NetBSD-5.0.2/sys/arch/powerpc/ibm4xx/dev/if_emac.c
/* $NetBSD: if_emac.c,v 1.33 2008/07/08 17:32:56 kiyohara Exp $ */
/*
* Copyright 2001, 2002 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Simon Burge and Jason Thorpe for Wasabi Systems, Inc.
*
* 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 for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_emac.c,v 1.33 2008/07/08 17:32:56 kiyohara Exp $");
#include "bpfilter.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <uvm/uvm_extern.h> /* for PAGE_SIZE */
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_ether.h>
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#include <powerpc/ibm4xx/dev/opbvar.h>
#include <powerpc/ibm4xx/ibm405gp.h>
#include <powerpc/ibm4xx/mal405gp.h>
#include <powerpc/ibm4xx/dcr405gp.h>
#include <powerpc/ibm4xx/dev/emacreg.h>
#include <powerpc/ibm4xx/dev/if_emacreg.h>
#include <dev/mii/miivar.h>
/*
* Transmit descriptor list size. There are two Tx channels, each with
* up to 256 hardware descriptors available. We currently use one Tx
* channel. We tell the upper layers that they can queue a lot of
* packets, and we go ahead and manage up to 64 of them at a time. We
* allow up to 16 DMA segments per packet.
*/
#define EMAC_NTXSEGS 16
#define EMAC_TXQUEUELEN 64
#define EMAC_TXQUEUELEN_MASK (EMAC_TXQUEUELEN - 1)
#define EMAC_TXQUEUE_GC (EMAC_TXQUEUELEN / 4)
#define EMAC_NTXDESC 256
#define EMAC_NTXDESC_MASK (EMAC_NTXDESC - 1)
#define EMAC_NEXTTX(x) (((x) + 1) & EMAC_NTXDESC_MASK)
#define EMAC_NEXTTXS(x) (((x) + 1) & EMAC_TXQUEUELEN_MASK)
/*
* Receive descriptor list size. There is one Rx channel with up to 256
* hardware descriptors available. We allocate 64 receive descriptors,
* each with a 2k buffer (MCLBYTES).
*/
#define EMAC_NRXDESC 64
#define EMAC_NRXDESC_MASK (EMAC_NRXDESC - 1)
#define EMAC_NEXTRX(x) (((x) + 1) & EMAC_NRXDESC_MASK)
#define EMAC_PREVRX(x) (((x) - 1) & EMAC_NRXDESC_MASK)
/*
* Transmit/receive descriptors that are DMA'd to the EMAC.
*/
struct emac_control_data {
struct mal_descriptor ecd_txdesc[EMAC_NTXDESC];
struct mal_descriptor ecd_rxdesc[EMAC_NRXDESC];
};
#define EMAC_CDOFF(x) offsetof(struct emac_control_data, x)
#define EMAC_CDTXOFF(x) EMAC_CDOFF(ecd_txdesc[(x)])
#define EMAC_CDRXOFF(x) EMAC_CDOFF(ecd_rxdesc[(x)])
/*
* Software state for transmit jobs.
*/
struct emac_txsoft {
struct mbuf *txs_mbuf; /* head of mbuf chain */
bus_dmamap_t txs_dmamap; /* our DMA map */
int txs_firstdesc; /* first descriptor in packet */
int txs_lastdesc; /* last descriptor in packet */
int txs_ndesc; /* # of descriptors used */
};
/*
* Software state for receive descriptors.
*/
struct emac_rxsoft {
struct mbuf *rxs_mbuf; /* head of mbuf chain */
bus_dmamap_t rxs_dmamap; /* our DMA map */
};
/*
* Software state per device.
*/
struct emac_softc {
struct device sc_dev; /* generic device information */
bus_space_tag_t sc_st; /* bus space tag */
bus_space_handle_t sc_sh; /* bus space handle */
bus_dma_tag_t sc_dmat; /* bus DMA tag */
struct ethercom sc_ethercom; /* ethernet common data */
void *sc_sdhook; /* shutdown hook */
void *sc_powerhook; /* power management hook */
struct mii_data sc_mii; /* MII/media information */
struct callout sc_callout; /* tick callout */
u_int32_t sc_mr1; /* copy of Mode Register 1 */
bus_dmamap_t sc_cddmamap; /* control data dma map */
#define sc_cddma sc_cddmamap->dm_segs[0].ds_addr
/* Software state for transmit/receive descriptors. */
struct emac_txsoft sc_txsoft[EMAC_TXQUEUELEN];
struct emac_rxsoft sc_rxsoft[EMAC_NRXDESC];
/* Control data structures. */
struct emac_control_data *sc_control_data;
#define sc_txdescs sc_control_data->ecd_txdesc
#define sc_rxdescs sc_control_data->ecd_rxdesc
#ifdef EMAC_EVENT_COUNTERS
struct evcnt sc_ev_rxintr; /* Rx interrupts */
struct evcnt sc_ev_txintr; /* Tx interrupts */
struct evcnt sc_ev_rxde; /* Rx descriptor interrupts */
struct evcnt sc_ev_txde; /* Tx descriptor interrupts */
struct evcnt sc_ev_wol; /* Wake-On-Lan interrupts */
struct evcnt sc_ev_serr; /* MAL system error interrupts */
struct evcnt sc_ev_intr; /* General EMAC interrupts */
struct evcnt sc_ev_txreap; /* Calls to Tx descriptor reaper */
struct evcnt sc_ev_txsstall; /* Tx stalled due to no txs */
struct evcnt sc_ev_txdstall; /* Tx stalled due to no txd */
struct evcnt sc_ev_txdrop; /* Tx packets dropped (too many segs) */
struct evcnt sc_ev_tu; /* Tx underrun */
#endif /* EMAC_EVENT_COUNTERS */
int sc_txfree; /* number of free Tx descriptors */
