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Copyright (c) 1994, Sun Microsystems, Inc.
The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
Copyright (c) 1994, Sun Microsystems, Inc.
The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
ddi_dma_burstsizes 9F "1 Feb 1994" "SunOS 5.11" "Kernel Functions for Drivers"
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 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