linux-phytec-ti

net: prueth: Add TI PRUSS Ethernet driver support of switch firmware

This patch adds the Ethernet driver support of switch firmware
on AM571x idks. It should also work on AM572x or AM574x idks.

Current version does not support changing to/from firmware type
during runtime. Thus in order to load the switch firmware, the
following needs to be added to uboot's boot args

ti_prueth.pruss1_ethtype=3, ti_prueth.pruss2_ethtype=3

Example, for nfs boot:

setenv netargs 'setenv bootargs console=${console} ${optargs} \
                root=/dev/nfs nfsroot=${serverip}:${rootpath},\
                ${nfsopts} rw ip=:::::eth0:dhcp:: \
                ti_prueth.pruss1_ethtype=3 \
                ti_prueth.pruss2_ethtype=3'

Future patch will add support of changing to/from switch
firmware type during runtime.

Signed-off-by: WingMan Kwok <w-kwok2@ti.com>