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/*
* $Header: /cvsroot/osst/Driver/osst.h,v 1.16 2005/01/01 21:13:35 wriede Exp $
*/

#include <asm/byteorder.h>
#include <linux/completion.h>
#include <linux/mutex.h>

/* FIXME - rename and use the following two types or delete them!
* and the types really should go to st.h anyway...
* INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C)
*/
typedef struct {
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 */
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 */
} idetape_inquiry_result_t;

/*
* READ POSITION packet command - Data Format (From Table 6-57)
*/
typedef struct {
unsigned reserved0_10 :2; /* Reserved */
unsigned bpu :1; /* Block Position Unknown */
unsigned reserved0_543 :3; /* Reserved */
unsigned eop :1; /* End Of Partition */
unsigned bop :1; /* Beginning Of Partition */
u8 partition; /* Partition Number */
u8 reserved2, reserved3; /* Reserved */
u32 first_block; /* First Block Location */
u32 last_block; /* Last Block Location (Optional) */
u8 reserved12; /* Reserved */
u8 blocks_in_buffer[3]; /* Blocks In Buffer - (Optional) */
u32 bytes_in_buffer; /* Bytes In Buffer (Optional) */
} idetape_read_position_result_t;

/*
* Follows structures which are related to the SELECT SENSE / MODE SENSE
* packet commands.
*/
#define COMPRESSION_PAGE 0x0f
#define COMPRESSION_PAGE_LENGTH 16

#define CAPABILITIES_PAGE 0x2a
#define CAPABILITIES_PAGE_LENGTH 20

#define TAPE_PARAMTR_PAGE 0x2b
#define TAPE_PARAMTR_PAGE_LENGTH 16

#define NUMBER_RETRIES_PAGE 0x2f
#define NUMBER_RETRIES_PAGE_LENGTH 4

#define BLOCK_SIZE_PAGE 0x30
#define BLOCK_SIZE_PAGE_LENGTH 4

#define BUFFER_FILLING_PAGE 0x33
#define BUFFER_FILLING_PAGE_LENGTH 4

#define VENDOR_IDENT_PAGE 0x36
#define VENDOR_IDENT_PAGE_LENGTH 8

#define LOCATE_STATUS_PAGE 0x37
#define LOCATE_STATUS_PAGE_LENGTH 0

#define MODE_HEADER_LENGTH 4


/*
* REQUEST SENSE packet command result - Data Format.
*/
typedef struct {
unsigned error_code :7; /* Current of deferred errors */
unsigned valid :1; /* The information field conforms to QIC-157C */
u8 reserved1 :8; /* Segment Number - Reserved */
unsigned sense_key :4; /* Sense Key */
unsigned reserved2_4 :1; /* Reserved */
unsigned ili :1; /* Incorrect Length Indicator */
unsigned eom :1; /* End Of Medium */
unsigned filemark :1; /* Filemark */
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 */
unsigned sk_specific1 :7; /* Sense Key Specific */
unsigned sksv :1; /* Sense Key Specific information is valid */
u8 sk_specific2; /* Sense Key Specific */
u8 sk_specific3; /* Sense Key Specific */
u8 pad[2]; /* Padding to 20 bytes */
} idetape_request_sense_result_t;

/*
* Mode Parameter Header for the MODE SENSE packet command
*/
typedef struct {
        u8 mode_data_length; /* Length of the following data transfer */
        u8 medium_type; /* Medium Type */
        u8 dsp; /* Device Specific Parameter */
        u8 bdl; /* Block Descriptor Length */
} osst_mode_parameter_header_t;

/*
* Mode Parameter Block Descriptor the MODE SENSE packet command
*
* Support for block descriptors is optional.
*/
typedef struct {
        u8 density_code; /* Medium density code */
        u8 blocks[3]; /* Number of blocks */
        u8 reserved4; /* Reserved */
        u8 length[3]; /* Block Length */
} osst_parameter_block_descriptor_t;

