;
        unsigned        wp              :1;     /* Write protect */
#elif defined(__BIG_ENDIAN_BITFIELD)
        unsigned        wp              :1;     /* Write protect */
        unsigned        reserved3       :7;
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        u8              reserved[4];
} idefloppy_mode_parameter_header_t;

#define IDEFLOPPY_MIN(a,b)      ((a)<(b) ? (a):(b))
#define IDEFLOPPY_MAX(a,b)      ((a)>(b) ? (a):(b))

/*
 *      Too bad. The drive wants to send us data which we are not ready to accept.
 *      Just throw it away.
 */
static void idefloppy_discard_data (ide_drive_t *drive, unsigned int bcount)
{
        while (bcount--)
                IN_BYTE (IDE_DATA_REG);
}

#if IDEFLOPPY_DEBUG_BUGS
static void idefloppy_write_zeros (ide_drive_t *drive, unsigned int bcount)
{
        while (bcount--)
                OUT_BYTE (0, IDE_DATA_REG);
}
#endif /* IDEFLOPPY_DEBUG_BUGS */

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

#if IDEFLOPPY_DEBUG_LOG
        printk (KERN_INFO "Reached idefloppy_end_request\n");
#endif /* IDEFLOPPY_DEBUG_LOG */

        switch (uptodate) {
                case 0: error = IDEFLOPPY_ERROR_GENERAL; break;
                case 1: error = 0; break;
                default: error = uptodate;
        }
        if (error)
                floppy->failed_pc = NULL;
        /* Why does this happen? */
        if (!rq)
                return;
        if (!IDEFLOPPY_RQ_CMD (rq->cmd)) {
                ide_end_request (uptodate, hwgroup);
                return;
        }
        rq->errors = error;
        ide_end_drive_cmd (drive, 0, 0);
}

static void idefloppy_input_buffers (ide_drive_t *drive, idefloppy_pc_t *pc, unsigned int bcount)
{
        struct request *rq = pc->rq;
        struct buffer_head *bh = rq->bh;
        int count;

        while (bcount) {
                if (pc->b_count == bh->b_size) {
                        rq->sector += rq->current_nr_sectors;
                        rq->nr_sectors -= rq->current_nr_sectors;
                        idefloppy_end_request (1, HWGROUP(drive));
                        if ((bh = rq->bh) != NULL)
                                pc->b_count = 0;
                }
                if (bh == NULL) {
                        printk (KERN_ERR "%s: bh == NULL in idefloppy_input_buffers, bcount == %d\n", drive->name, bcount);
                        idefloppy_discard_data (drive, bcount);
                        return;
                }
                count = IDEFLOPPY_MIN (bh->b_size - pc->b_count, bcount);
                atapi_input_bytes (drive, bh->b_data + pc->b_count, count);
                bcount -= count; pc->b_count += count;
        }
}

static void idefloppy_output_buffers (ide_drive_t *drive, idefloppy_pc_t *pc, unsigned int bcount)
{
        struct request *rq = pc->rq;
        struct buffer_head *bh = rq->bh;
        int count;
        
        while (bcount) {
                if (!pc->b_count) {
                        rq->sector += rq->current_nr_sectors;
                        rq->nr_sectors -= rq->current_nr_sectors;
                        idefloppy_end_request (1, HWGROUP(drive));
                        if ((bh = rq->bh) != NULL) {
                                pc->b_data = bh->b_data;
                                pc->b_count = bh->b_size;
                        }
                }
                if (bh == NULL) {
                        printk (KERN_ERR "%s: bh == NULL in idefloppy_output_buffers, bcount == %d\n", drive->name, bcount);
                        idefloppy_write_zeros (drive, bcount);
                        return;
                }
                count = IDEFLOPPY_MIN (pc->b_count, bcount);
                atapi_output_bytes (drive, pc->b_data, count);
                bcount -= count; pc->b_data += count; pc->b_count -= count;
        }
}

#ifdef CONFIG_BLK_DEV_IDEDMA
static void idefloppy_update_buffers (ide_drive_t *drive, idefloppy_pc_t *pc)
{
        struct request *rq = pc->rq;
        struct buffer_head *bh = rq->bh;

        while ((bh = rq->bh) != NULL)
                idefloppy_end_request (1, HWGROUP(drive));
}
#endif /* CONFIG_BLK_DEV_IDEDMA */

/*
 *      idefloppy_queue_pc_head generates 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.
 */
static void idefloppy_queue_pc_head (ide_drive_t *drive,idefloppy_pc_t *pc,struct request *rq)
{
        ide_init_drive_cmd (rq);
        rq->buffer = (char *) pc;
        rq->cmd = IDEFLOPPY_PC_RQ;
        (void) ide_do_drive_cmd (drive, rq, ide_preempt);
}

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

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

static struct request *idefloppy_next_rq_storage (ide_drive_t *drive)
{
        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++]);
}

/*
 *      idefloppy_analyze_error is called on each failed packet command retry
 *      to analyze the request sense.
 */
static void idefloppy_analyze_error (ide_drive_t *drive,idefloppy_request_sense_result_t *result)
{
        idefloppy_floppy_t *floppy = drive->driver_data;

        floppy->sense_key = result->sense_key; floppy->asc = result->asc; floppy->ascq = result->ascq;
#if IDEFLOPPY_DEBUG_LOG
        if (floppy->failed_pc)
                printk (KERN_INFO "ide-floppy: pc = %x, sense key = %x, asc = %x, ascq = %x\n",floppy->failed_pc->c[0],result->sense_key,result->asc,result->ascq);
        else
                printk (KERN_INFO "ide-floppy: sense key = %x, asc = %x, ascq = %x\n",result->sense_key,result->asc,result->ascq);
#endif /* IDEFLOPPY_DEBUG_LOG */
}

static void idefloppy_request_sense_callback (ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;

