1 /* $NetBSD: elink.c,v 1.13 2000/03/30 12:45:32 augustss Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe and Charles M. Hannum. 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 * Common code for dealing with 3COM ethernet cards. 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/malloc.h> 46 #include <sys/queue.h> 47 48 #include <machine/bus.h> 49 50 #include <dev/isa/elink.h> 51 52 /* 53 * This list keeps track of which ISAs have gotten an elink_reset(). 54 */ 55 struct elink_done_reset { 56 LIST_ENTRY(elink_done_reset) er_link; 57 int er_bus; 58 }; 59 static LIST_HEAD(, elink_done_reset) elink_all_resets; 60 static int elink_all_resets_initialized; 61 62 /* 63 * Issue a `global reset' to all cards, and reset the ID state machines. We 64 * have to be careful to do the global reset only once during autoconfig, to 65 * prevent resetting boards that have already been configured. 66 * 67 * The "bus" argument here is the unit number of the ISA bus, e.g. "0" 68 * if the bus is "isa0". 69 * 70 * NOTE: the caller MUST provide an access handle for ELINK_ID_PORT! 71 */ 72 void 73 elink_reset(iot, ioh, bus) 74 bus_space_tag_t iot; 75 bus_space_handle_t ioh; 76 int bus; 77 { 78 struct elink_done_reset *er; 79 80 if (elink_all_resets_initialized == 0) { 81 LIST_INIT(&elink_all_resets); 82 elink_all_resets_initialized = 1; 83 } 84 85 /* 86 * Reset these cards if we haven't done so already. 87 */ 88 for (er = elink_all_resets.lh_first; er != NULL; 89 er = er->er_link.le_next) 90 if (er->er_bus == bus) 91 goto out; 92 93 /* Mark this bus so we don't do it again. */ 94 er = (struct elink_done_reset *)malloc(sizeof(struct elink_done_reset), 95 M_DEVBUF, M_NOWAIT); 96 if (er == NULL) 97 panic("elink_reset: can't allocate state storage"); 98 99 er->er_bus = bus; 100 LIST_INSERT_HEAD(&elink_all_resets, er, er_link); 101 102 /* Haven't reset the cards on this bus, yet. */ 103 bus_space_write_1(iot, ioh, 0, ELINK_RESET); 104 105 out: 106 bus_space_write_1(iot, ioh, 0, 0x00); 107 bus_space_write_1(iot, ioh, 0, 0x00); 108 } 109 110 /* 111 * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0 112 * bits are shifted in. Different board types use different polynomials. 113 * 114 * NOTE: the caller MUST provide an access handle for ELINK_ID_PORT! 115 */ 116 void 117 elink_idseq(iot, ioh, p) 118 bus_space_tag_t iot; 119 bus_space_handle_t ioh; 120 u_char p; 121 { 122 int i; 123 u_char c; 124 125 c = 0xff; 126 for (i = 255; i; i--) { 127 bus_space_write_1(iot, ioh, 0, c); 128 if (c & 0x80) { 129 c <<= 1; 130 c ^= p; 131 } else 132 c <<= 1; 133 } 134 } 135