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dmaengine: bcm2835: add dma_memcopy support to bcm2835-dma 

Also added check for an error condition in bcm2835_dma_create_cb_chain
that showed up during development of this patch.

Tested using dmatest for all enabled channels.

Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Martin Sperl 2016-03-16 12:25:02 -07:00 committed by Vinod Koul
parent 388cc7a281
commit d9f094a02f
1 changed files with 35 additions and 1 deletions
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36
drivers/dma/bcm2835-dma.c
View File

@ -310,6 +310,9 @@ static struct bcm2835_desc *bcm2835_dma_create_cb_chain(
struct bcm2835_cb_entry *cb_entry;
struct bcm2835_dma_cb *control_block;
if (!frames)
return NULL;
/* allocate and setup the descriptor. */
d = kzalloc(sizeof(*d) + frames * sizeof(struct bcm2835_cb_entry),
gfp);
@ -597,6 +600,34 @@ static void bcm2835_dma_issue_pending(struct dma_chan *chan)
spin_unlock_irqrestore(&c->vc.lock, flags);
}
struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_memcpy(
struct dma_chan *chan, dma_addr_t dst, dma_addr_t src,
size_t len, unsigned long flags)
{
struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
struct bcm2835_desc *d;
u32 info = BCM2835_DMA_D_INC | BCM2835_DMA_S_INC;
u32 extra = BCM2835_DMA_INT_EN | BCM2835_DMA_WAIT_RESP;
size_t max_len = bcm2835_dma_max_frame_length(c);
size_t frames;
/* if src, dst or len is not given return with an error */
if (!src || !dst || !len)
return NULL;
/* calculate number of frames */
frames = bcm2835_dma_frames_for_length(len, max_len);
/* allocate the CB chain - this also fills in the pointers */
d = bcm2835_dma_create_cb_chain(chan, DMA_MEM_TO_MEM, false,
info, extra, frames,
src, dst, len, 0, GFP_KERNEL);
if (!d)
return NULL;
return vchan_tx_prep(&c->vc, &d->vd, flags);
}
static struct dma_async_tx_descriptor *bcm2835_dma_prep_slave_sg(
struct dma_chan *chan,
struct scatterlist *sgl, unsigned int sg_len,
@ -880,17 +911,20 @@ static int bcm2835_dma_probe(struct platform_device *pdev)
dma_cap_set(DMA_PRIVATE, od->ddev.cap_mask);
dma_cap_set(DMA_CYCLIC, od->ddev.cap_mask);
dma_cap_set(DMA_SLAVE, od->ddev.cap_mask);
dma_cap_set(DMA_MEMCPY, od->ddev.cap_mask);
od->ddev.device_alloc_chan_resources = bcm2835_dma_alloc_chan_resources;
od->ddev.device_free_chan_resources = bcm2835_dma_free_chan_resources;
od->ddev.device_tx_status = bcm2835_dma_tx_status;
od->ddev.device_issue_pending = bcm2835_dma_issue_pending;
od->ddev.device_prep_dma_cyclic = bcm2835_dma_prep_dma_cyclic;
od->ddev.device_prep_slave_sg = bcm2835_dma_prep_slave_sg;
od->ddev.device_prep_dma_memcpy = bcm2835_dma_prep_dma_memcpy;
od->ddev.device_config = bcm2835_dma_slave_config;
od->ddev.device_terminate_all = bcm2835_dma_terminate_all;
od->ddev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
od->ddev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
od->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
od->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) |
BIT(DMA_MEM_TO_MEM);
od->ddev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
od->ddev.dev = &pdev->dev;
INIT_LIST_HEAD(&od->ddev.channels);