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6e50170633
freebsd-dev/sys/dev/pcn/if_pcn.c
Kevin Lo 648b0509e6 Fix logic error
2012-02-27 08:57:02 +00:00

1519 lines
36 KiB
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/*-
* Copyright (c) 2000 Berkeley Software Design, Inc.
* Copyright (c) 1997, 1998, 1999, 2000
* Bill Paul <wpaul@osd.bsdi.com>. 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* AMD Am79c972 fast ethernet PCI NIC driver. Datasheets are available
* from http://www.amd.com.
*
* The AMD PCnet/PCI controllers are more advanced and functional
* versions of the venerable 7990 LANCE. The PCnet/PCI chips retain
* backwards compatibility with the LANCE and thus can be made
* to work with older LANCE drivers. This is in fact how the
* PCnet/PCI chips were supported in FreeBSD originally. The trouble
* is that the PCnet/PCI devices offer several performance enhancements
* which can't be exploited in LANCE compatibility mode. Chief among
* these enhancements is the ability to perform PCI DMA operations
* using 32-bit addressing (which eliminates the need for ISA
* bounce-buffering), and special receive buffer alignment (which
* allows the receive handler to pass packets to the upper protocol
* layers without copying on both the x86 and alpha platforms).
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/ethernet.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_types.h>
#include <net/bpf.h>
#include <vm/vm.h> /* for vtophys */
#include <vm/pmap.h> /* for vtophys */
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#define PCN_USEIOSPACE
#include <dev/pcn/if_pcnreg.h>
MODULE_DEPEND(pcn, pci, 1, 1, 1);
MODULE_DEPEND(pcn, ether, 1, 1, 1);
MODULE_DEPEND(pcn, miibus, 1, 1, 1);
/* "device miibus" required. See GENERIC if you get errors here. */
#include "miibus_if.h"
/*
* Various supported device vendors/types and their names.
*/
static const struct pcn_type pcn_devs[] = {
{ PCN_VENDORID, PCN_DEVICEID_PCNET, "AMD PCnet/PCI 10/100BaseTX" },
{ PCN_VENDORID, PCN_DEVICEID_HOME, "AMD PCnet/Home HomePNA" },
{ 0, 0, NULL }
};
static const struct pcn_chipid {
u_int32_t id;
const char *name;
} pcn_chipid[] = {
{ Am79C971, "Am79C971" },
{ Am79C972, "Am79C972" },
{ Am79C973, "Am79C973" },
{ Am79C978, "Am79C978" },
{ Am79C975, "Am79C975" },
{ Am79C976, "Am79C976" },
{ 0, NULL },
};
static const char *pcn_chipid_name(u_int32_t);
static u_int32_t pcn_chip_id(device_t);
static const struct pcn_type *pcn_match(u_int16_t, u_int16_t);
static u_int32_t pcn_csr_read(struct pcn_softc *, int);
static u_int16_t pcn_csr_read16(struct pcn_softc *, int);
static u_int16_t pcn_bcr_read16(struct pcn_softc *, int);
static void pcn_csr_write(struct pcn_softc *, int, int);
static u_int32_t pcn_bcr_read(struct pcn_softc *, int);
static void pcn_bcr_write(struct pcn_softc *, int, int);
static int pcn_probe(device_t);
static int pcn_attach(device_t);
static int pcn_detach(device_t);
static int pcn_newbuf(struct pcn_softc *, int, struct mbuf *);
static int pcn_encap(struct pcn_softc *, struct mbuf *, u_int32_t *);
static void pcn_rxeof(struct pcn_softc *);
static void pcn_txeof(struct pcn_softc *);
static void pcn_intr(void *);
static void pcn_tick(void *);
static void pcn_start(struct ifnet *);
static void pcn_start_locked(struct ifnet *);
static int pcn_ioctl(struct ifnet *, u_long, caddr_t);
static void pcn_init(void *);
static void pcn_init_locked(struct pcn_softc *);
static void pcn_stop(struct pcn_softc *);
static void pcn_watchdog(struct pcn_softc *);
static int pcn_shutdown(device_t);
static int pcn_ifmedia_upd(struct ifnet *);
static void pcn_ifmedia_sts(struct ifnet *, struct ifmediareq *);
static int pcn_miibus_readreg(device_t, int, int);
static int pcn_miibus_writereg(device_t, int, int, int);
static void pcn_miibus_statchg(device_t);
static void pcn_setfilt(struct ifnet *);
static void pcn_setmulti(struct pcn_softc *);
static void pcn_reset(struct pcn_softc *);
static int pcn_list_rx_init(struct pcn_softc *);
static int pcn_list_tx_init(struct pcn_softc *);
#ifdef PCN_USEIOSPACE
#define PCN_RES SYS_RES_IOPORT
#define PCN_RID PCN_PCI_LOIO
#else
#define PCN_RES SYS_RES_MEMORY
#define PCN_RID PCN_PCI_LOMEM
#endif
static device_method_t pcn_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, pcn_probe),
DEVMETHOD(device_attach, pcn_attach),
DEVMETHOD(device_detach, pcn_detach),
DEVMETHOD(device_shutdown, pcn_shutdown),
/* MII interface */
DEVMETHOD(miibus_readreg, pcn_miibus_readreg),
DEVMETHOD(miibus_writereg, pcn_miibus_writereg),
DEVMETHOD(miibus_statchg, pcn_miibus_statchg),
DEVMETHOD_END
};
static driver_t pcn_driver = {
