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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 */
Haavard Skinnemoend255bb02008-05-16 11:10:31 +020050static unsigned int device;
51static int bitlen;
52static uchar dout[MAX_SPI_BYTES];
53static uchar din[MAX_SPI_BYTES];
wdenke3093092002-10-01 01:07:28 +000054
55/*
56 * SPI read/write
57 *
58 * Syntax:
59 * spi {dev} {num_bits} {dout}
60 * {dev} is the device number for controlling chip select (see TBD)
61 * {num_bits} is the number of bits to send & receive (base 10)
62 * {dout} is a hexadecimal string of data to send
63 * The command prints out the hexadecimal string received via SPI.
64 */
65
wdenkeb9401e2002-11-11 02:11:37 +000066int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
wdenke3093092002-10-01 01:07:28 +000067{
Haavard Skinnemoend255bb02008-05-16 11:10:31 +020068 struct spi_slave *slave;
wdenke3093092002-10-01 01:07:28 +000069 char *cp = 0;
70 uchar tmp;
71 int j;
72 int rcode = 0;
73
74 /*
75 * We use the last specified parameters, unless new ones are
76 * entered.
77 */
78
79 if ((flag & CMD_FLAG_REPEAT) == 0)
80 {
81 if (argc >= 2)
82 device = simple_strtoul(argv[1], NULL, 10);
83 if (argc >= 3)
84 bitlen = simple_strtoul(argv[2], NULL, 10);
wdenkeb9401e2002-11-11 02:11:37 +000085 if (argc >= 4) {
86 cp = argv[3];
87 for(j = 0; *cp; j++, cp++) {
88 tmp = *cp - '0';
89 if(tmp > 9)
90 tmp -= ('A' - '0') - 10;
91 if(tmp > 15)
92 tmp -= ('a' - 'A');
93 if(tmp > 15) {
94 printf("Hex conversion error on %c, giving up.\n", *cp);
95 return 1;
96 }
97 if((j % 2) == 0)
98 dout[j / 2] = (tmp << 4);
99 else
100 dout[j / 2] |= tmp;
wdenke3093092002-10-01 01:07:28 +0000101 }
wdenke3093092002-10-01 01:07:28 +0000102 }
103 }
104
wdenkeb9401e2002-11-11 02:11:37 +0000105 if ((bitlen < 0) || (bitlen > (MAX_SPI_BYTES * 8))) {
106 printf("Invalid bitlen %d, giving up.\n", bitlen);
107 return 1;
wdenk8bde7f72003-06-27 21:31:46 +0000108 }
wdenkeb9401e2002-11-11 02:11:37 +0000109
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200110 /* FIXME: Make these parameters run-time configurable */
111 slave = spi_setup_slave(CONFIG_DEFAULT_SPI_BUS, device, 1000000,
112 CONFIG_DEFAULT_SPI_MODE);
113 if (!slave) {
114 printf("Invalid device %d, giving up.\n", device);
115 return 1;
116 }
wdenkeb9401e2002-11-11 02:11:37 +0000117
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200118 debug ("spi chipsel = %08X\n", device);
119
120 spi_claim_bus(slave);
121 if(spi_xfer(slave, bitlen, dout, din,
122 SPI_XFER_BEGIN | SPI_XFER_END) != 0) {
wdenke3093092002-10-01 01:07:28 +0000123 printf("Error with the SPI transaction.\n");
124 rcode = 1;
125 } else {
wdenke3093092002-10-01 01:07:28 +0000126 for(j = 0; j < ((bitlen + 7) / 8); j++) {
Mike Frysingerc46980f2008-10-14 07:04:38 -0400127 printf("%02X", din[j]);
wdenke3093092002-10-01 01:07:28 +0000128 }
129 printf("\n");
130 }
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200131 spi_release_bus(slave);
132 spi_free_slave(slave);
wdenke3093092002-10-01 01:07:28 +0000133
134 return rcode;
135}
136
wdenk8bde7f72003-06-27 21:31:46 +0000137/***************************************************/
138
wdenk0d498392003-07-01 21:06:45 +0000139U_BOOT_CMD(
140 sspi, 5, 1, do_spi,
Peter Tyser2fb26042009-01-27 18:03:12 -0600141 "SPI utility commands",
wdenk8bde7f72003-06-27 21:31:46 +0000142 "<device> <bit_len> <dout> - Send <bit_len> bits from <dout> out the SPI\n"
143 "<device> - Identifies the chip select of the device\n"
144 "<bit_len> - Number of bits to send (base 10)\n"
Wolfgang Denka89c33d2009-05-24 17:06:54 +0200145 "<dout> - Hexadecimal string that gets sent"
wdenk8bde7f72003-06-27 21:31:46 +0000146);