#if IDEFLOPPY_DEBUG_LOG
        printk (KERN_INFO "ide-floppy: Reached idefloppy_request_sense_callback\n");
#endif /* IDEFLOPPY_DEBUG_LOG */
        if (!floppy->pc->error) {
                idefloppy_analyze_error (drive,(idefloppy_request_sense_result_t *) floppy->pc->buffer);
                idefloppy_end_request (1,HWGROUP (drive));
        } else {
                printk (KERN_ERR "Error in REQUEST SENSE itself - Aborting request!\n");
                idefloppy_end_request (0,HWGROUP (drive));
        }
}

/*
 *      General packet command callback function.
 */
static void idefloppy_pc_callback (ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        
#if IDEFLOPPY_DEBUG_LOG
        printk (KERN_INFO "ide-floppy: Reached idefloppy_pc_callback\n");
#endif /* IDEFLOPPY_DEBUG_LOG */

        idefloppy_end_request (floppy->pc->error ? 0:1, HWGROUP(drive));
}

/*
 *      idefloppy_init_pc initializes a packet command.
 */
static void idefloppy_init_pc (idefloppy_pc_t *pc)
{
        memset (pc->c, 0, 12);
        pc->retries = 0;
        pc->flags = 0;
        pc->request_transfer = 0;
        pc->buffer = pc->pc_buffer;
        pc->buffer_size = IDEFLOPPY_PC_BUFFER_SIZE;
        pc->b_data = NULL;
        pc->callback = &idefloppy_pc_callback;
}

static void idefloppy_create_request_sense_cmd (idefloppy_pc_t *pc)
{
        idefloppy_init_pc (pc); 
        pc->c[0] = IDEFLOPPY_REQUEST_SENSE_CMD;
        pc->c[4] = 255;
        pc->request_transfer = 18;
        pc->callback = &idefloppy_request_sense_callback;
}

/*
 *      idefloppy_retry_pc is 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.
 */
static void idefloppy_retry_pc (ide_drive_t *drive)
{
        idefloppy_pc_t *pc;
        struct request *rq;
        idefloppy_error_reg_t error;

        error.all = IN_BYTE (IDE_ERROR_REG);
        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);
}

/*
 *      idefloppy_pc_intr is the usual interrupt handler which will be called
 *      during a packet command.
 */
static void idefloppy_pc_intr (ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        idefloppy_status_reg_t status;
        idefloppy_bcount_reg_t bcount;
        idefloppy_ireason_reg_t ireason;
        idefloppy_pc_t *pc=floppy->pc;
        struct request *rq = pc->rq;
        unsigned int temp;

#if IDEFLOPPY_DEBUG_LOG
        printk (KERN_INFO "ide-floppy: Reached idefloppy_pc_intr interrupt handler\n");
#endif /* IDEFLOPPY_DEBUG_LOG */        

#ifdef CONFIG_BLK_DEV_IDEDMA
        if (test_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
                if (HWIF(drive)->dmaproc(ide_dma_end, drive)) {
                        set_bit (PC_DMA_ERROR, &pc->flags);
                } else {
                        pc->actually_transferred=pc->request_transfer;
                        idefloppy_update_buffers (drive, pc);
                }
#if IDEFLOPPY_DEBUG_LOG
                printk (KERN_INFO "ide-floppy: DMA finished\n");
#endif /* IDEFLOPPY_DEBUG_LOG */
        }
#endif /* CONFIG_BLK_DEV_IDEDMA */

        status.all = GET_STAT();                                        /* Clear the interrupt */

        if (!status.b.drq) {                                            /* No more interrupts */
#if IDEFLOPPY_DEBUG_LOG
                printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
#endif /* IDEFLOPPY_DEBUG_LOG */
                clear_bit (PC_DMA_IN_PROGRESS, &pc->flags);

                ide__sti();     /* local CPU only */

                if (status.b.check || test_bit (PC_DMA_ERROR, &pc->flags)) {    /* Error detected */
#if IDEFLOPPY_DEBUG_LOG
                        printk (KERN_INFO "ide-floppy: %s: I/O error\n",drive->name);
#endif /* IDEFLOPPY_DEBUG_LOG */
                        rq->errors++;
                        if (pc->c[0] == IDEFLOPPY_REQUEST_SENSE_CMD) {
                                printk (KERN_ERR "ide-floppy: I/O error in request sense command\n");
                                ide_do_reset (drive);
                                return;
                        }
                        idefloppy_retry_pc (drive);                             /* Retry operation */
                        return;
                }
                pc->error = 0;
                if (floppy->failed_pc == pc)
                        floppy->failed_pc=NULL;
                pc->callback(drive);                    /* Command finished - Call the callback function */
                return;
        }
#ifdef CONFIG_BLK_DEV_IDEDMA
        if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
                printk (KERN_ERR "ide-floppy: The floppy wants to issue more interrupts in DMA mode\n");
                (void) HWIF(drive)->dmaproc(ide_dma_off, drive);
                ide_do_reset (drive);
                return;
        }
#endif /* CONFIG_BLK_DEV_IDEDMA */
        bcount.b.high=IN_BYTE (IDE_BCOUNTH_REG);                        /* Get the number of bytes to transfer */
        bcount.b.low=IN_BYTE (IDE_BCOUNTL_REG);                 /* on this interrupt */
        ireason.all=IN_BYTE (IDE_IREASON_REG);

