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freebsd-dev/sys/dev/xe/if_xe.c
Poul-Henning Kamp 85dc30cf82 Remove unused variable(s). 
Put XXX comment where intent is unclear.

Found by:       FlexeLint
2003-05-31 20:27:42 +00:00

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/*-
* Copyright (c) 1998, 1999 Scott Mitchell
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $Id: if_xe.c,v 1.20 1999/06/13 19:17:40 scott Exp $
* $FreeBSD$
*/
/*
* XXX TODO XXX
*
* I've pushed this fairly far, but there are some things that need to be
* done here. I'm documenting them here in case I get destracted. -- imp
*
* xe_cem56fix -- need to figure out how to map the extra stuff.
*/
/*
* Portions of this software were derived from Werner Koch's xirc2ps driver
* for Linux under the terms of the following license (from v1.30 of the
* xirc2ps driver):
*
* Copyright (c) 1997 by Werner Koch (dd9jn)
*
* 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, and the entire permission notice in its entirety,
* including the disclaimer of warranties.
* 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. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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 device driver for Xircom CreditCard PCMCIA Ethernet adapters. The
* following cards are currently known to work with the driver:
* Xircom CreditCard 10/100 (CE3)
* Xircom CreditCard Ethernet + Modem 28 (CEM28)
* Xircom CreditCard Ethernet 10/100 + Modem 56 (CEM56)
* Xircom RealPort Ethernet 10
* Xircom RealPort Ethernet 10/100
* Xircom RealPort Ethernet 10/100 + Modem 56 (REM56, REM56G)
* Intel EtherExpress Pro/100 PC Card Mobile Adapter 16 (Pro/100 M16A)
* Compaq Netelligent 10/100 PC Card (CPQ-10/100)
*
* Some other cards *should* work, but support for them is either broken or in
* an unknown state at the moment. I'm always interested in hearing from
* people who own any of these cards:
* Xircom CreditCard 10Base-T (PS-CE2-10)
* Xircom CreditCard Ethernet + ModemII (CEM2)
* Xircom CEM28 and CEM33 Ethernet/Modem cards (may be variants of CEM2?)
*
* Thanks to all who assisted with the development and testing of the driver,
* especially: Werner Koch, Duke Kamstra, Duncan Barclay, Jason George, Dru
* Nelson, Mike Kephart, Bill Rainey and Douglas Rand. Apologies if I've left
* out anyone who deserves a mention here.
*
* Special thanks to Ade Lovett for both hosting the mailing list and doing
* the CEM56/REM56 support code; and the FreeBSD UK Users' Group for hosting
* the web pages.
*
* Contact points:
*
* Driver web page: http://ukug.uk.freebsd.org/~scott/xe_drv/
*
* Mailing list: http://www.lovett.com/lists/freebsd-xircom/
* or send "subscribe freebsd-xircom" to <majordomo@lovett.com>
*
* Author email: <scott@uk.freebsd.org>
*/
#include <sys/param.h>
#include <sys/cdefs.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_mib.h>
#include <net/bpf.h>
#include <dev/xe/if_xereg.h>
#include <dev/xe/if_xevar.h>
/*
* MII command structure
*/
struct xe_mii_frame {
u_int8_t mii_stdelim;
u_int8_t mii_opcode;
u_int8_t mii_phyaddr;
u_int8_t mii_regaddr;
u_int8_t mii_turnaround;
u_int16_t mii_data;
};
/*
* Media autonegotiation progress constants
*/
#define XE_AUTONEG_NONE 0 /* No autonegotiation in progress */
#define XE_AUTONEG_WAITING 1 /* Waiting for transmitter to go idle */
#define XE_AUTONEG_STARTED 2 /* Waiting for autonegotiation to complete */
#define XE_AUTONEG_100TX 3 /* Trying to force 100baseTX link */
#define XE_AUTONEG_FAIL 4 /* Autonegotiation failed */
/*
* Prototypes start here
*/
static void xe_init (void *xscp);
static void xe_start (struct ifnet *ifp);
static int xe_ioctl (struct ifnet *ifp, u_long command, caddr_t data);
static void xe_watchdog (struct ifnet *ifp);
static int xe_media_change (struct ifnet *ifp);
static void xe_media_status (struct ifnet *ifp, struct ifmediareq *mrp);
static timeout_t xe_setmedia;
static void xe_hard_reset (struct xe_softc *scp);
static void xe_soft_reset (struct xe_softc *scp);
static void xe_stop (struct xe_softc *scp);
static void xe_enable_intr (struct xe_softc *scp);
static void xe_disable_intr (struct xe_softc *scp);
static void xe_setmulti (struct xe_softc *scp);
static void xe_setaddrs (struct xe_softc *scp);
static int xe_pio_write_packet (struct xe_softc *scp, struct mbuf *mbp);
static u_int32_t xe_compute_crc (u_int8_t *data, int len) __unused;
static int xe_compute_hashbit (u_int32_t crc) __unused;
/*
* MII functions
*/
static void xe_mii_sync (struct xe_softc *scp);
static int xe_mii_init (struct xe_softc *scp);
static void xe_mii_send (struct xe_softc *scp, u_int32_t bits, int cnt);
static int xe_mii_readreg (struct xe_softc *scp, struct xe_mii_frame *frame);
static int xe_mii_writereg (struct xe_softc *scp, struct xe_mii_frame *frame);
static u_int16_t xe_phy_readreg (struct xe_softc *scp, u_int16_t reg);
static void xe_phy_writereg (struct xe_softc *scp, u_int16_t reg, u_int16_t data);
/*
* Debug functions -- uncomment for VERY verbose dignostic information.
* Set to 1 for less verbose information
*/
/* #define XE_DEBUG 2 */
#ifdef XE_DEBUG
#define XE_REG_DUMP(scp) xe_reg_dump((scp))
#define XE_MII_DUMP(scp) xe_mii_dump((scp))
static void xe_reg_dump (struct xe_softc *scp);
static void xe_mii_dump (struct xe_softc *scp);
#else
#define XE_REG_DUMP(scp)
#define XE_MII_DUMP(scp)
#endif
/*
* Attach a device.
*/
int
xe_attach (device_t dev)
{
struct xe_softc *scp = device_get_softc(dev);
#ifdef XE_DEBUG
device_printf(dev, "attach\n");
#endif
/* Fill in some private data */
scp->ifp = &scp->arpcom.ac_if;
scp->ifm = &scp->ifmedia;
scp->autoneg_status = 0;
/* Hopefully safe to read this here */
XE_SELECT_PAGE(4);
scp->version = XE_INB(XE_BOV);
scp->dev = dev;
/* Initialise the ifnet structure */
if (!scp->ifp->if_name) {
scp->ifp->if_softc = scp;
scp->ifp->if_name = "xe";
scp->ifp->if_unit = device_get_unit(dev);
scp->ifp->if_timer = 0;
scp->ifp->if_flags = (IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST);
scp->ifp->if_linkmib = &scp->mibdata;
scp->ifp->if_linkmiblen = sizeof scp->mibdata;
scp->ifp->if_output = ether_output;
scp->ifp->if_start = xe_start;
scp->ifp->if_ioctl = xe_ioctl;
scp->ifp->if_watchdog = xe_watchdog;
scp->ifp->if_init = xe_init;
scp->ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
}
/* Initialise the ifmedia structure */
ifmedia_init(scp->ifm, 0, xe_media_change, xe_media_status);
callout_handle_init(&scp->chand);
/*
* Fill in supported media types. Some cards _do_ support full duplex
* operation, but this driver doesn't, yet. Therefore we leave those modes
* out of the list. We support some form of autoselection in all cases.
