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freebsd-dev/sys/dev/mii/rdcphy.c
Marius Strobl 3fcb7a5365 - Remove attempts to implement setting of BMCR_LOOP/MIIF_NOLOOP 
(reporting IFM_LOOP based on BMCR_LOOP is left in place though as
  it might provide useful for debugging). For most mii(4) drivers it
  was unclear whether the PHYs driven by them actually support
  loopback or not. Moreover, typically loopback mode also needs to
  be activated on the MAC, which none of the Ethernet drivers using
  mii(4) implements. Given that loopback media has no real use (and
  obviously hardly had a chance to actually work) besides for driver
  development (which just loopback mode should be sufficient for
  though, i.e one doesn't necessary need support for loopback media)
  support for it is just dropped as both NetBSD and OpenBSD already
  did quite some time ago.
- Let mii_phy_add_media() also announce the support of IFM_NONE.
- Restructure the PHY entry points to use a structure of entry points
  instead of discrete function pointers, and extend this to include
  a "reset" entry point. Make sure any PHY-specific reset routine is
  always used, and provide one for lxtphy(4) which disables MII
  interrupts (as is done for a few other PHYs we have drivers for).
  This includes changing NIC drivers which previously just called the
  generic mii_phy_reset() to now actually call the PHY-specific reset
  routine, which might be crucial in some cases. While at it, the
  redundant checks in these NIC drivers for mii->mii_instance not being
  zero before calling the reset routines were removed because as soon
  as one PHY driver attaches mii->mii_instance is incremented and we
  hardly can end up in their media change callbacks etc if no PHY driver
  has attached as mii_attach() would have failed in that case and not
  attach a miibus(4) instance.
  Consequently, NIC drivers now no longer should call mii_phy_reset()
  directly, so it was removed from EXPORT_SYMS.
- Add a mii_phy_dev_attach() as a companion helper to mii_phy_dev_probe().
  The purpose of that function is to perform the common steps to attach
  a PHY driver instance and to hook it up to the miibus(4) instance and to
  optionally also handle the probing, addition and initialization of the
  supported media. So all a PHY driver without any special requirements
  has to do in its bus attach method is to call mii_phy_dev_attach()
  along with PHY-specific MIIF_* flags, a pointer to its PHY functions
  and the add_media set to one. All PHY drivers were updated to take
  advantage of mii_phy_dev_attach() as appropriate. Along with these
  changes the capability mask was added to the mii_softc structure so
  PHY drivers taking advantage of mii_phy_dev_attach() but still
  handling media on their own do not need to fiddle with the MII attach
  arguments anyway.
- Keep track of the PHY offset in the mii_softc structure. This is done
  for compatibility with NetBSD/OpenBSD.
- Keep track of the PHY's OUI, model and revision in the mii_softc
  structure. Several PHY drivers require this information also after
  attaching and previously had to wrap their own softc around mii_softc.
  NetBSD/OpenBSD also keep track of the model and revision on their
  mii_softc structure. All PHY drivers were updated to take advantage
  as appropriate.
- Convert the mebers of the MII data structure to unsigned where
  appropriate. This is partly inspired by NetBSD/OpenBSD.
- According to IEEE 802.3-2002 the bits actually have to be reversed
  when mapping an OUI to the MII ID registers. All PHY drivers and
  miidevs where changed as necessary. Actually this now again allows to
  largely share miidevs with NetBSD, which fixed this problem already
  9 years ago. Consequently miidevs was synced as far as possible.
- Add MIIF_NOMANPAUSE and mii_phy_flowstatus() calls to drivers that
  weren't explicitly converted to support flow control before. It's
  unclear whether flow control actually works with these but typically
  it should and their net behavior should be more correct with these
  changes in place than without if the MAC driver sets MIIF_DOPAUSE.

