2005-04-16 16:20:36 -06:00
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/*
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* Core registration and callback routines for MTD
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* drivers and users.
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*
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2010-08-08 13:58:20 -06:00
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* Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
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* Copyright © 2006 Red Hat UK Limited
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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2005-04-16 16:20:36 -06:00
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/ptrace.h>
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2011-05-13 14:34:19 -06:00
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#include <linux/seq_file.h>
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2005-04-16 16:20:36 -06:00
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#include <linux/string.h>
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#include <linux/timer.h>
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#include <linux/major.h>
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#include <linux/fs.h>
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2006-10-11 05:52:44 -06:00
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#include <linux/err.h>
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2005-04-16 16:20:36 -06:00
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#include <linux/ioctl.h>
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#include <linux/init.h>
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2015-11-11 17:26:04 -07:00
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#include <linux/of.h>
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2005-04-16 16:20:36 -06:00
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#include <linux/proc_fs.h>
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2010-01-29 13:59:42 -07:00
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#include <linux/idr.h>
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2010-04-27 01:40:52 -06:00
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#include <linux/backing-dev.h>
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2010-03-29 11:52:39 -06:00
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#include <linux/gfp.h>
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2013-04-11 16:51:01 -06:00
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#include <linux/slab.h>
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2014-11-26 02:01:08 -07:00
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#include <linux/reboot.h>
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2016-04-12 14:46:42 -06:00
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#include <linux/leds.h>
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2005-04-16 16:20:36 -06:00
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#include <linux/mtd/mtd.h>
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2011-05-23 10:15:46 -06:00
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#include <linux/mtd/partitions.h>
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2005-04-16 16:20:36 -06:00
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2007-05-28 13:28:34 -06:00
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#include "mtdcore.h"
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mtd: merge mtdchar module with mtdcore
The MTD subsystem has historically tried to be as configurable as possible. The
side-effect of this is that its configuration menu is rather large, and we are
gradually shrinking it. For example, we recently merged partitions support with
the mtdcore.
This patch does the next step - it merges the mtdchar module to mtdcore. And in
this case this is not only about eliminating too fine-grained separation and
simplifying the configuration menu. This is also about eliminating seemingly
useless kernel module.
Indeed, mtdchar is a module that allows user-space making use of MTD devices
via /dev/mtd* character devices. If users do not enable it, they simply cannot
use MTD devices at all. They cannot read or write the flash contents. Is it a
sane and useful setup? I believe not. And everyone just enables mtdchar.
Having mtdchar separate is also a little bit harmful. People sometimes miss the
fact that they need to enable an additional configuration option to have
user-space MTD interfaces, and then they wonder why on earth the kernel does
not allow using the flash? They spend time asking around.
Thus, let's just get rid of this module and make it part of mtd core.
Note, mtdchar had additional configuration option to enable OTP interfaces,
which are present on some flashes. I removed that option as well - it saves a
really tiny amount space.
[dwmw2: Strictly speaking, you can mount file systems on MTD devices just
fine without the mtdchar (or mtdblock) devices; you just can't do
other manipulations directly on the underlying device. But still I
agree that it makes sense to make this unconditional. And Yay! we
get to kill off an instance of checking CONFIG_foo_MODULE, which is
an abomination that should never happen.]
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2013-03-14 05:27:40 -06:00
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2016-08-04 08:01:15 -06:00
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static struct backing_dev_info *mtd_bdi;
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2007-05-28 13:28:34 -06:00
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2015-04-06 04:00:39 -06:00
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#ifdef CONFIG_PM_SLEEP
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static int mtd_cls_suspend(struct device *dev)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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return mtd ? mtd_suspend(mtd) : 0;
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}
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static int mtd_cls_resume(struct device *dev)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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if (mtd)
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mtd_resume(mtd);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(mtd_cls_pm_ops, mtd_cls_suspend, mtd_cls_resume);
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#define MTD_CLS_PM_OPS (&mtd_cls_pm_ops)
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#else
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#define MTD_CLS_PM_OPS NULL
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#endif
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2009-04-05 08:40:58 -06:00
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static struct class mtd_class = {
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.name = "mtd",
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.owner = THIS_MODULE,
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2015-04-06 04:00:39 -06:00
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.pm = MTD_CLS_PM_OPS,
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2009-04-05 08:40:58 -06:00
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};
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2009-03-26 01:42:41 -06:00
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2010-01-29 13:59:42 -07:00
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static DEFINE_IDR(mtd_idr);
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2005-11-07 04:15:26 -07:00
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/* These are exported solely for the purpose of mtd_blkdevs.c. You
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2005-04-16 16:20:36 -06:00
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should not use them for _anything_ else */
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2006-03-31 03:29:41 -07:00
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DEFINE_MUTEX(mtd_table_mutex);
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2005-04-16 16:20:36 -06:00
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EXPORT_SYMBOL_GPL(mtd_table_mutex);
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2010-01-29 13:59:42 -07:00
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struct mtd_info *__mtd_next_device(int i)
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{
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return idr_get_next(&mtd_idr, &i);
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}
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EXPORT_SYMBOL_GPL(__mtd_next_device);
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2005-04-16 16:20:36 -06:00
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static LIST_HEAD(mtd_notifiers);
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2009-03-26 01:42:41 -06:00
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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
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* the mtd_info will probably want to use the release() hook...
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*/
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static void mtd_release(struct device *dev)
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{
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2014-07-21 20:06:47 -06:00
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struct mtd_info *mtd = dev_get_drvdata(dev);
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2011-12-29 09:00:29 -07:00
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dev_t index = MTD_DEVT(mtd->index);
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2009-03-26 01:42:41 -06:00
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2014-07-21 20:06:47 -06:00
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/* remove /dev/mtdXro node */
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device_destroy(&mtd_class, index + 1);
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2009-04-05 08:40:58 -06:00
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}
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2009-03-26 01:42:41 -06:00
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static ssize_t mtd_type_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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2011-12-29 09:00:29 -07:00
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struct mtd_info *mtd = dev_get_drvdata(dev);
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2009-03-26 01:42:41 -06:00
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char *type;
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switch (mtd->type) {
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case MTD_ABSENT:
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type = "absent";
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break;
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case MTD_RAM:
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type = "ram";
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break;
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case MTD_ROM:
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type = "rom";
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break;
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case MTD_NORFLASH:
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type = "nor";
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break;
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case MTD_NANDFLASH:
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type = "nand";
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break;
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case MTD_DATAFLASH:
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type = "dataflash";
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break;
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case MTD_UBIVOLUME:
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type = "ubi";
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break;
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2013-09-25 00:58:19 -06:00
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case MTD_MLCNANDFLASH:
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type = "mlc-nand";
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break;
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2009-03-26 01:42:41 -06:00
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default:
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type = "unknown";
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}
