122 lines
3.7 KiB
C
122 lines
3.7 KiB
C
/* $NetBSD: elink.c,v 1.18 2019/11/10 21:16:35 chs Exp $ */
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/*-
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe and Charles M. Hannum.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Common code for dealing with 3COM ethernet cards.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: elink.c,v 1.18 2019/11/10 21:16:35 chs Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/queue.h>
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#include <sys/bus.h>
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#include <dev/isa/elink.h>
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/*
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* This list keeps track of which ISAs have gotten an elink_reset().
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*/
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struct elink_done_reset {
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LIST_ENTRY(elink_done_reset) er_link;
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int er_bus;
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};
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static LIST_HEAD(, elink_done_reset) elink_all_resets;
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static int elink_all_resets_initialized;
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/*
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* Issue a `global reset' to all cards, and reset the ID state machines. We
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* have to be careful to do the global reset only once during autoconfig, to
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* prevent resetting boards that have already been configured.
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*
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* The "bus" argument here is the unit number of the ISA bus, e.g. "0"
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* if the bus is "isa0".
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*
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* NOTE: the caller MUST provide an access handle for ELINK_ID_PORT!
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*/
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void
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elink_reset(bus_space_tag_t iot, bus_space_handle_t ioh, int bus)
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{
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struct elink_done_reset *er;
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if (elink_all_resets_initialized == 0) {
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LIST_INIT(&elink_all_resets);
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elink_all_resets_initialized = 1;
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}
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/*
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* Reset these cards if we haven't done so already.
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*/
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for (er = elink_all_resets.lh_first; er != NULL;
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er = er->er_link.le_next)
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if (er->er_bus == bus)
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goto out;
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/* Mark this bus so we don't do it again. */
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er = (struct elink_done_reset *)malloc(sizeof(struct elink_done_reset),
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M_DEVBUF, M_WAITOK);
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er->er_bus = bus;
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LIST_INSERT_HEAD(&elink_all_resets, er, er_link);
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/* Haven't reset the cards on this bus, yet. */
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bus_space_write_1(iot, ioh, 0, ELINK_RESET);
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out:
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bus_space_write_1(iot, ioh, 0, 0x00);
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bus_space_write_1(iot, ioh, 0, 0x00);
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}
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/*
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* The `ID sequence' is really just snapshots of an 8-bit CRC register as 0
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* bits are shifted in. Different board types use different polynomials.
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*
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* NOTE: the caller MUST provide an access handle for ELINK_ID_PORT!
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*/
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void
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elink_idseq(bus_space_tag_t iot, bus_space_handle_t ioh, u_char p)
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{
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int i;
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u_char c;
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c = 0xff;
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for (i = 255; i; i--) {
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bus_space_write_1(iot, ioh, 0, c);
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if (c & 0x80) {
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c <<= 1;
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c ^= p;
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} else
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c <<= 1;
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}
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}
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