ALTR_I2C_TFR_CMD
writel(ALTR_I2C_TFR_CMD_STO, idev->base + ALTR_I2C_TFR_CMD);
writel(data, idev->base + ALTR_I2C_TFR_CMD);
writel(ALTR_I2C_TFR_CMD_STA | addr, idev->base + ALTR_I2C_TFR_CMD);