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NetBSD/sys/dev/ic/rtl81x9.c

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/* $NetBSD: rtl81x9.c,v 1.2 2000/04/24 15:25:00 tsutsui Exp $ */
/*
* Copyright (c) 1997, 1998
* Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Bill Paul.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul OR THE VOICES IN HIS HEAD
* 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.
*
* FreeBSD Id: if_rl.c,v 1.17 1999/06/19 20:17:37 wpaul Exp
*/
/*
* RealTek 8129/8139 PCI NIC driver
*
* Supports several extremely cheap PCI 10/100 adapters based on
* the RealTek chipset. Datasheets can be obtained from
* www.realtek.com.tw.
*
* Written by Bill Paul <wpaul@ctr.columbia.edu>
* Electrical Engineering Department
* Columbia University, New York City
*/
/*
* The RealTek 8139 PCI NIC redefines the meaning of 'low end.' This is
* probably the worst PCI ethernet controller ever made, with the possible
* exception of the FEAST chip made by SMC. The 8139 supports bus-master
* DMA, but it has a terrible interface that nullifies any performance
* gains that bus-master DMA usually offers.
*
* For transmission, the chip offers a series of four TX descriptor
* registers. Each transmit frame must be in a contiguous buffer, aligned
* on a longword (32-bit) boundary. This means we almost always have to
* do mbuf copies in order to transmit a frame, except in the unlikely
* case where a) the packet fits into a single mbuf, and b) the packet
* is 32-bit aligned within the mbuf's data area. The presence of only
* four descriptor registers means that we can never have more than four
* packets queued for transmission at any one time.
*
* Reception is not much better. The driver has to allocate a single large
* buffer area (up to 64K in size) into which the chip will DMA received
* frames. Because we don't know where within this region received packets
* will begin or end, we have no choice but to copy data from the buffer
* area into mbufs in order to pass the packets up to the higher protocol
* levels.
*
* It's impossible given this rotten design to really achieve decent
* performance at 100Mbps, unless you happen to have a 400Mhz PII or
* some equally overmuscled CPU to drive it.
*
* On the bright side, the 8139 does have a built-in PHY, although
* rather than using an MDIO serial interface like most other NICs, the
* PHY registers are directly accessible through the 8139's register
* space. The 8139 supports autonegotiation, as well as a 64-bit multicast
* filter.
*
* The 8129 chip is an older version of the 8139 that uses an external PHY
* chip. The 8129 has a serial MDIO interface for accessing the MII where
* the 8139 lets you directly access the on-board PHY registers. We need
* to select which interface to use depending on the chip type.
*/
#include "opt_inet.h"
#include "opt_ns.h"
#include "bpfilter.h"
#include "rnd.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/device.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/if_ether.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/if_inarp.h>
#endif
#ifdef NS
#include <netns/ns.h>
#include <netns/ns_if.h>
#endif
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#if NRND > 0
#include <sys/rnd.h>
#endif
#include <machine/bus.h>
#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>
/*
* Default to using PIO access for this driver. On SMP systems,
* there appear to be problems with memory mapped mode: it looks like
* doing too many memory mapped access back to back in rapid succession
* can hang the bus. I'm inclined to blame this on crummy design/construction
* on the part of RealTek. Memory mapped mode does appear to work on
* uniprocessor systems though.
*/
#include <dev/ic/rtl81x9reg.h>
#if defined DEBUG
#define STATIC
#else
#define STATIC static
#endif
STATIC int rl_encap __P((struct rl_softc *, struct mbuf * ));
STATIC void rl_rxeof __P((struct rl_softc *));
STATIC void rl_txeof __P((struct rl_softc *));
STATIC void rl_start __P((struct ifnet *));
STATIC int rl_ioctl __P((struct ifnet *, u_long, caddr_t));
STATIC void rl_init __P((void *));
STATIC void rl_stop __P((struct rl_softc *));
STATIC void rl_watchdog __P((struct ifnet *));
STATIC void rl_shutdown __P((void *));
STATIC int rl_ifmedia_upd __P((struct ifnet *));
STATIC void rl_ifmedia_sts __P((struct ifnet *, struct ifmediareq *));
STATIC void rl_eeprom_putbyte __P((struct rl_softc *, int));
STATIC void rl_eeprom_getword __P((struct rl_softc *, int, u_int16_t *));
STATIC void rl_mii_sync __P((struct rl_softc *));
STATIC void rl_mii_send __P((struct rl_softc *, u_int32_t, int));
STATIC int rl_mii_readreg __P((struct rl_softc *, struct rl_mii_frame *));
STATIC int rl_mii_writereg __P((struct rl_softc *, struct rl_mii_frame *));
STATIC int rl_phy_readreg __P((struct device *, int, int));
STATIC void rl_phy_writereg __P((struct device *, int, int, int));
STATIC void rl_phy_statchg __P((struct device *));
STATIC void rl_tick __P((void *));
STATIC u_int8_t rl_calchash __P((caddr_t));
STATIC void rl_setmulti __P((struct rl_softc *));
STATIC int rl_list_tx_init __P((struct rl_softc *));
STATIC int rl_ether_ioctl __P((struct ifnet *, u_long, caddr_t));
STATIC int rl_allocsndbuf __P((struct rl_softc *, int));
#define EE_SET(x) \
CSR_WRITE_1(sc, RL_EECMD, \
CSR_READ_1(sc, RL_EECMD) | x)
#define EE_CLR(x) \
CSR_WRITE_1(sc, RL_EECMD, \
CSR_READ_1(sc, RL_EECMD) & ~x)
/*
* Send a read command and address to the EEPROM, check for ACK.
