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

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