d00275330d
MII-compliant PHY drivers. Many 10/100 ethernet NICs available today either use an MII transceiver or have built-in transceivers that can be programmed using an MII interface. It makes sense then to separate this support out into common code instead of duplicating it in all of the NIC drivers. The mii code also handles all of the media detection, selection and reporting via the ifmedia interface. This is basically the same code from NetBSD's /sys/dev/mii, except it's been adapted to FreeBSD's bus architecture. The advantage to this is that it automatically allows everything to be turned into a loadable module. There are some common functions for use in drivers once an miibus has been attached (mii_mediachg(), mii_pollstat(), mii_tick()) as well as individual PHY drivers. There is also a generic driver for all PHYs that aren't handled by a specific driver. It's possible to do this because all 10/100 PHYs implement the same general register set in addition to their vendor-specific register sets, so for the most part you can use one driver for pretty much any PHY. There are a couple of oddball exceptions though, hence the need to have specific drivers. There are two layers: the generic "miibus" layer and the PHY driver layer. The drivers are child devices of "miibus" and the "miibus" is a child of a given NIC driver. The "miibus" code and the PHY drivers can actually be compiled and kldoaded as completely separate modules or compiled together into one module. For the moment I'm using the latter approach since the code is relatively small. Currently there are only three PHY drivers here: the generic driver, the built-in 3Com XL driver and the NS DP83840 driver. I'll be adding others later as I convert various NIC drivers to use this code. I realize that I'm cvs adding this stuff instead of importing it onto a separate vendor branch, but in my opinion the import approach doesn't really offer any significant advantage: I'm going to be maintaining this stuff and writing my own PHY drivers one way or the other.
265 lines
6.6 KiB
C
265 lines
6.6 KiB
C
/* $NetBSD: mii_physubr.c,v 1.5 1999/08/03 19:41:49 drochner Exp $ */
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/*-
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* Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Subroutines common to all PHYs.
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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 <machine/clock.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 "miibus_if.h"
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#if !defined(lint)
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static const char rcsid[] =
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"$Id$";
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#endif
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void mii_phy_auto_timeout __P((void *));
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int
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mii_phy_auto(mii, waitfor)
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struct mii_softc *mii;
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int waitfor;
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{
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int bmsr, i;
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if ((mii->mii_flags & MIIF_DOINGAUTO) == 0) {
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PHY_WRITE(mii, MII_ANAR,
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BMSR_MEDIA_TO_ANAR(mii->mii_capabilities) | ANAR_CSMA);
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PHY_WRITE(mii, MII_BMCR, BMCR_AUTOEN | BMCR_STARTNEG);
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}
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if (waitfor) {
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/* Wait 500ms for it to complete. */
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for (i = 0; i < 500; i++) {
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if ((bmsr = PHY_READ(mii, MII_BMSR)) & BMSR_ACOMP)
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return (0);
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DELAY(1000);
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#if 0
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if ((bmsr & BMSR_ACOMP) == 0)
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printf("%s: autonegotiation failed to complete\n",
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mii->mii_dev.dv_xname);
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#endif
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}
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/*
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* Don't need to worry about clearing MIIF_DOINGAUTO.
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* If that's set, a timeout is pending, and it will
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* clear the flag.
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*/
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return (EIO);
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}
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/*
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* Just let it finish asynchronously. This is for the benefit of
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* the tick handler driving autonegotiation. Don't want 500ms
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* delays all the time while the system is running!
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*/
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if ((mii->mii_flags & MIIF_DOINGAUTO) == 0) {
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mii->mii_flags |= MIIF_DOINGAUTO;
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timeout(mii_phy_auto_timeout, mii, hz >> 1);
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}
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return (EJUSTRETURN);
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}
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void
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mii_phy_auto_timeout(arg)
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void *arg;
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{
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struct mii_softc *mii = arg;
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int s, bmsr;
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s = splnet();
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mii->mii_flags &= ~MIIF_DOINGAUTO;
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bmsr = PHY_READ(mii, MII_BMSR);
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#if 0
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if ((bmsr & BMSR_ACOMP) == 0)
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printf("%s: autonegotiation failed to complete\n",
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sc->sc_dev.dv_xname);
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#endif
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/* Update the media status. */
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(void) (*mii->mii_service)(mii, mii->mii_pdata, MII_POLLSTAT);
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splx(s);
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}
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void
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mii_phy_reset(mii)
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struct mii_softc *mii;
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{
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int reg, i;
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if (mii->mii_flags & MIIF_NOISOLATE)
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reg = BMCR_RESET;
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else
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reg = BMCR_RESET | BMCR_ISO;
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PHY_WRITE(mii, MII_BMCR, reg);
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/* Wait 100ms for it to complete. */
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for (i = 0; i < 100; i++) {
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reg = PHY_READ(mii, MII_BMCR);
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if ((reg & BMCR_RESET) == 0)
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break;
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DELAY(1000);
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}
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if (mii->mii_inst != 0 && ((mii->mii_flags & MIIF_NOISOLATE) == 0))
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PHY_WRITE(mii, MII_BMCR, reg | BMCR_ISO);
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}
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/*
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* Given an ifmedia word, return the corresponding ANAR value.
