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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>
This commit is contained in:
parent
bbea0b6e0d
commit
657a77fa72
3 changed files with 49 additions and 34 deletions
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@ -253,25 +253,28 @@ atc_chain_complete(struct at_dma_chan *atchan, struct at_desc *desc)
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list_move(&desc->desc_node, &atchan->free_list);
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/* unmap dma addresses */
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if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
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if (txd->flags & DMA_COMPL_DEST_UNMAP_SINGLE)
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dma_unmap_single(chan2parent(&atchan->chan_common),
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desc->lli.daddr,
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desc->len, DMA_FROM_DEVICE);
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else
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dma_unmap_page(chan2parent(&atchan->chan_common),
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desc->lli.daddr,
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desc->len, DMA_FROM_DEVICE);
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}
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if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
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if (txd->flags & DMA_COMPL_SRC_UNMAP_SINGLE)
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dma_unmap_single(chan2parent(&atchan->chan_common),
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desc->lli.saddr,
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desc->len, DMA_TO_DEVICE);
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else
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dma_unmap_page(chan2parent(&atchan->chan_common),
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desc->lli.saddr,
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desc->len, DMA_TO_DEVICE);
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if (!atchan->chan_common.private) {
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struct device *parent = chan2parent(&atchan->chan_common);
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if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
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if (txd->flags & DMA_COMPL_DEST_UNMAP_SINGLE)
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dma_unmap_single(parent,
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desc->lli.daddr,
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desc->len, DMA_FROM_DEVICE);
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else
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dma_unmap_page(parent,
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desc->lli.daddr,
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desc->len, DMA_FROM_DEVICE);
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}
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if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
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if (txd->flags & DMA_COMPL_SRC_UNMAP_SINGLE)
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dma_unmap_single(parent,
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desc->lli.saddr,
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desc->len, DMA_TO_DEVICE);
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else
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dma_unmap_page(parent,
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desc->lli.saddr,
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desc->len, DMA_TO_DEVICE);
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}
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}
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/*
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@ -647,8 +650,6 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
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reg_width = atslave->reg_width;
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sg_len = dma_map_sg(chan2parent(chan), sgl, sg_len, direction);
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ctrla = ATC_DEFAULT_CTRLA | atslave->ctrla;
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ctrlb = ATC_DEFAULT_CTRLB | ATC_IEN;
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@ -212,16 +212,25 @@ dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc)
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list_splice_init(&desc->tx_list, &dwc->free_list);
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list_move(&desc->desc_node, &dwc->free_list);
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/*
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* We use dma_unmap_page() regardless of how the buffers were
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* mapped before they were submitted...
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*/
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if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP))
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dma_unmap_page(chan2parent(&dwc->chan), desc->lli.dar,
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desc->len, DMA_FROM_DEVICE);
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if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP))
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dma_unmap_page(chan2parent(&dwc->chan), desc->lli.sar,
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desc->len, DMA_TO_DEVICE);
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if (!dwc->chan.private) {
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struct device *parent = chan2parent(&dwc->chan);
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if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
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if (txd->flags & DMA_COMPL_DEST_UNMAP_SINGLE)
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dma_unmap_single(parent, desc->lli.dar,
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desc->len, DMA_FROM_DEVICE);
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else
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dma_unmap_page(parent, desc->lli.dar,
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desc->len, DMA_FROM_DEVICE);
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}
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if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
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if (txd->flags & DMA_COMPL_SRC_UNMAP_SINGLE)
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dma_unmap_single(parent, desc->lli.sar,
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desc->len, DMA_TO_DEVICE);
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else
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dma_unmap_page(parent, desc->lli.sar,
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desc->len, DMA_TO_DEVICE);
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}
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}
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/*
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* The API requires that no submissions are done from a
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@ -658,8 +667,6 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
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reg_width = dws->reg_width;
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prev = first = NULL;
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sg_len = dma_map_sg(chan2parent(chan), sgl, sg_len, direction);
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switch (direction) {
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case DMA_TO_DEVICE:
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ctllo = (DWC_DEFAULT_CTLLO
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@ -576,6 +576,7 @@ atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
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struct scatterlist *sg;
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unsigned int i;
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enum dma_data_direction direction;
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unsigned int sglen;
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/*
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* We don't do DMA on "complex" transfers, i.e. with
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@ -605,11 +606,14 @@ atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
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else
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direction = DMA_TO_DEVICE;
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sglen = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, direction);
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if (sglen != data->sg_len)
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goto unmap_exit;
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desc = chan->device->device_prep_slave_sg(chan,
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data->sg, data->sg_len, direction,
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DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
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if (!desc)
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return -ENOMEM;
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goto unmap_exit;
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host->dma.data_desc = desc;
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desc->callback = atmci_dma_complete;
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@ -620,6 +624,9 @@ atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
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chan->device->device_issue_pending(chan);
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return 0;
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unmap_exit:
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dma_unmap_sg(&host->pdev->dev, data->sg, sglen, direction);
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return -ENOMEM;
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}
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#else /* CONFIG_MMC_ATMELMCI_DMA */
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