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). 

ARGUMENTS

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 limitations 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

SunOS 5.5/SPARC  —  Last change: 1 Feb 1994