diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/mtd/mtdconcat.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/mtd/mtdconcat.c | 951 |
1 files changed, 0 insertions, 951 deletions
diff --git a/ANDROID_3.4.5/drivers/mtd/mtdconcat.c b/ANDROID_3.4.5/drivers/mtd/mtdconcat.c deleted file mode 100644 index b9000563..00000000 --- a/ANDROID_3.4.5/drivers/mtd/mtdconcat.c +++ /dev/null @@ -1,951 +0,0 @@ -/* - * MTD device concatenation layer - * - * Copyright © 2002 Robert Kaiser <rkaiser@sysgo.de> - * Copyright © 2002-2010 David Woodhouse <dwmw2@infradead.org> - * - * NAND support by Christian Gan <cgan@iders.ca> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - * - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/slab.h> -#include <linux/sched.h> -#include <linux/types.h> -#include <linux/backing-dev.h> - -#include <linux/mtd/mtd.h> -#include <linux/mtd/concat.h> - -#include <asm/div64.h> - -/* - * Our storage structure: - * Subdev points to an array of pointers to struct mtd_info objects - * which is allocated along with this structure - * - */ -struct mtd_concat { - struct mtd_info mtd; - int num_subdev; - struct mtd_info **subdev; -}; - -/* - * how to calculate the size required for the above structure, - * including the pointer array subdev points to: - */ -#define SIZEOF_STRUCT_MTD_CONCAT(num_subdev) \ - ((sizeof(struct mtd_concat) + (num_subdev) * sizeof(struct mtd_info *))) - -/* - * Given a pointer to the MTD object in the mtd_concat structure, - * we can retrieve the pointer to that structure with this macro. - */ -#define CONCAT(x) ((struct mtd_concat *)(x)) - -/* - * MTD methods which look up the relevant subdevice, translate the - * effective address and pass through to the subdevice. - */ - -static int -concat_read(struct mtd_info *mtd, loff_t from, size_t len, - size_t * retlen, u_char * buf) -{ - struct mtd_concat *concat = CONCAT(mtd); - int ret = 0, err; - int i; - - for (i = 0; i < concat->num_subdev; i++) { - struct mtd_info *subdev = concat->subdev[i]; - size_t size, retsize; - - if (from >= subdev->size) { - /* Not destined for this subdev */ - size = 0; - from -= subdev->size; - continue; - } - if (from + len > subdev->size) - /* First part goes into this subdev */ - size = subdev->size - from; - else - /* Entire transaction goes into this subdev */ - size = len; - - err = mtd_read(subdev, from, size, &retsize, buf); - - /* Save information about bitflips! */ - if (unlikely(err)) { - if (mtd_is_eccerr(err)) { - mtd->ecc_stats.failed++; - ret = err; - } else if (mtd_is_bitflip(err)) { - mtd->ecc_stats.corrected++; - /* Do not overwrite -EBADMSG !! */ - if (!ret) - ret = err; - } else - return err; - } - - *retlen += retsize; - len -= size; - if (len == 0) - return ret; - - buf += size; - from = 0; - } - return -EINVAL; -} - -static int -concat_write(struct mtd_info *mtd, loff_t to, size_t len, - size_t * retlen, const u_char * buf) -{ - struct mtd_concat *concat = CONCAT(mtd); - int err = -EINVAL; - int i; - - for (i = 0; i < concat->num_subdev; i++) { - struct mtd_info *subdev = concat->subdev[i]; - size_t size, retsize; - - if (to >= subdev->size) { - size = 0; - to -= subdev->size; - continue; - } - if (to + len > subdev->size) - size = subdev->size - to; - else - size = len; - - err = mtd_write(subdev, to, size, &retsize, buf); - if (err) - break; - - *retlen += retsize; - len -= size; - if (len == 0) - break; - - err = -EINVAL; - buf += size; - to = 0; - } - return err; -} - -static int -concat_writev(struct mtd_info *mtd, const struct kvec *vecs, - unsigned long count, loff_t to, size_t * retlen) -{ - struct mtd_concat *concat = CONCAT(mtd); - struct kvec *vecs_copy; - unsigned long entry_low, entry_high; - size_t total_len = 0; - int i; - int err = -EINVAL; - - /* Calculate total length of data */ - for (i = 0; i < count; i++) - total_len += vecs[i].iov_len; - - /* Check alignment */ - if (mtd->writesize > 1) { - uint64_t __to = to; - if (do_div(__to, mtd->writesize) || (total_len % mtd->writesize)) - return -EINVAL; - } - - /* make a copy of vecs */ - vecs_copy = kmemdup(vecs, sizeof(struct kvec) * count, GFP_KERNEL); - if (!vecs_copy) - return -ENOMEM; - - entry_low = 0; - for (i = 0; i < concat->num_subdev; i++) { - struct mtd_info *subdev = concat->subdev[i]; - size_t size, wsize, retsize, old_iov_len; - - if (to >= subdev->size) { - to -= subdev->size; - continue; - } - - size = min_t(uint64_t, total_len, subdev->size - to); - wsize = size; /* store for future use */ - - entry_high = entry_low; - while (entry_high < count) { - if (size <= vecs_copy[entry_high].iov_len) - break; - size -= vecs_copy[entry_high++].iov_len; - } - - old_iov_len = vecs_copy[entry_high].iov_len; - vecs_copy[entry_high].iov_len = size; - - err = mtd_writev(subdev, &vecs_copy[entry_low], - entry_high - entry_low + 1, to, &retsize); - - vecs_copy[entry_high].iov_len = old_iov_len - size; - vecs_copy[entry_high].iov_base += size; - - entry_low = entry_high; - - if (err) - break; - - *retlen += retsize; - total_len -= wsize; - - if (total_len == 0) - break; - - err = -EINVAL; - to = 0; - } - - kfree(vecs_copy); - return err; -} - -static int -concat_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) -{ - struct mtd_concat *concat = CONCAT(mtd); - struct mtd_oob_ops devops = *ops; - int i, err, ret = 0; - - ops->retlen = ops->oobretlen = 0; - - for (i = 0; i < concat->num_subdev; i++) { - struct mtd_info *subdev = concat->subdev[i]; - - if (from >= subdev->size) { - from -= subdev->size; - continue; - } - - /* partial read ? */ - if (from + devops.len > subdev->size) - devops.len = subdev->size - from; - - err = mtd_read_oob(subdev, from, &devops); - ops->retlen += devops.retlen; - ops->oobretlen += devops.oobretlen; - - /* Save information about bitflips! */ - if (unlikely(err)) { - if (mtd_is_eccerr(err)) { - mtd->ecc_stats.failed++; - ret = err; - } else if (mtd_is_bitflip(err)) { - mtd->ecc_stats.corrected++; - /* Do not overwrite -EBADMSG !! */ - if (!ret) - ret = err; - } else - return err; - } - - if (devops.datbuf) { - devops.len = ops->len - ops->retlen; - if (!devops.len) - return ret; - devops.datbuf += devops.retlen; - } - if (devops.oobbuf) { - devops.ooblen = ops->ooblen - ops->oobretlen; - if (!devops.ooblen) - return ret; - devops.oobbuf += ops->oobretlen; - } - - from = 0; - } - return -EINVAL; -} - -static int -concat_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops) -{ - struct mtd_concat *concat = CONCAT(mtd); - struct mtd_oob_ops devops = *ops; - int i, err; - - if (!(mtd->flags & MTD_WRITEABLE)) - return -EROFS; - - ops->retlen = ops->oobretlen = 0; - - for (i = 0; i < concat->num_subdev; i++) { - struct mtd_info *subdev = concat->subdev[i]; - - if (to >= subdev->size) { - to -= subdev->size; - continue; - } - - /* partial write ? */ - if (to + devops.len > subdev->size) - devops.len = subdev->size - to; - - err = mtd_write_oob(subdev, to, &devops); - ops->retlen += devops.oobretlen; - if (err) - return err; - - if (devops.datbuf) { - devops.len = ops->len - ops->retlen; - if (!devops.len) - return 0; - devops.datbuf += devops.retlen; - } - if (devops.oobbuf) { - devops.ooblen = ops->ooblen - ops->oobretlen; - if (!devops.ooblen) - return 0; - devops.oobbuf += devops.oobretlen; - } - to = 0; - } - return -EINVAL; -} - -static void concat_erase_callback(struct erase_info *instr) -{ - wake_up((wait_queue_head_t *) instr->priv); -} - -static int concat_dev_erase(struct mtd_info *mtd, struct erase_info *erase) -{ - int err; - wait_queue_head_t waitq; - DECLARE_WAITQUEUE(wait, current); - - /* - * This code was stol^H^H^H^Hinspired by mtdchar.c - */ - init_waitqueue_head(&waitq); - - erase->mtd = mtd; - erase->callback = concat_erase_callback; - erase->priv = (unsigned long) &waitq; - - /* - * FIXME: Allow INTERRUPTIBLE. Which means - * not having the wait_queue head on the stack. - */ - err = mtd_erase(mtd, erase); - if (!err) { - set_current_state(TASK_UNINTERRUPTIBLE); - add_wait_queue(&waitq, &wait); - if (erase->state != MTD_ERASE_DONE - && erase->state != MTD_ERASE_FAILED) - schedule(); - remove_wait_queue(&waitq, &wait); - set_current_state(TASK_RUNNING); - - err = (erase->state == MTD_ERASE_FAILED) ? -EIO : 0; - } - return err; -} - -static int concat_erase(struct mtd_info *mtd, struct erase_info *instr) -{ - struct mtd_concat *concat = CONCAT(mtd); - struct mtd_info *subdev; - int i, err; - uint64_t length, offset = 0; - struct erase_info *erase; - - /* - * Check for proper erase block alignment of the to-be-erased area. - * It is easier to do this based on the super device's erase - * region info rather than looking at each particular sub-device - * in turn. - */ - if (!concat->mtd.numeraseregions) { - /* the easy case: device has uniform erase block size */ - if (instr->addr & (concat->mtd.erasesize - 1)) - return -EINVAL; - if (instr->len & (concat->mtd.erasesize - 1)) - return -EINVAL; - } else { - /* device has variable erase size */ - struct mtd_erase_region_info *erase_regions = - concat->mtd.eraseregions; - - /* - * Find the erase region where the to-be-erased area begins: - */ - for (i = 0; i < concat->mtd.numeraseregions && - instr->addr >= erase_regions[i].offset; i++) ; - --i; - - /* - * Now erase_regions[i] is the region in which the - * to-be-erased area begins. Verify that the starting - * offset is aligned to this region's erase size: - */ - if (i < 0 || instr->addr & (erase_regions[i].erasesize - 1)) - return -EINVAL; - - /* - * now find the erase region where the to-be-erased area ends: - */ - for (; i < concat->mtd.numeraseregions && - (instr->addr + instr->len) >= erase_regions[i].offset; - ++i) ; - --i; - /* - * check if the ending offset is aligned to this region's erase size - */ - if (i < 0 || ((instr->addr + instr->len) & - (erase_regions[i].erasesize - 1))) - return -EINVAL; - } - - /* make a local copy of instr to avoid modifying the caller's struct */ - erase = kmalloc(sizeof (struct erase_info), GFP_KERNEL); - - if (!erase) - return -ENOMEM; - - *erase = *instr; - length = instr->len; - - /* - * find the subdevice where the to-be-erased area begins, adjust - * starting offset to be relative to the subdevice start - */ - for (i = 0; i < concat->num_subdev; i++) { - subdev = concat->subdev[i]; - if (subdev->size <= erase->addr) { - erase->addr -= subdev->size; - offset += subdev->size; - } else { - break; - } - } - - /* must never happen since size limit has been verified above */ - BUG_ON(i >= concat->num_subdev); - - /* now do the erase: */ - err = 0; - for (; length > 0; i++) { - /* loop for all subdevices affected by this request */ - subdev = concat->subdev[i]; /* get current subdevice */ - - /* limit length to subdevice's size: */ - if (erase->addr + length > subdev->size) - erase->len = subdev->size - erase->addr; - else - erase->len = length; - - length -= erase->len; - if ((err = concat_dev_erase(subdev, erase))) { - /* sanity check: should never happen since - * block alignment has been checked above */ - BUG_ON(err == -EINVAL); - if (erase->fail_addr != MTD_FAIL_ADDR_UNKNOWN) - instr->fail_addr = erase->fail_addr + offset; - break; - } - /* - * erase->addr specifies the offset of the area to be - * erased *within the current subdevice*. It can be - * non-zero only the first time through this loop, i.e. - * for the first subdevice where blocks need to be erased. - * All the following erases must begin at the start of the - * current subdevice, i.e. at offset zero. - */ - erase->addr = 0; - offset += subdev->size; - } - instr->state = erase->state; - kfree(erase); - if (err) - return err; - - if (instr->callback) - instr->callback(instr); - return 0; -} - -static int concat_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) -{ - struct mtd_concat *concat = CONCAT(mtd); - int i, err = -EINVAL; - - for (i = 0; i < concat->num_subdev; i++) { - struct mtd_info *subdev = concat->subdev[i]; - uint64_t size; - - if (ofs >= subdev->size) { - size = 0; - ofs -= subdev->size; - continue; - } - if (ofs + len > subdev->size) - size = subdev->size - ofs; - else - size = len; - - err = mtd_lock(subdev, ofs, size); - if (err) - break; - - len -= size; - if (len == 0) - break; - - err = -EINVAL; - ofs = 0; - } - - return err; -} - -static int concat_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) -{ - struct mtd_concat *concat = CONCAT(mtd); - int i, err = 0; - - for (i = 0; i < concat->num_subdev; i++) { - struct mtd_info *subdev = concat->subdev[i]; - uint64_t size; - - if (ofs >= subdev->size) { - size = 0; - ofs -= subdev->size; - continue; - } - if (ofs + len > subdev->size) - size = subdev->size - ofs; - else - size = len; - - err = mtd_unlock(subdev, ofs, size); - if (err) - break; - - len -= size; - if (len == 0) - break; - - err = -EINVAL; - ofs = 0; - } - - return err; -} - -static void concat_sync(struct mtd_info *mtd) -{ - struct mtd_concat *concat = CONCAT(mtd); - int i; - - for (i = 0; i < concat->num_subdev; i++) { - struct mtd_info *subdev = concat->subdev[i]; - mtd_sync(subdev); - } -} - -static int concat_suspend(struct mtd_info *mtd) -{ - struct mtd_concat *concat = CONCAT(mtd); - int i, rc = 0; - - for (i = 0; i < concat->num_subdev; i++) { - struct mtd_info *subdev = concat->subdev[i]; - if ((rc = mtd_suspend(subdev)) < 0) - return rc; - } - return rc; -} - -static void concat_resume(struct mtd_info *mtd) -{ - struct mtd_concat *concat = CONCAT(mtd); - int i; - - for (i = 0; i < concat->num_subdev; i++) { - struct mtd_info *subdev = concat->subdev[i]; - mtd_resume(subdev); - } -} - -static int concat_block_isbad(struct mtd_info *mtd, loff_t ofs) -{ - struct mtd_concat *concat = CONCAT(mtd); - int i, res = 0; - - if (!mtd_can_have_bb(concat->subdev[0])) - return res; - - for (i = 0; i < concat->num_subdev; i++) { - struct mtd_info *subdev = concat->subdev[i]; - - if (ofs >= subdev->size) { - ofs -= subdev->size; - continue; - } - - res = mtd_block_isbad(subdev, ofs); - break; - } - - return res; -} - -static int concat_block_markbad(struct mtd_info *mtd, loff_t ofs) -{ - struct mtd_concat *concat = CONCAT(mtd); - int i, err = -EINVAL; - - for (i = 0; i < concat->num_subdev; i++) { - struct mtd_info *subdev = concat->subdev[i]; - - if (ofs >= subdev->size) { - ofs -= subdev->size; - continue; - } - - err = mtd_block_markbad(subdev, ofs); - if (!err) - mtd->ecc_stats.badblocks++; - break; - } - - return err; -} - -/* - * try to support NOMMU mmaps on concatenated devices - * - we don't support subdev spanning as we can't guarantee it'll work - */ -static unsigned long concat_get_unmapped_area(struct mtd_info *mtd, - unsigned long len, - unsigned long offset, - unsigned long flags) -{ - struct mtd_concat *concat = CONCAT(mtd); - int i; - - for (i = 0; i < concat->num_subdev; i++) { - struct mtd_info *subdev = concat->subdev[i]; - - if (offset >= subdev->size) { - offset -= subdev->size; - continue; - } - - return mtd_get_unmapped_area(subdev, len, offset, flags); - } - - return (unsigned long) -ENOSYS; -} - -/* - * This function constructs a virtual MTD device by concatenating - * num_devs MTD devices. A pointer to the new device object is - * stored to *new_dev upon success. This function does _not_ - * register any devices: this is the caller's responsibility. - */ -struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to concatenate */ - int num_devs, /* number of subdevices */ - const char *name) -{ /* name for the new