Messages in this thread Patch in this message | | | From | Viresh Kumar <> | Subject | [PATCH 7/8 resend] dw_dmac.c: Pass Channel Allocation Order from platform_data | Date | Mon, 28 Feb 2011 16:11:22 +0530 |
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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 paas 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> --- drivers/dma/dw_dmac.c | 6 +++++- include/linux/dw_dmac.h | 3 +++ 2 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c index 01f783d..37ffd2c 100644 --- a/drivers/dma/dw_dmac.c +++ b/drivers/dma/dw_dmac.c @@ -1314,7 +1314,11 @@ 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); diff --git a/include/linux/dw_dmac.h b/include/linux/dw_dmac.h index c8aad71..057e883 100644 --- a/include/linux/dw_dmac.h +++ b/include/linux/dw_dmac.h @@ -19,6 +19,9 @@ */ struct dw_dma_platform_data { unsigned int nr_channels; +#define CHAN_ALLOCATION_ASCENDING 0 /* zero to seven */ +#define CHAN_ALLOCATION_DESCENDING 1 /* seven to zero */ + unsigned int chan_allocation_order; }; /** -- 1.7.2.2
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