From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peng Ma Subject: [PATCH 3/4] dmaengine: fsl-edma: support little endian for edma driver Date: Mon, 6 May 2019 09:03:43 +0000 Message-ID: <20190506090344.37784-3-peng.ma@nxp.com> References: <20190506090344.37784-1-peng.ma@nxp.com> Return-path: In-Reply-To: <20190506090344.37784-1-peng.ma@nxp.com> Sender: linux-kernel-owner@vger.kernel.org To: vkoul@kernel.org, robh+dt@kernel.org, shawnguo@kernel.org, mark.rutland@arm.com, leoyang.li@nxp.com Cc: dan.j.williams@intel.com, dmaengine@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Peng Ma List-Id: devicetree@vger.kernel.org improve edma driver to support little endian. Signed-off-by: Peng Ma --- 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