/* $NetBSD: smc83c170.c,v 1.99 2024/09/07 06:17:37 andvar 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. * * 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 __KERNEL_RCSID(0, "$NetBSD: smc83c170.c,v 1.99 2024/09/07 06:17:37 andvar Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static void epic_start(struct ifnet *); static void epic_watchdog(struct ifnet *); static int epic_ioctl(struct ifnet *, u_long, void *); static int epic_init(struct ifnet *); static void epic_stop(struct ifnet *, int); static bool epic_shutdown(device_t, int); static void epic_reset(struct epic_softc *); static void epic_rxdrain(struct epic_softc *); static int epic_add_rxbuf(struct epic_softc *, int); static void epic_read_eeprom(struct epic_softc *, int, int, uint16_t *); static void epic_set_mchash(struct epic_softc *); static void epic_fixup_clock_source(struct epic_softc *); static int epic_mii_read(device_t, int, int, uint16_t *); static int epic_mii_write(device_t, int, int, uint16_t); static int epic_mii_wait(struct epic_softc *, uint32_t); static void epic_tick(void *); static void epic_statchg(struct ifnet *); static int epic_mediachange(struct ifnet *); #define INTMASK (INTSTAT_FATAL_INT | INTSTAT_TXU | \ INTSTAT_TXC | INTSTAT_RXE | INTSTAT_RQE | INTSTAT_RCC) int epic_copy_small = 0; #define ETHER_PAD_LEN (ETHER_MIN_LEN - ETHER_CRC_LEN) /* * Attach an EPIC interface to the system. */ void epic_attach(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; struct mii_data * const mii = &sc->sc_mii; int rseg, error, miiflags; u_int i; bus_dma_segment_t seg; uint8_t enaddr[ETHER_ADDR_LEN], devname[12 + 1]; uint16_t myea[ETHER_ADDR_LEN / 2], mydevname[6]; char *nullbuf; callout_init(&sc->sc_mii_callout, 0); callout_setfunc(&sc->sc_mii_callout, epic_tick, sc); /* * 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) + ETHER_PAD_LEN, PAGE_SIZE, 0, &seg, 1, &rseg, BUS_DMA_NOWAIT)) != 0) { aprint_error_dev(sc->sc_dev, "unable to allocate control data, error = %d\n", error); goto fail_0; } if ((error = bus_dmamem_map(sc->sc_dmat, &seg, rseg, sizeof(struct epic_control_data) + ETHER_PAD_LEN, (void **)&sc->sc_control_data, BUS_DMA_NOWAIT | BUS_DMA_COHERENT)) != 0) { aprint_error_dev(sc->sc_dev, "unable to map control data, error = %d\n", error); goto fail_1; } nullbuf = (char *)sc->sc_control_data + sizeof(struct epic_control_data); memset(nullbuf, 0, ETHER_PAD_LEN); 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) { aprint_error_dev(sc->sc_dev, "unable to create control data DMA map, error = %d\n", 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) { aprint_error_dev(sc->sc_dev, "unable to load control data DMA map, error = %d\n", 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) { aprint_error_dev(sc->sc_dev, "unable to create tx DMA map %d, error = %d\n", i, error); goto fail_4; } } /* * Create the receive 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) { aprint_error_dev(sc->sc_dev, "unable to create rx DMA map %d, error = %d\n", i, error); goto fail_5; } EPIC_DSRX(sc, i)->ds_mbuf = NULL; } /* * create and map the pad buffer */ if ((error = bus_dmamap_create(sc->sc_dmat, ETHER_PAD_LEN, 1, ETHER_PAD_LEN, 0, BUS_DMA_NOWAIT,&sc->sc_nulldmamap)) != 0) { aprint_error_dev(sc->sc_dev, "unable to create pad buffer DMA map, error = %d\n", error); goto fail_5; } if ((error = bus_dmamap_load(sc->sc_dmat, sc->sc_nulldmamap, nullbuf, ETHER_PAD_LEN, NULL, BUS_DMA_NOWAIT)) != 0) { aprint_error_dev(sc->sc_dev, "unable to load pad buffer DMA map, error = %d\n", error); goto fail_6; } bus_dmamap_sync(sc->sc_dmat, sc->sc_nulldmamap, 0, ETHER_PAD_LEN, BUS_DMASYNC_PREWRITE); /* * 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, __arraycount(myea), myea); for (i = 0; i < __arraycount(myea); i++) { enaddr[i * 2] = myea[i] & 0xff; enaddr[i * 2 + 1] = myea[i] >> 8; } /* * ...and the