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* [MTD] Add mtd panic_write function pointerRichard Purdie2008-02-07
| | | | | | | | | | | | | | | | | | | | | | | MTDs are well suited for logging critical data and the mtdoops driver allows kernel panics/oops to be written to flash in a blackbox flight recorder fashion allowing better debugging and analysis of crashes. Any kernel oops in user context can be easily handled since the kernel continues as normal and any queued mtd writes are scheduled. Any kernel oops in interrupt context results in a panic and the delayed writes will not be scheduled however. The existing mtd->write function cannot be called in interrupt context so these messages can never be written to flash. This patch adds a panic_write function pointer that drivers can optionally implement which can be called in interrupt context. It is only intended to be called when its known the kernel is about to panic and we need to 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). Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* Merge git://git.infradead.org/~dedekind/ubi-2.6David Woodhouse2008-02-03
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| * UBI: introduce atomic LEB change ioctlArtem Bityutskiy2008-01-25
| | | | | | | | | | | | | | | | | | We have to be able to change individual LEBs for utilities like ubifsck, ubifstune. For example, ubifsck has to be able to fix errors on the media, ubifstune has to be able to change the the superblock, hence this ioctl. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* | Merge git://git.infradead.org/~kmpark/onenand-mtd-2.6David Woodhouse2008-02-03
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| * | [MTD] [OneNAND] Get correct density from device IDKyungmin Park2008-01-29
| |/ | | | | | | | | | | Use the higher bits for other purpose. Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
* / [MTD] Factor out OF partition support from the NOR driver.Scott Wood2008-02-03
|/ | | | | Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [MTD] [NOR] Fix incorrect interface code for x16/x32 chipsBartlomiej Sieka2008-01-10
| | | | | | | | | According to "Common Flash Memory Interface Publication 100" dated December 1, 2001, the interface code for x16/x32 chips is 0x0005, and not 0x0004 used so far. Signed-off-by: Bartlomiej Sieka <tur@semihalf.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* UBI: add ubi_leb_map interfaceArtem Bityutskiy2007-12-26
| | | | | | | | | | | | | | The idea of this interface belongs to Adrian Hunter. The interface is extremely useful when one has to have a guarantee that an LEB will contain all 0xFFs even in case of an unclean reboot. UBI does have an 'ubi_leb_erase()' call which may do this, but it is stupid and ineffecient, because it flushes whole queue. I should be re-worked to just be a pair of unmap, map calls. The user of the interfaci is UBIFS at the moment. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* [MTD] Provide mtdram.h with mtdram_init_device() prototypeJesper Nilsson2007-11-06
| | | | | | | | | This is used by axisflashmap.c to boot from ram. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: Mikael Starvik <starvik@axis.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [MTD] [NOR] fix ctrl-alt-del can't reboot for intel flash bugKevin Hao2007-10-13
| | | | | | | | | | | | When we press ctrl-alt-del,kernel_restart_prepare will invoke cfi_intelext_reboot which will set flash to read array mode, but later when device_shutdown is invoked which may put current work queue to sleep and other process may be scheduled to running and programming flash in not FL_READY mode again. So we can't boot up if this flash is used for bootloader. Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [MTD] Document erase interface.Jörn Engel2007-09-21
| | | | | | | Document mtd erase interface. Signed-off-by: Jörn Engel <joern@logfs.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [MTD] Fix CFI build error when no map width or interleave supportedDavid Woodhouse2007-09-06
| | | | | | | | | | | | | | When building NOR flash support, you have compile-time options for the bus width and the number of individual chips which are interleaved together onto that bus. The code to deal with arbitrary geometry is a bit convoluted, and people want to just configure it for the specific hardware they have, to avoid the runtime overhead. Selecting _none_ of the available options doesn't make any sense. You should have at least one. This makes it build though, since people persist in trying. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [MTD] [NAND] Add NAND manufacturer AMD.Steven J. Hill2007-07-23
| | | | | | | This patch adds the manufacturer ID for AMD flash. Signed-off-by: Steven J. Hill <sjhill1@rockwellcollins.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [MTD] [OneNAND] 2X program supportKyungmin Park2007-06-30
