nand.c.svn-base

我们自己开发的一个OSEK操作系统！不知道可不可以？

{
    s->cle = cle;
    s->ale = ale;
    s->ce = ce;
    s->wp = wp;
    s->gnd = gnd;
    if (wp)
        s->status |= NAND_IOSTATUS_UNPROTCT;
    else
        s->status &= ~NAND_IOSTATUS_UNPROTCT;
}

void nand_getpins(struct nand_flash_s *s, int *rb)
{
    *rb = 1;
}

void nand_setio(struct nand_flash_s *s, uint8_t value)
{
    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;
            s->addr = 0;
        }
    }

    if (s->ale) {
        s->addr |= value << (s->addrlen * 8);
        s->addrlen ++;

        if (s->addrlen == 1 && s->cmd == NAND_CMD_READID)
            nand_command(s);

        if (!(nand_flash_ids[s->chip_id].options & NAND_SAMSUNG_LP) &&
                s->addrlen == 3 && (
                    s->cmd == NAND_CMD_READ0 ||
                    s->cmd == NAND_CMD_PAGEPROGRAM1))
            nand_command(s);
        if ((nand_flash_ids[s->chip_id].options & NAND_SAMSUNG_LP) &&
               s->addrlen == 4 && (
                    s->cmd == NAND_CMD_READ0 ||
                    s->cmd == NAND_CMD_PAGEPROGRAM1))
            nand_command(s);
    }

    if (!s->cle && !s->ale && s->cmd == NAND_CMD_PAGEPROGRAM1) {
        if (s->iolen < (1 << s->page_shift) + (1 << s->oob_shift))
            s->io[s->iolen ++] = value;
    } 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)) {
            s->io[s->iolen + (s->addr & ((1 << s->addr_shift) - 1))] = value;
            s->addr ++;
        }
    }
}

uint8_t nand_getio(struct nand_flash_s *s)
{
    int offset;

    /* Allow sequential reading */
    if (!s->iolen && s->cmd == NAND_CMD_READ0) {
        offset = (s->addr & ((1 << s->addr_shift) - 1)) + s->offset;
        s->offset = 0;

        s->blk_load(s, s->addr, offset);
        if (s->gnd)
            s->iolen = (1 << s->page_shift) - offset;
        else
            s->iolen = (1 << s->page_shift) + (1 << s->oob_shift) - offset;
    }

    if (s->ce || s->iolen <= 0)
        return 0;

    s->iolen --;
    return *(s->ioaddr ++);
}

struct nand_flash_s *nand_init(int manf_id, int chip_id)
{
    int pagesize;
    struct nand_flash_s *s;
    int index;

    if (nand_flash_ids[chip_id].size == 0) {
        cpu_abort(cpu_single_env, "%s: Unsupported NAND chip ID.\n",
                        __FUNCTION__);
    }
    index = drive_get_index(IF_MTD, 0, 0);
    if (index == -1) {
        cpu_abort(cpu_single_env, "%s: missing MTD device\n",
                        __FUNCTION__);
    }

    s = (struct nand_flash_s *) qemu_mallocz(sizeof(struct nand_flash_s));
    s->bdrv = drives_table[index].bdrv;
    s->manf_id = manf_id;
    s->chip_id = chip_id;
    s->size = nand_flash_ids[s->chip_id].size << 20;
    if (nand_flash_ids[s->chip_id].options & NAND_SAMSUNG_LP) {
        s->page_shift = 11;
        s->erase_shift = 6;
    } else {
        s->page_shift = nand_flash_ids[s->chip_id].page_shift;
        s->erase_shift = nand_flash_ids[s->chip_id].erase_shift;
    }

    switch (1 << s->page_shift) {
    case 256:
        nand_init_256(s);
        break;
    case 512:
        nand_init_512(s);
        break;
    case 2048:
        nand_init_2048(s);
        break;
    default:
        cpu_abort(cpu_single_env, "%s: Unsupported NAND block size.\n",
                        __FUNCTION__);
    }

    pagesize = 1 << s->oob_shift;
    s->mem_oob = 1;
    if (s->bdrv && bdrv_getlength(s->bdrv) >=
                    (s->pages << s->page_shift) + (s->pages << s->oob_shift)) {
        pagesize = 0;
        s->mem_oob = 0;
    }

    if (!s->bdrv)
        pagesize += 1 << s->page_shift;
    if (pagesize)
        s->storage = (uint8_t *) memset(qemu_malloc(s->pages * pagesize),
                        0xff, s->pages * pagesize);

    register_savevm("nand", nand_iid ++, 0, nand_save, nand_load, s);

    return s;
}

void nand_done(struct nand_flash_s *s)
{
    if (s->bdrv) {
        bdrv_close(s->bdrv);
        bdrv_delete(s->bdrv);
    }

    if (!s->bdrv || s->mem_oob)
        free(s->storage);

    free(s);
}

#else

/* Program a single page */
static void glue(nand_blk_write_, PAGE_SIZE)(struct nand_flash_s *s)
{
    uint32_t off, page, sector, soff;
    uint8_t iobuf[(PAGE_SECTORS + 2) * 0x200];
    if (PAGE(s->addr) >= s->pages)
        return;

    if (!s->bdrv) {
        memcpy(s->storage + PAGE_START(s->addr) + (s->addr & PAGE_MASK) +
                        s->offset, s->io, s->iolen);
    } else if (s->mem_oob) {
        sector = SECTOR(s->addr);
        off = (s->addr & PAGE_MASK) + s->offset;
        soff = SECTOR_OFFSET(s->addr);
        if (bdrv_read(s->bdrv, sector, iobuf, PAGE_SECTORS) == -1) {
            printf("%s: read error in sector %i\n", __FUNCTION__, sector);
            return;
        }

