1 files changed, 26 insertions, 12 deletions

diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c
index 4768ef26013b..321748e2983e 100644
--- a/drivers/dma/bcm2835-dma.c
+++ b/drivers/dma/bcm2835-dma.c
@@ -41,14 +41,12 @@
  * struct bcm2835_dmadev - BCM2835 DMA controller
  * @ddev: DMA device
  * @base: base address of register map
- * @dma_parms: DMA parameters (to convey 1 GByte max segment size to clients)
  * @zero_page: bus address of zero page (to detect transactions copying from
  *	zero page and avoid accessing memory if so)
  */
 struct bcm2835_dmadev {
 	struct dma_device ddev;
 	void __iomem *base;
-	struct device_dma_parameters dma_parms;
 	dma_addr_t zero_page;
 };
 
@@ -371,7 +369,7 @@ static struct bcm2835_desc *bcm2835_dma_create_cb_chain(
 	/* the last frame requires extra flags */
 	d->cb_list[d->frames - 1].cb->info |= finalextrainfo;
 
-	/* detect a size missmatch */
+	/* detect a size mismatch */
 	if (buf_len && (d->size != buf_len))
 		goto error_cb;
 
@@ -877,10 +875,30 @@ static struct dma_chan *bcm2835_dma_xlate(struct of_phandle_args *spec,
 	return chan;
 }
 
+static int bcm2835_dma_suspend_late(struct device *dev)
+{
+	struct bcm2835_dmadev *od = dev_get_drvdata(dev);
+	struct bcm2835_chan *c, *next;
+
+	list_for_each_entry_safe(c, next, &od->ddev.channels,
+				 vc.chan.device_node) {
+		void __iomem *chan_base = c->chan_base;
+
+		/* Check if DMA channel is busy */
+		if (readl(chan_base + BCM2835_DMA_ADDR))
+			return -EBUSY;
+	}
+
+	return 0;
+}
+
+static const struct dev_pm_ops bcm2835_dma_pm_ops = {
+	LATE_SYSTEM_SLEEP_PM_OPS(bcm2835_dma_suspend_late, NULL)
+};
+
 static int bcm2835_dma_probe(struct platform_device *pdev)
 {
 	struct bcm2835_dmadev *od;
-	struct resource *res;
 	void __iomem *base;
 	int rc;
 	int i, j;
@@ -902,11 +920,9 @@ static int bcm2835_dma_probe(struct platform_device *pdev)
 	if (!od)
 		return -ENOMEM;
 
-	pdev->dev.dma_parms = &od->dma_parms;
 	dma_set_max_seg_size(&pdev->dev, 0x3FFFFFFF);
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	base = devm_ioremap_resource(&pdev->dev, res);
+	base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(base))
 		return PTR_ERR(base);
 
@@ -1024,28 +1040,26 @@ err_no_dma:
 	return rc;
 }
 
-static int bcm2835_dma_remove(struct platform_device *pdev)
+static void bcm2835_dma_remove(struct platform_device *pdev)
 {
 	struct bcm2835_dmadev *od = platform_get_drvdata(pdev);
 
 	dma_async_device_unregister(&od->ddev);
 	bcm2835_dma_free(od);
-
-	return 0;
 }
 
 static struct platform_driver bcm2835_dma_driver = {
 	.probe	= bcm2835_dma_probe,
-	.remove	= bcm2835_dma_remove,
+	.remove = bcm2835_dma_remove,
 	.driver = {
 		.name = "bcm2835-dma",
 		.of_match_table = of_match_ptr(bcm2835_dma_of_match),
+		.pm = pm_ptr(&bcm2835_dma_pm_ops),
 	},
 };
 
 module_platform_driver(bcm2835_dma_driver);
 
-MODULE_ALIAS("platform:bcm2835-dma");
 MODULE_DESCRIPTION("BCM2835 DMA engine driver");
 MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
 MODULE_LICENSE("GPL");