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/arch/mips/loongson/common/cs5536/cs5536_pci.c

http://github.com/mirrors/linux
C | 87 lines | 50 code | 10 blank | 27 comment | 16 complexity | a7cdd47e3152620769f5aa45342bc5ca MD5 | raw file
 1/*
 2 * read/write operation to the PCI config space of CS5536
 3 *
 4 * Copyright (C) 2007 Lemote, Inc.
 5 * Author : jlliu, liujl@lemote.com
 6 *
 7 * Copyright (C) 2009 Lemote, Inc.
 8 * Author: Wu Zhangjin, wuzhangjin@gmail.com
 9 *
10 * This program is free software; you can redistribute	it and/or modify it
11 * under  the terms of	the GNU General	 Public License as published by the
12 * Free Software Foundation;  either version 2 of the  License, or (at your
13 * option) any later version.
14 *
15 *	the Virtual Support Module(VSM) for virtulizing the PCI
16 *	configure space are defined in cs5536_modulename.c respectively,
17 *
18 *	after this virtulizing, user can access the PCI configure space
19 *	directly as a normal multi-function PCI device which follows
20 *	the PCI-2.2 spec.
21 */
22
23#include <linux/types.h>
24#include <cs5536/cs5536_vsm.h>
25
26enum {
27	CS5536_FUNC_START = -1,
28	CS5536_ISA_FUNC,
29	reserved_func,
30	CS5536_IDE_FUNC,
31	CS5536_ACC_FUNC,
32	CS5536_OHCI_FUNC,
33	CS5536_EHCI_FUNC,
34	CS5536_FUNC_END,
35};
36
37static const cs5536_pci_vsm_write vsm_conf_write[] = {
38	[CS5536_ISA_FUNC]	pci_isa_write_reg,
39	[reserved_func]		NULL,
40	[CS5536_IDE_FUNC]	pci_ide_write_reg,
41	[CS5536_ACC_FUNC]	pci_acc_write_reg,
42	[CS5536_OHCI_FUNC]	pci_ohci_write_reg,
43	[CS5536_EHCI_FUNC]	pci_ehci_write_reg,
44};
45
46static const cs5536_pci_vsm_read vsm_conf_read[] = {
47	[CS5536_ISA_FUNC]	pci_isa_read_reg,
48	[reserved_func]		NULL,
49	[CS5536_IDE_FUNC]	pci_ide_read_reg,
50	[CS5536_ACC_FUNC]	pci_acc_read_reg,
51	[CS5536_OHCI_FUNC]	pci_ohci_read_reg,
52	[CS5536_EHCI_FUNC]	pci_ehci_read_reg,
53};
54
55/*
56 * write to PCI config space and transfer it to MSR write.
57 */
58void cs5536_pci_conf_write4(int function, int reg, u32 value)
59{
60	if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
61		return;
62	if ((reg < 0) || (reg > 0x100) || ((reg & 0x03) != 0))
63		return;
64
65	if (vsm_conf_write[function] != NULL)
66		vsm_conf_write[function](reg, value);
67}
68
69/*
70 * read PCI config space and transfer it to MSR access.
71 */
72u32 cs5536_pci_conf_read4(int function, int reg)
73{
74	u32 data = 0;
75
76	if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
77		return 0;
78	if ((reg < 0) || ((reg & 0x03) != 0))
79		return 0;
80	if (reg > 0x100)
81		return 0xffffffff;
82
83	if (vsm_conf_read[function] != NULL)
84		data = vsm_conf_read[function](reg);
85
86	return data;
87}