*/
STATIC void rl_eeprom_putbyte(sc, addr)
struct rl_softc *sc;
int addr;
{
int d, i;
d = addr | RL_EECMD_READ;
/*
* Feed in each bit and stobe the clock.
*/
for (i = 0x400; i; i >>= 1) {
if (d & i) {
EE_SET(RL_EE_DATAIN);
} else {
EE_CLR(RL_EE_DATAIN);
}
DELAY(100);
EE_SET(RL_EE_CLK);
DELAY(150);
EE_CLR(RL_EE_CLK);
DELAY(100);
}
return;
}
/*
* Read a word of data stored in the EEPROM at address 'addr.'
*/
STATIC void rl_eeprom_getword(sc, addr, dest)
struct rl_softc *sc;
int addr;
u_int16_t *dest;
{
int i;
u_int16_t word = 0;
/* Enter EEPROM access mode. */
CSR_WRITE_1(sc, RL_EECMD, RL_EEMODE_PROGRAM|RL_EE_SEL);
/*
* Send address of word we want to read.
*/
rl_eeprom_putbyte(sc, addr);
CSR_WRITE_1(sc, RL_EECMD, RL_EEMODE_PROGRAM|RL_EE_SEL);
/*
* Start reading bits from EEPROM.
*/
for (i = 0x8000; i; i >>= 1) {
EE_SET(RL_EE_CLK);
DELAY(100);
if (CSR_READ_1(sc, RL_EECMD) & RL_EE_DATAOUT)
word |= i;
EE_CLR(RL_EE_CLK);
DELAY(100);
}
/* Turn off EEPROM access mode. */
CSR_WRITE_1(sc, RL_EECMD, RL_EEMODE_OFF);
*dest = word;
return;
}
/*
* Read a sequence of words from the EEPROM.
*/
void rl_read_eeprom(sc, dest, off, cnt, swap)
struct rl_softc *sc;
caddr_t dest;
int off;
int cnt;
int swap;
{
int i;
u_int16_t word = 0, *ptr;
for (i = 0; i < cnt; i++) {
rl_eeprom_getword(sc, off + i, &word);
ptr = (u_int16_t *)(dest + (i * 2));
if (swap)
*ptr = ntohs(word);
else
*ptr = word;
}
return;
}
/*
* MII access routines are provided for the 8129, which
* doesn't have a built-in PHY. For the 8139, we fake things
* up by diverting rl_phy_readreg()/rl_phy_writereg() to the
* direct access PHY registers.
*/
#define MII_SET(x) \
CSR_WRITE_1(sc, RL_MII, \
CSR_READ_1(sc, RL_MII) | x)
#define MII_CLR(x) \
CSR_WRITE_1(sc, RL_MII, \
CSR_READ_1(sc, RL_MII) & ~x)
/*
* Sync the PHYs by setting data bit and strobing the clock 32 times.
*/
STATIC void rl_mii_sync(sc)
struct rl_softc *sc;
{
int i;
MII_SET(RL_MII_DIR|RL_MII_DATAOUT);
for (i = 0; i < 32; i++) {
MII_SET(RL_MII_CLK);
DELAY(1);
MII_CLR(RL_MII_CLK);
DELAY(1);
}
return;
}
/*
* Clock a series of bits through the MII.
*/
STATIC void rl_mii_send(sc, bits, cnt)
struct rl_softc *sc;
u_int32_t bits;
int cnt;
{
int i;
MII_CLR(RL_MII_CLK);
for (i = (0x1 << (cnt - 1)); i; i >>= 1) {
if (bits & i) {
MII_SET(RL_MII_DATAOUT);
} else {
MII_CLR(RL_MII_DATAOUT);
}
DELAY(1);
MII_CLR(RL_MII_CLK);
DELAY(1);
MII_SET(RL_MII_CLK);
}
}
/*
* Read an PHY register through the MII.
*/
STATIC int rl_mii_readreg(sc, frame)
struct rl_softc *sc;
struct rl_mii_frame *frame;
{
int i, ack, s;
s = splimp();
/*
* Set up frame for RX.
*/
frame->mii_stdelim = RL_MII_STARTDELIM;
frame->mii_opcode = RL_MII_READOP;
frame->mii_turnaround = 0;
frame->mii_data = 0;
CSR_WRITE_2(sc, RL_MII, 0);
/*
* Turn on data xmit.
*/
MII_SET(RL_MII_DIR);
rl_mii_sync(sc);
/*
* Send command/address info.
*/
rl_mii_send(sc, frame->mii_stdelim, 2);
rl_mii_send(sc, frame->mii_opcode, 2);
rl_mii_send(sc, frame->mii_phyaddr, 5);
rl_mii_send(sc, frame->mii_regaddr, 5);
/* Idle bit */
MII_CLR((RL_MII_CLK|RL_MII_DATAOUT));
DELAY(1);
MII_SET(RL_MII_CLK);
DELAY(1);
/* Turn off xmit. */
MII_CLR(RL_MII_DIR);
/* Check for ack */
MII_CLR(RL_MII_CLK);
DELAY(1);
MII_SET(RL_MII_CLK);
DELAY(1);
ack = CSR_READ_2(sc, RL_MII) & RL_MII_DATAIN;
/*
* Now try reading data bits. If the ack failed, we still
* need to clock through 16 cycles to keep the PHY(s) in sync.