int sc_txnext; /* next ready Tx descriptor */
int sc_txsfree; /* number of free Tx jobs */
int sc_txsnext; /* next ready Tx job */
int sc_txsdirty; /* dirty Tx jobs */
int sc_rxptr; /* next ready RX descriptor/descsoft */
};
#ifdef EMAC_EVENT_COUNTERS
#define EMAC_EVCNT_INCR(ev) (ev)->ev_count++
#else
#define EMAC_EVCNT_INCR(ev) /* nothing */
#endif
#define EMAC_CDTXADDR(sc, x) ((sc)->sc_cddma + EMAC_CDTXOFF((x)))
#define EMAC_CDRXADDR(sc, x) ((sc)->sc_cddma + EMAC_CDRXOFF((x)))
#define EMAC_CDTXSYNC(sc, x, n, ops) \
do { \
int __x, __n; \
\
__x = (x); \
__n = (n); \
\
/* If it will wrap around, sync to the end of the ring. */ \
if ((__x + __n) > EMAC_NTXDESC) { \
bus_dmamap_sync((sc)->sc_dmat, (sc)->sc_cddmamap, \
EMAC_CDTXOFF(__x), sizeof(struct mal_descriptor) * \
(EMAC_NTXDESC - __x), (ops)); \
__n -= (EMAC_NTXDESC - __x); \
__x = 0; \
} \
\
/* Now sync whatever is left. */ \
bus_dmamap_sync((sc)->sc_dmat, (sc)->sc_cddmamap, \
EMAC_CDTXOFF(__x), sizeof(struct mal_descriptor) * __n, (ops)); \
} while (/*CONSTCOND*/0)
#define EMAC_CDRXSYNC(sc, x, ops) \
do { \
bus_dmamap_sync((sc)->sc_dmat, (sc)->sc_cddmamap, \
EMAC_CDRXOFF((x)), sizeof(struct mal_descriptor), (ops)); \
} while (/*CONSTCOND*/0)
#define EMAC_INIT_RXDESC(sc, x) \
do { \
struct emac_rxsoft *__rxs = &(sc)->sc_rxsoft[(x)]; \
struct mal_descriptor *__rxd = &(sc)->sc_rxdescs[(x)]; \
struct mbuf *__m = __rxs->rxs_mbuf; \
\
/* \
* Note: We scoot the packet forward 2 bytes in the buffer \
* so that the payload after the Ethernet header is aligned \
* to a 4-byte boundary. \
*/ \
__m->m_data = __m->m_ext.ext_buf + 2; \
\
__rxd->md_data = __rxs->rxs_dmamap->dm_segs[0].ds_addr + 2; \
__rxd->md_data_len = __m->m_ext.ext_size - 2; \
__rxd->md_stat_ctrl = MAL_RX_EMPTY | MAL_RX_INTERRUPT | \
/* Set wrap on last descriptor. */ \
(((x) == EMAC_NRXDESC - 1) ? MAL_RX_WRAP : 0); \
EMAC_CDRXSYNC((sc), (x), BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE); \
} while (/*CONSTCOND*/0)
#define EMAC_WRITE(sc, reg, val) \
bus_space_write_stream_4((sc)->sc_st, (sc)->sc_sh, (reg), (val))
#define EMAC_READ(sc, reg) \
bus_space_read_stream_4((sc)->sc_st, (sc)->sc_sh, (reg))
#define EMAC_SET_FILTER(aht, category) \
do { \
(aht)[3 - ((category) >> 4)] |= 1 << ((category) & 0xf); \
} while (/*CONSTCOND*/0)
static int emac_match(struct device *, struct cfdata *, void *);
static void emac_attach(struct device *, struct device *, void *);
static int emac_add_rxbuf(struct emac_softc *, int);
static int emac_init(struct ifnet *);
static int emac_ioctl(struct ifnet *, u_long, void *);
static void emac_reset(struct emac_softc *);
static void emac_rxdrain(struct emac_softc *);
static int emac_txreap(struct emac_softc *);
static void emac_shutdown(void *);
static void emac_start(struct ifnet *);
static void emac_stop(struct ifnet *, int);
static void emac_watchdog(struct ifnet *);
static int emac_set_filter(struct emac_softc *);
static int emac_wol_intr(void *);
static int emac_serr_intr(void *);
static int emac_txeob_intr(void *);
static int emac_rxeob_intr(void *);
static int emac_txde_intr(void *);
static int emac_rxde_intr(void *);
static int emac_intr(void *);
static int emac_mii_readreg(struct device *, int, int);
static void emac_mii_statchg(struct device *);
static void emac_mii_tick(void *);
static uint32_t emac_mii_wait(struct emac_softc *);
static void emac_mii_writereg(struct device *, int, int, int);
int emac_copy_small = 0;
CFATTACH_DECL(emac, sizeof(struct emac_softc),
emac_match, emac_attach, NULL, NULL);
static int
emac_match(struct device *parent, struct cfdata *cf, void *aux)
{
struct opb_attach_args *oaa = aux;
/* match only on-chip ethernet devices */
if (strcmp(oaa->opb_name, cf->cf_name) == 0)
return (1);
return (0);
}
static void
emac_attach(struct device *parent, struct device *self, void *aux)
{
struct opb_attach_args *oaa = aux;
struct emac_softc *sc = (struct emac_softc *)self;
struct ifnet *ifp = &sc->sc_ethercom.ec_if;
struct mii_data *mii = &sc->sc_mii;
bus_dma_segment_t seg;
int error, i, nseg;
const uint8_t *enaddr;
prop_data_t ea;
bus_space_map(oaa->opb_bt, oaa->opb_addr, EMAC_NREG, 0, &sc->sc_sh);
sc->sc_st = oaa->opb_bt;
sc->sc_dmat = oaa->opb_dmat;
printf(": 405GP EMAC\n");
callout_init(&sc->sc_callout, 0);
/*
* Set up Mode Register 1 - set receive and transmit FIFOs to maximum
* size, allow transmit of multiple packets (only channel 0 is used).
*
* XXX: Allow pause packets??
