Provide a new function sdbus_reparent_card() in sd core for reparenting
a card from a SDBus to another one.
This function is required by the raspi platform, where the two SD
controllers can be dynamically switched.
Signed-off-by: Clement Deschamps <clement.descha...@antfield.fr>
---
hw/sd/core.c | 30 ++++++++++++++++++++++++++++++
include/hw/sd/sd.h | 1 +
2 files changed, 31 insertions(+)
diff --git a/hw/sd/core.c b/hw/sd/core.c
index 14c2bdf27b..a8f24f505f 100644
--- a/hw/sd/core.c
+++ b/hw/sd/core.c
@@ -131,6 +131,36 @@ void sdbus_set_readonly(SDBus *sdbus, bool readonly)
}
}
+void sdbus_reparent_card(SDBus *from, SDBus *to)
+{
+ BusChild *kid = QTAILQ_FIRST(&from->qbus.children);
+ SDState *card;
+ SDCardClass *sc;
+ bool readonly;
+
+ /* We directly reparent the card object rather than implementing this
+ * as a hotpluggable connection because we don't want to expose SD cards
+ * to users as being hotpluggable, and we can get away with it in this
+ * limited use case. This could perhaps be implemented more cleanly in
+ * future by adding support to the hotplug infrastructure for "device
+ * can be hotplugged only via code, not by user".
+ */
+
+ if (!kid) {
+ return;
+ }
+
+ card = SD_CARD(kid->child);
+ sc = SD_CARD_GET_CLASS(card);
+ readonly = sc->get_readonly(card);
+
+ sdbus_set_inserted(from, false);
+ object_unparent(OBJECT(kid));
+ qdev_set_parent_bus(DEVICE(card), &to->qbus);
+ sdbus_set_inserted(to, true);
+ sdbus_set_readonly(to, readonly);
+}
+
static const TypeInfo sd_bus_info = {
.name = TYPE_SD_BUS,
.parent = TYPE_BUS,
diff --git a/include/hw/sd/sd.h b/include/hw/sd/sd.h
index 79909b2478..54eaf9b554 100644
--- a/include/hw/sd/sd.h
+++ b/include/hw/sd/sd.h
@@ -140,6 +140,7 @@ uint8_t sdbus_read_data(SDBus *sd);
bool sdbus_data_ready(SDBus *sd);
bool sdbus_get_inserted(SDBus *sd);
bool sdbus_get_readonly(SDBus *sd);
+void sdbus_reparent_card(SDBus *from, SDBus *to);
/* Functions to be used by SD devices to report back to qdevified controllers
*/
void sdbus_set_inserted(SDBus *sd, bool inserted);
--
2.11.1
