arch/cris/arch-v10/lib/dmacopy.c

   1 /* $Id: dmacopy.c,v 1.1 2001/12/17 13:59:27 bjornw Exp $
   2  *
   3  * memcpy for large blocks, using memory-memory DMA channels 6 and 7 in Etrax
   4  */
   5
   6 #include <asm/svinto.h>
   7 #include <asm/io.h>
   8
   9 #define D(x)
  10
  11 void *dma_memcpy(void *pdst,
  12                  const void *psrc,
  13                  unsigned int pn)
  14 {
  15         static etrax_dma_descr indma, outdma;
  16
  17         D(printk("dma_memcpy %d bytes... ", pn));
  18
  19 #if 0
  20         *R_GEN_CONFIG = genconfig_shadow =
  21                 (genconfig_shadow & ~0x3c0000) |
  22                 IO_STATE(R_GEN_CONFIG, dma6, intdma7) |
  23                 IO_STATE(R_GEN_CONFIG, dma7, intdma6);
  24 #endif
  25         indma.sw_len = outdma.sw_len = pn;
  26         indma.ctrl = d_eol | d_eop;
  27         outdma.ctrl = d_eol;
  28         indma.buf = psrc;
  29         outdma.buf = pdst;
  30
  31         *R_DMA_CH6_FIRST = &indma;
  32         *R_DMA_CH7_FIRST = &outdma;
  33         *R_DMA_CH6_CMD = IO_STATE(R_DMA_CH6_CMD, cmd, start);
  34         *R_DMA_CH7_CMD = IO_STATE(R_DMA_CH7_CMD, cmd, start);
  35
  36         while(*R_DMA_CH7_CMD == 1) /* wait for completion */ ;
  37
  38         D(printk("done\n"));
  39
  40 }
  41
  42
  43