| | | | | | | | | | | | | | | | | | | The 2X Program is an extension of Program Operation. Since the device is equipped with two DataRAMs, and two-plane NAND Flash memory array, these two component enables simultaneous program of 4KiB. Plane1 has only even blocks such as block0, block2, block4 while Plane2 has only odd blocks such as block1, block3, block5. So MTD regards it as 4KiB page size and 256KiB block size Now the following chips support it. (KFXXX16Q2M) Demux: KFG2G16Q2M, KFH4G16Q2M, KFW8G16Q2M, Mux: KFM2G16Q2M, KFN4G16Q2M, And more recent chips Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [MTD] generalise the handling of MTD-specific superblocksDavid Howells2007-05-11
| | | | | | | | | Generalise the handling of MTD-specific superblocks so that JFFS2 and ROMFS can both share it. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [MTD] Delete allegedly obsolete "bank_size" field of mtd_info.Robert P. J. Day2007-05-09
| | | | | | | Delete the allegedly obsolete "bank_size" member of struct mtd_info. Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [MTD] Remove unnecessary user space check from mtd.h.Robert P. J. Day2007-05-09
| | | | | | | | Since the header file include/linux/mtd/mtd.h is not exported to user space, remove the user space check and error. Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [MTD] [NAND] platform NAND driver: update headerVitaly Wool2007-05-07
| | | | | | | | This patch extends nand.h in order to enable platform NAND driver. Signed-off-by: Vitaly Wool <vitalywool@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* Merge branch 'master' of ↵David Woodhouse2007-04-27
|\ | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 Conflicts: drivers/mtd/Kconfig Signed-off-by: David Woodhouse <dwmw2@infradead.org>
| * UBI: Unsorted Block ImagesArtem B. Bityutskiy2007-04-27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | UBI (Latin: "where?") manages multiple logical volumes on a single flash device, specifically supporting NAND flash devices. UBI provides a flexible partitioning concept which still allows for wear-levelling across the whole flash device. In a sense, UBI may be compared to the Logical Volume Manager (LVM). Whereas LVM maps logical sector numbers to physical HDD sector numbers, UBI maps logical eraseblocks to physical eraseblocks. More information may be found at http://www.linux-mtd.infradead.org/doc/ubi.html Partitioning/Re-partitioning An UBI volume occupies a certain number of erase blocks. This is limited by a configured maximum volume size, which could also be viewed as the partition size. Each individual UBI volume's size can be changed independently of the other UBI volumes, provided that the sum of all volume sizes doesn't exceed a certain limit. UBI supports dynamic volumes and static volumes. Static volumes are read-only and their contents are protected by CRC check sums. Bad eraseblocks handling UBI transparently handles bad eraseblocks. When a physical eraseblock becomes bad, it is substituted by a good physical eraseblock, and the user does not even notice this. Scrubbing On a NAND flash bit flips can occur on any write operation, sometimes also on read. If bit flips persist on the device, at first they can still be corrected by ECC, but once they accumulate, correction will become impossible. Thus it is best to actively scrub the affected eraseblock, by first copying it to a free eraseblock and then erasing the original. The UBI layer performs this type of scrubbing under the covers, transparently to the UBI volume users. Erase Counts UBI maintains an erase count header per eraseblock. This frees higher-level layers (like file systems) from doing this and allows for centralized erase count management instead. The erase counts are used by the wear-levelling algorithm in the UBI layer. The algorithm itself is exchangeable. Booting from NAND For booting directly from NAND flash the hardware must at least be capable of fetching and executing a small portion of the NAND flash. Some NAND flash controllers have this kind of support. They usually limit the window to a few kilobytes in erase block 0. This "initial program loader" (IPL) must then contain sufficient logic to load and execute the next boot phase. Due to bad eraseblocks, which may be randomly scattered over the flash device, it is problematic to store the "secondary program loader" (SPL) statically. Also, due to bit-flips it may become corrupted over time. UBI allows to solve this problem gracefully by storing the SPL in a small static UBI volume. UBI volumes vs. static partitions UBI volumes are still very similar to static MTD partitions: * both consist of eraseblocks (logical eraseblocks in case of UBI volumes, and physical eraseblocks in case of static partitions; * both support three basic operations - read, write, erase. But UBI volumes have the following advantages over traditional static MTD partitions: * there are no eraseblock wear-leveling constraints in case of UBI volumes, so the user should not care about this; * there are no bit-flips and bad eraseblocks in case of UBI volumes. So, UBI volumes may be considered as flash devices with relaxed restrictions. Where can it be found? Documentation, kernel code and applications can be found in the MTD gits. What are the