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return snprintf(buf, PAGE_SIZE, "%s\n", type);
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}
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2009-04-03 14:00:45 -06:00
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static DEVICE_ATTR(type, S_IRUGO, mtd_type_show, NULL);
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static ssize_t mtd_flags_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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2011-12-29 09:00:29 -07:00
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struct mtd_info *mtd = dev_get_drvdata(dev);
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2009-04-03 14:00:45 -06:00
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return snprintf(buf, PAGE_SIZE, "0x%lx\n", (unsigned long)mtd->flags);
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}
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static DEVICE_ATTR(flags, S_IRUGO, mtd_flags_show, NULL);
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static ssize_t mtd_size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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2011-12-29 09:00:29 -07:00
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struct mtd_info *mtd = dev_get_drvdata(dev);
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2009-04-03 14:00:45 -06:00
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return snprintf(buf, PAGE_SIZE, "%llu\n",
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(unsigned long long)mtd->size);
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}
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static DEVICE_ATTR(size, S_IRUGO, mtd_size_show, NULL);
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static ssize_t mtd_erasesize_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
|
2011-12-29 09:00:29 -07:00
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struct mtd_info *mtd = dev_get_drvdata(dev);
|
2009-04-03 14:00:45 -06:00
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return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->erasesize);
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}
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static DEVICE_ATTR(erasesize, S_IRUGO, mtd_erasesize_show, NULL);
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static ssize_t mtd_writesize_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
|
2011-12-29 09:00:29 -07:00
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struct mtd_info *mtd = dev_get_drvdata(dev);
|
2009-04-03 14:00:45 -06:00
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return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->writesize);
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}
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static DEVICE_ATTR(writesize, S_IRUGO, mtd_writesize_show, NULL);
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2009-04-18 03:29:42 -06:00
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static ssize_t mtd_subpagesize_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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2011-12-29 09:00:29 -07:00
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struct mtd_info *mtd = dev_get_drvdata(dev);
|
2009-04-18 03:29:42 -06:00
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unsigned int subpagesize = mtd->writesize >> mtd->subpage_sft;
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return snprintf(buf, PAGE_SIZE, "%u\n", subpagesize);
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}
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static DEVICE_ATTR(subpagesize, S_IRUGO, mtd_subpagesize_show, NULL);
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2009-04-03 14:00:45 -06:00
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static ssize_t mtd_oobsize_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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2011-12-29 09:00:29 -07:00
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struct mtd_info *mtd = dev_get_drvdata(dev);
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2009-04-03 14:00:45 -06:00
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return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->oobsize);
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}
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static DEVICE_ATTR(oobsize, S_IRUGO, mtd_oobsize_show, NULL);
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static ssize_t mtd_numeraseregions_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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2011-12-29 09:00:29 -07:00
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struct mtd_info *mtd = dev_get_drvdata(dev);
|
2009-04-03 14:00:45 -06:00
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return snprintf(buf, PAGE_SIZE, "%u\n", mtd->numeraseregions);
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}
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static DEVICE_ATTR(numeraseregions, S_IRUGO, mtd_numeraseregions_show,
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NULL);
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static ssize_t mtd_name_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
|
2011-12-29 09:00:29 -07:00
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struct mtd_info *mtd = dev_get_drvdata(dev);
|
2009-04-03 14:00:45 -06:00
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return snprintf(buf, PAGE_SIZE, "%s\n", mtd->name);
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}
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static DEVICE_ATTR(name, S_IRUGO, mtd_name_show, NULL);
|
2009-03-26 01:42:41 -06:00
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|
2012-04-25 13:06:07 -06:00
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static ssize_t mtd_ecc_strength_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
|
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return snprintf(buf, PAGE_SIZE, "%u\n", mtd->ecc_strength);
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}
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static DEVICE_ATTR(ecc_strength, S_IRUGO, mtd_ecc_strength_show, NULL);
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|
2012-04-25 13:06:08 -06:00
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static ssize_t mtd_bitflip_threshold_show(struct device *dev,
|
|
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struct device_attribute *attr,
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char *buf)
|
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|
|
{
|
|
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|
struct mtd_info *mtd = dev_get_drvdata(dev);
|
|
|
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return snprintf(buf, PAGE_SIZE, "%u\n", mtd->bitflip_threshold);
|
|
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|
}
|
|
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static ssize_t mtd_bitflip_threshold_store(struct device *dev,
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|
|
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struct device_attribute *attr,
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|
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const char *buf, size_t count)
|
|
|
|
{
|
|
|
|
struct mtd_info *mtd = dev_get_drvdata(dev);
|
|
|
|
unsigned int bitflip_threshold;
|
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|
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int retval;
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retval = kstrtouint(buf, 0, &bitflip_threshold);
|
|
|
|
if (retval)
|
|
|
|
return retval;
|
|
|
|
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|
|
mtd->bitflip_threshold = bitflip_threshold;
|
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|
|
return count;
|
|
|
|
}
|
|
|
|
static DEVICE_ATTR(bitflip_threshold, S_IRUGO | S_IWUSR,
|
|
|
|
mtd_bitflip_threshold_show,
|
|
|
|
mtd_bitflip_threshold_store);
|
|
|
|
|
2013-08-15 20:10:05 -06:00
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|
static ssize_t mtd_ecc_step_size_show(struct device *dev,
|
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|
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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\n", mtd->ecc_step_size);
|
|
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|
|
}
|
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|
static DEVICE_ATTR(ecc_step_size, S_IRUGO, mtd_ecc_step_size_show, NULL);
|
|
|
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|
2014-06-24 07:55:50 -06:00
|
|
|
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\n", ecc_stats->corrected);
|
|
|
|
}
|
|
|
|
static DEVICE_ATTR(corrected_bits, S_IRUGO,
|
|
|
|
mtd_ecc_stats_corrected_show, NULL);
|
|
|
|
|
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|
|
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\n", 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\n", 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\n", ecc_stats->bbtblocks);
|
|
|
|
}
|
|
|
|
static DEVICE_ATTR(bbt_blocks, S_IRUGO, mtd_bbtblocks_show, NULL);
|
|
|
|
|
2009-03-26 01:42:41 -06:00
|
|
|
static struct attribute *mtd_attrs[] = {
|
2009-04-03 14:00:45 -06:00
|
|
|
&dev_attr_type.attr,
|
|
|
|
&dev_attr_flags.attr,
|
|
|
|
&dev_attr_size.attr,
|
|
|
|
&dev_attr_erasesize.attr,
|
|
|
|
&dev_attr_writesize.attr,
|
2009-04-18 03:29:42 -06:00
|
|
|
&dev_attr_subpagesize.attr,
|
2009-04-03 14:00:45 -06:00
|
|
|
&dev_attr_oobsize.attr,
|
|
|
|
&dev_attr_numeraseregions.attr,
|
|
|
|
&dev_attr_name.attr,
|
2012-04-25 13:06:07 -06:00
|
|
|
&dev_attr_ecc_strength.attr,
|
2013-08-15 20:10:05 -06:00
|
|
|
&dev_attr_ecc_step_size.attr,
|
2014-06-24 07:55:50 -06:00
|
|
|
&dev_attr_corrected_bits.attr,
|
|
|
|
&dev_attr_ecc_failures.attr,
|
|
|
|
&dev_attr_bad_blocks.attr,
|
|
|
|
&dev_attr_bbt_blocks.attr,
|
2012-04-25 13:06:08 -06:00
|
|
|
&dev_attr_bitflip_threshold.attr,
|
2009-03-26 01:42:41 -06:00
|
|
|
NULL,
|
|
|
|
};
|
2013-12-01 19:12:25 -07:00
|
|
|
ATTRIBUTE_GROUPS(mtd);
|
2009-03-26 01:42:41 -06:00
|
|
|
|
|
|
|
static struct device_type mtd_devtype = {
|
|
|
|
.name = "mtd",
|
|
|
|
.groups = mtd_groups,
|
|
|
|
.release = mtd_release,
|
|
|
|
};
|
|
|
|
|
2015-01-14 02:42:32 -07:00
|
|
|
#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;
|
|
|
|
}
|
|
|
|
}
|
2015-01-28 11:09:20 -07:00
|
|
|
EXPORT_SYMBOL_GPL(mtd_mmap_capabilities);
|
2015-01-14 02:42:32 -07:00
|
|
|
#endif
|
|
|
|
|
2014-11-26 02:01:08 -07:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2015-11-16 07:53:13 -07:00
|
|
|
/**
|
|
|
|
* 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);
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/**
|
|
|
|
* 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
|
2015-06-01 17:17:18 -06:00
|
|
|
* zero on success or non-zero on failure.
|
2005-04-16 16:20:36 -06:00
|
|
|
*/
|
|
|
|
|
|
|
|
int add_mtd_device(struct mtd_info *mtd)
|
|
|
|
{
|
2010-01-29 13:59:42 -07:00
|
|
|
struct mtd_notifier *not;
|
|
|
|
int i, error;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2015-06-01 17:17:20 -06:00
|
|
|
/*
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
if (WARN_ONCE(mtd->backing_dev_info, "MTD already registered\n"))
|
|
|
|
return -EEXIST;
|
|
|
|
|
2016-08-04 08:01:15 -06:00
|
|
|
mtd->backing_dev_info = mtd_bdi;
|
2009-02-12 03:40:00 -07:00
|
|
|
|
2006-06-14 09:53:44 -06:00
|
|
|
BUG_ON(mtd->writesize == 0);
|
2006-03-31 03:29:41 -07:00
|
|
|
mutex_lock(&mtd_table_mutex);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2013-02-27 18:04:33 -07:00
|
|
|
i = idr_alloc(&mtd_idr, mtd, 0, 0, GFP_KERNEL);
|
2015-06-01 17:17:18 -06:00
|
|
|
if (i < 0) {
|
|
|
|
error = i;
|
2010-01-29 13:59:42 -07:00
|
|
|
goto fail_locked;
|
2015-06-01 17:17:18 -06:00
|
|
|
}
|
2009-03-26 01:42:41 -06:00
|
|
|
|
2010-01-29 13:59:42 -07:00
|
|
|
mtd->index = i;
|
|
|
|
mtd->usecount = 0;
|
|
|
|
|
2012-04-25 13:06:08 -06:00
|
|
|
/* default value if not set by driver */
|
|
|
|
if (mtd->bitflip_threshold == 0)
|
|
|
|
mtd->bitflip_threshold = mtd->ecc_strength;
|
|
|
|
|
2010-01-29 13:59:42 -07:00
|
|
|
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 */
|
2011-12-30 08:00:35 -07:00
|
|
|
if ((mtd->flags & MTD_WRITEABLE) && (mtd->flags & MTD_POWERUP_LOCK)) {
|
|
|
|
error = mtd_unlock(mtd, 0, mtd->size);
|
|
|
|
if (error && error != -EOPNOTSUPP)
|
2010-01-29 13:59:42 -07:00
|
|
|
printk(KERN_WARNING
|
|
|
|
"%s: unlock failed, writes may not work\n",
|
|
|
|
mtd->name);
|
2015-06-01 17:17:18 -06:00
|
|
|
/* Ignore unlock failures? */
|
|
|
|
error = 0;
|
2010-01-29 13:59:42 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Caller should have set dev.parent to match the
|
2015-06-10 14:38:15 -06:00
|
|
|
* physical device, if appropriate.
