1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <asm/addrspace.h>
#include <linux/vmalloc.h>
#include <ifxmips.h>
#include <ifxmips_irq.h>
#include <ifxmips_ebu.h>
#define IFXMIPS_PCI_CFG_BUSNUM_SHF 16
#define IFXMIPS_PCI_CFG_DEVNUM_SHF 11
#define IFXMIPS_PCI_CFG_FUNNUM_SHF 8
#define PCI_ACCESS_READ 0
#define PCI_ACCESS_WRITE 1
extern u32 ifxmips_pci_mapped_cfg;
static int
ifxmips_pci_config_access(unsigned char access_type,
struct pci_bus *bus, unsigned int devfn, unsigned int where, u32 *data)
{
unsigned long cfg_base;
unsigned long flags;
u32 temp;
/* IFXMips support slot from 0 to 15 */
/* dev_fn 0&0x68 (AD29) is ifxmips itself */
if ((bus->number != 0) || ((devfn & 0xf8) > 0x78)
|| ((devfn & 0xf8) == 0) || ((devfn & 0xf8) == 0x68))
return 1;
spin_lock_irqsave(&ebu_lock, flags);
cfg_base = ifxmips_pci_mapped_cfg;
cfg_base |= (bus->number << IFXMIPS_PCI_CFG_BUSNUM_SHF) | (devfn <<
IFXMIPS_PCI_CFG_FUNNUM_SHF) | (where & ~0x3);
/* Perform access */
if (access_type == PCI_ACCESS_WRITE)
{
#ifdef CONFIG_SWAP_IO_SPACE
ifxmips_w32(swab32(*data), ((u32*)cfg_base));
#else
ifxmips_w32(*data, ((u32*)cfg_base));
#endif
} else {
*data = ifxmips_r32(((u32*)(cfg_base)));
#ifdef CONFIG_SWAP_IO_SPACE
*data = swab32(*data);
#endif
}
wmb();
/* clean possible Master abort */
cfg_base = (ifxmips_pci_mapped_cfg | (0x0 << IFXMIPS_PCI_CFG_FUNNUM_SHF)) + 4;
temp = ifxmips_r32(((u32*)(cfg_base)));
#ifdef CONFIG_SWAP_IO_SPACE
temp = swab32 (temp);
#endif
cfg_base = (ifxmips_pci_mapped_cfg | (0x68 << IFXMIPS_PCI_CFG_FUNNUM_SHF)) + 4;
ifxmips_w32(temp, ((u32*)cfg_base));
spin_unlock_irqrestore(&ebu_lock, flags);
if (((*data) == 0xffffffff) && (access_type == PCI_ACCESS_READ))
return 1;
return 0;
}
int
ifxmips_pci_read_config_dword(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 * val)
{
u32 data = 0;
if (ifxmips_pci_config_access(PCI_ACCESS_READ, bus, devfn, where, &data))
return PCIBIOS_DEVICE_NOT_FOUND;
if (size == 1)
*val = (data >> ((where & 3) << 3)) & 0xff;
else if (size == 2)
*val = (data >> ((where & 3) << 3)) & 0xffff;
else
*val = data;
return PCIBIOS_SUCCESSFUL;
}
int
ifxmips_pci_write_config_dword(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 val)
{
u32 data = 0;
if (size == 4)
{
data = val;
} else {
if (ifxmips_pci_config_access(PCI_ACCESS_READ, bus, devfn, where, &data))
return PCIBIOS_DEVICE_NOT_FOUND;
if (size == 1)
data = (data & ~(0xff << ((where & 3) << 3))) |
(val << ((where & 3) << 3));
else if (size == 2)
data = (data & ~(0xffff << ((where & 3) << 3))) |
(val << ((where & 3) << 3));
}
if (ifxmips_pci_config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data))
return PCIBIOS_DEVICE_NOT_FOUND;
return PCIBIOS_SUCCESSFUL;
}
|
