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We want to support the internal emmc device on the reform,
which has a different initialization sequence from SDcard.
The problem is, all mmc controller drivers where using
the command index to derive the command properties.
The command index's interpretation depends on the
command set. And MMC has different commands then SD.
Also, there are the APP_CMD escaped commands which
drivers then tried to recover the state...
All of this is total nonsense... The controller drivers
should not care and the command properties should
be maintained by port/sdmmc.c.
So we pass the command as a struct SDiocmd, which
has all the properties (command index, response type,
data transfer mode... and even a string for debugging).
The controller just converts this into register values
and just executes the commands.
Next, the controller drivers shouldnt snoop on the
commands and then try to apply bus and frequency
switching on their own. This is now made explicit by
having SDio.bus(io, width, speed) function.
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remove the global sdio struct and add a addmmcio() function
for drivers to register their controllers.
there is a SDio.aux pointer now where controller drivers
can stash a pointer to their private data.
SDio.init() also can signal that it wants to be called
again for more controllers by returning > 0 (see pc/pmmc.c).
this is in preparation for supporting the internal mmc
device in the mnt-reform which is hooked up to usdhc1.
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for unknown reasons, multiwrite is busted in usdhc:
sdhc: write error intr 10 stat ff88858e
usdhccmd: need to reset Datinhibit intr 10 stat ff88858e
usdhc: cmd 193a0027 arg 1e5b6b error intr 18010 stat ff88858f
i'm disabling it for now, adding a flag to the SDio struct.
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sdbio() tests if it can pass the buffer pointer directly to
the driver when it is already in kernel memory. we also need
to check if the buffer is properly aligned but alignment
requirement is handled in system specific sdmalloc() and
was not known to devsd.
to solve this, we *always* page align sd buffers and get rid
of the system specific sdmalloc() macro (was only used in bcm
kernel).
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