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
|
// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2002
* Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
*/
/*
* SPI Read/Write Utilities
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <errno.h>
#include <spi.h>
/*-----------------------------------------------------------------------
* Definitions
*/
#ifndef MAX_SPI_BYTES
# define MAX_SPI_BYTES 32 /* Maximum number of bytes we can handle */
#endif
/*
* Values from last command.
*/
static unsigned int bus;
static unsigned int cs;
static unsigned int mode;
static unsigned int freq;
static int bitlen;
static uchar dout[MAX_SPI_BYTES];
static uchar din[MAX_SPI_BYTES];
static int do_spi_xfer(int bus, int cs)
{
struct spi_slave *slave;
int ret = 0;
#ifdef CONFIG_DM_SPI
char name[30], *str;
struct udevice *dev;
snprintf(name, sizeof(name), "generic_%d:%d", bus, cs);
str = strdup(name);
if (!str)
return -ENOMEM;
ret = spi_get_bus_and_cs(bus, cs, freq, mode, "spi_generic_drv",
str, &dev, &slave);
if (ret)
return ret;
#else
slave = spi_setup_slave(bus, cs, freq, mode);
if (!slave) {
printf("Invalid device %d:%d\n", bus, cs);
return -EINVAL;
}
#endif
ret = spi_claim_bus(slave);
if (ret)
goto done;
ret = spi_xfer(slave, bitlen, dout, din,
SPI_XFER_BEGIN | SPI_XFER_END);
#ifndef CONFIG_DM_SPI
/* We don't get an error code in this case */
if (ret)
ret = -EIO;
#endif
if (ret) {
printf("Error %d during SPI transaction\n", ret);
} else {
int j;
for (j = 0; j < ((bitlen + 7) / 8); j++)
printf("%02X", din[j]);
printf("\n");
}
done:
spi_release_bus(slave);
#ifndef CONFIG_DM_SPI
spi_free_slave(slave);
#endif
return ret;
}
/*
* SPI read/write
*
* Syntax:
* spi {dev} {num_bits} {dout}
* {dev} is the device number for controlling chip select (see TBD)
* {num_bits} is the number of bits to send & receive (base 10)
* {dout} is a hexadecimal string of data to send
* The command prints out the hexadecimal string received via SPI.
*/
int do_spi(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
char *cp = 0;
uchar tmp;
int j;
/*
* We use the last specified parameters, unless new ones are
* entered.
*/
if (freq == 0)
freq = 1000000;
if ((flag & CMD_FLAG_REPEAT) == 0)
{
if (argc >= 2) {
mode = CONFIG_DEFAULT_SPI_MODE;
bus = simple_strtoul(argv[1], &cp, 10);
if (*cp == ':') {
cs = simple_strtoul(cp+1, &cp, 10);
} else {
cs = bus;
bus = CONFIG_DEFAULT_SPI_BUS;
}
if (*cp == '.')
mode = simple_strtoul(cp+1, &cp, 10);
if (*cp == '@')
freq = simple_strtoul(cp+1, &cp, 10);
}
if (argc >= 3)
bitlen = simple_strtoul(argv[2], NULL, 10);
if (argc >= 4) {
cp = argv[3];
for(j = 0; *cp; j++, cp++) {
tmp = *cp - '0';
if(tmp > 9)
tmp -= ('A' - '0') - 10;
if(tmp > 15)
tmp -= ('a' - 'A');
if(tmp > 15) {
printf("Hex conversion error on %c\n", *cp);
return 1;
}
if((j % 2) == 0)
dout[j / 2] = (tmp << 4);
else
dout[j / 2] |= tmp;
}
}
}
if ((bitlen < 0) || (bitlen > (MAX_SPI_BYTES * 8))) {
printf("Invalid bitlen %d\n", bitlen);
return 1;
}
if (do_spi_xfer(bus, cs))
return 1;
return 0;
}
/***************************************************/
U_BOOT_CMD(
sspi, 5, 1, do_spi,
"SPI utility command",
"[<bus>:]<cs>[.<mode>][@<freq>] <bit_len> <dout> - Send and receive bits\n"
"<bus> - Identifies the SPI bus\n"
"<cs> - Identifies the chip select\n"
"<mode> - Identifies the SPI mode to use\n"
"<freq> - Identifies the SPI bus frequency in Hz\n"
"<bit_len> - Number of bits to send (base 10)\n"
"<dout> - Hexadecimal string that gets sent"
);
|