"pcn",
pcn_methods,
sizeof(struct pcn_softc)
};
static devclass_t pcn_devclass;
DRIVER_MODULE(pcn, pci, pcn_driver, pcn_devclass, 0, 0);
DRIVER_MODULE(miibus, pcn, miibus_driver, miibus_devclass, 0, 0);
#define PCN_CSR_SETBIT(sc, reg, x) \
pcn_csr_write(sc, reg, pcn_csr_read(sc, reg) | (x))
#define PCN_CSR_CLRBIT(sc, reg, x) \
pcn_csr_write(sc, reg, pcn_csr_read(sc, reg) & ~(x))
#define PCN_BCR_SETBIT(sc, reg, x) \
pcn_bcr_write(sc, reg, pcn_bcr_read(sc, reg) | (x))
#define PCN_BCR_CLRBIT(sc, reg, x) \
pcn_bcr_write(sc, reg, pcn_bcr_read(sc, reg) & ~(x))
static u_int32_t
pcn_csr_read(sc, reg)
struct pcn_softc *sc;
int reg;
{
CSR_WRITE_4(sc, PCN_IO32_RAP, reg);
return(CSR_READ_4(sc, PCN_IO32_RDP));
}
static u_int16_t
pcn_csr_read16(sc, reg)
struct pcn_softc *sc;
int reg;
{
CSR_WRITE_2(sc, PCN_IO16_RAP, reg);
return(CSR_READ_2(sc, PCN_IO16_RDP));
}
static void
pcn_csr_write(sc, reg, val)
struct pcn_softc *sc;
int reg;
int val;
{
CSR_WRITE_4(sc, PCN_IO32_RAP, reg);
CSR_WRITE_4(sc, PCN_IO32_RDP, val);
return;
}
static u_int32_t
pcn_bcr_read(sc, reg)
struct pcn_softc *sc;
int reg;
{
CSR_WRITE_4(sc, PCN_IO32_RAP, reg);
return(CSR_READ_4(sc, PCN_IO32_BDP));
}
static u_int16_t
pcn_bcr_read16(sc, reg)
struct pcn_softc *sc;
int reg;
{
CSR_WRITE_2(sc, PCN_IO16_RAP, reg);
return(CSR_READ_2(sc, PCN_IO16_BDP));
}
static void
pcn_bcr_write(sc, reg, val)
struct pcn_softc *sc;
int reg;
int val;
{
CSR_WRITE_4(sc, PCN_IO32_RAP, reg);
CSR_WRITE_4(sc, PCN_IO32_BDP, val);
return;
}
static int
pcn_miibus_readreg(dev, phy, reg)
device_t dev;
int phy, reg;
{
struct pcn_softc *sc;
int val;
sc = device_get_softc(dev);
/*
* At least Am79C971 with DP83840A wedge when isolating the
* external PHY so we can't allow multiple external PHYs.
* There are cards that use Am79C971 with both the internal
* and an external PHY though.
* For internal PHYs it doesn't really matter whether we can
* isolate the remaining internal and the external ones in
* the PHY drivers as the internal PHYs have to be enabled
* individually in PCN_BCR_PHYSEL, PCN_CSR_MODE, etc.
* With Am79C97{3,5,8} we don't support switching beetween
* the internal and external PHYs, yet, so we can't allow
* multiple PHYs with these either.
* Am79C97{2,6} actually only support external PHYs (not
* connectable internal ones respond at the usual addresses,
* which don't hurt if we let them show up on the bus) and
* isolating them works.
*/
if (((sc->pcn_type == Am79C971 && phy != PCN_PHYAD_10BT) ||
sc->pcn_type == Am79C973 || sc->pcn_type == Am79C975 ||
sc->pcn_type == Am79C978) && sc->pcn_extphyaddr != -1 &&
phy != sc->pcn_extphyaddr)
return(0);
pcn_bcr_write(sc, PCN_BCR_MIIADDR, reg | (phy << 5));
val = pcn_bcr_read(sc, PCN_BCR_MIIDATA) & 0xFFFF;
if (val == 0xFFFF)
return(0);
if (((sc->pcn_type == Am79C971 && phy != PCN_PHYAD_10BT) ||
sc->pcn_type == Am79C973 || sc->pcn_type == Am79C975 ||
sc->pcn_type == Am79C978) && sc->pcn_extphyaddr == -1)
sc->pcn_extphyaddr = phy;
return(val);
}
static int
pcn_miibus_writereg(dev, phy, reg, data)
device_t dev;
int phy, reg, data;
{
struct pcn_softc *sc;
sc = device_get_softc(dev);
pcn_bcr_write(sc, PCN_BCR_MIIADDR, reg | (phy << 5));
pcn_bcr_write(sc, PCN_BCR_MIIDATA, data);
return(0);
}
static void
pcn_miibus_statchg(dev)
device_t dev;
{
struct pcn_softc *sc;
struct mii_data *mii;
sc = device_get_softc(dev);
mii = device_get_softc(sc->pcn_miibus);
if ((mii->mii_media_active & IFM_GMASK) == IFM_FDX) {
PCN_BCR_SETBIT(sc, PCN_BCR_DUPLEX, PCN_DUPLEX_FDEN);
} else {
PCN_BCR_CLRBIT(sc, PCN_BCR_DUPLEX, PCN_DUPLEX_FDEN);
}
return;
}
static void
pcn_setmulti(sc)
struct pcn_softc *sc;
{
struct ifnet *ifp;
struct ifmultiaddr *ifma;
u_int32_t h, i;
u_int16_t hashes[4] = { 0, 0, 0, 0 };
ifp = sc->pcn_ifp;
PCN_CSR_SETBIT(sc, PCN_CSR_EXTCTL1, PCN_EXTCTL1_SPND);
if (ifp->if_flags & IFF_ALLMULTI || ifp->if_flags & IFF_PROMISC) {
for (i = 0; i < 4; i++)
pcn_csr_write(sc, PCN_CSR_MAR0 + i, 0xFFFF);
PCN_CSR_CLRBIT(sc, PCN_CSR_EXTCTL1, PCN_EXTCTL1_SPND);
return;
}
/* first, zot all the existing hash bits */
for (i = 0; i < 4; i++)
pcn_csr_write(sc, PCN_CSR_MAR0 + i, 0);
/* now program new ones */
if_maddr_rlock(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_LINK)
continue;
h = ether_crc32_le(LLADDR((struct sockaddr_dl *)
ifma->ifma_addr), ETHER_ADDR_LEN) >> 26;
hashes[h >> 4] |= 1 << (h & 0xF);
}
if_maddr_runlock(ifp);
for (i = 0; i < 4; i++)
pcn_csr_write(sc, PCN_CSR_MAR0 + i, hashes[i]);
PCN_CSR_CLRBIT(sc, PCN_CSR_EXTCTL1, PCN_EXTCTL1_SPND);
return;
}
static void
pcn_reset(sc)
struct pcn_softc *sc;
{
/*
* Issue a reset by reading from the RESET register.