*/
if (scp->mohawk) {
ifmedia_add(scp->ifm, IFM_ETHER|IFM_100_TX, 0, NULL);
ifmedia_add(scp->ifm, IFM_ETHER|IFM_10_T, 0, NULL);
}
else {
ifmedia_add(scp->ifm, IFM_ETHER|IFM_10_T, 0, NULL);
ifmedia_add(scp->ifm, IFM_ETHER|IFM_10_2, 0, NULL);
}
ifmedia_add(scp->ifm, IFM_ETHER|IFM_AUTO, 0, NULL);
/* Default is to autoselect best supported media type */
ifmedia_set(scp->ifm, IFM_ETHER|IFM_AUTO);
/* Print some useful information */
device_printf(dev, "%s %s, bonding version %#x%s%s\n",
scp->vendor,
scp->card_type,
scp->version,
scp->mohawk ? ", 100Mbps capable" : "",
scp->modem ? ", with modem" : "");
if (scp->mohawk) {
XE_SELECT_PAGE(0x10);
device_printf(dev, "DingoID = %#x, RevisionID = %#x, VendorID = %#x\n",
XE_INW(XE_DINGOID),
XE_INW(XE_RevID),
XE_INW(XE_VendorID));
}
if (scp->ce2) {
XE_SELECT_PAGE(0x45);
device_printf(dev, "CE2 version = %#x\n", XE_INB(XE_REV));
}
/* Print MAC address */
device_printf(dev, "Ethernet address %6D\n", scp->arpcom.ac_enaddr, ":");
/* Attach the interface */
ether_ifattach(scp->ifp, scp->arpcom.ac_enaddr);
/* Done */
return 0;
}
/*
* Initialize device. Completes the reset procedure on the card and starts
* output. If there's an autonegotiation in progress we DON'T do anything;
* the media selection code will call us again when it's done.
*/
static void
xe_init(void *xscp) {
struct xe_softc *scp = xscp;
int s;
#ifdef XE_DEBUG
device_printf(scp->dev, "init\n");
#endif
if (TAILQ_EMPTY(&scp->ifp->if_addrhead)) return;
/* Reset transmitter flags */
scp->tx_queued = 0;
scp->tx_tpr = 0;
scp->tx_collisions = 0;
scp->ifp->if_timer = 0;
s = splimp();
XE_SELECT_PAGE(0x42);
XE_OUTB(XE_SWC0, 0x20); /* Disable source insertion (WTF is that?) */
/*
* Set the 'local memory dividing line' -- splits the 32K card memory into
* 8K for transmit buffers and 24K for receive. This is done automatically
* on newer revision cards.
*/
if (scp->srev != 1) {
XE_SELECT_PAGE(2);
XE_OUTW(XE_RBS, 0x2000);
}
/* Set up multicast addresses */
xe_setmulti(scp);
/* Fix the data offset register -- reset leaves it off-by-one */
XE_SELECT_PAGE(0);
XE_OUTW(XE_DO, 0x2000);
/*
* Set MAC interrupt masks and clear status regs. The bit names are direct
* from the Linux code; I have no idea what most of them do.
*/
XE_SELECT_PAGE(0x40); /* Bit 7..0 */
XE_OUTB(XE_RX0Msk, 0xff); /* ROK, RAB, rsv, RO, CRC, AE, PTL, MP */
XE_OUTB(XE_TX0Msk, 0xff); /* TOK, TAB, SQE, LL, TU, JAB, EXC, CRS */
XE_OUTB(XE_TX0Msk+1, 0xb0); /* rsv, rsv, PTD, EXT, rsv, rsv, rsv, rsv */
XE_OUTB(XE_RST0, 0x00); /* ROK, RAB, REN, RO, CRC, AE, PTL, MP */
XE_OUTB(XE_TXST0, 0x00); /* TOK, TAB, SQE, LL, TU, JAB, EXC, CRS */
XE_OUTB(XE_TXST1, 0x00); /* TEN, rsv, PTD, EXT, retry_counter:4 */
/*
* Check for an in-progress autonegotiation. If one is active, just set
* IFF_RUNNING and return. The media selection code will call us again when
* it's done.
*/
if (scp->autoneg_status) {
scp->ifp->if_flags |= IFF_RUNNING;
}
else {
/* Enable receiver, put MAC online */
XE_SELECT_PAGE(0x40);
XE_OUTB(XE_CMD0, XE_CMD0_RX_ENABLE|XE_CMD0_ONLINE);
/* Set up IMR, enable interrupts */
xe_enable_intr(scp);
/* Attempt to start output */
scp->ifp->if_flags |= IFF_RUNNING;
scp->ifp->if_flags &= ~IFF_OACTIVE;
xe_start(scp->ifp);
}
(void)splx(s);
}
/*
* Start output on interface. We make two assumptions here:
* 1) that the current priority is set to splimp _before_ this code
* is called *and* is returned to the appropriate priority after
* return
* 2) that the IFF_OACTIVE flag is checked before this code is called
* (i.e. that the output part of the interface is idle)
*/
static void
xe_start(struct ifnet *ifp) {
struct xe_softc *scp = ifp->if_softc;
struct mbuf *mbp;
/*
* Loop while there are packets to be sent, and space to send them.
*/
while (1) {
IF_DEQUEUE(&ifp->if_snd, mbp); /* Suck a packet off the send queue */
if (mbp == NULL) {
/*
* We are using the !OACTIVE flag to indicate to the outside world that
* we can accept an additional packet rather than that the transmitter
* is _actually_ active. Indeed, the transmitter may be active, but if
* we haven't filled all the buffers with data then we still want to
* accept more.
*/
ifp->if_flags &= ~IFF_OACTIVE;
return;
}
if (xe_pio_write_packet(scp, mbp) != 0) {
IF_PREPEND(&ifp->if_snd, mbp); /* Push the packet back onto the queue */
ifp->if_flags |= IFF_OACTIVE;
return;
}
/* Tap off here if there is a bpf listener */
BPF_MTAP(ifp, mbp);
ifp->if_timer = 5; /* In case we don't hear from the card again */
scp->tx_queued++;
m_freem(mbp);
}
}
/*
* Process an ioctl request. Adapted from the ed driver.
*/
static int
xe_ioctl (register struct ifnet *ifp, u_long command, caddr_t data) {
struct xe_softc *scp;
int s, error;
scp = ifp->if_softc;
error = 0;
s = splimp();
switch (command) {
case SIOCSIFFLAGS:
/*
* If the interface is marked up and stopped, then start it. If it is
* marked down and running, then stop it.
*/
if (ifp->if_flags & IFF_UP) {
if (!(ifp->if_flags & IFF_RUNNING)) {
xe_hard_reset(scp);
xe_setmedia(scp);
xe_init(scp);
}
}
else {
if (ifp->if_flags & IFF_RUNNING)
xe_stop(scp);
}
/* XXX: intentional fall-through ? */
case SIOCADDMULTI:
case SIOCDELMULTI:
/*
* Multicast list has (maybe) changed; set the hardware filter
* accordingly. This also serves to deal with promiscuous mode if we have
* a BPF listener active.
*/
xe_setmulti(scp);
error = 0;
break;
case SIOCSIFMEDIA:
case SIOCGIFMEDIA:
/*
* Someone wants to get/set media options.
*/
error = ifmedia_ioctl(ifp, (struct ifreq *)data, &scp->ifmedia, command);
break;
default:
error = ether_ioctl(ifp, command, data);
}
(void)splx(s);
return error;
}
/*
* Card interrupt handler.