        if (ireason.b.cod) {
                printk (KERN_ERR "ide-floppy: CoD != 0 in idefloppy_pc_intr\n");
                ide_do_reset (drive);
                return;
        }
        if (ireason.b.io == test_bit (PC_WRITING, &pc->flags)) {        /* Hopefully, we will never get here */
                printk (KERN_ERR "ide-floppy: We wanted to %s, ", ireason.b.io ? "Write":"Read");
                printk (KERN_ERR "but the floppy wants us to %s !\n",ireason.b.io ? "Read":"Write");
                ide_do_reset (drive);
                return;
        }
        if (!test_bit (PC_WRITING, &pc->flags)) {                       /* Reading - Check that we have enough space */
                temp = pc->actually_transferred + bcount.all;
                if ( temp > pc->request_transfer) {
                        if (temp > pc->buffer_size) {
                                printk (KERN_ERR "ide-floppy: The floppy wants to send us more data than expected - discarding data\n");
                                idefloppy_discard_data (drive,bcount.all);
                                ide_set_handler (drive,&idefloppy_pc_intr,IDEFLOPPY_WAIT_CMD);
                                return;
                        }
#if IDEFLOPPY_DEBUG_LOG
                        printk (KERN_NOTICE "ide-floppy: The floppy wants to send us more data than expected - allowing transfer\n");
#endif /* IDEFLOPPY_DEBUG_LOG */
                }
        }
        if (test_bit (PC_WRITING, &pc->flags)) {
                if (pc->buffer != NULL)
                        atapi_output_bytes (drive,pc->current_position,bcount.all);     /* Write the current buffer */
                else
                        idefloppy_output_buffers (drive, pc, bcount.all);
        } else {
                if (pc->buffer != NULL)
                        atapi_input_bytes (drive,pc->current_position,bcount.all);      /* Read the current buffer */
                else
                        idefloppy_input_buffers (drive, pc, bcount.all);
        }
        pc->actually_transferred+=bcount.all;                           /* Update the current position */
        pc->current_position+=bcount.all;

        ide_set_handler (drive,&idefloppy_pc_intr,IDEFLOPPY_WAIT_CMD);          /* And set the interrupt handler again */
}

static void idefloppy_transfer_pc (ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        idefloppy_ireason_reg_t ireason;

        if (ide_wait_stat (drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
                printk (KERN_ERR "ide-floppy: Strange, packet command initiated yet DRQ isn't asserted\n");
                return;
        }
        ireason.all=IN_BYTE (IDE_IREASON_REG);
        if (!ireason.b.cod || ireason.b.io) {
                printk (KERN_ERR "ide-floppy: (IO,CoD) != (0,1) while issuing a packet command\n");
                ide_do_reset (drive);
                return;
        }
        ide_set_handler (drive, &idefloppy_pc_intr, IDEFLOPPY_WAIT_CMD);        /* Set the interrupt routine */
        atapi_output_bytes (drive, floppy->pc->c, 12);          /* Send the actual packet */
}

/*
 *      Issue a packet command
 */
static void idefloppy_issue_pc (ide_drive_t *drive, idefloppy_pc_t *pc)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        idefloppy_bcount_reg_t bcount;
        int dma_ok = 0;

#if IDEFLOPPY_DEBUG_BUGS
        if (floppy->pc->c[0] == IDEFLOPPY_REQUEST_SENSE_CMD && pc->c[0] == IDEFLOPPY_REQUEST_SENSE_CMD) {
                printk (KERN_ERR "ide-floppy: possible ide-floppy.c bug - Two request sense in serial were issued\n");
        }
#endif /* IDEFLOPPY_DEBUG_BUGS */

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

        if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES || test_bit (PC_ABORT, &pc->flags)) {
                /*
                 *      We will "abort" retrying a packet command in case
                 *      a legitimate error code was received.
                 */
                if (!test_bit (PC_ABORT, &pc->flags)) {
                        printk (KERN_ERR "ide-floppy: %s: I/O error, pc = %2x, key = %2x, asc = %2x, ascq = %2x\n",
                                drive->name, pc->c[0], floppy->sense_key, floppy->asc, floppy->ascq);
                        pc->error = IDEFLOPPY_ERROR_GENERAL;            /* Giving up */
                }
                floppy->failed_pc=NULL;
                pc->callback(drive);
                return;
        }
#if IDEFLOPPY_DEBUG_LOG
        printk (KERN_INFO "Retry number - %d\n",pc->retries);
#endif /* IDEFLOPPY_DEBUG_LOG */

        pc->retries++;
        pc->actually_transferred=0;                                     /* We haven't transferred any data yet */
        pc->current_position=pc->buffer;
        bcount.all=pc->request_transfer;                                /* Request to transfer the entire buffer at once */

