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if_ae.c revision 1.66 
      1 /*	$NetBSD: if_ae.c,v 1.66 1997/11/02 00:29:56 thorpej 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 struct cfdriver ae_cd = {
     35 	NULL, "ae", DV_IFNET
     36 };
     37 
     38 int
     39 ae_size_card_memory(bst, bsh, ofs)
     40 	bus_space_tag_t bst;
     41 	bus_space_handle_t bsh;
     42 	int ofs;
     43 {
     44 	int i1, i2, i3, i4;
     45 
     46 	/*
     47 	 * banks; also assume it will generally mirror in upper banks
     48 	 * if not installed.
     49 	 */
     50 	i1 = (8192 * 0);
     51 	i2 = (8192 * 1);
     52 	i3 = (8192 * 2);
     53 	i4 = (8192 * 3);
     54 
     55 	bus_space_write_2(bst, bsh, ofs + i1, 0x1111);
     56 	bus_space_write_2(bst, bsh, ofs + i2, 0x2222);
     57 	bus_space_write_2(bst, bsh, ofs + i3, 0x3333);
     58 	bus_space_write_2(bst, bsh, ofs + i4, 0x4444);
     59 
     60 	if (bus_space_read_2(bst, bsh, ofs + i1) == 0x1111 &&
     61 	    bus_space_read_2(bst, bsh, ofs + i2) == 0x2222 &&
     62 	    bus_space_read_2(bst, bsh, ofs + i3) == 0x3333 &&
     63 	    bus_space_read_2(bst, bsh, ofs + i4) == 0x4444)
     64 		return 8192 * 4;
     65 
     66 	if ((bus_space_read_2(bst, bsh, ofs + i1) == 0x1111 &&
     67 	    bus_space_read_2(bst, bsh, ofs + i2) == 0x2222) ||
     68 	    (bus_space_read_2(bst, bsh, ofs + i1) == 0x3333 &&
     69 	    bus_space_read_2(bst, bsh, ofs + i2) == 0x4444))
     70 		return 8192 * 2;
     71 
     72 	if (bus_space_read_2(bst, bsh, ofs + i1) == 0x1111 ||
     73 	    bus_space_read_2(bst, bsh, ofs + i1) == 0x4444)
     74 		return 8192;
     75 
     76 	return 0;
     77 }
     78 
     79 /*
     80  * Zero memory and verify that it is clear.  The only difference between
     81  * this and the default test_mem function is that the DP8390-based NuBus
     82  * cards * apparently require word-wide writes and byte-wide reads, an
     83  * `interesting' combination.
     84  */
     85 int
     86 ae_test_mem(sc)
     87 	struct dp8390_softc *sc;
     88 {
     89 	bus_space_tag_t buft = sc->sc_buft;
     90 	bus_space_handle_t bufh = sc->sc_bufh;
     91 	int i;
     92 
     93 	bus_space_set_region_2(buft, bufh, sc->mem_start, 0,
     94 	    sc->mem_size / 2);
     95 
     96 	for (i = 0; i < sc->mem_size; ++i) {
     97 		if (bus_space_read_1(sc->sc_buft, sc->sc_bufh, i)) {
     98 			printf(": failed to clear NIC buffer at offset %x - "
     99 			    "check configuration\n", (sc->mem_start + i));
    100 			return 1;
    101 		}
    102 	}
    103 
    104 	return 0;
    105 }
    106 
    107 /*
    108  * Copy packet from mbuf to the board memory Currently uses an extra
    109  * buffer/extra memory copy, unless the whole packet fits in one mbuf.
    110  *
    111  * As in the test_mem function, we use word-wide writes.
    112  */
    113 int
    114 ae_write_mbuf(sc, m, buf)
    115 	struct dp8390_softc *sc;
    116 	struct mbuf *m;
    117 	int buf;
    118 {
    119 	u_char *data, savebyte[2];
    120 	int len, wantbyte;
    121 	u_short totlen = 0;
    122 
    123 	wantbyte = 0;
    124 
    125 	for (; m ; m = m->m_next) {
    126 		data = mtod(m, u_char *);
    127 		len = m->m_len;
    128 		totlen += len;
    129 		if (len > 0) {
    130 			/* Finish the last word. */
    131 			if (wantbyte) {
    132 				savebyte[1] = *data;
    133 				bus_space_write_region_2(sc->sc_buft,
    134 				    sc->sc_bufh, buf, savebyte, 1);
    135 				buf += 2;
    136 				data++;
    137 				len--;
    138 				wantbyte = 0;
    139 			}
    140 			/* Output contiguous words. */
    141 			if (len > 1) {
    142 				bus_space_write_region_2(sc->sc_buft,
    143 				    sc->sc_bufh, buf, data, len >> 1);
    144 				buf += len & ~1;
    145 				data += len & ~1;
    146 				len &= 1;
    147 			}
    148 			/* Save last byte, if necessary. */
    149 			if (len == 1) {
    150 				savebyte[0] = *data;
    151 				wantbyte = 1;
    152 			}
    153 		}
    154 	}
    155 
    156 	if (wantbyte) {
    157 		savebyte[1] = 0;
    158 		bus_space_write_region_2(sc->sc_buft, sc->sc_bufh,
    159 		    buf, savebyte, 1);
    160 	}
    161 	return (totlen);
    162 }
    163