* Note that we don't know if the chip is operating in
* 16-bit or 32-bit mode at this point, so we attempt
* to reset the chip both ways. If one fails, the other
* will succeed.
*/
CSR_READ_2(sc, PCN_IO16_RESET);
CSR_READ_4(sc, PCN_IO32_RESET);
/* Wait a little while for the chip to get its brains in order. */
DELAY(1000);
/* Select 32-bit (DWIO) mode */
CSR_WRITE_4(sc, PCN_IO32_RDP, 0);
/* Select software style 3. */
pcn_bcr_write(sc, PCN_BCR_SSTYLE, PCN_SWSTYLE_PCNETPCI_BURST);
return;
}
static const char *
pcn_chipid_name(u_int32_t id)
{
const struct pcn_chipid *p;
p = pcn_chipid;
while (p->name) {
if (id == p->id)
return (p->name);
p++;
}
return ("Unknown");
}
static u_int32_t
pcn_chip_id(device_t dev)
{
struct pcn_softc *sc;
u_int32_t chip_id;
sc = device_get_softc(dev);
/*
* Note: we can *NOT* put the chip into
* 32-bit mode yet. The le(4) driver will only
* work in 16-bit mode, and once the chip
* goes into 32-bit mode, the only way to
* get it out again is with a hardware reset.
* So if pcn_probe() is called before the
* le(4) driver's probe routine, the chip will
* be locked into 32-bit operation and the
* le(4) driver will be unable to attach to it.
* Note II: if the chip happens to already
* be in 32-bit mode, we still need to check
* the chip ID, but first we have to detect
* 32-bit mode using only 16-bit operations.
* The safest way to do this is to read the
* PCI subsystem ID from BCR23/24 and compare
* that with the value read from PCI config
* space.
*/
chip_id = pcn_bcr_read16(sc, PCN_BCR_PCISUBSYSID);
chip_id <<= 16;
chip_id |= pcn_bcr_read16(sc, PCN_BCR_PCISUBVENID);
/*
* Note III: the test for 0x10001000 is a hack to
* pacify VMware, who's pseudo-PCnet interface is
* broken. Reading the subsystem register from PCI
* config space yields 0x00000000 while reading the
* same value from I/O space yields 0x10001000. It's
* not supposed to be that way.
*/
if (chip_id == pci_read_config(dev,
PCIR_SUBVEND_0, 4) || chip_id == 0x10001000) {
/* We're in 16-bit mode. */
chip_id = pcn_csr_read16(sc, PCN_CSR_CHIPID1);
chip_id <<= 16;
chip_id |= pcn_csr_read16(sc, PCN_CSR_CHIPID0);
} else {
/* We're in 32-bit mode. */
chip_id = pcn_csr_read(sc, PCN_CSR_CHIPID1);
chip_id <<= 16;
chip_id |= pcn_csr_read(sc, PCN_CSR_CHIPID0);
}
return (chip_id);
}
static const struct pcn_type *
pcn_match(u_int16_t vid, u_int16_t did)
{
const struct pcn_type *t;
t = pcn_devs;
while (t->pcn_name != NULL) {
if ((vid == t->pcn_vid) && (did == t->pcn_did))
return (t);
t++;
}
return (NULL);
}
/*
* Probe for an AMD chip. Check the PCI vendor and device
* IDs against our list and return a device name if we find a match.
*/
static int
pcn_probe(dev)
device_t dev;
{
const struct pcn_type *t;
struct pcn_softc *sc;
int rid;
u_int32_t chip_id;
t = pcn_match(pci_get_vendor(dev), pci_get_device(dev));
if (t == NULL)
return (ENXIO);
sc = device_get_softc(dev);
/*
* Temporarily map the I/O space so we can read the chip ID register.
*/
rid = PCN_RID;
sc->pcn_res = bus_alloc_resource_any(dev, PCN_RES, &rid, RF_ACTIVE);
if (sc->pcn_res == NULL) {
device_printf(dev, "couldn't map ports/memory\n");
return(ENXIO);
}
sc->pcn_btag = rman_get_bustag(sc->pcn_res);
sc->pcn_bhandle = rman_get_bushandle(sc->pcn_res);
chip_id = pcn_chip_id(dev);
bus_release_resource(dev, PCN_RES, PCN_RID, sc->pcn_res);
switch((chip_id >> 12) & PART_MASK) {
case Am79C971:
case Am79C972:
case Am79C973:
case Am79C975:
case Am79C976:
case Am79C978:
break;
default:
return(ENXIO);
}
device_set_desc(dev, t->pcn_name);
return(BUS_PROBE_DEFAULT);
}
/*
* Attach the interface. Allocate softc structures, do ifmedia
* setup and ethernet/BPF attach.
*/
static int
pcn_attach(dev)
device_t dev;
{
u_int32_t eaddr[2];
struct pcn_softc *sc;
struct mii_data *mii;
struct mii_softc *miisc;
struct ifnet *ifp;
int error = 0, rid;
sc = device_get_softc(dev);
/* Initialize our mutex. */
mtx_init(&sc->pcn_mtx, device_get_nameunit(dev), MTX_NETWORK_LOCK,
MTX_DEF);
/*
* Map control/status registers.