*/
sc->sc_mr1 = MR1_RFS_4KB | MR1_TFS_2KB | MR1_TR0_MULTIPLE;
intr_establish(oaa->opb_irq , IST_LEVEL, IPL_NET, emac_wol_intr, sc);
intr_establish(oaa->opb_irq + 1, IST_LEVEL, IPL_NET, emac_serr_intr, sc);
intr_establish(oaa->opb_irq + 2, IST_LEVEL, IPL_NET, emac_txeob_intr, sc);
intr_establish(oaa->opb_irq + 3, IST_LEVEL, IPL_NET, emac_rxeob_intr, sc);
intr_establish(oaa->opb_irq + 4, IST_LEVEL, IPL_NET, emac_txde_intr, sc);
intr_establish(oaa->opb_irq + 5, IST_LEVEL, IPL_NET, emac_rxde_intr, sc);
intr_establish(oaa->opb_irq + 6, IST_LEVEL, IPL_NET, emac_intr, sc);
printf("%s: interrupting at irqs %d .. %d\n", sc->sc_dev.dv_xname,
oaa->opb_irq, oaa->opb_irq + 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 emac_control_data), 0, 0, &seg, 1, &nseg, 0)) != 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, nseg,
sizeof(struct emac_control_data), (void **)&sc->sc_control_data,
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 emac_control_data), 1,
sizeof(struct emac_control_data), 0, 0, &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 emac_control_data), NULL,
0)) != 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 < EMAC_TXQUEUELEN; i++) {
if ((error = bus_dmamap_create(sc->sc_dmat, MCLBYTES,
EMAC_NTXSEGS, MCLBYTES, 0, 0,
&sc->sc_txsoft[i].txs_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 receive buffer DMA maps.
*/
for (i = 0; i < EMAC_NRXDESC; i++) {
if ((error = bus_dmamap_create(sc->sc_dmat, MCLBYTES, 1,
MCLBYTES, 0, 0, &sc->sc_rxsoft[i].rxs_dmamap)) != 0) {
printf("%s: unable to create rx DMA map %d, "
"error = %d\n", sc->sc_dev.dv_xname, i, error);
goto fail_5;
}
sc->sc_rxsoft[i].rxs_mbuf = NULL;
}
/*
* Reset the chip to a known state.
*/
emac_reset(sc);
/* Fetch the Ethernet address. */
ea = prop_dictionary_get(device_properties(&sc->sc_dev), "mac-addr");
if (ea == NULL) {
printf("%s: unable to get mac-addr property\n",
sc->sc_dev.dv_xname);
return;
}
KASSERT(prop_object_type(ea) == PROP_TYPE_DATA);
KASSERT(prop_data_size(ea) == ETHER_ADDR_LEN);
enaddr = prop_data_data_nocopy(ea);
printf("%s: Ethernet address %s\n", sc->sc_dev.dv_xname,
ether_sprintf(enaddr));
/*
* Initialise the media structures.
*/
mii->mii_ifp = ifp;
mii->mii_readreg = emac_mii_readreg;
mii->mii_writereg = emac_mii_writereg;
mii->mii_statchg = emac_mii_statchg;
sc->sc_ethercom.ec_mii = mii;
ifmedia_init(&mii->mii_media, 0, ether_mediachange, ether_mediastatus);
mii_attach(&sc->sc_dev, mii, 0xffffffff,
MII_PHY_ANY, MII_OFFSET_ANY, 0);
if (LIST_FIRST(&mii->mii_phys) == NULL) {
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);
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 = emac_ioctl;
ifp->if_start = emac_start;
ifp->if_watchdog = emac_watchdog;
ifp->if_init = emac_init;
ifp->if_stop = emac_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);
ether_ifattach(ifp, enaddr);
#ifdef EMAC_EVENT_COUNTERS
/*
* Attach the event counters.
*/
evcnt_attach_dynamic(&sc->sc_ev_rxintr, EVCNT_TYPE_INTR,
NULL, sc->sc_dev.dv_xname, "rxintr");
evcnt_attach_dynamic(&sc->sc_ev_txintr, EVCNT_TYPE_INTR,
NULL, sc->sc_dev.dv_xname, "txintr");
evcnt_attach_dynamic(&sc->sc_ev_rxde, EVCNT_TYPE_INTR,
NULL, sc->sc_dev.dv_xname, "rxde");
evcnt_attach_dynamic(&sc->sc_ev_txde, EVCNT_TYPE_INTR,
NULL, sc->sc_dev.dv_xname, "txde");
evcnt_attach_dynamic(&sc->sc_ev_wol, EVCNT_TYPE_INTR,
NULL, sc->sc_dev.dv_xname, "wol");
evcnt_attach_dynamic(&sc->sc_ev_serr, EVCNT_TYPE_INTR,
NULL, sc->sc_dev.dv_xname, "serr");
evcnt_attach_dynamic(&sc->sc_ev_intr, EVCNT_TYPE_INTR,
NULL, sc->sc_dev.dv_xname, "intr");
evcnt_attach_dynamic(&sc->sc_ev_txreap, EVCNT_TYPE_MISC,
NULL, sc->sc_dev.dv_xname, "txreap");
evcnt_attach_dynamic(&sc->sc_ev_txsstall, EVCNT_TYPE_MISC,
NULL, sc->sc_dev.dv_xname, "txsstall");
evcnt_attach_dynamic(&sc->sc_ev_txdstall, EVCNT_TYPE_MISC,
NULL, sc->sc_dev.dv_xname, "txdstall");
evcnt_attach_dynamic(&sc->sc_ev_txdrop, EVCNT_TYPE_MISC,
NULL, sc->sc_dev.dv_xname, "txdrop");
evcnt_attach_dynamic(&sc->sc_ev_tu, EVCNT_TYPE_MISC,
NULL, sc->sc_dev.dv_xname, "tu");
#endif /* EMAC_EVENT_COUNTERS */
/*
* Make sure the interface is shutdown during reboot.
*/
sc->sc_sdhook = shutdownhook_establish(emac_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 < EMAC_NRXDESC; i++) {
if (sc->sc_rxsoft[i].rxs_dmamap != NULL)
bus_dmamap_destroy(sc->sc_dmat,
sc->sc_rxsoft[i].rxs_dmamap);
}
fail_4:
for (i = 0; i < EMAC_TXQUEUELEN; i++) {
if (sc->sc_txsoft[i].txs_dmamap != NULL)
bus_dmamap_destroy(sc->sc_dmat,
sc->sc_txsoft[i].txs_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 emac_control_data));
fail_1:
bus_dmamem_free(sc->sc_dmat, &seg, nseg);
fail_0:
return;
}
/*
* Device shutdown routine.
