/*
* Device driver for National Semiconductor DS8390/WD83C690 based ethernet
* adapters.
*
* Copyright (c) 1994, 1995 Charles M. Hannum. All rights reserved.
*
* Copyright (C) 1993, David Greenman. This software may be used, modified,
* copied, distributed, and sold, in both source and binary form provided that
* the above copyright and these terms are retained. Under no circumstances is
* the author responsible for the proper functioning of this software, nor does
* the author assume any responsibility for damages incurred with its use.
*/
/*
* 1) If the memory range is decoded completely, it does not
* matter what we write first: High tags written into
* the void are lost.
* 2) If the memory range is not decoded completely (banks are
* mirrored), high tags are overwritten by lower ones.
* 3) Lazy implementation of pathological cases - none found yet.
*/
/*
* Zero memory and verify that it is clear. The only difference between
* this and the default test_mem function is that the DP8390-based NuBus
* cards * apparently require word-wide writes and byte-wide reads, an
* `interesting' combination.
*/
int
ae_test_mem(struct dp8390_softc *sc)
{
bus_space_tag_t buft = sc->sc_buft;
bus_space_handle_t bufh = sc->sc_bufh;
int i;
for (i = 0; i < sc->mem_size; ++i) {
if (bus_space_read_1(sc->sc_buft, sc->sc_bufh, i)) {
printf(": failed to clear NIC buffer at offset %x - "
"check configuration\n", (sc->mem_start + i));
return 1;
}
}
return 0;
}
/*
* Copy packet from mbuf to the board memory Currently uses an extra
* buffer/extra memory copy, unless the whole packet fits in one mbuf.
*
* As in the test_mem function, we use word-wide writes.
*/
int
ae_write_mbuf(struct dp8390_softc *sc, struct mbuf *m, int buf)
{
u_char *data, savebyte[2];
int len, wantbyte;
u_short totlen = 0;
wantbyte = 0;
for (; m ; m = m->m_next) {
data = mtod(m, u_char *);
len = m->m_len;
totlen += len;
if (len > 0) {
/* Finish the last word. */
if (wantbyte) {
savebyte[1] = *data;
bus_space_write_region_2(sc->sc_buft,
sc->sc_bufh, buf, (u_int16_t *)savebyte, 1);
buf += 2;
data++;
len--;
wantbyte = 0;
}
/* Output contiguous words. */
if (len > 1) {
bus_space_write_region_2(
sc->sc_buft, sc->sc_bufh,
buf, (u_int16_t *)data, len >> 1);
buf += len & ~1;
data += len & ~1;
len &= 1;
}
/* Save last byte, if necessary. */
if (len == 1) {
savebyte[0] = *data;
wantbyte = 1;
}
}
}
len = ETHER_PAD_LEN - totlen;
if (wantbyte) {
savebyte[1] = 0;
bus_space_write_region_2(sc->sc_buft, sc->sc_bufh,
buf, (u_int16_t *)savebyte, 1);
buf += 2;
totlen++;
len--;
}
/* if sent data is shorter than EHTER_PAD_LEN, put 0 to padding */
if (len > 0) {
bus_space_set_region_2(sc->sc_buft, sc->sc_bufh, buf, 0,
len >> 1);
totlen = ETHER_PAD_LEN;
}
return (totlen);
}
