arm: Disable ATAGs support

With the exceptions of ds109, ds414, icnova-a20-swac, nokia_rx51 and
stemmy, disable ATAG support. A large number of platforms had enabled
support but never supported a kernel so old as to require it. Further,
some platforms are old enough to support both, but are well supported by
devicetree booting, and have been for a number of years. This is
because some of the ATAGs related functions have been re-used to provide
the same kind of information, but for devicetree or just generally to
inform the user. When needed still, rename these functions to
get_board_revision() instead, to avoid conflicts. In other cases, these
functions were simply unused, so drop them.

Cc: Andre Przywara <andre.przywara@arm.com>
Cc: Jagan Teki <jagan@amarulasolutions.com>
Cc: Phil Sutter <phil@nwl.cc>
Cc: Stefan Bosch <stefan_b@posteo.net>
Signed-off-by: Tom Rini <trini@konsulko.com>

arm: mvebu: board/Synology: Unify legacy kernel support

Move the relevant bits from ds109.{c,h} into common/ and adjust the code
to fit both DS109 and DS414. Moreover:

* Introduce syno_board_id() which translates CONFIG_MACH_TYPE into the
expected board ID tag value.

* Properly initialize isusbhost, mac and mtu fields from env variables.

* Set the right bootargs/bootcmd to correctly boot legacy kernel out of
the (DS414) box. Getting the ramdisk location right is a bit tedious.

Cc: Walter Schweizer <swwa@users.sourceforge.net>
Signed-off-by: Phil Sutter <phil@nwl.cc>
Reviewed-by: Stefan Roese <sr@denx.de>

mvebu: ds414: Move cmd_syno into ds414 directory

When we switch to including all linker lists in SPL it is important to
not include commands as that may lead to link errors due to other things
we have already discarded. In this case as we don't have other common
code nor other Synology borads, move the cmd_syno.c file (which claims
to be ds414 specific anyways!) into the ds414 directory and only build
it for non-SPL builds.

Signed-off-by: Tom Rini <trini@konsulko.com>

mvebu: ds414: Implement Synology specific command set

Synology keeps per item configuration in a dedicated 'partition' in SPI
flash, namely the one named 'vendor' in DTS file. It contains the two
NICs MAC addresses as well as the item's serial number. I didn't find a
way to have this information extracted automatically, therefore
implemented 'syno populate_env' command which extracts the three values
and puts them into environment. To make things permanent though, one has
to 'saveenv'.

Another command is 'syno clk_gate', which allows to change the clock
gating which is done in DS414 board file.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Stefan Roese <sr@denx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>

arm: mvebu: board/Synology: Unify legacy kernel support

Move the relevant bits from ds109.{c,h} into common/ and adjust the code
to fit both DS109 and DS414. Moreover:

* Introduce syno_board_id() which translates CONFIG_MACH_TYPE into the
expected board ID tag value.

* Properly initialize isusbhost, mac and mtu fields from env variables.

* Set the right bootargs/bootcmd to correctly boot legacy kernel out of
the (DS414) box. Getting the ramdisk location right is a bit tedious.

Cc: Walter Schweizer <swwa@users.sourceforge.net>
Signed-off-by: Phil Sutter <phil@nwl.cc>
Reviewed-by: Stefan Roese <sr@denx.de>

mvebu: ds414: Move cmd_syno into ds414 directory

When we switch to including all linker lists in SPL it is important to
not include commands as that may lead to link errors due to other things
we have already discarded. In this case as we don't have other common
code nor other Synology borads, move the cmd_syno.c file (which claims
to be ds414 specific anyways!) into the ds414 directory and only build
it for non-SPL builds.

Signed-off-by: Tom Rini <trini@konsulko.com>

mvebu: ds414: Implement Synology specific command set

Synology keeps per item configuration in a dedicated 'partition' in SPI
flash, namely the one named 'vendor' in DTS file. It contains the two
NICs MAC addresses as well as the item's serial number. I didn't find a
way to have this information extracted automatically, therefore
implemented 'syno populate_env' command which extracts the three values
and puts them into environment. To make things permanent though, one has
to 'saveenv'.

Another command is 'syno clk_gate', which allows to change the clock
gating which is done in DS414 board file.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Stefan Roese <sr@denx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>