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drivers/mtd/mtdcore.c
49.1 KB
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/* |
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* Core registration and callback routines for MTD * drivers and users. * |
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* Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> * Copyright © 2006 Red Hat UK Limited * * 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/module.h> #include <linux/kernel.h> |
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#include <linux/ptrace.h> |
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#include <linux/seq_file.h> |
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#include <linux/string.h> #include <linux/timer.h> #include <linux/major.h> #include <linux/fs.h> |
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#include <linux/err.h> |
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#include <linux/ioctl.h> #include <linux/init.h> |
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#include <linux/of.h> |
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#include <linux/proc_fs.h> |
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#include <linux/idr.h> |
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#include <linux/backing-dev.h> |
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#include <linux/gfp.h> |
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#include <linux/slab.h> |
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#include <linux/reboot.h> |
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#include <linux/leds.h> |
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#include <linux/mtd/mtd.h> |
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#include <linux/mtd/partitions.h> |
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|
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#include "mtdcore.h" |
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|
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struct backing_dev_info *mtd_bdi; |
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|
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#ifdef CONFIG_PM_SLEEP static int mtd_cls_suspend(struct device *dev) { struct mtd_info *mtd = dev_get_drvdata(dev); return mtd ? mtd_suspend(mtd) : 0; } static int mtd_cls_resume(struct device *dev) { struct mtd_info *mtd = dev_get_drvdata(dev); if (mtd) mtd_resume(mtd); return 0; } static SIMPLE_DEV_PM_OPS(mtd_cls_pm_ops, mtd_cls_suspend, mtd_cls_resume); #define MTD_CLS_PM_OPS (&mtd_cls_pm_ops) #else #define MTD_CLS_PM_OPS NULL #endif |
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static struct class mtd_class = { .name = "mtd", .owner = THIS_MODULE, |
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.pm = MTD_CLS_PM_OPS, |
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}; |
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|
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static DEFINE_IDR(mtd_idr); |
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/* These are exported solely for the purpose of mtd_blkdevs.c. You |
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should not use them for _anything_ else */ |
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DEFINE_MUTEX(mtd_table_mutex); |
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EXPORT_SYMBOL_GPL(mtd_table_mutex); |
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struct mtd_info *__mtd_next_device(int i) { return idr_get_next(&mtd_idr, &i); } EXPORT_SYMBOL_GPL(__mtd_next_device); |
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static LIST_HEAD(mtd_notifiers); |
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|
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#define MTD_DEVT(index) MKDEV(MTD_CHAR_MAJOR, (index)*2) |
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/* REVISIT once MTD uses the driver model better, whoever allocates * the mtd_info will probably want to use the release() hook... */ static void mtd_release(struct device *dev) { |
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struct mtd_info *mtd = dev_get_drvdata(dev); |
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dev_t index = MTD_DEVT(mtd->index); |
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|
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/* remove /dev/mtdXro node */ device_destroy(&mtd_class, index + 1); |
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} |
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static ssize_t mtd_type_show(struct device *dev, struct device_attribute *attr, char *buf) { |
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struct mtd_info *mtd = dev_get_drvdata(dev); |
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char *type; switch (mtd->type) { case MTD_ABSENT: type = "absent"; break; case MTD_RAM: type = "ram"; break; case MTD_ROM: type = "rom"; break; case MTD_NORFLASH: type = "nor"; break; case MTD_NANDFLASH: type = "nand"; break; case MTD_DATAFLASH: type = "dataflash"; break; case MTD_UBIVOLUME: type = "ubi"; break; |
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case MTD_MLCNANDFLASH: type = "mlc-nand"; break; |
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default: type = "unknown"; } return snprintf(buf, PAGE_SIZE, "%s ", type); } |
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static DEVICE_ATTR(type, S_IRUGO, mtd_type_show, NULL); static ssize_t mtd_flags_show(struct device *dev, struct device_attribute *attr, char *buf) { |
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struct mtd_info *mtd = dev_get_drvdata(dev); |
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return snprintf(buf, PAGE_SIZE, "0x%lx ", (unsigned long)mtd->flags); } static DEVICE_ATTR(flags, S_IRUGO, mtd_flags_show, NULL); static ssize_t mtd_size_show(struct device *dev, struct device_attribute *attr, char *buf) { |
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struct mtd_info *mtd = dev_get_drvdata(dev); |
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return snprintf(buf, PAGE_SIZE, "%llu ", (unsigned long long)mtd->size); } static DEVICE_ATTR(size, S_IRUGO, mtd_size_show, NULL); static ssize_t mtd_erasesize_show(struct device *dev, struct device_attribute *attr, char *buf) { |
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struct mtd_info *mtd = dev_get_drvdata(dev); |
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return snprintf(buf, PAGE_SIZE, "%lu ", (unsigned long)mtd->erasesize); } static DEVICE_ATTR(erasesize, S_IRUGO, mtd_erasesize_show, NULL); static ssize_t mtd_writesize_show(struct device *dev, struct device_attribute *attr, char *buf) { |
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struct mtd_info *mtd = dev_get_drvdata(dev); |
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return snprintf(buf, PAGE_SIZE, "%lu ", (unsigned long)mtd->writesize); } static DEVICE_ATTR(writesize, S_IRUGO, mtd_writesize_show, NULL); |
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static ssize_t mtd_subpagesize_show(struct device *dev, struct device_attribute *attr, char *buf) { |
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struct mtd_info *mtd = dev_get_drvdata(dev); |
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unsigned int subpagesize = mtd->writesize >> mtd->subpage_sft; return snprintf(buf, PAGE_SIZE, "%u ", subpagesize); } static DEVICE_ATTR(subpagesize, S_IRUGO, mtd_subpagesize_show, NULL); |
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static ssize_t mtd_oobsize_show(struct device *dev, struct device_attribute *attr, char *buf) { |
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struct mtd_info *mtd = dev_get_drvdata(dev); |
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return snprintf(buf, PAGE_SIZE, "%lu ", (unsigned long)mtd->oobsize); } static DEVICE_ATTR(oobsize, S_IRUGO, mtd_oobsize_show, NULL); static ssize_t mtd_numeraseregions_show(struct device *dev, struct device_attribute *attr, char *buf) { |
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struct mtd_info *mtd = dev_get_drvdata(dev); |
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return snprintf(buf, PAGE_SIZE, "%u ", mtd->numeraseregions); } static DEVICE_ATTR(numeraseregions, S_IRUGO, mtd_numeraseregions_show, NULL); static ssize_t mtd_name_show(struct device *dev, struct device_attribute *attr, char *buf) { |
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struct mtd_info *mtd = dev_get_drvdata(dev); |
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return snprintf(buf, PAGE_SIZE, "%s ", mtd->name); } static DEVICE_ATTR(name, S_IRUGO, mtd_name_show, NULL); |
