/* $NetBSD: smc83c170.c,v 1.21 1999/08/27 19:13:00 thorpej Exp $ */ /*- * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, * NASA Ames Research Center. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Device driver for the Standard Microsystems Corp. 83C170 * Ethernet PCI Integrated Controller (EPIC/100). */ #include "opt_inet.h" #include "opt_ns.h" #include "bpfilter.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #if NBPFILTER > 0 #include #endif #ifdef INET #include #include #endif #ifdef NS #include #include #endif #include #include #include #include #include void epic_start __P((struct ifnet *)); void epic_watchdog __P((struct ifnet *)); int epic_ioctl __P((struct ifnet *, u_long, caddr_t)); void epic_shutdown __P((void *)); void epic_reset __P((struct epic_softc *)); int epic_init __P((struct epic_softc *)); void epic_rxdrain __P((struct epic_softc *)); void epic_stop __P((struct epic_softc *, int)); int epic_add_rxbuf __P((struct epic_softc *, int)); void epic_read_eeprom __P((struct epic_softc *, int, int, u_int16_t *)); void epic_set_mchash __P((struct epic_softc *)); void epic_fixup_clock_source __P((struct epic_softc *)); int epic_mii_read __P((struct device *, int, int)); void epic_mii_write __P((struct device *, int, int, int)); int epic_mii_wait __P((struct epic_softc *, u_int32_t)); void epic_tick __P((void *)); void epic_statchg __P((struct device *)); int epic_mediachange __P((struct ifnet *)); void epic_mediastatus __P((struct ifnet *, struct ifmediareq *)); #define INTMASK (INTSTAT_FATAL_INT | INTSTAT_TXU | \ INTSTAT_TXC | INTSTAT_RXE | INTSTAT_RQE | INTSTAT_RCC) int epic_copy_small = 0; /* * Attach an EPIC interface to the system. */ void epic_attach(sc) struct epic_softc *sc; { bus_space_tag_t st = sc->sc_st; bus_space_handle_t sh = sc->sc_sh; struct ifnet *ifp = &sc->sc_ethercom.ec_if; int i, rseg, error; bus_dma_segment_t seg; u_int8_t enaddr[ETHER_ADDR_LEN], devname[12 + 1]; u_int16_t myea[ETHER_ADDR_LEN / 2], mydevname[6]; /* * Allocate the control data structures, and create and load the * DMA map for it. */ if ((error = bus_dmamem_alloc(sc->sc_dmat, sizeof(struct epic_control_data), NBPG, 0, &seg, 1, &rseg, BUS_DMA_NOWAIT)) != 0) { printf("%s: unable to allocate control data, error = %d\n", sc->sc_dev.dv_xname, error); goto fail_0; } if ((error = bus_dmamem_map(sc->sc_dmat, &seg, rseg, sizeof(struct epic_control_data), (caddr_t *)&sc->sc_control_data, BUS_DMA_NOWAIT|BUS_DMA_COHERENT)) != 0) { printf("%s: unable to map control data, error = %d\n", sc->sc_dev.dv_xname, error); goto fail_1; } if ((error = bus_dmamap_create(sc->sc_dmat, sizeof(struct epic_control_data), 1, sizeof(struct epic_control_data), 0, BUS_DMA_NOWAIT, &sc->sc_cddmamap)) != 0) { printf("%s: unable to create control data DMA map, " "error = %d\n", sc->sc_dev.dv_xname, error); goto fail_2; } if ((error = bus_dmamap_load(sc->sc_dmat, sc->sc_cddmamap, sc->sc_control_data, sizeof(struct epic_control_data), NULL, BUS_DMA_NOWAIT)) != 0) { printf("%s: unable to load control data DMA map, error = %d\n", sc->sc_dev.dv_xname, error); goto fail_3; } /* * Create the transmit buffer DMA maps. */ for (i = 0; i < EPIC_NTXDESC; i++) { if ((error = bus_dmamap_create(sc->sc_dmat, MCLBYTES, EPIC_NFRAGS, MCLBYTES, 0, BUS_DMA_NOWAIT, &EPIC_DSTX(sc, i)->ds_dmamap)) != 0) { printf("%s: unable to create tx DMA map %d, " "error = %d\n", sc->sc_dev.dv_xname, i, error); goto fail_4; } } /* * Create the recieve buffer DMA maps. */ for (i = 0; i < EPIC_NRXDESC; i++) { if ((error = bus_dmamap_create(sc->sc_dmat, MCLBYTES, 1, MCLBYTES, 0, BUS_DMA_NOWAIT, &EPIC_DSRX(sc, i)->ds_dmamap)) != 0) { printf("%s: unable to create rx DMA map %d, " "error = %d\n", sc->sc_dev.dv_xname, i, error); goto fail_5; } EPIC_DSRX(sc, i)->ds_mbuf = NULL; } /* * Bring the chip out of low-power mode and reset it to a known state. */ bus_space_write_4(st, sh, EPIC_GENCTL, 0); epic_reset(sc); /* * Read the Ethernet address from the EEPROM. */ epic_read_eeprom(sc, 