device */ - int i; - size_t size; - struct mtd_concat *concat; - uint32_t max_erasesize, curr_erasesize; - int num_erase_region; - int max_writebufsize = 0; - - printk(KERN_NOTICE "Concatenating MTD devices:\n"); - for (i = 0; i < num_devs; i++) - printk(KERN_NOTICE "(%d): \"%s\"\n", i, subdev[i]->name); - printk(KERN_NOTICE "into device \"%s\"\n", name); - - /* allocate the device structure */ - size = SIZEOF_STRUCT_MTD_CONCAT(num_devs); - concat = kzalloc(size, GFP_KERNEL); - if (!concat) { - printk - ("memory allocation error while creating concatenated device \"%s\"\n", - name); - return NULL; - } - concat->subdev = (struct mtd_info **) (concat + 1); - - /* - * Set up the new "super" device's MTD object structure, check for - * incompatibilities between the subdevices. - */ - concat->mtd.type = subdev[0]->type; - concat->mtd.flags = subdev[0]->flags; - concat->mtd.size = subdev[0]->size; - concat->mtd.erasesize = subdev[0]->erasesize; - concat->mtd.writesize = subdev[0]->writesize; - - for (i = 0; i < num_devs; i++) - if (max_writebufsize < subdev[i]->writebufsize) - max_writebufsize = subdev[i]->writebufsize; - concat->mtd.writebufsize = max_writebufsize; - - concat->mtd.subpage_sft = subdev[0]->subpage_sft; - concat->mtd.oobsize = subdev[0]->oobsize; - concat->mtd.oobavail = subdev[0]->oobavail; - if (subdev[0]->_writev) - concat->mtd._writev = concat_writev; - if (subdev[0]->_read_oob) - concat->mtd._read_oob = concat_read_oob; - if (subdev[0]->_write_oob) - concat->mtd._write_oob = concat_write_oob; - if (subdev[0]->_block_isbad) - concat->mtd._block_isbad = concat_block_isbad; - if (subdev[0]->_block_markbad) - concat->mtd._block_markbad = concat_block_markbad; - - concat->mtd.ecc_stats.badblocks = subdev[0]->ecc_stats.badblocks; - - concat->mtd.backing_dev_info = subdev[0]->backing_dev_info; - - concat->subdev[0] = subdev[0]; - - for (i = 1; i < num_devs; i++) { - if (concat->mtd.type != subdev[i]->type) { - kfree(concat); - printk("Incompatible device type on \"%s\"\n", - subdev[i]->name); - return NULL; - } - if (concat->mtd.flags != subdev[i]->flags) { - /* - * Expect all flags except MTD_WRITEABLE to be - * equal on all subdevices. - */ - if ((concat->mtd.flags ^ subdev[i]-> - flags) & ~MTD_WRITEABLE) { - kfree(concat); - printk("Incompatible device flags on \"%s\"\n", - subdev[i]->name); - return NULL; - } else - /* if writeable attribute differs, - make super device writeable */ - concat->mtd.flags |= - subdev[i]->flags & MTD_WRITEABLE; - } - - /* only permit direct mapping if the BDIs are all the same - * - copy-mapping is still permitted - */ - if (concat->mtd.backing_dev_info != - subdev[i]->backing_dev_info) - concat->mtd.backing_dev_info = - &default_backing_dev_info; - - concat->mtd.size += subdev[i]->size; - concat->mtd.ecc_stats.badblocks += - subdev[i]->ecc_stats.badblocks; - if (concat->mtd.writesize != subdev[i]->writesize || - concat->mtd.subpage_sft != subdev[i]->subpage_sft || - concat->mtd.oobsize != subdev[i]->oobsize || - !concat->mtd._read_oob != !subdev[i]->_read_oob || - !concat->mtd._write_oob != !subdev[i]->_write_oob) { - kfree(concat); - printk("Incompatible OOB or ECC data on \"%s\"\n", - subdev[i]->name); - return NULL; - } - concat->subdev[i] = subdev[i]; - - } - - concat->mtd.ecclayout = subdev[0]->ecclayout; - - concat->num_subdev = num_devs; - concat->mtd.name = name; - - concat->mtd._erase = concat_erase; - concat->mtd._read = concat_read; - concat->mtd._write = concat_write; - concat->mtd._sync = concat_sync; - concat->mtd._lock = concat_lock; - concat->mtd._unlock = concat_unlock; - concat->mtd._suspend = concat_suspend; - concat->mtd._resume = concat_resume; - concat->mtd._get_unmapped_area = concat_get_unmapped_area; - - /* - * Combine the erase block size info of the subdevices: - * - * first, walk the map of the new device and see how - * many changes in erase size we have - */ - max_erasesize = curr_erasesize = subdev[0]->erasesize; - num_erase_region = 1; - for (i = 0; i < num_devs; i++) { - if (subdev[i]->numeraseregions == 0) { - /* current subdevice has uniform erase size */ - if (subdev[i]->erasesize != curr_erasesize) { - /* if it differs from the last subdevice's erase size, count it */ - ++num_erase_region; - curr_erasesize = subdev[i]->erasesize; - if (curr_erasesize > max_erasesize) - max_erasesize = curr_erasesize; - } - } else { - /* current subdevice has variable erase size */ - int j; - for (j = 0; j < subdev[i]->numeraseregions; j++) { - - /* walk the list of erase regions, count any changes */ - if (subdev[i]->eraseregions[j].erasesize != - curr_erasesize) { - ++num_erase_region; - curr_erasesize = - subdev[i]->eraseregions[j]. - erasesize; - if (curr_erasesize > max_erasesize) - max_erasesize = curr_erasesize; - } - } - } - } - - if (num_erase_region == 1) { - /* - * All subdevices have the same uniform erase size. - * This is easy: - */ - concat->mtd.erasesize = curr_erasesize; - concat->mtd.numeraseregions = 0; - } else { - uint64_t tmp64; - - /* - * erase block size varies across the subdevices: allocate - * space to store the data describing the variable erase regions - */ - struct mtd_erase_region_info *erase_region_p; - uint64_t begin, position; - - concat->mtd.erasesize = max_erasesize; - concat->mtd.numeraseregions = num_erase_region; - concat->mtd.eraseregions = erase_region_p = - kmalloc(num_erase_region * - sizeof (struct mtd_erase_region_info), GFP_KERNEL); - if (!erase_region_p) { - kfree(concat); - printk - ("memory allocation error while creating erase region list" - " for device \"%s\"\n", name); - return NULL; - } - - /* - * walk the map of the new device once more and fill in - * in erase region info: - */ - curr_erasesize = subdev[0]->erasesize; - begin = position = 0; - for (i = 0; i < num_devs; i++) { - if (subdev[i]->numeraseregions == 0) { - /* current subdevice has uniform erase size */ - if (subdev[i]->erasesize != curr_erasesize) { - /* - * fill in an mtd_erase_region_info structure for the area - * we have walked so far: - */ - erase_region_p->offset = begin; - erase_region_p->erasesize = - curr_erasesize; - tmp64 = position - begin; - do_div(tmp64, curr_erasesize); - erase_region_p->numblocks = tmp64; - begin = position; - - curr_erasesize = subdev[i]->erasesize; - ++erase_region_p; - } - position += subdev[i]->size; - } else { - /* current subdevice has variable erase size */ - int j; - for (j = 0; j < subdev[i]->numeraseregions; j++) { - /* walk the list of erase regions, count any changes */ - if (subdev[i]->eraseregions[j]. - erasesize != curr_erasesize) { - erase_region_p->offset = begin; - erase_region_p->erasesize = - curr_erasesize; - tmp64 = position - begin; - do_div(tmp64, curr_erasesize); - erase_region_p->numblocks = tmp64; - begin = position; - - curr_erasesize = - subdev[i]->eraseregions[j]. - erasesize; - ++erase_region_p; - } - position += - subdev[i]->eraseregions[j]. - numblocks * (uint64_t)curr_erasesize; - } - } - } - /* Now write the final entry */ - erase_region_p->offset = begin; - erase_region_p->erasesize = curr_erasesize; - tmp64 = position - begin; - do_div(tmp64, curr_erasesize); - erase_region_p->numblocks = tmp64; - } - - return &concat->mtd; -} - -/* - * This function destroys an MTD object obtained from concat_mtd_devs() - */ - -void mtd_concat_destroy(struct mtd_info *mtd) -{ - struct mtd_concat *concat = CONCAT(mtd); - if (concat->mtd.numeraseregions) - kfree(concat->mtd.eraseregions); - kfree(concat); -} - -EXPORT_SYMBOL(mtd_concat_create); -EXPORT_SYMBOL(mtd_concat_destroy); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Robert Kaiser <rkaiser@sysgo.de>"); -MODULE_DESCRIPTION("Generic support for concatenating of MTD devices"); |