93 lines
4.0 KiB
C
93 lines
4.0 KiB
C
/* $NetBSD: sunscpalreg.h,v 1.2 2001/07/15 16:32:40 fredette Exp $ */
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/*-
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matthew Fredette.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Macros for accessing the registers in the Sun "Sun-2" "sc"
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* PAL+logic sequencer chips.
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*/
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/*
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* Interface Control Register.
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*
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* This register pretty much just reflects the state of the SCSI
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* bus, directly. For example, the _COMMAND_DATA, _MESSAGE,
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* and _INPUT_OUTPUT bits and their values correspond directly
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* to SCSI bus signals.
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*
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* Note:
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* (r) indicates bit is read only.
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* (rw) indicates bit is read or write.
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*/
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#define SUNSCPAL_ICR_PARITY_ERROR 0x8000 /* (r) parity error */
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#define SUNSCPAL_ICR_BUS_ERROR 0x4000 /* (r) bus error */
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#define SUNSCPAL_ICR_ODD_LENGTH 0x2000 /* (r) odd length */
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#define SUNSCPAL_ICR_INTERRUPT_REQUEST 0x1000 /* (r) interrupt request */
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#define SUNSCPAL_ICR_REQUEST 0x0800 /* (r) request */
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#define SUNSCPAL_ICR_MESSAGE 0x0400 /* (r) message */
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#define SUNSCPAL_ICR_COMMAND_DATA 0x0200 /* (r) 1=command, 0=data */
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#define SUNSCPAL_ICR_INPUT_OUTPUT 0x0100 /* (r) 1=input (initiator should read), 0=output */
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#define SUNSCPAL_ICR_PARITY 0x0080 /* (r) parity */
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#define SUNSCPAL_ICR_BUSY 0x0040 /* (r) busy */
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#define SUNSCPAL_ICR_SELECT 0x0020 /* (rw) select */
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#define SUNSCPAL_ICR_RESET 0x0010 /* (rw) reset */
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#define SUNSCPAL_ICR_PARITY_ENABLE 0x0008 /* (rw) enable parity */
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#define SUNSCPAL_ICR_WORD_MODE 0x0004 /* (rw) word mode */
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#define SUNSCPAL_ICR_DMA_ENABLE 0x0002 /* (rw) enable DMA */
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#define SUNSCPAL_ICR_INTERRUPT_ENABLE 0x0001 /* (rw) enable interrupts */
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#define SUNSCPAL_ICR_BITS "\20\1INTEN\2DMAEN\3WM\4PAREN\5RESET\6SEL\7BSY\10PAR\11INPUT\12CMD\13MSG\14REQ\15INTRQ\16ODD\17BUSERR\20PARERR"
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/*
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* This chip keeps its DMA count with its bits flipped. Normally, you
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* would just use the ~ operator everywhere. However, apparently that
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* operator doesn't always work as you would expect, i.e.:
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*
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* #include <stdio.h>
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* int main() {
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* unsigned short x;
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* int y;
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* x = 0;
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* y = ~x;
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* printf("%d\n", y);
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* }
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*
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* prints -1, not 65535. So this macro does the bit-flipping
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* carefully for you.
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*/
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#define SUNSCPAL_DMA_COUNT_FLIP(x) (((unsigned short) (x)) ^ 0xFFFF)
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