Tony,
Did you happen to have a look at these couple of patches ?
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of
> Shilimkar, Santosh
> Sent: Wednesday, February 04, 2009 2:39 PM
> To: Tony Lindgren
> Cc: [email protected]
> Subject: [PATCH] OMAP: sDMA: DMA channel reservation using bootargs
>
> Tony,
> Here is the first patch as promised.
>
> From: Santosh Shilimkar <[email protected]>
>
> This patch set up a cmdline option for omap dma for masking the
> available channels. It is needed since the OMAP DMA is a
> system wide
> resource and can be used by another software apart from
> the kernel.
>
> To reserve the omap SDMA channels for kernel dma usage,
> use cmdline
> bootarg "omap_dma_reserve_ch=". The valid range is 1 to 32.
>
> Signed-off-by: Santosh Shilimkar <[email protected]>
> Acked By: Nishant Kamat <[email protected]>
> cc: Tony Lindgren <[email protected]>
> ---
> arch/arm/plat-omap/dma.c | 20 +++++++++++++++++++-
> 1 files changed, 19 insertions(+), 1 deletion(-)
>
> Index: omapkernel/arch/arm/plat-omap/dma.c
> ===================================================================
> --- omapkernel.orig/arch/arm/plat-omap/dma.c 2009-02-04
> 12:11:55.779687209 +0530
> +++ omapkernel/arch/arm/plat-omap/dma.c 2009-02-04
> 14:05:32.971853579 +0530
> @@ -131,6 +131,7 @@ static struct dma_link_info *dma_linked_
>
> static int dma_lch_count;
> static int dma_chan_count;
> +static int omap_dma_reserve_channels;
>
> static spinlock_t dma_chan_lock;
> static struct omap_dma_lch *dma_chan;
> @@ -2409,6 +2410,10 @@ static int __init omap_init_dma(void)
> return -ENODEV;
> }
>
> + if (cpu_class_is_omap2() && omap_dma_reserve_channels
> + && (omap_dma_reserve_channels <= dma_lch_count))
> + dma_lch_count = omap_dma_reserve_channels;
> +
> dma_chan = kzalloc(sizeof(struct omap_dma_lch) * dma_lch_count,
> GFP_KERNEL);
> if (!dma_chan)
> @@ -2459,7 +2464,7 @@ static int __init omap_init_dma(void)
> u8 revision = dma_read(REVISION) & 0xff;
> printk(KERN_INFO "OMAP DMA hardware revision %d.%d\n",
> revision >> 4, revision & 0xf);
> - dma_chan_count = OMAP_DMA4_LOGICAL_DMA_CH_COUNT;
> + dma_chan_count = dma_lch_count;
> } else {
> dma_chan_count = 0;
> return 0;
> @@ -2525,4 +2530,17 @@ static int __init omap_init_dma(void)
>
> arch_initcall(omap_init_dma);
>
> +/*
> + * Reserve the omap SDMA channels using cmdline bootarg
> + * "omap_dma_reserve_ch=". The valid range is 1 to 32
> + */
> +static int __init omap_dma_cmdline_reserve_ch(char *str)
> +{
> + if (get_option(&str, &omap_dma_reserve_channels) != 1)
> + omap_dma_reserve_channels = 0;
> + return 1;
> +}
> +
> +__setup("omap_dma_reserve_ch=", omap_dma_cmdline_reserve_ch);
> +
>
>
> Regards,
> Santosh
> --
> To unsubscribe from this list: send the line "unsubscribe
> linux-omap" in
> the body of a message to [email protected]
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
> --
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
