/*	$NetBSD: isavar.h,v 1.16 1995/06/07 06:45:44 cgd Exp $	*/

/*
 * Copyright (c) 1995 Chris G. Demetriou
 * Copyright (c) 1992 Berkeley Software Design, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Berkeley Software
 *	Design, Inc.
 * 4. The name of Berkeley Software Design must not be used to endorse
 *    or promote products derived from this software without specific
 *    prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN, INC. ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN, INC. BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	BSDI Id: isavar.h,v 1.5 1992/12/01 18:06:00 karels Exp 
 */

/*
 * Definitions for ISA autoconfiguration.
 */

#include <sys/queue.h>

/*
 * ISA driver attach arguments
 */
struct isa_attach_args {
	int	ia_iobase;		/* base i/o address */
	int	ia_iosize;		/* span of ports used */
	int	ia_irq;			/* interrupt request */
	int	ia_drq;			/* DMA request */
	int	ia_maddr;		/* physical i/o mem addr */
	u_int	ia_msize;		/* size of i/o memory */
	void	*ia_aux;		/* driver specific */
};

#define	IOBASEUNK	-1		/* i/o address is unknown */
#define	IRQUNK		-1		/* interrupt request line is unknown */
#define	DRQUNK		-1		/* DMA request line is unknown */
#define	MADDRUNK	-1		/* shared memory address is unknown */

/*
 * Per-device ISA variables
 */
struct isadev {
	struct  device *id_dev;		/* back pointer to generic */
	TAILQ_ENTRY(isadev)
		id_bchain;		/* bus chain */
};

/*
 * ISA master bus
 */
struct isa_softc {
	struct	device sc_dev;		/* base device */
	TAILQ_HEAD(, isadev)
		sc_subdevs;		/* list of all children */
};

#define		cf_iobase		cf_loc[0]
#define		cf_iosize		cf_loc[1]
#define		cf_maddr		cf_loc[2]
#define		cf_msize		cf_loc[3]
#define		cf_irq			cf_loc[4]
#define		cf_drq			cf_loc[5]

/*
 * ISA interrupt handler manipulation.
 * 
 * To establish an ISA interrupt handler, a driver calls isa_intr_establish()
 * with the interrupt number, type, level, function, and function argument of
 * the interrupt it wants to handle.  Isa_intr_establish() returns an opaque
 * handle to an event descriptor if it succeeds, and invokes panic() if it
 * fails.  (XXX It should return NULL, then drivers should handle that, but
 * what should they do?)  Interrupt handlers should return 0 for "interrupt
 * not for me", 1  for "I took care of it", or -1 for "I guess it was mine,
 * but I wasn't expecting it."
 *
 * To remove an interrupt handler, the driver calls isa_intr_disestablish() 
 * with the handle returned by isa_intr_establish() for that handler.
 */

/* ISA interrupt sharing types */
typedef enum {
	ISA_IST_NONE = 0,	/* not yet assigned */
	ISA_IST_PULSE,		/* pulsed */
	ISA_IST_EDGE,		/* edge-triggered */
	ISA_IST_LEVEL		/* level-triggered */
} isa_intrtype;

/* ISA interrupt levels; system interrupt levels for ISA bus use */
typedef enum {
	ISA_IPL_NONE,		/* block only the interrupt's IRQ*/
	ISA_IPL_BIO,		/* block I/O interrupts */
	ISA_IPL_NET,		/* network */
	ISA_IPL_TTY,		/* terminal */
	ISA_IPL_CLOCK,		/* clock */
} isa_intrlevel;

void	isascan __P((struct device *parent, void *match));
void	*isa_intr_establish __P((int intr, isa_intrtype type,
	    isa_intrlevel level, int (*ih_fun)(void *), void *ih_arg));
void	isa_intr_disestablish __P((void *handler));
char	*isa_intr_typename __P((isa_intrtype type));

#ifdef NEWCONFIG
/*
 * Establish a device as being on the ISA bus (XXX NOT IMPLEMENTED).
 */
void isa_establish __P((struct isadev *, struct device *));
#endif

/*
 * software conventions
 */
typedef enum { BUS_ISA, BUS_EISA } isa_type;

extern isa_type isa_bustype;	/* type of bus; XXX should be in softc */