/* $OpenBSD: elink.c,v 1.5 1997/11/07 08:06:45 niklas Exp $ */ /* $NetBSD: elink.c,v 1.9 1996/05/03 19:06:27 christos Exp $ */ /* * Copyright (c) 1996 Jason R. Thorpe. All rights reserved. * Copyright (c) 1994, 1995 Charles Hannum. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Charles Hannum. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * Common code for dealing with 3COM ethernet cards. */ #include <sys/param.h> #include <sys/systm.h> #include <sys/malloc.h> #include <sys/queue.h> #include <machine/bus.h> #include <dev/isa/elink.h> /* * This list keeps track of which ISAs have gotten an elink_reset(). */ struct elink_done_reset { LIST_ENTRY(elink_done_reset) er_link; int er_bus; }; static LIST_HEAD(, elink_done_reset) elink_all_resets; static int elink_all_resets_initialized; /* * Issue a `global reset' to all cards, and reset the ID state machines. We * have to be careful to do the global reset only once during autoconfig, to * prevent resetting boards that have already been configured. * * The "bus" argument here is the unit number of the ISA bus, e.g. "0" * if the bus is "isa0". * * NOTE: the caller MUST provide an i/o handle for ELINK_ID_PORT! */ void elink_reset(iot, ioh, bus) bus_space_tag_t iot; bus_space_handle_t ioh; int bus; { struct elink_done_reset *er; if (elink_all_resets_initialized == 0) { LIST_INIT(&elink_all_resets); elink_all_resets_initialized = 1; } /* * Reset these cards if we haven't done so already. */ for (er = elink_all_resets.lh_first; er != NULL; er = er->er_link.le_next) if (er->er_bus == bus) goto out; /* Mark this bus so we don't do it again. */ er = (struct elink_done_reset *)malloc(sizeof(struct elink_done_reset), M_DEVBUF, M_NOWAIT); if (er == NULL) panic("elink_reset: can't allocate state storage"); er->er_bus = bus; LIST_INSERT_HEAD(&elink_all_resets, er, er_link); /* Haven't reset the cards on this bus, yet. */ bus_space_write_1(iot, ioh, 0, ELINK_RESET); out: bus_space_write_1(iot, ioh, 0, 0x00); bus_space_write_1(iot, ioh, 0, 0x00); } /* * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0 * bits are shifted in. Different board types use different polynomials. * * NOTE: the caller MUST provide an i/o handle for ELINK_ID_PORT! */ void elink_idseq(iot, ioh, p) bus_space_tag_t iot; bus_space_handle_t ioh; register u_char p; { register int i; register u_char c; c = 0xff; for (i = 255; i; i--) { bus_space_write_1(iot, ioh, 0, c); if (c & 0x80) { c <<= 1; c ^= p; } else c <<= 1; } }