*/
static void
emac_shutdown(void *arg)
{
struct emac_softc *sc = arg;
emac_stop(&sc->sc_ethercom.ec_if, 0);
}
/* ifnet interface function */
static void
emac_start(struct ifnet *ifp)
{
struct emac_softc *sc = ifp->if_softc;
struct mbuf *m0;
struct emac_txsoft *txs;
bus_dmamap_t dmamap;
int error, firsttx, nexttx, lasttx, ofree, seg;
lasttx = 0; /* XXX gcc */
if ((ifp->if_flags & (IFF_RUNNING|IFF_OACTIVE)) != IFF_RUNNING)
return;
/*
* Remember the previous number of free descriptors.
*/
ofree = sc->sc_txfree;
/*
* Loop through the send queue, setting up transmit descriptors
* until we drain the queue, or use up all available transmit
* descriptors.
*/
for (;;) {
/* Grab a packet off the queue. */
IFQ_POLL(&ifp->if_snd, m0);
if (m0 == NULL)
break;
/*
* Get a work queue entry. Reclaim used Tx descriptors if
* we are running low.
*/
if (sc->sc_txsfree < EMAC_TXQUEUE_GC) {
emac_txreap(sc);
if (sc->sc_txsfree == 0) {
EMAC_EVCNT_INCR(&sc->sc_ev_txsstall);
break;
}
}
txs = &sc->sc_txsoft[sc->sc_txsnext];
dmamap = txs->txs_dmamap;
/*
* Load the DMA map. If this fails, the packet either
* didn't fit in the alloted number of segments, or we
* were short on resources. In this case, we'll copy
* and try again.
*/
error = bus_dmamap_load_mbuf(sc->sc_dmat, dmamap, m0,
BUS_DMA_WRITE|BUS_DMA_NOWAIT);
if (error) {
if (error == EFBIG) {
EMAC_EVCNT_INCR(&sc->sc_ev_txdrop);
printf("%s: Tx packet consumes too many "
"DMA segments, dropping...\n",
sc->sc_dev.dv_xname);
IFQ_DEQUEUE(&ifp->if_snd, m0);
m_freem(m0);
continue;
}
/* Short on resources, just stop for now. */
break;
}
/*
* Ensure we have enough descriptors free to describe
* the packet.
*/
if (dmamap->dm_nsegs > sc->sc_txfree) {
/*
* Not enough free descriptors to transmit this
* packet. We haven't committed anything yet,
* so just unload the DMA map, put the packet
* back on the queue, and punt. Notify the upper
* layer that there are not more slots left.
*
*/
ifp->if_flags |= IFF_OACTIVE;
bus_dmamap_unload(sc->sc_dmat, dmamap);
EMAC_EVCNT_INCR(&sc->sc_ev_txdstall);
break;
}
IFQ_DEQUEUE(&ifp->if_snd, m0);
/*
* WE ARE NOW COMMITTED TO TRANSMITTING THE PACKET.
*/
/* 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 that we can free it
* later.
*/
txs->txs_mbuf = m0;
txs->txs_firstdesc = sc->sc_txnext;
txs->txs_ndesc = dmamap->dm_nsegs;
/*
* Initialize the transmit descriptor.
*/
firsttx = sc->sc_txnext;
for (nexttx = sc->sc_txnext, seg = 0;
seg < dmamap->dm_nsegs;
seg++, nexttx = EMAC_NEXTTX(nexttx)) {
/*
* If this is the first descriptor we're
* enqueueing, don't set the TX_READY bit just
* yet. That could cause a race condition.
* We'll do it below.
*/
sc->sc_txdescs[nexttx].md_data =
dmamap->dm_segs[seg].ds_addr;
sc->sc_txdescs[nexttx].md_data_len =
dmamap->dm_segs[seg].ds_len;
sc->sc_txdescs[nexttx].md_stat_ctrl =
(sc->sc_txdescs[nexttx].md_stat_ctrl & MAL_TX_WRAP) |
(nexttx == firsttx ? 0 : MAL_TX_READY) |
EMAC_TXC_GFCS | EMAC_TXC_GPAD;
lasttx = nexttx;
}
/* Set the LAST bit on the last segment. */
sc->sc_txdescs[lasttx].md_stat_ctrl |= MAL_TX_LAST;
/*
* Set up last segment descriptor to send an interrupt after
* that descriptor is transmitted, and bypass existing Tx
* descriptor reaping method (for now...).
*/
sc->sc_txdescs[lasttx].md_stat_ctrl |= MAL_TX_INTERRUPT;
txs->txs_lastdesc = lasttx;
/* Sync the descriptors we're using. */
EMAC_CDTXSYNC(sc, sc->sc_txnext, dmamap->dm_nsegs,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
/*
* The entire packet chain is set up. Give the
* first descriptor to the chip now.
*/
sc->sc_txdescs[firsttx].md_stat_ctrl |= MAL_TX_READY;
EMAC_CDTXSYNC(sc, firsttx, 1,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
/*
* Tell the EMAC that a new packet is available.
*/
EMAC_WRITE(sc, EMAC_TMR0, TMR0_GNP0);
/* Advance the tx pointer. */
sc->sc_txfree -= txs->txs_ndesc;
sc->sc_txnext = nexttx;
sc->sc_txsfree--;
sc->sc_txsnext = EMAC_NEXTTXS(sc->sc_txsnext);
#if NBPFILTER > 0
/*
* Pass the packet to any BPF listeners.
*/
if (ifp->if_bpf)
bpf_mtap(ifp->if_bpf, m0);
#endif /* NBPFILTER > 0 */
}
if (sc->sc_txfree == 0) {
/* No more slots left; notify upper layer. */
ifp->if_flags |= IFF_OACTIVE;
}
if (sc->sc_txfree != ofree) {
/* Set a watchdog timer in case the chip flakes out. */
ifp->if_timer = 5;
}
}
static int
emac_init(struct ifnet *ifp)
{
struct emac_softc *sc = ifp->if_softc;
struct emac_rxsoft *rxs;
const uint8_t *enaddr = CLLADDR(ifp->if_sadl);
int error, i;
error = 0;
/* Cancel any pending I/O. */
emac_stop(ifp, 0);
/* Reset the chip to a known state. */
emac_reset(sc);
/*
* Initialise the transmit descriptor ring.
