diff options
Diffstat (limited to 'en29lv640b.c')
| -rw-r--r-- | en29lv640b.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/en29lv640b.c b/en29lv640b.c new file mode 100644 index 0000000..0dff2d1 --- /dev/null +++ b/en29lv640b.c @@ -0,0 +1,138 @@ +/* + * This file is part of the flashrom project. + * + * Copyright (C) 2000 Silicon Integrated System Corporation + * Copyright (C) 2012 Rudolf Marek <r.marek@assembler.cz> + * + * 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" +#include "chipdrivers.h" + +/* + * WARNING! + * This chip uses the standard JEDEC addresses in 16-bit mode as word + * addresses. In byte mode, 0xAAA has to be used instead of 0x555 and + * 0x555 instead of 0x2AA. Do *not* blindly replace with standard JEDEC + * functions. + */ + +/* chunksize is 1 */ +int write_en29lv640b(struct flashctx *flash, uint8_t *src, unsigned int start, + unsigned int len) +{ + int i; + chipaddr bios = flash->virtual_memory; + chipaddr dst = flash->virtual_memory + start; + + for (i = 0; i < len; i += 2) { + chip_writeb(flash, 0xAA, bios + 0xAAA); + chip_writeb(flash, 0x55, bios + 0x555); + chip_writeb(flash, 0xA0, bios + 0xAAA); + + /* Transfer data from source to destination. */ + chip_writew(flash, (*src) | ((*(src + 1)) << 8 ), dst); + toggle_ready_jedec(flash, dst); +#if 0 + /* We only want to print something in the error case. */ + msg_cerr("Value in the flash at address 0x%lx = %#x, want %#x\n", + (dst - bios), chip_readb(flash, dst), *src); +#endif + dst += 2; + src += 2; + } + + /* FIXME: Ignore errors for now. */ + return 0; +} + +int probe_en29lv640b(struct flashctx *flash) +{ + chipaddr bios = flash->virtual_memory; + uint16_t id1, id2; + + chip_writeb(flash, 0xAA, bios + 0xAAA); + chip_writeb(flash, 0x55, bios + 0x555); + chip_writeb(flash, 0x90, bios + 0xAAA); + + programmer_delay(10); + + id1 = chip_readb(flash, bios + 0x200); + id1 |= (chip_readb(flash, bios) << 8); + + id2 = chip_readb(flash, bios + 0x02); + + chip_writeb(flash, 0xF0, bios + 0xAAA); + + programmer_delay(10); + + msg_cdbg("%s: id1 0x%04x, id2 0x%04x\n", __func__, id1, id2); + + if (id1 == flash->manufacture_id && id2 == flash->model_id) + return 1; + + return 0; +} + +int erase_en29lv640b(struct flashctx *flash) +{ + chipaddr bios = flash->virtual_memory; + + chip_writeb(flash, 0xAA, bios + 0xAAA); + chip_writeb(flash, 0x55, bios + 0x555); + chip_writeb(flash, 0x80, bios + 0xAAA); + + chip_writeb(flash, 0xAA, bios + 0xAAA); + chip_writeb(flash, 0x55, bios + 0x555); + chip_writeb(flash, 0x10, bios + 0xAAA); + + programmer_delay(10); + toggle_ready_jedec(flash, bios); + + /* FIXME: Check the status register for errors. */ + return 0; +} + +int block_erase_en29lv640b(struct flashctx *flash, unsigned int start, + unsigned int len) +{ + chipaddr bios = flash->virtual_memory; + chipaddr dst = bios + start; + + chip_writeb(flash, 0xAA, bios + 0xAAA); + chip_writeb(flash, 0x55, bios + 0x555); + chip_writeb(flash, 0x80, bios + 0xAAA); + + chip_writeb(flash, 0xAA, bios + 0xAAA); + chip_writeb(flash, 0x55, bios + 0x555); + chip_writeb(flash, 0x30, dst); + + programmer_delay(10); + toggle_ready_jedec(flash, bios); + + /* FIXME: Check the status register for errors. */ + return 0; +} + +int block_erase_chip_en29lv640b(struct flashctx *flash, unsigned int address, + unsigned int blocklen) +{ + if ((address != 0) || (blocklen != flash->total_size * 1024)) { + msg_cerr("%s called with incorrect arguments\n", __func__); + return -1; + } + return erase_en29lv640b(flash); +} |
