target/linux/lantiq/patches-3.8/0020-MIPS-lantiq-adds-4dword-burst-length-for-dma.patch

   1 From 5be3837d01ea56e1455781f1b51764bd896973f2 Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Thu, 6 Dec 2012 11:59:23 +0100
   4 Subject: [PATCH 20/40] MIPS: lantiq: adds 4dword burst length for dma
   5
   6 ---
   7  arch/mips/lantiq/xway/dma.c |    4 +++-
   8  1 file changed, 3 insertions(+), 1 deletion(-)
   9
  10 --- a/arch/mips/lantiq/xway/dma.c
  11 +++ b/arch/mips/lantiq/xway/dma.c
  12 @@ -47,6 +47,7 @@
  13  #define DMA_IRQ_ACK            0x7e            /* IRQ status register */
  14  #define DMA_POLL               BIT(31)         /* turn on channel polling */
  15  #define DMA_CLK_DIV4           BIT(6)          /* polling clock divider */
  16 +#define DMA_4W_BURST           BIT(2)          /* 4 word burst length */
  17  #define DMA_2W_BURST           BIT(1)          /* 2 word burst length */
  18  #define DMA_MAX_CHANNEL                20              /* the soc has 20 channels */
  19  #define DMA_ETOP_ENDIANNESS    (0xf << 8) /* endianness swap etop channels */
  20 @@ -195,7 +196,8 @@ ltq_dma_init_port(int p)
  21                  * Tell the DMA engine to swap the endianness of data frames and
  22                  * drop packets if the channel arbitration fails.
  23                  */
  24 -               ltq_dma_w32_mask(0, DMA_ETOP_ENDIANNESS | DMA_PDEN,
  25 +               ltq_dma_w32_mask(0, (DMA_4W_BURST << 4) | (DMA_4W_BURST << 2) |
  26 +                       DMA_ETOP_ENDIANNESS | DMA_PDEN,
  27                         LTQ_DMA_PCTRL);
  28                 break;
  29