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