From a924db7c00655447c5228bd74da070c69b7cadbc Mon Sep 17 00:00:00 2001 From: Michael Hennerich Date: Fri, 3 Aug 2007 17:43:29 +0800 Subject: [PATCH] Blackfin arch: Add option to priorize DMA over Core Signed-off-by: Michael Hennerich Signed-off-by: Bryan Wu --- arch/blackfin/kernel/bfin_dma_5xx.c | 5 +++++ arch/blackfin/mach-bf548/Kconfig | 7 +++++++ 2 files changed, 12 insertions(+) diff --git a/arch/blackfin/kernel/bfin_dma_5xx.c b/arch/blackfin/kernel/bfin_dma_5xx.c index 7e22019083..62f5a35c13 100644 --- a/arch/blackfin/kernel/bfin_dma_5xx.c +++ b/arch/blackfin/kernel/bfin_dma_5xx.c @@ -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; } diff --git a/arch/blackfin/mach-bf548/Kconfig b/arch/blackfin/mach-bf548/Kconfig index 3976b7f523..08d8dc8370 100644 --- a/arch/blackfin/mach-bf548/Kconfig +++ b/arch/blackfin/mach-bf548/Kconfig @@ -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" -- 2.39.5