soc/mediatek/mt8195: Enable SCP SRAM

Enable SCP SRAM to allow module in SCPSYS to access DRAM.

TEST=AFE acess DRAM successfully

Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Change-Id: I40862f8d74e5aa17361f1c91ea31a10b0a4ffb31
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54014
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/src/soc/mediatek/mt8195/scp.c b/src/soc/mediatek/mt8195/scp.c
new file mode 100644
index 0000000000..3a3bc27b1c
--- /dev/null
+++ b/src/soc/mediatek/mt8195/scp.c
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <device/mmio.h>
+#include <soc/scp.h>
+
+void scp_rsi_enable(void)
+{
+	u32 val;
+
+	for (val = SCP_SRAM_PDN_DISABLE_VAL; val != 0U;) {
+		val = val >> 1;
+		write32(REG_L1TCM_SRAM_PDN, val);
+	}
+}
+
+void scp_rsi_disable(void)
+{
+	write32(REG_L1TCM_SRAM_PDN, SCP_SRAM_PDN_DISABLE_VAL);
+}