Commit Graph

26876 Commits

Author SHA1 Message Date
Thomas Gleixner
7abd3ef987 [MTD] Refactor NAND hwcontrol to cmd_ctrl
The hwcontrol function enforced a step by step state machine
for any kind of hardware chip access. Let the hardware driver
know which control bits are set and inform it about a change
of the control lines. Let the hardware driver write out the
command and address bytes directly. This gives a peformance
advantage for address bus controlled chips and simplifies the
quirks in the hardware drivers.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-23 23:25:53 +02:00
Thomas Gleixner
3821720d51 [MTD] Export nand_write_raw
The previous _ecc removal / cleanup broke (i)nftl module usage.
Export the missing symbol.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-23 22:33:52 +02:00
Thomas Gleixner
85b85fee0c [MTD] Mark NAND drivers TOTO and PPChameleon broken
Both drivers can not be fixed and compiled due to missing header files.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-23 22:03:39 +02:00
Thomas Gleixner
9223a456da [MTD] Remove read/write _ecc variants
MTD clients are agnostic of FLASH which needs ECC suppport.
Remove the functions and fixup the callers.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-23 17:21:03 +02:00
Thomas Gleixner
2528e8cdf3 [MTD] Remove readv/readv_ecc
These functions were never implemented and added only bloat to
partition and concat code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-23 16:10:00 +02:00
Thomas Gleixner
9d8522df37 [MTD] Remove nand writev support
NAND writev(_ecc) support is not longer necessary. Remove it.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-23 16:06:03 +02:00
Thomas Gleixner
0cddd6c258 [MTD] ECC rework broke diskonchip
Fix the diskonchip ecc setup.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-23 15:59:58 +02:00
Thomas Gleixner
9a57d470fd [MTD] NAND ECC hwctl function has no return value
Fix the broken prototype

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-23 15:58:23 +02:00
Thomas Gleixner
4cbb9b80e1 Merge branch 'master' of /home/tglx/work/kernel/git/mtd-2.6/
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-23 12:37:31 +02:00
Thomas Gleixner
6dfc6d250d [MTD] NAND modularize ECC
First step of modularizing ECC support.
- Move ECC related functionality into a seperate embedded data structure
- Get rid of the hardware dependend constants to simplify new ECC models

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-23 12:00:46 +02:00
Thomas Gleixner
7aa65bfd67 [MTD] NAND cleanup nand_scan
Seperate functionality out of nand_scan so the code is more
readable. No functional change. First step of simplifying
the nand driver.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-23 11:54:38 +02:00
Thomas Gleixner
58dd8f2bfd [MTD] NAND consolidate data types
The NAND driver used a mix of unsigned char, u_char amd uint8_t
data types. Consolidate to uint8_t usage

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-23 11:52:35 +02:00
Thomas Gleixner
2c0a2bed92 [MTD] NAND whitespace and formatting cleanup
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-23 11:50:56 +02:00
Thomas Gleixner
dcb0932884 [JFFS2] Simplify writebuffer handling
The writev based write buffer implementation was far to complex as
in most use cases the write buffer had to be handled anyway.
Simplify the write buffer handling and use mtd->write instead.

From extensive testing no performance impact has been noted.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-23 11:49:14 +02:00
Thomas Gleixner
ce4c61f184 [MTD] Add support for NDFC NAND controller
NDFC NAND Flash controller is embedded in PPC EP44x SoCs.
Add platform driver based support.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-23 11:43:28 +02:00
Thomas Gleixner
41796c2ea9 [MTD] Add platform support for NAND
Add the data structures necessary to provide platform device support
for NAND

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-23 11:38:59 +02:00
Thomas Gleixner
a36ed2995c [MTD] Simplify NAND locking
Replace the chip lock by a the controller lock. For simple drivers a
dummy controller structure is created by the scan code.
This simplifies the locking algorithm in nand_get/release_chip().

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-23 11:37:03 +02:00
Thomas Gleixner
819d6a32c3 [MTD] Improve software ECC calculation
Unrolling the loops produces denser and much faster code.
Add a config switch which allows to select the byte order of the
resulting ecc code. The current Linux implementation has a byte
swap versus the SmartMedia specification

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2006-05-23 11:32:45 +02:00
David Woodhouse
9fe4854cd1 [JFFS2] Remove flash offset argument from various functions.
We don't need the upper layers to deal with the physical offset. It's
_always_ c->nextblock->offset + c->sector_size - c->nextblock->free_size
so we might as well just let the actual write functions deal with that.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-23 00:38:06 +01:00
Joern Engel
5fa433942b [MTD] Introduce MTD_BIT_WRITEABLE
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>
2006-05-22 23:18:29 +02:00
Joern Engel
c8b229de2b [MTD] Merge STMicro NOR_ECC code with Intel Sibley code
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>
2006-05-22 23:18:12 +02:00
Joern Engel
28318776a8 [MTD] Introduce writesize
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>
2006-05-22 23:18:05 +02:00
Joern Engel
8ca9ed5db3 [MTD] Use single flag to mark writeable devices.
Two flags exist to decide whether a device is writeable or not.  None of
those two flags is checked for independently, so they are clearly redundant,
if not an invitation to bugs.  This patch removed both of them, replacing
them with a single new flag.

