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elink.c revision 1.12 
      1 /*	$NetBSD: elink.c,v 1.12 1998/08/15 03:51:31 mycroft Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe and Charles M. Hannum.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * Common code for dealing with 3COM ethernet cards.
     41  */
     42 
     43 #include <sys/param.h>
     44 #include <sys/systm.h>
     45 #include <sys/malloc.h>
     46 #include <sys/queue.h>
     47 
     48 #include <machine/bus.h>
     49 
     50 #include <dev/isa/elink.h>
     51 
     52 /*
     53  * This list keeps track of which ISAs have gotten an elink_reset().
     54  */
     55 struct elink_done_reset {
     56 	LIST_ENTRY(elink_done_reset)	er_link;
     57 	int				er_bus;
     58 };
     59 static LIST_HEAD(, elink_done_reset) elink_all_resets;
     60 static int elink_all_resets_initialized;
     61 
     62 /*
     63  * Issue a `global reset' to all cards, and reset the ID state machines.  We
     64  * have to be careful to do the global reset only once during autoconfig, to
     65  * prevent resetting boards that have already been configured.
     66  *
     67  * The "bus" argument here is the unit number of the ISA bus, e.g. "0"
     68  * if the bus is "isa0".
     69  *
     70  * NOTE: the caller MUST provide an access handle for ELINK_ID_PORT!
     71  */
     72 void
     73 elink_reset(iot, ioh, bus)
     74 	bus_space_tag_t iot;
     75 	bus_space_handle_t ioh;
     76 	int bus;
     77 {
     78 	struct elink_done_reset *er;
     79 
     80 	if (elink_all_resets_initialized == 0) {
     81 		LIST_INIT(&elink_all_resets);
     82 		elink_all_resets_initialized = 1;
     83 	}
     84 
     85 	/*
     86 	 * Reset these cards if we haven't done so already.
     87 	 */
     88 	for (er = elink_all_resets.lh_first; er != NULL;
     89 	    er = er->er_link.le_next)
     90 		if (er->er_bus == bus)
     91 			goto out;
     92 
     93 	/* Mark this bus so we don't do it again. */
     94 	er = (struct elink_done_reset *)malloc(sizeof(struct elink_done_reset),
     95 	    M_DEVBUF, M_NOWAIT);
     96 	if (er == NULL)
     97 		panic("elink_reset: can't allocate state storage");
     98 
     99 	er->er_bus = bus;
    100 	LIST_INSERT_HEAD(&elink_all_resets, er, er_link);
    101 
    102 	/* Haven't reset the cards on this bus, yet. */
    103 	bus_space_write_1(iot, ioh, 0, ELINK_RESET);
    104 
    105  out:
    106 	bus_space_write_1(iot, ioh, 0, 0x00);
    107 	bus_space_write_1(iot, ioh, 0, 0x00);
    108 }
    109 
    110 /*
    111  * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0
    112  * bits are shifted in.  Different board types use different polynomials.
    113  *
    114  * NOTE: the caller MUST provide an access handle for ELINK_ID_PORT!
    115  */
    116 void
    117 elink_idseq(iot, ioh, p)
    118 	bus_space_tag_t iot;
    119 	bus_space_handle_t ioh;
    120 	register u_char p;
    121 {
    122 	register int i;
    123 	register u_char c;
    124 
    125 	c = 0xff;
    126 	for (i = 255; i; i--) {
    127 		bus_space_write_1(iot, ioh, 0, c);
    128 		if (c & 0x80) {
    129 			c <<= 1;
    130 			c ^= p;
    131 		} else
    132 			c <<= 1;
    133 	}
    134 }
    135