linux-phytec-ti

net: netcp: add packet accelerator core driver

This patch adds packet accelerator core driver functions.
Packet Accelerator(PA) is a netcp hw accelerator for functions
such as IP/UDP/TCP checksum in the egress and ingress path.
It also has various Look Up Tables (LUT) that allows to add
packet match and forward rules for various applications.
PA driver is written as a netcp module. So all of the core
netcp module functions such as open()/attach()/close etc
are factored into a core module to help implement the PA
driver.

There are two versions of PA hardware. PA for K2HK SoC and
PA2 for K2L/E SoCs. So two separate PA modules are required
to support these two hardwares which have different architectures
and register sets. The core module is common across these two.
This core module also implement common functions required for
the driver which are available through pa_core_ops. The hardware
capabilities are registered by the hw modules (PA and PA2) during
init time as callbacks through hw structs which are used by the
core driver to pass control to the hw module.

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Jack Manbeck <j-manbeck2@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>