sh: Add kfr2r09 specific memory pre/post sleep code

Add self-refresh handling code for the KFR2R09 board.

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

3 files changed, 66 insertions, 1 deletions

diff --git a/arch/sh/boards/mach-kfr2r09/Makefile b/arch/sh/boards/mach-kfr2r09/Makefile
index 5d5867826e3b..4e577a3bf658 100644
--- a/arch/sh/boards/mach-kfr2r09/Makefile
+++ b/arch/sh/boards/mach-kfr2r09/Makefile
@@ -1,2 +1,2 @@
-obj-y    := setup.o
+obj-y    := setup.o sdram.o
 obj-$(CONFIG_FB_SH_MOBILE_LCDC) +=  lcd_wqvga.o
diff --git a/arch/sh/boards/mach-kfr2r09/sdram.S b/arch/sh/boards/mach-kfr2r09/sdram.S
new file mode 100644
index 000000000000..4ce78fcf5674
--- /dev/null
+++ b/arch/sh/boards/mach-kfr2r09/sdram.S
@@ -0,0 +1,52 @@
+/*
+ * KFR2R09 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(kfr2r09_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(kfr2r09_sdram_enter_end)
+
+        .balign 4
+ENTRY(kfr2r09_sdram_leave_start)
+
+        /* 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
+
+ENTRY(kfr2r09_sdram_leave_end)
diff --git a/arch/sh/boards/mach-kfr2r09/setup.c b/arch/sh/boards/mach-kfr2r09/setup.c
index 43d75ee93358..5dae632092f2 100644
--- a/arch/sh/boards/mach-kfr2r09/setup.c
+++ b/arch/sh/boards/mach-kfr2r09/setup.c
@@ -21,6 +21,7 @@
 #include <media/soc_camera.h>
 #include <media/sh_mobile_ceu.h>
 #include <video/sh_mobile_lcdc.h>
+#include <asm/suspend.h>
 #include <asm/clock.h>
 #include <asm/machvec.h>
 #include <asm/io.h>
@@ -444,8 +445,20 @@ static int kfr2r09_usb0_gadget_setup(void)
         return 0;
 }
 
+extern char kfr2r09_sdram_enter_start;
+extern char kfr2r09_sdram_enter_end;
+extern char kfr2r09_sdram_leave_start;
+extern char kfr2r09_sdram_leave_end;
+
 static int __init kfr2r09_devices_setup(void)
 {
+        /* register board specific self-refresh code */
+        sh_mobile_register_self_refresh(SUSP_SH_STANDBY | SUSP_SH_SF,
+                                        &kfr2r09_sdram_enter_start,
+                                        &kfr2r09_sdram_enter_end,
+                                        &kfr2r09_sdram_leave_start,
+                                        &kfr2r09_sdram_leave_end);
+
         /* enable SCIF1 serial port for YC401 console support */
         gpio_request(GPIO_FN_SCIF1_RXD, NULL);
         gpio_request(GPIO_FN_SCIF1_TXD, NULL);