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ccb1212a56
freebsd-skq/sys/dev/gem/if_gem.c
Marius Strobl ccb1212a56 o The FreeBSD bus_dmamap_sync(9) supports ored together flags for quite 
some time now so collapse calls accordingly.
o Given that gem_load_txmbuf() is allowed to fail resulting in a packet
  drop also for quite some time now implement the functionality of
  gem_txcksum() by means of m_pullup(9), which de-obfuscates the code
  and allows to always retrieve the correct length of the IP header.
o Add missing BUS_DMASYNC_PREREAD when syncing the control DMA maps in
  gem_rint() and gem_start_locked().
o Correct some bus_barrier(9) calls to do a read/write barrier as we
  do a read after a write. Add some missing ones in gem_mii_readreg()
  and gem_mii_writereg().
o According to the Apple GMAC driver, the GEM ASIC specification and
  the OpenSolaris eri(7D) the TX FIFO threshold has to be set to 0x4ff
  for the Gigabit variants and 0x100 for the ERI in order do avoid TX
  underruns.
o In gem_init_locked():
  - be conservative and enable the RX and TX MACs,
  - don't clear GEM_LINK otherwise we don't ever mark the link as up
    again if gem_init_locked() is called from gem_watchdog(),
  - remove superfluous setting of sc_ifflags.
o Don't bother to check whether the interface is running or whether its
  queue is empty before calling gem_start_locked() in gem_tint(), the
  former will check these anyway.
o Call gem_start_locked() in gem_watchdog() in order to try to get
  some more packets going.
o In gem_mii_writereg() after reseting the PCS restore its configuration.

GMAC testing:	grehan, marcel
MFC after:	2 weeks
2008-06-22 13:54:51 +00:00

2165 lines
58 KiB
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/*-
* Copyright (C) 2001 Eduardo Horvath.
* Copyright (c) 2001-2003 Thomas Moestl
* Copyright (c) 2007 Marius Strobl <marius@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* from: NetBSD: gem.c,v 1.21 2002/06/01 23:50:58 lukem Exp
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Driver for Apple GMAC, Sun ERI and Sun GEM Ethernet controllers
*/
#if 0
#define GEM_DEBUG
#endif
#if 0 /* XXX: In case of emergency, re-enable this. */
#define GEM_RINT_TIMEOUT
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/callout.h>
#include <sys/endian.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/rman.h>
#include <net/bpf.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_types.h>
#include <net/if_vlan_var.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <machine/bus.h>
#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>
#include <dev/gem/if_gemreg.h>
#include <dev/gem/if_gemvar.h>
CTASSERT(powerof2(GEM_NRXDESC) && GEM_NRXDESC >= 32 && GEM_NRXDESC <= 8192);
CTASSERT(powerof2(GEM_NTXDESC) && GEM_NTXDESC >= 32 && GEM_NTXDESC <= 8192);
#define TRIES 10000
/*
* The GEM hardware support basic TCP/UDP checksum offloading. However,
* the hardware doesn't compensate the checksum for UDP datagram which
* can yield to 0x0. As a safe guard, UDP checksum offload is disabled
* by default. It can be reactivated by setting special link option
* link0 with ifconfig(8).
*/
#define GEM_CSUM_FEATURES (CSUM_TCP)
static int gem_add_rxbuf(struct gem_softc *sc, int idx);
static int gem_bitwait(struct gem_softc *sc, u_int bank, bus_addr_t r,
uint32_t clr, uint32_t set);
static void gem_cddma_callback(void *xsc, bus_dma_segment_t *segs,
int nsegs, int error);
static int gem_disable_rx(struct gem_softc *sc);
static int gem_disable_tx(struct gem_softc *sc);
static void gem_eint(struct gem_softc *sc, u_int status);
static void gem_init(void *xsc);
static void gem_init_locked(struct gem_softc *sc);
static void gem_init_regs(struct gem_softc *sc);
static int gem_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
static int gem_load_txmbuf(struct gem_softc *sc, struct mbuf **m_head);
static int gem_meminit(struct gem_softc *sc);
static void gem_mifinit(struct gem_softc *sc);
static void gem_reset(struct gem_softc *sc);
static int gem_reset_rx(struct gem_softc *sc);
static void gem_reset_rxdma(struct gem_softc *sc);
static int gem_reset_tx(struct gem_softc *sc);
static u_int gem_ringsize(u_int sz);
static void gem_rint(struct gem_softc *sc);
#ifdef GEM_RINT_TIMEOUT
static void gem_rint_timeout(void *arg);
#endif
static __inline void gem_rxcksum(struct mbuf *m, uint64_t flags);
static void gem_rxdrain(struct gem_softc *sc);
static void gem_setladrf(struct gem_softc *sc);
static void gem_start(struct ifnet *ifp);
static void gem_start_locked(struct ifnet *ifp);
static void gem_stop(struct ifnet *ifp, int disable);
static void gem_tick(void *arg);
static void gem_tint(struct gem_softc *sc);
static int gem_watchdog(struct gem_softc *sc);
devclass_t gem_devclass;
DRIVER_MODULE(miibus, gem, miibus_driver, miibus_devclass, 0, 0);
MODULE_DEPEND(gem, miibus, 1, 1, 1);
#ifdef GEM_DEBUG
#include <sys/ktr.h>
#define KTR_GEM KTR_CT2
#endif
#define GEM_BANK1_BITWAIT(sc, r, clr, set) \
gem_bitwait((sc), GEM_RES_BANK1, (r), (clr), (set))
#define GEM_BANK2_BITWAIT(sc, r, clr, set) \
gem_bitwait((sc), GEM_RES_BANK2, (r), (clr), (set))
int
gem_attach(struct gem_softc *sc)
{
struct gem_txsoft *txs;
struct ifnet *ifp;
int error, i;
uint32_t v;
ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
if (ifp == NULL)
return (ENOSPC);
callout_init_mtx(&sc->sc_tick_ch, &sc->sc_mtx, 0);
#ifdef GEM_RINT_TIMEOUT
callout_init_mtx(&sc->sc_rx_ch, &sc->sc_mtx, 0);
#endif
/* Make sure the chip is stopped. */
ifp->if_softc = sc;
gem_reset(sc);
error = bus_dma_tag_create(bus_get_dma_tag(sc->sc_dev), 1, 0,
BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
BUS_SPACE_MAXSIZE_32BIT, 0, BUS_SPACE_MAXSIZE_32BIT, 0, NULL,
NULL, &sc->sc_pdmatag);
if (error)
goto fail_ifnet;
error = bus_dma_tag_create(sc->sc_pdmatag, 1, 0,
BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL, MCLBYTES,
1, MCLBYTES, BUS_DMA_ALLOCNOW, NULL, NULL, &sc->sc_rdmatag);
if (error)
goto fail_ptag;
error = bus_dma_tag_create(sc->sc_pdmatag, 1, 0,
BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
MCLBYTES * GEM_NTXSEGS, GEM_NTXSEGS, MCLBYTES,
BUS_DMA_ALLOCNOW, NULL, NULL, &sc->sc_tdmatag);
if (error)
goto fail_rtag;
error = bus_dma_tag_create(sc->sc_pdmatag, PAGE_SIZE, 0,
BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
sizeof(struct gem_control_data), 1,
sizeof(struct gem_control_data), 0,
NULL, NULL, &sc->sc_cdmatag);
if (error)
goto fail_ttag;
/*
* Allocate the control data structures, create and load the
* DMA map for it.
*/
if ((error = bus_dmamem_alloc(sc->sc_cdmatag,
(void **)&sc->sc_control_data,
BUS_DMA_WAITOK | BUS_DMA_COHERENT | BUS_DMA_ZERO,
&sc->sc_cddmamap))) {
device_printf(sc->sc_dev,
"unable to allocate control data, error = %d\n", error);
goto fail_ctag;
}
sc->sc_cddma = 0;
if ((error = bus_dmamap_load(sc->sc_cdmatag, sc->sc_cddmamap,
sc->sc_control_data, sizeof(struct gem_control_data),
gem_cddma_callback, sc, 0)) != 0 || sc->sc_cddma == 0) {
device_printf(sc->sc_dev,
"unable to load control data DMA map, error = %d\n",
error);
goto fail_cmem;
}
/*
* Initialize the transmit job descriptors.
*/
STAILQ_INIT(&sc->sc_txfreeq);
STAILQ_INIT(&sc->sc_txdirtyq);
/*
* Create the transmit buffer DMA maps.
*/
error = ENOMEM;
for (i = 0; i < GEM_TXQUEUELEN; i++) {
txs = &sc->sc_txsoft[i];
txs->txs_mbuf = NULL;
txs->txs_ndescs = 0;
if ((error = bus_dmamap_create(sc->sc_tdmatag, 0,
&txs->txs_dmamap)) != 0) {
device_printf(sc->sc_dev,
"unable to create TX DMA map %d, error = %d\n",
i, error);
goto fail_txd;
}
STAILQ_INSERT_TAIL(&sc->sc_txfreeq, txs, txs_q);
}
/*
* Create the receive buffer DMA maps.
*/
for (i = 0; i < GEM_NRXDESC; i++) {
if ((error = bus_dmamap_create(sc->sc_rdmatag, 0,
&sc->sc_rxsoft[i].rxs_dmamap)) != 0) {
device_printf(sc->sc_dev,
"unable to create RX DMA map %d, error = %d\n",
i, error);
goto fail_rxd;
}
sc->sc_rxsoft[i].rxs_mbuf = NULL;
}
/* Bad things will happen when touching this register on ERI. */
if (sc->sc_variant != GEM_SUN_ERI)
GEM_BANK1_WRITE_4(sc, GEM_MII_DATAPATH_MODE,
GEM_MII_DATAPATH_MII);
gem_mifinit(sc);
/*
* Look for an external PHY.
*/
error = ENXIO;
v = GEM_BANK1_READ_4(sc, GEM_MIF_CONFIG);
if ((v & GEM_MIF_CONFIG_MDI1) != 0) {
v |= GEM_MIF_CONFIG_PHY_SEL;
GEM_BANK1_WRITE_4(sc, GEM_MIF_CONFIG, v);
switch (sc->sc_variant) {
case GEM_SUN_ERI:
sc->sc_phyad = GEM_PHYAD_EXTERNAL;
break;
default:
sc->sc_phyad = -1;
break;
}
error = mii_phy_probe(sc->sc_dev, &sc->sc_miibus,
gem_mediachange, gem_mediastatus);
}
/*
* Fall back on an internal PHY if no external PHY was found.
