Let's not attempt the abolition of mtd->type until/unless it's properly
thought through. And certainly, let's not do it by halves.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Ram devices get the extra capability of MTD_NO_ERASE - not requiring
an explicit erase before writing to it. Currently only mtdblock uses
this capability. Rest of the patch is a simple text replacement.
Signed-off-by: Joern Engel <joern@wh.fh-wedel.de>
No mtd user should ever check for the device type. Instead, device features
should be checked by the flags - if at all.
As a first step towards type removal, change MTD_ROM into MTD_GENERIC_TYPE.
Signed-off-by: Joern Engel <joern@wh.fh-wedel.de>
o Add a flag MTD_BIT_WRITEABLE for devices that allow single bits to be
cleared.
o Replace MTD_PROGRAM_REGIONS with a cleared MTD_BIT_WRITEABLE flag for
STMicro and Intel Sibley flashes with internal ECC. Those flashes
disallow clearing of single bits, unlike regular NOR flashes, so the
new flag models their behaviour better.
o Remove MTD_ECC. After the STMicro/Sibley merge, this flag is only set
and never checked.
Signed-off-by: Joern Engel <joern@wh.fh-wedel.de>
In 2002, STMicro started producing NOR flashes with internal ECC protection
for small blocks (8 or 16 bytes). Support for those flashes was added by me.
In 2005, Intel Sibley flashes copied this strategy and Nico added support for
those. Merge the code for both.
Signed-off-by: Joern Engel <joern@wh.fh-wedel.de>
At least two flashes exists that have the concept of a minimum write unit,
similar to NAND pages, but no other NAND characteristics. Therefore, rename
the minimum write unit to "writesize" for all flashes, including NAND.
Signed-off-by: Joern Engel <joern@wh.fh-wedel.de>
This allows for much better abstraction and separation of the XIP and
non-XIP cases with their own specific implementations. This fixes the
case where a timeout was tripped on in the XIP case by the code that
was meant for the non-XIP case only.
This also makes for a nice code reduction.
Signed-off-by: Nicolas Pitre <nico@cam.org>
CC: "Alexey, Korolev" <alexey.korolev@intel.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
The patch below fixes a potential starvation issue that can arise when
there is contention on a chip during a period when a process is
currently writing to it. The starvation is avoided by conditionally
rescheduling when the chip is left in a state usable by other processes.
Signed-off-by: Josh Boyer <jdub@us.ibm.com>
Signed-off-by: Tom Gall <tom_gall@vnet.ibm.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
We used to calculate the number of chips to be zero, allocate an array
of that size, then nasty things would happen when we attempt to access
the first object in that zero-sized array.
Now, if the number of _full_ chips that would fit into the map is zero,
we allocate an array of one anyway, and then artificially reduce the
total size of the resulting MTD device to fit in the map.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Remove the obsolete Kconfig options MTD_CFI_AMDSTD_RETRY
and MTD_CFI_AMDSTD_RETRY_MAX
The code that depended on these was removed in early 2004, but
Kconfig was not updated accordingly.
Signed-off-by: Anders Larsen <al@alarsen.net>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
This adds flash chip used in Sharp Zaurus sl5500 (collie) to jedec_probe.
Values work for read-only access, but I have not figured out how to do
read-write.
Signed-off-by: Pavel Machek <pavel@suse.cz>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Acked-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
- chips/sharp.c: make two needlessly global functions static
- move some declarations to a header file where they belong to
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Acked-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Fix a kernel oops for Intel P30 flashes, where the wait queue head was not
initialized for the flchip struct, which in turn caused a crash at the
first read operation.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
I found an issue in cfi_cmdset0001.c. It is related to cache region
invalidation in the buffered write procedure.
The code performs cache invalidation from "cmd_addr" to "cmd_adr + len" in
do_write_buffer() while we modify region from "adr" to "adr+len".
This issue affects writes + reads of data by small chunks.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
