hw/sd: Add sdbus_write_data() to write multiples bytes on the data line

Add a sdbus_write_data() method to write multiple bytes on the
data line of a SD bus.
We might improve the tracing later, for now keep logging each
byte individually.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200814092346.21825-5-f4bug@amsat.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/hw/sd/sd.h b/include/hw/sd/sd.h
index 14ffc7f475..3ae3e8939b 100644
--- a/include/hw/sd/sd.h
+++ b/include/hw/sd/sd.h
@@ -175,6 +175,15 @@ void sdbus_write_byte(SDBus *sd, uint8_t value);
  * Return: byte value read
  */
 uint8_t sdbus_read_byte(SDBus *sd);
+/**
+ * Write data to a SD bus.
+ * @sdbus: bus
+ * @buf: data to write
+ * @length: number of bytes to write
+ *
+ * Write multiple bytes of data on the data lines of a SD bus.
+ */
+void sdbus_write_data(SDBus *sdbus, const void *buf, size_t length);
 bool sdbus_data_ready(SDBus *sd);
 bool sdbus_get_inserted(SDBus *sd);
 bool sdbus_get_readonly(SDBus *sd);