GCC complains for quite some versions, when compiling the M0 firmware
for Rockchip's rk3399 platform, about an invalid type of function 'main':

  warning: return type of 'main' is not 'int' [-Wmain]

This patch addresses this, by renaming the function to 'm0_main'.

Signed-off-by: Christoph Müllner <christophm30@gmail.com>
Change-Id: I10887f2bda6bdb48c5017044c264139004f7c785

All the m0 code run in SRAM before, but we need to watch PMU_POWER_ST
when SOC enter into FSM, and SRAM will shutdown during this time, so
this code need run in PMUSRAM. But PMUSRAM only 8K space, we can not
put all the m0 binary into PMUSRAM, Split the M0 binary into two, dram
part still run in SRAM, and suspend part run in PMUSRAM.

Change-Id: Ie08bdf3e2b8838f12b9297fe60ab0aad219684b1
Signed-off-by: Lin Huang <hl@rock-chips.com>

To make software license auditing simpler, use SPDX[0] license
identifiers instead of duplicating the license text in every file.

NOTE: Files that have been imported by FreeBSD have not been modified.

[0]: https://spdx.org/

Change-Id: I80a00e1f641b8cc075ca5a95b10607ed9ed8761a
Signed-off-by: dp-arm <dimitris.papastamos@arm.com>

So far, there are more and more features are supported on the RK3399,
meanwhile, these features are increasingly being defined and intertwined.
It's time to clean up and make them clearer.

Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>

We used dcf do ddr frequency scaling, but we just include a dcf
binary, it hard to maintain later, we have M0 compile flow in ATF,
and M0 can also work for ddr frequency scaling, so let's use it.

Signed-off-by: Lin Huang <hl@rock-chips.com>
Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>