contramread.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* unpublished proprietary information of Silicon Graphics, Inc., and *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 "controller.h"
#include "siint.h"
extern OSPifRam __osPfsPifRam; /* RAM buffer */
int __osPfsLastChannel = -1;
/*
* This call issues a read memory card command to controllers to read
* ram pad from controllers.
* A value of 0 is returned if the calls succeed, otherwise
* error code is returned
*/
s32
__osContRamRead(OSMesgQueue *mq, int channel, u16 address, u8 *buffer)
{
s32 ret = 0;
int i;
u8 *ptr;
int retry = 2;
/* Block to get resource token */
__osSiGetAccess();
do { /* Retry if ADRS/DATA CRC error */
ptr = (u8 *)(&__osPfsPifRam);
if (__osContLastCmd != CONT_RAM_READ
|| __osPfsLastChannel != channel) {
__osContLastCmd = CONT_RAM_READ;
__osPfsLastChannel = channel;
/* Set up request command format for all channels */
for (i = 0; i < channel; i++) *ptr++ = 0;
/* set format flag */
__osPfsPifRam.pifstatus = CONT_FORMAT;
/* Setup ram read format */
((__OSContRamReadFormat *)ptr)->dummy = 0xff;
((__OSContRamReadFormat *)ptr)->txsize = 3;
((__OSContRamReadFormat *)ptr)->rxsize = 33;
((__OSContRamReadFormat *)ptr)->cmd = CONT_RAM_READ;
((__OSContRamReadFormat *)ptr)->datacrc = 0xff;
/* setup ram read format */
ptr[sizeof(__OSContRamReadFormat)] = FORMAT_END;
} else {
ptr += channel;
}
((__OSContRamReadFormat *)ptr)->addrh = (u8)(address >>3);
((__OSContRamReadFormat *)ptr)->addrl =
(u8)( (address << 5) | __osContAddressCrc(address)) ;
ret = __osSiRawStartDma(OS_WRITE, &__osPfsPifRam);
(void)osRecvMesg(mq, (OSMesg *)NULL, OS_MESG_BLOCK);
/* trigger pifmacro */
ret = __osSiRawStartDma(OS_READ, &__osPfsPifRam);
(void)osRecvMesg(mq, (OSMesg *)NULL, OS_MESG_BLOCK);
#ifndef _HW_VERSION_1
ret = (s32)((((__OSContRamReadFormat *)ptr)->rxsize & CON_ERR_MASK) >> 4);
#endif
if (ret == 0) {
/* check data CRC */
if (__osContDataCrc(((__OSContRamReadFormat *)ptr)->data)
!= ((__OSContRamReadFormat *)ptr)->datacrc) {
/* reset status */
if ((ret = __osPfsGetStatus(mq, channel)) != 0){
break;
} else {
ret = PFS_ERR_CONTRFAIL;
}
} else {
bcopy(((__OSContRamReadFormat *)ptr)->data, buffer, BLOCKSIZE);
#if 0
if (((__OSContRamReadFormat *)ptr)->datacrc == 0xff) {
ret = __osPfsGetStatus(mq, channel);
}
#endif
}
} else {
ret = PFS_ERR_NOPACK;
}
} while ((ret == PFS_ERR_CONTRFAIL) && (retry-- >= 0));
__osSiRelAccess();
return(ret);
}