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mmc: card: Adding support for sanitize in eMMC 4.5

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The sanitize support is added as a user-app ioctl call, and
was removed from the block-device request, since its purpose is
to be invoked not via File-System but by a user.

This feature deletes the unmap memory region of the eMMC card,
by writing to a specific register in the EXT_CSD.

unmap region is the memory region that was previously deleted
(by erase, trim or discard operation).

In order to avoid timeout when sanitizing large-scale cards,
the timeout for sanitize operation is 240 seconds.

Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Maya Erez
2013-04-18 15:41:55 +03:00
committed by Chris Ball
parent b689167984
commit 775a9362b5
6 changed files with 72 additions and 22 deletions
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1
include/linux/mmc/host.h
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@@ -280,6 +280,7 @@ struct mmc_host {
#define MMC_CAP2_PACKED_CMD (MMC_CAP2_PACKED_RD | \
MMC_CAP2_PACKED_WR)
#define MMC_CAP2_NO_PRESCAN_POWERUP (1 << 14) /* Don't power up before scan */
#define MMC_CAP2_SANITIZE (1 << 15) /* Support Sanitize */
mmc_pm_flag_t pm_caps; /* supported pm features */