1 /* $NetBSD: elink.c,v 1.14 2001/11/13 08:01:12 lukem 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/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: elink.c,v 1.14 2001/11/13 08:01:12 lukem Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/malloc.h> 49 #include <sys/queue.h> 50 51 #include <machine/bus.h> 52 53 #include <dev/isa/elink.h> 54 55 /* 56 * This list keeps track of which ISAs have gotten an elink_reset(). 57 */ 58 struct elink_done_reset { 59 LIST_ENTRY(elink_done_reset) er_link; 60 int er_bus; 61 }; 62 static LIST_HEAD(, elink_done_reset) elink_all_resets; 63 static int elink_all_resets_initialized; 64 65 /* 66 * Issue a `global reset' to all cards, and reset the ID state machines. We 67 * have to be careful to do the global reset only once during autoconfig, to 68 * prevent resetting boards that have already been configured. 69 * 70 * The "bus" argument here is the unit number of the ISA bus, e.g. "0" 71 * if the bus is "isa0". 72 * 73 * NOTE: the caller MUST provide an access handle for ELINK_ID_PORT! 74 */ 75 void 76 elink_reset(iot, ioh, bus) 77 bus_space_tag_t iot; 78 bus_space_handle_t ioh; 79 int bus; 80 { 81 struct elink_done_reset *er; 82 83 if (elink_all_resets_initialized == 0) { 84 LIST_INIT(&elink_all_resets); 85 elink_all_resets_initialized = 1; 86 } 87 88 /* 89 * Reset these cards if we haven't done so already. 90 */ 91 for (er = elink_all_resets.lh_first; er != NULL; 92 er = er->er_link.le_next) 93 if (er->er_bus == bus) 94 goto out; 95 96 /* Mark this bus so we don't do it again. */ 97 er = (struct elink_done_reset *)malloc(sizeof(struct elink_done_reset), 98 M_DEVBUF, M_NOWAIT); 99 if (er == NULL) 100 panic("elink_reset: can't allocate state storage"); 101 102 er->er_bus = bus; 103 LIST_INSERT_HEAD(&elink_all_resets, er, er_link); 104 105 /* Haven't reset the cards on this bus, yet. */ 106 bus_space_write_1(iot, ioh, 0, ELINK_RESET); 107 108 out: 109 bus_space_write_1(iot, ioh, 0, 0x00); 110 bus_space_write_1(iot, ioh, 0, 0x00); 111 } 112 113 /* 114 * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0 115 * bits are shifted in. Different board types use different polynomials. 116 * 117 * NOTE: the caller MUST provide an access handle for ELINK_ID_PORT! 118 */ 119 void 120 elink_idseq(iot, ioh, p) 121 bus_space_tag_t iot; 122 bus_space_handle_t ioh; 123 u_char p; 124 { 125 int i; 126 u_char c; 127 128 c = 0xff; 129 for (i = 255; i; i--) { 130 bus_space_write_1(iot, ioh, 0, c); 131 if (c & 0x80) { 132 c <<= 1; 133 c ^= p; 134 } else 135 c <<= 1; 136 } 137 } 138