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wdenke3093092002-10-01 01:07:28 +00001/*
2 * (C) Copyright 2002
3 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
4 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02005 * SPDX-License-Identifier: GPL-2.0+
wdenke3093092002-10-01 01:07:28 +00006 */
7
8/*
9 * SPI Read/Write Utilities
10 */
11
12#include <common.h>
13#include <command.h>
Simon Glassdf3b23a2014-09-15 06:33:22 -060014#include <errno.h>
wdenke3093092002-10-01 01:07:28 +000015#include <spi.h>
wdenke3093092002-10-01 01:07:28 +000016
wdenkeb9401e2002-11-11 02:11:37 +000017/*-----------------------------------------------------------------------
18 * Definitions
19 */
20
21#ifndef MAX_SPI_BYTES
22# define MAX_SPI_BYTES 32 /* Maximum number of bytes we can handle */
23#endif
wdenke3093092002-10-01 01:07:28 +000024
Haavard Skinnemoend255bb02008-05-16 11:10:31 +020025#ifndef CONFIG_DEFAULT_SPI_BUS
26# define CONFIG_DEFAULT_SPI_BUS 0
27#endif
28#ifndef CONFIG_DEFAULT_SPI_MODE
29# define CONFIG_DEFAULT_SPI_MODE SPI_MODE_0
30#endif
wdenke3093092002-10-01 01:07:28 +000031
32/*
33 * Values from last command.
34 */
Reinhard Meyer21032b32010-08-26 10:57:27 +020035static unsigned int bus;
36static unsigned int cs;
37static unsigned int mode;
Haavard Skinnemoend255bb02008-05-16 11:10:31 +020038static int bitlen;
39static uchar dout[MAX_SPI_BYTES];
40static uchar din[MAX_SPI_BYTES];
wdenke3093092002-10-01 01:07:28 +000041
Simon Glassdf3b23a2014-09-15 06:33:22 -060042static int do_spi_xfer(int bus, int cs)
43{
44 struct spi_slave *slave;
45 int rcode = 0;
46
47 slave = spi_setup_slave(bus, cs, 1000000, mode);
48 if (!slave) {
49 printf("Invalid device %d:%d\n", bus, cs);
50 return -EINVAL;
51 }
52
53 spi_claim_bus(slave);
54 if (spi_xfer(slave, bitlen, dout, din,
55 SPI_XFER_BEGIN | SPI_XFER_END) != 0) {
56 printf("Error during SPI transaction\n");
57 rcode = -EIO;
58 } else {
59 int j;
60
61 for (j = 0; j < ((bitlen + 7) / 8); j++)
62 printf("%02X", din[j]);
63 printf("\n");
64 }
65 spi_release_bus(slave);
66 spi_free_slave(slave);
67
68 return rcode;
69}
70
wdenke3093092002-10-01 01:07:28 +000071/*
72 * SPI read/write
73 *
74 * Syntax:
75 * spi {dev} {num_bits} {dout}
76 * {dev} is the device number for controlling chip select (see TBD)
77 * {num_bits} is the number of bits to send & receive (base 10)
78 * {dout} is a hexadecimal string of data to send
79 * The command prints out the hexadecimal string received via SPI.
80 */
81
Wolfgang Denk54841ab2010-06-28 22:00:46 +020082int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
wdenke3093092002-10-01 01:07:28 +000083{
84 char *cp = 0;
85 uchar tmp;
86 int j;
wdenke3093092002-10-01 01:07:28 +000087
88 /*
89 * We use the last specified parameters, unless new ones are
90 * entered.
91 */
92
93 if ((flag & CMD_FLAG_REPEAT) == 0)
94 {
Reinhard Meyer21032b32010-08-26 10:57:27 +020095 if (argc >= 2) {
96 mode = CONFIG_DEFAULT_SPI_MODE;
97 bus = simple_strtoul(argv[1], &cp, 10);
98 if (*cp == ':') {
99 cs = simple_strtoul(cp+1, &cp, 10);
100 } else {
101 cs = bus;
102 bus = CONFIG_DEFAULT_SPI_BUS;
103 }
Marek Vasut2d5e7c72012-08-01 15:12:15 +0200104 if (*cp == '.')
Reinhard Meyer21032b32010-08-26 10:57:27 +0200105 mode = simple_strtoul(cp+1, NULL, 10);
106 }
wdenke3093092002-10-01 01:07:28 +0000107 if (argc >= 3)
108 bitlen = simple_strtoul(argv[2], NULL, 10);
wdenkeb9401e2002-11-11 02:11:37 +0000109 if (argc >= 4) {
110 cp = argv[3];
111 for(j = 0; *cp; j++, cp++) {
112 tmp = *cp - '0';
113 if(tmp > 9)
114 tmp -= ('A' - '0') - 10;
115 if(tmp > 15)
116 tmp -= ('a' - 'A');
117 if(tmp > 15) {
Reinhard Meyer21032b32010-08-26 10:57:27 +0200118 printf("Hex conversion error on %c\n", *cp);
wdenkeb9401e2002-11-11 02:11:37 +0000119 return 1;
120 }
121 if((j % 2) == 0)
122 dout[j / 2] = (tmp << 4);
123 else
124 dout[j / 2] |= tmp;
wdenke3093092002-10-01 01:07:28 +0000125 }
wdenke3093092002-10-01 01:07:28 +0000126 }
127 }
128
wdenkeb9401e2002-11-11 02:11:37 +0000129 if ((bitlen < 0) || (bitlen > (MAX_SPI_BYTES * 8))) {
Reinhard Meyer21032b32010-08-26 10:57:27 +0200130 printf("Invalid bitlen %d\n", bitlen);
wdenkeb9401e2002-11-11 02:11:37 +0000131 return 1;
wdenk8bde7f72003-06-27 21:31:46 +0000132 }
wdenkeb9401e2002-11-11 02:11:37 +0000133
Simon Glassdf3b23a2014-09-15 06:33:22 -0600134 if (do_spi_xfer(bus, cs))
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200135 return 1;
wdenkeb9401e2002-11-11 02:11:37 +0000136
Simon Glassdf3b23a2014-09-15 06:33:22 -0600137 return 0;
wdenke3093092002-10-01 01:07:28 +0000138}
139
wdenk8bde7f72003-06-27 21:31:46 +0000140/***************************************************/
141
wdenk0d498392003-07-01 21:06:45 +0000142U_BOOT_CMD(
143 sspi, 5, 1, do_spi,
Reinhard Meyer21032b32010-08-26 10:57:27 +0200144 "SPI utility command",
145 "[<bus>:]<cs>[.<mode>] <bit_len> <dout> - Send and receive bits\n"
146 "<bus> - Identifies the SPI bus\n"
147 "<cs> - Identifies the chip select\n"
148 "<mode> - Identifies the SPI mode to use\n"
wdenk8bde7f72003-06-27 21:31:46 +0000149 "<bit_len> - Number of bits to send (base 10)\n"
Wolfgang Denka89c33d2009-05-24 17:06:54 +0200150 "<dout> - Hexadecimal string that gets sent"
wdenk8bde7f72003-06-27 21:31:46 +0000151);