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
|
// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
/*
* LPC operations through debugfs interface
*
* Copyright 2014-2018 IBM Corp.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <byteswap.h>
#include <stdint.h>
#include <stdbool.h>
#include <getopt.h>
#include <limits.h>
#include <arpa/inet.h>
#include <assert.h>
#include <endian.h>
#include <byteswap.h>
#define SYSFS_PREFIX "/sys/kernel/debug/powerpc/lpc"
int main(int argc, char *argv[])
{
char path[256];
char *dot;
char *eq;
int fd, size = 4;
bool do_write = false;
bool big_endian = false;
uint32_t addr, val;
ssize_t rc;
if (argc < 3) {
printf("Usage: %s <space> <addr>[.lLwWbBd[,size]][=value]\n", argv[0]);
return 0;
}
eq = strchr(argv[2], '=');
if (eq) {
do_write = true;
val = strtoul(eq + 1, NULL, 0);
*eq = 0;
}
dot = strchr(argv[2], '.');
if (dot) {
*(dot++) = 0;
switch(*dot) {
case 'L':
big_endian = true;
case 'l':
break;
case 'W':
big_endian = true;
case 'w':
size = 2;
break;
case 'B':
big_endian = true;
case 'b':
size = 1;
break;
default:
fprintf(stderr, "Invalid size specifier\n");
exit(1);
}
}
addr = strtoul(argv[2], NULL, 0);
memset(path, 0, sizeof(path));
snprintf(path, 255, SYSFS_PREFIX "/%s", argv[1]);
fd = open(path, O_RDWR);
if (fd < 0) {
perror("Failed to open sysfs file");
exit(1);
}
lseek(fd, addr, SEEK_SET);
if (do_write) {
uint8_t v8;
uint16_t v16;
uint32_t v32;
switch(size) {
case 1:
val &= 0xff;
v8 = val;
rc = write(fd, &v8, 1);
if (rc != 1) {
perror("Failed to write to LPC");
exit(1);
}
printf("[%s] W 0x%08x.%c=0x%02x\n",
argv[1], addr, big_endian ? 'B' : 'b', val);
break;
case 2:
val &= 0xffff;
#if __BYTE_ORDER == __LITTLE_ENDIAN
v16 = big_endian ? bswap_16(val) : val;
#else
v16 = big_endian ? val : bswap_16(val);
#endif
rc = write(fd, &v16, 2);
if (rc != 2) {
perror("Failed to write to LPC");
exit(1);
}
printf("[%s] W 0x%08x.%c=0x%04x\n",
argv[1], addr, big_endian ? 'W' : 'w', val);
break;
default:
#if __BYTE_ORDER == __LITTLE_ENDIAN
v32 = big_endian ? bswap_32(val) : val;
#else
v32 = big_endian ? val : bswap_32(val);
#endif
rc = write(fd, &v32, 4);
if (rc != 4) {
perror("Failed to write to LPC");
exit(1);
}
printf("[%s] W 0x%08x.%c=0x%08x\n",
argv[1], addr, big_endian ? 'L' : 'l', val);
break;
}
} else {
uint8_t v8;
uint16_t v16;
uint32_t v32;
switch(size) {
case 1:
rc = read(fd, &v8, 1);
if (rc != 1) {
perror("Failed to read from LPC");
exit(1);
}
printf("[%s] R 0x%08x.%c=0x%02x\n", argv[1], addr,
big_endian ? 'B' : 'b', v8);
break;
case 2:
rc = read(fd, &v16, 2);
if (rc != 2) {
perror("Failed to read from LPC");
exit(1);
}
#if __BYTE_ORDER == __LITTLE_ENDIAN
v16 = big_endian ? bswap_16(v16) : v16;
#else
v16 = big_endian ? v16 : bswap_16(v16);
#endif
printf("[%s] R 0x%08x.%c=0x%04x\n", argv[1], addr,
big_endian ? 'W' : 'w', v16);
break;
default:
rc = read(fd, &v32, 4);
if (rc != 4) {
perror("Failed to read from LPC");
exit(1);
}
#if __BYTE_ORDER == __LITTLE_ENDIAN
v32 = big_endian ? bswap_32(v32) : v32;
#else
v32 = big_endian ? v32 : bswap_32(v32);
#endif
printf("[%s] R 0x%08x.%c=0x%08x\n", argv[1], addr,
big_endian ? 'L' : 'l', v32);
break;
}
}
return 0;
}
|
