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 --- drivers/mmc/mmc-uclass.c | 13 +++++++++++++ drivers/mmc/mmc.c | 6 ++++++ include/mmc.h | 10 ++++++++++ 3 files changed, 29 insertions(+)
diff --git a/drivers/mmc/mmc-uclass.c b/drivers/mmc/mmc-uclass.c index 5dda20c..9c6a8ba 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 46ec5e1..fd93691 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 e524963..bd096ae 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);