soc/mediatek/mt8192: devapc: Add ADSP domain setting

Configure ADSP domain from 0 to 4 and lock it to prevent
changing it unexpectedly.

TEST=emerge-asurada coreboot
BRANCH=asurada

Change-Id: Ib938ba05e8d0342572c57366c97ebb0185da8aba
Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52728
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/mediatek/mt8192/devapc.c

@@ -71,9 +71,10 @@ static void fmem_master_init(uintptr_t base)
 static void scp_master_init(uintptr_t base)
 {
 	write32(getreg(base, SCP_DOM), MAS_DOMAIN_3);
+	write32(getreg(base, ADSP_DOM), MAS_DOMAIN_4);
 
-	/* Let SCP_DOM register be read-only for security */
-	write32(getreg(base, ONETIME_LOCK), 0x1);
+	/* Let SCP_DOM and ADSP_DOM registers be read-only for security */
+	write32(getreg(base, ONETIME_LOCK), 0x5);
 }
 
 struct devapc_init {

src/soc/mediatek/mt8192/include/soc/devapc.h

@@ -23,6 +23,7 @@ enum devapc_ao_offset {
 
 enum scp_offset {
 	SCP_DOM = 0xA5080,
+	ADSP_DOM = 0xA5088,
 	ONETIME_LOCK = 0xA5104,
 };