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-rw-r--r--arch/sh/boards/mach-ap325rxa/sdram.S66
1 files changed, 66 insertions, 0 deletions
diff --git a/arch/sh/boards/mach-ap325rxa/sdram.S b/arch/sh/boards/mach-ap325rxa/sdram.S
new file mode 100644
index 000000000..541c82cc3
--- /dev/null
+++ b/arch/sh/boards/mach-ap325rxa/sdram.S
@@ -0,0 +1,66 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * AP325RXA sdram self/auto-refresh setup code
+ *
+ * Copyright (C) 2009 Magnus Damm
+ */
+
+#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(ap325rxa_sdram_enter_start)
+
+ /* SBSC: disable power down and put in self-refresh mode */
+ mov.l 1f, r4
+ mov.l 2f, r1
+ mov.l @r4, r2
+ or r1, r2
+ mov.l 3f, r3
+ and r3, r2
+ mov.l r2, @r4
+
+ rts
+ nop
+
+ .balign 4
+1: .long 0xfe400008 /* SDCR0 */
+2: .long 0x00000400
+3: .long 0xffff7fff
+ENTRY(ap325rxa_sdram_enter_end)
+
+ .balign 4
+ENTRY(ap325rxa_sdram_leave_start)
+
+ /* SBSC: set auto-refresh mode */
+ mov.l 1f, r4
+ mov.l @r4, r0
+ mov.l 4f, r1
+ and r1, r0
+ mov.l r0, @r4
+ mov.l 6f, r4
+ mov.l 8f, r0
+ mov.l @r4, r1
+ mov #-1, r4
+ add r4, r1
+ or r1, r0
+ mov.l 7f, r1
+ mov.l r0, @r1
+
+ rts
+ nop
+
+ .balign 4
+1: .long 0xfe400008 /* SDCR0 */
+4: .long 0xfffffbff
+6: .long 0xfe40001c /* RTCOR */
+7: .long 0xfe400018 /* RTCNT */
+8: .long 0xa55a0000
+ENTRY(ap325rxa_sdram_leave_end)