/* * (C) Copyright 2002 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ /* * SPI Read/Write Utilities */ #include <common.h> #include <command.h> #include <spi.h> /*----------------------------------------------------------------------- * Definitions */ #ifndef MAX_SPI_BYTES # define MAX_SPI_BYTES 32 /* Maximum number of bytes we can handle */ #endif #ifndef CONFIG_DEFAULT_SPI_BUS # define CONFIG_DEFAULT_SPI_BUS 0 #endif #ifndef CONFIG_DEFAULT_SPI_MODE # define CONFIG_DEFAULT_SPI_MODE SPI_MODE_0 #endif /* * Values from last command. */ static unsigned int bus; static unsigned int cs; static unsigned int mode; static int bitlen; static uchar dout[MAX_SPI_BYTES]; static uchar din[MAX_SPI_BYTES]; /* * SPI read/write * * Syntax: * spi {dev} {num_bits} {dout} * {dev} is the device number for controlling chip select (see TBD) * {num_bits} is the number of bits to send & receive (base 10) * {dout} is a hexadecimal string of data to send * The command prints out the hexadecimal string received via SPI. */ int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { struct spi_slave *slave; char *cp = 0; uchar tmp; int j; int rcode = 0; /* * We use the last specified parameters, unless new ones are * entered. */ if ((flag & CMD_FLAG_REPEAT) == 0) { if (argc >= 2) { mode = CONFIG_DEFAULT_SPI_MODE; bus = simple_strtoul(argv[1], &cp, 10); if (*cp == ':') { cs = simple_strtoul(cp+1, &cp, 10); } else { cs = bus; bus = CONFIG_DEFAULT_SPI_BUS; } if (*cp == '.'); mode = simple_strtoul(cp+1, NULL, 10); } if (argc >= 3) bitlen = simple_strtoul(argv[2], NULL, 10); if (argc >= 4) { cp = argv[3]; for(j = 0; *cp; j++, cp++) { tmp = *cp - '0'; if(tmp > 9) tmp -= ('A' - '0') - 10; if(tmp > 15) tmp -= ('a' - 'A'); if(tmp > 15) { printf("Hex conversion error on %c\n", *cp); return 1; } if((j % 2) == 0) dout[j / 2] = (tmp << 4); else dout[j / 2] |= tmp; } } } if ((bitlen < 0) || (bitlen > (MAX_SPI_BYTES * 8))) { printf("Invalid bitlen %d\n", bitlen); return 1; } slave = spi_setup_slave(bus, cs, 1000000, mode); if (!slave) { printf("Invalid device %d:%d\n", bus, cs); return 1; } spi_claim_bus(slave); if(spi_xfer(slave, bitlen, dout, din, SPI_XFER_BEGIN | SPI_XFER_END) != 0) { printf("Error during SPI transaction\n"); rcode = 1; } else { for(j = 0; j < ((bitlen + 7) / 8); j++) { printf("%02X", din[j]); } printf("\n"); } spi_release_bus(slave); spi_free_slave(slave); return rcode; } /***************************************************/ U_BOOT_CMD( sspi, 5, 1, do_spi, "SPI utility command", "[<bus>:]<cs>[.<mode>] <bit_len> <dout> - Send and receive bits\n" "<bus> - Identifies the SPI bus\n" "<cs> - Identifies the chip select\n" "<mode> - Identifies the SPI mode to use\n" "<bit_len> - Number of bits to send (base 10)\n" "<dout> - Hexadecimal string that gets sent" );