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Annotation of sys/dev/isa/elink.c, Revision 1.1.1.1

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: }