1/* $NetBSD: scsi_5380.h,v 1.6 2003/05/03 18:10:51 wiz Exp $ */
2
3/*
4 * Mach Operating System
5 * Copyright (c) 1991,1990,1989 Carnegie Mellon University
6 * All Rights Reserved.
7 *
8 * Permission to use, copy, modify and distribute this software and its
9 * documentation is hereby granted, provided that both the copyright
10 * notice and this permission notice appear in all copies of the
11 * software, derivative works or modified versions, and any portions
12 * thereof, and that both notices appear in supporting documentation.
13 *
14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
17 *
18 * Carnegie Mellon requests users of this software to return to
19 *
20 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
21 * School of Computer Science
22 * Carnegie Mellon University
23 * Pittsburgh PA 15213-3890
24 *
25 * any improvements or extensions that they make and grant Carnegie the
26 * rights to redistribute these changes.
27 */
28/*
29 * File: scsi_5380.h
30 * Author: Alessandro Forin, Carnegie Mellon University
31 * Date: 5/91
32 *
33 * Defines for the NCR 5380 (SCSI chip), aka Am5380
34 */
35
36/*
37 * Register map
38 */
39
40typedef struct {
41 volatile unsigned char sci_data; /* r: Current data */
42#define sci_odata sci_data /* w: Out data */
43 PAD(pad0);
44
45 volatile unsigned char sci_icmd; /* rw: Initiator command */
46 PAD(pad1);
47
48 volatile unsigned char sci_mode; /* rw: Mode */
49 PAD(pad2);
50
51 volatile unsigned char sci_tcmd; /* rw: Target command */
52 PAD(pad3);
53
54 volatile unsigned char sci_bus_csr; /* r: Bus Status */
55#define sci_sel_enb sci_bus_csr /* w: Select enable */
56 PAD(pad4);
57
58 volatile unsigned char sci_csr; /* r: Status */
59#define sci_dma_send sci_csr /* w: Start DMA send data */
60 PAD(pad5);
61
62 volatile unsigned char sci_idata; /* r: Input data */
63#define sci_trecv sci_idata /* w: Start DMA receive, target */
64 PAD(pad6);
65
66 volatile unsigned char sci_iack; /* r: Interrupt Acknowledge */
67#define sci_irecv sci_iack /* w: Start DMA receive, initiator */
68} sci_regmap_t;
69
70
71/*
72 * Initiator command register
73 */
74
75#define SCI_ICMD_DATA 0x01 /* rw: Assert data bus */
76#define SCI_ICMD_ATN 0x02 /* rw: Assert ATN signal */
77#define SCI_ICMD_SEL 0x04 /* rw: Assert SEL signal */
78#define SCI_ICMD_BSY 0x08 /* rw: Assert BSY signal */
79#define SCI_ICMD_ACK 0x10 /* rw: Assert ACK signal */
80#define SCI_ICMD_LST 0x20 /* r: Lost arbitration */
81#define SCI_ICMD_DIFF SCI_ICMD_LST /* w: Differential cable */
82#define SCI_ICMD_AIP 0x40 /* r: Arbitration in progress */
83#define SCI_ICMD_TEST SCI_ICMD_AIP /* w: Test mode */
84#define SCI_ICMD_RST 0x80 /* rw: Assert RST signal */
85
86
87/*
88 * Mode register
89 */
90
91#define SCI_MODE_ARB 0x01 /* rw: Start arbitration */
92#define SCI_MODE_DMA 0x02 /* rw: Enable DMA xfers */
93#define SCI_MODE_MONBSY 0x04 /* rw: Monitor BSY signal */
94#define SCI_MODE_DMA_IE 0x08 /* rw: Enable DMA complete interrupt */
95#define SCI_MODE_PERR_IE 0x10 /* rw: Interrupt on parity errors */
96#define SCI_MODE_PAR_CHK 0x20 /* rw: Check parity */
97#define SCI_MODE_TARGET 0x40 /* rw: Target mode (Initiator if 0) */
98#define SCI_MODE_BLOCKDMA 0x80 /* rw: Block-mode DMA handshake (MBZ) */
99
100
101/*
102 * Target command register
103 */
104
105#define SCI_TCMD_IO 0x01 /* rw: Assert I/O signal */
106#define SCI_TCMD_CD 0x02 /* rw: Assert C/D signal */
107#define SCI_TCMD_MSG 0x04 /* rw: Assert MSG signal */
108#define SCI_TCMD_PHASE_MASK 0x07 /* r: Mask for current bus phase */
109#define SCI_TCMD_REQ 0x08 /* rw: Assert REQ signal */
110#define SCI_TCMD_LAST_SENT 0x80 /* ro: Last byte was xferred
111 * (not on 5380/1) */
112
113#define SCI_PHASE(x) SCSI_PHASE(x)
114
115/*
116 * Current (SCSI) Bus status
117 */
118
119#define SCI_BUS_DBP 0x01 /* r: Data Bus parity */
120#define SCI_BUS_SEL 0x02 /* r: SEL signal */
121#define SCI_BUS_IO 0x04 /* r: I/O signal */
122#define SCI_BUS_CD 0x08 /* r: C/D signal */
123#define SCI_BUS_MSG 0x10 /* r: MSG signal */
124#define SCI_BUS_REQ 0x20 /* r: REQ signal */
125#define SCI_BUS_BSY 0x40 /* r: BSY signal */
126#define SCI_BUS_RST 0x80 /* r: RST signal */
127
128#define SCI_CUR_PHASE(x) SCSI_PHASE((x)>>2)
129
130/*
131 * Bus and Status register
132 */
133
134#define SCI_CSR_ACK 0x01 /* r: ACK signal */
135#define SCI_CSR_ATN 0x02 /* r: ATN signal */
136#define SCI_CSR_DISC 0x04 /* r: Disconnected (BSY==0) */
137#define SCI_CSR_PHASE_MATCH 0x08 /* r: Bus and SCI_TCMD match */
138#define SCI_CSR_INT 0x10 /* r: Interrupt request */
139#define SCI_CSR_PERR 0x20 /* r: Parity error */
140#define SCI_CSR_DREQ 0x40 /* r: DMA request */
141#define SCI_CSR_DONE 0x80 /* r: DMA count is zero */