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freebsd-dev/sys/arm/at91/if_ate.c
Warner Losh 8cd5dc08c3 MFp4: 
o Fix the packet statistics
	o Make sure we set the FD bit when in full duplex
	o Improve TX side efficency by eliminating a data copy for
	  unfragmented mbufs (the hardware can't do s/g).
	o Minor busdma pedantry
	o better comments in some places, more XXX in others
	o Minor style nits.

This solves a problem I was seeing where I'd get no ethernet when not
booting with a NFS root.  Well, unless I unplugged the cable and
plugged it back in first so I'd get the same up down up messages I get
for NFS root...

Thanks to sam and scottl for suggestions on making this driver more
efficient through better use of approrpiate APIs.
2006-11-03 07:39:37 +00:00

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/*-
* Copyright (c) 2006 M. Warner Losh. 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.
*/
/* TODO: (in no order)
*
* 8) Need to sync busdma goo in atestop
* 9) atestop should maybe free the mbufs?
*
* 1) detach
* 2) Free dma setup
* 3) Turn on the clock in pmc? Turn off?
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <machine/bus.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_mib.h>
#include <net/if_types.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#endif
#include <net/bpf.h>
#include <net/bpfdesc.h>
#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>
#include <arm/at91/if_atereg.h>
#include "miibus_if.h"
#define ATE_MAX_TX_BUFFERS 64 /* We have ping-pong tx buffers */
#define ATE_MAX_RX_BUFFERS 64
struct ate_softc
{
struct ifnet *ifp; /* ifnet pointer */
struct mtx sc_mtx; /* basically a perimeter lock */
device_t dev; /* Myself */
device_t miibus; /* My child miibus */
void *intrhand; /* Interrupt handle */
struct resource *irq_res; /* IRQ resource */
struct resource *mem_res; /* Memory resource */
struct callout tick_ch; /* Tick callout */
bus_dma_tag_t mtag; /* bus dma tag for mbufs */
bus_dmamap_t tx_map[ATE_MAX_TX_BUFFERS];
struct mbuf *sent_mbuf[ATE_MAX_TX_BUFFERS]; /* Sent mbufs */
bus_dma_tag_t rxtag;
bus_dmamap_t rx_map[ATE_MAX_RX_BUFFERS];
void *rx_buf[ATE_MAX_RX_BUFFERS]; /* RX buffer space */
int rx_buf_ptr;
bus_dma_tag_t rx_desc_tag;
bus_dmamap_t rx_desc_map;
int txcur; /* current tx map pointer */
bus_addr_t rx_desc_phys;
eth_rx_desc_t *rx_descs;
int use_rmii;
struct ifmib_iso_8802_3 mibdata; /* stuff for network mgmt */
};
static inline uint32_t
RD4(struct ate_softc *sc, bus_size_t off)
{
return bus_read_4(sc->mem_res, off);
}
static inline void
WR4(struct ate_softc *sc, bus_size_t off, uint32_t val)
{
bus_write_4(sc->mem_res, off, val);
}
#define ATE_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
#define ATE_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
#define ATE_LOCK_INIT(_sc) \
mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->dev), \
MTX_NETWORK_LOCK, MTX_DEF)
#define ATE_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
#define ATE_ASSERT_LOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED);
#define ATE_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED);
static devclass_t ate_devclass;
/* ifnet entry points */
static void ateinit_locked(void *);
static void atestart_locked(struct ifnet *);
static void ateinit(void *);
static void atestart(struct ifnet *);
static void atestop(struct ate_softc *);
static void atewatchdog(struct ifnet *);
static int ateioctl(struct ifnet * ifp, u_long, caddr_t);
/* bus entry points */
static int ate_probe(device_t dev);
static int ate_attach(device_t dev);
static int ate_detach(device_t dev);
static void ate_intr(void *);
/* helper routines */
static int ate_activate(device_t dev);
static void ate_deactivate(device_t dev);
static int ate_ifmedia_upd(struct ifnet *ifp);
static void ate_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr);
static void ate_get_mac(struct ate_softc *sc, u_char *eaddr);
static void ate_set_mac(struct ate_softc *sc, u_char *eaddr);
/*
* The AT91 family of products has the ethernet called EMAC. However,
* it isn't self identifying. It is anticipated that the parent bus
* code will take care to only add ate devices where they really are. As
* such, we do nothing here to identify the device and just set its name.