#ifdef CONFIG_BLK_DEV_IDEDMA
        if (test_and_clear_bit (PC_DMA_ERROR, &pc->flags)) {
                (void) HWIF(drive)->dmaproc(ide_dma_off, drive);
        }
        if (test_bit (PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma)
                dma_ok=!HWIF(drive)->dmaproc(test_bit (PC_WRITING, &pc->flags) ? ide_dma_write : ide_dma_read, drive);
#endif /* CONFIG_BLK_DEV_IDEDMA */

        if (IDE_CONTROL_REG)
                OUT_BYTE (drive->ctl,IDE_CONTROL_REG);
        OUT_BYTE (dma_ok ? 1:0,IDE_FEATURE_REG);                        /* Use PIO/DMA */
        OUT_BYTE (bcount.b.high,IDE_BCOUNTH_REG);
        OUT_BYTE (bcount.b.low,IDE_BCOUNTL_REG);
        OUT_BYTE (drive->select.all,IDE_SELECT_REG);

#ifdef CONFIG_BLK_DEV_IDEDMA
        if (dma_ok) {                                                   /* Begin DMA, if necessary */
                set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
                (void) (HWIF(drive)->dmaproc(ide_dma_begin, drive));
        }
#endif /* CONFIG_BLK_DEV_IDEDMA */

        if (test_bit (IDEFLOPPY_DRQ_INTERRUPT, &floppy->flags)) {
                ide_set_handler (drive, &idefloppy_transfer_pc, IDEFLOPPY_WAIT_CMD);
                OUT_BYTE (WIN_PACKETCMD, IDE_COMMAND_REG);              /* Issue the packet command */
        } else {
                OUT_BYTE (WIN_PACKETCMD, IDE_COMMAND_REG);
                idefloppy_transfer_pc (drive);
        }
}

static void idefloppy_rw_callback (ide_drive_t *drive)
{
#if IDEFLOPPY_DEBUG_LOG 
        printk (KERN_INFO "ide-floppy: Reached idefloppy_rw_callback\n");
#endif /* IDEFLOPPY_DEBUG_LOG */

        idefloppy_end_request(1, HWGROUP(drive));
        return;
}

static void idefloppy_create_prevent_cmd (idefloppy_pc_t *pc, int prevent)
{
#if IDEFLOPPY_DEBUG_LOG
        printk (KERN_INFO "ide-floppy: creating prevent removal command, prevent = %d\n", prevent);
#endif /* IDEFLOPPY_DEBUG_LOG */

        idefloppy_init_pc (pc);
        pc->c[0] = IDEFLOPPY_PREVENT_REMOVAL_CMD;
        pc->c[4] = prevent;
}

static void idefloppy_create_read_capacity_cmd (idefloppy_pc_t *pc)
{
        idefloppy_init_pc (pc);
        pc->c[0] = IDEFLOPPY_READ_CAPACITY_CMD;
        pc->c[7] = 255;
        pc->c[8] = 255;
        pc->request_transfer = 255;
}

/*
 *      A mode sense command is used to "sense" floppy parameters.
 */
static void idefloppy_create_mode_sense_cmd (idefloppy_pc_t *pc, byte page_code, byte type)
{
        unsigned short length = sizeof (idefloppy_mode_parameter_header_t);
        
        idefloppy_init_pc (pc);
        pc->c[0] = IDEFLOPPY_MODE_SENSE_CMD;
        pc->c[1] = 0;
        pc->c[2] = page_code + (type << 6);

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

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

static void idefloppy_create_test_unit_ready_cmd(idefloppy_pc_t *pc)
{
        idefloppy_init_pc(pc);
        pc->c[0] = IDEFLOPPY_TEST_UNIT_READY_CMD;
}

static void idefloppy_create_rw_cmd (idefloppy_floppy_t *floppy, idefloppy_pc_t *pc, struct request *rq, unsigned long sector)
{
        int block = sector / floppy->bs_factor;
        int blocks = rq->nr_sectors / floppy->bs_factor;
        
#if IDEFLOPPY_DEBUG_LOG
        printk ("create_rw1%d_cmd: block == %d, blocks == %d\n",
                2 * test_bit (IDEFLOPPY_USE_READ12, &floppy->flags), block, blocks);
#endif /* IDEFLOPPY_DEBUG_LOG */

        idefloppy_init_pc (pc);
        if (test_bit (IDEFLOPPY_USE_READ12, &floppy->flags)) {
                pc->c[0] = rq->cmd == READ ? IDEFLOPPY_READ12_CMD : IDEFLOPPY_WRITE12_CMD;
                put_unaligned (htonl (blocks), (unsigned int *) &pc->c[6]);
        } else {
                pc->c[0] = rq->cmd == READ ? IDEFLOPPY_READ10_CMD : IDEFLOPPY_WRITE10_CMD;
                put_unaligned (htons (blocks), (unsigned short *) &pc->c[7]);
        }
        put_unaligned (htonl (block), (unsigned int *) &pc->c[2]);
        pc->callback = &idefloppy_rw_callback;
        pc->rq = rq;
        pc->b_data = rq->buffer;
        pc->b_count = rq->cmd == READ ? 0 : rq->bh->b_size;
        if (rq->cmd == WRITE)
                set_bit (PC_WRITING, &pc->flags);
        pc->buffer = NULL;
        pc->request_transfer = pc->buffer_size = blocks * floppy->block_size;
        set_bit (PC_DMA_RECOMMENDED, &pc->flags);
}

