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DMAENGINE: DMA40 support paused channel status 

Support determining whether a channel is paused or
not using the status function.

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Jonas Aaberg 2010-05-18 00:41:09 +02:00 committed by Dan Williams
parent 8381fc3524
commit a5ebca4769
1 changed files with 67 additions and 8 deletions
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75
drivers/dma/ste_dma40.c
View File

@ -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;
}