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