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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 This interface is obsolete.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 programming 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 completes 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

Index

NAME

SYNOPSIS

INTERFACE LEVEL

PARAMETERS

DESCRIPTION

RETURN VALUES

CONTEXT

ATTRIBUTES

SEE ALSO

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