2019-05-23 17:14:39 +08:00
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// SPDX-License-Identifier: GPL-2.0-or-later
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2005-04-17 06:20:36 +08:00
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/*
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2010-08-09 03:58:20 +08:00
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* Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
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2005-04-17 06:20:36 +08:00
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*/
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2005-11-07 07:14:42 +08:00
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#include <linux/device.h>
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#include <linux/fs.h>
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2007-08-11 04:01:06 +08:00
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#include <linux/mm.h>
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2006-10-11 19:52:47 +08:00
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#include <linux/err.h>
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2005-11-07 07:14:42 +08:00
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#include <linux/init.h>
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2005-04-17 06:20:36 +08:00
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#include <linux/kernel.h>
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#include <linux/module.h>
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2005-11-07 07:14:42 +08:00
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#include <linux/slab.h>
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#include <linux/sched.h>
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2010-06-02 20:28:52 +08:00
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#include <linux/mutex.h>
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2009-02-12 18:40:00 +08:00
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#include <linux/backing-dev.h>
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2009-04-09 13:53:13 +08:00
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#include <linux/compat.h>
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2010-05-17 21:55:47 +08:00
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#include <linux/mount.h>
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2010-09-17 18:31:42 +08:00
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#include <linux/blkpg.h>
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2012-03-24 06:01:50 +08:00
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#include <linux/magic.h>
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2013-10-14 05:05:23 +08:00
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#include <linux/major.h>
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2005-04-17 06:20:36 +08:00
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#include <linux/mtd/mtd.h>
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2010-09-17 18:31:42 +08:00
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#include <linux/mtd/partitions.h>
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2010-06-15 15:30:15 +08:00
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#include <linux/mtd/map.h>
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2005-04-17 06:20:36 +08:00
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2016-12-25 03:46:01 +08:00
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#include <linux/uaccess.h>
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2005-06-30 08:23:27 +08:00
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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 19:27:40 +08:00
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#include "mtdcore.h"
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2010-06-02 20:28:52 +08:00
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static DEFINE_MUTEX(mtd_mutex);
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2005-04-17 06:20:36 +08:00
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2005-02-09 03:12:53 +08:00
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/*
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2006-05-30 06:37:34 +08:00
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* Data structure to hold the pointer to the mtd device as well
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2011-07-21 00:53:42 +08:00
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* as mode information of various use cases.
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2005-02-09 03:12:53 +08:00
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*/
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2006-05-30 06:37:34 +08:00
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struct mtd_file_info {
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struct mtd_info *mtd;
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enum mtd_file_modes mode;
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};
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2005-02-09 01:45:55 +08:00
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2011-12-23 23:27:46 +08:00
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static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig)
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2005-04-17 06:20:36 +08:00
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{
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2006-05-30 06:37:34 +08:00
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struct mtd_file_info *mfi = file->private_data;
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2013-06-17 00:27:42 +08:00
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return fixed_size_llseek(file, offset, orig, mfi->mtd->size);
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2005-04-17 06:20:36 +08:00
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}
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2011-12-23 23:27:46 +08:00
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static int mtdchar_open(struct inode *inode, struct file *file)
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2005-04-17 06:20:36 +08:00
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{
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int minor = iminor(inode);
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int devnum = minor >> 1;
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2008-05-16 00:10:37 +08:00
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int ret = 0;
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2005-04-17 06:20:36 +08:00
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struct mtd_info *mtd;
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2006-05-30 06:37:34 +08:00
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struct mtd_file_info *mfi;
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2005-04-17 06:20:36 +08:00
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2011-07-20 01:06:09 +08:00
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pr_debug("MTD_open\n");
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2005-04-17 06:20:36 +08:00
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/* You can't open the RO devices RW */
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2008-09-03 03:28:45 +08:00
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if ((file->f_mode & FMODE_WRITE) && (minor & 1))
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2005-04-17 06:20:36 +08:00
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return -EACCES;
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2010-06-02 20:28:52 +08:00
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mutex_lock(&mtd_mutex);
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2005-04-17 06:20:36 +08:00
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mtd = get_mtd_device(NULL, devnum);
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2005-11-07 19:15:26 +08:00
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2008-05-16 00:10:37 +08:00
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if (IS_ERR(mtd)) {
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ret = PTR_ERR(mtd);
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goto out;
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}
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2005-11-07 19:15:26 +08:00
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2009-02-12 18:40:00 +08:00
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if (mtd->type == MTD_ABSENT) {
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2008-05-16 00:10:37 +08:00
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ret = -ENODEV;
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2012-04-09 13:36:28 +08:00
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goto out1;
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2005-04-17 06:20:36 +08:00
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}
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/* You can't open it RW if it's not a writeable device */
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2008-09-03 03:28:45 +08:00
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if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
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2008-05-16 00:10:37 +08:00
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ret = -EACCES;
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2015-01-14 17:42:32 +08:00
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goto out1;
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2005-04-17 06:20:36 +08:00
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}
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2005-11-07 19:15:26 +08:00
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2006-05-30 06:37:34 +08:00
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mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
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if (!mfi) {
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2008-05-16 00:10:37 +08:00
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ret = -ENOMEM;
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2015-01-14 17:42:32 +08:00
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goto out1;
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2006-05-30 06:37:34 +08:00
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}
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mfi->mtd = mtd;
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file->private_data = mfi;
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2012-04-09 13:36:28 +08:00
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mutex_unlock(&mtd_mutex);
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return 0;
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2006-05-30 06:37:34 +08:00
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2012-04-09 13:36:28 +08:00
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out1:
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put_mtd_device(mtd);
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2008-05-16 00:10:37 +08:00
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out:
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2010-06-02 20:28:52 +08:00
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mutex_unlock(&mtd_mutex);
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2008-05-16 00:10:37 +08:00
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return ret;
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2011-12-23 23:27:46 +08:00
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} /* mtdchar_open */
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2005-04-17 06:20:36 +08:00
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/*====================================================================*/
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2011-12-23 23:27:46 +08:00
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static int mtdchar_close(struct inode *inode, struct file *file)
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2005-04-17 06:20:36 +08:00
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{
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2006-05-30 06:37:34 +08:00
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struct mtd_file_info *mfi = file->private_data;
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struct mtd_info *mtd = mfi->mtd;
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2005-04-17 06:20:36 +08:00
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2011-07-20 01:06:09 +08:00
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pr_debug("MTD_close\n");
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2005-04-17 06:20:36 +08:00
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2007-06-27 06:56:40 +08:00
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/* Only sync if opened RW */
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2011-12-30 22:35:35 +08:00
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if ((file->f_mode & FMODE_WRITE))
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2011-12-24 01:03:12 +08:00
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mtd_sync(mtd);
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2005-11-07 19:15:26 +08:00
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2005-04-17 06:20:36 +08:00
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put_mtd_device(mtd);
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2006-05-30 06:37:34 +08:00
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file->private_data = NULL;
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kfree(mfi);
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2005-04-17 06:20:36 +08:00
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return 0;
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2011-12-23 23:27:46 +08:00
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} /* mtdchar_close */
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2005-04-17 06:20:36 +08:00
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2011-04-08 23:51:33 +08:00
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/* Back in June 2001, dwmw2 wrote:
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*
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* FIXME: This _really_ needs to die. In 2.5, we should lock the
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* userspace buffer down and use it directly with readv/writev.
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*
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* The implementation below, using mtd_kmalloc_up_to, mitigates
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* allocation failures when the system is under low-memory situations
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* or if memory is highly fragmented at the cost of reducing the
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* performance of the requested transfer due to a smaller buffer size.
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*
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* A more complex but more memory-efficient implementation based on
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* get_user_pages and iovecs to cover extents of those pages is a
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* longer-term goal, as intimated by dwmw2 above. However, for the
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* write case, this requires yet more complex head and tail transfer
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* handling when those head and tail offsets and sizes are such that
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* alignment requirements are not met in the NAND subdriver.
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*/
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2005-04-17 06:20:36 +08:00
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2011-12-23 23:27:46 +08:00
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static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
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loff_t *ppos)
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2005-04-17 06:20:36 +08:00
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{
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2006-05-30 06:37:34 +08:00
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struct mtd_file_info *mfi = file->private_data;
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struct mtd_info *mtd = mfi->mtd;
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mtd: remove extra retlen assignment
MTD functions always assign the 'retlen' argument to 0 at the very
beginning - the callers do not have to do this.
