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Blackfin arch: Add option to priorize DMA over Core 

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
This commit is contained in:
Michael Hennerich 2007-08-03 17:43:29 +08:00 committed by Bryan Wu
parent 7735cefc45
commit a924db7c00
2 changed files with 12 additions and 0 deletions
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5
arch/blackfin/kernel/bfin_dma_5xx.c
View File

@ -73,6 +73,11 @@ static int __init blackfin_dma_init(void)
/* Mark MEMDMA Channel 0 as requested since we're using it internally */
dma_ch[CH_MEM_STREAM0_DEST].chan_status = DMA_CHANNEL_REQUESTED;
dma_ch[CH_MEM_STREAM0_SRC].chan_status = DMA_CHANNEL_REQUESTED;
#if defined(CONFIG_DEB_DMA_URGENT)
bfin_write_EBIU_DDRQUE(bfin_read_EBIU_DDRQUE()
| DEB1_URGENT | DEB2_URGENT | DEB3_URGENT);
#endif
return 0;
}

7
arch/blackfin/mach-bf548/Kconfig
View File

@ -2,6 +2,13 @@ if (BF54x)
menu "BF548 Specific Configuration"
config DEB_DMA_URGENT
bool "DMA has priority over core for ext. accesses"
depends on BF54x
default n
help
Treat any DEB1, DEB2 and DEB3 request as Urgent
comment "Interrupt Priority Assignment"
menu "Priority"