*
* This function is probably more complicated than it needs to be, as it
* attempts to deal with the case where multiple packets get sent between
* interrupts. This is especially annoying when working out the collision
* stats. Not sure whether this case ever really happens or not (maybe on a
* slow/heavily loaded machine?) so it's probably best to leave this like it
* is.
*
* Note that the crappy PIO used to get packets on and off the card means that
* you will spend a lot of time in this routine -- I can get my P150 to spend
* 90% of its time servicing interrupts if I really hammer the network. Could
* fix this, but then you'd start dropping/losing packets. The moral of this
* story? If you want good network performance _and_ some cycles left over to
* get your work done, don't buy a Xircom card. Or convince them to tell me
* how to do memory-mapped I/O :)
*/
static void
xe_intr(void *xscp)
{
struct xe_softc *scp = (struct xe_softc *) xscp;
struct ifnet *ifp;
u_int16_t rx_bytes, rxs, txs;
u_int8_t psr, isr, esr, rsr;
ifp = &scp->arpcom.ac_if;
rx_bytes = 0; /* Bytes received on this interrupt */
if (scp->mohawk) {
XE_OUTB(XE_CR, 0); /* Disable interrupts */
}
psr = XE_INB(XE_PR); /* Stash the current register page */
/*
* Read ISR to see what caused this interrupt. Note that this clears the
* ISR on CE2 type cards.
*/
if ((isr = XE_INB(XE_ISR)) && isr != 0xff) {
esr = XE_INB(XE_ESR); /* Read the other status registers */
XE_SELECT_PAGE(0x40);
rxs = XE_INB(XE_RST0);
XE_OUTB(XE_RST0, ~rxs & 0xff);
txs = XE_INB(XE_TXST0);
txs |= XE_INB(XE_TXST1) << 8;
XE_OUTB(XE_TXST0, 0);
XE_OUTB(XE_TXST1, 0);
XE_SELECT_PAGE(0);
#if XE_DEBUG > 2
printf("xe%d: ISR=%#2.2x ESR=%#2.2x RST=%#2.2x TXST=%#4.4x\n", unit, isr, esr, rxs, txs);
#endif
/*
* Handle transmit interrupts
*/
if (isr & XE_ISR_TX_PACKET) {
u_int8_t new_tpr, sent;
if ((new_tpr = XE_INB(XE_TPR)) < scp->tx_tpr) /* Update packet count */
sent = (0xff - scp->tx_tpr) + new_tpr; /* TPR rolled over */
else
sent = new_tpr - scp->tx_tpr;
if (sent > 0) { /* Packets sent since last interrupt */
scp->tx_tpr = new_tpr;
scp->tx_queued -= sent;
ifp->if_opackets += sent;
ifp->if_collisions += scp->tx_collisions;
/*
* Collision stats are a PITA. If multiples frames have been sent, we
* distribute any outstanding collision count equally amongst them.
* However, if we're missing interrupts we're quite likely to also
* miss some collisions; thus the total count will be off anyway.
* Likewise, if we miss a frame dropped due to excessive collisions
* any outstanding collisions count will be held against the next
* frame to be successfully sent. Hopefully it averages out in the
* end!
* XXX - This will screw up if tx_collisions/sent > 14. FIX IT!
*/
switch (scp->tx_collisions) {
case 0:
break;
case 1:
scp->mibdata.dot3StatsSingleCollisionFrames++;
scp->mibdata.dot3StatsCollFrequencies[0]++;
break;
default:
if (sent == 1) {
scp->mibdata.dot3StatsMultipleCollisionFrames++;
scp->mibdata.dot3StatsCollFrequencies[scp->tx_collisions-1]++;
}
else { /* Distribute across multiple frames */
scp->mibdata.dot3StatsMultipleCollisionFrames += sent;
scp->mibdata.
dot3StatsCollFrequencies[scp->tx_collisions/sent] += sent - scp->tx_collisions%sent;
scp->mibdata.
dot3StatsCollFrequencies[scp->tx_collisions/sent + 1] += scp->tx_collisions%sent;
}
}
scp->tx_collisions = 0;
}
ifp->if_timer = 0;
ifp->if_flags &= ~IFF_OACTIVE;
}
if (txs & 0x0002) { /* Excessive collisions (packet dropped) */
ifp->if_collisions += 16;
ifp->if_oerrors++;
scp->tx_collisions = 0;
scp->mibdata.dot3StatsExcessiveCollisions++;
scp->mibdata.dot3StatsMultipleCollisionFrames++;
scp->mibdata.dot3StatsCollFrequencies[15]++;
XE_OUTB(XE_CR, XE_CR_RESTART_TX);
}
if (txs & 0x0040) /* Transmit aborted -- probably collisions */
scp->tx_collisions++;
/*
* Handle receive interrupts
*/
while ((esr = XE_INB(XE_ESR)) & XE_ESR_FULL_PACKET_RX) {
if ((rsr = XE_INB(XE_RSR)) & XE_RSR_RX_OK) {
struct ether_header *ehp;
struct mbuf *mbp;
u_int16_t len;
len = XE_INW(XE_RBC);
if (len == 0)
continue;
#if 0
/*
* Limit the amount of time we spend in this loop, dropping packets if
* necessary. The Linux code does this with considerably more
* finesse, adjusting the threshold dynamically.
*/
if ((rx_bytes += len) > 22000) {
ifp->if_iqdrops++;
scp->mibData.dot3StatsMissedFrames++;
XE_OUTW(XE_DO, 0x8000);
continue;
}
#endif
if (len & 0x01)
len++;
MGETHDR(mbp, M_DONTWAIT, MT_DATA); /* Allocate a header mbuf */
if (mbp != NULL) {
mbp->m_pkthdr.rcvif = ifp;
mbp->m_pkthdr.len = mbp->m_len = len;
/*
* If the mbuf header isn't big enough for the packet, attach an
* mbuf cluster to hold it. The +2 is to allow for the nasty little
* alignment hack below.
*/
if (len + 2 > MHLEN) {
MCLGET(mbp, M_DONTWAIT);
if ((mbp->m_flags & M_EXT) == 0) {
m_freem(mbp);
mbp = NULL;
}
}
}
if (mbp != NULL) {
/*
* The Ethernet header is 14 bytes long; thus the actual packet data
* won't be 32-bit aligned when it's dumped into the mbuf. We
* offset everything by 2 bytes to fix this. Apparently the
* alignment is important for NFS, damn its eyes.
*/
mbp->m_data += 2;
ehp = mtod(mbp, struct ether_header *);
/*
* Now get the packet, including the Ethernet header and trailer (?)
* We use programmed I/O, because we don't know how to do shared
* memory with these cards. So yes, it's real slow, and heavy on
* the interrupts (CPU on my P150 maxed out at ~950KBps incoming).
*/
if (scp->srev == 0) { /* Workaround a bug in old cards */
u_short rhs;
XE_SELECT_PAGE(5);
rhs = XE_INW(XE_RHSA);
XE_SELECT_PAGE(0);
rhs += 3; /* Skip control info */
if (rhs >= 0x8000)
rhs = 0;
if (rhs + len > 0x8000) {
int i;
/*
* XXX - This i-- seems very wrong, but it's what the Linux guys
* XXX - do. Need someone with an old CE2 to test this for me.
* XXX - 99/3/28: Changed the first i-- to an i++, maybe that'll
* XXX - fix it? It seems as though the previous version would
* XXX - have caused an infinite loop (what, another one?).
