[PATCH V4 6/7] mmc: add bcm2835 driver
swarren at wwwdotorg.org
Tue Nov 27 11:32:27 EST 2012
On 11/26/2012 11:49 PM, Albert ARIBAUD wrote:
> 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.
Do feel free to apply all the patches before the MMC driver addition
without waiting for the MMC driver though.
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