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authorDavid Brownell <david-b@pacbell.net>2007-08-08 09:12:54 -0700
committerPierre Ossman <drzeus@drzeus.cx>2007-09-23 22:17:27 +0200
commit15a0580ced081a0f7dc2deea8a4812bdc5e9a109 (patch)
tree8540ae8e0ac8d33cec931276fee1b0bf10435f7c /drivers/mmc/host/Kconfig
parentaf51715079e7fb6b290e1881d63d815dc4de5011 (diff)
downloadblackbird-op-linux-15a0580ced081a0f7dc2deea8a4812bdc5e9a109.tar.gz
blackbird-op-linux-15a0580ced081a0f7dc2deea8a4812bdc5e9a109.zip
mmc_spi host driver
This is the latest version of the MMC-over-SPI support. It works on 2.6.23-rc2 plus git-mmc (from rc1-mm2), along with the preceding patches which teach the rest of the MMC stack about SPI. The main issue of note is that sometimes cards need to be power cycled to recover after certain faults. Also, it may sometimes be necessary to disable CRCs. ("modprobe mmc_core use_spi_crc=n") Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Cc: mikael.starvik@axis.com, Cc: Hans-Peter Nilsson <hp@axis.com> Cc: Jan Nikitenko <jan.nikitenko@gmail.com> Cc: Mike Lavender <mike@steroidmicros.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Diffstat (limited to 'drivers/mmc/host/Kconfig')
-rw-r--r--drivers/mmc/host/Kconfig13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index e23082fe88d0..68fb052afd3e 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -100,3 +100,16 @@ config MMC_TIFM_SD
To compile this driver as a module, choose M here: the
module will be called tifm_sd.
+config MMC_SPI
+ tristate "MMC/SD over SPI (EXPERIMENTAL)"
+ depends on MMC && SPI_MASTER && !HIGHMEM && EXPERIMENTAL
+ select CRC7
+ select CRC_ITU_T
+ help
+ Some systems accss MMC/SD cards using a SPI controller instead of
+ using a "native" MMC/SD controller. This has a disadvantage of
+ being relatively high overhead, but a compensating advantage of
+ working on many systems without dedicated MMC/SD controllers.
+
+ If unsure, or if your system has no SPI master driver, say N.
+
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