[PATCH V4 6/7] mmc: add bcm2835 driver

Albert ARIBAUD albert.u.boot at aribaud.net
Tue Nov 27 01:49:08 EST 2012

On Mon, 26 Nov 2012 21:38:16 -0700, Stephen Warren
<swarren at wwwdotorg.org> wrote:

> This adds a simple driver for the BCM2835's SD controller.
> Workarounds are implemented for:
> * Register writes can't be too close to each-other in time, or they will
>   be lost.
> * Register accesses must all be 32-bit, so implement custom accessors.
> This code was extracted from:
> git://github.com/gonzoua/u-boot-pi.git master
> which was created by Oleksandr Tymoshenko.
> Portions of the code there were obviously based on the Linux kernel at:
> git://github.com/raspberrypi/linux.git rpi-3.6.y
> commit f5b930b "Main bcm2708 linux port" signed-off-by Dom Cobley.
> swarren changed the following for upstream:
> * Removed hack udelay()s in bcm2835_sdhci_raw_writel(); setting
>   SDHCI_QUIRK_WAIT_SEND_CMD appears to solve the issues.
> * Remove register logging from read*/write* functions.
> * Sort out confusion with min/max_freq values passed to add_sdhci().
> * Use more descriptive variable names and calculations in IO accessors.
> * Simplified and commented twoticks_delay calculation.
> * checkpatch fixes.
> Cc: Andy Fleming <afleming at gmail.com>

Hi Andy,

As soon as you give your Ack to this patch, I'll apply the
whole series to u-boot-arm/master.


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