I used the following semantic patch to find these places:
@@
identifier retlen;
expression a, b, c, d, e;
constant C;
type T;
@@
(
- retlen = C;
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T
-retlen = C
+ retlen
;
)
... when != retlen
when exists
(
mtd_read(a, b, c, &retlen, d)
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mtd_write(a, b, c, &retlen, d)
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mtd_panic_write(a, b, c, &retlen, d)
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mtd_point(a, b, c, &retlen, d, e)
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mtd_read_fact_prot_reg(a, b, c, &retlen, d)
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mtd_write_user_prot_reg(a, b, c, &retlen, d)
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mtd_read_user_prot_reg(a, b, c, &retlen, d)
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mtd_writev(a, b, c, d, &retlen)
)
I ran it twice, because there were cases of double zero assigments
in mtd tests. Then I went through the patch to verify that spatch
did not find any false positives.
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2011-12-29 21:16:28 +08:00
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size_t retlen;
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2005-04-17 06:20:36 +08:00
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size_t total_retlen=0;
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int ret=0;
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int len;
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2011-04-08 23:51:33 +08:00
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size_t size = count;
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2005-04-17 06:20:36 +08:00
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char *kbuf;
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2005-11-07 19:15:26 +08:00
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2011-07-20 01:06:09 +08:00
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pr_debug("MTD_read\n");
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2005-04-17 06:20:36 +08:00
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2018-07-07 11:37:22 +08:00
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if (*ppos + count > mtd->size) {
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if (*ppos < mtd->size)
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count = mtd->size - *ppos;
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else
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count = 0;
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}
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2005-04-17 06:20:36 +08:00
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if (!count)
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return 0;
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2005-11-07 19:15:26 +08:00
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2011-04-08 23:51:33 +08:00
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kbuf = mtd_kmalloc_up_to(mtd, &size);
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2006-04-18 00:38:15 +08:00
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if (!kbuf)
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return -ENOMEM;
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2005-04-17 06:20:36 +08:00
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while (count) {
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2011-04-08 23:51:33 +08:00
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len = min_t(size_t, count, size);
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2005-04-17 06:20:36 +08:00
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2006-05-30 06:37:34 +08:00
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switch (mfi->mode) {
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2011-08-31 09:45:41 +08:00
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case MTD_FILE_MODE_OTP_FACTORY:
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2011-12-24 00:40:06 +08:00
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ret = mtd_read_fact_prot_reg(mtd, *ppos, len,
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&retlen, kbuf);
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2005-02-09 01:45:55 +08:00
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break;
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2011-08-31 09:45:41 +08:00
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case MTD_FILE_MODE_OTP_USER:
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2011-12-24 00:47:59 +08:00
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ret = mtd_read_user_prot_reg(mtd, *ppos, len,
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&retlen, kbuf);
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2005-02-09 01:45:55 +08:00
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break;
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2011-08-31 09:45:41 +08:00
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case MTD_FILE_MODE_RAW:
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2006-05-30 06:37:34 +08:00
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{
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2019-09-20 03:06:21 +08:00
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struct mtd_oob_ops ops = {};
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2006-05-30 06:37:34 +08:00
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2011-08-31 09:45:40 +08:00
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ops.mode = MTD_OPS_RAW;
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2006-05-30 06:37:34 +08:00
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ops.datbuf = kbuf;
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ops.oobbuf = NULL;
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ops.len = len;
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2011-12-24 00:27:05 +08:00
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ret = mtd_read_oob(mtd, *ppos, &ops);
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2006-05-30 06:37:34 +08:00
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retlen = ops.retlen;
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break;
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}
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2005-02-09 01:45:55 +08:00
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default:
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2011-12-23 23:30:16 +08:00
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ret = mtd_read(mtd, *ppos, len, &retlen, kbuf);
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2005-02-09 01:45:55 +08:00
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}
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2011-06-24 05:12:08 +08:00
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/* Nand returns -EBADMSG on ECC errors, but it returns
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2005-04-17 06:20:36 +08:00
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* the data. For our userspace tools it is important
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2011-06-24 05:12:08 +08:00
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* to dump areas with ECC errors!
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2006-05-29 20:56:39 +08:00
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* For kernel internal usage it also might return -EUCLEAN
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2011-03-31 09:57:33 +08:00
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* to signal the caller that a bitflip has occurred and has
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2006-05-29 20:56:39 +08:00
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* been corrected by the ECC algorithm.
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2005-04-17 06:20:36 +08:00
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* Userspace software which accesses NAND this way
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* must be aware of the fact that it deals with NAND
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*/
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2011-09-21 09:34:25 +08:00
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if (!ret || mtd_is_bitflip_or_eccerr(ret)) {
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2005-04-17 06:20:36 +08:00
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*ppos += retlen;
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if (copy_to_user(buf, kbuf, retlen)) {
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2006-05-28 17:01:53 +08:00
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kfree(kbuf);
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2005-04-17 06:20:36 +08:00
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return -EFAULT;
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}
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else
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total_retlen += retlen;
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count -= retlen;
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buf += retlen;
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2005-02-09 01:45:55 +08:00
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if (retlen == 0)
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count = 0;
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2005-04-17 06:20:36 +08:00
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}
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else {
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kfree(kbuf);
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return ret;
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}
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2005-11-07 19:15:26 +08:00
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2005-04-17 06:20:36 +08:00
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}
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2006-04-18 00:38:15 +08:00
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kfree(kbuf);
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2005-04-17 06:20:36 +08:00
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return total_retlen;
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2011-12-23 23:27:46 +08:00
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} /* mtdchar_read */
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2005-04-17 06:20:36 +08:00
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2011-12-23 23:27:46 +08:00
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static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count,
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loff_t *ppos)
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2005-04-17 06:20:36 +08:00
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{
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2006-05-30 06:37:34 +08:00
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struct mtd_file_info *mfi = file->private_data;
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|
|
struct mtd_info *mtd = mfi->mtd;
|
2011-04-08 23:51:33 +08:00
|
|
|
size_t size = count;
|
2005-04-17 06:20:36 +08:00
|
|
|
char *kbuf;
|
|
|
|
size_t retlen;
|
|
|
|
size_t total_retlen=0;
|
|
|
|
int ret=0;
|
|
|
|
int len;
|
|
|
|
|
2011-07-20 01:06:09 +08:00
|
|
|
pr_debug("MTD_write\n");
|
2005-11-07 19:15:26 +08:00
|
|
|
|
2018-07-07 11:37:22 +08:00
|
|
|
if (*ppos >= mtd->size)
|
2005-04-17 06:20:36 +08:00
|
|
|
return -ENOSPC;
|
2005-11-07 19:15:26 +08:00
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
if (*ppos + count > mtd->size)
|
|
|
|
count = mtd->size - *ppos;
|
|
|
|
|
|
|
|
if (!count)
|
|
|
|
return 0;
|
|
|
|
|
2011-04-08 23:51:33 +08:00
|
|
|
kbuf = mtd_kmalloc_up_to(mtd, &size);
|
2006-04-18 00:38:15 +08:00
|
|
|
if (!kbuf)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
while (count) {
|
2011-04-08 23:51:33 +08:00
|
|
|
len = min_t(size_t, count, size);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
if (copy_from_user(kbuf, buf, len)) {
|
|
|
|
kfree(kbuf);
|
|
|
|
return -EFAULT;
|
|
|
|
}
|
2005-11-07 19:15:26 +08:00
|
|
|
|
2006-05-30 06:37:34 +08:00
|
|
|
switch (mfi->mode) {
|
2011-08-31 09:45:41 +08:00
|
|
|
case MTD_FILE_MODE_OTP_FACTORY:
|
2005-02-09 01:45:55 +08:00
|
|
|
ret = -EROFS;
|
|
|
|
break;
|
2011-08-31 09:45:41 +08:00
|
|
|
case MTD_FILE_MODE_OTP_USER:
|
2011-12-24 00:50:04 +08:00
|
|
|
ret = mtd_write_user_prot_reg(mtd, *ppos, len,
|
|
|
|
&retlen, kbuf);
|
2005-02-09 01:45:55 +08:00
|
|
|
break;
|
2006-05-30 06:37:34 +08:00
|
|
|
|
2011-08-31 09:45:41 +08:00
|
|
|
case MTD_FILE_MODE_RAW:
|
2006-05-30 06:37:34 +08:00
|
|
|
{
|
2019-09-20 03:06:21 +08:00
|
|
|
struct mtd_oob_ops ops = {};
|
2006-05-30 06:37:34 +08:00
|
|
|
|
2011-08-31 09:45:40 +08:00
|
|
|
ops.mode = MTD_OPS_RAW;
|
2006-05-30 06:37:34 +08:00
|
|
|
ops.datbuf = kbuf;
|
|
|
|
ops.oobbuf = NULL;
|
2011-06-06 21:50:58 +08:00
|
|
|
ops.ooboffs = 0;
|
2006-05-30 06:37:34 +08:00
|
|
|
ops.len = len;
|
|
|
|
|
2011-12-24 00:29:55 +08:00
|
|
|
ret = mtd_write_oob(mtd, *ppos, &ops);
|
2006-05-30 06:37:34 +08:00
|
|
|
retlen = ops.retlen;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2005-02-09 01:45:55 +08:00
|
|
|
default:
|
2011-12-23 23:35:41 +08:00
|
|
|
ret = mtd_write(mtd, *ppos, len, &retlen, kbuf);
|
2005-02-09 01:45:55 +08:00
|
|
|
}
|
2014-03-06 19:42:37 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Return -ENOSPC only if no data could be written at all.
