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dmaengine: at_hdmac: add wrappers for testing channel state

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Cyclic property and paused state are encoded as bits in the channel status
bitfield. Tests of those bits are wrapped in convenient helper functions.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Nicolas Ferre 2011-07-25 21:09:23 +00:00 committed by Vinod Koul
parent c0ba594737
commit 3c477482bb
2 changed files with 26 additions and 10 deletions
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19
drivers/dma/at_hdmac.c
View file

@ -301,7 +301,7 @@ atc_chain_complete(struct at_dma_chan *atchan, struct at_desc *desc)
/* for cyclic transfers,
* no need to replay callback function while stopping */
if (!test_bit(ATC_IS_CYCLIC, &atchan->status)) {
if (!atc_chan_is_cyclic(atchan)) {
dma_async_tx_callback callback = txd->callback;
void *param = txd->callback_param;
@ -478,7 +478,7 @@ static void atc_tasklet(unsigned long data)
spin_lock_irqsave(&atchan->lock, flags);
if (test_and_clear_bit(ATC_IS_ERROR, &atchan->status))
atc_handle_error(atchan);
else if (test_bit(ATC_IS_CYCLIC, &atchan->status))
else if (atc_chan_is_cyclic(atchan))
atc_handle_cyclic(atchan);
else
atc_advance_work(atchan);
@ -945,7 +945,7 @@ static int atc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
spin_unlock_irqrestore(&atchan->lock, flags);
} else if (cmd == DMA_RESUME) {
if (!test_bit(ATC_IS_PAUSED, &atchan->status))
if (!atc_chan_is_paused(atchan))
return 0;
spin_lock_irqsave(&atchan->lock, flags);
@ -1035,7 +1035,7 @@ atc_tx_status(struct dma_chan *chan,
else
dma_set_tx_state(txstate, last_complete, last_used, 0);
if (test_bit(ATC_IS_PAUSED, &atchan->status))
if (atc_chan_is_paused(atchan))
ret = DMA_PAUSED;
dev_vdbg(chan2dev(chan), "tx_status %d: cookie = %d (d%d, u%d)\n",
@ -1057,7 +1057,7 @@ static void atc_issue_pending(struct dma_chan *chan)
dev_vdbg(chan2dev(chan), "issue_pending\n");
/* Not needed for cyclic transfers */
if (test_bit(ATC_IS_CYCLIC, &atchan->status))
if (atc_chan_is_cyclic(atchan))
return;
spin_lock_irqsave(&atchan->lock, flags);
@ -1395,8 +1395,7 @@ static int at_dma_prepare(struct device *dev)
device_node) {
struct at_dma_chan *atchan = to_at_dma_chan(chan);
/* wait for transaction completion (except in cyclic case) */
if (atc_chan_is_enabled(atchan) &&
!test_bit(ATC_IS_CYCLIC, &atchan->status))
if (atc_chan_is_enabled(atchan) && !atc_chan_is_cyclic(atchan))
return -EAGAIN;
}
return 0;
@ -1408,7 +1407,7 @@ static void atc_suspend_cyclic(struct at_dma_chan *atchan)
/* Channel should be paused by user
* do it anyway even if it is not done already */
if (!test_bit(ATC_IS_PAUSED, &atchan->status)) {
if (!atc_chan_is_paused(atchan)) {
dev_warn(chan2dev(chan),
"cyclic channel not paused, should be done by channel user\n");
atc_control(chan, DMA_PAUSE, 0);
@ -1432,7 +1431,7 @@ static int at_dma_suspend_noirq(struct device *dev)
device_node) {
struct at_dma_chan *atchan = to_at_dma_chan(chan);
if (test_bit(ATC_IS_CYCLIC, &atchan->status))
if (atc_chan_is_cyclic(atchan))
atc_suspend_cyclic(atchan);
atchan->save_cfg = channel_readl(atchan, CFG);
}
@ -1484,7 +1483,7 @@ static int at_dma_resume_noirq(struct device *dev)
struct at_dma_chan *atchan = to_at_dma_chan(chan);
channel_writel(atchan, CFG, atchan->save_cfg);
if (test_bit(ATC_IS_CYCLIC, &atchan->status))
if (atc_chan_is_cyclic(atchan))
atc_resume_cyclic(atchan);
}
return 0;

17
drivers/dma/at_hdmac_regs.h
View file

@ -362,6 +362,23 @@ static inline int atc_chan_is_enabled(struct at_dma_chan *atchan)
return !!(dma_readl(atdma, CHSR) & atchan->mask);
}
/**
* atc_chan_is_paused - test channel pause/resume status
* @atchan: channel we want to test status
*/
static inline int atc_chan_is_paused(struct at_dma_chan *atchan)
{
return test_bit(ATC_IS_PAUSED, &atchan->status);
}
/**
* atc_chan_is_cyclic - test if given channel has cyclic property set
* @atchan: channel we want to test status
*/
static inline int atc_chan_is_cyclic(struct at_dma_chan *atchan)
{
return test_bit(ATC_IS_CYCLIC, &atchan->status);
}
/**
* set_desc_eol - set end-of-link to descriptor so it will end transfer