*/
if (error != 0 && (v & GEM_MIF_CONFIG_MDI0) != 0) {
v &= ~GEM_MIF_CONFIG_PHY_SEL;
GEM_BANK1_WRITE_4(sc, GEM_MIF_CONFIG, v);
switch (sc->sc_variant) {
case GEM_SUN_ERI:
case GEM_APPLE_K2_GMAC:
sc->sc_phyad = GEM_PHYAD_INTERNAL;
break;
case GEM_APPLE_GMAC:
sc->sc_phyad = GEM_PHYAD_EXTERNAL;
break;
default:
sc->sc_phyad = -1;
break;
}
error = mii_phy_probe(sc->sc_dev, &sc->sc_miibus,
gem_mediachange, gem_mediastatus);
}
/*
* Try the external PCS SERDES if we didn't find any PHYs.
*/
if (error != 0 && sc->sc_variant == GEM_SUN_GEM) {
GEM_BANK1_WRITE_4(sc, GEM_MII_DATAPATH_MODE,
GEM_MII_DATAPATH_SERDES);
GEM_BANK1_WRITE_4(sc, GEM_MII_SLINK_CONTROL,
GEM_MII_SLINK_LOOPBACK | GEM_MII_SLINK_EN_SYNC_D);
GEM_BANK1_WRITE_4(sc, GEM_MII_CONFIG, GEM_MII_CONFIG_ENABLE);
sc->sc_flags |= GEM_SERDES;
sc->sc_phyad = GEM_PHYAD_EXTERNAL;
error = mii_phy_probe(sc->sc_dev, &sc->sc_miibus,
gem_mediachange, gem_mediastatus);
}
if (error != 0) {
device_printf(sc->sc_dev, "PHY probe failed: %d\n", error);
goto fail_rxd;
}
sc->sc_mii = device_get_softc(sc->sc_miibus);
/*
* From this point forward, the attachment cannot fail. A failure
* before this point releases all resources that may have been
* allocated.
*/
/* Get RX FIFO size. */
sc->sc_rxfifosize = 64 *
GEM_BANK1_READ_4(sc, GEM_RX_FIFO_SIZE);
/* Get TX FIFO size. */
v = GEM_BANK1_READ_4(sc, GEM_TX_FIFO_SIZE);
device_printf(sc->sc_dev, "%ukB RX FIFO, %ukB TX FIFO\n",
sc->sc_rxfifosize / 1024, v / 16);
sc->sc_csum_features = GEM_CSUM_FEATURES;
/* Initialize ifnet structure. */
ifp->if_softc = sc;
if_initname(ifp, device_get_name(sc->sc_dev),
device_get_unit(sc->sc_dev));
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_start = gem_start;
ifp->if_ioctl = gem_ioctl;
ifp->if_init = gem_init;
IFQ_SET_MAXLEN(&ifp->if_snd, GEM_TXQUEUELEN);
ifp->if_snd.ifq_drv_maxlen = GEM_TXQUEUELEN;
IFQ_SET_READY(&ifp->if_snd);
/* Attach the interface. */
ether_ifattach(ifp, sc->sc_enaddr);
/*
* Tell the upper layer(s) we support long frames/checksum offloads.
*/
ifp->if_data.ifi_hdrlen = sizeof(struct ether_vlan_header);
ifp->if_capabilities |= IFCAP_VLAN_MTU | IFCAP_HWCSUM;
ifp->if_hwassist |= sc->sc_csum_features;
ifp->if_capenable |= IFCAP_VLAN_MTU | IFCAP_HWCSUM;
return (0);
/*
* Free any resources we've allocated during the failed attach
* attempt. Do this in reverse order and fall through.
*/
fail_rxd:
for (i = 0; i < GEM_NRXDESC; i++)
if (sc->sc_rxsoft[i].rxs_dmamap != NULL)
bus_dmamap_destroy(sc->sc_rdmatag,
sc->sc_rxsoft[i].rxs_dmamap);
fail_txd:
for (i = 0; i < GEM_TXQUEUELEN; i++)
if (sc->sc_txsoft[i].txs_dmamap != NULL)
bus_dmamap_destroy(sc->sc_tdmatag,
sc->sc_txsoft[i].txs_dmamap);
bus_dmamap_unload(sc->sc_cdmatag, sc->sc_cddmamap);
fail_cmem:
bus_dmamem_free(sc->sc_cdmatag, sc->sc_control_data,
sc->sc_cddmamap);
fail_ctag:
bus_dma_tag_destroy(sc->sc_cdmatag);
fail_ttag:
bus_dma_tag_destroy(sc->sc_tdmatag);
fail_rtag:
bus_dma_tag_destroy(sc->sc_rdmatag);
fail_ptag:
bus_dma_tag_destroy(sc->sc_pdmatag);
fail_ifnet:
if_free(ifp);
return (error);
}
void
gem_detach(struct gem_softc *sc)
{
struct ifnet *ifp = sc->sc_ifp;
int i;
GEM_LOCK(sc);
gem_stop(ifp, 1);
GEM_UNLOCK(sc);
callout_drain(&sc->sc_tick_ch);
#ifdef GEM_RINT_TIMEOUT
callout_drain(&sc->sc_rx_ch);
#endif
ether_ifdetach(ifp);
if_free(ifp);
device_delete_child(sc->sc_dev, sc->sc_miibus);
for (i = 0; i < GEM_NRXDESC; i++)
if (sc->sc_rxsoft[i].rxs_dmamap != NULL)
bus_dmamap_destroy(sc->sc_rdmatag,
sc->sc_rxsoft[i].rxs_dmamap);
for (i = 0; i < GEM_TXQUEUELEN; i++)
if (sc->sc_txsoft[i].txs_dmamap != NULL)
bus_dmamap_destroy(sc->sc_tdmatag,
sc->sc_txsoft[i].txs_dmamap);
GEM_CDSYNC(sc, BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(sc->sc_cdmatag, sc->sc_cddmamap);
bus_dmamem_free(sc->sc_cdmatag, sc->sc_control_data,
sc->sc_cddmamap);
bus_dma_tag_destroy(sc->sc_cdmatag);
bus_dma_tag_destroy(sc->sc_tdmatag);
bus_dma_tag_destroy(sc->sc_rdmatag);
bus_dma_tag_destroy(sc->sc_pdmatag);
}
void
gem_suspend(struct gem_softc *sc)
{
struct ifnet *ifp = sc->sc_ifp;
GEM_LOCK(sc);
gem_stop(ifp, 0);
GEM_UNLOCK(sc);
}
void
gem_resume(struct gem_softc *sc)
{
struct ifnet *ifp = sc->sc_ifp;
GEM_LOCK(sc);
/*
* On resume all registers have to be initialized again like
* after power-on.
*/
sc->sc_flags &= ~GEM_INITED;
if (ifp->if_flags & IFF_UP)
gem_init_locked(sc);
GEM_UNLOCK(sc);
}
static __inline void
gem_rxcksum(struct mbuf *m, uint64_t flags)
{
struct ether_header *eh;
struct ip *ip;
struct udphdr *uh;
uint16_t *opts;
int32_t hlen, len, pktlen;
uint32_t temp32;
uint16_t cksum;
pktlen = m->m_pkthdr.len;
if (pktlen < sizeof(struct ether_header) + sizeof(struct ip))
return;
eh = mtod(m, struct ether_header *);
if (eh->ether_type != htons(ETHERTYPE_IP))
return;
ip = (struct ip *)(eh + 1);
if (ip->ip_v != IPVERSION)
return;
hlen = ip->ip_hl << 2;
pktlen -= sizeof(struct ether_header);
if (hlen < sizeof(struct ip))
return;
if (ntohs(ip->ip_len) < hlen)
return;
if (ntohs(ip->ip_len) != pktlen)
return;
if (ip->ip_off & htons(IP_MF | IP_OFFMASK))
return; /* Cannot handle fragmented packet. */
switch (ip->ip_p) {
case IPPROTO_TCP:
if (pktlen < (hlen + sizeof(struct tcphdr)))
return;
break;
case IPPROTO_UDP:
if (pktlen < (hlen + sizeof(struct udphdr)))
return;
uh = (struct udphdr *)((uint8_t *)ip + hlen);
if (uh->uh_sum == 0)
return; /* no checksum */
break;
default:
return;
}
cksum = ~(flags & GEM_RD_CHECKSUM);
/* checksum fixup for IP options */
len = hlen - sizeof(struct ip);
if (len > 0) {
opts = (uint16_t *)(ip + 1);
for (; len > 0; len -= sizeof(uint16_t), opts++) {
temp32 = cksum - *opts;
temp32 = (temp32 >> 16) + (temp32 & 65535);
cksum = temp32 & 65535;
}
}
m->m_pkthdr.csum_flags |= CSUM_DATA_VALID;
m->m_pkthdr.csum_data = cksum;
}
static void
gem_cddma_callback(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
{
struct gem_softc *sc = xsc;
if (error != 0)
return;
if (nsegs != 1)
panic("%s: bad control buffer segment count", __func__);
sc->sc_cddma = segs[0].ds_addr;
}
static void
gem_tick(void *arg)
{
struct gem_softc *sc = arg;
struct ifnet *ifp;
GEM_LOCK_ASSERT(sc, MA_OWNED);
ifp = sc->sc_ifp;
/*
* Unload collision counters.
*/
ifp->if_collisions +=
GEM_BANK1_READ_4(sc, GEM_MAC_NORM_COLL_CNT) +
GEM_BANK1_READ_4(sc, GEM_MAC_FIRST_COLL_CNT) +
GEM_BANK1_READ_4(sc, GEM_MAC_EXCESS_COLL_CNT) +
GEM_BANK1_READ_4(sc, GEM_MAC_LATE_COLL_CNT);
/*
* Then clear the hardware counters.
