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ARM: ux500: Enable system suspend with WFI support

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When building for CONFIG_SUSPEND, add the platform suspend callbacks
to enable system suspend for ux500.

At this initial step, only WFI state is supported, which is reached
for both PM_SUSPEND_MEM and PM_SUSPEND_STANDBY.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Ulf Hansson 2013-12-18 15:59:37 +01:00 committed by Linus Walleij
parent 8ffc05f153
commit ead9e2936b
1 changed files with 27 additions and 0 deletions
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27
arch/arm/mach-ux500/pm.c
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@ -3,6 +3,8 @@
* Author: Rickard Andersson <rickard.andersson@stericsson.com> for * Author: Rickard Andersson <rickard.andersson@stericsson.com> for
* ST-Ericsson. * ST-Ericsson.
* Author: Daniel Lezcano <daniel.lezcano@linaro.org> for Linaro. * Author: Daniel Lezcano <daniel.lezcano@linaro.org> for Linaro.
* Author: Ulf Hansson <ulf.hansson@linaro.org> for Linaro.
*
* License terms: GNU General Public License (GPL) version 2 * License terms: GNU General Public License (GPL) version 2
* *
*/ */
@ -11,6 +13,7 @@
#include <linux/irqchip/arm-gic.h> #include <linux/irqchip/arm-gic.h>
#include <linux/delay.h> #include <linux/delay.h>
#include <linux/io.h> #include <linux/io.h>
#include <linux/suspend.h>
#include <linux/platform_data/arm-ux500-pm.h> #include <linux/platform_data/arm-ux500-pm.h>
#include "db8500-regs.h" #include "db8500-regs.h"
@ -152,6 +155,27 @@ int prcmu_copy_gic_settings(void)
return 0; return 0;
} }
#ifdef CONFIG_SUSPEND
static int ux500_suspend_enter(suspend_state_t state)
{
cpu_do_idle();
return 0;
}
static int ux500_suspend_valid(suspend_state_t state)
{
return state == PM_SUSPEND_MEM || state == PM_SUSPEND_STANDBY;
}
static const struct platform_suspend_ops ux500_suspend_ops = {
.enter = ux500_suspend_enter,
.valid = ux500_suspend_valid,
};
#define UX500_SUSPEND_OPS (&ux500_suspend_ops)
#else
#define UX500_SUSPEND_OPS NULL
#endif
void __init ux500_pm_init(u32 phy_base, u32 size) void __init ux500_pm_init(u32 phy_base, u32 size)
{ {
prcmu_base = ioremap(phy_base, size); prcmu_base = ioremap(phy_base, size);
@ -164,4 +188,7 @@ void __init ux500_pm_init(u32 phy_base, u32 size)
* This will make sure that the GIC is correctly configured. * This will make sure that the GIC is correctly configured.
*/ */
prcmu_gic_recouple(); prcmu_gic_recouple();
/* Set up ux500 suspend callbacks. */
suspend_set_ops(UX500_SUSPEND_OPS);
} }