|
2010-01-29 13:59:42 -07:00
|
|
|
*/
|
|
|
|
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);
|
2015-11-11 17:26:04 -07:00
|
|
|
of_node_get(mtd_get_of_node(mtd));
|
2015-06-01 17:17:18 -06:00
|
|
|
error = device_register(&mtd->dev);
|
|
|
|
if (error)
|
2010-01-29 13:59:42 -07:00
|
|
|
goto fail_added;
|
|
|
|
|
2014-07-21 20:06:47 -06:00
|
|
|
device_create(&mtd_class, mtd->dev.parent, MTD_DEVT(i) + 1, NULL,
|
|
|
|
"mtd%dro", i);
|
2010-01-29 13:59:42 -07:00
|
|
|
|
2011-07-19 11:06:09 -06:00
|
|
|
pr_debug("mtd: Giving out device %d to %s\n", i, mtd->name);
|
2010-01-29 13:59:42 -07:00
|
|
|
/* 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;
|
2005-11-07 04:15:26 -07:00
|
|
|
|
2010-01-29 13:59:42 -07:00
|
|
|
fail_added:
|
2015-11-11 17:26:04 -07:00
|
|
|
of_node_put(mtd_get_of_node(mtd));
|
2010-01-29 13:59:42 -07:00
|
|
|
idr_remove(&mtd_idr, i);
|
|
|
|
fail_locked:
|
2006-03-31 03:29:41 -07:00
|
|
|
mutex_unlock(&mtd_table_mutex);
|
2015-06-01 17:17:18 -06:00
|
|
|
return error;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
|
2011-05-23 03:23:42 -06:00
|
|
|
int del_mtd_device(struct mtd_info *mtd)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
int ret;
|
2010-02-22 11:39:32 -07:00
|
|
|
struct mtd_notifier *not;
|
2005-11-07 04:15:26 -07:00
|
|
|
|
2006-03-31 03:29:41 -07:00
|
|
|
mutex_lock(&mtd_table_mutex);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2010-01-29 13:59:42 -07:00
|
|
|
if (idr_find(&mtd_idr, mtd->index) != mtd) {
|
2005-04-16 16:20:36 -06:00
|
|
|
ret = -ENODEV;
|
2010-02-22 11:39:32 -07:00
|
|
|
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) {
|
2005-11-07 04:15:26 -07:00
|
|
|
printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n",
|
2005-04-16 16:20:36 -06:00
|
|
|
mtd->index, mtd->name, mtd->usecount);
|
|
|
|
ret = -EBUSY;
|
|
|
|
} else {
|
2009-04-03 14:00:45 -06:00
|
|
|
device_unregister(&mtd->dev);
|
|
|
|
|
2010-01-29 13:59:42 -07:00
|
|
|
idr_remove(&mtd_idr, mtd->index);
|
2015-11-11 17:26:04 -07:00
|
|
|
of_node_put(mtd_get_of_node(mtd));
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
module_put(THIS_MODULE);
|
|
|
|
ret = 0;
|
|
|
|
}
|
|
|
|
|
2010-02-22 11:39:32 -07:00
|
|
|
out_error:
|
2006-03-31 03:29:41 -07:00
|
|
|
mutex_unlock(&mtd_table_mutex);
|
2005-04-16 16:20:36 -06:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2015-04-02 16:15:10 -06:00
|
|
|
static int mtd_add_device_partitions(struct mtd_info *mtd,
|
2015-12-04 16:25:17 -07:00
|
|
|
struct mtd_partitions *parts)
|
2015-04-02 16:15:10 -06:00
|
|
|
{
|
2015-12-04 16:25:17 -07:00
|
|
|
const struct mtd_partition *real_parts = parts->parts;
|
|
|
|
int nbparts = parts->nr_parts;
|
2015-04-02 16:15:10 -06:00
|
|
|
int ret;
|
|
|
|
|
|
|
|
if (nbparts == 0 || IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER)) {
|
|
|
|
ret = add_mtd_device(mtd);
|
2015-06-01 17:17:18 -06:00
|
|
|
if (ret)
|
|
|
|
return ret;
|
2015-04-02 16:15:10 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2015-12-11 16:58:01 -07:00
|
|
|
/*
|
|
|
|
* 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\n");
|
|
|
|
}
|
|
|
|
}
|
2015-04-02 16:15:10 -06:00
|
|
|
|
2011-03-25 13:26:25 -06:00
|
|
|
/**
|
|
|
|
* 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
|
2011-06-10 08:18:28 -06:00
|
|
|
* @parser_data: MTD partition parser-specific data
|
2011-03-25 13:26:25 -06:00
|
|
|
* @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.
|
2011-07-20 10:53:42 -06:00
|
|
|
* * If any partitioning info was found, this function registers the found
|
2015-04-02 16:15:10 -06:00
|
|
|
* partitions. If the MTD_PARTITIONED_MASTER option is set, then the device
|
|
|
|
* as a whole is registered first.
|
2011-03-25 13:26:25 -06:00
|
|
|
* * 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.
|
|
|
|
*/
|
2013-03-11 07:38:48 -06:00
|
|
|
int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types,
|
2011-06-10 08:18:28 -06:00
|
|
|
struct mtd_part_parser_data *parser_data,
|
2011-03-25 13:26:25 -06:00
|
|
|
const struct mtd_partition *parts,
|
|
|
|
int nr_parts)
|
|
|
|
{
|
2015-12-04 16:25:17 -07:00
|
|
|
struct mtd_partitions parsed;
|
2015-04-02 16:15:10 -06:00
|
|
|
int ret;
|
2011-03-25 13:26:25 -06:00
|
|
|
|
2015-12-11 16:58:01 -07:00
|
|
|
mtd_set_dev_defaults(mtd);
|
|
|
|
|
2015-12-04 16:25:17 -07:00
|
|
|
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 */
|
2015-10-11 14:03:47 -06:00
|
|
|
pr_info("mtd: failed to find partitions; one or more parsers reports errors (%d)\n",
|
|
|
|
ret);
|
|
|
|
/* Don't abort on errors; we can still use unpartitioned MTD */
|
2015-12-04 16:25:17 -07:00
|
|
|
memset(&parsed, 0, sizeof(parsed));
|
2015-06-01 17:17:19 -06:00
|
|
|
}
|
2011-03-25 13:26:25 -06:00
|
|
|
|
2015-12-04 16:25:17 -07:00
|
|
|
ret = mtd_add_device_partitions(mtd, &parsed);
|
2015-06-01 17:17:19 -06:00
|
|
|
if (ret)
|
|
|
|
goto out;
|
2011-03-25 13:26:25 -06:00
|
|
|
|
2015-01-31 18:08:50 -07:00
|
|
|
/*
|
|
|
|
* 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).
|
|
|
|
*/
|
mtd: don't WARN about overloaded users of mtd->reboot_notifier.notifier_call
There are multiple types of users of mtd->reboot_notifier.notifier_call:
(1) A while back, the cfi_cmdset_000{1,2} chip drivers implemented a
reboot notifier to (on a best effort basis) attempt to reset their flash
chips before rebooting.
(2) More recently, we implemented a common _reboot() hook so that MTD
drivers (particularly, NAND flash) could better halt I/O operations
without having to reimplement the same notifier boilerplate.
Currently, the WARN_ONCE() condition here was written to handle (2), but
at the same time it mis-diagnosed case (1) as an already-registered MTD.
Let's fix this by having the WARN_ONCE() condition better imitate the
condition that immediately follows it. (Wow, I don't know how I missed
that one.)