*/
GEM_BANK1_WRITE_4(sc, GEM_MAC_NORM_COLL_CNT, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_FIRST_COLL_CNT, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_EXCESS_COLL_CNT, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_LATE_COLL_CNT, 0);
mii_tick(sc->sc_mii);
if (gem_watchdog(sc) == EJUSTRETURN)
return;
callout_reset(&sc->sc_tick_ch, hz, gem_tick, sc);
}
static int
gem_bitwait(struct gem_softc *sc, u_int bank, bus_addr_t r, uint32_t clr,
uint32_t set)
{
int i;
uint32_t reg;
for (i = TRIES; i--; DELAY(100)) {
reg = GEM_BANKN_READ_M(bank, 4, sc, r);
if ((reg & clr) == 0 && (reg & set) == set)
return (1);
}
return (0);
}
static void
gem_reset(sc)
struct gem_softc *sc;
{
#ifdef GEM_DEBUG
CTR2(KTR_GEM, "%s: %s", device_get_name(sc->sc_dev), __func__);
#endif
gem_reset_rx(sc);
gem_reset_tx(sc);
/* Do a full reset. */
GEM_BANK2_WRITE_4(sc, GEM_RESET, GEM_RESET_RX | GEM_RESET_TX);
GEM_BANK2_BARRIER(sc, GEM_RESET, 4,
BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
if (!GEM_BANK2_BITWAIT(sc, GEM_RESET, GEM_RESET_RX | GEM_RESET_TX, 0))
device_printf(sc->sc_dev, "cannot reset device\n");
}
static void
gem_rxdrain(struct gem_softc *sc)
{
struct gem_rxsoft *rxs;
int i;
for (i = 0; i < GEM_NRXDESC; i++) {
rxs = &sc->sc_rxsoft[i];
if (rxs->rxs_mbuf != NULL) {
bus_dmamap_sync(sc->sc_rdmatag, rxs->rxs_dmamap,
BUS_DMASYNC_POSTREAD);
bus_dmamap_unload(sc->sc_rdmatag, rxs->rxs_dmamap);
m_freem(rxs->rxs_mbuf);
rxs->rxs_mbuf = NULL;
}
}
}
static void
gem_stop(struct ifnet *ifp, int disable)
{
struct gem_softc *sc = ifp->if_softc;
struct gem_txsoft *txs;
#ifdef GEM_DEBUG
CTR2(KTR_GEM, "%s: %s", device_get_name(sc->sc_dev), __func__);
#endif
callout_stop(&sc->sc_tick_ch);
#ifdef GEM_RINT_TIMEOUT
callout_stop(&sc->sc_rx_ch);
#endif
/* XXX should we reset these instead? */
gem_disable_tx(sc);
gem_disable_rx(sc);
/*
* Release any queued transmit buffers.
*/
while ((txs = STAILQ_FIRST(&sc->sc_txdirtyq)) != NULL) {
STAILQ_REMOVE_HEAD(&sc->sc_txdirtyq, txs_q);
if (txs->txs_ndescs != 0) {
bus_dmamap_sync(sc->sc_tdmatag, txs->txs_dmamap,
BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(sc->sc_tdmatag, txs->txs_dmamap);
if (txs->txs_mbuf != NULL) {
m_freem(txs->txs_mbuf);
txs->txs_mbuf = NULL;
}
}
STAILQ_INSERT_TAIL(&sc->sc_txfreeq, txs, txs_q);
}
if (disable)
gem_rxdrain(sc);
/*
* Mark the interface down and cancel the watchdog timer.
*/
ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
sc->sc_flags &= ~GEM_LINK;
sc->sc_wdog_timer = 0;
}
static int
gem_reset_rx(struct gem_softc *sc)
{
/*
* Resetting while DMA is in progress can cause a bus hang, so we
* disable DMA first.
*/
gem_disable_rx(sc);
GEM_BANK1_WRITE_4(sc, GEM_RX_CONFIG, 0);
GEM_BANK1_BARRIER(sc, GEM_RX_CONFIG, 4,
BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
if (!GEM_BANK1_BITWAIT(sc, GEM_RX_CONFIG, GEM_RX_CONFIG_RXDMA_EN, 0))
device_printf(sc->sc_dev, "cannot disable RX DMA\n");
/* Finally, reset the ERX. */
GEM_BANK2_WRITE_4(sc, GEM_RESET, GEM_RESET_RX);
GEM_BANK2_BARRIER(sc, GEM_RESET, 4,
BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
if (!GEM_BANK2_BITWAIT(sc, GEM_RESET, GEM_RESET_RX | GEM_RESET_TX,
0)) {
device_printf(sc->sc_dev, "cannot reset receiver\n");
return (1);
}
return (0);
}
/*
* Reset the receiver DMA engine.
*
* Intended to be used in case of GEM_INTR_RX_TAG_ERR, GEM_MAC_RX_OVERFLOW
* etc in order to reset the receiver DMA engine only and not do a full
* reset which amongst others also downs the link and clears the FIFOs.
*/
static void
gem_reset_rxdma(struct gem_softc *sc)
{
int i;
if (gem_reset_rx(sc) != 0)
return (gem_init_locked(sc));
for (i = 0; i < GEM_NRXDESC; i++)
if (sc->sc_rxsoft[i].rxs_mbuf != NULL)
GEM_UPDATE_RXDESC(sc, i);
sc->sc_rxptr = 0;
GEM_CDSYNC(sc, BUS_DMASYNC_PREWRITE | BUS_DMASYNC_PREREAD);
/* NOTE: we use only 32-bit DMA addresses here. */
GEM_BANK1_WRITE_4(sc, GEM_RX_RING_PTR_HI, 0);
GEM_BANK1_WRITE_4(sc, GEM_RX_RING_PTR_LO, GEM_CDRXADDR(sc, 0));
GEM_BANK1_WRITE_4(sc, GEM_RX_KICK, GEM_NRXDESC - 4);
GEM_BANK1_WRITE_4(sc, GEM_RX_CONFIG,
gem_ringsize(GEM_NRXDESC /* XXX */) |
((ETHER_HDR_LEN + sizeof(struct ip)) <<
GEM_RX_CONFIG_CXM_START_SHFT) |
(GEM_THRSH_1024 << GEM_RX_CONFIG_FIFO_THRS_SHIFT) |
(2 << GEM_RX_CONFIG_FBOFF_SHFT));
GEM_BANK1_WRITE_4(sc, GEM_RX_BLANKING,
(6 << GEM_RX_BLANKING_TIME_SHIFT) | 6);
GEM_BANK1_WRITE_4(sc, GEM_RX_PAUSE_THRESH,
(3 * sc->sc_rxfifosize / 256) |
((sc->sc_rxfifosize / 256) << 12));
GEM_BANK1_WRITE_4(sc, GEM_RX_CONFIG,
GEM_BANK1_READ_4(sc, GEM_RX_CONFIG) | GEM_RX_CONFIG_RXDMA_EN);
GEM_BANK1_WRITE_4(sc, GEM_MAC_RX_MASK,
GEM_MAC_RX_DONE | GEM_MAC_RX_FRAME_CNT);
GEM_BANK1_WRITE_4(sc, GEM_MAC_RX_CONFIG,
GEM_BANK1_READ_4(sc, GEM_MAC_RX_CONFIG) | GEM_MAC_RX_ENABLE);
}
static int
gem_reset_tx(struct gem_softc *sc)
{
/*
* Resetting while DMA is in progress can cause a bus hang, so we
* disable DMA first.
*/
gem_disable_tx(sc);
GEM_BANK1_WRITE_4(sc, GEM_TX_CONFIG, 0);
GEM_BANK1_BARRIER(sc, GEM_TX_CONFIG, 4,
BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
if (!GEM_BANK1_BITWAIT(sc, GEM_TX_CONFIG, GEM_TX_CONFIG_TXDMA_EN, 0))
device_printf(sc->sc_dev, "cannot disable TX DMA\n");
/* Finally, reset the ETX. */
GEM_BANK2_WRITE_4(sc, GEM_RESET, GEM_RESET_TX);
GEM_BANK2_BARRIER(sc, GEM_RESET, 4,
BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
if (!GEM_BANK2_BITWAIT(sc, GEM_RESET, GEM_RESET_RX | GEM_RESET_TX,
0)) {
device_printf(sc->sc_dev, "cannot reset transmitter\n");
return (1);
}
return (0);
}
static int
gem_disable_rx(struct gem_softc *sc)
{
GEM_BANK1_WRITE_4(sc, GEM_MAC_RX_CONFIG,
GEM_BANK1_READ_4(sc, GEM_MAC_RX_CONFIG) & ~GEM_MAC_RX_ENABLE);
GEM_BANK1_BARRIER(sc, GEM_MAC_RX_CONFIG, 4,
BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
return (GEM_BANK1_BITWAIT(sc, GEM_MAC_RX_CONFIG, GEM_MAC_RX_ENABLE,
0));
}
static int
gem_disable_tx(struct gem_softc *sc)
{
GEM_BANK1_WRITE_4(sc, GEM_MAC_TX_CONFIG,
GEM_BANK1_READ_4(sc, GEM_MAC_TX_CONFIG) & ~GEM_MAC_TX_ENABLE);
GEM_BANK1_BARRIER(sc, GEM_MAC_TX_CONFIG, 4,
BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
return (GEM_BANK1_BITWAIT(sc, GEM_MAC_TX_CONFIG, GEM_MAC_TX_ENABLE,
0));
}
static int
gem_meminit(sc)
struct gem_softc *sc;
{
struct gem_rxsoft *rxs;
int error, i;
/*
* Initialize the transmit descriptor ring.
*/
for (i = 0; i < GEM_NTXDESC; i++) {
sc->sc_txdescs[i].gd_flags = 0;
sc->sc_txdescs[i].gd_addr = 0;
}
sc->sc_txfree = GEM_MAXTXFREE;
sc->sc_txnext = 0;
sc->sc_txwin = 0;
/*
* Initialize the receive descriptor and receive job
* descriptor rings.
*/
for (i = 0; i < GEM_NRXDESC; i++) {
rxs = &sc->sc_rxsoft[i];
if (rxs->rxs_mbuf == NULL) {
if ((error = gem_add_rxbuf(sc, i)) != 0) {
device_printf(sc->sc_dev,
"unable to allocate or map RX buffer %d, "
"error = %d\n", i, error);
/*
* XXX we should attempt to run with fewer
* receive buffers instead of just failing.