Signed-off-by: Joern Engel <joern@wh.fh-wedel.de>
2006-05-22 23:17:23 +02:00
David Woodhouse
987d47b71a [JFFS2] Put list of nodes in common part of ic/x_ref/x_datum structure
We'll be using a proper list of nodes in the jffs2_xattr_datum and
jffs2_xattr_ref structures, because the existing code to overwrite
them is just broken. Put it in the common part at the front of the
structure which is shared with the jffs2_inode_cache, so that the
jffs2_link_node_ref() function can do the right thing.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-22 16:32:05 +01:00
David Woodhouse
0eac940b8a [JFFS2] Add some preemptive BUG checks for XATTR code
In a couple of places, we assume that what's at the end of the
->next_in_ino list is a struct jffs2_inode_cache. Let's check
for that, since we expect it to change soon.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-22 16:29:23 +01:00
David Woodhouse
fcb7578719 [JFFS2] Extend jffs2_link_node_ref() to link into per-inode list too.
Let's avoid the potential for forgetting to set ref->next_in_ino, by doing
it within jffs2_link_node_ref() instead.

This highlights the ugliness of what we're currently doing with
xattr_datum and xattr_ref structures -- we should find a nicer way of
dealing with that.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-22 15:23:10 +01:00
David Woodhouse
a1b563d652 [JFFS2] Initialise ref->next_in_ino when marking dirty space in wbuf flush
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-22 13:55:46 +01:00
David Woodhouse
3b79673cfa [JFFS2] Fix accounting error in jffs2_link_node_ref()
When filing REF_OBSOLETE nodes, we'd add their size to the global
'dirty_size' count, but then to the eraseblock's 'used_size' count.
That's not clever.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-22 12:15:47 +01:00
David Woodhouse
06c6764b58 [JFFS2] Fix dummy jffs2_sum_scan_sumnode() macro for !SUMMARY case.
I added an argument to the real function...

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-22 11:27:14 +01:00
David Woodhouse
0d25971d7c Merge git://git.infradead.org/jffs2-devel-2.6 2006-05-21 19:05:55 +01:00
David Woodhouse
615191bb1d [MTD] Account for MODULE_SYMBOL_PREFIX when requesting NOR chip driver
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-21 19:03:21 +01:00
David Woodhouse
ecde263130 [MTD] Use symbol_request() in old DiskOnChip probe code to find actual driver
The previous code wouldn't work correctly on architectures which have a
non-empty MODULE_SYMBOL_PREFIX, and this version is neater if slightly
less optimal in the built-in case.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-21 18:38:51 +01:00
Jonathan McDowell
3d12c0c75d [MTD] Add Amstrad Delta NAND support
The patch below adds support for the NAND device on the Amstrad Delta.
This is a 32MiB 8bit Toshiba device, with the data bus connected to the
OMAP MPUIO pins and ALE, CLE, NCE, NRE, NWE and NWP all connected to the
Delta's latch2 16bit latch.

Signed-Off-By: Jonathan McDowell <noodles@earth.li>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-21 18:11:55 +01:00
David Woodhouse
ca89a517fa [JFFS2] Finally eliminate __totlen field from struct jffs2_raw_node_ref
Well, almost. We'll actually keep a 'TEST_TOTLEN' macro set for now, and keep
doing some paranoia checks to make sure it's all working correctly. But if
TEST_TOTLEN is unset, the size of struct jffs2_raw_node_ref drops from 16
bytes to 12 on 32-bit machines. That's a saving of about half a megabyte of
memory on the OLPC prototype board, with 125K or so nodes in its 512MiB of
flash.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-21 13:29:11 +01:00
David Woodhouse
010b06d6d0 [JFFS2] Locking issues in summary write code.
We can't use jffs2_scan_dirty_space() because it doesn't do any locking; it's
only for use at scan time -- hence the 'scan' in the name.