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static ssize_t mtd_ecc_strength_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%u ", mtd->ecc_strength); } static DEVICE_ATTR(ecc_strength, S_IRUGO, mtd_ecc_strength_show, NULL); |
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static ssize_t mtd_bitflip_threshold_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%u ", mtd->bitflip_threshold); } static ssize_t mtd_bitflip_threshold_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct mtd_info *mtd = dev_get_drvdata(dev); unsigned int bitflip_threshold; int retval; retval = kstrtouint(buf, 0, &bitflip_threshold); if (retval) return retval; mtd->bitflip_threshold = bitflip_threshold; return count; } static DEVICE_ATTR(bitflip_threshold, S_IRUGO | S_IWUSR, mtd_bitflip_threshold_show, mtd_bitflip_threshold_store); |
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static ssize_t mtd_ecc_step_size_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mtd_info *mtd = dev_get_drvdata(dev); return snprintf(buf, PAGE_SIZE, "%u ", mtd->ecc_step_size); } static DEVICE_ATTR(ecc_step_size, S_IRUGO, mtd_ecc_step_size_show, NULL); |
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static ssize_t mtd_ecc_stats_corrected_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mtd_info *mtd = dev_get_drvdata(dev); struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats; return snprintf(buf, PAGE_SIZE, "%u ", ecc_stats->corrected); } static DEVICE_ATTR(corrected_bits, S_IRUGO, mtd_ecc_stats_corrected_show, NULL); static ssize_t mtd_ecc_stats_errors_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mtd_info *mtd = dev_get_drvdata(dev); struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats; return snprintf(buf, PAGE_SIZE, "%u ", ecc_stats->failed); } static DEVICE_ATTR(ecc_failures, S_IRUGO, mtd_ecc_stats_errors_show, NULL); static ssize_t mtd_badblocks_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mtd_info *mtd = dev_get_drvdata(dev); struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats; return snprintf(buf, PAGE_SIZE, "%u ", ecc_stats->badblocks); } static DEVICE_ATTR(bad_blocks, S_IRUGO, mtd_badblocks_show, NULL); static ssize_t mtd_bbtblocks_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mtd_info *mtd = dev_get_drvdata(dev); struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats; return snprintf(buf, PAGE_SIZE, "%u ", ecc_stats->bbtblocks); } static DEVICE_ATTR(bbt_blocks, S_IRUGO, mtd_bbtblocks_show, NULL); |
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static struct attribute *mtd_attrs[] = { |
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&dev_attr_type.attr, &dev_attr_flags.attr, &dev_attr_size.attr, &dev_attr_erasesize.attr, &dev_attr_writesize.attr, |
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&dev_attr_subpagesize.attr, |
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&dev_attr_oobsize.attr, &dev_attr_numeraseregions.attr, &dev_attr_name.attr, |
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&dev_attr_ecc_strength.attr, |
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&dev_attr_ecc_step_size.attr, |
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&dev_attr_corrected_bits.attr, &dev_attr_ecc_failures.attr, &dev_attr_bad_blocks.attr, &dev_attr_bbt_blocks.attr, |
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&dev_attr_bitflip_threshold.attr, |
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NULL, }; |
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ATTRIBUTE_GROUPS(mtd); |
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static struct device_type mtd_devtype = { .name = "mtd", .groups = mtd_groups, .release = mtd_release, }; |
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#ifndef CONFIG_MMU unsigned mtd_mmap_capabilities(struct mtd_info *mtd) { switch (mtd->type) { case MTD_RAM: return NOMMU_MAP_COPY | NOMMU_MAP_DIRECT | NOMMU_MAP_EXEC | NOMMU_MAP_READ | NOMMU_MAP_WRITE; case MTD_ROM: return NOMMU_MAP_COPY | NOMMU_MAP_DIRECT | NOMMU_MAP_EXEC | NOMMU_MAP_READ; default: return NOMMU_MAP_COPY; } } |
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EXPORT_SYMBOL_GPL(mtd_mmap_capabilities); |
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#endif |
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static int mtd_reboot_notifier(struct notifier_block *n, unsigned long state, void *cmd) { struct mtd_info *mtd; mtd = container_of(n, struct mtd_info, reboot_notifier); mtd->_reboot(mtd); return NOTIFY_DONE; } |
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/** |
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* mtd_wunit_to_pairing_info - get pairing information of a wunit * @mtd: pointer to new MTD device info structure * @wunit: write unit we are interested in * @info: returned pairing information * * Retrieve pairing information associated to the wunit. * This is mainly useful when dealing with MLC/TLC NANDs where pages can be * paired together, and where programming a page may influence the page it is * paired with. * The notion of page is replaced by the term wunit (write-unit) to stay * consistent with the ->writesize field. * * The @wunit argument can be extracted from an absolute offset using * mtd_offset_to_wunit(). @info is filled with the pairing information attached * to @wunit. * * From the pairing info the MTD user can find all the wunits paired with * @wunit using the following loop: * * for (i = 0; i < mtd_pairing_groups(mtd); i++) { * info.pair = i; * mtd_pairing_info_to_wunit(mtd, &info); * ... * } */ int mtd_wunit_to_pairing_info(struct mtd_info *mtd, int wunit, struct mtd_pairing_info *info) { int npairs = mtd_wunit_per_eb(mtd) / mtd_pairing_groups(mtd); if (wunit < 0 || wunit >= npairs) return -EINVAL; if (mtd->pairing && mtd->pairing->get_info) return mtd->pairing->get_info(mtd, wunit, info); info->group = 0; info->pair = wunit; return 0; } EXPORT_SYMBOL_GPL(mtd_wunit_to_pairing_info); /** * mtd_wunit_to_pairing_info - get wunit from pairing information * @mtd: pointer to new MTD device info structure * @info: pairing information struct * * Returns a positive number representing the wunit associated to the info * struct, or a negative error code. * * This is the reverse of mtd_wunit_to_pairing_info(), and can help one to * iterate over all wunits of a given pair (see mtd_wunit_to_pairing_info() * doc). * * It can also be used to only program the first page of each pair (i.e. * page attached to group 0), which allows one to use an MLC NAND in * software-emulated SLC mode: * * info.group = 0; * npairs = mtd_wunit_per_eb(mtd) / mtd_pairing_groups(mtd); * for (info.pair = 0; info.pair < npairs; info.pair++) { * wunit = mtd_pairing_info_to_wunit(mtd, &info); * mtd_write(mtd, mtd_wunit_to_offset(mtd, blkoffs, wunit), * mtd->writesize, &retlen, buf + (i * mtd->writesize)); * } */ int mtd_pairing_info_to_wunit(struct mtd_info *mtd, const struct mtd_pairing_info *info) { int ngroups = mtd_pairing_groups(mtd); int npairs = mtd_wunit_per_eb(mtd) / ngroups; if (!info || info->pair < 0 || info->pair >= npairs || info->group < 0 || info->group >= ngroups) return -EINVAL; if (mtd->pairing && mtd->pairing->get_wunit) return mtd->pairing->get_wunit(mtd, info); return info->pair; } EXPORT_SYMBOL_GPL(mtd_pairing_info_to_wunit); /** * mtd_pairing_groups - get the number of pairing groups * @mtd: pointer to new MTD device info structure * * Returns the number of pairing groups. * * This number is usually equal to the number of bits exposed by a single * cell, and can be used in conjunction with mtd_pairing_info_to_wunit() * to iterate over all pages of a given pair. */ int mtd_pairing_groups(struct mtd_info *mtd) { if (!mtd->pairing || !mtd->pairing->ngroups) return 1; return mtd->pairing->ngroups; } EXPORT_SYMBOL_GPL(mtd_pairing_groups); /** |
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* add_mtd_device - register an MTD device * @mtd: pointer to new MTD device info structure * * Add a device to the list of MTD devices present in the system, and * notify each currently active MTD 'user' of its arrival. Returns |
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* zero on success or non-zero on failure. |
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*/ int add_mtd_device(struct mtd_info *mtd) { |
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struct mtd_notifier *not; int i, error; |
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|
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/* * May occur, for instance, on buggy drivers which call * mtd_device_parse_register() multiple times on the same master MTD, * especially with CONFIG_MTD_PARTITIONED_MASTER=y. */ |
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if (WARN_ONCE(mtd->dev.type, "MTD already registered ")) |
