[PATCH 13/22] hw/sd: Introduce receive_ready() callback

[Bin Meng]

From: Bin Meng <bin.meng@windriver.com>

At present there is a data_ready() callback for the SD data read
path. Let's add a receive_ready() for the SD data write path.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
---

 include/hw/sd/sd.h |  2 ++
 hw/sd/core.c       | 13 +++++++++++++
 hw/sd/sd.c         |  6 ++++++
 3 files changed, 21 insertions(+)

diff --git a/include/hw/sd/sd.h b/include/hw/sd/sd.h
index 05ef9b73e5..47360ba4ee 100644
--- a/include/hw/sd/sd.h
+++ b/include/hw/sd/sd.h
@@ -116,6 +116,7 @@ struct SDCardClass {
      * Return: byte value read
      */
     uint8_t (*read_byte)(SDState *sd);
+    bool (*receive_ready)(SDState *sd);
     bool (*data_ready)(SDState *sd);
     void (*set_voltage)(SDState *sd, uint16_t millivolts);
     uint8_t (*get_dat_lines)(SDState *sd);
@@ -187,6 +188,7 @@ void sdbus_write_data(SDBus *sdbus, const void *buf, size_t 
length);
  * Read multiple bytes of data on the data lines of a SD bus.
  */
 void sdbus_read_data(SDBus *sdbus, void *buf, size_t length);
+bool sdbus_receive_ready(SDBus *sd);
 bool sdbus_data_ready(SDBus *sd);
 bool sdbus_get_inserted(SDBus *sd);
 bool sdbus_get_readonly(SDBus *sd);
diff --git a/hw/sd/core.c b/hw/sd/core.c
index 08c93b5903..30ee62c510 100644
--- a/hw/sd/core.c
+++ b/hw/sd/core.c
@@ -160,6 +160,19 @@ void sdbus_read_data(SDBus *sdbus, void *buf, size_t 
length)
     }
 }
 
+bool sdbus_receive_ready(SDBus *sdbus)
+{
+    SDState *card = get_card(sdbus);
+
+    if (card) {
+        SDCardClass *sc = SD_CARD_GET_CLASS(card);
+
+        return sc->receive_ready(card);
+    }
+
+    return false;
+}
+
 bool sdbus_data_ready(SDBus *sdbus)
 {
     SDState *card = get_card(sdbus);
diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index 67e5f7c05d..f19e38625a 100644
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -2036,6 +2036,11 @@ uint8_t sd_read_byte(SDState *sd)
     return ret;
 }
 
+static bool sd_receive_ready(SDState *sd)
+{
+    return sd->state == sd_receivingdata_state;
+}
+
 static bool sd_data_ready(SDState *sd)
 {
     return sd->state == sd_sendingdata_state;
@@ -2147,6 +2152,7 @@ static void sd_class_init(ObjectClass *klass, void *data)
     sc->do_command = sd_do_command;
     sc->write_byte = sd_write_byte;
     sc->read_byte = sd_read_byte;
+    sc->receive_ready = sd_receive_ready;
     sc->data_ready = sd_data_ready;
     sc->enable = sd_enable;
     sc->get_inserted = sd_get_inserted;
-- 
2.25.1