*/
if (ack) {
for(i = 0; i < 16; i++) {
MII_CLR(RL_MII_CLK);
DELAY(1);
MII_SET(RL_MII_CLK);
DELAY(1);
}
goto fail;
}
for (i = 0x8000; i; i >>= 1) {
MII_CLR(RL_MII_CLK);
DELAY(1);
if (!ack) {
if (CSR_READ_2(sc, RL_MII) & RL_MII_DATAIN)
frame->mii_data |= i;
DELAY(1);
}
MII_SET(RL_MII_CLK);
DELAY(1);
}
fail:
MII_CLR(RL_MII_CLK);
DELAY(1);
MII_SET(RL_MII_CLK);
DELAY(1);
splx(s);
if (ack)
return(1);
return(0);
}
/*
* Write to a PHY register through the MII.
*/
STATIC int rl_mii_writereg(sc, frame)
struct rl_softc *sc;
struct rl_mii_frame *frame;
{
int s;
s = splimp();
/*
* Set up frame for TX.
*/
frame->mii_stdelim = RL_MII_STARTDELIM;
frame->mii_opcode = RL_MII_WRITEOP;
frame->mii_turnaround = RL_MII_TURNAROUND;
/*
* Turn on data output.
*/
MII_SET(RL_MII_DIR);
rl_mii_sync(sc);
rl_mii_send(sc, frame->mii_stdelim, 2);
rl_mii_send(sc, frame->mii_opcode, 2);
rl_mii_send(sc, frame->mii_phyaddr, 5);
rl_mii_send(sc, frame->mii_regaddr, 5);
rl_mii_send(sc, frame->mii_turnaround, 2);
rl_mii_send(sc, frame->mii_data, 16);
/* Idle bit. */
MII_SET(RL_MII_CLK);
DELAY(1);
MII_CLR(RL_MII_CLK);
DELAY(1);
/*
* Turn off xmit.
*/
MII_CLR(RL_MII_DIR);
splx(s);
return(0);
}
STATIC int rl_phy_readreg(self, phy, reg)
struct device *self;
int phy, reg;
{
struct rl_softc *sc = (void *)self;
struct rl_mii_frame frame;
u_int16_t rval = 0;
u_int16_t rl8139_reg = 0;
if (sc->rl_type == RL_8139) {
if (phy != 7)
return (0);
switch(reg) {
case MII_BMCR:
rl8139_reg = RL_BMCR;
break;
case MII_BMSR:
rl8139_reg = RL_BMSR;
break;
case MII_ANAR:
rl8139_reg = RL_ANAR;
break;
case MII_ANLPAR:
rl8139_reg = RL_LPAR;
break;
default:
#if 0
printf("%s: bad phy register\n", sc->sc_dev.dv_xname);
#endif
return(0);
}
rval = CSR_READ_2(sc, rl8139_reg);
return(rval);
}
bzero((char *)&frame, sizeof(frame));
frame.mii_phyaddr = phy;
frame.mii_regaddr = reg;
rl_mii_readreg(sc, &frame);
return(frame.mii_data);
}
STATIC void rl_phy_writereg(self, phy, reg, data)
struct device *self;
int phy, reg;
int data;
{
struct rl_softc *sc = (void *)self;
struct rl_mii_frame frame;
u_int16_t rl8139_reg = 0;
if (sc->rl_type == RL_8139) {
if (phy != 7)
return;
switch(reg) {
case MII_BMCR:
rl8139_reg = RL_BMCR;
break;
case MII_BMSR:
rl8139_reg = RL_BMSR;
break;
case MII_ANAR:
rl8139_reg = RL_ANAR;
break;
case MII_ANLPAR:
rl8139_reg = RL_LPAR;
break;
default:
#if 0
printf("%s: bad phy register\n", sc->sc_dev.dv_xname);
#endif
return;
}
CSR_WRITE_2(sc, rl8139_reg, data);
return;
}
bzero((char *)&frame, sizeof(frame));
frame.mii_phyaddr = phy;
frame.mii_regaddr = reg;
frame.mii_data = data;
rl_mii_writereg(sc, &frame);
return;
}
STATIC void
rl_phy_statchg(v)
struct device *v;
{
/* Nothing to do. */
}
/*
* Calculate CRC of a multicast group address, return the upper 6 bits.
*/
STATIC u_int8_t rl_calchash(addr)
caddr_t addr;
{
u_int32_t crc, carry;
int i, j;
u_int8_t c;
/* Compute CRC for the address value. */
crc = 0xFFFFFFFF; /* initial value */
for (i = 0; i < 6; i++) {
c = *(addr + i);
for (j = 0; j < 8; j++) {
carry = ((crc & 0x80000000) ? 1 : 0) ^ (c & 0x01);
crc <<= 1;
c >>= 1;
if (carry)
crc = (crc ^ 0x04c11db6) | carry;
}
}
/* return the filter bit position */
return(crc >> 26);
}
/*
* Program the 64-bit multicast hash filter.
