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
|
/*
* atmel_df_pow2.c - convert Atmel Dataflashes to Power of 2 mode
*
* Copyright 2009 Analog Devices Inc.
*
* Licensed under the 2-clause BSD.
*/
#include <common.h>
#include <exports.h>
#include <spi.h>
#define CMD_ID 0x9f
#define CMD_STAT 0xd7
#define CMD_CFG 0x3d
static int flash_cmd(struct spi_slave *slave, uchar cmd, uchar *buf, int len)
{
buf[0] = cmd;
return spi_xfer(slave, 8 * len, buf, buf, SPI_XFER_BEGIN | SPI_XFER_END);
}
static int flash_status(struct spi_slave *slave)
{
uchar buf[2];
if (flash_cmd(slave, CMD_STAT, buf, sizeof(buf)))
return -1;
return buf[1];
}
static int flash_set_pow2(struct spi_slave *slave)
{
int ret;
uchar buf[4];
buf[1] = 0x2a;
buf[2] = 0x80;
buf[3] = 0xa6;
ret = flash_cmd(slave, CMD_CFG, buf, sizeof(buf));
if (ret)
return ret;
/* wait Tp, or 6 msec */
udelay(6000);
ret = flash_status(slave);
if (ret == -1)
return 1;
return ret & 0x1 ? 0 : 1;
}
static int flash_check(struct spi_slave *slave)
{
int ret;
uchar buf[4];
ret = flash_cmd(slave, CMD_ID, buf, sizeof(buf));
if (ret)
return ret;
if (buf[1] != 0x1F) {
printf("atmel flash not found (id[0] = %#x)\n", buf[1]);
return 1;
}
if ((buf[2] >> 5) != 0x1) {
printf("AT45 flash not found (id[0] = %#x)\n", buf[2]);
return 2;
}
return 0;
}
static char *getline(void)
{
static char buffer[100];
char c;
size_t i;
i = 0;
while (1) {
buffer[i] = '\0';
c = getc();
switch (c) {
case '\r': /* Enter/Return key */
case '\n':
puts("\n");
return buffer;
case 0x03: /* ^C - break */
return NULL;
case 0x5F:
case 0x08: /* ^H - backspace */
case 0x7F: /* DEL - backspace */
if (i) {
puts("\b \b");
i--;
}
break;
default:
/* Ignore control characters */
if (c < 0x20)
break;
/* Queue up all other characters */
buffer[i++] = c;
printf("%c", c);
break;
}
}
}
int atmel_df_pow2(int argc, char *const argv[])
{
/* Print the ABI version */
app_startup(argv);
if (XF_VERSION != get_version()) {
printf("Expects ABI version %d\n", XF_VERSION);
printf("Actual U-Boot ABI version %lu\n", get_version());
printf("Can't run\n\n");
return 1;
}
while (1) {
struct spi_slave *slave;
char *line, *p;
int bus, cs, status;
puts("\nenter the [BUS:]CS of the SPI flash: ");
line = getline();
/* CTRL+C */
if (!line)
return 0;
if (line[0] == '\0')
continue;
bus = cs = simple_strtoul(line, &p, 10);
if (*p) {
if (*p == ':') {
++p;
cs = simple_strtoul(p, &p, 10);
}
if (*p) {
puts("invalid format, please try again\n");
continue;
}
} else
bus = 0;
printf("\ngoing to work with dataflash at %i:%i\n", bus, cs);
/* use a low speed -- it'll work with all devices, and
* speed here doesn't really matter.
*/
slave = spi_setup_slave(bus, cs, 1000, SPI_MODE_3);
if (!slave) {
puts("unable to setup slave\n");
continue;
}
if (spi_claim_bus(slave)) {
spi_free_slave(slave);
continue;
}
if (flash_check(slave)) {
puts("no flash found\n");
goto done;
}
status = flash_status(slave);
if (status == -1) {
puts("unable to read status register\n");
goto done;
}
if (status & 0x1) {
puts("flash is already in power-of-2 mode!\n");
goto done;
}
puts("are you sure you wish to set power-of-2 mode?\n");
puts("this operation is permanent and irreversible\n");
printf("enter YES to continue: ");
line = getline();
if (!line || strcmp(line, "YES"))
goto done;
if (flash_set_pow2(slave)) {
puts("setting pow2 mode failed\n");
goto done;
}
puts(
"Configuration should be updated now. You will have to\n"
"power cycle the part in order to finish the conversion.\n"
);
done:
spi_release_bus(slave);
spi_free_slave(slave);
}
}
|
