1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * read/write operation to the PCI config space of CS5536
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2007 Lemote, Inc.
6*4882a593Smuzhiyun * Author : jlliu, liujl@lemote.com
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * Copyright (C) 2009 Lemote, Inc.
9*4882a593Smuzhiyun * Author: Wu Zhangjin, wuzhangjin@gmail.com
10*4882a593Smuzhiyun *
11*4882a593Smuzhiyun * the Virtual Support Module(VSM) for virtulizing the PCI
12*4882a593Smuzhiyun * configure space are defined in cs5536_modulename.c respectively,
13*4882a593Smuzhiyun *
14*4882a593Smuzhiyun * after this virtulizing, user can access the PCI configure space
15*4882a593Smuzhiyun * directly as a normal multi-function PCI device which follows
16*4882a593Smuzhiyun * the PCI-2.2 spec.
17*4882a593Smuzhiyun */
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #include <linux/types.h>
20*4882a593Smuzhiyun #include <cs5536/cs5536_pci.h>
21*4882a593Smuzhiyun #include <cs5536/cs5536_vsm.h>
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun enum {
24*4882a593Smuzhiyun CS5536_FUNC_START = -1,
25*4882a593Smuzhiyun CS5536_ISA_FUNC,
26*4882a593Smuzhiyun reserved_func,
27*4882a593Smuzhiyun CS5536_IDE_FUNC,
28*4882a593Smuzhiyun CS5536_ACC_FUNC,
29*4882a593Smuzhiyun CS5536_OHCI_FUNC,
30*4882a593Smuzhiyun CS5536_EHCI_FUNC,
31*4882a593Smuzhiyun CS5536_FUNC_END,
32*4882a593Smuzhiyun };
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun static const cs5536_pci_vsm_write vsm_conf_write[] = {
35*4882a593Smuzhiyun [CS5536_ISA_FUNC] = pci_isa_write_reg,
36*4882a593Smuzhiyun [reserved_func] = NULL,
37*4882a593Smuzhiyun [CS5536_IDE_FUNC] = pci_ide_write_reg,
38*4882a593Smuzhiyun [CS5536_ACC_FUNC] = pci_acc_write_reg,
39*4882a593Smuzhiyun [CS5536_OHCI_FUNC] = pci_ohci_write_reg,
40*4882a593Smuzhiyun [CS5536_EHCI_FUNC] = pci_ehci_write_reg,
41*4882a593Smuzhiyun };
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun static const cs5536_pci_vsm_read vsm_conf_read[] = {
44*4882a593Smuzhiyun [CS5536_ISA_FUNC] = pci_isa_read_reg,
45*4882a593Smuzhiyun [reserved_func] = NULL,
46*4882a593Smuzhiyun [CS5536_IDE_FUNC] = pci_ide_read_reg,
47*4882a593Smuzhiyun [CS5536_ACC_FUNC] = pci_acc_read_reg,
48*4882a593Smuzhiyun [CS5536_OHCI_FUNC] = pci_ohci_read_reg,
49*4882a593Smuzhiyun [CS5536_EHCI_FUNC] = pci_ehci_read_reg,
50*4882a593Smuzhiyun };
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun /*
53*4882a593Smuzhiyun * write to PCI config space and transfer it to MSR write.
54*4882a593Smuzhiyun */
cs5536_pci_conf_write4(int function,int reg,u32 value)55*4882a593Smuzhiyun void cs5536_pci_conf_write4(int function, int reg, u32 value)
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
58*4882a593Smuzhiyun return;
59*4882a593Smuzhiyun if ((reg < 0) || (reg > 0x100) || ((reg & 0x03) != 0))
60*4882a593Smuzhiyun return;
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun if (vsm_conf_write[function] != NULL)
63*4882a593Smuzhiyun vsm_conf_write[function](reg, value);
64*4882a593Smuzhiyun }
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun /*
67*4882a593Smuzhiyun * read PCI config space and transfer it to MSR access.
68*4882a593Smuzhiyun */
cs5536_pci_conf_read4(int function,int reg)69*4882a593Smuzhiyun u32 cs5536_pci_conf_read4(int function, int reg)
70*4882a593Smuzhiyun {
71*4882a593Smuzhiyun u32 data = 0;
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
74*4882a593Smuzhiyun return 0;
75*4882a593Smuzhiyun if ((reg < 0) || ((reg & 0x03) != 0))
76*4882a593Smuzhiyun return 0;
77*4882a593Smuzhiyun if (reg > 0x100)
78*4882a593Smuzhiyun return 0xffffffff;
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun if (vsm_conf_read[function] != NULL)
81*4882a593Smuzhiyun data = vsm_conf_read[function](reg);
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun return data;
84*4882a593Smuzhiyun }
85