diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index badf702..43480eb 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -67,6 +67,7 @@
 	unsigned int		type;		/* card type */
 #define MMC_TYPE_MMC		0		/* MMC card */
 #define MMC_TYPE_SD		1		/* SD card */
+#define MMC_TYPE_SDIO		2		/* SDIO card */
 	unsigned int		state;		/* (our) card state */
 #define MMC_STATE_PRESENT	(1<<0)		/* present in sysfs */
 #define MMC_STATE_READONLY	(1<<1)		/* card is read-only */
@@ -84,6 +85,7 @@
 
 #define mmc_card_mmc(c)		((c)->type == MMC_TYPE_MMC)
 #define mmc_card_sd(c)		((c)->type == MMC_TYPE_SD)
+#define mmc_card_sdio(c)	((c)->type == MMC_TYPE_SDIO)
 
 #define mmc_card_present(c)	((c)->state & MMC_STATE_PRESENT)
 #define mmc_card_readonly(c)	((c)->state & MMC_STATE_READONLY)
diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index 29c98ae..8faa436 100644
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -41,6 +41,7 @@
 #define MMC_RSP_R1B	(MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE|MMC_RSP_BUSY)
 #define MMC_RSP_R2	(MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC)
 #define MMC_RSP_R3	(MMC_RSP_PRESENT)
+#define MMC_RSP_R4	(MMC_RSP_PRESENT)
 #define MMC_RSP_R6	(MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
 #define MMC_RSP_R7	(MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
 
diff --git a/include/linux/mmc/sdio.h b/include/linux/mmc/sdio.h
new file mode 100644
index 0000000..d1a0b15
--- /dev/null
+++ b/include/linux/mmc/sdio.h
@@ -0,0 +1,19 @@
+/*
+ *  include/linux/mmc/sdio.h
+ *
+ *  Copyright 2006-2007 Pierre Ossman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ */
+
+#ifndef MMC_SDIO_H
+#define MMC_SDIO_H
+
+/* SDIO commands                         type  argument     response */
+#define SD_IO_SEND_OP_COND          5 /* bcr  [23:0] OCR         R4  */
+
+#endif
+