NetBSD-5.0.2/sys/dev/ic/mx98905.c
/* $NetBSD: mx98905.c,v 1.13 2008/04/28 20:23:50 martin Exp $ */
/*-
* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* 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.
*/
/*
* Special routines for the Macronix MX 98905. For use with the "ne" driver.
*/
/*
* <URL:http://mail-index.NetBSD.org/port-arm32/1996/06/23/0005.html>:
* There are 2 types of etherh card. One uses the macronics chipset MX98905
* and that chipset has a bug in it, in that it the MSB remote DMA
* register does not work. There is a workaround for this which
* should be around soon. In fact, I think only the buffer ram test
* ever transfers more than 256 bytes across the DMA channel, so diabling
* it will make the mx stuff work.
*/
#include <sys/param.h>
__KERNEL_RCSID(0, "$NetBSD: mx98905.c,v 1.13 2008/04/28 20:23:50 martin Exp $");
#include <sys/device.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/systm.h>
#include <net/if.h>
#include <net/if_ether.h>
#include <net/if_media.h>
#include <sys/bus.h>
#include <dev/ic/dp8390reg.h>
#include <dev/ic/dp8390var.h>
#include <dev/ic/ne2000reg.h>
#include <dev/ic/ne2000var.h>
#include <dev/ic/mx98905var.h>
#ifndef __BUS_SPACE_HAS_STREAM_METHODS
#define bus_space_write_stream_2 bus_space_write_2
#define bus_space_write_multi_stream_2 bus_space_write_multi_2
#define bus_space_read_multi_stream_2 bus_space_read_multi_2
#endif /* __BUS_SPACE_HAS_STREAM_METHODS */
static inline void mx98905_write_setup(struct dp8390_softc *, int, int);
static inline void mx98905_write_wait(struct dp8390_softc *);
void
mx98905_attach(struct dp8390_softc *sc)
{
sc->ring_copy = mx98905_ring_copy;
sc->write_mbuf = mx98905_write_mbuf;
sc->read_hdr = mx98905_read_hdr;
}
static inline void
mx98905_write_setup(sc, len, buf)
struct dp8390_softc *sc;
int len, buf;
{
bus_space_tag_t nict = sc->sc_regt;
bus_space_handle_t nich = sc->sc_regh;
/* Select page 0 registers. */
NIC_BARRIER(nict, nich);
bus_space_write_1(nict, nich, ED_P0_CR,
ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA);
NIC_BARRIER(nict, nich);
/* Reset remote DMA complete flag. */
bus_space_write_1(nict, nich, ED_P0_ISR, ED_ISR_RDC);
NIC_BARRIER(nict, nich);
/* Set up DMA byte count. */
bus_space_write_1(nict, nich, ED_P0_RBCR0, len);
bus_space_write_1(nict, nich, ED_P0_RBCR1, len >> 8);
/* Set up destination address in NIC mem. */
bus_space_write_1(nict, nich, ED_P0_RSAR0, buf);
bus_space_write_1(nict, nich, ED_P0_RSAR1, buf >> 8);
/* Set remote DMA write. */
NIC_BARRIER(nict, nich);
bus_space_write_1(nict, nich,
ED_P0_CR, ED_CR_RD1 | ED_CR_PAGE_0 | ED_CR_STA);
NIC_BARRIER(nict, nich);
}
static inline void
mx98905_write_wait(sc)
struct dp8390_softc *sc;
{
int maxwait = 100; /* about 120us */
bus_space_tag_t nict = sc->sc_regt;
bus_space_handle_t nich = sc->sc_regh;
/*
* Wait for remote DMA to complete. This is necessary because on the
* transmit side, data is handled internally by the NIC in bursts, and
* we can't start another remote DMA until this one completes. Not
* waiting causes really bad things to happen - like the NIC wedging
* the bus.