/*
 *      idefloppy_do_request is our request handling function.  
 */
static void idefloppy_do_request (ide_drive_t *drive, struct request *rq, unsigned long block)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        idefloppy_pc_t *pc;

#if IDEFLOPPY_DEBUG_LOG
        printk (KERN_INFO "rq_status: %d, rq_dev: %u, cmd: %d, errors: %d\n",rq->rq_status,(unsigned int) rq->rq_dev,rq->cmd,rq->errors);
        printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %ld\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
#endif /* IDEFLOPPY_DEBUG_LOG */

        if (rq->errors >= ERROR_MAX) {
                if (floppy->failed_pc != NULL)
                        printk (KERN_ERR "ide-floppy: %s: I/O error, pc = %2x, key = %2x, asc = %2x, ascq = %2x\n",
                                drive->name, floppy->failed_pc->c[0], floppy->sense_key, floppy->asc, floppy->ascq);
                else
                        printk (KERN_ERR "ide-floppy: %s: I/O error\n", drive->name);
                idefloppy_end_request (0, HWGROUP(drive));
                return;
        }
        switch (rq->cmd) {
                case READ:
                case WRITE:
                        if (rq->sector % floppy->bs_factor || rq->nr_sectors % floppy->bs_factor) {
                                printk ("%s: unsupported r/w request size\n", drive->name);
                                idefloppy_end_request (0, HWGROUP(drive));
                                return;
                        }
                        pc = idefloppy_next_pc_storage (drive);
                        idefloppy_create_rw_cmd (floppy, pc, rq, block);
                        break;
                case IDEFLOPPY_PC_RQ:
                        pc = (idefloppy_pc_t *) rq->buffer;
                        break;
                default:
                        printk (KERN_ERR "ide-floppy: unsupported command %x in request queue\n", rq->cmd);
                        idefloppy_end_request (0,HWGROUP (drive));
                        return;
        }
        pc->rq = rq;
        idefloppy_issue_pc (drive, pc);
}

/*
 *      idefloppy_queue_pc_tail adds a special packet command request to the
 *      tail of the request queue, and waits for it to be serviced.
 */
static int idefloppy_queue_pc_tail (ide_drive_t *drive,idefloppy_pc_t *pc)
{
        struct request rq;

        ide_init_drive_cmd (&rq);
        rq.buffer = (char *) pc;
        rq.cmd = IDEFLOPPY_PC_RQ;
        return ide_do_drive_cmd (drive, &rq, ide_wait);
}

/*
 *      Look at the flexible disk page parameters. We will ignore the CHS
 *      capacity parameters and use the LBA parameters instead.
 */
static int idefloppy_get_flexible_disk_page (ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        idefloppy_pc_t pc;
        idefloppy_mode_parameter_header_t *header;
        idefloppy_flexible_disk_page_t *page;
        int capacity, lba_capacity;

        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");
                return 1;
        }
        header = (idefloppy_mode_parameter_header_t *) pc.buffer;
        floppy->wp = header->wp;
        page = (idefloppy_flexible_disk_page_t *) (header + 1);

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

        floppy->flexible_disk_page = *page;
        drive->bios_cyl = page->cyls;
        drive->bios_head = page->heads;
        drive->bios_sect = page->sectors;
        lba_capacity = floppy->blocks * floppy->block_size;
        if (capacity != lba_capacity) {
                printk (KERN_NOTICE "%s: The drive reports both %d and %d bytes as its capacity\n",
                        drive->name, capacity, lba_capacity);
                capacity = IDEFLOPPY_MIN(capacity, lba_capacity);
                floppy->blocks = floppy->block_size ? capacity / floppy->block_size : 0;
        }
        return 0;
}

/*
 *      Determine if a media is present in the floppy drive, and if so,
 *      its LBA capacity.
 */
static int idefloppy_get_capacity (ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        idefloppy_pc_t pc;
        idefloppy_capacity_header_t *header;
        idefloppy_capacity_descriptor_t *descriptor;
        int i, descriptors, rc = 1, blocks, length;
        
        drive->bios_cyl = 0;
        drive->bios_head = drive->bios_sect = 0;
        floppy->blocks = floppy->bs_factor = 0;
        drive->part[0].nr_sects = 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;
        }
        header = (idefloppy_capacity_header_t *) pc.buffer;
        descriptors = header->length / sizeof (idefloppy_capacity_descriptor_t);
        descriptor = (idefloppy_capacity_descriptor_t *) (header + 1);
        for (i = 0; i < descriptors; i++, descriptor++) {
                blocks = descriptor->blocks = ntohl (descriptor->blocks);
                length = descriptor->length = ntohs (descriptor->length);
                if (!i && descriptor->dc == CAPACITY_CURRENT) {
                        if (memcmp (descriptor, &floppy->capacity, sizeof (idefloppy_capacity_descriptor_t)))
                                printk (KERN_INFO "%s: %dkB, %d blocks, %d sector size\n", drive->name, blocks * length / 1024, blocks, length);
                        floppy->capacity = *descriptor;
                        if (!length || length % 512)
                                printk (KERN_ERR "%s: %d bytes block size not supported\n", drive->name, length);
                        else {
                                floppy->blocks = blocks;
                                floppy->block_size = length;
                                if ((floppy->bs_factor = length / 512) != 1)
                                        printk (KERN_NOTICE "%s: warning: non 512 bytes block size not fully supported\n", drive->name);
                                rc = 0;
                        }
                }
#if IDEFLOPPY_DEBUG_INFO
                if (!i) printk (KERN_INFO "Descriptor 0 Code: %d\n", descriptor->dc);
                printk (KERN_INFO "Descriptor %d: %dkB, %d blocks, %d sector size\n", i, blocks * length / 1024, blocks, length);
#endif /* IDEFLOPPY_DEBUG_INFO */
        }
        (void) idefloppy_get_flexible_disk_page (drive);
        drive->part[0].nr_sects = floppy->blocks * floppy->bs_factor;
        return rc;
}