0, (sizeof(myea) / sizeof(myea[0])), myea); bcopy(myea, enaddr, sizeof(myea)); /* * ...and the device name. */ epic_read_eeprom(sc, 0x2c, (sizeof(mydevname) / sizeof(mydevname[0])), mydevname); bcopy(mydevname, devname, sizeof(mydevname)); devname[sizeof(mydevname)] = '\0'; for (i = sizeof(mydevname) - 1; i >= 0; i--) { if (devname[i] == ' ') devname[i] = '\0'; else break; } printf("%s: %s, Ethernet address %s\n", sc->sc_dev.dv_xname, devname, ether_sprintf(enaddr)); /* * Initialize our media structures and probe the MII. */ sc->sc_mii.mii_ifp = ifp; sc->sc_mii.mii_readreg = epic_mii_read; sc->sc_mii.mii_writereg = epic_mii_write; sc->sc_mii.mii_statchg = epic_statchg; ifmedia_init(&sc->sc_mii.mii_media, 0, epic_mediachange, epic_mediastatus); mii_phy_probe(&sc->sc_dev, &sc->sc_mii, 0xffffffff); if (LIST_FIRST(&sc->sc_mii.mii_phys) == NULL) { ifmedia_add(&sc->sc_mii.mii_media, IFM_ETHER|IFM_NONE, 0, NULL); ifmedia_set(&sc->sc_mii.mii_media, IFM_ETHER|IFM_NONE); } else ifmedia_set(&sc->sc_mii.mii_media, IFM_ETHER|IFM_AUTO); ifp = &sc->sc_ethercom.ec_if; strcpy(ifp->if_xname, sc->sc_dev.dv_xname); ifp->if_softc = sc; ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; ifp->if_ioctl = epic_ioctl; ifp->if_start = epic_start; ifp->if_watchdog = epic_watchdog; /* * Attach the interface. */ if_attach(ifp); ether_ifattach(ifp, enaddr); #if NBPFILTER > 0 bpfattach(&sc->sc_ethercom.ec_if.if_bpf, ifp, DLT_EN10MB, sizeof(struct ether_header)); #endif /* * Make sure the interface is shutdown during reboot. */ sc->sc_sdhook = shutdownhook_establish(epic_shutdown, sc); if (sc->sc_sdhook == NULL) printf("%s: WARNING: unable to establish shutdown hook\n", sc->sc_dev.dv_xname); return; /* * Free any resources we've allocated during the failed attach * attempt. Do this in reverse order and fall through. */ fail_5: for (i = 0; i < EPIC_NRXDESC; i++) { if (EPIC_DSRX(sc, i)->ds_dmamap != NULL) bus_dmamap_destroy(sc->sc_dmat, EPIC_DSRX(sc, i)->ds_dmamap); } fail_4: for (i = 0; i < EPIC_NTXDESC; i++) { if (EPIC_DSTX(sc, i)->ds_dmamap != NULL) bus_dmamap_destroy(sc->sc_dmat, EPIC_DSTX(sc, i)->ds_dmamap); } bus_dmamap_unload(sc->sc_dmat, sc->sc_cddmamap); fail_3: bus_dmamap_destroy(sc->sc_dmat, sc->sc_cddmamap); fail_2: bus_dmamem_unmap(sc->sc_dmat, (caddr_t)sc->sc_control_data, sizeof(struct epic_control_data)); fail_1: bus_dmamem_free(sc->sc_dmat, &seg, rseg); fail_0: return; } /* * Shutdown hook. Make sure the interface is stopped at reboot. */ void epic_shutdown(arg) void *arg; { struct epic_softc *sc = arg; epic_stop(sc, 1); } /* * Start packet transmission on the interface. * [ifnet interface function] */ void epic_start(ifp) struct ifnet *ifp; { struct epic_softc *sc = ifp->if_softc; struct mbuf *m0, *m; struct epic_txdesc *txd; struct epic_descsoft *ds; struct epic_fraglist *fr; bus_dmamap_t dmamap; int error, firsttx, nexttx, opending, seg; /* * Remember the previous txpending and the first transmit * descriptor we use. */ opending = sc->sc_txpending; firsttx = EPIC_NEXTTX(sc->sc_txlast); /* * Loop through the send queue, setting up transmit descriptors * until we drain the queue, or use up all available transmit * descriptors. */ while (sc->sc_txpending < EPIC_NTXDESC) { /* * Grab a packet off the queue. */ IF_DEQUEUE(&ifp->if_snd, m0); if (m0 == NULL) break; /* * Get the last and next available transmit descriptor. */ nexttx = EPIC_NEXTTX(sc->sc_txlast); txd = EPIC_CDTX(sc, nexttx); fr = EPIC_CDFL(sc, nexttx); ds = EPIC_DSTX(sc, nexttx); dmamap = ds->ds_dmamap; /* * Load the DMA map. If this fails, the packet either * didn't fit in the alloted number of frags, or we were * short on resources. In this case, we'll copy and try * again. */ if (bus_dmamap_load_mbuf(sc->sc_dmat, dmamap, m0, BUS_DMA_NOWAIT) != 0) { MGETHDR(m, M_DONTWAIT, MT_DATA); if (m == NULL) { printf("%s: unable to allocate Tx mbuf\n", sc->sc_dev.dv_xname); IF_PREPEND(&ifp->if_snd, m0); break; } if (m0->m_pkthdr.len > MHLEN) { MCLGET(m, M_DONTWAIT); if ((m->m_flags & M_EXT) == 0) { printf("%s: unable to allocate Tx " "cluster\n", sc->sc_dev.dv_xname); m_freem(m); IF_PREPEND(&ifp->if_snd, m0); break; } } m_copydata(m0, 0, m0->m_pkthdr.len, mtod(m, caddr_t)); m->m_pkthdr.len = m->m_len = m0->m_pkthdr.len; m_freem(m0); m0 = m; error = bus_dmamap_load_mbuf(sc->sc_dmat, dmamap, m0, BUS_DMA_NOWAIT); if (error) { printf("%s: unable to load Tx buffer, " "error = %d\n", sc->sc_dev.dv_xname, error); IF_PREPEND(&ifp->if_snd, m0); break; } } /* Initialize the fraglist. */ fr->ef_nfrags = dmamap->dm_nsegs; for (seg = 0; seg < dmamap->dm_nsegs; seg++) { fr->ef_frags[seg].ef_addr = dmamap->dm_segs[seg].ds_addr; fr->ef_frags[seg].ef_length = dmamap->dm_segs[seg].ds_len; } EPIC_CDFLSYNC(sc, nexttx, BUS_DMASYNC_PREWRITE); /* Sync the DMA map. */ bus_dmamap_sync(sc->sc_dmat, dmamap, 0, dmamap->dm_mapsize, BUS_DMASYNC_PREWRITE); /* * Store a pointer to the packet so we can free it later. */ ds->ds_mbuf = m0; /* * Fill in the transmit descriptor. The EPIC doesn't * auto-pad, so we have to do this ourselves. */ txd->et_control = ET_TXCTL_LASTDESC | ET_TXCTL_FRAGLIST; txd->et_txlength = max(m0->m_pkthdr.len, ETHER_MIN_LEN - ETHER_CRC_LEN); /* * If this is the first descriptor we're enqueueing, * don't give it to the EPIC yet. That could cause * a race condition. We'll do it below. */ if (nexttx == firsttx) txd->et_txstatus = 0; else txd->et_txstatus = ET_TXSTAT_OWNER; EPIC_CDTXSYNC(sc, nexttx, BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE); /* Advance the tx pointer. */ sc->sc_txpending++; sc->sc_txlast = nexttx; #if NBPFILTER > 0 /* * Pass the packet to any BPF listeners. */ if (ifp->if_bpf) bpf_mtap(ifp->if_bpf, m0); #endif } if (sc->sc_txpending == EPIC_NTXDESC) { /* No more slots left; notify upper layer. */ ifp->if_flags |= IFF_OACTIVE; } if (sc->sc_txpending != opending) { /* * We enqueued packets. If the transmitter was idle, * reset the txdirty pointer. */ if (opending == 0) sc->sc_txdirty = firsttx; /* * Cause a transmit interrupt to happen on the * last packet we enqueued. */ EPIC_CDTX(sc, sc->sc_txlast)->et_control |= ET_TXCTL_IAF; EPIC_CDTXSYNC(sc, sc->sc_txlast, BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE); /* * The entire packet chain is set up. Give the * first descriptor to the EPIC now. */ EPIC_CDTX(sc, firsttx)->et_txstatus = ET_TXSTAT_OWNER; EPIC_CDTXSYNC(sc, firsttx, BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE); /* Start the transmitter. */ bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_COMMAND, COMMAND_TXQUEUED); /* Set a watchdog timer in case the chip flakes out. */ ifp->if_timer = 5; } } /* * Watchdog timer handler. * [ifnet interface function] */ void epic_watchdog(ifp) struct ifnet *ifp; { struct epic_softc *sc = ifp->if_softc; printf("%s: device timeout\n", sc->sc_dev.dv_xname); ifp->if_oerrors++; (void) epic_init(sc); } /* * Handle control requests from the operator. * [ifnet interface function] */ int epic_ioctl(ifp, cmd, data) struct ifnet *ifp; u_long cmd; caddr_t data; { struct epic_softc *sc = ifp->if_softc; struct ifreq *ifr = (struct ifreq *)data; struct ifaddr *ifa = (struct ifaddr *)data; int s, error = 0; s = splnet(); switch (cmd) { case SIOCSIFADDR: ifp->if_flags |= IFF_UP; switch (ifa->ifa_addr->sa_family) { #ifdef INET case AF_INET: if ((error = epic_init(sc)) != 0) break; arp_ifinit(ifp, ifa); break; #endif /* INET */ #ifdef NS case AF_NS: { struct ns_addr *ina = &IA_SNS(ifa)->sns_addr; if (ns_nullhost(*ina)) ina->x_host = *(union ns_host *) LLADDR(ifp->if_sadl); else bcopy(ina->x_host.c_host, LLADDR(ifp->if_sadl), ifp->if_addrlen); /* Set new address. */ error = epic_init(sc); break; } #endif /* NS */ default: error = epic_init(sc); break; } break; case SIOCSIFMTU: if (ifr->ifr_mtu > ETHERMTU) error = EINVAL; else ifp->if_mtu = ifr->ifr_mtu; break; case SIOCSIFFLAGS: if ((ifp->if_flags & IFF_UP) == 0 && (ifp->if_flags & IFF_RUNNING) != 0) { /* * If interface is marked down and it is running, then * stop it. */ epic_stop(sc, 1); } else if ((ifp->if_flags & IFF_UP) != 0 && (ifp->if_flags & IFF_RUNNING) == 0) { /* * If