freebsd-dev/sys/dev/mii/mlphy.c
Poul-Henning Kamp 19ca58475e Remove unnecessary breaks.
Remove unused variables.
Add XXX comment where a break may be missing. [lxtphy.c]

Found by:       FlexeLint
2003-05-31 19:48:33 +00:00

435 lines
11 KiB
C

/*
* Copyright (c) 1997, 1998, 1999
* Bill Paul <wpaul@ctr.columbia.edu>. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Bill Paul.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``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 Bill Paul OR THE VOICES IN HIS HEAD
* 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.
*
* $FreeBSD$
*/
/*
* driver for Micro Linear 6692 PHYs
*
* The Micro Linear 6692 is a strange beast, and dealing with it using
* this code framework is tricky. The 6692 is actually a 100Mbps-only
* device, which means that a second PHY is required to support 10Mbps
* modes. However, even though the 6692 does not support 10Mbps modes,
* it can still advertise them when performing autonegotiation. If a
* 10Mbps mode is negotiated, we must program the registers of the
* companion PHY accordingly in addition to programming the registers
* of the 6692.
*
* This device also does not have vendor/device ID registers.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/malloc.h>
#include <net/if.h>
#include <net/if_media.h>
#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>
#include "miibus_if.h"
#define ML_STATE_AUTO_SELF 1
#define ML_STATE_AUTO_OTHER 2
struct mlphy_softc {
struct mii_softc ml_mii;
int ml_state;
int ml_linked;
};
static int mlphy_probe(device_t);
static int mlphy_attach(device_t);
static device_method_t mlphy_methods[] = {
/* device interface */
DEVMETHOD(device_probe, mlphy_probe),
DEVMETHOD(device_attach, mlphy_attach),
DEVMETHOD(device_detach, mii_phy_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
{ 0, 0 }
};
static devclass_t mlphy_devclass;
static driver_t mlphy_driver = {
"mlphy",
mlphy_methods,
sizeof(struct mlphy_softc)
};
DRIVER_MODULE(mlphy, miibus, mlphy_driver, mlphy_devclass, 0, 0);
static int mlphy_service(struct mii_softc *, struct mii_data *, int);
static void mlphy_reset(struct mii_softc *);
static void mlphy_status(struct mii_softc *);
static int
mlphy_probe(dev)
device_t dev;
{
struct mii_attach_args *ma;
device_t parent;
ma = device_get_ivars(dev);
parent = device_get_parent(device_get_parent(dev));
/*
* Micro Linear PHY reports oui == 0 model == 0
*/
if (MII_OUI(ma->mii_id1, ma->mii_id2) != 0 ||
MII_MODEL(ma->mii_id2) != 0)
return (ENXIO);
/*
* Make sure the parent is a `tl'. So far, I have only
* encountered the 6692 on an Olicom card with a ThunderLAN
* controller chip.
