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dmaengine: edma: Add DMA memcpy support 

We add DMA memcpy support to EDMA driver. Successful tests performed using
dmatest kernel module. Copy alignment is set to DMA_SLAVE_BUSWIDTH_4_BYTES and
users must ensure length is aligned so that copy is performed fully.

Signed-off-by: Joel Fernandes <joelf@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Joel Fernandes 2014-04-18 21:50:33 -05:00 committed by Vinod Koul
parent e6fad592b0
commit 8cc3e30bea
1 changed files with 51 additions and 0 deletions
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51
drivers/dma/edma.c
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@ -379,6 +379,11 @@ static int edma_config_pset(struct dma_chan *chan, struct edmacc_param *pset,
src_cidx = 0;
dst_bidx = acnt;
dst_cidx = cidx;
} else if (direction == DMA_MEM_TO_MEM) {
src_bidx = acnt;
src_cidx = cidx;
dst_bidx = acnt;
dst_cidx = cidx;
} else {
dev_err(dev, "%s: direction not implemented yet\n", __func__);
return -EINVAL;
@ -499,6 +504,44 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg(
return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
}
struct dma_async_tx_descriptor *edma_prep_dma_memcpy(
struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long tx_flags)
{
int ret;
struct edma_desc *edesc;
struct device *dev = chan->device->dev;
struct edma_chan *echan = to_edma_chan(chan);
if (unlikely(!echan || !len))
return NULL;
edesc = kzalloc(sizeof(*edesc) + sizeof(edesc->pset[0]), GFP_ATOMIC);
if (!edesc) {
dev_dbg(dev, "Failed to allocate a descriptor\n");
return NULL;
}
edesc->pset_nr = 1;
ret = edma_config_pset(chan, &edesc->pset[0], src, dest, 1,
DMA_SLAVE_BUSWIDTH_4_BYTES, len, DMA_MEM_TO_MEM);
if (ret < 0)
return NULL;
edesc->absync = ret;
/*
* Enable intermediate transfer chaining to re-trigger channel
* on completion of every TR, and enable transfer-completion
* interrupt on completion of the whole transfer.
*/
edesc->pset[0].opt |= ITCCHEN;
edesc->pset[0].opt |= TCINTEN;
return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
}
static struct dma_async_tx_descriptor *edma_prep_dma_cyclic(
struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction direction,
@ -877,6 +920,7 @@ static void edma_dma_init(struct edma_cc *ecc, struct dma_device *dma,
{
dma->device_prep_slave_sg = edma_prep_slave_sg;
dma->device_prep_dma_cyclic = edma_prep_dma_cyclic;
dma->device_prep_dma_memcpy = edma_prep_dma_memcpy;
dma->device_alloc_chan_resources = edma_alloc_chan_resources;
dma->device_free_chan_resources = edma_free_chan_resources;
dma->device_issue_pending = edma_issue_pending;
@ -885,6 +929,12 @@ static void edma_dma_init(struct edma_cc *ecc, struct dma_device *dma,
dma->device_slave_caps = edma_dma_device_slave_caps;
dma->dev = dev;
/*
* code using dma memcpy must make sure alignment of
* length is at dma->copy_align boundary.
*/
dma->copy_align = DMA_SLAVE_BUSWIDTH_4_BYTES;
INIT_LIST_HEAD(&dma->channels);
}
@ -913,6 +963,7 @@ static int edma_probe(struct platform_device *pdev)
dma_cap_zero(ecc->dma_slave.cap_mask);
dma_cap_set(DMA_SLAVE, ecc->dma_slave.cap_mask);
dma_cap_set(DMA_CYCLIC, ecc->dma_slave.cap_mask);
dma_cap_set(DMA_MEMCPY, ecc->dma_slave.cap_mask);
edma_dma_init(ecc, &ecc->dma_slave, &pdev->dev);