1 /* $NetBSD: pci.c,v 1.2 2008/05/14 13:29:28 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
39 uint32_t
pcicfgread(uint32_t tag,uint32_t off)40 pcicfgread(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