Subversion Repositories openrisc_2011-10-31

/*

 * Simple SPI module driver

 *

 * Julius Baxter, julius.baxter@orsoc.se

 *

 */

#include "board.h"

#include "simple-spi.h"

#include "cpu-utils.h"

#ifdef SPI_NUM_CORES

const int SPI_BASE_ADR[SPI_NUM_CORES] = {SPI_BASE_ADDRESSES_CSV};

#else

// For older builds - need to change them all over to newer format

#ifdef SPI0_BASE

const int SPI_BASE_ADR[1] = {SPI0_BASE};

#else

// No SPI present

const int SPI_BASE_ADR[1] = {-1};

#endif

#endif

void

spi_core_enable(int core)

{

  REG8((SPI_BASE_ADR[core] + SIMPLESPI_SPCR)) |= SIMPLESPI_SPCR_SPE;

}

void

spi_core_disable(int core)

{

  REG8((SPI_BASE_ADR[core] + SIMPLESPI_SPCR)) &= ~SIMPLESPI_SPCR_SPE;

}

void

spi_core_interrupt_enable(int core)

{

  REG8((SPI_BASE_ADR[core] + SIMPLESPI_SPCR)) |= SIMPLESPI_SPCR_SPIE;

}

void

spi_core_interrupt_disable(int core)

{

  REG8((SPI_BASE_ADR[core] + SIMPLESPI_SPCR)) &= ~SIMPLESPI_SPCR_SPIE;

}

void

spi_core_interrupt_flag_clear(int core)

{

  REG8((SPI_BASE_ADR[core] + SIMPLESPI_SPSR)) = SIMPLESPI_SPSR_SPIF;

}

void

spi_core_clock_setup(int core, char polarity, char phase, char rate,

                          char ext_rate)

{

  char spcr = REG8((SPI_BASE_ADR[core] + SIMPLESPI_SPCR));

  if (polarity)

    spcr |= SIMPLESPI_SPCR_CPOL;

  else

    spcr &= ~SIMPLESPI_SPCR_CPOL;

  if (phase)

    spcr |= SIMPLESPI_SPCR_CPHA;

  else

    spcr &= ~SIMPLESPI_SPCR_CPHA;

  spcr = (spcr & ~SIMPLESPI_SPCR_SPR) | (rate & SIMPLESPI_SPCR_SPR);

  REG8((SPI_BASE_ADR[core] + SIMPLESPI_SPCR)) = spcr;

  char sper = REG8((SPI_BASE_ADR[core] + SIMPLESPI_SPER));

  sper = (sper & ~SIMPLESPI_SPER_ESPR) | (ext_rate & SIMPLESPI_SPER_ESPR);

  REG8((SPI_BASE_ADR[core] + SIMPLESPI_SPER)) = sper;

}

void

spi_core_set_int_count(int core, char cnt)

{

  char sper = REG8((SPI_BASE_ADR[core] + SIMPLESPI_SPER));

  sper = (sper & ~SIMPLESPI_SPER_ICNT) | cnt;

  REG8((SPI_BASE_ADR[core] + SIMPLESPI_SPER)) = sper;

}

// No decode on slave select lines, so assert correct bit to select slave

void

spi_core_slave_select(int core, char slave_sel_dec)

{

  REG8((SPI_BASE_ADR[core] + SIMPLESPI_SSPU)) = slave_sel_dec;

}

int

spi_core_data_avail(int core)

{

  return !!!(REG8((SPI_BASE_ADR[core]+SIMPLESPI_SPSR))&SIMPLESPI_SPSR_RFEMPTY);

}

int

spi_core_write_avail(int core)

{

  return !!!(REG8((SPI_BASE_ADR[core]+SIMPLESPI_SPSR))&SIMPLESPI_SPSR_WFFULL);

}

// Should call spi_core_write_avail() before calling this, we don't check

void

spi_core_write_data(int core, char data)

{

  REG8((SPI_BASE_ADR[core] + SIMPLESPI_SPDR)) = data;

}

char

spi_core_read_data(int core)

{

  return REG8((SPI_BASE_ADR[core] + SIMPLESPI_SPDR));

}