sh: Add ap325rxa specific memory pre/post sleep code

Add self-refresh handling code for the AP325RXA board.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 69 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 000000000000..db24fbed4fca
--- /dev/null
+++ b/arch/sh/boards/mach-ap325rxa/sdram.S
@@ -0,0 +1,69 @@
+/*
+ * AP325RXA 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(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)