1/*	$NetBSD: pci.c,v 1.1 2008/03/01 18:13:02 tsutsui Exp $	*/
2
3/*-
4 * Copyright (c) 2008 Izumi Tsutsui.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/param.h>
28
29#include <lib/libsa/stand.h>
30#include <lib/libkern/libkern.h>
31
32#include <mips/cpuregs.h>
33#include <cobalt/dev/gtreg.h>
34
35#include "boot.h"
36
37#define GT_BASE		0x14000000
38
39uint32_t
40pcicfgread(uint32_t tag, uint32_t off)
41{
42	uint32_t reg;
43	volatile uint32_t *pcicfg_addr, *pcicfg_data;
44
45	pcicfg_addr = (uint32_t *)MIPS_PHYS_TO_KSEG1(GT_BASE + GT_PCICFG_ADDR);
46	pcicfg_data = (uint32_t *)MIPS_PHYS_TO_KSEG1(GT_BASE + GT_PCICFG_DATA);
47
48	*pcicfg_addr = PCICFG_ENABLE | tag | (off & ~3U);
49	reg = *pcicfg_data;
50	*pcicfg_addr = 0;
51
52	return reg;
53}
54