65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
|
/* $Id: at91pdc.c,v 1.2 2008/07/03 01:15:38 matt Exp $ */
|
||
|
|
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <machine/bus.h>
|
||
|
|
#include <arm/at91/at91pdcvar.h>
|
||
|
|
|
||
|
|
int at91pdc_alloc_fifo(bus_dma_tag_t dmat, at91pdc_fifo_t *fifo, int size,
|
||
|
|
int flags)
|
||
|
|
{
|
||
|
|
bus_dma_segment_t segs;
|
||
|
|
int rsegs;
|
||
|
|
int err;
|
||
|
|
int f;
|
||
|
|
|
||
|
|
memset(fifo, 0, sizeof(*fifo));
|
||
|
|
|
||
|
|
/* allocate map: */
|
||
|
|
f = flags & (BUS_DMA_BUS1 | BUS_DMA_BUS2 | BUS_DMA_BUS3 | BUS_DMA_BUS4);
|
||
|
|
err = bus_dmamap_create(dmat, size, 1, size, 0,
|
||
|
|
BUS_DMA_WAITOK | f,
|
||
|
|
&fifo->f_dmamap);
|
||
|
|
if (err)
|
||
|
|
goto fail_0;
|
||
|
|
|
||
|
|
/* allocate DMA safe memory: */
|
||
|
|
f |= flags & BUS_DMA_STREAMING;
|
||
|
|
err = bus_dmamem_alloc(dmat, size, 0, size, &segs, 1, &rsegs,
|
||
|
|
BUS_DMA_WAITOK | f);
|
||
|
|
if (err)
|
||
|
|
goto fail_1;
|
||
|
|
|
||
|
|
/* allocate virtual memory: */
|
||
|
|
f |= flags & (BUS_DMA_COHERENT | BUS_DMA_NOCACHE);
|
||
|
|
err = bus_dmamem_map(dmat, &segs, 1, size, &fifo->f_buf,
|
||
|
|
BUS_DMA_WAITOK | f);
|
||
|
|
if (err)
|
||
|
|
goto fail_2;
|
||
|
|
|
||
|
|
/* connect physical to virtual memory: */
|
||
|
|
f |= flags & (BUS_DMA_READ | BUS_DMA_WRITE);
|
||
|
|
f &= ~(BUS_DMA_COHERENT | BUS_DMA_NOCACHE);
|
||
|
|
err = bus_dmamap_load(dmat, fifo->f_dmamap, fifo->f_buf, size, NULL,
|
||
|
|
BUS_DMA_NOWAIT | f);
|
||
|
|
if (err)
|
||
|
|
goto fail_3;
|
||
|
|
|
||
|
|
/* initialize rest of the structure: */
|
||
|
|
fifo->f_buf_size = size;
|
||
|
|
fifo->f_ndx = fifo->f_length = 0;
|
||
|
|
|
||
|
|
fifo->f_buf_addr = fifo->f_dmamap->dm_segs[0].ds_addr;
|
||
|
|
fifo->f_pdc_rd_ndx = fifo->f_pdc_wr_ndx = 0;
|
||
|
|
fifo->f_pdc_space = fifo->f_buf_size;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
fail_3:
|
||
|
|
bus_dmamem_unmap(dmat, fifo->f_buf, size);
|
||
|
|
fail_2:
|
||
|
|
bus_dmamem_free(dmat, &segs, rsegs);
|
||
|
|
fail_1:
|
||
|
|
bus_dmamap_destroy(dmat, fifo->f_dmamap);
|
||
|
|
fail_0:
|
||
|
|
return err;
|
||
|
|
}
|