|
|
|
|
* Otherwise just return the number of bytes that actually
|
|
|
|
* have been written.
|
|
|
|
*/
|
|
|
|
if ((ret == -ENOSPC) && (total_retlen))
|
|
|
|
break;
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
if (!ret) {
|
|
|
|
*ppos += retlen;
|
|
|
|
total_retlen += retlen;
|
|
|
|
count -= retlen;
|
|
|
|
buf += retlen;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
kfree(kbuf);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-04-18 00:38:15 +08:00
|
|
|
kfree(kbuf);
|
2005-04-17 06:20:36 +08:00
|
|
|
return total_retlen;
|
2011-12-23 23:27:46 +08:00
|
|
|
} /* mtdchar_write */
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
/*======================================================================
|
|
|
|
|
|
|
|
IOCTL calls for getting device parameters.
|
|
|
|
|
|
|
|
======================================================================*/
|
|
|
|
|
2006-05-30 06:37:34 +08:00
|
|
|
static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
|
|
|
|
{
|
|
|
|
struct mtd_info *mtd = mfi->mtd;
|
2011-12-29 16:06:32 +08:00
|
|
|
size_t retlen;
|
|
|
|
|
2006-05-30 06:37:34 +08:00
|
|
|
switch (mode) {
|
|
|
|
case MTD_OTP_FACTORY:
|
2013-03-05 00:35:24 +08:00
|
|
|
if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) ==
|
|
|
|
-EOPNOTSUPP)
|
|
|
|
return -EOPNOTSUPP;
|
|
|
|
|
2011-12-29 16:06:32 +08:00
|
|
|
mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
|
2006-05-30 06:37:34 +08:00
|
|
|
break;
|
|
|
|
case MTD_OTP_USER:
|
2013-03-05 00:35:24 +08:00
|
|
|
if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) ==
|
|
|
|
-EOPNOTSUPP)
|
|
|
|
return -EOPNOTSUPP;
|
|
|
|
|
2011-12-29 16:06:32 +08:00
|
|
|
mfi->mode = MTD_FILE_MODE_OTP_USER;
|
2006-05-30 06:37:34 +08:00
|
|
|
break;
|
|
|
|
case MTD_OTP_OFF:
|
2013-03-05 00:35:24 +08:00
|
|
|
mfi->mode = MTD_FILE_MODE_NORMAL;
|
2006-05-30 06:37:34 +08:00
|
|
|
break;
|
2013-03-05 00:35:24 +08:00
|
|
|
default:
|
|
|
|
return -EINVAL;
|
2006-05-30 06:37:34 +08:00
|
|
|
}
|
2013-03-05 00:35:24 +08:00
|
|
|
|
|
|
|
return 0;
|
2006-05-30 06:37:34 +08:00
|
|
|
}
|
|
|
|
|
2011-12-23 23:27:46 +08:00
|
|
|
static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
|
2009-04-09 13:53:13 +08:00
|
|
|
uint64_t start, uint32_t length, void __user *ptr,
|
|
|
|
uint32_t __user *retp)
|
|
|
|
{
|
2020-01-14 17:09:52 +08:00
|
|
|
struct mtd_info *master = mtd_get_master(mtd);
|
2011-08-31 09:45:37 +08:00
|
|
|
struct mtd_file_info *mfi = file->private_data;
|
2019-09-20 03:06:21 +08:00
|
|
|
struct mtd_oob_ops ops = {};
|
2009-04-09 13:53:13 +08:00
|
|
|
uint32_t retlen;
|
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
if (!(file->f_mode & FMODE_WRITE))
|
|
|
|
return -EPERM;
|
|
|
|
|
|
|
|
if (length > 4096)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2020-01-14 17:09:52 +08:00
|
|
|
if (!master->_write_oob)
|
2017-09-30 01:55:19 +08:00
|
|
|
return -EOPNOTSUPP;
|
2009-04-09 13:53:13 +08:00
|
|
|
|
|
|
|
ops.ooblen = length;
|
mtd: do not assume oobsize is power of 2
Previous generations of MTDs all used OOB sizes that were powers of 2,
(e.g., 64, 128). However, newer generations of flash, especially NAND,
use irregular OOB sizes that are not powers of 2 (e.g., 218, 224, 448).
This means we cannot use masks like "mtd->oobsize - 1" to assume that we
will get a proper bitmask for OOB operations.
These masks are really only intended to hide the "page" portion of the
offset, leaving any OOB offset intact, so a masking with the writesize
(which *is* always a power of 2) is valid and makes more sense.
This has been tested for read/write of NAND devices (nanddump/nandwrite)
using nandsim and actual NAND flash.
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@intel.com>
2011-08-24 08:17:32 +08:00
|
|
|
ops.ooboffs = start & (mtd->writesize - 1);
|
2009-04-09 13:53:13 +08:00
|
|
|
ops.datbuf = NULL;
|
2011-08-31 09:45:41 +08:00
|
|
|
ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
|
2011-08-31 09:45:40 +08:00
|
|
|
MTD_OPS_PLACE_OOB;
|
2009-04-09 13:53:13 +08:00
|
|
|
|
|
|
|
if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
|
|
|
|
return -EINVAL;
|
|
|
|
|
2010-05-22 16:22:49 +08:00
|
|
|
ops.oobbuf = memdup_user(ptr, length);
|
|
|
|
if (IS_ERR(ops.oobbuf))
|
|
|
|
return PTR_ERR(ops.oobbuf);
|
2009-04-09 13:53:13 +08:00
|
|
|
|
mtd: do not assume oobsize is power of 2
Previous generations of MTDs all used OOB sizes that were powers of 2,
(e.g., 64, 128). However, newer generations of flash, especially NAND,
use irregular OOB sizes that are not powers of 2 (e.g., 218, 224, 448).
This means we cannot use masks like "mtd->oobsize - 1" to assume that we
will get a proper bitmask for OOB operations.
These masks are really only intended to hide the "page" portion of the
offset, leaving any OOB offset intact, so a masking with the writesize
(which *is* always a power of 2) is valid and makes more sense.
This has been tested for read/write of NAND devices (nanddump/nandwrite)
using nandsim and actual NAND flash.
