[PATCH] MMC/SD SPI-mode driver

[Patrick Kelsey]

On Sat, Mar 10, 2012 at 9:13 PM, Patrick Kelsey <kelsey at ieee.org> wrote:

> There are two .diff files attached to this message.  The first is an
> MMC/SD SPI-mode driver (mmcspi) that implements the existing mmc/sd
> bridge interface and talks to the spibus interface (the latter with a
> few modifications).  The second is the changes to the ar71xx_spi
> driver that I made to support the mmcspi driver.  I developed these
> patches using a MikroTik RB450G and tested it with 31 different
> microSD cards.
>
> Change details for mmcspi.diff:
>
> Existing mmc/sd stack:
> - Added concept of bus type (bus_type_sd vs. bus_type_spi)
> - Fixed some typos
> - Fixed some math errors in csd decode
> - Fixed bad lookup table
> - Fixed bad arg to mmc_send_app_op_cond() during probe
> - Added setting of block length on card
> - Added detection (and skipping) of password-locked cards
> - Avoid card select and bus timing commands when bus type is bus_type_spi
> - Added new command flag MMC_CMD_IS_APP to annotate ACMD_x commands
>
> Existing spibus interface:
> - Incorporated Luiz Otavio O Souza's acquire/release/write patch
> - Added configuration methods
> - Added flag to allow transactions with chip select high (needed for
>  proper sd card init)
>
>
> Change details for ar71xx_spi.diff
> - Incorporated Luiz Otavio O Souza's patch implementing his changes to
> spibus_if
> - Added configuration methods and clock setting support
>
>

I updated the patches to apply cleanly against -HEAD (r234999) and removed
a lookup table bug fix in mmc.c that has since been fixed separately.

-Patrick
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