(Side note: Unfortunately, we can't yet combine the reboot notifier code
for (1) and (2) with a patch like [1], because some users of (1) also
use mtdconcat, and so the mtd_info struct from cfi_cmdset_000{1,2} won't
actually get registered with mtdcore, and therefore their reboot
notifier won't get registered.)
[1] http://patchwork.ozlabs.org/patch/417981/
Suggested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Cc: Jesper Nilsson <jespern@axis.com>
Cc: linux-cris-kernel@axis.com
Tested-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
2015-11-03 18:01:53 -07:00
|
|
|
WARN_ONCE(mtd->_reboot && mtd->reboot_notifier.notifier_call,
|
|
|
|
"MTD already registered\n");
|
2015-01-31 18:08:50 -07:00
|
|
|
if (mtd->_reboot && !mtd->reboot_notifier.notifier_call) {
|
2014-11-26 02:01:08 -07:00
|
|
|
mtd->reboot_notifier.notifier_call = mtd_reboot_notifier;
|
|
|
|
register_reboot_notifier(&mtd->reboot_notifier);
|
|
|
|
}
|
|
|
|
|
2015-06-01 17:17:19 -06:00
|
|
|
out:
|
2015-12-04 16:25:16 -07:00
|
|
|
/* Cleanup any parsed partitions */
|
2015-12-09 11:24:03 -07:00
|
|
|
mtd_part_parser_cleanup(&parsed);
|
2015-04-02 16:15:10 -06:00
|
|
|
return ret;
|
2011-03-25 13:26:25 -06:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(mtd_device_parse_register);
|
|
|
|
|
2011-05-23 10:15:46 -06:00
|
|
|
/**
|
|
|
|
* 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;
|
|
|
|
|
2014-11-26 02:01:08 -07:00
|
|
|
if (master->_reboot)
|
|
|
|
unregister_reboot_notifier(&master->reboot_notifier);
|
|
|
|
|
2011-05-23 10:15:46 -06:00
|
|
|
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);
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/**
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
void register_mtd_user (struct mtd_notifier *new)
|
|
|
|
{
|
2010-01-29 13:57:11 -07:00
|
|
|
struct mtd_info *mtd;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2006-03-31 03:29:41 -07:00
|
|
|
mutex_lock(&mtd_table_mutex);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
list_add(&new->list, &mtd_notifiers);
|
|
|
|
|
2011-05-20 07:14:30 -06:00
|
|
|
__module_get(THIS_MODULE);
|
2005-11-07 04:15:26 -07:00
|
|
|
|
2010-01-29 13:57:11 -07:00
|
|
|
mtd_for_each_device(mtd)
|
|
|
|
new->add(mtd);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2006-03-31 03:29:41 -07:00
|
|
|
mutex_unlock(&mtd_table_mutex);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
2011-12-30 07:11:14 -07:00
|
|
|
EXPORT_SYMBOL_GPL(register_mtd_user);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/**
|
2005-02-18 07:34:54 -07:00
|
|
|
* unregister_mtd_user - unregister a 'user' of MTD devices.
|
|
|
|
* @old: pointer to notifier info structure
|
2005-04-16 16:20:36 -06:00
|
|
|
*
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
int unregister_mtd_user (struct mtd_notifier *old)
|
|
|
|
{
|
2010-01-29 13:57:11 -07:00
|
|
|
struct mtd_info *mtd;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2006-03-31 03:29:41 -07:00
|
|
|
mutex_lock(&mtd_table_mutex);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
module_put(THIS_MODULE);
|
|
|
|
|
2010-01-29 13:57:11 -07:00
|
|
|
mtd_for_each_device(mtd)
|
|
|
|
old->remove(mtd);
|
2005-11-07 04:15:26 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
list_del(&old->list);
|
2006-03-31 03:29:41 -07:00
|
|
|
mutex_unlock(&mtd_table_mutex);
|
2005-04-16 16:20:36 -06:00
|
|
|
return 0;
|
|
|
|
}
|
2011-12-30 07:11:14 -07:00
|
|
|
EXPORT_SYMBOL_GPL(unregister_mtd_user);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/**
|
|
|
|
* 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
|
2006-10-11 05:52:47 -06:00
|
|
|
* both, return the num'th driver only if its address matches. Return
|
|
|
|
* error code if not.
|
2005-04-16 16:20:36 -06:00
|
|
|
*/
|
|
|
|
struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num)
|
|
|
|
{
|
2010-01-29 13:57:11 -07:00
|
|
|
struct mtd_info *ret = NULL, *other;
|
|
|
|
int err = -ENODEV;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2006-03-31 03:29:41 -07:00
|
|
|
mutex_lock(&mtd_table_mutex);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
if (num == -1) {
|
2010-01-29 13:57:11 -07:00
|
|
|
mtd_for_each_device(other) {
|
|
|
|
if (other == mtd) {
|
|
|
|
ret = mtd;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
2010-01-29 13:59:42 -07:00
|
|
|
} else if (num >= 0) {
|
|
|
|
ret = idr_find(&mtd_idr, num);
|
2005-04-16 16:20:36 -06:00
|
|
|
if (mtd && mtd != ret)
|
|
|
|
ret = NULL;
|
|
|
|
}
|
|
|
|
|
2010-02-22 11:39:28 -07:00
|
|
|
if (!ret) {
|
|
|
|
ret = ERR_PTR(err);
|
|
|
|
goto out;
|
2006-10-11 05:52:45 -06:00
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2010-02-22 11:39:28 -07:00
|
|
|
err = __get_mtd_device(ret);
|
|
|
|
if (err)
|
|
|
|
ret = ERR_PTR(err);
|
|
|
|
out:
|
2006-10-11 05:52:47 -06:00
|
|
|
mutex_unlock(&mtd_table_mutex);
|
|
|
|
return ret;
|
2010-02-22 11:39:28 -07:00
|
|
|
}
|
2011-12-30 07:11:14 -07:00
|
|
|
EXPORT_SYMBOL_GPL(get_mtd_device);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2010-02-22 11:39:28 -07:00
|
|
|
|
|
|
|
int __get_mtd_device(struct mtd_info *mtd)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
|
|
|
|
if (!try_module_get(mtd->owner))
|
|
|
|
return -ENODEV;
|
|
|
|
|
2012-01-30 05:58:32 -07:00
|
|
|
if (mtd->_get_device) {
|
|
|
|
err = mtd->_get_device(mtd);
|
2010-02-22 11:39:28 -07:00
|
|
|
|
|
|
|
if (err) {
|
|
|
|
module_put(mtd->owner);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
mtd->usecount++;
|
|
|
|
return 0;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
2011-12-30 07:11:14 -07:00
|
|
|
EXPORT_SYMBOL_GPL(__get_mtd_device);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2006-10-11 05:52:44 -06:00
|
|
|
/**
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
struct mtd_info *get_mtd_device_nm(const char *name)
|
|
|
|
{
|
2010-01-29 13:57:11 -07:00
|
|
|
int err = -ENODEV;
|
|
|
|
struct mtd_info *mtd = NULL, *other;
|
2006-10-11 05:52:44 -06:00
|
|
|
|
|
|
|
mutex_lock(&mtd_table_mutex);
|
|
|
|
|
2010-01-29 13:57:11 -07:00
|
|
|
mtd_for_each_device(other) {
|
|
|
|
if (!strcmp(name, other->name)) {
|
|
|
|
mtd = other;
|
2006-10-11 05:52:44 -06:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-10-11 05:52:45 -06:00
|
|
|
if (!mtd)
|
2006-10-11 05:52:44 -06:00
|
|
|
goto out_unlock;
|
|
|
|
|
2011-05-17 08:36:18 -06:00
|
|
|
err = __get_mtd_device(mtd);
|
|
|
|
if (err)
|
2006-10-11 05:52:44 -06:00
|
|
|
goto out_unlock;
|
|
|
|
|
2006-10-11 05:52:45 -06:00
|
|
|
mutex_unlock(&mtd_table_mutex);
|
|
|
|
return mtd;
|
2006-10-11 05:52:44 -06:00
|
|
|
|
|
|
|
out_unlock:
|
|
|
|
mutex_unlock(&mtd_table_mutex);
|
2006-10-11 05:52:45 -06:00
|
|
|
return ERR_PTR(err);
|
2006-10-11 05:52:44 -06:00
|
|
|
}
|
2011-12-30 07:11:14 -07:00
|
|
|
EXPORT_SYMBOL_GPL(get_mtd_device_nm);
|
2006-10-11 05:52:44 -06:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
void put_mtd_device(struct mtd_info *mtd)
|
|
|
|
{
|
2006-03-31 03:29:41 -07:00
|
|
|
mutex_lock(&mtd_table_mutex);
|
2010-02-22 11:39:28 -07:00
|
|
|
__put_mtd_device(mtd);
|
|
|
|
mutex_unlock(&mtd_table_mutex);
|
|
|
|
|
|
|
|
}
|
2011-12-30 07:11:14 -07:00
|
|
|
EXPORT_SYMBOL_GPL(put_mtd_device);
|
2010-02-22 11:39:28 -07:00
|
|
|
|
|
|
|