*/
gem_rxdrain(sc);
return (1);
}
} else
GEM_INIT_RXDESC(sc, i);
}
sc->sc_rxptr = 0;
GEM_CDSYNC(sc, BUS_DMASYNC_PREWRITE | BUS_DMASYNC_PREREAD);
return (0);
}
static u_int
gem_ringsize(u_int sz)
{
switch (sz) {
case 32:
return (GEM_RING_SZ_32);
case 64:
return (GEM_RING_SZ_64);
case 128:
return (GEM_RING_SZ_128);
case 256:
return (GEM_RING_SZ_256);
case 512:
return (GEM_RING_SZ_512);
case 1024:
return (GEM_RING_SZ_1024);
case 2048:
return (GEM_RING_SZ_2048);
case 4096:
return (GEM_RING_SZ_4096);
case 8192:
return (GEM_RING_SZ_8192);
default:
printf("%s: invalid ring size %d\n", __func__, sz);
return (GEM_RING_SZ_32);
}
}
static void
gem_init(void *xsc)
{
struct gem_softc *sc = xsc;
GEM_LOCK(sc);
gem_init_locked(sc);
GEM_UNLOCK(sc);
}
/*
* Initialization of interface; set up initialization block
* and transmit/receive descriptor rings.
*/
static void
gem_init_locked(struct gem_softc *sc)
{
struct ifnet *ifp = sc->sc_ifp;
uint32_t v;
GEM_LOCK_ASSERT(sc, MA_OWNED);
#ifdef GEM_DEBUG
CTR2(KTR_GEM, "%s: %s: calling stop", device_get_name(sc->sc_dev),
__func__);
#endif
/*
* Initialization sequence. The numbered steps below correspond
* to the sequence outlined in section 6.3.5.1 in the Ethernet
* Channel Engine manual (part of the PCIO manual).
* See also the STP2002-STQ document from Sun Microsystems.
*/
/* step 1 & 2. Reset the Ethernet Channel. */
gem_stop(ifp, 0);
gem_reset(sc);
#ifdef GEM_DEBUG
CTR2(KTR_GEM, "%s: %s: restarting", device_get_name(sc->sc_dev),
__func__);
#endif
/* Re-initialize the MIF. */
gem_mifinit(sc);
/* step 3. Setup data structures in host memory. */
if (gem_meminit(sc) != 0)
return;
/* step 4. TX MAC registers & counters */
gem_init_regs(sc);
/* step 5. RX MAC registers & counters */
gem_setladrf(sc);
/* step 6 & 7. Program Descriptor Ring Base Addresses. */
/* NOTE: we use only 32-bit DMA addresses here. */
GEM_BANK1_WRITE_4(sc, GEM_TX_RING_PTR_HI, 0);
GEM_BANK1_WRITE_4(sc, GEM_TX_RING_PTR_LO, GEM_CDTXADDR(sc, 0));
GEM_BANK1_WRITE_4(sc, GEM_RX_RING_PTR_HI, 0);
GEM_BANK1_WRITE_4(sc, GEM_RX_RING_PTR_LO, GEM_CDRXADDR(sc, 0));
#ifdef GEM_DEBUG
CTR3(KTR_GEM, "loading RX ring %lx, TX ring %lx, cddma %lx",
GEM_CDRXADDR(sc, 0), GEM_CDTXADDR(sc, 0), sc->sc_cddma);
#endif
/* step 8. Global Configuration & Interrupt Mask */
GEM_BANK1_WRITE_4(sc, GEM_INTMASK,
~(GEM_INTR_TX_INTME | GEM_INTR_TX_EMPTY | GEM_INTR_RX_DONE |
GEM_INTR_RX_NOBUF | GEM_INTR_RX_TAG_ERR | GEM_INTR_PERR |
GEM_INTR_BERR
#ifdef GEM_DEBUG
| GEM_INTR_PCS | GEM_INTR_MIF
#endif
));
GEM_BANK1_WRITE_4(sc, GEM_MAC_RX_MASK,
GEM_MAC_RX_DONE | GEM_MAC_RX_FRAME_CNT);
GEM_BANK1_WRITE_4(sc, GEM_MAC_TX_MASK,
GEM_MAC_TX_XMIT_DONE | GEM_MAC_TX_DEFER_EXP);
#ifdef GEM_DEBUG
GEM_BANK1_WRITE_4(sc, GEM_MAC_CONTROL_MASK,
~(GEM_MAC_PAUSED | GEM_MAC_PAUSE | GEM_MAC_RESUME));
#else
GEM_BANK1_WRITE_4(sc, GEM_MAC_CONTROL_MASK,
GEM_MAC_PAUSED | GEM_MAC_PAUSE | GEM_MAC_RESUME);
#endif
/* step 9. ETX Configuration: use mostly default values. */
/* Enable DMA. */
v = gem_ringsize(GEM_NTXDESC /* XXX */);
v |= ((sc->sc_variant == GEM_SUN_ERI ? 0x100 : 0x4ff) << 10) &
GEM_TX_CONFIG_TXFIFO_TH;
GEM_BANK1_WRITE_4(sc, GEM_TX_CONFIG, v | GEM_TX_CONFIG_TXDMA_EN);
/* step 10. ERX Configuration */
/* Encode Receive Descriptor ring size. */
v = gem_ringsize(GEM_NRXDESC /* XXX */);
/* RX TCP/UDP checksum offset */
v |= ((ETHER_HDR_LEN + sizeof(struct ip)) <<
GEM_RX_CONFIG_CXM_START_SHFT);
/* Enable DMA. */
GEM_BANK1_WRITE_4(sc, GEM_RX_CONFIG,
v | (GEM_THRSH_1024 << GEM_RX_CONFIG_FIFO_THRS_SHIFT) |
(2 << GEM_RX_CONFIG_FBOFF_SHFT) | GEM_RX_CONFIG_RXDMA_EN);
GEM_BANK1_WRITE_4(sc, GEM_RX_BLANKING,
(6 << GEM_RX_BLANKING_TIME_SHIFT) | 6);
/*
* The following value is for an OFF Threshold of about 3/4 full
* and an ON Threshold of 1/4 full.
*/
GEM_BANK1_WRITE_4(sc, GEM_RX_PAUSE_THRESH,
(3 * sc->sc_rxfifosize / 256) |
((sc->sc_rxfifosize / 256) << 12));
/* step 11. Configure Media. */
/* step 12. RX_MAC Configuration Register */
v = GEM_BANK1_READ_4(sc, GEM_MAC_RX_CONFIG);
v |= GEM_MAC_RX_ENABLE | GEM_MAC_RX_STRIP_CRC;
GEM_BANK1_WRITE_4(sc, GEM_MAC_RX_CONFIG, 0);
GEM_BANK1_BARRIER(sc, GEM_MAC_RX_CONFIG, 4,
BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
if (!GEM_BANK1_BITWAIT(sc, GEM_MAC_RX_CONFIG, GEM_MAC_RX_ENABLE, 0))
device_printf(sc->sc_dev, "cannot configure RX MAC\n");
GEM_BANK1_WRITE_4(sc, GEM_MAC_RX_CONFIG, v);
/* step 13. TX_MAC Configuration Register */
v = GEM_BANK1_READ_4(sc, GEM_MAC_TX_CONFIG);
v |= GEM_MAC_TX_ENABLE;
GEM_BANK1_WRITE_4(sc, GEM_MAC_TX_CONFIG, 0);
GEM_BANK1_BARRIER(sc, GEM_MAC_TX_CONFIG, 4,
BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
if (!GEM_BANK1_BITWAIT(sc, GEM_MAC_TX_CONFIG, GEM_MAC_TX_ENABLE, 0))
device_printf(sc->sc_dev, "cannot configure TX MAC\n");
GEM_BANK1_WRITE_4(sc, GEM_MAC_TX_CONFIG, v);
/* step 14. Issue Transmit Pending command. */
/* step 15. Give the reciever a swift kick. */
GEM_BANK1_WRITE_4(sc, GEM_RX_KICK, GEM_NRXDESC - 4);
ifp->if_drv_flags |= IFF_DRV_RUNNING;
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
mii_mediachg(sc->sc_mii);
/* Start the one second timer. */
sc->sc_wdog_timer = 0;
callout_reset(&sc->sc_tick_ch, hz, gem_tick, sc);
}
static int
gem_load_txmbuf(struct gem_softc *sc, struct mbuf **m_head)
{
bus_dma_segment_t txsegs[GEM_NTXSEGS];
struct gem_txsoft *txs;
struct ip *ip;
struct mbuf *m;
uint64_t cflags, flags;
int error, nexttx, nsegs, offset, seg;
/* Get a work queue entry. */
if ((txs = STAILQ_FIRST(&sc->sc_txfreeq)) == NULL) {
/* Ran out of descriptors. */
return (ENOBUFS);
}
cflags = 0;
if (((*m_head)->m_pkthdr.csum_flags & sc->sc_csum_features) != 0) {
if (M_WRITABLE(*m_head) == 0) {
m = m_dup(*m_head, M_DONTWAIT);
m_freem(*m_head);
*m_head = m;
if (m == NULL)
return (ENOBUFS);
}
offset = sizeof(struct ether_header);
m = m_pullup(*m_head, offset + sizeof(struct ip));
if (m == NULL) {
*m_head = NULL;
return (ENOBUFS);
}
ip = (struct ip *)(mtod(m, caddr_t) + offset);
offset += (ip->ip_hl << 2);
cflags = offset << GEM_TD_CXSUM_STARTSHFT |
((offset + m->m_pkthdr.csum_data) <<
GEM_TD_CXSUM_STUFFSHFT) | GEM_TD_CXSUM_ENABLE;
*m_head = m;
}
error = bus_dmamap_load_mbuf_sg(sc->sc_tdmatag, txs->txs_dmamap,
*m_head, txsegs, &nsegs, BUS_DMA_NOWAIT);
if (error == EFBIG) {
m = m_collapse(*m_head, M_DONTWAIT, GEM_NTXSEGS);
if (m == NULL) {
m_freem(*m_head);
*m_head = NULL;
return (ENOBUFS);
}
*m_head = m;
error = bus_dmamap_load_mbuf_sg(sc->sc_tdmatag,
txs->txs_dmamap, *m_head, txsegs, &nsegs,
BUS_DMA_NOWAIT);
if (error != 0) {
m_freem(*m_head);
*m_head = NULL;
return (error);
}
} else if (error != 0)
return (error);
/* If nsegs is wrong then the stack is corrupt. */
KASSERT(nsegs <= GEM_NTXSEGS,
("%s: too many DMA segments (%d)", __func__, nsegs));
if (nsegs == 0) {
m_freem(*m_head);
*m_head = NULL;
return (EIO);
}
/*
* Ensure we have enough descriptors free to describe
* the packet. Note, we always reserve one descriptor
* at the end of the ring as a termination point, in
* order to prevent wrap-around.