/*
 *      Our special ide-floppy ioctl's.
 *
 *      Currently there aren't any ioctl's.
 */
static int idefloppy_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file,
                                 unsigned int cmd, unsigned long arg)
{
        idefloppy_pc_t pc;

        if (cmd == CDROMEJECT) {
                if (drive->usage > 1)
                        return -EBUSY;
                idefloppy_create_prevent_cmd (&pc, 0);
                (void) idefloppy_queue_pc_tail (drive, &pc);
                idefloppy_create_start_stop_cmd (&pc, 2);
                (void) idefloppy_queue_pc_tail (drive, &pc);
                return 0;
        }
        return -EIO;
}

/*
 *      Our open/release functions
 */
static int idefloppy_open (struct inode *inode, struct file *filp, ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        idefloppy_pc_t pc;
        
#if IDEFLOPPY_DEBUG_LOG
        printk (KERN_INFO "Reached idefloppy_open\n");
#endif /* IDEFLOPPY_DEBUG_LOG */

        MOD_INC_USE_COUNT;
        if (drive->usage == 1) {
                idefloppy_create_test_unit_ready_cmd(&pc);
                if (idefloppy_queue_pc_tail(drive, &pc)) {
                        idefloppy_create_start_stop_cmd (&pc, 1);
                        (void) idefloppy_queue_pc_tail (drive, &pc);
                }
                if (idefloppy_get_capacity (drive)) {
                        drive->usage--;
                        MOD_DEC_USE_COUNT;
                        return -EIO;
                }
                if (floppy->wp && (filp->f_mode & 2)) {
                        drive->usage--;
                        MOD_DEC_USE_COUNT;
                        return -EROFS;
                }               
                set_bit (IDEFLOPPY_MEDIA_CHANGED, &floppy->flags);
                idefloppy_create_prevent_cmd (&pc, 1);
                (void) idefloppy_queue_pc_tail (drive, &pc);
                check_disk_change(inode->i_rdev);
        }
        return 0;
}

static void idefloppy_release (struct inode *inode, struct file *filp, ide_drive_t *drive)
{
        idefloppy_pc_t pc;
        
#if IDEFLOPPY_DEBUG_LOG
        printk (KERN_INFO "Reached idefloppy_release\n");
#endif /* IDEFLOPPY_DEBUG_LOG */

        if (!drive->usage) {
                invalidate_buffers (inode->i_rdev);
                idefloppy_create_prevent_cmd (&pc, 0);
                (void) idefloppy_queue_pc_tail (drive, &pc);
        }
        MOD_DEC_USE_COUNT;
}

/*
 *      Check media change. Use a simple algorithm for now.
 */
static int idefloppy_media_change (ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        
        return test_and_clear_bit (IDEFLOPPY_MEDIA_CHANGED, &floppy->flags);
}

/*
 *      Return the current floppy capacity to ide.c.
 */
static unsigned long idefloppy_capacity (ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        unsigned long capacity = floppy->blocks * floppy->bs_factor;

        return capacity;
}

/*
 *      idefloppy_identify_device checks if we can support a drive,
 *      based on the ATAPI IDENTIFY command results.
 */
static int idefloppy_identify_device (ide_drive_t *drive,struct hd_driveid *id)
{
        struct idefloppy_id_gcw gcw;
#if IDEFLOPPY_DEBUG_INFO
        unsigned short mask,i;
        char buffer[80];
#endif /* IDEFLOPPY_DEBUG_INFO */

        *((unsigned short *) &gcw) = id->config;

