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
  10 void *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