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@intel.com>
2011-08-24 08:17:32 +08:00
|
|
|
start &= ~((uint64_t)mtd->writesize - 1);
|
2011-12-24 00:29:55 +08:00
|
|
|
ret = mtd_write_oob(mtd, start, &ops);
|
2009-04-09 13:53:13 +08:00
|
|
|
|
|
|
|
if (ops.oobretlen > 0xFFFFFFFFU)
|
|
|
|
ret = -EOVERFLOW;
|
|
|
|
retlen = ops.oobretlen;
|
|
|
|
if (copy_to_user(retp, &retlen, sizeof(length)))
|
|
|
|
ret = -EFAULT;
|
|
|
|
|
|
|
|
kfree(ops.oobbuf);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2011-12-23 23:27:46 +08:00
|
|
|
static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
|
2011-08-31 09:45:38 +08:00
|
|
|
uint64_t start, uint32_t length, void __user *ptr,
|
|
|
|
uint32_t __user *retp)
|
2009-04-09 13:53:13 +08:00
|
|
|
{
|
2011-08-31 09:45:38 +08:00
|
|
|
struct mtd_file_info *mfi = file->private_data;
|
2019-09-20 03:06:21 +08:00
|
|
|
struct mtd_oob_ops ops = {};
|
2009-04-09 13:53:13 +08:00
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
if (length > 4096)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
ops.ooblen = length;
|
mtd: do not assume oobsize is power of 2
Previous generations of MTDs all used OOB sizes that were powers of 2,
(e.g., 64, 128). However, newer generations of flash, especially NAND,
use irregular OOB sizes that are not powers of 2 (e.g., 218, 224, 448).
This means we cannot use masks like "mtd->oobsize - 1" to assume that we
will get a proper bitmask for OOB operations.
These masks are really only intended to hide the "page" portion of the
offset, leaving any OOB offset intact, so a masking with the writesize
(which *is* always a power of 2) is valid and makes more sense.
This has been tested for read/write of NAND devices (nanddump/nandwrite)
using nandsim and actual NAND flash.
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@intel.com>
2011-08-24 08:17:32 +08:00
|
|
|
ops.ooboffs = start & (mtd->writesize - 1);
|
2009-04-09 13:53:13 +08:00
|
|
|
ops.datbuf = NULL;
|
2011-08-31 09:45:41 +08:00
|
|
|
ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
|
2011-08-31 09:45:40 +08:00
|
|
|
MTD_OPS_PLACE_OOB;
|
2009-04-09 13:53:13 +08:00
|
|
|
|
|
|
|
if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
ops.oobbuf = kmalloc(length, GFP_KERNEL);
|
|
|
|
if (!ops.oobbuf)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
mtd: do not assume oobsize is power of 2
Previous generations of MTDs all used OOB sizes that were powers of 2,
(e.g., 64, 128). However, newer generations of flash, especially NAND,
use irregular OOB sizes that are not powers of 2 (e.g., 218, 224, 448).
This means we cannot use masks like "mtd->oobsize - 1" to assume that we
will get a proper bitmask for OOB operations.
These masks are really only intended to hide the "page" portion of the
offset, leaving any OOB offset intact, so a masking with the writesize
(which *is* always a power of 2) is valid and makes more sense.
This has been tested for read/write of NAND devices (nanddump/nandwrite)
using nandsim and actual NAND flash.
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@intel.com>
2011-08-24 08:17:32 +08:00
|
|
|
start &= ~((uint64_t)mtd->writesize - 1);
|
2011-12-24 00:27:05 +08:00
|
|
|
ret = mtd_read_oob(mtd, start, &ops);
|
2009-04-09 13:53:13 +08:00
|
|
|
|
|
|
|
if (put_user(ops.oobretlen, retp))
|
|
|
|
ret = -EFAULT;
|
|
|
|
else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
|
|
|
|
ops.oobretlen))
|
|
|
|
ret = -EFAULT;
|
|
|
|
|
|
|
|
kfree(ops.oobbuf);
|
2011-06-24 07:45:24 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* NAND returns -EBADMSG on ECC errors, but it returns the OOB
|
|
|
|
* data. For our userspace tools it is important to dump areas
|
|
|
|
* with ECC errors!
|
|
|
|
* For kernel internal usage it also might return -EUCLEAN
|
2017-01-27 09:36:38 +08:00
|
|
|
* to signal the caller that a bitflip has occurred and has
|
2011-06-24 07:45:24 +08:00
|
|
|
* been corrected by the ECC algorithm.
|
|
|
|
*
|
2011-06-29 07:29:00 +08:00
|
|
|
* Note: currently the standard NAND function, nand_read_oob_std,
|
|
|
|
* does not calculate ECC for the OOB area, so do not rely on
|
|
|
|
* this behavior unless you have replaced it with your own.
|
2011-06-24 07:45:24 +08:00
|
|
|
*/
|
2011-09-21 09:34:25 +08:00
|
|
|
if (mtd_is_bitflip_or_eccerr(ret))
|
2011-06-24 07:45:24 +08:00
|
|
|
return 0;
|
|
|
|
|
2009-04-09 13:53:13 +08:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2010-08-25 09:12:00 +08:00
|
|
|
/*
|
2016-02-04 17:16:18 +08:00
|
|
|
* Copies (and truncates, if necessary) OOB layout information to the
|
|
|
|
* deprecated layout struct, nand_ecclayout_user. This is necessary only to
|
|
|
|
* support the deprecated API ioctl ECCGETLAYOUT while allowing all new
|
|
|
|
* functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops
|
|
|
|
* can describe any kind of OOB layout with almost zero overhead from a
|
|
|
|
* memory usage point of view).
|
2010-08-25 09:12:00 +08:00
|
|
|
*/
|
2016-02-04 03:10:30 +08:00
|
|
|
static int shrink_ecclayout(struct mtd_info *mtd,
|
|
|
|
struct nand_ecclayout_user *to)
|
2010-08-25 09:12:00 +08:00
|
|
|
{
|
2016-02-04 03:10:30 +08:00
|
|
|
struct mtd_oob_region oobregion;
|
|
|
|
int i, section = 0, ret;
|
2010-08-25 09:12:00 +08:00
|
|
|
|
2016-02-04 03:10:30 +08:00
|
|
|
if (!mtd || !to)
|
2010-08-25 09:12:00 +08:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
memset(to, 0, sizeof(*to));
|
|
|
|
|
2016-02-04 03:10:30 +08:00
|
|
|
to->eccbytes = 0;
|
|
|
|
for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) {
|
|
|
|
u32 eccpos;
|
|
|
|
|
2018-03-11 15:59:07 +08:00
|
|
|
ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
|
2016-02-04 03:10:30 +08:00
|
|
|
if (ret < 0) {
|
|
|
|
if (ret != -ERANGE)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
eccpos = oobregion.offset;
|
|
|
|
for (; i < MTD_MAX_ECCPOS_ENTRIES &&
|
|
|
|
eccpos < oobregion.offset + oobregion.length; i++) {
|
|
|
|
to->eccpos[i] = eccpos++;
|
|
|
|
to->eccbytes++;
|
|
|
|
}
|
|
|
|
}
|
2010-08-25 09:12:00 +08:00
|
|
|
|
|
|
|
for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
|
2016-02-04 03:10:30 +08:00
|
|
|
ret = mtd_ooblayout_free(mtd, i, &oobregion);
|
|
|
|
if (ret < 0) {
|
|
|
|
if (ret != -ERANGE)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
to->oobfree[i].offset = oobregion.offset;
|
|
|
|
to->oobfree[i].length = oobregion.length;
|
|
|
|
to->oobavail += to->oobfree[i].length;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to)
|