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return -EEXIST; |
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BUG_ON(mtd->writesize == 0); |
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mutex_lock(&mtd_table_mutex); |
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|
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i = idr_alloc(&mtd_idr, mtd, 0, 0, GFP_KERNEL); |
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if (i < 0) { error = i; |
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goto fail_locked; |
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} |
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|
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mtd->index = i; mtd->usecount = 0; |
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/* default value if not set by driver */ if (mtd->bitflip_threshold == 0) mtd->bitflip_threshold = mtd->ecc_strength; |
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if (is_power_of_2(mtd->erasesize)) mtd->erasesize_shift = ffs(mtd->erasesize) - 1; else mtd->erasesize_shift = 0; if (is_power_of_2(mtd->writesize)) mtd->writesize_shift = ffs(mtd->writesize) - 1; else mtd->writesize_shift = 0; mtd->erasesize_mask = (1 << mtd->erasesize_shift) - 1; mtd->writesize_mask = (1 << mtd->writesize_shift) - 1; /* Some chips always power up locked. Unlock them now */ |
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if ((mtd->flags & MTD_WRITEABLE) && (mtd->flags & MTD_POWERUP_LOCK)) { error = mtd_unlock(mtd, 0, mtd->size); if (error && error != -EOPNOTSUPP) |
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printk(KERN_WARNING "%s: unlock failed, writes may not work ", mtd->name); |
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/* Ignore unlock failures? */ error = 0; |
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} /* Caller should have set dev.parent to match the |
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* physical device, if appropriate. |
b520e412f mtd: Replace stat... |
546 547 548 549 550 551 |
*/ mtd->dev.type = &mtd_devtype; mtd->dev.class = &mtd_class; mtd->dev.devt = MTD_DEVT(i); dev_set_name(&mtd->dev, "mtd%d", i); dev_set_drvdata(&mtd->dev, mtd); |
215a02fd3 mtd: grab a refer... |
552 |
of_node_get(mtd_get_of_node(mtd)); |
57dd990c5 mtd: propagate er... |
553 554 |
error = device_register(&mtd->dev); if (error) |
b520e412f mtd: Replace stat... |
555 |
goto fail_added; |
5e4721283 mtd: remove dead ... |
556 557 |
device_create(&mtd_class, mtd->dev.parent, MTD_DEVT(i) + 1, NULL, "mtd%dro", i); |
b520e412f mtd: Replace stat... |
558 |
|
289c05222 mtd: replace DEBU... |
559 560 |
pr_debug("mtd: Giving out device %d to %s ", i, mtd->name); |
b520e412f mtd: Replace stat... |
561 562 563 564 565 566 567 568 569 570 571 572 |
/* No need to get a refcount on the module containing the notifier, since we hold the mtd_table_mutex */ list_for_each_entry(not, &mtd_notifiers, list) not->add(mtd); mutex_unlock(&mtd_table_mutex); /* We _know_ we aren't being removed, because our caller is still holding us here. So none of this try_ nonsense, and no bitching about it either. :) */ __module_get(THIS_MODULE); return 0; |
97894cda5 [MTD] core: Clean... |
573 |
|
b520e412f mtd: Replace stat... |
574 |
fail_added: |
215a02fd3 mtd: grab a refer... |
575 |
of_node_put(mtd_get_of_node(mtd)); |
b520e412f mtd: Replace stat... |
576 577 |
idr_remove(&mtd_idr, i); fail_locked: |
48b192686 [PATCH] sem2mutex... |
578 |
mutex_unlock(&mtd_table_mutex); |
57dd990c5 mtd: propagate er... |
579 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
580 581 582 583 584 585 586 587 588 589 590 |
} /** * del_mtd_device - unregister an MTD device * @mtd: pointer to MTD device info structure * * Remove a device from the list of MTD devices present in the system, * and notify each currently active MTD 'user' of its departure. * Returns zero on success or 1 on failure, which currently will happen * if the requested device does not appear to be present in the list. */ |
eea72d5fd mtd: remove add_m... |
591 |
int del_mtd_device(struct mtd_info *mtd) |
1da177e4c Linux-2.6.12-rc2 |
592 593 |
{ int ret; |
75c0b84d4 mtd: call the rem... |
594 |
struct mtd_notifier *not; |
97894cda5 [MTD] core: Clean... |
595 |
|
48b192686 [PATCH] sem2mutex... |
596 |
mutex_lock(&mtd_table_mutex); |
1da177e4c Linux-2.6.12-rc2 |
597 |
|
b520e412f mtd: Replace stat... |
598 |
if (idr_find(&mtd_idr, mtd->index) != mtd) { |
1da177e4c Linux-2.6.12-rc2 |
599 |
ret = -ENODEV; |
75c0b84d4 mtd: call the rem... |
600 601 602 603 604 605 606 607 608 |
goto out_error; } /* No need to get a refcount on the module containing the notifier, since we hold the mtd_table_mutex */ list_for_each_entry(not, &mtd_notifiers, list) not->remove(mtd); if (mtd->usecount) { |
97894cda5 [MTD] core: Clean... |
609 610 |
printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d ", |
1da177e4c Linux-2.6.12-rc2 |
611 612 613 |
mtd->index, mtd->name, mtd->usecount); ret = -EBUSY; } else { |
694bb7fc1 [MTD] driver mode... |
614 |
device_unregister(&mtd->dev); |
b520e412f mtd: Replace stat... |
615 |
idr_remove(&mtd_idr, mtd->index); |
215a02fd3 mtd: grab a refer... |
616 |
of_node_put(mtd_get_of_node(mtd)); |
1da177e4c Linux-2.6.12-rc2 |
617 618 619 620 |
module_put(THIS_MODULE); ret = 0; } |
75c0b84d4 mtd: call the rem... |
621 |
out_error: |
48b192686 [PATCH] sem2mutex... |
622 |
mutex_unlock(&mtd_table_mutex); |
1da177e4c Linux-2.6.12-rc2 |
623 624 |
return ret; } |
727dc612c mtd: part: Create... |
625 |
static int mtd_add_device_partitions(struct mtd_info *mtd, |
07fd2f871 mtd: partitions: ... |
626 |
struct mtd_partitions *parts) |
727dc612c mtd: part: Create... |
627 |
{ |
07fd2f871 mtd: partitions: ... |
628 629 |
const struct mtd_partition *real_parts = parts->parts; int nbparts = parts->nr_parts; |
727dc612c mtd: part: Create... |
630 631 632 633 |
int ret; if (nbparts == 0 || IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER)) { ret = add_mtd_device(mtd); |
57dd990c5 mtd: propagate er... |
634 635 |
if (ret) return ret; |
727dc612c mtd: part: Create... |
636 637 638 639 640 641 642 643 644 645 646 |
} if (nbparts > 0) { ret = add_mtd_partitions(mtd, real_parts, nbparts); if (ret && IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER)) del_mtd_device(mtd); return ret; } return 0; } |
472b444ee mtd: fix cmdlinep... |
647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 |
/* * Set a few defaults based on the parent devices, if not provided by the * driver */ static void mtd_set_dev_defaults(struct mtd_info *mtd) { if (mtd->dev.parent) { if (!mtd->owner && mtd->dev.parent->driver) mtd->owner = mtd->dev.parent->driver->owner; if (!mtd->name) mtd->name = dev_name(mtd->dev.parent); } else { pr_debug("mtd device won't show a device symlink in sysfs "); } } |
727dc612c mtd: part: Create... |
663 |
|
1da177e4c Linux-2.6.12-rc2 |
664 |
/** |
1c4c215cb mtd: add new API ... |
665 666 667 668 669 |
* mtd_device_parse_register - parse partitions and register an MTD device. * * @mtd: the MTD device to register * @types: the list of MTD partition probes to try, see * 'parse_mtd_partitions()' for more information |
c79753301 mtd: abstract las... |
670 |
* @parser_data: MTD partition parser-specific data |
1c4c215cb mtd: add new API ... |
671 672 673 674 675 676 677 678 679 680 681 682 683 684 |
* @parts: fallback partition information to register, if parsing fails; * only valid if %nr_parts > %0 * @nr_parts: the number of partitions in parts, if zero then the full * MTD device is registered if no partition info is found * * This function aggregates MTD partitions parsing (done by * 'parse_mtd_partitions()') and MTD device and partitions registering. It * basically follows the most common pattern found in many MTD drivers: * * * It first tries to probe partitions on MTD device @mtd using parsers * specified in @types (if @types is %NULL, then the default list of parsers * is used, see 'parse_mtd_partitions()' for more information). If none are * found this functions tries to fallback to information specified in * @parts/@nr_parts. |
92394b5c2 mtd: spelling fixes |
685 |
* * If any partitioning info was found, this function registers the found |
727dc612c mtd: part: Create... |
686 687 |
* partitions. If the MTD_PARTITIONED_MASTER option is set, then the device * as a whole is registered first. |
1c4c215cb mtd: add new API ... |
688 689 690 691 692 |
* * If no partitions were found this function just registers the MTD device * @mtd and exits. * * Returns zero in case of success and a negative error code in case of failure. */ |
26a473462 mtd: add 'const' ... |
693 |
int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types, |
c79753301 mtd: abstract las... |
694 |