interfase it marked up and it is stopped, then * start it. */ error = epic_init(sc); } else if ((ifp->if_flags & IFF_UP) != 0) { /* * Reset the interface to pick up changes in any other * flags that affect the hardware state. */ error = epic_init(sc); } break; case SIOCADDMULTI: case SIOCDELMULTI: error = (cmd == SIOCADDMULTI) ? ether_addmulti(ifr, &sc->sc_ethercom) : ether_delmulti(ifr, &sc->sc_ethercom); if (error == ENETRESET) { /* * Multicast list has changed; set the hardware filter * accordingly. Update our idea of the current media; * epic_set_mchash() needs to know what it is. */ mii_pollstat(&sc->sc_mii); epic_set_mchash(sc); error = 0; } break; case SIOCSIFMEDIA: case SIOCGIFMEDIA: error = ifmedia_ioctl(ifp, ifr, &sc->sc_mii.mii_media, cmd); break; default: error = EINVAL; break; } splx(s); return (error); } /* * Interrupt handler. */ int epic_intr(arg) void *arg; { struct epic_softc *sc = arg; struct ifnet *ifp = &sc->sc_ethercom.ec_if; struct ether_header *eh; struct epic_rxdesc *rxd; struct epic_txdesc *txd; struct epic_descsoft *ds; struct mbuf *m; u_int32_t intstat; int i, len, claimed = 0; top: /* * Get the interrupt status from the EPIC. */ intstat = bus_space_read_4(sc->sc_st, sc->sc_sh, EPIC_INTSTAT); if ((intstat & INTSTAT_INT_ACTV) == 0) return (claimed); claimed = 1; /* * Acknowledge the interrupt. */ bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_INTSTAT, intstat & INTMASK); /* * Check for receive interrupts. */ if (intstat & (INTSTAT_RCC | INTSTAT_RXE | INTSTAT_RQE)) { for (i = sc->sc_rxptr;; i = EPIC_NEXTRX(i)) { rxd = EPIC_CDRX(sc, i); ds = EPIC_DSRX(sc, i); EPIC_CDRXSYNC(sc, i, BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE); if (rxd->er_rxstatus & ER_RXSTAT_OWNER) { /* * We have processed all of the * receive buffers. */ break; } /* * Make sure the packet arrived intact. If an error * occurred, update stats and reset the descriptor. * The buffer will be reused the next time the * descriptor comes up in the ring. */ if ((rxd->er_rxstatus & ER_RXSTAT_PKTINTACT) == 0) { if (rxd->er_rxstatus & ER_RXSTAT_CRCERROR) printf("%s: CRC error\n", sc->sc_dev.dv_xname); if (rxd->er_rxstatus & ER_RXSTAT_ALIGNERROR) printf("%s: alignment error\n", sc->sc_dev.dv_xname); ifp->if_ierrors++; EPIC_INIT_RXDESC(sc, i); continue; } bus_dmamap_sync(sc->sc_dmat, ds->ds_dmamap, 0, ds->ds_dmamap->dm_mapsize, BUS_DMASYNC_POSTREAD); /* * The EPIC includes the CRC with every packet; * trim it. */ len = rxd->er_rxlength - ETHER_CRC_LEN; if (len < sizeof(struct ether_header)) { /* * Runt packet; drop it now. */ ifp->if_ierrors++; EPIC_INIT_RXDESC(sc, i); bus_dmamap_sync(sc->sc_dmat, ds->ds_dmamap, 0, ds->ds_dmamap->dm_mapsize, BUS_DMASYNC_PREREAD); continue; } /* * If the packet is small enough to fit in a * single header mbuf, allocate one and copy * the data into it. This greatly reduces * memory consumption when we receive lots * of small packets. * * Otherwise, we add a new buffer to the receive * chain. If this fails, we drop the packet and * recycle the old buffer. */ if (epic_copy_small != 0 && len <= MHLEN) { MGETHDR(m, M_DONTWAIT, MT_DATA); if (m == NULL) goto dropit; memcpy(mtod(m, caddr_t), mtod(ds->ds_mbuf, caddr_t), len); EPIC_INIT_RXDESC(sc, i); bus_dmamap_sync(sc->sc_dmat, ds->ds_dmamap, 0, ds->ds_dmamap->dm_mapsize, BUS_DMASYNC_PREREAD); } else { m = ds->ds_mbuf; if (epic_add_rxbuf(sc, i) != 0) { dropit: ifp->if_ierrors++; EPIC_INIT_RXDESC(sc, i); bus_dmamap_sync(sc->sc_dmat, ds->ds_dmamap, 0, ds->ds_dmamap->dm_mapsize, BUS_DMASYNC_PREREAD); continue; } } m->m_pkthdr.rcvif = ifp; m->m_pkthdr.len = m->m_len = len; eh = mtod(m, struct ether_header *); #if NBPFILTER > 0 /* * Pass this up to any BPF listeners, but only * pass it up the stack if its for us. */ if (ifp->if_bpf) { bpf_mtap(ifp->if_bpf, m); if ((ifp->if_flags & IFF_PROMISC) != 0 && bcmp(LLADDR(ifp->if_sadl), eh->ether_dhost, ETHER_ADDR_LEN) != 0 && (rxd->er_rxstatus & (ER_RXSTAT_BCAST|ER_RXSTAT_MCAST)) == 0) { m_freem(m); continue; } } #endif /* NPBFILTER > 0 */ /* Pass