/* $NetBSD: sunscpalreg.h,v 1.3 2008/04/28 20:23:51 martin Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matthew Fredette.
*
* 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.
*
* 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.
*/
/*
* Macros for accessing the registers in the Sun "Sun-2" "sc"
* PAL+logic sequencer chips.
*/
/*
* Interface Control Register.
*
* This register pretty much just reflects the state of the SCSI
* bus, directly. For example, the _COMMAND_DATA, _MESSAGE,
* and _INPUT_OUTPUT bits and their values correspond directly
* to SCSI bus signals.
*
* Note:
* (r) indicates bit is read only.
* (rw) indicates bit is read or write.
*/
#define SUNSCPAL_ICR_PARITY_ERROR 0x8000 /* (r) parity error */
#define SUNSCPAL_ICR_BUS_ERROR 0x4000 /* (r) bus error */
#define SUNSCPAL_ICR_ODD_LENGTH 0x2000 /* (r) odd length */
#define SUNSCPAL_ICR_INTERRUPT_REQUEST 0x1000 /* (r) interrupt request */
#define SUNSCPAL_ICR_REQUEST 0x0800 /* (r) request */
#define SUNSCPAL_ICR_MESSAGE 0x0400 /* (r) message */
#define SUNSCPAL_ICR_COMMAND_DATA 0x0200 /* (r) 1=command, 0=data */
#define SUNSCPAL_ICR_INPUT_OUTPUT 0x0100 /* (r) 1=input (initiator should read), 0=output */
#define SUNSCPAL_ICR_PARITY 0x0080 /* (r) parity */
#define SUNSCPAL_ICR_BUSY 0x0040 /* (r) busy */
#define SUNSCPAL_ICR_SELECT 0x0020 /* (rw) select */
#define SUNSCPAL_ICR_RESET 0x0010 /* (rw) reset */
#define SUNSCPAL_ICR_PARITY_ENABLE 0x0008 /* (rw) enable parity */
#define SUNSCPAL_ICR_WORD_MODE 0x0004 /* (rw) word mode */
#define SUNSCPAL_ICR_DMA_ENABLE 0x0002 /* (rw) enable DMA */
#define SUNSCPAL_ICR_INTERRUPT_ENABLE 0x0001 /* (rw) enable interrupts */
/*
* This chip keeps its DMA count with its bits flipped. Normally, you
* would just use the ~ operator everywhere. However, apparently that
* operator doesn't always work as you would expect, i.e.:
*
* #include <stdio.h>
* int main() {
* unsigned short x;
* int y;
* x = 0;
* y = ~x;
* printf("%d\n", y);
* }
*
* prints -1, not 65535. So this macro does the bit-flipping
* carefully for you.
*/
#define SUNSCPAL_DMA_COUNT_FLIP(x) (((unsigned short) (x)) ^ 0xFFFF)
