1 /* $NetBSD: elink.c,v 1.10 1996/10/21 22:40:39 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Jason R. Thorpe. All rights reserved. 5 * Copyright (c) 1994, 1995 Charles Hannum. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Charles Hannum. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Common code for dealing with 3COM ethernet cards. 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/malloc.h> 40 #include <sys/queue.h> 41 42 #include <machine/bus.h> 43 44 #include <dev/isa/elink.h> 45 46 /* 47 * This list keeps track of which ISAs have gotten an elink_reset(). 48 */ 49 struct elink_done_reset { 50 LIST_ENTRY(elink_done_reset) er_link; 51 int er_bus; 52 }; 53 static LIST_HEAD(, elink_done_reset) elink_all_resets; 54 static int elink_all_resets_initialized; 55 56 /* 57 * Issue a `global reset' to all cards, and reset the ID state machines. We 58 * have to be careful to do the global reset only once during autoconfig, to 59 * prevent resetting boards that have already been configured. 60 * 61 * The "bus" argument here is the unit number of the ISA bus, e.g. "0" 62 * if the bus is "isa0". 63 * 64 * NOTE: the caller MUST provide an access handle for ELINK_ID_PORT! 65 */ 66 void 67 elink_reset(iot, ioh, bus) 68 bus_space_tag_t iot; 69 bus_space_handle_t ioh; 70 int bus; 71 { 72 struct elink_done_reset *er; 73 74 if (elink_all_resets_initialized == 0) { 75 LIST_INIT(&elink_all_resets); 76 elink_all_resets_initialized = 1; 77 } 78 79 /* 80 * Reset these cards if we haven't done so already. 81 */ 82 for (er = elink_all_resets.lh_first; er != NULL; 83 er = er->er_link.le_next) 84 if (er->er_bus == bus) 85 goto out; 86 87 /* Mark this bus so we don't do it again. */ 88 er = (struct elink_done_reset *)malloc(sizeof(struct elink_done_reset), 89 M_DEVBUF, M_NOWAIT); 90 if (er == NULL) 91 panic("elink_reset: can't allocate state storage"); 92 93 er->er_bus = bus; 94 LIST_INSERT_HEAD(&elink_all_resets, er, er_link); 95 96 /* Haven't reset the cards on this bus, yet. */ 97 bus_space_write_1(iot, ioh, 0, ELINK_RESET); 98 99 out: 100 bus_space_write_1(iot, ioh, 0, 0x00); 101 bus_space_write_1(iot, ioh, 0, 0x00); 102 } 103 104 /* 105 * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0 106 * bits are shifted in. Different board types use different polynomials. 107 * 108 * NOTE: the caller MUST provide an access handle for ELINK_ID_PORT! 109 */ 110 void 111 elink_idseq(iot, ioh, p) 112 bus_space_tag_t iot; 113 bus_space_handle_t ioh; 114 register u_char p; 115 { 116 register int i; 117 register u_char c; 118 119 c = 0xff; 120 for (i = 255; i; i--) { 121 bus_space_write_1(iot, ioh, 0, c); 122 if (c & 0x80) { 123 c <<= 1; 124 c ^= p; 125 } else 126 c <<= 1; 127 } 128 } 129