*/
for (i = 0; i < len; i++, rhs++) {
((char *)ehp)[i] = XE_INB(XE_EDP);
if (rhs == 0x8000) {
rhs = 0;
i--;
}
}
}
else
bus_space_read_multi_2(scp->bst, scp->bsh, XE_EDP,
(u_int16_t *) ehp, len >> 1);
}
else
bus_space_read_multi_2(scp->bst, scp->bsh, XE_EDP,
(u_int16_t *) ehp, len >> 1);
/* Deliver packet to upper layers */
if (mbp != NULL) {
mbp->m_flags |= M_HASFCS; /* FCS is included in our
* packet */
mbp->m_pkthdr.len = mbp->m_len = len;
(*ifp->if_input)(ifp, mbp); /* Send the packet on its way */
ifp->if_ipackets++; /* Success! */
}
XE_OUTW(XE_DO, 0x8000); /* skip_rx_packet command */
}
}
else if (rsr & XE_RSR_LONG_PACKET) { /* Packet length >1518 bytes */
scp->mibdata.dot3StatsFrameTooLongs++;
ifp->if_ierrors++;
}
else if (rsr & XE_RSR_CRC_ERROR) { /* Bad checksum on packet */
scp->mibdata.dot3StatsFCSErrors++;
ifp->if_ierrors++;
}
else if (rsr & XE_RSR_ALIGN_ERROR) { /* Packet alignment error */
scp->mibdata.dot3StatsAlignmentErrors++;
ifp->if_ierrors++;
}
}
if (rxs & 0x10) { /* Receiver overrun */
scp->mibdata.dot3StatsInternalMacReceiveErrors++;
ifp->if_ierrors++;
XE_OUTB(XE_CR, XE_CR_CLEAR_OVERRUN);
}
}
XE_SELECT_PAGE(psr); /* Restore saved page */
XE_OUTB(XE_CR, XE_CR_ENABLE_INTR); /* Re-enable interrupts */
/* Could force an int here, instead of dropping packets? */
/* XE_OUTB(XE_CR, XE_CR_ENABLE_INTR|XE_CE_FORCE_INTR); */
return;
}
/*
* Device timeout/watchdog routine. Called automatically if we queue a packet
* for transmission but don't get an interrupt within a specified timeout
* (usually 5 seconds). When this happens we assume the worst and reset the
* card.
*/
static void
xe_watchdog(struct ifnet *ifp) {
struct xe_softc *scp = ifp->if_softc;
device_printf(scp->dev, "watchdog timeout; resetting card\n");
scp->tx_timeouts++;
ifp->if_oerrors += scp->tx_queued;
xe_stop(scp);
xe_hard_reset(scp);
xe_setmedia(scp);
xe_init(scp);
}
/*
* Change media selection.
*/
static int
xe_media_change(struct ifnet *ifp) {
struct xe_softc *scp = ifp->if_softc;
#ifdef XE_DEBUG
if_printf(ifp, "media_change\n");
#endif
if (IFM_TYPE(scp->ifm->ifm_media) != IFM_ETHER)
return(EINVAL);
/*
* Some card/media combos aren't always possible -- filter those out here.
*/
if ((IFM_SUBTYPE(scp->ifm->ifm_media) == IFM_AUTO ||
IFM_SUBTYPE(scp->ifm->ifm_media) == IFM_100_TX) && !scp->phy_ok)
return (EINVAL);
xe_setmedia(scp);
return 0;
}
/*
* Return current media selection.
*/
static void
xe_media_status(struct ifnet *ifp, struct ifmediareq *mrp) {
#ifdef XE_DEBUG
if_printf(ifp, "media_status\n");
#endif
mrp->ifm_active = ((struct xe_softc *)ifp->if_softc)->media;
return;
}
/*
* Select active media.
*/
static void xe_setmedia(void *xscp) {
struct xe_softc *scp = xscp;
u_int16_t bmcr, bmsr, anar, lpar;
#ifdef XE_DEBUG
device_printf(scp->dev, "setmedia\n");
#endif
/* Cancel any pending timeout */
untimeout(xe_setmedia, scp, scp->chand);
xe_disable_intr(scp);
/* Select media */
scp->media = IFM_ETHER;
switch (IFM_SUBTYPE(scp->ifm->ifm_media)) {
case IFM_AUTO: /* Autoselect media */
scp->media = IFM_ETHER|IFM_AUTO;
/*
* Autoselection is really awful. It goes something like this:
*
* Wait until the transmitter goes idle (2sec timeout).
* Reset card
* IF a 100Mbit PHY exists
* Start NWAY autonegotiation (3.5sec timeout)
* IF that succeeds
* Select 100baseTX or 10baseT, whichever was detected
* ELSE
* Reset card
* IF a 100Mbit PHY exists
* Try to force a 100baseTX link (3sec timeout)
* IF that succeeds
* Select 100baseTX
* ELSE
* Disable the PHY
* ENDIF
* ENDIF
* ENDIF
* ENDIF
* IF nothing selected so far
* IF a 100Mbit PHY exists
* Select 10baseT
* ELSE
* Select 10baseT or 10base2, whichever is connected
* ENDIF
* ENDIF
*/
switch (scp->autoneg_status) {
case XE_AUTONEG_NONE:
#if XE_DEBUG > 1
device_printf(scp->dev, "Waiting for idle transmitter\n");
#endif
scp->arpcom.ac_if.if_flags |= IFF_OACTIVE;
scp->autoneg_status = XE_AUTONEG_WAITING;
scp->chand = timeout(xe_setmedia, scp, hz * 2);
return;
case XE_AUTONEG_WAITING:
xe_soft_reset(scp);
if (scp->phy_ok) {
#if XE_DEBUG > 1
device_printf(scp->dev, "Starting autonegotiation\n");
#endif
bmcr = xe_phy_readreg(scp, PHY_BMCR);
bmcr &= ~(PHY_BMCR_AUTONEGENBL);
xe_phy_writereg(scp, PHY_BMCR, bmcr);
anar = xe_phy_readreg(scp, PHY_ANAR);
anar &= ~(PHY_ANAR_100BT4|PHY_ANAR_100BTXFULL|PHY_ANAR_10BTFULL);
anar |= PHY_ANAR_100BTXHALF|PHY_ANAR_10BTHALF;
xe_phy_writereg(scp, PHY_ANAR, anar);
bmcr |= PHY_BMCR_AUTONEGENBL|PHY_BMCR_AUTONEGRSTR;
xe_phy_writereg(scp, PHY_BMCR, bmcr);
scp->autoneg_status = XE_AUTONEG_STARTED;
scp->chand = timeout(xe_setmedia, scp, hz * 7/2);
return;
}
else {
scp->autoneg_status = XE_AUTONEG_FAIL;
}
break;
case XE_AUTONEG_STARTED:
bmsr = xe_phy_readreg(scp, PHY_BMSR);
lpar = xe_phy_readreg(scp, PHY_LPAR);
if (bmsr & (PHY_BMSR_AUTONEGCOMP|PHY_BMSR_LINKSTAT)) {
#if XE_DEBUG > 1
device_printf(scp->dev, "Autonegotiation complete!\n");
#endif
/*
* XXX - Shouldn't have to do this, but (on my hub at least) the
* XXX - transmitter won't work after a successful autoneg. So we see
* XXX - what the negotiation result was and force that mode. I'm
* XXX - sure there is an easy fix for this.
