Troy Kisky <troy.ki...@boundarydevices.com> writes:
> Reserve channels 0,1,12,13 and
> slots 78-109 for dsp use on dm644x.
>
> Signed-off-by: Troy Kisky <troy.ki...@boundarydevices.com>
>
> I've only verified that channels 0, and 78-101 need
> reserved, but reserving a little extra seems like
> a good idea.
I'm not crazy about this hard-coded reservation.
The DSP code has a kernel-side driver (dsplinkk.) That driver
should be doing the channel reservations.
Kevin
> arch/arm/mach-davinci/dm644x.c | 6 ++++++
> arch/arm/mach-davinci/dma.c | 8 ++++++++
> arch/arm/mach-davinci/include/mach/edma.h | 7 ++++++-
> 3 files changed, 20 insertions(+), 1 deletions(-)
>
> diff --git a/arch/arm/mach-davinci/dm644x.c b/arch/arm/mach-davinci/dm644x.c
> index 6a08568..86eb9ef 100644
> --- a/arch/arm/mach-davinci/dm644x.c
> +++ b/arch/arm/mach-davinci/dm644x.c
> @@ -403,6 +403,12 @@ static struct edma_soc_info dm644x_edma_info = {
> .n_slot = 128,
> .n_tc = 2,
> .noevent = dma_chan_dm644x_no_event,
> +/* reserve slots 78-109 for dsp use */
> + .dsp_reserve_slot_min = 78,
> + .dsp_reserve_slot_max = 78 + 31,
> +/* reserve channels 0, 1, 12, 13 for dsp use */
> + .dsp_reserve_channel_min = 0,
> + .dsp_reserve_channel_max = 13,
> };
>
> static struct resource edma_resources[] = {
> diff --git a/arch/arm/mach-davinci/dma.c b/arch/arm/mach-davinci/dma.c
> index 1f58631..f2e6b8a 100644
> --- a/arch/arm/mach-davinci/dma.c
> +++ b/arch/arm/mach-davinci/dma.c
> @@ -1051,6 +1051,14 @@ static int __init edma_probe(struct platform_device
> *pdev)
> while (*noevent != -1)
> set_bit(*noevent++, edma_noevent);
> }
> + for (i = info->dsp_reserve_slot_min;
> + i <= info->dsp_reserve_slot_max; i++)
> + set_bit(i, edma_inuse);
> +
> + for (i = info->dsp_reserve_channel_min;
> + i <= info->dsp_reserve_channel_max; i++)
> + if (test_bit(i, edma_noevent))
> + set_bit(i, edma_inuse);
>
> irq = platform_get_irq(pdev, 0);
> status = request_irq(irq, dma_irq_handler, 0, "edma", &pdev->dev);
> diff --git a/arch/arm/mach-davinci/include/mach/edma.h
> b/arch/arm/mach-davinci/include/mach/edma.h
> index b467358..cb45960 100644
> --- a/arch/arm/mach-davinci/include/mach/edma.h
> +++ b/arch/arm/mach-davinci/include/mach/edma.h
> @@ -222,8 +222,13 @@ struct edma_soc_info {
> unsigned n_slot;
> unsigned n_tc;
>
> - /* list of channels with no even trigger; terminated by "-1" */
> + /* list of channels with no event trigger; terminated by "-1" */
> const s8 *noevent;
> + u16 dsp_reserve_slot_min;
> + u16 dsp_reserve_slot_max;
> + /* only "no event" channels in range below are reserved */
> + u16 dsp_reserve_channel_min;
> + u16 dsp_reserve_channel_max;
> };
>
> #endif
> --
> 1.5.4.3
>
>
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