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if_ae.c revision 1.64 
      1 /*	$NetBSD: if_ae.c,v 1.64 1997/04/29 04:40:22 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_ether.h>
     26 
     27 #include <machine/bus.h>
     28 
     29 #include <dev/ic/dp8390reg.h>
     30 #include <dev/ic/dp8390var.h>
     31 #include <arch/mac68k/dev/if_aevar.h>
     32 
     33 struct cfdriver ae_cd = {
     34 	NULL, "ae", DV_IFNET
     35 };
     36 
     37 int
     38 ae_size_card_memory(bst, bsh, ofs)
     39 	bus_space_tag_t bst;
     40 	bus_space_handle_t bsh;
     41 	int ofs;
     42 {
     43 	int i1, i2, i3, i4;
     44 
     45 	/*
     46 	 * banks; also assume it will generally mirror in upper banks
     47 	 * if not installed.
     48 	 */
     49 	i1 = (8192 * 0);
     50 	i2 = (8192 * 1);
     51 	i3 = (8192 * 2);
     52 	i4 = (8192 * 3);
     53 
     54 	bus_space_write_2(bst, bsh, ofs + i1, 0x1111);
     55 	bus_space_write_2(bst, bsh, ofs + i2, 0x2222);
     56 	bus_space_write_2(bst, bsh, ofs + i3, 0x3333);
     57 	bus_space_write_2(bst, bsh, ofs + i4, 0x4444);
     58 
     59 	if (bus_space_read_2(bst, bsh, ofs + i1) == 0x1111 &&
     60 	    bus_space_read_2(bst, bsh, ofs + i2) == 0x2222 &&
     61 	    bus_space_read_2(bst, bsh, ofs + i3) == 0x3333 &&
     62 	    bus_space_read_2(bst, bsh, ofs + i4) == 0x4444)
     63 		return 8192 * 4;
     64 
     65 	if ((bus_space_read_2(bst, bsh, ofs + i1) == 0x1111 &&
     66 	    bus_space_read_2(bst, bsh, ofs + i2) == 0x2222) ||
     67 	    (bus_space_read_2(bst, bsh, ofs + i1) == 0x3333 &&
     68 	    bus_space_read_2(bst, bsh, ofs + i2) == 0x4444))
     69 		return 8192 * 2;
     70 
     71 	if (bus_space_read_2(bst, bsh, ofs + i1) == 0x1111 ||
     72 	    bus_space_read_2(bst, bsh, ofs + i1) == 0x4444)
     73 		return 8192;
     74 
     75 	return 0;
     76 }
     77 
     78 /*
     79  * Zero memory and verify that it is clear.  The only difference between
     80  * this and the default test_mem function is that the DP8390-based NuBus
     81  * cards * apparently require word-wide writes and byte-wide reads, an
     82  * `interesting' combination.
     83  */
     84 int
     85 ae_test_mem(sc)
     86 	struct dp8390_softc *sc;
     87 {
     88 	bus_space_tag_t buft = sc->sc_buft;
     89 	bus_space_handle_t bufh = sc->sc_bufh;
     90 	int i;
     91 
     92 	bus_space_set_region_2(buft, bufh, sc->mem_start, 0,
     93 	    sc->mem_size / 2);
     94 
     95 	for (i = 0; i < sc->mem_size; ++i) {
     96 		if (bus_space_read_1(sc->sc_buft, sc->sc_bufh, i)) {
     97 			printf(": failed to clear NIC buffer at offset %x - "
     98 			    "check configuration\n", (sc->mem_start + i));
     99 			return 1;
    100 		}
    101 	}
    102 
    103 	return 0;
    104 }
    105 
    106 /*
    107  * Copy packet from mbuf to the board memory Currently uses an extra
    108  * buffer/extra memory copy, unless the whole packet fits in one mbuf.
    109  *
    110  * As in the test_mem function, we use word-wide writes.
    111  */
    112 int
    113 ae_write_mbuf(sc, m, buf)
    114 	struct dp8390_softc *sc;
    115 	struct mbuf *m;
    116 	int buf;
    117 {
    118 	u_char *data, savebyte[2];
    119 	int len, wantbyte;
    120 	u_short totlen = 0;
    121 
    122 	wantbyte = 0;
    123 
    124 	for (; m ; m = m->m_next) {
    125 		data = mtod(m, u_char *);
    126 		len = m->m_len;
    127 		totlen += len;
    128 		if (len > 0) {
    129 			/* Finish the last word. */
    130 			if (wantbyte) {
    131 				savebyte[1] = *data;
    132 				bus_space_write_region_2(sc->sc_buft,
    133 				    sc->sc_bufh, buf, savebyte, 1);
    134 				buf += 2;
    135 				data++;
    136 				len--;
    137 				wantbyte = 0;
    138 			}
    139 			/* Output contiguous words. */
    140 			if (len > 1) {
    141 				bus_space_write_region_2(sc->sc_buft,
    142 				    sc->sc_bufh, buf, data, len >> 1);
    143 				buf += len & ~1;
    144 				data += len & ~1;
    145 				len &= 1;
    146 			}
    147 			/* Save last byte, if necessary. */
    148 			if (len == 1) {
    149 				savebyte[0] = *data;
    150 				wantbyte = 1;
    151 			}
    152 		}
    153 	}
    154 
    155 	if (wantbyte) {
    156 		savebyte[1] = 0;
    157 		bus_space_write_region_2(sc->sc_buft, sc->sc_bufh,
    158 		    buf, savebyte, 1);
    159 	}
    160 	return (totlen);
    161 }
    162