#if IDEFLOPPY_DEBUG_INFO
        printk (KERN_INFO "Dumping ATAPI Identify Device floppy parameters\n");
        switch (gcw.protocol) {
                case 0: case 1: sprintf (buffer, "ATA");break;
                case 2: sprintf (buffer, "ATAPI");break;
                case 3: sprintf (buffer, "Reserved (Unknown to ide-floppy)");break;
        }
        printk (KERN_INFO "Protocol Type: %s\n", buffer);
        switch (gcw.device_type) {
                case 0: sprintf (buffer, "Direct-access Device");break;
                case 1: sprintf (buffer, "Streaming Tape Device");break;
                case 2: case 3: case 4: sprintf (buffer, "Reserved");break;
                case 5: sprintf (buffer, "CD-ROM Device");break;
                case 6: sprintf (buffer, "Reserved");
                case 7: sprintf (buffer, "Optical memory Device");break;
                case 0x1f: sprintf (buffer, "Unknown or no Device type");break;
                default: sprintf (buffer, "Reserved");
        }
        printk (KERN_INFO "Device Type: %x - %s\n", gcw.device_type, buffer);
        printk (KERN_INFO "Removable: %s\n",gcw.removable ? "Yes":"No");        
        switch (gcw.drq_type) {
                case 0: sprintf (buffer, "Microprocessor DRQ");break;
                case 1: sprintf (buffer, "Interrupt DRQ");break;
                case 2: sprintf (buffer, "Accelerated DRQ");break;
                case 3: sprintf (buffer, "Reserved");break;
        }
        printk (KERN_INFO "Command Packet DRQ Type: %s\n", buffer);
        switch (gcw.packet_size) {
                case 0: sprintf (buffer, "12 bytes");break;
                case 1: sprintf (buffer, "16 bytes");break;
                default: sprintf (buffer, "Reserved");break;
        }
        printk (KERN_INFO "Command Packet Size: %s\n", buffer);
        printk (KERN_INFO "Model: %.40s\n",id->model);
        printk (KERN_INFO "Firmware Revision: %.8s\n",id->fw_rev);
        printk (KERN_INFO "Serial Number: %.20s\n",id->serial_no);
        printk (KERN_INFO "Write buffer size(?): %d bytes\n",id->buf_size*512);
        printk (KERN_INFO "DMA: %s",id->capability & 0x01 ? "Yes\n":"No\n");
        printk (KERN_INFO "LBA: %s",id->capability & 0x02 ? "Yes\n":"No\n");
        printk (KERN_INFO "IORDY can be disabled: %s",id->capability & 0x04 ? "Yes\n":"No\n");
        printk (KERN_INFO "IORDY supported: %s",id->capability & 0x08 ? "Yes\n":"Unknown\n");
        printk (KERN_INFO "ATAPI overlap supported: %s",id->capability & 0x20 ? "Yes\n":"No\n");
        printk (KERN_INFO "PIO Cycle Timing Category: %d\n",id->tPIO);
        printk (KERN_INFO "DMA Cycle Timing Category: %d\n",id->tDMA);
        printk (KERN_INFO "Single Word DMA supported modes:\n");
        for (i=0,mask=1;i<8;i++,mask=mask << 1) {
                if (id->dma_1word & mask)
                        printk (KERN_INFO "   Mode %d%s\n", i, (id->dma_1word & (mask << 8)) ? " (active)" : "");
        }
        printk (KERN_INFO "Multi Word DMA supported modes:\n");
        for (i=0,mask=1;i<8;i++,mask=mask << 1) {
                if (id->dma_mword & mask)
                        printk (KERN_INFO "   Mode %d%s\n", i, (id->dma_mword & (mask << 8)) ? " (active)" : "");
        }
        if (id->field_valid & 0x0002) {
                printk (KERN_INFO "Enhanced PIO Modes: %s\n",id->eide_pio_modes & 1 ? "Mode 3":"None");
                if (id->eide_dma_min == 0)
                        sprintf (buffer, "Not supported");
                else
                        sprintf (buffer, "%d ns",id->eide_dma_min);
                printk (KERN_INFO "Minimum Multi-word DMA cycle per word: %s\n", buffer);
                if (id->eide_dma_time == 0)
                        sprintf (buffer, "Not supported");
                else
                        sprintf (buffer, "%d ns",id->eide_dma_time);
                printk (KERN_INFO "Manufacturer\'s Recommended Multi-word cycle: %s\n", buffer);
                if (id->eide_pio == 0)
                        sprintf (buffer, "Not supported");
                else
                        sprintf (buffer, "%d ns",id->eide_pio);
                printk (KERN_INFO "Minimum PIO cycle without IORDY: %s\n", buffer);
                if (id->eide_pio_iordy == 0)
                        sprintf (buffer, "Not supported");
                else
                        sprintf (buffer, "%d ns",id->eide_pio_iordy);
                printk (KERN_INFO "Minimum PIO cycle with IORDY: %s\n", buffer);
        } else
                printk (KERN_INFO "According to the device, fields 64-70 are not valid.\n");
#endif /* IDEFLOPPY_DEBUG_INFO */

        if (gcw.protocol != 2)
                printk (KERN_ERR "ide-floppy: Protocol is not ATAPI\n");
        else if (gcw.device_type != 0)
                printk (KERN_ERR "ide-floppy: Device type is not set to floppy\n");
        else if (!gcw.removable)
                printk (KERN_ERR "ide-floppy: The removable flag is not set\n");
        else if (gcw.drq_type == 3) {
                printk (KERN_ERR "ide-floppy: Sorry, DRQ type %d not supported\n", gcw.drq_type);
        } else if (gcw.packet_size != 0) {
                printk (KERN_ERR "ide-floppy: Packet size is not 12 bytes long\n");
        } else
                return 1;
        return 0;
}

static void idefloppy_add_settings(ide_drive_t *drive)
{
        int major = HWIF(drive)->major;
        int minor = drive->select.b.unit << PARTN_BITS;

        ide_add_setting(drive,  "bios_cyl",             SETTING_RW,                                     -1,                     -1,                     TYPE_SHORT,     0,      1023,                           1,      1,      &drive->bios_cyl,               NULL);
        ide_add_setting(drive,  "bios_head",            SETTING_RW,                                     -1,                     -1,                     TYPE_BYTE,      0,      255,                            1,      1,      &drive->bios_head,              NULL);
        ide_add_setting(drive,  "bios_sect",            SETTING_RW,                                     -1,                     -1,                     TYPE_BYTE,      0,      63,                             1,      1,      &drive->bios_sect,              NULL);
        ide_add_setting(drive,  "breada_readahead",     SETTING_RW,                                     BLKRAGET,               BLKRASET,               TYPE_INT,       0,      255,                            1,      2,      &read_ahead[major],             NULL);
        ide_add_setting(drive,  "file_readahead",       SETTING_RW,                                     BLKFRAGET,              BLKFRASET,              TYPE_INTA,      0,      INT_MAX,                        1,      1024,   &max_readahead[major][minor],   NULL);
        ide_add_setting(drive,  "max_kb_per_request",   SETTING_RW,                                     BLKSECTGET,             BLKSECTSET,             TYPE_INTA,      1,      255,                            1,      2,      &max_sectors[major][minor],     NULL);