*/
pci_enable_busmaster(dev);
/* Retrieve the chip ID */
sc->pcn_type = (pcn_chip_id(dev) >> 12) & PART_MASK;
device_printf(dev, "Chip ID %04x (%s)\n",
sc->pcn_type, pcn_chipid_name(sc->pcn_type));
rid = PCN_RID;
sc->pcn_res = bus_alloc_resource_any(dev, PCN_RES, &rid, RF_ACTIVE);
if (sc->pcn_res == NULL) {
device_printf(dev, "couldn't map ports/memory\n");
error = ENXIO;
goto fail;
}
sc->pcn_btag = rman_get_bustag(sc->pcn_res);
sc->pcn_bhandle = rman_get_bushandle(sc->pcn_res);
/* Allocate interrupt */
rid = 0;
sc->pcn_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_SHAREABLE | RF_ACTIVE);
if (sc->pcn_irq == NULL) {
device_printf(dev, "couldn't map interrupt\n");
error = ENXIO;
goto fail;
}
/* Reset the adapter. */
pcn_reset(sc);
/*
* Get station address from the EEPROM.
*/
eaddr[0] = CSR_READ_4(sc, PCN_IO32_APROM00);
eaddr[1] = CSR_READ_4(sc, PCN_IO32_APROM01);
callout_init_mtx(&sc->pcn_stat_callout, &sc->pcn_mtx, 0);
sc->pcn_ldata = contigmalloc(sizeof(struct pcn_list_data), M_DEVBUF,
M_NOWAIT, 0, 0xffffffff, PAGE_SIZE, 0);
if (sc->pcn_ldata == NULL) {
device_printf(dev, "no memory for list buffers!\n");
error = ENXIO;
goto fail;
}
bzero(sc->pcn_ldata, sizeof(struct pcn_list_data));
ifp = sc->pcn_ifp = if_alloc(IFT_ETHER);
if (ifp == NULL) {
device_printf(dev, "can not if_alloc()\n");
error = ENOSPC;
goto fail;
}
ifp->if_softc = sc;
if_initname(ifp, device_get_name(dev), device_get_unit(dev));
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_ioctl = pcn_ioctl;
ifp->if_start = pcn_start;
ifp->if_init = pcn_init;
ifp->if_snd.ifq_maxlen = PCN_TX_LIST_CNT - 1;
/*
* Do MII setup.
* See the comment in pcn_miibus_readreg() for why we can't
* universally pass MIIF_NOISOLATE here.
*/
sc->pcn_extphyaddr = -1;
error = mii_attach(dev, &sc->pcn_miibus, ifp, pcn_ifmedia_upd,
pcn_ifmedia_sts, BMSR_DEFCAPMASK, MII_PHY_ANY, MII_OFFSET_ANY, 0);
if (error != 0) {
device_printf(dev, "attaching PHYs failed\n");
goto fail;
}
/*
* Record the media instances of internal PHYs, which map the
* built-in interfaces to the MII, so we can set the active
* PHY/port based on the currently selected media.
*/
sc->pcn_inst_10bt = -1;
mii = device_get_softc(sc->pcn_miibus);
LIST_FOREACH(miisc, &mii->mii_phys, mii_list) {
switch (miisc->mii_phy) {
case PCN_PHYAD_10BT:
sc->pcn_inst_10bt = miisc->mii_inst;
break;
/*
* XXX deal with the Am79C97{3,5} internal 100baseT
* and the Am79C978 internal HomePNA PHYs.
*/
}
}
/*
* Call MI attach routine.
*/
ether_ifattach(ifp, (u_int8_t *) eaddr);
/* Hook interrupt last to avoid having to lock softc */
error = bus_setup_intr(dev, sc->pcn_irq, INTR_TYPE_NET | INTR_MPSAFE,
NULL, pcn_intr, sc, &sc->pcn_intrhand);
if (error) {
device_printf(dev, "couldn't set up irq\n");
ether_ifdetach(ifp);
goto fail;
}
fail:
if (error)
pcn_detach(dev);
return(error);
}
/*
* Shutdown hardware and free up resources. This can be called any
* time after the mutex has been initialized. It is called in both
* the error case in attach and the normal detach case so it needs
* to be careful about only freeing resources that have actually been
* allocated.
*/
static int
pcn_detach(dev)
device_t dev;
{
struct pcn_softc *sc;
struct ifnet *ifp;
sc = device_get_softc(dev);
ifp = sc->pcn_ifp;
KASSERT(mtx_initialized(&sc->pcn_mtx), ("pcn mutex not initialized"));
/* These should only be active if attach succeeded */
if (device_is_attached(dev)) {
PCN_LOCK(sc);
pcn_reset(sc);
pcn_stop(sc);
PCN_UNLOCK(sc);
callout_drain(&sc->pcn_stat_callout);
ether_ifdetach(ifp);
}
if (sc->pcn_miibus)
device_delete_child(dev, sc->pcn_miibus);
bus_generic_detach(dev);
if (sc->pcn_intrhand)
bus_teardown_intr(dev, sc->pcn_irq, sc->pcn_intrhand);
if (sc->pcn_irq)
bus_release_resource(dev, SYS_RES_IRQ, 0, sc->pcn_irq);
if (sc->pcn_res)
bus_release_resource(dev, PCN_RES, PCN_RID, sc->pcn_res);
if (ifp)
if_free(ifp);
if (sc->pcn_ldata) {
contigfree(sc->pcn_ldata, sizeof(struct pcn_list_data),
M_DEVBUF);
}
mtx_destroy(&sc->pcn_mtx);
return(0);
}
/*
* Initialize the transmit descriptors.
*/
static int
pcn_list_tx_init(sc)
struct pcn_softc *sc;
{
struct pcn_list_data *ld;
struct pcn_ring_data *cd;
int i;
cd = &sc->pcn_cdata;
ld = sc->pcn_ldata;
for (i = 0; i < PCN_TX_LIST_CNT; i++) {
cd->pcn_tx_chain[i] = NULL;
ld->pcn_tx_list[i].pcn_tbaddr = 0;
ld->pcn_tx_list[i].pcn_txctl = 0;
ld->pcn_tx_list[i].pcn_txstat = 0;
}
cd->pcn_tx_prod = cd->pcn_tx_cons = cd->pcn_tx_cnt = 0;
return(0);
}
/*
* Initialize the RX descriptors and allocate mbufs for them.
