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if_ae.c revision 1.70 
      1 /*	$NetBSD: if_ae.c,v 1.70 2000/09/13 05:21:16 scottr Exp $	*/
      2 
      3 /*
      4  * Device driver for National Semiconductor DS8390/WD83C690 based ethernet
      5  * adapters.
      6  *
      7  * Copyright (c) 1994, 1995 Charles M. Hannum.  All rights reserved.
      8  *
      9  * Copyright (C) 1993, David Greenman.  This software may be used, modified,
     10  * copied, distributed, and sold, in both source and binary form provided that
     11  * the above copyright and these terms are retained.  Under no circumstances is
     12  * the author responsible for the proper functioning of this software, nor does
     13  * the author assume any responsibility for damages incurred with its use.
     14  */
     15 
     16 #include "bpfilter.h"
     17 
     18 #include <sys/param.h>
     19 #include <sys/systm.h>
     20 #include <sys/device.h>
     21 #include <sys/mbuf.h>
     22 #include <sys/socket.h>
     23 
     24 #include <net/if.h>
     25 #include <net/if_media.h>
     26 #include <net/if_ether.h>
     27 
     28 #include <machine/bus.h>
     29 
     30 #include <dev/ic/dp8390reg.h>
     31 #include <dev/ic/dp8390var.h>
     32 #include <mac68k/dev/if_aevar.h>
     33 
     34 int
     35 ae_size_card_memory(bst, bsh, ofs)
     36 	bus_space_tag_t bst;
     37 	bus_space_handle_t bsh;
     38 	int ofs;
     39 {
     40 	int i1, i2, i3, i4;
     41 
     42 	/*
     43 	 * banks; also assume it will generally mirror in upper banks
     44 	 * if not installed.
     45 	 */
     46 	i1 = (8192 * 0);
     47 	i2 = (8192 * 1);
     48 	i3 = (8192 * 2);
     49 	i4 = (8192 * 3);
     50 
     51 	bus_space_write_2(bst, bsh, ofs + i1, 0x1111);
     52 	bus_space_write_2(bst, bsh, ofs + i2, 0x2222);
     53 	bus_space_write_2(bst, bsh, ofs + i3, 0x3333);
     54 	bus_space_write_2(bst, bsh, ofs + i4, 0x4444);
     55 
     56 	if (bus_space_read_2(bst, bsh, ofs + i1) == 0x1111 &&
     57 	    bus_space_read_2(bst, bsh, ofs + i2) == 0x2222 &&
     58 	    bus_space_read_2(bst, bsh, ofs + i3) == 0x3333 &&
     59 	    bus_space_read_2(bst, bsh, ofs + i4) == 0x4444)
     60 		return 8192 * 4;
     61 
     62 	if ((bus_space_read_2(bst, bsh, ofs + i1) == 0x1111 &&
     63 	    bus_space_read_2(bst, bsh, ofs + i2) == 0x2222) ||
     64 	    (bus_space_read_2(bst, bsh, ofs + i1) == 0x3333 &&
     65 	    bus_space_read_2(bst, bsh, ofs + i2) == 0x4444))
     66 		return 8192 * 2;
     67 
     68 	if (bus_space_read_2(bst, bsh, ofs + i1) == 0x1111 ||
     69 	    bus_space_read_2(bst, bsh, ofs + i1) == 0x4444)
     70 		return 8192;
     71 
     72 	return 0;
     73 }
     74 
     75 /*
     76  * Zero memory and verify that it is clear.  The only difference between
     77  * this and the default test_mem function is that the DP8390-based NuBus
     78  * cards * apparently require word-wide writes and byte-wide reads, an
     79  * `interesting' combination.
     80  */
     81 int
     82 ae_test_mem(sc)
     83 	struct dp8390_softc *sc;
     84 {
     85 	bus_space_tag_t buft = sc->sc_buft;
     86 	bus_space_handle_t bufh = sc->sc_bufh;
     87 	int i;
     88 
     89 	bus_space_set_region_2(buft, bufh, sc->mem_start, 0,
     90 	    sc->mem_size / 2);
     91 
     92 	for (i = 0; i < sc->mem_size; ++i) {
     93 		if (bus_space_read_1(sc->sc_buft, sc->sc_bufh, i)) {
     94 			printf(": failed to clear NIC buffer at offset %x - "
     95 			    "check configuration\n", (sc->mem_start + i));
     96 			return 1;
     97 		}
     98 	}
     99 
    100 	return 0;
    101 }
    102 
    103 /*
    104  * Copy packet from mbuf to the board memory Currently uses an extra
    105  * buffer/extra memory copy, unless the whole packet fits in one mbuf.
    106  *
    107  * As in the test_mem function, we use word-wide writes.
    108  */
    109 int
    110 ae_write_mbuf(sc, m, buf)
    111 	struct dp8390_softc *sc;
    112 	struct mbuf *m;
    113 	int buf;
    114 {
    115 	u_char *data, savebyte[2];
    116 	int len, wantbyte;
    117 	u_short totlen = 0;
    118 
    119 	wantbyte = 0;
    120 
    121 	for (; m ; m = m->m_next) {
    122 		data = mtod(m, u_char *);
    123 		len = m->m_len;
    124 		totlen += len;
    125 		if (len > 0) {
    126 			/* Finish the last word. */
    127 			if (wantbyte) {
    128 				savebyte[1] = *data;
    129 				bus_space_write_region_2(sc->sc_buft,
    130 				    sc->sc_bufh, buf, (u_int16_t *)savebyte, 1);
    131 				buf += 2;
    132 				data++;
    133 				len--;
    134 				wantbyte = 0;
    135 			}
    136 			/* Output contiguous words. */
    137 			if (len > 1) {
    138 				bus_space_write_region_2(
    139 				    sc->sc_buft, sc->sc_bufh,
    140 				    buf, (u_int16_t *)data, len >> 1);
    141 				buf += len & ~1;
    142 				data += len & ~1;
    143 				len &= 1;
    144 			}
    145 			/* Save last byte, if necessary. */
    146 			if (len == 1) {
    147 				savebyte[0] = *data;
    148 				wantbyte = 1;
    149 			}
    150 		}
    151 	}
    152 
    153 	if (wantbyte) {
    154 		savebyte[1] = 0;
    155 		bus_space_write_region_2(sc->sc_buft, sc->sc_bufh,
    156 		    buf, (u_int16_t *)savebyte, 1);
    157 	}
    158 	return (totlen);
    159 }
    160