*/
if (lpar & PHY_LPAR_100BTXHALF) {
xe_phy_writereg(scp, PHY_BMCR, PHY_BMCR_SPEEDSEL);
XE_MII_DUMP(scp);
XE_SELECT_PAGE(2);
XE_OUTB(XE_MSR, XE_INB(XE_MSR) | 0x08);
scp->media = IFM_ETHER|IFM_100_TX;
scp->autoneg_status = XE_AUTONEG_NONE;
}
else {
/*
* XXX - Bit of a hack going on in here.
* XXX - This is derived from Ken Hughes patch to the Linux driver
* XXX - to make it work with 10Mbit _autonegotiated_ links on CE3B
* XXX - cards. What's a CE3B and how's it differ from a plain CE3?
* XXX - these are the things we need to find out.
*/
xe_phy_writereg(scp, PHY_BMCR, 0x0000);
XE_SELECT_PAGE(2);
/* BEGIN HACK */
XE_OUTB(XE_MSR, XE_INB(XE_MSR) | 0x08);
XE_SELECT_PAGE(0x42);
XE_OUTB(XE_SWC1, 0x80);
scp->media = IFM_ETHER|IFM_10_T;
scp->autoneg_status = XE_AUTONEG_NONE;
/* END HACK */
/*XE_OUTB(XE_MSR, XE_INB(XE_MSR) & ~0x08);*/ /* Disable PHY? */
/*scp->autoneg_status = XE_AUTONEG_FAIL;*/
}
}
else {
#if XE_DEBUG > 1
device_printf(scp->dev, "Autonegotiation failed; trying 100baseTX\n");
#endif
XE_MII_DUMP(scp);
xe_soft_reset(scp);
if (scp->phy_ok) {
xe_phy_writereg(scp, PHY_BMCR, PHY_BMCR_SPEEDSEL);
scp->autoneg_status = XE_AUTONEG_100TX;
scp->chand = timeout(xe_setmedia, scp, hz * 3);
return;
}
else {
scp->autoneg_status = XE_AUTONEG_FAIL;
}
}
break;
case XE_AUTONEG_100TX:
(void)xe_phy_readreg(scp, PHY_BMSR);
bmsr = xe_phy_readreg(scp, PHY_BMSR);
if (bmsr & PHY_BMSR_LINKSTAT) {
#if XE_DEBUG > 1
device_printf(scp->dev, "Got 100baseTX link!\n");
#endif
XE_MII_DUMP(scp);
XE_SELECT_PAGE(2);
XE_OUTB(XE_MSR, XE_INB(XE_MSR) | 0x08);
scp->media = IFM_ETHER|IFM_100_TX;
scp->autoneg_status = XE_AUTONEG_NONE;
}
else {
#if XE_DEBUG > 1
device_printf(scp->dev, "Autonegotiation failed; disabling PHY\n");
#endif
XE_MII_DUMP(scp);
xe_phy_writereg(scp, PHY_BMCR, 0x0000);
XE_SELECT_PAGE(2);
XE_OUTB(XE_MSR, XE_INB(XE_MSR) & ~0x08); /* Disable PHY? */
scp->autoneg_status = XE_AUTONEG_FAIL;
}
break;
}
/*
* If we got down here _and_ autoneg_status is XE_AUTONEG_FAIL, then
* either autonegotiation failed, or never got started to begin with. In
* either case, select a suitable 10Mbit media and hope it works. We
* don't need to reset the card again, since it will have been done
* already by the big switch above.
*/
if (scp->autoneg_status == XE_AUTONEG_FAIL) {
#if XE_DEBUG > 1
device_printf(scp->dev, "Selecting 10baseX\n");
#endif
if (scp->mohawk) {
XE_SELECT_PAGE(0x42);
XE_OUTB(XE_SWC1, 0x80);
scp->media = IFM_ETHER|IFM_10_T;
scp->autoneg_status = XE_AUTONEG_NONE;
}
else {
XE_SELECT_PAGE(4);
XE_OUTB(XE_GPR0, 4);
DELAY(50000);
XE_SELECT_PAGE(0x42);
XE_OUTB(XE_SWC1, (XE_INB(XE_ESR) & XE_ESR_MEDIA_SELECT) ? 0x80 : 0xc0);
scp->media = IFM_ETHER|((XE_INB(XE_ESR) & XE_ESR_MEDIA_SELECT) ? IFM_10_T : IFM_10_2);
scp->autoneg_status = XE_AUTONEG_NONE;
}
}
break;
/*
* If a specific media has been requested, we just reset the card and
* select it (one small exception -- if 100baseTX is requested by there is
* no PHY, we fall back to 10baseT operation).
*/
case IFM_100_TX: /* Force 100baseTX */
xe_soft_reset(scp);
if (scp->phy_ok) {
#if XE_DEBUG > 1
device_printf(scp->dev, "Selecting 100baseTX\n");
#endif
XE_SELECT_PAGE(0x42);
XE_OUTB(XE_SWC1, 0);
xe_phy_writereg(scp, PHY_BMCR, PHY_BMCR_SPEEDSEL);
XE_SELECT_PAGE(2);
XE_OUTB(XE_MSR, XE_INB(XE_MSR) | 0x08);
scp->media |= IFM_100_TX;
break;
}
/* FALLTHROUGH */
case IFM_10_T: /* Force 10baseT */
xe_soft_reset(scp);
#if XE_DEBUG > 1
device_printf(scp->dev, "Selecting 10baseT\n");
#endif
if (scp->phy_ok) {
xe_phy_writereg(scp, PHY_BMCR, 0x0000);
XE_SELECT_PAGE(2);
XE_OUTB(XE_MSR, XE_INB(XE_MSR) & ~0x08); /* Disable PHY */
}
XE_SELECT_PAGE(0x42);
XE_OUTB(XE_SWC1, 0x80);
scp->media |= IFM_10_T;
break;
case IFM_10_2:
xe_soft_reset(scp);
#if XE_DEBUG > 1
device_printf(scp->dev, "Selecting 10base2\n");
#endif
XE_SELECT_PAGE(0x42);
XE_OUTB(XE_SWC1, 0xc0);
scp->media |= IFM_10_2;
break;
}
/*
* Finally, the LEDs are set to match whatever media was chosen and the
* transmitter is unblocked.
*/
#if XE_DEBUG > 1
device_printf(scp->dev, "Setting LEDs\n");
#endif
XE_SELECT_PAGE(2);
switch (IFM_SUBTYPE(scp->media)) {
case IFM_100_TX:
case IFM_10_T:
XE_OUTB(XE_LED, 0x3b);
if (scp->dingo)
XE_OUTB(0x0b, 0x04); /* 100Mbit LED */
break;
case IFM_10_2:
XE_OUTB(XE_LED, 0x3a);
break;
}
/* Restart output? */
scp->ifp->if_flags &= ~IFF_OACTIVE;
xe_init(scp);
}
/*
* Hard reset (power cycle) the card.
*/
static void
xe_hard_reset(struct xe_softc *scp) {
int s;
#ifdef XE_DEBUG
device_printf(scp->dev, "hard_reset\n");
#endif
s = splimp();
/*
* Power cycle the card.
*/
XE_SELECT_PAGE(4);
XE_OUTB(XE_GPR1, 0); /* Power off */
DELAY(40000);
if (scp->mohawk)
XE_OUTB(XE_GPR1, 1); /* And back on again */
else
XE_OUTB(XE_GPR1, 5); /* Also set AIC bit, whatever that is */
DELAY(40000);
XE_SELECT_PAGE(0);
(void)splx(s);
}
/*
* Soft reset the card. Also makes sure that the ML6692 and 10Mbit controller
* are powered up, sets the silicon revision number in softc, disables
* interrupts and checks for the prescence of a 100Mbit PHY. This should
* leave us in a position where we can access the PHY and do media
* selection. The function imposes a 0.5s delay while the hardware powers up.