device name. */ epic_read_eeprom(sc, 0x2c, __arraycount(mydevname), mydevname); for (i = 0; i < __arraycount(mydevname); i++) { devname[i * 2] = mydevname[i] & 0xff; devname[i * 2 + 1] = mydevname[i] >> 8; } devname[sizeof(mydevname)] = '\0'; for (i = sizeof(mydevname) ; i > 0; i--) { if (devname[i - 1] == ' ') devname[i - 1] = '\0'; else break; } aprint_normal_dev(sc->sc_dev, "%s, Ethernet address %s\n", devname, ether_sprintf(enaddr)); miiflags = 0; if (sc->sc_hwflags & EPIC_HAS_MII_FIBER) miiflags |= MIIF_HAVEFIBER; /* * Initialize our media structures and probe the MII. */ mii->mii_ifp = ifp; mii->mii_readreg = epic_mii_read; mii->mii_writereg = epic_mii_write; mii->mii_statchg = epic_statchg; sc->sc_ethercom.ec_mii = mii; ifmedia_init(&mii->mii_media, IFM_IMASK, epic_mediachange, ether_mediastatus); mii_attach(sc->sc_dev, mii, 0xffffffff, MII_PHY_ANY, MII_OFFSET_ANY, miiflags); if (LIST_EMPTY(&mii->mii_phys)) { ifmedia_add(&mii->mii_media, IFM_ETHER | IFM_NONE, 0, NULL); ifmedia_set(&mii->mii_media, IFM_ETHER | IFM_NONE); } else ifmedia_set(&mii->mii_media, IFM_ETHER | IFM_AUTO); if (sc->sc_hwflags & EPIC_HAS_BNC) { /* use the next free media instance */ sc->sc_serinst = mii->mii_instance++; ifmedia_add(&mii->mii_media, IFM_MAKEWORD(IFM_ETHER, IFM_10_2, 0, sc->sc_serinst), 0, NULL); aprint_normal_dev(sc->sc_dev, "10base2/BNC\n"); } else sc->sc_serinst = -1; strlcpy(ifp->if_xname, device_xname(sc->sc_dev), IFNAMSIZ); 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; ifp->if_init = epic_init; ifp->if_stop = epic_stop; IFQ_SET_READY(&ifp->if_snd); /* * We can support 802.1Q VLAN-sized frames. */ sc->sc_ethercom.ec_capabilities |= ETHERCAP_VLAN_MTU; /* * Attach the interface. */ if_attach(ifp); if_deferred_start_init(ifp, NULL); ether_ifattach(ifp, enaddr); /* * Make sure the interface is shutdown during reboot. */ if (pmf_device_register1(sc->sc_dev, NULL, NULL, epic_shutdown)) pmf_class_network_register(sc->sc_dev, ifp); else aprint_error_dev(sc->sc_dev, "couldn't establish power handler\n"); return; /* * Free any resources we've allocated during the failed attach * attempt. Do this in reverse order and fall through. */ fail_6: bus_dmamap_destroy(sc->sc_dmat, sc->sc_nulldmamap); 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, (void *)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. */ static bool epic_shutdown(device_t self, int howto) { struct epic_softc *sc = device_private(self); epic_stop(&sc->sc_ethercom.ec_if, 1); return true; } /* * Start packet transmission on the interface. * [ifnet interface function] */ static void epic_start(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; u_int len; /* * 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. */ IFQ_POLL(&ifp->if_snd, m0); if (m0 == NULL) break; m = NULL; /* * 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 allotted number of frags, or we were * short on resources. In this case, we'll copy and try * again. */ if ((error = bus_dmamap_load_mbuf(sc->sc_dmat, dmamap, m0, BUS_DMA_WRITE | BUS_DMA_NOWAIT)) != 0 || (m0->m_pkthdr.len < ETHER_PAD_LEN && dmamap-> dm_nsegs == EPIC_NFRAGS)) { if (error == 0) bus_dmamap_unload(sc->sc_dmat, dmamap); MGETHDR(m, M_DONTWAIT, MT_DATA); if (m == NULL) { printf("%s: unable to allocate Tx mbuf\n", device_xname(sc->sc_dev)); break; } MCLAIM(m, &sc->sc_ethercom.ec_tx_mowner); 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", device_xname(sc->sc_dev)); m_freem(m); break; } } m_copydata(m0, 0, m0->m_pkthdr.len, mtod(m, void *)); m->m_pkthdr.len = m->m_len = m0->m_pkthdr.len; error = bus_dmamap_load_mbuf(sc->sc_dmat, dmamap, m, BUS_DMA_WRITE | BUS_DMA_NOWAIT); if (error) { printf("%s: unable to load Tx buffer, " "error = %d\n", device_xname(sc->sc_dev), error); break; } } IFQ_DEQUEUE(&ifp->if_snd, m0); if (m != NULL) { m_freem(m0); m0 = m; } /* Initialize the fraglist. */ 