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

   1 From 83d2cb1c64c5a34f23b34fcee715a68be230c232 Mon Sep 17 00:00:00 2001
   2 From: Peng Ma <peng.ma@nxp.com>
   3 Date: Thu, 12 Dec 2019 03:38:10 +0000
   4 Subject: [PATCH] dmaengine: fsl-edma: Add eDMA support for QorIQ LS1028A
   5  platform
   6
   7 Our platforms(such as LS1021A, LS1012A, LS1043A, LS1046A, LS1028A) with
   8 below registers(CHCFG0 - CHCFG15) of eDMA as follows:
   9 *-----------------------------------------------------------*
  10 |     Offset   |        OTHERS                  |               LS1028A                 |
  11 |--------------|--------------------|-----------------------|
  12 |     0x0      |        CHCFG0      |           CHCFG3      |
  13 |--------------|--------------------|-----------------------|
  14 |     0x1      |        CHCFG1      |           CHCFG2      |
  15 |--------------|--------------------|-----------------------|
  16 |     0x2      |        CHCFG2      |           CHCFG1      |
  17 |--------------|--------------------|-----------------------|
  18 |     0x3      |        CHCFG3      |           CHCFG0      |
  19 |--------------|--------------------|-----------------------|
  20 |     ...      |        ......      |           ......      |
  21 |--------------|--------------------|-----------------------|
  22 |     0xC      |        CHCFG12     |           CHCFG15     |
  23 |--------------|--------------------|-----------------------|
  24 |     0xD      |        CHCFG13     |           CHCFG14     |
  25 |--------------|--------------------|-----------------------|
  26 |     0xE      |        CHCFG14     |           CHCFG13     |
  27 |--------------|--------------------|-----------------------|
  28 |     0xF      |        CHCFG15     |           CHCFG12     |
  29 *-----------------------------------------------------------*
  30
  31 This patch is to improve edma driver to fit LS1028A platform.
  32
  33 Signed-off-by: Peng Ma <peng.ma@nxp.com>
  34 Reviewed-by: Robin Gong <yibin.gong@nxp.com>
  35 Link: https://lore.kernel.org/r/20191212033714.4090-1-peng.ma@nxp.com
  36 Signed-off-by: Vinod Koul <vkoul@kernel.org>
  37 ---
  38  drivers/dma/fsl-edma-common.c | 5 +++++
  39  drivers/dma/fsl-edma-common.h | 1 +
  40  drivers/dma/fsl-edma.c        | 8 ++++++++
  41  3 files changed, 14 insertions(+)
  42
  43 --- a/drivers/dma/fsl-edma-common.c
  44 +++ b/drivers/dma/fsl-edma-common.c
  45 @@ -109,10 +109,15 @@ void fsl_edma_chan_mux(struct fsl_edma_c
  46         u32 ch = fsl_chan->vchan.chan.chan_id;
  47         void __iomem *muxaddr;
  48         unsigned int chans_per_mux, ch_off;
  49 +       int endian_diff[4] = {3, 1, -1, -3};
  50         u32 dmamux_nr = fsl_chan->edma->drvdata->dmamuxs;
  51
  52         chans_per_mux = fsl_chan->edma->n_chans / dmamux_nr;
  53         ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux;
  54 +
  55 +       if (fsl_chan->edma->drvdata->mux_swap)
  56 +               ch_off += endian_diff[ch_off % 4];
  57 +
  58         muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux];
  59         slot = EDMAMUX_CHCFG_SOURCE(slot);
  60
  61 --- a/drivers/dma/fsl-edma-common.h
  62 +++ b/drivers/dma/fsl-edma-common.h
  63 @@ -148,6 +148,7 @@ struct fsl_edma_drvdata {
  64         enum edma_version       version;
  65         u32                     dmamuxs;
  66         bool                    has_dmaclk;
  67 +       bool                    mux_swap;
  68         int                     (*setup_irq)(struct platform_device *pdev,
  69                                              struct fsl_edma_engine *fsl_edma);
  70  };
  71 --- a/drivers/dma/fsl-edma.c
  72 +++ b/drivers/dma/fsl-edma.c
  73 @@ -241,6 +241,13 @@ static struct fsl_edma_drvdata vf610_dat
  74         .setup_irq = fsl_edma_irq_init,
  75  };
  76
  77 +static struct fsl_edma_drvdata ls1028a_data = {
  78 +       .version = v1,
  79 +       .dmamuxs = DMAMUX_NR,
  80 +       .mux_swap = true,
  81 +       .setup_irq = fsl_edma_irq_init,
  82 +};
  83 +
  84  static struct fsl_edma_drvdata imx7ulp_data = {
  85         .version = v3,
  86         .dmamuxs = 1,
  87 @@ -250,6 +257,7 @@ static struct fsl_edma_drvdata imx7ulp_d
  88
  89  static const struct of_device_id fsl_edma_dt_ids[] = {
  90         { .compatible = "fsl,vf610-edma", .data = &vf610_data},
  91 +       { .compatible = "fsl,ls1028a-edma", .data = &ls1028a_data},
  92         { .compatible = "fsl,imx7ulp-edma", .data = &imx7ulp_data},
  93         { /* sentinel */ }
  94  };