Commit 6007ccb5 authored by Maxime Ripard's avatar Maxime Ripard Committed by Vinod Koul

dmaengine: xdmac: Add interleaved transfer support

The XDMAC supports interleaved tranfers through its flexible descriptor
configuration.

Add support for that kind of transfers to the dmaengine driver.
Signed-off-by: default avatarMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 0d0ee751
...@@ -485,6 +485,19 @@ static void at_xdmac_queue_desc(struct dma_chan *chan, ...@@ -485,6 +485,19 @@ static void at_xdmac_queue_desc(struct dma_chan *chan,
__func__, prev, &prev->lld.mbr_nda); __func__, prev, &prev->lld.mbr_nda);
} }
static inline void at_xdmac_increment_block_count(struct dma_chan *chan,
struct at_xdmac_desc *desc)
{
if (!desc)
return;
desc->lld.mbr_bc++;
dev_dbg(chan2dev(chan),
"%s: incrementing the block count of the desc 0x%p\n",
__func__, desc);
}
static struct dma_chan *at_xdmac_xlate(struct of_phandle_args *dma_spec, static struct dma_chan *at_xdmac_xlate(struct of_phandle_args *dma_spec,
struct of_dma *of_dma) struct of_dma *of_dma)
{ {
...@@ -782,6 +795,224 @@ static inline u32 at_xdmac_align_width(struct dma_chan *chan, dma_addr_t addr) ...@@ -782,6 +795,224 @@ static inline u32 at_xdmac_align_width(struct dma_chan *chan, dma_addr_t addr)
return width; return width;
} }
static struct at_xdmac_desc *
at_xdmac_interleaved_queue_desc(struct dma_chan *chan,
struct at_xdmac_chan *atchan,
struct at_xdmac_desc *prev,
dma_addr_t src, dma_addr_t dst,
struct dma_interleaved_template *xt,
struct data_chunk *chunk)
{
struct at_xdmac_desc *desc;
u32 dwidth;
unsigned long flags;
size_t ublen;
/*
* WARNING: The channel configuration is set here since there is no
* dmaengine_slave_config call in this case. Moreover we don't know the
* direction, it involves we can't dynamically set the source and dest
* interface so we have to use the same one. Only interface 0 allows EBI
* access. Hopefully we can access DDR through both ports (at least on
* SAMA5D4x), so we can use the same interface for source and dest,
* that solves the fact we don't know the direction.
*/
u32 chan_cc = AT_XDMAC_CC_DIF(0)
| AT_XDMAC_CC_SIF(0)
| AT_XDMAC_CC_MBSIZE_SIXTEEN
| AT_XDMAC_CC_TYPE_MEM_TRAN;
dwidth = at_xdmac_align_width(chan, src | dst | chunk->size);
if (chunk->size >= (AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth)) {
dev_dbg(chan2dev(chan),
"%s: chunk too big (%d, max size %lu)...\n",
__func__, chunk->size,
AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth);
return NULL;
}
if (prev)
dev_dbg(chan2dev(chan),
"Adding items at the end of desc 0x%p\n", prev);
if (xt->src_inc) {
if (xt->src_sgl)
chan_cc |= AT_XDMAC_CC_SAM_UBS_DS_AM;
else
chan_cc |= AT_XDMAC_CC_SAM_INCREMENTED_AM;
}
if (xt->dst_inc) {
if (xt->dst_sgl)
chan_cc |= AT_XDMAC_CC_DAM_UBS_DS_AM;
else
chan_cc |= AT_XDMAC_CC_DAM_INCREMENTED_AM;
}
spin_lock_irqsave(&atchan->lock, flags);
desc = at_xdmac_get_desc(atchan);
spin_unlock_irqrestore(&atchan->lock, flags);
if (!desc) {
dev_err(chan2dev(chan), "can't get descriptor\n");
return NULL;
}
chan_cc |= AT_XDMAC_CC_DWIDTH(dwidth);
ublen = chunk->size >> dwidth;
desc->lld.mbr_sa = src;
desc->lld.mbr_da = dst;
if (xt->src_inc && xt->src_sgl) {
if (chunk->src_icg)
desc->lld.mbr_sus = chunk->src_icg;
else
desc->lld.mbr_sus = chunk->icg;
}
if (xt->dst_inc && xt->dst_sgl) {
if (chunk->dst_icg)
desc->lld.mbr_dus = chunk->dst_icg;
else
desc->lld.mbr_dus = chunk->icg;
}
desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV3
| AT_XDMAC_MBR_UBC_NDEN
| AT_XDMAC_MBR_UBC_NSEN
| ublen;
desc->lld.mbr_cfg = chan_cc;
dev_dbg(chan2dev(chan),
"%s: lld: mbr_sa=0x%08x, mbr_da=0x%08x, mbr_ubc=0x%08x, mbr_cfg=0x%08x\n",
__func__, desc->lld.mbr_sa, desc->lld.mbr_da,
desc->lld.mbr_ubc, desc->lld.mbr_cfg);
/* Chain lld. */
if (prev)
at_xdmac_queue_desc(chan, prev, desc);
return desc;
}
static size_t at_xdmac_get_icg(bool inc, bool sgl, size_t icg, size_t dir_icg)
{
if (inc) {
if (dir_icg)
return dir_icg;
else if (sgl)
return icg;
}
return 0;
}
static size_t at_xdmac_get_dst_icg(struct dma_interleaved_template *xt,
struct data_chunk *chunk)
{
return at_xdmac_get_icg(xt->dst_inc, xt->dst_sgl,
