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dw_dmac: Pass Channel Allocation Order from platform_data 

In SPEAr Platform channels 4-7 have more Fifo depth. So we must get better
channel first. This patch introduces concept of channel allocation order in
dw_dmac. If user doesn't pass anything or 0, than normal (ascending) channel
allocation will follow, else channels will be allocated in descending order.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
hifive-unleashed-5.1
Viresh Kumar 2011-03-03 15:47:21 +05:30 committed by Vinod Koul
parent e518076ef8
commit b0c3130d69
2 changed files with 8 additions and 1 deletions
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6
drivers/dma/dw_dmac.c
View File

@ -1319,7 +1319,11 @@ static int __init dw_probe(struct platform_device *pdev)
dwc->chan.device = &dw->dma;
dwc->chan.cookie = dwc->completed = 1;
dwc->chan.chan_id = i;
list_add_tail(&dwc->chan.device_node, &dw->dma.channels);
if (pdata->chan_allocation_order == CHAN_ALLOCATION_ASCENDING)
list_add_tail(&dwc->chan.device_node,
&dw->dma.channels);
else
list_add(&dwc->chan.device_node, &dw->dma.channels);
dwc->ch_regs = &__dw_regs(dw)->CHAN[i];
spin_lock_init(&dwc->lock);

3
include/linux/dw_dmac.h
View File

@ -22,6 +22,9 @@
struct dw_dma_platform_data {
unsigned int nr_channels;
bool is_private;
#define CHAN_ALLOCATION_ASCENDING 0 /* zero to seven */
#define CHAN_ALLOCATION_DESCENDING 1 /* seven to zero */
unsigned char chan_allocation_order;
};
/**