pci_cfgreg.c revision 203106 
1/*-
2 * Copyright (c) 2010 Marcel Moolenaar
3 * Copyright (c) 2001 Doug Rabson
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 * $FreeBSD: head/sys/ia64/pci/pci_cfgreg.c 203106 2010-01-28 04:50:09Z marcel $
28 */
29
30#include <sys/param.h>
31#include <machine/pci_cfgreg.h>
32#include <machine/sal.h>
33
34static u_long
35pci_sal_address(int dom, int bus, int slot, int func, int reg)
36{
37	u_long addr;
38
39	addr = ~0ul;
40	if (dom >= 0 && dom <= 255 && bus >= 0 && bus <= 255 &&
41	    slot >= 0 && slot <= 31 && func >= 0 && func <= 7 &&
42	    reg >= 0 && reg <= 255) {
43		addr = ((u_long)dom << 24) | ((u_long)bus << 16) |
44		    ((u_long)slot << 11) | ((u_long)func << 8) | (u_long)reg;
45	}
46	return (addr);
47}
48
49static int
50pci_valid_access(int reg, int len)
51{
52	int ok;
53
54	ok = ((len == 1 || len == 2 || len == 4) && (reg & (len - 1)) == 0)
55	    ? 1 : 0;
56	return (ok);
57}
58
59int
60pci_cfgregopen(void)
61{
62	return (1);
63}
64
65uint32_t
66pci_cfgregread(int bus, int slot, int func, int reg, int len)
67{
68	struct ia64_sal_result res;
69	u_long addr;
70
71	addr = pci_sal_address(0, bus, slot, func, reg);
72	if (addr == ~0ul)
73		return (~0);
74
75	if (!pci_valid_access(reg, len))
76		return (~0);
77
78	res = ia64_sal_entry(SAL_PCI_CONFIG_READ, addr, len, 0, 0, 0, 0, 0);
79	if (res.sal_status < 0)
80		return (~0);
81
82	return (res.sal_result[0]);
83}
84
85void
86pci_cfgregwrite(int bus, int slot, int func, int reg, uint32_t data, int len)
87{
88	struct ia64_sal_result res;
89	u_long addr;
90
91	addr = pci_sal_address(0, bus, slot, func, reg);
92	if (addr == ~0ul)
93		return;
94
95	if (!pci_valid_access(reg, len))
96		return;
97
98	res = ia64_sal_entry(SAL_PCI_CONFIG_WRITE, addr, len, data, 0, 0, 0, 0);
99}
100