*/
STATIC void rl_setmulti(sc)
struct rl_softc *sc;
{
struct ifnet *ifp;
int h = 0;
u_int32_t hashes[2] = { 0, 0 };
u_int32_t rxfilt;
int mcnt = 0;
struct ether_multi *enm;
struct ether_multistep step;
ifp = &sc->ethercom.ec_if;
rxfilt = CSR_READ_4(sc, RL_RXCFG);
if (ifp->if_flags & IFF_ALLMULTI || ifp->if_flags & IFF_PROMISC) {
rxfilt |= RL_RXCFG_RX_MULTI;
CSR_WRITE_4(sc, RL_RXCFG, rxfilt);
CSR_WRITE_4(sc, RL_MAR0, 0xFFFFFFFF);
CSR_WRITE_4(sc, RL_MAR4, 0xFFFFFFFF);
return;
}
/* first, zot all the existing hash bits */
CSR_WRITE_4(sc, RL_MAR0, 0);
CSR_WRITE_4(sc, RL_MAR4, 0);
/* now program new ones */
ETHER_FIRST_MULTI(step, &sc->ethercom, enm);
while (enm != NULL) {
h = rl_calchash(enm->enm_addrlo);
if (h < 32)
hashes[0] |= (1 << h);
else
hashes[1] |= (1 << (h - 32));
mcnt++;
ETHER_NEXT_MULTI(step, enm);
}
if (mcnt)
rxfilt |= RL_RXCFG_RX_MULTI;
else
rxfilt &= ~RL_RXCFG_RX_MULTI;
CSR_WRITE_4(sc, RL_RXCFG, rxfilt);
CSR_WRITE_4(sc, RL_MAR0, hashes[0]);
CSR_WRITE_4(sc, RL_MAR4, hashes[1]);
return;
}
void rl_reset(sc)
struct rl_softc *sc;
{
int i;
CSR_WRITE_1(sc, RL_COMMAND, RL_CMD_RESET);
for (i = 0; i < RL_TIMEOUT; i++) {
DELAY(10);
if (!(CSR_READ_1(sc, RL_COMMAND) & RL_CMD_RESET))
break;
}
if (i == RL_TIMEOUT)
printf("%s: reset never completed!\n", sc->sc_dev.dv_xname);
return;
}
/*
* Attach the interface. Allocate softc structures, do ifmedia
* setup and ethernet/BPF attach.
*/
void
rl_attach(sc, eaddr)
struct rl_softc *sc;
const u_int8_t *eaddr;
{
struct ifnet *ifp;
bus_dma_segment_t dmaseg;
int error,dmanseg;
int i;
callout_init(&sc->rl_tick_ch);
if ((error = bus_dmamem_alloc(sc->sc_dmat,
RL_RXBUFLEN + 32, NBPG, 0, &dmaseg, 1, &dmanseg,
BUS_DMA_NOWAIT)) != 0) {
printf("%s: can't allocate recv buffer, error = %d\n",
sc->sc_dev.dv_xname, error);
goto fail;
}
if ((error = bus_dmamem_map(sc->sc_dmat, &dmaseg, dmanseg,
RL_RXBUFLEN + 32, (caddr_t *)&sc->rl_cdata.rl_rx_buf,
BUS_DMA_NOWAIT|BUS_DMA_COHERENT)) != 0) {
printf("%s: can't map recv buffer, error = %d\n",
sc->sc_dev.dv_xname, error);
goto fail;
}
/* Leave a few bytes before the start of the RX ring buffer. */
sc->rl_cdata.rl_rx_buf_ptr = sc->rl_cdata.rl_rx_buf;
sc->rl_cdata.rl_rx_buf += sizeof(u_int64_t);
if ((error = bus_dmamap_create(sc->sc_dmat,
RL_RXBUFLEN + 32 - sizeof(u_int64_t), 1,
RL_RXBUFLEN + 32 - sizeof(u_int64_t), 0, BUS_DMA_NOWAIT,
&sc->recv_dmamap)) != 0) {
printf("%s: can't create recv buffer DMA map, error = %d\n",
sc->sc_dev.dv_xname, error);
goto fail;
}
if ((error = bus_dmamap_load(sc->sc_dmat, sc->recv_dmamap,
sc->rl_cdata.rl_rx_buf, RL_RXBUFLEN + 32 - sizeof(u_int64_t), NULL,
BUS_DMA_NOWAIT)) != 0) {
printf("%s: can't load recv buffer DMA map, error = %d\n",
sc->sc_dev.dv_xname, error);
goto fail;
}
for (i = 0; i < RL_TX_LIST_CNT; i++)
if (rl_allocsndbuf(sc, i))
goto fail;
ifp = &sc->ethercom.ec_if;
ifp->if_softc = sc;
bcopy(sc->sc_dev.dv_xname, ifp->if_xname, IFNAMSIZ);
ifp->if_mtu = ETHERMTU;
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_ioctl = rl_ioctl;
#if 0
ifp->if_output = ether_output;
#endif
ifp->if_start = rl_start;
ifp->if_watchdog = rl_watchdog;
ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
/*
* Do ifmedia setup.
*/
sc->mii.mii_ifp = ifp;
sc->mii.mii_readreg = rl_phy_readreg;
sc->mii.mii_writereg = rl_phy_writereg;
sc->mii.mii_statchg = rl_phy_statchg;
ifmedia_init(&sc->mii.mii_media, 0, rl_ifmedia_upd, rl_ifmedia_sts);
mii_attach(&sc->sc_dev, &sc->mii, 0xffffffff,
MII_PHY_ANY, MII_OFFSET_ANY, 0);
/* Choose a default media. */
if (LIST_FIRST(&sc->mii.mii_phys) == NULL) {
ifmedia_add(&sc->mii.mii_media, IFM_ETHER|IFM_NONE,
0, NULL);
ifmedia_set(&sc->mii.mii_media, IFM_ETHER|IFM_NONE);
} else {
ifmedia_set(&sc->mii.mii_media, IFM_ETHER|IFM_AUTO);
}
/*
* Call MI attach routines.
*/
if_attach(ifp);
ether_ifattach(ifp, eaddr);
#if NBPFILTER > 0
bpfattach(&sc->ethercom.ec_if.if_bpf, ifp, DLT_EN10MB,
sizeof(struct ether_header));
#endif
shutdownhook_establish(rl_shutdown, sc);
fail:
return;
}
/*
* Initialize the transmit descriptors.
