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Annotation of sys/dev/isa/elink.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: elink.c,v 1.7 2007/06/29 15:17:02 jasper Exp $        */
        !             2: /*     $NetBSD: elink.c,v 1.9 1996/05/03 19:06:27 christos Exp $       */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1996 Jason R. Thorpe.  All rights reserved.
        !             6:  * Copyright (c) 1994, 1995 Charles Hannum.  All rights reserved.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. All advertising materials mentioning features or use of this software
        !            17:  *    must display the following acknowledgement:
        !            18:  *     This product includes software developed by Charles Hannum.
        !            19:  * 4. The name of the author may not be used to endorse or promote products
        !            20:  *    derived from this software without specific prior written permission.
        !            21:  *
        !            22:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            23:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
        !            24:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            25:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
        !            26:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
        !            27:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
        !            28:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
        !            29:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            30:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
        !            31:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            32:  */
        !            33:
        !            34: /*
        !            35:  * Common code for dealing with 3COM ethernet cards.
        !            36:  */
        !            37:
        !            38: #include <sys/param.h>
        !            39: #include <sys/systm.h>
        !            40: #include <sys/malloc.h>
        !            41: #include <sys/queue.h>
        !            42:
        !            43: #include <machine/bus.h>
        !            44:
        !            45: #include <dev/isa/elink.h>
        !            46:
        !            47: /*
        !            48:  * This list keeps track of which ISAs have gotten an elink_reset().
        !            49:  */
        !            50: struct elink_done_reset {
        !            51:        LIST_ENTRY(elink_done_reset)    er_link;
        !            52:        int                             er_bus;
        !            53: };
        !            54: static LIST_HEAD(, elink_done_reset) elink_all_resets;
        !            55: static int elink_all_resets_initialized;
        !            56:
        !            57: /*
        !            58:  * Issue a `global reset' to all cards, and reset the ID state machines.  We
        !            59:  * have to be careful to do the global reset only once during autoconfig, to
        !            60:  * prevent resetting boards that have already been configured.
        !            61:  *
        !            62:  * The "bus" argument here is the unit number of the ISA bus, e.g. "0"
        !            63:  * if the bus is "isa0".
        !            64:  *
        !            65:  * NOTE: the caller MUST provide an i/o handle for ELINK_ID_PORT!
        !            66:  */
        !            67: void
        !            68: elink_reset(bus_space_tag_t iot, bus_space_handle_t ioh, int bus)
        !            69: {
        !            70:        struct elink_done_reset *er;
        !            71:
        !            72:        if (elink_all_resets_initialized == 0) {
        !            73:                LIST_INIT(&elink_all_resets);
        !            74:                elink_all_resets_initialized = 1;
        !            75:        }
        !            76:
        !            77:        /*
        !            78:         * Reset these cards if we haven't done so already.
        !            79:         */
        !            80:        LIST_FOREACH(er, &elink_all_resets, er_link)
        !            81:                if (er->er_bus == bus)
        !            82:                        goto out;
        !            83:
        !            84:        /* Mark this bus so we don't do it again. */
        !            85:        er = (struct elink_done_reset *)malloc(sizeof(struct elink_done_reset),
        !            86:            M_DEVBUF, M_NOWAIT);
        !            87:        if (er == NULL)
        !            88:                panic("elink_reset: can't allocate state storage");
        !            89:
        !            90:        er->er_bus = bus;
        !            91:        LIST_INSERT_HEAD(&elink_all_resets, er, er_link);
        !            92:
        !            93:        /* Haven't reset the cards on this bus, yet. */
        !            94:        bus_space_write_1(iot, ioh, 0, ELINK_RESET);
        !            95:
        !            96:  out:
        !            97:        bus_space_write_1(iot, ioh, 0, 0x00);
        !            98:        bus_space_write_1(iot, ioh, 0, 0x00);
        !            99: }
        !           100:
        !           101: /*
        !           102:  * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0
        !           103:  * bits are shifted in.  Different board types use different polynomials.
        !           104:  *
        !           105:  * NOTE: the caller MUST provide an i/o handle for ELINK_ID_PORT!
        !           106:  */
        !           107: void
        !           108: elink_idseq(bus_space_tag_t iot, bus_space_handle_t ioh, u_char p)
        !           109: {
        !           110:        int i;
        !           111:        u_char c;
        !           112:
        !           113:        c = 0xff;
        !           114:        for (i = 255; i; i--) {
        !           115:                bus_space_write_1(iot, ioh, 0, c);
        !           116:                if (c & 0x80) {
        !           117:                        c <<= 1;
        !           118:                        c ^= p;
        !           119:                } else
        !           120:                        c <<= 1;
        !           121:        }
        !           122: }