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| author | Atsushi Nemoto <anemo@mba.ocn.ne.jp> | 2009-09-08 17:53:05 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2009-09-08 17:53:05 -0700 |
| commit | 657a77fa7284d8ae28dfa48f1dc5d919bf5b2843 (patch) | |
| tree | 74fd6b5c2c35dcea18928a600ff34c04f8626cb6 /drivers/mmc | |
| parent | bbea0b6e0d214ef1511b9c6ccf3af26b38f0af7d (diff) | |
| download | kernel_samsung_smdk4412-657a77fa7284d8ae28dfa48f1dc5d919bf5b2843.zip kernel_samsung_smdk4412-657a77fa7284d8ae28dfa48f1dc5d919bf5b2843.tar.gz kernel_samsung_smdk4412-657a77fa7284d8ae28dfa48f1dc5d919bf5b2843.tar.bz2 | |
dmaengine: Move all map_sg/unmap_sg for slave channel to its client
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>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/atmel-mci.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c index 7b603e4..5e10d36 100644 --- a/drivers/mmc/host/atmel-mci.c +++ b/drivers/mmc/host/atmel-mci.c @@ -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 */ |