linux-kernel - [PATCH 2/7] dmaengine: xilinx_vdma: Add quirks support to differentiate differnet IP cores

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Message-ID: <1458062592-27981-3-git-send-email-appanad@xilinx.com>
Date:	Tue, 15 Mar 2016 22:53:07 +0530
From:	Kedareswara rao Appana <appana.durga.rao@...inx.com>
To:	<dan.j.williams@...el.com>, <vinod.koul@...el.com>,
	<michal.simek@...inx.com>, <soren.brinkmann@...inx.com>,
	<appanad@...inx.com>, <moritz.fischer@...us.com>,
	<laurent.pinchart@...asonboard.com>, <luis@...ethencourt.com>,
	<anirudh@...inx.com>
CC:	<dmaengine@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH 2/7] dmaengine: xilinx_vdma: Add quirks support to differentiate differnet IP cores

This patch adds quirks support in the driver to differentiate differnet IP cores.

Signed-off-by: Kedareswara rao Appana <appanad@...inx.com>
---
 drivers/dma/xilinx/xilinx_vdma.c | 36 ++++++++++++++++++++++++++++++------
 1 file changed, 30 insertions(+), 6 deletions(-)

diff --git a/drivers/dma/xilinx/xilinx_vdma.c b/drivers/dma/xilinx/xilinx_vdma.c
index 7ab6793..f682bef 100644
--- a/drivers/dma/xilinx/xilinx_vdma.c
+++ b/drivers/dma/xilinx/xilinx_vdma.c
@@ -139,6 +139,8 @@
 /* Delay loop counter to prevent hardware failure */
 #define XILINX_VDMA_LOOP_COUNT		1000000
 
+#define AXIVDMA_SUPPORT		BIT(0)
+
 /**
  * struct xilinx_vdma_desc_hw - Hardware Descriptor
  * @next_desc: Next Descriptor Pointer @0x00
@@ -240,6 +242,7 @@ struct xilinx_vdma_chan {
  * @chan: Driver specific VDMA channel
  * @has_sg: Specifies whether Scatter-Gather is present or not
  * @flush_on_fsync: Flush on frame sync
+ * @quirks: Needed for different IP cores
  */
 struct xilinx_vdma_device {
 	void __iomem *regs;
@@ -248,6 +251,15 @@ struct xilinx_vdma_device {
 	struct xilinx_vdma_chan *chan[XILINX_VDMA_MAX_CHANS_PER_DEVICE];
 	bool has_sg;
 	u32 flush_on_fsync;
+	u32 quirks;
+};
+
+/**
+ * struct xdma_platform_data - DMA platform structure
+ * @quirks: quirks for platform specific data.
+ */
+struct xdma_platform_data {
+	u32 quirks;
 };
 
 /* Macros */
@@ -1239,6 +1251,16 @@ static struct dma_chan *of_dma_xilinx_xlate(struct of_phandle_args *dma_spec,
 	return dma_get_slave_channel(&xdev->chan[chan_id]->common);
 }
 
+static const struct xdma_platform_data xvdma_def = {
+	.quirks = AXIVDMA_SUPPORT,
+};
+
+static const struct of_device_id xilinx_vdma_of_ids[] = {
+	{ .compatible = "xlnx,axi-vdma-1.00.a", .data = &xvdma_def},
+	{}
+};
+MODULE_DEVICE_TABLE(of, xilinx_vdma_of_ids);
+
 /**
  * xilinx_vdma_probe - Driver probe function
  * @pdev: Pointer to the platform_device structure
@@ -1251,6 +1273,7 @@ static int xilinx_vdma_probe(struct platform_device *pdev)
 	struct xilinx_vdma_device *xdev;
 	struct device_node *child;
 	struct resource *io;
+	const struct of_device_id *match;
 	u32 num_frames;
 	int i, err;
 
@@ -1259,6 +1282,13 @@ static int xilinx_vdma_probe(struct platform_device *pdev)
 	if (!xdev)
 		return -ENOMEM;
 
+	match = of_match_node(xilinx_vdma_of_ids, pdev->dev.of_node);
+	if (match && match->data) {
+		const struct xdma_platform_data *data = match->data;
+
+		xdev->quirks = data->quirks;
+	}
+
 	xdev->dev = &pdev->dev;
 
 	/* Request and map I/O memory */
@@ -1356,12 +1386,6 @@ static int xilinx_vdma_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static const struct of_device_id xilinx_vdma_of_ids[] = {
-	{ .compatible = "xlnx,axi-vdma-1.00.a",},
-	{}
-};
-MODULE_DEVICE_TABLE(of, xilinx_vdma_of_ids);
-
 static struct platform_driver xilinx_vdma_driver = {
 	.driver = {
 		.name = "xilinx-vdma",
-- 
2.1.2