ARM: 8206/1: dmaengine: pl330: Add PM sleep support

Add system suspend/resume capabilities to the pl330 driver so the amba
bus clock could be also unprepared to conserve energy.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 41 insertions, 0 deletions

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 39ea8d436b81..2d324f780719 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -2627,6 +2627,46 @@ static int pl330_dma_device_slave_caps(struct dma_chan *dchan,
         return 0;
 }
 
+/*
+ * Runtime PM callbacks are provided by amba/bus.c driver.
+ *
+ * It is assumed here that IRQ safe runtime PM is chosen in probe and amba
+ * bus driver will only disable/enable the clock in runtime PM callbacks.
+ */
+static int __maybe_unused pl330_suspend(struct device *dev)
+{
+        struct amba_device *pcdev = to_amba_device(dev);
+
+        pm_runtime_disable(dev);
+
+        if (!pm_runtime_status_suspended(dev)) {
+                /* amba did not disable the clock */
+                amba_pclk_disable(pcdev);
+        }
+        amba_pclk_unprepare(pcdev);
+
+        return 0;
+}
+
+static int __maybe_unused pl330_resume(struct device *dev)
+{
+        struct amba_device *pcdev = to_amba_device(dev);
+        int ret;
+
+        ret = amba_pclk_prepare(pcdev);
+        if (ret)
+                return ret;
+
+        if (!pm_runtime_status_suspended(dev))
+                ret = amba_pclk_enable(pcdev);
+
+        pm_runtime_enable(dev);
+
+        return ret;
+}
+
+static SIMPLE_DEV_PM_OPS(pl330_pm, pl330_suspend, pl330_resume);
+
 static int
 pl330_probe(struct amba_device *adev, const struct amba_id *id)
 {
@@ -2852,6 +2892,7 @@ static struct amba_driver pl330_driver = {
         .drv = {
                 .owner = THIS_MODULE,
                 .name = "dma-pl330",
+                .pm = &pl330_pm,
         },
         .id_table = pl330_ids,
         .probe = pl330_probe,