*/
static int
ate_probe(device_t dev)
{
device_set_desc(dev, "EMAC");
return (0);
}
static int
ate_attach(device_t dev)
{
struct ate_softc *sc = device_get_softc(dev);
struct ifnet *ifp = NULL;
struct sysctl_ctx_list *sctx;
struct sysctl_oid *soid;
int err;
u_char eaddr[6];
sc->dev = dev;
err = ate_activate(dev);
if (err)
goto out;
sc->use_rmii = (RD4(sc, ETH_CFG) & ETH_CFG_RMII) == ETH_CFG_RMII;
/*Sysctls*/
sctx = device_get_sysctl_ctx(dev);
soid = device_get_sysctl_tree(dev);
SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "rmii",
CTLFLAG_RD, &sc->use_rmii, 0, "rmii in use");
/* calling atestop before ifp is set is OK */
atestop(sc);
ATE_LOCK_INIT(sc);
callout_init_mtx(&sc->tick_ch, &sc->sc_mtx, 0);
ate_get_mac(sc, eaddr);
ate_set_mac(sc, eaddr);
sc->ifp = ifp = if_alloc(IFT_ETHER);
if (mii_phy_probe(dev, &sc->miibus, ate_ifmedia_upd, ate_ifmedia_sts)) {
device_printf(dev, "Cannot find my PHY.\n");
err = ENXIO;
goto out;
}
ifp->if_softc = sc;
if_initname(ifp, device_get_name(dev), device_get_unit(dev));
ifp->if_mtu = ETHERMTU;
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_start = atestart;
ifp->if_ioctl = ateioctl;
ifp->if_watchdog = atewatchdog;
ifp->if_init = ateinit;
ifp->if_baudrate = 10000000;
IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
IFQ_SET_READY(&ifp->if_snd);
ifp->if_timer = 0;
ifp->if_linkmib = &sc->mibdata;
ifp->if_linkmiblen = sizeof(sc->mibdata);
sc->mibdata.dot3Compliance = DOT3COMPLIANCE_COLLS;
ether_ifattach(ifp, eaddr);
/*
* Activate the interrupt
*/
err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_NET | INTR_MPSAFE,
ate_intr, sc, &sc->intrhand);
if (err) {
ether_ifdetach(ifp);
ATE_LOCK_DESTROY(sc);
}
out:;
if (err)
ate_deactivate(dev);
if (err && ifp)
if_free(ifp);
return (err);
}
static int
ate_detach(device_t dev)
{
return EBUSY; /* XXX TODO(1) */
}
static void
ate_getaddr(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
{
struct ate_softc *sc;
if (error != 0)
return;
sc = (struct ate_softc *)arg;
sc->rx_desc_phys = segs[0].ds_addr;
}
static void
ate_load_rx_buf(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
{
struct ate_softc *sc;
int i;
if (error != 0)
return;
sc = (struct ate_softc *)arg;
i = sc->rx_buf_ptr;
/*
* For the last buffer, set the wrap bit so the controller
* restarts from the first descriptor.
*/
bus_dmamap_sync(sc->rx_desc_tag, sc->rx_desc_map, BUS_DMASYNC_PREWRITE);
if (i == ATE_MAX_RX_BUFFERS - 1)
sc->rx_descs[i].addr = segs[0].ds_addr | ETH_WRAP_BIT;
else
sc->rx_descs[i].addr = segs[0].ds_addr;
bus_dmamap_sync(sc->rx_desc_tag, sc->rx_desc_map, BUS_DMASYNC_POSTWRITE);
sc->rx_descs[i].status = 0;
/* Flush the memory in the mbuf */
bus_dmamap_sync(sc->rxtag, sc->rx_map[i], BUS_DMASYNC_PREREAD);
}
/*
* Compute the multicast filter for this device using the standard
* algorithm. I wonder why this isn't in ether somewhere as a lot
* of different MAC chips use this method (or the reverse the bits)
* method.
