linux-kernel - [PATCH v3 04/13] dmaengine: imx-dma: remove 'imxdma_setup_mem2mem

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Message-Id: <1331306449-28591-5-git-send-email-javier.martin@vista-silicon.com>
Date:	Fri,  9 Mar 2012 16:20:40 +0100
From:	Javier Martin <javier.martin@...ta-silicon.com>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, dan.j.williams@...el.com,
	vinod.koul@...el.com, linux@....linux.org.uk,
	kernel@...gutronix.de,
	Javier Martin <javier.martin@...ta-silicon.com>
Subject: [PATCH v3 04/13] dmaengine: imx-dma: remove 'imxdma_setup_mem2mem_hw' function.

This function is only used once in the driver and has a lot of checks
that are not needed anymore. For this reason it's been merged
with 'imxdma_enable_hw'.

Signed-off-by: Javier Martin <javier.martin@...ta-silicon.com>
---
 drivers/dma/imx-dma.c |   57 ++++++++++++-------------------------------------
 1 files changed, 14 insertions(+), 43 deletions(-)

diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c
index 400082d..f86ac06 100644
--- a/drivers/dma/imx-dma.c
+++ b/drivers/dma/imx-dma.c
@@ -258,41 +258,6 @@ static inline int imxdma_sg_next(struct imxdma_desc *d, struct scatterlist *sg)
 	return now;
 }
 
-static int
-imxdma_setup_mem2mem_hw(struct imxdma_channel *imxdmac, dma_addr_t dma_address,
-		     unsigned int dma_length, unsigned int dev_addr)
-{
-	int channel = imxdmac->channel;
-
-	imxdmac->internal.sg = NULL;
-
-	if (!dma_address) {
-		printk(KERN_ERR "imxdma%d: imx_dma_setup_single null address\n",
-		       channel);
-		return -EINVAL;
-	}
-
-	if (!dma_length) {
-		printk(KERN_ERR "imxdma%d: imx_dma_setup_single zero length\n",
-		       channel);
-		return -EINVAL;
-	}
-
-	pr_debug("imxdma%d: %s dma_addressg=0x%08x dma_length=%d "
-		"dev_addr=0x%08x for write\n",
-		channel, __func__, (unsigned int)dma_address,
-		dma_length, dev_addr);
-
-	imx_dmav1_writel(dma_address, DMA_SAR(channel));
-	imx_dmav1_writel(dev_addr, DMA_DAR(channel));
-	imx_dmav1_writel(imxdmac->internal.ccr_to_device,
-			 DMA_CCR(channel));
-
-	imx_dmav1_writel(dma_length, DMA_CNTR(channel));
-
-	return 0;
-}
-
 static void imxdma_enable_hw(struct imxdma_desc *d)
 {
 	struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
@@ -584,20 +549,26 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id)
 static int imxdma_xfer_desc(struct imxdma_desc *d)
 {
 	struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
+	struct imxdma_engine *imxdma = imxdmac->imxdma;
 	int ret;
 
 	/* Configure and enable */
 	switch (d->type) {
 	case IMXDMA_DESC_MEMCPY:
-		ret = imxdma_config_channel_hw(imxdmac,
-					  d->config_port, d->config_mem, 0, 0);
-		if (ret < 0)
-			return ret;
-		ret = imxdma_setup_mem2mem_hw(imxdmac, d->src, d->len, d->dest);
-		if (ret < 0)
-			return ret;
-		break;
+		imxdmac->internal.sg = NULL;
+
+		imx_dmav1_writel(d->src, DMA_SAR(imxdmac->channel));
+		imx_dmav1_writel(d->dest, DMA_DAR(imxdmac->channel));
+		imx_dmav1_writel(d->config_mem | (d->config_port << 2),
+			 DMA_CCR(imxdmac->channel));
 
+		imx_dmav1_writel(d->len, DMA_CNTR(imxdmac->channel));
+
+		dev_dbg(imxdma->dev, "%s channel: %d dest=0x%08x src=0x%08x "
+			"dma_length=%d\n", __func__, imxdmac->channel,
+			d->dest, d->src, d->len);
+
+		break;
 	/* Cyclic transfer is the same as slave_sg with special sg configuration. */
 	case IMXDMA_DESC_CYCLIC:
 	case IMXDMA_DESC_SLAVE_SG:
-- 
1.7.0.4

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