linux-kernel - [PATCH v2 09/14] dma: edma: Implement device_slave

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Message-ID: <1396357575-30585-10-git-send-email-peter.ujfalusi@ti.com>
Date:	Tue, 1 Apr 2014 16:06:10 +0300
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	<dan.j.williams@...el.com>, <vinod.koul@...el.com>,
	<nsekhar@...com>
CC:	<dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<joelf@...com>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>,
	<davinci-linux-open-source@...ux.davincidsp.com>,
	<mporter@...aro.org>
Subject: [PATCH v2 09/14] dma: edma: Implement device_slave_caps callback

With the callback implemented omap-dma can provide information to client
drivers regarding to supported address widths, directions, residue
granularity, etc.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
 drivers/dma/edma.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index 10048b40fac8..855766672aa9 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -855,6 +855,23 @@ static void __init edma_chan_init(struct edma_cc *ecc,
 	}
 }
 
+#define EDMA_DMA_BUSWIDTHS	(BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
+				 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
+				 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
+
+static int edma_dma_device_slave_caps(struct dma_chan *dchan,
+				      struct dma_slave_caps *caps)
+{
+	caps->src_addr_widths = EDMA_DMA_BUSWIDTHS;
+	caps->dstn_addr_widths = EDMA_DMA_BUSWIDTHS;
+	caps->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
+	caps->cmd_pause = true;
+	caps->cmd_terminate = true;
+	caps->residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
+
+	return 0;
+}
+
 static void edma_dma_init(struct edma_cc *ecc, struct dma_device *dma,
 			  struct device *dev)
 {
@@ -865,6 +882,7 @@ static void edma_dma_init(struct edma_cc *ecc, struct dma_device *dma,
 	dma->device_issue_pending = edma_issue_pending;
 	dma->device_tx_status = edma_tx_status;
 	dma->device_control = edma_control;
+	dma->device_slave_caps = edma_dma_device_slave_caps;
 	dma->dev = dev;
 
 	INIT_LIST_HEAD(&dma->channels);
-- 
1.9.1

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