linux-kernel - [PATCH 08/21] ARM/dmaengine: edma: Remove limitation on the number of eDMA controllers

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Date:	Thu, 10 Sep 2015 11:37:37 +0300
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	<vinod.koul@...el.com>, <nsekhar@...com>, <linux@....linux.org.uk>
CC:	<olof@...om.net>, <arnd@...db.de>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<dmaengine@...r.kernel.org>
Subject: [PATCH 08/21] ARM/dmaengine: edma: Remove limitation on the number of eDMA controllers

bla-bla and bla

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
 arch/arm/common/edma.c | 22 +++++-----------------
 drivers/dma/edma.c     | 17 ++++++++---------
 2 files changed, 13 insertions(+), 26 deletions(-)

diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
index 15b68ce98ec7..0f29997c62df 100644
--- a/arch/arm/common/edma.c
+++ b/arch/arm/common/edma.c
@@ -1227,24 +1227,7 @@ static int edma_probe(struct platform_device *pdev)
 		.parent = &pdev->dev,
 	};
 
-	/* When booting with DT the pdev->id is -1 */
-	if (dev_id < 0)
-		dev_id = arch_num_cc;
-
-	if (dev_id >= EDMA_MAX_CC) {
-		dev_err(dev,
-			"eDMA3 with device id 0 and 1 is supported (id: %d)\n",
-			dev_id);
-		return -EINVAL;
-	}
-
 	if (node) {
-		/* Check if this is a second instance registered */
-		if (arch_num_cc) {
-			dev_err(dev, "only one EDMA instance is supported via DT\n");
-			return -ENODEV;
-		}
-
 		info = edma_setup_info_from_dt(dev, node);
 		if (IS_ERR(info)) {
 			dev_err(dev, "failed to get DT data\n");
@@ -1278,6 +1261,11 @@ static int edma_probe(struct platform_device *pdev)
 
 	cc->dev = dev;
 	cc->id = dev_id;
+	/* When booting with DT the pdev->id is -1 */
+	if (dev_id < 0) {
+		cc->id = 0;
+		dev_id = arch_num_cc;
+	}
 	dev_set_drvdata(dev, cc);
 
 	cc->base = devm_ioremap_resource(dev, mem);
diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index 53d48b2a700d..fc91ab9dd1bb 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -991,14 +991,12 @@ static void edma_dma_init(struct edma_cc *ecc, struct dma_device *dma,
 	INIT_LIST_HEAD(&dma->channels);
 }
 
-static struct of_dma_filter_info edma_filter_info = {
-	.filter_fn = edma_filter_fn,
-};
-
 static int edma_probe(struct platform_device *pdev)
 {
 	struct edma_cc *ecc;
 	struct device_node *parent_node = pdev->dev.parent->of_node;
+	struct platform_device *parent_pdev =
+					to_platform_device(pdev->dev.parent);
 	int ret;
 
 	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
@@ -1015,7 +1013,10 @@ static int edma_probe(struct platform_device *pdev)
 	if (!ecc->cc)
 		return -ENODEV;
 
-	ecc->ctlr = pdev->id;
+	ecc->ctlr = parent_pdev->id;
+	if (ecc->ctlr < 0)
+		ecc->ctlr = 0;
+
 	ecc->dummy_slot = edma_alloc_slot(ecc->cc, EDMA_SLOT_ANY);
 	if (ecc->dummy_slot < 0) {
 		dev_err(&pdev->dev, "Can't allocate PaRAM dummy slot\n");
@@ -1038,10 +1039,8 @@ static int edma_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, ecc);
 
 	if (parent_node) {
-		dma_cap_set(DMA_SLAVE, edma_filter_info.dma_cap);
-		dma_cap_set(DMA_CYCLIC, edma_filter_info.dma_cap);
-		of_dma_controller_register(parent_node, of_dma_simple_xlate,
-					   &edma_filter_info);
+		of_dma_controller_register(parent_node, of_dma_xlate_by_chan_id,
+					   &ecc->dma_slave);
 	}
 
 	dev_info(&pdev->dev, "TI EDMA DMA engine driver\n");
-- 
2.5.1

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