1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2002
4 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
5 */
6
7 /*
8 * SPI Read/Write Utilities
9 */
10
11 #include <common.h>
12 #include <command.h>
13 #include <dm.h>
14 #include <errno.h>
15 #include <spi.h>
16
17 /*-----------------------------------------------------------------------
18 * Definitions
19 */
20
21 #ifndef MAX_SPI_BYTES
22 # define MAX_SPI_BYTES 32 /* Maximum number of bytes we can handle */
23 #endif
24
25 /*
26 * Values from last command.
27 */
28 static unsigned int bus;
29 static unsigned int cs;
30 static unsigned int mode;
31 static int bitlen;
32 static uchar dout[MAX_SPI_BYTES];
33 static uchar din[MAX_SPI_BYTES];
34
do_spi_xfer(int bus,int cs)35 static int do_spi_xfer(int bus, int cs)
36 {
37 struct spi_slave *slave;
38 int ret = 0;
39
40 #ifdef CONFIG_DM_SPI
41 char name[30], *str;
42 struct udevice *dev;
43
44 snprintf(name, sizeof(name), "generic_%d:%d", bus, cs);
45 str = strdup(name);
46 if (!str)
47 return -ENOMEM;
48 ret = spi_get_bus_and_cs(bus, cs, 1000000, mode, "spi_generic_drv",
49 str, &dev, &slave);
50 if (ret)
51 return ret;
52 #else
53 slave = spi_setup_slave(bus, cs, 1000000, mode);
54 if (!slave) {
55 printf("Invalid device %d:%d\n", bus, cs);
56 return -EINVAL;
57 }
58 #endif
59
60 ret = spi_claim_bus(slave);
61 if (ret)
62 goto done;
63 ret = spi_xfer(slave, bitlen, dout, din,
64 SPI_XFER_BEGIN | SPI_XFER_END);
65 #ifndef CONFIG_DM_SPI
66 /* We don't get an error code in this case */
67 if (ret)
68 ret = -EIO;
69 #endif
70 if (ret) {
71 printf("Error %d during SPI transaction\n", ret);
72 } else {
73 int j;
74
75 for (j = 0; j < ((bitlen + 7) / 8); j++)
76 printf("%02X", din[j]);
77 printf("\n");
78 }
79 done:
80 spi_release_bus(slave);
81 #ifndef CONFIG_DM_SPI
82 spi_free_slave(slave);
83 #endif
84
85 return ret;
86 }
87
88 /*
89 * SPI read/write
90 *
91 * Syntax:
92 * spi {dev} {num_bits} {dout}
93 * {dev} is the device number for controlling chip select (see TBD)
94 * {num_bits} is the number of bits to send & receive (base 10)
95 * {dout} is a hexadecimal string of data to send
96 * The command prints out the hexadecimal string received via SPI.
97 */
98
do_spi(cmd_tbl_t * cmdtp,int flag,int argc,char * const argv[])99 int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
100 {
101 char *cp = 0;
102 uchar tmp;
103 int j;
104
105 /*
106 * We use the last specified parameters, unless new ones are
107 * entered.
108 */
109
110 if ((flag & CMD_FLAG_REPEAT) == 0)
111 {
112 if (argc >= 2) {
113 mode = CONFIG_DEFAULT_SPI_MODE;
114 bus = simple_strtoul(argv[1], &cp, 10);
115 if (*cp == ':') {
116 cs = simple_strtoul(cp+1, &cp, 10);
117 } else {
118 cs = bus;
119 bus = CONFIG_DEFAULT_SPI_BUS;
120 }
121 if (*cp == '.')
122 mode = simple_strtoul(cp+1, NULL, 10);
123 }
124 if (argc >= 3)
125 bitlen = simple_strtoul(argv[2], NULL, 10);
126 if (argc >= 4) {
127 cp = argv[3];
128 for(j = 0; *cp; j++, cp++) {
129 tmp = *cp - '0';
130 if(tmp > 9)
131 tmp -= ('A' - '0') - 10;
132 if(tmp > 15)
133 tmp -= ('a' - 'A');
134 if(tmp > 15) {
135 printf("Hex conversion error on %c\n", *cp);
136 return 1;
137 }
138 if((j % 2) == 0)
139 dout[j / 2] = (tmp << 4);
140 else
141 dout[j / 2] |= tmp;
142 }
143 }
144 }
145
146 if ((bitlen < 0) || (bitlen > (MAX_SPI_BYTES * 8))) {
147 printf("Invalid bitlen %d\n", bitlen);
148 return 1;
149 }
150
151 if (do_spi_xfer(bus, cs))
152 return 1;
153
154 return 0;
155 }
156
157 /***************************************************/
158
159 U_BOOT_CMD(
160 sspi, 5, 1, do_spi,
161 "SPI utility command",
162 "[<bus>:]<cs>[.<mode>] <bit_len> <dout> - Send and receive bits\n"
163 "<bus> - Identifies the SPI bus\n"
164 "<cs> - Identifies the chip select\n"
165 "<mode> - Identifies the SPI mode to use\n"
166 "<bit_len> - Number of bits to send (base 10)\n"
167 "<dout> - Hexadecimal string that gets sent"
168 );
169