*/
memset(sc->sc_txdescs, 0, sizeof(sc->sc_txdescs));
/* set wrap on last descriptor */
sc->sc_txdescs[EMAC_NTXDESC - 1].md_stat_ctrl |= MAL_TX_WRAP;
EMAC_CDTXSYNC(sc, 0, EMAC_NTXDESC,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
sc->sc_txfree = EMAC_NTXDESC;
sc->sc_txnext = 0;
/*
* Initialise the transmit job descriptors.
*/
for (i = 0; i < EMAC_TXQUEUELEN; i++)
sc->sc_txsoft[i].txs_mbuf = NULL;
sc->sc_txsfree = EMAC_TXQUEUELEN;
sc->sc_txsnext = 0;
sc->sc_txsdirty = 0;
/*
* Initialise the receiver descriptor and receive job
* descriptor rings.
*/
for (i = 0; i < EMAC_NRXDESC; i++) {
rxs = &sc->sc_rxsoft[i];
if (rxs->rxs_mbuf == NULL) {
if ((error = emac_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.
*/
emac_rxdrain(sc);
goto out;
}
} else
EMAC_INIT_RXDESC(sc, i);
}
sc->sc_rxptr = 0;
/*
* Set the current media.
*/
if ((error = ether_mediachange(ifp)) != 0)
goto out;
/*
* Give the transmit and receive rings to the MAL.
*/
mtdcr(DCR_MAL0_TXCTP0R, EMAC_CDTXADDR(sc, 0));
mtdcr(DCR_MAL0_RXCTP0R, EMAC_CDRXADDR(sc, 0));
/*
* Load the MAC address.
*/
EMAC_WRITE(sc, EMAC_IAHR, enaddr[0] << 8 | enaddr[1]);
EMAC_WRITE(sc, EMAC_IALR,
enaddr[2] << 24 | enaddr[3] << 16 | enaddr[4] << 8 | enaddr[5]);
/*
* Set the receive channel buffer size (in units of 16 bytes).
*/
#if MCLBYTES > (4096 - 16) /* XXX! */
# error MCLBYTES > max rx channel buffer size
#endif
mtdcr(DCR_MAL0_RCBS0, MCLBYTES / 16);
/* Set fifos, media modes. */
EMAC_WRITE(sc, EMAC_MR1, sc->sc_mr1);
/*
* Enable Individual and (possibly) Broadcast Address modes,
* runt packets, and strip padding.
*/
EMAC_WRITE(sc, EMAC_RMR, RMR_IAE | RMR_RRP | RMR_SP |
(ifp->if_flags & IFF_PROMISC ? RMR_PME : 0) |
(ifp->if_flags & IFF_BROADCAST ? RMR_BAE : 0));
/*
* Set multicast filter.
*/
emac_set_filter(sc);
/*
* Set low- and urgent-priority request thresholds.
*/
EMAC_WRITE(sc, EMAC_TMR1,
((7 << TMR1_TLR_SHIFT) & TMR1_TLR_MASK) | /* 16 word burst */
((15 << TMR1_TUR_SHIFT) & TMR1_TUR_MASK));
/*
* Set Transmit Request Threshold Register.
*/
EMAC_WRITE(sc, EMAC_TRTR, TRTR_256);
/*
* Set high and low receive watermarks.
*/
EMAC_WRITE(sc, EMAC_RWMR,
30 << RWMR_RLWM_SHIFT | 64 << RWMR_RLWM_SHIFT);
/*
* Set frame gap.
*/
EMAC_WRITE(sc, EMAC_IPGVR, 8);
/*
* Set interrupt status enable bits for EMAC and MAL.
*/
EMAC_WRITE(sc, EMAC_ISER,
ISR_BP | ISR_SE | ISR_ALE | ISR_BFCS | ISR_PTLE | ISR_ORE | ISR_IRE);
mtdcr(DCR_MAL0_IER, MAL0_IER_DE | MAL0_IER_NWE | MAL0_IER_TO |
MAL0_IER_OPB | MAL0_IER_PLB);
/*
* Enable the transmit and receive channel on the MAL.
*/
mtdcr(DCR_MAL0_RXCASR, MAL0_RXCASR_CHAN0);
mtdcr(DCR_MAL0_TXCASR, MAL0_TXCASR_CHAN0);
/*
* Enable the transmit and receive channel on the EMAC.
*/
EMAC_WRITE(sc, EMAC_MR0, MR0_TXE | MR0_RXE);
/*
* Start the one second MII clock.
*/
callout_reset(&sc->sc_callout, hz, emac_mii_tick, sc);
/*
* ... all done!
*/
ifp->if_flags |= IFF_RUNNING;
ifp->if_flags &= ~IFF_OACTIVE;
out:
if (error) {
ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
ifp->if_timer = 0;
printf("%s: interface not running\n", sc->sc_dev.dv_xname);
}
return (error);
}
static int
emac_add_rxbuf(struct emac_softc *sc, int idx)
{
struct emac_rxsoft *rxs = &sc->sc_rxsoft[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 (rxs->rxs_mbuf != NULL)
bus_dmamap_unload(sc->sc_dmat, rxs->rxs_dmamap);
rxs->rxs_mbuf = m;
error = bus_dmamap_load(sc->sc_dmat, rxs->rxs_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("emac_add_rxbuf"); /* XXX */
}
bus_dmamap_sync(sc->sc_dmat, rxs->rxs_dmamap, 0,
rxs->rxs_dmamap->dm_mapsize, BUS_DMASYNC_PREREAD);
EMAC_INIT_RXDESC(sc, idx);
return (0);
}
/* ifnet interface function */
static void
emac_watchdog(struct ifnet *ifp)
{
struct emac_softc *sc = ifp->if_softc;
/*
* Since we're not interrupting every packet, sweep
* up before we report an error.
