From 3c477482bb9f976e5451c50be7d3d60ea6f88646 Mon Sep 17 00:00:00 2001 From: Nicolas Ferre Date: Mon, 25 Jul 2011 21:09:23 +0000 Subject: [PATCH] dmaengine: at_hdmac: add wrappers for testing channel state 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 Signed-off-by: Vinod Koul --- drivers/dma/at_hdmac.c | 19 +++++++++---------- drivers/dma/at_hdmac_regs.h | 17 +++++++++++++++++ 2 files changed, 26 insertions(+), 10 deletions(-) diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c index 0ead008e3bd..d774800b9fa 100644 --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -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; diff --git a/drivers/dma/at_hdmac_regs.h b/drivers/dma/at_hdmac_regs.h index 6f0c4a3eb09..aa4c9aebab7 100644 --- a/drivers/dma/at_hdmac_regs.h +++ b/drivers/dma/at_hdmac_regs.h @@ -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 -- 2.11.4.GIT