aisetnextbuf.c
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/*====================================================================
* aisetnextbuf.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* This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics,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 Unpublished - rights reserved under the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/bbplayer/libultra/monegi/ai/aisetnextbuf.c,v $
*
**************************************************************************/
#include "osint.h"
#include "rcp.h"
#include <assert.h>
/*
* Name: osAiSetNextBuffer
*
* Description:
* Set up the next DMA transfer from RDRAM to audio interface buffer.
* 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 the interface is busy, return a "-1" and abort the operation.
*
* Note:
* The DMA length size is 15-bit long for v1.0 and 18-bit long v2.0.
* Therefore, the maximum DMA size is 32 Kbytes (v1.0) and
* 256 Kbytes (v2.0).
*
* Globals Referenced:
* None
*/
s32
osAiSetNextBuffer(void *bufPtr, u32 size)
{
static u8 hdwrBugFlag = 0;
void *bPtr;
if (__osAiDeviceBusy())
return(-1);
#ifdef _DEBUG
/* Check for 64-bit alignment in buffer address and size */
if ((u32)bufPtr & 0x7) {
__osError(ERR_OSAISETNEXTBUFFER_ADDR, 1, bufPtr);
return(-1);
}
if (size & 0x7) {
__osError(ERR_OSAISETNEXTBUFFER_SIZE, 1, size);
return(-1);
}
#endif
/* audio hardware bug: if end of buffer is at address bXX10 0000 0000 0000. */
/* then the next frame's addr will have 0x2000 added to it */
bPtr = bufPtr;
if(hdwrBugFlag) /* last frame caused problems */
bPtr = (void*)((u32)bufPtr - 0x2000);
if ((((u32)bufPtr + size) & 0x1fff) == 0x0000)
hdwrBugFlag = 1; /* this frame causes problem */
else
hdwrBugFlag = 0; /* this frame is harmless */
/* Need to write address first and length second */
IO_WRITE(AI_DRAM_ADDR_REG, osVirtualToPhysical(bPtr));
IO_WRITE(AI_LEN_REG, size);
return(0);
} /* osAiSetNextBuffer */