diff options
Diffstat (limited to 'arch/powerpc/boards/pcm030/eeprom.c')
| -rw-r--r-- | arch/powerpc/boards/pcm030/eeprom.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/arch/powerpc/boards/pcm030/eeprom.c b/arch/powerpc/boards/pcm030/eeprom.c new file mode 100644 index 0000000000..aa00f361cd --- /dev/null +++ b/arch/powerpc/boards/pcm030/eeprom.c @@ -0,0 +1,118 @@ +/* + * Copyright (C) 2015 Juergen Borleis <kernel@pengutronix.de> + * + * Based on code from: + * Copyright (C) 2013 Jan Luebbe <j.luebbe@pengutronix.de> + * + * 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. + */ +#include <common.h> +#include <errno.h> +#include <fcntl.h> +#include <fs.h> +#include <globalvar.h> +#include <xfuncs.h> +#include <init.h> +#include <net.h> + +#define PCM030_EEPROM_DEVICE "/dev/eeprom0" + +/* + * The first 2048 bytes contain the U-Boot environment shipped with the boards. + * After that an area begins where some board specific and partially unique data + * is stored. All of this data is plain test, string delimiter is the semicolon. + * the last string terminates with a '\0'. + * One example found in the 'product' area: PCM-030-02REI;017822;0050C2875974\0 + * The first string seems to be the product type, the second string some kind + * of serial number and the last string the boards unique MAC. + */ +struct pcm030_eeprom { + char env[0x800]; /* u-boot environment */ + char product[0x80]; /* <product>;<serno>;<mac>\0 */ +} __attribute__((packed)); + +static void pcm030_read_factory_data(const struct pcm030_eeprom *buf) +{ + unsigned u, l; + char *board, *serial; + char *full_mac = "xx:xx:xx:xx:xx:xx"; + u8 enetaddr[6]; + + u = 0; + + for (l = 0; (l + u) < sizeof(buf->product); l++) { + if (buf->product[u + l] != ';') + continue; + board = xstrndup(&buf->product[u], l); + u += l + 1; + globalvar_add_simple("model.type", board); + free(board); + } + + for (l = 0; (l + u) < sizeof(buf->product); l++) { + if (buf->product[u + l] != ';') + continue; + serial = xstrndup(&buf->product[u], l); + u += l + 1; + globalvar_add_simple("model.serial", serial); + free(serial); + } + + /* for the MAC do a simple duck test */ + if (buf->product[u] != ';' && buf->product[u + 12] == '\0') { + full_mac[0] = buf->product[u + 0]; + full_mac[1] = buf->product[u + 1]; + full_mac[3] = buf->product[u + 2]; + full_mac[4] = buf->product[u + 3]; + full_mac[6] = buf->product[u + 4]; + full_mac[7] = buf->product[u + 5]; + full_mac[9] = buf->product[u + 6]; + full_mac[10] = buf->product[u + 7]; + full_mac[12] = buf->product[u + 8]; + full_mac[13] = buf->product[u + 9]; + full_mac[15] = buf->product[u + 10]; + full_mac[16] = buf->product[u + 11]; + string_to_ethaddr(full_mac, enetaddr); + eth_register_ethaddr(0, enetaddr); + return; + } + + printf("EEPROM contains no ethernet MAC\n"); +} + +static int pcm030_eeprom_read(void) +{ + int fd, ret; + struct pcm030_eeprom *buf; + + fd = open(PCM030_EEPROM_DEVICE, O_RDONLY); + if (fd < 0) { + perror("failed to open " PCM030_EEPROM_DEVICE); + return fd; + } + + buf = xmalloc(sizeof(struct pcm030_eeprom)); + + ret = pread(fd, buf, sizeof(struct pcm030_eeprom), 0); + if (ret < sizeof(struct pcm030_eeprom)) { + perror("failed to read " PCM030_EEPROM_DEVICE); + goto out; + } + + pcm030_read_factory_data(buf); + ret = 0; +out: + free(buf); + close(fd); + + return ret; +} +late_initcall(pcm030_eeprom_read); |