*/
static void
ate_setmcast(struct ate_softc *sc)
{
uint32_t index;
uint32_t mcaf[2];
u_char *af = (u_char *) mcaf;
struct ifmultiaddr *ifma;
mcaf[0] = 0;
mcaf[1] = 0;
IF_ADDR_LOCK(sc->ifp);
TAILQ_FOREACH(ifma, &sc->ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_LINK)
continue;
index = ether_crc32_be(LLADDR((struct sockaddr_dl *)
ifma->ifma_addr), ETHER_ADDR_LEN) >> 26;
af[index >> 3] |= 1 << (index & 7);
}
IF_ADDR_UNLOCK(sc->ifp);
/*
* Write the hash to the hash register. This card can also
* accept unicast packets as well as multicast packets using this
* register for easier bridging operations, but we don't take
* advantage of that. Locks here are to avoid LOR with the
* IF_ADDR_LOCK, but might not be strictly necessary.
*/
WR4(sc, ETH_HSL, mcaf[0]);
WR4(sc, ETH_HSH, mcaf[1]);
}
static int
ate_activate(device_t dev)
{
struct ate_softc *sc;
int rid, err, i;
sc = device_get_softc(dev);
rid = 0;
sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (sc->mem_res == NULL)
goto errout;
rid = 0;
sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_ACTIVE);
if (sc->irq_res == NULL)
goto errout;
/*
* Allocate DMA tags and maps
*/
err = bus_dma_tag_create(NULL, 1, 0, BUS_SPACE_MAXADDR_32BIT,
BUS_SPACE_MAXADDR, NULL, NULL, MCLBYTES, 1, MCLBYTES, 0,
busdma_lock_mutex, &sc->sc_mtx, &sc->mtag);
if (err != 0)
goto errout;
for (i = 0; i < ATE_MAX_TX_BUFFERS; i++) {
err = bus_dmamap_create(sc->mtag, 0, &sc->tx_map[i]);
if (err != 0)
goto errout;
}
/*
* Allocate our Rx buffers. This chip has a rx structure that's filled
* in
*/
/*
* Allocate DMA tags and maps for RX.
*/
err = bus_dma_tag_create(NULL, 1, 0, BUS_SPACE_MAXADDR_32BIT,
BUS_SPACE_MAXADDR, NULL, NULL, MCLBYTES, 1, MCLBYTES, 0,
busdma_lock_mutex, &sc->sc_mtx, &sc->rxtag);
if (err != 0)
goto errout;
/* Dma TAG and MAP for the rx descriptors. */
err = bus_dma_tag_create(NULL, sizeof(eth_rx_desc_t), 0,
BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
ATE_MAX_RX_BUFFERS * sizeof(eth_rx_desc_t), 1,
ATE_MAX_RX_BUFFERS * sizeof(eth_rx_desc_t), 0, busdma_lock_mutex,
&sc->sc_mtx, &sc->rx_desc_tag);
if (err != 0)
goto errout;
if (bus_dmamem_alloc(sc->rx_desc_tag, (void **)&sc->rx_descs,
BUS_DMA_NOWAIT | BUS_DMA_COHERENT, &sc->rx_desc_map) != 0)
goto errout;
if (bus_dmamap_load(sc->rx_desc_tag, sc->rx_desc_map,
sc->rx_descs, ATE_MAX_RX_BUFFERS * sizeof(eth_rx_desc_t),
ate_getaddr, sc, 0) != 0)
goto errout;
/* XXX TODO(5) Put this in ateinit_locked? */
for (i = 0; i < ATE_MAX_RX_BUFFERS; i++) {
sc->rx_buf_ptr = i;
if (bus_dmamem_alloc(sc->rxtag, (void **)&sc->rx_buf[i],
BUS_DMA_NOWAIT, &sc->rx_map[i]) != 0)
goto errout;
if (bus_dmamap_load(sc->rxtag, sc->rx_map[i], sc->rx_buf[i],
MCLBYTES, ate_load_rx_buf, sc, 0) != 0)
goto errout;
}
sc->rx_buf_ptr = 0;
/* Flush the memory for the EMAC rx descriptor */
bus_dmamap_sync(sc->rx_desc_tag, sc->rx_desc_map, BUS_DMASYNC_PREWRITE);
