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Add support for the Eon EN29LV640B chip

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This chip needs special command sequences in 8 bit mode. Also, 8 bit
programming needs actually 16bit double byte program.

The chip is found on the Bifferos Bifferboard, for example.

Corresponding to flashrom svn r1521.

Signed-off-by: Rudolf Marek <r.marek@assembler.cz>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
This commit is contained in:
Rudolf Marek
2012-04-14 22:51:40 +00:00
committed by Uwe Hermann
parent 1525b2ad16
commit 47eff6b5b4
5 changed files with 178 additions and 3 deletions
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138
en29lv640b.c Normal file
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/*
* 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);
}