void __put_mtd_device(struct mtd_info *mtd)
|
|
|
|
{
|
|
|
|
--mtd->usecount;
|
|
|
|
BUG_ON(mtd->usecount < 0);
|
|
|
|
|
2012-01-30 05:58:32 -07:00
|
|
|
if (mtd->_put_device)
|
|
|
|
mtd->_put_device(mtd);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
module_put(mtd->owner);
|
|
|
|
}
|
2011-12-30 07:11:14 -07:00
|
|
|
EXPORT_SYMBOL_GPL(__put_mtd_device);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2012-02-03 05:34:14 -07:00
|
|
|
/*
|
|
|
|
* 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)
|
|
|
|
{
|
2014-07-21 20:06:27 -06:00
|
|
|
if (instr->addr >= mtd->size || instr->len > mtd->size - instr->addr)
|
2012-02-03 05:34:14 -07:00
|
|
|
return -EINVAL;
|
2012-02-03 09:13:23 -07:00
|
|
|
if (!(mtd->flags & MTD_WRITEABLE))
|
|
|
|
return -EROFS;
|
2012-02-09 06:36:29 -07:00
|
|
|
instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
|
2012-02-06 04:27:43 -07:00
|
|
|
if (!instr->len) {
|
|
|
|
instr->state = MTD_ERASE_DONE;
|
|
|
|
mtd_erase_callback(instr);
|
|
|
|
return 0;
|
|
|
|
}
|
2016-04-12 14:46:42 -06:00
|
|
|
ledtrig_mtd_activity();
|
2012-02-03 05:34:14 -07:00
|
|
|
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;
|
2012-02-08 06:13:26 -07:00
|
|
|
*virt = NULL;
|
|
|
|
if (phys)
|
|
|
|
*phys = 0;
|
2012-02-03 05:34:14 -07:00
|
|
|
if (!mtd->_point)
|
|
|
|
return -EOPNOTSUPP;
|
2014-07-21 20:06:27 -06:00
|
|
|
if (from < 0 || from >= mtd->size || len > mtd->size - from)
|
2012-02-03 05:34:14 -07:00
|
|
|
return -EINVAL;
|
2012-02-06 04:27:43 -07:00
|
|
|
if (!len)
|
|
|
|
return 0;
|
2012-02-03 05:34:14 -07:00
|
|
|
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;
|
2014-07-21 20:06:27 -06:00
|
|
|
if (from < 0 || from >= mtd->size || len > mtd->size - from)
|
2012-02-03 05:34:14 -07:00
|
|
|
return -EINVAL;
|
2012-02-06 04:27:43 -07:00
|
|
|
if (!len)
|
|
|
|
return 0;
|
2012-02-03 05:34:14 -07:00
|
|
|
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;
|
2014-07-21 20:06:27 -06:00
|
|
|
if (offset >= mtd->size || len > mtd->size - offset)
|
2012-02-03 05:34:14 -07:00
|
|
|
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)
|
|
|
|
{
|
2012-04-25 13:06:11 -06:00
|
|
|
int ret_code;
|
2012-02-06 03:39:07 -07:00
|
|
|
*retlen = 0;
|
2014-07-21 20:06:27 -06:00
|
|
|
if (from < 0 || from >= mtd->size || len > mtd->size - from)
|
2012-02-03 05:34:14 -07:00
|
|
|
return -EINVAL;
|
2012-02-06 04:27:43 -07:00
|
|
|
if (!len)
|
|
|
|
return 0;
|
2012-04-25 13:06:11 -06:00
|
|
|
|
2016-04-12 14:46:42 -06:00
|
|
|
ledtrig_mtd_activity();
|
2012-04-25 13:06:11 -06:00
|
|
|
/*
|
|
|
|
* 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;
|
2012-02-03 05:34:14 -07:00
|
|
|
}
|
|
|
|
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;
|
2014-07-21 20:06:27 -06:00
|
|
|
if (to < 0 || to >= mtd->size || len > mtd->size - to)
|
2012-02-03 05:34:14 -07:00
|
|
|
return -EINVAL;
|
2012-02-03 09:13:23 -07:00
|
|
|
if (!mtd->_write || !(mtd->flags & MTD_WRITEABLE))
|
|
|
|
return -EROFS;
|
2012-02-06 04:27:43 -07:00
|
|
|
if (!len)
|
|
|
|
return 0;
|
2016-04-12 14:46:42 -06:00
|
|
|
ledtrig_mtd_activity();
|
2012-02-03 05:34:14 -07:00
|
|
|
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;
|
2014-07-21 20:06:27 -06:00
|
|
|
if (to < 0 || to >= mtd->size || len > mtd->size - to)
|
2012-02-03 05:34:14 -07:00
|
|
|
return -EINVAL;
|
2012-02-03 09:13:23 -07:00
|
|
|
if (!(mtd->flags & MTD_WRITEABLE))
|
|
|
|
return -EROFS;
|
2012-02-06 04:27:43 -07:00
|
|
|
if (!len)
|
|
|
|
return 0;
|
2012-02-03 05:34:14 -07:00
|
|
|
return mtd->_panic_write(mtd, to, len, retlen, buf);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(mtd_panic_write);
|
|
|
|
|
2012-06-22 17:35:38 -06:00
|
|
|
int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
|
|
|
|
{
|
2012-06-22 17:35:39 -06:00
|
|
|
int ret_code;
|
2012-06-22 17:35:38 -06:00
|
|
|
ops->retlen = ops->oobretlen = 0;
|
|
|
|
if (!mtd->_read_oob)
|
|
|
|
return -EOPNOTSUPP;
|
2016-04-12 14:46:42 -06:00
|
|
|
|
|
|
|
ledtrig_mtd_activity();
|
2012-06-22 17:35:39 -06:00
|
|
|
/*
|
|
|
|
* 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;
|
2012-06-22 17:35:38 -06:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(mtd_read_oob);
|
|
|
|
|
2016-04-12 14:46:39 -06:00
|
|
|
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;
|
2016-04-12 14:46:42 -06:00
|
|
|
ledtrig_mtd_activity();
|
2016-04-12 14:46:39 -06:00
|
|
|
return mtd->_write_oob(mtd, to, ops);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(mtd_write_oob);
|
|
|
|
|
2016-02-04 01:52:30 -07:00
|
|
|
/**
|
|
|
|
* 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
|
|
|
|
*
|
2016-12-13 17:31:01 -07:00
|
|
|
* This function returns ECC section information in the OOB area. If you want
|
2016-02-04 01:52:30 -07:00
|
|
|
* 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)
|
|
|
|
{
|
|
|
|
memset(oobecc, 0, sizeof(*oobecc));
|
|
|
|
|
|
|
|
if (!mtd || section < 0)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2016-02-03 11:01:31 -07:00
|
|
|
if (!mtd->ooblayout || !mtd->ooblayout->ecc)
|
2016-02-04 01:52:30 -07:00
|
|
|
return -ENOTSUPP;
|
|
|
|
|
2016-02-03 11:01:31 -07:00
|
|
|
return mtd->ooblayout->ecc(mtd, section, oobecc);
|
2016-02-04 01:52:30 -07:00
|
|
|
}
|
|
|
|
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
|
|
|
|
*
|
2016-12-13 17:31:01 -07:00
|
|
|
* This function returns free bytes position in the OOB area. If you want
|
2016-02-04 01:52:30 -07:00
|
|
|
* 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;
|
|
|
|
|
2016-02-03 11:01:31 -07:00
|
|
|
if (!mtd->ooblayout || !mtd->ooblayout->free)
|
2016-02-04 01:52:30 -07:00
|
|
|
return -ENOTSUPP;
|
|
|
|
|
2016-02-03 11:01:31 -07:00
|
|
|
return mtd->ooblayout->free(mtd, section, oobfree);
|
2016-02-04 01:52:30 -07:00
|
|
|
}
|
|
|
|
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
|
|
|
|
*
|
2016-12-13 17:31:01 -07:00
|
|
|
* This function returns the section id and oobregion information of a
|
2016-02-04 01:52:30 -07:00
|
|
|
* 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))
|
|
|
|
{
|
2016-11-08 19:08:08 -07:00
|
|
|
struct mtd_oob_region oobregion;
|
|
|
|
int section, ret;
|
2016-02-04 01:52:30 -07:00
|
|
|
|
|
|
|
ret = mtd_ooblayout_find_region(mtd, start, §ion,
|
|
|
|
&oobregion, iter);
|
|
|
|
|
|
|
|
while (!ret) {
|
|
|
|
int cnt;
|
|
|
|
|
2016-11-08 19:08:09 -07:00
|
|
|
cnt = min_t(int, nbytes, oobregion.length);
|
2016-02-04 01:52:30 -07:00
|
|
|
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))
|
|
|
|
{
|
2016-11-08 19:08:08 -07:00
|
|
|
struct mtd_oob_region oobregion;
|
|
|
|
int section, ret;
|
2016-02-04 01:52:30 -07:00
|
|
|
|
|
|
|
ret = mtd_ooblayout_find_region(mtd, start, §ion,
|
|
|
|
&oobregion, iter);
|
|
|
|
|
|
|
|
while (!ret) {
|
|
|
|
int cnt;
|
|
|
|
|
2016-11-08 19:08:09 -07:00
|
|
|
cnt = min_t(int, nbytes, oobregion.length);
|
2016-02-04 01:52:30 -07:00
|
|
|
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))
|
|
|
|
{
|
2016-11-08 19:08:10 -07:00
|
|
|
struct mtd_oob_region oobregion;
|
2016-02-04 01:52:30 -07:00
|
|
|
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);
|
|
|
|
|
2012-02-08 07:37:14 -07:00
|
|
|
/*
|
|
|
|
* 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.
