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drivers/mtd/mtdconcat.c
22.8 KB
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/* * MTD device concatenation layer * |
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* Copyright © 2002 Robert Kaiser <rkaiser@sysgo.de> * Copyright © 2002-2010 David Woodhouse <dwmw2@infradead.org> |
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* * NAND support by Christian Gan <cgan@iders.ca> * |
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* 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 * |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/sched.h> #include <linux/types.h> |
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#include <linux/backing-dev.h> |
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#include <linux/mtd/mtd.h> #include <linux/mtd/concat.h> |
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#include <asm/div64.h> |
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/* * 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)) |
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/* |
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* 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); |
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int ret = 0, err; |
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int i; |
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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; |
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err = mtd_read(subdev, from, size, &retsize, buf); |
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|
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/* Save information about bitflips! */ |
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if (unlikely(err)) { |
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if (mtd_is_eccerr(err)) { |
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mtd->ecc_stats.failed++; |
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ret = err; |
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} else if (mtd_is_bitflip(err)) { |
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mtd->ecc_stats.corrected++; /* Do not overwrite -EBADMSG !! */ if (!ret) ret = err; } else return err; |
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} |
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*retlen += retsize; len -= size; if (len == 0) |
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return ret; |
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buf += size; from = 0; } |
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return -EINVAL; |
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} 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; |
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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; |
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err = mtd_write(subdev, to, size, &retsize, buf); |
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if (err) break; *retlen += retsize; len -= size; if (len == 0) break; err = -EINVAL; buf += size; to = 0; } return err; } static int |
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concat_writev(struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t * retlen) |
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{ 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; |
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/* Calculate total length of data */ for (i = 0; i < count; i++) total_len += vecs[i].iov_len; |
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/* Check alignment */ |
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if (mtd->writesize > 1) { |
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uint64_t __to = to; |
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if (do_div(__to, mtd->writesize) || (total_len % mtd->writesize)) |
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return -EINVAL; |
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} |
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/* make a copy of vecs */ |
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vecs_copy = kmemdup(vecs, sizeof(struct kvec) * count, GFP_KERNEL); |
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if (!vecs_copy) return -ENOMEM; |
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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; } |
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size = min_t(uint64_t, total_len, subdev->size - to); |
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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; |
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err = mtd_writev(subdev, &vecs_copy[entry_low], entry_high - entry_low + 1, to, &retsize); |
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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; |
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if (total_len == 0) break; err = -EINVAL; to = 0; } kfree(vecs_copy); return err; } static int |
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concat_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) |
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{ struct mtd_concat *concat = CONCAT(mtd); |
