v4.19.13 snapshot.
diff --git a/arch/sh/boards/mach-ecovec24/sdram.S b/arch/sh/boards/mach-ecovec24/sdram.S
new file mode 100644
index 0000000..3963c6f
--- /dev/null
+++ b/arch/sh/boards/mach-ecovec24/sdram.S
@@ -0,0 +1,111 @@
+/*
+ * Ecovec24 sdram self/auto-refresh setup code
+ *
+ * Copyright (C) 2009 Magnus Damm
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/sys.h>
+#include <linux/errno.h>
+#include <linux/linkage.h>
+#include <asm/asm-offsets.h>
+#include <asm/suspend.h>
+#include <asm/romimage-macros.h>
+
+/* code to enter and leave self-refresh. must be self-contained.
+ * this code will be copied to on-chip memory and executed from there.
+ */
+ .balign 4
+ENTRY(ecovec24_sdram_enter_start)
+
+ /* DBSC: put memory in self-refresh mode */
+
+ ED 0xFD000010, 0x00000000 /* DBEN */
+ ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
+ ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
+ ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
+ ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
+
+ rts
+ nop
+
+ENTRY(ecovec24_sdram_enter_end)
+
+ .balign 4
+ENTRY(ecovec24_sdram_leave_start)
+
+ mov.l @(SH_SLEEP_MODE, r5), r0
+ tst #SUSP_SH_RSTANDBY, r0
+ bf resume_rstandby
+
+ /* DBSC: put memory in auto-refresh mode */
+
+ ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
+ WAIT 1
+ ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
+ ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
+ ED 0xFD000010, 0x00000001 /* DBEN */
+ ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
+
+ rts
+ nop
+
+resume_rstandby:
+
+ /* DBSC: re-initialize and put in auto-refresh */
+
+ ED 0xFD000108, 0x00000181 /* DBPDCNT0 */
+ ED 0xFD000020, 0x015B0002 /* DBCONF */
+ ED 0xFD000030, 0x03071502 /* DBTR0 */
+ ED 0xFD000034, 0x02020102 /* DBTR1 */
+ ED 0xFD000038, 0x01090405 /* DBTR2 */
+ ED 0xFD00003C, 0x00000002 /* DBTR3 */
+ ED 0xFD000008, 0x00000005 /* DBKIND */
+ ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
+ ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
+ ED 0xFD000018, 0x00000001 /* DBCKECNT */
+
+ mov #100,r0
+WAIT_400NS:
+ dt r0
+ bf WAIT_400NS
+
+ ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
+ ED 0xFD000060, 0x00020000 /* DBMRCNT (EMR2) */
+ ED 0xFD000060, 0x00030000 /* DBMRCNT (EMR3) */
+ ED 0xFD000060, 0x00010004 /* DBMRCNT (EMR) */
+ ED 0xFD000060, 0x00000532 /* DBMRCNT (MRS) */
+ ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
+ ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
+ ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
+ ED 0xFD000060, 0x00000432 /* DBMRCNT (MRS) */
+ ED 0xFD000060, 0x000103c0 /* DBMRCNT (EMR) */
+ ED 0xFD000060, 0x00010040 /* DBMRCNT (EMR) */
+
+ mov #100,r0
+WAIT_400NS_2:
+ dt r0
+ bf WAIT_400NS_2
+
+ ED 0xFD000010, 0x00000001 /* DBEN */
+ ED 0xFD000044, 0x0000050f /* DBRFPDN1 */
+ ED 0xFD000048, 0x236800e6 /* DBRFPDN2 */
+
+ mov.l DUMMY,r0
+ mov.l @r0, r1 /* force single dummy read */
+
+ ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
+ ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
+ ED 0xFD000108, 0x00000080 /* DBPDCNT0 */
+ ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
+
+ rts
+ nop
+
+ .balign 4
+DUMMY: .long 0xac400000
+
+ENTRY(ecovec24_sdram_leave_end)