Commit d7814e4d authored by Kevin Hilman's avatar Kevin Hilman
Browse files

PM debug: allow configurable wakeup from suspend on OMAP GPtimer 



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: default avatarKevin Hilman <khilman@deeprootsystems.com>
parent c40552bc

arch/arm/mach-omap2/pm-debug.c

+2 −0
Original line number Diff line number Diff line
@@ -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;

arch/arm/mach-omap2/pm.h

+3 −0
Original line number Diff line number Diff line
@@ -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;

arch/arm/mach-omap2/pm34xx.c

+21 −0
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ 
#include <plat/prcm.h>

#include <plat/gpmc.h>

#include <plat/dma.h>

#include <plat/dmtimer.h>



#include <asm/tlbflush.h>
@@ -60,6 +61,7 @@ 


u32 enable_off_mode;

u32 sleep_while_idle;

u32 wakeup_timer_seconds;



struct power_state {

	struct powerdomain *pwrdm;
@@ -535,6 +537,22 @@ 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();
@@ -546,6 +564,9 @@ 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);

arch/arm/mach-omap2/timer-gp.c

+2 −0
Original line number Diff line number Diff line
@@ -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;

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