Add support for loading SPM firmware from CBFS to SPM SRAM. SPM needs
its own firmware to enable SPM suspend/resume function which turns off
several resources such as DRAM/mainpll/26M clk when linux system
suspend.
SPM is an essential component on MediaTek SoC, so we initialize PPM
in soc_init(). For MT8188, SPM will handshake with DPM to do
initialization, so we need to call spm_init() after dpm_init().
This SPM flow adds 33ms to the boot time.
firmware log:
mtk_init_mcu: Loaded (and reset) spm_firmware.bin in 25 msecs
SPM: spm_init done in 33 msecs, spm pc = 0x400
TEST=spm pc is 0x400 which is in idle state.
BUG=b:236331724
Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
Change-Id: I1a1f49383e0ceadc259a18272fc1c277b65406ae
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66973
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
c23235e7dd