*/
while (((bus_space_read_1(nict, nich, ED_P0_ISR) & ED_ISR_RDC) !=
ED_ISR_RDC) && --maxwait) {
bus_space_read_1(nict, nich, ED_P0_CRDA1);
bus_space_read_1(nict, nich, ED_P0_CRDA0);
NIC_BARRIER(nict, nich);
DELAY(1);
}
if (maxwait == 0) {
log(LOG_WARNING,
"%s: remote transmit DMA failed to complete\n",
device_xname(sc->sc_dev));
dp8390_reset(sc);
}
}
/*
* Write an mbuf chain to the destination NIC memory address using programmed
* I/O.
*/
int
mx98905_write_mbuf(sc, m, buf)
struct dp8390_softc *sc;
struct mbuf *m;
int buf;
{
struct ne2000_softc *nsc = (struct ne2000_softc *)sc;
bus_space_tag_t nict = sc->sc_regt;
bus_space_handle_t nich = sc->sc_regh;
bus_space_tag_t asict = nsc->sc_asict;
bus_space_handle_t asich = nsc->sc_asich;
int savelen, dmalen, resid, len;
u_int8_t *data, savebyte[2];
int l, leftover;
#ifdef DIAGNOSTIC
u_int8_t *lim;
#endif
int i;
resid = savelen = m->m_pkthdr.len;
dmalen = min(resid, 254);
mx98905_write_setup(sc, dmalen, buf);
buf += dmalen;
resid -= dmalen;
/*
* Transfer the mbuf chain to the NIC memory. NE2000 cards
* require that data be transferred as words, and only words,
* so that case requires some extra code to patch over odd-length
* mbufs.
*/
/* NE2000s are a bit trickier. */
/* Start out with no leftover data. */
leftover = 0;
savebyte[0] = savebyte[1] = 0;
for (; m != 0; m = m->m_next) {
l = m->m_len;
if (l == 0)
continue;
data = mtod(m, u_int8_t *);
#ifdef DIAGNOSTIC
lim = data + l;
#endif
while (l > 0) {
if (leftover) {
/*
* Data left over (from mbuf or
* realignment). Buffer the next
* byte, and write it and the leftover
* data out.
*/
savebyte[1] = *data++;
l--;
bus_space_write_stream_2(asict, asich,
NE2000_ASIC_DATA, *(u_int16_t *)savebyte);
dmalen -= 2;
leftover = 0;
} else if (BUS_SPACE_ALIGNED_POINTER(data,
u_int16_t) == 0) {
/* Unaligned data; buffer the next byte. */
savebyte[0] = *data++;
l--;
leftover = 1;
} else {
/*
* Aligned data; output contiguous
* words as much as we can, then
* buffer the remaining byte, if any.
*/
len = min(l, dmalen);
leftover = len & 1;
len &= ~1;
bus_space_write_multi_stream_2(asict,
asich, NE2000_ASIC_DATA,
(u_int16_t *)data, len >> 1);
dmalen -= len;
data += len;
if (leftover)
savebyte[0] = *data++;
l -= len + leftover;
}
if (dmalen == 0 && resid > 0) {
mx98905_write_wait(sc);
dmalen = min(resid, 254);
mx98905_write_setup(sc, dmalen, buf);
buf += dmalen;
resid -= dmalen;
}
}
if (l < 0)
panic("mx98905_write_mbuf: negative len");
#ifdef DIAGNOSTIC
if (data != lim)
panic("mx98905_write_mbuf: data != lim");
#endif
}
if (leftover) {
savebyte[1] = 0;
bus_space_write_stream_2(asict, asich, NE2000_ASIC_DATA,
*(u_int16_t *)savebyte);
}
if (savelen < ETHER_MIN_LEN - ETHER_CRC_LEN) {
for(i = 0; i < (ETHER_MIN_LEN - ETHER_CRC_LEN - savelen) >> 1;
i++)
bus_space_write_stream_2(asict, asich,
NE2000_ASIC_DATA, 0);
savelen = ETHER_MIN_LEN - ETHER_CRC_LEN;
}
NIC_BARRIER(nict, nich);
mx98905_write_wait(sc);
return (savelen);
}
/*
* Given a source and destination address, copy 'amout' of a packet from
* the ring buffer into a linear destination buffer. Takes into account
* ring-wrap.