*/
static int
pcn_list_rx_init(sc)
struct pcn_softc *sc;
{
struct pcn_ring_data *cd;
int i;
cd = &sc->pcn_cdata;
for (i = 0; i < PCN_RX_LIST_CNT; i++) {
if (pcn_newbuf(sc, i, NULL) == ENOBUFS)
return(ENOBUFS);
}
cd->pcn_rx_prod = 0;
return(0);
}
/*
* Initialize an RX descriptor and attach an MBUF cluster.
*/
static int
pcn_newbuf(sc, idx, m)
struct pcn_softc *sc;
int idx;
struct mbuf *m;
{
struct mbuf *m_new = NULL;
struct pcn_rx_desc *c;
c = &sc->pcn_ldata->pcn_rx_list[idx];
if (m == NULL) {
MGETHDR(m_new, M_DONTWAIT, MT_DATA);
if (m_new == NULL)
return(ENOBUFS);
MCLGET(m_new, M_DONTWAIT);
if (!(m_new->m_flags & M_EXT)) {
m_freem(m_new);
return(ENOBUFS);
}
m_new->m_len = m_new->m_pkthdr.len = MCLBYTES;
} else {
m_new = m;
m_new->m_len = m_new->m_pkthdr.len = MCLBYTES;
m_new->m_data = m_new->m_ext.ext_buf;
}
m_adj(m_new, ETHER_ALIGN);
sc->pcn_cdata.pcn_rx_chain[idx] = m_new;
c->pcn_rbaddr = vtophys(mtod(m_new, caddr_t));
c->pcn_bufsz = (~(PCN_RXLEN) + 1) & PCN_RXLEN_BUFSZ;
c->pcn_bufsz |= PCN_RXLEN_MBO;
c->pcn_rxstat = PCN_RXSTAT_STP|PCN_RXSTAT_ENP|PCN_RXSTAT_OWN;
return(0);
}
/*
* A frame has been uploaded: pass the resulting mbuf chain up to
* the higher level protocols.
*/
static void
pcn_rxeof(sc)
struct pcn_softc *sc;
{
struct mbuf *m;
struct ifnet *ifp;
struct pcn_rx_desc *cur_rx;
int i;
PCN_LOCK_ASSERT(sc);
ifp = sc->pcn_ifp;
i = sc->pcn_cdata.pcn_rx_prod;
while(PCN_OWN_RXDESC(&sc->pcn_ldata->pcn_rx_list[i])) {
cur_rx = &sc->pcn_ldata->pcn_rx_list[i];
m = sc->pcn_cdata.pcn_rx_chain[i];
sc->pcn_cdata.pcn_rx_chain[i] = NULL;
/*
* If an error occurs, update stats, clear the
* status word and leave the mbuf cluster in place:
* it should simply get re-used next time this descriptor
* comes up in the ring.
*/
if (cur_rx->pcn_rxstat & PCN_RXSTAT_ERR) {
ifp->if_ierrors++;
pcn_newbuf(sc, i, m);
PCN_INC(i, PCN_RX_LIST_CNT);
continue;
}
if (pcn_newbuf(sc, i, NULL)) {
/* Ran out of mbufs; recycle this one. */
pcn_newbuf(sc, i, m);
ifp->if_ierrors++;
PCN_INC(i, PCN_RX_LIST_CNT);
continue;
}
PCN_INC(i, PCN_RX_LIST_CNT);
/* No errors; receive the packet. */
ifp->if_ipackets++;
m->m_len = m->m_pkthdr.len =
cur_rx->pcn_rxlen - ETHER_CRC_LEN;
m->m_pkthdr.rcvif = ifp;
PCN_UNLOCK(sc);
(*ifp->if_input)(ifp, m);
PCN_LOCK(sc);
}
sc->pcn_cdata.pcn_rx_prod = i;
return;
}
/*
* A frame was downloaded to the chip. It's safe for us to clean up
* the list buffers.
*/
static void
pcn_txeof(sc)
struct pcn_softc *sc;
{
struct pcn_tx_desc *cur_tx = NULL;
struct ifnet *ifp;
u_int32_t idx;
ifp = sc->pcn_ifp;
/*
* Go through our tx list and free mbufs for those
* frames that have been transmitted.
