pci_subr.c revision 223520 
1/*-
2 * Copyright (c) 2011 Advanced Computing Technologies LLC
3 * Written by: John H. Baldwin <jhb@FreeBSD.org>
4 * 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 AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: head/sys/dev/pci/pci_subr.c 223520 2011-06-24 21:39:38Z jhb $");
30
31/*
32 * Support APIs for Host to PCI bridge drivers and drivers that
33 * provide PCI domains.
34 */
35
36#include <sys/types.h>
37#include <sys/bus.h>
38#include <sys/rman.h>
39
40#include <dev/pci/pcireg.h>
41#include <dev/pci/pcivar.h>
42#include <dev/pci/pcib_private.h>
43
44/*
45 * Try to read the bus number of a host-PCI bridge using appropriate config
46 * registers.
47 */
48int
49host_pcib_get_busno(pci_read_config_fn read_config, int bus, int slot, int func,
50    uint8_t *busnum)
51{
52	uint32_t id;
53
54	id = read_config(bus, slot, func, PCIR_DEVVENDOR, 4);
55	if (id == 0xffffffff)
56		return (0);
57
58	switch (id) {
59	case 0x12258086:
60		/* Intel 824?? */
61		/* XXX This is a guess */
62		/* *busnum = read_config(bus, slot, func, 0x41, 1); */
63		*busnum = bus;
64		break;
65	case 0x84c48086:
66		/* Intel 82454KX/GX (Orion) */
67		*busnum = read_config(bus, slot, func, 0x4a, 1);
68		break;
69	case 0x84ca8086:
70		/*
71		 * For the 450nx chipset, there is a whole bundle of
72		 * things pretending to be host bridges. The MIOC will
73		 * be seen first and isn't really a pci bridge (the
74		 * actual busses are attached to the PXB's). We need to
75		 * read the registers of the MIOC to figure out the
76		 * bus numbers for the PXB channels.
77		 *
78		 * Since the MIOC doesn't have a pci bus attached, we
79		 * pretend it wasn't there.
80		 */
81		return (0);
82	case 0x84cb8086:
83		switch (slot) {
84		case 0x12:
85			/* Intel 82454NX PXB#0, Bus#A */
86			*busnum = read_config(bus, 0x10, func, 0xd0, 1);
87			break;
88		case 0x13:
89			/* Intel 82454NX PXB#0, Bus#B */
90			*busnum = read_config(bus, 0x10, func, 0xd1, 1) + 1;
91			break;
92		case 0x14:
93			/* Intel 82454NX PXB#1, Bus#A */
94			*busnum = read_config(bus, 0x10, func, 0xd3, 1);
95			break;
96		case 0x15:
97			/* Intel 82454NX PXB#1, Bus#B */
98			*busnum = read_config(bus, 0x10, func, 0xd4, 1) + 1;
99			break;
100		}
101		break;
102
103		/* ServerWorks -- vendor 0x1166 */
104	case 0x00051166:
105	case 0x00061166:
106	case 0x00081166:
107	case 0x00091166:
108	case 0x00101166:
109	case 0x00111166:
110	case 0x00171166:
111	case 0x01011166:
112	case 0x010f1014:
113	case 0x01101166:
114	case 0x02011166:
115	case 0x02251166:
116	case 0x03021014:
117		*busnum = read_config(bus, slot, func, 0x44, 1);
118		break;
119
120		/* Compaq/HP -- vendor 0x0e11 */
121	case 0x60100e11:
122		*busnum = read_config(bus, slot, func, 0xc8, 1);
123		break;
124	default:
125		/* Don't know how to read bus number. */
126		return 0;
127	}
128
129	return 1;
130}
131