diff options
| -rw-r--r-- | drivers/dma/dma-axi-dmac.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/drivers/dma/dma-axi-dmac.c b/drivers/dma/dma-axi-dmac.c index 8e64b81c2d3c..0984ae6eb155 100644 --- a/drivers/dma/dma-axi-dmac.c +++ b/drivers/dma/dma-axi-dmac.c @@ -637,7 +637,7 @@ static int axi_dmac_parse_chan_dt(struct device_node *of_chan, return 0; } -static void axi_dmac_detect_caps(struct axi_dmac *dmac) +static int axi_dmac_detect_caps(struct axi_dmac *dmac) { struct axi_dmac_chan *chan = &dmac->chan; @@ -653,6 +653,24 @@ static void axi_dmac_detect_caps(struct axi_dmac *dmac) chan->max_length = axi_dmac_read(dmac, AXI_DMAC_REG_X_LENGTH); if (chan->max_length != UINT_MAX) chan->max_length++; + + axi_dmac_write(dmac, AXI_DMAC_REG_DEST_ADDRESS, 0xffffffff); + if (axi_dmac_read(dmac, AXI_DMAC_REG_DEST_ADDRESS) == 0 && + chan->dest_type == AXI_DMAC_BUS_TYPE_AXI_MM) { + dev_err(dmac->dma_dev.dev, + "Destination memory-mapped interface not supported."); + return -ENODEV; + } + + axi_dmac_write(dmac, AXI_DMAC_REG_SRC_ADDRESS, 0xffffffff); + if (axi_dmac_read(dmac, AXI_DMAC_REG_SRC_ADDRESS) == 0 && + chan->src_type == AXI_DMAC_BUS_TYPE_AXI_MM) { + dev_err(dmac->dma_dev.dev, + "Source memory-mapped interface not supported."); + return -ENODEV; + } + + return 0; } static int axi_dmac_probe(struct platform_device *pdev) @@ -728,7 +746,9 @@ static int axi_dmac_probe(struct platform_device *pdev) if (ret < 0) return ret; - axi_dmac_detect_caps(dmac); + ret = axi_dmac_detect_caps(dmac); + if (ret) + goto err_clk_disable; axi_dmac_write(dmac, AXI_DMAC_REG_IRQ_MASK, 0x00); |