diff options
Diffstat (limited to 'drivers/dma/xilinx/xilinx_dma.c')
| -rw-r--r-- | drivers/dma/xilinx/xilinx_dma.c | 44 |
1 files changed, 24 insertions, 20 deletions
diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c index c12442312595..02880963092f 100644 --- a/drivers/dma/xilinx/xilinx_dma.c +++ b/drivers/dma/xilinx/xilinx_dma.c @@ -190,6 +190,8 @@ /* AXI CDMA Specific Masks */ #define XILINX_CDMA_CR_SGMODE BIT(3) +#define xilinx_prep_dma_addr_t(addr) \ + ((dma_addr_t)((u64)addr##_##msb << 32 | (addr))) /** * struct xilinx_vdma_desc_hw - Hardware Descriptor * @next_desc: Next Descriptor Pointer @0x00 @@ -887,6 +889,24 @@ static int xilinx_dma_alloc_chan_resources(struct dma_chan *dchan) chan->id); return -ENOMEM; } + /* + * For cyclic DMA mode we need to program the tail Descriptor + * register with a value which is not a part of the BD chain + * so allocating a desc segment during channel allocation for + * programming tail descriptor. + */ + chan->cyclic_seg_v = dma_zalloc_coherent(chan->dev, + sizeof(*chan->cyclic_seg_v), + &chan->cyclic_seg_p, GFP_KERNEL); + if (!chan->cyclic_seg_v) { + dev_err(chan->dev, + "unable to allocate desc segment for cyclic DMA\n"); + dma_free_coherent(chan->dev, sizeof(*chan->seg_v) * + XILINX_DMA_NUM_DESCS, chan->seg_v, + chan->seg_p); + return -ENOMEM; + } + chan->cyclic_seg_v->phys = chan->cyclic_seg_p; for (i = 0; i < XILINX_DMA_NUM_DESCS; i++) { chan->seg_v[i].hw.next_desc = @@ -922,24 +942,6 @@ static int xilinx_dma_alloc_chan_resources(struct dma_chan *dchan) return -ENOMEM; } - if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) { - /* - * For cyclic DMA mode we need to program the tail Descriptor - * register with a value which is not a part of the BD chain - * so allocating a desc segment during channel allocation for - * programming tail descriptor. - */ - chan->cyclic_seg_v = dma_zalloc_coherent(chan->dev, - sizeof(*chan->cyclic_seg_v), - &chan->cyclic_seg_p, GFP_KERNEL); - if (!chan->cyclic_seg_v) { - dev_err(chan->dev, - "unable to allocate desc segment for cyclic DMA\n"); - return -ENOMEM; - } - chan->cyclic_seg_v->phys = chan->cyclic_seg_p; - } - dma_cookie_init(dchan); if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) { @@ -1245,8 +1247,10 @@ static void xilinx_cdma_start_transfer(struct xilinx_dma_chan *chan) hw = &segment->hw; - xilinx_write(chan, XILINX_CDMA_REG_SRCADDR, hw->src_addr); - xilinx_write(chan, XILINX_CDMA_REG_DSTADDR, hw->dest_addr); + xilinx_write(chan, XILINX_CDMA_REG_SRCADDR, + xilinx_prep_dma_addr_t(hw->src_addr)); + xilinx_write(chan, XILINX_CDMA_REG_DSTADDR, + xilinx_prep_dma_addr_t(hw->dest_addr)); /* Start the transfer */ dma_ctrl_write(chan, XILINX_DMA_REG_BTT, |