floppy: add references to 82077's extra registers

This controller provides extra status registers SRA and SRB as well
as a tape drive register (TDR) and a data rate select register (DSR),
which are referenced in the sparc port, so let's have their symbolic
definitions centralized.

Link: https://lore.kernel.org/r/20200331094054.24441-3-w@1wt.eu
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Denis Efremov <efremov@linux.com>

diff --git a/include/uapi/linux/fdreg.h b/include/uapi/linux/fdreg.h
index 1318881..10d3363 100644 (file)
--- a/include/uapi/linux/fdreg.h
+++ b/include/uapi/linux/fdreg.h
@@ -7,13 +7,23 @@
  * Handbook", Sanches and Canton.
  */
 
-/* Fd controller regs. S&C, about page 340 */
-#define FD_STATUS      4
-#define FD_DATA                5
+/* 82077's auxiliary status registers A & B (R) */
+#define FD_SRA         0
+#define FD_SRB         1
 
 /* Digital Output Register */
 #define FD_DOR         2
 
+/* 82077's tape drive register (R/W) */
+#define FD_TDR         3
+
+/* 82077's data rate select register (W) */
+#define FD_DSR         4
+
+/* Fd controller regs. S&C, about page 340 */
+#define FD_STATUS      4
+#define FD_DATA                5
+
 /* Digital Input Register (read) */
 #define FD_DIR         7