epirawread.c
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/**************************************************************************
* *
* Copyright (C) 1995, Silicon Graphics, Inc. *
* *
* These coded instructions, statements, and computer programs contain *
* unpublished proprietary information of Silicon Graphics, Inc., and *
* are protected by Federal copyright law. They may not be disclosed *
* to third parties or copied or duplicated in any form, in whole or *
* in part, without the prior written consent of Silicon Graphics, Inc. *
* *
**************************************************************************/
#include "osint.h"
#include "piint.h"
#include "rcp.h"
#include "assert.h"
/*
* Name: __osEPiRawReadIo
*
* 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.
*
*/
s32
__osEPiRawReadIo(OSPiHandle *pihandle, u32 devAddr, u32 *data)
{
register u32 stat;
register u32 domain;
#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);
}
/* Configuring the PI if needed */
domain = (u32)pihandle->domain;
if (__osCurrentHandle[domain]->type != pihandle->type) {
OSPiHandle *cHandle = __osCurrentHandle[domain];
if (domain == PI_DOMAIN1) {
if (cHandle->latency != pihandle->latency)
IO_WRITE(PI_BSD_DOM1_LAT_REG,pihandle->latency);
if (cHandle->pageSize != pihandle->pageSize)
IO_WRITE(PI_BSD_DOM1_PGS_REG,pihandle->pageSize);
if (cHandle->relDuration != pihandle->relDuration)
IO_WRITE(PI_BSD_DOM1_RLS_REG,
pihandle->relDuration);
if (cHandle->pulse != pihandle->pulse)
IO_WRITE(PI_BSD_DOM1_PWD_REG,pihandle->pulse);
} else {
if (cHandle->latency != pihandle->latency)
IO_WRITE(PI_BSD_DOM2_LAT_REG,pihandle->latency);
if (cHandle->pageSize != pihandle->pageSize)
IO_WRITE(PI_BSD_DOM2_PGS_REG,pihandle->pageSize);
if (cHandle->relDuration != pihandle->relDuration)
IO_WRITE(PI_BSD_DOM2_RLS_REG,
pihandle->relDuration);
if (cHandle->pulse != pihandle->pulse)
IO_WRITE(PI_BSD_DOM2_PWD_REG,pihandle->pulse);
}
cHandle->type = pihandle->type;
cHandle->latency = pihandle->latency;
cHandle->pageSize = pihandle->pageSize;
cHandle->relDuration = pihandle->relDuration;
cHandle->pulse = pihandle->pulse;
}
*data = IO_READ((u32)pihandle->baseAddress | devAddr);
return(0);
} /* __osEPiRawReadIo */