|
|
|
{
|
|
|
|
struct mtd_oob_region oobregion;
|
|
|
|
int i, section = 0, ret;
|
|
|
|
|
|
|
|
if (!mtd || !to)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
memset(to, 0, sizeof(*to));
|
|
|
|
|
|
|
|
to->eccbytes = 0;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(to->eccpos);) {
|
|
|
|
u32 eccpos;
|
|
|
|
|
2018-03-11 15:59:07 +08:00
|
|
|
ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
|
2016-02-04 03:10:30 +08:00
|
|
|
if (ret < 0) {
|
|
|
|
if (ret != -ERANGE)
|
|
|
|
return ret;
|
|
|
|
|
2010-08-25 09:12:00 +08:00
|
|
|
break;
|
2016-02-04 03:10:30 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
if (oobregion.length + i > ARRAY_SIZE(to->eccpos))
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
eccpos = oobregion.offset;
|
|
|
|
for (; eccpos < oobregion.offset + oobregion.length; i++) {
|
|
|
|
to->eccpos[i] = eccpos++;
|
|
|
|
to->eccbytes++;
|
|
|
|
}
|
2010-08-25 09:12:00 +08:00
|
|
|
}
|
|
|
|
|
2016-02-04 03:10:30 +08:00
|
|
|
for (i = 0; i < 8; i++) {
|
|
|
|
ret = mtd_ooblayout_free(mtd, i, &oobregion);
|
|
|
|
if (ret < 0) {
|
|
|
|
if (ret != -ERANGE)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
to->oobfree[i][0] = oobregion.offset;
|
|
|
|
to->oobfree[i][1] = oobregion.length;
|
|
|
|
}
|
|
|
|
|
|
|
|
to->useecc = MTD_NANDECC_AUTOPLACE;
|
|
|
|
|
2010-08-25 09:12:00 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-12-23 23:27:46 +08:00
|
|
|
static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
|
2015-09-22 04:26:59 +08:00
|
|
|
struct blkpg_ioctl_arg *arg)
|
2010-09-17 18:31:42 +08:00
|
|
|
{
|
|
|
|
struct blkpg_partition p;
|
|
|
|
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
|
|
return -EPERM;
|
|
|
|
|
2015-09-22 04:26:59 +08:00
|
|
|
if (copy_from_user(&p, arg->data, sizeof(p)))
|
2010-09-17 18:31:42 +08:00
|
|
|
return -EFAULT;
|
|
|
|
|
2015-09-22 04:26:59 +08:00
|
|
|
switch (arg->op) {
|
2010-09-17 18:31:42 +08:00
|
|
|
case BLKPG_ADD_PARTITION:
|
|
|
|
|
2010-11-23 20:17:17 +08:00
|
|
|
/* Only master mtd device must be used to add partitions */
|
|
|
|
if (mtd_is_partition(mtd))
|
|
|
|
return -EINVAL;
|
|
|
|
|
2014-07-22 10:08:13 +08:00
|
|
|
/* Sanitize user input */
|
|
|
|
p.devname[BLKPG_DEVNAMELTH - 1] = '\0';
|
|
|
|
|
2010-09-17 18:31:42 +08:00
|
|
|
return mtd_add_partition(mtd, p.devname, p.start, p.length);
|
|
|
|
|
|
|
|
case BLKPG_DEL_PARTITION:
|
|
|
|
|
|
|
|
if (p.pno < 0)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
return mtd_del_partition(mtd, p.pno);
|
|
|
|
|
|
|
|
default:
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2011-12-23 23:27:46 +08:00
|
|
|
static int mtdchar_write_ioctl(struct mtd_info *mtd,
|
2011-09-10 00:59:03 +08:00
|
|
|
struct mtd_write_req __user *argp)
|
|
|
|
{
|
2020-01-14 17:09:52 +08:00
|
|
|
struct mtd_info *master = mtd_get_master(mtd);
|
2011-09-10 00:59:03 +08:00
|
|
|
struct mtd_write_req req;
|
2019-09-20 03:06:21 +08:00
|
|
|
struct mtd_oob_ops ops = {};
|
2014-05-02 02:40:54 +08:00
|
|
|
const void __user *usr_data, *usr_oob;
|
2011-09-10 00:59:03 +08:00
|
|
|
int ret;
|
|
|
|
|
2014-05-02 02:40:54 +08:00
|
|
|
if (copy_from_user(&req, argp, sizeof(req)))
|
2011-09-10 00:59:03 +08:00
|
|
|
return -EFAULT;
|
2014-05-02 02:40:54 +08:00
|
|
|
|
|
|
|
usr_data = (const void __user *)(uintptr_t)req.usr_data;
|
|
|
|
usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
|
|
|
|
|
2020-01-14 17:09:52 +08:00
|
|
|
if (!master->_write_oob)
|
2011-09-10 00:59:03 +08:00
|
|
|
return -EOPNOTSUPP;
|
|
|
|
ops.mode = req.mode;
|
|
|
|
ops.len = (size_t)req.len;
|
|
|
|
ops.ooblen = (size_t)req.ooblen;
|
|
|
|
ops.ooboffs = 0;
|
|
|
|
|
2014-05-02 02:40:54 +08:00
|
|
|
if (usr_data) {
|
2011-09-10 00:59:03 +08:00
|
|
|
ops.datbuf = memdup_user(usr_data, ops.len);
|
|
|
|
if (IS_ERR(ops.datbuf))
|
|
|
|
return PTR_ERR(ops.datbuf);
|
|
|
|
} else {
|
|
|
|
ops.datbuf = NULL;
|
|
|
|
}
|
|
|
|
|
2014-05-02 02:40:54 +08:00
|
|
|
if (usr_oob) {
|
2011-09-10 00:59:03 +08:00
|
|
|
ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
|
|
|
|
if (IS_ERR(ops.oobbuf)) {
|
|
|
|
kfree(ops.datbuf);
|
|
|
|
return PTR_ERR(ops.oobbuf);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
ops.oobbuf = NULL;
|
|
|
|
}
|
|
|
|
|
2011-12-24 00:29:55 +08:00
|
|
|
ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
|
2011-09-10 00:59:03 +08:00
|
|
|
|
|
|
|
kfree(ops.datbuf);
|
|
|
|
kfree(ops.oobbuf);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2011-12-23 23:27:46 +08:00
|
|
|
static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2006-05-30 06:37:34 +08:00
|
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
|
|
struct mtd_info *mtd = mfi->mtd;
|
2020-01-14 17:09:52 +08:00
|
|
|
struct mtd_info *master = mtd_get_master(mtd);
|
2005-04-17 06:20:36 +08:00
|
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
int ret = 0;
|
2006-05-30 20:25:35 +08:00
|
|
|
struct mtd_info_user info;
|
2005-11-07 19:15:26 +08:00
|
|
|
|
2011-07-20 01:06:09 +08:00
|
|
|
pr_debug("MTD_ioctl\n");
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
switch (cmd) {
|
|
|
|
case MEMGETREGIONCOUNT:
|
|
|
|
if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
|
|
|
|
return -EFAULT;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case MEMGETREGIONINFO:
|
|
|
|
{
|
2008-09-01 20:02:12 +08:00
|
|
|
uint32_t ur_idx;
|
|
|
|
struct mtd_erase_region_info *kr;
|
2010-01-16 02:25:38 +08:00
|
|
|
struct region_info_user __user *ur = argp;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-09-01 20:02:12 +08:00
|
|
|
if (get_user(ur_idx, &(ur->regionindex)))
|
2005-04-17 06:20:36 +08:00
|
|
|
return -EFAULT;
|
|
|
|
|
2010-09-09 03:39:56 +08:00
|
|
|
if (ur_idx >= mtd->numeraseregions)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2008-09-01 20:02:12 +08:00
|
|
|
kr = &(mtd->eraseregions[ur_idx]);
|
|
|
|
|
|
|
|
if (put_user(kr->offset, &(ur->offset))
|
|
|
|
|| put_user(kr->erasesize, &(ur->erasesize))
|
|
|
|
|| put_user(kr->numblocks, &(ur->numblocks)))
|
2005-04-17 06:20:36 +08:00
|
|
|
return -EFAULT;
|
2008-09-01 20:02:12 +08:00
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
case MEMGETINFO:
|
2010-11-06 22:41:24 +08:00
|
|
|
memset(&info, 0, sizeof(info));
|
2006-05-30 20:25:35 +08:00
|
|
|
info.type = mtd->type;
|
|
|
|
info.flags = mtd->flags;
|
|
|
|
info.size = mtd->size;
|
|
|
|
info.erasesize = mtd->erasesize;
|
|
|
|
info.writesize = mtd->writesize;
|
|
|
|
info.oobsize = mtd->oobsize;
|
2011-08-31 09:45:46 +08:00
|
|
|
