dmacopy.c

Go to the documentation of this file.

/*
 * memcpy for large blocks, using memory-memory DMA channels 6 and 7 in Etrax
 */

#include <asm/svinto.h>
#include <asm/io.h>

#define D(x)

void *dma_memcpy(void *pdst,
         const void *psrc,
         unsigned int pn)
{
    static etrax_dma_descr indma, outdma;

    D(printk(KERN_DEBUG "dma_memcpy %d bytes... ", pn));

#if 0
    *R_GEN_CONFIG = genconfig_shadow =
        (genconfig_shadow & ~0x3c0000) |
        IO_STATE(R_GEN_CONFIG, dma6, intdma7) |
        IO_STATE(R_GEN_CONFIG, dma7, intdma6);
#endif
    indma.sw_len = outdma.sw_len = pn;
    indma.ctrl = d_eol | d_eop;
    outdma.ctrl = d_eol;
    indma.buf = psrc;
    outdma.buf = pdst;

    *R_DMA_CH6_FIRST = &indma;
    *R_DMA_CH7_FIRST = &outdma;
    *R_DMA_CH6_CMD = IO_STATE(R_DMA_CH6_CMD, cmd, start);
    *R_DMA_CH7_CMD = IO_STATE(R_DMA_CH7_CMD, cmd, start);

    while (*R_DMA_CH7_CMD == 1)
        /* wait for completion */;

    D(printk(KERN_DEBUG "done\n"));
}