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authorMagnus Damm <damm@opensource.se>2009-10-29 10:52:31 +0000
committerPaul Mundt <lethal@linux-sh.org>2009-10-30 11:59:27 +0900
commit13fa551b5eb1752c6974a81ef19f369220972cf2 (patch)
tree1c5d64664d36dc4784451fabb1da8629026d4067 /arch/sh
parent3b9f2952a3eda738f5f2d7610b76e284cbac581f (diff)
sh: Add migor specific memory pre/post sleep code
Add self-refresh handling code for the Migo-R board. Signed-off-by: Magnus Damm <damm@opensource.se> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh')
-rw-r--r--arch/sh/boards/mach-migor/Makefile2
-rw-r--r--arch/sh/boards/mach-migor/sdram.S69
-rw-r--r--arch/sh/boards/mach-migor/setup.c13
3 files changed, 82 insertions, 2 deletions
diff --git a/arch/sh/boards/mach-migor/Makefile b/arch/sh/boards/mach-migor/Makefile
index 5f231dd25c0..4601a89e5ac 100644
--- a/arch/sh/boards/mach-migor/Makefile
+++ b/arch/sh/boards/mach-migor/Makefile
@@ -1,2 +1,2 @@
-obj-y := setup.o
+obj-y := setup.o sdram.o
obj-$(CONFIG_SH_MIGOR_QVGA) += lcd_qvga.o
diff --git a/arch/sh/boards/mach-migor/sdram.S b/arch/sh/boards/mach-migor/sdram.S
new file mode 100644
index 00000000000..614aa3a1398
--- /dev/null
+++ b/arch/sh/boards/mach-migor/sdram.S
@@ -0,0 +1,69 @@
+/*
+ * Migo-R 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(migor_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(migor_sdram_enter_end)
+
+ .balign 4
+ENTRY(migor_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(migor_sdram_leave_end)
diff --git a/arch/sh/boards/mach-migor/setup.c b/arch/sh/boards/mach-migor/setup.c
index 8e911360c91..369525701d6 100644
--- a/arch/sh/boards/mach-migor/setup.c
+++ b/arch/sh/boards/mach-migor/setup.c
@@ -26,6 +26,7 @@
#include <asm/machvec.h>
#include <asm/io.h>
#include <asm/sh_keysc.h>
+#include <asm/suspend.h>
#include <mach/migor.h>
#include <cpu/sh7722.h>
@@ -478,9 +479,19 @@ static struct platform_device *migor_devices[] __initdata = {
&migor_camera[1],
};
+extern char migor_sdram_enter_start;
+extern char migor_sdram_enter_end;
+extern char migor_sdram_leave_start;
+extern char migor_sdram_leave_end;
+
static int __init migor_devices_setup(void)
{
-
+ /* register board specific self-refresh code */
+ sh_mobile_register_self_refresh(SUSP_SH_STANDBY | SUSP_SH_SF,
+ &migor_sdram_enter_start,
+ &migor_sdram_enter_end,
+ &migor_sdram_leave_start,
+ &migor_sdram_leave_end);
#ifdef CONFIG_PM
/* Let D11 LED show STATUS0 */
gpio_request(GPIO_FN_STATUS0, NULL);