*/
emac_txreap(sc);
if (sc->sc_txfree != EMAC_NTXDESC) {
printf("%s: device timeout (txfree %d txsfree %d txnext %d)\n",
sc->sc_dev.dv_xname, sc->sc_txfree, sc->sc_txsfree,
sc->sc_txnext);
ifp->if_oerrors++;
/* Reset the interface. */
(void)emac_init(ifp);
} else if (ifp->if_flags & IFF_DEBUG)
printf("%s: recovered from device timeout\n",
sc->sc_dev.dv_xname);
/* try to get more packets going */
emac_start(ifp);
}
static void
emac_rxdrain(struct emac_softc *sc)
{
struct emac_rxsoft *rxs;
int i;
for (i = 0; i < EMAC_NRXDESC; i++) {
rxs = &sc->sc_rxsoft[i];
if (rxs->rxs_mbuf != NULL) {
bus_dmamap_unload(sc->sc_dmat, rxs->rxs_dmamap);
m_freem(rxs->rxs_mbuf);
rxs->rxs_mbuf = NULL;
}
}
}
/* ifnet interface function */
static void
emac_stop(struct ifnet *ifp, int disable)
{
struct emac_softc *sc = ifp->if_softc;
struct emac_txsoft *txs;
int i;
/* Stop the one second clock. */
callout_stop(&sc->sc_callout);
/* Down the MII */
mii_down(&sc->sc_mii);
/* Disable interrupts. */
#if 0 /* Can't disable MAL interrupts without a reset... */
EMAC_WRITE(sc, EMAC_ISER, 0);
#endif
mtdcr(DCR_MAL0_IER, 0);
/* Disable the receive and transmit channels. */
mtdcr(DCR_MAL0_RXCARR, MAL0_RXCARR_CHAN0);
mtdcr(DCR_MAL0_TXCARR, MAL0_TXCARR_CHAN0 | MAL0_TXCARR_CHAN1);
/* Disable the transmit enable and receive MACs. */
EMAC_WRITE(sc, EMAC_MR0,
EMAC_READ(sc, EMAC_MR0) & ~(MR0_TXE | MR0_RXE));
/* Release any queued transmit buffers. */
for (i = 0; i < EMAC_TXQUEUELEN; i++) {
txs = &sc->sc_txsoft[i];
if (txs->txs_mbuf != NULL) {
bus_dmamap_unload(sc->sc_dmat, txs->txs_dmamap);
m_freem(txs->txs_mbuf);
txs->txs_mbuf = NULL;
}
}
if (disable)
emac_rxdrain(sc);
/*
* Mark the interface down and cancel the watchdog timer.
*/
ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
ifp->if_timer = 0;
}
/* ifnet interface function */
static int
emac_ioctl(struct ifnet *ifp, u_long cmd, void *data)
{
struct emac_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.
*/
if (ifp->if_flags & IFF_RUNNING)
error = emac_set_filter(sc);
else
error = 0;
}
/* try to get more packets going */
emac_start(ifp);
splx(s);
return (error);
}
static void
emac_reset(struct emac_softc *sc)
{
/* reset the MAL */
mtdcr(DCR_MAL0_CFG, MAL0_CFG_SR);
EMAC_WRITE(sc, EMAC_MR0, MR0_SRST);
delay(5);
/* XXX: check if MR0_SRST is clear until a timeout instead? */
EMAC_WRITE(sc, EMAC_MR0, EMAC_READ(sc, EMAC_MR0) & ~MR0_SRST);
/* XXX clear interrupts in EMAC_ISR just to be sure?? */
/* set the MAL config register */
mtdcr(DCR_MAL0_CFG, MAL0_CFG_PLBB | MAL0_CFG_OPBBL | MAL0_CFG_LEA |
MAL0_CFG_SD | MAL0_CFG_PLBLT);
}
static int
emac_set_filter(struct emac_softc *sc)
{
struct ether_multistep step;
struct ether_multi *enm;
struct ifnet *ifp = &sc->sc_ethercom.ec_if;
uint32_t rmr, crc, gaht[4] = {0, 0, 0, 0};
int category, cnt = 0;
rmr = EMAC_READ(sc, EMAC_RMR);
rmr &= ~(RMR_PMME | RMR_MAE);
ifp->if_flags &= ~IFF_ALLMULTI;
ETHER_FIRST_MULTI(step, &sc->sc_ethercom, enm);
while (enm != NULL) {
if (memcmp(enm->enm_addrlo,
enm->enm_addrhi, ETHER_ADDR_LEN) != 0) {
/*
* 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.)
*/
gaht[0] = gaht[1] = gaht[2] = gaht[3] = 0xffff;
break;
}
crc = ether_crc32_be(enm->enm_addrlo, ETHER_ADDR_LEN);
/* Just want the 6 most significant bits. */
category = crc >> 26;
EMAC_SET_FILTER(gaht, category);
ETHER_NEXT_MULTI(step, enm);
cnt++;
}
if ((gaht[0] & gaht[1] & gaht[2] & gaht[3]) == 0xffff) {
/* All categories are true. */
ifp->if_flags |= IFF_ALLMULTI;
rmr |= RMR_PMME;
} else if (cnt != 0) {
/* Some categories are true. */
EMAC_WRITE(sc, EMAC_GAHT1, gaht[0]);
EMAC_WRITE(sc, EMAC_GAHT2, gaht[1]);
EMAC_WRITE(sc, EMAC_GAHT3, gaht[2]);
EMAC_WRITE(sc, EMAC_GAHT4, gaht[3]);
rmr |= RMR_MAE;
}
EMAC_WRITE(sc, EMAC_RMR, rmr);
return 0;
}
/*
* EMAC General interrupt handler
*/
static int
emac_intr(void *arg)
{
struct emac_softc *sc = arg;
uint32_t status;
EMAC_EVCNT_INCR(&sc->sc_ev_intr);
status = EMAC_READ(sc, EMAC_ISR);
/* Clear the interrupt status bits. */
EMAC_WRITE(sc, EMAC_ISR, status);
return (0);
}
/*
* EMAC Wake-On-LAN interrupt handler
*/
static int
emac_wol_intr(void *arg)
{
struct emac_softc *sc = arg;
EMAC_EVCNT_INCR(&sc->sc_ev_wol);
printf("%s: emac_wol_intr\n", sc->sc_dev.dv_xname);
return (0);
}
/*
* MAL System ERRor interrupt handler
*/
static int
emac_serr_intr(void *arg)
{
#ifdef EMAC_EVENT_COUNTERS
struct emac_softc *sc = arg;
#endif
u_int32_t esr;
EMAC_EVCNT_INCR(&sc->sc_ev_serr);
esr = mfdcr(DCR_MAL0_ESR);
/* Clear the interrupt status bits. */
mtdcr(DCR_MAL0_ESR, esr);
return (0);
}
/*
* MAL Transmit End-Of-Buffer interrupt handler.