/* Write the descriptor queue address. */
WR4(sc, ETH_RBQP, sc->rx_desc_phys);
return (0);
errout:
ate_deactivate(dev);
return (ENOMEM);
}
static void
ate_deactivate(device_t dev)
{
struct ate_softc *sc;
sc = device_get_softc(dev);
/* XXX TODO(2) teardown busdma junk, below from fxp -- customize */
#if 0
if (sc->fxp_mtag) {
for (i = 0; i < FXP_NRFABUFS; i++) {
rxp = &sc->fxp_desc.rx_list[i];
if (rxp->rx_mbuf != NULL) {
bus_dmamap_sync(sc->fxp_mtag, rxp->rx_map,
BUS_DMASYNC_POSTREAD);
bus_dmamap_unload(sc->fxp_mtag, rxp->rx_map);
m_freem(rxp->rx_mbuf);
}
bus_dmamap_destroy(sc->fxp_mtag, rxp->rx_map);
}
bus_dmamap_destroy(sc->fxp_mtag, sc->spare_map);
for (i = 0; i < FXP_NTXCB; i++) {
txp = &sc->fxp_desc.tx_list[i];
if (txp->tx_mbuf != NULL) {
bus_dmamap_sync(sc->fxp_mtag, txp->tx_map,
BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(sc->fxp_mtag, txp->tx_map);
m_freem(txp->tx_mbuf);
}
bus_dmamap_destroy(sc->fxp_mtag, txp->tx_map);
}
bus_dma_tag_destroy(sc->fxp_mtag);
}
if (sc->fxp_stag)
bus_dma_tag_destroy(sc->fxp_stag);
if (sc->cbl_tag)
bus_dma_tag_destroy(sc->cbl_tag);
if (sc->mcs_tag)
bus_dma_tag_destroy(sc->mcs_tag);
#endif
if (sc->intrhand)
bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
sc->intrhand = 0;
bus_generic_detach(sc->dev);
if (sc->miibus)
device_delete_child(sc->dev, sc->miibus);
if (sc->mem_res)
bus_release_resource(dev, SYS_RES_IOPORT,
rman_get_rid(sc->mem_res), sc->mem_res);
sc->mem_res = 0;
if (sc->irq_res)
bus_release_resource(dev, SYS_RES_IRQ,
rman_get_rid(sc->irq_res), sc->irq_res);
sc->irq_res = 0;
return;
}
/*
* Change media according to request.
*/
static int
ate_ifmedia_upd(struct ifnet *ifp)
{
struct ate_softc *sc = ifp->if_softc;
struct mii_data *mii;
mii = device_get_softc(sc->miibus);
ATE_LOCK(sc);
mii_mediachg(mii);
ATE_UNLOCK(sc);
return (0);
}
/*
* Notify the world which media we're using.
*/
static void
ate_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr)
{
struct ate_softc *sc = ifp->if_softc;
struct mii_data *mii;
mii = device_get_softc(sc->miibus);
ATE_LOCK(sc);
mii_pollstat(mii);
ifmr->ifm_active = mii->mii_media_active;
ifmr->ifm_status = mii->mii_media_status;
ATE_UNLOCK(sc);
}
static void
ate_stat_update(struct ate_softc *sc, int active)
{
/*
* The speed and full/half-duplex state needs to be reflected
* in the ETH_CFG register.
*/
if (IFM_SUBTYPE(active) == IFM_10_T)
WR4(sc, ETH_CFG, RD4(sc, ETH_CFG) & ~ETH_CFG_SPD);
else
WR4(sc, ETH_CFG, RD4(sc, ETH_CFG) | ETH_CFG_SPD);
if (active & IFM_FDX)
WR4(sc, ETH_CFG, RD4(sc, ETH_CFG) | ETH_CFG_FD);
else
WR4(sc, ETH_CFG, RD4(sc, ETH_CFG) & ~ETH_CFG_FD);
}
static void
ate_tick(void *xsc)
{
struct ate_softc *sc = xsc;
struct ifnet *ifp = sc->ifp;
struct mii_data *mii;
int active;
uint32_t c;
/*
* The KB920x boot loader tests ETH_SR & ETH_SR_LINK and will ask
* the MII if there's a link if this bit is clear. Not sure if we
* should do the same thing here or not.
