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freebsd-skq/sys/pci/if_pcn.c
Bill Paul e0b8bc252f Add support for the AMD Am79c976 PCnet/PRO controller chip. For now 
this just involves adding the chip ID to the supported list: the PCnet/PRO
is compatible with the PCnet/FAST+ and friends and should "just work"
with this driver.

Also try to handle mbuf allocation failures in the receive handler
more gracefully.
2000-10-03 18:11:36 +00:00

1351 lines
32 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.
*
* $FreeBSD$
*/
/*
* AMD Am79c972 fast ethernet PCI NIC driver. Datatheets are available
* from http://www.amd.com.
*
* Written by Bill Paul <wpaul@osd.bsdi.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/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/bpf.h>
#include <vm/vm.h> /* for vtophys */
#include <vm/pmap.h> /* for vtophys */
#include <machine/clock.h> /* for DELAY */
#include <machine/bus_pio.h>
#include <machine/bus_memio.h>
#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 <pci/pcireg.h>
#include <pci/pcivar.h>
#define PCN_USEIOSPACE
#include <pci/if_pcnreg.h>
MODULE_DEPEND(pcn, miibus, 1, 1, 1);
/* "controller miibus0" required. See GENERIC if you get errors here. */
#include "miibus_if.h"
#ifndef lint
static const char rcsid[] =
"$FreeBSD$";
#endif
/*
* Various supported device vendors/types and their names.
*/
static 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 u_int32_t pcn_csr_read __P((struct pcn_softc *, int));
static void pcn_csr_write __P((struct pcn_softc *, int, int));
static u_int32_t pcn_bcr_read __P((struct pcn_softc *, int));
static void pcn_bcr_write __P((struct pcn_softc *, int, int));
static int pcn_probe __P((device_t));
static int pcn_attach __P((device_t));
static int pcn_detach __P((device_t));
static int pcn_newbuf __P((struct pcn_softc *, int, struct mbuf *));
static int pcn_encap __P((struct pcn_softc *,
struct mbuf *, u_int32_t *));
static void pcn_rxeof __P((struct pcn_softc *));
static void pcn_txeof __P((struct pcn_softc *));
static void pcn_intr __P((void *));
static void pcn_tick __P((void *));
static void pcn_start __P((struct ifnet *));
static int pcn_ioctl __P((struct ifnet *, u_long, caddr_t));
static void pcn_init __P((void *));
static void pcn_stop __P((struct pcn_softc *));
static void pcn_watchdog __P((struct ifnet *));
static void pcn_shutdown __P((device_t));
static int pcn_ifmedia_upd __P((struct ifnet *));
static void pcn_ifmedia_sts __P((struct ifnet *, struct ifmediareq *));
static int pcn_miibus_readreg __P((device_t, int, int));
static int pcn_miibus_writereg __P((device_t, int, int, int));
static void pcn_miibus_statchg __P((device_t));
static void pcn_setmulti __P((struct pcn_softc *));
static u_int32_t pcn_crc __P((caddr_t));
static void pcn_reset __P((struct pcn_softc *));
static int pcn_list_rx_init __P((struct pcn_softc *));
static int pcn_list_tx_init __P((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),
/* bus interface */
DEVMETHOD(bus_print_child, bus_generic_print_child),
DEVMETHOD(bus_driver_added, bus_generic_driver_added),
/* MII interface */
DEVMETHOD(miibus_readreg, pcn_miibus_readreg),
DEVMETHOD(miibus_writereg, pcn_miibus_writereg),
DEVMETHOD(miibus_statchg, pcn_miibus_statchg),
{ 0, 0 }
};
static driver_t pcn_driver = {
"pcn",
pcn_methods,
sizeof(struct pcn_softc)
};
static devclass_t pcn_devclass;
