Home | History | Annotate | Line # | Download | only in isa
elink.c revision 1.15 
      1 /*	$NetBSD: elink.c,v 1.15 2007/10/19 12:00:16 ad 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/cdefs.h>
     44 __KERNEL_RCSID(0, "$NetBSD: elink.c,v 1.15 2007/10/19 12:00:16 ad Exp $");
     45 
     46 #include <sys/param.h>
     47 #include <sys/systm.h>
     48 #include <sys/malloc.h>
     49 #include <sys/queue.h>
     50 
     51 #include <sys/bus.h>
     52 
     53 #include <dev/isa/elink.h>
     54 
     55 /*
     56  * This list keeps track of which ISAs have gotten an elink_reset().
     57  */
     58 struct elink_done_reset {
     59 	LIST_ENTRY(elink_done_reset)	er_link;
     60 	int				er_bus;
     61 };
     62 static LIST_HEAD(, elink_done_reset) elink_all_resets;
     63 static int elink_all_resets_initialized;
     64 
     65 /*
     66  * Issue a `global reset' to all cards, and reset the ID state machines.  We
     67  * have to be careful to do the global reset only once during autoconfig, to
     68  * prevent resetting boards that have already been configured.
     69  *
     70  * The "bus" argument here is the unit number of the ISA bus, e.g. "0"
     71  * if the bus is "isa0".
     72  *
     73  * NOTE: the caller MUST provide an access handle for ELINK_ID_PORT!
     74  */
     75 void
     76 elink_reset(iot, ioh, bus)
     77 	bus_space_tag_t iot;
     78 	bus_space_handle_t ioh;
     79 	int bus;
     80 {
     81 	struct elink_done_reset *er;
     82 
     83 	if (elink_all_resets_initialized == 0) {
     84 		LIST_INIT(&elink_all_resets);
     85 		elink_all_resets_initialized = 1;
     86 	}
     87 
     88 	/*
     89 	 * Reset these cards if we haven't done so already.
     90 	 */
     91 	for (er = elink_all_resets.lh_first; er != NULL;
     92 	    er = er->er_link.le_next)
     93 		if (er->er_bus == bus)
     94 			goto out;
     95 
     96 	/* Mark this bus so we don't do it again. */
     97 	er = (struct elink_done_reset *)malloc(sizeof(struct elink_done_reset),
     98 	    M_DEVBUF, M_NOWAIT);
     99 	if (er == NULL)
    100 		panic("elink_reset: can't allocate state storage");
    101 
    102 	er->er_bus = bus;
    103 	LIST_INSERT_HEAD(&elink_all_resets, er, er_link);
    104 
    105 	/* Haven't reset the cards on this bus, yet. */
    106 	bus_space_write_1(iot, ioh, 0, ELINK_RESET);
    107 
    108  out:
    109 	bus_space_write_1(iot, ioh, 0, 0x00);
    110 	bus_space_write_1(iot, ioh, 0, 0x00);
    111 }
    112 
    113 /*
    114  * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0
    115  * bits are shifted in.  Different board types use different polynomials.
    116  *
    117  * NOTE: the caller MUST provide an access handle for ELINK_ID_PORT!
    118  */
    119 void
    120 elink_idseq(iot, ioh, p)
    121 	bus_space_tag_t iot;
    122 	bus_space_handle_t ioh;
    123 	u_char p;
    124 {
    125 	int i;
    126 	u_char c;
    127 
    128 	c = 0xff;
    129 	for (i = 255; i; i--) {
    130 		bus_space_write_1(iot, ioh, 0, c);
    131 		if (c & 0x80) {
    132 			c <<= 1;
    133 			c ^= p;
    134 		} else
    135 			c <<= 1;
    136 	}
    137 }
    138