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_pci.h>
25 #include <cs5536/cs5536_vsm.h>
26
27 enum {
28 CS5536_FUNC_START = -1,
29 CS5536_ISA_FUNC,
30 reserved_func,
31 CS5536_IDE_FUNC,
32 CS5536_ACC_FUNC,
33 CS5536_OHCI_FUNC,
34 CS5536_EHCI_FUNC,
35 CS5536_FUNC_END,
36 };
37
38 static const cs5536_pci_vsm_write vsm_conf_write[] = {
39 [CS5536_ISA_FUNC] = pci_isa_write_reg,
40 [reserved_func] = NULL,
41 [CS5536_IDE_FUNC] = pci_ide_write_reg,
42 [CS5536_ACC_FUNC] = pci_acc_write_reg,
43 [CS5536_OHCI_FUNC] = pci_ohci_write_reg,
44 [CS5536_EHCI_FUNC] = pci_ehci_write_reg,
45 };
46
47 static const cs5536_pci_vsm_read vsm_conf_read[] = {
48 [CS5536_ISA_FUNC] = pci_isa_read_reg,
49 [reserved_func] = NULL,
50 [CS5536_IDE_FUNC] = pci_ide_read_reg,
51 [CS5536_ACC_FUNC] = pci_acc_read_reg,
52 [CS5536_OHCI_FUNC] = pci_ohci_read_reg,
53 [CS5536_EHCI_FUNC] = pci_ehci_read_reg,
54 };
55
56 /*
57 * write to PCI config space and transfer it to MSR write.
58 */
cs5536_pci_conf_write4(int function,int reg,u32 value)59 void cs5536_pci_conf_write4(int function, int reg, u32 value)
60 {
61 if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
62 return;
63 if ((reg < 0) || (reg > 0x100) || ((reg & 0x03) != 0))
64 return;
65
66 if (vsm_conf_write[function] != NULL)
67 vsm_conf_write[function](reg, value);
68 }
69
70 /*
71 * read PCI config space and transfer it to MSR access.
72 */
cs5536_pci_conf_read4(int function,int reg)73 u32 cs5536_pci_conf_read4(int function, int reg)
74 {
75 u32 data = 0;
76
77 if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
78 return 0;
79 if ((reg < 0) || ((reg & 0x03) != 0))
80 return 0;
81 if (reg > 0x100)
82 return 0xffffffff;
83
84 if (vsm_conf_read[function] != NULL)
85 data = vsm_conf_read[function](reg);
86
87 return data;
88 }
89