DRIVER_MODULE(if_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 void pcn_csr_write(sc, reg, val)
struct pcn_softc *sc;
int reg;
{
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 void pcn_bcr_write(sc, reg, val)
struct pcn_softc *sc;
int reg;
{
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);
if (sc->pcn_phyaddr && phy > sc->pcn_phyaddr)
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);
sc->pcn_phyaddr = 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;
}
#define DC_POLY 0xEDB88320
static u_int32_t pcn_crc(addr)
caddr_t addr;
{
u_int32_t idx, bit, data, crc;
/* Compute CRC for the address value. */
crc = 0xFFFFFFFF; /* initial value */
for (idx = 0; idx < 6; idx++) {
for (data = *addr++, bit = 0; bit < 8; bit++, data >>= 1)
crc = (crc >> 1) ^ (((crc ^ data) & 1) ? DC_POLY : 0);
}
return ((crc >> 26) & 0x3F);
}
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->arpcom.ac_if;
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 */
for (ifma = ifp->if_multiaddrs.lh_first; ifma != NULL;
ifma = ifma->ifma_link.le_next) {
if (ifma->ifma_addr->sa_family != AF_LINK)
continue;
h = pcn_crc(LLADDR((struct sockaddr_dl *)ifma->ifma_addr));
hashes[h >> 4] |= 1 << (h & 0xF);
}
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;
}
/*
* 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;
{
struct pcn_type *t;
struct pcn_softc *sc;
int rid;
u_int32_t chip_id;
t = pcn_devs;
sc = device_get_softc(dev);
while(t->pcn_name != NULL) {
if ((pci_get_vendor(dev) == t->pcn_vid) &&
(pci_get_device(dev) == t->pcn_did)) {
/*
* Temporarily map the I/O space
* so we can read the chip ID register.
*/
rid = PCN_RID;
sc->pcn_res = bus_alloc_resource(dev, PCN_RES, &rid,
0, ~0, 1, 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);
pcn_reset(sc);
chip_id = pcn_csr_read(sc, PCN_CSR_CHIPID1);
chip_id <<= 16;
chip_id |= pcn_csr_read(sc, PCN_CSR_CHIPID0);
bus_release_resource(dev, PCN_RES,
PCN_RID, sc->pcn_res);
chip_id >>= 12;
sc->pcn_type = chip_id & PART_MASK;
switch(sc->pcn_type) {
case Am79C971:
case Am79C972:
case Am79C973:
case Am79C976:
case Am79C978:
break;
default:
return(ENXIO);
break;
}
device_set_desc(dev, t->pcn_name);
return(0);
}
t++;
}
return(ENXIO);
}
/*
* Attach the interface. Allocate softc structures, do ifmedia
* setup and ethernet/BPF attach.
*/
static int pcn_attach(dev)
device_t dev;
{
int s;
u_int32_t eaddr[2];
u_int32_t command;
struct pcn_softc *sc;
struct ifnet *ifp;
int unit, error = 0, rid;
s = splimp();
sc = device_get_softc(dev);
unit = device_get_unit(dev);
/*
* Handle power management nonsense.
*/
command = pci_read_config(dev, PCN_PCI_CAPID, 4) & 0x000000FF;
if (command == 0x01) {
command = pci_read_config(dev, PCN_PCI_PWRMGMTCTRL, 4);
if (command & PCN_PSTATE_MASK) {
u_int32_t iobase, membase, irq;
/* Save important PCI config data. */
iobase = pci_read_config(dev, PCN_PCI_LOIO, 4);
membase = pci_read_config(dev, PCN_PCI_LOMEM, 4);
irq = pci_read_config(dev, PCN_PCI_INTLINE, 4);
/* Reset the power state. */
printf("pcn%d: chip is in D%d power mode "
"-- setting to D0\n", unit, command & PCN_PSTATE_MASK);
command &= 0xFFFFFFFC;
pci_write_config(dev, PCN_PCI_PWRMGMTCTRL, command, 4);
/* Restore PCI config data. */
pci_write_config(dev, PCN_PCI_LOIO, iobase, 4);
pci_write_config(dev, PCN_PCI_LOMEM, membase, 4);
pci_write_config(dev, PCN_PCI_INTLINE, irq, 4);
}
}
/*
* Map control/status registers.