*/
if (nsegs > sc->sc_txfree - 1) {
txs->txs_ndescs = 0;
bus_dmamap_unload(sc->sc_tdmatag, txs->txs_dmamap);
return (ENOBUFS);
}
txs->txs_ndescs = nsegs;
txs->txs_firstdesc = sc->sc_txnext;
nexttx = txs->txs_firstdesc;
for (seg = 0; seg < nsegs; seg++, nexttx = GEM_NEXTTX(nexttx)) {
#ifdef GEM_DEBUG
CTR6(KTR_GEM,
"%s: mapping seg %d (txd %d), len %lx, addr %#lx (%#lx)",
__func__, seg, nexttx, txsegs[seg].ds_len,
txsegs[seg].ds_addr,
GEM_DMA_WRITE(sc, txsegs[seg].ds_addr));
#endif
sc->sc_txdescs[nexttx].gd_addr =
GEM_DMA_WRITE(sc, txsegs[seg].ds_addr);
KASSERT(txsegs[seg].ds_len < GEM_TD_BUFSIZE,
("%s: segment size too large!", __func__));
flags = txsegs[seg].ds_len & GEM_TD_BUFSIZE;
sc->sc_txdescs[nexttx].gd_flags =
GEM_DMA_WRITE(sc, flags | cflags);
txs->txs_lastdesc = nexttx;
}
/* Set EOP on the last descriptor. */
#ifdef GEM_DEBUG
CTR3(KTR_GEM, "%s: end of packet at segment %d, TX %d",
__func__, seg, nexttx);
#endif
sc->sc_txdescs[txs->txs_lastdesc].gd_flags |=
GEM_DMA_WRITE(sc, GEM_TD_END_OF_PACKET);
/* Lastly set SOP on the first descriptor. */
#ifdef GEM_DEBUG
CTR3(KTR_GEM, "%s: start of packet at segment %d, TX %d",
__func__, seg, nexttx);
#endif
if (++sc->sc_txwin > GEM_NTXSEGS * 2 / 3) {
sc->sc_txwin = 0;
flags |= GEM_TD_INTERRUPT_ME;
sc->sc_txdescs[txs->txs_firstdesc].gd_flags |=
GEM_DMA_WRITE(sc, GEM_TD_INTERRUPT_ME |
GEM_TD_START_OF_PACKET);
} else
sc->sc_txdescs[txs->txs_firstdesc].gd_flags |=
GEM_DMA_WRITE(sc, GEM_TD_START_OF_PACKET);
/* Sync the DMA map. */
bus_dmamap_sync(sc->sc_tdmatag, txs->txs_dmamap,
BUS_DMASYNC_PREWRITE);
#ifdef GEM_DEBUG
CTR4(KTR_GEM, "%s: setting firstdesc=%d, lastdesc=%d, ndescs=%d",
__func__, txs->txs_firstdesc, txs->txs_lastdesc,
txs->txs_ndescs);
#endif
STAILQ_REMOVE_HEAD(&sc->sc_txfreeq, txs_q);
STAILQ_INSERT_TAIL(&sc->sc_txdirtyq, txs, txs_q);
txs->txs_mbuf = *m_head;
sc->sc_txnext = GEM_NEXTTX(txs->txs_lastdesc);
sc->sc_txfree -= txs->txs_ndescs;
return (0);
}
static void
gem_init_regs(struct gem_softc *sc)
{
const u_char *laddr = IF_LLADDR(sc->sc_ifp);
/* These registers are not cleared on reset. */
if ((sc->sc_flags & GEM_INITED) == 0) {
/* magic values */
GEM_BANK1_WRITE_4(sc, GEM_MAC_IPG0, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_IPG1, 8);
GEM_BANK1_WRITE_4(sc, GEM_MAC_IPG2, 4);
GEM_BANK1_WRITE_4(sc, GEM_MAC_MAC_MIN_FRAME, ETHER_MIN_LEN);
/* max frame and max burst size */
GEM_BANK1_WRITE_4(sc, GEM_MAC_MAC_MAX_FRAME,
(ETHER_MAX_LEN + ETHER_VLAN_ENCAP_LEN) | (0x2000 << 16));
GEM_BANK1_WRITE_4(sc, GEM_MAC_PREAMBLE_LEN, 0x7);
GEM_BANK1_WRITE_4(sc, GEM_MAC_JAM_SIZE, 0x4);
GEM_BANK1_WRITE_4(sc, GEM_MAC_ATTEMPT_LIMIT, 0x10);
/* dunno... */
GEM_BANK1_WRITE_4(sc, GEM_MAC_CONTROL_TYPE, 0x8088);
GEM_BANK1_WRITE_4(sc, GEM_MAC_RANDOM_SEED,
((laddr[5] << 8) | laddr[4]) & 0x3ff);
/* secondary MAC address: 0:0:0:0:0:0 */
GEM_BANK1_WRITE_4(sc, GEM_MAC_ADDR3, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_ADDR4, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_ADDR5, 0);
/* MAC control address: 01:80:c2:00:00:01 */
GEM_BANK1_WRITE_4(sc, GEM_MAC_ADDR6, 0x0001);
GEM_BANK1_WRITE_4(sc, GEM_MAC_ADDR7, 0xc200);
GEM_BANK1_WRITE_4(sc, GEM_MAC_ADDR8, 0x0180);
/* MAC filter address: 0:0:0:0:0:0 */
GEM_BANK1_WRITE_4(sc, GEM_MAC_ADDR_FILTER0, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_ADDR_FILTER1, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_ADDR_FILTER2, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_ADR_FLT_MASK1_2, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_ADR_FLT_MASK0, 0);
sc->sc_flags |= GEM_INITED;
}
/* Counters need to be zeroed. */
GEM_BANK1_WRITE_4(sc, GEM_MAC_NORM_COLL_CNT, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_FIRST_COLL_CNT, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_EXCESS_COLL_CNT, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_LATE_COLL_CNT, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_DEFER_TMR_CNT, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_PEAK_ATTEMPTS, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_RX_FRAME_COUNT, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_RX_LEN_ERR_CNT, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_RX_ALIGN_ERR, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_RX_CRC_ERR_CNT, 0);
GEM_BANK1_WRITE_4(sc, GEM_MAC_RX_CODE_VIOL, 0);
/* Set XOFF PAUSE time. */
GEM_BANK1_WRITE_4(sc, GEM_MAC_SEND_PAUSE_CMD, 0x1BF0);
/*
* Set the internal arbitration to "infinite" bursts of the
* maximum length of 31 * 64 bytes so DMA transfers aren't
* split up in cache line size chunks. This greatly improves
* especially RX performance.
* Enable silicon bug workarounds for the Apple variants.
*/
GEM_BANK1_WRITE_4(sc, GEM_CONFIG,
GEM_CONFIG_TXDMA_LIMIT | GEM_CONFIG_RXDMA_LIMIT |
GEM_CONFIG_BURST_INF | (GEM_IS_APPLE(sc) ?
GEM_CONFIG_RONPAULBIT | GEM_CONFIG_BUG2FIX : 0));
/* Set the station address. */
GEM_BANK1_WRITE_4(sc, GEM_MAC_ADDR0, (laddr[4] << 8) | laddr[5]);
GEM_BANK1_WRITE_4(sc, GEM_MAC_ADDR1, (laddr[2] << 8) | laddr[3]);
GEM_BANK1_WRITE_4(sc, GEM_MAC_ADDR2, (laddr[0] << 8) | laddr[1]);
/* Enable MII outputs. */
GEM_BANK1_WRITE_4(sc, GEM_MAC_XIF_CONFIG, GEM_MAC_XIF_TX_MII_ENA);
}
static void
gem_start(struct ifnet *ifp)
{
struct gem_softc *sc = ifp->if_softc;
GEM_LOCK(sc);
gem_start_locked(ifp);
GEM_UNLOCK(sc);
}
static void
gem_start_locked(struct ifnet *ifp)
{
struct gem_softc *sc = ifp->if_softc;
struct mbuf *m;
int ntx;
if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
IFF_DRV_RUNNING || (sc->sc_flags & GEM_LINK) == 0)
return;
#ifdef GEM_DEBUG
CTR4(KTR_GEM, "%s: %s: txfree %d, txnext %d",
device_get_name(sc->sc_dev), __func__, sc->sc_txfree,
sc->sc_txnext);
#endif
ntx = 0;
for (; !IFQ_DRV_IS_EMPTY(&ifp->if_snd) && sc->sc_txfree > 1;) {
IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
if (m == NULL)
break;
if (gem_load_txmbuf(sc, &m) != 0) {
if (m == NULL)
break;
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
IFQ_DRV_PREPEND(&ifp->if_snd, m);
break;
}
ntx++;
/* Kick the transmitter. */
#ifdef GEM_DEBUG
CTR3(KTR_GEM, "%s: %s: kicking TX %d",
device_get_name(sc->sc_dev), __func__, sc->sc_txnext);
#endif
GEM_CDSYNC(sc, BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
GEM_BANK1_WRITE_4(sc, GEM_TX_KICK, sc->sc_txnext);
BPF_MTAP(ifp, m);
}
if (ntx > 0) {
#ifdef GEM_DEBUG
CTR2(KTR_GEM, "%s: packets enqueued, OWN on %d",
device_get_name(sc->sc_dev), sc->sc_txnext);
#endif
/* Set a watchdog timer in case the chip flakes out. */
sc->sc_wdog_timer = 5;
#ifdef GEM_DEBUG
CTR3(KTR_GEM, "%s: %s: watchdog %d",
device_get_name(sc->sc_dev), __func__,
sc->sc_wdog_timer);
#endif
}
}
static void
gem_tint(struct gem_softc *sc)
{
struct ifnet *ifp = sc->sc_ifp;
struct gem_txsoft *txs;
int txlast, progress;
#ifdef GEM_DEBUG
int i;
CTR2(KTR_GEM, "%s: %s", device_get_name(sc->sc_dev), __func__);
#endif
/*
* Go through our TX list and free mbufs for those
* frames that have been transmitted.
*/
progress = 0;
GEM_CDSYNC(sc, BUS_DMASYNC_POSTREAD);
while ((txs = STAILQ_FIRST(&sc->sc_txdirtyq)) != NULL) {
#ifdef GEM_DEBUG
if ((ifp->if_flags & IFF_DEBUG) != 0) {
printf(" txsoft %p transmit chain:\n", txs);
for (i = txs->txs_firstdesc;; i = GEM_NEXTTX(i)) {
printf("descriptor %d: ", i);
printf("gd_flags: 0x%016llx\t",
(long long)GEM_DMA_READ(sc,
sc->sc_txdescs[i].gd_flags));
printf("gd_addr: 0x%016llx\n",
(long long)GEM_DMA_READ(sc,
sc->sc_txdescs[i].gd_addr));
if (i == txs->txs_lastdesc)
break;
}
}
#endif
/*
* In theory, we could harvest some descriptors before
* the ring is empty, but that's a bit complicated.
