soc/mediatek: Initialize SSPM

Load SSPM firmware and boot up SSPM in ramstage.
This adds 23ms to the boot time.

TEST=Load SSPM blob ok, and we can see some logs of SSPM from AP.

Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Change-Id: Ia227ea9f7d58129068cb36ec2de7d9feb677006b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55051
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

src/soc/mediatek/mt8195/Kconfig

@@ -25,6 +25,12 @@ config MCUPM_FIRMWARE
 	help
 	  The file name of the MediaTek MCUPM firmware.
 
+config SSPM_FIRMWARE
+	string
+	default "sspm.bin"
+	help
+	  The file name of the MediaTek SSPM firmware.
+
 config FLASH_DUAL_READ
 	bool
 	default y

src/soc/mediatek/mt8195/Makefile.inc

@@ -54,6 +54,7 @@ ramstage-y += ../common/mmu_operations.c mmu_operations.c
 ramstage-y += ../common/mtcmos.c mtcmos.c
 ramstage-$(CONFIG_SPI_FLASH) += ../common/spi.c spi.c
 ramstage-y += soc.c
+ramstage-y += ../common/sspm.c
 ramstage-y += ../common/timer.c timer.c
 ramstage-y += ../common/uart.c
 ramstage-y += ../common/ufs.c
@@ -66,7 +67,8 @@ BL31_MAKEARGS += PLAT=mt8195
 MT8195_BLOB_DIR := 3rdparty/blobs/soc/mediatek/mt8195
 
 mcu-firmware-files := \
-	$(CONFIG_MCUPM_FIRMWARE)
+	$(CONFIG_MCUPM_FIRMWARE) \
+	$(CONFIG_SSPM_FIRMWARE)
 
 $(foreach fw, $(call strip_quotes,$(mcu-firmware-files)), \
 	  $(eval $(fw)-file := $(MT8195_BLOB_DIR)/$(fw)) \

src/soc/mediatek/mt8195/soc.c

@@ -4,6 +4,7 @@
 #include <soc/emi.h>
 #include <soc/mcupm.h>
 #include <soc/mmu_operations.h>
+#include <soc/sspm.h>
 #include <soc/ufs.h>
 #include <symbols.h>
 
@@ -16,6 +17,7 @@ static void soc_init(struct device *dev)
 {
 	mtk_mmu_disable_l2c_sram();
 	mcupm_init();
+	sspm_init();
 	ufs_disable_refclk();
 }