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ARM: OMAP2+: gpmc: Low power transition support

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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: Philip Avinash <avinashphilip@ti.com>
Signed-off-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
avinash philip 2013-06-18 00:16:38 +05:30 committed by Tony Lindgren
parent b3f5525c55
commit b536dd412b
1 changed files with 19 additions and 2 deletions
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21
arch/arm/mach-omap2/gpmc.c
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@ -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 */