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| author | Jean-Jacques Hiblot <jjhiblot@ti.com> | 2017-09-21 16:30:01 +0200 |
|---|---|---|
| committer | Jaehoon Chung <jh80.chung@samsung.com> | 2018-01-12 18:11:04 +0900 |
| commit | 318a7a576bc49aa8b4207e694d3fbd48c663d6ac (patch) | |
| tree | b693aae78287dc6ad3eb069d6a4308266187bff1 | |
| parent | aff5d3c83fb8c294b3c4b97c5b6386306b47f1a0 (diff) | |
| download | u-boot-318a7a576bc49aa8b4207e694d3fbd48c663d6ac.tar.gz u-boot-318a7a576bc49aa8b4207e694d3fbd48c663d6ac.tar.bz2 u-boot-318a7a576bc49aa8b4207e694d3fbd48c663d6ac.zip | |
mmc: Add a new callback function to perform the 74 clocks cycle sequence
Add a new callback function *send_init_stream* which start a sequence of
at least 74 clock cycles.
The mmc core uses *mmc_send_init_stream* in order to invoke the callback
function. This will be used during power cycle where the specification
requires such a sequence after power up.
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
| -rw-r--r-- | drivers/mmc/mmc-uclass.c | 13 | ||||
| -rw-r--r-- | drivers/mmc/mmc.c | 6 | ||||
| -rw-r--r-- | include/mmc.h | 10 |
3 files changed, 29 insertions, 0 deletions
diff --git a/drivers/mmc/mmc-uclass.c b/drivers/mmc/mmc-uclass.c index 5dda20cda5..9c6a8ba476 100644 --- a/drivers/mmc/mmc-uclass.c +++ b/drivers/mmc/mmc-uclass.c @@ -51,6 +51,19 @@ int mmc_set_ios(struct mmc *mmc) return dm_mmc_set_ios(mmc->dev); } +void dm_mmc_send_init_stream(struct udevice *dev) +{ + struct dm_mmc_ops *ops = mmc_get_ops(dev); + + if (ops->send_init_stream) + ops->send_init_stream(dev); +} + +void mmc_send_init_stream(struct mmc *mmc) +{ + dm_mmc_send_init_stream(mmc->dev); +} + int dm_mmc_get_wp(struct udevice *dev) { struct dm_mmc_ops *ops = mmc_get_ops(dev); diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index 24b5e16a3b..1875b31ad1 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -1198,6 +1198,10 @@ static inline int bus_width(uint cap) } #if !CONFIG_IS_ENABLED(DM_MMC) +static void mmc_send_init_stream(struct mmc *mmc) +{ +} + static int mmc_set_ios(struct mmc *mmc) { int ret = 0; @@ -1983,6 +1987,8 @@ int mmc_start_init(struct mmc *mmc) mmc_set_bus_width(mmc, 1); mmc_set_clock(mmc, 1); + mmc_send_init_stream(mmc); + /* Reset the Card */ err = mmc_go_idle(mmc); diff --git a/include/mmc.h b/include/mmc.h index e5249637c8..bd096aeb21 100644 --- a/include/mmc.h +++ b/include/mmc.h @@ -361,6 +361,14 @@ struct dm_mmc_ops { int (*set_ios)(struct udevice *dev); /** + * send_init_stream() - send the initialization stream: 74 clock cycles + * This is used after power up before sending the first command + * + * @dev: Device to update + */ + void (*send_init_stream)(struct udevice *dev); + + /** * get_cd() - See whether a card is present * * @dev: Device to check @@ -382,11 +390,13 @@ struct dm_mmc_ops { int dm_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd, struct mmc_data *data); int dm_mmc_set_ios(struct udevice *dev); +void dm_mmc_send_init_stream(struct udevice *dev); int dm_mmc_get_cd(struct udevice *dev); int dm_mmc_get_wp(struct udevice *dev); /* Transition functions for compatibility */ int mmc_set_ios(struct mmc *mmc); +void mmc_send_init_stream(struct mmc *mmc); int mmc_getcd(struct mmc *mmc); int mmc_getwp(struct mmc *mmc); |