*/
STATIC int rl_list_tx_init(sc)
struct rl_softc *sc;
{
struct rl_chain_data *cd;
int i;
cd = &sc->rl_cdata;
for (i = 0; i < RL_TX_LIST_CNT; i++) {
cd->rl_tx_chain[i] = NULL;
CSR_WRITE_4(sc,
RL_TXADDR0 + (i * sizeof(u_int32_t)), 0x0000000);
}
sc->rl_cdata.cur_tx = 0;
sc->rl_cdata.last_tx = 0;
return(0);
}
/*
* A frame has been uploaded: pass the resulting mbuf chain up to
* the higher level protocols.
*
* You know there's something wrong with a PCI bus-master chip design
* when you have to use m_devget().
*
* The receive operation is badly documented in the datasheet, so I'll
* attempt to document it here. The driver provides a buffer area and
* places its base address in the RX buffer start address register.
* The chip then begins copying frames into the RX buffer. Each frame
* is preceeded by a 32-bit RX status word which specifies the length
* of the frame and certain other status bits. Each frame (starting with
* the status word) is also 32-bit aligned. The frame length is in the
* first 16 bits of the status word; the lower 15 bits correspond with
* the 'rx status register' mentioned in the datasheet.
*
* Note: to make the Alpha happy, the frame payload needs to be aligned
* on a 32-bit boundary. To achieve this, we cheat a bit by copying from
* the ring buffer starting at an address two bytes before the actual
* data location. We can then shave off the first two bytes using m_adj().
* The reason we do this is because m_devget() doesn't let us specify an
* offset into the mbuf storage space, so we have to artificially create
* one. The ring is allocated in such a way that there are a few unused
* bytes of space preceecing it so that it will be safe for us to do the
* 2-byte backstep even if reading from the ring at offset 0.
*/
STATIC void rl_rxeof(sc)
struct rl_softc *sc;
{
struct ether_header *eh;
struct mbuf *m;
struct ifnet *ifp;
int total_len = 0;
u_int32_t rxstat;
caddr_t rxbufpos;
int wrap = 0;
u_int16_t cur_rx;
u_int16_t limit;
u_int16_t rx_bytes = 0, max_bytes;
ifp = &sc->ethercom.ec_if;
cur_rx = (CSR_READ_2(sc, RL_CURRXADDR) + 16) % RL_RXBUFLEN;
/* Do not try to read past this point. */
limit = CSR_READ_2(sc, RL_CURRXBUF) % RL_RXBUFLEN;
if (limit < cur_rx)
max_bytes = (RL_RXBUFLEN - cur_rx) + limit;
else
max_bytes = limit - cur_rx;
while((CSR_READ_1(sc, RL_COMMAND) & RL_CMD_EMPTY_RXBUF) == 0) {
rxbufpos = sc->rl_cdata.rl_rx_buf + cur_rx;
rxstat = *(u_int32_t *)rxbufpos;
/*
* Here's a totally undocumented fact for you. When the
* RealTek chip is in the process of copying a packet into
* RAM for you, the length will be 0xfff0. If you spot a
* packet header with this value, you need to stop. The
* datasheet makes absolutely no mention of this and
* RealTek should be shot for this.
*/
if ((u_int16_t)(rxstat >> 16) == RL_RXSTAT_UNFINISHED)
break;
if (!(rxstat & RL_RXSTAT_RXOK)) {
ifp->if_ierrors++;
/*
* submitted by:[netbsd-pcmcia:00484]
* Takahiro Kambe <taca@sky.yamashina.kyoto.jp>
* obtain from:
* FreeBSD if_rl.c rev 1.24->1.25
*
*/
#if 0
if (rxstat & (RL_RXSTAT_BADSYM|RL_RXSTAT_RUNT|
RL_RXSTAT_GIANT|RL_RXSTAT_CRCERR|
RL_RXSTAT_ALIGNERR)) {
if (rxstat & (RL_RXSTAT_BADSYM|RL_RXSTAT_RUNT|
RL_RXSTAT_GIANT|RL_RXSTAT_CRCERR|
RL_RXSTAT_ALIGNERR)) {
CSR_WRITE_2(sc, RL_COMMAND, RL_CMD_TX_ENB);
CSR_WRITE_2(sc, RL_COMMAND, RL_CMD_TX_ENB|
RL_CMD_RX_ENB);
CSR_WRITE_4(sc, RL_RXCFG, RL_RXCFG_CONFIG);
CSR_WRITE_4(sc, RL_RXADDR,
sc->recv_dmamap->dm_segs[0].ds_addr);
CSR_WRITE_2(sc, RL_CURRXADDR, cur_rx - 16);
cur_rx = 0;
}
break;
#else
rl_init(sc);
return;
#endif
}
/* No errors; receive the packet. */
total_len = rxstat >> 16;
rx_bytes += total_len + 4;
/*
* XXX The RealTek chip includes the CRC with every
* received frame, and there's no way to turn this
* behavior off (at least, I can't find anything in
* the manual that explains how to do it) so we have
* to trim off the CRC manually.
*/
total_len -= ETHER_CRC_LEN;
/*
* Avoid trying to read more bytes than we know
* the chip has prepared for us.