Also, don't allocate refs while we have c->erase_completion_lock held.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-21 13:15:59 +01:00
David Woodhouse
9167e0f811 [JFFS2] Remove stray kfree of summary info in XATTR code.
We don't allocate this locally any more -- it's given to us and owner by
our caller. Also improve the debug messages a little.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-21 13:13:45 +01:00
David Woodhouse
0bcc099d6d [JFFS2] File node reference for wasted space when flushing wbuf
Next step in ongoing campaign to file a struct jffs2_raw_node_ref for every
piece of dirty space in the system, so that __totlen can be killed off....

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-21 13:00:54 +01:00
David Woodhouse
b64335f2b7 [JFFS2] Add length argument to jffs2_add_physical_node_ref()
If __totlen is going away, we need to pass the length in separately.
Also stop callers from needlessly setting ref->next_phys to NULL,
since that's done for them... and since that'll also be going away soon.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-21 04:36:45 +01:00
David Woodhouse
49f11d4075 [JFFS2] Mark gaps in summary list as dirty space
Make sure we allocate a ref for any dirty space which exists between nodes
which we find in an eraseblock summary.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-21 04:00:01 +01:00
David Woodhouse
25090a6b23 [JFFS2] Discard remaining free space when filing a dirty block in scan.
The incoming ref_totlen() calculation is going to rely on the existence
of nodes which cover all dirty space. We can't just tweak the accounting
data any more; we have to call jffs2_scan_dirty_space() to do it.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-21 03:57:56 +01:00
David Woodhouse
68270995f2 [JFFS2] Introduce jffs2_scan_dirty_space() function.
To eliminate the __totlen field from struct jffs2_raw_node_ref, we need
to allocate nodes for dirty space instead of just tweaking the accounting
data. Introduce jffs2_scan_dirty_space() in preparation for that.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-21 03:46:05 +01:00
David Woodhouse
7807ef7ba2 [JFFS2] Fix summary handling of unknown but compatible nodes.
For RWCOMPAT and ROCOMPAT nodes, we should still allow the mount to
succeed. Just abandon the summary and fall through to the full scan.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-21 03:45:27 +01:00
David Woodhouse
3560160aa2 [JFFS2] Fix memory leak in scan code; improve comments.
If we had to allocate extra space for the summary node, we weren't
correctly freeing it when jffs2_sum_scan_sumnode() returned nonzero --
which is both the success and the failure case. Only when it returned
zero, which means fall through to the full scan, were we correctly freeing
the buffer.

Document the meaning of those return codes while we're at it.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-21 01:28:05 +01:00
David Woodhouse
6171586a7a [JFFS2] Correct handling of JFFS2_FEATURE_RWCOMPAT_COPY nodes.
We should preserve these when we come to garbage collect them, not let
them get erased. Use jffs2_garbage_collect_pristine() for this, and make
sure the summary code copes -- just refrain from writing a summary for any
block which contains a node we don't understand.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-21 00:02:06 +01:00
David Woodhouse
fb9fbbcc93 [JFFS2] Correct accounting of erroneous cleanmarkers and failed summaries.
It should all be counted as dirty space, not wasted and _definitely_ not
unchecked.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-20 20:08:42 +01:00
David Woodhouse
f1f9671bd8 [JFFS2] Introduce jffs2_link_node_ref() function to reduce code duplication
The same sequence of code was repeated in many places, to add a new
struct jffs2_raw_node_ref to an eraseblock and adjust the space accounting
accordingly. Move it out-of-line.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-20 19:45:26 +01:00
David Woodhouse
0cfc7da3ff Merge git://git.infradead.org/jffs2-xattr-2.6
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-20 17:27:32 +01:00
David Woodhouse
1417fc44ee [JFFS2] Reduce calls to ref_totlen() in jffs2_mark_node_obsolete()
We were calling ref_totlen() 18 times. Even before that becomes a real
function rather than just a dereference, apparently some compilers still
suck anyway. It'll _certainly_ suck after ref_totlen() becomes more
complicated, so calculate it once and don't rely on CSE.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-20 16:20:19 +01:00
David Woodhouse
9641b784ff [JFFS2] Optimise reading of eraseblock summary nodes
This improves the time to mount 512MiB of NAND flash on my OLPC prototype
by about 4%. We used to read the last page of the eraseblock twice -- once
to find the offset of the summary node, and again to actually _read_ the
summary node. Now we read the last page only once, and read more only if
we need to.

We also don't allocate a new buffer just for the summary code -- we use
the buffer which was already allocated for the scan. Better still, if the
'buffer' for the scan is actually just a pointer directly into NOR flash,
we use that too, avoiding the memcpy() which we used to do.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-20 16:13:34 +01:00
Andrew Morton
6c8b44abc8 [MTD] Avoid 64-bit division in mtdconcat
WARNING: "__moddi3" [drivers/mtd/mtdconcat.ko] undefined!

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-20 10:17:21 +01:00