net: wan: remove the lanmedia (lmc) driver

The driver for LAN Media WAN interfaces spews build warnings on
microblaze. The virt_to_bus() calls discard the volatile keyword.
The right thing to do would be to migrate this driver to a modern
DMA API but it seems unlikely anyone is actually using it.
There had been no fixes or functional changes here since
the git era begun.

Let's remove this driver, there isn't much changing in the APIs,
if users come forward we can apologize and revert.

Link: https://lore.kernel.org/all/20220321144013.440d7fc0@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com/
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/mips/configs/gpr_defconfig

@@ -214,7 +214,6 @@ CONFIG_ATH_DEBUG=y
 CONFIG_ATH5K=y
 CONFIG_ATH5K_DEBUG=y
 CONFIG_WAN=y
-CONFIG_LANMEDIA=m
 CONFIG_HDLC=m
 CONFIG_HDLC_RAW=m
 CONFIG_HDLC_RAW_ETH=m

arch/mips/configs/mtx1_defconfig

@@ -363,7 +363,6 @@ CONFIG_USB_AN2720=y
 CONFIG_USB_EPSON2888=y
 CONFIG_USB_SIERRA_NET=m
 CONFIG_WAN=y
-CONFIG_LANMEDIA=m
 CONFIG_HDLC=m
 CONFIG_HDLC_RAW=m
 CONFIG_HDLC_RAW_ETH=m

drivers/net/wan/Kconfig

@@ -57,34 +57,6 @@ config COSA
 	  The driver will be compiled as a module: the
 	  module will be called cosa.
 
-#
-# Lan Media's board. Currently 1000, 1200, 5200, 5245
-#
-config LANMEDIA
-	tristate "LanMedia Corp. SSI/V.35, T1/E1, HSSI, T3 boards"
-	depends on PCI && VIRT_TO_BUS && HDLC
-	help
-	  Driver for the following Lan Media family of serial boards:
-
-	  - LMC 1000 board allows you to connect synchronous serial devices
-	  (for example base-band modems, or any other device with the X.21,
-	  V.24, V.35 or V.36 interface) to your Linux box.
-
-	  - LMC 1200 with on board DSU board allows you to connect your Linux
-	  box directly to a T1 or E1 circuit.
-
-	  - LMC 5200 board provides a HSSI interface capable of running up to
-	  52 Mbits per second.
-
-	  - LMC 5245 board connects directly to a T3 circuit saving the
-	  additional external hardware.
-
-	  To change setting such as clock source you will need lmcctl.
-	  It is available at <ftp://ftp.lanmedia.com/> (broken link).
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called lmc.
-
 # There is no way to detect a Sealevel board. Force it modular
 config SEALEVEL_4021
 	tristate "Sealevel Systems 4021 support"

drivers/net/wan/Makefile

@@ -19,8 +19,6 @@ obj-$(CONFIG_SEALEVEL_4021)	+= z85230.o	sealevel.o
 obj-$(CONFIG_COSA)		+= cosa.o
 obj-$(CONFIG_FARSYNC)		+= farsync.o
 
-obj-$(CONFIG_LANMEDIA)		+= lmc/
-
 obj-$(CONFIG_LAPBETHER)		+= lapbether.o
 obj-$(CONFIG_N2)		+= n2.o
 obj-$(CONFIG_C101)		+= c101.o