diff options
Diffstat (limited to 'board/v38b/ethaddr.c')
| -rw-r--r-- | board/v38b/ethaddr.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/board/v38b/ethaddr.c b/board/v38b/ethaddr.c new file mode 100644 index 0000000..4e2494e --- /dev/null +++ b/board/v38b/ethaddr.c @@ -0,0 +1,213 @@ +/* + * (C) Copyright 2006 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * 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 + */ + +#include <common.h> +#include <mpc5xxx.h> + +/* For the V38B board the pin is GPIO_PSC_6 */ +#define GPIO_PIN GPIO_PSC6_0 + +#define NO_ERROR 0 +#define ERR_NO_NUMBER 1 +#define ERR_BAD_NUMBER 2 + +static int is_high(void); +static int check_device(void); +static void io_out(int value); +static void io_input(void); +static void io_output(void); +static void init_gpio(void); +static void read_byte(unsigned char *data); +static void write_byte(unsigned char command); + +void read_2501_memory(unsigned char *psernum, unsigned char *perr); +void board_get_enetaddr(uchar *enetaddr); + + +static int is_high() +{ + return (*((vu_long *) MPC5XXX_WU_GPIO_DATA_I) & GPIO_PIN); +} + +static void io_out(int value) +{ + if (value) + *((vu_long *) MPC5XXX_WU_GPIO_DATA_O) |= GPIO_PIN; + else + *((vu_long *) MPC5XXX_WU_GPIO_DATA_O) &= ~GPIO_PIN; +} + +static void io_input() +{ + *((vu_long *) MPC5XXX_WU_GPIO_DIR) &= ~GPIO_PIN; + udelay(3); /* allow input to settle */ +} + +static void io_output() +{ + *((vu_long *) MPC5XXX_WU_GPIO_DIR) |= GPIO_PIN; +} + +static void init_gpio() +{ + *((vu_long *) MPC5XXX_WU_GPIO_ENABLE) |= GPIO_PIN; /* Enable appropriate pin */ +} + +void read_2501_memory(unsigned char *psernum, unsigned char *perr) +{ +#define NBYTES 28 + unsigned char crcval, i; + unsigned char buf[NBYTES]; + + *perr = 0; + crcval = 0; + + for (i = 0; i < NBYTES; i++) + buf[i] = 0; + + if (!check_device()) + *perr = ERR_NO_NUMBER; + else { + *perr = NO_ERROR; + write_byte(0xCC); /* skip ROM (0xCC) */ + write_byte(0xF0); /* Read memory command 0xF0 */ + write_byte(0x00); /* Address TA1=0, TA2=0 */ + write_byte(0x00); + read_byte(&crcval); /* Read CRC of address and command */ + + for (i = 0; i < NBYTES; i++) + read_byte(&buf[i]); + } + if (strncmp((const char *) &buf[11], "MAREL IEEE 802.3", 16)) { + *perr = ERR_BAD_NUMBER; + psernum[0] = 0x00; + psernum[1] = 0xE0; + psernum[2] = 0xEE; + psernum[3] = 0xFF; + psernum[4] = 0xFF; + psernum[5] = 0xFF; + } else { + psernum[0] = 0x00; + psernum[1] = 0xE0; + psernum[2] = 0xEE; + psernum[3] = buf[7]; + psernum[4] = buf[6]; + psernum[5] = buf[5]; + } +} + +static int check_device() +{ + int found; + + io_output(); + io_out(0); + udelay(500); /* must be at least 480 us low pulse */ + + io_input(); + udelay(60); + + found = (is_high() == 0) ? 1 : 0; + udelay(500); /* must be at least 480 us low pulse */ + + return found; +} + +static void write_byte(unsigned char command) +{ + char i; + + for (i = 0; i < 8; i++) { + /* 1 us to 15 us low pulse starts bit slot */ + /* Start with high pulse for 3 us */ + io_input(); + udelay(3); + + io_out(0); + io_output(); + udelay(3); + + if (command & 0x01) { + /* 60 us high for 1-bit */ + io_input(); + udelay(60); + } else + /* 60 us low for 0-bit */ + udelay(60); + /* Leave pin as input */ + io_input(); + + command = command >> 1; + } +} + +static void read_byte(unsigned char *data) +{ + unsigned char i, rdat = 0; + + for (i = 0; i < 8; i++) { + /* read one bit from one-wire device */ + + /* 1 - 15 us low starts bit slot */ + io_out(0); + io_output(); + udelay(0); + + /* allow line to be pulled high */ + io_input(); + + /* delay 10 us */ + udelay(10); + + /* now sample input status */ + if (is_high()) + rdat = (rdat >> 1) | 0x80; + else + rdat = rdat >> 1; + + udelay(60); /* at least 60 us */ + } + /* copy the return value */ + *data = rdat; +} + +void board_get_enetaddr(uchar *enetaddr) +{ + unsigned char sn[6], err = NO_ERROR; + + init_gpio(); + + read_2501_memory(sn, &err); + + if (err == NO_ERROR) { + sprintf((char *)enetaddr, "%02x:%02x:%02x:%02x:%02x:%02x", + sn[0], sn[1], sn[2], sn[3], sn[4], sn[5]); + printf("MAC address: %s\n", enetaddr); + setenv("ethaddr", (char *)enetaddr); + } else { + sprintf((char *)enetaddr, "00:01:02:03:04:05"); + printf("Error reading MAC address.\n"); + printf("Setting default to %s\n", enetaddr); + setenv("ethaddr", (char *)enetaddr); + } +} |