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struct mtd_oob_ops devops = *ops; |
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int i, err, ret = 0; |
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|
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ops->retlen = ops->oobretlen = 0; |
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for (i = 0; i < concat->num_subdev; i++) { struct mtd_info *subdev = concat->subdev[i]; |
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if (from >= subdev->size) { |
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from -= subdev->size; continue; } |
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|
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/* partial read ? */ if (from + devops.len > subdev->size) devops.len = subdev->size - from; |
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err = mtd_read_oob(subdev, from, &devops); |
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ops->retlen += devops.retlen; |
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ops->oobretlen += devops.oobretlen; |
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/* Save information about bitflips! */ if (unlikely(err)) { |
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if (mtd_is_eccerr(err)) { |
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mtd->ecc_stats.failed++; ret = err; |
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} else if (mtd_is_bitflip(err)) { |
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mtd->ecc_stats.corrected++; /* Do not overwrite -EBADMSG !! */ if (!ret) ret = err; } else return err; } |
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|
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if (devops.datbuf) { devops.len = ops->len - ops->retlen; if (!devops.len) return ret; |
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devops.datbuf += devops.retlen; |
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} if (devops.oobbuf) { devops.ooblen = ops->ooblen - ops->oobretlen; if (!devops.ooblen) return ret; devops.oobbuf += ops->oobretlen; } |
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from = 0; } |
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return -EINVAL; |
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} static int |
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concat_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops) |
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{ struct mtd_concat *concat = CONCAT(mtd); |
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struct mtd_oob_ops devops = *ops; int i, err; |
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if (!(mtd->flags & MTD_WRITEABLE)) return -EROFS; |
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ops->retlen = ops->oobretlen = 0; |
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for (i = 0; i < concat->num_subdev; i++) { struct mtd_info *subdev = concat->subdev[i]; |
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if (to >= subdev->size) { |
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to -= subdev->size; continue; } |
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|
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/* partial write ? */ if (to + devops.len > subdev->size) devops.len = subdev->size - to; |
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err = mtd_write_oob(subdev, to, &devops); |
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ops->retlen += devops.retlen; ops->oobretlen += devops.oobretlen; |
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if (err) |
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return err; |
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if (devops.datbuf) { devops.len = ops->len - ops->retlen; if (!devops.len) return 0; |
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devops.datbuf += devops.retlen; |
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} if (devops.oobbuf) { devops.ooblen = ops->ooblen - ops->oobretlen; if (!devops.ooblen) return 0; devops.oobbuf += devops.oobretlen; } |
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to = 0; } |
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return -EINVAL; |
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} 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. */ |
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err = mtd_erase(mtd, erase); |
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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; |
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uint64_t length, offset = 0; |
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struct erase_info *erase; |
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/* * 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: */ |
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if (i < 0 || instr->addr & (erase_regions[i].erasesize - 1)) |
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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 */ |
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if (i < 0 || ((instr->addr + instr->len) & (erase_regions[i].erasesize - 1))) |
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return -EINVAL; } |
