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70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
#ifndef _GPXE_THREEWIRE_H
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#define _GPXE_THREEWIRE_H
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/** @file
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*
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* Three-wire serial interface
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*
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* The Atmel three-wire interface is a subset of the (newer) SPI
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* interface, and is implemented here as a layer on top of the SPI
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* support.
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*/
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#include <gpxe/spi.h>
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/**
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* @defgroup tcmds Three-wire commands
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* @{
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*/
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/** Read data from memory array */
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#define THREEWIRE_READ 0x6
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/** @} */
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extern int threewire_read ( struct nvs_device *nvs, unsigned int address,
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void *data, size_t len );
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/**
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* @defgroup tdevs Three-wire device types
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* @{
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*/
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static inline __attribute__ (( always_inline )) void
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init_at93cx6 ( struct spi_device *device, unsigned int organisation ) {
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device->nvs.word_len_log2 = ( ( organisation == 8 ) ? 0 : 1 );
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device->nvs.block_size = 1;
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device->command_len = 3,
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device->nvs.read = threewire_read;
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}
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/**
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* Initialise Atmel AT93C46 serial EEPROM
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*
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* @v device SPI device
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* @v organisation Word organisation (8 or 16)
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*/
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static inline __attribute__ (( always_inline )) void
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init_at93c46 ( struct spi_device *device, unsigned int organisation ) {
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device->nvs.size = ( 1024 / organisation );
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device->address_len = ( ( organisation == 8 ) ? 7 : 6 );
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init_at93cx6 ( device, organisation );
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}
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/**
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* Initialise Atmel AT93C56 serial EEPROM
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*
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* @v device SPI device
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* @v organisation Word organisation (8 or 16)
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*/
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static inline __attribute__ (( always_inline )) void
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init_at93c56 ( struct spi_device *device, unsigned int organisation ) {
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device->nvs.size = ( 2048 / organisation );
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device->address_len = ( ( organisation == 8 ) ? 9 : 8 );
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init_at93cx6 ( device, organisation );
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}
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/** @} */
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#endif /* _GPXE_THREEWIRE_H */
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