*/
int
mx98905_ring_copy(sc, src, vdst, amount)
struct dp8390_softc *sc;
int src;
void *vdst;
u_short amount;
{
struct ne2000_softc *nsc = (struct ne2000_softc *)sc;
uint8_t *dst = vdst;
bus_space_tag_t nict = sc->sc_regt;
bus_space_handle_t nich = sc->sc_regh;
bus_space_tag_t asict = nsc->sc_asict;
bus_space_handle_t asich = nsc->sc_asich;
u_short tmp_amount;
int useword = nsc->sc_useword;
/* Does copy wrap to lower addr in ring buffer? */
if (src + amount > sc->mem_end) {
tmp_amount = sc->mem_end - src;
/* Copy amount up to end of NIC memory. */
mx98905_readmem(nict, nich, asict, asich, src,
(u_int8_t *)dst, tmp_amount, useword);
amount -= tmp_amount;
src = sc->mem_ring;
dst += tmp_amount;
}
mx98905_readmem(nict, nich, asict, asich, src, dst, amount, useword);
return (src + amount);
}
void
mx98905_read_hdr(sc, buf, hdr)
struct dp8390_softc *sc;
int buf;
struct dp8390_ring *hdr;
{
struct ne2000_softc *nsc = (struct ne2000_softc *)sc;
mx98905_readmem(sc->sc_regt, sc->sc_regh, nsc->sc_asict, nsc->sc_asich,
buf, (u_int8_t *)hdr, sizeof(struct dp8390_ring),
nsc->sc_useword);
#if BYTE_ORDER == BIG_ENDIAN
hdr->count = bswap16(hdr->count);
#endif
}
static inline void
mx98905_read_setup(bus_space_tag_t nict, bus_space_handle_t nich,
int len, int buf)
{
/* Select page 0 registers. */
NIC_BARRIER(nict, nich);
bus_space_write_1(nict, nich, ED_P0_CR,
ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STA);
NIC_BARRIER(nict, nich);
/* Set up DMA byte count. */
bus_space_write_1(nict, nich, ED_P0_RBCR0, len);
bus_space_write_1(nict, nich, ED_P0_RBCR1, len >> 8);
/* Set up source address in NIC mem. */
bus_space_write_1(nict, nich, ED_P0_RSAR0, buf);
bus_space_write_1(nict, nich, ED_P0_RSAR1, buf >> 8);
NIC_BARRIER(nict, nich);
bus_space_write_1(nict, nich, ED_P0_CR,
ED_CR_RD0 | ED_CR_PAGE_0 | ED_CR_STA);
bus_space_barrier(nict, nich, 0, NE2000_NPORTS,
BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
}
/*
* Given a NIC memory source address and a host memory destination address,
* copy 'amount' from NIC to host using programmed i/o. The 'amount' is
* rounded up to a word - ok as long as mbufs are word sized.
*/
void
mx98905_readmem(nict, nich, asict, asich, src, dst, amount, useword)
bus_space_tag_t nict;
bus_space_handle_t nich;
bus_space_tag_t asict;
bus_space_handle_t asich;
int src;
u_int8_t *dst;
size_t amount;
int useword;
{
int len, resid;
resid = amount;
/* Round up to a word. */
if (resid & 1)
++resid;
while (resid > 0) {
len = min(resid, 254);
mx98905_read_setup(nict, nich, len, src);
if (useword)
bus_space_read_multi_stream_2(asict, asich,
NE2000_ASIC_DATA, (u_int16_t *)dst, len >> 1);
else
bus_space_read_multi_1(asict, asich, NE2000_ASIC_DATA,
dst, len);
resid -= len;
src += len;
dst += len;
}
}