*
* GEM_TX_COMPLETION points to the last descriptor
* processed + 1.
*/
txlast = GEM_BANK1_READ_4(sc, GEM_TX_COMPLETION);
#ifdef GEM_DEBUG
CTR4(KTR_GEM, "%s: txs->txs_firstdesc = %d, "
"txs->txs_lastdesc = %d, txlast = %d",
__func__, txs->txs_firstdesc, txs->txs_lastdesc, txlast);
#endif
if (txs->txs_firstdesc <= txs->txs_lastdesc) {
if ((txlast >= txs->txs_firstdesc) &&
(txlast <= txs->txs_lastdesc))
break;
} else {
/* Ick -- this command wraps. */
if ((txlast >= txs->txs_firstdesc) ||
(txlast <= txs->txs_lastdesc))
break;
}
#ifdef GEM_DEBUG
CTR1(KTR_GEM, "%s: releasing a descriptor", __func__);
#endif
STAILQ_REMOVE_HEAD(&sc->sc_txdirtyq, txs_q);
sc->sc_txfree += txs->txs_ndescs;
bus_dmamap_sync(sc->sc_tdmatag, txs->txs_dmamap,
BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(sc->sc_tdmatag, txs->txs_dmamap);
if (txs->txs_mbuf != NULL) {
m_freem(txs->txs_mbuf);
txs->txs_mbuf = NULL;
}
STAILQ_INSERT_TAIL(&sc->sc_txfreeq, txs, txs_q);
ifp->if_opackets++;
progress = 1;
}
#ifdef GEM_DEBUG
CTR4(KTR_GEM, "%s: GEM_TX_STATE_MACHINE %x GEM_TX_DATA_PTR %llx "
"GEM_TX_COMPLETION %x",
__func__, GEM_BANK1_READ_4(sc, GEM_TX_STATE_MACHINE),
((long long)GEM_BANK1_READ_4(sc, GEM_TX_DATA_PTR_HI) << 32) |
GEM_BANK1_READ_4(sc, GEM_TX_DATA_PTR_LO),
GEM_BANK1_READ_4(sc, GEM_TX_COMPLETION));
#endif
if (progress) {
if (sc->sc_txfree == GEM_NTXDESC - 1)
sc->sc_txwin = 0;
/*
* We freed some descriptors, so reset IFF_DRV_OACTIVE
* and restart.
*/
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
sc->sc_wdog_timer = STAILQ_EMPTY(&sc->sc_txdirtyq) ? 0 : 5;
gem_start_locked(ifp);
}
#ifdef GEM_DEBUG
CTR3(KTR_GEM, "%s: %s: watchdog %d",
device_get_name(sc->sc_dev), __func__, sc->sc_wdog_timer);
#endif
}
#ifdef GEM_RINT_TIMEOUT
static void
gem_rint_timeout(void *arg)
{
struct gem_softc *sc = arg;
GEM_LOCK_ASSERT(sc, MA_OWNED);
gem_rint(sc);
}
#endif
static void
gem_rint(struct gem_softc *sc)
{
struct ifnet *ifp = sc->sc_ifp;
struct mbuf *m;
uint64_t rxstat;
uint32_t rxcomp;
#ifdef GEM_RINT_TIMEOUT
callout_stop(&sc->sc_rx_ch);
#endif
#ifdef GEM_DEBUG
CTR2(KTR_GEM, "%s: %s", device_get_name(sc->sc_dev), __func__);
#endif
/*
* Read the completion register once. This limits
* how long the following loop can execute.
*/
rxcomp = GEM_BANK1_READ_4(sc, GEM_RX_COMPLETION);
#ifdef GEM_DEBUG
CTR3(KTR_GEM, "%s: sc->rxptr %d, complete %d",
__func__, sc->sc_rxptr, rxcomp);
#endif
GEM_CDSYNC(sc, BUS_DMASYNC_POSTREAD);
for (; sc->sc_rxptr != rxcomp;) {
m = sc->sc_rxsoft[sc->sc_rxptr].rxs_mbuf;
rxstat = GEM_DMA_READ(sc,
sc->sc_rxdescs[sc->sc_rxptr].gd_flags);
if (rxstat & GEM_RD_OWN) {
#ifdef GEM_RINT_TIMEOUT
/*
* The descriptor is still marked as owned, although
* it is supposed to have completed. This has been
* observed on some machines. Just exiting here
* might leave the packet sitting around until another
* one arrives to trigger a new interrupt, which is
* generally undesirable, so set up a timeout.
*/
callout_reset(&sc->sc_rx_ch, GEM_RXOWN_TICKS,
gem_rint_timeout, sc);
#endif
m = NULL;
goto kickit;
}
if (rxstat & GEM_RD_BAD_CRC) {
ifp->if_ierrors++;
device_printf(sc->sc_dev, "receive error: CRC error\n");
GEM_INIT_RXDESC(sc, sc->sc_rxptr);
m = NULL;
goto kickit;
}
#ifdef GEM_DEBUG
if ((ifp->if_flags & IFF_DEBUG) != 0) {
printf(" rxsoft %p descriptor %d: ",
&sc->sc_rxsoft[sc->sc_rxptr], sc->sc_rxptr);
printf("gd_flags: 0x%016llx\t",
(long long)GEM_DMA_READ(sc,
sc->sc_rxdescs[sc->sc_rxptr].gd_flags));
printf("gd_addr: 0x%016llx\n",
(long long)GEM_DMA_READ(sc,
sc->sc_rxdescs[sc->sc_rxptr].gd_addr));
}
#endif
/*
* Allocate a new mbuf cluster. If that fails, we are
* out of memory, and must drop the packet and recycle
* the buffer that's already attached to this descriptor.
*/
if (gem_add_rxbuf(sc, sc->sc_rxptr) != 0) {
ifp->if_ierrors++;
GEM_INIT_RXDESC(sc, sc->sc_rxptr);
m = NULL;
}
kickit:
/*
* Update the RX kick register. This register has to point
* to the descriptor after the last valid one (before the
* current batch) and must be incremented in multiples of
* 4 (because the DMA engine fetches/updates descriptors
* in batches of 4).
*/
sc->sc_rxptr = GEM_NEXTRX(sc->sc_rxptr);
if ((sc->sc_rxptr % 4) == 0) {
GEM_CDSYNC(sc,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
GEM_BANK1_WRITE_4(sc, GEM_RX_KICK,
(sc->sc_rxptr + GEM_NRXDESC - 4) &
GEM_NRXDESC_MASK);
}
if (m == NULL) {
if (rxstat & GEM_RD_OWN)
break;
continue;
}
ifp->if_ipackets++;
m->m_data += 2; /* We're already off by two */
m->m_pkthdr.rcvif = ifp;
m->m_pkthdr.len = m->m_len = GEM_RD_BUFLEN(rxstat);
if ((ifp->if_capenable & IFCAP_RXCSUM) != 0)
gem_rxcksum(m, rxstat);
/* Pass it on. */
GEM_UNLOCK(sc);
(*ifp->if_input)(ifp, m);
GEM_LOCK(sc);
}
#ifdef GEM_DEBUG
CTR3(KTR_GEM, "%s: done sc->rxptr %d, complete %d", __func__,
sc->sc_rxptr, GEM_BANK1_READ_4(sc, GEM_RX_COMPLETION));
#endif
}
static int
gem_add_rxbuf(struct gem_softc *sc, int idx)
{
struct gem_rxsoft *rxs = &sc->sc_rxsoft[idx];
struct mbuf *m;
bus_dma_segment_t segs[1];
int error, nsegs;
m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
if (m == NULL)
return (ENOBUFS);
m->m_len = m->m_pkthdr.len = m->m_ext.ext_size;
#ifdef GEM_DEBUG
/* Bzero the packet to check DMA. */
memset(m->m_ext.ext_buf, 0, m->m_ext.ext_size);
#endif
if (rxs->rxs_mbuf != NULL) {
bus_dmamap_sync(sc->sc_rdmatag, rxs->rxs_dmamap,
BUS_DMASYNC_POSTREAD);
bus_dmamap_unload(sc->sc_rdmatag, rxs->rxs_dmamap);
}
error = bus_dmamap_load_mbuf_sg(sc->sc_rdmatag, rxs->rxs_dmamap,
m, segs, &nsegs, BUS_DMA_NOWAIT);
if (error != 0) {
device_printf(sc->sc_dev,
"cannot load RS DMA map %d, error = %d\n", idx, error);
m_freem(m);
return (error);
}
/* If nsegs is wrong then the stack is corrupt. */
KASSERT(nsegs == 1,
("%s: too many DMA segments (%d)", __func__, nsegs));
rxs->rxs_mbuf = m;
rxs->rxs_paddr = segs[0].ds_addr;
bus_dmamap_sync(sc->sc_rdmatag, rxs->rxs_dmamap,
BUS_DMASYNC_PREREAD);
GEM_INIT_RXDESC(sc, idx);
return (0);
}
static void
gem_eint(struct gem_softc *sc, u_int status)
{
sc->sc_ifp->if_ierrors++;
if ((status & GEM_INTR_RX_TAG_ERR) != 0) {
gem_reset_rxdma(sc);
return;
}
device_printf(sc->sc_dev, "%s: status=%x\n", __func__, status);
}
void
gem_intr(void *v)
{
struct gem_softc *sc = v;
uint32_t status, status2;
GEM_LOCK(sc);
status = GEM_BANK1_READ_4(sc, GEM_STATUS);
#ifdef GEM_DEBUG
CTR4(KTR_GEM, "%s: %s: cplt %x, status %x",
device_get_name(sc->sc_dev), __func__, (status >> 19),
(u_int)status);
/*
* PCS interrupts must be cleared, otherwise no traffic is passed!
