void nand_setio(DeviceState *dev, uint32_t value)

{

    int i;

    NANDFlashState *s = (NANDFlashState *) dev;

    if (!s->ce && s->cle) {

        if (nand_flash_ids[s->chip_id].options & NAND_SAMSUNG_LP) {

            if (s->cmd == NAND_CMD_READ0 && value == NAND_CMD_LPREAD2)

                return;

            if (value == NAND_CMD_RANDOMREAD1) {

                s->addr &= ~((1 << s->addr_shift) - 1);

                s->addrlen = 0;

                return;

            }

        }

        if (value == NAND_CMD_READ0)

            s->offset = 0;

	else if (value == NAND_CMD_READ1) {

            s->offset = 0x100;

            value = NAND_CMD_READ0;

        }

	else if (value == NAND_CMD_READ2) {

            s->offset = 1 << s->page_shift;

            value = NAND_CMD_READ0;

        }



        s->cmd = value;



        if (s->cmd == NAND_CMD_READSTATUS ||

                s->cmd == NAND_CMD_PAGEPROGRAM2 ||

                s->cmd == NAND_CMD_BLOCKERASE1 ||

                s->cmd == NAND_CMD_BLOCKERASE2 ||

                s->cmd == NAND_CMD_NOSERIALREAD2 ||

                s->cmd == NAND_CMD_RANDOMREAD2 ||

                s->cmd == NAND_CMD_RESET)

            nand_command(s);



        if (s->cmd != NAND_CMD_RANDOMREAD2) {

            s->addrlen = 0;

        }

    }



    if (s->ale) {

        unsigned int shift = s->addrlen * 8;

        unsigned int mask = ~(0xff << shift);

        unsigned int v = value << shift;



        s->addr = (s->addr & mask) | v;

        s->addrlen ++;



        switch (s->addrlen) {

        case 1:

            if (s->cmd == NAND_CMD_READID) {

                nand_command(s);

            }

            break;

        case 2: 

            s->addr <<= (s->buswidth - 1);

            break;

        case 3:

            if (!(nand_flash_ids[s->chip_id].options & NAND_SAMSUNG_LP) &&

                    (s->cmd == NAND_CMD_READ0 ||

                     s->cmd == NAND_CMD_PAGEPROGRAM1)) {

                nand_command(s);

            }

            break;

        case 4:

            if ((nand_flash_ids[s->chip_id].options & NAND_SAMSUNG_LP) &&

                    nand_flash_ids[s->chip_id].size < 256 && 

                    (s->cmd == NAND_CMD_READ0 ||

                     s->cmd == NAND_CMD_PAGEPROGRAM1)) {

                nand_command(s);

            }

            break;

        case 5:

            if ((nand_flash_ids[s->chip_id].options & NAND_SAMSUNG_LP) &&

                    nand_flash_ids[s->chip_id].size >= 256 && 

                    (s->cmd == NAND_CMD_READ0 ||

                     s->cmd == NAND_CMD_PAGEPROGRAM1)) {

                nand_command(s);

            }

            break;

        default:

            break;

        }

    }



    if (!s->cle && !s->ale && s->cmd == NAND_CMD_PAGEPROGRAM1) {

        if (s->iolen < (1 << s->page_shift) + (1 << s->oob_shift)) {

            for (i = s->buswidth; i--; value >>= 8) {

                s->io[s->iolen ++] = (uint8_t) (value & 0xff);

            }

        }

    } else if (!s->cle && !s->ale && s->cmd == NAND_CMD_COPYBACKPRG1) {

        if ((s->addr & ((1 << s->addr_shift) - 1)) <

                (1 << s->page_shift) + (1 << s->oob_shift)) {

            for (i = s->buswidth; i--; s->addr++, value >>= 8) {

                s->io[s->iolen + (s->addr & ((1 << s->addr_shift) - 1))] =

                    (uint8_t) (value & 0xff);

            }

        }

    }

}