applications for? The applications help to create binary flash images for two purposes: pfi files (partial flash images) for in-system update of UBI volumes, and plain binary images, with or without OOB data in case of NAND, for a manufacturing step. Furthermore some tools are/and will be created that allow flash content analysis after a system has crashed.. Who did UBI? The original ideas, where UBI is based on, were developed by Andreas Arnez, Frank Haverkamp and Thomas Gleixner. Josh W. Boyer and some others were involved too. The implementation of the kernel layer was done by Artem B. Bityutskiy. The user-space applications and tools were written by Oliver Lohmann with contributions from Frank Haverkamp, Andreas Arnez, and Artem. Joern Engel contributed a patch which modifies JFFS2 so that it can be run on a UBI volume. Thomas Gleixner did modifications to the NAND layer. Alexander Schmidt made some testing work as well as core functionality improvements. Signed-off-by: Artem B. Bityutskiy <dedekind@linutronix.de> Signed-off-by: Frank Haverkamp <haver@vnet.ibm.com>
* | [MTD][NAND] Add Micron Manufacturer IDsshahrom@micron.com2007-04-17
| | | | | | | | | | | | | | | | Add Micron Manufacturer ID. Signed-off-by: Shahrom Sharif <sshahrom@micron.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* | [MTD] [NOR] Support for auto locking flash on power upRodolfo Giometti2007-04-02
| | | | | | | | | | | | | | | | Auto unlock sectors on resume for auto locking flash on power up. Signed-off-by: Rodolfo Giometti <giometti@enneenne.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* | [MTD] Delete unused header file linux/mtd/iflash.h.Robert P. J. Day2007-03-23
|/ | | | | | | Delete the unreferenced header file include/linux/mtd/iflash.h. Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [MTD] [OneNAND] Classify the page data and oob bufferKyungmin Park2007-03-09
| | | | | | | | Classify the page data and oob buffer and it prevents the memory fragementation (writesize + oobsize) Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [MTD] [NAND] make oobavail publicVitaly Wool2007-03-08
| | | | | | | | | | | During the MTD rework the oobavail parameter of mtd_info structure has become private. This is not quite correct in terms of integrity and logic. If we have means to write to OOB area, then we'd like to know upfront how many bytes out of OOB are spare per page to be able to adapt to specific cases. The patch inlined adds the public oobavail parameter. Signed-off-by: Vitaly Wool <vwool@ru.mvista.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [MTD] Clarify OOB-operation interface commentsArtem Bityutskiy2007-02-09
| | | | | | | | Add more comment to OOB I/O interface. Read/write are not symmetric which is confusing and should be documented. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [MTD] remove unused ecctype,eccsize fields from struct mtd_infoArtem Bityutskiy2007-02-09
| | | | | | | | | | | | Remove unused and broken mtd->ecctype and mtd->eccsize fields from struct mtd_info. Do not remove them from userspace API data structures (don't want to breake userspace) but mark them as obsolete by a comment. Any userspace program which uses them should be half-broken anyway, so this is more about saving data structure size. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [MTD] [NOR] Intel: remove ugly PROGREGION macrosArtem Bityutskiy2007-02-09
| | | | | | | | | | | | Remove ugly and weird MTD_PROGREGION_CTRLMODE_VALID() and MTD_PROGREGION_CTRLMODE_INVALID() macros. There is only one user of them and they are used locally just for printing. Anyway, this patch is a preparation for removing mtd->ecctype and mtd->eccsize, but these macros use them. Fix this. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [MTD] physmap: Add support for 64 bit resourcesStefan Roese2007-02-09
| | | | | | | | | | This patch adds support for 64 bit resources enabled via the CONFIG_RESOURCES_64BIT option. Now a 64 bit can be passed to the physmap driver. Signed-off-by: Stefan Roese <sr@denx.de> Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [MTD] Don't include linux/mtd/map.h from linux/mtd/physmap.hHaavard Skinnemoen2007-02-09
| | | | | | | | | Replace the inclusion of linux/mtd/map.h with a forward-declaration of struct map_info. This allows linux/mtd/physmap.h to be included by e.g. board code even if the MTD subsystem is disabled. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* Merge branch 'master' of git://git.infradead.org/~kmpark/onenand-mtd-2.6David Woodhouse2007-02-09
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| * [MTD] OneNAND: Error message printing and bad block scan errosKyungmin Park2007-02-06
| | | | | | | | | | | | | | | | Provide the bad block scan with its own read function so that important error messages that are not from the the bad block scan, can always be printed. Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
| * [MTD] OneNAND: Reduce internal BufferRAM operationsKyungmin Park2007-02-01
