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Commit | Line | Data |
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e3093091 WD |
1 | /* |
2 | * (C) Copyright 2002 | |
3 | * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com | |
4 | * | |
1a459660 | 5 | * SPDX-License-Identifier: GPL-2.0+ |
e3093091 WD |
6 | */ |
7 | ||
8 | /* | |
9 | * SPI Read/Write Utilities | |
10 | */ | |
11 | ||
12 | #include <common.h> | |
13 | #include <command.h> | |
14 | #include <spi.h> | |
e3093091 | 15 | |
eb9401e3 WD |
16 | /*----------------------------------------------------------------------- |
17 | * Definitions | |
18 | */ | |
19 | ||
20 | #ifndef MAX_SPI_BYTES | |
21 | # define MAX_SPI_BYTES 32 /* Maximum number of bytes we can handle */ | |
22 | #endif | |
e3093091 | 23 | |
d255bb0e HS |
24 | #ifndef CONFIG_DEFAULT_SPI_BUS |
25 | # define CONFIG_DEFAULT_SPI_BUS 0 | |
26 | #endif | |
27 | #ifndef CONFIG_DEFAULT_SPI_MODE | |
28 | # define CONFIG_DEFAULT_SPI_MODE SPI_MODE_0 | |
29 | #endif | |
e3093091 WD |
30 | |
31 | /* | |
32 | * Values from last command. | |
33 | */ | |
21032b35 RM |
34 | static unsigned int bus; |
35 | static unsigned int cs; | |
36 | static unsigned int mode; | |
d255bb0e HS |
37 | static int bitlen; |
38 | static uchar dout[MAX_SPI_BYTES]; | |
39 | static uchar din[MAX_SPI_BYTES]; | |
e3093091 WD |
40 | |
41 | /* | |
42 | * SPI read/write | |
43 | * | |
44 | * Syntax: | |
45 | * spi {dev} {num_bits} {dout} | |
46 | * {dev} is the device number for controlling chip select (see TBD) | |
47 | * {num_bits} is the number of bits to send & receive (base 10) | |
48 | * {dout} is a hexadecimal string of data to send | |
49 | * The command prints out the hexadecimal string received via SPI. | |
50 | */ | |
51 | ||
54841ab5 | 52 | int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) |
e3093091 | 53 | { |
d255bb0e | 54 | struct spi_slave *slave; |
e3093091 WD |
55 | char *cp = 0; |
56 | uchar tmp; | |
57 | int j; | |
58 | int rcode = 0; | |
59 | ||
60 | /* | |
61 | * We use the last specified parameters, unless new ones are | |
62 | * entered. | |
63 | */ | |
64 | ||
65 | if ((flag & CMD_FLAG_REPEAT) == 0) | |
66 | { | |
21032b35 RM |
67 | if (argc >= 2) { |
68 | mode = CONFIG_DEFAULT_SPI_MODE; | |
69 | bus = simple_strtoul(argv[1], &cp, 10); | |
70 | if (*cp == ':') { | |
71 | cs = simple_strtoul(cp+1, &cp, 10); | |
72 | } else { | |
73 | cs = bus; | |
74 | bus = CONFIG_DEFAULT_SPI_BUS; | |
75 | } | |
2d5e7c7a | 76 | if (*cp == '.') |
21032b35 RM |
77 | mode = simple_strtoul(cp+1, NULL, 10); |
78 | } | |
e3093091 WD |
79 | if (argc >= 3) |
80 | bitlen = simple_strtoul(argv[2], NULL, 10); | |
eb9401e3 WD |
81 | if (argc >= 4) { |
82 | cp = argv[3]; | |
83 | for(j = 0; *cp; j++, cp++) { | |
84 | tmp = *cp - '0'; | |
85 | if(tmp > 9) | |
86 | tmp -= ('A' - '0') - 10; | |
87 | if(tmp > 15) | |
88 | tmp -= ('a' - 'A'); | |
89 | if(tmp > 15) { | |
21032b35 | 90 | printf("Hex conversion error on %c\n", *cp); |
eb9401e3 WD |
91 | return 1; |
92 | } | |
93 | if((j % 2) == 0) | |
94 | dout[j / 2] = (tmp << 4); | |
95 | else | |
96 | dout[j / 2] |= tmp; | |
e3093091 | 97 | } |
e3093091 WD |
98 | } |
99 | } | |
100 | ||
eb9401e3 | 101 | if ((bitlen < 0) || (bitlen > (MAX_SPI_BYTES * 8))) { |
21032b35 | 102 | printf("Invalid bitlen %d\n", bitlen); |
eb9401e3 | 103 | return 1; |
8bde7f77 | 104 | } |
eb9401e3 | 105 | |
21032b35 | 106 | slave = spi_setup_slave(bus, cs, 1000000, mode); |
d255bb0e | 107 | if (!slave) { |
21032b35 | 108 | printf("Invalid device %d:%d\n", bus, cs); |
d255bb0e HS |
109 | return 1; |
110 | } | |
111 | ||
d255bb0e HS |
112 | spi_claim_bus(slave); |
113 | if(spi_xfer(slave, bitlen, dout, din, | |
114 | SPI_XFER_BEGIN | SPI_XFER_END) != 0) { | |
21032b35 | 115 | printf("Error during SPI transaction\n"); |
e3093091 WD |
116 | rcode = 1; |
117 | } else { | |
e3093091 | 118 | for(j = 0; j < ((bitlen + 7) / 8); j++) { |
c46980f6 | 119 | printf("%02X", din[j]); |
e3093091 WD |
120 | } |
121 | printf("\n"); | |
122 | } | |
d255bb0e HS |
123 | spi_release_bus(slave); |
124 | spi_free_slave(slave); | |
e3093091 WD |
125 | |
126 | return rcode; | |
127 | } | |
128 | ||
8bde7f77 WD |
129 | /***************************************************/ |
130 | ||
0d498393 WD |
131 | U_BOOT_CMD( |
132 | sspi, 5, 1, do_spi, | |
21032b35 RM |
133 | "SPI utility command", |
134 | "[<bus>:]<cs>[.<mode>] <bit_len> <dout> - Send and receive bits\n" | |
135 | "<bus> - Identifies the SPI bus\n" | |
136 | "<cs> - Identifies the chip select\n" | |
137 | "<mode> - Identifies the SPI mode to use\n" | |
8bde7f77 | 138 | "<bit_len> - Number of bits to send (base 10)\n" |
a89c33db | 139 | "<dout> - Hexadecimal string that gets sent" |
8bde7f77 | 140 | ); |