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*/
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int
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mii_anar(media)
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int media;
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{
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int rv;
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switch (media & (IFM_TMASK|IFM_NMASK|IFM_FDX)) {
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case IFM_ETHER|IFM_10_T:
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rv = ANAR_10|ANAR_CSMA;
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break;
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case IFM_ETHER|IFM_10_T|IFM_FDX:
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rv = ANAR_10_FD|ANAR_CSMA;
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break;
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case IFM_ETHER|IFM_100_TX:
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rv = ANAR_TX|ANAR_CSMA;
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break;
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case IFM_ETHER|IFM_100_TX|IFM_FDX:
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rv = ANAR_TX_FD|ANAR_CSMA;
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break;
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case IFM_ETHER|IFM_100_T4:
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rv = ANAR_T4|ANAR_CSMA;
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break;
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default:
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rv = 0;
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break;
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}
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return (rv);
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}
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/*
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* Given a BMCR value, return the corresponding ifmedia word.
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*/
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int
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mii_media_from_bmcr(bmcr)
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int bmcr;
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{
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int rv = IFM_ETHER;
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if (bmcr & BMCR_S100)
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rv |= IFM_100_TX;
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else
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rv |= IFM_10_T;
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if (bmcr & BMCR_FDX)
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rv |= IFM_FDX;
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return (rv);
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}
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/*
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* Initialize generic PHY media based on BMSR, called when a PHY is
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* attached. We expect to be set up to print a comma-separated list
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* of media names. Does not print a newline.
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*/
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void
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mii_add_media(mii, bmsr, instance)
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struct mii_data *mii;
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int bmsr, instance;
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{
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const char *sep = "";
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#define ADD(m, c) ifmedia_add(&mii->mii_media, (m), (c), NULL)
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#define PRINT(s) printf("%s%s", sep, s); sep = ", "
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if (bmsr & BMSR_10THDX) {
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ADD(IFM_MAKEWORD(IFM_ETHER, IFM_10_T, 0, instance), 0);
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PRINT("10baseT");
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}
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if (bmsr & BMSR_10TFDX) {
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ADD(IFM_MAKEWORD(IFM_ETHER, IFM_10_T, IFM_FDX, instance),
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BMCR_FDX);
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PRINT("10baseT-FDX");
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}
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if (bmsr & BMSR_100TXHDX) {
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ADD(IFM_MAKEWORD(IFM_ETHER, IFM_100_TX, 0, instance),
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BMCR_S100);
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PRINT("100baseTX");
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}
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if (bmsr & BMSR_100TXFDX) {
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ADD(IFM_MAKEWORD(IFM_ETHER, IFM_100_TX, IFM_FDX, instance),
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BMCR_S100|BMCR_FDX);
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PRINT("100baseTX-FDX");
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}
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if (bmsr & BMSR_100T4) {
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/*
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* XXX How do you enable 100baseT4? I assume we set
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* XXX BMCR_S100 and then assume the PHYs will take
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* XXX watever action is necessary to switch themselves
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* XXX into T4 mode.
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*/
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ADD(IFM_MAKEWORD(IFM_ETHER, IFM_100_T4, 0, instance),
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BMCR_S100);
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PRINT("100baseT4");
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}
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if (bmsr & BMSR_ANEG) {
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ADD(IFM_MAKEWORD(IFM_ETHER, IFM_AUTO, 0, instance),
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BMCR_AUTOEN);
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PRINT("auto");
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}
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#undef ADD
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#undef PRINT
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}
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