Messages in this thread | | | Subject | Re: [PATCH 7/8 resend] dw_dmac.c: Pass Channel Allocation Order from platform_data | From | "Koul, Vinod" <> | Date | Thu, 03 Mar 2011 00:07:54 +0530 |
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On Mon, 2011-02-28 at 16:11 +0530, Viresh Kumar wrote: > 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 pass? > 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 */ Can you add these defines outside of this struct? > + unsigned int chan_allocation_order; > }; > > /**
-- ~Vinod
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