openwrt/target/linux/layerscape/patches-5.4/806-dma-0028-dmaengine-fsl-edma-Add-eDMA-support-for-QorIQ-LS1028.patch

From 83d2cb1c64c5a34f23b34fcee715a68be230c232 Mon Sep 17 00:00:00 2001
From: Peng Ma <peng.ma@nxp.com>
Date: Thu, 12 Dec 2019 03:38:10 +0000
Subject: [PATCH] dmaengine: fsl-edma: Add eDMA support for QorIQ LS1028A
 platform

Our platforms(such as LS1021A, LS1012A, LS1043A, LS1046A, LS1028A) with
below registers(CHCFG0 - CHCFG15) of eDMA as follows:
*-----------------------------------------------------------*
|     Offset   |	OTHERS			|		LS1028A			|
|--------------|--------------------|-----------------------|
|     0x0      |        CHCFG0      |           CHCFG3      |
|--------------|--------------------|-----------------------|
|     0x1      |        CHCFG1      |           CHCFG2      |
|--------------|--------------------|-----------------------|
|     0x2      |        CHCFG2      |           CHCFG1      |
|--------------|--------------------|-----------------------|
|     0x3      |        CHCFG3      |           CHCFG0      |
|--------------|--------------------|-----------------------|
|     ...      |        ......      |           ......      |
|--------------|--------------------|-----------------------|
|     0xC      |        CHCFG12     |           CHCFG15     |
|--------------|--------------------|-----------------------|
|     0xD      |        CHCFG13     |           CHCFG14     |
|--------------|--------------------|-----------------------|
|     0xE      |        CHCFG14     |           CHCFG13     |
|--------------|--------------------|-----------------------|
|     0xF      |        CHCFG15     |           CHCFG12     |
*-----------------------------------------------------------*

This patch is to improve edma driver to fit LS1028A platform.

Signed-off-by: Peng Ma <peng.ma@nxp.com>
Reviewed-by: Robin Gong <yibin.gong@nxp.com>
Link: https://lore.kernel.org/r/20191212033714.4090-1-peng.ma@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
---
 drivers/dma/fsl-edma-common.c | 5 +++++
 drivers/dma/fsl-edma-common.h | 1 +
 drivers/dma/fsl-edma.c        | 8 ++++++++
 3 files changed, 14 insertions(+)

--- a/drivers/dma/fsl-edma-common.c
+++ b/drivers/dma/fsl-edma-common.c
@@ -109,10 +109,15 @@ void fsl_edma_chan_mux(struct fsl_edma_c
 	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};
 	u32 dmamux_nr = fsl_chan->edma->drvdata->dmamuxs;
 
 	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->drvdata->mux_swap)
+		ch_off += endian_diff[ch_off % 4];
+
 	muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux];
 	slot = EDMAMUX_CHCFG_SOURCE(slot);
 
--- a/drivers/dma/fsl-edma-common.h
+++ b/drivers/dma/fsl-edma-common.h
@@ -148,6 +148,7 @@ struct fsl_edma_drvdata {
 	enum edma_version	version;
 	u32			dmamuxs;
 	bool			has_dmaclk;
+	bool			mux_swap;
 	int			(*setup_irq)(struct platform_device *pdev,
 					     struct fsl_edma_engine *fsl_edma);
 };
--- a/drivers/dma/fsl-edma.c
+++ b/drivers/dma/fsl-edma.c
@@ -241,6 +241,13 @@ static struct fsl_edma_drvdata vf610_dat
 	.setup_irq = fsl_edma_irq_init,
 };
 
+static struct fsl_edma_drvdata ls1028a_data = {
+	.version = v1,
+	.dmamuxs = DMAMUX_NR,
+	.mux_swap = true,
+	.setup_irq = fsl_edma_irq_init,
+};
+
 static struct fsl_edma_drvdata imx7ulp_data = {
 	.version = v3,
 	.dmamuxs = 1,
@@ -250,6 +257,7 @@ static struct fsl_edma_drvdata imx7ulp_d
 
 static const struct of_device_id fsl_edma_dt_ids[] = {
 	{ .compatible = "fsl,vf610-edma", .data = &vf610_data},
+	{ .compatible = "fsl,ls1028a-edma", .data = &ls1028a_data},
 	{ .compatible = "fsl,imx7ulp-edma", .data = &imx7ulp_data},
 	{ /* sentinel */ }
 };