*/
ATE_ASSERT_LOCKED(sc);
if (sc->miibus != NULL) {
mii = device_get_softc(sc->miibus);
active = mii->mii_media_active;
mii_tick(mii);
if (mii->mii_media_status & IFM_ACTIVE &&
active != mii->mii_media_active)
ate_stat_update(sc, mii->mii_media_active);
}
/*
* Update the stats as best we can. When we're done, clear
* the status counters and start over. We're supposed to read these
* registers often enough that they won't overflow. Hopefully
* once a second is often enough. Some don't map well to
* the dot3Stats mib, so for those we just count them as general
* errors. Stats for iframes, ibutes, oframes and obytes are
* collected elsewhere. These registers zero on a read to prevent
* races. For all the collision stats, also update the collision
* stats for the interface.
*/
sc->mibdata.dot3StatsAlignmentErrors += RD4(sc, ETH_ALE);
sc->mibdata.dot3StatsFCSErrors += RD4(sc, ETH_SEQE);
c = RD4(sc, ETH_SCOL);
ifp->if_collisions += c;
sc->mibdata.dot3StatsSingleCollisionFrames += c;
c = RD4(sc, ETH_MCOL);
sc->mibdata.dot3StatsMultipleCollisionFrames += c;
ifp->if_collisions += c;
sc->mibdata.dot3StatsSQETestErrors += RD4(sc, ETH_SQEE);
sc->mibdata.dot3StatsDeferredTransmissions += RD4(sc, ETH_DTE);
c = RD4(sc, ETH_LCOL);
sc->mibdata.dot3StatsLateCollisions += c;
ifp->if_collisions += c;
c = RD4(sc, ETH_ECOL);
sc->mibdata.dot3StatsExcessiveCollisions += c;
ifp->if_collisions += c;
sc->mibdata.dot3StatsCarrierSenseErrors += RD4(sc, ETH_CSE);
sc->mibdata.dot3StatsFrameTooLongs += RD4(sc, ETH_ELR);
sc->mibdata.dot3StatsInternalMacReceiveErrors += RD4(sc, ETH_DRFC);
/*
* not sure where to lump these, so count them against the errors
* for the interface.
*/
sc->ifp->if_oerrors += RD4(sc, ETH_TUE);
sc->ifp->if_ierrors += RD4(sc, ETH_CDE) + RD4(sc, ETH_RJB) +
RD4(sc, ETH_USF);
/*
* Schedule another timeout one second from now.
*/
callout_reset(&sc->tick_ch, hz, ate_tick, sc);
}
static void
ate_set_mac(struct ate_softc *sc, u_char *eaddr)
{
WR4(sc, ETH_SA1L, (eaddr[3] << 24) | (eaddr[2] << 16) |
(eaddr[1] << 8) | eaddr[0]);
WR4(sc, ETH_SA1H, (eaddr[5] << 8) | (eaddr[4]));
}
static void
ate_get_mac(struct ate_softc *sc, u_char *eaddr)
{
uint32_t low, high;
/*
* The boot loader setup the MAC with an address, if one is set in
* the loader. The TSC loader will also set the MAC address in a
* similar way. Grab the MAC address from the SA1[HL] registers.
*/
low = RD4(sc, ETH_SA1L);
high = RD4(sc, ETH_SA1H);
eaddr[0] = (high >> 8) & 0xff;
eaddr[1] = high & 0xff;
eaddr[2] = (low >> 24) & 0xff;
eaddr[3] = (low >> 16) & 0xff;
eaddr[4] = (low >> 8) & 0xff;
eaddr[5] = low & 0xff;
}
static void
ate_intr(void *xsc)
{
struct ate_softc *sc = xsc;
struct ifnet *ifp = sc->ifp;
int status;
int i;
void *bp;
struct mbuf *mb;
uint32_t rx_stat;
status = RD4(sc, ETH_ISR);
if (status == 0)
return;
if (status & ETH_ISR_RCOM) {
bus_dmamap_sync(sc->rx_desc_tag, sc->rx_desc_map,
BUS_DMASYNC_POSTREAD);
while (sc->rx_descs[sc->rx_buf_ptr].addr & ETH_CPU_OWNER) {
i = sc->rx_buf_ptr;
sc->rx_buf_ptr = (i + 1) % ATE_MAX_RX_BUFFERS;
bp = sc->rx_buf[i];
rx_stat = sc->rx_descs[i].status;
if ((rx_stat & ETH_LEN_MASK) == 0) {
printf("ignoring bogus 0 len packet\n");
bus_dmamap_sync(sc->rx_desc_tag, sc->rx_desc_map,
BUS_DMASYNC_PREWRITE);
sc->rx_descs[i].addr &= ~ETH_CPU_OWNER;
bus_dmamap_sync(sc->rx_desc_tag, sc->rx_desc_map,
BUS_DMASYNC_POSTWRITE);
continue;
}
/* Flush memory for mbuf so we don't get stale bytes */
bus_dmamap_sync(sc->rxtag, sc->rx_map[i],
BUS_DMASYNC_POSTREAD);
WR4(sc, ETH_RSR, RD4(sc, ETH_RSR));
/*
* The length returned by the device includes the
* ethernet CRC calculation for the packet, but
* ifnet drivers are supposed to discard it.