|
|
|
|
*/
|
2014-01-28 01:29:44 -07:00
|
|
|
int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
|
|
|
|
struct otp_info *buf)
|
2012-02-08 07:37:14 -07:00
|
|
|
{
|
|
|
|
if (!mtd->_get_fact_prot_info)
|
|
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!len)
|
|
|
|
return 0;
|
2014-01-28 01:29:44 -07:00
|
|
|
return mtd->_get_fact_prot_info(mtd, len, retlen, buf);
|
2012-02-08 07:37:14 -07:00
|
|
|
}
|
|
|
|
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);
|
|
|
|
|
2014-01-28 01:29:44 -07:00
|
|
|
int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
|
|
|
|
struct otp_info *buf)
|
2012-02-08 07:37:14 -07:00
|
|
|
{
|
|
|
|
if (!mtd->_get_user_prot_info)
|
|
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!len)
|
|
|
|
return 0;
|
2014-01-28 01:29:44 -07:00
|
|
|
return mtd->_get_user_prot_info(mtd, len, retlen, buf);
|
2012-02-08 07:37:14 -07:00
|
|
|
}
|
|
|
|
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)
|
|
|
|
{
|
2014-03-06 04:42:37 -07:00
|
|
|
int ret;
|
|
|
|
|
2012-02-08 07:37:14 -07:00
|
|
|
*retlen = 0;
|
|
|
|
if (!mtd->_write_user_prot_reg)
|
|
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!len)
|
|
|
|
return 0;
|
2014-03-06 04:42:37 -07:00
|
|
|
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;
|
2012-02-08 07:37:14 -07:00
|
|
|
}
|
|
|
|
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);
|
|
|
|
|
2012-02-03 05:34:14 -07:00
|
|
|
/* Chip-supported device locking */
|
|
|
|
int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
|
|
|
|
{
|
|
|
|
if (!mtd->_lock)
|
|
|
|
return -EOPNOTSUPP;
|
2014-07-21 20:06:27 -06:00
|
|
|
if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs)
|
2012-02-03 05:34:14 -07:00
|
|
|
return -EINVAL;
|
2012-02-06 04:27:43 -07:00
|
|
|
if (!len)
|
|
|
|
return 0;
|
2012-02-03 05:34:14 -07:00
|
|
|
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;
|
2014-07-21 20:06:27 -06:00
|
|
|
if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs)
|
2012-02-03 05:34:14 -07:00
|
|
|
return -EINVAL;
|
2012-02-06 04:27:43 -07:00
|
|
|
if (!len)
|
|
|
|
return 0;
|
2012-02-03 05:34:14 -07:00
|
|
|
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;
|
2014-07-21 20:06:27 -06:00
|
|
|
if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs)
|
2012-02-03 05:34:14 -07:00
|
|
|
return -EINVAL;
|
2012-02-06 04:27:43 -07:00
|
|
|
if (!len)
|
|
|
|
return 0;
|
2012-02-03 05:34:14 -07:00
|
|
|
return mtd->_is_locked(mtd, ofs, len);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(mtd_is_locked);
|
|
|
|
|
2014-05-21 16:06:12 -06:00
|
|
|
int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs)
|
2012-02-03 05:34:14 -07:00
|
|
|
{
|
2014-07-21 20:06:27 -06:00
|
|
|
if (ofs < 0 || ofs >= mtd->size)
|
2014-05-21 16:06:12 -06:00
|
|
|
return -EINVAL;
|
|
|
|
if (!mtd->_block_isreserved)
|
2012-02-03 05:34:14 -07:00
|
|
|
return 0;
|
2014-05-21 16:06:12 -06:00
|
|
|
return mtd->_block_isreserved(mtd, ofs);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(mtd_block_isreserved);
|
|
|
|
|
|
|
|
int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs)
|
|
|
|
{
|
2014-07-21 20:06:27 -06:00
|
|
|
if (ofs < 0 || ofs >= mtd->size)
|
2012-02-03 05:34:14 -07:00
|
|
|
return -EINVAL;
|
2014-05-21 16:06:12 -06:00
|
|
|
if (!mtd->_block_isbad)
|
|
|
|
return 0;
|
2012-02-03 05:34:14 -07:00
|
|
|
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;
|
2014-07-21 20:06:27 -06:00
|
|
|
if (ofs < 0 || ofs >= mtd->size)
|
2012-02-03 05:34:14 -07:00
|
|
|
return -EINVAL;
|
2012-02-03 09:13:23 -07:00
|
|
|
if (!(mtd->flags & MTD_WRITEABLE))
|
|
|
|
return -EROFS;
|
2012-02-03 05:34:14 -07:00
|
|
|
return mtd->_block_markbad(mtd, ofs);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(mtd_block_markbad);
|
|
|
|
|
2011-12-30 06:57:25 -07:00
|
|
|
/*
|
|
|
|
* 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.
|
2005-04-16 16:20:36 -06:00
|
|
|
*/
|
2011-12-30 07:23:41 -07:00
|
|
|
static int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
|
|
|
|
unsigned long count, loff_t to, size_t *retlen)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
unsigned long i;
|
|
|
|
size_t totlen = 0, thislen;
|
|
|
|
int ret = 0;
|
|
|
|
|
2011-12-30 06:57:25 -07:00
|
|
|
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;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
2011-12-30 06:57:25 -07:00
|
|
|
*retlen = totlen;
|
2005-04-16 16:20:36 -06:00
|
|
|
return ret;
|
|
|
|
}
|
2011-12-30 07:23:41 -07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* 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;
|
2012-02-03 09:13:23 -07:00
|
|
|
if (!(mtd->flags & MTD_WRITEABLE))
|
|
|
|
return -EROFS;
|
2012-01-30 05:58:32 -07:00
|
|
|
if (!mtd->_writev)
|
2011-12-30 07:23:41 -07:00
|
|
|
return default_mtd_writev(mtd, vecs, count, to, retlen);
|
2012-01-30 05:58:32 -07:00
|
|
|
return mtd->_writev(mtd, vecs, count, to, retlen);
|
2011-12-30 07:23:41 -07:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(mtd_writev);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
mtd: create function to perform large allocations
Introduce a common function to handle large, contiguous kmalloc buffer
allocations by exponentially backing off on the size of the requested
kernel transfer buffer until it succeeds or until the requested
transfer buffer size falls below the page size.
This helps ensure the operation can succeed under low-memory, highly-
fragmented situations albeit somewhat more slowly.
Artem: so this patch solves the problem that the kernel tries to kmalloc too
large buffers, which (a) may fail and does fail - people complain about this,
and (b) slows down the system in case of high memory fragmentation, because
the kernel starts dropping caches, writing back, swapping, etc. But we do not
really have to allocate a lot of memory to do the I/O, we may do this even with
as little as one min. I/O unit (NAND page) of RAM. So the idea of this patch is
that if the user asks to read or write a lot, we try to kmalloc a lot, with GFP
flags which make the kernel _not_ drop caches, etc. If we can allocate it - good,
if not - we try to allocate twice as less, and so on, until we reach the min.