/* The below field is obsolete */
|
|
|
|
info.padding = 0;
|
2006-05-30 20:25:35 +08:00
|
|
|
if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
|
2005-04-17 06:20:36 +08:00
|
|
|
return -EFAULT;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case MEMERASE:
|
2009-04-09 13:52:28 +08:00
|
|
|
case MEMERASE64:
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
struct erase_info *erase;
|
|
|
|
|
2008-09-03 03:28:45 +08:00
|
|
|
if(!(file->f_mode & FMODE_WRITE))
|
2005-04-17 06:20:36 +08:00
|
|
|
return -EPERM;
|
|
|
|
|
2006-11-16 03:10:29 +08:00
|
|
|
erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
|
2005-04-17 06:20:36 +08:00
|
|
|
if (!erase)
|
|
|
|
ret = -ENOMEM;
|
|
|
|
else {
|
2009-04-09 13:52:28 +08:00
|
|
|
if (cmd == MEMERASE64) {
|
|
|
|
struct erase_info_user64 einfo64;
|
|
|
|
|
|
|
|
if (copy_from_user(&einfo64, argp,
|
|
|
|
sizeof(struct erase_info_user64))) {
|
|
|
|
kfree(erase);
|
|
|
|
return -EFAULT;
|
|
|
|
}
|
|
|
|
erase->addr = einfo64.start;
|
|
|
|
erase->len = einfo64.length;
|
|
|
|
} else {
|
|
|
|
struct erase_info_user einfo32;
|
|
|
|
|
|
|
|
if (copy_from_user(&einfo32, argp,
|
|
|
|
sizeof(struct erase_info_user))) {
|
|
|
|
kfree(erase);
|
|
|
|
return -EFAULT;
|
|
|
|
}
|
|
|
|
erase->addr = einfo32.start;
|
|
|
|
erase->len = einfo32.length;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2018-02-13 05:03:09 +08:00
|
|
|
|
2011-12-23 21:25:39 +08:00
|
|
|
ret = mtd_erase(mtd, erase);
|
2005-04-17 06:20:36 +08:00
|
|
|
kfree(erase);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
case MEMWRITEOOB:
|
|
|
|
{
|
|
|
|
struct mtd_oob_buf buf;
|
2009-04-09 13:53:13 +08:00
|
|
|
struct mtd_oob_buf __user *buf_user = argp;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2009-04-09 13:53:13 +08:00
|
|
|
/* NOTE: writes return length to buf_user->length */
|
|
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
2005-04-17 06:20:36 +08:00
|
|
|
ret = -EFAULT;
|
2009-04-09 13:53:13 +08:00
|
|
|
else
|
2011-12-23 23:27:46 +08:00
|
|
|
ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
|
2009-04-09 13:53:13 +08:00
|
|
|
buf.ptr, &buf_user->length);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
case MEMREADOOB:
|
|
|
|
{
|
|
|
|
struct mtd_oob_buf buf;
|
2009-04-09 13:53:13 +08:00
|
|
|
struct mtd_oob_buf __user *buf_user = argp;
|
2006-05-29 09:26:58 +08:00
|
|
|
|
2009-04-09 13:53:13 +08:00
|
|
|
/* NOTE: writes return length to buf_user->start */
|
|
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
2005-04-17 06:20:36 +08:00
|
|
|
ret = -EFAULT;
|
2009-04-09 13:53:13 +08:00
|
|
|
else
|
2011-12-23 23:27:46 +08:00
|
|
|
ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
|
2009-04-09 13:53:13 +08:00
|
|
|
buf.ptr, &buf_user->start);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2009-04-09 13:53:49 +08:00
|
|
|
case MEMWRITEOOB64:
|
|
|
|
{
|
|
|
|
struct mtd_oob_buf64 buf;
|
|
|
|
struct mtd_oob_buf64 __user *buf_user = argp;
|
|
|
|
|
|
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
|
|
ret = -EFAULT;
|
|
|
|
else
|
2011-12-23 23:27:46 +08:00
|
|
|
ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
|
2009-04-09 13:53:49 +08:00
|
|
|
(void __user *)(uintptr_t)buf.usr_ptr,
|
|
|
|
&buf_user->length);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
case MEMREADOOB64:
|
|
|
|
{
|
|
|
|
struct mtd_oob_buf64 buf;
|
|
|
|
struct mtd_oob_buf64 __user *buf_user = argp;
|
|
|
|
|
|
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
|
|
ret = -EFAULT;
|
|
|
|
else
|
2011-12-23 23:27:46 +08:00
|
|
|
ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
|
2009-04-09 13:53:49 +08:00
|
|
|
(void __user *)(uintptr_t)buf.usr_ptr,
|
|
|
|
&buf_user->length);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2011-09-10 00:59:03 +08:00
|
|
|
case MEMWRITE:
|
|
|
|
{
|
2011-12-23 23:27:46 +08:00
|
|
|
ret = mtdchar_write_ioctl(mtd,
|
2011-09-10 00:59:03 +08:00
|
|
|
(struct mtd_write_req __user *)arg);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
case MEMLOCK:
|
|
|
|
{
|
2008-07-04 14:40:14 +08:00
|
|
|
struct erase_info_user einfo;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-07-04 14:40:14 +08:00
|
|
|
if (copy_from_user(&einfo, argp, sizeof(einfo)))
|
2005-04-17 06:20:36 +08:00
|
|
|
return -EFAULT;
|
|
|
|
|
2011-12-30 23:00:35 +08:00
|
|
|
ret = mtd_lock(mtd, einfo.start, einfo.length);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
case MEMUNLOCK:
|
|
|
|
{
|
2008-07-04 14:40:14 +08:00
|
|
|
struct erase_info_user einfo;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-07-04 14:40:14 +08:00
|
|
|
if (copy_from_user(&einfo, argp, sizeof(einfo)))
|
2005-04-17 06:20:36 +08:00
|
|
|
return -EFAULT;
|
|
|
|
|
2011-12-30 23:00:35 +08:00
|
|
|
ret = mtd_unlock(mtd, einfo.start, einfo.length);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2010-06-15 00:10:33 +08:00
|
|
|
case MEMISLOCKED:
|
|
|
|
{
|
|
|
|
struct erase_info_user einfo;
|
|
|
|
|
|
|
|
if (copy_from_user(&einfo, argp, sizeof(einfo)))
|
|
|
|
return -EFAULT;
|
|
|
|
|
2011-12-30 23:00:35 +08:00
|
|
|
ret = mtd_is_locked(mtd, einfo.start, einfo.length);
|
2010-06-15 00:10:33 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2006-05-28 04:16:10 +08:00
|
|
|
/* Legacy interface */
|
2005-04-17 06:20:36 +08:00
|
|
|
case MEMGETOOBSEL:
|
|
|
|
{
|
2006-05-28 04:16:10 +08:00
|
|
|
struct nand_oobinfo oi;
|
|
|
|
|
2020-01-14 17:09:52 +08:00
|
|
|
if (!master->ooblayout)
|
2006-05-28 04:16:10 +08:00
|
|
|
return -EOPNOTSUPP;
|
|
|
|
|
2016-02-04 03:10:30 +08:00
|
|
|
ret = get_oobinfo(mtd, &oi);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
2006-05-28 04:16:10 +08:00
|
|
|
|
|
|
|
if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
|
2005-04-17 06:20:36 +08:00
|
|
|
return -EFAULT;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
case MEMGETBADBLOCK:
|
|
|
|
{
|
|
|
|
loff_t offs;
|
2005-11-07 19:15:26 +08:00
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
if (copy_from_user(&offs, argp, sizeof(loff_t)))
|
|
|
|
return -EFAULT;
|
2012-01-02 19:48:54 +08:00
|
|
|
return mtd_block_isbad(mtd, offs);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
case MEMSETBADBLOCK:
|
|
|
|
{
|
|
|
|
loff_t offs;
|
|
|
|
|
|
|
|
if (copy_from_user(&offs, argp, sizeof(loff_t)))
|
|
|
|
return -EFAULT;
|
2012-01-02 19:59:12 +08:00
|
|
|
return mtd_block_markbad(mtd, offs);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2005-02-09 01:45:55 +08:00
|
|
|
case OTPSELECT:
|
|
|
|
{
|
|
|
|
int mode;
|
|
|
|