struct mtd_part_parser_data *parser_data, |
1c4c215cb mtd: add new API ... |
695 696 697 |
const struct mtd_partition *parts, int nr_parts) { |
07fd2f871 mtd: partitions: ... |
698 |
struct mtd_partitions parsed; |
727dc612c mtd: part: Create... |
699 |
int ret; |
1c4c215cb mtd: add new API ... |
700 |
|
472b444ee mtd: fix cmdlinep... |
701 |
mtd_set_dev_defaults(mtd); |
07fd2f871 mtd: partitions: ... |
702 703 704 705 706 707 708 709 710 711 712 |
memset(&parsed, 0, sizeof(parsed)); ret = parse_mtd_partitions(mtd, types, &parsed, parser_data); if ((ret < 0 || parsed.nr_parts == 0) && parts && nr_parts) { /* Fall back to driver-provided partitions */ parsed = (struct mtd_partitions){ .parts = parts, .nr_parts = nr_parts, }; } else if (ret < 0) { /* Didn't come up with parsed OR fallback partitions */ |
5a2415b07 mtd: mtdpart: Do ... |
713 714 715 716 |
pr_info("mtd: failed to find partitions; one or more parsers reports errors (%d) ", ret); /* Don't abort on errors; we can still use unpartitioned MTD */ |
07fd2f871 mtd: partitions: ... |
717 |
memset(&parsed, 0, sizeof(parsed)); |
3e00ed0e9 mtd: fixup corner... |
718 |
} |
1c4c215cb mtd: add new API ... |
719 |
|
07fd2f871 mtd: partitions: ... |
720 |
ret = mtd_add_device_partitions(mtd, &parsed); |
3e00ed0e9 mtd: fixup corner... |
721 722 |
if (ret) goto out; |
1c4c215cb mtd: add new API ... |
723 |
|
e1dd8641c mtd: avoid regist... |
724 725 726 727 728 729 730 731 |
/* * FIXME: some drivers unfortunately call this function more than once. * So we have to check if we've already assigned the reboot notifier. * * Generally, we can make multiple calls work for most cases, but it * does cause problems with parse_mtd_partitions() above (e.g., * cmdlineparts will register partitions more than once). */ |
f8479dd6a mtd: don't WARN a... |
732 733 734 |
WARN_ONCE(mtd->_reboot && mtd->reboot_notifier.notifier_call, "MTD already registered "); |
e1dd8641c mtd: avoid regist... |
735 |
if (mtd->_reboot && !mtd->reboot_notifier.notifier_call) { |
3efe41be2 mtd: implement co... |
736 737 738 |
mtd->reboot_notifier.notifier_call = mtd_reboot_notifier; register_reboot_notifier(&mtd->reboot_notifier); } |
3e00ed0e9 mtd: fixup corner... |
739 |
out: |
c42c2710d mtd: partitions: ... |
740 |
/* Cleanup any parsed partitions */ |
adc83bf88 mtd: partitions: ... |
741 |
mtd_part_parser_cleanup(&parsed); |
727dc612c mtd: part: Create... |
742 |
return ret; |
1c4c215cb mtd: add new API ... |
743 744 745 746 |
} EXPORT_SYMBOL_GPL(mtd_device_parse_register); /** |
f5671ab3f mtd: introduce mt... |
747 748 749 750 751 752 753 754 |
* mtd_device_unregister - unregister an existing MTD device. * * @master: the MTD device to unregister. This will unregister both the master * and any partitions if registered. */ int mtd_device_unregister(struct mtd_info *master) { int err; |
3efe41be2 mtd: implement co... |
755 756 |
if (master->_reboot) unregister_reboot_notifier(&master->reboot_notifier); |
f5671ab3f mtd: introduce mt... |
757 758 759 760 761 762 763 764 765 766 767 768 |
err = del_mtd_partitions(master); if (err) return err; if (!device_is_registered(&master->dev)) return 0; return del_mtd_device(master); } EXPORT_SYMBOL_GPL(mtd_device_unregister); /** |
1da177e4c Linux-2.6.12-rc2 |
769 770 771 772 773 774 775 |
* register_mtd_user - register a 'user' of MTD devices. * @new: pointer to notifier info structure * * Registers a pair of callbacks function to be called upon addition * or removal of MTD devices. Causes the 'add' callback to be immediately * invoked for each MTD device currently present in the system. */ |
1da177e4c Linux-2.6.12-rc2 |
776 777 |
void register_mtd_user (struct mtd_notifier *new) { |
f1332ba2f mtd: Introduce an... |
778 |
struct mtd_info *mtd; |
1da177e4c Linux-2.6.12-rc2 |
779 |
|
48b192686 [PATCH] sem2mutex... |
780 |
mutex_lock(&mtd_table_mutex); |
1da177e4c Linux-2.6.12-rc2 |
781 782 |
list_add(&new->list, &mtd_notifiers); |
d5ca51292 mtd:fix the bad f... |
783 |
__module_get(THIS_MODULE); |
97894cda5 [MTD] core: Clean... |
784 |
|
f1332ba2f mtd: Introduce an... |
785 786 |
mtd_for_each_device(mtd) new->add(mtd); |
1da177e4c Linux-2.6.12-rc2 |
787 |
|
48b192686 [PATCH] sem2mutex... |
788 |
mutex_unlock(&mtd_table_mutex); |
1da177e4c Linux-2.6.12-rc2 |
789 |
} |
33c87b4a2 mtd: mtdcore: exp... |
790 |
EXPORT_SYMBOL_GPL(register_mtd_user); |
1da177e4c Linux-2.6.12-rc2 |
791 792 |
/** |
494507958 [MTD] Fix unregis... |
793 794 |
* unregister_mtd_user - unregister a 'user' of MTD devices. * @old: pointer to notifier info structure |
1da177e4c Linux-2.6.12-rc2 |
795 796 797 798 799 800 |
* * Removes a callback function pair from the list of 'users' to be * notified upon addition or removal of MTD devices. Causes the * 'remove' callback to be immediately invoked for each MTD device * currently present in the system. */ |
1da177e4c Linux-2.6.12-rc2 |
801 802 |
int unregister_mtd_user (struct mtd_notifier *old) { |
f1332ba2f mtd: Introduce an... |
803 |
struct mtd_info *mtd; |
1da177e4c Linux-2.6.12-rc2 |
804 |
|
48b192686 [PATCH] sem2mutex... |
805 |
mutex_lock(&mtd_table_mutex); |
1da177e4c Linux-2.6.12-rc2 |
806 807 |
module_put(THIS_MODULE); |
f1332ba2f mtd: Introduce an... |
808 809 |
mtd_for_each_device(mtd) old->remove(mtd); |
97894cda5 [MTD] core: Clean... |
810 |
|
1da177e4c Linux-2.6.12-rc2 |
811 |
list_del(&old->list); |
48b192686 [PATCH] sem2mutex... |
812 |
mutex_unlock(&mtd_table_mutex); |
1da177e4c Linux-2.6.12-rc2 |
813 814 |
return 0; } |
33c87b4a2 mtd: mtdcore: exp... |
815 |
EXPORT_SYMBOL_GPL(unregister_mtd_user); |
1da177e4c Linux-2.6.12-rc2 |
816 817 818 819 820 821 822 823 824 |
/** * get_mtd_device - obtain a validated handle for an MTD device * @mtd: last known address of the required MTD device * @num: internal device number of the required MTD device * * Given a number and NULL address, return the num'th entry in the device * table, if any. Given an address and num == -1, search the device table * for a device with that address and return if it's still present. Given |
9c74034f8 [MTD] return erro... |
825 826 |
* both, return the num'th driver only if its address matches. Return * error code if not. |
1da177e4c Linux-2.6.12-rc2 |
827 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
828 829 |
struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num) { |
f1332ba2f mtd: Introduce an... |
830 831 |
struct mtd_info *ret = NULL, *other; int err = -ENODEV; |
1da177e4c Linux-2.6.12-rc2 |
832 |
|
48b192686 [PATCH] sem2mutex... |
833 |
mutex_lock(&mtd_table_mutex); |
1da177e4c Linux-2.6.12-rc2 |
834 835 |
if (num == -1) { |
f1332ba2f mtd: Introduce an... |
836 837 838 839 840 841 |
mtd_for_each_device(other) { if (other == mtd) { ret = mtd; break; } } |
b520e412f mtd: Replace stat... |
842 843 |
} else if (num >= 0) { ret = idr_find(&mtd_idr, num); |
1da177e4c Linux-2.6.12-rc2 |
844 845 846 |
if (mtd && mtd != ret) ret = NULL; } |
3bd456576 mtd: create unloc... |
847 848 849 |
if (!ret) { ret = ERR_PTR(err); goto out; |
9fe912cea [MTD] add get and... |
850 |
} |
1da177e4c Linux-2.6.12-rc2 |
851 |
|
3bd456576 mtd: create unloc... |
852 853 854 855 |
err = __get_mtd_device(ret); if (err) ret = ERR_PTR(err); out: |
9c74034f8 [MTD] return erro... |
856 857 |
mutex_unlock(&mtd_table_mutex); return ret; |
3bd456576 mtd: create unloc... |
858 |
} |
33c87b4a2 mtd: mtdcore: exp... |
859 |
EXPORT_SYMBOL_GPL(get_mtd_device); |
1da177e4c Linux-2.6.12-rc2 |
860 |
|
3bd456576 mtd: create unloc... |
861 862 863 864 865 866 867 |
int __get_mtd_device(struct mtd_info *mtd) { int err; if (!try_module_get(mtd->owner)) return -ENODEV; |
3c3c10bba mtd: add leading ... |
868 869 |
if (mtd->_get_device) { err = mtd->_get_device(mtd); |
3bd456576 mtd: create unloc... |
870 871 872 873 874 875 876 877 |
if (err) { module_put(mtd->owner); return err; } } mtd->usecount++; return 0; |
1da177e4c Linux-2.6.12-rc2 |
878 |
} |
33c87b4a2 mtd: mtdcore: exp... |
879 |
EXPORT_SYMBOL_GPL(__get_mtd_device); |
1da177e4c Linux-2.6.12-rc2 |
880 |
|
7799308f3 [MTD] add get_mtd... |
881 882 883 884 885 886 887 888 |
/** * get_mtd_device_nm - obtain a validated handle for an MTD device by * device name * @name: MTD device name to open * * This function returns MTD device description structure in case of * success and an error code in case of failure. */ |
7799308f3 [MTD] add get_mtd... |
889 890 |
struct mtd_info *get_mtd_device_nm(const char *name) { |
f1332ba2f mtd: Introduce an... |
891 892 |
int err = -ENODEV; struct mtd_info *mtd = NULL, *other; |
7799308f3 [MTD] add get_mtd... |
893 894 |
mutex_lock(&mtd_table_mutex); |
f1332ba2f mtd: Introduce an... |
895 896 897 |
mtd_for_each_device(other) { if (!strcmp(name, other->name)) { mtd = other; |
7799308f3 [MTD] add get_mtd... |
898 899 900 |