*/
static void
xe_soft_reset(struct xe_softc *scp) {
int s;
#ifdef XE_DEBUG
device_printf(scp->dev, "soft_reset\n");
#endif
s = splimp();
/*
* Reset the card, (again).
*/
XE_SELECT_PAGE(0);
XE_OUTB(XE_CR, XE_CR_SOFT_RESET);
DELAY(40000);
XE_OUTB(XE_CR, 0);
DELAY(40000);
if (scp->mohawk) {
/*
* set GP1 and GP2 as outputs (bits 2 & 3)
* set GP1 low to power on the ML6692 (bit 0)
* set GP2 high to power on the 10Mhz chip (bit 1)
*/
XE_SELECT_PAGE(4);
XE_OUTB(XE_GPR0, 0x0e);
}
/*
* Wait for everything to wake up.
*/
DELAY(500000);
/*
* Get silicon revision number.
*/
XE_SELECT_PAGE(4);
if (scp->mohawk)
scp->srev = (XE_INB(XE_BOV) & 0x70) >> 4;
else
scp->srev = (XE_INB(XE_BOV) & 0x30) >> 4;
#ifdef XE_DEBUG
device_printf(scp->dev, "silicon revision = %d\n", scp->srev);
#endif
/*
* Shut off interrupts.
*/
xe_disable_intr(scp);
/*
* Check for PHY.
*/
if (scp->mohawk) {
scp->phy_ok = xe_mii_init(scp);
}
XE_SELECT_PAGE(0);
(void)splx(s);
}
/*
* Take interface offline. This is done by powering down the device, which I
* assume means just shutting down the transceiver and Ethernet logic. This
* requires a _hard_ reset to recover from, as we need to power up again.
*/
static void
xe_stop(struct xe_softc *scp) {
int s;
#ifdef XE_DEBUG
device_printf(scp->dev, "stop\n");
#endif
s = splimp();
/*
* Shut off interrupts.
*/
xe_disable_intr(scp);
/*
* Power down.
*/
XE_SELECT_PAGE(4);
XE_OUTB(XE_GPR1, 0);
XE_SELECT_PAGE(0);
/*
* ~IFF_RUNNING == interface down.
*/
scp->ifp->if_flags &= ~IFF_RUNNING;
scp->ifp->if_flags &= ~IFF_OACTIVE;
scp->ifp->if_timer = 0;
(void)splx(s);
}
/*
* Enable Ethernet interrupts from the card.
*/
static void
xe_enable_intr(struct xe_softc *scp) {
#ifdef XE_DEBUG
device_printf(scp->dev, "enable_intr\n");
#endif
XE_SELECT_PAGE(1);
XE_OUTB(XE_IMR0, 0xff); /* Unmask everything */
XE_OUTB(XE_IMR1, 0x01); /* Unmask TX underrun detection */
DELAY(1);
XE_SELECT_PAGE(0);
XE_OUTB(XE_CR, XE_CR_ENABLE_INTR); /* Enable interrupts */
if (scp->modem && !scp->dingo) { /* This bit is just magic */
if (!(XE_INB(0x10) & 0x01)) {
XE_OUTB(0x10, 0x11); /* Unmask master int enable bit */
}
}
}
/*
* Disable all Ethernet interrupts from the card.
*/
static void
xe_disable_intr(struct xe_softc *scp) {
#ifdef XE_DEBUG
device_printf(scp->dev, "disable_intr\n");
#endif
XE_SELECT_PAGE(0);
XE_OUTB(XE_CR, 0); /* Disable interrupts */
if (scp->modem && !scp->dingo) { /* More magic (does this work?) */
XE_OUTB(0x10, 0x10); /* Mask the master int enable bit */
}
XE_SELECT_PAGE(1);
XE_OUTB(XE_IMR0, 0); /* Forbid all interrupts */
XE_OUTB(XE_IMR1, 0);
XE_SELECT_PAGE(0);
}
/*
* Set up multicast filter and promiscuous mode
*/
static void
xe_setmulti(struct xe_softc *scp) {
struct ifnet *ifp;
struct ifmultiaddr *maddr;
int count;
ifp = &scp->arpcom.ac_if;
maddr = TAILQ_FIRST(&ifp->if_multiaddrs);
/* Get length of multicast list */
for (count = 0; maddr != NULL; maddr = TAILQ_NEXT(maddr, ifma_link), count++);
if ((ifp->if_flags & IFF_PROMISC) || (ifp->if_flags & IFF_ALLMULTI) || (count > 9)) {
/*
* Go into promiscuous mode if either of the PROMISC or ALLMULTI flags are
* set, or if we have been asked to deal with more than 9 multicast
* addresses. To do this: set MPE and PME in SWC1
*/
XE_SELECT_PAGE(0x42);
XE_OUTB(XE_SWC1, 0x06);
}
else if ((ifp->if_flags & IFF_MULTICAST) && (count > 0)) {
/*
* Program the filters for up to 9 addresses
*/
XE_SELECT_PAGE(0x42);
XE_OUTB(XE_SWC1, 0x01);
XE_SELECT_PAGE(0x40);
XE_OUTB(XE_CMD0, XE_CMD0_OFFLINE);
/*xe_reg_dump(scp);*/
xe_setaddrs(scp);
/*xe_reg_dump(scp);*/
XE_SELECT_PAGE(0x40);
XE_OUTB(XE_CMD0, XE_CMD0_RX_ENABLE|XE_CMD0_ONLINE);
}
else {
/*
* No multicast operation (default)
*/
XE_SELECT_PAGE(0x42);
XE_OUTB(XE_SWC1, 0);
}
XE_SELECT_PAGE(0);
}
/*
* Set up all on-chip addresses (for multicast). AFAICS, there are 10
* of these things; the first is our MAC address, the other 9 are mcast
* addresses, padded with the MAC address if there aren't enough.
* XXX - This doesn't work right, but I'm not sure why yet. We seem to be
* XXX - doing much the same as the Linux code, which is weird enough that
* XXX - it's probably right (despite my earlier comments to the contrary).
*/
static void
xe_setaddrs(struct xe_softc *scp) {
struct ifmultiaddr *maddr;
u_int8_t *addr;
u_int8_t page, slot, byte, i;
maddr = TAILQ_FIRST(&scp->arpcom.ac_if.if_multiaddrs);
XE_SELECT_PAGE(page = 0x50);
for (slot = 0, byte = 8; slot < 10; slot++) {
if (slot == 0)
addr = (u_int8_t *)(&scp->arpcom.ac_enaddr);
else {
while (maddr != NULL && maddr->ifma_addr->sa_family != AF_LINK)
maddr = TAILQ_NEXT(maddr, ifma_link);
if (maddr != NULL)
addr = LLADDR((struct sockaddr_dl *)maddr->ifma_addr);
else
addr = (u_int8_t *)(&scp->arpcom.ac_enaddr);
}
for (i = 0; i < 6; i++, byte++) {
#if XE_DEBUG > 2
if (i)
printf(":%x", addr[i]);
else
device_printf(scp->dev, "individual addresses %d: %x", slot, addr[0]);
#endif
if (byte > 15) {
page++;
byte = 8;
XE_SELECT_PAGE(page);
}
if (scp->mohawk)
XE_OUTB(byte, addr[5 - i]);
else
XE_OUTB(byte, addr[i]);
}
#if XE_DEBUG > 2
printf("\n");
#endif
}
XE_SELECT_PAGE(0);
}
/*
* Write an outgoing packet to the card using programmed I/O.
