linux-toradex.git/drivers/mtd/chips/gen_probe.c, branch v3.0.74

mtd: cfi_cmdset_0002: use AMD standard command-set with Winbond flash chips

2010-05-20T15:57:00+00:00

Tested with W19L320SBT9C [1].

[1] http://www.datasheetarchive.com/pdf-datasheets/Datasheets-40/DSA-795343.pdf

[dwmw2: Fix MODULE_ALIAS and linkage]
Signed-off-by: Obinou 
Signed-off-by: Guillaume LECERF 
Acked-by: Florian Fainelli 
Signed-off-by: David Woodhouse

mtd: cfi_cmdset_0002: add CFI detection for SST 39VF{16, 32}xx chips

2010-05-14T00:39:23+00:00

SST 39VF{16,32}xx chips use the 0x0701 command set, fully compatible
with the AMD one. This patch adds support for detecting them in CFI
mode.

Signed-off-by: Guillaume LECERF 
Reviewed-by: Wolfram Sang 
Signed-off-by: David Woodhouse

mtd: cfi_probe: use P_ID_* definitions instead of hardcoded values

2010-05-14T00:08:19+00:00

Use P_ID_* definitions already in include/linux/mtd/cfi.h instead of the
hardcoded values. Make the code more readable.

Signed-off-by: Guillaume LECERF 
Reviewed-by: Wolfram Sang 
Signed-off-by: David Woodhouse

mtd: fix a huge latency problem in the MTD CFI and LPDDR flash drivers.

2010-05-10T13:22:30+00:00

The use of a memcpy() during a spinlock operation will cause very long
thread context switch delays if the flash chip bandwidth is low and the
data to be copied large, because a spinlock will disable preemption.

For example: A flash with 6,5 MB/s bandwidth will cause under ubifs,
which request sometimes 128 KiB (the flash erase size), a preemption delay of
20 milliseconds. High priority threads will not be served during this
time, regardless whether this threads access the flash or not. This behavior
breaks real time.

The patch changes all the use of spin_lock operations for xxxx->mutex
into mutex operations, which is exact what the name says and means.

I have checked the code of the drivers and there is no use of atomic
pathes like interrupt or timers. The mtdoops facility will also not be used
by this drivers. So it is dave to replace the spin_lock against mutex.

There is no performance regression since the mutex is normally not
acquired.

Changelog:
 06.03.2010 First release
 26.03.2010 Fix mutex[1] issue and tested it for compile failure

Signed-off-by: Stefani Seibold 
Signed-off-by: Artem Bityutskiy 
Signed-off-by: David Woodhouse

[MTD] Use DIV_ROUND_UP

2008-08-02T17:45:18+00:00

The kernel.h macro DIV_ROUND_UP performs the computation (((n) + (d) - 1) /
(d)) but is perhaps more readable.

Signed-off-by: Julia Lawall 
Signed-off-by: David Woodhouse

[MTD] [NOR] gen_probe: No debug message when debugging is disabled

2008-07-11T17:23:11+00:00

Use pr_debug(...) instead of printk(KERN_DEBUG ...) so that the message
is only printed when debugging is enabled.

Signed-off-by: Jean Delvare 
Tested-by: John stoffel 
Signed-off-by: David Woodhouse

MTD/JFFS2: remove CVS keywords

2008-06-04T16:50:17+00:00

Once upon a time, the MTD repository was using CVS.

This patch therefore removes all usages of the no longer updated CVS
keywords from the MTD code.

This also includes code that printed them to the user.

Signed-off-by: Adrian Bunk 
Signed-off-by: David Woodhouse

[MTD] [NOR] fix startup lock when using multiple nor flash chips

2008-02-07T10:38:12+00:00

Taken from http://bugzilla.kernel.org/show_bug.cgi?id=9829

I found and solved the problem, at line 115 of drivers/mtd/chips/gen_probe.c
(kernel 2.6.24): mapsize value must be calculated in bytes, not in long.

Signed-off-by: Andrew Morton 
Signed-off-by: David Woodhouse

[MTD] Remove trailing whitespace

2006-11-30T08:17:38+00:00

The newly-added cafe_ecc.c had a lot of it because of the way the lookup
table was auto-generated; clean up the other files too while we're at it.

Signed-off-by: David Woodhouse

[MTD] replace kmalloc+memset with kzalloc

2006-11-28T23:47:21+00:00

Signed-off-by: Yan Burman 
Signed-off-by: David Woodhouse