it on. */ (*ifp->if_input)(ifp, m); ifp->if_ipackets++; } /* Update the recieve pointer. */ sc->sc_rxptr = i; /* * Check for receive queue underflow. */ if (intstat & INTSTAT_RQE) { printf("%s: receiver queue empty\n", sc->sc_dev.dv_xname); /* * Ring is already built; just restart the * receiver. */ bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_PRCDAR, EPIC_CDRXADDR(sc, sc->sc_rxptr)); bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_COMMAND, COMMAND_RXQUEUED | COMMAND_START_RX); } } /* * Check for transmission complete interrupts. */ if (intstat & (INTSTAT_TXC | INTSTAT_TXU)) { ifp->if_flags &= ~IFF_OACTIVE; for (i = sc->sc_txdirty; sc->sc_txpending != 0; i = EPIC_NEXTTX(i), sc->sc_txpending--) { txd = EPIC_CDTX(sc, i); ds = EPIC_DSTX(sc, i); EPIC_CDTXSYNC(sc, i, BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE); if (txd->et_txstatus & ET_TXSTAT_OWNER) break; EPIC_CDFLSYNC(sc, i, BUS_DMASYNC_POSTWRITE); bus_dmamap_sync(sc->sc_dmat, ds->ds_dmamap, 0, ds->ds_dmamap->dm_mapsize, BUS_DMASYNC_POSTWRITE); bus_dmamap_unload(sc->sc_dmat, ds->ds_dmamap); m_freem(ds->ds_mbuf); ds->ds_mbuf = NULL; /* * Check for errors and collisions. */ if ((txd->et_txstatus & ET_TXSTAT_PACKETTX) == 0) ifp->if_oerrors++; else ifp->if_opackets++; ifp->if_collisions += TXSTAT_COLLISIONS(txd->et_txstatus); if (txd->et_txstatus & ET_TXSTAT_CARSENSELOST) printf("%s: lost carrier\n", sc->sc_dev.dv_xname); } /* Update the dirty transmit buffer pointer. */ sc->sc_txdirty = i; /* * Cancel the watchdog timer if there are no pending * transmissions. */ if (sc->sc_txpending == 0) ifp->if_timer = 0; /* * Kick the transmitter after a DMA underrun. */ if (intstat & INTSTAT_TXU) { printf("%s: transmit underrun\n", sc->sc_dev.dv_xname); bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_COMMAND, COMMAND_TXUGO); if (sc->sc_txpending) bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_COMMAND, COMMAND_TXQUEUED); } /* * Try to get more packets going. */ epic_start(ifp); } /* * Check for fatal interrupts. */ if (intstat & INTSTAT_FATAL_INT) { if (intstat & INTSTAT_PTA) printf("%s: PCI target abort error\n", sc->sc_dev.dv_xname); else if (intstat & INTSTAT_PMA) printf("%s: PCI master abort error\n", sc->sc_dev.dv_xname); else if (intstat & INTSTAT_APE) printf("%s: PCI address parity error\n", sc->sc_dev.dv_xname); else if (intstat & INTSTAT_DPE) printf("%s: PCI data parity error\n", sc->sc_dev.dv_xname); else printf("%s: unknown fatal error\n", sc->sc_dev.dv_xname); (void) epic_init(sc); } /* * Check for more interrupts. */ goto top; } /* * One second timer, used to tick the MII. */ void epic_tick(arg) void *arg; { struct epic_softc *sc = arg; int s; s = splnet(); mii_tick(&sc->sc_mii); splx(s); timeout(epic_tick, sc, hz); } /* * Fixup the clock source on the EPIC. */ void epic_fixup_clock_source(sc) struct epic_softc *sc; { int i; /* * According to SMC Application Note 7-15, the EPIC's clock * source is incorrect following a reset. This manifests itself * as failure to recognize when host software has written to * a register on the EPIC. The appnote recommends issuing at * least 16 consecutive writes to the CLOCK TEST bit to correctly * configure the clock source. */ for (i = 0; i < 16; i++) bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_TEST, TEST_CLOCKTEST); } /* * Perform a soft reset on the EPIC. */ void epic_reset(sc) struct epic_softc *sc; { epic_fixup_clock_source(sc); bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_GENCTL, 0); delay(100); bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_GENCTL, GENCTL_SOFTRESET); delay(100); epic_fixup_clock_source(sc); } /* * Initialize the interface. Must be called at splnet(). */ int epic_init(sc) struct epic_softc *sc; { bus_space_tag_t st = sc->sc_st; bus_space_handle_t sh = sc->sc_sh; struct ifnet *ifp = &sc->sc_ethercom.ec_if; u_int8_t *enaddr = LLADDR(ifp->if_sadl); struct epic_txdesc *txd; struct epic_descsoft *ds; u_int32_t genctl, reg0; int i, error = 0; /* * Cancel any pending I/O. */ epic_stop(sc, 0); /* * Reset the EPIC to a known state. */ epic_reset(sc); /* * Magical mystery initialization. */ bus_space_write_4(st, sh, EPIC_TXTEST, 0); /* * Initialize the EPIC genctl register: * * - 64 byte receive FIFO threshold * - automatic advance to next receive frame */ genctl = GENCTL_RX_FIFO_THRESH0 | GENCTL_ONECOPY; #if BYTE_ORDER == BIG_ENDIAN genctl |= GENCTL_BIG_ENDIAN; #endif bus_space_write_4(st, sh, EPIC_GENCTL, genctl); /* * Reset the MII bus and PHY. */ reg0 = bus_space_read_4(st, sh, EPIC_NVCTL); bus_space_write_4(st, sh, EPIC_NVCTL, reg0 | NVCTL_GPIO1 | NVCTL_GPOE1); bus_space_write_4(st, sh, EPIC_MIICFG, MIICFG_ENASER); bus_space_write_4(st, sh, EPIC_GENCTL, genctl | GENCTL_RESET_PHY); delay(100); bus_space_write_4(st, sh, EPIC_GENCTL, genctl); delay(100); bus_space_write_4(st, sh, EPIC_NVCTL, reg0); /* * Initialize Ethernet address. */ reg0 = enaddr[1] << 8 | enaddr[0]; bus_space_write_4(st, sh, EPIC_LAN0, reg0); reg0 = enaddr[3] << 8 | enaddr[2]; bus_space_write_4(st, sh, EPIC_LAN1, reg0); reg0 = enaddr[5] << 8 | enaddr[4]; bus_space_write_4(st, sh, EPIC_LAN2, reg0); /* * Initialize receive control. Remember the external buffer * size setting. */ reg0 = bus_space_read_4(st, sh, EPIC_RXCON) & (RXCON_EXTBUFSIZESEL1 | RXCON_EXTBUFSIZESEL0); reg0 |= (RXCON_RXMULTICAST | RXCON_RXBROADCAST); if (ifp->if_flags & IFF_PROMISC) reg0 |= RXCON_PROMISCMODE; bus_space_write_4(st, sh, EPIC_RXCON, reg0); /* Set the current media. */ mii_mediachg(&sc->sc_mii); /* Set up the multicast hash table. */ epic_set_mchash(sc); /* * Initialize the transmit descriptor ring. txlast is initialized * to the end of the list so that it will wrap around to the first * descriptor when the first packet is transmitted. */ for (i = 0; i < EPIC_NTXDESC; i++) { txd = EPIC_CDTX(sc, i); memset(txd, 0, sizeof(struct epic_txdesc)); txd->et_bufaddr = EPIC_CDFLADDR(sc, i); txd->et_nextdesc = EPIC_CDTXADDR(sc, EPIC_NEXTTX(i)); EPIC_CDTXSYNC(sc, i, BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE); } sc->sc_txpending = 0; sc->sc_txdirty = 0; sc->sc_txlast = EPIC_NTXDESC - 1; /* * Initialize the receive descriptor ring. */ for (i = 0; i < EPIC_NRXDESC; i++) { ds = EPIC_DSRX(sc, i); if (ds->ds_mbuf == NULL) { if ((error = epic_add_rxbuf(sc, i)) != 0) { printf("%s: unable to allocate or map rx " "buffer %d error = %d\n", sc->sc_dev.dv_xname, i, error); /* * XXX Should attempt to run with fewer receive * XXX buffers instead of just failing. */ epic_rxdrain(sc); goto out; } } } sc->sc_rxptr = 0; /* * Initialize the interrupt mask and enable interrupts. */ bus_space_write_4(st, sh, EPIC_INTMASK, INTMASK); bus_space_write_4(st, sh, EPIC_GENCTL, genctl | GENCTL_INTENA); /* * Give the transmit and receive rings to the EPIC. */ bus_space_write_4(st, sh, EPIC_PTCDAR, EPIC_CDTXADDR(sc, EPIC_NEXTTX(sc->sc_txlast))); bus_space_write_4(st, sh, EPIC_PRCDAR, EPIC_CDRXADDR(sc, sc->sc_rxptr)); /* * Set the EPIC in motion. */ bus_space_write_4(st, sh, EPIC_COMMAND, COMMAND_RXQUEUED | COMMAND_START_RX); /* * ...all done! */ ifp->if_flags |= IFF_RUNNING; ifp->if_flags &= ~IFF_OACTIVE; /* * Start the one second clock. */ timeout(epic_tick, sc, hz); /* * Attempt to start output on the interface. */ epic_start(ifp); out: if (error) printf("%s: interface not running\n", sc->sc_dev.dv_xname); return (error); } /* * Drain the receive queue. */ void epic_rxdrain(sc) struct epic_softc *sc; { struct epic_descsoft *ds; int i; for (i = 0; i < EPIC_NRXDESC; i++) { ds = EPIC_DSRX(sc, i); if (ds->ds_mbuf != NULL) { bus_dmamap_unload(sc->sc_dmat, ds->ds_dmamap); m_freem(ds->ds_mbuf); ds->ds_mbuf = NULL; } } } /* * Stop transmission on the interface. */ void epic_stop(sc, drain) struct epic_softc *sc; int drain; { bus_space_tag_t st = sc->sc_st; bus_space_handle_t sh = sc->sc_sh; struct ifnet *ifp = &sc->sc_ethercom.ec_if; struct epic_descsoft *ds; u_int32_t reg; int i; /* * Stop the one second clock. */ untimeout(epic_tick, sc); /* Paranoia... */ epic_fixup_clock_source(sc); /* * Disable interrupts. */ reg = bus_space_read_4(st, sh, EPIC_GENCTL); bus_space_write_4(st, sh, EPIC_GENCTL, reg & ~GENCTL_INTENA); bus_space_write_4(st, sh, EPIC_INTMASK, 0); /* * Stop the DMA engine and take the receiver off-line. */ bus_space_write_4(st, sh, EPIC_COMMAND, COMMAND_STOP_RDMA | COMMAND_STOP_TDMA | COMMAND_STOP_RX); /* * Release any queued transmit buffers. */ for (i = 0; i < EPIC_NTXDESC; i++) { ds = EPIC_DSTX(sc, i); if (ds->ds_mbuf != NULL) { bus_dmamap_unload(sc->sc_dmat, ds->ds_dmamap); m_freem(ds->ds_mbuf); ds->ds_mbuf = NULL; } } if (drain) { /* * Release the receive buffers. */ epic_rxdrain(sc); } /* * Mark the interface down and cancel the watchdog timer. */ ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE); ifp->if_timer = 0; } /* * Read the EPIC Serial EEPROM. */ void epic_read_eeprom(sc, word, wordcnt, data) struct epic_softc *sc; int word, wordcnt; u_int16_t *data; { bus_space_tag_t st = sc->sc_st; bus_space_handle_t sh = sc->sc_sh; u_int16_t reg; int i, x; #define EEPROM_WAIT_READY(st, sh) \ while ((bus_space_read_4((st), (sh), EPIC_EECTL) & EECTL_EERDY) == 0) \ /* nothing */ /* * Enable the EEPROM. */ bus_space_write_4(st, sh, EPIC_EECTL, EECTL_ENABLE); EEPROM_WAIT_READY(st, sh); for (i = 0; i < wordcnt; i++) { /* Send CHIP SELECT for one clock tick. */ bus_space_write_4(st, sh, EPIC_EECTL, EECTL_ENABLE|EECTL_EECS); EEPROM_WAIT_READY(st, sh); /* Shift in the READ opcode. */ for (x = 3; x > 0; x--) { reg = EECTL_ENABLE|EECTL_EECS; if (EPIC_EEPROM_OPC_READ & (1 << (x - 1))) reg |= EECTL_EEDI; bus_space_write_4(st, sh, EPIC_EECTL, reg); EEPROM_WAIT_READY(st, sh); bus_space_write_4(st, sh, EPIC_EECTL, reg|EECTL_EESK); EEPROM_WAIT_READY(st, sh); bus_space_write_4(st, sh, EPIC_EECTL, reg); EEPROM_WAIT_READY(st, sh); } /* Shift in address. */ for (x = 6; x > 0; x--) { reg = EECTL_ENABLE|EECTL_EECS; if ((word + i) & (1 << (x - 1))) reg |= EECTL_EEDI; bus_space_write_4(st, sh, EPIC_EECTL, reg); EEPROM_WAIT_READY(st, sh); bus_space_write_4(st, sh, EPIC_EECTL, reg|EECTL_EESK); EEPROM_WAIT_READY(st, sh); bus_space_write_4(st, sh, EPIC_EECTL, reg); EEPROM_WAIT_READY(st, sh); } /* Shift out data. */ reg = EECTL_ENABLE|EECTL_EECS; data[i] = 0; for (x = 16; x > 0; x--) { bus_space_write_4(st, sh, EPIC_EECTL, reg|EECTL_EESK); EEPROM_WAIT_READY(st, sh); if (bus_space_read_4(st, sh, EPIC_EECTL) & EECTL_EEDO) data[i] |= (1 << (x - 1)); bus_space_write_4(st, sh, EPIC_EECTL, reg); EEPROM_WAIT_READY(st, sh); } /* Clear CHIP SELECT. */ bus_space_write_4(st, sh, EPIC_EECTL, EECTL_ENABLE); EEPROM_WAIT_READY(st, sh); } /* * Disable the EEPROM. */ bus_space_write_4(st, sh, EPIC_EECTL, 0); #undef EEPROM_WAIT_READY } /* * Add a receive buffer to the indicated descriptor. */ int epic_add_rxbuf(sc, idx) struct epic_softc *sc; int idx; { struct epic_descsoft *ds = EPIC_DSRX(sc, idx); struct mbuf *m; int error; MGETHDR(m, M_DONTWAIT, MT_DATA); if (m == NULL) return (ENOBUFS); MCLGET(m, M_DONTWAIT); if ((m->m_flags & M_EXT) == 0) { m_freem(m); return (ENOBUFS); } if (ds->ds_mbuf != NULL) bus_dmamap_unload(sc->sc_dmat, ds->ds_dmamap); ds->ds_mbuf = m; error = bus_dmamap_load(sc->sc_dmat, ds->ds_dmamap, m->m_ext.ext_buf, m->m_ext.ext_size, NULL, BUS_DMA_NOWAIT); if (error) { printf("%s: can't load rx DMA map %d, error = %d\n", sc->sc_dev.dv_xname, idx, error); panic("epic_add_rxbuf"); /* XXX */ } bus_dmamap_sync(sc->sc_dmat, ds->ds_dmamap, 0, ds->ds_dmamap->dm_mapsize, BUS_DMASYNC_PREREAD); EPIC_INIT_RXDESC(sc, idx); return (0); } /* * Set the EPIC multicast hash table. * * NOTE: We rely on a recently-updated mii_media_active here! */ void epic_set_mchash(sc) struct epic_softc *sc; { struct ethercom *ec = &sc->sc_ethercom; struct ifnet *ifp = &sc->sc_ethercom.ec_if; struct ether_multi *enm; struct ether_multistep step; u_int8_t *cp; u_int32_t crc, mchash[4]; int len; static const u_int32_t crctab[] = { 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c }; /* * Set up the multicast address filter by passing all multicast * addresses through a CRC generator, and then using the