diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/mtd/mtdpart.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/mtd/mtdpart.c | 770 |
1 files changed, 0 insertions, 770 deletions
diff --git a/ANDROID_3.4.5/drivers/mtd/mtdpart.c b/ANDROID_3.4.5/drivers/mtd/mtdpart.c deleted file mode 100644 index d3f3ce3e..00000000 --- a/ANDROID_3.4.5/drivers/mtd/mtdpart.c +++ /dev/null @@ -1,770 +0,0 @@ -/* - * Simple MTD partitioning layer - * - * Copyright © 2000 Nicolas Pitre <nico@fluxnic.net> - * Copyright © 2002 Thomas Gleixner <gleixner@linutronix.de> - * Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org> - * - * 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/module.h> -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/slab.h> -#include <linux/list.h> -#include <linux/kmod.h> -#include <linux/mtd/mtd.h> -#include <linux/mtd/partitions.h> -#include <linux/err.h> - -#include "mtdcore.h" - -/* Our partition linked list */ -static LIST_HEAD(mtd_partitions); -static DEFINE_MUTEX(mtd_partitions_mutex); - -/* Our partition node structure */ -struct mtd_part { - struct mtd_info mtd; - struct mtd_info *master; - uint64_t offset; - struct list_head list; -}; - -/* - * Given a pointer to the MTD object in the mtd_part structure, we can retrieve - * the pointer to that structure with this macro. - */ -#define PART(x) ((struct mtd_part *)(x)) - - -/* - * MTD methods which simply translate the effective address and pass through - * to the _real_ device. - */ - -static int part_read(struct mtd_info *mtd, loff_t from, size_t len, - size_t *retlen, u_char *buf) -{ - struct mtd_part *part = PART(mtd); - struct mtd_ecc_stats stats; - int res; - - stats = part->master->ecc_stats; - res = part->master->_read(part->master, from + part->offset, len, - retlen, buf); - if (unlikely(res)) { - if (mtd_is_bitflip(res)) - mtd->ecc_stats.corrected += part->master->ecc_stats.corrected - stats.corrected; - if (mtd_is_eccerr(res)) - mtd->ecc_stats.failed += part->master->ecc_stats.failed - stats.failed; - } - return res; -} - -static int part_point(struct mtd_info *mtd, loff_t from, size_t len, - size_t *retlen, void **virt, resource_size_t *phys) -{ - struct mtd_part *part = PART(mtd); - - return part->master->_point(part->master, from + part->offset, len, - retlen, virt, phys); -} - -static int part_unpoint(struct mtd_info *mtd, loff_t from, size_t len) -{ - struct mtd_part *part = PART(mtd); - - return part->master->_unpoint(part->master, from + part->offset, len); -} - -static unsigned long part_get_unmapped_area(struct mtd_info *mtd, - unsigned long len, - unsigned long offset, - unsigned long flags) -{ - struct mtd_part *part = PART(mtd); - - offset += part->offset; - return part->master->_get_unmapped_area(part->master, len, offset, - flags); -} - -static int part_read_oob(struct mtd_info *mtd, loff_t from, - struct mtd_oob_ops *ops) -{ - struct mtd_part *part = PART(mtd); - int res; - - if (from >= mtd->size) - return -EINVAL; - if (ops->datbuf && from + ops->len > mtd->size) - return -EINVAL; - - /* - * If OOB is also requested, make sure that we do not read past the end - * of this partition. - */ - if (ops->oobbuf) { - size_t len, pages; - - if (ops->mode == MTD_OPS_AUTO_OOB) - len = mtd->oobavail; - else - len = mtd->oobsize; - pages = mtd_div_by_ws(mtd->size, mtd); - pages -= mtd_div_by_ws(from, mtd); - if (ops->ooboffs + ops->ooblen > pages * len) - return -EINVAL; - } - - res = part->master->_read_oob(part->master, from + part->offset, ops); - if (unlikely(res)) { - if (mtd_is_bitflip(res)) - mtd->ecc_stats.corrected++; - if (mtd_is_eccerr(res)) - mtd->ecc_stats.failed++; - } - return res; -} - -static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from, - size_t len, size_t *retlen, u_char *buf) -{ - struct mtd_part *part = PART(mtd); - return part->master->_read_user_prot_reg(part->master, from, len, - retlen, buf); -} - -static int part_get_user_prot_info(struct mtd_info *mtd, - struct otp_info *buf, size_t len) -{ - struct mtd_part *part = PART(mtd); - return part->master->_get_user_prot_info(part->master, buf, len); -} - -static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, - size_t