*/
if ((status & GEM_INTR_PCS) != 0) {
status2 =
GEM_BANK1_READ_4(sc, GEM_MII_INTERRUP_STATUS) |
GEM_BANK1_READ_4(sc, GEM_MII_INTERRUP_STATUS);
if ((status2 & GEM_MII_INTERRUP_LINK) != 0)
device_printf(sc->sc_dev,
"%s: PCS link status changed\n", __func__);
}
if ((status & GEM_MAC_CONTROL_STATUS) != 0) {
status2 = GEM_BANK1_READ_4(sc, GEM_MAC_CONTROL_STATUS);
if ((status2 & GEM_MAC_PAUSED) != 0)
device_printf(sc->sc_dev,
"%s: PAUSE received (PAUSE time %d slots)\n",
__func__, GEM_MAC_PAUSE_TIME(status2));
if ((status2 & GEM_MAC_PAUSE) != 0)
device_printf(sc->sc_dev,
"%s: transited to PAUSE state\n", __func__);
if ((status2 & GEM_MAC_RESUME) != 0)
device_printf(sc->sc_dev,
"%s: transited to non-PAUSE state\n", __func__);
}
if ((status & GEM_INTR_MIF) != 0)
device_printf(sc->sc_dev, "%s: MIF interrupt\n", __func__);
#endif
if ((status &
(GEM_INTR_RX_TAG_ERR | GEM_INTR_PERR | GEM_INTR_BERR)) != 0)
gem_eint(sc, status);
if ((status & (GEM_INTR_RX_DONE | GEM_INTR_RX_NOBUF)) != 0)
gem_rint(sc);
if ((status & (GEM_INTR_TX_EMPTY | GEM_INTR_TX_INTME)) != 0)
gem_tint(sc);
if (status & GEM_INTR_TX_MAC) {
status2 = GEM_BANK1_READ_4(sc, GEM_MAC_TX_STATUS);
if ((status2 &
~(GEM_MAC_TX_XMIT_DONE | GEM_MAC_TX_DEFER_EXP)) != 0)
device_printf(sc->sc_dev,
"MAC TX fault, status %x\n", status2);
if ((status2 &
(GEM_MAC_TX_UNDERRUN | GEM_MAC_TX_PKT_TOO_LONG)) != 0)
gem_init_locked(sc);
}
if (status & GEM_INTR_RX_MAC) {
status2 = GEM_BANK1_READ_4(sc, GEM_MAC_RX_STATUS);
/*
* At least with GEM_SUN_GEM and some GEM_SUN_ERI
* revisions GEM_MAC_RX_OVERFLOW happen often due to a
* silicon bug so handle them silently. Moreover, it's
* likely that the receiver has hung so we reset it.
*/
if ((status2 & GEM_MAC_RX_OVERFLOW) != 0) {
sc->sc_ifp->if_ierrors++;
gem_reset_rxdma(sc);
} else if ((status2 &
~(GEM_MAC_RX_DONE | GEM_MAC_RX_FRAME_CNT)) != 0)
device_printf(sc->sc_dev,
"MAC RX fault, status %x\n", status2);
}
GEM_UNLOCK(sc);
}
static int
gem_watchdog(struct gem_softc *sc)
{
struct ifnet *ifp = sc->sc_ifp;
GEM_LOCK_ASSERT(sc, MA_OWNED);
#ifdef GEM_DEBUG
CTR4(KTR_GEM,
"%s: GEM_RX_CONFIG %x GEM_MAC_RX_STATUS %x GEM_MAC_RX_CONFIG %x",
__func__, GEM_BANK1_READ_4(sc, GEM_RX_CONFIG),
GEM_BANK1_READ_4(sc, GEM_MAC_RX_STATUS),
GEM_BANK1_READ_4(sc, GEM_MAC_RX_CONFIG));
CTR4(KTR_GEM,
"%s: GEM_TX_CONFIG %x GEM_MAC_TX_STATUS %x GEM_MAC_TX_CONFIG %x",
__func__, GEM_BANK1_READ_4(sc, GEM_TX_CONFIG),
GEM_BANK1_READ_4(sc, GEM_MAC_TX_STATUS),
GEM_BANK1_READ_4(sc, GEM_MAC_TX_CONFIG));
#endif
if (sc->sc_wdog_timer == 0 || --sc->sc_wdog_timer != 0)
return (0);
if ((sc->sc_flags & GEM_LINK) != 0)
device_printf(sc->sc_dev, "device timeout\n");
else if (bootverbose)
device_printf(sc->sc_dev, "device timeout (no link)\n");
++ifp->if_oerrors;
/* Try to get more packets going. */
gem_init_locked(sc);
gem_start_locked(ifp);
return (EJUSTRETURN);
}
static void
gem_mifinit(struct gem_softc *sc)
{
/* Configure the MIF in frame mode. */
GEM_BANK1_WRITE_4(sc, GEM_MIF_CONFIG,
GEM_BANK1_READ_4(sc, GEM_MIF_CONFIG) & ~GEM_MIF_CONFIG_BB_ENA);
}
/*
* MII interface
*
* The GEM MII interface supports at least three different operating modes:
*
* Bitbang mode is implemented using data, clock and output enable registers.
*
* Frame mode is implemented by loading a complete frame into the frame
* register and polling the valid bit for completion.
*
* Polling mode uses the frame register but completion is indicated by
* an interrupt.
*
*/
int
gem_mii_readreg(device_t dev, int phy, int reg)
{
struct gem_softc *sc;
int n;
uint32_t v;
#ifdef GEM_DEBUG_PHY
printf("%s: phy %d reg %d\n", __func__, phy, reg);
#endif
sc = device_get_softc(dev);
if (sc->sc_phyad != -1 && phy != sc->sc_phyad)
return (0);
if ((sc->sc_flags & GEM_SERDES) != 0) {
switch (reg) {
case MII_BMCR:
reg = GEM_MII_CONTROL;
break;
case MII_BMSR:
reg = GEM_MII_STATUS;
break;
case MII_PHYIDR1:
case MII_PHYIDR2:
return (0);
case MII_ANAR:
reg = GEM_MII_ANAR;
break;
case MII_ANLPAR:
reg = GEM_MII_ANLPAR;
break;
case MII_EXTSR:
return (EXTSR_1000XFDX | EXTSR_1000XHDX);
default:
device_printf(sc->sc_dev,
"%s: unhandled register %d\n", __func__, reg);
return (0);
}
return (GEM_BANK1_READ_4(sc, reg));
}
/* Construct the frame command. */
v = GEM_MIF_FRAME_READ |
(phy << GEM_MIF_PHY_SHIFT) |
(reg << GEM_MIF_REG_SHIFT);
GEM_BANK1_WRITE_4(sc, GEM_MIF_FRAME, v);
GEM_BANK1_BARRIER(sc, GEM_MIF_FRAME, 4,
BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
for (n = 0; n < 100; n++) {
DELAY(1);
v = GEM_BANK1_READ_4(sc, GEM_MIF_FRAME);
if (v & GEM_MIF_FRAME_TA0)
return (v & GEM_MIF_FRAME_DATA);
}
device_printf(sc->sc_dev, "%s: timed out\n", __func__);
return (0);
}
int
gem_mii_writereg(device_t dev, int phy, int reg, int val)
{
struct gem_softc *sc;
int n;
uint32_t v;
#ifdef GEM_DEBUG_PHY
printf("%s: phy %d reg %d val %x\n", phy, reg, val, __func__);
#endif
sc = device_get_softc(dev);
if (sc->sc_phyad != -1 && phy != sc->sc_phyad)
return (0);
if ((sc->sc_flags & GEM_SERDES) != 0) {
switch (reg) {
case MII_BMSR:
reg = GEM_MII_STATUS;
break;
case MII_BMCR:
reg = GEM_MII_CONTROL;
if ((val & GEM_MII_CONTROL_RESET) == 0)
break;
GEM_BANK1_WRITE_4(sc, GEM_MII_CONTROL, val);
GEM_BANK1_BARRIER(sc, GEM_MII_CONTROL, 4,
BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
if (!GEM_BANK1_BITWAIT(sc, GEM_MII_CONTROL,
GEM_MII_CONTROL_RESET, 0))
device_printf(sc->sc_dev,
"cannot reset PCS\n");
/* FALLTHROUGH */
case MII_ANAR:
GEM_BANK1_WRITE_4(sc, GEM_MII_CONFIG, 0);
GEM_BANK1_BARRIER(sc, GEM_MII_CONFIG, 4,
BUS_SPACE_BARRIER_WRITE);
GEM_BANK1_WRITE_4(sc, GEM_MII_ANAR, val);
GEM_BANK1_WRITE_4(sc, GEM_MII_SLINK_CONTROL,
GEM_MII_SLINK_LOOPBACK | GEM_MII_SLINK_EN_SYNC_D);
GEM_BANK1_WRITE_4(sc, GEM_MII_CONFIG,
GEM_MII_CONFIG_ENABLE);
return (0);
case MII_ANLPAR:
reg = GEM_MII_ANLPAR;
break;
default:
device_printf(sc->sc_dev,
"%s: unhandled register %d\n", __func__, reg);
return (0);
}
GEM_BANK1_WRITE_4(sc, reg, val);
return (0);
}
/* Construct the frame command. */
v = GEM_MIF_FRAME_WRITE |
(phy << GEM_MIF_PHY_SHIFT) |
(reg << GEM_MIF_REG_SHIFT) |
(val & GEM_MIF_FRAME_DATA);
GEM_BANK1_WRITE_4(sc, GEM_MIF_FRAME, v);
GEM_BANK1_BARRIER(sc, GEM_MIF_FRAME, 4,
BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
for (n = 0; n < 100; n++) {
DELAY(1);
v = GEM_BANK1_READ_4(sc, GEM_MIF_FRAME);
if (v & GEM_MIF_FRAME_TA0)
return (1);
}
device_printf(sc->sc_dev, "%s: timed out\n", __func__);
return (0);
}
void
gem_mii_statchg(device_t dev)
{
struct gem_softc *sc;
int gigabit;
uint32_t rxcfg, txcfg, v;
sc = device_get_softc(dev);
#ifdef GEM_DEBUG
if ((sc->sc_ifp->if_flags & IFF_DEBUG) != 0)
device_printf(sc->sc_dev, "%s: status change: PHY = %d\n",
__func__, sc->sc_phyad);
#endif
if ((sc->sc_mii->mii_media_status & IFM_ACTIVE) != 0 &&
IFM_SUBTYPE(sc->sc_mii->mii_media_active) != IFM_NONE)
sc->sc_flags |= GEM_LINK;
else
sc->sc_flags &= ~GEM_LINK;
switch (IFM_SUBTYPE(sc->sc_mii->mii_media_active)) {
case IFM_1000_SX:
case IFM_1000_LX:
case IFM_1000_CX:
case IFM_1000_T:
gigabit = 1;
break;
default:
gigabit = 0;
}
/*
* The configuration done here corresponds to the steps F) and
* G) and as far as enabling of RX and TX MAC goes also step H)
* of the initialization sequence outlined in section 3.2.1 of
* the GEM Gigabit Ethernet ASIC Specification.
