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: Philip Avinash <avinashphilip@ti.com>
Signed-off-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index bac18b3..1c7969e 100644
--- a/arch/arm/mach-omap2/gpmc.c
+++ b/arch/arm/mach-omap2/gpmc.c
@@ -1669,6 +1669,24 @@
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 @@
.name = DEVICE_NAME,
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(gpmc_dt_ids),
+ .pm = &gpmc_pm_ops,
},
};
@@ -1738,7 +1757,6 @@
return IRQ_HANDLED;
}
-#ifdef CONFIG_ARCH_OMAP3
static struct omap3_gpmc_regs gpmc_context;
void omap3_gpmc_save_context(void)
@@ -1803,4 +1821,3 @@
}
}
}
-#endif /* CONFIG_ARCH_OMAP3 */