[PATCH 1/7] DMA: PL330: Add support runtime PM for PL330 DMAC

[Kukjin Kim]

From: Boojin Kim <boojin....@samsung.com>

Signed-off-by: Boojin Kim <boojin....@samsung.com>
Cc: Vinod Koul <vinod.k...@intel.com>
Cc: Dan Williams <dan.j.willi...@intel.com>
Signed-off-by: Kukjin Kim <kgene....@samsung.com>
---
 drivers/dma/pl330.c |   61 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 61 insertions(+), 0 deletions(-)

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 6abe1ec..7bd72e9 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -17,6 +17,7 @@
 #include <linux/interrupt.h>
 #include <linux/amba/bus.h>
 #include <linux/amba/pl330.h>
+#include <linux/pm_runtime.h>
 
 #define NR_DEFAULT_DESC        16
 
@@ -666,6 +667,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id 
*id)
        struct dma_device *pd;
        struct resource *res;
        int i, ret, irq;
+       struct clk* clk;
 
        pdat = adev->dev.platform_data;
 
@@ -696,6 +698,28 @@ pl330_probe(struct amba_device *adev, const struct amba_id 
*id)
                goto probe_err1;
        }
 
+#ifdef CONFIG_PM_RUNTIME
+       /* to use the runtime PM helper functions */
+       pm_runtime_enable(&adev->dev);
+
+       /* enable the power domain */
+       if (pm_runtime_get_sync(&adev->dev)) {
+               dev_err(&adev->dev, "failed to get runtime pm\n");
+               ret = -ENODEV;
+               goto probe_err1;
+       }
+#else
+       /* enable dma clk */
+       clk = clk_get(&adev->dev, "dma");
+
+       if (IS_ERR(clk)) {
+               dev_err(&adev->dev, "Cannot get operation clock.\n");
+               ret = -EINVAL;
+               goto probe_err1;
+       }
+       clk_enable(clk);
+#endif
+
        irq = adev->irq[0];
        ret = request_irq(irq, pl330_irq_handler, 0,
                        dev_name(&adev->dev), pi);
@@ -838,10 +862,47 @@ static struct amba_id pl330_ids[] = {
        { 0, 0 },
 };
 
+#ifdef CONFIG_PM_RUNTIME
+static int pl330_runtime_suspend(struct device *dev)
+{
+       struct clk *dmaclk = clk_get(dev, "dma");
+
+       if (dmaclk == NULL) {
+               dev_err(dev, "failed to find dma clock source\n");
+               return -ENODEV;
+       }
+
+       clk_disable(dmaclk);
+       return 0;
+}
+
+static int pl330_runtime_resume(struct device *dev)
+{
+       struct clk *dmaclk = clk_get(dev, "dma");
+
+       if (dmaclk == NULL) {
+               dev_err(dev, "failed to find dma clock source\n");
+               return -ENODEV;
+       }
+
+       clk_enable(dmaclk);
+       return 0;
+}
+#else
+#define pl330_runtime_suspend  NULL
+#define pl330_runtime_resume   NULL
+#endif /* CONFIG_PM_RUNTIME */
+
+static const struct dev_pm_ops pl330_pm_ops = {
+       .runtime_suspend = pl330_runtime_suspend,
+       .runtime_resume = pl330_runtime_resume,
+};
+
 static struct amba_driver pl330_driver = {
        .drv = {
                .owner = THIS_MODULE,
                .name = "dma-pl330",
+               .pm = &pl330_pm_ops,
        },
        .id_table = pl330_ids,
        .probe = pl330_probe,
-- 
1.7.1

--
To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html