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mmc: export eMMC4.4 enhanced area details to sysfs

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Enhanced area feature is a new feature defined in eMMC4.4 standard. This
user data area provides higher performance/reliability, at the expense
of using twice the effective media space due to the area using SLC.

The MMC driver now reads out the enhanced area offset and size and adds
them to the device attributes in sysfs. Enabling the enhanced area can
only be done once, and should be done in manufacturing. To use this
feature, bit ERASE_GRP_DEF should also be set.

Documentation/ABI/testing/sysfs-devices-mmc describes the two new
attributes.

Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Reviewed-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Chuanxiao Dong
2011-01-22 04:09:41 +08:00
committed by Chris Ball
parent cfd8065246
commit 709de99df0
4 changed files with 101 additions and 0 deletions
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Documentation/ABI/testing/sysfs-devices-mmc
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What: /sys/devices/.../mmc_host/mmcX/mmcX:XXXX/enhanced_area_offset
Date: January 2011
Contact: Chuanxiao Dong <chuanxiao.dong@intel.com>
Description:
Enhanced area is a new feature defined in eMMC4.4 standard.
eMMC4.4 or later card can support such feature. This kind of
area can help to improve the card performance. If the feature
is enabled, this attribute will indicate the start address of
enhanced data area. If not, this attribute will be -EINVAL.
Unit Byte. Format decimal.
What: /sys/devices/.../mmc_host/mmcX/mmcX:XXXX/enhanced_area_size
Date: January 2011
Contact: Chuanxiao Dong <chuanxiao.dong@intel.com>
Description:
Enhanced area is a new feature defined in eMMC4.4 standard.
eMMC4.4 or later card can support such feature. This kind of
area can help to improve the card performance. If the feature
is enabled, this attribute will indicate the size of enhanced
data area. If not, this attribute will be -EINVAL.
Unit KByte. Format decimal.