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      1 /*	$NetBSD: sunscpalreg.h,v 1.3 2008/04/28 20:23:51 martin 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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Macros for accessing the registers in the Sun "Sun-2" "sc"
     34  * PAL+logic sequencer chips.
     35  */
     36 
     37 /*
     38  * Interface Control Register.
     39  *
     40  * This register pretty much just reflects the state of the SCSI
     41  * bus, directly.  For example, the _COMMAND_DATA, _MESSAGE,
     42  * and _INPUT_OUTPUT bits and their values correspond directly
     43  * to SCSI bus signals.
     44  *
     45  * Note:
     46  *	(r)	indicates bit is read only.
     47  *	(rw)	indicates bit is read or write.
     48  */
     49 #define	SUNSCPAL_ICR_PARITY_ERROR	0x8000	/* (r) parity error */
     50 #define	SUNSCPAL_ICR_BUS_ERROR		0x4000	/* (r) bus error */
     51 #define	SUNSCPAL_ICR_ODD_LENGTH		0x2000	/* (r) odd length */
     52 #define	SUNSCPAL_ICR_INTERRUPT_REQUEST	0x1000	/* (r) interrupt request */
     53 #define	SUNSCPAL_ICR_REQUEST		0x0800	/* (r) request */
     54 #define	SUNSCPAL_ICR_MESSAGE		0x0400	/* (r) message */
     55 #define	SUNSCPAL_ICR_COMMAND_DATA	0x0200	/* (r) 1=command, 0=data */
     56 #define	SUNSCPAL_ICR_INPUT_OUTPUT	0x0100	/* (r) 1=input (initiator should read), 0=output */
     57 #define	SUNSCPAL_ICR_PARITY		0x0080	/* (r) parity */
     58 #define	SUNSCPAL_ICR_BUSY		0x0040	/* (r) busy */
     59 #define	SUNSCPAL_ICR_SELECT		0x0020	/* (rw) select */
     60 #define	SUNSCPAL_ICR_RESET		0x0010	/* (rw) reset */
     61 #define	SUNSCPAL_ICR_PARITY_ENABLE	0x0008	/* (rw) enable parity */
     62 #define	SUNSCPAL_ICR_WORD_MODE		0x0004	/* (rw) word mode */
     63 #define	SUNSCPAL_ICR_DMA_ENABLE		0x0002	/* (rw) enable DMA */
     64 #define	SUNSCPAL_ICR_INTERRUPT_ENABLE	0x0001	/* (rw) enable interrupts */
     65 
     66 #define	SUNSCPAL_ICR_BITS	"\20\1INTEN\2DMAEN\3WM\4PAREN\5RESET\6SEL\7BSY\10PAR\11INPUT\12CMD\13MSG\14REQ\15INTRQ\16ODD\17BUSERR\20PARERR"
     67 
     68 /*
     69  * This chip keeps its DMA count with its bits flipped.  Normally, you
     70  * would just use the ~ operator everywhere.  However, apparently that
     71  * operator doesn't always work as you would expect, i.e.:
     72  *
     73  * #include <stdio.h>
     74  * int main() {
     75  *   unsigned short x;
     76  *   int y;
     77  *   x = 0;
     78  *   y = ~x;
     79  *   printf("%d\n", y);
     80  * }
     81  *
     82  * prints -1, not 65535.  So this macro does the bit-flipping
     83  * carefully for you.
     84  */
     85 #define SUNSCPAL_DMA_COUNT_FLIP(x) (((unsigned short) (x)) ^ 0xFFFF)
     86