lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

dw_dmac: Pass Channel Allocation Order from platform_data

Browse Source 
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>
This commit is contained in:
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
Download Patch File Download Diff File Expand all files Collapse all files

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.device = &dw->dma;
dwc->chan.cookie = dwc->completed = 1; dwc->chan.cookie = dwc->completed = 1;
dwc->chan.chan_id = i; 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]; dwc->ch_regs = &__dw_regs(dw)->CHAN[i];
spin_lock_init(&dwc->lock); spin_lock_init(&dwc->lock);

3
include/linux/dw_dmac.h
View File

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