ddi_dma_burstsizes(9F)

NAME

     ddi_dma_burstsizes - find out the allowed burst sizes for  a
     DMA mapping

SYNOPSIS

     #include <sys/conf.h>
     #include <sys/ddi.h>
     #include <sys/sunddi.h>

     int ddi_dma_burstsizes(ddi_dma_handle_t handle);

INTERFACE LEVEL

     Solaris DDI specific (Solaris DDI).

PARAMETERS

     handle
           A DMA handle that was filled in by a  successful  call
           to ddi_dma_setup(9F).

DESCRIPTION

     ddi_dma_burstsizes() returns the allowed burst sizes  for  a
     DMA  mapping. This value is derived from the dlim_burstsizes
     member of the ddi_dma_lim_sparc(9S) structure, but it  shows
     the  allowable  burstsizes  after imposing on it the limita-
     tions of other device layers in  addition  to  device's  own
     limitations.

RETURN VALUES

     ddi_dma_burstsizes() returns a binary encoded value  of  the
     allowable  DMA  burst sizes. See ddi_dma_lim_sparc(9S) for a
     discussion of DMA burst sizes.

CONTEXT

     This function can be called from user or interrupt context.

SEE ALSO

     ddi_dma_devalign(9F),                     ddi_dma_setup(9F),
     ddi_dma_lim_sparc(9S), ddi_dma_req(9S)

     Writing Device Drivers