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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>
- #include <limits.h>
-
- /**
- * @defgroup tcmds Three-wire commands
- * @{
- */
-
- /** Read data from memory array */
- #define THREEWIRE_READ 0x6
-
- /** Write data to memory array */
- #define THREEWIRE_WRITE 0x5
-
- /** Write enable */
- #define THREEWIRE_EWEN 0x4
-
- /** Address to be used for write enable command */
- #define THREEWIRE_EWEN_ADDRESS INT_MAX
-
- /** Time to wait for write cycles to complete
- *
- * This is sufficient for AT93C46/AT93C56 devices, but may need to be
- * increased in future when other devices are added.
- */
- #define THREEWIRE_WRITE_MDELAY 10
-
- /** @} */
-
- extern int threewire_read ( struct nvs_device *nvs, unsigned int address,
- void *data, size_t len );
- extern int threewire_write ( struct nvs_device *nvs, unsigned int address,
- const void *data, size_t len );
-
- /**
- * @defgroup tdevs Three-wire device types
- * @{
- */
-
- static inline __attribute__ (( always_inline )) void
- init_at93cx6 ( struct spi_device *device, unsigned int organisation ) {
- device->nvs.word_len_log2 = ( ( organisation == 8 ) ? 0 : 1 );
- device->nvs.block_size = 1;
- device->command_len = 3,
- device->nvs.read = threewire_read;
- device->nvs.write = threewire_write;
- }
-
- /**
- * Initialise Atmel AT93C46 serial EEPROM
- *
- * @v device SPI device
- * @v organisation Word organisation (8 or 16)
- */
- static inline __attribute__ (( always_inline )) void
- init_at93c46 ( struct spi_device *device, unsigned int organisation ) {
- device->nvs.size = ( 1024 / organisation );
- device->address_len = ( ( organisation == 8 ) ? 7 : 6 );
- init_at93cx6 ( device, organisation );
- }
-
- /**
- * Initialise Atmel AT93C56 serial EEPROM
- *
- * @v device SPI device
- * @v organisation Word organisation (8 or 16)
- */
- static inline __attribute__ (( always_inline )) void
- init_at93c56 ( struct spi_device *device, unsigned int organisation ) {
- device->nvs.size = ( 2048 / organisation );
- device->address_len = ( ( organisation == 8 ) ? 9 : 8 );
- init_at93cx6 ( device, organisation );
- }
-
- /** @} */
-
- #endif /* _GPXE_THREEWIRE_H */
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