From a5ebca4769f28ceade28ff59fcbffb8e184e599c Mon Sep 17 00:00:00 2001 From: Jonas Aaberg Date: Tue, 18 May 2010 00:41:09 +0200 Subject: DMAENGINE: DMA40 support paused channel status Support determining whether a channel is paused or not using the status function. Signed-off-by: Jonas Aaberg Signed-off-by: Linus Walleij Signed-off-by: Dan Williams --- drivers/dma/ste_dma40.c | 75 +++++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 67 insertions(+), 8 deletions(-) diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c index e4295a2..16a7d2b 100644 --- a/drivers/dma/ste_dma40.c +++ b/drivers/dma/ste_dma40.c @@ -659,7 +659,7 @@ static void d40_config_set_event(struct d40_chan *d40c, bool do_enable) spin_unlock_irqrestore(&d40c->phy_chan->lock, flags); } -static bool d40_chan_has_events(struct d40_chan *d40c) +static u32 d40_chan_has_events(struct d40_chan *d40c) { u32 val = 0; @@ -674,7 +674,7 @@ static bool d40_chan_has_events(struct d40_chan *d40c) val = readl(d40c->base->virtbase + D40_DREG_PCBASE + d40c->phy_chan->num * D40_DREG_PCDELTA + D40_CHAN_REG_SDLNK); - return (bool) val; + return val; } static void d40_config_enable_lidx(struct d40_chan *d40c) @@ -1389,6 +1389,65 @@ static int d40_pause(struct dma_chan *chan) return res; } +static bool d40_is_paused(struct d40_chan *d40c) +{ + bool is_paused = false; + unsigned long flags; + void __iomem *active_reg; + u32 status; + u32 event; + int res; + + spin_lock_irqsave(&d40c->lock, flags); + + if (d40c->log_num == D40_PHY_CHAN) { + if (d40c->phy_chan->num % 2 == 0) + active_reg = d40c->base->virtbase + D40_DREG_ACTIVE; + else + active_reg = d40c->base->virtbase + D40_DREG_ACTIVO; + + status = (readl(active_reg) & + D40_CHAN_POS_MASK(d40c->phy_chan->num)) >> + D40_CHAN_POS(d40c->phy_chan->num); + if (status == D40_DMA_SUSPENDED || status == D40_DMA_STOP) + is_paused = true; + + goto _exit; + } + + res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ); + if (res != 0) + goto _exit; + + if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH || + d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) + event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dst_dev_type); + else if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) + event = D40_TYPE_TO_EVENT(d40c->dma_cfg.src_dev_type); + else { + dev_err(&d40c->chan.dev->device, + "[%s] Unknown direction\n", __func__); + goto _exit; + } + status = d40_chan_has_events(d40c); + status = (status & D40_EVENTLINE_MASK(event)) >> + D40_EVENTLINE_POS(event); + + if (status != D40_DMA_RUN) + is_paused = true; + + /* Resume the other logical channels if any */ + if (d40_chan_has_events(d40c)) + res = d40_channel_execute_command(d40c, + D40_DMA_RUN); + +_exit: + spin_unlock_irqrestore(&d40c->lock, flags); + return is_paused; + +} + + static bool d40_tx_is_linked(struct d40_chan *d40c) { bool is_link; @@ -1980,13 +2039,13 @@ static enum dma_status d40_tx_status(struct dma_chan *chan, last_complete = d40c->completed; last_used = chan->cookie; - ret = dma_async_is_complete(cookie, last_complete, last_used); + if (d40_is_paused(d40c)) + ret = DMA_PAUSED; + else + ret = dma_async_is_complete(cookie, last_complete, last_used); - if (txstate) { - txstate->last = last_complete; - txstate->used = last_used; - txstate->residue = stedma40_residue(chan); - } + dma_set_tx_state(txstate, last_complete, last_used, + stedma40_residue(chan)); return ret; } -- cgit v1.1