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>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/drivers/mmc/mmc-uclass.c b/drivers/mmc/mmc-uclass.c
index 9af84da..2f4dc5b 100644
--- a/drivers/mmc/mmc-uclass.c
+++ b/drivers/mmc/mmc-uclass.c
@@ -83,6 +83,19 @@
return dm_mmc_wait_dat0(mmc->dev, state, timeout_us);
}
+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);
+}
+
static 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 13e887e..cdcf2e0 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -1663,6 +1663,10 @@
}
#endif
+static void mmc_send_init_stream(struct mmc *mmc)
+{
+}
+
static int mmc_set_ios(struct mmc *mmc)
{
int ret = 0;
@@ -2929,6 +2933,8 @@
retry:
mmc_set_initial_state(mmc);
+ mmc_send_init_stream(mmc);
+
/* Reset the Card */
err = mmc_go_idle(mmc);
diff --git a/include/mmc.h b/include/mmc.h
index 52cacfd..eead666 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -494,6 +494,14 @@
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
@@ -572,6 +580,7 @@
/* 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);
int mmc_execute_tuning(struct mmc *mmc, uint opcode);