* NOTE: This shouldn't be called!
*/
static int
emac_txeob_intr(void *arg)
{
struct emac_softc *sc = arg;
struct ifnet *ifp = &sc->sc_ethercom.ec_if;
int handled;
EMAC_EVCNT_INCR(&sc->sc_ev_txintr);
handled = emac_txreap(arg);
/* try to get more packets going */
emac_start(ifp);
return (handled);
}
/*
* Reap completed Tx descriptors.
*/
static int
emac_txreap(struct emac_softc *sc)
{
struct ifnet *ifp = &sc->sc_ethercom.ec_if;
struct emac_txsoft *txs;
int handled, i;
u_int32_t txstat;
EMAC_EVCNT_INCR(&sc->sc_ev_txreap);
handled = 0;
/* Clear the interrupt */
mtdcr(DCR_MAL0_TXEOBISR, mfdcr(DCR_MAL0_TXEOBISR));
ifp->if_flags &= ~IFF_OACTIVE;
/*
* Go through our Tx list and free mbufs for those
* frames that have been transmitted.
*/
for (i = sc->sc_txsdirty; sc->sc_txsfree != EMAC_TXQUEUELEN;
i = EMAC_NEXTTXS(i), sc->sc_txsfree++) {
txs = &sc->sc_txsoft[i];
EMAC_CDTXSYNC(sc, txs->txs_lastdesc,
txs->txs_dmamap->dm_nsegs,
BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
txstat = sc->sc_txdescs[txs->txs_lastdesc].md_stat_ctrl;
if (txstat & MAL_TX_READY)
break;
handled = 1;
/*
* Check for errors and collisions.
*/
if (txstat & (EMAC_TXS_UR | EMAC_TXS_ED))
ifp->if_oerrors++;
#ifdef EMAC_EVENT_COUNTERS
if (txstat & EMAC_TXS_UR)
EMAC_EVCNT_INCR(&sc->sc_ev_tu);
#endif /* EMAC_EVENT_COUNTERS */
if (txstat & (EMAC_TXS_EC | EMAC_TXS_MC | EMAC_TXS_SC | EMAC_TXS_LC)) {
if (txstat & EMAC_TXS_EC)
ifp->if_collisions += 16;
else if (txstat & EMAC_TXS_MC)
ifp->if_collisions += 2; /* XXX? */
else if (txstat & EMAC_TXS_SC)
ifp->if_collisions++;
if (txstat & EMAC_TXS_LC)
ifp->if_collisions++;
} else
ifp->if_opackets++;
if (ifp->if_flags & IFF_DEBUG) {
if (txstat & EMAC_TXS_ED)
printf("%s: excessive deferral\n",
sc->sc_dev.dv_xname);
if (txstat & EMAC_TXS_EC)
printf("%s: excessive collisions\n",
sc->sc_dev.dv_xname);
}
sc->sc_txfree += txs->txs_ndesc;
bus_dmamap_sync(sc->sc_dmat, txs->txs_dmamap,
0, txs->txs_dmamap->dm_mapsize, BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(sc->sc_dmat, txs->txs_dmamap);
m_freem(txs->txs_mbuf);
txs->txs_mbuf = NULL;
}
/* Update the dirty transmit buffer pointer. */
sc->sc_txsdirty = i;
/*
* If there are no more pending transmissions, cancel the watchdog
* timer.
*/
if (sc->sc_txsfree == EMAC_TXQUEUELEN)
ifp->if_timer = 0;
return (handled);
}
/*
* MAL Receive End-Of-Buffer interrupt handler
*/
static int
emac_rxeob_intr(void *arg)
{
struct emac_softc *sc = arg;
struct ifnet *ifp = &sc->sc_ethercom.ec_if;
struct emac_rxsoft *rxs;
struct mbuf *m;
u_int32_t rxstat;
int i, len;
EMAC_EVCNT_INCR(&sc->sc_ev_rxintr);
/* Clear the interrupt */
mtdcr(DCR_MAL0_RXEOBISR, mfdcr(DCR_MAL0_RXEOBISR));
for (i = sc->sc_rxptr;; i = EMAC_NEXTRX(i)) {
rxs = &sc->sc_rxsoft[i];
EMAC_CDRXSYNC(sc, i,
BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
rxstat = sc->sc_rxdescs[i].md_stat_ctrl;
if (rxstat & MAL_RX_EMPTY)
/*
* We have processed all of the receive buffers.
*/
break;
/*
* If an error occurred, update stats, clear the status
* word, and leave the packet buffer in place. It will
* simply be reused the next time the ring comes around.
*/
if (rxstat & (EMAC_RXS_OE | EMAC_RXS_BP | EMAC_RXS_SE |
EMAC_RXS_AE | EMAC_RXS_BFCS | EMAC_RXS_PTL | EMAC_RXS_ORE |
EMAC_RXS_IRE)) {
#define PRINTERR(bit, str) \
if (rxstat & (bit)) \
printf("%s: receive error: %s\n", \
sc->sc_dev.dv_xname, str)
ifp->if_ierrors++;
PRINTERR(EMAC_RXS_OE, "overrun error");
PRINTERR(EMAC_RXS_BP, "bad packet");
PRINTERR(EMAC_RXS_RP, "runt packet");
PRINTERR(EMAC_RXS_SE, "short event");
PRINTERR(EMAC_RXS_AE, "alignment error");
PRINTERR(EMAC_RXS_BFCS, "bad FCS");
PRINTERR(EMAC_RXS_PTL, "packet too long");
PRINTERR(EMAC_RXS_ORE, "out of range error");
PRINTERR(EMAC_RXS_IRE, "in range error");
#undef PRINTERR
EMAC_INIT_RXDESC(sc, i);
continue;
}
bus_dmamap_sync(sc->sc_dmat, rxs->rxs_dmamap, 0,
rxs->rxs_dmamap->dm_mapsize, BUS_DMASYNC_POSTREAD);
/*
* No errors; receive the packet. Note, the 405GP emac
* includes the CRC with every packet.