len, size_t *retlen, u_char *buf) -{ - struct mtd_part *part = PART(mtd); - return part->master->_read_fact_prot_reg(part->master, from, len, - retlen, buf); -} - -static int part_get_fact_prot_info(struct mtd_info *mtd, struct otp_info *buf, - size_t len) -{ - struct mtd_part *part = PART(mtd); - return part->master->_get_fact_prot_info(part->master, buf, len); -} -static int part_write(struct mtd_info *mtd, loff_t to, size_t len, - size_t *retlen, const u_char *buf) -{ - int ret; - struct mtd_part *part = PART(mtd); - ret = part->master->_write(part->master, to + part->offset, len, - retlen, buf); - return ret; -} - -static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len, - size_t *retlen, const u_char *buf) -{ - struct mtd_part *part = PART(mtd); - return part->master->_panic_write(part->master, to + part->offset, len, - retlen, buf); -} - -static int part_write_oob(struct mtd_info *mtd, loff_t to, - struct mtd_oob_ops *ops) -{ - struct mtd_part *part = PART(mtd); - - if (to >= mtd->size) - return -EINVAL; - if (ops->datbuf && to + ops->len > mtd->size) - return -EINVAL; - return part->master->_write_oob(part->master, to + part->offset, ops); -} - -static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from, - size_t len, size_t *retlen, u_char *buf) -{ - struct mtd_part *part = PART(mtd); - return part->master->_write_user_prot_reg(part->master, from, len, - retlen, buf); -} - -static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, - size_t len) -{ - struct mtd_part *part = PART(mtd); - return part->master->_lock_user_prot_reg(part->master, from, len); -} - -static int part_writev(struct mtd_info *mtd, const struct kvec *vecs, - unsigned long count, loff_t to, size_t *retlen) -{ - struct mtd_part *part = PART(mtd); - return part->master->_writev(part->master, vecs, count, - to + part->offset, retlen); -} - -static int part_erase(struct mtd_info *mtd, struct erase_info *instr) -{ - struct mtd_part *part = PART(mtd); - int ret; - - instr->addr += part->offset; - ret = part->master->_erase(part->master, instr); - if (ret) { - if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) - instr->fail_addr -= part->offset; - instr->addr -= part->offset; - } - return ret; -} - -void mtd_erase_callback(struct erase_info *instr) -{ - if (instr->mtd->_erase == part_erase) { - struct mtd_part *part = PART(instr->mtd); - - if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) - instr->fail_addr -= part->offset; - instr->addr -= part->offset; - } - if (instr->callback) - instr->callback(instr); -} -EXPORT_SYMBOL_GPL(mtd_erase_callback); - -static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) -{ - struct mtd_part *part = PART(mtd); - return part->master->_lock(part->master, ofs + part->offset, len); -} - -static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) -{ - struct mtd_part *part = PART(mtd); - return part->master->_unlock(part->master, ofs + part->offset, len); -} - -static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) -{ - struct mtd_part *part = PART(mtd); - return part->master->_is_locked(part->master, ofs + part->offset, len); -} - -static void part_sync(struct mtd_info *mtd) -{ - struct mtd_part *part = PART(mtd); - part->master->_sync(part->master); -} - -static int part_suspend(struct mtd_info *mtd) -{ - struct mtd_part *part = PART(mtd); - return part->master->_suspend(part->master); -} - -static void part_resume(struct mtd_info *mtd) -{ - struct mtd_part *part = PART(mtd); - part->master->_resume(part->master); -} - -static int part_block_isbad(struct mtd_info *mtd, loff_t ofs) -{ - struct mtd_part *part = PART(mtd); - ofs += part->offset; - return part->master->_block_isbad(part->master, ofs); -} - -static int part_block_markbad(struct mtd_info *mtd, loff_t ofs) -{ - struct mtd_part *part = PART(mtd); - int res; - - ofs += part->offset; - res = part->master->_block_markbad(part->master, ofs); - if (!res) - mtd->ecc_stats.badblocks++; - return res; -} - -static inline void free_partition(struct mtd_part *p) -{ - kfree(p->mtd.name); - kfree(p); -} - -/* - * This function unregisters and destroy all slave MTD objects which are - * attached to the given master MTD