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/* 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 */ |
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BUG_ON(i >= concat->num_subdev); |
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/* 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; |
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length -= erase->len; if ((err = concat_dev_erase(subdev, erase))) { /* sanity check: should never happen since * block alignment has been checked above */ |
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BUG_ON(err == -EINVAL); |
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if (erase->fail_addr != MTD_FAIL_ADDR_UNKNOWN) |
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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; } |
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static int concat_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
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{ struct mtd_concat *concat = CONCAT(mtd); int i, err = -EINVAL; |
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for (i = 0; i < concat->num_subdev; i++) { struct mtd_info *subdev = concat->subdev[i]; |
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uint64_t size; |
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if (ofs >= subdev->size) { size = 0; ofs -= subdev->size; continue; } if (ofs + len > subdev->size) size = subdev->size - ofs; else size = len; |
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err = mtd_lock(subdev, ofs, size); if (err) break; |
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len -= size; if (len == 0) break; err = -EINVAL; ofs = 0; } return err; } |
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static int concat_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
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{ struct mtd_concat *concat = CONCAT(mtd); int i, err = 0; |
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for (i = 0; i < concat->num_subdev; i++) { struct mtd_info *subdev = concat->subdev[i]; |
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uint64_t size; |
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if (ofs >= subdev->size) { size = 0; ofs -= subdev->size; continue; } if (ofs + len > subdev->size) size = subdev->size - ofs; else size = len; |
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err = mtd_unlock(subdev, ofs, size); if (err) break; |
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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]; |
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mtd_sync(subdev); |
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} } 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]; |
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if ((rc = mtd_suspend(subdev)) < 0) |
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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]; |
ead995f8d mtd: introduce mt... |
574 |
mtd_resume(subdev); |
1da177e4c Linux-2.6.12-rc2 |
575 576 |
} } |
e8d32937d MTD: mtdconcat NA... |
577 578 579 580 |
static int concat_block_isbad(struct mtd_info *mtd, loff_t ofs) { struct mtd_concat *concat = CONCAT(mtd); int i, res = 0; |
8f461a730 mtd: introduce mt... |
581 |
if (!mtd_can_have_bb(concat->subdev[0])) |
e8d32937d MTD: mtdconcat NA... |
582 |
return res; |
e8d32937d MTD: mtdconcat NA... |
583 584 585 586 587 588 589 |
for (i = 0; i < concat->num_subdev; i++) { struct mtd_info *subdev = concat->subdev[i]; if (ofs >= subdev->size) { ofs -= subdev->size; continue; } |
7086c19d0 mtd: introduce mt... |
590 |
res = mtd_block_isbad(subdev, ofs); |
e8d32937d MTD: mtdconcat NA... |
591 592 593 594 595 596 597 598 599 600 |
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; |
e8d32937d MTD: mtdconcat NA... |
601 602 603 604 605 606 607 |
for (i = 0; i < concat->num_subdev; i++) { struct mtd_info *subdev = concat->subdev[i]; if (ofs >= subdev->size) { ofs -= subdev->size; continue; } |
5942ddbc5 mtd: introduce mt... |
608 |
err = mtd_block_markbad(subdev, ofs); |
f1a28c028 [MTD] NAND Expose... |
609 610 |
if (!err) mtd->ecc_stats.badblocks++; |
e8d32937d MTD: mtdconcat NA... |
611 612 613 614 615 |
break; } return err; } |
1da177e4c Linux-2.6.12-rc2 |
616 |
/* |
6e232cfce NOMMU: Add suppor... |
617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 |
* 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; } |
cd621274b mtd: do not use m... |
635 |
return mtd_get_unmapped_area(subdev, len, offset, flags); |
6e232cfce NOMMU: Add suppor... |
636 637 638 639 640 641 |
} return (unsigned long) -ENOSYS; } /* |
1da177e4c Linux-2.6.12-rc2 |
642 643 644 645 646 647 648 |
* 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 */ |
160bbab30 [MTD] struct devi... |
649 |
const char *name) |
1da177e4c Linux-2.6.12-rc2 |
650 651 652 653 |
{ /* name for the new device */ int i; size_t size; struct mtd_concat *concat; |
26cdb67c7 [MTD] Remove more... |
654 |
uint32_t max_erasesize, curr_erasesize; |
1da177e4c Linux-2.6.12-rc2 |
655 |
int num_erase_region; |
771df6194 mtd: adapt writeb... |
656 |
int max_writebufsize = 0; |
1da177e4c Linux-2.6.12-rc2 |
657 658 659 660 661 662 663 664 665 666 667 |
