linux-kernel - [PATCH 2/7] dmaengine: sprd: Get transfer residue depending on the transfer direction

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Message-Id: <fabe5b03c8c3de84bc9fec10de8f20c2fd85441c.1538199697.git.baolin.wang@linaro.org>
Date:   Sat, 29 Sep 2018 13:49:00 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     dan.j.williams@...el.com, vkoul@...nel.org,
        eric.long@...eadtrum.com
Cc:     broonie@...nel.org, baolin.wang@...aro.org,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/7] dmaengine: sprd: Get transfer residue depending on the transfer direction

From: Eric Long <eric.long@...eadtrum.com>

Add one field to save the transfer direction for struct sprd_dma_desc,
which is used to get correct transfer residue depending on the transfer
direction.

[Baolin Wang adds one field to present the transfer direction]
Signed-off-by: Eric Long <eric.long@...eadtrum.com>
Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 drivers/dma/sprd-dma.c |   21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index c226dc93..4f3587b 100644
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -159,6 +159,7 @@ struct sprd_dma_chn_hw {
 struct sprd_dma_desc {
 	struct virt_dma_desc	vd;
 	struct sprd_dma_chn_hw	chn_hw;
+	enum dma_transfer_direction dir;
 };
 
 /* dma channel description */
@@ -331,6 +332,17 @@ static void sprd_dma_stop_and_disable(struct sprd_dma_chn *schan)
 	sprd_dma_disable_chn(schan);
 }
 
+static unsigned long sprd_dma_get_src_addr(struct sprd_dma_chn *schan)
+{
+	unsigned long addr, addr_high;
+
+	addr = readl(schan->chn_base + SPRD_DMA_CHN_SRC_ADDR);
+	addr_high = readl(schan->chn_base + SPRD_DMA_CHN_WARP_PTR) &
+		    SPRD_DMA_HIGH_ADDR_MASK;
+
+	return addr | (addr_high << SPRD_DMA_HIGH_ADDR_OFFSET);
+}
+
 static unsigned long sprd_dma_get_dst_addr(struct sprd_dma_chn *schan)
 {
 	unsigned long addr, addr_high;
@@ -534,7 +546,12 @@ static enum dma_status sprd_dma_tx_status(struct dma_chan *chan,
 		else
 			pos = 0;
 	} else if (schan->cur_desc && schan->cur_desc->vd.tx.cookie == cookie) {
-		pos = sprd_dma_get_dst_addr(schan);
+		struct sprd_dma_desc *sdesc = to_sprd_dma_desc(vd);
+
+		if (sdesc->dir == DMA_DEV_TO_MEM)
+			pos = sprd_dma_get_dst_addr(schan);
+		else
+			pos = sprd_dma_get_src_addr(schan);
 	} else {
 		pos = 0;
 	}
@@ -804,6 +821,8 @@ static int sprd_dma_fill_linklist_desc(struct dma_chan *chan,
 	if (!sdesc)
 		return NULL;
 
+	sdesc->dir = dir;
+
 	for_each_sg(sgl, sg, sglen, i) {
 		len = sg_dma_len(sg);
 
-- 
1.7.9.5