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    Subject[PATCH 7/8 resend] dw_dmac.c: Pass Channel Allocation Order from platform_data
    Date
    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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