arch/arm/mach-pxa/dma_needs_bounce.c

   1 /*
   2  * PXA-specific dma_needs_bounce
   3  *
   4  * Some PXA platforms (h5400, eseries) have different requirements for DMA
   5  * bouncing, so we define a dma_needs_bounce() that can call a
   6  * platform-specific function set by pxa_set_dma_needs_bounce().
   7  *
   8  * Better would be to teach dmabounce.c to allow the dma_needs_bounce function
   9  * to be set at run-time; this is just a stop-gap.
  10  */
  11
  12 #include <linux/device.h>
  13 #include <linux/dma-mapping.h>
  14
  15 static int (*dma_needs_bounce_p)(struct device*, dma_addr_t, size_t) = NULL;
  16
  17 void
  18 pxa_set_dma_needs_bounce(void *needs_bounce_func)
  19 {
  20         dma_needs_bounce_p = needs_bounce_func;
  21 }
  22 EXPORT_SYMBOL(pxa_set_dma_needs_bounce);
  23
  24 int
  25 dma_needs_bounce(struct device *dev, dma_addr_t addr, size_t size) {
  26
  27         return dma_needs_bounce_p ? dma_needs_bounce_p(dev, addr, size) : 0;
  28 }