Ashwin Bihari <[email protected]> writes: > I need to implement a timer as a wake up trigger while my custom board > is in the suspended state. I read in the TRM that all of the GPTIMERs > have the capability of generating a wake up interrupt. I'm using the > 2.6.28-rc8 PM Kernel which contains the patch to enable all the > GPTIMERS as wake up sources.
Try the patch below on the current PM branch. I use this for debugging PM code when no other wakeup sources (keypad, UART, etc. are working.) Kevin >From bf81b7cce8967a425f1aa3d73782c1eb0367ce1a Mon Sep 17 00:00:00 2001 From: Kevin Hilman <[email protected]> Date: Fri, 24 Apr 2009 16:13:47 -0700 Subject: [PATCH] OMAP3: PM: Add feature to wake from suspend on timer If a non-zero value is written to /sys/power/wakeup_timer_seconds, A timer wakeup event will wake the system and resume after the configured number of seconds. Signed-off-by: Kevin Hilman <[email protected]> --- arch/arm/mach-omap2/pm.c | 15 +++++++++++++-- arch/arm/mach-omap2/pm.h | 3 +++ arch/arm/mach-omap2/pm34xx.c | 22 ++++++++++++++++++++++ arch/arm/mach-omap2/timer-gp.c | 2 ++ 4 files changed, 40 insertions(+), 2 deletions(-) diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c index 50d95cd..dde0af3 100644 --- a/arch/arm/mach-omap2/pm.c +++ b/arch/arm/mach-omap2/pm.c @@ -42,6 +42,7 @@ unsigned short enable_dyn_sleep; unsigned short clocks_off_while_idle; unsigned short enable_off_mode; unsigned short voltage_off_while_idle; +unsigned short wakeup_timer_seconds; atomic_t sleep_block = ATOMIC_INIT(0); static ssize_t idle_show(struct kobject *, struct kobj_attribute *, char *); @@ -76,6 +77,9 @@ static struct kobj_attribute vdd2_lock_attr = #endif +static struct kobj_attribute wakeup_timer_seconds_attr = + __ATTR(wakeup_timer_seconds, 0644, idle_show, idle_store); + static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { @@ -87,6 +91,8 @@ static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr, return sprintf(buf, "%hu\n", enable_off_mode); else if (attr == &voltage_off_while_idle_attr) return sprintf(buf, "%hu\n", voltage_off_while_idle); + else if (attr == &wakeup_timer_seconds_attr) + return sprintf(buf, "%hu\n", wakeup_timer_seconds); else return -EINVAL; } @@ -96,8 +102,7 @@ static ssize_t idle_store(struct kobject *kobj, struct kobj_attribute *attr, { unsigned short value; - if (sscanf(buf, "%hu", &value) != 1 || - (value != 0 && value != 1)) { + if (sscanf(buf, "%hu", &value) != 1) { printk(KERN_ERR "idle_store: Invalid value\n"); return -EINVAL; } @@ -109,6 +114,8 @@ static ssize_t idle_store(struct kobject *kobj, struct kobj_attribute *attr, } else if (attr == &enable_off_mode_attr) { enable_off_mode = value; omap3_pm_off_mode_enable(enable_off_mode); + } else if (attr == &wakeup_timer_seconds_attr) { + wakeup_timer_seconds = value; } else if (attr == &voltage_off_while_idle_attr) { voltage_off_while_idle = value; if (voltage_off_while_idle) @@ -255,6 +262,10 @@ static int __init omap_pm_init(void) printk(KERN_ERR "sysfs_create_file failed: %d\n", error); return error; } + error = sysfs_create_file(power_kobj, + &wakeup_timer_seconds_attr.attr); + if (error) + printk(KERN_ERR "sysfs_create_file failed: %d\n", error); #ifdef CONFIG_OMAP_PM_SRF error = sysfs_create_file(power_kobj, &vdd1_opp_attr.attr); diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h index 942a990..66effed 100644 --- a/arch/arm/mach-omap2/pm.h +++ b/arch/arm/mach-omap2/pm.h @@ -30,6 +30,9 @@ extern unsigned short voltage_off_while_idle; extern atomic_t sleep_block; extern void *omap3_secure_ram_storage; +extern unsigned short wakeup_timer_seconds; +extern struct omap_dm_timer *gptimer_wakeup; + extern void omap2_block_sleep(void); extern void omap2_allow_sleep(void); #ifdef CONFIG_ARCH_OMAP3 diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c index d8795b5..3f41417 100644 --- a/arch/arm/mach-omap2/pm34xx.c +++ b/arch/arm/mach-omap2/pm34xx.c @@ -26,6 +26,7 @@ #include <linux/module.h> #include <linux/list.h> #include <linux/err.h> +#include <linux/clk.h> #include <mach/gpio.h> #include <mach/sram.h> @@ -41,6 +42,8 @@ #include <mach/dma.h> #include <mach/gpmc.h> #include <mach/dma.h> +#include <mach/dmtimer.h> + #include <asm/tlbflush.h> #include "cm.h" @@ -552,6 +555,22 @@ out: static void (*saved_idle)(void); 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) { saved_idle = pm_idle; @@ -564,6 +583,9 @@ 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 8351a34..83dd4b1 100644 --- a/arch/arm/mach-omap2/timer-gp.c +++ b/arch/arm/mach-omap2/timer-gp.c @@ -38,6 +38,7 @@ static struct omap_dm_timer *gptimer; static struct clock_event_device clockevent_gpt; +struct omap_dm_timer *gptimer_wakeup; static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id) { @@ -101,6 +102,7 @@ static void __init omap2_gp_clockevent_init(void) gptimer = omap_dm_timer_request_specific(CONFIG_OMAP_TICK_GPTIMER); BUG_ON(gptimer == NULL); + gptimer_wakeup = gptimer; #if defined(CONFIG_OMAP_32K_TIMER) omap_dm_timer_set_source(gptimer, OMAP_TIMER_SRC_32_KHZ); -- 1.6.2.2 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