*/
idx = sc->pcn_cdata.pcn_tx_cons;
while (idx != sc->pcn_cdata.pcn_tx_prod) {
cur_tx = &sc->pcn_ldata->pcn_tx_list[idx];
if (!PCN_OWN_TXDESC(cur_tx))
break;
if (!(cur_tx->pcn_txctl & PCN_TXCTL_ENP)) {
sc->pcn_cdata.pcn_tx_cnt--;
PCN_INC(idx, PCN_TX_LIST_CNT);
continue;
}
if (cur_tx->pcn_txctl & PCN_TXCTL_ERR) {
ifp->if_oerrors++;
if (cur_tx->pcn_txstat & PCN_TXSTAT_EXDEF)
ifp->if_collisions++;
if (cur_tx->pcn_txstat & PCN_TXSTAT_RTRY)
ifp->if_collisions++;
}
ifp->if_collisions +=
cur_tx->pcn_txstat & PCN_TXSTAT_TRC;
ifp->if_opackets++;
if (sc->pcn_cdata.pcn_tx_chain[idx] != NULL) {
m_freem(sc->pcn_cdata.pcn_tx_chain[idx]);
sc->pcn_cdata.pcn_tx_chain[idx] = NULL;
}
sc->pcn_cdata.pcn_tx_cnt--;
PCN_INC(idx, PCN_TX_LIST_CNT);
}
if (idx != sc->pcn_cdata.pcn_tx_cons) {
/* Some buffers have been freed. */
sc->pcn_cdata.pcn_tx_cons = idx;
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
}
sc->pcn_timer = (sc->pcn_cdata.pcn_tx_cnt == 0) ? 0 : 5;
return;
}
static void
pcn_tick(xsc)
void *xsc;
{
struct pcn_softc *sc;
struct mii_data *mii;
struct ifnet *ifp;
sc = xsc;
ifp = sc->pcn_ifp;
PCN_LOCK_ASSERT(sc);
mii = device_get_softc(sc->pcn_miibus);
mii_tick(mii);
/* link just died */
if (sc->pcn_link && !(mii->mii_media_status & IFM_ACTIVE))
sc->pcn_link = 0;
/* link just came up, restart */
if (!sc->pcn_link && mii->mii_media_status & IFM_ACTIVE &&
IFM_SUBTYPE(mii->mii_media_active) != IFM_NONE) {
sc->pcn_link++;
if (ifp->if_snd.ifq_head != NULL)
pcn_start_locked(ifp);
}
if (sc->pcn_timer > 0 && --sc->pcn_timer == 0)
pcn_watchdog(sc);
callout_reset(&sc->pcn_stat_callout, hz, pcn_tick, sc);
return;
}
static void
pcn_intr(arg)
void *arg;
{
struct pcn_softc *sc;
struct ifnet *ifp;
u_int32_t status;
sc = arg;
ifp = sc->pcn_ifp;
PCN_LOCK(sc);
/* Suppress unwanted interrupts */
if (!(ifp->if_flags & IFF_UP)) {
pcn_stop(sc);
PCN_UNLOCK(sc);
return;
}
CSR_WRITE_4(sc, PCN_IO32_RAP, PCN_CSR_CSR);
while ((status = CSR_READ_4(sc, PCN_IO32_RDP)) & PCN_CSR_INTR) {
CSR_WRITE_4(sc, PCN_IO32_RDP, status);
if (status & PCN_CSR_RINT)
pcn_rxeof(sc);
if (status & PCN_CSR_TINT)
pcn_txeof(sc);
if (status & PCN_CSR_ERR) {
pcn_init_locked(sc);
break;
}
}
if (ifp->if_snd.ifq_head != NULL)
pcn_start_locked(ifp);
PCN_UNLOCK(sc);
return;
}
/*
* Encapsulate an mbuf chain in a descriptor by coupling the mbuf data
* pointers to the fragment pointers.
*/
static int
pcn_encap(sc, m_head, txidx)
struct pcn_softc *sc;
struct mbuf *m_head;
u_int32_t *txidx;
{
struct pcn_tx_desc *f = NULL;
struct mbuf *m;
int frag, cur, cnt = 0;
/*
* Start packing the mbufs in this chain into
* the fragment pointers. Stop when we run out
* of fragments or hit the end of the mbuf chain.
*/
m = m_head;
cur = frag = *txidx;
for (m = m_head; m != NULL; m = m->m_next) {
if (m->m_len == 0)
continue;
if ((PCN_TX_LIST_CNT - (sc->pcn_cdata.pcn_tx_cnt + cnt)) < 2)
return(ENOBUFS);
f = &sc->pcn_ldata->pcn_tx_list[frag];
f->pcn_txctl = (~(m->m_len) + 1) & PCN_TXCTL_BUFSZ;
f->pcn_txctl |= PCN_TXCTL_MBO;
f->pcn_tbaddr = vtophys(mtod(m, vm_offset_t));
if (cnt == 0)
f->pcn_txctl |= PCN_TXCTL_STP;
else
f->pcn_txctl |= PCN_TXCTL_OWN;
cur = frag;
PCN_INC(frag, PCN_TX_LIST_CNT);
cnt++;
}
if (m != NULL)
return(ENOBUFS);
sc->pcn_cdata.pcn_tx_chain[cur] = m_head;
sc->pcn_ldata->pcn_tx_list[cur].pcn_txctl |=
PCN_TXCTL_ENP|PCN_TXCTL_ADD_FCS|PCN_TXCTL_MORE_LTINT;
sc->pcn_ldata->pcn_tx_list[*txidx].pcn_txctl |= PCN_TXCTL_OWN;
sc->pcn_cdata.pcn_tx_cnt += cnt;
*txidx = frag;
return(0);
}
/*
* Main transmit routine. To avoid having to do mbuf copies, we put pointers
* to the mbuf data regions directly in the transmit lists. We also save a
* copy of the pointers since the transmit list fragment pointers are
* physical addresses.
*/
static void
pcn_start(ifp)
struct ifnet *ifp;
{
struct pcn_softc *sc;
sc = ifp->if_softc;
PCN_LOCK(sc);
pcn_start_locked(ifp);
PCN_UNLOCK(sc);
}
static void
pcn_start_locked(ifp)
struct ifnet *ifp;
{
struct pcn_softc *sc;
struct mbuf *m_head = NULL;
u_int32_t idx;
sc = ifp->if_softc;
PCN_LOCK_ASSERT(sc);
if (!sc->pcn_link)
return;
idx = sc->pcn_cdata.pcn_tx_prod;
if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
return;
while(sc->pcn_cdata.pcn_tx_chain[idx] == NULL) {
IF_DEQUEUE(&ifp->if_snd, m_head);
if (m_head == NULL)
break;
if (pcn_encap(sc, m_head, &idx)) {
IF_PREPEND(&ifp->if_snd, m_head);
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
break;
}
/*
* If there's a BPF listener, bounce a copy of this frame
* to him.
*/
BPF_MTAP(ifp, m_head);
}
/* Transmit */
sc->pcn_cdata.pcn_tx_prod = idx;
pcn_csr_write(sc, PCN_CSR_CSR, PCN_CSR_TX|PCN_CSR_INTEN);
/*
* Set a timeout in case the chip goes out to lunch.
