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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
32#if (CONFIG_COMMANDS & CFG_CMD_SPI)
33
wdenkeb9401e2002-11-11 02:11:37 +000034/*-----------------------------------------------------------------------
35 * Definitions
36 */
37
38#ifndef MAX_SPI_BYTES
39# define MAX_SPI_BYTES 32 /* Maximum number of bytes we can handle */
40#endif
wdenke3093092002-10-01 01:07:28 +000041
42/*
43 * External table of chip select functions (see the appropriate board
44 * support for the actual definition of the table).
45 */
46extern spi_chipsel_type spi_chipsel[];
wdenkeb9401e2002-11-11 02:11:37 +000047extern int spi_chipsel_cnt;
wdenke3093092002-10-01 01:07:28 +000048
49/*
50 * Values from last command.
51 */
52static int device;
53static int bitlen;
54static uchar dout[MAX_SPI_BYTES];
55static uchar din[MAX_SPI_BYTES];
56
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
wdenkeb9401e2002-11-11 02:11:37 +000068int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
wdenke3093092002-10-01 01:07:28 +000069{
70 char *cp = 0;
71 uchar tmp;
72 int j;
73 int rcode = 0;
74
75 /*
76 * We use the last specified parameters, unless new ones are
77 * entered.
78 */
79
80 if ((flag & CMD_FLAG_REPEAT) == 0)
81 {
82 if (argc >= 2)
83 device = simple_strtoul(argv[1], NULL, 10);
84 if (argc >= 3)
85 bitlen = simple_strtoul(argv[2], NULL, 10);
wdenkeb9401e2002-11-11 02:11:37 +000086 if (argc >= 4) {
87 cp = argv[3];
88 for(j = 0; *cp; j++, cp++) {
89 tmp = *cp - '0';
90 if(tmp > 9)
91 tmp -= ('A' - '0') - 10;
92 if(tmp > 15)
93 tmp -= ('a' - 'A');
94 if(tmp > 15) {
95 printf("Hex conversion error on %c, giving up.\n", *cp);
96 return 1;
97 }
98 if((j % 2) == 0)
99 dout[j / 2] = (tmp << 4);
100 else
101 dout[j / 2] |= tmp;
wdenke3093092002-10-01 01:07:28 +0000102 }
wdenke3093092002-10-01 01:07:28 +0000103 }
104 }
105
wdenkeb9401e2002-11-11 02:11:37 +0000106 if ((device < 0) || (device >= spi_chipsel_cnt)) {
107 printf("Invalid device %d, giving up.\n", device);
108 return 1;
wdenk8bde7f72003-06-27 21:31:46 +0000109 }
wdenkeb9401e2002-11-11 02:11:37 +0000110 if ((bitlen < 0) || (bitlen > (MAX_SPI_BYTES * 8))) {
111 printf("Invalid bitlen %d, giving up.\n", bitlen);
112 return 1;
wdenk8bde7f72003-06-27 21:31:46 +0000113 }
wdenkeb9401e2002-11-11 02:11:37 +0000114
115 debug ("spi_chipsel[%d] = %08X\n",
116 device, (uint)spi_chipsel[device]);
117
wdenke3093092002-10-01 01:07:28 +0000118 if(spi_xfer(spi_chipsel[device], bitlen, dout, din) != 0) {
119 printf("Error with the SPI transaction.\n");
120 rcode = 1;
121 } else {
122 cp = din;
123 for(j = 0; j < ((bitlen + 7) / 8); j++) {
124 printf("%02X", *cp++);
125 }
126 printf("\n");
127 }
128
129 return rcode;
130}
131
wdenk8bde7f72003-06-27 21:31:46 +0000132/***************************************************/
133
wdenk0d498392003-07-01 21:06:45 +0000134U_BOOT_CMD(
135 sspi, 5, 1, do_spi,
wdenk8bde7f72003-06-27 21:31:46 +0000136 "sspi - SPI utility commands\n",
137 "<device> <bit_len> <dout> - Send <bit_len> bits from <dout> out the SPI\n"
138 "<device> - Identifies the chip select of the device\n"
139 "<bit_len> - Number of bits to send (base 10)\n"
140 "<dout> - Hexadecimal string that gets sent\n"
141);
142
wdenke3093092002-10-01 01:07:28 +0000143#endif /* CFG_CMD_SPI */