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/* $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;
}
}
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