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extern void spi_init (int slave, int fq, int bit_nb, int lsb, int tx_pol, int rx_pol);

extern unsigned long spi_xmit (unsigned long val);

/* SPI register offsets */

#define SPI_RX          0x00

#define SPI_TX          0x00

#define SPI_CTRL        0x04

#define SPI_DEVIDER     0x08

#define SPI_SS          0x0c

/* SPI control register bits */

#define SPI_CTRL_IE             0x00000200

#define SPI_CTRL_LSB            0x00000100

#define SPI_CTRL_TX_NEGEDGE     0x00000004

#define SPI_CTRL_RX_NEGEDGE     0x00000002

#define SPI_CTRL_GO             0x00000001

#define SPI_CTRL_BSY            0x00000001