*/
sc->pcn_timer = 5;
return;
}
static void
pcn_setfilt(ifp)
struct ifnet *ifp;
{
struct pcn_softc *sc;
sc = ifp->if_softc;
/* If we want promiscuous mode, set the allframes bit. */
if (ifp->if_flags & IFF_PROMISC) {
PCN_CSR_SETBIT(sc, PCN_CSR_MODE, PCN_MODE_PROMISC);
} else {
PCN_CSR_CLRBIT(sc, PCN_CSR_MODE, PCN_MODE_PROMISC);
}
/* Set the capture broadcast bit to capture broadcast frames. */
if (ifp->if_flags & IFF_BROADCAST) {
PCN_CSR_CLRBIT(sc, PCN_CSR_MODE, PCN_MODE_RXNOBROAD);
} else {
PCN_CSR_SETBIT(sc, PCN_CSR_MODE, PCN_MODE_RXNOBROAD);
}
return;
}
static void
pcn_init(xsc)
void *xsc;
{
struct pcn_softc *sc = xsc;
PCN_LOCK(sc);
pcn_init_locked(sc);
PCN_UNLOCK(sc);
}
static void
pcn_init_locked(sc)
struct pcn_softc *sc;
{
struct ifnet *ifp = sc->pcn_ifp;
struct mii_data *mii = NULL;
struct ifmedia_entry *ife;
PCN_LOCK_ASSERT(sc);
/*
* Cancel pending I/O and free all RX/TX buffers.
*/
pcn_stop(sc);
pcn_reset(sc);
mii = device_get_softc(sc->pcn_miibus);
ife = mii->mii_media.ifm_cur;
/* Set MAC address */
pcn_csr_write(sc, PCN_CSR_PAR0,
((u_int16_t *)IF_LLADDR(sc->pcn_ifp))[0]);
pcn_csr_write(sc, PCN_CSR_PAR1,
((u_int16_t *)IF_LLADDR(sc->pcn_ifp))[1]);
pcn_csr_write(sc, PCN_CSR_PAR2,
((u_int16_t *)IF_LLADDR(sc->pcn_ifp))[2]);
/* Init circular RX list. */
if (pcn_list_rx_init(sc) == ENOBUFS) {
if_printf(ifp, "initialization failed: no "
"memory for rx buffers\n");
pcn_stop(sc);
return;
}
/*
* Init tx descriptors.
*/
pcn_list_tx_init(sc);
/* Clear PCN_MISC_ASEL so we can set the port via PCN_CSR_MODE. */
PCN_BCR_CLRBIT(sc, PCN_BCR_MISCCFG, PCN_MISC_ASEL);
/*
* Set up the port based on the currently selected media.
* For Am79C978 we've to unconditionally set PCN_PORT_MII and
* set the PHY in PCN_BCR_PHYSEL instead.
*/
if (sc->pcn_type != Am79C978 &&
IFM_INST(ife->ifm_media) == sc->pcn_inst_10bt)
pcn_csr_write(sc, PCN_CSR_MODE, PCN_PORT_10BASET);
else
pcn_csr_write(sc, PCN_CSR_MODE, PCN_PORT_MII);
/* Set up RX filter. */
pcn_setfilt(ifp);
/*
* Load the multicast filter.
*/
pcn_setmulti(sc);
/*
* Load the addresses of the RX and TX lists.
*/
pcn_csr_write(sc, PCN_CSR_RXADDR0,
vtophys(&sc->pcn_ldata->pcn_rx_list[0]) & 0xFFFF);
pcn_csr_write(sc, PCN_CSR_RXADDR1,
(vtophys(&sc->pcn_ldata->pcn_rx_list[0]) >> 16) & 0xFFFF);
pcn_csr_write(sc, PCN_CSR_TXADDR0,
vtophys(&sc->pcn_ldata->pcn_tx_list[0]) & 0xFFFF);
pcn_csr_write(sc, PCN_CSR_TXADDR1,
(vtophys(&sc->pcn_ldata->pcn_tx_list[0]) >> 16) & 0xFFFF);
/* Set the RX and TX ring sizes. */
pcn_csr_write(sc, PCN_CSR_RXRINGLEN, (~PCN_RX_LIST_CNT) + 1);
pcn_csr_write(sc, PCN_CSR_TXRINGLEN, (~PCN_TX_LIST_CNT) + 1);
/* We're not using the initialization block. */
pcn_csr_write(sc, PCN_CSR_IAB1, 0);
/* Enable fast suspend mode. */
PCN_CSR_SETBIT(sc, PCN_CSR_EXTCTL2, PCN_EXTCTL2_FASTSPNDE);
/*
* Enable burst read and write. Also set the no underflow
* bit. This will avoid transmit underruns in certain
* conditions while still providing decent performance.
*/
PCN_BCR_SETBIT(sc, PCN_BCR_BUSCTL, PCN_BUSCTL_NOUFLOW|
PCN_BUSCTL_BREAD|PCN_BUSCTL_BWRITE);
/* Enable graceful recovery from underflow. */
PCN_CSR_SETBIT(sc, PCN_CSR_IMR, PCN_IMR_DXSUFLO);
/* Enable auto-padding of short TX frames. */
PCN_CSR_SETBIT(sc, PCN_CSR_TFEAT, PCN_TFEAT_PAD_TX);
/* Disable MII autoneg (we handle this ourselves). */
PCN_BCR_SETBIT(sc, PCN_BCR_MIICTL, PCN_MIICTL_DANAS);
if (sc->pcn_type == Am79C978)
/* XXX support other PHYs? */
pcn_bcr_write(sc, PCN_BCR_PHYSEL,
PCN_PHYSEL_PCNET|PCN_PHY_HOMEPNA);
/* Enable interrupts and start the controller running. */
pcn_csr_write(sc, PCN_CSR_CSR, PCN_CSR_INTEN|PCN_CSR_START);
mii_mediachg(mii);
ifp->if_drv_flags |= IFF_DRV_RUNNING;
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
callout_reset(&sc->pcn_stat_callout, hz, pcn_tick, sc);
return;
}
/*
* Set media options.
*/
static int
pcn_ifmedia_upd(ifp)
struct ifnet *ifp;
{
struct pcn_softc *sc;
sc = ifp->if_softc;
PCN_LOCK(sc);
/*
* At least Am79C971 with DP83840A can wedge when switching
* from the internal 10baseT PHY to the external PHY without
* issuing pcn_reset(). For setting the port in PCN_CSR_MODE
* the PCnet chip has to be powered down or stopped anyway
* and although documented otherwise it doesn't take effect
* until the next initialization.
