[PATCH v5 2/3] arm: gpmc: Low power transition support

Pekon Gupta pekon at ti.com
Mon Jun 17 14:46:38 EDT 2013


From: avinash philip <avinashphilip at ti.com>

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 at ti.com>
Signed-off-by: Pekon Gupta <pekon at ti.com>
---
 arch/arm/mach-omap2/gpmc.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index 1380cee..9b579d0 100644
--- a/arch/arm/mach-omap2/gpmc.c
+++ b/arch/arm/mach-omap2/gpmc.c
@@ -1655,6 +1655,24 @@ 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,
@@ -1662,6 +1680,7 @@ 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,
 	},
 };
 
@@ -1724,7 +1743,6 @@ 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)
@@ -1789,4 +1807,3 @@ void omap3_gpmc_restore_context(void)
 		}
 	}
 }
-#endif /* CONFIG_ARCH_OMAP3 */
-- 
1.8.1




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