/*
* The Data Compression Page, as returned by the MODE SENSE packet command.
*/
typedef struct {
#if defined(__BIG_ENDIAN_BITFIELD)
        unsigned ps :1;
        unsigned reserved0 :1; /* Reserved */
unsigned page_code :6; /* Page Code - Should be 0xf */
#elif defined(__LITTLE_ENDIAN_BITFIELD)
unsigned page_code :6; /* Page Code - Should be 0xf */
        unsigned reserved0 :1; /* Reserved */
        unsigned ps :1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
        u8 page_length; /* Page Length - Should be 14 */
#if defined(__BIG_ENDIAN_BITFIELD)
        unsigned dce :1; /* Data Compression Enable */
        unsigned dcc :1; /* Data Compression Capable */
unsigned reserved2 :6; /* Reserved */
#elif defined(__LITTLE_ENDIAN_BITFIELD)
unsigned reserved2 :6; /* Reserved */
        unsigned dcc :1; /* Data Compression Capable */
        unsigned dce :1; /* Data Compression Enable */
#else
#error "Please fix <asm/byteorder.h>"
#endif
#if defined(__BIG_ENDIAN_BITFIELD)
        unsigned dde :1; /* Data Decompression Enable */
        unsigned red :2; /* Report Exception on Decompression */
unsigned reserved3 :5; /* Reserved */
#elif defined(__LITTLE_ENDIAN_BITFIELD)
unsigned reserved3 :5; /* Reserved */
        unsigned red :2; /* Report Exception on Decompression */
        unsigned dde :1; /* Data Decompression Enable */
#else
#error "Please fix <asm/byteorder.h>"
#endif
        u32 ca; /* Compression Algorithm */
        u32 da; /* Decompression Algorithm */
        u8 reserved[4]; /* Reserved */
} osst_data_compression_page_t;

/*
* The Medium Partition Page, as returned by the MODE SENSE packet command.
*/
typedef struct {
#if defined(__BIG_ENDIAN_BITFIELD)
        unsigned ps :1;
        unsigned reserved1_6 :1; /* Reserved */
unsigned page_code :6; /* Page Code - Should be 0x11 */
#elif defined(__LITTLE_ENDIAN_BITFIELD)
unsigned page_code :6; /* Page Code - Should be 0x11 */
        unsigned reserved1_6 :1; /* Reserved */
        unsigned ps :1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
        u8 page_length; /* Page Length - Should be 6 */
        u8 map; /* Maximum Additional Partitions - Should be 0 */
        u8 apd; /* Additional Partitions Defined - Should be 0 */
#if defined(__BIG_ENDIAN_BITFIELD)
        unsigned fdp :1; /* Fixed Data Partitions */
        unsigned sdp :1; /* Should be 0 */
        unsigned idp :1; /* Should be 0 */
        unsigned psum :2; /* Should be 0 */
unsigned reserved4_012 :3; /* Reserved */
#elif defined(__LITTLE_ENDIAN_BITFIELD)
unsigned reserved4_012 :3; /* Reserved */
        unsigned psum :2; /* Should be 0 */
        unsigned idp :1; /* Should be 0 */
        unsigned sdp :1; /* Should be 0 */
        unsigned fdp :1; /* Fixed Data Partitions */
#else
#error "Please fix <asm/byteorder.h>"
#endif
        u8 mfr; /* Medium Format Recognition */
        u8 reserved[2]; /* Reserved */
} osst_medium_partition_page_t;

