Fix a bug that "ifconfig xx0 media none" set LINK_STATE_UNKNOWN instead of
LINK_STATE_DOWN.

XXX We should check for other PHY drivers, too.

Rename PSSR_* to MAKPHY_PSSR_* and IGPHY_PSSR_* to avoid conflict.
No functional change.

s/MII_IGPHY_/IGPHY_/. No functional change.

- Remove the waitfor argument from mii_phy_auto().
- Whitespace fix.

Define and implement a locking protocol for the ifmedia / mii layers:
- MP-safe drivers provide a mutex to ifmedia that is used to serialize
access to media-related structures / hardware regsiters.

Define and implement a locking protocol for the ifmedia / mii layers:
- MP-safe drivers provide a mutex to ifmedia that is used to serialize
access to media-related structures / hardware regsiters. Converted
drivers use the new ifmedia_init_with_lock() function for this. The
new name is provided to ease the transition.
- Un-converted drivers continue to call ifmedia_init(), which will supply
a compatibility lock to be used instead. Several media-related entry
points must be aware of this compatibility lock, and are able to acquire
it recursively a limited number of times, if needed. This is a SPIN
mutex with priority IPL_NET.
- This same lock is used to serialize access to PHY registers and other
MII-related data structures.

The PHY drivers are modified to acquire and release the lock, as needed,
and assert the lock is held as a diagnostic aid.

The "usbnet" framework has had an overhaul of its internal locking
protocols to fit in with the media / mii changes, and the drivers adapted.

USB wifi drivers have been changed to provide their own adaptive mutex
to the ifmedia later via a new ieee80211_media_init_with_lock() function.
This is required because the USB drivers need an adaptive mutex.

Besised "usbnet", a few other drivers are converted: vmx, wm, ixgbe / ixv.

mcx also now calls ifmedia_init_with_lock() because it needs to also use
an adaptive mutex. The mcx driver still needs to be fully converted to
NET_MPSAFE.

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- Simplify sc->mii_anegticks setting. Same as FreeBSD.

Don't set the default value not in the attach function. Instead, set the
default value (MII_ANEGTICKS) first in the beginning of the
mii

- Simplify sc->mii_anegticks setting. Same as FreeBSD.

Don't set the default value not in the attach function. Instead, set the
default value (MII_ANEGTICKS) first in the beginning of the
mii_phy_add_media(). The function already has the code to change the value to
MII_ANEGTICKS_GIGE if it's gigabit capable.

- Remove extra pmf_device_register() call. It's done in mii_phy_add_media().

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KNF. No functional change.

use a macro to tidy up the phydesc array initialization, from FreeBSD

Change MII PHY read/write API from:

int (*mii_readreg_t)(device_t, int, int);
void (*mii_writereg_t)(device_t, int, int, int);
to:

int (*mii_readreg_t)(device_t, int, int, uint16_t *);
int (*mi

Change MII PHY read/write API from:

int (*mii_readreg_t)(device_t, int, int);
void (*mii_writereg_t)(device_t, int, int, int);
to:

int (*mii_readreg_t)(device_t, int, int, uint16_t *);
int (*mii_writereg_t)(device_t, int, int, uint16_t);

Now we can test if a read/write operation failed or not by the return value.

In 802.3 spec says that the PHY shall not respond to read/write transaction
to the unimplemented register(22.2.4.3). Detecting timeout can be used to
check whether a register is implemented or not (if the register conforms to
the spec). ukphy(4) can be used this for MII_MMDACR and MII_MMDAADR.