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; } len = m0->m_pkthdr.len; if (len < ETHER_PAD_LEN) { fr->ef_frags[seg].ef_addr = sc->sc_nulldma; fr->ef_frags[seg].ef_length = ETHER_PAD_LEN - len; len = ETHER_PAD_LEN; seg++; } fr->ef_nfrags = seg; 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. */ txd->et_control = ET_TXCTL_LASTDESC | ET_TXCTL_FRAGLIST; /* * 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 = TXSTAT_TXLENGTH(len); else txd->et_txstatus = TXSTAT_TXLENGTH(len) | ET_TXSTAT_OWNER; EPIC_CDTXSYNC(sc, nexttx, BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); /* Advance the tx pointer. */ sc->sc_txpending++; sc->sc_txlast = nexttx; /* * Pass the packet to any BPF listeners. */ bpf_mtap(ifp, m0, BPF_D_OUT); } 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] */ static void epic_watchdog(struct ifnet *ifp) { struct epic_softc *sc = ifp->if_softc; printf("%s: device timeout\n", device_xname(sc->sc_dev)); if_statinc(ifp, if_oerrors); (void)epic_init(ifp); } /* * Handle control requests from the operator. * [ifnet interface function] */ static int epic_ioctl(struct ifnet *ifp, u_long cmd, void *data) { struct epic_softc *sc = ifp->if_softc; int s, error; s = splnet(); error = ether_ioctl(ifp, cmd, data); 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. */ if (ifp->if_flags & IFF_RUNNING) { mii_pollstat(&sc->sc_mii); epic_set_mchash(sc); } error = 0; } splx(s); return error; } /* * Interrupt handler. */ int epic_intr(void *arg) { struct epic_softc *sc = arg; struct ifnet *ifp = &sc->sc_ethercom.ec_if; struct epic_rxdesc *rxd; struct epic_txdesc *txd; struct epic_descsoft *ds; struct mbuf *m; uint32_t intstat, rxstatus, txstatus; int i, claimed = 0; u_int len; 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); rxstatus = rxd->er_rxstatus; if (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 ((rxstatus & ER_RXSTAT_PKTINTACT) == 0) { if (rxstatus & ER_RXSTAT_CRCERROR) printf("%s: CRC error\n", device_xname(sc->sc_dev)); if (rxstatus & ER_RXSTAT_ALIGNERROR) printf("%s: alignment error\n", device_xname(sc->sc_dev)); if_statinc(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 = RXSTAT_RXLENGTH(rxstatus) - ETHER_CRC_LEN; if (len < sizeof(struct ether_header)) { /* * Runt packet; drop it now. */ if_statinc(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; MCLAIM(m, &sc->sc_ethercom.ec_rx_mowner); memcpy(mtod(m, void *), mtod(ds->ds_mbuf, void *), 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: if_statinc(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_set_rcvif(m, ifp); m->m_pkthdr.len = m->m_len = len; /* Pass it on. */ if_percpuq_enqueue(ifp->if_percpuq, m); } /* Update the receive pointer. */ sc->sc_rxptr = i; /* * Check for receive queue underflow. */ if (intstat & INTSTAT_RQE) { printf("%s: receiver queue empty\n", device_xname(sc->sc_dev)); /* * 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)) { 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); txstatus = txd->et_txstatus; if (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. */ net_stat_ref_t nsr = IF_STAT_GETREF(ifp); if ((txstatus & ET_TXSTAT_PACKETTX) == 0) if_statinc_ref(ifp, nsr, if_oerrors); else if_statinc_ref(ifp, nsr, if_opackets); if (TXSTAT_COLLISIONS(txstatus)) if_statadd_ref(ifp, nsr, if_collisions, TXSTAT_COLLISIONS(txstatus)); if (txstatus & ET_TXSTAT_CARSENSELOST) printf("%s: lost carrier\n", device_xname(sc->sc_dev)); IF_STAT_PUTREF(ifp); } /* 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", device_xname(sc->sc_dev)); 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. */ if_schedule_deferred_start(ifp); } /* * Check for fatal interrupts. */ if (intstat & INTSTAT_FATAL_INT) { if (intstat & INTSTAT_PTA) printf("%s: PCI target abort error\n", device_xname(sc->sc_dev)); else if (intstat & INTSTAT_PMA) printf("%s: PCI