*/
mb = m_devget(sc->rx_buf[i],
(rx_stat & ETH_LEN_MASK) - ETHER_CRC_LEN,
ETHER_ALIGN, ifp, NULL);
bus_dmamap_sync(sc->rx_desc_tag, sc->rx_desc_map,
BUS_DMASYNC_PREWRITE);
sc->rx_descs[i].addr &= ~ETH_CPU_OWNER;
bus_dmamap_sync(sc->rx_desc_tag, sc->rx_desc_map,
BUS_DMASYNC_POSTWRITE);
bus_dmamap_sync(sc->rxtag, sc->rx_map[i],
BUS_DMASYNC_PREREAD);
if (mb != NULL) {
ifp->if_ipackets++;
(*ifp->if_input)(ifp, mb);
}
}
}
if (status & ETH_ISR_TCOM) {
ATE_LOCK(sc);
/* XXX TSR register should be cleared */
if (sc->sent_mbuf[0]) {
bus_dmamap_sync(sc->rxtag, sc->tx_map[0],
BUS_DMASYNC_POSTWRITE);
m_freem(sc->sent_mbuf[0]);
ifp->if_opackets++;
sc->sent_mbuf[0] = NULL;
}
if (sc->sent_mbuf[1]) {
if (RD4(sc, ETH_TSR) & ETH_TSR_IDLE) {
bus_dmamap_sync(sc->rxtag, sc->tx_map[1],
BUS_DMASYNC_POSTWRITE);
m_freem(sc->sent_mbuf[1]);
ifp->if_opackets++;
sc->txcur = 0;
sc->sent_mbuf[0] = sc->sent_mbuf[1] = NULL;
} else {
sc->sent_mbuf[0] = sc->sent_mbuf[1];
sc->sent_mbuf[1] = NULL;
sc->txcur = 1;
}
} else {
sc->sent_mbuf[0] = NULL;
sc->txcur = 0;
}
/*
* We're no longer busy, so clear the busy flag and call the
* start routine to xmit more packets.
*/
sc->ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
atestart_locked(sc->ifp);
ATE_UNLOCK(sc);
}
if (status & ETH_ISR_RBNA) {
printf("RBNA workaround\n");
/* Workaround Errata #11 */
WR4(sc, ETH_CTL, RD4(sc, ETH_CTL) &~ ETH_CTL_RE);
WR4(sc, ETH_CTL, RD4(sc, ETH_CTL) | ETH_CTL_RE);
}
}
/*
* Reset and initialize the chip
*/
static void
ateinit_locked(void *xsc)
{
struct ate_softc *sc = xsc;
struct ifnet *ifp = sc->ifp;
struct mii_data *mii;
ATE_ASSERT_LOCKED(sc);
/*
* XXX TODO(3)
* we need to turn on the EMAC clock in the pmc. With the
* default boot loader, this is already turned on. However, we
* need to think about how best to turn it on/off as the interface
* is brought up/down, as well as dealing with the mii bus...
*
* We also need to multiplex the pins correctly.
*/
/*
* There are two different ways that the mii bus is connected
* to this chip. Select the right one based on a compile-time
* option.
*/
if (sc->use_rmii)
WR4(sc, ETH_CFG, RD4(sc, ETH_CFG) | ETH_CFG_RMII);
else
WR4(sc, ETH_CFG, RD4(sc, ETH_CFG) & ~ETH_CFG_RMII);
/*
* Turn on the multicast hash, and write 0's to it.
