mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 15:43:59 +08:00
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:
parent
e6fad592b0
commit
8cc3e30bea
@ -379,6 +379,11 @@ static int edma_config_pset(struct dma_chan *chan, struct edmacc_param *pset,
|
|||||||
src_cidx = 0;
|
src_cidx = 0;
|
||||||
dst_bidx = acnt;
|
dst_bidx = acnt;
|
||||||
dst_cidx = cidx;
|
dst_cidx = cidx;
|
||||||
|
} else if (direction == DMA_MEM_TO_MEM) {
|
||||||
|
src_bidx = acnt;
|
||||||
|
src_cidx = cidx;
|
||||||
|
dst_bidx = acnt;
|
||||||
|
dst_cidx = cidx;
|
||||||
} else {
|
} else {
|
||||||
dev_err(dev, "%s: direction not implemented yet\n", __func__);
|
dev_err(dev, "%s: direction not implemented yet\n", __func__);
|
||||||
return -EINVAL;
|
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);
|
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(
|
static struct dma_async_tx_descriptor *edma_prep_dma_cyclic(
|
||||||
struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
|
struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
|
||||||
size_t period_len, enum dma_transfer_direction direction,
|
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_slave_sg = edma_prep_slave_sg;
|
||||||
dma->device_prep_dma_cyclic = edma_prep_dma_cyclic;
|
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_alloc_chan_resources = edma_alloc_chan_resources;
|
||||||
dma->device_free_chan_resources = edma_free_chan_resources;
|
dma->device_free_chan_resources = edma_free_chan_resources;
|
||||||
dma->device_issue_pending = edma_issue_pending;
|
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->device_slave_caps = edma_dma_device_slave_caps;
|
||||||
dma->dev = dev;
|
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);
|
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_zero(ecc->dma_slave.cap_mask);
|
||||||
dma_cap_set(DMA_SLAVE, 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_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);
|
edma_dma_init(ecc, &ecc->dma_slave, &pdev->dev);
|
||||||
|
|
||||||
|
Loading…
Reference in New Issue
Block a user