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| author | Tomas Melin <tomas.melin@vaisala.com> | 2016-11-25 09:01:03 (GMT) |
|---|---|---|
| committer | Jaehoon Chung <jh80.chung@samsung.com> | 2016-12-01 02:09:44 (GMT) |
| commit | cd3d48807dfb64f521fcbc30034d4e921d842a5b (patch) | |
| tree | c0b1d7778cefb47b0af8cd5c5e8a42f882102529 /drivers/mmc/mmc.c | |
| parent | f0ecfc5e7e412c2098627cab2133fb2e284edfea (diff) | |
| download | u-boot-cd3d48807dfb64f521fcbc30034d4e921d842a5b.tar.xz | |
mmc: add bkops-enable command
Add new command that provides possibility to enable the
background operations handshake functionality
(BKOPS_EN, EXT_CSD byte [163]) on eMMC devices.
This is an optional feature of eMMCs, the setting is write-once.
The command must be explicitly taken into use with
CONFIG_CMD_BKOPS_ENABLE.
Signed-off-by: Tomas Melin <tomas.melin@vaisala.com>
Diffstat (limited to 'drivers/mmc/mmc.c')
| -rw-r--r-- | drivers/mmc/mmc.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index d6b7e4f..434eb28 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -1817,3 +1817,37 @@ int mmc_initialize(bd_t *bis) mmc_do_preinit(); return 0; } + +#ifdef CONFIG_CMD_BKOPS_ENABLE +int mmc_set_bkops_enable(struct mmc *mmc) +{ + int err; + ALLOC_CACHE_ALIGN_BUFFER(u8, ext_csd, MMC_MAX_BLOCK_LEN); + + err = mmc_send_ext_csd(mmc, ext_csd); + if (err) { + puts("Could not get ext_csd register values\n"); + return err; + } + + if (!(ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1)) { + puts("Background operations not supported on device\n"); + return -EMEDIUMTYPE; + } + + if (ext_csd[EXT_CSD_BKOPS_EN] & 0x1) { + puts("Background operations already enabled\n"); + return 0; + } + + err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BKOPS_EN, 1); + if (err) { + puts("Failed to enable manual background operations\n"); + return err; + } + + puts("Enabled manual background operations\n"); + + return 0; +} +#endif |