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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 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24/*
25 * SPI Read/Write Utilities
26 */
27
28#include <common.h>
29#include <command.h>
30#include <spi.h>
wdenke3093092002-10-01 01:07:28 +000031
wdenkeb9401e2002-11-11 02:11:37 +000032/*-----------------------------------------------------------------------
33 * Definitions
34 */
35
36#ifndef MAX_SPI_BYTES
37# define MAX_SPI_BYTES 32 /* Maximum number of bytes we can handle */
38#endif
wdenke3093092002-10-01 01:07:28 +000039
Haavard Skinnemoend255bb02008-05-16 11:10:31 +020040#ifndef CONFIG_DEFAULT_SPI_BUS
41# define CONFIG_DEFAULT_SPI_BUS 0
42#endif
43#ifndef CONFIG_DEFAULT_SPI_MODE
44# define CONFIG_DEFAULT_SPI_MODE SPI_MODE_0
45#endif
wdenke3093092002-10-01 01:07:28 +000046
47/*
48 * Values from last command.
49 */
Reinhard Meyer21032b32010-08-26 10:57:27 +020050static unsigned int bus;
51static unsigned int cs;
52static unsigned int mode;
Haavard Skinnemoend255bb02008-05-16 11:10:31 +020053static int bitlen;
54static uchar dout[MAX_SPI_BYTES];
55static uchar din[MAX_SPI_BYTES];
wdenke3093092002-10-01 01:07:28 +000056
57/*
58 * SPI read/write
59 *
60 * Syntax:
61 * spi {dev} {num_bits} {dout}
62 * {dev} is the device number for controlling chip select (see TBD)
63 * {num_bits} is the number of bits to send & receive (base 10)
64 * {dout} is a hexadecimal string of data to send
65 * The command prints out the hexadecimal string received via SPI.
66 */
67
Wolfgang Denk54841ab2010-06-28 22:00:46 +020068int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
wdenke3093092002-10-01 01:07:28 +000069{
Haavard Skinnemoend255bb02008-05-16 11:10:31 +020070 struct spi_slave *slave;
wdenke3093092002-10-01 01:07:28 +000071 char *cp = 0;
72 uchar tmp;
73 int j;
74 int rcode = 0;
75
76 /*
77 * We use the last specified parameters, unless new ones are
78 * entered.
79 */
80
81 if ((flag & CMD_FLAG_REPEAT) == 0)
82 {
Reinhard Meyer21032b32010-08-26 10:57:27 +020083 if (argc >= 2) {
84 mode = CONFIG_DEFAULT_SPI_MODE;
85 bus = simple_strtoul(argv[1], &cp, 10);
86 if (*cp == ':') {
87 cs = simple_strtoul(cp+1, &cp, 10);
88 } else {
89 cs = bus;
90 bus = CONFIG_DEFAULT_SPI_BUS;
91 }
92 if (*cp == '.');
93 mode = simple_strtoul(cp+1, NULL, 10);
94 }
wdenke3093092002-10-01 01:07:28 +000095 if (argc >= 3)
96 bitlen = simple_strtoul(argv[2], NULL, 10);
wdenkeb9401e2002-11-11 02:11:37 +000097 if (argc >= 4) {
98 cp = argv[3];
99 for(j = 0; *cp; j++, cp++) {
100 tmp = *cp - '0';
101 if(tmp > 9)
102 tmp -= ('A' - '0') - 10;
103 if(tmp > 15)
104 tmp -= ('a' - 'A');
105 if(tmp > 15) {
Reinhard Meyer21032b32010-08-26 10:57:27 +0200106 printf("Hex conversion error on %c\n", *cp);
wdenkeb9401e2002-11-11 02:11:37 +0000107 return 1;
108 }
109 if((j % 2) == 0)
110 dout[j / 2] = (tmp << 4);
111 else
112 dout[j / 2] |= tmp;
wdenke3093092002-10-01 01:07:28 +0000113 }
wdenke3093092002-10-01 01:07:28 +0000114 }
115 }
116
wdenkeb9401e2002-11-11 02:11:37 +0000117 if ((bitlen < 0) || (bitlen > (MAX_SPI_BYTES * 8))) {
Reinhard Meyer21032b32010-08-26 10:57:27 +0200118 printf("Invalid bitlen %d\n", bitlen);
wdenkeb9401e2002-11-11 02:11:37 +0000119 return 1;
wdenk8bde7f72003-06-27 21:31:46 +0000120 }
wdenkeb9401e2002-11-11 02:11:37 +0000121
Reinhard Meyer21032b32010-08-26 10:57:27 +0200122 slave = spi_setup_slave(bus, cs, 1000000, mode);
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200123 if (!slave) {
Reinhard Meyer21032b32010-08-26 10:57:27 +0200124 printf("Invalid device %d:%d\n", bus, cs);
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200125 return 1;
126 }
wdenkeb9401e2002-11-11 02:11:37 +0000127
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200128 spi_claim_bus(slave);
129 if(spi_xfer(slave, bitlen, dout, din,
130 SPI_XFER_BEGIN | SPI_XFER_END) != 0) {
Reinhard Meyer21032b32010-08-26 10:57:27 +0200131 printf("Error during SPI transaction\n");
wdenke3093092002-10-01 01:07:28 +0000132 rcode = 1;
133 } else {
wdenke3093092002-10-01 01:07:28 +0000134 for(j = 0; j < ((bitlen + 7) / 8); j++) {
Mike Frysingerc46980f2008-10-14 07:04:38 -0400135 printf("%02X", din[j]);
wdenke3093092002-10-01 01:07:28 +0000136 }
137 printf("\n");
138 }
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200139 spi_release_bus(slave);
140 spi_free_slave(slave);
wdenke3093092002-10-01 01:07:28 +0000141
142 return rcode;
143}
144
wdenk8bde7f72003-06-27 21:31:46 +0000145/***************************************************/
146
wdenk0d498392003-07-01 21:06:45 +0000147U_BOOT_CMD(
148 sspi, 5, 1, do_spi,
Reinhard Meyer21032b32010-08-26 10:57:27 +0200149 "SPI utility command",
150 "[<bus>:]<cs>[.<mode>] <bit_len> <dout> - Send and receive bits\n"
151 "<bus> - Identifies the SPI bus\n"
152 "<cs> - Identifies the chip select\n"
153 "<mode> - Identifies the SPI mode to use\n"
wdenk8bde7f72003-06-27 21:31:46 +0000154 "<bit_len> - Number of bits to send (base 10)\n"
Wolfgang Denka89c33d2009-05-24 17:06:54 +0200155 "<dout> - Hexadecimal string that gets sent"
wdenk8bde7f72003-06-27 21:31:46 +0000156);