*/
if (strcmp(device_get_name(parent), "tl") != 0)
return (ENXIO);
device_set_desc(dev, "Micro Linear 6692 media interface");
return (0);
}
static int
mlphy_attach(dev)
device_t dev;
{
struct mlphy_softc *msc;
struct mii_softc *sc;
struct mii_attach_args *ma;
struct mii_data *mii;
msc = device_get_softc(dev);
sc = &msc->ml_mii;
ma = device_get_ivars(dev);
sc->mii_dev = device_get_parent(dev);
mii = device_get_softc(sc->mii_dev);
LIST_INSERT_HEAD(&mii->mii_phys, sc, mii_list);
sc->mii_inst = mii->mii_instance;
sc->mii_phy = ma->mii_phyno;
sc->mii_service = mlphy_service;
sc->mii_pdata = mii;
mii->mii_instance++;
#define ADD(m, c) ifmedia_add(&mii->mii_media, (m), (c), NULL)
#if 0 /* See above. */
ADD(IFM_MAKEWORD(IFM_ETHER, IFM_NONE, 0, sc->mii_inst),
BMCR_ISO);
#endif
ADD(IFM_MAKEWORD(IFM_ETHER, IFM_100_TX, IFM_LOOP, sc->mii_inst),
BMCR_LOOP|BMCR_S100);
sc->mii_flags &= ~MIIF_NOISOLATE;
mii_phy_reset(sc);
sc->mii_flags |= MIIF_NOISOLATE;
sc->mii_capabilities =
PHY_READ(sc, MII_BMSR) & ma->mii_capmask;
ma->mii_capmask = ~sc->mii_capabilities;
device_printf(dev, " ");
mii_add_media(sc);
printf("\n");
#undef ADD
MIIBUS_MEDIAINIT(sc->mii_dev);
return(0);
}
static int
mlphy_service(xsc, mii, cmd)
struct mii_softc *xsc;
struct mii_data *mii;
int cmd;
{
struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
int reg;
struct mii_softc *other = NULL;
struct mlphy_softc *msc = (struct mlphy_softc *)xsc;
struct mii_softc *sc = (struct mii_softc *)&msc->ml_mii;
device_t *devlist;
int devs, i;
/*
* See if there's another PHY on this bus with us.
* If so, we may need it for 10Mbps modes.
*/
device_get_children(msc->ml_mii.mii_dev, &devlist, &devs);
for (i = 0; i < devs; i++) {
if (strcmp(device_get_name(devlist[i]), "mlphy")) {
other = device_get_softc(devlist[i]);
break;
}
}
free(devlist, M_TEMP);
switch (cmd) {
case MII_POLLSTAT:
/*
* If we're not polling our PHY instance, just return.
*/
if (IFM_INST(ife->ifm_media) != sc->mii_inst)
return (0);
break;
case MII_MEDIACHG:
/*
* If the media indicates a different PHY instance,
* isolate ourselves.
*/
if (IFM_INST(ife->ifm_media) != sc->mii_inst) {
reg = PHY_READ(sc, MII_BMCR);
PHY_WRITE(sc, MII_BMCR, reg | BMCR_ISO);
return (0);
}
/*
* If the interface is not up, don't do anything.
*/
if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
break;
switch (IFM_SUBTYPE(ife->ifm_media)) {
case IFM_AUTO:
/*
* For autonegotiation, reset and isolate the
* companion PHY (if any) and then do NWAY
* autonegotiation ourselves.
*/
msc->ml_state = ML_STATE_AUTO_SELF;
if (other != NULL) {
mii_phy_reset(other);
PHY_WRITE(other, MII_BMCR, BMCR_ISO);
}
(void) mii_phy_auto(sc);
msc->ml_linked = 0;
return(0);
case IFM_10_T:
/*
* For 10baseT modes, reset and program the
* companion PHY (of any), then program ourselves
* to match. This will put us in pass-through
* mode and let the companion PHY do all the
* work.
*
* BMCR data is stored in the ifmedia entry.
*/
if (other != NULL) {
mii_phy_reset(other);
PHY_WRITE(other, MII_BMCR, ife->ifm_data);
}
PHY_WRITE(sc, MII_ANAR, mii_anar(ife->ifm_media));
PHY_WRITE(sc, MII_BMCR, ife->ifm_data);
msc->ml_state = 0;
break;
case IFM_100_TX:
/*
* For 100baseTX modes, reset and isolate the
* companion PHY (if any), then program ourselves
* accordingly.
*
* BMCR data is stored in the ifmedia entry.
*/
if (other != NULL) {
mii_phy_reset(other);
PHY_WRITE(other, MII_BMCR, BMCR_ISO);
}
PHY_WRITE(sc, MII_ANAR, mii_anar(ife->ifm_media));
PHY_WRITE(sc, MII_BMCR, ife->ifm_data);
msc->ml_state = 0;
break;
case IFM_100_T4:
/*
* XXX Not supported as a manual setting right now.
*/
return (EINVAL);
default:
break;
}
break;
case MII_TICK:
/*
* If we're not currently selected, just return.
