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sh: Add migor specific memory pre/post sleep code

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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>
This commit is contained in:
Magnus Damm 2009-10-29 10:52:31 +00:00 committed by Paul Mundt
parent 3b9f2952a3
commit 13fa551b5e
3 changed files with 82 additions and 2 deletions
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2
arch/sh/boards/mach-migor/Makefile
View file

@ -1,2 +1,2 @@
obj-y := setup.o
obj-y := setup.o sdram.o
obj-$(CONFIG_SH_MIGOR_QVGA) += lcd_qvga.o

69
arch/sh/boards/mach-migor/sdram.S Normal file
View file

@ -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)

13
arch/sh/boards/mach-migor/setup.c
View file

@ -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);