Beispiel #1
0
static int s3c2410_pm_enter(suspend_state_t state)
{
	unsigned long regs_save[16];
	unsigned long tmp;

	/* ensure the debug is initialised (if enabled) */

	s3c2410_pm_debug_init();

	DBG("s3c2410_pm_enter(%d)\n", state);

	if (state != PM_SUSPEND_MEM) {
		printk(KERN_ERR PFX "error: only PM_SUSPEND_MEM supported\n");
		return -EINVAL;
	}

	/* check if we have anything to wake-up with... bad things seem
	 * to happen if you suspend with no wakeup (system will often
	 * require a full power-cycle)
	*/

	if (!any_allowed(s3c_irqwake_intmask, s3c_irqwake_intallow) &&
	    !any_allowed(s3c_irqwake_eintmask, s3c_irqwake_eintallow)) {
		printk(KERN_ERR PFX "No sources enabled for wake-up!\n");
		printk(KERN_ERR PFX "Aborting sleep\n");
		return -EINVAL;
	}

	/* prepare check area if configured */

	s3c2410_pm_check_prepare();

	/* store the physical address of the register recovery block */

	s3c2410_sleep_save_phys = virt_to_phys(regs_save);

	DBG("s3c2410_sleep_save_phys=0x%08lx\n", s3c2410_sleep_save_phys);

	/* ensure at least GESTATUS3 has the resume address */

	__raw_writel(virt_to_phys(s3c2410_cpu_resume), S3C2410_GSTATUS3);

	DBG("GSTATUS3 0x%08x\n", __raw_readl(S3C2410_GSTATUS3));
	DBG("GSTATUS4 0x%08x\n", __raw_readl(S3C2410_GSTATUS4));

	/* save all necessary core registers not covered by the drivers */

	s3c2410_pm_do_save(gpio_save, ARRAY_SIZE(gpio_save));
	s3c2410_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
	s3c2410_pm_do_save(core_save, ARRAY_SIZE(core_save));
	s3c2410_pm_do_save(uart_save, ARRAY_SIZE(uart_save));

	/* set the irq configuration for wake */

	s3c2410_pm_configure_extint();

	DBG("sleep: irq wakeup masks: %08lx,%08lx\n",
	    s3c_irqwake_intmask, s3c_irqwake_eintmask);

	__raw_writel(s3c_irqwake_intmask, S3C2410_INTMSK);
	__raw_writel(s3c_irqwake_eintmask, S3C2410_EINTMASK);

	/* ack any outstanding external interrupts before we go to sleep */

	__raw_writel(__raw_readl(S3C2410_EINTPEND), S3C2410_EINTPEND);

	/* flush cache back to ram */

	arm920_flush_kern_cache_all();

	s3c2410_pm_check_store();

	// need to make some form of time-delta

	/* send the cpu to sleep... */

	__raw_writel(0x00, S3C2410_CLKCON);  /* turn off clocks over sleep */

	s3c2410_cpu_suspend(regs_save);

	/* unset the return-from-sleep flag, to ensure reset */

	tmp = __raw_readl(S3C2410_GSTATUS2);
	tmp &= S3C2410_GSTATUS2_OFFRESET;
	__raw_writel(tmp, S3C2410_GSTATUS2);

	/* restore the system state */

	s3c2410_pm_do_restore_core(core_save, ARRAY_SIZE(core_save));
	s3c2410_pm_do_restore(gpio_save, ARRAY_SIZE(gpio_save));
	s3c2410_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
	s3c2410_pm_do_restore(uart_save, ARRAY_SIZE(uart_save));

	s3c2410_pm_debug_init();

	/* check what irq (if any) restored the system */

	DBG("post sleep: IRQs 0x%08x, 0x%08x\n",
	    __raw_readl(S3C2410_SRCPND),
	    __raw_readl(S3C2410_EINTPEND));

	s3c2410_pm_show_resume_irqs(IRQ_EINT0, __raw_readl(S3C2410_SRCPND),
				    s3c_irqwake_intmask);

	s3c2410_pm_show_resume_irqs(IRQ_EINT4-4, __raw_readl(S3C2410_EINTPEND),
				    s3c_irqwake_eintmask);

	DBG("post sleep, preparing to return\n");

	s3c2410_pm_check_restore();