*/
if (rx_bytes > max_bytes)
break;
rxbufpos = sc->rl_cdata.rl_rx_buf +
((cur_rx + sizeof(u_int32_t)) % RL_RXBUFLEN);
if (rxbufpos == (sc->rl_cdata.rl_rx_buf + RL_RXBUFLEN))
rxbufpos = sc->rl_cdata.rl_rx_buf;
wrap = (sc->rl_cdata.rl_rx_buf + RL_RXBUFLEN) - rxbufpos;
if (total_len > wrap) {
m = m_devget(rxbufpos - RL_ETHER_ALIGN,
wrap + RL_ETHER_ALIGN, 0, ifp, NULL);
if (m == NULL) {
ifp->if_ierrors++;
printf("%s: out of mbufs, tried to "
"copy %d bytes\n", sc->sc_dev.dv_xname, wrap);
}
else {
m_adj(m, RL_ETHER_ALIGN);
m_copyback(m, wrap, total_len - wrap,
sc->rl_cdata.rl_rx_buf);
}
cur_rx = (total_len - wrap + ETHER_CRC_LEN);
} else {
m = m_devget(rxbufpos - RL_ETHER_ALIGN,
total_len + RL_ETHER_ALIGN, 0, ifp, NULL);
if (m == NULL) {
ifp->if_ierrors++;
printf("%s: out of mbufs, tried to "
"copy %d bytes\n", sc->sc_dev.dv_xname, total_len);
} else
m_adj(m, RL_ETHER_ALIGN);
cur_rx += total_len + 4 + ETHER_CRC_LEN;
}
/*
* Round up to 32-bit boundary.
*/
cur_rx = (cur_rx + 3) & ~3;
CSR_WRITE_2(sc, RL_CURRXADDR, cur_rx - 16);
if (m == NULL)
continue;
eh = mtod(m, struct ether_header *);
ifp->if_ipackets++;
#if NBPFILTER > 0
/*
* Handle BPF listeners. Let the BPF user see the packet, but
* don't pass it up to the ether_input() layer unless it's
* a broadcast packet, multicast packet, matches our ethernet
* address or the interface is in promiscuous mode.
*/
if (ifp->if_bpf) {
bpf_mtap(ifp->if_bpf, m);
if (ifp->if_flags & IFF_PROMISC &&
(bcmp(eh->ether_dhost, LLADDR(ifp->if_sadl),
ETHER_ADDR_LEN) &&
(eh->ether_dhost[0] & 1) == 0)) {
m_freem(m);
continue;
}
}
#endif
/* pass it on. */
(*ifp->if_input)(ifp, m);
}
return;
}
/*
* A frame was downloaded to the chip. It's safe for us to clean up
* the list buffers.
*/
STATIC void rl_txeof(sc)
struct rl_softc *sc;
{
struct ifnet *ifp;
u_int32_t txstat;
ifp = &sc->ethercom.ec_if;
/* Clear the timeout timer. */
ifp->if_timer = 0;
/*
* Go through our tx list and free mbufs for those
* frames that have been uploaded.
*/
do {
txstat = CSR_READ_4(sc, RL_LAST_TXSTAT(sc));
if (!(txstat & (RL_TXSTAT_TX_OK|
RL_TXSTAT_TX_UNDERRUN|RL_TXSTAT_TXABRT)))
break;
ifp->if_collisions += (txstat & RL_TXSTAT_COLLCNT) >> 24;
if (RL_LAST_TXMBUF(sc) != NULL) {
RL_LAST_TXMBUF(sc) = NULL;
}
if (txstat & RL_TXSTAT_TX_OK)
ifp->if_opackets++;
else {
ifp->if_oerrors++;
if ((txstat & RL_TXSTAT_TXABRT) ||
(txstat & RL_TXSTAT_OUTOFWIN))
CSR_WRITE_4(sc, RL_TXCFG, RL_TXCFG_CONFIG);
}
RL_INC(sc->rl_cdata.last_tx);
ifp->if_flags &= ~IFF_OACTIVE;
} while (sc->rl_cdata.last_tx != sc->rl_cdata.cur_tx);
return;
}
int rl_intr(arg)
void *arg;
{
struct rl_softc *sc;
struct ifnet *ifp;
u_int16_t status;
int handled = 0;
sc = arg;
ifp = &sc->ethercom.ec_if;
/* Disable interrupts. */
CSR_WRITE_2(sc, RL_IMR, 0x0000);
for (;;) {
status = CSR_READ_2(sc, RL_ISR);
if (status)
CSR_WRITE_2(sc, RL_ISR, status);
handled = 1;
if ((status & RL_INTRS) == 0)
break;
if (status & RL_ISR_RX_OK)
rl_rxeof(sc);
if (status & RL_ISR_RX_ERR)
rl_rxeof(sc);
if ((status & RL_ISR_TX_OK) || (status & RL_ISR_TX_ERR))
rl_txeof(sc);
if (status & RL_ISR_SYSTEM_ERR) {
rl_reset(sc);
rl_init(sc);
}
}
/* Re-enable interrupts. */
CSR_WRITE_2(sc, RL_IMR, RL_INTRS);
if (ifp->if_snd.ifq_head != NULL) {
rl_start(ifp);
}
return (handled);
}
STATIC int
rl_allocsndbuf(sc, idx)
struct rl_softc *sc;
int idx;
{
struct mbuf *m_new = NULL;
int error;
MGETHDR(m_new, M_DONTWAIT, MT_DATA);
if (m_new == NULL) {
printf("%s: no memory for tx list", sc->sc_dev.dv_xname);
return(1);
}
MCLGET(m_new, M_DONTWAIT);
if (!(m_new->m_flags & M_EXT)) {
m_freem(m_new);
printf("%s: no memory for tx list", sc->sc_dev.dv_xname);
return(1);
}
if ((error = bus_dmamap_create(sc->sc_dmat,
MCLBYTES, 1,
MCLBYTES, 0, BUS_DMA_NOWAIT,
&sc->snd_dmamap[idx])) != 0) {
printf("%s: can't create snd buffer DMA map, error = %d\n",
sc->sc_dev.dv_xname, error);
return (1);
}
if ((error = bus_dmamap_load(sc->sc_dmat, sc->snd_dmamap[idx],
mtod(m_new, caddr_t), MCLBYTES, NULL,
BUS_DMA_NOWAIT)) != 0) {
printf("%s: can't load snd buffer DMA map, error = %d\n",
sc->sc_dev.dv_xname, error);
return (1);
}
sc->sndbuf[idx] = m_new;
return (0);
}
/*
* Encapsulate an mbuf chain in a descriptor by coupling the mbuf data
* pointers to the fragment pointers.