break; } } |
9fe912cea [MTD] add get and... |
901 |
if (!mtd) |
7799308f3 [MTD] add get_mtd... |
902 |
goto out_unlock; |
52534f2db mtd: simplify get... |
903 904 |
err = __get_mtd_device(mtd); if (err) |
7799308f3 [MTD] add get_mtd... |
905 |
goto out_unlock; |
9fe912cea [MTD] add get and... |
906 907 |
mutex_unlock(&mtd_table_mutex); return mtd; |
7799308f3 [MTD] add get_mtd... |
908 909 910 |
out_unlock: mutex_unlock(&mtd_table_mutex); |
9fe912cea [MTD] add get and... |
911 |
return ERR_PTR(err); |
7799308f3 [MTD] add get_mtd... |
912 |
} |
33c87b4a2 mtd: mtdcore: exp... |
913 |
EXPORT_SYMBOL_GPL(get_mtd_device_nm); |
7799308f3 [MTD] add get_mtd... |
914 |
|
1da177e4c Linux-2.6.12-rc2 |
915 916 |
void put_mtd_device(struct mtd_info *mtd) { |
48b192686 [PATCH] sem2mutex... |
917 |
mutex_lock(&mtd_table_mutex); |
3bd456576 mtd: create unloc... |
918 919 920 921 |
__put_mtd_device(mtd); mutex_unlock(&mtd_table_mutex); } |
33c87b4a2 mtd: mtdcore: exp... |
922 |
EXPORT_SYMBOL_GPL(put_mtd_device); |
3bd456576 mtd: create unloc... |
923 924 925 926 927 |
void __put_mtd_device(struct mtd_info *mtd) { --mtd->usecount; BUG_ON(mtd->usecount < 0); |
3c3c10bba mtd: add leading ... |
928 929 |
if (mtd->_put_device) mtd->_put_device(mtd); |
1da177e4c Linux-2.6.12-rc2 |
930 931 932 |
module_put(mtd->owner); } |
33c87b4a2 mtd: mtdcore: exp... |
933 |
EXPORT_SYMBOL_GPL(__put_mtd_device); |
1da177e4c Linux-2.6.12-rc2 |
934 |
|
52b020317 mtd: clean-up the... |
935 |
/* |
8273a0c91 mtd: add offset a... |
936 937 938 939 940 941 942 943 |
* Erase is an asynchronous operation. Device drivers are supposed * to call instr->callback() whenever the operation completes, even * if it completes with a failure. * Callers are supposed to pass a callback function and wait for it * to be called before writing to the block. */ int mtd_erase(struct mtd_info *mtd, struct erase_info *instr) { |
0c2b4e214 mtd: correct uppe... |
944 |
if (instr->addr >= mtd->size || instr->len > mtd->size - instr->addr) |
8273a0c91 mtd: add offset a... |
945 |
return -EINVAL; |
664addc24 mtd: remove R/O c... |
946 947 |
if (!(mtd->flags & MTD_WRITEABLE)) return -EROFS; |
3b27dac03 mtd: unify initia... |
948 |
instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN; |
bcb1d2387 mtd: move zero le... |
949 950 951 952 953 |
if (!instr->len) { instr->state = MTD_ERASE_DONE; mtd_erase_callback(instr); return 0; } |
fea728c09 mtd: Hook I/O act... |
954 |
ledtrig_mtd_activity(); |
8273a0c91 mtd: add offset a... |
955 956 957 958 959 960 961 962 963 964 965 |
return mtd->_erase(mtd, instr); } EXPORT_SYMBOL_GPL(mtd_erase); /* * This stuff for eXecute-In-Place. phys is optional and may be set to NULL. */ int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, void **virt, resource_size_t *phys) { *retlen = 0; |
0dd5235f5 mtd: harmonize mt... |
966 967 968 |
*virt = NULL; if (phys) *phys = 0; |
8273a0c91 mtd: add offset a... |
969 970 |
if (!mtd->_point) return -EOPNOTSUPP; |
0c2b4e214 mtd: correct uppe... |
971 |
if (from < 0 || from >= mtd->size || len > mtd->size - from) |
8273a0c91 mtd: add offset a... |
972 |
return -EINVAL; |
bcb1d2387 mtd: move zero le... |
973 974 |
if (!len) return 0; |
8273a0c91 mtd: add offset a... |
975 976 977 978 979 980 981 982 983 |
return mtd->_point(mtd, from, len, retlen, virt, phys); } EXPORT_SYMBOL_GPL(mtd_point); /* We probably shouldn't allow XIP if the unpoint isn't a NULL */ int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len) { if (!mtd->_point) return -EOPNOTSUPP; |
0c2b4e214 mtd: correct uppe... |
984 |
if (from < 0 || from >= mtd->size || len > mtd->size - from) |
8273a0c91 mtd: add offset a... |
985 |
return -EINVAL; |
bcb1d2387 mtd: move zero le... |
986 987 |
if (!len) return 0; |
8273a0c91 mtd: add offset a... |
988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 |
return mtd->_unpoint(mtd, from, len); } EXPORT_SYMBOL_GPL(mtd_unpoint); /* * Allow NOMMU mmap() to directly map the device (if not NULL) * - return the address to which the offset maps * - return -ENOSYS to indicate refusal to do the mapping */ unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len, unsigned long offset, unsigned long flags) { if (!mtd->_get_unmapped_area) return -EOPNOTSUPP; |
0c2b4e214 mtd: correct uppe... |
1002 |
if (offset >= mtd->size || len > mtd->size - offset) |
8273a0c91 mtd: add offset a... |
1003 1004 1005 1006 1007 1008 1009 1010 |
return -EINVAL; return mtd->_get_unmapped_area(mtd, len, offset, flags); } EXPORT_SYMBOL_GPL(mtd_get_unmapped_area); int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { |
edbc4540e mtd: driver _read... |
1011 |
int ret_code; |
834247ec7 mtd: remove retle... |
1012 |
*retlen = 0; |
0c2b4e214 mtd: correct uppe... |
1013 |
if (from < 0 || from >= mtd->size || len > mtd->size - from) |
8273a0c91 mtd: add offset a... |
1014 |
return -EINVAL; |
bcb1d2387 mtd: move zero le... |
1015 1016 |
if (!len) return 0; |
edbc4540e mtd: driver _read... |
1017 |
|
fea728c09 mtd: Hook I/O act... |
1018 |
ledtrig_mtd_activity(); |
edbc4540e mtd: driver _read... |
1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 |
/* * In the absence of an error, drivers return a non-negative integer * representing the maximum number of bitflips that were corrected on * any one ecc region (if applicable; zero otherwise). */ ret_code = mtd->_read(mtd, from, len, retlen, buf); if (unlikely(ret_code < 0)) return ret_code; if (mtd->ecc_strength == 0) return 0; /* device lacks ecc */ return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0; |
8273a0c91 mtd: add offset a... |
1030 1031 1032 1033 1034 1035 1036 |
} EXPORT_SYMBOL_GPL(mtd_read); int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf) { *retlen = 0; |
0c2b4e214 mtd: correct uppe... |
1037 |
if (to < 0 || to >= mtd->size || len > mtd->size - to) |
8273a0c91 mtd: add offset a... |
1038 |
return -EINVAL; |
664addc24 mtd: remove R/O c... |
1039 1040 |
if (!mtd->_write || !(mtd->flags & MTD_WRITEABLE)) return -EROFS; |
bcb1d2387 mtd: move zero le... |
1041 1042 |
if (!len) return 0; |
fea728c09 mtd: Hook I/O act... |
1043 |
ledtrig_mtd_activity(); |
8273a0c91 mtd: add offset a... |
1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 |
return mtd->_write(mtd, to, len, retlen, buf); } EXPORT_SYMBOL_GPL(mtd_write); /* * In blackbox flight recorder like scenarios we want to make successful writes * in interrupt context. panic_write() is only intended to be called when its * known the kernel is about to panic and we need the write to succeed. Since * the kernel is not going to be running for much longer, this function can * break locks and delay to ensure the write succeeds (but not sleep). */ int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf) { *retlen = 0; if (!mtd->_panic_write) return -EOPNOTSUPP; |
0c2b4e214 mtd: correct uppe... |
1061 |
if (to < 0 || to >= mtd->size || len > mtd->size - to) |
8273a0c91 mtd: add offset a... |
1062 |
return -EINVAL; |
664addc24 mtd: remove R/O c... |
1063 1064 |
if (!(mtd->flags & MTD_WRITEABLE)) return -EROFS; |
bcb1d2387 mtd: move zero le... |
1065 1066 |
if (!len) return 0; |
8273a0c91 mtd: add offset a... |
1067 1068 1069 |
return mtd->_panic_write(mtd, to, len, retlen, buf); } EXPORT_SYMBOL_GPL(mtd_panic_write); |
d2d48480d mtd: move mtd_rea... |
1070 1071 |
int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) { |
e47f68587 mtd: check for ma... |
1072 |
int ret_code; |
d2d48480d mtd: move mtd_rea... |
1073 1074 1075 |
ops->retlen = ops->oobretlen = 0; if (!mtd->_read_oob) return -EOPNOTSUPP; |
fea728c09 mtd: Hook I/O act... |
1076 1077 |
ledtrig_mtd_activity(); |
e47f68587 mtd: check for ma... |
1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 |
/* * In cases where ops->datbuf != NULL, mtd->_read_oob() has semantics * similar to mtd->_read(), returning a non-negative integer * representing max bitflips. In other cases, mtd->_read_oob() may * return -EUCLEAN. In all cases, perform similar logic to mtd_read(). */ ret_code = mtd->_read_oob(mtd, from, ops); if (unlikely(ret_code < 0)) return ret_code; if (mtd->ecc_strength == 0) return 0; /* device lacks ecc */ return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0; |
d2d48480d mtd: move mtd_rea... |
1090 1091 |
} EXPORT_SYMBOL_GPL(mtd_read_oob); |
0c034fe37 mtd: Uninline mtd... |
1092 1093 1094 1095 1096 1097 1098 1099 |
int mtd_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops) { ops->retlen = ops->oobretlen = 0; if (!mtd->_write_oob) return -EOPNOTSUPP; if (!(mtd->flags & MTD_WRITEABLE)) return -EROFS; |
fea728c09 mtd: Hook I/O act... |
1100 |
ledtrig_mtd_activity(); |
0c034fe37 mtd: Uninline mtd... |
1101 1102 1103 |
return mtd->_write_oob(mtd, to, ops); } EXPORT_SYMBOL_GPL(mtd_write_oob); |
75eb2cec2 mtd: add mtd_oobl... |
