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if_le_ibus.c revision 1.2 
      1 /*	$NetBSD: if_le_ibus.c,v 1.2 2001/10/01 11:42:18 simonb Exp $	*/
      2 
      3 /*
      4  * Copyright 1996 The Board of Trustees of The Leland Stanford
      5  * Junior University. All Rights Reserved.
      6  *
      7  * Permission to use, copy, modify, and distribute this
      8  * software and its documentation for any purpose and without
      9  * fee is hereby granted, provided that the above copyright
     10  * notice appear in all copies.  Stanford University
     11  * makes no representations about the suitability of this
     12  * software for any purpose.  It is provided "as is" without
     13  * express or implied warranty.
     14  *
     15  * This driver was contributed by Jonathan Stone.
     16  */
     17 
     18 /*
     19  * LANCE on Decstation kn01/kn220(?) baseboard.
     20  */
     21 #include "opt_inet.h"
     22 
     23 #include <sys/param.h>
     24 #include <sys/socket.h>
     25 
     26 #include <net/if.h>
     27 #include <net/if_ether.h>
     28 #include <net/if_media.h>
     29 
     30 #ifdef INET
     31 #include <netinet/in.h>
     32 #include <netinet/if_inarp.h>
     33 #endif
     34 
     35 #include <dev/ic/lancevar.h>
     36 #include <dev/ic/am7990var.h>
     37 
     38 #include <dev/tc/if_levar.h>
     39 #include <pmax/ibus/ibusvar.h>
     40 #include <pmax/pmax/kn01.h>
     41 
     42 static void le_dec_copyfrombuf_gap2(struct lance_softc *, void *, int, int);
     43 static void le_dec_copytobuf_gap2(struct lance_softc *, void *, int, int);
     44 static void le_dec_zerobuf_gap2(struct lance_softc *, int, int);
     45 
     46 
     47 static int le_pmax_match(struct device *, struct cfdata *, void *);
     48 static void le_pmax_attach(struct device *, struct device *, void *);
     49 
     50 struct cfattach le_pmax_ca = {
     51 	sizeof(struct le_softc), le_pmax_match, le_pmax_attach
     52 };
     53 extern struct cfdriver ibus_cd;
     54 
     55 int
     56 le_pmax_match(struct device *parent, struct cfdata *match, void *aux)
     57 {
     58 	struct ibus_attach_args *d = aux;
     59 
     60 	if (parent->dv_cfdata->cf_driver != &ibus_cd)
     61 		return (0);
     62 
     63 	if (strcmp("lance", d->ia_name) != 0)
     64 		return (0);
     65 	return (1);
     66 }
     67 
     68 void
     69 le_pmax_attach(struct device *parent, struct device *self, void *aux)
     70 {
     71 	struct le_softc *lesc = (void *)self;
     72 	struct lance_softc *sc = &lesc->sc_am7990.lsc;
     73 	u_char *cp;
     74 	struct ibus_attach_args *ia = aux;
     75 
     76 	/*
     77 	 * It's on the baseboard, with a dedicated interrupt line.
     78 	 */
     79 	lesc->sc_r1 = (struct lereg1 *)(ia->ia_addr);
     80 	sc->sc_mem = (void *)MIPS_PHYS_TO_KSEG1(KN01_SYS_LANCE_B_START);
     81 	cp = (u_char *)(MIPS_PHYS_TO_KSEG1(KN01_SYS_CLOCK) + 1);
     82 
     83 	sc->sc_copytodesc = le_dec_copytobuf_gap2;
     84 	sc->sc_copyfromdesc = le_dec_copyfrombuf_gap2;
     85 	sc->sc_copytobuf = le_dec_copytobuf_gap2;
     86 	sc->sc_copyfrombuf = le_dec_copyfrombuf_gap2;
     87 	sc->sc_zerobuf = le_dec_zerobuf_gap2;
     88 
     89 	dec_le_common_attach(&lesc->sc_am7990, cp);
     90 
     91 	ibus_intr_establish(parent, (void*)ia->ia_cookie, IPL_NET,
     92 	    am7990_intr, sc);
     93 }
     94 
     95 /*
     96  * gap2: two bytes of data followed by two bytes of pad.
     97  *
     98  * Buffers must be 4-byte aligned.  The code doesn't worry about
     99  * doing an extra byte.
    100  */
    101 
    102 void
    103 le_dec_copytobuf_gap2(struct lance_softc *sc, void *fromv, int boff, int len)
    104 {
    105 	volatile caddr_t buf = sc->sc_mem;
    106 	caddr_t from = fromv;
    107 	volatile u_int16_t *bptr;
    108 
    109 	if (boff & 0x1) {
    110 		/* handle unaligned first byte */
    111 		bptr = ((volatile u_int16_t *)buf) + (boff - 1);
    112 		*bptr = (*from++ << 8) | (*bptr & 0xff);
    113 		bptr += 2;
    114 		len--;
    115 	} else
    116 		bptr = ((volatile u_int16_t *)buf) + boff;
    117 	while (len > 1) {
    118 		*bptr = (from[1] << 8) | (from[0] & 0xff);
    119 		bptr += 2;
    120 		from += 2;
    121 		len -= 2;
    122 	}
    123 	if (len == 1)
    124 		*bptr = (u_int16_t)*from;
    125 }
    126 
    127 void
    128 le_dec_copyfrombuf_gap2(struct lance_softc *sc, void *tov, int boff, int len)
    129 {
    130 	volatile caddr_t buf = sc->sc_mem;
    131 	caddr_t to = tov;
    132 	volatile u_int16_t *bptr;
    133 	u_int16_t tmp;
    134 
    135 	if (boff & 0x1) {
    136 		/* handle unaligned first byte */
    137 		bptr = ((volatile u_int16_t *)buf) + (boff - 1);
    138 		*to++ = (*bptr >> 8) & 0xff;
    139 		bptr += 2;
    140 		len--;
    141 	} else
    142 		bptr = ((volatile u_int16_t *)buf) + boff;
    143 	while (len > 1) {
    144 		tmp = *bptr;
    145 		*to++ = tmp & 0xff;
    146 		*to++ = (tmp >> 8) & 0xff;
    147 		bptr += 2;
    148 		len -= 2;
    149 	}
    150 	if (len == 1)
    151 		*to = *bptr & 0xff;
    152 }
    153 
    154 static void
    155 le_dec_zerobuf_gap2(struct lance_softc *sc, int boff, int len)
    156 {
    157 	volatile caddr_t buf = sc->sc_mem;
    158 	volatile u_int16_t *bptr;
    159 
    160 	if ((unsigned)boff & 0x1) {
    161 		bptr = ((volatile u_int16_t *)buf) + (boff - 1);
    162 		*bptr &= 0xff;
    163 		bptr += 2;
    164 		len--;
    165 	} else
    166 		bptr = ((volatile u_int16_t *)buf) + boff;
    167 	while (len > 0) {
    168 		*bptr = 0;
    169 		bptr += 2;
    170 		len -= 2;
    171 	}
    172 }
    173