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dmaengine: Move all map_sg/unmap_sg for slave channel to its client

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Dan Williams wrote:
... DMA-slave clients request specific channels and know the hardware
details at a low level, so it should not be too high an expectation to
push dma mapping responsibility to the client.

Also this patch includes DMA_COMPL_{SRC,DEST}_UNMAP_SINGLE support for
dw_dmac driver.

Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Atsushi Nemoto
2009-09-08 17:53:05 -07:00
committed by Dan Williams
parent bbea0b6e0d
commit 657a77fa72
3 changed files with 49 additions and 34 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/mmc/host/atmel-mci.c
View File

@@ -576,6 +576,7 @@ atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
struct scatterlist *sg;
unsigned int i;
enum dma_data_direction direction;
unsigned int sglen;
/*
* We don't do DMA on "complex" transfers, i.e. with
@@ -605,11 +606,14 @@ atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
else
direction = DMA_TO_DEVICE;
sglen = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, direction);
if (sglen != data->sg_len)
goto unmap_exit;
desc = chan->device->device_prep_slave_sg(chan,
data->sg, data->sg_len, direction,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc)
return -ENOMEM;
goto unmap_exit;
host->dma.data_desc = desc;
desc->callback = atmci_dma_complete;
@@ -620,6 +624,9 @@ atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
chan->device->device_issue_pending(chan);
return 0;
unmap_exit:
dma_unmap_sg(&host->pdev->dev, data->sg, sglen, direction);
return -ENOMEM;
}
#else /* CONFIG_MMC_ATMELMCI_DMA */