*/
STATIC int rl_encap(sc, m_head)
struct rl_softc *sc;
struct mbuf *m_head;
{
struct mbuf *m_new;
/*
* The RealTek is brain damaged and wants longword-aligned
* TX buffers, plus we can only have one fragment buffer
* per packet. We have to copy pretty much all the time.
*/
m_new = sc->sndbuf[sc->rl_cdata.cur_tx];
m_copydata(m_head, 0, m_head->m_pkthdr.len,
mtod(m_new, caddr_t));
m_new->m_pkthdr.len = m_new->m_len = m_head->m_pkthdr.len;
m_freem(m_head);
m_head = m_new;
/* Pad frames to at least 60 bytes. */
if (m_head->m_pkthdr.len < RL_MIN_FRAMELEN) {
m_head->m_pkthdr.len +=
(RL_MIN_FRAMELEN - m_head->m_pkthdr.len);
m_head->m_len = m_head->m_pkthdr.len;
}
RL_CUR_TXMBUF(sc) = m_head;
return(0);
}
/*
* Main transmit routine.
*/
STATIC void rl_start(ifp)
struct ifnet *ifp;
{
struct rl_softc *sc;
struct mbuf *m_head = NULL;
sc = ifp->if_softc;
while(RL_CUR_TXMBUF(sc) == NULL) {
IF_DEQUEUE(&ifp->if_snd, m_head);
if (m_head == NULL)
break;
rl_encap(sc, m_head);
#if NBPFILTER > 0
/*
* If there's a BPF listener, bounce a copy of this frame
* to him.
*/
if (ifp->if_bpf)
bpf_mtap(ifp->if_bpf, RL_CUR_TXMBUF(sc));
#endif
/*
* Transmit the frame.
*/
CSR_WRITE_4(sc, RL_CUR_TXADDR(sc),
sc->snd_dmamap[sc->rl_cdata.cur_tx]->dm_segs[0].ds_addr);
CSR_WRITE_4(sc, RL_CUR_TXSTAT(sc),
RL_TX_EARLYTHRESH | RL_CUR_TXMBUF(sc)->m_pkthdr.len);
RL_INC(sc->rl_cdata.cur_tx);
}
/*
* We broke out of the loop because all our TX slots are
* full. Mark the NIC as busy until it drains some of the
* packets from the queue.
*/
if (RL_CUR_TXMBUF(sc) != NULL)
ifp->if_flags |= IFF_OACTIVE;
/*
* Set a timeout in case the chip goes out to lunch.
*/
ifp->if_timer = 5;
return;
}
STATIC void rl_init(xsc)
void *xsc;
{
struct rl_softc *sc = xsc;
struct ifnet *ifp = &sc->ethercom.ec_if;
int s, i;
u_int32_t rxcfg = 0;
u_int16_t phy_bmcr = 0;
s = splimp();
/*
* XXX Hack for the 8139: the built-in autoneg logic's state
* gets reset by rl_init() when we don't want it to. Try
* to preserve it.
*/
if (sc->rl_type == RL_8139)
phy_bmcr = rl_phy_readreg((struct device *)sc, 7, MII_BMCR);
/*
* Cancel pending I/O and free all RX/TX buffers.
*/
rl_stop(sc);
/* Init our MAC address */
for (i = 0; i < ETHER_ADDR_LEN; i++) {
CSR_WRITE_1(sc, RL_IDR0 + i, LLADDR(ifp->if_sadl)[i]);
}
/* Init the RX buffer pointer register. */
CSR_WRITE_4(sc, RL_RXADDR, sc->recv_dmamap->dm_segs[0].ds_addr);
/* Init TX descriptors. */
rl_list_tx_init(sc);
/*
* Enable transmit and receive.
*/
CSR_WRITE_1(sc, RL_COMMAND, RL_CMD_TX_ENB|RL_CMD_RX_ENB);
/*
* Set the initial TX and RX configuration.
*/
CSR_WRITE_4(sc, RL_TXCFG, RL_TXCFG_CONFIG);
CSR_WRITE_4(sc, RL_RXCFG, RL_RXCFG_CONFIG);
/* Set the individual bit to receive frames for this host only. */
rxcfg = CSR_READ_4(sc, RL_RXCFG);
rxcfg |= RL_RXCFG_RX_INDIV;
/* If we want promiscuous mode, set the allframes bit. */
if (ifp->if_flags & IFF_PROMISC) {
rxcfg |= RL_RXCFG_RX_ALLPHYS;
CSR_WRITE_4(sc, RL_RXCFG, rxcfg);
} else {
rxcfg &= ~RL_RXCFG_RX_ALLPHYS;
CSR_WRITE_4(sc, RL_RXCFG, rxcfg);
}
/*
* Set capture broadcast bit to capture broadcast frames.
*/
if (ifp->if_flags & IFF_BROADCAST) {
rxcfg |= RL_RXCFG_RX_BROAD;
CSR_WRITE_4(sc, RL_RXCFG, rxcfg);
} else {
rxcfg &= ~RL_RXCFG_RX_BROAD;
CSR_WRITE_4(sc, RL_RXCFG, rxcfg);
}
/*
* Program the multicast filter, if necessary.