master abort error\n", device_xname(sc->sc_dev)); else if (intstat & INTSTAT_APE) printf("%s: PCI address parity error\n", device_xname(sc->sc_dev)); else if (intstat & INTSTAT_DPE) printf("%s: PCI data parity error\n", device_xname(sc->sc_dev)); else printf("%s: unknown fatal error\n", device_xname(sc->sc_dev)); (void)epic_init(ifp); } /* * Check for more interrupts. */ goto top; } /* * One second timer, used to tick the MII. */ static void epic_tick(void *arg) { struct epic_softc *sc = arg; int s; s = splnet(); mii_tick(&sc->sc_mii); splx(s); callout_schedule(&sc->sc_mii_callout, hz); } /* * Fixup the clock source on the EPIC. */ static void epic_fixup_clock_source(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. */ static void epic_reset(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(). */ static int epic_init(struct ifnet *ifp) { struct epic_softc *sc = ifp->if_softc; bus_space_tag_t st = sc->sc_st; bus_space_handle_t sh = sc->sc_sh; const uint8_t *enaddr = CLLADDR(ifp->if_sadl); struct epic_txdesc *txd; struct epic_descsoft *ds; uint32_t genctl, reg0; int i, error = 0; /* * Cancel any pending I/O. */ epic_stop(ifp, 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(1000); 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. */ if ((error = epic_mediachange(ifp)) != 0) goto out; /* 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", device_xname(sc->sc_dev), i, error); /* * XXX Should attempt to run with fewer receive * XXX buffers instead of just failing. */ epic_rxdrain(sc); goto out; } } else EPIC_INIT_RXDESC(sc, i); } 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; /* * Start the one second clock. */ callout_schedule(&sc->sc_mii_callout, hz); /* * Attempt to start output on the interface. */ epic_start(ifp); out: if (error) printf("%s: interface not running\n", device_xname(sc->sc_dev)); return error; } /* * Drain the receive queue. */ static void epic_rxdrain(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. */ static void epic_stop(struct ifnet *ifp, int disable) { struct epic_softc *sc = ifp->if_softc; bus_space_tag_t st = sc->sc_st; bus_space_handle_t sh = sc->sc_sh; struct epic_descsoft *ds; uint32_t reg; int i; /* * Stop the one second clock. */ callout_stop(&sc->sc_mii_callout); /* Down the MII. */ mii_down(&sc->sc_mii); /* 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; } } /* * Mark the interface down and cancel the watchdog timer. */ ifp->if_flags &= ~IFF_RUNNING; ifp->if_timer = 0; if (disable) epic_rxdrain(sc); } /* * Read the EPIC Serial EEPROM. */ static void epic_read_eeprom(struct epic_softc *sc, int word, int wordcnt, uint16_t *data) { bus_space_tag_t st = sc->sc_st; bus_space_handle_t sh = sc->sc_sh; uint16_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. */ static int epic_add_rxbuf(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; MCLAIM(m, &sc->sc_ethercom.ec_rx_mowner); 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_READ | BUS_DMA_NOWAIT); if (error) { printf("%s: can't load rx DMA map %d, error = %d\n", device_xname(sc->sc_dev), idx, error); panic("%s", __func__); /* 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! */ static void epic_set_mchash(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; uint32_t hash, mchash[4]; /* * Set up the multicast address filter by passing all multicast * addresses through a CRC generator, and then using the low-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 bits select 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_LOCK(ec); ETHER_FIRST_MULTI(step, ec, enm); while (enm != NULL) { if (memcmp(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.) */ ETHER_UNLOCK(ec); goto allmulti; } hash = ether_crc32_be(enm->enm_addrlo, ETHER_ADDR_LEN); hash >>= 26; /* Set the corresponding bit in the hash table. */ mchash[hash >> 4] |= 1 << (hash & 