linux-kernel - [PATCH 3/4] dmaengine: fsl-edma: support little endian for edma driver

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Date:   Mon,  6 May 2019 09:03:43 +0000
From:   Peng Ma <peng.ma@....com>
To:     vkoul@...nel.org, robh+dt@...nel.org, shawnguo@...nel.org,
        mark.rutland@....com, leoyang.li@....com
Cc:     dan.j.williams@...el.com, dmaengine@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, Peng Ma <peng.ma@....com>
Subject: [PATCH 3/4] dmaengine: fsl-edma: support little endian for edma driver

improve edma driver to support little endian.

Signed-off-by: Peng Ma <peng.ma@....com>
---
 drivers/dma/fsl-edma-common.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c
index 680b2a0..6bf238e 100644
--- a/drivers/dma/fsl-edma-common.c
+++ b/drivers/dma/fsl-edma-common.c
@@ -83,9 +83,14 @@ void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
 	u32 ch = fsl_chan->vchan.chan.chan_id;
 	void __iomem *muxaddr;
 	unsigned int chans_per_mux, ch_off;
+	int endian_diff[4] = {3, 1, -1, -3};
 
 	chans_per_mux = fsl_chan->edma->n_chans / DMAMUX_NR;
 	ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux;
+
+	if (!fsl_chan->edma->big_endian)
+		ch_off += endian_diff[ch_off % 4];
+
 	muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux];
 	slot = EDMAMUX_CHCFG_SOURCE(slot);
 
-- 
1.7.1