1
linux/arch
Haavard Skinnemoen 7d2be0749a atmel-mci: Driver for Atmel on-chip MMC controllers
This is a driver for the MMC controller on the AP7000 chips from
Atmel. It should in theory work on AT91 systems too with some
tweaking, but since the DMA interface is quite different, it's not
entirely clear if it's worth merging this with the at91_mci driver.

This driver has been around for a while in BSPs and kernel sources
provided by Atmel, but this particular version uses the generic DMA
Engine framework (with the slave extensions) instead of an
avr32-only DMA controller framework.

This driver can also use PIO transfers when no DMA channels are
available, and for transfers where using DMA may be difficult or
impractical for some reason (e.g. the DMA setup overhead is usually
not worth it for very short transfers, and badly aligned buffers or
lengths are difficult to handle.)

Currently, the driver only support PIO transfers. DMA support has been
split out to a separate patch to hopefully make it easier to review.

The driver has been tested using mmc-block and ext3fs on several SD,
SDHC and MMC+ cards. Reads and writes work fine, with read transfer
rates up to 3.5 MiB/s on fast cards with debugging disabled.

The driver has also been tested using the mmc_test module on the same
cards. All tests except 7, 9, 15 and 17 succeed. The first two are
unsupported by all the cards I have, so I don't know if the driver
handles this correctly. The last two fail because the hardware flags a
Data CRC Error instead of a Data Timeout error. I'm not sure how to deal
with that.

Documentation for this controller can be found in many data sheets from
Atmel, including the AT32AP7000 data sheet which can be found here:

http://www.atmel.com/dyn/products/datasheets.asp?family_id=682

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2008-07-15 14:14:49 +02:00
..
alpha Alpha Linux kernel fails with inconsistent kallsyms data 2008-07-04 10:40:09 -07:00
arm Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2008-07-14 16:06:58 -07:00
avr32 atmel-mci: Driver for Atmel on-chip MMC controllers 2008-07-15 14:14:49 +02:00
blackfin Merge commit 'v2.6.26' into bkl-removal 2008-07-14 15:29:34 -06:00
cris Merge commit 'v2.6.26' into bkl-removal 2008-07-14 15:29:34 -06:00
frv Fix various old email addresses for dwmw2 2008-06-06 11:29:10 -07:00
h8300 [PATCH] take init_files to fs/file.c 2008-05-16 17:22:20 -04:00
ia64 [IA64] export account_system_vtime 2008-06-30 15:06:48 -07:00
m32r [PATCH] take init_files to fs/file.c 2008-05-16 17:22:20 -04:00
m68k Merge commit 'v2.6.26' into bkl-removal 2008-07-14 15:29:34 -06:00
m68knommu m68knommu: init coldfire timer TRR with n - 1, not n 2008-06-12 18:05:40 -07:00
mips Merge commit 'v2.6.26' into bkl-removal 2008-07-14 15:29:34 -06:00
mn10300 mn10300: provide __ucmpdi2() for MN10300 2008-07-04 10:40:07 -07:00
parisc Merge branch 'core/rodata' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-14 15:28:10 -07:00
powerpc Merge branch 'core/rodata' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-14 15:28:10 -07:00
ppc [POWERPC] Export empty_zero_page and copy_page in arch/ppc 2008-05-31 17:08:28 +10:00
s390 Merge branch 'core/rodata' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-14 15:28:10 -07:00
sh Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2008-07-14 16:06:58 -07:00
sparc Merge commit 'v2.6.26' into bkl-removal 2008-07-14 15:29:34 -06:00
sparc64 Merge branch 'tracing/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-14 14:49:54 -07:00
um Merge commit 'v2.6.26' into bkl-removal 2008-07-14 15:29:34 -06:00
v850 [PATCH] take init_files to fs/file.c 2008-05-16 17:22:20 -04:00
x86 Merge branch 'for-2.6.27' of git://git.infradead.org/users/dwmw2/firmware-2.6 2008-07-14 16:54:07 -07:00
xtensa [PATCH] take init_files to fs/file.c 2008-05-16 17:22:20 -04:00
.gitignore
Kconfig