1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 |
/** * mtd_ooblayout_ecc - Get the OOB region definition of a specific ECC section * @mtd: MTD device structure * @section: ECC section. Depending on the layout you may have all the ECC * bytes stored in a single contiguous section, or one section * per ECC chunk (and sometime several sections for a single ECC * ECC chunk) * @oobecc: OOB region struct filled with the appropriate ECC position * information * |
7da0fffb3 mtd: fix typos in... |
1114 |
* This function returns ECC section information in the OOB area. If you want |
75eb2cec2 mtd: add mtd_oobl... |
1115 1116 1117 1118 1119 1120 1121 1122 |
* to get all the ECC bytes information, then you should call * mtd_ooblayout_ecc(mtd, section++, oobecc) until it returns -ERANGE. * * Returns zero on success, a negative error code otherwise. */ int mtd_ooblayout_ecc(struct mtd_info *mtd, int section, struct mtd_oob_region *oobecc) { |
75eb2cec2 mtd: add mtd_oobl... |
1123 1124 1125 1126 |
memset(oobecc, 0, sizeof(*oobecc)); if (!mtd || section < 0) return -EINVAL; |
adbbc3bc8 mtd: create an mt... |
1127 |
if (!mtd->ooblayout || !mtd->ooblayout->ecc) |
75eb2cec2 mtd: add mtd_oobl... |
1128 |
return -ENOTSUPP; |
adbbc3bc8 mtd: create an mt... |
1129 |
return mtd->ooblayout->ecc(mtd, section, oobecc); |
75eb2cec2 mtd: add mtd_oobl... |
1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 |
} EXPORT_SYMBOL_GPL(mtd_ooblayout_ecc); /** * mtd_ooblayout_free - Get the OOB region definition of a specific free * section * @mtd: MTD device structure * @section: Free section you are interested in. Depending on the layout * you may have all the free bytes stored in a single contiguous * section, or one section per ECC chunk plus an extra section * for the remaining bytes (or other funky layout). * @oobfree: OOB region struct filled with the appropriate free position * information * |
7da0fffb3 mtd: fix typos in... |
1144 |
* This function returns free bytes position in the OOB area. If you want |
75eb2cec2 mtd: add mtd_oobl... |
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 |
* to get all the free bytes information, then you should call * mtd_ooblayout_free(mtd, section++, oobfree) until it returns -ERANGE. * * Returns zero on success, a negative error code otherwise. */ int mtd_ooblayout_free(struct mtd_info *mtd, int section, struct mtd_oob_region *oobfree) { memset(oobfree, 0, sizeof(*oobfree)); if (!mtd || section < 0) return -EINVAL; |
adbbc3bc8 mtd: create an mt... |
1157 |
if (!mtd->ooblayout || !mtd->ooblayout->free) |
75eb2cec2 mtd: add mtd_oobl... |
1158 |
return -ENOTSUPP; |
adbbc3bc8 mtd: create an mt... |
1159 |
return mtd->ooblayout->free(mtd, section, oobfree); |
75eb2cec2 mtd: add mtd_oobl... |
1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 |
} EXPORT_SYMBOL_GPL(mtd_ooblayout_free); /** * mtd_ooblayout_find_region - Find the region attached to a specific byte * @mtd: mtd info structure * @byte: the byte we are searching for * @sectionp: pointer where the section id will be stored * @oobregion: used to retrieve the ECC position * @iter: iterator function. Should be either mtd_ooblayout_free or * mtd_ooblayout_ecc depending on the region type you're searching for * |
7da0fffb3 mtd: fix typos in... |
1172 |
* This function returns the section id and oobregion information of a |
75eb2cec2 mtd: add mtd_oobl... |
1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 |
* specific byte. For example, say you want to know where the 4th ECC byte is * stored, you'll use: * * mtd_ooblayout_find_region(mtd, 3, §ion, &oobregion, mtd_ooblayout_ecc); * * Returns zero on success, a negative error code otherwise. */ static int mtd_ooblayout_find_region(struct mtd_info *mtd, int byte, int *sectionp, struct mtd_oob_region *oobregion, int (*iter)(struct mtd_info *, int section, struct mtd_oob_region *oobregion)) { int pos = 0, ret, section = 0; memset(oobregion, 0, sizeof(*oobregion)); while (1) { ret = iter(mtd, section, oobregion); if (ret) return ret; if (pos + oobregion->length > byte) break; pos += oobregion->length; section++; } /* * Adjust region info to make it start at the beginning at the * 'start' ECC byte. */ oobregion->offset += byte - pos; oobregion->length -= byte - pos; *sectionp = section; return 0; } /** * mtd_ooblayout_find_eccregion - Find the ECC region attached to a specific * ECC byte * @mtd: mtd info structure * @eccbyte: the byte we are searching for * @sectionp: pointer where the section id will be stored * @oobregion: OOB region information * * Works like mtd_ooblayout_find_region() except it searches for a specific ECC * byte. * * Returns zero on success, a negative error code otherwise. */ int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte, int *section, struct mtd_oob_region *oobregion) { return mtd_ooblayout_find_region(mtd, eccbyte, section, oobregion, mtd_ooblayout_ecc); } EXPORT_SYMBOL_GPL(mtd_ooblayout_find_eccregion); /** * mtd_ooblayout_get_bytes - Extract OOB bytes from the oob buffer * @mtd: mtd info structure * @buf: destination buffer to store OOB bytes * @oobbuf: OOB buffer * @start: first byte to retrieve * @nbytes: number of bytes to retrieve * @iter: section iterator * * Extract bytes attached to a specific category (ECC or free) * from the OOB buffer and copy them into buf. * * Returns zero on success, a negative error code otherwise. */ static int mtd_ooblayout_get_bytes(struct mtd_info *mtd, u8 *buf, const u8 *oobbuf, int start, int nbytes, int (*iter)(struct mtd_info *, int section, struct mtd_oob_region *oobregion)) { |
8e8fd4d1e mtd: remove unnee... |
1255 1256 |
struct mtd_oob_region oobregion; int section, ret; |
75eb2cec2 mtd: add mtd_oobl... |
1257 1258 1259 1260 1261 1262 |
ret = mtd_ooblayout_find_region(mtd, start, §ion, &oobregion, iter); while (!ret) { int cnt; |
7c295ef96 mtd: use min_t() ... |
1263 |
cnt = min_t(int, nbytes, oobregion.length); |
75eb2cec2 mtd: add mtd_oobl... |
1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 |
memcpy(buf, oobbuf + oobregion.offset, cnt); buf += cnt; nbytes -= cnt; if (!nbytes) break; ret = iter(mtd, ++section, &oobregion); } return ret; } /** * mtd_ooblayout_set_bytes - put OOB bytes into the oob buffer * @mtd: mtd info structure * @buf: source buffer to get OOB bytes from * @oobbuf: OOB buffer * @start: first OOB byte to set * @nbytes: number of OOB bytes to set * @iter: section iterator * * Fill the OOB buffer with data provided in buf. The category (ECC or free) * is selected by passing the appropriate iterator. * * Returns zero on success, a negative error code otherwise. */ static int mtd_ooblayout_set_bytes(struct mtd_info *mtd, const u8 *buf, u8 *oobbuf, int start, int nbytes, int (*iter)(struct mtd_info *, int section, struct mtd_oob_region *oobregion)) { |
8e8fd4d1e mtd: remove unnee... |
1297 1298 |
struct mtd_oob_region oobregion; int section, ret; |
75eb2cec2 mtd: add mtd_oobl... |
1299 1300 1301 1302 1303 1304 |
ret = mtd_ooblayout_find_region(mtd, start, §ion, &oobregion, iter); while (!ret) { int cnt; |
7c295ef96 mtd: use min_t() ... |
1305 |
cnt = min_t(int, nbytes, oobregion.length); |
75eb2cec2 mtd: add mtd_oobl... |
1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 |
memcpy(oobbuf + oobregion.offset, buf, cnt); buf += cnt; nbytes -= cnt; if (!nbytes) break; ret = iter(mtd, ++section, &oobregion); } return ret; } /** * mtd_ooblayout_count_bytes - count the number of bytes in a OOB category * @mtd: mtd info structure * @iter: category iterator * * Count the number of bytes in a given category. * * Returns a positive value on success, a negative error code otherwise. */ static int mtd_ooblayout_count_bytes(struct mtd_info *mtd, int (*iter)(struct mtd_info *, int section, struct mtd_oob_region *oobregion)) { |
4d6aecfb7 mtd: remove unnee... |
1333 |
struct mtd_oob_region oobregion; |
75eb2cec2 mtd: add mtd_oobl... |
1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 |
