'\" te
.\" Copyright (c) 1997, Sun Microsystems, Inc.
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.TH DDI_DMA_SET_SBUS64 9F "Jan 1, 1997"
.SH NAME
ddi_dma_set_sbus64 \- allow 64-bit transfers on SBus
.SH SYNOPSIS
.nf
#include <sys/ddi.h>
#include <sys/sunddi.h>



\fBint\fR \fBddi_dma_set_sbus64\fR(\fBddi_dma_handle_t\fR \fIhandle\fR, \fBuint_t\fR \fIburstsizes\fR);
.fi

.SH INTERFACE LEVEL
illumos DDI specific (illumos DDI).
.SH PARAMETERS
.ne 2
.na
\fB\fIhandle\fR \fR
.ad
.RS 15n
The handle filled in by a call to \fBddi_dma_alloc_handle\fR(9F).
.RE

.sp
.ne 2
.na
\fB\fIburstsizes\fR \fR
.ad
.RS 15n
The possible burst sizes the device's \fBDMA\fR engine can accept in 64-bit
mode.
.RE

.SH DESCRIPTION
\fBddi_dma_set_sbus64()\fR informs the system that the device wishes to perform
64-bit data transfers on the SBus. The driver must first allocate a  \fBDMA\fR
handle using  \fBddi_dma_alloc_handle\fR(9F) with a \fBddi_dma_attr\fR(9S)
structure describing the  \fBDMA\fR attributes for a 32-bit transfer mode.
.sp
.LP
\fIburstsizes\fR describes the possible burst sizes the device's  \fBDMA\fR
engine can accept in 64-bit mode. It may be  distinct from the burst sizes for
32-bit mode set in the  \fBddi_dma_attr\fR(9S) structure. The system will
activate 64-bit SBus transfers if the SBus supports them. Otherwise, the SBus
will operate in 32-bit mode.
.sp
.LP
After  \fBDMA\fR resources have been allocated (see
\fBddi_dma_addr_bind_handle\fR(9F) or  \fBddi_dma_buf_bind_handle\fR(9F)), the
driver should retrieve the available burst sizes by calling
\fBddi_dma_burstsizes\fR(9F). This function will return the burst sizes  in
64-bit mode if the system was able to  activate 64-bit transfers.  Otherwise
burst sizes will be  returned in 32-bit mode.
.SH RETURN VALUES
\fBddi_dma_set_sbus64()\fR returns:
.sp
.ne 2
.na
\fB\fBDDI_SUCCESS\fR \fR
.ad
.RS 16n
Successfully set the SBus to 64-bit mode.
.RE

.sp
.ne 2
.na
\fB\fBDDI_FAILURE\fR \fR
.ad
.RS 16n
64-bit mode could not be set.
.RE

.SH CONTEXT
\fBddi_dma_set_sbus64()\fR can be called from user, kernel, or interrupt
context.
.SH ATTRIBUTES
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Architecture	SBus
.TE

.SH SEE ALSO
\fBattributes\fR(5), \fBddi_dma_addr_bind_handle\fR(9F),
\fBddi_dma_alloc_handle\fR(9F), \fBddi_dma_buf_bind_handle\fR(9F),
\fBddi_dma_burstsizes\fR(9F), \fBddi_dma_attr\fR(9S)
.SH NOTES
64-bit SBus mode is activated on a per SBus slot basis. If there are multiple
SBus cards in one slot, they all must operate in 64-bit mode or they all must
operate in 32-bit mode.