}

/*
 *      Driver initialization.
 */
static void idefloppy_setup (ide_drive_t *drive, idefloppy_floppy_t *floppy)
{
        struct idefloppy_id_gcw gcw;
        int major = HWIF(drive)->major, i;
        int minor = drive->select.b.unit << PARTN_BITS;

        *((unsigned short *) &gcw) = drive->id->config;
        drive->driver_data = floppy;
        drive->ready_stat = 0;
        memset (floppy, 0, sizeof (idefloppy_floppy_t));
        floppy->drive = drive;
        floppy->pc = floppy->pc_stack;
        if (gcw.drq_type == 1)
                set_bit (IDEFLOPPY_DRQ_INTERRUPT, &floppy->flags);
        if (strcmp(drive->id->model, "IOMEGA ZIP 100 ATAPI") == 0 &&
            ((strcmp(drive->id->fw_rev, "21.D") == 0) ||
             (strcmp(drive->id->fw_rev, "23.D") == 0))) {
                for (i = 0; i < 1 << PARTN_BITS; i++)
                        max_sectors[major][minor + i] = 64;
        }

        (void) idefloppy_get_capacity (drive);
        idefloppy_add_settings(drive);
}

static int idefloppy_cleanup (ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;

        if (ide_unregister_subdriver (drive))
                return 1;
        drive->driver_data = NULL;
        kfree (floppy);
        return 0;
}

#ifdef CONFIG_PROC_FS

static ide_proc_entry_t idefloppy_proc[] = {
        { "geometry",   S_IFREG|S_IRUGO,        proc_ide_read_geometry, NULL },
        { NULL, 0, NULL, NULL }
};

#else

#define idefloppy_proc  NULL

#endif  /* CONFIG_PROC_FS */

/*
 *      IDE subdriver functions, registered with ide.c
 */
static ide_driver_t idefloppy_driver = {
        "ide-floppy",           /* name */
        IDEFLOPPY_VERSION,      /* version */
        ide_floppy,             /* media */
        0,                      /* busy */
        1,                      /* supports_dma */
        0,                      /* supports_dsc_overlap */
        idefloppy_cleanup,      /* cleanup */
        idefloppy_do_request,   /* do_request */
        idefloppy_end_request,  /* end_request */
        idefloppy_ioctl,        /* ioctl */
        idefloppy_open,         /* open */
        idefloppy_release,      /* release */
        idefloppy_media_change, /* media_change */
        NULL,                   /* pre_reset */
        idefloppy_capacity,     /* capacity */
        NULL,                   /* special */
        idefloppy_proc          /* proc */
};

int idefloppy_init (void);
static ide_module_t idefloppy_module = {
        IDE_DRIVER_MODULE,
        idefloppy_init,
        &idefloppy_driver,
        NULL
};

/*
 *      idefloppy_init will register the driver for each floppy.
 */
int idefloppy_init (void)
{
        ide_drive_t *drive;
        idefloppy_floppy_t *floppy;
        int failed = 0;

        MOD_INC_USE_COUNT;
        while ((drive = ide_scan_devices (ide_floppy, idefloppy_driver.name, NULL, failed++)) != NULL) {
                if (!idefloppy_identify_device (drive, drive->id)) {
                        printk (KERN_ERR "ide-floppy: %s: not supported by this version of ide-floppy\n", drive->name);
                        continue;
                }
                if ((floppy = (idefloppy_floppy_t *) kmalloc (sizeof (idefloppy_floppy_t), GFP_KERNEL)) == NULL) {
                        printk (KERN_ERR "ide-floppy: %s: Can't allocate a floppy structure\n", drive->name);
                        continue;
                }
                if (ide_register_subdriver (drive, &idefloppy_driver, IDE_SUBDRIVER_VERSION)) {
                        printk (KERN_ERR "ide-floppy: %s: Failed to register the driver with ide.c\n", drive->name);
                        kfree (floppy);
                        continue;
                }
                idefloppy_setup (drive, floppy);
                failed--;
        }
        ide_register_module(&idefloppy_module);
        MOD_DEC_USE_COUNT;
        return 0;
}

#ifdef MODULE
int init_module (void)
{
        return idefloppy_init ();
}

void cleanup_module (void)
{
        ide_drive_t *drive;
        int failed = 0;

        while ((drive = ide_scan_devices (ide_floppy, idefloppy_driver.name, &idefloppy_driver, failed)) != NULL) {
                if (idefloppy_cleanup (drive)) {
                        printk ("%s: cleanup_module() called while still busy\n", drive->name);
                        failed++;
                }
                /* We must remove proc entries defined in this module.
                   Otherwise we oops while accessing these entries */
                if (drive->proc)
                        ide_remove_proc_entries(drive->proc, idefloppy_proc);
        }
        ide_unregister_module(&idefloppy_module);
}
#endif /* MODULE */