PCH_SSNXCR
pch_spi_writereg(data->host, PCH_SSNXCR, SSN_LOW);
pch_spi_writereg(data->host, PCH_SSNXCR, SSN_NO_CONTROL);
pch_spi_writereg(data->host, PCH_SSNXCR, SSN_HIGH);
pch_spi_writereg(data->host, PCH_SSNXCR, SSN_LOW);