diff options
Diffstat (limited to 'drivers/mtd/nand/nand.c')
| -rw-r--r-- | drivers/mtd/nand/nand.c | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/drivers/mtd/nand/nand.c b/drivers/mtd/nand/nand.c new file mode 100644 index 0000000000..4927231c17 --- /dev/null +++ b/drivers/mtd/nand/nand.c @@ -0,0 +1,247 @@ +/* + * (C) Copyright 2005 + * 2N Telekomunikace, a.s. <www.2n.cz> + * Ladislav Michl <michl@2n.cz> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ +#include <common.h> +#include <linux/mtd/nand.h> +#include <linux/mtd/mtd.h> +#include <init.h> +#include <xfuncs.h> +#include <driver.h> +#include <malloc.h> +#include <ioctl.h> +#include <nand.h> +#include <errno.h> + +static ssize_t nand_read(struct cdev *cdev, void* buf, size_t count, ulong offset, ulong flags) +{ + struct mtd_info *info = cdev->priv; + size_t retlen; + int ret; + + debug("nand_read: 0x%08x 0x%08x\n", offset, count); + + ret = info->read(info, offset, count, &retlen, buf); + + if(ret) { + printf("err %d\n", ret); + return ret; + } + return retlen; +} + +#define NOTALIGNED(x) (x & (info->writesize - 1)) != 0 + +static int all_ff(const void *buf, int len) +{ + int i; + const uint8_t *p = buf; + + for (i = 0; i < len; i++) + if (p[i] != 0xFF) + return 0; + return 1; +} + +static ssize_t nand_write(struct cdev* cdev, const void *buf, size_t _count, ulong offset, ulong flags) +{ + struct mtd_info *info = cdev->priv; + size_t retlen, now; + int ret = 0; + void *wrbuf = NULL; + size_t count = _count; + + if (NOTALIGNED(offset)) { + printf("offset 0x%08x not page aligned\n", offset); + return -EINVAL; + } + + debug("write: 0x%08x 0x%08x\n", offset, count); + + while (count) { + now = count > info->writesize ? info->writesize : count; + + if (NOTALIGNED(now)) { + debug("not aligned: %d %d\n", info->writesize, (offset % info->writesize)); + wrbuf = xmalloc(info->writesize); + memset(wrbuf, 0xff, info->writesize); + memcpy(wrbuf + (offset % info->writesize), buf, now); + if (!all_ff(wrbuf, info->writesize)) + ret = info->write(info, offset & ~(info->writesize - 1), + info->writesize, &retlen, wrbuf); + free(wrbuf); + } else { + if (!all_ff(buf, info->writesize)) + ret = info->write(info, offset, now, &retlen, buf); + debug("offset: 0x%08x now: 0x%08x retlen: 0x%08x\n", offset, now, retlen); + } + if (ret) + goto out; + + offset += now; + count -= now; + buf += now; + } + +out: + return ret ? ret : _count; +} + +static int nand_ioctl(struct cdev *cdev, int request, void *buf) +{ + struct mtd_info *info = cdev->priv; + struct mtd_info_user *user = buf; + + switch (request) { + case MEMGETBADBLOCK: + debug("MEMGETBADBLOCK: 0x%08x\n", (off_t)buf); + return info->block_isbad(info, (off_t)buf); + case MEMSETBADBLOCK: + debug("MEMSETBADBLOCK: 0x%08x\n", (off_t)buf); + return info->block_markbad(info, (off_t)buf); + case MEMGETINFO: + user->type = info->type; + user->flags = info->flags; + user->size = info->size; + user->erasesize = info->erasesize; + user->oobsize = info->oobsize; + /* The below fields are obsolete */ + user->ecctype = -1; + user->eccsize = 0; + return 0; + } + + return 0; +} + +static ssize_t nand_erase(struct cdev *cdev, size_t count, unsigned long offset) +{ + struct mtd_info *info = cdev->priv; + struct erase_info erase; + int ret; + + memset(&erase, 0, sizeof(erase)); + erase.mtd = info; + erase.addr = offset; + erase.len = info->erasesize; + + while (count > 0) { + debug("erase %d %d\n", erase.addr, erase.len); + + ret = info->block_isbad(info, erase.addr); + if (ret > 0) { + printf("Skipping bad block at 0x%08x\n", erase.addr); + } else { + ret = info->erase(info, &erase); + if (ret) + return ret; + } + + erase.addr += info->erasesize; + count -= count > info->erasesize ? info->erasesize : count; + } + + return 0; +} +#if 0 +static char* mtd_get_size(struct device_d *, struct param_d *param) +{ + static char +} +#endif + +static struct file_operations nand_ops = { + .read = nand_read, + .write = nand_write, + .ioctl = nand_ioctl, + .lseek = dev_lseek_default, + .erase = nand_erase, +}; + +static ssize_t nand_read_oob(struct cdev *cdev, void *buf, size_t count, ulong offset, ulong flags) +{ + struct mtd_info *info = cdev->priv; + struct nand_chip *chip = info->priv; + struct mtd_oob_ops ops; + int ret; + + if (count < info->oobsize) + return -EINVAL; + + ops.mode = MTD_OOB_RAW; + ops.ooboffs = 0; + ops.ooblen = info->oobsize; + ops.oobbuf = buf; + ops.datbuf = NULL; + ops.len = info->oobsize; + + offset /= info->oobsize; + ret = info->read_oob(info, offset << chip->page_shift, &ops); + if (ret) + return ret; + + return info->oobsize; +} + +static struct file_operations nand_ops_oob = { + .read = nand_read_oob, + .ioctl = nand_ioctl, + .lseek = dev_lseek_default, +}; + +int add_mtd_device(struct mtd_info *mtd) +{ + struct nand_chip *chip = mtd->priv; + char str[16]; + + strcpy(mtd->class_dev.name, "nand"); + register_device(&mtd->class_dev); + + mtd->cdev.ops = &nand_ops; + mtd->cdev.size = mtd->size; + mtd->cdev.name = asprintf("nand%d", mtd->class_dev.id); + mtd->cdev.priv = mtd; + mtd->cdev.dev = &mtd->class_dev; + + sprintf(str, "%u", mtd->size); + dev_add_param_fixed(&mtd->class_dev, "size", str); + + devfs_create(&mtd->cdev); + + mtd->cdev_oob.ops = &nand_ops_oob; + mtd->cdev_oob.size = (mtd->size >> chip->page_shift) * mtd->oobsize; + mtd->cdev_oob.name = asprintf("nand_oob%d", mtd->class_dev.id); + mtd->cdev_oob.priv = mtd; + mtd->cdev_oob.dev = &mtd->class_dev; + devfs_create(&mtd->cdev_oob); + + return 0; +} + +int del_mtd_device (struct mtd_info *mtd) +{ + unregister_device(&mtd->class_dev); + free(mtd->cdev_oob.name); + free(mtd->param_size.value); + free(mtd->cdev.name); + return 0; +} + |