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5de3b9b726
On some flash chips data with addresses more than 24-bit field
can address may be accessed by using Extended Address Register.
The register has 1-byte size and stores high byte of 32-bit address.
Then flash can be read from 3-bytes addressing mode with writing
high byte of address to this Register. By using this way we have
access to full memory of a chip. Some chips may support this method
only.
This patch provides code use Extended Address Register.
Patched files
-------------
chipdrivers.h
+ added functions declarations for spi4ba.c
flash.h
+ feature definitions added
flashrom.c
+ modified switch to 4-bytes addressing to support extended address register
spi4ba.h
+ definitions for 4-bytes addressing JEDEC commands
+ functions declarations from spi4ba.c (same as in chipdrivers.h, just to see)
spi4ba.c
+ functions for write Extended Address Register
+ functions for read/write/erase with Extended Address Register
Change-Id: I09a8aa11de2ca14901f142c67c83c4fa0def4e27
Signed-off-by: Boris Baykov <dev@borisbaykov.com>, Russia, Jan 2014
[clg: ported from
https://www.flashrom.org/pipermail/flashrom/2015-January/013200.html ]
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-on: https://review.coreboot.org/20507
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
75 lines
3.2 KiB
C
75 lines
3.2 KiB
C
/*
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* This file is part of the flashrom project.
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*
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* Copyright (C) 2014 Boris Baykov
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* JEDEC flash chips instructions for 4-bytes addressing
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* SPI chip driver functions for 4-bytes addressing
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*/
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#ifndef __SPI_4BA_H__
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#define __SPI_4BA_H__ 1
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/* Enter 4-byte Address Mode */
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#define JEDEC_ENTER_4_BYTE_ADDR_MODE 0xB7
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#define JEDEC_ENTER_4_BYTE_ADDR_MODE_OUTSIZE 0x01
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#define JEDEC_ENTER_4_BYTE_ADDR_MODE_INSIZE 0x00
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/* Exit 4-byte Address Mode */
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#define JEDEC_EXIT_4_BYTE_ADDR_MODE 0xE9
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#define JEDEC_EXIT_4_BYTE_ADDR_MODE_OUTSIZE 0x01
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#define JEDEC_EXIT_4_BYTE_ADDR_MODE_INSIZE 0x00
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/* Write Extended Address Register */
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#define JEDEC_WRITE_EXT_ADDR_REG 0xC5
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#define JEDEC_WRITE_EXT_ADDR_REG_OUTSIZE 0x02
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#define JEDEC_WRITE_EXT_ADDR_REG_INSIZE 0x00
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/* Read Extended Address Register */
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#define JEDEC_READ_EXT_ADDR_REG 0xC8
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#define JEDEC_READ_EXT_ADDR_REG_OUTSIZE 0x01
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#define JEDEC_READ_EXT_ADDR_REG_INSIZE 0x01
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/* enter 4-bytes addressing mode */
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int spi_enter_4ba_b7(struct flashctx *flash);
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int spi_enter_4ba_b7_we(struct flashctx *flash);
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/* read/write flash bytes in 4-bytes addressing mode */
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int spi_byte_program_4ba(struct flashctx *flash, unsigned int addr, uint8_t databyte);
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int spi_nbyte_program_4ba(struct flashctx *flash, unsigned int addr, const uint8_t *bytes, unsigned int len);
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int spi_nbyte_read_4ba(struct flashctx *flash, unsigned int addr, uint8_t *bytes, unsigned int len);
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/* erase flash bytes in 4-bytes addressing mode */
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int spi_block_erase_20_4ba(struct flashctx *flash, unsigned int addr, unsigned int blocklen);
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int spi_block_erase_52_4ba(struct flashctx *flash, unsigned int addr, unsigned int blocklen);
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int spi_block_erase_d8_4ba(struct flashctx *flash, unsigned int addr, unsigned int blocklen);
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/* read/write flash bytes from 3-bytes addressing mode using extended address register */
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int spi_byte_program_4ba_ereg(struct flashctx *flash, unsigned int addr, uint8_t databyte);
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int spi_nbyte_program_4ba_ereg(struct flashctx *flash, unsigned int addr, const uint8_t *bytes, unsigned int len);
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int spi_nbyte_read_4ba_ereg(struct flashctx *flash, unsigned int addr, uint8_t *bytes, unsigned int len);
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/* erase flash bytes from 3-bytes addressing mode using extended address register */
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int spi_block_erase_20_4ba_ereg(struct flashctx *flash, unsigned int addr, unsigned int blocklen);
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int spi_block_erase_52_4ba_ereg(struct flashctx *flash, unsigned int addr, unsigned int blocklen);
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int spi_block_erase_d8_4ba_ereg(struct flashctx *flash, unsigned int addr, unsigned int blocklen);
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#endif /* __SPI_4BA_H__ */
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