cartrominit.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* unpublished proprietary information of Silicon Graphics, Inc., and *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"
OSPiHandle __CartRomHandle;
/*
* Name: osCartRomInit
*
* Description:
* Get cartridge rom handler
*
*/
OSPiHandle *
osCartRomInit(void)
{
u32 value = 0;
u32 saveMask;
static s32 first = 1;
register u32 stat;
u32 latency, pulse, pageSize, relDuration;
/* Block to get resource token */
__osPiGetAccess();
/*
* ２回目以降は既に取得した設定値を返す
*/
if (! first)
{
/* Return resource token */
__osPiRelAccess();
return(&__CartRomHandle);
}
first = 0;
__CartRomHandle.type = DEVICE_TYPE_CART;
__CartRomHandle.baseAddress = PHYS_TO_K1(PI_DOM1_ADDR2);
__CartRomHandle.domain = PI_DOMAIN1;
/* Fill speed and transferInfo to zero */
__CartRomHandle.speed = 0;
bzero(&(__CartRomHandle.transferInfo),
sizeof(__CartRomHandle.transferInfo));
/*
* ロムのアクセススピードを得る。EPI と同様の処理。
*/
stat = IO_READ(PI_STATUS_REG);
while (stat & (PI_STATUS_IO_BUSY | PI_STATUS_DMA_BUSY)) {
stat = IO_READ(PI_STATUS_REG);
}
/*
* アクセススピードを変更する前に、現在の値を保存しておく
*/
latency = IO_READ(PI_BSD_DOM1_LAT_REG);
pageSize = IO_READ(PI_BSD_DOM1_PGS_REG);
relDuration = IO_READ(PI_BSD_DOM1_RLS_REG);
pulse = IO_READ(PI_BSD_DOM1_PWD_REG);
/*
* アクセススピード値を読むため、超低速な値に設定。
*/
IO_WRITE(PI_BSD_DOM1_LAT_REG, (u8)0xff);
IO_WRITE(PI_BSD_DOM1_PGS_REG, (u8)0x0);
IO_WRITE(PI_BSD_DOM1_RLS_REG, (u8)0x3);
IO_WRITE(PI_BSD_DOM1_PWD_REG, (u8)0xff);
/*
* 先頭をリード
*/
value = IO_READ((u32)__CartRomHandle.baseAddress);
__CartRomHandle.latency = (u8)(value & 0xff);
__CartRomHandle.pageSize = (u8)((value >> 16) & 0xf);
__CartRomHandle.relDuration = (u8)((value >> 20) & 0xf);
__CartRomHandle.pulse = (u8)((value >> 8) & 0xff);
/*
* PI バスの設定値を、変更前に戻しておく
*/
IO_WRITE(PI_BSD_DOM1_LAT_REG, latency);
IO_WRITE(PI_BSD_DOM1_PGS_REG, pageSize);
IO_WRITE(PI_BSD_DOM1_RLS_REG, relDuration);
IO_WRITE(PI_BSD_DOM1_PWD_REG, pulse);
/*
* cartrominit は PI バスの設定値を変更しない
* よって、__osCurrentHandle の値も変更してはいけない
*/
/*
* Put the CartRomHandle onto PiTable
*/
saveMask = __osDisableInt();
__CartRomHandle.next = __osPiTable;
__osPiTable = &__CartRomHandle;
__osRestoreInt(saveMask);
/* Return resource token */
__osPiRelAccess();
return(&__CartRomHandle);
} /* osCartRomInit */