*/
command = pci_read_config(dev, PCIR_COMMAND, 4);
command |= (PCIM_CMD_PORTEN|PCIM_CMD_MEMEN|PCIM_CMD_BUSMASTEREN);
pci_write_config(dev, PCIR_COMMAND, command, 4);
command = pci_read_config(dev, PCIR_COMMAND, 4);
#ifdef PCN_USEIOSPACE
if (!(command & PCIM_CMD_PORTEN)) {
printf("pcn%d: failed to enable I/O ports!\n", unit);
error = ENXIO;;
goto fail;
}
#else
if (!(command & PCIM_CMD_MEMEN)) {
printf("pcn%d: failed to enable memory mapping!\n", unit);
error = ENXIO;;
goto fail;
}
#endif
rid = PCN_RID;
sc->pcn_res = bus_alloc_resource(dev, PCN_RES, &rid,
0, ~0, 1, RF_ACTIVE);
if (sc->pcn_res == NULL) {
printf("pcn%d: couldn't map ports/memory\n", unit);
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(dev, SYS_RES_IRQ, &rid, 0, ~0, 1,
RF_SHAREABLE | RF_ACTIVE);
if (sc->pcn_irq == NULL) {
printf("pcn%d: couldn't map interrupt\n", unit);
bus_release_resource(dev, PCN_RES, PCN_RID, sc->pcn_res);
error = ENXIO;
goto fail;
}
error = bus_setup_intr(dev, sc->pcn_irq, INTR_TYPE_NET,
pcn_intr, sc, &sc->pcn_intrhand);
if (error) {
bus_release_resource(dev, SYS_RES_IRQ, 0, sc->pcn_res);
bus_release_resource(dev, PCN_RES, PCN_RID, sc->pcn_res);
printf("pcn%d: couldn't set up irq\n", unit);
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);
bcopy(eaddr, (char *)&sc->arpcom.ac_enaddr, ETHER_ADDR_LEN);
/*
* An AMD chip was detected. Inform the world.
*/
printf("pcn%d: Ethernet address: %6D\n", unit,
sc->arpcom.ac_enaddr, ":");
sc->pcn_unit = unit;
callout_handle_init(&sc->pcn_stat_ch);
sc->pcn_ldata = contigmalloc(sizeof(struct pcn_list_data), M_DEVBUF,
M_NOWAIT, 0, 0xffffffff, PAGE_SIZE, 0);
if (sc->pcn_ldata == NULL) {
printf("pcn%d: no memory for list buffers!\n", unit);
bus_teardown_intr(dev, sc->pcn_irq, sc->pcn_intrhand);
bus_release_resource(dev, SYS_RES_IRQ, 0, sc->pcn_irq);
bus_release_resource(dev, PCN_RES, PCN_RID, sc->pcn_res);
error = ENXIO;
goto fail;
}
bzero(sc->pcn_ldata, sizeof(struct pcn_list_data));
ifp = &sc->arpcom.ac_if;
ifp->if_softc = sc;
ifp->if_unit = unit;
ifp->if_name = "pcn";
ifp->if_mtu = ETHERMTU;
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_ioctl = pcn_ioctl;
ifp->if_output = ether_output;
ifp->if_start = pcn_start;
ifp->if_watchdog = pcn_watchdog;
ifp->if_init = pcn_init;
ifp->if_baudrate = 10000000;
ifp->if_snd.ifq_maxlen = PCN_TX_LIST_CNT - 1;
/*
* Do MII setup.
*/
if (mii_phy_probe(dev, &sc->pcn_miibus,
pcn_ifmedia_upd, pcn_ifmedia_sts)) {
printf("pcn%d: MII without any PHY!\n", sc->pcn_unit);
bus_teardown_intr(dev, sc->pcn_irq, sc->pcn_intrhand);
bus_release_resource(dev, SYS_RES_IRQ, 0, sc->pcn_irq);
bus_release_resource(dev, PCN_RES, PCN_RID, sc->pcn_res);
error = ENXIO;
goto fail;
}
/*
* Call MI attach routine.