if (copy_from_user(&mode, argp, sizeof(int)))
|
|
|
|
return -EFAULT;
|
2006-05-30 06:37:34 +08:00
|
|
|
|
2011-08-31 09:45:41 +08:00
|
|
|
mfi->mode = MTD_FILE_MODE_NORMAL;
|
2006-05-30 06:37:34 +08:00
|
|
|
|
|
|
|
ret = otp_select_filemode(mfi, mode);
|
|
|
|
|
2005-04-01 23:36:15 +08:00
|
|
|
file->f_pos = 0;
|
2005-02-09 01:45:55 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
case OTPGETREGIONCOUNT:
|
|
|
|
case OTPGETREGIONINFO:
|
|
|
|
{
|
|
|
|
struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
|
2014-01-28 16:29:44 +08:00
|
|
|
size_t retlen;
|
2005-02-09 01:45:55 +08:00
|
|
|
if (!buf)
|
|
|
|
return -ENOMEM;
|
2006-05-30 06:37:34 +08:00
|
|
|
switch (mfi->mode) {
|
2011-08-31 09:45:41 +08:00
|
|
|
case MTD_FILE_MODE_OTP_FACTORY:
|
2014-01-28 16:29:44 +08:00
|
|
|
ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf);
|
2005-02-09 01:45:55 +08:00
|
|
|
break;
|
2011-08-31 09:45:41 +08:00
|
|
|
case MTD_FILE_MODE_OTP_USER:
|
2014-01-28 16:29:44 +08:00
|
|
|
ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf);
|
2005-02-09 01:45:55 +08:00
|
|
|
break;
|
2006-05-30 06:37:34 +08:00
|
|
|
default:
|
2011-12-29 00:47:46 +08:00
|
|
|
ret = -EINVAL;
|
2006-05-30 06:37:34 +08:00
|
|
|
break;
|
2005-02-09 01:45:55 +08:00
|
|
|
}
|
2014-01-28 16:29:44 +08:00
|
|
|
if (!ret) {
|
2005-02-09 01:45:55 +08:00
|
|
|
if (cmd == OTPGETREGIONCOUNT) {
|
2014-01-28 16:29:44 +08:00
|
|
|
int nbr = retlen / sizeof(struct otp_info);
|
2005-02-09 01:45:55 +08:00
|
|
|
ret = copy_to_user(argp, &nbr, sizeof(int));
|
|
|
|
} else
|
2014-01-28 16:29:44 +08:00
|
|
|
ret = copy_to_user(argp, buf, retlen);
|
2005-02-09 01:45:55 +08:00
|
|
|
if (ret)
|
|
|
|
ret = -EFAULT;
|
|
|
|
}
|
|
|
|
kfree(buf);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
case OTPLOCK:
|
|
|
|
{
|
2008-07-04 14:40:14 +08:00
|
|
|
struct otp_info oinfo;
|
2005-02-09 01:45:55 +08:00
|
|
|
|
2011-08-31 09:45:41 +08:00
|
|
|
if (mfi->mode != MTD_FILE_MODE_OTP_USER)
|
2005-02-09 01:45:55 +08:00
|
|
|
return -EINVAL;
|
2008-07-04 14:40:14 +08:00
|
|
|
if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
|
2005-02-09 01:45:55 +08:00
|
|
|
return -EFAULT;
|
2011-12-24 00:55:49 +08:00
|
|
|
ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
|
2005-02-09 01:45:55 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2011-06-24 05:12:08 +08:00
|
|
|
/* This ioctl is being deprecated - it truncates the ECC layout */
|
2006-05-30 06:37:34 +08:00
|
|
|
case ECCGETLAYOUT:
|
|
|
|
{
|
2010-08-25 09:12:00 +08:00
|
|
|
struct nand_ecclayout_user *usrlay;
|
|
|
|
|
2020-01-14 17:09:52 +08:00
|
|
|
if (!master->ooblayout)
|
2006-05-30 06:37:34 +08:00
|
|
|
return -EOPNOTSUPP;
|
|
|
|
|
2010-08-25 09:12:00 +08:00
|
|
|
usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
|
|
|
|
if (!usrlay)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2016-02-04 03:10:30 +08:00
|
|
|
shrink_ecclayout(mtd, usrlay);
|
2010-08-25 09:12:00 +08:00
|
|
|
|
|
|
|
if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
|
|
|
|
ret = -EFAULT;
|
|
|
|
kfree(usrlay);
|
2006-05-30 06:37:34 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
case ECCGETSTATS:
|
|
|
|
{
|
|
|
|
if (copy_to_user(argp, &mtd->ecc_stats,
|
|
|
|
sizeof(struct mtd_ecc_stats)))
|
|
|
|
return -EFAULT;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
case MTDFILEMODE:
|
|
|
|
{
|
|
|
|
mfi->mode = 0;
|
|
|
|
|
|
|
|
switch(arg) {
|
2011-08-31 09:45:41 +08:00
|
|
|
case MTD_FILE_MODE_OTP_FACTORY:
|
|
|
|
case MTD_FILE_MODE_OTP_USER:
|
2006-05-30 06:37:34 +08:00
|
|
|
ret = otp_select_filemode(mfi, arg);
|
|
|
|
break;
|
|
|
|
|
2011-08-31 09:45:41 +08:00
|
|
|
case MTD_FILE_MODE_RAW:
|
2011-12-29 00:35:07 +08:00
|
|
|
if (!mtd_has_oob(mtd))
|
2006-05-30 06:37:34 +08:00
|
|
|
return -EOPNOTSUPP;
|
|
|
|
mfi->mode = arg;
|
|
|
|
|
2011-08-31 09:45:41 +08:00
|
|
|
case MTD_FILE_MODE_NORMAL:
|
2006-05-30 06:37:34 +08:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
ret = -EINVAL;
|
|
|
|
}
|
|
|
|
file->f_pos = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2010-09-17 18:31:42 +08:00
|
|
|
case BLKPG:
|
|
|
|
{
|
2015-09-22 04:26:59 +08:00
|
|
|
struct blkpg_ioctl_arg __user *blk_arg = argp;
|
|
|
|
struct blkpg_ioctl_arg a;
|
|
|
|
|
|
|
|
if (copy_from_user(&a, blk_arg, sizeof(a)))
|
|
|
|
ret = -EFAULT;
|
|
|
|
else
|
|
|
|
ret = mtdchar_blkpg_ioctl(mtd, &a);
|
2010-09-17 18:31:42 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
case BLKRRPART:
|
|
|
|
{
|
|
|
|
/* No reread partition feature. Just return ok */
|
|
|
|
ret = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
default:
|
|
|
|
ret = -ENOTTY;
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
} /* memory_ioctl */
|
|
|
|
|
2011-12-23 23:27:46 +08:00
|
|
|
static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
|
2010-04-27 06:24:05 +08:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
2010-06-02 20:28:52 +08:00
|
|
|
mutex_lock(&mtd_mutex);
|
2011-12-23 23:27:46 +08:00
|
|
|
ret = mtdchar_ioctl(file, cmd, arg);
|
2010-06-02 20:28:52 +08:00
|
|
|
mutex_unlock(&mtd_mutex);
|
2010-04-27 06:24:05 +08:00
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2009-04-09 13:53:13 +08:00
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
|
|
|
|
struct mtd_oob_buf32 {
|
|
|
|
u_int32_t start;
|
|
|
|
u_int32_t length;
|
|
|
|
compat_caddr_t ptr; /* unsigned char* */
|
|
|
|
};
|
|
|
|
|
|
|
|
#define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
|
|
|
|
#define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
|
|
|
|
|
2011-12-23 23:27:46 +08:00
|
|
|
static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
|
2009-04-09 13:53:13 +08:00
|
|
|
unsigned long arg)
|
|
|
|
{
|
|
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
|
|
struct mtd_info *mtd = mfi->mtd;
|
2009-05-29 23:09:08 +08:00
|
|
|
void __user *argp = compat_ptr(arg);
|
2009-04-09 13:53:13 +08:00
|
|
|
int ret = 0;
|
|
|
|
|
2010-06-02 20:28:52 +08:00
|
|
|
mutex_lock(&mtd_mutex);
|
2009-04-09 13:53:13 +08:00
|
|
|
|
|
|
|
switch (cmd) {
|
|
|
|
case MEMWRITEOOB32:
|
|
|
|
{
|
|
|
|
struct mtd_oob_buf32 buf;
|
|
|
|
struct mtd_oob_buf32 __user *buf_user = argp;
|
|
|
|
|
|
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
|
|
ret = -EFAULT;
|
|
|
|
else
|
2011-12-23 23:27:46 +08:00
|
|
|
ret = mtdchar_writeoob(file, mtd, buf.start,
|
2009-04-09 13:53:13 +08:00
|
|
|
buf.length, compat_ptr(buf.ptr),
|
|
|
|
&buf_user->length);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