Obtained from:	NetBSD (partially)
Reviewed by:	yongari (earlier version), silence on arch@ and net@
2011-05-03 19:51:29 +00:00

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/*-
* Copyright (c) 2010, Pyun YongHyeon <yongari@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 unmodified, 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 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 THE AUTHOR OR CONTRIBUTORS 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Driver for the RDC Semiconductor R6040 10/100 PHY.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/socket.h>
#include <sys/bus.h>
#include <net/if.h>
#include <net/if_media.h>
#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>
#include "miidevs.h"
#include <dev/mii/rdcphyreg.h>
#include "miibus_if.h"
static device_probe_t rdcphy_probe;
static device_attach_t rdcphy_attach;
struct rdcphy_softc {
struct mii_softc mii_sc;
int mii_link_tick;
#define RDCPHY_MANNEG_TICK 3
};
static device_method_t rdcphy_methods[] = {
/* device interface */
DEVMETHOD(device_probe, rdcphy_probe),
DEVMETHOD(device_attach, rdcphy_attach),
DEVMETHOD(device_detach, mii_phy_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
KOBJMETHOD_END
};
static devclass_t rdcphy_devclass;
static driver_t rdcphy_driver = {
"rdcphy",
rdcphy_methods,
sizeof(struct rdcphy_softc)
};
DRIVER_MODULE(rdcphy, miibus, rdcphy_driver, rdcphy_devclass, 0, 0);
static int rdcphy_service(struct mii_softc *, struct mii_data *, int);
static void rdcphy_status(struct mii_softc *);
static const struct mii_phydesc rdcphys[] = {
MII_PHY_DESC(RDC, R6040),
MII_PHY_END
};
static const struct mii_phy_funcs rdcphy_funcs = {
rdcphy_service,
rdcphy_status,
mii_phy_reset
};
static int
rdcphy_probe(device_t dev)
{
return (mii_phy_dev_probe(dev, rdcphys, BUS_PROBE_DEFAULT));
}
static int
rdcphy_attach(device_t dev)
{
mii_phy_dev_attach(dev, MIIF_NOMANPAUSE, &rdcphy_funcs, 1);
return (0);
}
static int
rdcphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
{
struct rdcphy_softc *rsc;
struct ifmedia_entry *ife;
rsc = (struct rdcphy_softc *)sc;
ife = mii->mii_media.ifm_cur;
switch (cmd) {
case MII_POLLSTAT:
break;
case MII_MEDIACHG:
/*
* If the interface is not up, don't do anything.
*/
if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
break;
mii_phy_setmedia(sc);
switch (IFM_SUBTYPE(ife->ifm_media)) {
case IFM_100_TX:
case IFM_10_T:
/*
* Report fake lost link event to parent
* driver. This will stop MAC of parent
* driver and make it possible to reconfigure
* MAC after completion of link establishment.
* Note, the parent MAC seems to require
* restarting MAC when underlying any PHY
* configuration was changed even if the
* resolved speed/duplex was not changed at
* all.
*/
mii->mii_media_status = 0;
mii->mii_media_active = IFM_ETHER | IFM_NONE;
rsc->mii_link_tick = RDCPHY_MANNEG_TICK;
/* Immediately report link down. */
mii_phy_update(sc, MII_MEDIACHG);
return (0);
default:
break;
}
break;
case MII_TICK:
if (mii_phy_tick(sc) == EJUSTRETURN)
return (0);
if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO) {
/*
* It seems the PHY hardware does not correctly
* report link status changes when manual link
* configuration is in progress. It is also
* possible for the PHY to complete establishing
* a link within one second such that mii(4)
* did not notice the link change. To workaround
* the issue, emulate lost link event and wait
* for 3 seconds when manual link configuration
* is in progress. 3 seconds would be long
* enough to absorb transient link flips.
*/
if (rsc->mii_link_tick > 0) {
rsc->mii_link_tick--;
return (0);
}
}
break;
}
/* Update the media status. */
PHY_STATUS(sc);
/* Callback if something changed. */
mii_phy_update(sc, cmd);
return (0);
}
static void
rdcphy_status(struct mii_softc *sc)
{
struct mii_data *mii;
struct ifmedia_entry *ife;
int bmsr, bmcr, physts;
mii = sc->mii_pdata;
ife = mii->mii_media.ifm_cur;
mii->mii_media_status = IFM_AVALID;
mii->mii_media_active = IFM_ETHER;
bmsr = PHY_READ(sc, MII_BMSR) | PHY_READ(sc, MII_BMSR);
physts = PHY_READ(sc, MII_RDCPHY_STATUS);
if ((physts & STATUS_LINK_UP) != 0)
mii->mii_media_status |= IFM_ACTIVE;
bmcr = PHY_READ(sc, MII_BMCR);
if ((bmcr & BMCR_ISO) != 0) {
mii->mii_media_active |= IFM_NONE;
mii->mii_media_status = 0;
return;
}
if ((bmcr & BMCR_LOOP) != 0)
mii->mii_media_active |= IFM_LOOP;
if ((bmcr & BMCR_AUTOEN) != 0) {
if ((bmsr & BMSR_ACOMP) == 0) {
/* Erg, still trying, I guess... */
mii->mii_media_active |= IFM_NONE;
return;
}
}
switch (physts & STATUS_SPEED_MASK) {
case STATUS_SPEED_100:
mii->mii_media_active |= IFM_100_TX;
break;
case STATUS_SPEED_10:
mii->mii_media_active |= IFM_10_T;
break;
default:
mii->mii_media_active |= IFM_NONE;
return;
}
if ((physts & STATUS_FULL_DUPLEX) != 0)
mii->mii_media_active |= IFM_FDX | mii_phy_flowstatus(sc);
else
mii->mii_media_active |= IFM_HDX;
}
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