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authorLinus Walleij <linus.walleij@stericsson.com>2010-03-26 16:50:49 -0700
committerDan Williams <dan.j.williams@intel.com>2010-03-26 16:50:49 -0700
commit0793448187643b50af89d36b08470baf45a3cab4 (patch)
treeb3313ff58d47e26a8cf707d196177effa1aadfbe /drivers/dma/at_hdmac.c
parentc3635c78e500a52c9fcd55de381a72928d9e054d (diff)
downloadop-kernel-dev-0793448187643b50af89d36b08470baf45a3cab4.zip
op-kernel-dev-0793448187643b50af89d36b08470baf45a3cab4.tar.gz
DMAENGINE: generic channel status v2
Convert the device_is_tx_complete() operation on the DMA engine to a generic device_tx_status()operation which can return three states, DMA_TX_RUNNING, DMA_TX_COMPLETE, DMA_TX_PAUSED. [dan.j.williams@intel.com: update for timberdale] Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Cc: Maciej Sosnowski <maciej.sosnowski@intel.com> Cc: Nicolas Ferre <nicolas.ferre@atmel.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: Li Yang <leoli@freescale.com> Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> Cc: Magnus Damm <damm@opensource.se> Cc: Liam Girdwood <lrg@slimlogic.co.uk> Cc: Joe Perches <joe@perches.com> Cc: Roland Dreier <rdreier@cisco.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma/at_hdmac.c')
-rw-r--r--drivers/dma/at_hdmac.c29
1 files changed, 15 insertions, 14 deletions
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index f9143cf..ff75cf1 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -798,29 +798,25 @@ static int atc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd)
}
/**
- * atc_is_tx_complete - poll for transaction completion
+ * atc_tx_status - poll for transaction completion
* @chan: DMA channel
* @cookie: transaction identifier to check status of
- * @done: if not %NULL, updated with last completed transaction
- * @used: if not %NULL, updated with last used transaction
+ * @txstate: if not %NULL updated with transaction state
*
- * If @done and @used are passed in, upon return they reflect the driver
+ * If @txstate is passed in, upon return it reflect the driver
* internal state and can be used with dma_async_is_complete() to check
* the status of multiple cookies without re-checking hardware state.
*/
static enum dma_status
-atc_is_tx_complete(struct dma_chan *chan,
+atc_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
- dma_cookie_t *done, dma_cookie_t *used)
+ struct dma_tx_state *txstate)
{
struct at_dma_chan *atchan = to_at_dma_chan(chan);
dma_cookie_t last_used;
dma_cookie_t last_complete;
enum dma_status ret;
- dev_vdbg(chan2dev(chan), "is_tx_complete: %d (d%d, u%d)\n",
- cookie, done ? *done : 0, used ? *used : 0);
-
spin_lock_bh(&atchan->lock);
last_complete = atchan->completed_cookie;
@@ -838,10 +834,15 @@ atc_is_tx_complete(struct dma_chan *chan,
spin_unlock_bh(&atchan->lock);
- if (done)
- *done = last_complete;
- if (used)
- *used = last_used;
+ if (txstate) {
+ txstate->last = last_complete;
+ txstate->used = last_used;
+ txstate->residue = 0;
+ }
+
+ dev_vdbg(chan2dev(chan), "tx_status: %d (d%d, u%d)\n",
+ cookie, last_complete ? last_complete : 0,
+ last_used ? last_used : 0);
return ret;
}
@@ -1087,7 +1088,7 @@ static int __init at_dma_probe(struct platform_device *pdev)
/* set base routines */
atdma->dma_common.device_alloc_chan_resources = atc_alloc_chan_resources;
atdma->dma_common.device_free_chan_resources = atc_free_chan_resources;
- atdma->dma_common.device_is_tx_complete = atc_is_tx_complete;
+ atdma->dma_common.device_tx_status = atc_tx_status;
atdma->dma_common.device_issue_pending = atc_issue_pending;
atdma->dma_common.dev = &pdev->dev;
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