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/*

        paride.h        (c) 1997-8  Grant R. Guenther <grant@torque.net>

                                    Under the terms of the GPL.

   This file defines the interface between the high-level parallel

   IDE device drivers (pd, pf, pcd, pt) and the adapter chips.

*/

/* Changes:

        1.01    GRG 1998.05.05  init_proto, release_proto

*/

#define PARIDE_H_VERSION        "1.01"

/* Some adapters need to know what kind of device they are in

   Values for devtype:

*/

#define PI_PD   0        /* IDE disk */

#define PI_PCD  1       /* ATAPI CDrom */

#define PI_PF   2       /* ATAPI disk */

#define PI_PT   3       /* ATAPI tape */

#define PI_PG   4       /* ATAPI generic */

/* The paride module contains no state, instead the drivers allocate

   a pi_adapter data structure and pass it to paride in every operation.

*/

struct pi_adapter  {

        struct pi_protocol *proto;   /* adapter protocol */

        int     port;                /* base address of parallel port */

        int     mode;                /* transfer mode in use */

        int     delay;               /* adapter delay setting */

        int     devtype;             /* device type: PI_PD etc. */

        char    *device;             /* name of driver */

        int     unit;                /* unit number for chained adapters */

        int     saved_r0;            /* saved port state */

        int     saved_r2;            /* saved port state */

        int     reserved;            /* number of ports reserved */

        int     private;             /* for protocol module */

        struct wait_queue *parq;     /* semaphore for parport sharing */

        void    *pardev;             /* pointer to pardevice */

        char    *parname;            /* parport name */

        int     claimed;             /* parport has already been claimed */

        void (*claim_cont)(void);    /* continuation for parport wait */

};

typedef struct pi_adapter PIA;

/* functions exported by paride to the high level drivers */

extern int pi_init(PIA *pi,

        int autoprobe,          /* 1 to autoprobe */

        int port,               /* base port address */

        int mode,               /* -1 for autoprobe */

        int unit,               /* unit number, if supported */

        int protocol,           /* protocol to use */

        int delay,              /* -1 to use adapter specific default */

        char * scratch,         /* address of 512 byte buffer */

        int devtype,            /* device type: PI_PD, PI_PCD, etc ... */

        int verbose,            /* log verbose data while probing */

        char *device            /* name of the driver */

        );                      /* returns 0 on failure, 1 on success */

extern void pi_release(PIA *pi);

/* registers are addressed as (cont,regr)

        cont: 0 for command register file, 1 for control register(s)

        regr: 0-7 for register number.

*/

extern void pi_write_regr(PIA *pi, int cont, int regr, int val);

extern int pi_read_regr(PIA *pi, int cont, int regr);

extern void pi_write_block(PIA *pi, char * buf, int count);

extern void pi_read_block(PIA *pi, char * buf, int count);

extern void pi_connect(PIA *pi);

extern void pi_disconnect(PIA *pi);

extern void pi_do_claimed(PIA *pi, void (*cont)(void));

/* macros and functions exported to the protocol modules */

#define delay_p                 (pi->delay?udelay(pi->delay):0)

#define out_p(offs,byte)        outb(byte,pi->port+offs); delay_p;

#define in_p(offs)              (delay_p,inb(pi->port+offs))

#define w0(byte)                {out_p(0,byte);}

#define r0()                    (in_p(0) & 0xff)

#define w1(byte)                {out_p(1,byte);}

#define r1()                    (in_p(1) & 0xff)

#define w2(byte)                {out_p(2,byte);}

#define r2()                    (in_p(2) & 0xff)

#define w3(byte)                {out_p(3,byte);}

#define w4(byte)                {out_p(4,byte);}

#define r4()                    (in_p(4) & 0xff)

#define w4w(data)               {outw(data,pi->port+4); delay_p;}

#define w4l(data)               {outl(data,pi->port+4); delay_p;}

#define r4w()                   (delay_p,inw(pi->port+4)&0xffff)

#define r4l()                   (delay_p,inl(pi->port+4)&0xffffffff)

static inline u16 pi_swab16( char *b, int k)

{       union { u16 u; char t[2]; } r;

        r.t[0]=b[2*k+1]; r.t[1]=b[2*k];

        return r.u;

}

static inline u32 pi_swab32( char *b, int k)

{       union { u32 u; char f[4]; } r;

        r.f[0]=b[4*k+1]; r.f[1]=b[4*k];

        r.f[2]=b[4*k+3]; r.f[3]=b[4*k+2];

        return r.u;

}

struct pi_protocol {

        char    name[8];        /* name for this protocol */

        int     index;          /* index into protocol table */

        int     max_mode;       /* max mode number */

        int     epp_first;      /* modes >= this use 8 ports */

        int     default_delay;  /* delay parameter if not specified */

        int     max_units;      /* max chained units probed for */

        void (*write_regr)(PIA *,int,int,int);

        int  (*read_regr)(PIA *,int,int);

        void (*write_block)(PIA *,char *,int);

        void (*read_block)(PIA *,char *,int);

        void (*connect)(PIA *);

        void (*disconnect)(PIA *);

        int  (*test_port)(PIA *);

        int  (*probe_unit)(PIA *);

        int  (*test_proto)(PIA *,char *,int);

        void (*log_adapter)(PIA *,char *,int);

        void (*init_proto)(PIA *);

        void (*release_proto)(PIA *);

};

typedef struct pi_protocol PIP;

extern int pi_register( PIP * );

extern void pi_unregister ( PIP * );

/* end of paride.h */