/*
* Capabilities and Mechanical Status Page
*/
typedef struct {
#if defined(__BIG_ENDIAN_BITFIELD)
        unsigned reserved1_67 :2;
unsigned page_code :6; /* Page code - Should be 0x2a */
#elif defined(__LITTLE_ENDIAN_BITFIELD)
unsigned page_code :6; /* Page code - Should be 0x2a */
        unsigned reserved1_67 :2;
#else
#error "Please fix <asm/byteorder.h>"
#endif
        u8 page_length; /* Page Length - Should be 0x12 */
        u8 reserved2, reserved3;
#if defined(__BIG_ENDIAN_BITFIELD)
        unsigned reserved4_67 :2;
        unsigned sprev :1; /* Supports SPACE in the reverse direction */
        unsigned reserved4_1234 :4;
unsigned ro :1; /* Read Only Mode */
#elif defined(__LITTLE_ENDIAN_BITFIELD)
unsigned ro :1; /* Read Only Mode */
        unsigned reserved4_1234 :4;
        unsigned sprev :1; /* Supports SPACE in the reverse direction */
        unsigned reserved4_67 :2;
#else
#error "Please fix <asm/byteorder.h>"
#endif
#if defined(__BIG_ENDIAN_BITFIELD)
        unsigned reserved5_67 :2;
        unsigned qfa :1; /* Supports the QFA two partition formats */
        unsigned reserved5_4 :1;
        unsigned efmt :1; /* Supports ERASE command initiated formatting */
unsigned reserved5_012 :3;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
unsigned reserved5_012 :3;
        unsigned efmt :1; /* Supports ERASE command initiated formatting */
        unsigned reserved5_4 :1;
        unsigned qfa :1; /* Supports the QFA two partition formats */
        unsigned reserved5_67 :2;
#else
#error "Please fix <asm/byteorder.h>"
#endif
#if defined(__BIG_ENDIAN_BITFIELD)
        unsigned cmprs :1; /* Supports data compression */
        unsigned ecc :1; /* Supports error correction */
unsigned reserved6_45 :2; /* Reserved */
        unsigned eject :1; /* The device can eject the volume */
        unsigned prevent :1; /* The device defaults in the prevent state after power up */
        unsigned locked :1; /* The volume is locked */
unsigned lock :1; /* Supports locking the volume */
#elif defined(__LITTLE_ENDIAN_BITFIELD)
unsigned lock :1; /* Supports locking the volume */
        unsigned locked :1; /* The volume is locked */
        unsigned prevent :1; /* The device defaults in the prevent state after power up */
        unsigned eject :1; /* The device can eject the volume */
unsigned reserved6_45 :2; /* Reserved */
        unsigned ecc :1; /* Supports error correction */
        unsigned cmprs :1; /* Supports data compression */
#else
#error "Please fix <asm/byteorder.h>"
#endif
#if defined(__BIG_ENDIAN_BITFIELD)
        unsigned blk32768 :1; /* slowb - the device restricts the byte count for PIO */
                                                /* transfers for slow buffer memory ??? */
                                                /* Also 32768 block size in some cases */
        unsigned reserved7_3_6 :4;
        unsigned blk1024 :1; /* Supports 1024 bytes block size */
        unsigned blk512 :1; /* Supports 512 bytes block size */
unsigned reserved7_0 :1;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
unsigned reserved7_0 :1;
        unsigned blk512 :1; /* Supports 512 bytes block size */
        unsigned blk1024 :1; /* Supports 1024 bytes block size */
        unsigned reserved7_3_6 :4;
        unsigned blk32768 :1; /* slowb - the device restricts the byte count for PIO */
                                                /* transfers for slow buffer memory ??? */
                                                /* Also 32768 block size in some cases */
#else
#error "Please fix <asm/byteorder.h>"
#endif
        __be16 max_speed; /* Maximum speed supported in KBps */
        u8 reserved10, reserved11;
        __be16 ctl; /* Continuous Transfer Limit in blocks */
        __be16 speed; /* Current Speed, in KBps */
        __be16 buffer_size; /* Buffer Size, in 512 bytes */
        u8 reserved18, reserved19;
} osst_capabilities_page_t;

/*
* Block Size Page
*/
typedef struct {
#if defined(__BIG_ENDIAN_BITFIELD)
        unsigned ps :1;
        unsigned reserved1_6 :1;
unsigned page_code :6; /* Page code - Should be 0x30 */
#elif defined(__LITTLE_ENDIAN_BITFIELD)
unsigned page_code :6; /* Page code - Should be 0x30 */
        unsigned reserved1_6 :1;
        unsigned ps :1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
        u8 page_length; /* Page Length - Should be 2 */
        u8 reserved2;
#if defined(__BIG_ENDIAN_BITFIELD)
        unsigned one :1;
        unsigned reserved2_6 :1;
        unsigned record32_5 :1;
        unsigned record32 :1;
        unsigned reserved2_23 :2;
        unsigned play32_5 :1;
unsigned play32 :1;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
unsigned play32 :1;
        unsigned play32_5 :1;
        unsigned reserved2_23 :2;
        unsigned record32 :1;
        unsigned record32_5 :1;
        unsigned reserved2_6 :1;
        unsigned one :1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
} osst_block_size_page_t;

/*
* Tape Parameters Page
*/
typedef struct {
#if defined(__BIG_ENDIAN_BITFIELD)
        unsigned ps :1;
        unsigned reserved1_6 :1;
unsigned page_code :6; /* Page code - Should be 0x2b */
#elif defined(__LITTLE_ENDIAN_BITFIELD)
unsigned page_code :6; /* Page code - Should be 0x2b */
        unsigned reserved1_6 :1;
        unsigned ps :1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
u8 reserved2;
u8 density;
u8 reserved3,reserved4;
__be16 segtrk;
__be16 trks;
u8 reserved5,reserved6,reserved7,reserved8,reserved9,reserved10;
} osst_tape_paramtr_page_t;

/* OnStream definitions */

#define OS_CONFIG_PARTITION (0xff)
#define OS_DATA_PARTITION (0)
#define OS_PARTITION_VERSION (1)

/*
* partition
*/
typedef struct os_partition_s {
        __u8 partition_num;
        __u8 par_desc_ver;
        __be16 wrt_pass_cntr;
        __be32 first_frame_ppos;
        __be32 last_frame_ppos;
        __be32 eod_frame_ppos;
} os_partition_t;

