/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe and Charles M. Hannum.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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.
*/
/*
* 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 access handle for ELINK_ID_PORT!
*/
void
elink_reset(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 = kmem_alloc(sizeof(*er), KM_SLEEP);
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);
/*
* 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 access handle for ELINK_ID_PORT!
*/
void
elink_idseq(bus_space_tag_t iot, bus_space_handle_t ioh, u_char p)
{
int i;
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;
}
}