        memcpy(iobuf + (soff | off), s->io, MIN(s->iolen, PAGE_SIZE - off));
        if (off + s->iolen > PAGE_SIZE) {
            page = PAGE(s->addr);
            memcpy(s->storage + (page << OOB_SHIFT), s->io + PAGE_SIZE - off,
                            MIN(OOB_SIZE, off + s->iolen - PAGE_SIZE));
        }

        if (bdrv_write(s->bdrv, sector, iobuf, PAGE_SECTORS) == -1)
            printf("%s: write error in sector %i\n", __FUNCTION__, sector);
    } else {
        off = PAGE_START(s->addr) + (s->addr & PAGE_MASK) + s->offset;
        sector = off >> 9;
        soff = off & 0x1ff;
        if (bdrv_read(s->bdrv, sector, iobuf, PAGE_SECTORS + 2) == -1) {
            printf("%s: read error in sector %i\n", __FUNCTION__, sector);
            return;
        }

        memcpy(iobuf + soff, s->io, s->iolen);

        if (bdrv_write(s->bdrv, sector, iobuf, PAGE_SECTORS + 2) == -1)
            printf("%s: write error in sector %i\n", __FUNCTION__, sector);
    }
    s->offset = 0;
}

/* Erase a single block */
static void glue(nand_blk_erase_, PAGE_SIZE)(struct nand_flash_s *s)
{
    uint32_t i, page, addr;
    uint8_t iobuf[0x200] = { [0 ... 0x1ff] = 0xff, };
    addr = s->addr & ~((1 << (ADDR_SHIFT + s->erase_shift)) - 1);

    if (PAGE(addr) >= s->pages)
        return;

    if (!s->bdrv) {
        memset(s->storage + PAGE_START(addr),
                        0xff, (PAGE_SIZE + OOB_SIZE) << s->erase_shift);
    } else if (s->mem_oob) {
        memset(s->storage + (PAGE(addr) << OOB_SHIFT),
                        0xff, OOB_SIZE << s->erase_shift);
        i = SECTOR(addr);
        page = SECTOR(addr + (ADDR_SHIFT + s->erase_shift));
        for (; i < page; i ++)
            if (bdrv_write(s->bdrv, i, iobuf, 1) == -1)
                printf("%s: write error in sector %i\n", __FUNCTION__, i);
    } else {
        addr = PAGE_START(addr);
        page = addr >> 9;
        if (bdrv_read(s->bdrv, page, iobuf, 1) == -1)
            printf("%s: read error in sector %i\n", __FUNCTION__, page);
        memset(iobuf + (addr & 0x1ff), 0xff, (~addr & 0x1ff) + 1);
        if (bdrv_write(s->bdrv, page, iobuf, 1) == -1)
            printf("%s: write error in sector %i\n", __FUNCTION__, page);

        memset(iobuf, 0xff, 0x200);
        i = (addr & ~0x1ff) + 0x200;
        for (addr += ((PAGE_SIZE + OOB_SIZE) << s->erase_shift) - 0x200;
                        i < addr; i += 0x200)
            if (bdrv_write(s->bdrv, i >> 9, iobuf, 1) == -1)
                printf("%s: write error in sector %i\n", __FUNCTION__, i >> 9);

        page = i >> 9;
        if (bdrv_read(s->bdrv, page, iobuf, 1) == -1)
            printf("%s: read error in sector %i\n", __FUNCTION__, page);
        memset(iobuf, 0xff, ((addr - 1) & 0x1ff) + 1);
        if (bdrv_write(s->bdrv, page, iobuf, 1) == -1)
            printf("%s: write error in sector %i\n", __FUNCTION__, page);
    }
}

static void glue(nand_blk_load_, PAGE_SIZE)(struct nand_flash_s *s,
                uint32_t addr, int offset)
{
    if (PAGE(addr) >= s->pages)
        return;

    if (s->bdrv) {
        if (s->mem_oob) {
            if (bdrv_read(s->bdrv, SECTOR(addr), s->io, PAGE_SECTORS) == -1)
                printf("%s: read error in sector %i\n",
                                __FUNCTION__, SECTOR(addr));
            memcpy(s->io + SECTOR_OFFSET(s->addr) + PAGE_SIZE,
                            s->storage + (PAGE(s->addr) << OOB_SHIFT),
                            OOB_SIZE);
            s->ioaddr = s->io + SECTOR_OFFSET(s->addr) + offset;
        } else {
            if (bdrv_read(s->bdrv, PAGE_START(addr) >> 9,
                                    s->io, (PAGE_SECTORS + 2)) == -1)
                printf("%s: read error in sector %i\n",
                                __FUNCTION__, PAGE_START(addr) >> 9);
            s->ioaddr = s->io + (PAGE_START(addr) & 0x1ff) + offset;
        }
    } else {
        memcpy(s->io, s->storage + PAGE_START(s->addr) +
                        offset, PAGE_SIZE + OOB_SIZE - offset);
        s->ioaddr = s->io;
    }

    s->addr &= PAGE_SIZE - 1;
    s->addr += PAGE_SIZE;
}

static void glue(nand_init_, PAGE_SIZE)(struct nand_flash_s *s)
{
    s->oob_shift = PAGE_SHIFT - 5;
    s->pages = s->size >> PAGE_SHIFT;
    s->addr_shift = ADDR_SHIFT;

    s->blk_erase = glue(nand_blk_erase_, PAGE_SIZE);
    s->blk_write = glue(nand_blk_write_, PAGE_SIZE);
    s->blk_load = glue(nand_blk_load_, PAGE_SIZE);
}

# undef PAGE_SIZE
# undef PAGE_SHIFT
# undef PAGE_SECTORS
# undef ADDR_SHIFT
#endif	/* NAND_IO */