I/O unit size, which is our last resort allocation and use the normal
GFP_KERNEL flag.
Artem: re-write the allocation function so that it makes sure the allocated
buffer is aligned to the min. I/O size of the flash.
Signed-off-by: Grant Erickson <marathon96@gmail.com>
Tested-by: Ben Gardiner <bengardiner@nanometrics.ca>
Tested-by: Stefano Babic <sbabic@denx.de>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2011-04-08 09:51:32 -06:00
|
|
|
/**
|
|
|
|
* mtd_kmalloc_up_to - allocate a contiguous buffer up to the specified size
|
2011-12-30 06:57:25 -07:00
|
|
|
* @mtd: mtd device description object pointer
|
|
|
|
* @size: a pointer to the ideal or maximum size of the allocation, points
|
mtd: create function to perform large allocations
Introduce a common function to handle large, contiguous kmalloc buffer
allocations by exponentially backing off on the size of the requested
kernel transfer buffer until it succeeds or until the requested
transfer buffer size falls below the page size.
This helps ensure the operation can succeed under low-memory, highly-
fragmented situations albeit somewhat more slowly.
Artem: so this patch solves the problem that the kernel tries to kmalloc too
large buffers, which (a) may fail and does fail - people complain about this,
and (b) slows down the system in case of high memory fragmentation, because
the kernel starts dropping caches, writing back, swapping, etc. But we do not
really have to allocate a lot of memory to do the I/O, we may do this even with
as little as one min. I/O unit (NAND page) of RAM. So the idea of this patch is
that if the user asks to read or write a lot, we try to kmalloc a lot, with GFP
flags which make the kernel _not_ drop caches, etc. If we can allocate it - good,
if not - we try to allocate twice as less, and so on, until we reach the min.
I/O unit size, which is our last resort allocation and use the normal
GFP_KERNEL flag.
Artem: re-write the allocation function so that it makes sure the allocated
buffer is aligned to the min. I/O size of the flash.
Signed-off-by: Grant Erickson <marathon96@gmail.com>
Tested-by: Ben Gardiner <bengardiner@nanometrics.ca>
Tested-by: Stefano Babic <sbabic@denx.de>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2011-04-08 09:51:32 -06:00
|
|
|
* 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
|
Revert "revert "Revert "mm: remove __GFP_NO_KSWAPD""" and associated damage
This reverts commits a50915394f1fc02c2861d3b7ce7014788aa5066e and
d7c3b937bdf45f0b844400b7bf6fd3ed50bac604.
This is a revert of a revert of a revert. In addition, it reverts the
even older i915 change to stop using the __GFP_NO_KSWAPD flag due to the
original commits in linux-next.
It turns out that the original patch really was bogus, and that the
original revert was the correct thing to do after all. We thought we
had fixed the problem, and then reverted the revert, but the problem
really is fundamental: waking up kswapd simply isn't the right thing to
do, and direct reclaim sometimes simply _is_ the right thing to do.
When certain allocations fail, we simply should try some direct reclaim,
and if that fails, fail the allocation. That's the right thing to do
for THP allocations, which can easily fail, and the GPU allocations want
to do that too.
So starting kswapd is sometimes simply wrong, and removing the flag that
said "don't start kswapd" was a mistake. Let's hope we never revisit
this mistake again - and certainly not this many times ;)
Acked-by: Mel Gorman <mgorman@suse.de>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-12-10 11:51:16 -07:00
|
|
|
* ask the memory allocator to avoid re-trying, swapping, writing back
|
|
|
|
* or performing I/O.
|
mtd: create function to perform large allocations
Introduce a common function to handle large, contiguous kmalloc buffer
allocations by exponentially backing off on the size of the requested
kernel transfer buffer until it succeeds or until the requested
transfer buffer size falls below the page size.
This helps ensure the operation can succeed under low-memory, highly-
fragmented situations albeit somewhat more slowly.
Artem: so this patch solves the problem that the kernel tries to kmalloc too
large buffers, which (a) may fail and does fail - people complain about this,
and (b) slows down the system in case of high memory fragmentation, because
the kernel starts dropping caches, writing back, swapping, etc. But we do not
really have to allocate a lot of memory to do the I/O, we may do this even with
as little as one min. I/O unit (NAND page) of RAM. So the idea of this patch is
that if the user asks to read or write a lot, we try to kmalloc a lot, with GFP
flags which make the kernel _not_ drop caches, etc. If we can allocate it - good,
if not - we try to allocate twice as less, and so on, until we reach the min.
I/O unit size, which is our last resort allocation and use the normal
GFP_KERNEL flag.
Artem: re-write the allocation function so that it makes sure the allocated
buffer is aligned to the min. I/O size of the flash.
Signed-off-by: Grant Erickson <marathon96@gmail.com>
Tested-by: Ben Gardiner <bengardiner@nanometrics.ca>
Tested-by: Stefano Babic <sbabic@denx.de>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2011-04-08 09:51:32 -06:00
|
|
|
*
|
|
|
|
* 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)
|
|
|
|
{
|
2015-11-06 17:28:21 -07:00
|
|
|
gfp_t flags = __GFP_NOWARN | __GFP_DIRECT_RECLAIM | __GFP_NORETRY;
|
mtd: create function to perform large allocations
Introduce a common function to handle large, contiguous kmalloc buffer
allocations by exponentially backing off on the size of the requested
kernel transfer buffer until it succeeds or until the requested
transfer buffer size falls below the page size.
This helps ensure the operation can succeed under low-memory, highly-
fragmented situations albeit somewhat more slowly.
Artem: so this patch solves the problem that the kernel tries to kmalloc too
large buffers, which (a) may fail and does fail - people complain about this,
and (b) slows down the system in case of high memory fragmentation, because
the kernel starts dropping caches, writing back, swapping, etc. But we do not
really have to allocate a lot of memory to do the I/O, we may do this even with
as little as one min. I/O unit (NAND page) of RAM. So the idea of this patch is
that if the user asks to read or write a lot, we try to kmalloc a lot, with GFP
flags which make the kernel _not_ drop caches, etc. If we can allocate it - good,
if not - we try to allocate twice as less, and so on, until we reach the min.
I/O unit size, which is our last resort allocation and use the normal
GFP_KERNEL flag.
Artem: re-write the allocation function so that it makes sure the allocated
buffer is aligned to the min. I/O size of the flash.
