paride.h

Linux块设备驱动源码

#ifndef __DRIVERS_PARIDE_H__
#define __DRIVERS_PARIDE_H__

/* 
	paride.h	(c) 1997-8  Grant R. Guenther <[e-mail]>
   		                    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 */
	unsigned long	private;     /* for protocol module */

	wait_queue_head_t 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));
extern int pi_schedule_claimed(PIA *pi, void (*cont)(void));

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

#define delay_p			(pi->delay?udelay(pi->delay):(void)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);
	
	int (*init_proto)(PIA *);
	void (*release_proto)(PIA *);
	struct module *owner;
};

typedef struct pi_protocol PIP;

extern int pi_register( PIP * );
extern void pi_unregister ( PIP * );

#endif /* __DRIVERS_PARIDE_H__ */
/* end of paride.h */