/**
* @INTERNAL
* Write data to the specified SPI4000 address
*
* @param interface Interface the SPI4000 is on. (0 or 1)
* @param address Address to write to
* @param data Data to write
*/
static void __cvmx_spi4000_write(int interface, int address, uint32_t data)
{
int status;
cvmx_twsix_write_ia(0, SPI4000_TWSI_ID(interface), SPI4000_WRITE_ADDRESS_HIGH, 2, 1, address);
cvmx_twsix_write_ia(0, SPI4000_TWSI_ID(interface), SPI4000_WRITE_DATA0, 4, 1, data);
status = cvmx_twsi_read8(SPI4000_TWSI_ID(interface), SPI4000_DO_WRITE);
while ((status == 5) || (status == 0xff))
status = cvmx_twsi_read8(SPI4000_TWSI_ID(interface), SPI4000_GET_WRITE_STATUS);
if (status != 4)
cvmx_dprintf("SPI4000: write failed with status=0x%x\n", status);
}
/**
* @INTERNAL
* Read data from the SPI4000.
*
* @param interface Interface the SPI4000 is on. (0 or 1)
* @param address Address to read from
*
* @return Value at the specified address
*/
static uint32_t __cvmx_spi4000_read(int interface, int address)
{
int status;
uint64_t data;
cvmx_twsix_write_ia(0, SPI4000_TWSI_ID(interface), SPI4000_READ_ADDRESS_HIGH, 2, 1, address);
status = cvmx_twsi_read8(SPI4000_TWSI_ID(interface), SPI4000_DO_READ);
while ((status == 1) || (status == 0xff))
status = cvmx_twsi_read8(SPI4000_TWSI_ID(interface), SPI4000_GET_READ_STATUS);
if (status)
{
cvmx_dprintf("SPI4000: read failed with %d\n", status);
return 0;
}
status = cvmx_twsix_read_ia(0, SPI4000_TWSI_ID(interface), SPI4000_READ_DATA0, 4, 1, &data);
if (status != 4)
{
cvmx_dprintf("SPI4000: read failed with %d\n", status);
return 0;
}
return data;
}
/**
* Reads bytes from memory and copies to eeprom.
* Only supports address size of 2 (16 bit internal address.)
*
* We can only write two bytes at a time to the eeprom, so in some cases
* we need to to a read/modify/write.
*
* Note: can't do single byte write to last address in EEPROM
*
* @param chip chip address
* @param addr internal address
* @param alen address length, must be 0, 1, or 2
* @param buffer memory buffer pointer
* @param len number of bytes to write
*
* @return 0 on Success
* 1 on Failure
*/
int i2c_write(uchar chip, uint addr, int alen, uchar * buffer, int len)
{
int retval;
unsigned int bus;
#ifdef CONFIG_I2C_MULTI_BUS
bus = gd->ogd.current_i2c_bus;
#else
bus = 0;
#endif
debug("%s: Writing device: %#04x address %#04x data %#04x,"
" alen=%d, len=%d\n", __func__, chip, addr, *buffer, alen, len);
if (alen > 2 || !buffer || !len)
return (1);
while (len-- > 0) {
retval =
cvmx_twsix_write_ia(bus, chip, addr++,
1, alen, *buffer++);
if (retval < 0)
return (1);
}
return (0);
}
