1 /* $NetBSD: sunscpalreg.h,v 1.2 2001/07/15 16:32:40 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 #define SUNSCPAL_ICR_BITS "\20\1INTEN\2DMAEN\3WM\4PAREN\5RESET\6SEL\7BSY\10PAR\11INPUT\12CMD\13MSG\14REQ\15INTRQ\16ODD\17BUSERR\20PARERR" 74 75 /* 76 * This chip keeps its DMA count with its bits flipped. Normally, you 77 * would just use the ~ operator everywhere. However, apparently that 78 * operator doesn't always work as you would expect, i.e.: 79 * 80 * #include <stdio.h> 81 * int main() { 82 * unsigned short x; 83 * int y; 84 * x = 0; 85 * y = ~x; 86 * printf("%d\n", y); 87 * } 88 * 89 * prints -1, not 65535. So this macro does the bit-flipping 90 * carefully for you. 91 */ 92 #define SUNSCPAL_DMA_COUNT_FLIP(x) (((unsigned short) (x)) ^ 0xFFFF) 93