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1 | /* | |
2 | * (C) Copyright 2002 | |
3 | * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com | |
4 | * | |
5 | * SPDX-License-Identifier: GPL-2.0+ | |
6 | */ | |
7 | ||
8 | /* | |
9 | * SPI Read/Write Utilities | |
10 | */ | |
11 | ||
12 | #include <common.h> | |
13 | #include <command.h> | |
14 | #include <dm.h> | |
15 | #include <errno.h> | |
16 | #include <spi.h> | |
17 | ||
18 | /*----------------------------------------------------------------------- | |
19 | * Definitions | |
20 | */ | |
21 | ||
22 | #ifndef MAX_SPI_BYTES | |
23 | # define MAX_SPI_BYTES 32 /* Maximum number of bytes we can handle */ | |
24 | #endif | |
25 | ||
26 | #ifndef CONFIG_DEFAULT_SPI_BUS | |
27 | # define CONFIG_DEFAULT_SPI_BUS 0 | |
28 | #endif | |
29 | #ifndef CONFIG_DEFAULT_SPI_MODE | |
30 | # define CONFIG_DEFAULT_SPI_MODE SPI_MODE_0 | |
31 | #endif | |
32 | ||
33 | /* | |
34 | * Values from last command. | |
35 | */ | |
36 | static unsigned int bus; | |
37 | static unsigned int cs; | |
38 | static unsigned int mode; | |
39 | static int bitlen; | |
40 | static uchar dout[MAX_SPI_BYTES]; | |
41 | static uchar din[MAX_SPI_BYTES]; | |
42 | ||
43 | static int do_spi_xfer(int bus, int cs) | |
44 | { | |
45 | struct spi_slave *slave; | |
46 | int ret = 0; | |
47 | ||
48 | #ifdef CONFIG_DM_SPI | |
49 | char name[30], *str; | |
50 | struct udevice *dev; | |
51 | ||
52 | snprintf(name, sizeof(name), "generic_%d:%d", bus, cs); | |
53 | str = strdup(name); | |
54 | if (!str) | |
55 | return -ENOMEM; | |
56 | ret = spi_get_bus_and_cs(bus, cs, 1000000, mode, "spi_generic_drv", | |
57 | str, &dev, &slave); | |
58 | if (ret) | |
59 | return ret; | |
60 | #else | |
61 | slave = spi_setup_slave(bus, cs, 1000000, mode); | |
62 | if (!slave) { | |
63 | printf("Invalid device %d:%d\n", bus, cs); | |
64 | return -EINVAL; | |
65 | } | |
66 | #endif | |
67 | ||
68 | ret = spi_claim_bus(slave); | |
69 | if (ret) | |
70 | goto done; | |
71 | ret = spi_xfer(slave, bitlen, dout, din, | |
72 | SPI_XFER_BEGIN | SPI_XFER_END); | |
73 | #ifndef CONFIG_DM_SPI | |
74 | /* We don't get an error code in this case */ | |
75 | if (ret) | |
76 | ret = -EIO; | |
77 | #endif | |
78 | if (ret) { | |
79 | printf("Error %d during SPI transaction\n", ret); | |
80 | } else { | |
81 | int j; | |
82 | ||
83 | for (j = 0; j < ((bitlen + 7) / 8); j++) | |
84 | printf("%02X", din[j]); | |
85 | printf("\n"); | |
86 | } | |
87 | done: | |
88 | spi_release_bus(slave); | |
89 | #ifndef CONFIG_DM_SPI | |
90 | spi_free_slave(slave); | |
91 | #endif | |
92 | ||
93 | return ret; | |
94 | } | |
95 | ||
96 | /* | |
97 | * SPI read/write | |
98 | * | |
99 | * Syntax: | |
100 | * spi {dev} {num_bits} {dout} | |
101 | * {dev} is the device number for controlling chip select (see TBD) | |
102 | * {num_bits} is the number of bits to send & receive (base 10) | |
103 | * {dout} is a hexadecimal string of data to send | |
104 | * The command prints out the hexadecimal string received via SPI. | |
105 | */ | |
106 | ||
107 | int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) | |
108 | { | |
109 | char *cp = 0; | |
110 | uchar tmp; | |
111 | int j; | |
112 | ||
113 | /* | |
114 | * We use the last specified parameters, unless new ones are | |
115 | * entered. | |
116 | */ | |
117 | ||
118 | if ((flag & CMD_FLAG_REPEAT) == 0) | |
119 | { | |
120 | if (argc >= 2) { | |
121 | mode = CONFIG_DEFAULT_SPI_MODE; | |
122 | bus = simple_strtoul(argv[1], &cp, 10); | |
123 | if (*cp == ':') { | |
124 | cs = simple_strtoul(cp+1, &cp, 10); | |
125 | } else { | |
126 | cs = bus; | |
127 | bus = CONFIG_DEFAULT_SPI_BUS; | |
128 | } | |
129 | if (*cp == '.') | |
130 | mode = simple_strtoul(cp+1, NULL, 10); | |
131 | } | |
132 | if (argc >= 3) | |
133 | bitlen = simple_strtoul(argv[2], NULL, 10); | |
134 | if (argc >= 4) { | |
135 | cp = argv[3]; | |
136 | for(j = 0; *cp; j++, cp++) { | |
137 | tmp = *cp - '0'; | |
138 | if(tmp > 9) | |
139 | tmp -= ('A' - '0') - 10; | |
140 | if(tmp > 15) | |
141 | tmp -= ('a' - 'A'); | |
142 | if(tmp > 15) { | |
143 | printf("Hex conversion error on %c\n", *cp); | |
144 | return 1; | |
145 | } | |
146 | if((j % 2) == 0) | |
147 | dout[j / 2] = (tmp << 4); | |
148 | else | |
149 | dout[j / 2] |= tmp; | |
150 | } | |
151 | } | |
152 | } | |
153 | ||
154 | if ((bitlen < 0) || (bitlen > (MAX_SPI_BYTES * 8))) { | |
155 | printf("Invalid bitlen %d\n", bitlen); | |
156 | return 1; | |
157 | } | |
158 | ||
159 | if (do_spi_xfer(bus, cs)) | |
160 | return 1; | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | /***************************************************/ | |
166 | ||
167 | U_BOOT_CMD( | |
168 | sspi, 5, 1, do_spi, | |
169 | "SPI utility command", | |
170 | "[<bus>:]<cs>[.<mode>] <bit_len> <dout> - Send and receive bits\n" | |
171 | "<bus> - Identifies the SPI bus\n" | |
172 | "<cs> - Identifies the chip select\n" | |
173 | "<mode> - Identifies the SPI mode to use\n" | |
174 | "<bit_len> - Number of bits to send (base 10)\n" | |
175 | "<dout> - Hexadecimal string that gets sent" | |
176 | ); |