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| author | Boris Baykov <dev@borisbaykov.com> | 2016-06-11 18:29:02 +0200 |
|---|---|---|
| committer | Nico Huber <nico.h@gmx.de> | 2017-10-15 12:33:37 +0000 |
| commit | 5de3b9b7263196b1d2bf41659ca44c7ea386b8ab (patch) | |
| tree | f3480e7191c83965a9ab97d429f090e07f30a552 /spi4ba.h | |
| parent | aa6c37444c1d1a5944ea8bb3912bb0efe27dffce (diff) | |
| download | flashrom-5de3b9b7263196b1d2bf41659ca44c7ea386b8ab.tar.gz flashrom-5de3b9b7263196b1d2bf41659ca44c7ea386b8ab.tar.bz2 flashrom-5de3b9b7263196b1d2bf41659ca44c7ea386b8ab.zip | |
4BA: Support for 4-bytes addressing via Extended Address Register
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>
Diffstat (limited to 'spi4ba.h')
| -rw-r--r-- | spi4ba.h | 20 |
1 files changed, 20 insertions, 0 deletions
@@ -36,6 +36,16 @@ #define JEDEC_EXIT_4_BYTE_ADDR_MODE_OUTSIZE 0x01 #define JEDEC_EXIT_4_BYTE_ADDR_MODE_INSIZE 0x00 +/* Write Extended Address Register */ +#define JEDEC_WRITE_EXT_ADDR_REG 0xC5 +#define JEDEC_WRITE_EXT_ADDR_REG_OUTSIZE 0x02 +#define JEDEC_WRITE_EXT_ADDR_REG_INSIZE 0x00 + +/* Read Extended Address Register */ +#define JEDEC_READ_EXT_ADDR_REG 0xC8 +#define JEDEC_READ_EXT_ADDR_REG_OUTSIZE 0x01 +#define JEDEC_READ_EXT_ADDR_REG_INSIZE 0x01 + /* enter 4-bytes addressing mode */ int spi_enter_4ba_b7(struct flashctx *flash); int spi_enter_4ba_b7_we(struct flashctx *flash); @@ -50,5 +60,15 @@ int spi_block_erase_20_4ba(struct flashctx *flash, unsigned int addr, unsigned i int spi_block_erase_52_4ba(struct flashctx *flash, unsigned int addr, unsigned int blocklen); int spi_block_erase_d8_4ba(struct flashctx *flash, unsigned int addr, unsigned int blocklen); +/* read/write flash bytes from 3-bytes addressing mode using extended address register */ +int spi_byte_program_4ba_ereg(struct flashctx *flash, unsigned int addr, uint8_t databyte); +int spi_nbyte_program_4ba_ereg(struct flashctx *flash, unsigned int addr, const uint8_t *bytes, unsigned int len); +int spi_nbyte_read_4ba_ereg(struct flashctx *flash, unsigned int addr, uint8_t *bytes, unsigned int len); + +/* erase flash bytes from 3-bytes addressing mode using extended address register */ +int spi_block_erase_20_4ba_ereg(struct flashctx *flash, unsigned int addr, unsigned int blocklen); +int spi_block_erase_52_4ba_ereg(struct flashctx *flash, unsigned int addr, unsigned int blocklen); +int spi_block_erase_d8_4ba_ereg(struct flashctx *flash, unsigned int addr, unsigned int blocklen); + #endif /* __SPI_4BA_H__ */ |