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sunscpalreg.h revision 1.1 
      1 /*	$NetBSD: sunscpalreg.h,v 1.1 2001/04/20 16:35:22 fredette Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Matthew Fredette.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * Macros for accessing the registers in the Sun "Sun-2" "sc"
     41  * PAL+logic sequencer chips.
     42  */
     43 
     44 /*
     45  * Interface Control Register.
     46  *
     47  * This register pretty much just reflects the state of the SCSI
     48  * bus, directly.  For example, the _COMMAND_DATA, _MESSAGE,
     49  * and _INPUT_OUTPUT bits and their values correspond directly
     50  * to SCSI bus signals.
     51  *
     52  * Note:
     53  *	(r)	indicates bit is read only.
     54  *	(rw)	indicates bit is read or write.
     55  */
     56 #define	SUNSCPAL_ICR_PARITY_ERROR	0x8000	/* (r) parity error */
     57 #define	SUNSCPAL_ICR_BUS_ERROR		0x4000	/* (r) bus error */
     58 #define	SUNSCPAL_ICR_ODD_LENGTH		0x2000	/* (r) odd length */
     59 #define	SUNSCPAL_ICR_INTERRUPT_REQUEST	0x1000	/* (r) interrupt request */
     60 #define	SUNSCPAL_ICR_REQUEST		0x0800	/* (r) request */
     61 #define	SUNSCPAL_ICR_MESSAGE		0x0400	/* (r) message */
     62 #define	SUNSCPAL_ICR_COMMAND_DATA	0x0200	/* (r) 1=command, 0=data */
     63 #define	SUNSCPAL_ICR_INPUT_OUTPUT	0x0100	/* (r) 1=input (initiator should read), 0=output */
     64 #define	SUNSCPAL_ICR_PARITY		0x0080	/* (r) parity */
     65 #define	SUNSCPAL_ICR_BUSY		0x0040	/* (r) busy */
     66 #define	SUNSCPAL_ICR_SELECT		0x0020	/* (rw) select */
     67 #define	SUNSCPAL_ICR_RESET		0x0010	/* (rw) reset */
     68 #define	SUNSCPAL_ICR_PARITY_ENABLE	0x0008	/* (rw) enable parity */
     69 #define	SUNSCPAL_ICR_WORD_MODE		0x0004	/* (rw) word mode */
     70 #define	SUNSCPAL_ICR_DMA_ENABLE		0x0002	/* (rw) enable DMA */
     71 #define	SUNSCPAL_ICR_INTERRUPT_ENABLE	0x0001	/* (rw) enable interrupts */
     72 
     73 /*
     74  * This chip keeps its DMA count with its bits flipped.  Normally, you
     75  * would just use the ~ operator everywhere.  However, apparently that
     76  * operator doesn't always work as you would expect, i.e.:
     77  *
     78  * #include <stdio.h>
     79  * int main() {
     80  *   unsigned short x;
     81  *   int y;
     82  *   x = 0;
     83  *   y = ~x;
     84  *   printf("%d\n", y);
     85  * }
     86  *
     87  * prints -1, not 65535.  So this macro does the bit-flipping
     88  * carefully for you.
     89  */
     90 #define SUNSCPAL_DMA_COUNT_FLIP(x) (((unsigned short) (x)) ^ 0xFFFF)
     91