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
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/**
* @file
*
* PCI Support when Configuration Space is in I/O
*/
/*
* COPYRIGHT (c) 2016.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <rtems.h>
#include <bsp.h>
#include <bsp/bspimpl.h>
static int pci_io_initialized = 0;
/*
* Forward reference. Initialized at bottom.
*/
static const pci_config_access_functions pci_io_indirect_functions;
/*
* Detects presense of PCI Configuration is in I/O space. If so, return
* pointer to accessor methods.
*
* NOTE: TBD to determine if (a) PCI Bus exists and (b) this is the
* access method.
*/
const pci_config_access_functions *pci_io_initialize(void)
{
pci_io_initialized = 1;
printk( "PCI I/O Support Initialized\n" );
return &pci_io_indirect_functions;
}
/*
* Build PCI Address
*/
static inline uint32_t pci_io_build_address(
uint16_t bus,
uint16_t slot,
uint16_t function,
uint16_t offset
)
{
uint32_t bus_u32 = (uint32_t)bus;
uint32_t slot_u32 = (uint32_t)slot;
uint32_t function_u32 = (uint32_t)function;
uint32_t address;
/*
* create configuration address as per figure at
* http://wiki.osdev.org/PCI#Configuration_Space_Access_Mechanism_.231
*/
address = (uint32_t) 0x80000000; /* Bit 31 - Enable Bit */
/* Bits 30-24 - Reserved */
address |= bus_u32 << 16; /* Bits 23-16 - Bus Number */
address |= slot_u32 << 11; /* Bits 15-11 - Device/Slot Number */
address |= function_u32 << 8; /* Bits 10-8 - Function Number */
address |= offset & 0xfc; /* Bits 7-2 - Offset/Register Number */
/* Bits 1-0 - Reserved 0 */
return address;
}
static int BSP_pci_read_config_byte(
unsigned char bus,
unsigned char slot,
unsigned char function,
unsigned char offset,
unsigned char *value
)
{
uint32_t address;
uint32_t tmp;
address = pci_io_build_address( bus, slot, function, offset );
/* write out the address */
outport_long(0xCF8, address);
/* read in the data */
inport_long(0xCFC, tmp);
/* (offset & 3) * 8) = 0 will choose the first byte of the 32 bits register */
*value = (uint16_t)(tmp >> ((offset & 3) * 8)) & 0xff;
return PCIBIOS_SUCCESSFUL;
}
static int BSP_pci_read_config_word(
unsigned char bus,
unsigned char slot,
unsigned char function,
unsigned char offset,
unsigned short *value
)
{
uint32_t address;
uint32_t tmp;
address = pci_io_build_address( bus, slot, function, offset );
/* write out the address */
outport_long(0xCF8, address);
/* read in the data */
inport_long(0xCFC, tmp);
/* (offset & 2) * 8) = 0 will choose the first word of the 32 bits register */
*value = (uint16_t)(tmp >> ((offset & 2) * 8)) & 0xffff;
return PCIBIOS_SUCCESSFUL;
}
static int BSP_pci_read_config_dword(
unsigned char bus,
unsigned char slot,
unsigned char function,
unsigned char offset,
uint32_t *value
)
{
uint32_t address;
uint32_t tmp;
address = pci_io_build_address( bus, slot, function, offset );
/* write out the address */
outport_long(0xCF8, address);
/* read in the data */
inport_long(0xCFC, tmp);
*value = tmp;
return PCIBIOS_SUCCESSFUL;
}
static int BSP_pci_write_config_byte(
unsigned char bus,
unsigned char slot,
unsigned char function,
unsigned char offset,
unsigned char value
)
{
uint32_t address;
address = pci_io_build_address( bus, slot, function, offset );
/* write out the address */
outport_long(0xCF8, address);
/* read in the data */
outport_byte(0xCFC, value);
return PCIBIOS_SUCCESSFUL;
}
static int BSP_pci_write_config_word(
unsigned char bus,
unsigned char slot,
unsigned char function,
unsigned char offset,
unsigned short value
)
{
uint32_t address;
address = pci_io_build_address( bus, slot, function, offset );
/* write out the address */
outport_long(0xCF8, address);
/* read in the data */
outport_word(0xCFC, value);
return PCIBIOS_SUCCESSFUL;
}
static int BSP_pci_write_config_dword(
unsigned char bus,
unsigned char slot,
unsigned char function,
unsigned char offset,
uint32_t value
)
{
uint32_t address;
address = pci_io_build_address( bus, slot, function, offset );
/* write out the address */
outport_long(0xCF8, address);
/* read in the data */
outport_long(0xCFC, value);
return PCIBIOS_SUCCESSFUL;
}
static const pci_config_access_functions pci_io_indirect_functions = {
BSP_pci_read_config_byte,
BSP_pci_read_config_word,
BSP_pci_read_config_dword,
BSP_pci_write_config_byte,
BSP_pci_write_config_word,
BSP_pci_write_config_dword
};
|
