38e6324da4
sn(4) driver and also looking at newer drivers. The reason for the rewrite is to support MII and to try and resolve some performance issues found when trying to use the sn(4) driver on the Gumstix network boards. For reference, the SMSC LAN91C111 is a non-PCI ethernet part whose lineage dates back to Ye Olde Days of ISA. It seems to get some use in the embedded space these days on parts lacking on-board MACs or on-board PCI controllers, such as the XScale PXA line of ARM CPUs. This also includes a driver for the SMSC LAN83C183 10/100 PHY. Man page to follow.
266 lines
6.4 KiB
C
266 lines
6.4 KiB
C
/*-
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* Copyright (c) 2006 Benno Rice. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Driver for the internal PHY on the SMSC LAN91C111.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/socket.h>
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#include <sys/errno.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <sys/malloc.h>
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#include <machine/bus.h>
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#include <net/if.h>
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#include <net/if_media.h>
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#include <dev/mii/mii.h>
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#include <dev/mii/miivar.h>
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#include "miidevs.h"
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#include "miibus_if.h"
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static int smcphy_probe(device_t);
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static int smcphy_attach(device_t);
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static int smcphy_service(struct mii_softc *, struct mii_data *, int);
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static int smcphy_reset(struct mii_softc *);
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static void smcphy_auto(struct mii_softc *);
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static device_method_t smcphy_methods[] = {
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/* device interface */
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DEVMETHOD(device_probe, smcphy_probe),
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DEVMETHOD(device_attach, smcphy_attach),
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DEVMETHOD(device_detach, mii_phy_detach),
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DEVMETHOD(device_shutdown, bus_generic_shutdown),
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{ 0, 0 }
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};
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static devclass_t smcphy_devclass;
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static driver_t smcphy_driver = {
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"smcphy",
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smcphy_methods,
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sizeof(struct mii_softc)
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};
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DRIVER_MODULE(smcphy, miibus, smcphy_driver, smcphy_devclass, 0, 0);
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static int
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smcphy_probe(device_t dev)
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{
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struct mii_attach_args *ma;
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ma = device_get_ivars(dev);
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if (MII_OUI(ma->mii_id1, ma->mii_id2) != MII_OUI_SMSC ||
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MII_MODEL(ma->mii_id2) != MII_MODEL_SMSC_LAN83C183)
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return (ENXIO);
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device_set_desc(dev, MII_STR_SMSC_LAN83C183);
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return (0);
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}
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static int
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smcphy_attach(device_t dev)
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{
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struct mii_softc *sc;
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struct mii_attach_args *ma;
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struct mii_data *mii;
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sc = device_get_softc(dev);
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ma = device_get_ivars(dev);
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sc->mii_dev = device_get_parent(dev);
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mii = device_get_softc(sc->mii_dev);
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LIST_INSERT_HEAD(&mii->mii_phys, sc, mii_list);
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sc->mii_inst = mii->mii_instance;
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sc->mii_phy = ma->mii_phyno;
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sc->mii_service = smcphy_service;
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sc->mii_pdata = mii;
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mii->mii_instance++;
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sc->mii_flags |= MIIF_NOISOLATE;
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if (smcphy_reset(sc) != 0) {
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device_printf(dev, "reset failed\n");
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}
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/* Mask interrupts, we poll instead. */
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PHY_WRITE(sc, 0x1e, 0xffc0);
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sc->mii_capabilities = PHY_READ(sc, MII_BMSR) & ma->mii_capmask;
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device_printf(dev, " ");
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mii_add_media(sc);
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printf("\n");
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MIIBUS_MEDIAINIT(sc->mii_dev);
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mii_phy_setmedia(sc);
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return (0);
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}
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static int
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smcphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
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{
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struct ifmedia_entry *ife;
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int reg;
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ife = mii->mii_media.ifm_cur;
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switch (cmd) {
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case MII_POLLSTAT:
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/*
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* If we're not polling our PHY instance, just return.
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*/
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if (IFM_INST(ife->ifm_media) != sc->mii_inst)
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return (0);
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break;
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case MII_MEDIACHG:
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/*
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* If the media indicates a different PHY instance,
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* isolate ourselves.
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*/
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if (IFM_INST(ife->ifm_media) != sc->mii_inst) {
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reg = PHY_READ(sc, MII_BMCR);
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PHY_WRITE(sc, MII_BMCR, reg | BMCR_ISO);
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return (0);
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}
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/*
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* If the interface is not up, don't do anything.
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*/
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if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
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break;
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switch (IFM_SUBTYPE(ife->ifm_media)) {
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case IFM_AUTO:
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smcphy_auto(sc);
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break;
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default:
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mii_phy_setmedia(sc);
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break;
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}
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break;
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case MII_TICK:
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/*
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* If we're not currently selected, just return.
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*/
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if (IFM_INST(ife->ifm_media) != sc->mii_inst) {
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return (0);
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}
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if ((mii->mii_ifp->if_flags & IFF_UP) == 0) {
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return (0);
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}
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if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO) {
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break;
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}
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/* I have no idea why BMCR_ISO gets set. */
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reg = PHY_READ(sc, MII_BMCR);
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if (reg & BMCR_ISO) {
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PHY_WRITE(sc, MII_BMCR, reg & ~BMCR_ISO);
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}
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reg = PHY_READ(sc, MII_BMSR) | PHY_READ(sc, MII_BMSR);
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if (reg & BMSR_LINK) {
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sc->mii_ticks = 0;
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break;
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}
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if (++sc->mii_ticks <= MII_ANEGTICKS) {
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break;
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}
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sc->mii_ticks = 0;
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if (smcphy_reset(sc) != 0) {
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device_printf(sc->mii_dev, "reset failed\n");
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}
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smcphy_auto(sc);
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break;
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}
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/* Update the media status. */
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ukphy_status(sc);
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/* Callback if something changed. */
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mii_phy_update(sc, cmd);
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return (0);
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}
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static int
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smcphy_reset(struct mii_softc *sc)
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{
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u_int bmcr;
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int timeout;
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PHY_WRITE(sc, MII_BMCR, BMCR_RESET);
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for (timeout = 2; timeout > 0; timeout--) {
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DELAY(50000);
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bmcr = PHY_READ(sc, MII_BMCR);
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if ((bmcr & BMCR_RESET) == 0)
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break;
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}
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if (bmcr & BMCR_RESET) {
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return (EIO);
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}
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PHY_WRITE(sc, MII_BMCR, 0x3000);
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return (0);
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}
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static void
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smcphy_auto(struct mii_softc *sc)
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{
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uint16_t anar;
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anar = BMSR_MEDIA_TO_ANAR(sc->mii_capabilities) |
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ANAR_CSMA;
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if (sc->mii_flags & MIIF_DOPAUSE)
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anar |= ANAR_FC;
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PHY_WRITE(sc, MII_ANAR, anar);
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/* Apparently this helps. */
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anar = PHY_READ(sc, MII_ANAR);
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PHY_WRITE(sc, MII_BMCR, BMCR_AUTOEN | BMCR_STARTNEG);
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}
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