1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * read/write operation to the PCI config space of CS5536
4 *
5 * Copyright (C) 2007 Lemote, Inc.
6 * Author : jlliu, liujl@lemote.com
7 *
8 * Copyright (C) 2009 Lemote, Inc.
9 * Author: Wu Zhangjin, wuzhangjin@gmail.com
10 *
11 *	the Virtual Support Module(VSM) for virtulizing the PCI
12 *	configure space are defined in cs5536_modulename.c respectively,
13 *
14 *	after this virtulizing, user can access the PCI configure space
15 *	directly as a normal multi-function PCI device which follows
16 *	the PCI-2.2 spec.
17 */
18
19#include <linux/types.h>
20#include <cs5536/cs5536_pci.h>
21#include <cs5536/cs5536_vsm.h>
22
23enum {
24	CS5536_FUNC_START = -1,
25	CS5536_ISA_FUNC,
26	reserved_func,
27	CS5536_IDE_FUNC,
28	CS5536_ACC_FUNC,
29	CS5536_OHCI_FUNC,
30	CS5536_EHCI_FUNC,
31	CS5536_FUNC_END,
32};
33
34static const cs5536_pci_vsm_write vsm_conf_write[] = {
35	[CS5536_ISA_FUNC]	= pci_isa_write_reg,
36	[reserved_func]		= NULL,
37	[CS5536_IDE_FUNC]	= pci_ide_write_reg,
38	[CS5536_ACC_FUNC]	= pci_acc_write_reg,
39	[CS5536_OHCI_FUNC]	= pci_ohci_write_reg,
40	[CS5536_EHCI_FUNC]	= pci_ehci_write_reg,
41};
42
43static const cs5536_pci_vsm_read vsm_conf_read[] = {
44	[CS5536_ISA_FUNC]	= pci_isa_read_reg,
45	[reserved_func]		= NULL,
46	[CS5536_IDE_FUNC]	= pci_ide_read_reg,
47	[CS5536_ACC_FUNC]	= pci_acc_read_reg,
48	[CS5536_OHCI_FUNC]	= pci_ohci_read_reg,
49	[CS5536_EHCI_FUNC]	= pci_ehci_read_reg,
50};
51
52/*
53 * write to PCI config space and transfer it to MSR write.
54 */
55void cs5536_pci_conf_write4(int function, int reg, u32 value)
56{
57	if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
58		return;
59	if ((reg < 0) || (reg > 0x100) || ((reg & 0x03) != 0))
60		return;
61
62	if (vsm_conf_write[function] != NULL)
63		vsm_conf_write[function](reg, value);
64}
65
66/*
67 * read PCI config space and transfer it to MSR access.
68 */
69u32 cs5536_pci_conf_read4(int function, int reg)
70{
71	u32 data = 0;
72
73	if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
74		return 0;
75	if ((reg < 0) || ((reg & 0x03) != 0))
76		return 0;
77	if (reg > 0x100)
78		return 0xffffffff;
79
80	if (vsm_conf_read[function] != NULL)
81		data = vsm_conf_read[function](reg);
82
83	return data;
84}
85