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
|
/* Driver Manager Driver Translate Interface Implementation
*
* COPYRIGHT (c) 2010.
* Cobham Gaisler AB.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
/*
* Used by device drivers. The functions rely on that the parent bus driver
* has implemented the neccessary operations correctly.
*
* The translate functions are used to translate addresses between buses
* for DMA cores located on a "remote" bus, or for memory-mapped obtaining
* an address that can be used to access an remote bus.
*
* For example, PCI I/O might be memory-mapped at the PCI Host bridge,
* say address 0xfff10000-0xfff1ffff is mapped to the PCI I/O address
* of 0x00000000-0x0000ffff. The PCI Host bridge driver may then set up
* a map so that a driver that get PCI address 0x100 can translate that
* into 0xfff10100.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <drvmgr/drvmgr.h>
#include "drvmgr_internal.h"
unsigned int drvmgr_translate_bus(
struct drvmgr_bus *from,
struct drvmgr_bus *to,
int reverse,
void *src_address,
void **dst_address)
{
struct drvmgr_bus *path[16];
int dir, levels, i;
void *dst, *from_adr, *to_adr;
struct drvmgr_map_entry *map;
struct drvmgr_bus *bus;
unsigned int sz;
struct drvmgr_bus *bus_bot, *bus_top;
dst = src_address;
sz = 0xffffffff;
if (from == to) /* no need translating addresses when on same bus */
goto out;
/* Always find translation path from remote bus towards root bus. All
* buses have root bus has parent at some level
*/
if (from->depth > to->depth) {
bus_bot = from;
bus_top = to;
dir = 0;
} else {
bus_bot = to;
bus_top = from;
dir = 1;
}
levels = bus_bot->depth - bus_top->depth;
if (levels >= 16)
return 0; /* Does not support such a big depth */
i = 0;
while ((bus_bot != NULL) && bus_bot != bus_top) {
if (dir)
path[(levels - 1) - i] = bus_bot;
else
path[i] = bus_bot;
i++;
bus_bot = bus_bot->dev->parent;
}
if (bus_bot == NULL)
return 0; /* from -> to is not linearly connected */
for (i = 0; i < levels; i++) {
bus = path[i];
if ((dir && reverse) || (!dir && !reverse))
map = bus->maps_up;
else
map = bus->maps_down;
if (map == NULL)
continue; /* No translation needed - 1:1 mapping */
if (map == DRVMGR_TRANSLATE_NO_BRIDGE) {
sz = 0;
break; /* No bridge interface in this direction */
}
while (map->size != 0) {
if (reverse) {
/* Opposite direction */
from_adr = map->to_adr;
to_adr = map->from_adr;
} else {
from_adr = map->from_adr;
to_adr = map->to_adr;
}
if ((dst >= from_adr) &&
(dst <= (from_adr + (map->size - 1)))) {
if (((from_adr + (map->size - 1)) - dst) < sz)
sz = (from_adr + (map->size - 1)) - dst;
dst = (dst - from_adr) + to_adr;
break;
}
map++;
}
/* quit if no matching translation information */
if (map->size == 0) {
sz = 0;
break;
}
}
out:
if (dst_address)
*dst_address = dst;
return sz;
}
unsigned int drvmgr_translate(
struct drvmgr_dev *dev,
unsigned int options,
void *src_address,
void **dst_address)
{
struct drvmgr_bus *to, *from;
int rev = 0;
rev = (~options) & 1;
if ((options == CPUMEM_TO_DMA) || (options == DMAMEM_FROM_CPU)) {
from = drv_mgr.root_dev.bus;
to = dev->parent;
} else { /* CPUMEM_FROM_DMA || DMAMEM_TO_CPU */
from = dev->parent;
to = drv_mgr.root_dev.bus;
}
return drvmgr_translate_bus(from, to, rev, src_address, dst_address);
}
|
