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authorH. Nikolaus Schaller <hns@goldelico.com>2012-03-26 20:55:28 +0200
committerH. Nikolaus Schaller <hns@goldelico.com>2012-03-26 20:55:28 +0200
commit92988a21ad4c4c9504295ccb580c9f806134471b (patch)
tree5effc9f14170112450de05c67dafbe8d5034d595 /include/mtd/ubi-user.h
parentca2b506783b676c95762c54ea24dcfdaae1947c9 (diff)
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added boot script files to repository
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-/*
- * Copyright (c) International Business Machines Corp., 2006
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
- * the GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Author: Artem Bityutskiy (Битюцкий Артём)
- */
-
-#ifndef __UBI_USER_H__
-#define __UBI_USER_H__
-
-/*
- * UBI device creation (the same as MTD device attachment)
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * MTD devices may be attached using %UBI_IOCATT ioctl command of the UBI
- * control device. The caller has to properly fill and pass
- * &struct ubi_attach_req object - UBI will attach the MTD device specified in
- * the request and return the newly created UBI device number as the ioctl
- * return value.
- *
- * UBI device deletion (the same as MTD device detachment)
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * An UBI device maybe deleted with %UBI_IOCDET ioctl command of the UBI
- * control device.
- *
- * UBI volume creation
- * ~~~~~~~~~~~~~~~~~~~
- *
- * UBI volumes are created via the %UBI_IOCMKVOL IOCTL command of UBI character
- * device. A &struct ubi_mkvol_req object has to be properly filled and a
- * pointer to it has to be passed to the IOCTL.
- *
- * UBI volume deletion
- * ~~~~~~~~~~~~~~~~~~~
- *
- * To delete a volume, the %UBI_IOCRMVOL IOCTL command of the UBI character
- * device should be used. A pointer to the 32-bit volume ID hast to be passed
- * to the IOCTL.
- *
- * UBI volume re-size
- * ~~~~~~~~~~~~~~~~~~
- *
- * To re-size a volume, the %UBI_IOCRSVOL IOCTL command of the UBI character
- * device should be used. A &struct ubi_rsvol_req object has to be properly
- * filled and a pointer to it has to be passed to the IOCTL.
- *
- * UBI volume update
- * ~~~~~~~~~~~~~~~~~
- *
- * Volume update should be done via the %UBI_IOCVOLUP IOCTL command of the
- * corresponding UBI volume character device. A pointer to a 64-bit update
- * size should be passed to the IOCTL. After this, UBI expects user to write
- * this number of bytes to the volume character device. The update is finished
- * when the claimed number of bytes is passed. So, the volume update sequence
- * is something like:
- *
- * fd = open("/dev/my_volume");
- * ioctl(fd, UBI_IOCVOLUP, &image_size);
- * write(fd, buf, image_size);
- * close(fd);
- *
- * Atomic eraseblock change
- * ~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * Atomic eraseblock change operation is done via the %UBI_IOCEBCH IOCTL
- * command of the corresponding UBI volume character device. A pointer to
- * &struct ubi_leb_change_req has to be passed to the IOCTL. Then the user is
- * expected to write the requested amount of bytes. This is similar to the
- * "volume update" IOCTL.
- */
-
-/*
- * When a new UBI volume or UBI device is created, users may either specify the
- * volume/device number they want to create or to let UBI automatically assign
- * the number using these constants.
- */
-#define UBI_VOL_NUM_AUTO (-1)
-#define UBI_DEV_NUM_AUTO (-1)
-
-/* Maximum volume name length */
-#define UBI_MAX_VOLUME_NAME 127
-
-/* IOCTL commands of UBI character devices */
-
-#define UBI_IOC_MAGIC 'o'
-
-/* Create an UBI volume */
-#define UBI_IOCMKVOL _IOW(UBI_IOC_MAGIC, 0, struct ubi_mkvol_req)
-/* Remove an UBI volume */
-#define UBI_IOCRMVOL _IOW(UBI_IOC_MAGIC, 1, int32_t)
-/* Re-size an UBI volume */
-#define UBI_IOCRSVOL _IOW(UBI_IOC_MAGIC, 2, struct ubi_rsvol_req)
-
-/* IOCTL commands of the UBI control character device */
-
-#define UBI_CTRL_IOC_MAGIC 'o'
-
-/* Attach an MTD device */
-#define UBI_IOCATT _IOW(UBI_CTRL_IOC_MAGIC, 64, struct ubi_attach_req)
-/* Detach an MTD device */
-#define UBI_IOCDET _IOW(UBI_CTRL_IOC_MAGIC, 65, int32_t)
-
-/* IOCTL commands of UBI volume character devices */
-
-#define UBI_VOL_IOC_MAGIC 'O'
-
-/* Start UBI volume update */
-#define UBI_IOCVOLUP _IOW(UBI_VOL_IOC_MAGIC, 0, int64_t)
-/* An eraseblock erasure command, used for debugging, disabled by default */
-#define UBI_IOCEBER _IOW(UBI_VOL_IOC_MAGIC, 1, int32_t)
-/* An atomic eraseblock change command */
-#define UBI_IOCEBCH _IOW(UBI_VOL_IOC_MAGIC, 2, int32_t)
-
-/* Maximum MTD device name length supported by UBI */
-#define MAX_UBI_MTD_NAME_LEN 127
-
-/*
- * UBI data type hint constants.