int section = 0, ret, nbytes = 0; while (1) { ret = iter(mtd, section++, &oobregion); if (ret) { if (ret == -ERANGE) ret = nbytes; break; } nbytes += oobregion.length; } return ret; } /** * mtd_ooblayout_get_eccbytes - extract ECC bytes from the oob buffer * @mtd: mtd info structure * @eccbuf: destination buffer to store ECC bytes * @oobbuf: OOB buffer * @start: first ECC byte to retrieve * @nbytes: number of ECC bytes to retrieve * * Works like mtd_ooblayout_get_bytes(), except it acts on ECC bytes. * * Returns zero on success, a negative error code otherwise. */ int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf, const u8 *oobbuf, int start, int nbytes) { return mtd_ooblayout_get_bytes(mtd, eccbuf, oobbuf, start, nbytes, mtd_ooblayout_ecc); } EXPORT_SYMBOL_GPL(mtd_ooblayout_get_eccbytes); /** * mtd_ooblayout_set_eccbytes - set ECC bytes into the oob buffer * @mtd: mtd info structure * @eccbuf: source buffer to get ECC bytes from * @oobbuf: OOB buffer * @start: first ECC byte to set * @nbytes: number of ECC bytes to set * * Works like mtd_ooblayout_set_bytes(), except it acts on ECC bytes. * * Returns zero on success, a negative error code otherwise. */ int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf, u8 *oobbuf, int start, int nbytes) { return mtd_ooblayout_set_bytes(mtd, eccbuf, oobbuf, start, nbytes, mtd_ooblayout_ecc); } EXPORT_SYMBOL_GPL(mtd_ooblayout_set_eccbytes); /** * mtd_ooblayout_get_databytes - extract data bytes from the oob buffer * @mtd: mtd info structure * @databuf: destination buffer to store ECC bytes * @oobbuf: OOB buffer * @start: first ECC byte to retrieve * @nbytes: number of ECC bytes to retrieve * * Works like mtd_ooblayout_get_bytes(), except it acts on free bytes. * * Returns zero on success, a negative error code otherwise. */ int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf, const u8 *oobbuf, int start, int nbytes) { return mtd_ooblayout_get_bytes(mtd, databuf, oobbuf, start, nbytes, mtd_ooblayout_free); } EXPORT_SYMBOL_GPL(mtd_ooblayout_get_databytes); /** * mtd_ooblayout_get_eccbytes - set data bytes into the oob buffer * @mtd: mtd info structure * @eccbuf: source buffer to get data bytes from * @oobbuf: OOB buffer * @start: first ECC byte to set * @nbytes: number of ECC bytes to set * * Works like mtd_ooblayout_get_bytes(), except it acts on free bytes. * * Returns zero on success, a negative error code otherwise. */ int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf, u8 *oobbuf, int start, int nbytes) { return mtd_ooblayout_set_bytes(mtd, databuf, oobbuf, start, nbytes, mtd_ooblayout_free); } EXPORT_SYMBOL_GPL(mtd_ooblayout_set_databytes); /** * mtd_ooblayout_count_freebytes - count the number of free bytes in OOB * @mtd: mtd info structure * * Works like mtd_ooblayout_count_bytes(), except it count free bytes. * * Returns zero on success, a negative error code otherwise. */ int mtd_ooblayout_count_freebytes(struct mtd_info *mtd) { return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_free); } EXPORT_SYMBOL_GPL(mtd_ooblayout_count_freebytes); /** * mtd_ooblayout_count_freebytes - count the number of ECC bytes in OOB * @mtd: mtd info structure * * Works like mtd_ooblayout_count_bytes(), except it count ECC bytes. * * Returns zero on success, a negative error code otherwise. */ int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd) { return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_ecc); } EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes); |
de3cac935 mtd: check for ze... |
1457 1458 1459 1460 1461 |
/* * Method to access the protection register area, present in some flash * devices. The user data is one time programmable but the factory data is read * only. */ |
4b78fc42f mtd: Add a retlen... |
1462 1463 |
int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen, struct otp_info *buf) |
de3cac935 mtd: check for ze... |
1464 1465 1466 1467 1468 |
{ if (!mtd->_get_fact_prot_info) return -EOPNOTSUPP; if (!len) return 0; |
4b78fc42f mtd: Add a retlen... |
1469 |
return mtd->_get_fact_prot_info(mtd, len, retlen, buf); |
de3cac935 mtd: check for ze... |
1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 |
} EXPORT_SYMBOL_GPL(mtd_get_fact_prot_info); int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { *retlen = 0; if (!mtd->_read_fact_prot_reg) return -EOPNOTSUPP; if (!len) return 0; return mtd->_read_fact_prot_reg(mtd, from, len, retlen, buf); } EXPORT_SYMBOL_GPL(mtd_read_fact_prot_reg); |
4b78fc42f mtd: Add a retlen... |
1484 1485 |
int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen, struct otp_info *buf) |
de3cac935 mtd: check for ze... |
1486 1487 1488 1489 1490 |
{ if (!mtd->_get_user_prot_info) return -EOPNOTSUPP; if (!len) return 0; |
4b78fc42f mtd: Add a retlen... |
1491 |
return mtd->_get_user_prot_info(mtd, len, retlen, buf); |
de3cac935 mtd: check for ze... |
1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 |
} EXPORT_SYMBOL_GPL(mtd_get_user_prot_info); int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { *retlen = 0; if (!mtd->_read_user_prot_reg) return -EOPNOTSUPP; if (!len) return 0; return mtd->_read_user_prot_reg(mtd, from, len, retlen, buf); } EXPORT_SYMBOL_GPL(mtd_read_user_prot_reg); int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, u_char *buf) { |
9a78bc83b mtd: Fix the beha... |
1510 |
int ret; |
de3cac935 mtd: check for ze... |
1511 1512 1513 1514 1515 |
*retlen = 0; if (!mtd->_write_user_prot_reg) return -EOPNOTSUPP; if (!len) return 0; |
9a78bc83b mtd: Fix the beha... |
1516 1517 1518 1519 1520 1521 1522 1523 1524 |
ret = mtd->_write_user_prot_reg(mtd, to, len, retlen, buf); if (ret) return ret; /* * If no data could be written at all, we are out of memory and * must return -ENOSPC. */ return (*retlen) ? 0 : -ENOSPC; |
de3cac935 mtd: check for ze... |
1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 |
} EXPORT_SYMBOL_GPL(mtd_write_user_prot_reg); int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len) { if (!mtd->_lock_user_prot_reg) return -EOPNOTSUPP; if (!len) return 0; return mtd->_lock_user_prot_reg(mtd, from, len); } EXPORT_SYMBOL_GPL(mtd_lock_user_prot_reg); |
8273a0c91 mtd: add offset a... |
1537 1538 1539 1540 1541 |
/* Chip-supported device locking */ int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) { if (!mtd->_lock) return -EOPNOTSUPP; |
0c2b4e214 mtd: correct uppe... |
1542 |
if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs) |
8273a0c91 mtd: add offset a... |
1543 |
return -EINVAL; |
bcb1d2387 mtd: move zero le... |
1544 1545 |
if (!len) return 0; |
8273a0c91 mtd: add offset a... |
1546 1547 1548 1549 1550 1551 1552 1553 |
return mtd->_lock(mtd, ofs, len); } EXPORT_SYMBOL_GPL(mtd_lock); int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) { if (!mtd->_unlock) return -EOPNOTSUPP; |
0c2b4e214 mtd: correct uppe... |
1554 |
if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs) |
8273a0c91 mtd: add offset a... |
1555 |
return -EINVAL; |
bcb1d2387 mtd: move zero le... |
1556 1557 |
if (!len) return 0; |
8273a0c91 mtd: add offset a... |
1558 1559 1560 1561 1562 1563 1564 1565 |
return mtd->_unlock(mtd, ofs, len); } EXPORT_SYMBOL_GPL(mtd_unlock); int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) { if (!mtd->_is_locked) return -EOPNOTSUPP; |
0c2b4e214 mtd: correct uppe... |
1566 |
if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs) |
8273a0c91 mtd: add offset a... |
1567 |
return -EINVAL; |
bcb1d2387 mtd: move zero le... |
1568 1569 |
if (!len) return 0; |
8273a0c91 mtd: add offset a... |
1570 1571 1572 |
return mtd->_is_locked(mtd, ofs, len); } EXPORT_SYMBOL_GPL(mtd_is_locked); |
8471bb73b mtd: Introduce mt... |
1573 |
int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs) |
8273a0c91 mtd: add offset a... |
1574 |
{ |
0c2b4e214 mtd: correct uppe... |
1575 |
if (ofs < 0 || ofs >= mtd->size) |
8471bb73b mtd: Introduce mt... |
1576 1577 |
return -EINVAL; if (!mtd->_block_isreserved) |
8273a0c91 mtd: add offset a... |
1578 |
return 0; |
8471bb73b mtd: Introduce mt... |
1579 1580 1581 1582 1583 1584 |
return mtd->_block_isreserved(mtd, ofs); } EXPORT_SYMBOL_GPL(mtd_block_isreserved); int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs) { |
0c2b4e214 mtd: correct uppe... |
1585 |
if (ofs < 0 || ofs >= mtd->size) |
8273a0c91 mtd: add offset a... |
1586 |
return -EINVAL; |
8471bb73b mtd: Introduce mt... |
1587 1588 |
if (!mtd->_block_isbad) return 0; |
8273a0c91 mtd: add offset a... |
1589 1590 1591 1592 1593 1594 1595 1596 |
return mtd->_block_isbad(mtd, ofs); } EXPORT_SYMBOL_GPL(mtd_block_isbad); int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs) { if (!mtd->_block_markbad) return -EOPNOTSUPP; |
0c2b4e214 mtd: correct uppe... |
1597 |
if (ofs < 0 || ofs >= mtd->size) |
8273a0c91 mtd: add offset a... |
1598 |
return -EINVAL; |
664addc24 mtd: remove R/O c... |
1599 1600 |
if (!(mtd->flags & MTD_WRITEABLE)) return -EROFS; |
8273a0c91 mtd: add offset a... |
1601 1602 1603 1604 1605 |
return mtd->_block_markbad(mtd, ofs); } EXPORT_SYMBOL_GPL(mtd_block_markbad); /* |
52b020317 mtd: clean-up the... |
1606 1607 1608 1609 1610 1611 1612 1613 1614 |
* default_mtd_writev - the default writev method * @mtd: mtd device description object pointer * @vecs: the vectors to write * @count: count of vectors in @vecs * @to: the MTD device offset to write to * @retlen: on exit contains the count of bytes written to the MTD device. * * This function returns zero in case of success and a negative error code in * case of failure. |
1da177e4c Linux-2.6.12-rc2 |
1615 |
*/ |
1dbebd325 mtd: harmonize mt... |
1616 1617 |
