/*      $NetBSD: pci.c,v 1.2 2008/05/14 13:29:28 tsutsui Exp $  */

/*-
* Copyright (c) 2008 Izumi Tsutsui.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/param.h>

#include <lib/libsa/stand.h>
#include <lib/libkern/libkern.h>

#include <mips/cpuregs.h>
#include <cobalt/dev/gtreg.h>

#include "boot.h"

#define GT_BASE         0x14000000

uint32_t
pcicfgread(uint32_t tag, uint32_t off)
{
       uint32_t reg;
       volatile uint32_t *pcicfg_addr, *pcicfg_data;

       pcicfg_addr = (uint32_t *)MIPS_PHYS_TO_KSEG1(GT_BASE + GT_PCICFG_ADDR);
       pcicfg_data = (uint32_t *)MIPS_PHYS_TO_KSEG1(GT_BASE + GT_PCICFG_DATA);

       *pcicfg_addr = PCICFG_ENABLE | tag | (off & ~3U);
       reg = *pcicfg_data;
       *pcicfg_addr = 0;

       return reg;
}