| | | | | | | | | | | | | | | | | | | | It use blockpage instead of a pair (block, page). It can also cover a small chunk access. 0x00, 0x20, 0x40 and so on. And in JFFS2 behavior, sometimes it reads two pages alternatively. e.g., It first reads A page, B page and A page. So we check another bufferram to find requested page. Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
| * [MTD] OneNAND: Remove unused fieldsKyungmin Park2007-01-31
| | | | | | | | | | | | | | - Remove unused fields - Fix typo Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
| * [MTD] OneNAND: Update copyrights and code cleanupKyungmin Park2007-01-17
| | | | | | | | | | | | Update copyrights and code cleanup Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
| * [MTD] OneNAND: Reduce Double Density Package (DDP) operationsKyungmin Park2007-01-17
| | | | | | | | | | | | | | - DDP code clean-up - Reduce block & bufferram operations in DDP Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
* | [MTD] [NAND] Add kernel-doc for cellinfo field of struct nand_chipRandy Dunlap2007-02-09
|/ | | | | | | | Fixes kernel-doc warning in mtd/nand.h. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* [MTD] OneNAND: Implement read-while-loadAdrian Hunter2007-01-10
| | | | | | | Read-while-load enables higher performance read operations. Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
* [MTD] OneNAND: add subpage write supportKyungmin Park2007-01-10
| | | | | | OneNAND supports up to 4 writes at one NAND page. Add support of this feature. Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
* Merge branch 'master' of ↵David Woodhouse2006-12-01
|\ | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
| * [PATCH] MTD: fix last kernel-doc warningRandy Dunlap2006-10-30
| | | | | | | | | | | | | | | | | | | | Fix the last current kernel-doc warning: Warning(/var/linsrc/linux-2619-rc3g5//include/linux/mtd/nand.h:416): No description found for parameter 'write_page' Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* | [MTD] add get and put methodsArtem Bityutskiy2006-11-29
| | | | | | | | | | | | | | | | | | This patch adds get_device() and put_device() methods to the MTD description structure (struct mtd_info). These methods are called by MTD whenever the MTD device is get or put. They are needed when the underlying driver is something smarter then just flash chip driver, for example UBI. Signed-off-by: Artem Bityutskiy <dedekind@infradead.org>
* | [MTD] add get_mtd_device_nm() functionArtem Bityutskiy2006-11-29
| | | | | | | | | | | | | | | | | | This patch adds one more function to the MTD interface to make it possible to open MTD devices by their names, not only numbers. This is very handy in many situations. Also, MTD device number depend on load order and may vary, while names are fixed. Signed-off-by: Artem Bityutskiy <dedekind@infradead.org>
* | [MTD] NAND: add subpage write supportThomas Gleixner2006-11-29
| | | | | | | | | | | | | | Many SLC NANDs support up to 4 writes at one NAND page. Add support of this feature. Signed-off-by: Artem Bityutskiy <dedekind@infradead.org>
* | [MTD] increase MAX_MTD_DEVICESArtem Bityutskiy2006-11-29
| | | | | | | | Signed-off-by: Artem Bityutskiy <dedekind@infradead.org>
* | Merge git://git.infradead.org/~kmpark/onenand-mtd-2.6David Woodhouse2006-11-28
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| * | [MTD] OneNAND: Single bit error detectionKyungmin Park2006-11-15
| | | | | | | | | | | | | | | | | | | | | Idea from Jarkko Lavinen Signed-off-by: Jarkko Lavinen <jarkko.lavinen@nokia.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
| * | [MTD] OneNAND: lock supportKyungmin Park2006-11-15
| | | | | | | | | | | | | | | | | | | | | | | | Now you can use mtd lock inferface on OneNAND The idea is from Nemakal, Vijaya, thanks Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
| * | MTD: OneNAND: interrupt based wait supportKyungmin Park2006-11-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We can use the two methods to wait. 1. polling: read interrupt status register 2. interrupt: use kernel ineterrupt mechanism To use interrupt method, you first connect onenand interrupt pin to your platform and configure interrupt properly Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
* | | [MTD] [NAND] remove len/ooblen confusion.Vitaly Wool2006-11-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As was discussed between Ricard Wanderlöf, David Woodhouse, Artem Bityutskiy and me, the current API for reading/writing OOB is confusing. The thing that introduces confusion is the need to specify ops.len together with ops.ooblen for reads/writes that concern only OOB not data area. So, ops.len is overloaded: when ops.datbuf != NULL it serves to specify the length of the data read, and when ops.datbuf == NULL, it serves to specify the full OOB read length. The patch inlined below is the slightly updated version of the previous patch serving the same purpose, but with the new Artem's comments taken into account. Artem, BTW, thanks a lot for your valuable input! Signed-off-by: Vitaly Wool <vwool@ru.mvista.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
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