dmareg.h

早期freebsd实现

/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * All advertising materials mentioning features or use of this software
 * must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Lawrence Berkeley Laboratory.
 *
 * 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 University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 *
 *	@(#)dmareg.h	8.1 (Berkeley) 6/11/93
 *
 * from: $Header: dmareg.h,v 1.6 93/04/27 14:39:17 torek Exp $ (LBL)
 */

/*
 * Sun-4c Sbus slot 0 DMA registers.
 *
 * Note that the dma_addr on the rev 1 gate array cannot increment
 * across a 16 MB boundary (the counter is only 24 bits wide; the
 * top 8 bits are simply latched).
 */
struct dmareg {
	u_long	dma_csr;	/* control/status register */
	u_long	dma_addr;	/* address (virtual: is fed to MMU) */
	u_long	dma_bc;		/* byte count (not used) */
	u_long	dma_diag;	/* diagnostic register (not used) */
};

/*
 * Bits in dma_csr.
 * DMA chip revision numbers are confusing (rev 3 = `DMA2'?!).
 * Not my fault; we just live with what they give us....
 *
 * Notes in [brackets]:
 *	1: used this way in rev 1 (`DMA') chips.
 *	2: used this way in rev 2 (`DMA+') chips.
 *	3: used this way in rev 3 (`DMA2') chips.
 *	R: not self-clearing, must be reset after being set.
 *	D: `drain' is like Unibus `bdp purge', i.e., it tells
 *	   the chip to finish up, because there is no more data
 *	   going into the buffer register.  Supposed to be needed
 *	   only in rev 1, but apparently needed or harmless in all
 *	   revs.  Self-clearing (hence write-only).
 *	I: also enables scsi interrupts.
 */
#define	DMA_REV(csr)	(((csr) >> 28) & 0xf)	/* device id field */
#define	DMAREV_1	0x8		/* rev 1 DMA gate array */
#define	DMAREV_2	0x9		/* rev 2 DMA gate array (`DMA+') */
#define	DMAREV_3	0xa		/* rev 3 DMA gate array (`DMA2') */

#define	DMA_1ZERO	0x0fff0000	/* unused; reads as zero [1] */
#define	DMA_NAL		0x08000000	/* next address loaded [2] (ro) */
#define	DMA_AL		0x04000000	/* address loaded [2] (ro) */
#define	DMA_ON		0x02000000	/* working [2] (ro) */
#define	DMA_NAE		0x01000000	/* next-address enable [2] (rw) */
#define	DMA_DTCI	0x00800000	/* disable DMA_TC intr [2] (rw) */
#define	DMA_TURBO	0x00400000	/* faster 53C90A mode [2] (rw) */
#define	DMA_LERR	0x00200000	/* LANCE error [2] (ro) */
#define	DMA_TWOCYCLE	0x00200000	/* two cycle mode [3] (rw?) */
#define	DMA_ALE		0x00100000	/* LANCE addr latch ena [2] (rw) */
#define	DMA_2ZERO	0x000f0000	/* unused; reads as zero [2] */
#define	DMA_BURSTMASK	0x000c0000	/* burst mode mask [3] */
#define	DMA_BURST16	0x00000000		/* 16-byte bursts (default) */
#define	DMA_BURST32	0x00040000		/* 32-byte bursts */
#define	DMA_BURST0	0x00080000		/* no bursts */
#define	DMA_ILACC	0x00008000	/* for new AMD ethernet chip [1,2] */
#define	DMA_TC		0x00004000	/* terminal cnt: dma_bc ran out [1,2] */
#define	DMA_BCE		0x00002000	/* byte count enable (leave 0) */
#define	DMA_BO		0x00001800	/* byte offset [1] (ro) */
#define	DMA_RP		0x00000400	/* busy, plz don't flush [1] (ro) */
#define	DMA_ENA		0x00000200	/* enable the dma chip */
#define	DMA_READ	0x00000100	/* set for dev=>mem, i.e., read() */
#define	DMA_RESET	0x00000080	/* reset dma chip [R] */
#define	DMA_DRAIN	0x00000040	/* drain buffered data [D,1] (wo) */
#define	DMA_SLAVEERR	0x00000040	/* slave error [2,3] (ro) */
#define	DMA_FLUSH	0x00000020	/* clear PC, EP, and TC [2,3] (wo) */
#define	DMA_IE		0x00000010	/* interrupt enable [2,3,I] */
#define	DMA_PC		0x0000000c	/* bytes in pack reg [1] (ro) */
#define	DMA_DRAINING	0x0000000c	/* nonzero => draining [2,3] (ro) */
#define	DMA_EP		0x00000002	/* error pending (ro) */
#define	DMA_IP		0x00000001	/* interrupt pending (ro) */

#define	DMA_REV1_BITS \
"\20\20ILACC\17TC\16BCE\13RP\12ENA\11READ\10RESET\7DRAIN\2EP\1IP"

/* Look ma, second system syndrome! */
#define	DMA_REV2_BITS \
"\20\34NAL\33AL\32ON\31NAE\30DTCI\27TURBO\26LERR\25ALE\
\20ILACC\17TC\16BCE\12ENA\11READ\10RESET\7SLAVEERR\6FLUSH\5IE\2EP\1IP"

/* (Note how most of the crap has been discarded now.) */
#define	DMA_REV3_BITS \
"\20\26TWOCYCLE\16BCE\12ENA\11READ\10RESET\7SLAVEERR\6FLUSH\5IE\2EP\1IP"

/* DMA_BYTE turns the DMA_BO field into a byte index */
#define	DMA_BYTE(csr)	(((csr) >> 11) & 3)

/* DMA_NPACK turns the DMA_PC field into a byte count */
#define	DMA_NPACK(csr)	(((csr) >> 2) & 3)

/* DMA_INTR is true if the DMA chip says an ESP or DMA interrupt is pending */
#define	DMA_INTR(csr)	((csr) & (DMA_IP | DMA_EP))