object. - */ - -int del_mtd_partitions(struct mtd_info *master) -{ - struct mtd_part *slave, *next; - int ret, err = 0; - - mutex_lock(&mtd_partitions_mutex); - list_for_each_entry_safe(slave, next, &mtd_partitions, list) - if (slave->master == master) { - ret = del_mtd_device(&slave->mtd); - if (ret < 0) { - err = ret; - continue; - } - list_del(&slave->list); - free_partition(slave); - } - mutex_unlock(&mtd_partitions_mutex); - - return err; -} - -static struct mtd_part *allocate_partition(struct mtd_info *master, - const struct mtd_partition *part, int partno, - uint64_t cur_offset) -{ - struct mtd_part *slave; - char *name; - - /* allocate the partition structure */ - slave = kzalloc(sizeof(*slave), GFP_KERNEL); - name = kstrdup(part->name, GFP_KERNEL); - if (!name || !slave) { - printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n", - master->name); - kfree(name); - kfree(slave); - return ERR_PTR(-ENOMEM); - } - - /* set up the MTD object for this partition */ - slave->mtd.type = master->type; - slave->mtd.flags = master->flags & ~part->mask_flags; - slave->mtd.size = part->size; - slave->mtd.writesize = master->writesize; - slave->mtd.writebufsize = master->writebufsize; - slave->mtd.oobsize = master->oobsize; - slave->mtd.oobavail = master->oobavail; - slave->mtd.subpage_sft = master->subpage_sft; - - slave->mtd.name = name; - slave->mtd.owner = master->owner; - slave->mtd.backing_dev_info = master->backing_dev_info; - - /* NOTE: we don't arrange MTDs as a tree; it'd be error-prone - * to have the same data be in two different partitions. - */ - slave->mtd.dev.parent = master->dev.parent; - - slave->mtd._read = part_read; - slave->mtd._write = part_write; - - if (master->_panic_write) - slave->mtd._panic_write = part_panic_write; - - if (master->_point && master->_unpoint) { - slave->mtd._point = part_point; - slave->mtd._unpoint = part_unpoint; - } - - if (master->_get_unmapped_area) - slave->mtd._get_unmapped_area = part_get_unmapped_area; - if (master->_read_oob) - slave->mtd._read_oob = part_read_oob; - if (master->_write_oob) - slave->mtd._write_oob = part_write_oob; - if (master->_read_user_prot_reg) - slave->mtd._read_user_prot_reg = part_read_user_prot_reg; - if (master->_read_fact_prot_reg) - slave->mtd._read_fact_prot_reg = part_read_fact_prot_reg; - if (master->_write_user_prot_reg) - slave->mtd._write_user_prot_reg = part_write_user_prot_reg; - if (master->_lock_user_prot_reg) - slave->mtd._lock_user_prot_reg = part_lock_user_prot_reg; - if (master->_get_user_prot_info) - slave->mtd._get_user_prot_info = part_get_user_prot_info; - if (master->_get_fact_prot_info) - slave->mtd._get_fact_prot_info = part_get_fact_prot_info; - if (master->_sync) - slave->mtd._sync = part_sync; - if (!partno && !master->dev.class && master->_suspend && - master->_resume) { - slave->mtd._suspend = part_suspend; - slave->mtd._resume = part_resume; - } - if (master->_writev) - slave->mtd._writev = part_writev; - if (master->_lock) - slave->mtd._lock = part_lock; - if (master->_unlock) - slave->mtd._unlock = part_unlock; - if (master->_is_locked) - slave->mtd._is_locked = part_is_locked; - if (master->_block_isbad) - slave->mtd._block_isbad = part_block_isbad; - if (master->_block_markbad) - slave->mtd._block_markbad = part_block_markbad; - slave->mtd._erase = part_erase; - slave->master = master; - slave->offset = part->offset; - - if (slave->offset == MTDPART_OFS_APPEND) - slave->offset = cur_offset; - if (slave->offset == MTDPART_OFS_NXTBLK) { - slave->offset = cur_offset; - if (mtd_mod_by_eb(cur_offset, master) != 0) { - /* Round up to next erasesize */ - slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize; - printk(KERN_NOTICE "Moving partition %d: " - "0x%012llx -> 0x%012llx\n", partno, - (unsigned long long)cur_offset, (unsigned long long)slave->offset); - } - } - if (slave->offset == MTDPART_OFS_RETAIN) { - slave->offset = cur_offset; - if (master->size - slave->offset >= slave->mtd.size) { - slave->mtd.size = master->size - slave->offset - - slave->mtd.size; - } else { - printk(KERN_ERR "mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n", - part->name, master->size - slave->offset, - slave->mtd.size); - /* register to preserve ordering */ - goto out_register; - } - } - if (slave->mtd.size == MTDPART_SIZ_FULL) - slave->mtd.size = master->size - slave->offset; - - printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset, - (unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name); - - /* let's do some sanity checks */ - if (slave->offset >= master->size) { - /* let's register it anyway to preserve ordering */ - slave->offset = 0; - slave->mtd.size = 0; - printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n", - part->name); - goto out_register; - } - if (slave->offset + slave->mtd.size > master->size) { - slave->mtd.size = master->size - slave->offset; - printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n", - part->name, master->name, (unsigned long long)slave->mtd.size); - } - if (master->numeraseregions > 1) { - /* Deal with variable erase size stuff */ - int i, max = master->numeraseregions; - u64 end = slave->offset + slave->mtd.size; - struct mtd_erase_region_info *regions = master->eraseregions; - - /* Find the first erase regions which is part of this - * partition. */ - for (i = 0; i < max && regions[i].offset <= slave->offset; i++) - ; - /* The loop searched for the region _behind_ the first one */ - if (i > 0) - i--; - - /* Pick biggest erasesize */ - for (; i < max && regions[i].offset < end; i++) { - if (slave->mtd.erasesize < regions[i].erasesize) { - slave->mtd.erasesize = regions[i].erasesize; - } - } - BUG_ON(slave->mtd.erasesize == 0); - } else { - /* Single erase size */ - slave->mtd.erasesize = master->erasesize; - } - - if ((slave->mtd.flags & MTD_WRITEABLE) && - mtd_mod_by_eb(slave->offset, &slave->mtd)) { - /* Doesn't start on a boundary of major erase size */ - /* FIXME: Let it be writable if it is on a boundary of - * _minor_ erase size though */ - slave->mtd.flags &= ~MTD_WRITEABLE; - printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n", - part->name); - } - if ((slave->mtd.flags & MTD_WRITEABLE) && - mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) { - slave->mtd.flags &= ~MTD_WRITEABLE; - printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n", - part->name); - } - - slave->mtd.ecclayout = master->ecclayout; - slave->mtd.ecc_strength = master->ecc_strength; - if (master->_block_isbad) { - uint64_t offs = 0; - - while (offs < slave->mtd.size) { - if (mtd_block_isbad(master, offs + slave->offset)) - slave->mtd.ecc_stats.badblocks++; - offs += slave->mtd.erasesize; - } - } - -out_register: - return slave; -} - -int mtd_add_partition(struct mtd_info *master, char *name, - long long offset, long long length) -{ - struct mtd_partition part; - struct mtd_part *p, *new; - uint64_t start, end; - int ret = 0; - - /* the direct offset is expected */ - if (offset == MTDPART_OFS_APPEND || - offset == MTDPART_OFS_NXTBLK) - return -EINVAL; - - if (length == MTDPART_SIZ_FULL) - length = master->size - offset; - - if (length <= 0) - return -EINVAL; - - part.name = name; - part.size = length; - part.offset = offset; - part.mask_flags = 0; - part.ecclayout = NULL; - - new = allocate_partition(master, &part, -1, offset); - if (IS_ERR(new)) - return PTR_ERR(new); - - start = offset; - end = offset + length; - - mutex_lock(&mtd_partitions_mutex); - list_for_each_entry(p, &mtd_partitions, list) - if (p->master == master) { - if ((start >= p->offset) && - (start < (p->offset + p->mtd.size))) - goto err_inv; - - if ((end >= p->offset) && - (end < (p->offset + p->mtd.size))) - goto err_inv; - } - - list_add(&new->list, &mtd_partitions); - mutex_unlock(&mtd_partitions_mutex); - - add_mtd_device(&new->mtd); - - return ret; -err_inv: - mutex_unlock(&mtd_partitions_mutex); - free_partition(new); - return -EINVAL; -} -EXPORT_SYMBOL_GPL(mtd_add_partition); - -int mtd_del_partition(struct mtd_info *master, int partno) -{ - struct mtd_part *slave, *next; - int ret = -EINVAL; - - mutex_lock(&mtd_partitions_mutex); - list_for_each_entry_safe(slave, next, &mtd_partitions, list) - if ((slave->master == master) && - (slave->mtd.index == partno)) { - ret = del_mtd_device(&slave->mtd); - if (ret < 