high-order * 6 bits as an index into the 64 bit multicast hash table (only * the lower 16 bits of each 32 bit multicast hash register are * valid). The high order bit selects the register, while the * rest of the bits select the bit within the register. */ if (ifp->if_flags & IFF_PROMISC) goto allmulti; if (IFM_SUBTYPE(sc->sc_mii.mii_media_active) == IFM_10_T) { /* XXX hardware bug in 10Mbps mode. */ goto allmulti; } mchash[0] = mchash[1] = mchash[2] = mchash[3] = 0; ETHER_FIRST_MULTI(step, ec, enm); while (enm != NULL) { if (bcmp(enm->enm_addrlo, enm->enm_addrhi, ETHER_ADDR_LEN)) { /* * We must listen to a range of multicast addresses. * For now, just accept all multicasts, rather than * trying to set only those filter bits needed to match * the range. (At this time, the only use of address * ranges is for IP multicast routing, for which the * range is big enough to require all bits set.) */ goto allmulti; } cp = enm->enm_addrlo; crc = 0xffffffff; for (len = sizeof(enm->enm_addrlo); --len >= 0;) { crc ^= *cp++; crc = (crc >> 4) ^ crctab[crc & 0xf]; crc = (crc >> 4) ^ crctab[crc & 0xf]; } /* Just want the 6 most significant bits. */ crc >>= 26; /* Set the corresponding bit in the hash table. */ mchash[crc >> 4] |= 1 << (crc & 0xf); ETHER_NEXT_MULTI(step, enm); } ifp->if_flags &= ~IFF_ALLMULTI; goto sethash; allmulti: ifp->if_flags |= IFF_ALLMULTI; mchash[0] = mchash[1] = mchash[2] = mchash[3] = 0xffff; sethash: bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_MC0, mchash[0]); bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_MC1, mchash[1]); bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_MC2, mchash[2]); bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_MC3, mchash[3]); } /* * Wait for the MII to become ready. */ int epic_mii_wait(sc, rw) struct epic_softc *sc; u_int32_t rw; { int i; for (i = 0; i < 50; i++) { if ((bus_space_read_4(sc->sc_st, sc->sc_sh, EPIC_MMCTL) & rw) == 0) break; delay(2); } if (i == 50) { printf("%s: MII timed out\n", sc->sc_dev.dv_xname); return (1); } return (0); } /* * Read from the MII. */ int epic_mii_read(self, phy, reg) struct device *self; int phy, reg; { struct epic_softc *sc = (struct epic_softc *)self; if (epic_mii_wait(sc, MMCTL_WRITE)) return (0); bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_MMCTL, MMCTL_ARG(phy, reg, MMCTL_READ)); if (epic_mii_wait(sc, MMCTL_READ)) return (0); return (bus_space_read_4(sc->sc_st, sc->sc_sh, EPIC_MMDATA) & MMDATA_MASK); } /* * Write to the MII. */ void epic_mii_write(self, phy, reg, val) struct device *self; int phy, reg, val; { struct epic_softc *sc = (struct epic_softc *)self; if (epic_mii_wait(sc, MMCTL_WRITE)) return; bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_MMDATA, val); bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_MMCTL, MMCTL_ARG(phy, reg, MMCTL_WRITE)); } /* * Callback from PHY when media changes. */ void epic_statchg(self) struct device *self; { struct epic_softc *sc = (struct epic_softc *)self; u_int32_t txcon; /* * Update loopback bits in TXCON to reflect duplex mode. */ txcon = bus_space_read_4(sc->sc_st, sc->sc_sh, EPIC_TXCON); if (sc->sc_mii.mii_media_active & IFM_FDX) txcon |= (TXCON_LOOPBACK_D1|TXCON_LOOPBACK_D2); else txcon &= ~(TXCON_LOOPBACK_D1|TXCON_LOOPBACK_D2); bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_TXCON, txcon); /* * There is a multicast filter bug in 10Mbps mode. Kick the * multicast filter in case the speed changed. */ epic_set_mchash(sc); /* XXX Update ifp->if_baudrate */ } /* * Callback from ifmedia to request current media status. */ void epic_mediastatus(ifp, ifmr) struct ifnet *ifp; struct ifmediareq *ifmr; { struct epic_softc *sc = ifp->if_softc; mii_pollstat(&sc->sc_mii); ifmr->ifm_status = sc->sc_mii.mii_media_status; ifmr->ifm_active = sc->sc_mii.mii_media_active; } /* * Callback from ifmedia to request new media setting. */ int epic_mediachange(ifp) struct ifnet *ifp; { struct epic_softc *sc = ifp->if_softc; if (ifp->if_flags & IFF_UP) mii_mediachg(&sc->sc_mii); return (0); }