/** * NXT bootstrap interface; NXT flash chip code. * * Copyright 2006 David Anderson * * 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 "flash.h" #include "samba.h" enum nxt_flash_commands { FLASH_CMD_LOCK = 0x2, FLASH_CMD_UNLOCK = 0x4, }; nxt_error_t nxt_flash_wait_ready(nxt_t *nxt) { nxt_word_t flash_status; do { NXT_ERR(nxt_read_word(nxt, 0xFFFFFF68, &flash_status)); /* Bit 0 is the FRDY field. Set to 1 if the flash controller is * ready to run a new command. */ } while (!(flash_status & 0x1)); return NXT_OK; } static nxt_error_t nxt_flash_alter_lock(nxt_t *nxt, int region_num, enum nxt_flash_commands cmd) { nxt_word_t w = 0x5A000000 | ((64 * region_num) << 8); w += cmd; NXT_ERR(nxt_flash_wait_ready(nxt)); /* Flash mode register: FCMN 0x5, FWS 0x1 * Flash command register: KEY 0x5A, FCMD = clear-lock-bit (0x4) * Flash mode register: FCMN 0x34, FWS 0x1 */ NXT_ERR(nxt_write_word(nxt, 0xFFFFFF60, 0x00050100)); NXT_ERR(nxt_write_word(nxt, 0xFFFFFF64, w)); NXT_ERR(nxt_write_word(nxt, 0xFFFFFF60, 0x00340100)); return NXT_OK; } nxt_error_t nxt_flash_lock_region(nxt_t *nxt, int region_num) { return nxt_flash_alter_lock(nxt, region_num, FLASH_CMD_LOCK); } nxt_error_t nxt_flash_unlock_region(nxt_t *nxt, int region_num) { return nxt_flash_alter_lock(nxt, region_num, FLASH_CMD_UNLOCK); } nxt_error_t nxt_flash_lock_all_regions(nxt_t *nxt) { int i; for (i = 0; i < 16; i++) NXT_ERR(nxt_flash_lock_region(nxt, i)); return NXT_OK; } nxt_error_t nxt_flash_unlock_all_regions(nxt_t *nxt) { int i; for (i = 0; i < 16; i++) NXT_ERR(nxt_flash_unlock_region(nxt, i)); return NXT_OK; }