*/
static int
xe_pio_write_packet(struct xe_softc *scp, struct mbuf *mbp) {
struct mbuf *mbp2;
u_int16_t len, pad, free;
u_int8_t *data;
u_int8_t savebyte[2], wantbyte;
/* Get total packet length */
for (len = 0, mbp2 = mbp; mbp2 != NULL; len += mbp2->m_len, mbp2 = mbp2->m_next);
/* Packets < minimum length may need to be padded out */
pad = 0;
if (len < ETHER_MIN_LEN - ETHER_CRC_LEN) {
pad = (ETHER_MIN_LEN - ETHER_CRC_LEN - len + 1) >> 1;
len = ETHER_MIN_LEN - ETHER_CRC_LEN;
}
/* Check transmit buffer space */
XE_SELECT_PAGE(0);
XE_OUTW(XE_TRS, len+2);
free = XE_INW(XE_TSO);
free &= 0x7fff;
if (free <= len + 2)
return 1;
/* Send packet length to card */
XE_OUTW(XE_EDP, len);
/*
* Write packet to card using PIO (code stolen from the ed driver)
*/
wantbyte = 0;
while (mbp != NULL) {
len = mbp->m_len;
if (len > 0) {
data = mtod(mbp, caddr_t);
if (wantbyte) { /* Finish the last word */
savebyte[1] = *data;
XE_OUTW(XE_EDP, *(u_short *)savebyte);
data++;
len--;
wantbyte = 0;
}
if (len > 1) { /* Output contiguous words */
bus_space_write_multi_2(scp->bst, scp->bsh, XE_EDP, (u_int16_t *) data,
len >> 1);
data += len & ~1;
len &= 1;
}
if (len == 1) { /* Save last byte, if necessary */
savebyte[0] = *data;
wantbyte = 1;
}
}
mbp = mbp->m_next;
}
if (wantbyte) /* Last byte for odd-length packets */
XE_OUTW(XE_EDP, *(u_short *)savebyte);
/*
* For CE3 cards, just tell 'em to send -- apparently the card will pad out
* short packets with random cruft. Otherwise, write nonsense words to fill
* out the packet. I guess it is then sent automatically (?)
*/
if (scp->mohawk)
XE_OUTB(XE_CR, XE_CR_TX_PACKET|XE_CR_ENABLE_INTR);
else
while (pad > 0) {
XE_OUTW(XE_EDP, 0xdead);
pad--;
}
return 0;
}
/*
* Compute the 32-bit Ethernet CRC for the given buffer.
*/
static u_int32_t
xe_compute_crc(u_int8_t *data, int len) {
u_int32_t crc = 0xffffffff;
u_int32_t poly = 0x04c11db6;
u_int8_t current, crc31, bit;
int i, k;
for (i = 0; i < len; i++) {
current = data[i];
for (k = 1; k <= 8; k++) {
if (crc & 0x80000000) {
crc31 = 0x01;
}
else {
crc31 = 0;
}
bit = crc31 ^ (current & 0x01);
crc <<= 1;
current >>= 1;
if (bit) {
crc = (crc ^ poly)|1;
}
}
}
return crc;
}
/*
* Convert a CRC into an index into the multicast hash table. What we do is
* take the most-significant 6 bits of the CRC, reverse them, and use that as
* the bit number in the hash table. Bits 5:3 of the result give the byte
* within the table (0-7); bits 2:0 give the bit number within that byte (also
* 0-7), ie. the number of shifts needed to get it into the lsb position.
*/
static int
xe_compute_hashbit(u_int32_t crc) {
u_int8_t hashbit = 0;
int i;
for (i = 0; i < 6; i++) {
hashbit >>= 1;
if (crc & 0x80000000) {
hashbit &= 0x80;
}
crc <<= 1;
}
return (hashbit >> 2);
}
/**************************************************************
* *
* M I I F U N C T I O N S *
* *
**************************************************************/
/*
* Alternative MII/PHY handling code adapted from the xl driver. It doesn't
* seem to work any better than the xirc2_ps stuff, but it's cleaner code.
* XXX - this stuff shouldn't be here. It should all be abstracted off to
* XXX - some kind of common MII-handling code, shared by all drivers. But
* XXX - that's a whole other mission.
*/
#define XE_MII_SET(x) XE_OUTB(XE_GPR2, (XE_INB(XE_GPR2) | 0x04) | (x))
#define XE_MII_CLR(x) XE_OUTB(XE_GPR2, (XE_INB(XE_GPR2) | 0x04) & ~(x))
/*
* Sync the PHYs by setting data bit and strobing the clock 32 times.
*/
static void
xe_mii_sync(struct xe_softc *scp) {
register int i;
XE_SELECT_PAGE(2);
XE_MII_SET(XE_MII_DIR|XE_MII_WRD);
for (i = 0; i < 32; i++) {
XE_MII_SET(XE_MII_CLK);
DELAY(1);
XE_MII_CLR(XE_MII_CLK);
DELAY(1);
}
}
/*
* Look for a MII-compliant PHY. If we find one, reset it.
*/
static int
xe_mii_init(struct xe_softc *scp) {
u_int16_t status;
status = xe_phy_readreg(scp, PHY_BMSR);
if ((status & 0xff00) != 0x7800) {
#if XE_DEBUG > 1
device_printf(scp->dev, "no PHY found, %0x\n", status);
#endif
return 0;
}
else {
#if XE_DEBUG > 1
device_printf(scp->dev, "PHY OK!\n");
#endif
/* Reset the PHY */
xe_phy_writereg(scp, PHY_BMCR, PHY_BMCR_RESET);
DELAY(500);
while(xe_phy_readreg(scp, PHY_BMCR) & PHY_BMCR_RESET);
XE_MII_DUMP(scp);
return 1;
}
}
/*
* Clock a series of bits through the MII.
*/
static void
xe_mii_send(struct xe_softc *scp, u_int32_t bits, int cnt) {
int i;
XE_SELECT_PAGE(2);
XE_MII_CLR(XE_MII_CLK);
for (i = (0x1 << (cnt - 1)); i; i >>= 1) {
if (bits & i) {
XE_MII_SET(XE_MII_WRD);
} else {
XE_MII_CLR(XE_MII_WRD);
}
DELAY(1);
XE_MII_CLR(XE_MII_CLK);
DELAY(1);
XE_MII_SET(XE_MII_CLK);
}
}
/*
* Read an PHY register through the MII.
*/
static int
xe_mii_readreg(struct xe_softc *scp, struct xe_mii_frame *frame) {
int i, ack, s;
s = splimp();
/*
* Set up frame for RX.
*/
frame->mii_stdelim = XE_MII_STARTDELIM;
frame->mii_opcode = XE_MII_READOP;
frame->mii_turnaround = 0;
frame->mii_data = 0;
XE_SELECT_PAGE(2);
XE_OUTB(XE_GPR2, 0);
/*
* Turn on data xmit.
*/
XE_MII_SET(XE_MII_DIR);
xe_mii_sync(scp);
/*
* Send command/address info.
