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 "\2\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)
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