kernel/linux.git/include/linux/mmc/host.h, branch linux-2.6.22.y

MMC: Fix handling of low-voltage cards

2007-05-01T12:14:50+00:00

Fix handling of low voltage MMC cards. The latest MMC and SD specs both agree that support for low-voltage operations is indicated by bit 7 in the OCR. The MMC spec states that the low voltage range is 1.65-1.95V while the SD spec leaves the actual voltage range undefined - meaning that there is still no such thing as a low voltage SD card. However, an old Sandisk spec implied that bits 7.0 represented voltages below 2.0V in 1V or 0.5V increments, and the code was accordingly written with that expectation. This confusion meant that host drivers attempting to support the typical low voltage (1.8V) would set the wrong bits in the host OCR mask (usually bits 5 and/or 6) resulting in the the low voltage mode never being used. This change corrects the low voltage range and adds sanity checks on the reserved bits (0-6) and for SD cards that claim to support low-voltage operations. Signed-off-by: Philip Langdale Signed-off-by: Pierre Ossman

MMC: Consolidate voltage definitions

2007-05-01T11:42:28+00:00

Consolidate the list of available voltages. Up until now, a separate set of defines has been used for host->vdd than that used for the OCR voltage mask values. Having two sets of defines allows them to get out of sync and the current sets are already inconsistent with one claiming to describe ranges and the other specific voltages. Only the SDHCI driver uses the host->vdd defines and it is easily fixed to use the OCR defines. Signed-off-by: Philip Langdale Signed-off-by: Pierre Ossman

mmc: add bus handler

2007-05-01T11:41:06+00:00

Delegate protocol handling to "bus handlers". This allows the core to just handle the task of arbitrating the bus. Initialisation and pampering of cards is now done by the different bus handlers. This design also allows MMC and SD (and later SDIO) to be more cleanly separated, allowing easier maintenance. Signed-off-by: Pierre Ossman

mmc: Move core functions to subdir

2007-05-01T11:04:18+00:00

Create a "core" subdirectory to house the central bus handling functions. Signed-off-by: Pierre Ossman

mmc: deprecate mmc bus topology

2007-05-01T11:04:18+00:00

The classic MMC bus was defined as multi card bus system, which is reflected in the design in the MMC layer. When SD showed up, the bus topology was abandoned and a star topology (one card per host) was mandated. MMC version 4 has followed this, officially deprecating the bus topology. As we do not have any known users of the bus topology we can remove support for it. This will simplify the code and rectify some incorrect assumptions in the newer additions. Signed-off-by: Pierre Ossman

mmc: Flush pending detects on host removal

2007-05-01T11:04:17+00:00

Make sure we kill of any pending detection runs when the host is removed instead of when it is freed. Also add some debugging to make sure the driver doesn't queue up more detection after it has removed the host. Signed-off-by: Pierre Ossman

mmc: Move OCR bit defines

2007-05-01T11:04:16+00:00

All host drivers were #include:ing mmc/protocol.h just to get access to the OCR bit defines. Move these to host.h instead. Signed-off-by: Pierre Ossman

mmc: require explicit support for high-speed

2007-03-06T12:26:55+00:00

The new high-speed timings are similar to each other and the old system, but not identical. And although things "just work" most of the time, sometimes it does not. So we need to start marking which hosts are known to fully comply with the new timings. Signed-off-by: Pierre Ossman

mmc: Allow host drivers to specify max block count

2007-02-04T19:54:10+00:00

Many controllers have an upper limit on the number of blocks that can be transferred in one request. Allow the host drivers to specify this and make sure we avoid hitting this limit. Also change the max_sectors field to avoid confusion. This makes it map less directly to the block layer limits, but as they didn't apply directly on MMC cards anyway, this isn't a great loss. Signed-off-by: Pierre Ossman

mmc: Allow host drivers to specify a max block size

2007-02-04T19:54:10+00:00

Most controllers have an upper limit on the block size. Allow the host drivers to specify this and make sure we avoid hitting this limit. Signed-off-by: Pierre Ossman