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
|
/*
* SPI flash interface
*
* Copyright (C) 2008 Atmel Corporation
*/
#include <common.h>
#include <malloc.h>
#include <spi.h>
#include <spi_flash.h>
#include "spi_flash_internal.h"
int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len)
{
unsigned long flags = SPI_XFER_BEGIN;
int ret;
if (len == 0)
flags |= SPI_XFER_END;
ret = spi_xfer(spi, 8, &cmd, NULL, flags);
if (ret) {
debug("SF: Failed to send command %02x: %d\n", cmd, ret);
return ret;
}
if (len) {
ret = spi_xfer(spi, len * 8, NULL, response, SPI_XFER_END);
if (ret)
debug("SF: Failed to read response (%zu bytes): %d\n",
len, ret);
}
return ret;
}
int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd,
size_t cmd_len, void *data, size_t data_len)
{
unsigned long flags = SPI_XFER_BEGIN;
int ret;
if (data_len == 0)
flags |= SPI_XFER_END;
ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags);
if (ret) {
debug("SF: Failed to send read command (%zu bytes): %d\n",
cmd_len, ret);
} else if (data_len != 0) {
ret = spi_xfer(spi, data_len * 8, NULL, data, SPI_XFER_END);
if (ret)
debug("SF: Failed to read %zu bytes of data: %d\n",
data_len, ret);
}
return ret;
}
int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len,
const void *data, size_t data_len)
{
unsigned long flags = SPI_XFER_BEGIN;
int ret;
if (data_len == 0)
flags |= SPI_XFER_END;
ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags);
if (ret) {
debug("SF: Failed to send read command (%zu bytes): %d\n",
cmd_len, ret);
} else if (data_len != 0) {
ret = spi_xfer(spi, data_len * 8, data, NULL, SPI_XFER_END);
if (ret)
debug("SF: Failed to read %zu bytes of data: %d\n",
data_len, ret);
}
return ret;
}
int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
size_t cmd_len, void *data, size_t data_len)
{
struct spi_slave *spi = flash->spi;
int ret;
spi_claim_bus(spi);
ret = spi_flash_cmd_read(spi, cmd, cmd_len, data, data_len);
spi_release_bus(spi);
return ret;
}
struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int spi_mode)
{
struct spi_slave *spi;
struct spi_flash *flash;
int ret;
u8 idcode[3];
spi = spi_setup_slave(bus, cs, max_hz, spi_mode);
if (!spi) {
debug("SF: Failed to set up slave\n");
return NULL;
}
ret = spi_claim_bus(spi);
if (ret) {
debug("SF: Failed to claim SPI bus: %d\n", ret);
goto err_claim_bus;
}
/* Read the ID codes */
ret = spi_flash_cmd(spi, CMD_READ_ID, &idcode, sizeof(idcode));
if (ret)
goto err_read_id;
debug("SF: Got idcode %02x %02x %02x\n", idcode[0],
idcode[1], idcode[2]);
switch (idcode[0]) {
#ifdef CONFIG_SPI_FLASH_SPANSION
case 0x01:
flash = spi_flash_probe_spansion(spi, idcode);
break;
#endif
#ifdef CONFIG_SPI_FLASH_ATMEL
case 0x1F:
flash = spi_flash_probe_atmel(spi, idcode);
break;
#endif
#ifdef CONFIG_SPI_FLASH_WINBOND
case 0xef:
flash = spi_flash_probe_winbond(spi, idcode);
break;
#endif
#ifdef CONFIG_SPI_FLASH_STMICRO
case 0x00:
case 0xff:
flash = spi_flash_probe_stmicro(spi, idcode);
break;
#endif
default:
debug("SF: Unsupported manufacturer %02X\n", idcode[0]);
flash = NULL;
break;
}
if (!flash)
goto err_manufacturer_probe;
spi_release_bus(spi);
return flash;
err_manufacturer_probe:
err_read_id:
spi_release_bus(spi);
err_claim_bus:
spi_free_slave(spi);
return NULL;
}
void spi_flash_free(struct spi_flash *flash)
{
spi_free_slave(flash->spi);
free(flash);
}
|
