diff options
author | Ulf Hansson <ulf.hansson@linaro.org> | 2014-11-28 14:38:36 +0100 |
---|---|---|
committer | Ulf Hansson <ulf.hansson@linaro.org> | 2015-01-28 12:31:12 +0100 |
commit | 3aa8793f751d4cfcaca886e75ab30dfb00cf1d88 (patch) | |
tree | 21b63b12191ec9a41f231c7234d43843f98e147f /drivers/mmc/core/core.c | |
parent | c25d9e1bda2316aa0d2bb61640ab4fbe01feb590 (diff) | |
download | op-kernel-dev-3aa8793f751d4cfcaca886e75ab30dfb00cf1d88.zip op-kernel-dev-3aa8793f751d4cfcaca886e75ab30dfb00cf1d88.tar.gz |
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/core.c')
-rw-r--r-- | drivers/mmc/core/core.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index d5c176e..1be7055 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -40,6 +40,7 @@ #include "bus.h" #include "host.h" #include "sdio_bus.h" +#include "pwrseq.h" #include "mmc_ops.h" #include "sd_ops.h" @@ -1615,6 +1616,8 @@ void mmc_power_up(struct mmc_host *host, u32 ocr) mmc_host_clk_hold(host); + mmc_pwrseq_pre_power_on(host); + host->ios.vdd = fls(ocr) - 1; host->ios.power_mode = MMC_POWER_UP; /* Set initial state and call mmc_set_ios */ @@ -1645,6 +1648,8 @@ void mmc_power_up(struct mmc_host *host, u32 ocr) */ mmc_delay(10); + mmc_pwrseq_post_power_on(host); + mmc_host_clk_release(host); } @@ -1655,6 +1660,8 @@ void mmc_power_off(struct mmc_host *host) mmc_host_clk_hold(host); + mmc_pwrseq_power_off(host); + host->ios.clock = 0; host->ios.vdd = 0; |