*/
WR4(sc, ETH_CFG, RD4(sc, ETH_CFG) | ETH_CFG_MTI);
WR4(sc, ETH_HSH, 0);
WR4(sc, ETH_HSL, 0);
WR4(sc, ETH_CTL, RD4(sc, ETH_CTL) | ETH_CTL_TE | ETH_CTL_RE);
WR4(sc, ETH_IER, ETH_ISR_RCOM | ETH_ISR_TCOM | ETH_ISR_RBNA);
/*
* Boot loader fills in MAC address. If that's not the case, then
* we should set SA1L and SA1H here to the appropriate value. Note:
* the byte order is big endian, not little endian, so we have some
* swapping to do. Again, if we need it (which I don't think we do).
*/
ate_setmcast(sc);
/*
* Set 'running' flag, and clear output active flag
* and attempt to start the output
*/
ifp->if_drv_flags |= IFF_DRV_RUNNING;
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
mii = device_get_softc(sc->miibus);
mii_pollstat(mii);
ate_stat_update(sc, mii->mii_media_active);
atestart_locked(ifp);
callout_reset(&sc->tick_ch, hz, ate_tick, sc);
}
/*
* dequeu packets and transmit
*/
static void
atestart_locked(struct ifnet *ifp)
{
struct ate_softc *sc = ifp->if_softc;
struct mbuf *m, *mdefrag;
bus_dma_segment_t segs[1];
int nseg, e;
ATE_ASSERT_LOCKED(sc);
if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
return;
while (sc->txcur < ATE_MAX_TX_BUFFERS) {
/*
* check to see if there's room to put another packet into the
* xmit queue. The EMAC chip has a ping-pong buffer for xmit
* packets. We use OACTIVE to indicate "we can stuff more into
* our buffers (clear) or not (set)."
*/
if (!(RD4(sc, ETH_TSR) & ETH_TSR_BNQ)) {
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
return;
}
IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
if (m == 0) {
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
return;
}
e = bus_dmamap_load_mbuf_sg(sc->mtag, sc->tx_map[sc->txcur], m,
segs, &nseg, 0);
if (e == EFBIG) {
mdefrag = m_defrag(m, M_DONTWAIT);
if (mdefrag == NULL) {
IFQ_DRV_PREPEND(&ifp->if_snd, m);
return;
}
m = mdefrag;
e = bus_dmamap_load_mbuf_sg(sc->mtag,
sc->tx_map[sc->txcur], m, segs, &nseg, 0);
}
if (e != 0) {
m_freem(m);
continue;
}
bus_dmamap_sync(sc->mtag, sc->tx_map[sc->txcur],
BUS_DMASYNC_PREWRITE);
/*
* tell the hardware to xmit the packet.
*/
WR4(sc, ETH_TAR, segs[0].ds_addr);
WR4(sc, ETH_TCR, segs[0].ds_len);
/*
* Tap off here if there is a bpf listener.
*/
BPF_MTAP(ifp, m);
sc->sent_mbuf[sc->txcur] = m;
sc->txcur++;
}
}
static void
ateinit(void *xsc)
{
struct ate_softc *sc = xsc;
ATE_LOCK(sc);
ateinit_locked(sc);
ATE_UNLOCK(sc);
}
static void
atestart(struct ifnet *ifp)
{
struct ate_softc *sc = ifp->if_softc;
ATE_LOCK(sc);
atestart_locked(ifp);
ATE_UNLOCK(sc);
}
/*
* Turn off interrupts, and stop the nic. Can be called with sc->ifp NULL
* so be careful.
*/
static void
atestop(struct ate_softc *sc)
{
struct ifnet *ifp = sc->ifp;
if (ifp) {
ifp->if_timer = 0;
ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
}
callout_stop(&sc->tick_ch);
/*
* Enable some parts of the MAC that are needed always (like the
* MII bus. This turns off the RE and TE bits, which will remain
* off until ateinit() is called to turn them on. With RE and TE
* turned off, there's no DMA to worry about after this write.
*/
WR4(sc, ETH_CTL, ETH_CTL_MPE);
/*
* Turn off all the configured options and revert to defaults.
*/
WR4(sc, ETH_CFG, ETH_CFG_CLK_32);
/*
* Turn off all the interrupts, and ack any pending ones by reading
* the ISR.