static int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen) |
1da177e4c Linux-2.6.12-rc2 |
1618 1619 1620 1621 |
{ unsigned long i; size_t totlen = 0, thislen; int ret = 0; |
52b020317 mtd: clean-up the... |
1622 1623 1624 1625 1626 1627 1628 1629 1630 |
for (i = 0; i < count; i++) { if (!vecs[i].iov_len) continue; ret = mtd_write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base); totlen += thislen; if (ret || thislen != vecs[i].iov_len) break; to += vecs[i].iov_len; |
1da177e4c Linux-2.6.12-rc2 |
1631 |
} |
52b020317 mtd: clean-up the... |
1632 |
*retlen = totlen; |
1da177e4c Linux-2.6.12-rc2 |
1633 1634 |
return ret; } |
1dbebd325 mtd: harmonize mt... |
1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 |
/* * mtd_writev - the vector-based MTD write method * @mtd: mtd device description object pointer * @vecs: the vectors to write * @count: count of vectors in @vecs * @to: the MTD device offset to write to * @retlen: on exit contains the count of bytes written to the MTD device. * * This function returns zero in case of success and a negative error code in * case of failure. */ int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen) { *retlen = 0; |
664addc24 mtd: remove R/O c... |
1651 1652 |
if (!(mtd->flags & MTD_WRITEABLE)) return -EROFS; |
3c3c10bba mtd: add leading ... |
1653 |
if (!mtd->_writev) |
1dbebd325 mtd: harmonize mt... |
1654 |
return default_mtd_writev(mtd, vecs, count, to, retlen); |
3c3c10bba mtd: add leading ... |
1655 |
return mtd->_writev(mtd, vecs, count, to, retlen); |
1dbebd325 mtd: harmonize mt... |
1656 1657 |
} EXPORT_SYMBOL_GPL(mtd_writev); |
1da177e4c Linux-2.6.12-rc2 |
1658 |
|
33b53716b mtd: create funct... |
1659 1660 |
/** * mtd_kmalloc_up_to - allocate a contiguous buffer up to the specified size |
52b020317 mtd: clean-up the... |
1661 1662 |
* @mtd: mtd device description object pointer * @size: a pointer to the ideal or maximum size of the allocation, points |
33b53716b mtd: create funct... |
1663 1664 1665 1666 1667 1668 1669 |
* to the actual allocation size on success. * * This routine attempts to allocate a contiguous kernel buffer up to * the specified size, backing off the size of the request exponentially * until the request succeeds or until the allocation size falls below * the system page size. This attempts to make sure it does not adversely * impact system performance, so when allocating more than one page, we |
caf491916 Revert "revert "R... |
1670 1671 |
* ask the memory allocator to avoid re-trying, swapping, writing back * or performing I/O. |
33b53716b mtd: create funct... |
1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 |
* * Note, this function also makes sure that the allocated buffer is aligned to * the MTD device's min. I/O unit, i.e. the "mtd->writesize" value. * * This is called, for example by mtd_{read,write} and jffs2_scan_medium, * to handle smaller (i.e. degraded) buffer allocations under low- or * fragmented-memory situations where such reduced allocations, from a * requested ideal, are allowed. * * Returns a pointer to the allocated buffer on success; otherwise, NULL. */ void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size) { |
d0164adc8 mm, page_alloc: d... |
1685 |
gfp_t flags = __GFP_NOWARN | __GFP_DIRECT_RECLAIM | __GFP_NORETRY; |
33b53716b mtd: create funct... |
1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 |
size_t min_alloc = max_t(size_t, mtd->writesize, PAGE_SIZE); void *kbuf; *size = min_t(size_t, *size, KMALLOC_MAX_SIZE); while (*size > min_alloc) { kbuf = kmalloc(*size, flags); if (kbuf) return kbuf; *size >>= 1; *size = ALIGN(*size, mtd->writesize); } /* * For the last resort allocation allow 'kmalloc()' to do all sorts of * things (write-back, dropping caches, etc) by using GFP_KERNEL. */ return kmalloc(*size, GFP_KERNEL); } |
33b53716b mtd: create funct... |
1706 |
EXPORT_SYMBOL_GPL(mtd_kmalloc_up_to); |
1da177e4c Linux-2.6.12-rc2 |
1707 |
|
2d2dce0eb [PATCH] Kill ifde... |
1708 |
#ifdef CONFIG_PROC_FS |
1da177e4c Linux-2.6.12-rc2 |
1709 |
/*====================================================================*/ |
1da177e4c Linux-2.6.12-rc2 |
1710 |
/* Support for /proc/mtd */ |
447d9bd82 mtd: convert to s... |
1711 |
static int mtd_proc_show(struct seq_file *m, void *v) |
1da177e4c Linux-2.6.12-rc2 |
1712 |
{ |
f1332ba2f mtd: Introduce an... |
1713 |
struct mtd_info *mtd; |
1da177e4c Linux-2.6.12-rc2 |
1714 |
|
447d9bd82 mtd: convert to s... |
1715 1716 |
seq_puts(m, "dev: size erasesize name "); |
48b192686 [PATCH] sem2mutex... |
1717 |
mutex_lock(&mtd_table_mutex); |
f1332ba2f mtd: Introduce an... |
1718 |
mtd_for_each_device(mtd) { |
447d9bd82 mtd: convert to s... |
1719 1720 1721 1722 |
seq_printf(m, "mtd%d: %8.8llx %8.8x \"%s\" ", mtd->index, (unsigned long long)mtd->size, mtd->erasesize, mtd->name); |
d5ca51292 mtd:fix the bad f... |
1723 |
} |
48b192686 [PATCH] sem2mutex... |
1724 |
mutex_unlock(&mtd_table_mutex); |
d5ca51292 mtd:fix the bad f... |
1725 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1726 |
} |
447d9bd82 mtd: convert to s... |
1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 |
static int mtd_proc_open(struct inode *inode, struct file *file) { return single_open(file, mtd_proc_show, NULL); } static const struct file_operations mtd_proc_ops = { .open = mtd_proc_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; |
45b090761 [MTD] sysfs suppo... |
1738 |
#endif /* CONFIG_PROC_FS */ |
1da177e4c Linux-2.6.12-rc2 |
1739 1740 |
/*====================================================================*/ /* Init code */ |
445caaa20 mtd: Allocate bdi... |
1741 |
static struct backing_dev_info * __init mtd_bdi_init(char *name) |
0661b1ac5 mtd: ensure that ... |
1742 |
{ |
445caaa20 mtd: Allocate bdi... |
1743 |
struct backing_dev_info *bdi; |
0661b1ac5 mtd: ensure that ... |
1744 |
int ret; |
fa06052d6 mtd: Convert to d... |
1745 |
bdi = bdi_alloc(GFP_KERNEL); |
445caaa20 mtd: Allocate bdi... |
1746 1747 |
if (!bdi) return ERR_PTR(-ENOMEM); |
0661b1ac5 mtd: ensure that ... |
1748 |
|
fa06052d6 mtd: Convert to d... |
1749 1750 1751 1752 1753 |
bdi->name = name; /* * We put '-0' suffix to the name to get the same name format as we * used to get. Since this is called only once, we get a unique name. */ |
7c4cc3002 bdi: Drop 'parent... |
1754 |
ret = bdi_register(bdi, "%.28s-0", name); |
0661b1ac5 mtd: ensure that ... |
1755 |
if (ret) |
fa06052d6 mtd: Convert to d... |
1756 |
bdi_put(bdi); |
0661b1ac5 mtd: ensure that ... |
1757 |
|
445caaa20 mtd: Allocate bdi... |
1758 |
return ret ? ERR_PTR(ret) : bdi; |
0661b1ac5 mtd: ensure that ... |
1759 |
} |
93e562141 mtd: mtdcore: rem... |
1760 |
static struct proc_dir_entry *proc_mtd; |
1da177e4c Linux-2.6.12-rc2 |
1761 1762 |
static int __init init_mtd(void) { |
15bce40cb [MTD] Restore sus... |
1763 |
int ret; |
0661b1ac5 mtd: ensure that ... |
1764 |
|
15bce40cb [MTD] Restore sus... |
1765 |
ret = class_register(&mtd_class); |
0661b1ac5 mtd: ensure that ... |
1766 1767 |
if (ret) goto err_reg; |
445caaa20 mtd: Allocate bdi... |
1768 1769 1770 |
mtd_bdi = mtd_bdi_init("mtd"); if (IS_ERR(mtd_bdi)) { ret = PTR_ERR(mtd_bdi); |
b4caecd48 fs: introduce f_o... |
1771 |
goto err_bdi; |
445caaa20 mtd: Allocate bdi... |
1772 |
} |
694bb7fc1 [MTD] driver mode... |
1773 |
|
447d9bd82 mtd: convert to s... |
1774 |
proc_mtd = proc_create("mtd", 0, NULL, &mtd_proc_ops); |
93e562141 mtd: mtdcore: rem... |
1775 |
|
660685d9d mtd: merge mtdcha... |
1776 1777 1778 |
ret = init_mtdchar(); if (ret) goto out_procfs; |
1da177e4c Linux-2.6.12-rc2 |
1779 |
return 0; |
0661b1ac5 mtd: ensure that ... |
1780 |
|
660685d9d mtd: merge mtdcha... |
1781 1782 1783 |
out_procfs: if (proc_mtd) remove_proc_entry("mtd", NULL); |
fa06052d6 mtd: Convert to d... |
1784 |
bdi_put(mtd_bdi); |
b4caecd48 fs: introduce f_o... |
1785 |
err_bdi: |
0661b1ac5 mtd: ensure that ... |
1786 1787 1788 1789 1790 |
class_unregister(&mtd_class); err_reg: pr_err("Error registering mtd class or bdi: %d ", ret); return ret; |
1da177e4c Linux-2.6.12-rc2 |
1791 1792 1793 1794 |
} static void __exit cleanup_mtd(void) { |
660685d9d mtd: merge mtdcha... |
1795 |
cleanup_mtdchar(); |
d5ca51292 mtd:fix the bad f... |
1796 |
if (proc_mtd) |
93e562141 mtd: mtdcore: rem... |
1797 |
remove_proc_entry("mtd", NULL); |
15bce40cb [MTD] Restore sus... |
1798 |
class_unregister(&mtd_class); |
fa06052d6 mtd: Convert to d... |
1799 |
bdi_put(mtd_bdi); |
35667b998 mtd: Destroy mtd_... |
1800 |
idr_destroy(&mtd_idr); |
1da177e4c Linux-2.6.12-rc2 |
1801 1802 1803 1804 |
} module_init(init_mtd); module_exit(cleanup_mtd); |
1da177e4c Linux-2.6.12-rc2 |
1805 1806 1807 |
MODULE_LICENSE("GPL"); MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); MODULE_DESCRIPTION("Core MTD registration and access routines"); |