diff options
| author | Viresh Kumar <viresh.kumar@st.com> | 2011-03-03 11:17:22 +0100 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2011-03-06 20:42:28 +0100 |
| commit | 93317e8e35b77633d589fe0e132291195757d785 (patch) | |
| tree | c3419c1a02e3952506ca0af281f9f9c5bc52888d /drivers/dma/dw_dmac.c | |
| parent | dw_dmac: Pass Channel Allocation Order from platform_data (diff) | |
| download | linux-93317e8e35b77633d589fe0e132291195757d785.tar.xz linux-93317e8e35b77633d589fe0e132291195757d785.zip | |
dw_dmac: Pass Channel Priority from platform_data
In Synopsys designware, channel priority is programmable. This patch adds
support for passing channel priority through platform data. By default Ascending
channel priority will be followed, i.e. channel 0 will get highest priority and
channel 7 will get lowest.
Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/dw_dmac.c')
| -rw-r--r-- | drivers/dma/dw_dmac.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c index f413e123405a..318a342fc7ec 100644 --- a/drivers/dma/dw_dmac.c +++ b/drivers/dma/dw_dmac.c @@ -901,8 +901,11 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan) BUG_ON(!dws->dma_dev || dws->dma_dev != dw->dma.dev); cfghi = dws->cfg_hi; - cfglo = dws->cfg_lo; + cfglo = dws->cfg_lo & ~DWC_CFGL_CH_PRIOR_MASK; } + + cfglo |= DWC_CFGL_CH_PRIOR(dwc->priority); + channel_writel(dwc, CFG_LO, cfglo); channel_writel(dwc, CFG_HI, cfghi); @@ -1325,6 +1328,12 @@ static int __init dw_probe(struct platform_device *pdev) else list_add(&dwc->chan.device_node, &dw->dma.channels); + /* 7 is highest priority & 0 is lowest. */ + if (pdata->chan_priority == CHAN_PRIORITY_ASCENDING) + dwc->priority = 7 - i; + else + dwc->priority = i; + dwc->ch_regs = &__dw_regs(dw)->CHAN[i]; spin_lock_init(&dwc->lock); dwc->mask = 1 << i; |