spu_read
ret = spu_read(card, reg, (u8 *)&buf, sizeof(buf));
err = spu_read(card, reg, (u8 *)&buf, sizeof(buf));
err = spu_read(card, IF_SPI_CMD_RDWRPORT_REG,
err = spu_read(card, IF_SPI_DATA_RDWRPORT_REG, data, ALIGN(len, 4));