3 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
5 * See file CREDITS for list of people who contributed to this
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.
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.
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,
25 * SPI Read/Write Utilities
32 /*-----------------------------------------------------------------------
37 # define MAX_SPI_BYTES 32 /* Maximum number of bytes we can handle */
40 #ifndef CONFIG_DEFAULT_SPI_BUS
41 # define CONFIG_DEFAULT_SPI_BUS 0
43 #ifndef CONFIG_DEFAULT_SPI_MODE
44 # define CONFIG_DEFAULT_SPI_MODE SPI_MODE_0
48 * Values from last command.
50 static unsigned int device;
52 static uchar dout[MAX_SPI_BYTES];
53 static uchar din[MAX_SPI_BYTES];
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.
66 int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
68 struct spi_slave *slave;
75 * We use the last specified parameters, unless new ones are
79 if ((flag & CMD_FLAG_REPEAT) == 0)
82 device = simple_strtoul(argv[1], NULL, 10);
84 bitlen = simple_strtoul(argv[2], NULL, 10);
87 for(j = 0; *cp; j++, cp++) {
90 tmp -= ('A' - '0') - 10;
94 printf("Hex conversion error on %c, giving up.\n", *cp);
98 dout[j / 2] = (tmp << 4);
105 if ((bitlen < 0) || (bitlen > (MAX_SPI_BYTES * 8))) {
106 printf("Invalid bitlen %d, giving up.\n", bitlen);
110 /* FIXME: Make these parameters run-time configurable */
111 slave = spi_setup_slave(CONFIG_DEFAULT_SPI_BUS, device, 1000000,
112 CONFIG_DEFAULT_SPI_MODE);
114 printf("Invalid device %d, giving up.\n", device);
118 debug ("spi chipsel = %08X\n", device);
120 spi_claim_bus(slave);
121 if(spi_xfer(slave, bitlen, dout, din,
122 SPI_XFER_BEGIN | SPI_XFER_END) != 0) {
123 printf("Error with the SPI transaction.\n");
126 for(j = 0; j < ((bitlen + 7) / 8); j++) {
127 printf("%02X", din[j]);
131 spi_release_bus(slave);
132 spi_free_slave(slave);
137 /***************************************************/
141 "SPI utility commands",
142 "<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"
145 "<dout> - Hexadecimal string that gets sent"