- *
- * UBI_LONGTERM: long-term data
- * UBI_SHORTTERM: short-term data
- * UBI_UNKNOWN: data persistence is unknown
- *
- * These constants are used when data is written to UBI volumes in order to
- * help the UBI wear-leveling unit to find more appropriate physical
- * eraseblocks.
- */
-enum {
- UBI_LONGTERM = 1,
- UBI_SHORTTERM = 2,
- UBI_UNKNOWN = 3,
-};
-
-/*
- * UBI volume type constants.
- *
- * @UBI_DYNAMIC_VOLUME: dynamic volume
- * @UBI_STATIC_VOLUME: static volume
- */
-enum {
- UBI_DYNAMIC_VOLUME = 3,
- UBI_STATIC_VOLUME = 4,
-};
-
-/**
- * struct ubi_attach_req - attach MTD device request.
- * @ubi_num: UBI device number to create
- * @mtd_num: MTD device number to attach
- * @vid_hdr_offset: VID header offset (use defaults if %0)
- * @padding: reserved for future, not used, has to be zeroed
- *
- * This data structure is used to specify MTD device UBI has to attach and the
- * parameters it has to use. The number which should be assigned to the new UBI
- * device is passed in @ubi_num. UBI may automatically assign the number if
- * @UBI_DEV_NUM_AUTO is passed. In this case, the device number is returned in
- * @ubi_num.
- *
- * Most applications should pass %0 in @vid_hdr_offset to make UBI use default
- * offset of the VID header within physical eraseblocks. The default offset is
- * the next min. I/O unit after the EC header. For example, it will be offset
- * 512 in case of a 512 bytes page NAND flash with no sub-page support. Or
- * it will be 512 in case of a 2KiB page NAND flash with 4 512-byte sub-pages.
- *
- * But in rare cases, if this optimizes things, the VID header may be placed to
- * a different offset. For example, the boot-loader might do things faster if the
- * VID header sits at the end of the first 2KiB NAND page with 4 sub-pages. As
- * the boot-loader would not normally need to read EC headers (unless it needs
- * UBI in RW mode), it might be faster to calculate ECC. This is weird example,
- * but it real-life example. So, in this example, @vid_hdr_offer would be
- * 2KiB-64 bytes = 1984. Note, that this position is not even 512-bytes
- * aligned, which is OK, as UBI is clever enough to realize this is 4th sub-page
- * of the first page and add needed padding.
- */
-struct ubi_attach_req {
- int32_t ubi_num;
- int32_t mtd_num;
- int32_t vid_hdr_offset;
- uint8_t padding[12];
-};
-
-/**
- * struct ubi_mkvol_req - volume description data structure used in
- * volume creation requests.
- * @vol_id: volume number
- * @alignment: volume alignment
- * @bytes: volume size in bytes
- * @vol_type: volume type (%UBI_DYNAMIC_VOLUME or %UBI_STATIC_VOLUME)
- * @padding1: reserved for future, not used, has to be zeroed
- * @name_len: volume name length
- * @padding2: reserved for future, not used, has to be zeroed
- * @name: volume name
- *
- * This structure is used by user-space programs when creating new volumes. The
- * @used_bytes field is only necessary when creating static volumes.
- *
- * The @alignment field specifies the required alignment of the volume logical
- * eraseblock. This means, that the size of logical eraseblocks will be aligned
- * to this number, i.e.,
- * (UBI device logical eraseblock size) mod (@alignment) = 0.
- *
- * To put it differently, the logical eraseblock of this volume may be slightly
- * shortened in order to make it properly aligned. The alignment has to be
- * multiple of the flash minimal input/output unit, or %1 to utilize the entire
- * available space of logical eraseblocks.
- *
- * The @alignment field may be useful, for example, when one wants to maintain
- * a block device on top of an UBI volume. In this case, it is desirable to fit
- * an integer number of blocks in logical eraseblocks of this UBI volume. With
- * alignment it is possible to update this volume using plane UBI volume image
- * BLOBs, without caring about how to properly align them.
- */
-struct ubi_mkvol_req {
- int32_t vol_id;
- int32_t alignment;
- int64_t bytes;
- int8_t vol_type;
- int8_t padding1;
- int16_t name_len;
- int8_t padding2[4];
- char name[UBI_MAX_VOLUME_NAME + 1];
-} __attribute__ ((packed));
-
-/**
- * struct ubi_rsvol_req - a data structure used in volume re-size requests.
- * @vol_id: ID of the volume to re-size
- * @bytes: new size of the volume in bytes
- *
- * Re-sizing is possible for both dynamic and static volumes. But while dynamic
- * volumes may be re-sized arbitrarily, static volumes cannot be made to be
- * smaller then the number of bytes they bear. To arbitrarily shrink a static
- * volume, it must be wiped out first (by means of volume update operation with
- * zero number of bytes).
- */
-struct ubi_rsvol_req {
- int64_t bytes;
- int32_t vol_id;
-} __attribute__ ((packed));
-
-/**
- * struct ubi_leb_change_req - a data structure used in atomic logical
- * eraseblock change requests.
- * @lnum: logical eraseblock number to change
- * @bytes: how many bytes will be written to the logical eraseblock
- * @dtype: data type (%UBI_LONGTERM, %UBI_SHORTTERM, %UBI_UNKNOWN)
- * @padding: reserved for future, not used, has to be zeroed
- */
-struct ubi_leb_change_req {
- int32_t lnum;
- int32_t bytes;
- uint8_t dtype;
- uint8_t padding[7];
-} __attribute__ ((packed));
-
-#endif /* __UBI_USER_H__ */