soc/mediatek: Move mt8192 ufs driver to common

Signed-off-by: Yidi Lin <yidi.lin@mediatek.com>
Change-Id: I28eb13edcded95a9a4c17bdf92da9f792883a613
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52534
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

2 files changed, 26 insertions, 0 deletions

diff --git a/src/soc/mediatek/common/include/soc/ufs.h b/src/soc/mediatek/common/include/soc/ufs.h
new file mode 100644
index 0000000000..98bba9da1c
--- /dev/null
+++ b/src/soc/mediatek/common/include/soc/ufs.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef SOC_MEDIATEK_COMMON_UFS_H
+#define SOC_MEDIATEK_COMMON_UFS_H
+
+#include <device/mmio.h>
+#include <soc/addressmap.h>
+
+void ufs_disable_refclk(void);
+
+enum ufshci_offset {
+	REG_UFS_REFCLK_CTRL = 0x144,
+};
+
+#define UFS_REFCLK_CTRL	(UFSHCI_BASE + REG_UFS_REFCLK_CTRL)
+
+#endif /* SOC_MEDIATEK_COMMON_UFS_H */
diff --git a/src/soc/mediatek/common/ufs.c b/src/soc/mediatek/common/ufs.c
new file mode 100644
index 0000000000..2537fa7883
--- /dev/null
+++ b/src/soc/mediatek/common/ufs.c
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <soc/ufs.h>
+
+void ufs_disable_refclk(void)
+{
+	/* disable ref clock to let UFSHCI release SPM signal */
+	write32((void *)UFS_REFCLK_CTRL, 0);
+}