Note that I noticed that the following code do infinite loop in the
read/wirte function. If it accesses unimplemented PHY register, it will hang.
It should be fixed:

arm/at91/at91emac.c
arm/ep93xx/epe.c
arm/omap/omapl1x_emac.c
mips/ralink/ralink_eth.c
arch/powerpc/booke/dev/pq3etsec.c(read)
dev/cadence/if_cemac.c <- hkenken
dev/ic/lan9118.c


Tested with the following device:

axe+ukphy
axe+rgephy
axen+rgephy (tested by Andrius V)
wm+atphy
wm+ukphy
wm+igphy
wm+ihphy
wm+makphy
sk+makphy
sk+brgphy
sk+gentbi
msk+makphy
sip+icsphy
sip+ukphy
re+rgephy
bge+brgphy
bnx+brgphy
gsip+gphyter
rtk+rlphy
fxp+inphy (tested by Andrius V)
tlp+acphy
ex+exphy
epic+qsphy
vge+ciphy (tested by Andrius V)
vr+ukphy (tested by Andrius V)
vte+ukphy (tested by Andrius V)

Not tested (MAC):
arm:at91emac
arm:cemac
arm:epe
arm:geminigmac
arm:enet
arm:cpsw
arm:emac(omac)
arm:emac(sunxi)
arm:npe
evbppc:temac
macppc:bm
macppc:gm
mips:aumac
mips:ae
mips:cnmac
mips:reth
mips:sbmac
playstation2:smap
powerpc:tsec
powerpc:emac(ibm4xx)
sgimips:mec
sparc:be
sf
ne(ax88190, dl10019)
awge
ep
gem
hme
smsh
mtd
sm
age
alc
ale
bce
cas
et
jme
lii
nfe
pcn
ste
stge
tl
xi
aue
mue
smsc
udav
url

Not tested (PHY):
amhphy
bmtphy
dmphy
etphy
glxtphy
ikphy
iophy
lxtphy
nsphyter
pnaphy
rdcphy
sqphy
tlphy
tqphy
urlphy

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Whitespace fixes. No functional change.

Update comment. SmartSpeed workaroud code was added in rev. 1.5. No functional
change.

KNF. Remove extra spaces. No functional change.

igphy(4),ukphy(4): Set mii_mpd_* entries.
wm(4): check PHY type correctly.

add some _KERNEL_OPT as the finishing touch

IFM_FDX and IFM_HDX use different bit, so set IFM_HDX bit if it's not full
duplex. For many drivers, it recognize half duplex if IFM_FDX isn't set,
but not for others. Same as {Free|Open}BSD.

Style fix. No functional change.

Add two workarounds for ICH8 with igp3.
- Workaround for 82566 Kumeran PCS lock loss.
- WOL from S5 stops working.

Sync with Intel's original em driver:
- Add dspcode for igp3 and use it when the EEPROM isn't available.
- Add some delays.
- Stop the PHY transmitter before patching the DSP code and restart it afte

Sync with Intel's original em driver:
- Add dspcode for igp3 and use it when the EEPROM isn't available.
- Add some delays.
- Stop the PHY transmitter before patching the DSP code and restart it after wrote.
- Save and restore register 0x2f5b.

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Re-enable igphy's 82566 support.
- Patch for the DSP code is only for 8254[17] and we have to apply the
different patches between rev. 1 and rev. 2.
- The workaround for analog fuse is only for

Re-enable igphy's 82566 support.
- Patch for the DSP code is only for 8254[17] and we have to apply the
different patches between rev. 1 and rev. 2.
- The workaround for analog fuse is only for 82547 rev. 1.
- The workaround for smartspeed is only for 8254[17]

see http://mail-index.netbsd.org/tech-net/2009/08/05/msg001546.html

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Later generation 82566 IGP PHYs have problems with media changes to 100Mb and
10Mb; it appears that the SmartSpeed workaround and dspcode in this PHY are
aimed at earlier generation IGPs. Remove ref

Later generation 82566 IGP PHYs have problems with media changes to 100Mb and
10Mb; it appears that the SmartSpeed workaround and dspcode in this PHY are
aimed at earlier generation IGPs. Remove reference to 82566s, allowing
them to fall through to choose other PHYs.

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Reduce code duplication: most PHY drivers call mii_phy_add_media()
when they attach to the device tree, so call pmf_device_register(9)
once there instead of once in more than twenty drivers.

device_t/softc split for all mii(4) devices, and other related
cosmetic changes.

Remove clause 3 and 4 from TNF licenses

use aprint_*_dev and device_xname

Merge jmcneill-pm branch.