diff options
Diffstat (limited to 'w29ee011.c')
| -rw-r--r-- | w29ee011.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/w29ee011.c b/w29ee011.c new file mode 100644 index 0000000..88a7a8a --- /dev/null +++ b/w29ee011.c @@ -0,0 +1,60 @@ +/* + * This file is part of the flashrom project. + * + * Copyright (C) 2007 Markus Boas <ryven@ryven.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. + * + * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "flash.h" + +int probe_w29ee011(struct flashchip *flash) +{ + volatile uint8_t *bios = flash->virtual_memory; + uint8_t id1, id2; + + /* Issue JEDEC Product ID Entry command */ + *(volatile uint8_t *)(bios + 0x5555) = 0xAA; + myusec_delay(10); + *(volatile uint8_t *)(bios + 0x2AAA) = 0x55; + myusec_delay(10); + *(volatile uint8_t *)(bios + 0x5555) = 0x80; + myusec_delay(10); + *(volatile uint8_t *)(bios + 0x5555) = 0xAA; + myusec_delay(10); + *(volatile uint8_t *)(bios + 0x2AAA) = 0x55; + myusec_delay(10); + *(volatile uint8_t *)(bios + 0x5555) = 0x60; + myusec_delay(10); + + /* Read product ID */ + id1 = *(volatile uint8_t *)bios; + id2 = *(volatile uint8_t *)(bios + 0x01); + + /* Issue JEDEC Product ID Exit command */ + *(volatile uint8_t *)(bios + 0x5555) = 0xAA; + myusec_delay(10); + *(volatile uint8_t *)(bios + 0x2AAA) = 0x55; + myusec_delay(10); + *(volatile uint8_t *)(bios + 0x5555) = 0xF0; + myusec_delay(10); + + printf_debug("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2); + + if (id1 == flash->manufacture_id && id2 == flash->model_id) + return 1; + + return 0; +} |
