ddi_dma_coff(9F)					   Kernel Functions for Drivers 					  ddi_dma_coff(9F)

NAME

       ddi_dma_coff - convert a DMA cookie to an offset within a DMA handle.

SYNOPSIS

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

       int ddi_dma_coff(ddi_dma_handle_t handle, ddi_dma_cookie_t *cookiep,
	    off_t *offp);

INTERFACE LEVEL

       Solaris SPARC DDI (Solaris SPARC DDI). This interface is obsolete.

PARAMETERS

       handle	  The handle filled in by a call to ddi_dma_setup(9F).

       cookiep	  A pointer to a DMA cookie (see ddi_dma_cookie(9S)) that contains the appropriate address, length and bus type to be used in pro-
		  gramming the DMA engine.

       offp	  A pointer to an offset to be filled in.

DESCRIPTION

       The ddi_dma_coff() function converts the values in DMA cookie pointed to by cookiep to an offset (in  bytes)  from  the	beginning  of  the
       object that the DMAhandle has mapped.

       The  ddi_dma_coff() function allows a driver to update a DMA cookie with values it reads from its device's DMA engine after a transfer com-
       pletes and convert that value into an offset into the object that is mapped for DMA.

RETURN VALUES

       The ddi_dma_coff() function returns:

       DDI_SUCCESS    Successfully filled in offp.

       DDI_FAILURE    Failed to successfully fill in offp.

CONTEXT

       The ddi_dma_coff() function can be called from user, interrupt, or kernel context.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Obsolete			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ddi_dma_setup(9F), ddi_dma_sync(9F), ddi_dma_cookie(9S)

       Writing Device Drivers

SunOS 5.11							    16 Jan 2006 						  ddi_dma_coff(9F)