/*
* DAT entry
*/
typedef struct os_dat_entry_s {
        __be32 blk_sz;
        __be16 blk_cnt;
        __u8 flags;
        __u8 reserved;
} os_dat_entry_t;

/*
* DAT
*/
#define OS_DAT_FLAGS_DATA (0xc)
#define OS_DAT_FLAGS_MARK (0x1)

typedef struct os_dat_s {
        __u8 dat_sz;
        __u8 reserved1;
        __u8 entry_cnt;
        __u8 reserved3;
        os_dat_entry_t dat_list[16];
} os_dat_t;

/*
* Frame types
*/
#define OS_FRAME_TYPE_FILL (0)
#define OS_FRAME_TYPE_EOD (1 << 0)
#define OS_FRAME_TYPE_MARKER (1 << 1)
#define OS_FRAME_TYPE_HEADER (1 << 3)
#define OS_FRAME_TYPE_DATA (1 << 7)

/*
* AUX
*/
typedef struct os_aux_s {
        __be32 format_id; /* hardware compatibility AUX is based on */
        char application_sig[4]; /* driver used to write this media */
        __be32 hdwr; /* reserved */
        __be32 update_frame_cntr; /* for configuration frame */
        __u8 frame_type;
        __u8 frame_type_reserved;
        __u8 reserved_18_19[2];
        os_partition_t partition;
        __u8 reserved_36_43[8];
        __be32 frame_seq_num;
        __be32 logical_blk_num_high;
        __be32 logical_blk_num;
        os_dat_t dat;
        __u8 reserved188_191[4];
        __be32 filemark_cnt;
        __be32 phys_fm;
        __be32 last_mark_ppos;
        __u8 reserved204_223[20];

        /*
* __u8 app_specific[32];
*
* Linux specific fields:
*/
         __be32 next_mark_ppos; /* when known, points to next marker */
__be32 last_mark_lbn; /* storing log_blk_num of last mark is extends ADR spec */
         __u8 linux_specific[24];

        __u8 reserved_256_511[256];
} os_aux_t;

#define OS_FM_TAB_MAX 1024

typedef struct os_fm_tab_s {
__u8 fm_part_num;
__u8 reserved_1;
__u8 fm_tab_ent_sz;
__u8 reserved_3;
__be16 fm_tab_ent_cnt;
__u8 reserved6_15[10];
__be32 fm_tab_ent[OS_FM_TAB_MAX];
} os_fm_tab_t;

typedef struct os_ext_trk_ey_s {
__u8 et_part_num;
__u8 fmt;
__be16 fm_tab_off;
__u8 reserved4_7[4];
__be32 last_hlb_hi;
__be32 last_hlb;
__be32 last_pp;
__u8 reserved20_31[12];
} os_ext_trk_ey_t;

typedef struct os_ext_trk_tb_s {
__u8 nr_stream_part;
__u8 reserved_1;
__u8 et_ent_sz;
__u8 reserved3_15[13];
os_ext_trk_ey_t dat_ext_trk_ey;
os_ext_trk_ey_t qfa_ext_trk_ey;
} os_ext_trk_tb_t;

typedef struct os_header_s {
        char ident_str[8];
        __u8 major_rev;
        __u8 minor_rev;
__be16 ext_trk_tb_off;
        __u8 reserved12_15[4];
        __u8 pt_par_num;
        __u8 pt_reserved1_3[3];
        os_partition_t partition[16];
__be32 cfg_col_width;
__be32 dat_col_width;
__be32 qfa_col_width;
__u8 cartridge[16];
__u8 reserved304_511[208];
__be32 old_filemark_list[16680/4]; /* in ADR 1.4 __u8 track_table[16680] */
os_ext_trk_tb_t ext_track_tb;
__u8 reserved17272_17735[464];
os_fm_tab_t dat_fm_tab;
os_fm_tab_t qfa_fm_tab;
__u8 reserved25960_32767[6808];
} os_header_t;


/*
* OnStream ADRL frame
*/
#define OS_FRAME_SIZE (32 * 1024 + 512)
#define OS_DATA_SIZE (32 * 1024)
#define OS_AUX_SIZE (512)
//#define OSST_MAX_SG 2

