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Commit b536dd41 authored by avinash philip's avatar avinash philip Committed by Tony Lindgren
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ARM: OMAP2+: gpmc: Low power transition support 



GPMC is hardware controller for external memory interfaces.
This patch adds suspend/resume support for GPMC driver.
It also preserves GPMC register configurations across device low-power states
in which GPMC hardware can be powered-off.
gpmc_suspend()/gpmc_resume() are called by default by core PM framework as part
of driver's runtime PM callbacks.

Signed-off-by: default avatarPhilip Avinash <avinashphilip@ti.com>
Signed-off-by: default avatarPekon Gupta <pekon@ti.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent b3f5525c

arch/arm/mach-omap2/gpmc.c

+19 −2
Original line number Diff line number Diff line
@@ -1669,6 +1669,24 @@ static int gpmc_remove(struct platform_device *pdev) 
	return 0;

}



#ifdef CONFIG_PM_SLEEP

static int gpmc_suspend(struct device *dev)

{

	omap3_gpmc_save_context();

	pm_runtime_put_sync(dev);

	return 0;

}



static int gpmc_resume(struct device *dev)

{

	pm_runtime_get_sync(dev);

	omap3_gpmc_restore_context();

	return 0;

}

#endif



static SIMPLE_DEV_PM_OPS(gpmc_pm_ops, gpmc_suspend, gpmc_resume);



static struct platform_driver gpmc_driver = {

	.probe		= gpmc_probe,

	.remove		= gpmc_remove,
@@ -1676,6 +1694,7 @@ static struct platform_driver gpmc_driver = { 
		.name	= DEVICE_NAME,

		.owner	= THIS_MODULE,

		.of_match_table = of_match_ptr(gpmc_dt_ids),

		.pm	= &gpmc_pm_ops,

	},

};
@@ -1738,7 +1757,6 @@ static irqreturn_t gpmc_handle_irq(int irq, void *dev) 
	return IRQ_HANDLED;

}



#ifdef CONFIG_ARCH_OMAP3

static struct omap3_gpmc_regs gpmc_context;



void omap3_gpmc_save_context(void)
@@ -1803,4 +1821,3 @@ void omap3_gpmc_restore_context(void) 
		}

	}

}
 
#endif /* CONFIG_ARCH_OMAP3 */