[03/20] sdcard: Rename the SDRequest as SDFrame48

Commit Message

Philippe Mathieu-Daudé May 4, 2018, 3:59 p.m. UTC

SD requests are 48-bit SD frames, while SD responses can be
48-bit or 136-bit frames. The 48-bit response frames share
the same CRC logic than request frames.
Unify the 48-bit framing to reuse the same CRC logic between
requests and responses.

Signed-off-by: Philippe Mathieu-Daudé <[e-mail]>
---
 include/hw/sd/sd.h | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

Patch

diff --git a/include/hw/sd/sd.h b/include/hw/sd/sd.h
index 9bdb3c9285..f0b41232f7 100644
--- a/include/hw/sd/sd.h
+++ b/include/hw/sd/sd.h
@@ -76,11 +76,22 @@  typedef enum {
     sd_adtc,	/* addressed with data transfer */
 } sd_cmd_type_t;
 
-typedef struct {
+/**
+ * SDFrame48: 48 bits commands or responses
+ *
+ * @cmd: request:  command
+ *       response: mirrored command
+ * @arg: request:  address information or parameter
+ *       response: status information, OCR register, RCA
+ * @crc: 7-bit CRC checksum
+ */
+typedef struct SDFrame48 {
     uint8_t cmd;
     uint32_t arg;
     uint8_t crc;
-} SDRequest;
+} SDFrame48;
+
+typedef struct SDFrame48 SDRequest;
 
 typedef struct SDState SDState;
 typedef struct SDBus SDBus;