Using debugfs, export a configurable wakeup timer to be used to
wakeup system from suspend.
If a non-zero value is written to
/debug/pm_debug/wakeup_timer_seconds, A timer wakeup event will wake
the system and resume after the configured number of seconds.
Signed-off-by: Kevin Hilman <khilman@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/mach-omap2/pm-debug.c | 2 ++
arch/arm/mach-omap2/pm.h | 3 +++
arch/arm/mach-omap2/pm34xx.c | 21 +++++++++++++++++++++
arch/arm/mach-omap2/timer-gp.c | 2 ++
4 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/pm-debug.c b/arch/arm/mach-omap2/pm-debug.c
index 4e05d29..b45d79d 100644
--- a/arch/arm/mach-omap2/pm-debug.c
+++ b/arch/arm/mach-omap2/pm-debug.c
@@ -596,6 +596,8 @@ static int __init pm_dbg_init(void)
&enable_off_mode, &pm_dbg_option_fops);
(void) debugfs_create_file("sleep_while_idle", S_IRUGO | S_IWUGO, d,
&sleep_while_idle, &pm_dbg_option_fops);
+ (void) debugfs_create_file("wakeup_timer_seconds", S_IRUGO | S_IWUGO, d,
+ &wakeup_timer_seconds, &pm_dbg_option_fops);
pm_dbg_init_done = 1;
return 0;
diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h
index e47508c..c163b77 100644
--- a/arch/arm/mach-omap2/pm.h
+++ b/arch/arm/mach-omap2/pm.h
@@ -22,6 +22,9 @@ extern void omap3_pm_off_mode_enable(int);
extern int omap3_pm_get_suspend_state(struct powerdomain *pwrdm);
extern int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state);
+extern u32 wakeup_timer_seconds;
+extern struct omap_dm_timer *gptimer_wakeup;
+
#ifdef CONFIG_PM_DEBUG
extern void omap2_pm_dump(int mode, int resume, unsigned int us);
extern int omap2_pm_debug;
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index 99996fc..209672f 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -37,6 +37,7 @@
#include <mach/dma.h>
#include <mach/gpmc.h>
#include <mach/dma.h>
+#include <mach/dmtimer.h>
#include <asm/tlbflush.h>
@@ -61,6 +62,7 @@
u32 enable_off_mode;
u32 sleep_while_idle;
+u32 wakeup_timer_seconds;
struct power_state {
struct powerdomain *pwrdm;
@@ -536,6 +538,22 @@ out:
#ifdef CONFIG_SUSPEND
static suspend_state_t suspend_state;
+static void omap2_pm_wakeup_on_timer(u32 seconds)
+{
+ u32 tick_rate, cycles;
+
+ if (!seconds)
+ return;
+
+ tick_rate = clk_get_rate(omap_dm_timer_get_fclk(gptimer_wakeup));
+ cycles = tick_rate * seconds;
+ omap_dm_timer_stop(gptimer_wakeup);
+ omap_dm_timer_set_load_start(gptimer_wakeup, 0, 0xffffffff - cycles);
+
+ pr_info("PM: Resume timer in %d secs (%d ticks at %d ticks/sec.)\n",
+ seconds, cycles, tick_rate);
+}
+
static int omap3_pm_prepare(void)
{
disable_hlt();
@@ -547,6 +565,9 @@ static int omap3_pm_suspend(void)
struct power_state *pwrst;
int state, ret = 0;
+ if (wakeup_timer_seconds)
+ omap2_pm_wakeup_on_timer(wakeup_timer_seconds);
+
/* Read current next_pwrsts */
list_for_each_entry(pwrst, &pwrst_list, node)
pwrst->saved_state = pwrdm_read_next_pwrst(pwrst->pwrdm);
diff --git a/arch/arm/mach-omap2/timer-gp.c b/arch/arm/mach-omap2/timer-gp.c
index 95a2176..9c056ff 100644
--- a/arch/arm/mach-omap2/timer-gp.c
+++ b/arch/arm/mach-omap2/timer-gp.c
@@ -47,6 +47,7 @@ static struct omap_dm_timer *gptimer;
static struct clock_event_device clockevent_gpt;
static u8 __initdata gptimer_id = 1;
static u8 __initdata inited;
+struct omap_dm_timer *gptimer_wakeup;
static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id)
{
@@ -134,6 +135,7 @@ static void __init omap2_gp_clockevent_init(void)
gptimer = omap_dm_timer_request_specific(gptimer_id);
BUG_ON(gptimer == NULL);
+ gptimer_wakeup = gptimer;
#if defined(CONFIG_OMAP_32K_TIMER)
src = OMAP_TIMER_SRC_32_KHZ;
--
1.6.4.3
--
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