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>

diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c
index b1a7ca9..5697c36 100644 (file)
--- 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_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};
        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);
 

diff --git a/drivers/dma/fsl-edma-common.h b/drivers/dma/fsl-edma-common.h
index 5eaa290..67e4225 100644 (file)
--- a/drivers/dma/fsl-edma-common.h
+++ b/drivers/dma/fsl-edma-common.h
@@ -147,6 +147,7 @@ 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);
 };

diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c
index b626c06..eff7ebd 100644 (file)
--- a/drivers/dma/fsl-edma.c
+++ b/drivers/dma/fsl-edma.c
@@ -233,6 +233,13 @@ static struct fsl_edma_drvdata vf610_data = {
        .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,
@@ -242,6 +249,7 @@ static struct fsl_edma_drvdata imx7ulp_data = {
 
 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 */ }
 };