*/
len = sc->sc_rxdescs[i].md_data_len - ETHER_CRC_LEN;
/*
* 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 (emac_copy_small != 0 && len <= MHLEN) {
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
goto dropit;
memcpy(mtod(m, void *),
mtod(rxs->rxs_mbuf, void *), len);
EMAC_INIT_RXDESC(sc, i);
bus_dmamap_sync(sc->sc_dmat, rxs->rxs_dmamap, 0,
rxs->rxs_dmamap->dm_mapsize,
BUS_DMASYNC_PREREAD);
} else {
m = rxs->rxs_mbuf;
if (emac_add_rxbuf(sc, i) != 0) {
dropit:
ifp->if_ierrors++;
EMAC_INIT_RXDESC(sc, i);
bus_dmamap_sync(sc->sc_dmat,
rxs->rxs_dmamap, 0,
rxs->rxs_dmamap->dm_mapsize,
BUS_DMASYNC_PREREAD);
continue;
}
}
ifp->if_ipackets++;
m->m_pkthdr.rcvif = ifp;
m->m_pkthdr.len = m->m_len = len;
#if NBPFILTER > 0
/*
* Pass this up to any BPF listeners, but only
* pass if up the stack if it's for us.
*/
if (ifp->if_bpf)
bpf_mtap(ifp->if_bpf, m);
#endif /* NBPFILTER > 0 */
/* Pass it on. */
(*ifp->if_input)(ifp, m);
}
/* Update the receive pointer. */
sc->sc_rxptr = i;
return (0);
}
/*
* MAL Transmit Descriptor Error interrupt handler
*/
static int
emac_txde_intr(void *arg)
{
struct emac_softc *sc = arg;
EMAC_EVCNT_INCR(&sc->sc_ev_txde);
printf("%s: emac_txde_intr\n", sc->sc_dev.dv_xname);
return (0);
}
/*
* MAL Receive Descriptor Error interrupt handler
*/
static int
emac_rxde_intr(void *arg)
{
int i;
struct emac_softc *sc = arg;
EMAC_EVCNT_INCR(&sc->sc_ev_rxde);
printf("%s: emac_rxde_intr\n", sc->sc_dev.dv_xname);
/*
* XXX!
* This is a bit drastic; we just drop all descriptors that aren't
* "clean". We should probably send any that are up the stack.
*/
for (i = 0; i < EMAC_NRXDESC; i++) {
EMAC_CDRXSYNC(sc, i, BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
if (sc->sc_rxdescs[i].md_data_len != MCLBYTES) {
EMAC_INIT_RXDESC(sc, i);
}
}
/* Reenable the receive channel */
mtdcr(DCR_MAL0_RXCASR, MAL0_RXCASR_CHAN0);
/* Clear the interrupt */
mtdcr(DCR_MAL0_RXDEIR, mfdcr(DCR_MAL0_RXDEIR));
return (0);
}
static uint32_t
emac_mii_wait(struct emac_softc *sc)
{
int i;
uint32_t reg;
/* wait for PHY data transfer to complete */
i = 0;
while ((reg = EMAC_READ(sc, EMAC_STACR) & STACR_OC) == 0) {
delay(7);
if (i++ > 5) {
printf("%s: MII timed out\n", sc->sc_dev.dv_xname);
return (0);
}
}
return (reg);
}
static int
emac_mii_readreg(struct device *self, int phy, int reg)
{
struct emac_softc *sc = (struct emac_softc *)self;
uint32_t sta_reg;
/* wait for PHY data transfer to complete */
if (emac_mii_wait(sc) == 0)
return (0);
sta_reg = reg << STACR_PRASHIFT;
sta_reg |= STACR_READ;
sta_reg |= phy << STACR_PCDASHIFT;
sta_reg &= ~STACR_OPBC_MASK;
sta_reg |= STACR_OPBC_50MHZ;
EMAC_WRITE(sc, EMAC_STACR, sta_reg);
if ((sta_reg = emac_mii_wait(sc)) == 0)
return (0);
sta_reg = EMAC_READ(sc, EMAC_STACR);
if ((sta_reg & STACR_PHYE) != 0)
return (0);
return (sta_reg >> STACR_PHYDSHIFT);
}
static void
emac_mii_writereg(struct device *self, int phy, int reg, int val)
{
struct emac_softc *sc = (struct emac_softc *)self;
uint32_t sta_reg;
/* wait for PHY data transfer to complete */
if (emac_mii_wait(sc) == 0)
return;
sta_reg = reg << STACR_PRASHIFT;
sta_reg |= STACR_WRITE;
sta_reg |= phy << STACR_PCDASHIFT;
sta_reg &= ~STACR_OPBC_MASK;
sta_reg |= STACR_OPBC_50MHZ;
sta_reg |= val << STACR_PHYDSHIFT;
EMAC_WRITE(sc, EMAC_STACR, sta_reg);
if ((sta_reg = emac_mii_wait(sc)) == 0)
return;
if ((sta_reg & STACR_PHYE) != 0)
/* error */
return;
}
static void
emac_mii_statchg(struct device *self)
{
struct emac_softc *sc = (void *)self;
if (sc->sc_mii.mii_media_active & IFM_FDX)
sc->sc_mr1 |= MR1_FDE;
else
sc->sc_mr1 &= ~(MR1_FDE | MR1_EIFC);
/* XXX 802.1x flow-control? */
/*
* MR1 can only be written immediately after a reset...
*/
emac_reset(sc);
}
static void
emac_mii_tick(void *arg)
{
struct emac_softc *sc = arg;
int s;
if (!device_is_active(&sc->sc_dev))
return;
s = splnet();
mii_tick(&sc->sc_mii);
splx(s);
callout_reset(&sc->sc_callout, hz, emac_mii_tick, sc);
}