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dmaengine: xdmac: Add memset support 

The XDMAC supports memset transfers, both over contiguous areas, and over
discontiguous areas through a LLI.

The current memset operation only supports contiguous memset for now, add some
support for it. Scatter-gathered memset will come eventually.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Maxime Ripard 2015-05-18 13:46:16 +02:00 committed by Vinod Koul
parent f2704052cb
commit b206d9a23a
1 changed files with 89 additions and 0 deletions
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89
drivers/dma/at_xdmac.c
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@ -1073,6 +1073,93 @@ at_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
return &first->tx_dma_desc;
}
static struct at_xdmac_desc *at_xdmac_memset_create_desc(struct dma_chan *chan,
struct at_xdmac_chan *atchan,
dma_addr_t dst_addr,
size_t len,
int value)
{
struct at_xdmac_desc *desc;
unsigned long flags;
size_t ublen;
u32 dwidth;
/*
* 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_DAM_INCREMENTED_AM
| AT_XDMAC_CC_SAM_INCREMENTED_AM
| AT_XDMAC_CC_DIF(0)
| AT_XDMAC_CC_SIF(0)
| AT_XDMAC_CC_MBSIZE_SIXTEEN
| AT_XDMAC_CC_MEMSET_HW_MODE
| AT_XDMAC_CC_TYPE_MEM_TRAN;
dwidth = at_xdmac_align_width(chan, dst_addr);
if (len >= (AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth)) {
dev_err(chan2dev(chan),
"%s: Transfer too large, aborting...\n",
__func__);
return NULL;
}
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 = len >> dwidth;
desc->lld.mbr_da = dst_addr;
desc->lld.mbr_ds = value;
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_da=0x%08x, mbr_ds=0x%08x, mbr_ubc=0x%08x, mbr_cfg=0x%08x\n",
__func__, desc->lld.mbr_da, desc->lld.mbr_ds, desc->lld.mbr_ubc,
desc->lld.mbr_cfg);
return desc;
}
struct dma_async_tx_descriptor *
at_xdmac_prep_dma_memset(struct dma_chan *chan, dma_addr_t dest, int value,
size_t len, unsigned long flags)
{
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
struct at_xdmac_desc *desc;
dev_dbg(chan2dev(chan), "%s: dest=0x%08x, len=%d, pattern=0x%x, flags=0x%lx\n",
__func__, dest, len, value, flags);
if (unlikely(!len))
return NULL;
desc = at_xdmac_memset_create_desc(chan, atchan, dest, len, value);
list_add_tail(&desc->desc_node, &desc->descs_list);
desc->tx_dma_desc.cookie = -EBUSY;
desc->tx_dma_desc.flags = flags;
desc->xfer_size = len;
return &desc->tx_dma_desc;
}
static enum dma_status
at_xdmac_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
struct dma_tx_state *txstate)
@ -1599,6 +1686,7 @@ static int at_xdmac_probe(struct platform_device *pdev)
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_MEMSET, atxdmac->dma.cap_mask);
dma_cap_set(DMA_SLAVE, atxdmac->dma.cap_mask);
/*
* Without DMA_PRIVATE the driver is not able to allocate more than
@ -1613,6 +1701,7 @@ static int at_xdmac_probe(struct platform_device *pdev)
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_memset = at_xdmac_prep_dma_memset;
atxdmac->dma.device_prep_slave_sg = at_xdmac_prep_slave_sg;
atxdmac->dma.device_config = at_xdmac_device_config;
atxdmac->dma.device_pause = at_xdmac_device_pause;