0) - break; - - list_del(&slave->list); - free_partition(slave); - break; - } - mutex_unlock(&mtd_partitions_mutex); - - return ret; -} -EXPORT_SYMBOL_GPL(mtd_del_partition); - -/* - * This function, given a master MTD object and a partition table, creates - * and registers slave MTD objects which are bound to the master according to - * the partition definitions. - * - * We don't register the master, or expect the caller to have done so, - * for reasons of data integrity. - */ - -int add_mtd_partitions(struct mtd_info *master, - const struct mtd_partition *parts, - int nbparts) -{ - struct mtd_part *slave; - uint64_t cur_offset = 0; - int i; - - printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name); - - for (i = 0; i < nbparts; i++) { - slave = allocate_partition(master, parts + i, i, cur_offset); - if (IS_ERR(slave)) - return PTR_ERR(slave); - - mutex_lock(&mtd_partitions_mutex); - list_add(&slave->list, &mtd_partitions); - mutex_unlock(&mtd_partitions_mutex); - - add_mtd_device(&slave->mtd); - - cur_offset = slave->offset + slave->mtd.size; - } - - return 0; -} - -static DEFINE_SPINLOCK(part_parser_lock); -static LIST_HEAD(part_parsers); - -static struct mtd_part_parser *get_partition_parser(const char *name) -{ - struct mtd_part_parser *p, *ret = NULL; - - spin_lock(&part_parser_lock); - - list_for_each_entry(p, &part_parsers, list) - if (!strcmp(p->name, name) && try_module_get(p->owner)) { - ret = p; - break; - } - - spin_unlock(&part_parser_lock); - - return ret; -} - -#define put_partition_parser(p) do { module_put((p)->owner); } while (0) - -int register_mtd_parser(struct mtd_part_parser *p) -{ - spin_lock(&part_parser_lock); - list_add(&p->list, &part_parsers); - spin_unlock(&part_parser_lock); - - return 0; -} -EXPORT_SYMBOL_GPL(register_mtd_parser); - -int deregister_mtd_parser(struct mtd_part_parser *p) -{ - spin_lock(&part_parser_lock); - list_del(&p->list); - spin_unlock(&part_parser_lock); - return 0; -} -EXPORT_SYMBOL_GPL(deregister_mtd_parser); - -/* - * Do not forget to update 'parse_mtd_partitions()' kerneldoc comment if you - * are changing this array! - */ -static const char *default_mtd_part_types[] = { - "cmdlinepart", - "ofpart", - NULL -}; - -/** - * parse_mtd_partitions - parse MTD partitions - * @master: the master partition (describes whole MTD device) - * @types: names of partition parsers to try or %NULL - * @pparts: array of partitions found is returned here - * @data: MTD partition parser-specific data - * - * This function tries to find partition on MTD device @master. It uses MTD - * partition parsers, specified in @types. However, if @types is %NULL, then - * the default list of parsers is used. The default list contains only the - * "cmdlinepart" and "ofpart" parsers ATM. - * - * This function may return: - * o a negative error code in case of failure - * o zero if no partitions were found - * o a positive number of found partitions, in which case on exit @pparts will - * point to an array containing this number of &struct mtd_info objects. - */ -int parse_mtd_partitions(struct mtd_info *master, const char **types, - struct mtd_partition **pparts, - struct mtd_part_parser_data *data) -{ - struct mtd_part_parser *parser; - int ret = 0; - - if (!types) - types = default_mtd_part_types; - - for ( ; ret <= 0 && *types; types++) { - parser = get_partition_parser(*types); - if (!parser && !request_module("%s", *types)) - parser = get_partition_parser(*types); - if (!parser) - continue; - ret = (*parser->parse_fn)(master, pparts, data); - if (ret > 0) { - printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n", - ret, parser->name, master->name); - } - put_partition_parser(parser); - } - return ret; -} - -int mtd_is_partition(struct mtd_info *mtd) -{ - struct mtd_part *part; - int ispart = 0; - - mutex_lock(&mtd_partitions_mutex); - list_for_each_entry(part, &mtd_partitions, list) - if (&part->mtd == mtd) { - ispart = 1; - break; - } - mutex_unlock(&mtd_partitions_mutex); - - return ispart; -} -EXPORT_SYMBOL_GPL(mtd_is_partition); - -uint64_t mtd_get_device_size(struct mtd_info *mtd) -{ - if (!mtd_is_partition(mtd)) - return mtd->size; - - return PART(mtd)->master->size; -} -EXPORT_SYMBOL_GPL(mtd_get_device_size); |