Tony, Did you happen to have a look at these couple of patches ? > -----Original Message----- > From: linux-omap-owner@xxxxxxxxxxxxxxx > [mailto:linux-omap-owner@xxxxxxxxxxxxxxx] On Behalf Of > Shilimkar, Santosh > Sent: Wednesday, February 04, 2009 2:39 PM > To: Tony Lindgren > Cc: linux-omap@xxxxxxxxxxxxxxx > Subject: [PATCH] OMAP: sDMA: DMA channel reservation using bootargs > > Tony, > Here is the first patch as promised. > > From: Santosh Shilimkar <santosh.shilimkar@xxxxxx> > > 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 <santosh.shilimkar@xxxxxx> > Acked By: Nishant Kamat <nskamat@xxxxxx> > cc: Tony Lindgren <tony@xxxxxxxxxxx> > --- > 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 majordomo@xxxxxxxxxxxxxxx > 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 majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