chunk->icg, chunk->dst_icg);
}
static size_t at_xdmac_get_src_icg(struct dma_interleaved_template *xt,
struct data_chunk *chunk)
{
return at_xdmac_get_icg(xt->src_inc, xt->src_sgl,
chunk->icg, chunk->src_icg);
}
static struct dma_async_tx_descriptor *
at_xdmac_prep_interleaved(struct dma_chan *chan,
struct dma_interleaved_template *xt,
unsigned long flags)
{
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
struct at_xdmac_desc *prev = NULL, *first = NULL;
struct data_chunk *chunk, *prev_chunk = NULL;
dma_addr_t dst_addr, src_addr;
size_t dst_skip, src_skip, len = 0;
size_t prev_dst_icg = 0, prev_src_icg = 0;
int i;
if (!xt || (xt->numf != 1) || (xt->dir != DMA_MEM_TO_MEM))
return NULL;
dev_dbg(chan2dev(chan), "%s: src=0x%08x, dest=0x%08x, numf=%d, frame_size=%d, flags=0x%lx\n",
__func__, xt->src_start, xt->dst_start, xt->numf,
xt->frame_size, flags);
src_addr = xt->src_start;
dst_addr = xt->dst_start;
for (i = 0; i < xt->frame_size; i++) {
struct at_xdmac_desc *desc;
size_t src_icg, dst_icg;
chunk = xt->sgl + i;
dst_icg = at_xdmac_get_dst_icg(xt, chunk);
src_icg = at_xdmac_get_src_icg(xt, chunk);
src_skip = chunk->size + src_icg;
dst_skip = chunk->size + dst_icg;
dev_dbg(chan2dev(chan),
"%s: chunk size=%d, src icg=%d, dst icg=%d\n",
__func__, chunk->size, src_icg, dst_icg);
/*
* Handle the case where we just have the same
* transfer to setup, we can just increase the
* block number and reuse the same descriptor.
*/
if (prev_chunk && prev &&
(prev_chunk->size == chunk->size) &&
(prev_src_icg == src_icg) &&
(prev_dst_icg == dst_icg)) {
dev_dbg(chan2dev(chan),
"%s: same configuration that the previous chunk, merging the descriptors...\n",
__func__);
at_xdmac_increment_block_count(chan, prev);
continue;
}
desc = at_xdmac_interleaved_queue_desc(chan, atchan,
prev,
src_addr, dst_addr,
xt, chunk);
if (!desc) {
list_splice_init(&first->descs_list,
&atchan->free_descs_list);
return NULL;
}
if (!first)
first = desc;
dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n",
__func__, desc, first);
list_add_tail(&desc->desc_node, &first->descs_list);
if (xt->src_sgl)
src_addr += src_skip;
if (xt->dst_sgl)
dst_addr += dst_skip;
len += chunk->size;
prev_chunk = chunk;
prev_dst_icg = dst_icg;
prev_src_icg = src_icg;
prev = desc;
}
first->tx_dma_desc.cookie = -EBUSY;
first->tx_dma_desc.flags = flags;
first->xfer_size = len;
return &first->tx_dma_desc;
}
static struct dma_async_tx_descriptor * static struct dma_async_tx_descriptor *
at_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, at_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags) size_t len, unsigned long flags)
...@@ -1404,6 +1635,7 @@ static int at_xdmac_probe(struct platform_device *pdev) ...@@ -1404,6 +1635,7 @@ static int at_xdmac_probe(struct platform_device *pdev)
} }
dma_cap_set(DMA_CYCLIC, atxdmac->dma.cap_mask); dma_cap_set(DMA_CYCLIC, atxdmac->dma.cap_mask);
dma_cap_set(DMA_INTERLEAVE, atxdmac->dma.cap_mask);
dma_cap_set(DMA_MEMCPY, atxdmac->dma.cap_mask); dma_cap_set(DMA_MEMCPY, atxdmac->dma.cap_mask);
dma_cap_set(DMA_SLAVE, atxdmac->dma.cap_mask); dma_cap_set(DMA_SLAVE, atxdmac->dma.cap_mask);
/* /*
...@@ -1417,6 +1649,7 @@ static int at_xdmac_probe(struct platform_device *pdev) ...@@ -1417,6 +1649,7 @@ static int at_xdmac_probe(struct platform_device *pdev)
atxdmac->dma.device_tx_status = at_xdmac_tx_status; atxdmac->dma.device_tx_status = at_xdmac_tx_status;
atxdmac->dma.device_issue_pending = at_xdmac_issue_pending; atxdmac->dma.device_issue_pending = at_xdmac_issue_pending;
atxdmac->dma.device_prep_dma_cyclic = at_xdmac_prep_dma_cyclic; atxdmac->dma.device_prep_dma_cyclic = at_xdmac_prep_dma_cyclic;
atxdmac->dma.device_prep_interleaved_dma = at_xdmac_prep_interleaved;
atxdmac->dma.device_prep_dma_memcpy = at_xdmac_prep_dma_memcpy; atxdmac->dma.device_prep_dma_memcpy = at_xdmac_prep_dma_memcpy;
atxdmac->dma.device_prep_slave_sg = at_xdmac_prep_slave_sg; atxdmac->dma.device_prep_slave_sg = at_xdmac_prep_slave_sg;
atxdmac->dma.device_config = at_xdmac_device_config; atxdmac->dma.device_config = at_xdmac_device_config;
......
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