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 
23 enum {
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 
34 static 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 
43 static 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  */
cs5536_pci_conf_write4(int function,int reg,u32 value)55 void 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  */
cs5536_pci_conf_read4(int function,int reg)69 u32 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