*/
ether_ifattach(ifp, ETHER_BPF_SUPPORTED);
callout_handle_init(&sc->pcn_stat_ch);
fail:
splx(s);
return(error);
}
static int pcn_detach(dev)
device_t dev;
{
struct pcn_softc *sc;
struct ifnet *ifp;
int s;
s = splimp();
sc = device_get_softc(dev);
ifp = &sc->arpcom.ac_if;
pcn_reset(sc);
pcn_stop(sc);
ether_ifdetach(ifp, ETHER_BPF_SUPPORTED);
if (sc->pcn_miibus != NULL) {
bus_generic_detach(dev);
device_delete_child(dev, sc->pcn_miibus);
}
bus_teardown_intr(dev, sc->pcn_irq, sc->pcn_intrhand);
bus_release_resource(dev, SYS_RES_IRQ, 0, sc->pcn_irq);
bus_release_resource(dev, PCN_RES, PCN_RID, sc->pcn_res);
contigfree(sc->pcn_ldata, sizeof(struct pcn_list_data), M_DEVBUF);
splx(s);
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_list_data *ld;
struct pcn_ring_data *cd;
int i;
ld = sc->pcn_ldata;
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) {
printf("pcn%d: no memory for rx list "
"-- packet dropped!\n", sc->pcn_unit);
return(ENOBUFS);
}
MCLGET(m_new, M_DONTWAIT);
if (!(m_new->m_flags & M_EXT)) {
printf("pcn%d: no memory for rx list "
"-- packet dropped!\n", sc->pcn_unit);
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 ether_header *eh;
struct mbuf *m;
struct ifnet *ifp;
struct pcn_rx_desc *cur_rx;
int i;
ifp = &sc->arpcom.ac_if;
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++;
eh = mtod(m, struct ether_header *);
m->m_len = m->m_pkthdr.len =
cur_rx->pcn_rxlen - ETHER_CRC_LEN;
m->m_pkthdr.rcvif = ifp;
/* Remove header from mbuf and pass it on. */
m_adj(m, sizeof(struct ether_header));
ether_input(ifp, eh, m);
}
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->arpcom.ac_if;
/* Clear the timeout timer. */
ifp->if_timer = 0;
/*
* 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);
ifp->if_timer = 0;
}
sc->pcn_cdata.pcn_tx_cons = idx;
if (cur_tx != NULL)
ifp->if_flags &= ~IFF_OACTIVE;
return;
}
static void pcn_tick(xsc)
void *xsc;
{
struct pcn_softc *sc;
struct mii_data *mii;
struct ifnet *ifp;
int s;
s = splimp();
sc = xsc;
ifp = &sc->arpcom.ac_if;
mii = device_get_softc(sc->pcn_miibus);
mii_tick(mii);
if (sc->pcn_link & !(mii->mii_media_status & IFM_ACTIVE))
sc->pcn_link = 0;
if (!sc->pcn_link) {
mii_pollstat(mii);
if (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(ifp);
}
sc->pcn_stat_ch = timeout(pcn_tick, sc, hz);
splx(s);
return;
}
static void pcn_intr(arg)
void *arg;
{
struct pcn_softc *sc;
struct ifnet *ifp;
u_int32_t status;
sc = arg;
ifp = &sc->arpcom.ac_if;
/* Supress unwanted interrupts */
if (!(ifp->if_flags & IFF_UP)) {
pcn_stop(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(sc);
break;
}
}
if (ifp->if_snd.ifq_head != NULL)
pcn_start(ifp);
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) {
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;
struct mbuf *m_head = NULL;
u_int32_t idx;
sc = ifp->if_softc;
if (!sc->pcn_link)
return;
idx = sc->pcn_cdata.pcn_tx_prod;
if (ifp->if_flags & IFF_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_flags |= IFF_OACTIVE;
break;
}
/*
* If there's a BPF listener, bounce a copy of this frame
* to him.
*/
if (ifp->if_bpf)
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.
*/
ifp->if_timer = 5;
return;
}
static void pcn_init(xsc)
void *xsc;
{
struct pcn_softc *sc = xsc;
struct ifnet *ifp = &sc->arpcom.ac_if;
struct mii_data *mii = NULL;
int s;
s = splimp();
/*
* Cancel pending I/O and free all RX/TX buffers.
*/
pcn_stop(sc);
pcn_reset(sc);
mii = device_get_softc(sc->pcn_miibus);
/* Set MAC address */
pcn_csr_write(sc, PCN_CSR_PAR0,
((u_int16_t *)sc->arpcom.ac_enaddr)[0]);
pcn_csr_write(sc, PCN_CSR_PAR1,
((u_int16_t *)sc->arpcom.ac_enaddr)[1]);
pcn_csr_write(sc, PCN_CSR_PAR2,
((u_int16_t *)sc->arpcom.ac_enaddr)[2]);
/* Init circular RX list. */
if (pcn_list_rx_init(sc) == ENOBUFS) {
printf("pcn%d: initialization failed: no "
"memory for rx buffers\n", sc->pcn_unit);
pcn_stop(sc);
(void)splx(s);
return;
}
/*
* Init tx descriptors.
