dpsetnextbuf.c
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/*====================================================================
* dpsetnextbuf.c
*
* Copyright 1995, Silicon Graphics, Inc.
* All Rights Reserved.
*
* This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics,
* Inc.; the contents of this file may not be disclosed to third
* parties, copied or duplicated in any form, in whole or in part,
* without the prior written permission of Silicon Graphics, Inc.
*
* RESTRICTED RIGHTS LEGEND:
* Use, duplication or disclosure by the Government is subject to
* restrictions as set forth in subdivision (c)(1)(ii) of the Rights
* in Technical Data and Computer Software clause at DFARS
* 252.227-7013, and/or in similar or successor clauses in the FAR,
* DOD or NASA FAR Supplement. Unpublished - rights reserved under the
* Copyright Laws of the United States.
*====================================================================*/
/**************************************************************************
*
* $Revision: 1.1.1.2 $
* $Date: 2002/10/29 08:06:43 $
* $Source: /root/leakn64/depot/rf/sw/n64os20l/libultra/monegi/rdp/dpsetnextbuf.c,v $
*
**************************************************************************/
#include "osint.h"
#include "rcp.h"
#include "assert.h"
/*
* Name: osDpSetNextBuffer
*
* Description:
* Set up the next DP transfer from RDRAM. bufPtr points to the
* buffer in RDRAM and size specifies the number of bytes to transfer.
* Note that the buffer address must be 64-bit aligned and that size
* must * be a multiple of 8 bytes.
*
* If DP is busy, return a "-1" and abort the operation.
*
* Globals Referenced:
* None
*/
s32
osDpSetNextBuffer(void *bufPtr, u64 size)
{
register u32 stat;
#ifdef _DEBUG
/* Check for 64-bit alignment in buffer address and size */
if ((u32)bufPtr & 0x7) {
__osError(ERR_OSDPSETNEXTBUFFER_ADDR, 1, bufPtr);
return(-1);
}
if (size & 0x7) {
__osError(ERR_OSDPSETNEXTBUFFER_SIZE, 1, size);
return(-1);
}
#endif
if (__osDpDeviceBusy())
return(-1);
IO_WRITE(DPC_STATUS_REG, DPC_CLR_XBUS_DMEM_DMA);
/* Need to wait for xbus_dmem_dma set/cleared */
while (1) {
stat = IO_READ(DPC_STATUS_REG);
if (!(stat & DPC_STATUS_XBUS_DMEM_DMA)) break;
}
IO_WRITE(DPC_START_REG, osVirtualToPhysical(bufPtr));
IO_WRITE(DPC_END_REG, osVirtualToPhysical(bufPtr)+size);
return(0);
} /* osDpSetNextBuffer */