Add etherswitch support to mge

This commit introduces support for etherswitch devices that utilize SMI as
a way of accessing its registers. SMI register is located in address space
of mge -- access to it was exported through MDIO interface.

Attachment functions were enhanced so as to ensure proper initialisation
in both cases: 1) PHYs attached directly to mge, 2) PHYs attached to
switch device and switch attached to mge. Attachment of etherswitch device
depends on dts entry with compatible="mrvl,sw" property. If none is found,
typical PHY attachment procedure follows.

In case of switch attached, PHYs' status and configuration is accessible
via etherswitchcfg, and ifconfig shows always-up, non-configurable mge
interfaces.

Due to the fact that there may be simultaneous accessess to SMI
registers (e.g. from PHY attached to one of mge instances and switch
to the other), SMI access interlock was added. It is SX lock,
because sleep ability is necessary -- busy-waiting would result
in poor performance due to long delays required by hardware.
Underlying switch driver is obliged to use sleepable locks as well.

Reviewed by:    adrian
Obtained from:  Semihalf
Submitted by:   Bartosz Szczepanek <bsz@semihalf.com>
Differential revision: https://reviews.freebsd.org/D3900

8 files changed, 8 insertions, 0 deletions

diff --git a/sys/arm/conf/ARMADAXP b/sys/arm/conf/ARMADAXP
index 6d51c16..f1b2776 100644
--- a/sys/arm/conf/ARMADAXP
+++ b/sys/arm/conf/ARMADAXP
@@ -95,6 +95,7 @@ device		iicbus
 device		ether
 device		mge			# Marvell Gigabit Ethernet controller
 device		mii
+device		mdio
 device		e1000phy
 device		bpf
 options 	DEVICE_POLLING
diff --git a/sys/arm/conf/DB-78XXX b/sys/arm/conf/DB-78XXX
index e59e426..024593c 100644
--- a/sys/arm/conf/DB-78XXX
+++ b/sys/arm/conf/DB-78XXX
@@ -66,6 +66,7 @@ device		uart
 device		ether
 device		mge			# Marvell Gigabit Ethernet controller
 device		mii
+device		mdio
 device		e1000phy
 device		bpf
 
diff --git a/sys/arm/conf/DB-88F5XXX b/sys/arm/conf/DB-88F5XXX
index f1729f0..5fd96fc 100644
--- a/sys/arm/conf/DB-88F5XXX
+++ b/sys/arm/conf/DB-88F5XXX
@@ -65,6 +65,7 @@ device		uart
 device		ether
 device		mge			# Marvell Gigabit Ethernet controller
 device		mii
+device		mdio
 device		e1000phy
 device		bpf
 options 	DEVICE_POLLING
diff --git a/sys/arm/conf/DB-88F6XXX b/sys/arm/conf/DB-88F6XXX
index ec3eff0..c3f238c 100644
--- a/sys/arm/conf/DB-88F6XXX
+++ b/sys/arm/conf/DB-88F6XXX
@@ -67,6 +67,7 @@ device		uart
 device		ether
 device		mge			# Marvell Gigabit Ethernet controller
 device		mii
+device		mdio
 device		e1000phy
 device		bpf
 
diff --git a/sys/arm/conf/DOCKSTAR b/sys/arm/conf/DOCKSTAR
index b00b3bf..d7fa96e 100644
--- a/sys/arm/conf/DOCKSTAR
+++ b/sys/arm/conf/DOCKSTAR
@@ -96,6 +96,7 @@ device		uart
 # Networking
 device		mge			# Marvell Gigabit Ethernet controller
 device		mii
+device		mdio
 device		e1000phy
 
 # USB
diff --git a/sys/arm/conf/DREAMPLUG-1001 b/sys/arm/conf/DREAMPLUG-1001
index 3baacaa..3277b43 100644
--- a/sys/arm/conf/DREAMPLUG-1001
+++ b/sys/arm/conf/DREAMPLUG-1001
@@ -100,6 +100,7 @@ device		uart
 # Networking
 device		mge			# Marvell Gigabit Ethernet controller
 device		mii
+device		mdio
 device		e1000phy
 
 # USB
diff --git a/sys/arm/conf/SHEEVAPLUG b/sys/arm/conf/SHEEVAPLUG
index 507ba75..5d89c2d 100644
--- a/sys/arm/conf/SHEEVAPLUG
+++ b/sys/arm/conf/SHEEVAPLUG
@@ -60,6 +60,7 @@ device		uart
 device		ether
 device		mge			# Marvell Gigabit Ethernet controller
 device		mii
+device		mdio
 device		e1000phy
 device		bpf
 options 	DEVICE_POLLING
diff --git a/sys/arm/conf/TS7800 b/sys/arm/conf/TS7800
index 1a565c4..1b62e59 100644
--- a/sys/arm/conf/TS7800
+++ b/sys/arm/conf/TS7800
@@ -60,6 +60,7 @@ device		uart
 device		ether
 device		mge			# Marvell Gigabit Ethernet controller
 device		mii
+device		mdio
 device		e1000phy
 device		bpf
 options 	HZ=1000