*/
pcn_list_tx_init(sc);
/* Set up the mode register. */
pcn_csr_write(sc, PCN_CSR_MODE, PCN_PORT_MII);
/* 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);
}
/*
* 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_CLRBIT(sc, PCN_BCR_MIICTL, PCN_MIICTL_DANAS);
if (sc->pcn_type == Am79C978)
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_flags |= IFF_RUNNING;
ifp->if_flags &= ~IFF_OACTIVE;
(void)splx(s);
sc->pcn_stat_ch = timeout(pcn_tick, sc, hz);
return;
}
/*
* Set media options.
*/
static int pcn_ifmedia_upd(ifp)
struct ifnet *ifp;
{
struct pcn_softc *sc;
struct mii_data *mii;
sc = ifp->if_softc;
mii = device_get_softc(sc->pcn_miibus);
sc->pcn_link = 0;
if (mii->mii_instance) {
struct mii_softc *miisc;
for (miisc = LIST_FIRST(&mii->mii_phys); miisc != NULL;
miisc = LIST_NEXT(miisc, mii_list))
mii_phy_reset(miisc);
}
mii_mediachg(mii);
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);
mii_pollstat(mii);
ifmr->ifm_active = mii->mii_media_active;
ifmr->ifm_status = mii->mii_media_status;
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 s, error = 0;
s = splimp();
switch(command) {
case SIOCSIFADDR:
case SIOCGIFADDR:
case SIOCSIFMTU:
error = ether_ioctl(ifp, command, data);
break;
case SIOCSIFFLAGS:
if (ifp->if_flags & IFF_UP) {
if (ifp->if_flags & IFF_RUNNING &&
ifp->if_flags & IFF_PROMISC &&
!(sc->pcn_if_flags & IFF_PROMISC)) {
PCN_CSR_SETBIT(sc, PCN_CSR_EXTCTL1,
PCN_EXTCTL1_SPND);
PCN_CSR_SETBIT(sc, PCN_CSR_MODE,
PCN_MODE_PROMISC);
PCN_CSR_CLRBIT(sc, PCN_CSR_EXTCTL1,
PCN_EXTCTL1_SPND);
} else if (ifp->if_flags & IFF_RUNNING &&
!(ifp->if_flags & IFF_PROMISC) &&
sc->pcn_if_flags & IFF_PROMISC) {
PCN_CSR_SETBIT(sc, PCN_CSR_EXTCTL1,
PCN_EXTCTL1_SPND);
PCN_CSR_CLRBIT(sc, PCN_CSR_MODE,
PCN_MODE_PROMISC);
PCN_CSR_CLRBIT(sc, PCN_CSR_EXTCTL1,
PCN_EXTCTL1_SPND);
} else if (!(ifp->if_flags & IFF_RUNNING))
pcn_init(sc);
} else {
if (ifp->if_flags & IFF_RUNNING)
pcn_stop(sc);
}
sc->pcn_if_flags = ifp->if_flags;
error = 0;
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
pcn_setmulti(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 = EINVAL;
break;
}
(void)splx(s);
return(error);
}
static void pcn_watchdog(ifp)
struct ifnet *ifp;
{
struct pcn_softc *sc;
sc = ifp->if_softc;
ifp->if_oerrors++;
printf("pcn%d: watchdog timeout\n", sc->pcn_unit);
pcn_stop(sc);
pcn_reset(sc);
pcn_init(sc);
if (ifp->if_snd.ifq_head != NULL)
pcn_start(ifp);
return;
}
/*
* Stop the adapter and free any mbufs allocated to the
* RX and TX lists.
*/
static void pcn_stop(sc)
struct pcn_softc *sc;
{
register int i;
struct ifnet *ifp;
ifp = &sc->arpcom.ac_if;
ifp->if_timer = 0;
untimeout(pcn_tick, sc, sc->pcn_stat_ch);
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_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 pcn_shutdown(dev)
device_t dev;
{
struct pcn_softc *sc;
sc = device_get_softc(dev);
pcn_reset(sc);
pcn_stop(sc);
return;
}
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