pirawread.c
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/*====================================================================
* pirawread.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* This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics,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 Unpublished - rights reserved under the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/nintendo/pi/pirawread.c,v $
*
**************************************************************************/
#include "osint.h"
#include "rcp.h"
#include "assert.h"
/*
* Name: __osPiRawReadIo
*
* Description:
* Perform a 32-bit programmed IO read from the PI device address space.
* If the interface is busy, return a "-1" and abort the operation.
* Note that address must be 32-bit aligned.
*
* Globals Referenced:
* None
*/
s32
__osPiRawReadIo(u32 devAddr, u32 *data)
{
register u32 stat;
#ifdef _DEBUG
/* Ensure that address is 32-bit aligned */
if (devAddr & 0x3) {
__osError(ERR_OSPIRAWREADIO, 1, devAddr);
return(-1);
}
/* Ensure data pointer is not empty */
assert(data != NULL);
#endif
stat = IO_READ(PI_STATUS_REG);
while (stat & (PI_STATUS_IO_BUSY | PI_STATUS_DMA_BUSY)) {
stat = IO_READ(PI_STATUS_REG);
}
*data = IO_READ((u32)osRomBase | devAddr);
return(0);
} /* __osPiRawReadIo */