0xf); ETHER_NEXT_MULTI(step, enm); } ETHER_UNLOCK(ec); 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. */ static int epic_mii_wait(struct epic_softc *sc, uint32_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", device_xname(sc->sc_dev)); return ETIMEDOUT; } return 0; } /* * Read from the MII. */ static int epic_mii_read(device_t self, int phy, int reg, uint16_t *val) { struct epic_softc *sc = device_private(self); int rv; if ((rv = epic_mii_wait(sc, MMCTL_WRITE)) != 0) return rv; bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_MMCTL, MMCTL_ARG(phy, reg, MMCTL_READ)); if ((rv = epic_mii_wait(sc, MMCTL_READ)) != 0) return rv; *val = bus_space_read_4(sc->sc_st, sc->sc_sh, EPIC_MMDATA) & MMDATA_MASK; return 0; } /* * Write to the MII. */ static int epic_mii_write(device_t self, int phy, int reg, uint16_t val) { struct epic_softc *sc = device_private(self); int rv; if ((rv = epic_mii_wait(sc, MMCTL_WRITE)) != 0) return rv; 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)); return 0; } /* * Callback from PHY when media changes. */ static void epic_statchg(struct ifnet *ifp) { struct epic_softc *sc = ifp->if_softc; uint32_t txcon, miicfg; /* * 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); /* On some cards we need manually set fullduplex led */ if (sc->sc_hwflags & EPIC_DUPLEXLED_ON_694) { miicfg = bus_space_read_4(sc->sc_st, sc->sc_sh, EPIC_MIICFG); if (IFM_OPTIONS(sc->sc_mii.mii_media_active) & IFM_FDX) miicfg |= MIICFG_ENABLE; else miicfg &= ~MIICFG_ENABLE; bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_MIICFG, miicfg); } /* * There is a multicast filter bug in 10Mbps mode. Kick the * multicast filter in case the speed changed. */ epic_set_mchash(sc); } /* * Callback from ifmedia to request new media setting. * * XXX Looks to me like some of this complexity should move into * XXX one or two custom PHY drivers. --dyoung */ static int epic_mediachange(struct ifnet *ifp) { struct epic_softc *sc = ifp->if_softc; struct mii_data *mii = &sc->sc_mii; struct ifmedia *ifm = &mii->mii_media; int media = ifm->ifm_cur->ifm_media; uint32_t miicfg; struct mii_softc *miisc; int rc; uint16_t cfg; if ((ifp->if_flags & IFF_UP) == 0) return 0; if (IFM_INST(media) != sc->sc_serinst) { /* If we're not selecting serial interface, select MII mode */ #ifdef EPICMEDIADEBUG printf("%s: parallel mode\n", ifp->if_xname); #endif miicfg = bus_space_read_4(sc->sc_st, sc->sc_sh, EPIC_MIICFG); miicfg &= ~MIICFG_SERMODEENA; bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_MIICFG, miicfg); } if ((rc = mii_mediachg(mii)) == ENXIO) rc = 0; if (IFM_INST(media) == sc->sc_serinst) { /* select serial interface */ #ifdef EPICMEDIADEBUG printf("%s: serial mode\n", ifp->if_xname); #endif miicfg = bus_space_read_4(sc->sc_st, sc->sc_sh, EPIC_MIICFG); miicfg |= (MIICFG_SERMODEENA | MIICFG_ENABLE); bus_space_write_4(sc->sc_st, sc->sc_sh, EPIC_MIICFG, miicfg); /* There is no driver to fill this */ mii->mii_media_active = media; mii->mii_media_status = 0; epic_statchg(mii->mii_ifp); return 0; } /* Lookup selected PHY */ LIST_FOREACH(miisc, &mii->mii_phys, mii_list) { if (IFM_INST(media) == miisc->mii_inst) break; } if (!miisc) { printf("%s: can't happen\n", __func__); /* ??? panic */ return 0; } #ifdef EPICMEDIADEBUG printf("%s: using phy %s\n", ifp->if_xname, device_xname(miisc->mii_dev)); #endif if (miisc->mii_flags & MIIF_HAVEFIBER) { /* XXX XXX assume it's a Level1 - should check */ /* We have to powerup fiber transceivers */ PHY_READ(miisc, MII_LXTPHY_CONFIG, &cfg); if (IFM_SUBTYPE(media) == IFM_100_FX) { #ifdef EPICMEDIADEBUG printf("%s: power up fiber\n", ifp->if_xname); #endif cfg |= (CONFIG_LEDC1 | CONFIG_LEDC0); } else { #ifdef EPICMEDIADEBUG printf("%s: power down fiber\n", ifp->if_xname); #endif cfg &= ~(CONFIG_LEDC1 | CONFIG_LEDC0); } PHY_WRITE(miisc, MII_LXTPHY_CONFIG, cfg); } return rc; }