case MEMREADOOB32:
|
|
|
|
{
|
|
|
|
struct mtd_oob_buf32 buf;
|
|
|
|
struct mtd_oob_buf32 __user *buf_user = argp;
|
|
|
|
|
|
|
|
/* NOTE: writes return length to buf->start */
|
|
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
|
|
ret = -EFAULT;
|
|
|
|
else
|
2011-12-23 23:27:46 +08:00
|
|
|
ret = mtdchar_readoob(file, mtd, buf.start,
|
2009-04-09 13:53:13 +08:00
|
|
|
buf.length, compat_ptr(buf.ptr),
|
|
|
|
&buf_user->start);
|
|
|
|
break;
|
|
|
|
}
|
2015-09-22 04:26:59 +08:00
|
|
|
|
|
|
|
case BLKPG:
|
|
|
|
{
|
|
|
|
/* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */
|
|
|
|
struct blkpg_compat_ioctl_arg __user *uarg = argp;
|
|
|
|
struct blkpg_compat_ioctl_arg compat_arg;
|
|
|
|
struct blkpg_ioctl_arg a;
|
|
|
|
|
|
|
|
if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) {
|
|
|
|
ret = -EFAULT;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
memset(&a, 0, sizeof(a));
|
|
|
|
a.op = compat_arg.op;
|
|
|
|
a.flags = compat_arg.flags;
|
|
|
|
a.datalen = compat_arg.datalen;
|
|
|
|
a.data = compat_ptr(compat_arg.data);
|
|
|
|
|
|
|
|
ret = mtdchar_blkpg_ioctl(mtd, &a);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2009-04-09 13:53:13 +08:00
|
|
|
default:
|
2011-12-23 23:27:46 +08:00
|
|
|
ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
|
2009-04-09 13:53:13 +08:00
|
|
|
}
|
|
|
|
|
2010-06-02 20:28:52 +08:00
|
|
|
mutex_unlock(&mtd_mutex);
|
2009-04-09 13:53:13 +08:00
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
|
2009-02-12 18:40:00 +08:00
|
|
|
/*
|
|
|
|
* try to determine where a shared mapping can be made
|
|
|
|
* - only supported for NOMMU at the moment (MMU can't doesn't copy private
|
|
|
|
* mappings)
|
|
|
|
*/
|
|
|
|
#ifndef CONFIG_MMU
|
2011-12-23 23:27:46 +08:00
|
|
|
static unsigned long mtdchar_get_unmapped_area(struct file *file,
|
2009-02-12 18:40:00 +08:00
|
|
|
unsigned long addr,
|
|
|
|
unsigned long len,
|
|
|
|
unsigned long pgoff,
|
|
|
|
unsigned long flags)
|
|
|
|
{
|
|
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
|
|
struct mtd_info *mtd = mfi->mtd;
|
2011-12-30 20:31:57 +08:00
|
|
|
unsigned long offset;
|
|
|
|
int ret;
|
2009-02-12 18:40:00 +08:00
|
|
|
|
2011-12-30 20:31:57 +08:00
|
|
|
if (addr != 0)
|
|
|
|
return (unsigned long) -EINVAL;
|
2009-02-12 18:40:00 +08:00
|
|
|
|
2011-12-30 20:31:57 +08:00
|
|
|
if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
|
|
|
|
return (unsigned long) -EINVAL;
|
2009-02-12 18:40:00 +08:00
|
|
|
|
2011-12-30 20:31:57 +08:00
|
|
|
offset = pgoff << PAGE_SHIFT;
|
|
|
|
if (offset > mtd->size - len)
|
|
|
|
return (unsigned long) -EINVAL;
|
2009-02-12 18:40:00 +08:00
|
|
|
|
2011-12-30 20:31:57 +08:00
|
|
|
ret = mtd_get_unmapped_area(mtd, len, offset, flags);
|
2013-10-29 00:08:15 +08:00
|
|
|
return ret == -EOPNOTSUPP ? -ENODEV : ret;
|
2009-02-12 18:40:00 +08:00
|
|
|
}
|
2015-01-14 17:42:32 +08:00
|
|
|
|
|
|
|
static unsigned mtdchar_mmap_capabilities(struct file *file)
|
|
|
|
{
|
|
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
|
|
|
|
|
|
return mtd_mmap_capabilities(mfi->mtd);
|
|
|
|
}
|
2009-02-12 18:40:00 +08:00
|
|
|
#endif
|
|
|
|
|
|
|
|
/*
|
|
|
|
* set up a mapping for shared memory segments
|
|
|
|
*/
|
2011-12-23 23:27:46 +08:00
|
|
|
static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
|
2009-02-12 18:40:00 +08:00
|
|
|
{
|
|
|
|
#ifdef CONFIG_MMU
|
|
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
|
|
struct mtd_info *mtd = mfi->mtd;
|
2010-06-15 15:30:15 +08:00
|
|
|
struct map_info *map = mtd->priv;
|
|
|
|
|
2012-10-09 22:08:10 +08:00
|
|
|
/* This is broken because it assumes the MTD device is map-based
|
|
|
|
and that mtd->priv is a valid struct map_info. It should be
|
|
|
|
replaced with something that uses the mtd_get_unmapped_area()
|
|
|
|
operation properly. */
|
|
|
|
if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
|
2010-06-15 15:30:15 +08:00
|
|
|
#ifdef pgprot_noncached
|
2013-04-20 00:53:07 +08:00
|
|
|
if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
|
2010-06-15 15:30:15 +08:00
|
|
|
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
|
|
|
|
#endif
|
2013-04-20 00:53:07 +08:00
|
|
|
return vm_iomap_memory(vma, map->phys, map->size);
|
2010-06-15 15:30:15 +08:00
|
|
|
}
|
2013-10-29 00:08:15 +08:00
|
|
|
return -ENODEV;
|
2009-02-12 18:40:00 +08:00
|
|
|
#else
|
2013-10-29 00:08:15 +08:00
|
|
|
return vma->vm_flags & VM_SHARED ? 0 : -EACCES;
|
2009-02-12 18:40:00 +08:00
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
2007-02-12 16:55:34 +08:00
|
|
|
static const struct file_operations mtd_fops = {
|
2005-04-17 06:20:36 +08:00
|
|
|
.owner = THIS_MODULE,
|
2011-12-23 23:27:46 +08:00
|
|
|
.llseek = mtdchar_lseek,
|
|
|
|
.read = mtdchar_read,
|
|
|
|
.write = mtdchar_write,
|
|
|
|
.unlocked_ioctl = mtdchar_unlocked_ioctl,
|
2009-04-09 13:53:13 +08:00
|
|
|
#ifdef CONFIG_COMPAT
|
2011-12-23 23:27:46 +08:00
|
|
|
.compat_ioctl = mtdchar_compat_ioctl,
|
2009-04-09 13:53:13 +08:00
|
|
|
#endif
|
2011-12-23 23:27:46 +08:00
|
|
|
.open = mtdchar_open,
|
|
|
|
.release = mtdchar_close,
|
|
|
|
.mmap = mtdchar_mmap,
|
2009-02-12 18:40:00 +08:00
|
|
|
#ifndef CONFIG_MMU
|
2011-12-23 23:27:46 +08:00
|
|
|
.get_unmapped_area = mtdchar_get_unmapped_area,
|
2015-01-14 17:42:32 +08:00
|
|
|
.mmap_capabilities = mtdchar_mmap_capabilities,
|
2009-02-12 18:40:00 +08:00
|
|
|
#endif
|
2005-04-17 06:20:36 +08:00
|
|
|
};
|
|
|
|
|
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 19:27:40 +08:00
|
|
|
int __init init_mtdchar(void)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2010-05-17 21:55:47 +08:00
|
|
|
int ret;
|
2009-03-26 15:42:41 +08:00
|
|
|
|
2010-05-17 21:55:47 +08:00
|
|
|
ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
|
2010-01-30 05:00:04 +08:00
|
|
|
"mtd", &mtd_fops);
|
2010-05-17 21:55:47 +08:00
|
|
|
if (ret < 0) {
|
2013-03-15 18:59:36 +08:00
|
|
|
pr_err("Can't allocate major number %d for MTD\n",
|
|
|
|
MTD_CHAR_MAJOR);
|
2010-05-17 21:55:47 +08:00
|
|
|
return ret;
|
2005-06-30 08:23:27 +08:00
|
|
|
}
|
|
|
|
|
2010-05-17 21:55:47 +08:00
|
|
|
return ret;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
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 19:27:40 +08:00
|
|
|
void __exit cleanup_mtdchar(void)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2010-01-30 05:00:04 +08:00
|
|
|
__unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2009-03-03 02:42:39 +08:00
|
|
|
MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
|