*/
if (IFM_INST(ife->ifm_media) != sc->mii_inst)
return (0);
/*
* Is the interface even up?
*/
if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
return (0);
/*
* Only used for autonegotiation.
*/
if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO)
break;
/*
* Check to see if we have link. If we do, we don't
* need to restart the autonegotiation process. Read
* the BMSR twice in case it's latched.
* If we're in a 10Mbps mode, check the link of the
* 10Mbps PHY. Sometimes the Micro Linear PHY's
* linkstat bit will clear while the linkstat bit of
* the companion PHY will remain set.
*/
if (msc->ml_state == ML_STATE_AUTO_OTHER) {
reg = PHY_READ(other, MII_BMSR) |
PHY_READ(other, MII_BMSR);
} else {
reg = PHY_READ(sc, MII_BMSR) |
PHY_READ(sc, MII_BMSR);
}
if (reg & BMSR_LINK) {
if (!msc->ml_linked) {
msc->ml_linked = 1;
mlphy_status(sc);
}
break;
}
/*
* Only retry autonegotiation every 5 seconds.
*/
if (++sc->mii_ticks != 5)
return (0);
sc->mii_ticks = 0;
msc->ml_linked = 0;
mii->mii_media_active = IFM_NONE;
mii_phy_reset(sc);
msc->ml_state = ML_STATE_AUTO_SELF;
if (other != NULL) {
mii_phy_reset(other);
PHY_WRITE(other, MII_BMCR, BMCR_ISO);
}
mii_phy_auto(sc);
return(0);
}
/* Update the media status. */
if (msc->ml_state == ML_STATE_AUTO_OTHER) {
int other_inst;
other_inst = other->mii_inst;
other->mii_inst = sc->mii_inst;
(void) (*other->mii_service)(other, mii, MII_POLLSTAT);
other->mii_inst = other_inst;
sc->mii_media_active = other->mii_media_active;
sc->mii_media_status = other->mii_media_status;
} else
ukphy_status(sc);
/* Callback if something changed. */
mii_phy_update(sc, cmd);
return (0);
}
/*
* The Micro Linear PHY comes out of reset with the 'autoneg
* enable' bit set, which we don't want.
*/
static void
mlphy_reset(sc)
struct mii_softc *sc;
{
int reg;
mii_phy_reset(sc);
reg = PHY_READ(sc, MII_BMCR);
reg &= ~BMCR_AUTOEN;
PHY_WRITE(sc, MII_BMCR, reg);
return;
}
/*
* If we negotiate a 10Mbps mode, we need to check for an alternate
* PHY and make sure it's enabled and set correctly.
*/
static void
mlphy_status(sc)
struct mii_softc *sc;
{
struct mlphy_softc *msc = (struct mlphy_softc *)sc;
struct mii_data *mii = msc->ml_mii.mii_pdata;
struct mii_softc *other = NULL;
device_t *devlist;
int devs, i;
/* See if there's another PHY on the bus with us. */
device_get_children(msc->ml_mii.mii_dev, &devlist, &devs);
for (i = 0; i < devs; i++) {
if (strcmp(device_get_name(devlist[i]), "mlphy")) {
other = device_get_softc(devlist[i]);
break;
}
}
free(devlist, M_TEMP);
if (other == NULL)
return;
ukphy_status(sc);
if (IFM_SUBTYPE(mii->mii_media_active) != IFM_10_T) {
msc->ml_state = ML_STATE_AUTO_SELF;
mii_phy_reset(other);
PHY_WRITE(other, MII_BMCR, BMCR_ISO);
}
if (IFM_SUBTYPE(mii->mii_media_active) == IFM_10_T) {
msc->ml_state = ML_STATE_AUTO_OTHER;
mlphy_reset(&msc->ml_mii);
PHY_WRITE(&msc->ml_mii, MII_BMCR, BMCR_ISO);
mii_phy_reset(other);
mii_phy_auto(other);
}
return;
}