Signed-off-by: Grant Erickson <marathon96@gmail.com>
Tested-by: Ben Gardiner <bengardiner@nanometrics.ca>
Tested-by: Stefano Babic <sbabic@denx.de>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2011-04-08 09:51:32 -06:00
|
|
|
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);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(mtd_kmalloc_up_to);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2006-03-31 03:29:49 -07:00
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/*====================================================================*/
|
|
|
|
/* Support for /proc/mtd */
|
|
|
|
|
2011-05-13 14:34:19 -06:00
|
|
|
static int mtd_proc_show(struct seq_file *m, void *v)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2010-01-29 13:57:11 -07:00
|
|
|
struct mtd_info *mtd;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2011-05-13 14:34:19 -06:00
|
|
|
seq_puts(m, "dev: size erasesize name\n");
|
2006-03-31 03:29:41 -07:00
|
|
|
mutex_lock(&mtd_table_mutex);
|
2010-01-29 13:57:11 -07:00
|
|
|
mtd_for_each_device(mtd) {
|
2011-05-13 14:34:19 -06:00
|
|
|
seq_printf(m, "mtd%d: %8.8llx %8.8x \"%s\"\n",
|
|
|
|
mtd->index, (unsigned long long)mtd->size,
|
|
|
|
mtd->erasesize, mtd->name);
|
2011-05-20 07:14:30 -06:00
|
|
|
}
|
2006-03-31 03:29:41 -07:00
|
|
|
mutex_unlock(&mtd_table_mutex);
|
2011-05-20 07:14:30 -06:00
|
|
|
return 0;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2011-05-13 14:34:19 -06:00
|
|
|
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,
|
|
|
|
};
|
2009-04-04 12:03:04 -06:00
|
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/*====================================================================*/
|
|
|
|
/* Init code */
|
|
|
|
|
2016-08-04 08:01:15 -06:00
|
|
|
static struct backing_dev_info * __init mtd_bdi_init(char *name)
|
2010-04-27 01:49:47 -06:00
|
|
|
{
|
2016-08-04 08:01:15 -06:00
|
|
|
struct backing_dev_info *bdi;
|
2010-04-27 01:49:47 -06:00
|
|
|
int ret;
|
|
|
|
|
2016-08-04 08:01:15 -06:00
|
|
|
bdi = kzalloc(sizeof(*bdi), GFP_KERNEL);
|
|
|
|
if (!bdi)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
2010-04-27 01:49:47 -06:00
|
|
|
|
2016-08-04 08:01:15 -06:00
|
|
|
ret = bdi_setup_and_register(bdi, name);
|
2010-04-27 01:49:47 -06:00
|
|
|
if (ret)
|
2016-08-04 08:01:15 -06:00
|
|
|
kfree(bdi);
|
2010-04-27 01:49:47 -06:00
|
|
|
|
2016-08-04 08:01:15 -06:00
|
|
|
return ret ? ERR_PTR(ret) : bdi;
|
2010-04-27 01:49:47 -06:00
|
|
|
}
|
|
|
|
|
2013-03-15 04:56:05 -06:00
|
|
|
static struct proc_dir_entry *proc_mtd;
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
static int __init init_mtd(void)
|
|
|
|
{
|
2009-04-05 08:40:58 -06:00
|
|
|
int ret;
|
2010-04-27 01:49:47 -06:00
|
|
|
|
2009-04-05 08:40:58 -06:00
|
|
|
ret = class_register(&mtd_class);
|
2010-04-27 01:49:47 -06:00
|
|
|
if (ret)
|
|
|
|
goto err_reg;
|
|
|
|
|
2016-08-04 08:01:15 -06:00
|
|
|
mtd_bdi = mtd_bdi_init("mtd");
|
|
|
|
if (IS_ERR(mtd_bdi)) {
|
|
|
|
ret = PTR_ERR(mtd_bdi);
|
2015-01-14 02:42:32 -07:00
|
|
|
goto err_bdi;
|
2016-08-04 08:01:15 -06:00
|
|
|
}
|
2009-04-03 14:00:45 -06:00
|
|
|
|
2011-05-13 14:34:19 -06:00
|
|
|
proc_mtd = proc_create("mtd", 0, NULL, &mtd_proc_ops);
|
2013-03-15 04:56:05 -06:00
|
|
|
|
mtd: merge mtdchar module with mtdcore
The MTD subsystem has historically tried to be as configurable as possible. The
side-effect of this is that its configuration menu is rather large, and we are
gradually shrinking it. For example, we recently merged partitions support with
the mtdcore.
This patch does the next step - it merges the mtdchar module to mtdcore. And in
this case this is not only about eliminating too fine-grained separation and
simplifying the configuration menu. This is also about eliminating seemingly
useless kernel module.
Indeed, mtdchar is a module that allows user-space making use of MTD devices
via /dev/mtd* character devices. If users do not enable it, they simply cannot
use MTD devices at all. They cannot read or write the flash contents. Is it a
sane and useful setup? I believe not. And everyone just enables mtdchar.
Having mtdchar separate is also a little bit harmful. People sometimes miss the
fact that they need to enable an additional configuration option to have
user-space MTD interfaces, and then they wonder why on earth the kernel does
not allow using the flash? They spend time asking around.
Thus, let's just get rid of this module and make it part of mtd core.
Note, mtdchar had additional configuration option to enable OTP interfaces,
which are present on some flashes. I removed that option as well - it saves a
really tiny amount space.
[dwmw2: Strictly speaking, you can mount file systems on MTD devices just
fine without the mtdchar (or mtdblock) devices; you just can't do
other manipulations directly on the underlying device. But still I
agree that it makes sense to make this unconditional. And Yay! we
get to kill off an instance of checking CONFIG_foo_MODULE, which is
an abomination that should never happen.]
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2013-03-14 05:27:40 -06:00
|
|
|
ret = init_mtdchar();
|
|
|
|
if (ret)
|
|
|
|
goto out_procfs;
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
return 0;
|
2010-04-27 01:49:47 -06:00
|
|
|
|
mtd: merge mtdchar module with mtdcore
The MTD subsystem has historically tried to be as configurable as possible. The
side-effect of this is that its configuration menu is rather large, and we are
gradually shrinking it. For example, we recently merged partitions support with
the mtdcore.
This patch does the next step - it merges the mtdchar module to mtdcore. And in
this case this is not only about eliminating too fine-grained separation and
simplifying the configuration menu. This is also about eliminating seemingly
useless kernel module.
Indeed, mtdchar is a module that allows user-space making use of MTD devices
via /dev/mtd* character devices. If users do not enable it, they simply cannot
use MTD devices at all. They cannot read or write the flash contents. Is it a
sane and useful setup? I believe not. And everyone just enables mtdchar.
Having mtdchar separate is also a little bit harmful. People sometimes miss the
fact that they need to enable an additional configuration option to have
user-space MTD interfaces, and then they wonder why on earth the kernel does
not allow using the flash? They spend time asking around.
Thus, let's just get rid of this module and make it part of mtd core.
Note, mtdchar had additional configuration option to enable OTP interfaces,
which are present on some flashes. I removed that option as well - it saves a
really tiny amount space.
[dwmw2: Strictly speaking, you can mount file systems on MTD devices just
fine without the mtdchar (or mtdblock) devices; you just can't do
other manipulations directly on the underlying device. But still I
agree that it makes sense to make this unconditional. And Yay! we
get to kill off an instance of checking CONFIG_foo_MODULE, which is
an abomination that should never happen.]
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2013-03-14 05:27:40 -06:00
|
|
|
out_procfs:
|
|
|
|
if (proc_mtd)
|
|
|
|
remove_proc_entry("mtd", NULL);
|
2016-08-04 08:01:15 -06:00
|
|
|
bdi_destroy(mtd_bdi);
|
|
|
|
kfree(mtd_bdi);
|
2015-01-14 02:42:32 -07:00
|
|
|
err_bdi:
|
2010-04-27 01:49:47 -06:00
|
|
|
class_unregister(&mtd_class);
|
|
|
|
err_reg:
|
|
|
|
pr_err("Error registering mtd class or bdi: %d\n", ret);
|
|
|
|
return ret;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit cleanup_mtd(void)
|
|
|
|
{
|
mtd: merge mtdchar module with mtdcore
The MTD subsystem has historically tried to be as configurable as possible. The
side-effect of this is that its configuration menu is rather large, and we are
gradually shrinking it. For example, we recently merged partitions support with
the mtdcore.
This patch does the next step - it merges the mtdchar module to mtdcore. And in
this case this is not only about eliminating too fine-grained separation and
simplifying the configuration menu. This is also about eliminating seemingly
useless kernel module.
Indeed, mtdchar is a module that allows user-space making use of MTD devices
via /dev/mtd* character devices. If users do not enable it, they simply cannot
use MTD devices at all. They cannot read or write the flash contents. Is it a
sane and useful setup? I believe not. And everyone just enables mtdchar.
Having mtdchar separate is also a little bit harmful. People sometimes miss the
fact that they need to enable an additional configuration option to have
user-space MTD interfaces, and then they wonder why on earth the kernel does
not allow using the flash? They spend time asking around.
Thus, let's just get rid of this module and make it part of mtd core.
Note, mtdchar had additional configuration option to enable OTP interfaces,
which are present on some flashes. I removed that option as well - it saves a
really tiny amount space.
[dwmw2: Strictly speaking, you can mount file systems on MTD devices just
fine without the mtdchar (or mtdblock) devices; you just can't do
other manipulations directly on the underlying device. But still I
agree that it makes sense to make this unconditional. And Yay! we
get to kill off an instance of checking CONFIG_foo_MODULE, which is
an abomination that should never happen.]
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2013-03-14 05:27:40 -06:00
|
|
|
cleanup_mtdchar();
|
2011-05-20 07:14:30 -06:00
|
|
|
if (proc_mtd)
|
2013-03-15 04:56:05 -06:00
|
|
|
remove_proc_entry("mtd", NULL);
|
2009-04-05 08:40:58 -06:00
|
|
|
class_unregister(&mtd_class);
|
2016-08-04 08:01:15 -06:00
|
|
|
bdi_destroy(mtd_bdi);
|
|
|
|
kfree(mtd_bdi);
|
2015-07-08 09:15:34 -06:00
|
|
|
idr_destroy(&mtd_idr);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
module_init(init_mtd);
|
|
|
|
module_exit(cleanup_mtd);
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
|
|
|
|
MODULE_DESCRIPTION("Core MTD registration and access routines");
|