linux-kernel - [PATCH 3/3] dmaengine: at_hdmac: add slave config operation

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Message-Id: <1151852b20789636633095406a180335364f4afb.1309259835.git.nicolas.ferre@atmel.com>
Date:	Tue, 28 Jun 2011 13:17:57 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	vinod.koul@...el.com, dan.j.williams@...el.com,
	linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: [PATCH 3/3] dmaengine: at_hdmac: add slave config operation

Only change source/destination peripheral register access width.

Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
 drivers/dma/at_hdmac.c |   29 +++++++++++++++++++++++++++++
 1 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 7096adb..9cb8044 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -954,6 +954,35 @@ static int atc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
 		clear_bit(ATC_IS_PAUSED, &atchan->status);
 
 		spin_unlock_irqrestore(&atchan->lock, flags);
+	} else if (cmd == DMA_SLAVE_CONFIG) {
+		struct dma_slave_config *dmaengine_cfg = (void *)arg;
+		struct at_dma_slave	*atslave = chan->private;
+		enum dma_slave_buswidth sdma_width;
+		enum at_dma_slave_width	atdma_width;
+
+		/* only modify transfer size width */
+		if (!atslave)
+			return -ENXIO;
+
+		if (dmaengine_cfg->direction == DMA_FROM_DEVICE)
+			sdma_width = dmaengine_cfg->src_addr_width;
+		else
+			sdma_width = dmaengine_cfg->dst_addr_width;
+
+		switch (sdma_width) {
+		case DMA_SLAVE_BUSWIDTH_1_BYTE:
+			atdma_width = AT_DMA_SLAVE_WIDTH_8BIT;
+			break;
+		case DMA_SLAVE_BUSWIDTH_2_BYTES:
+			atdma_width = AT_DMA_SLAVE_WIDTH_16BIT;
+			break;
+		case DMA_SLAVE_BUSWIDTH_4_BYTES:
+			atdma_width = AT_DMA_SLAVE_WIDTH_32BIT;
+			break;
+		default:
+			return -EINVAL;
+		}
+		atslave->reg_width = atdma_width;
 	} else if (cmd == DMA_TERMINATE_ALL) {
 		struct at_desc	*desc, *_desc;
 		/*
-- 
1.7.3

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