*/
xe_mii_send(scp, frame->mii_stdelim, 2);
xe_mii_send(scp, frame->mii_opcode, 2);
xe_mii_send(scp, frame->mii_phyaddr, 5);
xe_mii_send(scp, frame->mii_regaddr, 5);
/* Idle bit */
XE_MII_CLR((XE_MII_CLK|XE_MII_WRD));
DELAY(1);
XE_MII_SET(XE_MII_CLK);
DELAY(1);
/* Turn off xmit. */
XE_MII_CLR(XE_MII_DIR);
/* Check for ack */
XE_MII_CLR(XE_MII_CLK);
DELAY(1);
ack = XE_INB(XE_GPR2) & XE_MII_RDD;
XE_MII_SET(XE_MII_CLK);
DELAY(1);
/*
* 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++) {
XE_MII_CLR(XE_MII_CLK);
DELAY(1);
XE_MII_SET(XE_MII_CLK);
DELAY(1);
}
goto fail;
}
for (i = 0x8000; i; i >>= 1) {
XE_MII_CLR(XE_MII_CLK);
DELAY(1);
if (!ack) {
if (XE_INB(XE_GPR2) & XE_MII_RDD)
frame->mii_data |= i;
DELAY(1);
}
XE_MII_SET(XE_MII_CLK);
DELAY(1);
}
fail:
XE_MII_CLR(XE_MII_CLK);
DELAY(1);
XE_MII_SET(XE_MII_CLK);
DELAY(1);
splx(s);
if (ack)
return(1);
return(0);
}
/*
* Write to a PHY register through the MII.
*/
static int
xe_mii_writereg(struct xe_softc *scp, struct xe_mii_frame *frame) {
int s;
s = splimp();
/*
* Set up frame for TX.
*/
frame->mii_stdelim = XE_MII_STARTDELIM;
frame->mii_opcode = XE_MII_WRITEOP;
frame->mii_turnaround = XE_MII_TURNAROUND;
XE_SELECT_PAGE(2);
/*
* Turn on data output.
*/
XE_MII_SET(XE_MII_DIR);
xe_mii_sync(scp);
xe_mii_send(scp, frame->mii_stdelim, 2);
xe_mii_send(scp, frame->mii_opcode, 2);
xe_mii_send(scp, frame->mii_phyaddr, 5);
xe_mii_send(scp, frame->mii_regaddr, 5);
xe_mii_send(scp, frame->mii_turnaround, 2);
xe_mii_send(scp, frame->mii_data, 16);
/* Idle bit. */
XE_MII_SET(XE_MII_CLK);
DELAY(1);
XE_MII_CLR(XE_MII_CLK);
DELAY(1);
/*
* Turn off xmit.
*/
XE_MII_CLR(XE_MII_DIR);
splx(s);
return(0);
}
/*
* Read a register from the PHY.
*/
static u_int16_t
xe_phy_readreg(struct xe_softc *scp, u_int16_t reg) {
struct xe_mii_frame frame;
bzero((char *)&frame, sizeof(frame));
frame.mii_phyaddr = 0;
frame.mii_regaddr = reg;
xe_mii_readreg(scp, &frame);
return(frame.mii_data);
}
/*
* Write to a PHY register.
*/
static void
xe_phy_writereg(struct xe_softc *scp, u_int16_t reg, u_int16_t data) {
struct xe_mii_frame frame;
bzero((char *)&frame, sizeof(frame));
frame.mii_phyaddr = 0;
frame.mii_regaddr = reg;
frame.mii_data = data;
xe_mii_writereg(scp, &frame);
return;
}
#ifdef XE_DEBUG
/*
* A bit of debugging code.
*/
static void
xe_mii_dump(struct xe_softc *scp) {
int i, s;
s = splimp();
device_printf(scp->dev, "MII registers: ");
for (i = 0; i < 2; i++) {
printf(" %d:%04x", i, xe_phy_readreg(scp, i));
}
for (i = 4; i < 7; i++) {
printf(" %d:%04x", i, xe_phy_readreg(scp, i));
}
printf("\n");
(void)splx(s);
}
static void
xe_reg_dump(struct xe_softc *scp) {
int page, i, s;
s = splimp();
device_printf(scp->dev, "Common registers: ");
for (i = 0; i < 8; i++) {
printf(" %2.2x", XE_INB(i));
}
printf("\n");
for (page = 0; page <= 8; page++) {
device_printf(scp->dev, "Register page %2.2x: ", page);
XE_SELECT_PAGE(page);
for (i = 8; i < 16; i++) {
printf(" %2.2x", XE_INB(i));
}
printf("\n");
}
for (page = 0x10; page < 0x5f; page++) {
if ((page >= 0x11 && page <= 0x3f) ||
(page == 0x41) ||
(page >= 0x43 && page <= 0x4f) ||
(page >= 0x59))
continue;
device_printf(scp->dev, "Register page %2.2x: ", page);
XE_SELECT_PAGE(page);
for (i = 8; i < 16; i++) {
printf(" %2.2x", XE_INB(i));
}
printf("\n");
}
(void)splx(s);
}
#endif
int
xe_activate(device_t dev)
{
struct xe_softc *sc = device_get_softc(dev);
int start, err;
if (!sc->dingo) {
sc->port_rid = 0; /* 0 is managed by pccard */
sc->port_res = bus_alloc_resource(dev, SYS_RES_IOPORT,
&sc->port_rid, 0, ~0, 16, RF_ACTIVE);
} else {
/*
* Find a 16 byte aligned ioport for the card.
*/
#if XE_DEBUG > 0
device_printf(dev, "Finding an aligned port for RealPort\n");
#endif /* XE_DEBUG */
sc->port_rid = 1; /* 0 is managed by pccard */
start = 0x100;
do {
sc->port_res = bus_alloc_resource(dev,
SYS_RES_IOPORT, &sc->port_rid, start, 0x3ff, 16,
RF_ACTIVE);
if (sc->port_res == 0)
break; /* we failed */
if ((rman_get_start(sc->port_res) & 0xf) == 0)
break; /* good */
bus_release_resource(dev, SYS_RES_IOPORT, sc->port_rid,
sc->port_res);
start = (rman_get_start(sc->port_res) + 15) & ~0xf;
} while (1);
#if XE_DEBUG > 2
device_printf(dev, "port 0x%0lx, size 0x%0lx\n",
bus_get_resource_start(dev, SYS_RES_IOPORT, sc->port_rid),
bus_get_resource_count(dev, SYS_RES_IOPORT, sc->port_rid));
#endif /* XE_DEBUG */
}
if (!sc->port_res) {
#if XE_DEBUG > 0
device_printf(dev, "Cannot allocate ioport\n");
#endif
return ENOMEM;
}
sc->irq_rid = 0;
sc->irq_res = bus_alloc_resource(dev, SYS_RES_IRQ, &sc->irq_rid,
0, ~0, 1, RF_ACTIVE);
if (!sc->irq_res) {
#if XE_DEBUG > 0
device_printf(dev, "Cannot allocate irq\n");
#endif
xe_deactivate(dev);
return ENOMEM;
}
if ((err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_NET, xe_intr, sc,
&sc->intrhand)) != 0) {
xe_deactivate(dev);
return err;
}
sc->bst = rman_get_bustag(sc->port_res);
sc->bsh = rman_get_bushandle(sc->port_res);
return (0);
}
void
xe_deactivate(device_t dev)
{
struct xe_softc *sc = device_get_softc(dev);
if (sc->intrhand)
bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
sc->intrhand = 0;
if (sc->port_res)
bus_release_resource(dev, SYS_RES_IOPORT, sc->port_rid,
sc->port_res);
sc->port_res = 0;
if (sc->irq_res)
bus_release_resource(dev, SYS_RES_IRQ, sc->irq_rid,
sc->irq_res);
sc->irq_res = 0;
return;
}
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