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DMA: shdma: add cyclic transfer support 

This patch add cyclic transfer support and enables dmaengine_prep_dma_cyclic()

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
[reflown changelog for readablity]
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Kuninori Morimoto 2014-04-02 20:17:00 -07:00 committed by Vinod Koul
parent 91ea74e9ec
commit dfbb85cab5
2 changed files with 66 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

72
drivers/dma/sh/shdma-base.c
View File

@ -304,6 +304,7 @@ static dma_async_tx_callback __ld_cleanup(struct shdma_chan *schan, bool all)
dma_async_tx_callback callback = NULL;
void *param = NULL;
unsigned long flags;
LIST_HEAD(cyclic_list);
spin_lock_irqsave(&schan->chan_lock, flags);
list_for_each_entry_safe(desc, _desc, &schan->ld_queue, node) {
@ -369,10 +370,16 @@ static dma_async_tx_callback __ld_cleanup(struct shdma_chan *schan, bool all)
if (((desc->mark == DESC_COMPLETED ||
desc->mark == DESC_WAITING) &&
async_tx_test_ack(&desc->async_tx)) || all) {
/* Remove from ld_queue list */
desc->mark = DESC_IDLE;
list_move(&desc->node, &schan->ld_free);
if (all || !desc->cyclic) {
/* Remove from ld_queue list */
desc->mark = DESC_IDLE;
list_move(&desc->node, &schan->ld_free);
} else {
/* reuse as cyclic */
desc->mark = DESC_SUBMITTED;
list_move_tail(&desc->node, &cyclic_list);
}
if (list_empty(&schan->ld_queue)) {
dev_dbg(schan->dev, "Bring down channel %d\n", schan->id);
@ -389,6 +396,8 @@ static dma_async_tx_callback __ld_cleanup(struct shdma_chan *schan, bool all)
*/
schan->dma_chan.completed_cookie = schan->dma_chan.cookie;
list_splice_tail(&cyclic_list, &schan->ld_queue);
spin_unlock_irqrestore(&schan->chan_lock, flags);
if (callback)
@ -521,7 +530,7 @@ static struct shdma_desc *shdma_add_desc(struct shdma_chan *schan,
*/
static struct dma_async_tx_descriptor *shdma_prep_sg(struct shdma_chan *schan,
struct scatterlist *sgl, unsigned int sg_len, dma_addr_t *addr,
enum dma_transfer_direction direction, unsigned long flags)
enum dma_transfer_direction direction, unsigned long flags, bool cyclic)
{
struct scatterlist *sg;
struct shdma_desc *first = NULL, *new = NULL /* compiler... */;
@ -569,7 +578,11 @@ static struct dma_async_tx_descriptor *shdma_prep_sg(struct shdma_chan *schan,
if (!new)
goto err_get_desc;
new->chunks = chunks--;
new->cyclic = cyclic;
if (cyclic)
new->chunks = 1;
else
new->chunks = chunks--;
list_add_tail(&new->node, &tx_list);
} while (len);
}
@ -612,7 +625,8 @@ static struct dma_async_tx_descriptor *shdma_prep_memcpy(
sg_dma_address(&sg) = dma_src;
sg_dma_len(&sg) = len;
return shdma_prep_sg(schan, &sg, 1, &dma_dest, DMA_MEM_TO_MEM, flags);
return shdma_prep_sg(schan, &sg, 1, &dma_dest, DMA_MEM_TO_MEM,
flags, false);
}
static struct dma_async_tx_descriptor *shdma_prep_slave_sg(
@ -640,7 +654,50 @@ static struct dma_async_tx_descriptor *shdma_prep_slave_sg(
slave_addr = ops->slave_addr(schan);
return shdma_prep_sg(schan, sgl, sg_len, &slave_addr,
direction, flags);
direction, flags, false);
}
struct dma_async_tx_descriptor *shdma_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,
unsigned long flags, void *context)
{
struct shdma_chan *schan = to_shdma_chan(chan);
struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device);
const struct shdma_ops *ops = sdev->ops;
unsigned int sg_len = buf_len / period_len;
int slave_id = schan->slave_id;
dma_addr_t slave_addr;
struct scatterlist sgl[sg_len];
int i;
if (!chan)
return NULL;
BUG_ON(!schan->desc_num);
/* Someone calling slave DMA on a generic channel? */
if (slave_id < 0 || (buf_len < period_len)) {
dev_warn(schan->dev,
"%s: bad parameter: buf_len=%d, period_len=%d, id=%d\n",
__func__, buf_len, period_len, slave_id);
return NULL;
}
slave_addr = ops->slave_addr(schan);
sg_init_table(sgl, sg_len);
for (i = 0; i < sg_len; i++) {
dma_addr_t src = buf_addr + (period_len * i);
sg_set_page(&sgl[i], pfn_to_page(PFN_DOWN(src)), period_len,
offset_in_page(src));
sg_dma_address(&sgl[i]) = src;
sg_dma_len(&sgl[i]) = period_len;
}
return shdma_prep_sg(schan, sgl, sg_len, &slave_addr,
direction, flags, true);
}
static int shdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
@ -915,6 +972,7 @@ int shdma_init(struct device *dev, struct shdma_dev *sdev,
/* Compulsory for DMA_SLAVE fields */
dma_dev->device_prep_slave_sg = shdma_prep_slave_sg;
dma_dev->device_prep_dma_cyclic = shdma_prep_dma_cyclic;
dma_dev->device_control = shdma_control;
dma_dev->dev = dev;

1
include/linux/shdma-base.h
View File

@ -54,6 +54,7 @@ struct shdma_desc {
dma_cookie_t cookie;
int chunks;
int mark;
bool cyclic; /* used as cyclic transfer */
};
struct shdma_chan {