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author | Ulf Hansson <ulf.hansson@linaro.org> | 2014-11-28 14:38:36 +0100 |
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committer | Ulf Hansson <ulf.hansson@linaro.org> | 2015-01-28 12:31:12 +0100 |
commit | 3aa8793f751d4cfcaca886e75ab30dfb00cf1d88 (patch) | |
tree | 21b63b12191ec9a41f231c7234d43843f98e147f /drivers/mmc/core/host.c | |
parent | c25d9e1bda2316aa0d2bb61640ab4fbe01feb590 (diff) | |
download | linux-3aa8793f751d4cfcaca886e75ab30dfb00cf1d88.tar.gz linux-3aa8793f751d4cfcaca886e75ab30dfb00cf1d88.tar.bz2 linux-3aa8793f751d4cfcaca886e75ab30dfb00cf1d88.zip |
mmc: core: Initial support for MMC power sequences
System on chip designs may specify a specific MMC power sequence. To
successfully detect an (e)MMC/SD/SDIO card, that power sequence must
be followed while initializing the card.
To be able to handle these SOC specific power sequences, let's add a
MMC power sequence interface. It provides the following functions to
help the mmc core to deal with these power sequences.
mmc_pwrseq_alloc() - Invoked from mmc_of_parse(), to initialize data.
mmc_pwrseq_pre_power_on()- Invoked in the beginning of mmc_power_up().
mmc_pwrseq_post_power_on()- Invoked at the end in mmc_power_up().
mmc_pwrseq_power_off()- Invoked from mmc_power_off().
mmc_pwrseq_free() - Invoked from mmc_free_host(), to free data.
Each MMC power sequence provider will be responsible to implement a set
of callbacks. These callbacks mirrors the functions above.
This patch adds the skeleton, following patches will extend the core of
the MMC power sequence and add support for a specific simple MMC power
sequence.
Do note, since the mmc_pwrseq_alloc() is invoked from mmc_of_parse(),
host drivers needs to make use of this API to enable the support for
MMC power sequences. Moreover the MMC power sequence support depends on
CONFIG_OF.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Diffstat (limited to 'drivers/mmc/core/host.c')
-rw-r--r-- | drivers/mmc/core/host.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c index 07636449b4de..8be0df758e68 100644 --- a/drivers/mmc/core/host.c +++ b/drivers/mmc/core/host.c @@ -30,6 +30,7 @@ #include "core.h" #include "host.h" #include "slot-gpio.h" +#include "pwrseq.h" #define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev) @@ -448,7 +449,7 @@ int mmc_of_parse(struct mmc_host *host) host->dsr_req = 0; } - return 0; + return mmc_pwrseq_alloc(host); } EXPORT_SYMBOL(mmc_of_parse); @@ -588,6 +589,7 @@ EXPORT_SYMBOL(mmc_remove_host); */ void mmc_free_host(struct mmc_host *host) { + mmc_pwrseq_free(host); put_device(&host->class_dev); } |