printk(KERN_NOTICE "Concatenating MTD devices: "); for (i = 0; i < num_devs; i++) printk(KERN_NOTICE "(%d): \"%s\" ", i, subdev[i]->name); printk(KERN_NOTICE "into device \"%s\" ", name); /* allocate the device structure */ size = SIZEOF_STRUCT_MTD_CONCAT(num_devs); |
95b93a0cd [MTD] replace kma... |
668 |
concat = kzalloc(size, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
669 670 671 672 673 674 675 |
if (!concat) { printk ("memory allocation error while creating concatenated device \"%s\" ", name); return NULL; } |
1da177e4c Linux-2.6.12-rc2 |
676 677 678 679 |
concat->subdev = (struct mtd_info **) (concat + 1); /* * Set up the new "super" device's MTD object structure, check for |
92394b5c2 mtd: spelling fixes |
680 |
* incompatibilities between the subdevices. |
1da177e4c Linux-2.6.12-rc2 |
681 682 683 684 685 |
*/ concat->mtd.type = subdev[0]->type; concat->mtd.flags = subdev[0]->flags; concat->mtd.size = subdev[0]->size; concat->mtd.erasesize = subdev[0]->erasesize; |
28318776a [MTD] Introduce w... |
686 |
concat->mtd.writesize = subdev[0]->writesize; |
771df6194 mtd: adapt writeb... |
687 688 689 690 691 |
for (i = 0; i < num_devs; i++) if (max_writebufsize < subdev[i]->writebufsize) max_writebufsize = subdev[i]->writebufsize; concat->mtd.writebufsize = max_writebufsize; |
a2e1b833d [MTD] fix mtdconc... |
692 |
concat->mtd.subpage_sft = subdev[0]->subpage_sft; |
1da177e4c Linux-2.6.12-rc2 |
693 |
concat->mtd.oobsize = subdev[0]->oobsize; |
1f92267c5 [MTD] [NAND] make... |
694 |
concat->mtd.oobavail = subdev[0]->oobavail; |
3c3c10bba mtd: add leading ... |
695 696 697 698 699 700 701 702 703 704 |
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; |
1da177e4c Linux-2.6.12-rc2 |
705 |
|
f1a28c028 [MTD] NAND Expose... |
706 |
concat->mtd.ecc_stats.badblocks = subdev[0]->ecc_stats.badblocks; |
1da177e4c Linux-2.6.12-rc2 |
707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 |
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\" ", 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\" ", subdev[i]->name); return NULL; } else /* if writeable attribute differs, make super device writeable */ concat->mtd.flags |= subdev[i]->flags & MTD_WRITEABLE; } |
6e232cfce NOMMU: Add suppor... |
735 |
|
1da177e4c Linux-2.6.12-rc2 |
736 |
concat->mtd.size += subdev[i]->size; |
f1a28c028 [MTD] NAND Expose... |
737 738 |
concat->mtd.ecc_stats.badblocks += subdev[i]->ecc_stats.badblocks; |
28318776a [MTD] Introduce w... |
739 |
if (concat->mtd.writesize != subdev[i]->writesize || |
29072b960 [MTD] NAND: add s... |
740 |
concat->mtd.subpage_sft != subdev[i]->subpage_sft || |
1da177e4c Linux-2.6.12-rc2 |
741 |
concat->mtd.oobsize != subdev[i]->oobsize || |
3c3c10bba mtd: add leading ... |
742 743 |
!concat->mtd._read_oob != !subdev[i]->_read_oob || !concat->mtd._write_oob != !subdev[i]->_write_oob) { |
1da177e4c Linux-2.6.12-rc2 |
744 745 746 747 748 749 750 751 752 |
kfree(concat); printk("Incompatible OOB or ECC data on \"%s\" ", subdev[i]->name); return NULL; } concat->subdev[i] = subdev[i]; } |
adbbc3bc8 mtd: create an mt... |
753 |
mtd_set_ooblayout(&concat->mtd, subdev[0]->ooblayout); |
e8d32937d MTD: mtdconcat NA... |
754 |
|
1da177e4c Linux-2.6.12-rc2 |
755 756 |
concat->num_subdev = num_devs; concat->mtd.name = name; |
3c3c10bba mtd: add leading ... |
757 758 759 760 761 762 763 764 765 |
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; |
1da177e4c Linux-2.6.12-rc2 |
766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 |
/* * 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 { |
69423d99f [MTD] update inte... |
812 |
uint64_t tmp64; |
1da177e4c Linux-2.6.12-rc2 |
813 814 815 816 817 |
/* * 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; |
69423d99f [MTD] update inte... |
818 |
uint64_t begin, position; |
1da177e4c Linux-2.6.12-rc2 |
819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 |
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\" ", 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; |
69423d99f [MTD] update inte... |
851 852 853 |
tmp64 = position - begin; do_div(tmp64, curr_erasesize); erase_region_p->numblocks = tmp64; |
1da177e4c Linux-2.6.12-rc2 |
854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 |
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; |
69423d99f [MTD] update inte... |
870 871 872 |
tmp64 = position - begin; do_div(tmp64, curr_erasesize); erase_region_p->numblocks = tmp64; |
1da177e4c Linux-2.6.12-rc2 |
873 874 875 876 877 878 879 880 881 |
begin = position; curr_erasesize = subdev[i]->eraseregions[j]. erasesize; ++erase_region_p; } position += subdev[i]->eraseregions[j]. |
69423d99f [MTD] update inte... |
882 |
numblocks * (uint64_t)curr_erasesize; |
1da177e4c Linux-2.6.12-rc2 |
883 884 885 886 887 888 |
} } } /* Now write the final entry */ erase_region_p->offset = begin; erase_region_p->erasesize = curr_erasesize; |
69423d99f [MTD] update inte... |
889 890 891 |
tmp64 = position - begin; do_div(tmp64, curr_erasesize); erase_region_p->numblocks = tmp64; |
1da177e4c Linux-2.6.12-rc2 |
892 893 894 895 |
} return &concat->mtd; } |
97894cda5 [MTD] core: Clean... |
896 |
/* |
1da177e4c Linux-2.6.12-rc2 |
897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 |
* 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"); |