*/
rl_setmulti(sc);
/*
* Enable interrupts.
*/
CSR_WRITE_2(sc, RL_IMR, RL_INTRS);
/* Start RX/TX process. */
CSR_WRITE_4(sc, RL_MISSEDPKT, 0);
/* Enable receiver and transmitter. */
CSR_WRITE_1(sc, RL_COMMAND, RL_CMD_TX_ENB|RL_CMD_RX_ENB);
/* Restore state of BMCR */
if (sc->rl_type == RL_8139)
rl_phy_writereg((struct device *)sc, 7, MII_BMCR, phy_bmcr);
CSR_WRITE_1(sc, RL_CFG1, RL_CFG1_DRVLOAD|RL_CFG1_FULLDUPLEX);
/*
* Set current media.
*/
mii_mediachg(&sc->mii);
ifp->if_flags |= IFF_RUNNING;
ifp->if_flags &= ~IFF_OACTIVE;
(void)splx(s);
callout_reset(&sc->rl_tick_ch, hz, rl_tick, sc);
}
/*
* Set media options.
*/
STATIC int rl_ifmedia_upd(ifp)
struct ifnet *ifp;
{
struct rl_softc *sc;
struct ifmedia *ifm;
sc = ifp->if_softc;
ifm = &sc->mii.mii_media;
if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER)
return(EINVAL);
return (mii_mediachg(&sc->mii));
}
/*
* Report current media status.
*/
STATIC void rl_ifmedia_sts(ifp, ifmr)
struct ifnet *ifp;
struct ifmediareq *ifmr;
{
struct rl_softc *sc;
sc = ifp->if_softc;
mii_pollstat(&sc->mii);
ifmr->ifm_status = sc->mii.mii_media_status;
ifmr->ifm_active = sc->mii.mii_media_active;
}
STATIC int
rl_ether_ioctl(ifp, cmd, data)
struct ifnet *ifp;
u_long cmd;
caddr_t data;
{
struct ifaddr *ifa = (struct ifaddr *) data;
struct rl_softc *sc = ifp->if_softc;
switch (cmd) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
switch (ifa->ifa_addr->sa_family) {
#ifdef INET
case AF_INET:
rl_init(sc);
arp_ifinit(ifp, ifa);
break;
#endif
#ifdef NS
case AF_NS:
{
struct ns_addr *ina = &IA_SNS(ifa)->sns_addr;
if (ns_nullhost(*ina))
ina->x_host = *(union ns_host *)
LLADDR(ifp->if_sadl);
else
bcopy(ina->x_host.c_host, LLADDR(ifp->if_sadl),
ifp->if_addrlen);
/* Set new address. */
rl_init(sc);
break;
}
#endif
default:
rl_init(sc);
break;
}
break;
default:
return (EINVAL);
}
return (0);
}
STATIC int rl_ioctl(ifp, command, data)
struct ifnet *ifp;
u_long command;
caddr_t data;
{
struct rl_softc *sc = ifp->if_softc;
struct ifreq *ifr = (struct ifreq *) data;
int s, error = 0;
s = splimp();
switch(command) {
case SIOCSIFADDR:
case SIOCGIFADDR:
case SIOCSIFMTU:
error = rl_ether_ioctl(ifp, command, data);
break;
case SIOCSIFFLAGS:
if (ifp->if_flags & IFF_UP) {
rl_init(sc);
} else {
if (ifp->if_flags & IFF_RUNNING)
rl_stop(sc);
}
error = 0;
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
rl_setmulti(sc);
error = 0;
break;
case SIOCGIFMEDIA:
case SIOCSIFMEDIA:
error = ifmedia_ioctl(ifp, ifr, &sc->mii.mii_media, command);
break;
default:
error = EINVAL;
break;
}
(void)splx(s);
return(error);
}
STATIC void rl_watchdog(ifp)
struct ifnet *ifp;
{
struct rl_softc *sc;
sc = ifp->if_softc;
printf("%s: watchdog timeout\n", sc->sc_dev.dv_xname);
ifp->if_oerrors++;
rl_txeof(sc);
rl_rxeof(sc);
rl_init(sc);
return;
}
/*
* Stop the adapter and free any mbufs allocated to the
* RX and TX lists.
*/
STATIC void rl_stop(sc)
struct rl_softc *sc;
{
int i;
struct ifnet *ifp;
ifp = &sc->ethercom.ec_if;
ifp->if_timer = 0;
callout_stop(&sc->rl_tick_ch);
mii_down(&sc->mii);
CSR_WRITE_1(sc, RL_COMMAND, 0x00);
CSR_WRITE_2(sc, RL_IMR, 0x0000);
/*
* Free the TX list buffers.
*/
for (i = 0; i < RL_TX_LIST_CNT; i++) {
if (sc->rl_cdata.rl_tx_chain[i] != NULL) {
m_freem(sc->rl_cdata.rl_tx_chain[i]);
sc->rl_cdata.rl_tx_chain[i] = NULL;
CSR_WRITE_4(sc, RL_TXADDR0 + i, 0x0000000);
}
}
ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
return;
}
/*
* Stop all chip I/O so that the kernel's probe routines don't
* get confused by errant DMAs when rebooting.
*/
STATIC void rl_shutdown(vsc)
void *vsc;
{
struct rl_softc *sc = (struct rl_softc *)vsc;
rl_stop(sc);
return;
}
STATIC void
rl_tick(arg)
void *arg;
{
struct rl_softc *sc = arg;
int s = splnet();
mii_tick(&sc->mii);
splx(s);
callout_reset(&sc->rl_tick_ch, hz, rl_tick, sc);
}
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