*/
rxcfg = GEM_BANK1_READ_4(sc, GEM_MAC_RX_CONFIG);
rxcfg &= ~(GEM_MAC_RX_CARR_EXTEND | GEM_MAC_RX_ENABLE);
txcfg = GEM_MAC_TX_ENA_IPG0 | GEM_MAC_TX_NGU | GEM_MAC_TX_NGU_LIMIT;
if ((IFM_OPTIONS(sc->sc_mii->mii_media_active) & IFM_FDX) != 0)
txcfg |= GEM_MAC_TX_IGN_CARRIER | GEM_MAC_TX_IGN_COLLIS;
else if (gigabit != 0) {
rxcfg |= GEM_MAC_RX_CARR_EXTEND;
txcfg |= GEM_MAC_TX_CARR_EXTEND;
}
GEM_BANK1_WRITE_4(sc, GEM_MAC_TX_CONFIG, 0);
GEM_BANK1_BARRIER(sc, GEM_MAC_TX_CONFIG, 4,
BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
if (!GEM_BANK1_BITWAIT(sc, GEM_MAC_TX_CONFIG, GEM_MAC_TX_ENABLE, 0))
device_printf(sc->sc_dev, "cannot disable TX MAC\n");
GEM_BANK1_WRITE_4(sc, GEM_MAC_TX_CONFIG, txcfg);
GEM_BANK1_WRITE_4(sc, GEM_MAC_RX_CONFIG, 0);
GEM_BANK1_BARRIER(sc, GEM_MAC_RX_CONFIG, 4,
BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
if (!GEM_BANK1_BITWAIT(sc, GEM_MAC_RX_CONFIG, GEM_MAC_RX_ENABLE, 0))
device_printf(sc->sc_dev, "cannot disable RX MAC\n");
GEM_BANK1_WRITE_4(sc, GEM_MAC_RX_CONFIG, rxcfg);
v = GEM_BANK1_READ_4(sc, GEM_MAC_CONTROL_CONFIG) &
~(GEM_MAC_CC_RX_PAUSE | GEM_MAC_CC_TX_PAUSE);
#ifdef notyet
if ((IFM_OPTIONS(sc->sc_mii->mii_media_active) &
IFM_ETH_RXPAUSE) != 0)
v |= GEM_MAC_CC_RX_PAUSE;
if ((IFM_OPTIONS(sc->sc_mii->mii_media_active) &
IFM_ETH_TXPAUSE) != 0)
v |= GEM_MAC_CC_TX_PAUSE;
#endif
GEM_BANK1_WRITE_4(sc, GEM_MAC_CONTROL_CONFIG, v);
if ((IFM_OPTIONS(sc->sc_mii->mii_media_active) & IFM_FDX) == 0 &&
gigabit != 0)
GEM_BANK1_WRITE_4(sc, GEM_MAC_SLOT_TIME,
GEM_MAC_SLOT_TIME_CARR_EXTEND);
else
GEM_BANK1_WRITE_4(sc, GEM_MAC_SLOT_TIME,
GEM_MAC_SLOT_TIME_NORMAL);
/* XIF Configuration */
v = GEM_MAC_XIF_LINK_LED;
v |= GEM_MAC_XIF_TX_MII_ENA;
if ((sc->sc_flags & GEM_SERDES) == 0) {
if ((GEM_BANK1_READ_4(sc, GEM_MIF_CONFIG) &
GEM_MIF_CONFIG_PHY_SEL) != 0 &&
(IFM_OPTIONS(sc->sc_mii->mii_media_active) &
IFM_FDX) == 0)
/* External MII needs echo disable if half duplex. */
v |= GEM_MAC_XIF_ECHO_DISABL;
else
/*
* Internal MII needs buffer enable.
* XXX buffer enable makes only sense for an
* external PHY.
*/
v |= GEM_MAC_XIF_MII_BUF_ENA;
}
if (gigabit != 0)
v |= GEM_MAC_XIF_GMII_MODE;
if ((IFM_OPTIONS(sc->sc_mii->mii_media_active) & IFM_FDX) != 0)
v |= GEM_MAC_XIF_FDPLX_LED;
GEM_BANK1_WRITE_4(sc, GEM_MAC_XIF_CONFIG, v);
if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) != 0 &&
(sc->sc_flags & GEM_LINK) != 0) {
GEM_BANK1_WRITE_4(sc, GEM_MAC_TX_CONFIG,
txcfg | GEM_MAC_TX_ENABLE);
GEM_BANK1_WRITE_4(sc, GEM_MAC_RX_CONFIG,
rxcfg | GEM_MAC_RX_ENABLE);
}
}
int
gem_mediachange(struct ifnet *ifp)
{
struct gem_softc *sc = ifp->if_softc;
int error;
/* XXX add support for serial media. */
GEM_LOCK(sc);
error = mii_mediachg(sc->sc_mii);
GEM_UNLOCK(sc);
return (error);
}
void
gem_mediastatus(struct ifnet *ifp, struct ifmediareq *ifmr)
{
struct gem_softc *sc = ifp->if_softc;
GEM_LOCK(sc);
if ((ifp->if_flags & IFF_UP) == 0) {
GEM_UNLOCK(sc);
return;
}
mii_pollstat(sc->sc_mii);
ifmr->ifm_active = sc->sc_mii->mii_media_active;
ifmr->ifm_status = sc->sc_mii->mii_media_status;
GEM_UNLOCK(sc);
}
static int
gem_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct gem_softc *sc = ifp->if_softc;
struct ifreq *ifr = (struct ifreq *)data;
int error;
error = 0;
switch (cmd) {
case SIOCSIFFLAGS:
GEM_LOCK(sc);
if ((ifp->if_flags & IFF_UP) != 0) {
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) != 0 &&
((ifp->if_flags ^ sc->sc_ifflags) &
(IFF_ALLMULTI | IFF_PROMISC)) != 0)
gem_setladrf(sc);
else
gem_init_locked(sc);
} else if ((ifp->if_drv_flags & IFF_DRV_RUNNING) != 0)
gem_stop(ifp, 0);
if ((ifp->if_flags & IFF_LINK0) != 0)
sc->sc_csum_features |= CSUM_UDP;
else
sc->sc_csum_features &= ~CSUM_UDP;
if ((ifp->if_capenable & IFCAP_TXCSUM) != 0)
ifp->if_hwassist = sc->sc_csum_features;
sc->sc_ifflags = ifp->if_flags;
GEM_UNLOCK(sc);
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
GEM_LOCK(sc);
gem_setladrf(sc);
GEM_UNLOCK(sc);
break;
case SIOCGIFMEDIA:
case SIOCSIFMEDIA:
error = ifmedia_ioctl(ifp, ifr, &sc->sc_mii->mii_media, cmd);
break;
case SIOCSIFCAP:
GEM_LOCK(sc);
ifp->if_capenable = ifr->ifr_reqcap;
if ((ifp->if_capenable & IFCAP_TXCSUM) != 0)
ifp->if_hwassist = sc->sc_csum_features;
else
ifp->if_hwassist = 0;
GEM_UNLOCK(sc);
break;
default:
error = ether_ioctl(ifp, cmd, data);
break;
}
return (error);
}
static void
gem_setladrf(struct gem_softc *sc)
{
struct ifnet *ifp = sc->sc_ifp;
struct ifmultiaddr *inm;
int i;
uint32_t hash[16];
uint32_t crc, v;
GEM_LOCK_ASSERT(sc, MA_OWNED);
/* Get the current RX configuration. */
v = GEM_BANK1_READ_4(sc, GEM_MAC_RX_CONFIG);
/*
* Turn off promiscuous mode, promiscuous group mode (all multicast),
* and hash filter. Depending on the case, the right bit will be
* enabled.
*/
v &= ~(GEM_MAC_RX_PROMISCUOUS | GEM_MAC_RX_HASH_FILTER |
GEM_MAC_RX_PROMISC_GRP);
GEM_BANK1_WRITE_4(sc, GEM_MAC_RX_CONFIG, v);
GEM_BANK1_BARRIER(sc, GEM_MAC_RX_CONFIG, 4,
BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
if (!GEM_BANK1_BITWAIT(sc, GEM_MAC_RX_CONFIG, GEM_MAC_RX_HASH_FILTER,
0))
device_printf(sc->sc_dev, "cannot disable RX hash filter\n");
if ((ifp->if_flags & IFF_PROMISC) != 0) {
v |= GEM_MAC_RX_PROMISCUOUS;
goto chipit;
}
if ((ifp->if_flags & IFF_ALLMULTI) != 0) {
v |= GEM_MAC_RX_PROMISC_GRP;
goto chipit;
}
/*
* Set up multicast address filter by passing all multicast
* addresses through a crc generator, and then using the high
* order 8 bits as an index into the 256 bit logical address
* filter. The high order 4 bits selects the word, while the
* other 4 bits select the bit within the word (where bit 0
* is the MSB).
*/
/* Clear the hash table. */
memset(hash, 0, sizeof(hash));
IF_ADDR_LOCK(ifp);
TAILQ_FOREACH(inm, &ifp->if_multiaddrs, ifma_link) {
if (inm->ifma_addr->sa_family != AF_LINK)
continue;
crc = ether_crc32_le(LLADDR((struct sockaddr_dl *)
inm->ifma_addr), ETHER_ADDR_LEN);
/* We just want the 8 most significant bits. */
crc >>= 24;
/* Set the corresponding bit in the filter. */
hash[crc >> 4] |= 1 << (15 - (crc & 15));
}
IF_ADDR_UNLOCK(ifp);
v |= GEM_MAC_RX_HASH_FILTER;
/* Now load the hash table into the chip (if we are using it). */
for (i = 0; i < 16; i++)
GEM_BANK1_WRITE_4(sc,
GEM_MAC_HASH0 + i * (GEM_MAC_HASH1 - GEM_MAC_HASH0),
hash[i]);
chipit:
GEM_BANK1_WRITE_4(sc, GEM_MAC_RX_CONFIG, v);
}
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