/*	$NetBSD: smc83c170var.h,v 1.1 1998/06/02 01:29:42 thorpej Exp $	*/

/*-
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center.
 *
 * 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 the NetBSD
 *	Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 THE FOUNDATION OR CONTRIBUTORS
 * 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.
 */

#ifndef _DEV_IC_SMC83C170VAR_H_
#define _DEV_IC_SMC83C170VAR_H_

/*
 * Misc. definitions for the Standard Microsystems Corp. 83C170
 * Ethernet PCI Integrated Controller (EPIC/100) driver.
 */

/*
 * Transmit descriptor list size.
 */
#define	EPIC_NTXDESC		128
#define	EPIC_NTXDESC_MASK	(EPIC_NTXDESC - 1)
#define	EPIC_NEXTTX(x)		((x + 1) & EPIC_NTXDESC_MASK)

/*
 * Receive descriptor list size.
 */
#define	EPIC_NRXDESC		64
#define	EPIC_NRXDESC_MASK	(EPIC_NRXDESC - 1)
#define	EPIC_NEXTRX(x)		((x + 1) & EPIC_NRXDESC_MASK)

/*
 * Control structures are DMA'd to the EPIC chip.  We allocate them in
 * a single clump that maps to a single DMA segment to make several things
 * easier.
 */
struct epic_control_data {
	/*
	 * The transmit descriptors.
	 */
	struct epic_txdesc ecd_txdescs[EPIC_NTXDESC];

	/*
	 * The receive descriptors.
	 */
	struct epic_rxdesc ecd_rxdescs[EPIC_NRXDESC];

	/*
	 * The transmit fraglists.
	 */
	struct epic_fraglist ecd_txfrags[EPIC_NTXDESC];
};

#define	EPIC_CDOFF(x)	offsetof(struct epic_control_data, x)

/*
 * Software state for transmit and receive desciptors.
 */
struct epic_descsoft {
	struct mbuf *ds_mbuf;		/* head of mbuf chain */
	bus_dmamap_t ds_dmamap;		/* our DMA map */
};

/*
 * Software state per device.
 */
struct epic_softc {
	struct device sc_dev;		/* generic device information */
	bus_space_tag_t sc_st;		/* bus space tag */
	bus_space_handle_t sc_sh;	/* bus space handle */
	bus_dma_tag_t sc_dmat;		/* bus DMA tag */
	struct ethercom sc_ethercom;	/* ethernet common data */
	void *sc_sdhook;		/* shutdown hook */

	struct ifmedia sc_media;	/* media information */

	bus_dmamap_t sc_cddmamap;	/* control data DMA map */
#define	sc_cddma	sc_cddmamap->dm_segs[0].ds_addr

	/*
	 * Software state for transmit and receive descriptors.
	 */
	struct epic_descsoft sc_txsoft[EPIC_NTXDESC];
	struct epic_descsoft sc_rxsoft[EPIC_NRXDESC];

	/*
	 * Control data structures.
	 */
	struct epic_control_data *sc_control_data;

	int	sc_txpending;		/* number of TX requests pending */
	int	sc_txdirty;		/* first dirty TX descriptor */
	int	sc_txlast;		/* last used TX descriptor */

	int	sc_rxptr;		/* next ready RX descriptor */
};

#ifdef _KERNEL
void	epic_attach __P((struct epic_softc *));
int	epic_intr __P((void *));
#endif /* _KERNEL */

#endif /* _DEV_IC_SMC83C170VAR_H_ */