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e1379b56e9
Atmel devices in this family have some quirks not found in other similar chips - they do not support a sequential read of the entire EEPROM contents, and the control word sent at the start of each operation varies in bit length. This commit adds quirk support to the driver and modifies the read implementation to support non-sequential reads for consistency with other misc/eeprom drivers. Tested on a custom Freescale VF610-based platform, with an AT93C46D device attached via dspi2. The spi-gpio driver was used to allow the necessary non-byte-sized transfers. Signed-off-by: Cory Tusar <cory.tusar@pid1solutions.com> Tested-by: Chris Healy <chris.healy@zii.aero> Reviewed-by: Vladimir Zapolskiy <vz@mleia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
25 lines
677 B
C
25 lines
677 B
C
/*
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* Module: eeprom_93xx46
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* platform description for 93xx46 EEPROMs.
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*/
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struct eeprom_93xx46_platform_data {
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unsigned char flags;
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#define EE_ADDR8 0x01 /* 8 bit addr. cfg */
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#define EE_ADDR16 0x02 /* 16 bit addr. cfg */
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#define EE_READONLY 0x08 /* forbid writing */
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unsigned int quirks;
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/* Single word read transfers only; no sequential read. */
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#define EEPROM_93XX46_QUIRK_SINGLE_WORD_READ (1 << 0)
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/* Instructions such as EWEN are (addrlen + 2) in length. */
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#define EEPROM_93XX46_QUIRK_INSTRUCTION_LENGTH (1 << 1)
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/*
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* optional hooks to control additional logic
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* before and after spi transfer.
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*/
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void (*prepare)(void *);
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void (*finish)(void *);
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};
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