Annotation of sys/dev/isa/elink.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: elink.c,v 1.7 2007/06/29 15:17:02 jasper Exp $ */
2: /* $NetBSD: elink.c,v 1.9 1996/05/03 19:06:27 christos Exp $ */
3:
4: /*
5: * Copyright (c) 1996 Jason R. Thorpe. All rights reserved.
6: * Copyright (c) 1994, 1995 Charles Hannum. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by Charles Hannum.
19: * 4. The name of the author may not be used to endorse or promote products
20: * derived from this software without specific prior written permission.
21: *
22: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32: */
33:
34: /*
35: * Common code for dealing with 3COM ethernet cards.
36: */
37:
38: #include <sys/param.h>
39: #include <sys/systm.h>
40: #include <sys/malloc.h>
41: #include <sys/queue.h>
42:
43: #include <machine/bus.h>
44:
45: #include <dev/isa/elink.h>
46:
47: /*
48: * This list keeps track of which ISAs have gotten an elink_reset().
49: */
50: struct elink_done_reset {
51: LIST_ENTRY(elink_done_reset) er_link;
52: int er_bus;
53: };
54: static LIST_HEAD(, elink_done_reset) elink_all_resets;
55: static int elink_all_resets_initialized;
56:
57: /*
58: * Issue a `global reset' to all cards, and reset the ID state machines. We
59: * have to be careful to do the global reset only once during autoconfig, to
60: * prevent resetting boards that have already been configured.
61: *
62: * The "bus" argument here is the unit number of the ISA bus, e.g. "0"
63: * if the bus is "isa0".
64: *
65: * NOTE: the caller MUST provide an i/o handle for ELINK_ID_PORT!
66: */
67: void
68: elink_reset(bus_space_tag_t iot, bus_space_handle_t ioh, int bus)
69: {
70: struct elink_done_reset *er;
71:
72: if (elink_all_resets_initialized == 0) {
73: LIST_INIT(&elink_all_resets);
74: elink_all_resets_initialized = 1;
75: }
76:
77: /*
78: * Reset these cards if we haven't done so already.
79: */
80: LIST_FOREACH(er, &elink_all_resets, er_link)
81: if (er->er_bus == bus)
82: goto out;
83:
84: /* Mark this bus so we don't do it again. */
85: er = (struct elink_done_reset *)malloc(sizeof(struct elink_done_reset),
86: M_DEVBUF, M_NOWAIT);
87: if (er == NULL)
88: panic("elink_reset: can't allocate state storage");
89:
90: er->er_bus = bus;
91: LIST_INSERT_HEAD(&elink_all_resets, er, er_link);
92:
93: /* Haven't reset the cards on this bus, yet. */
94: bus_space_write_1(iot, ioh, 0, ELINK_RESET);
95:
96: out:
97: bus_space_write_1(iot, ioh, 0, 0x00);
98: bus_space_write_1(iot, ioh, 0, 0x00);
99: }
100:
101: /*
102: * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0
103: * bits are shifted in. Different board types use different polynomials.
104: *
105: * NOTE: the caller MUST provide an i/o handle for ELINK_ID_PORT!
106: */
107: void
108: elink_idseq(bus_space_tag_t iot, bus_space_handle_t ioh, u_char p)
109: {
110: int i;
111: u_char c;
112:
113: c = 0xff;
114: for (i = 255; i; i--) {
115: bus_space_write_1(iot, ioh, 0, c);
116: if (c & 0x80) {
117: c <<= 1;
118: c ^= p;
119: } else
120: c <<= 1;
121: }
122: }
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