	/* ok, let's return from sleep */

	DBG("S3C2410 PM Resume (post-restore)\n");
	return 0;
}
Beispiel #2
0
static int s3c2410_pm_enter(suspend_state_t state)
{
	unsigned long regs_save[16];

	/* ensure the debug is initialised (if enabled) */

	s3c2410_pm_debug_init();

	DBG("s3c2410_pm_enter(%d)\n", state);

	if (pm_cpu_prep == NULL || pm_cpu_sleep == NULL) {
		printk(KERN_ERR PFX "error: no cpu sleep functions set\n");
		return -EINVAL;
	}

	/* check if we have anything to wake-up with... bad things seem
	 * to happen if you suspend with no wakeup (system will often
	 * require a full power-cycle)
	*/

	if (!any_allowed(s3c_irqwake_intmask, s3c_irqwake_intallow) &&
	    !any_allowed(s3c_irqwake_eintmask, s3c_irqwake_eintallow)) {
		printk(KERN_ERR PFX "No sources enabled for wake-up!\n");
		printk(KERN_ERR PFX "Aborting sleep\n");
		return -EINVAL;
	}

	/* prepare check area if configured */

	s3c2410_pm_check_prepare();

	/* store the physical address of the register recovery block */

	s3c2410_sleep_save_phys = virt_to_phys(regs_save);

	DBG("s3c2410_sleep_save_phys=0x%08lx\n", s3c2410_sleep_save_phys);

	/* save all necessary core registers not covered by the drivers */

	s3c2410_pm_do_save(gpio_save, ARRAY_SIZE(gpio_save));
	s3c2410_pm_do_save(core_save, ARRAY_SIZE(core_save));
	s3c2410_pm_do_save(uart_save, ARRAY_SIZE(uart_save));

	/* set the irq configuration for wake */

	s3c2410_pm_configure_extint();

	DBG("sleep: irq wakeup masks: %08lx,%08lx\n",
	    s3c_irqwake_intmask, s3c_irqwake_eintmask);

	__raw_writel(s3c_irqwake_intmask, S3C2410_INTMSK);
	__raw_writel(s3c_irqwake_eintmask, S3C2410_EINTMASK);

	/* ack any outstanding external interrupts before we go to sleep */

	__raw_writel(__raw_readl(S3C2410_EINTPEND), S3C2410_EINTPEND);
	__raw_writel(__raw_readl(S3C2410_INTPND), S3C2410_INTPND);
	__raw_writel(__raw_readl(S3C2410_SRCPND), S3C2410_SRCPND);

	/* call cpu specific preparation */

	pm_cpu_prep();

	/* flush cache back to ram */

	flush_cache_all();

	s3c2410_pm_check_store();

	/* send the cpu to sleep... */

	__raw_writel(0x00, S3C2410_CLKCON);  /* turn off clocks over sleep */

	/* s3c2410_cpu_save will also act as our return point from when
	 * we resume as it saves its own register state, so use the return
	 * code to differentiate return from save and return from sleep */

	if (s3c2410_cpu_save(regs_save) == 0) {
		flush_cache_all();
		pm_cpu_sleep();
	}

	/* restore the cpu state */

	cpu_init();

	/* restore the system state */

	s3c2410_pm_do_restore_core(core_save, ARRAY_SIZE(core_save));
	s3c2410_pm_do_restore(gpio_save, ARRAY_SIZE(gpio_save));
	s3c2410_pm_do_restore(uart_save, ARRAY_SIZE(uart_save));

	s3c2410_pm_debug_init();

	/* check what irq (if any) restored the system */

	DBG("post sleep: IRQs 0x%08x, 0x%08x\n",
	    __raw_readl(S3C2410_SRCPND),
	    __raw_readl(S3C2410_EINTPEND));

	s3c2410_pm_show_resume_irqs(IRQ_EINT0, __raw_readl(S3C2410_SRCPND),
				    s3c_irqwake_intmask);

	s3c2410_pm_show_resume_irqs(IRQ_EINT4-4, __raw_readl(S3C2410_EINTPEND),
				    s3c_irqwake_eintmask);

	DBG("post sleep, preparing to return\n");

	s3c2410_pm_check_restore();

	/* ok, let's return from sleep */

	DBG("S3C2410 PM Resume (post-restore)\n");
	return 0;
}