*/
WR4(sc, ETH_IDR, 0xffffffff);
RD4(sc, ETH_ISR);
/*
* Clear out the Transmit and Receiver Status registers of any
* errors they may be reporting
*/
WR4(sc, ETH_TSR, 0xffffffff);
WR4(sc, ETH_RSR, 0xffffffff);
/*
* XXX TODO(8)
* need to worry about the busdma resources? Yes, I think we need
* to sync and unload them. We may also need to release the mbufs
* that are assocaited with RX and TX operations.
*/
/*
* XXX we should power down the EMAC if it isn't in use, after
* putting it into loopback mode. This saves about 400uA according
* to the datasheet.
*/
}
static void
atewatchdog(struct ifnet *ifp)
{
struct ate_softc *sc = ifp->if_softc;
ATE_LOCK(sc);
device_printf(sc->dev, "Device timeout\n");
ifp->if_oerrors++;
ateinit_locked(sc);
ATE_UNLOCK(sc);
}
static int
ateioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct ate_softc *sc = ifp->if_softc;
struct mii_data *mii;
struct ifreq *ifr = (struct ifreq *)data;
int error = 0;
switch (cmd) {
case SIOCSIFFLAGS:
ATE_LOCK(sc);
if ((ifp->if_flags & IFF_UP) == 0 &&
ifp->if_drv_flags & IFF_DRV_RUNNING) {
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
atestop(sc);
} else {
/* reinitialize card on any parameter change */
ateinit_locked(sc);
}
ATE_UNLOCK(sc);
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
/* update multicast filter list. */
ATE_LOCK(sc);
ate_setmcast(sc);
ATE_UNLOCK(sc);
error = 0;
break;
case SIOCSIFMEDIA:
case SIOCGIFMEDIA:
mii = device_get_softc(sc->miibus);
error = ifmedia_ioctl(ifp, ifr, &mii->mii_media, cmd);
break;
default:
error = ether_ioctl(ifp, cmd, data);
break;
}
return (error);
}
static void
ate_child_detached(device_t dev, device_t child)
{
struct ate_softc *sc;
sc = device_get_softc(dev);
if (child == sc->miibus)
sc->miibus = NULL;
}
/*
* MII bus support routines.
*/
static int
ate_miibus_readreg(device_t dev, int phy, int reg)
{
struct ate_softc *sc;
int val;
/*
* XXX if we implement agressive power savings, then we need
* XXX to make sure that the clock to the emac is on here
*/
if (phy != 0)
return (0xffff);
sc = device_get_softc(dev);
DELAY(1); /* Hangs w/o this delay really 30.5us atm */
WR4(sc, ETH_MAN, ETH_MAN_REG_RD(phy, reg));
while ((RD4(sc, ETH_SR) & ETH_SR_IDLE) == 0)
continue;
val = RD4(sc, ETH_MAN) & ETH_MAN_VALUE_MASK;
return (val);
}
static void
ate_miibus_writereg(device_t dev, int phy, int reg, int data)
{
struct ate_softc *sc;
/*
* XXX if we implement agressive power savings, then we need
* XXX to make sure that the clock to the emac is on here
*/
sc = device_get_softc(dev);
WR4(sc, ETH_MAN, ETH_MAN_REG_WR(phy, reg, data));
while ((RD4(sc, ETH_SR) & ETH_SR_IDLE) == 0)
continue;
return;
}
static device_method_t ate_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, ate_probe),
DEVMETHOD(device_attach, ate_attach),
DEVMETHOD(device_detach, ate_detach),
/* Bus interface */
DEVMETHOD(bus_child_detached, ate_child_detached),
/* MII interface */
DEVMETHOD(miibus_readreg, ate_miibus_readreg),
DEVMETHOD(miibus_writereg, ate_miibus_writereg),
{ 0, 0 }
};
static driver_t ate_driver = {
"ate",
ate_methods,
sizeof(struct ate_softc),
};
DRIVER_MODULE(ate, atmelarm, ate_driver, ate_devclass, 0, 0);
DRIVER_MODULE(miibus, ate, miibus_driver, miibus_devclass, 0, 0);
MODULE_DEPEND(ate, miibus, 1, 1, 1);
MODULE_DEPEND(ate, ether, 1, 1, 1);
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