*/
sc->pcn_link = 0;
pcn_stop(sc);
pcn_reset(sc);
pcn_init_locked(sc);
if (ifp->if_snd.ifq_head != NULL)
pcn_start_locked(ifp);
PCN_UNLOCK(sc);
return(0);
}
/*
* Report current media status.
*/
static void
pcn_ifmedia_sts(ifp, ifmr)
struct ifnet *ifp;
struct ifmediareq *ifmr;
{
struct pcn_softc *sc;
struct mii_data *mii;
sc = ifp->if_softc;
mii = device_get_softc(sc->pcn_miibus);
PCN_LOCK(sc);
mii_pollstat(mii);
ifmr->ifm_active = mii->mii_media_active;
ifmr->ifm_status = mii->mii_media_status;
PCN_UNLOCK(sc);
return;
}
static int
pcn_ioctl(ifp, command, data)
struct ifnet *ifp;
u_long command;
caddr_t data;
{
struct pcn_softc *sc = ifp->if_softc;
struct ifreq *ifr = (struct ifreq *) data;
struct mii_data *mii = NULL;
int error = 0;
switch(command) {
case SIOCSIFFLAGS:
PCN_LOCK(sc);
if (ifp->if_flags & IFF_UP) {
if (ifp->if_drv_flags & IFF_DRV_RUNNING &&
ifp->if_flags & IFF_PROMISC &&
!(sc->pcn_if_flags & IFF_PROMISC)) {
PCN_CSR_SETBIT(sc, PCN_CSR_EXTCTL1,
PCN_EXTCTL1_SPND);
pcn_setfilt(ifp);
PCN_CSR_CLRBIT(sc, PCN_CSR_EXTCTL1,
PCN_EXTCTL1_SPND);
pcn_csr_write(sc, PCN_CSR_CSR,
PCN_CSR_INTEN|PCN_CSR_START);
} else if (ifp->if_drv_flags & IFF_DRV_RUNNING &&
!(ifp->if_flags & IFF_PROMISC) &&
sc->pcn_if_flags & IFF_PROMISC) {
PCN_CSR_SETBIT(sc, PCN_CSR_EXTCTL1,
PCN_EXTCTL1_SPND);
pcn_setfilt(ifp);
PCN_CSR_CLRBIT(sc, PCN_CSR_EXTCTL1,
PCN_EXTCTL1_SPND);
pcn_csr_write(sc, PCN_CSR_CSR,
PCN_CSR_INTEN|PCN_CSR_START);
} else if (!(ifp->if_drv_flags & IFF_DRV_RUNNING))
pcn_init_locked(sc);
} else {
if (ifp->if_drv_flags & IFF_DRV_RUNNING)
pcn_stop(sc);
}
sc->pcn_if_flags = ifp->if_flags;
PCN_UNLOCK(sc);
error = 0;
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
PCN_LOCK(sc);
pcn_setmulti(sc);
PCN_UNLOCK(sc);
error = 0;
break;
case SIOCGIFMEDIA:
case SIOCSIFMEDIA:
mii = device_get_softc(sc->pcn_miibus);
error = ifmedia_ioctl(ifp, ifr, &mii->mii_media, command);
break;
default:
error = ether_ioctl(ifp, command, data);
break;
}
return(error);
}
static void
pcn_watchdog(struct pcn_softc *sc)
{
struct ifnet *ifp;
PCN_LOCK_ASSERT(sc);
ifp = sc->pcn_ifp;
ifp->if_oerrors++;
if_printf(ifp, "watchdog timeout\n");
pcn_stop(sc);
pcn_reset(sc);
pcn_init_locked(sc);
if (ifp->if_snd.ifq_head != NULL)
pcn_start_locked(ifp);
}
/*
* Stop the adapter and free any mbufs allocated to the
* RX and TX lists.
*/
static void
pcn_stop(struct pcn_softc *sc)
{
register int i;
struct ifnet *ifp;
PCN_LOCK_ASSERT(sc);
ifp = sc->pcn_ifp;
sc->pcn_timer = 0;
callout_stop(&sc->pcn_stat_callout);
/* Turn off interrupts */
PCN_CSR_CLRBIT(sc, PCN_CSR_CSR, PCN_CSR_INTEN);
/* Stop adapter */
PCN_CSR_SETBIT(sc, PCN_CSR_CSR, PCN_CSR_STOP);
sc->pcn_link = 0;
/*
* Free data in the RX lists.
*/
for (i = 0; i < PCN_RX_LIST_CNT; i++) {
if (sc->pcn_cdata.pcn_rx_chain[i] != NULL) {
m_freem(sc->pcn_cdata.pcn_rx_chain[i]);
sc->pcn_cdata.pcn_rx_chain[i] = NULL;
}
}
bzero((char *)&sc->pcn_ldata->pcn_rx_list,
sizeof(sc->pcn_ldata->pcn_rx_list));
/*
* Free the TX list buffers.
*/
for (i = 0; i < PCN_TX_LIST_CNT; i++) {
if (sc->pcn_cdata.pcn_tx_chain[i] != NULL) {
m_freem(sc->pcn_cdata.pcn_tx_chain[i]);
sc->pcn_cdata.pcn_tx_chain[i] = NULL;
}
}
bzero((char *)&sc->pcn_ldata->pcn_tx_list,
sizeof(sc->pcn_ldata->pcn_tx_list));
ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
return;
}
/*
* Stop all chip I/O so that the kernel's probe routines don't
* get confused by errant DMAs when rebooting.
*/
static int
pcn_shutdown(device_t dev)
{
struct pcn_softc *sc;
sc = device_get_softc(dev);
PCN_LOCK(sc);
pcn_reset(sc);
pcn_stop(sc);
PCN_UNLOCK(sc);
return 0;
}
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