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i.MX27: add suspend to RAM support

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Signed-off-by: Eric Bénard <eric@eukrea.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Eric Bénard 2010-06-01 21:57:44 +02:00 committed by Sascha Hauer
parent e8c74860a7
commit f42ae0e9f4
2 changed files with 47 additions and 1 deletions
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2
arch/arm/mach-mx2/Makefile
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@ -8,7 +8,7 @@ obj-y := devices.o serial.o
obj-$(CONFIG_MACH_MX21) += clock_imx21.o mm-imx21.o
obj-$(CONFIG_MACH_MX27) += cpu_imx27.o
obj-$(CONFIG_MACH_MX27) += cpu_imx27.o pm-imx27.o
obj-$(CONFIG_MACH_MX27) += clock_imx27.o mm-imx27.o
obj-$(CONFIG_MACH_MX21ADS) += mach-mx21ads.o

46
arch/arm/mach-mx2/pm-imx27.c Normal file
View file

@ -0,0 +1,46 @@
/*
* i.MX27 Power Management Routines
*
* Based on Freescale's BSP
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License.
*/
#include <linux/kernel.h>
#include <linux/suspend.h>
#include <linux/io.h>
#include <mach/system.h>
#include <mach/mx27.h>
static int mx27_suspend_enter(suspend_state_t state)
{
u32 cscr;
switch (state) {
case PM_SUSPEND_MEM:
/* Clear MPEN and SPEN to disable MPLL/SPLL */
cscr = __raw_readl(MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
cscr &= 0xFFFFFFFC;
__raw_writel(cscr, MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
/* Executes WFI */
arch_idle();
break;
default:
return -EINVAL;
}
return 0;
}
static struct platform_suspend_ops mx27_suspend_ops = {
.enter = mx27_suspend_enter,
.valid = suspend_valid_only_mem,
};
static int __init mx27_pm_init(void)
{
suspend_set_ops(&mx27_suspend_ops);
return 0;
}
device_initcall(mx27_pm_init);