/* The OnStream tape buffer descriptor. */
struct osst_buffer {
  unsigned char in_use;
  unsigned char dma; /* DMA-able buffer */
  int buffer_size;
  int buffer_blocks;
  int buffer_bytes;
  int read_pointer;
  int writing;
  int midlevel_result;
  int syscall_result;
  struct osst_request *last_SRpnt;
  struct st_cmdstatus cmdstat;
  struct rq_map_data map_data;
  unsigned char *b_data;
  os_aux_t *aux; /* onstream AUX structure at end of each block */
  unsigned short use_sg; /* zero or number of s/g segments for this adapter */
  unsigned short sg_segs; /* number of segments in s/g list */
  unsigned short orig_sg_segs; /* number of segments allocated at first try */
  struct scatterlist sg[1]; /* MUST BE last item */
} ;

/* The OnStream tape drive descriptor */
struct osst_tape {
  struct scsi_driver *driver;
  unsigned capacity;
  struct scsi_device *device;
  struct mutex lock; /* for serialization */
  struct completion wait; /* for SCSI commands */
  struct osst_buffer * buffer;

  /* Drive characteristics */
  unsigned char omit_blklims;
  unsigned char do_auto_lock;
  unsigned char can_bsr;
  unsigned char can_partitions;
  unsigned char two_fm;
  unsigned char fast_mteom;
  unsigned char restr_dma;
  unsigned char scsi2_logical;
  unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */
  unsigned char pos_unknown; /* after reset position unknown */
  int write_threshold;
  int timeout; /* timeout for normal commands */
  int long_timeout; /* timeout for commands known to take long time*/

  /* Mode characteristics */
  struct st_modedef modes[ST_NBR_MODES];
  int current_mode;

  /* Status variables */
  int partition;
  int new_partition;
  int nbr_partitions; /* zero until partition support enabled */
  struct st_partstat ps[ST_NBR_PARTITIONS];
  unsigned char dirty;
  unsigned char ready;
  unsigned char write_prot;
  unsigned char drv_write_prot;
  unsigned char in_use;
  unsigned char blksize_changed;
  unsigned char density_changed;
  unsigned char compression_changed;
  unsigned char drv_buffer;
  unsigned char density;
  unsigned char door_locked;
  unsigned char rew_at_close;
  unsigned char inited;
  int block_size;
  int min_block;
  int max_block;
  int recover_count; /* from tape opening */
  int abort_count;
  int write_count;
  int read_count;
  int recover_erreg; /* from last status call */
  /*
* OnStream specific data
*/
  int os_fw_rev; /* the firmware revision * 10000 */
  unsigned char raw; /* flag OnStream raw access (32.5KB block size) */
  unsigned char poll; /* flag that this drive needs polling (IDE|firmware) */
  unsigned char frame_in_buffer; /* flag that the frame as per frame_seq_number
* has been read into STp->buffer and is valid */
  int frame_seq_number; /* logical frame number */
  int logical_blk_num; /* logical block number */
  unsigned first_frame_position; /* physical frame to be transferred to/from host */
  unsigned last_frame_position; /* physical frame to be transferd to/from tape */
  int cur_frames; /* current number of frames in internal buffer */
  int max_frames; /* max number of frames in internal buffer */
  char application_sig[5]; /* application signature */
  unsigned char fast_open; /* flag that reminds us we didn't check headers at open */
  unsigned short wrt_pass_cntr; /* write pass counter */
  int update_frame_cntr; /* update frame counter */
  int onstream_write_error; /* write error recovery active */
  int header_ok; /* header frame verified ok */
  int linux_media; /* reading linux-specifc media */
  int linux_media_version;
  os_header_t * header_cache; /* cache is kept for filemark positions */
  int filemark_cnt;
  int first_mark_ppos;
  int last_mark_ppos;
  int last_mark_lbn; /* storing log_blk_num of last mark is extends ADR spec */
  int first_data_ppos;
  int eod_frame_ppos;
  int eod_frame_lfa;
  int write_type; /* used in write error recovery */
  int read_error_frame; /* used in read error recovery */
  unsigned long cmd_start_time;
  unsigned long max_cmd_time;

#if DEBUG
  unsigned char write_pending;
  int nbr_finished;
  int nbr_waits;
  unsigned char last_cmnd[6];
  unsigned char last_sense[16];
#endif
  struct gendisk *drive;
} ;

/* scsi tape command */
struct osst_request {
unsigned char cmd[MAX_COMMAND_SIZE];
unsigned char sense[SCSI_SENSE_BUFFERSIZE];
int result;
struct osst_tape *stp;
struct completion *waiting;
struct bio *bio;
};

/* Values of write_type */
#define OS_WRITE_DATA 0
#define OS_WRITE_EOD 1
#define OS_WRITE_NEW_MARK 2
#define OS_WRITE_LAST_MARK 3
#define OS_WRITE_HEADER 4
#define OS_WRITE_FILLER 5

/* Additional rw state */
#define OS_WRITING_COMPLETE 3
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